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 51 #include <trace/events/sunrpc.h> 52 53 #include "sunrpc.h" 54 55 static void xs_close(struct rpc_xprt *xprt); 56 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 57 struct socket *sock); 58 59 /* 60 * xprtsock tunables 61 */ 62 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 63 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 64 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 65 66 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 67 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 68 69 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 70 71 #define XS_TCP_LINGER_TO (15U * HZ) 72 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 73 74 /* 75 * We can register our own files under /proc/sys/sunrpc by 76 * calling register_sysctl_table() again. The files in that 77 * directory become the union of all files registered there. 78 * 79 * We simply need to make sure that we don't collide with 80 * someone else's file names! 81 */ 82 83 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 84 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 85 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 86 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 87 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 88 89 static struct ctl_table_header *sunrpc_table_header; 90 91 /* 92 * FIXME: changing the UDP slot table size should also resize the UDP 93 * socket buffers for existing UDP transports 94 */ 95 static struct ctl_table xs_tunables_table[] = { 96 { 97 .procname = "udp_slot_table_entries", 98 .data = &xprt_udp_slot_table_entries, 99 .maxlen = sizeof(unsigned int), 100 .mode = 0644, 101 .proc_handler = proc_dointvec_minmax, 102 .extra1 = &min_slot_table_size, 103 .extra2 = &max_slot_table_size 104 }, 105 { 106 .procname = "tcp_slot_table_entries", 107 .data = &xprt_tcp_slot_table_entries, 108 .maxlen = sizeof(unsigned int), 109 .mode = 0644, 110 .proc_handler = proc_dointvec_minmax, 111 .extra1 = &min_slot_table_size, 112 .extra2 = &max_slot_table_size 113 }, 114 { 115 .procname = "tcp_max_slot_table_entries", 116 .data = &xprt_max_tcp_slot_table_entries, 117 .maxlen = sizeof(unsigned int), 118 .mode = 0644, 119 .proc_handler = proc_dointvec_minmax, 120 .extra1 = &min_slot_table_size, 121 .extra2 = &max_tcp_slot_table_limit 122 }, 123 { 124 .procname = "min_resvport", 125 .data = &xprt_min_resvport, 126 .maxlen = sizeof(unsigned int), 127 .mode = 0644, 128 .proc_handler = proc_dointvec_minmax, 129 .extra1 = &xprt_min_resvport_limit, 130 .extra2 = &xprt_max_resvport 131 }, 132 { 133 .procname = "max_resvport", 134 .data = &xprt_max_resvport, 135 .maxlen = sizeof(unsigned int), 136 .mode = 0644, 137 .proc_handler = proc_dointvec_minmax, 138 .extra1 = &xprt_min_resvport, 139 .extra2 = &xprt_max_resvport_limit 140 }, 141 { 142 .procname = "tcp_fin_timeout", 143 .data = &xs_tcp_fin_timeout, 144 .maxlen = sizeof(xs_tcp_fin_timeout), 145 .mode = 0644, 146 .proc_handler = proc_dointvec_jiffies, 147 }, 148 { }, 149 }; 150 151 static struct ctl_table sunrpc_table[] = { 152 { 153 .procname = "sunrpc", 154 .mode = 0555, 155 .child = xs_tunables_table 156 }, 157 { }, 158 }; 159 160 #endif 161 162 /* 163 * Wait duration for a reply from the RPC portmapper. 164 */ 165 #define XS_BIND_TO (60U * HZ) 166 167 /* 168 * Delay if a UDP socket connect error occurs. This is most likely some 169 * kind of resource problem on the local host. 170 */ 171 #define XS_UDP_REEST_TO (2U * HZ) 172 173 /* 174 * The reestablish timeout allows clients to delay for a bit before attempting 175 * to reconnect to a server that just dropped our connection. 176 * 177 * We implement an exponential backoff when trying to reestablish a TCP 178 * transport connection with the server. Some servers like to drop a TCP 179 * connection when they are overworked, so we start with a short timeout and 180 * increase over time if the server is down or not responding. 181 */ 182 #define XS_TCP_INIT_REEST_TO (3U * HZ) 183 184 /* 185 * TCP idle timeout; client drops the transport socket if it is idle 186 * for this long. Note that we also timeout UDP sockets to prevent 187 * holding port numbers when there is no RPC traffic. 188 */ 189 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 190 191 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 192 # undef RPC_DEBUG_DATA 193 # define RPCDBG_FACILITY RPCDBG_TRANS 194 #endif 195 196 #ifdef RPC_DEBUG_DATA 197 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 198 { 199 u8 *buf = (u8 *) packet; 200 int j; 201 202 dprintk("RPC: %s\n", msg); 203 for (j = 0; j < count && j < 128; j += 4) { 204 if (!(j & 31)) { 205 if (j) 206 dprintk("\n"); 207 dprintk("0x%04x ", j); 208 } 209 dprintk("%02x%02x%02x%02x ", 210 buf[j], buf[j+1], buf[j+2], buf[j+3]); 211 } 212 dprintk("\n"); 213 } 214 #else 215 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 216 { 217 /* NOP */ 218 } 219 #endif 220 221 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 222 { 223 return (struct rpc_xprt *) sk->sk_user_data; 224 } 225 226 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 227 { 228 return (struct sockaddr *) &xprt->addr; 229 } 230 231 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 232 { 233 return (struct sockaddr_un *) &xprt->addr; 234 } 235 236 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 237 { 238 return (struct sockaddr_in *) &xprt->addr; 239 } 240 241 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 242 { 243 return (struct sockaddr_in6 *) &xprt->addr; 244 } 245 246 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 247 { 248 struct sockaddr *sap = xs_addr(xprt); 249 struct sockaddr_in6 *sin6; 250 struct sockaddr_in *sin; 251 struct sockaddr_un *sun; 252 char buf[128]; 253 254 switch (sap->sa_family) { 255 case AF_LOCAL: 256 sun = xs_addr_un(xprt); 257 strlcpy(buf, sun->sun_path, sizeof(buf)); 258 xprt->address_strings[RPC_DISPLAY_ADDR] = 259 kstrdup(buf, GFP_KERNEL); 260 break; 261 case AF_INET: 262 (void)rpc_ntop(sap, buf, sizeof(buf)); 263 xprt->address_strings[RPC_DISPLAY_ADDR] = 264 kstrdup(buf, GFP_KERNEL); 265 sin = xs_addr_in(xprt); 266 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 267 break; 268 case AF_INET6: 269 (void)rpc_ntop(sap, buf, sizeof(buf)); 270 xprt->address_strings[RPC_DISPLAY_ADDR] = 271 kstrdup(buf, GFP_KERNEL); 272 sin6 = xs_addr_in6(xprt); 273 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 274 break; 275 default: 276 BUG(); 277 } 278 279 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 280 } 281 282 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 283 { 284 struct sockaddr *sap = xs_addr(xprt); 285 char buf[128]; 286 287 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 288 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 289 290 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 291 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 292 } 293 294 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 295 const char *protocol, 296 const char *netid) 297 { 298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 299 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 300 xs_format_common_peer_addresses(xprt); 301 xs_format_common_peer_ports(xprt); 302 } 303 304 static void xs_update_peer_port(struct rpc_xprt *xprt) 305 { 306 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 307 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 308 309 xs_format_common_peer_ports(xprt); 310 } 311 312 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 313 { 314 unsigned int i; 315 316 for (i = 0; i < RPC_DISPLAY_MAX; i++) 317 switch (i) { 318 case RPC_DISPLAY_PROTO: 319 case RPC_DISPLAY_NETID: 320 continue; 321 default: 322 kfree(xprt->address_strings[i]); 323 } 324 } 325 326 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 327 328 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 329 { 330 struct msghdr msg = { 331 .msg_name = addr, 332 .msg_namelen = addrlen, 333 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 334 }; 335 struct kvec iov = { 336 .iov_base = vec->iov_base + base, 337 .iov_len = vec->iov_len - base, 338 }; 339 340 if (iov.iov_len != 0) 341 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 342 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 343 } 344 345 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p) 346 { 347 ssize_t (*do_sendpage)(struct socket *sock, struct page *page, 348 int offset, size_t size, int flags); 349 struct page **ppage; 350 unsigned int remainder; 351 int err; 352 353 remainder = xdr->page_len - base; 354 base += xdr->page_base; 355 ppage = xdr->pages + (base >> PAGE_SHIFT); 356 base &= ~PAGE_MASK; 357 do_sendpage = sock->ops->sendpage; 358 if (!zerocopy) 359 do_sendpage = sock_no_sendpage; 360 for(;;) { 361 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 362 int flags = XS_SENDMSG_FLAGS; 363 364 remainder -= len; 365 if (more) 366 flags |= MSG_MORE; 367 if (remainder != 0) 368 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE; 369 err = do_sendpage(sock, *ppage, base, len, flags); 370 if (remainder == 0 || err != len) 371 break; 372 *sent_p += err; 373 ppage++; 374 base = 0; 375 } 376 if (err > 0) { 377 *sent_p += err; 378 err = 0; 379 } 380 return err; 381 } 382 383 /** 384 * xs_sendpages - write pages directly to a socket 385 * @sock: socket to send on 386 * @addr: UDP only -- address of destination 387 * @addrlen: UDP only -- length of destination address 388 * @xdr: buffer containing this request 389 * @base: starting position in the buffer 390 * @zerocopy: true if it is safe to use sendpage() 391 * @sent_p: return the total number of bytes successfully queued for sending 392 * 393 */ 394 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p) 395 { 396 unsigned int remainder = xdr->len - base; 397 int err = 0; 398 int sent = 0; 399 400 if (unlikely(!sock)) 401 return -ENOTSOCK; 402 403 if (base != 0) { 404 addr = NULL; 405 addrlen = 0; 406 } 407 408 if (base < xdr->head[0].iov_len || addr != NULL) { 409 unsigned int len = xdr->head[0].iov_len - base; 410 remainder -= len; 411 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 412 if (remainder == 0 || err != len) 413 goto out; 414 *sent_p += err; 415 base = 0; 416 } else 417 base -= xdr->head[0].iov_len; 418 419 if (base < xdr->page_len) { 420 unsigned int len = xdr->page_len - base; 421 remainder -= len; 422 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent); 423 *sent_p += sent; 424 if (remainder == 0 || sent != len) 425 goto out; 426 base = 0; 427 } else 428 base -= xdr->page_len; 429 430 if (base >= xdr->tail[0].iov_len) 431 return 0; 432 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 433 out: 434 if (err > 0) { 435 *sent_p += err; 436 err = 0; 437 } 438 return err; 439 } 440 441 static void xs_nospace_callback(struct rpc_task *task) 442 { 443 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 444 445 transport->inet->sk_write_pending--; 446 } 447 448 /** 449 * xs_nospace - place task on wait queue if transmit was incomplete 450 * @task: task to put to sleep 451 * 452 */ 453 static int xs_nospace(struct rpc_task *task) 454 { 455 struct rpc_rqst *req = task->tk_rqstp; 456 struct rpc_xprt *xprt = req->rq_xprt; 457 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 458 struct sock *sk = transport->inet; 459 int ret = -EAGAIN; 460 461 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 462 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 463 req->rq_slen); 464 465 /* Protect against races with write_space */ 466 spin_lock_bh(&xprt->transport_lock); 467 468 /* Don't race with disconnect */ 469 if (xprt_connected(xprt)) { 470 /* wait for more buffer space */ 471 sk->sk_write_pending++; 472 xprt_wait_for_buffer_space(task, xs_nospace_callback); 473 } else 474 ret = -ENOTCONN; 475 476 spin_unlock_bh(&xprt->transport_lock); 477 478 /* Race breaker in case memory is freed before above code is called */ 479 if (ret == -EAGAIN) { 480 struct socket_wq *wq; 481 482 rcu_read_lock(); 483 wq = rcu_dereference(sk->sk_wq); 484 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags); 485 rcu_read_unlock(); 486 487 sk->sk_write_space(sk); 488 } 489 return ret; 490 } 491 492 /* 493 * Construct a stream transport record marker in @buf. 494 */ 495 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 496 { 497 u32 reclen = buf->len - sizeof(rpc_fraghdr); 498 rpc_fraghdr *base = buf->head[0].iov_base; 499 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 500 } 501 502 /** 503 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 504 * @task: RPC task that manages the state of an RPC request 505 * 506 * Return values: 507 * 0: The request has been sent 508 * EAGAIN: The socket was blocked, please call again later to 509 * complete the request 510 * ENOTCONN: Caller needs to invoke connect logic then call again 511 * other: Some other error occured, the request was not sent 512 */ 513 static int xs_local_send_request(struct rpc_task *task) 514 { 515 struct rpc_rqst *req = task->tk_rqstp; 516 struct rpc_xprt *xprt = req->rq_xprt; 517 struct sock_xprt *transport = 518 container_of(xprt, struct sock_xprt, xprt); 519 struct xdr_buf *xdr = &req->rq_snd_buf; 520 int status; 521 int sent = 0; 522 523 xs_encode_stream_record_marker(&req->rq_snd_buf); 524 525 xs_pktdump("packet data:", 526 req->rq_svec->iov_base, req->rq_svec->iov_len); 527 528 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent, 529 true, &sent); 530 dprintk("RPC: %s(%u) = %d\n", 531 __func__, xdr->len - req->rq_bytes_sent, status); 532 533 if (status == -EAGAIN && sock_writeable(transport->inet)) 534 status = -ENOBUFS; 535 536 if (likely(sent > 0) || status == 0) { 537 req->rq_bytes_sent += sent; 538 req->rq_xmit_bytes_sent += sent; 539 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 540 req->rq_bytes_sent = 0; 541 return 0; 542 } 543 status = -EAGAIN; 544 } 545 546 switch (status) { 547 case -ENOBUFS: 548 break; 549 case -EAGAIN: 550 status = xs_nospace(task); 551 break; 552 default: 553 dprintk("RPC: sendmsg returned unrecognized error %d\n", 554 -status); 555 /* fall through */ 556 case -EPIPE: 557 xs_close(xprt); 558 status = -ENOTCONN; 559 } 560 561 return status; 562 } 563 564 /** 565 * xs_udp_send_request - write an RPC request to a UDP socket 566 * @task: address of RPC task that manages the state of an RPC request 567 * 568 * Return values: 569 * 0: The request has been sent 570 * EAGAIN: The socket was blocked, please call again later to 571 * complete the request 572 * ENOTCONN: Caller needs to invoke connect logic then call again 573 * other: Some other error occurred, the request was not sent 574 */ 575 static int xs_udp_send_request(struct rpc_task *task) 576 { 577 struct rpc_rqst *req = task->tk_rqstp; 578 struct rpc_xprt *xprt = req->rq_xprt; 579 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 580 struct xdr_buf *xdr = &req->rq_snd_buf; 581 int sent = 0; 582 int status; 583 584 xs_pktdump("packet data:", 585 req->rq_svec->iov_base, 586 req->rq_svec->iov_len); 587 588 if (!xprt_bound(xprt)) 589 return -ENOTCONN; 590 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, 591 xdr, req->rq_bytes_sent, true, &sent); 592 593 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 594 xdr->len - req->rq_bytes_sent, status); 595 596 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 597 if (status == -EPERM) 598 goto process_status; 599 600 if (status == -EAGAIN && sock_writeable(transport->inet)) 601 status = -ENOBUFS; 602 603 if (sent > 0 || status == 0) { 604 req->rq_xmit_bytes_sent += sent; 605 if (sent >= req->rq_slen) 606 return 0; 607 /* Still some bytes left; set up for a retry later. */ 608 status = -EAGAIN; 609 } 610 611 process_status: 612 switch (status) { 613 case -ENOTSOCK: 614 status = -ENOTCONN; 615 /* Should we call xs_close() here? */ 616 break; 617 case -EAGAIN: 618 status = xs_nospace(task); 619 break; 620 case -ENETUNREACH: 621 case -ENOBUFS: 622 case -EPIPE: 623 case -ECONNREFUSED: 624 case -EPERM: 625 /* When the server has died, an ICMP port unreachable message 626 * prompts ECONNREFUSED. */ 627 break; 628 default: 629 dprintk("RPC: sendmsg returned unrecognized error %d\n", 630 -status); 631 } 632 633 return status; 634 } 635 636 /** 637 * xs_tcp_send_request - write an RPC request to a TCP socket 638 * @task: address of RPC task that manages the state of an RPC request 639 * 640 * Return values: 641 * 0: The request has been sent 642 * EAGAIN: The socket was blocked, please call again later to 643 * complete the request 644 * ENOTCONN: Caller needs to invoke connect logic then call again 645 * other: Some other error occurred, the request was not sent 646 * 647 * XXX: In the case of soft timeouts, should we eventually give up 648 * if sendmsg is not able to make progress? 649 */ 650 static int xs_tcp_send_request(struct rpc_task *task) 651 { 652 struct rpc_rqst *req = task->tk_rqstp; 653 struct rpc_xprt *xprt = req->rq_xprt; 654 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 655 struct xdr_buf *xdr = &req->rq_snd_buf; 656 bool zerocopy = true; 657 bool vm_wait = false; 658 int status; 659 int sent; 660 661 xs_encode_stream_record_marker(&req->rq_snd_buf); 662 663 xs_pktdump("packet data:", 664 req->rq_svec->iov_base, 665 req->rq_svec->iov_len); 666 /* Don't use zero copy if this is a resend. If the RPC call 667 * completes while the socket holds a reference to the pages, 668 * then we may end up resending corrupted data. 669 */ 670 if (task->tk_flags & RPC_TASK_SENT) 671 zerocopy = false; 672 673 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) 674 xs_tcp_set_socket_timeouts(xprt, transport->sock); 675 676 /* Continue transmitting the packet/record. We must be careful 677 * to cope with writespace callbacks arriving _after_ we have 678 * called sendmsg(). */ 679 while (1) { 680 sent = 0; 681 status = xs_sendpages(transport->sock, NULL, 0, xdr, 682 req->rq_bytes_sent, zerocopy, &sent); 683 684 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 685 xdr->len - req->rq_bytes_sent, status); 686 687 /* If we've sent the entire packet, immediately 688 * reset the count of bytes sent. */ 689 req->rq_bytes_sent += sent; 690 req->rq_xmit_bytes_sent += sent; 691 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 692 req->rq_bytes_sent = 0; 693 return 0; 694 } 695 696 WARN_ON_ONCE(sent == 0 && status == 0); 697 698 if (status == -EAGAIN ) { 699 /* 700 * Return EAGAIN if we're sure we're hitting the 701 * socket send buffer limits. 702 */ 703 if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) 704 break; 705 /* 706 * Did we hit a memory allocation failure? 707 */ 708 if (sent == 0) { 709 status = -ENOBUFS; 710 if (vm_wait) 711 break; 712 /* Retry, knowing now that we're below the 713 * socket send buffer limit 714 */ 715 vm_wait = true; 716 } 717 continue; 718 } 719 if (status < 0) 720 break; 721 vm_wait = false; 722 } 723 724 switch (status) { 725 case -ENOTSOCK: 726 status = -ENOTCONN; 727 /* Should we call xs_close() here? */ 728 break; 729 case -EAGAIN: 730 status = xs_nospace(task); 731 break; 732 case -ECONNRESET: 733 case -ECONNREFUSED: 734 case -ENOTCONN: 735 case -EADDRINUSE: 736 case -ENOBUFS: 737 case -EPIPE: 738 break; 739 default: 740 dprintk("RPC: sendmsg returned unrecognized error %d\n", 741 -status); 742 } 743 744 return status; 745 } 746 747 /** 748 * xs_tcp_release_xprt - clean up after a tcp transmission 749 * @xprt: transport 750 * @task: rpc task 751 * 752 * This cleans up if an error causes us to abort the transmission of a request. 753 * In this case, the socket may need to be reset in order to avoid confusing 754 * the server. 755 */ 756 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 757 { 758 struct rpc_rqst *req; 759 760 if (task != xprt->snd_task) 761 return; 762 if (task == NULL) 763 goto out_release; 764 req = task->tk_rqstp; 765 if (req == NULL) 766 goto out_release; 767 if (req->rq_bytes_sent == 0) 768 goto out_release; 769 if (req->rq_bytes_sent == req->rq_snd_buf.len) 770 goto out_release; 771 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 772 out_release: 773 xprt_release_xprt(xprt, task); 774 } 775 776 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 777 { 778 transport->old_data_ready = sk->sk_data_ready; 779 transport->old_state_change = sk->sk_state_change; 780 transport->old_write_space = sk->sk_write_space; 781 transport->old_error_report = sk->sk_error_report; 782 } 783 784 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 785 { 786 sk->sk_data_ready = transport->old_data_ready; 787 sk->sk_state_change = transport->old_state_change; 788 sk->sk_write_space = transport->old_write_space; 789 sk->sk_error_report = transport->old_error_report; 790 } 791 792 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 793 { 794 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 795 796 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 797 } 798 799 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 800 { 801 smp_mb__before_atomic(); 802 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 803 clear_bit(XPRT_CLOSING, &xprt->state); 804 xs_sock_reset_state_flags(xprt); 805 smp_mb__after_atomic(); 806 } 807 808 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 809 { 810 xs_sock_reset_connection_flags(xprt); 811 /* Mark transport as closed and wake up all pending tasks */ 812 xprt_disconnect_done(xprt); 813 } 814 815 /** 816 * xs_error_report - callback to handle TCP socket state errors 817 * @sk: socket 818 * 819 * Note: we don't call sock_error() since there may be a rpc_task 820 * using the socket, and so we don't want to clear sk->sk_err. 821 */ 822 static void xs_error_report(struct sock *sk) 823 { 824 struct rpc_xprt *xprt; 825 int err; 826 827 read_lock_bh(&sk->sk_callback_lock); 828 if (!(xprt = xprt_from_sock(sk))) 829 goto out; 830 831 err = -sk->sk_err; 832 if (err == 0) 833 goto out; 834 /* Is this a reset event? */ 835 if (sk->sk_state == TCP_CLOSE) 836 xs_sock_mark_closed(xprt); 837 dprintk("RPC: xs_error_report client %p, error=%d...\n", 838 xprt, -err); 839 trace_rpc_socket_error(xprt, sk->sk_socket, err); 840 xprt_wake_pending_tasks(xprt, err); 841 out: 842 read_unlock_bh(&sk->sk_callback_lock); 843 } 844 845 static void xs_reset_transport(struct sock_xprt *transport) 846 { 847 struct socket *sock = transport->sock; 848 struct sock *sk = transport->inet; 849 struct rpc_xprt *xprt = &transport->xprt; 850 851 if (sk == NULL) 852 return; 853 854 if (atomic_read(&transport->xprt.swapper)) 855 sk_clear_memalloc(sk); 856 857 kernel_sock_shutdown(sock, SHUT_RDWR); 858 859 mutex_lock(&transport->recv_mutex); 860 write_lock_bh(&sk->sk_callback_lock); 861 transport->inet = NULL; 862 transport->sock = NULL; 863 864 sk->sk_user_data = NULL; 865 866 xs_restore_old_callbacks(transport, sk); 867 xprt_clear_connected(xprt); 868 write_unlock_bh(&sk->sk_callback_lock); 869 xs_sock_reset_connection_flags(xprt); 870 mutex_unlock(&transport->recv_mutex); 871 872 trace_rpc_socket_close(xprt, sock); 873 sock_release(sock); 874 } 875 876 /** 877 * xs_close - close a socket 878 * @xprt: transport 879 * 880 * This is used when all requests are complete; ie, no DRC state remains 881 * on the server we want to save. 882 * 883 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 884 * xs_reset_transport() zeroing the socket from underneath a writer. 885 */ 886 static void xs_close(struct rpc_xprt *xprt) 887 { 888 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 889 890 dprintk("RPC: xs_close xprt %p\n", xprt); 891 892 xs_reset_transport(transport); 893 xprt->reestablish_timeout = 0; 894 895 xprt_disconnect_done(xprt); 896 } 897 898 static void xs_inject_disconnect(struct rpc_xprt *xprt) 899 { 900 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 901 xprt); 902 xprt_disconnect_done(xprt); 903 } 904 905 static void xs_xprt_free(struct rpc_xprt *xprt) 906 { 907 xs_free_peer_addresses(xprt); 908 xprt_free(xprt); 909 } 910 911 /** 912 * xs_destroy - prepare to shutdown a transport 913 * @xprt: doomed transport 914 * 915 */ 916 static void xs_destroy(struct rpc_xprt *xprt) 917 { 918 struct sock_xprt *transport = container_of(xprt, 919 struct sock_xprt, xprt); 920 dprintk("RPC: xs_destroy xprt %p\n", xprt); 921 922 cancel_delayed_work_sync(&transport->connect_worker); 923 xs_close(xprt); 924 cancel_work_sync(&transport->recv_worker); 925 xs_xprt_free(xprt); 926 module_put(THIS_MODULE); 927 } 928 929 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 930 { 931 struct xdr_skb_reader desc = { 932 .skb = skb, 933 .offset = sizeof(rpc_fraghdr), 934 .count = skb->len - sizeof(rpc_fraghdr), 935 }; 936 937 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 938 return -1; 939 if (desc.count) 940 return -1; 941 return 0; 942 } 943 944 /** 945 * xs_local_data_read_skb 946 * @xprt: transport 947 * @sk: socket 948 * @skb: skbuff 949 * 950 * Currently this assumes we can read the whole reply in a single gulp. 951 */ 952 static void xs_local_data_read_skb(struct rpc_xprt *xprt, 953 struct sock *sk, 954 struct sk_buff *skb) 955 { 956 struct rpc_task *task; 957 struct rpc_rqst *rovr; 958 int repsize, copied; 959 u32 _xid; 960 __be32 *xp; 961 962 repsize = skb->len - sizeof(rpc_fraghdr); 963 if (repsize < 4) { 964 dprintk("RPC: impossible RPC reply size %d\n", repsize); 965 return; 966 } 967 968 /* Copy the XID from the skb... */ 969 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 970 if (xp == NULL) 971 return; 972 973 /* Look up and lock the request corresponding to the given XID */ 974 spin_lock(&xprt->recv_lock); 975 rovr = xprt_lookup_rqst(xprt, *xp); 976 if (!rovr) 977 goto out_unlock; 978 xprt_pin_rqst(rovr); 979 spin_unlock(&xprt->recv_lock); 980 task = rovr->rq_task; 981 982 copied = rovr->rq_private_buf.buflen; 983 if (copied > repsize) 984 copied = repsize; 985 986 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 987 dprintk("RPC: sk_buff copy failed\n"); 988 spin_lock(&xprt->recv_lock); 989 goto out_unpin; 990 } 991 992 spin_lock(&xprt->recv_lock); 993 xprt_complete_rqst(task, copied); 994 out_unpin: 995 xprt_unpin_rqst(rovr); 996 out_unlock: 997 spin_unlock(&xprt->recv_lock); 998 } 999 1000 static void xs_local_data_receive(struct sock_xprt *transport) 1001 { 1002 struct sk_buff *skb; 1003 struct sock *sk; 1004 int err; 1005 1006 mutex_lock(&transport->recv_mutex); 1007 sk = transport->inet; 1008 if (sk == NULL) 1009 goto out; 1010 for (;;) { 1011 skb = skb_recv_datagram(sk, 0, 1, &err); 1012 if (skb != NULL) { 1013 xs_local_data_read_skb(&transport->xprt, sk, skb); 1014 skb_free_datagram(sk, skb); 1015 continue; 1016 } 1017 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1018 break; 1019 } 1020 out: 1021 mutex_unlock(&transport->recv_mutex); 1022 } 1023 1024 static void xs_local_data_receive_workfn(struct work_struct *work) 1025 { 1026 struct sock_xprt *transport = 1027 container_of(work, struct sock_xprt, recv_worker); 1028 xs_local_data_receive(transport); 1029 } 1030 1031 /** 1032 * xs_udp_data_read_skb - receive callback for UDP sockets 1033 * @xprt: transport 1034 * @sk: socket 1035 * @skb: skbuff 1036 * 1037 */ 1038 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 1039 struct sock *sk, 1040 struct sk_buff *skb) 1041 { 1042 struct rpc_task *task; 1043 struct rpc_rqst *rovr; 1044 int repsize, copied; 1045 u32 _xid; 1046 __be32 *xp; 1047 1048 repsize = skb->len; 1049 if (repsize < 4) { 1050 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1051 return; 1052 } 1053 1054 /* Copy the XID from the skb... */ 1055 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1056 if (xp == NULL) 1057 return; 1058 1059 /* Look up and lock the request corresponding to the given XID */ 1060 spin_lock(&xprt->recv_lock); 1061 rovr = xprt_lookup_rqst(xprt, *xp); 1062 if (!rovr) 1063 goto out_unlock; 1064 xprt_pin_rqst(rovr); 1065 spin_unlock(&xprt->recv_lock); 1066 task = rovr->rq_task; 1067 1068 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1069 copied = repsize; 1070 1071 /* Suck it into the iovec, verify checksum if not done by hw. */ 1072 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1073 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1074 spin_lock(&xprt->recv_lock); 1075 goto out_unpin; 1076 } 1077 1078 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1079 1080 spin_lock_bh(&xprt->transport_lock); 1081 xprt_adjust_cwnd(xprt, task, copied); 1082 spin_unlock_bh(&xprt->transport_lock); 1083 spin_lock(&xprt->recv_lock); 1084 xprt_complete_rqst(task, copied); 1085 out_unpin: 1086 xprt_unpin_rqst(rovr); 1087 out_unlock: 1088 spin_unlock(&xprt->recv_lock); 1089 } 1090 1091 static void xs_udp_data_receive(struct sock_xprt *transport) 1092 { 1093 struct sk_buff *skb; 1094 struct sock *sk; 1095 int err; 1096 1097 mutex_lock(&transport->recv_mutex); 1098 sk = transport->inet; 1099 if (sk == NULL) 1100 goto out; 1101 for (;;) { 1102 skb = skb_recv_udp(sk, 0, 1, &err); 1103 if (skb != NULL) { 1104 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1105 consume_skb(skb); 1106 continue; 1107 } 1108 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1109 break; 1110 } 1111 out: 1112 mutex_unlock(&transport->recv_mutex); 1113 } 1114 1115 static void xs_udp_data_receive_workfn(struct work_struct *work) 1116 { 1117 struct sock_xprt *transport = 1118 container_of(work, struct sock_xprt, recv_worker); 1119 xs_udp_data_receive(transport); 1120 } 1121 1122 /** 1123 * xs_data_ready - "data ready" callback for UDP sockets 1124 * @sk: socket with data to read 1125 * 1126 */ 1127 static void xs_data_ready(struct sock *sk) 1128 { 1129 struct rpc_xprt *xprt; 1130 1131 read_lock_bh(&sk->sk_callback_lock); 1132 dprintk("RPC: xs_data_ready...\n"); 1133 xprt = xprt_from_sock(sk); 1134 if (xprt != NULL) { 1135 struct sock_xprt *transport = container_of(xprt, 1136 struct sock_xprt, xprt); 1137 transport->old_data_ready(sk); 1138 /* Any data means we had a useful conversation, so 1139 * then we don't need to delay the next reconnect 1140 */ 1141 if (xprt->reestablish_timeout) 1142 xprt->reestablish_timeout = 0; 1143 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1144 queue_work(xprtiod_workqueue, &transport->recv_worker); 1145 } 1146 read_unlock_bh(&sk->sk_callback_lock); 1147 } 1148 1149 /* 1150 * Helper function to force a TCP close if the server is sending 1151 * junk and/or it has put us in CLOSE_WAIT 1152 */ 1153 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1154 { 1155 xprt_force_disconnect(xprt); 1156 } 1157 1158 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1159 { 1160 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1161 size_t len, used; 1162 char *p; 1163 1164 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1165 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1166 used = xdr_skb_read_bits(desc, p, len); 1167 transport->tcp_offset += used; 1168 if (used != len) 1169 return; 1170 1171 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1172 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1173 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1174 else 1175 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1176 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1177 1178 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1179 transport->tcp_offset = 0; 1180 1181 /* Sanity check of the record length */ 1182 if (unlikely(transport->tcp_reclen < 8)) { 1183 dprintk("RPC: invalid TCP record fragment length\n"); 1184 xs_tcp_force_close(xprt); 1185 return; 1186 } 1187 dprintk("RPC: reading TCP record fragment of length %d\n", 1188 transport->tcp_reclen); 1189 } 1190 1191 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1192 { 1193 if (transport->tcp_offset == transport->tcp_reclen) { 1194 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1195 transport->tcp_offset = 0; 1196 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1197 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1198 transport->tcp_flags |= TCP_RCV_COPY_XID; 1199 transport->tcp_copied = 0; 1200 } 1201 } 1202 } 1203 1204 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1205 { 1206 size_t len, used; 1207 char *p; 1208 1209 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1210 dprintk("RPC: reading XID (%zu bytes)\n", len); 1211 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1212 used = xdr_skb_read_bits(desc, p, len); 1213 transport->tcp_offset += used; 1214 if (used != len) 1215 return; 1216 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1217 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1218 transport->tcp_copied = 4; 1219 dprintk("RPC: reading %s XID %08x\n", 1220 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1221 : "request with", 1222 ntohl(transport->tcp_xid)); 1223 xs_tcp_check_fraghdr(transport); 1224 } 1225 1226 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1227 struct xdr_skb_reader *desc) 1228 { 1229 size_t len, used; 1230 u32 offset; 1231 char *p; 1232 1233 /* 1234 * We want transport->tcp_offset to be 8 at the end of this routine 1235 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1236 * When this function is called for the first time, 1237 * transport->tcp_offset is 4 (after having already read the xid). 1238 */ 1239 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1240 len = sizeof(transport->tcp_calldir) - offset; 1241 dprintk("RPC: reading CALL/REPLY flag (%zu bytes)\n", len); 1242 p = ((char *) &transport->tcp_calldir) + offset; 1243 used = xdr_skb_read_bits(desc, p, len); 1244 transport->tcp_offset += used; 1245 if (used != len) 1246 return; 1247 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1248 /* 1249 * We don't yet have the XDR buffer, so we will write the calldir 1250 * out after we get the buffer from the 'struct rpc_rqst' 1251 */ 1252 switch (ntohl(transport->tcp_calldir)) { 1253 case RPC_REPLY: 1254 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1255 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1256 transport->tcp_flags |= TCP_RPC_REPLY; 1257 break; 1258 case RPC_CALL: 1259 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1260 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1261 transport->tcp_flags &= ~TCP_RPC_REPLY; 1262 break; 1263 default: 1264 dprintk("RPC: invalid request message type\n"); 1265 xs_tcp_force_close(&transport->xprt); 1266 } 1267 xs_tcp_check_fraghdr(transport); 1268 } 1269 1270 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1271 struct xdr_skb_reader *desc, 1272 struct rpc_rqst *req) 1273 { 1274 struct sock_xprt *transport = 1275 container_of(xprt, struct sock_xprt, xprt); 1276 struct xdr_buf *rcvbuf; 1277 size_t len; 1278 ssize_t r; 1279 1280 rcvbuf = &req->rq_private_buf; 1281 1282 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1283 /* 1284 * Save the RPC direction in the XDR buffer 1285 */ 1286 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1287 &transport->tcp_calldir, 1288 sizeof(transport->tcp_calldir)); 1289 transport->tcp_copied += sizeof(transport->tcp_calldir); 1290 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1291 } 1292 1293 len = desc->count; 1294 if (len > transport->tcp_reclen - transport->tcp_offset) 1295 desc->count = transport->tcp_reclen - transport->tcp_offset; 1296 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1297 desc, xdr_skb_read_bits); 1298 1299 if (desc->count) { 1300 /* Error when copying to the receive buffer, 1301 * usually because we weren't able to allocate 1302 * additional buffer pages. All we can do now 1303 * is turn off TCP_RCV_COPY_DATA, so the request 1304 * will not receive any additional updates, 1305 * and time out. 1306 * Any remaining data from this record will 1307 * be discarded. 1308 */ 1309 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1310 dprintk("RPC: XID %08x truncated request\n", 1311 ntohl(transport->tcp_xid)); 1312 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1313 "tcp_offset = %u, tcp_reclen = %u\n", 1314 xprt, transport->tcp_copied, 1315 transport->tcp_offset, transport->tcp_reclen); 1316 return; 1317 } 1318 1319 transport->tcp_copied += r; 1320 transport->tcp_offset += r; 1321 desc->count = len - r; 1322 1323 dprintk("RPC: XID %08x read %zd bytes\n", 1324 ntohl(transport->tcp_xid), r); 1325 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1326 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1327 transport->tcp_offset, transport->tcp_reclen); 1328 1329 if (transport->tcp_copied == req->rq_private_buf.buflen) 1330 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1331 else if (transport->tcp_offset == transport->tcp_reclen) { 1332 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1333 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1334 } 1335 } 1336 1337 /* 1338 * Finds the request corresponding to the RPC xid and invokes the common 1339 * tcp read code to read the data. 1340 */ 1341 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1342 struct xdr_skb_reader *desc) 1343 { 1344 struct sock_xprt *transport = 1345 container_of(xprt, struct sock_xprt, xprt); 1346 struct rpc_rqst *req; 1347 1348 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1349 1350 /* Find and lock the request corresponding to this xid */ 1351 spin_lock(&xprt->recv_lock); 1352 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1353 if (!req) { 1354 dprintk("RPC: XID %08x request not found!\n", 1355 ntohl(transport->tcp_xid)); 1356 spin_unlock(&xprt->recv_lock); 1357 return -1; 1358 } 1359 xprt_pin_rqst(req); 1360 spin_unlock(&xprt->recv_lock); 1361 1362 xs_tcp_read_common(xprt, desc, req); 1363 1364 spin_lock(&xprt->recv_lock); 1365 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1366 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1367 xprt_unpin_rqst(req); 1368 spin_unlock(&xprt->recv_lock); 1369 return 0; 1370 } 1371 1372 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1373 /* 1374 * Obtains an rpc_rqst previously allocated and invokes the common 1375 * tcp read code to read the data. The result is placed in the callback 1376 * queue. 1377 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1378 * connection and return -1. 1379 */ 1380 static int xs_tcp_read_callback(struct rpc_xprt *xprt, 1381 struct xdr_skb_reader *desc) 1382 { 1383 struct sock_xprt *transport = 1384 container_of(xprt, struct sock_xprt, xprt); 1385 struct rpc_rqst *req; 1386 1387 /* Look up the request corresponding to the given XID */ 1388 req = xprt_lookup_bc_request(xprt, transport->tcp_xid); 1389 if (req == NULL) { 1390 printk(KERN_WARNING "Callback slot table overflowed\n"); 1391 xprt_force_disconnect(xprt); 1392 return -1; 1393 } 1394 1395 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1396 xs_tcp_read_common(xprt, desc, req); 1397 1398 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1399 xprt_complete_bc_request(req, transport->tcp_copied); 1400 1401 return 0; 1402 } 1403 1404 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1405 struct xdr_skb_reader *desc) 1406 { 1407 struct sock_xprt *transport = 1408 container_of(xprt, struct sock_xprt, xprt); 1409 1410 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1411 xs_tcp_read_reply(xprt, desc) : 1412 xs_tcp_read_callback(xprt, desc); 1413 } 1414 1415 static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net) 1416 { 1417 int ret; 1418 1419 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0, 1420 SVC_SOCK_ANONYMOUS); 1421 if (ret < 0) 1422 return ret; 1423 return 0; 1424 } 1425 1426 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) 1427 { 1428 return PAGE_SIZE; 1429 } 1430 #else 1431 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1432 struct xdr_skb_reader *desc) 1433 { 1434 return xs_tcp_read_reply(xprt, desc); 1435 } 1436 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1437 1438 /* 1439 * Read data off the transport. This can be either an RPC_CALL or an 1440 * RPC_REPLY. Relay the processing to helper functions. 1441 */ 1442 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1443 struct xdr_skb_reader *desc) 1444 { 1445 struct sock_xprt *transport = 1446 container_of(xprt, struct sock_xprt, xprt); 1447 1448 if (_xs_tcp_read_data(xprt, desc) == 0) 1449 xs_tcp_check_fraghdr(transport); 1450 else { 1451 /* 1452 * The transport_lock protects the request handling. 1453 * There's no need to hold it to update the tcp_flags. 1454 */ 1455 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1456 } 1457 } 1458 1459 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1460 { 1461 size_t len; 1462 1463 len = transport->tcp_reclen - transport->tcp_offset; 1464 if (len > desc->count) 1465 len = desc->count; 1466 desc->count -= len; 1467 desc->offset += len; 1468 transport->tcp_offset += len; 1469 dprintk("RPC: discarded %zu bytes\n", len); 1470 xs_tcp_check_fraghdr(transport); 1471 } 1472 1473 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1474 { 1475 struct rpc_xprt *xprt = rd_desc->arg.data; 1476 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1477 struct xdr_skb_reader desc = { 1478 .skb = skb, 1479 .offset = offset, 1480 .count = len, 1481 }; 1482 1483 dprintk("RPC: xs_tcp_data_recv started\n"); 1484 do { 1485 trace_xs_tcp_data_recv(transport); 1486 /* Read in a new fragment marker if necessary */ 1487 /* Can we ever really expect to get completely empty fragments? */ 1488 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1489 xs_tcp_read_fraghdr(xprt, &desc); 1490 continue; 1491 } 1492 /* Read in the xid if necessary */ 1493 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1494 xs_tcp_read_xid(transport, &desc); 1495 continue; 1496 } 1497 /* Read in the call/reply flag */ 1498 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1499 xs_tcp_read_calldir(transport, &desc); 1500 continue; 1501 } 1502 /* Read in the request data */ 1503 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1504 xs_tcp_read_data(xprt, &desc); 1505 continue; 1506 } 1507 /* Skip over any trailing bytes on short reads */ 1508 xs_tcp_read_discard(transport, &desc); 1509 } while (desc.count); 1510 trace_xs_tcp_data_recv(transport); 1511 dprintk("RPC: xs_tcp_data_recv done\n"); 1512 return len - desc.count; 1513 } 1514 1515 static void xs_tcp_data_receive(struct sock_xprt *transport) 1516 { 1517 struct rpc_xprt *xprt = &transport->xprt; 1518 struct sock *sk; 1519 read_descriptor_t rd_desc = { 1520 .count = 2*1024*1024, 1521 .arg.data = xprt, 1522 }; 1523 unsigned long total = 0; 1524 int loop; 1525 int read = 0; 1526 1527 mutex_lock(&transport->recv_mutex); 1528 sk = transport->inet; 1529 if (sk == NULL) 1530 goto out; 1531 1532 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1533 for (loop = 0; loop < 64; loop++) { 1534 lock_sock(sk); 1535 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1536 if (read <= 0) { 1537 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 1538 release_sock(sk); 1539 break; 1540 } 1541 release_sock(sk); 1542 total += read; 1543 rd_desc.count = 65536; 1544 } 1545 if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1546 queue_work(xprtiod_workqueue, &transport->recv_worker); 1547 out: 1548 mutex_unlock(&transport->recv_mutex); 1549 trace_xs_tcp_data_ready(xprt, read, total); 1550 } 1551 1552 static void xs_tcp_data_receive_workfn(struct work_struct *work) 1553 { 1554 struct sock_xprt *transport = 1555 container_of(work, struct sock_xprt, recv_worker); 1556 xs_tcp_data_receive(transport); 1557 } 1558 1559 /** 1560 * xs_tcp_state_change - callback to handle TCP socket state changes 1561 * @sk: socket whose state has changed 1562 * 1563 */ 1564 static void xs_tcp_state_change(struct sock *sk) 1565 { 1566 struct rpc_xprt *xprt; 1567 struct sock_xprt *transport; 1568 1569 read_lock_bh(&sk->sk_callback_lock); 1570 if (!(xprt = xprt_from_sock(sk))) 1571 goto out; 1572 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1573 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1574 sk->sk_state, xprt_connected(xprt), 1575 sock_flag(sk, SOCK_DEAD), 1576 sock_flag(sk, SOCK_ZAPPED), 1577 sk->sk_shutdown); 1578 1579 transport = container_of(xprt, struct sock_xprt, xprt); 1580 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1581 switch (sk->sk_state) { 1582 case TCP_ESTABLISHED: 1583 spin_lock(&xprt->transport_lock); 1584 if (!xprt_test_and_set_connected(xprt)) { 1585 1586 /* Reset TCP record info */ 1587 transport->tcp_offset = 0; 1588 transport->tcp_reclen = 0; 1589 transport->tcp_copied = 0; 1590 transport->tcp_flags = 1591 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1592 xprt->connect_cookie++; 1593 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1594 xprt_clear_connecting(xprt); 1595 1596 xprt_wake_pending_tasks(xprt, -EAGAIN); 1597 } 1598 spin_unlock(&xprt->transport_lock); 1599 break; 1600 case TCP_FIN_WAIT1: 1601 /* The client initiated a shutdown of the socket */ 1602 xprt->connect_cookie++; 1603 xprt->reestablish_timeout = 0; 1604 set_bit(XPRT_CLOSING, &xprt->state); 1605 smp_mb__before_atomic(); 1606 clear_bit(XPRT_CONNECTED, &xprt->state); 1607 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1608 smp_mb__after_atomic(); 1609 break; 1610 case TCP_CLOSE_WAIT: 1611 /* The server initiated a shutdown of the socket */ 1612 xprt->connect_cookie++; 1613 clear_bit(XPRT_CONNECTED, &xprt->state); 1614 xs_tcp_force_close(xprt); 1615 /* fall through */ 1616 case TCP_CLOSING: 1617 /* 1618 * If the server closed down the connection, make sure that 1619 * we back off before reconnecting 1620 */ 1621 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1622 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1623 break; 1624 case TCP_LAST_ACK: 1625 set_bit(XPRT_CLOSING, &xprt->state); 1626 smp_mb__before_atomic(); 1627 clear_bit(XPRT_CONNECTED, &xprt->state); 1628 smp_mb__after_atomic(); 1629 break; 1630 case TCP_CLOSE: 1631 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1632 &transport->sock_state)) 1633 xprt_clear_connecting(xprt); 1634 if (sk->sk_err) 1635 xprt_wake_pending_tasks(xprt, -sk->sk_err); 1636 xs_sock_mark_closed(xprt); 1637 } 1638 out: 1639 read_unlock_bh(&sk->sk_callback_lock); 1640 } 1641 1642 static void xs_write_space(struct sock *sk) 1643 { 1644 struct socket_wq *wq; 1645 struct rpc_xprt *xprt; 1646 1647 if (!sk->sk_socket) 1648 return; 1649 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1650 1651 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1652 return; 1653 rcu_read_lock(); 1654 wq = rcu_dereference(sk->sk_wq); 1655 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) 1656 goto out; 1657 1658 xprt_write_space(xprt); 1659 out: 1660 rcu_read_unlock(); 1661 } 1662 1663 /** 1664 * xs_udp_write_space - callback invoked when socket buffer space 1665 * becomes available 1666 * @sk: socket whose state has changed 1667 * 1668 * Called when more output buffer space is available for this socket. 1669 * We try not to wake our writers until they can make "significant" 1670 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1671 * with a bunch of small requests. 1672 */ 1673 static void xs_udp_write_space(struct sock *sk) 1674 { 1675 read_lock_bh(&sk->sk_callback_lock); 1676 1677 /* from net/core/sock.c:sock_def_write_space */ 1678 if (sock_writeable(sk)) 1679 xs_write_space(sk); 1680 1681 read_unlock_bh(&sk->sk_callback_lock); 1682 } 1683 1684 /** 1685 * xs_tcp_write_space - callback invoked when socket buffer space 1686 * becomes available 1687 * @sk: socket whose state has changed 1688 * 1689 * Called when more output buffer space is available for this socket. 1690 * We try not to wake our writers until they can make "significant" 1691 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1692 * with a bunch of small requests. 1693 */ 1694 static void xs_tcp_write_space(struct sock *sk) 1695 { 1696 read_lock_bh(&sk->sk_callback_lock); 1697 1698 /* from net/core/stream.c:sk_stream_write_space */ 1699 if (sk_stream_is_writeable(sk)) 1700 xs_write_space(sk); 1701 1702 read_unlock_bh(&sk->sk_callback_lock); 1703 } 1704 1705 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1706 { 1707 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1708 struct sock *sk = transport->inet; 1709 1710 if (transport->rcvsize) { 1711 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1712 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1713 } 1714 if (transport->sndsize) { 1715 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1716 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1717 sk->sk_write_space(sk); 1718 } 1719 } 1720 1721 /** 1722 * xs_udp_set_buffer_size - set send and receive limits 1723 * @xprt: generic transport 1724 * @sndsize: requested size of send buffer, in bytes 1725 * @rcvsize: requested size of receive buffer, in bytes 1726 * 1727 * Set socket send and receive buffer size limits. 1728 */ 1729 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1730 { 1731 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1732 1733 transport->sndsize = 0; 1734 if (sndsize) 1735 transport->sndsize = sndsize + 1024; 1736 transport->rcvsize = 0; 1737 if (rcvsize) 1738 transport->rcvsize = rcvsize + 1024; 1739 1740 xs_udp_do_set_buffer_size(xprt); 1741 } 1742 1743 /** 1744 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1745 * @task: task that timed out 1746 * 1747 * Adjust the congestion window after a retransmit timeout has occurred. 1748 */ 1749 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1750 { 1751 spin_lock_bh(&xprt->transport_lock); 1752 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1753 spin_unlock_bh(&xprt->transport_lock); 1754 } 1755 1756 static unsigned short xs_get_random_port(void) 1757 { 1758 unsigned short range = xprt_max_resvport - xprt_min_resvport + 1; 1759 unsigned short rand = (unsigned short) prandom_u32() % range; 1760 return rand + xprt_min_resvport; 1761 } 1762 1763 /** 1764 * xs_set_reuseaddr_port - set the socket's port and address reuse options 1765 * @sock: socket 1766 * 1767 * Note that this function has to be called on all sockets that share the 1768 * same port, and it must be called before binding. 1769 */ 1770 static void xs_sock_set_reuseport(struct socket *sock) 1771 { 1772 int opt = 1; 1773 1774 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, 1775 (char *)&opt, sizeof(opt)); 1776 } 1777 1778 static unsigned short xs_sock_getport(struct socket *sock) 1779 { 1780 struct sockaddr_storage buf; 1781 int buflen; 1782 unsigned short port = 0; 1783 1784 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0) 1785 goto out; 1786 switch (buf.ss_family) { 1787 case AF_INET6: 1788 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1789 break; 1790 case AF_INET: 1791 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1792 } 1793 out: 1794 return port; 1795 } 1796 1797 /** 1798 * xs_set_port - reset the port number in the remote endpoint address 1799 * @xprt: generic transport 1800 * @port: new port number 1801 * 1802 */ 1803 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1804 { 1805 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1806 1807 rpc_set_port(xs_addr(xprt), port); 1808 xs_update_peer_port(xprt); 1809 } 1810 1811 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1812 { 1813 if (transport->srcport == 0) 1814 transport->srcport = xs_sock_getport(sock); 1815 } 1816 1817 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1818 { 1819 unsigned short port = transport->srcport; 1820 1821 if (port == 0 && transport->xprt.resvport) 1822 port = xs_get_random_port(); 1823 return port; 1824 } 1825 1826 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1827 { 1828 if (transport->srcport != 0) 1829 transport->srcport = 0; 1830 if (!transport->xprt.resvport) 1831 return 0; 1832 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1833 return xprt_max_resvport; 1834 return --port; 1835 } 1836 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1837 { 1838 struct sockaddr_storage myaddr; 1839 int err, nloop = 0; 1840 unsigned short port = xs_get_srcport(transport); 1841 unsigned short last; 1842 1843 /* 1844 * If we are asking for any ephemeral port (i.e. port == 0 && 1845 * transport->xprt.resvport == 0), don't bind. Let the local 1846 * port selection happen implicitly when the socket is used 1847 * (for example at connect time). 1848 * 1849 * This ensures that we can continue to establish TCP 1850 * connections even when all local ephemeral ports are already 1851 * a part of some TCP connection. This makes no difference 1852 * for UDP sockets, but also doens't harm them. 1853 * 1854 * If we're asking for any reserved port (i.e. port == 0 && 1855 * transport->xprt.resvport == 1) xs_get_srcport above will 1856 * ensure that port is non-zero and we will bind as needed. 1857 */ 1858 if (port == 0) 1859 return 0; 1860 1861 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1862 do { 1863 rpc_set_port((struct sockaddr *)&myaddr, port); 1864 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1865 transport->xprt.addrlen); 1866 if (err == 0) { 1867 transport->srcport = port; 1868 break; 1869 } 1870 last = port; 1871 port = xs_next_srcport(transport, port); 1872 if (port > last) 1873 nloop++; 1874 } while (err == -EADDRINUSE && nloop != 2); 1875 1876 if (myaddr.ss_family == AF_INET) 1877 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1878 &((struct sockaddr_in *)&myaddr)->sin_addr, 1879 port, err ? "failed" : "ok", err); 1880 else 1881 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1882 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1883 port, err ? "failed" : "ok", err); 1884 return err; 1885 } 1886 1887 /* 1888 * We don't support autobind on AF_LOCAL sockets 1889 */ 1890 static void xs_local_rpcbind(struct rpc_task *task) 1891 { 1892 xprt_set_bound(task->tk_xprt); 1893 } 1894 1895 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1896 { 1897 } 1898 1899 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1900 static struct lock_class_key xs_key[2]; 1901 static struct lock_class_key xs_slock_key[2]; 1902 1903 static inline void xs_reclassify_socketu(struct socket *sock) 1904 { 1905 struct sock *sk = sock->sk; 1906 1907 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1908 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1909 } 1910 1911 static inline void xs_reclassify_socket4(struct socket *sock) 1912 { 1913 struct sock *sk = sock->sk; 1914 1915 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1916 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1917 } 1918 1919 static inline void xs_reclassify_socket6(struct socket *sock) 1920 { 1921 struct sock *sk = sock->sk; 1922 1923 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1924 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1925 } 1926 1927 static inline void xs_reclassify_socket(int family, struct socket *sock) 1928 { 1929 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1930 return; 1931 1932 switch (family) { 1933 case AF_LOCAL: 1934 xs_reclassify_socketu(sock); 1935 break; 1936 case AF_INET: 1937 xs_reclassify_socket4(sock); 1938 break; 1939 case AF_INET6: 1940 xs_reclassify_socket6(sock); 1941 break; 1942 } 1943 } 1944 #else 1945 static inline void xs_reclassify_socket(int family, struct socket *sock) 1946 { 1947 } 1948 #endif 1949 1950 static void xs_dummy_setup_socket(struct work_struct *work) 1951 { 1952 } 1953 1954 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1955 struct sock_xprt *transport, int family, int type, 1956 int protocol, bool reuseport) 1957 { 1958 struct socket *sock; 1959 int err; 1960 1961 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1962 if (err < 0) { 1963 dprintk("RPC: can't create %d transport socket (%d).\n", 1964 protocol, -err); 1965 goto out; 1966 } 1967 xs_reclassify_socket(family, sock); 1968 1969 if (reuseport) 1970 xs_sock_set_reuseport(sock); 1971 1972 err = xs_bind(transport, sock); 1973 if (err) { 1974 sock_release(sock); 1975 goto out; 1976 } 1977 1978 return sock; 1979 out: 1980 return ERR_PTR(err); 1981 } 1982 1983 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1984 struct socket *sock) 1985 { 1986 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1987 xprt); 1988 1989 if (!transport->inet) { 1990 struct sock *sk = sock->sk; 1991 1992 write_lock_bh(&sk->sk_callback_lock); 1993 1994 xs_save_old_callbacks(transport, sk); 1995 1996 sk->sk_user_data = xprt; 1997 sk->sk_data_ready = xs_data_ready; 1998 sk->sk_write_space = xs_udp_write_space; 1999 sock_set_flag(sk, SOCK_FASYNC); 2000 sk->sk_error_report = xs_error_report; 2001 sk->sk_allocation = GFP_NOIO; 2002 2003 xprt_clear_connected(xprt); 2004 2005 /* Reset to new socket */ 2006 transport->sock = sock; 2007 transport->inet = sk; 2008 2009 write_unlock_bh(&sk->sk_callback_lock); 2010 } 2011 2012 /* Tell the socket layer to start connecting... */ 2013 xprt->stat.connect_count++; 2014 xprt->stat.connect_start = jiffies; 2015 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 2016 } 2017 2018 /** 2019 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 2020 * @transport: socket transport to connect 2021 */ 2022 static int xs_local_setup_socket(struct sock_xprt *transport) 2023 { 2024 struct rpc_xprt *xprt = &transport->xprt; 2025 struct socket *sock; 2026 int status = -EIO; 2027 2028 status = __sock_create(xprt->xprt_net, AF_LOCAL, 2029 SOCK_STREAM, 0, &sock, 1); 2030 if (status < 0) { 2031 dprintk("RPC: can't create AF_LOCAL " 2032 "transport socket (%d).\n", -status); 2033 goto out; 2034 } 2035 xs_reclassify_socket(AF_LOCAL, sock); 2036 2037 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 2038 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2039 2040 status = xs_local_finish_connecting(xprt, sock); 2041 trace_rpc_socket_connect(xprt, sock, status); 2042 switch (status) { 2043 case 0: 2044 dprintk("RPC: xprt %p connected to %s\n", 2045 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2046 xprt_set_connected(xprt); 2047 case -ENOBUFS: 2048 break; 2049 case -ENOENT: 2050 dprintk("RPC: xprt %p: socket %s does not exist\n", 2051 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2052 break; 2053 case -ECONNREFUSED: 2054 dprintk("RPC: xprt %p: connection refused for %s\n", 2055 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2056 break; 2057 default: 2058 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 2059 __func__, -status, 2060 xprt->address_strings[RPC_DISPLAY_ADDR]); 2061 } 2062 2063 out: 2064 xprt_clear_connecting(xprt); 2065 xprt_wake_pending_tasks(xprt, status); 2066 return status; 2067 } 2068 2069 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2070 { 2071 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2072 int ret; 2073 2074 if (RPC_IS_ASYNC(task)) { 2075 /* 2076 * We want the AF_LOCAL connect to be resolved in the 2077 * filesystem namespace of the process making the rpc 2078 * call. Thus we connect synchronously. 2079 * 2080 * If we want to support asynchronous AF_LOCAL calls, 2081 * we'll need to figure out how to pass a namespace to 2082 * connect. 2083 */ 2084 rpc_exit(task, -ENOTCONN); 2085 return; 2086 } 2087 ret = xs_local_setup_socket(transport); 2088 if (ret && !RPC_IS_SOFTCONN(task)) 2089 msleep_interruptible(15000); 2090 } 2091 2092 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 2093 /* 2094 * Note that this should be called with XPRT_LOCKED held (or when we otherwise 2095 * know that we have exclusive access to the socket), to guard against 2096 * races with xs_reset_transport. 2097 */ 2098 static void xs_set_memalloc(struct rpc_xprt *xprt) 2099 { 2100 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2101 xprt); 2102 2103 /* 2104 * If there's no sock, then we have nothing to set. The 2105 * reconnecting process will get it for us. 2106 */ 2107 if (!transport->inet) 2108 return; 2109 if (atomic_read(&xprt->swapper)) 2110 sk_set_memalloc(transport->inet); 2111 } 2112 2113 /** 2114 * xs_enable_swap - Tag this transport as being used for swap. 2115 * @xprt: transport to tag 2116 * 2117 * Take a reference to this transport on behalf of the rpc_clnt, and 2118 * optionally mark it for swapping if it wasn't already. 2119 */ 2120 static int 2121 xs_enable_swap(struct rpc_xprt *xprt) 2122 { 2123 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2124 2125 if (atomic_inc_return(&xprt->swapper) != 1) 2126 return 0; 2127 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2128 return -ERESTARTSYS; 2129 if (xs->inet) 2130 sk_set_memalloc(xs->inet); 2131 xprt_release_xprt(xprt, NULL); 2132 return 0; 2133 } 2134 2135 /** 2136 * xs_disable_swap - Untag this transport as being used for swap. 2137 * @xprt: transport to tag 2138 * 2139 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2140 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2141 */ 2142 static void 2143 xs_disable_swap(struct rpc_xprt *xprt) 2144 { 2145 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2146 2147 if (!atomic_dec_and_test(&xprt->swapper)) 2148 return; 2149 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2150 return; 2151 if (xs->inet) 2152 sk_clear_memalloc(xs->inet); 2153 xprt_release_xprt(xprt, NULL); 2154 } 2155 #else 2156 static void xs_set_memalloc(struct rpc_xprt *xprt) 2157 { 2158 } 2159 2160 static int 2161 xs_enable_swap(struct rpc_xprt *xprt) 2162 { 2163 return -EINVAL; 2164 } 2165 2166 static void 2167 xs_disable_swap(struct rpc_xprt *xprt) 2168 { 2169 } 2170 #endif 2171 2172 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2173 { 2174 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2175 2176 if (!transport->inet) { 2177 struct sock *sk = sock->sk; 2178 2179 write_lock_bh(&sk->sk_callback_lock); 2180 2181 xs_save_old_callbacks(transport, sk); 2182 2183 sk->sk_user_data = xprt; 2184 sk->sk_data_ready = xs_data_ready; 2185 sk->sk_write_space = xs_udp_write_space; 2186 sock_set_flag(sk, SOCK_FASYNC); 2187 sk->sk_allocation = GFP_NOIO; 2188 2189 xprt_set_connected(xprt); 2190 2191 /* Reset to new socket */ 2192 transport->sock = sock; 2193 transport->inet = sk; 2194 2195 xs_set_memalloc(xprt); 2196 2197 write_unlock_bh(&sk->sk_callback_lock); 2198 } 2199 xs_udp_do_set_buffer_size(xprt); 2200 2201 xprt->stat.connect_start = jiffies; 2202 } 2203 2204 static void xs_udp_setup_socket(struct work_struct *work) 2205 { 2206 struct sock_xprt *transport = 2207 container_of(work, struct sock_xprt, connect_worker.work); 2208 struct rpc_xprt *xprt = &transport->xprt; 2209 struct socket *sock; 2210 int status = -EIO; 2211 2212 sock = xs_create_sock(xprt, transport, 2213 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2214 IPPROTO_UDP, false); 2215 if (IS_ERR(sock)) 2216 goto out; 2217 2218 dprintk("RPC: worker connecting xprt %p via %s to " 2219 "%s (port %s)\n", xprt, 2220 xprt->address_strings[RPC_DISPLAY_PROTO], 2221 xprt->address_strings[RPC_DISPLAY_ADDR], 2222 xprt->address_strings[RPC_DISPLAY_PORT]); 2223 2224 xs_udp_finish_connecting(xprt, sock); 2225 trace_rpc_socket_connect(xprt, sock, 0); 2226 status = 0; 2227 out: 2228 xprt_unlock_connect(xprt, transport); 2229 xprt_clear_connecting(xprt); 2230 xprt_wake_pending_tasks(xprt, status); 2231 } 2232 2233 /** 2234 * xs_tcp_shutdown - gracefully shut down a TCP socket 2235 * @xprt: transport 2236 * 2237 * Initiates a graceful shutdown of the TCP socket by calling the 2238 * equivalent of shutdown(SHUT_RDWR); 2239 */ 2240 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2241 { 2242 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2243 struct socket *sock = transport->sock; 2244 2245 if (sock == NULL) 2246 return; 2247 if (xprt_connected(xprt)) { 2248 kernel_sock_shutdown(sock, SHUT_RDWR); 2249 trace_rpc_socket_shutdown(xprt, sock); 2250 } else 2251 xs_reset_transport(transport); 2252 } 2253 2254 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 2255 struct socket *sock) 2256 { 2257 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2258 unsigned int keepidle; 2259 unsigned int keepcnt; 2260 unsigned int opt_on = 1; 2261 unsigned int timeo; 2262 2263 spin_lock_bh(&xprt->transport_lock); 2264 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); 2265 keepcnt = xprt->timeout->to_retries + 1; 2266 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2267 (xprt->timeout->to_retries + 1); 2268 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2269 spin_unlock_bh(&xprt->transport_lock); 2270 2271 /* TCP Keepalive options */ 2272 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2273 (char *)&opt_on, sizeof(opt_on)); 2274 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2275 (char *)&keepidle, sizeof(keepidle)); 2276 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2277 (char *)&keepidle, sizeof(keepidle)); 2278 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2279 (char *)&keepcnt, sizeof(keepcnt)); 2280 2281 /* TCP user timeout (see RFC5482) */ 2282 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, 2283 (char *)&timeo, sizeof(timeo)); 2284 } 2285 2286 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, 2287 unsigned long connect_timeout, 2288 unsigned long reconnect_timeout) 2289 { 2290 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2291 struct rpc_timeout to; 2292 unsigned long initval; 2293 2294 spin_lock_bh(&xprt->transport_lock); 2295 if (reconnect_timeout < xprt->max_reconnect_timeout) 2296 xprt->max_reconnect_timeout = reconnect_timeout; 2297 if (connect_timeout < xprt->connect_timeout) { 2298 memcpy(&to, xprt->timeout, sizeof(to)); 2299 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); 2300 /* Arbitrary lower limit */ 2301 if (initval < XS_TCP_INIT_REEST_TO << 1) 2302 initval = XS_TCP_INIT_REEST_TO << 1; 2303 to.to_initval = initval; 2304 to.to_maxval = initval; 2305 memcpy(&transport->tcp_timeout, &to, 2306 sizeof(transport->tcp_timeout)); 2307 xprt->timeout = &transport->tcp_timeout; 2308 xprt->connect_timeout = connect_timeout; 2309 } 2310 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2311 spin_unlock_bh(&xprt->transport_lock); 2312 } 2313 2314 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2315 { 2316 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2317 int ret = -ENOTCONN; 2318 2319 if (!transport->inet) { 2320 struct sock *sk = sock->sk; 2321 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC; 2322 2323 /* Avoid temporary address, they are bad for long-lived 2324 * connections such as NFS mounts. 2325 * RFC4941, section 3.6 suggests that: 2326 * Individual applications, which have specific 2327 * knowledge about the normal duration of connections, 2328 * MAY override this as appropriate. 2329 */ 2330 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES, 2331 (char *)&addr_pref, sizeof(addr_pref)); 2332 2333 xs_tcp_set_socket_timeouts(xprt, sock); 2334 2335 write_lock_bh(&sk->sk_callback_lock); 2336 2337 xs_save_old_callbacks(transport, sk); 2338 2339 sk->sk_user_data = xprt; 2340 sk->sk_data_ready = xs_data_ready; 2341 sk->sk_state_change = xs_tcp_state_change; 2342 sk->sk_write_space = xs_tcp_write_space; 2343 sock_set_flag(sk, SOCK_FASYNC); 2344 sk->sk_error_report = xs_error_report; 2345 sk->sk_allocation = GFP_NOIO; 2346 2347 /* socket options */ 2348 sock_reset_flag(sk, SOCK_LINGER); 2349 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2350 2351 xprt_clear_connected(xprt); 2352 2353 /* Reset to new socket */ 2354 transport->sock = sock; 2355 transport->inet = sk; 2356 2357 write_unlock_bh(&sk->sk_callback_lock); 2358 } 2359 2360 if (!xprt_bound(xprt)) 2361 goto out; 2362 2363 xs_set_memalloc(xprt); 2364 2365 /* Tell the socket layer to start connecting... */ 2366 xprt->stat.connect_count++; 2367 xprt->stat.connect_start = jiffies; 2368 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2369 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2370 switch (ret) { 2371 case 0: 2372 xs_set_srcport(transport, sock); 2373 /* fall through */ 2374 case -EINPROGRESS: 2375 /* SYN_SENT! */ 2376 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2377 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2378 break; 2379 case -EADDRNOTAVAIL: 2380 /* Source port number is unavailable. Try a new one! */ 2381 transport->srcport = 0; 2382 } 2383 out: 2384 return ret; 2385 } 2386 2387 /** 2388 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2389 * 2390 * Invoked by a work queue tasklet. 2391 */ 2392 static void xs_tcp_setup_socket(struct work_struct *work) 2393 { 2394 struct sock_xprt *transport = 2395 container_of(work, struct sock_xprt, connect_worker.work); 2396 struct socket *sock = transport->sock; 2397 struct rpc_xprt *xprt = &transport->xprt; 2398 int status = -EIO; 2399 2400 if (!sock) { 2401 sock = xs_create_sock(xprt, transport, 2402 xs_addr(xprt)->sa_family, SOCK_STREAM, 2403 IPPROTO_TCP, true); 2404 if (IS_ERR(sock)) { 2405 status = PTR_ERR(sock); 2406 goto out; 2407 } 2408 } 2409 2410 dprintk("RPC: worker connecting xprt %p via %s to " 2411 "%s (port %s)\n", xprt, 2412 xprt->address_strings[RPC_DISPLAY_PROTO], 2413 xprt->address_strings[RPC_DISPLAY_ADDR], 2414 xprt->address_strings[RPC_DISPLAY_PORT]); 2415 2416 status = xs_tcp_finish_connecting(xprt, sock); 2417 trace_rpc_socket_connect(xprt, sock, status); 2418 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2419 xprt, -status, xprt_connected(xprt), 2420 sock->sk->sk_state); 2421 switch (status) { 2422 default: 2423 printk("%s: connect returned unhandled error %d\n", 2424 __func__, status); 2425 /* fall through */ 2426 case -EADDRNOTAVAIL: 2427 /* We're probably in TIME_WAIT. Get rid of existing socket, 2428 * and retry 2429 */ 2430 xs_tcp_force_close(xprt); 2431 break; 2432 case 0: 2433 case -EINPROGRESS: 2434 case -EALREADY: 2435 xprt_unlock_connect(xprt, transport); 2436 return; 2437 case -EINVAL: 2438 /* Happens, for instance, if the user specified a link 2439 * local IPv6 address without a scope-id. 2440 */ 2441 case -ECONNREFUSED: 2442 case -ECONNRESET: 2443 case -ENETDOWN: 2444 case -ENETUNREACH: 2445 case -EHOSTUNREACH: 2446 case -EADDRINUSE: 2447 case -ENOBUFS: 2448 /* 2449 * xs_tcp_force_close() wakes tasks with -EIO. 2450 * We need to wake them first to ensure the 2451 * correct error code. 2452 */ 2453 xprt_wake_pending_tasks(xprt, status); 2454 xs_tcp_force_close(xprt); 2455 goto out; 2456 } 2457 status = -EAGAIN; 2458 out: 2459 xprt_unlock_connect(xprt, transport); 2460 xprt_clear_connecting(xprt); 2461 xprt_wake_pending_tasks(xprt, status); 2462 } 2463 2464 static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt) 2465 { 2466 unsigned long start, now = jiffies; 2467 2468 start = xprt->stat.connect_start + xprt->reestablish_timeout; 2469 if (time_after(start, now)) 2470 return start - now; 2471 return 0; 2472 } 2473 2474 static void xs_reconnect_backoff(struct rpc_xprt *xprt) 2475 { 2476 xprt->reestablish_timeout <<= 1; 2477 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout) 2478 xprt->reestablish_timeout = xprt->max_reconnect_timeout; 2479 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2480 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2481 } 2482 2483 /** 2484 * xs_connect - connect a socket to a remote endpoint 2485 * @xprt: pointer to transport structure 2486 * @task: address of RPC task that manages state of connect request 2487 * 2488 * TCP: If the remote end dropped the connection, delay reconnecting. 2489 * 2490 * UDP socket connects are synchronous, but we use a work queue anyway 2491 * to guarantee that even unprivileged user processes can set up a 2492 * socket on a privileged port. 2493 * 2494 * If a UDP socket connect fails, the delay behavior here prevents 2495 * retry floods (hard mounts). 2496 */ 2497 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2498 { 2499 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2500 unsigned long delay = 0; 2501 2502 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2503 2504 if (transport->sock != NULL) { 2505 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2506 "seconds\n", 2507 xprt, xprt->reestablish_timeout / HZ); 2508 2509 /* Start by resetting any existing state */ 2510 xs_reset_transport(transport); 2511 2512 delay = xs_reconnect_delay(xprt); 2513 xs_reconnect_backoff(xprt); 2514 2515 } else 2516 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2517 2518 queue_delayed_work(xprtiod_workqueue, 2519 &transport->connect_worker, 2520 delay); 2521 } 2522 2523 /** 2524 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2525 * @xprt: rpc_xprt struct containing statistics 2526 * @seq: output file 2527 * 2528 */ 2529 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2530 { 2531 long idle_time = 0; 2532 2533 if (xprt_connected(xprt)) 2534 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2535 2536 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2537 "%llu %llu %lu %llu %llu\n", 2538 xprt->stat.bind_count, 2539 xprt->stat.connect_count, 2540 xprt->stat.connect_time, 2541 idle_time, 2542 xprt->stat.sends, 2543 xprt->stat.recvs, 2544 xprt->stat.bad_xids, 2545 xprt->stat.req_u, 2546 xprt->stat.bklog_u, 2547 xprt->stat.max_slots, 2548 xprt->stat.sending_u, 2549 xprt->stat.pending_u); 2550 } 2551 2552 /** 2553 * xs_udp_print_stats - display UDP socket-specifc stats 2554 * @xprt: rpc_xprt struct containing statistics 2555 * @seq: output file 2556 * 2557 */ 2558 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2559 { 2560 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2561 2562 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2563 "%lu %llu %llu\n", 2564 transport->srcport, 2565 xprt->stat.bind_count, 2566 xprt->stat.sends, 2567 xprt->stat.recvs, 2568 xprt->stat.bad_xids, 2569 xprt->stat.req_u, 2570 xprt->stat.bklog_u, 2571 xprt->stat.max_slots, 2572 xprt->stat.sending_u, 2573 xprt->stat.pending_u); 2574 } 2575 2576 /** 2577 * xs_tcp_print_stats - display TCP socket-specifc stats 2578 * @xprt: rpc_xprt struct containing statistics 2579 * @seq: output file 2580 * 2581 */ 2582 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2583 { 2584 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2585 long idle_time = 0; 2586 2587 if (xprt_connected(xprt)) 2588 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2589 2590 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2591 "%llu %llu %lu %llu %llu\n", 2592 transport->srcport, 2593 xprt->stat.bind_count, 2594 xprt->stat.connect_count, 2595 xprt->stat.connect_time, 2596 idle_time, 2597 xprt->stat.sends, 2598 xprt->stat.recvs, 2599 xprt->stat.bad_xids, 2600 xprt->stat.req_u, 2601 xprt->stat.bklog_u, 2602 xprt->stat.max_slots, 2603 xprt->stat.sending_u, 2604 xprt->stat.pending_u); 2605 } 2606 2607 /* 2608 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2609 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2610 * to use the server side send routines. 2611 */ 2612 static int bc_malloc(struct rpc_task *task) 2613 { 2614 struct rpc_rqst *rqst = task->tk_rqstp; 2615 size_t size = rqst->rq_callsize; 2616 struct page *page; 2617 struct rpc_buffer *buf; 2618 2619 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { 2620 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", 2621 size); 2622 return -EINVAL; 2623 } 2624 2625 page = alloc_page(GFP_KERNEL); 2626 if (!page) 2627 return -ENOMEM; 2628 2629 buf = page_address(page); 2630 buf->len = PAGE_SIZE; 2631 2632 rqst->rq_buffer = buf->data; 2633 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; 2634 return 0; 2635 } 2636 2637 /* 2638 * Free the space allocated in the bc_alloc routine 2639 */ 2640 static void bc_free(struct rpc_task *task) 2641 { 2642 void *buffer = task->tk_rqstp->rq_buffer; 2643 struct rpc_buffer *buf; 2644 2645 buf = container_of(buffer, struct rpc_buffer, data); 2646 free_page((unsigned long)buf); 2647 } 2648 2649 /* 2650 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2651 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2652 */ 2653 static int bc_sendto(struct rpc_rqst *req) 2654 { 2655 int len; 2656 struct xdr_buf *xbufp = &req->rq_snd_buf; 2657 struct rpc_xprt *xprt = req->rq_xprt; 2658 struct sock_xprt *transport = 2659 container_of(xprt, struct sock_xprt, xprt); 2660 struct socket *sock = transport->sock; 2661 unsigned long headoff; 2662 unsigned long tailoff; 2663 2664 xs_encode_stream_record_marker(xbufp); 2665 2666 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2667 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2668 len = svc_send_common(sock, xbufp, 2669 virt_to_page(xbufp->head[0].iov_base), headoff, 2670 xbufp->tail[0].iov_base, tailoff); 2671 2672 if (len != xbufp->len) { 2673 printk(KERN_NOTICE "Error sending entire callback!\n"); 2674 len = -EAGAIN; 2675 } 2676 2677 return len; 2678 } 2679 2680 /* 2681 * The send routine. Borrows from svc_send 2682 */ 2683 static int bc_send_request(struct rpc_task *task) 2684 { 2685 struct rpc_rqst *req = task->tk_rqstp; 2686 struct svc_xprt *xprt; 2687 int len; 2688 2689 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2690 /* 2691 * Get the server socket associated with this callback xprt 2692 */ 2693 xprt = req->rq_xprt->bc_xprt; 2694 2695 /* 2696 * Grab the mutex to serialize data as the connection is shared 2697 * with the fore channel 2698 */ 2699 if (!mutex_trylock(&xprt->xpt_mutex)) { 2700 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2701 if (!mutex_trylock(&xprt->xpt_mutex)) 2702 return -EAGAIN; 2703 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2704 } 2705 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2706 len = -ENOTCONN; 2707 else 2708 len = bc_sendto(req); 2709 mutex_unlock(&xprt->xpt_mutex); 2710 2711 if (len > 0) 2712 len = 0; 2713 2714 return len; 2715 } 2716 2717 /* 2718 * The close routine. Since this is client initiated, we do nothing 2719 */ 2720 2721 static void bc_close(struct rpc_xprt *xprt) 2722 { 2723 } 2724 2725 /* 2726 * The xprt destroy routine. Again, because this connection is client 2727 * initiated, we do nothing 2728 */ 2729 2730 static void bc_destroy(struct rpc_xprt *xprt) 2731 { 2732 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2733 2734 xs_xprt_free(xprt); 2735 module_put(THIS_MODULE); 2736 } 2737 2738 static const struct rpc_xprt_ops xs_local_ops = { 2739 .reserve_xprt = xprt_reserve_xprt, 2740 .release_xprt = xs_tcp_release_xprt, 2741 .alloc_slot = xprt_alloc_slot, 2742 .rpcbind = xs_local_rpcbind, 2743 .set_port = xs_local_set_port, 2744 .connect = xs_local_connect, 2745 .buf_alloc = rpc_malloc, 2746 .buf_free = rpc_free, 2747 .send_request = xs_local_send_request, 2748 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2749 .close = xs_close, 2750 .destroy = xs_destroy, 2751 .print_stats = xs_local_print_stats, 2752 .enable_swap = xs_enable_swap, 2753 .disable_swap = xs_disable_swap, 2754 }; 2755 2756 static const struct rpc_xprt_ops xs_udp_ops = { 2757 .set_buffer_size = xs_udp_set_buffer_size, 2758 .reserve_xprt = xprt_reserve_xprt_cong, 2759 .release_xprt = xprt_release_xprt_cong, 2760 .alloc_slot = xprt_alloc_slot, 2761 .rpcbind = rpcb_getport_async, 2762 .set_port = xs_set_port, 2763 .connect = xs_connect, 2764 .buf_alloc = rpc_malloc, 2765 .buf_free = rpc_free, 2766 .send_request = xs_udp_send_request, 2767 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2768 .timer = xs_udp_timer, 2769 .release_request = xprt_release_rqst_cong, 2770 .close = xs_close, 2771 .destroy = xs_destroy, 2772 .print_stats = xs_udp_print_stats, 2773 .enable_swap = xs_enable_swap, 2774 .disable_swap = xs_disable_swap, 2775 .inject_disconnect = xs_inject_disconnect, 2776 }; 2777 2778 static const struct rpc_xprt_ops xs_tcp_ops = { 2779 .reserve_xprt = xprt_reserve_xprt, 2780 .release_xprt = xs_tcp_release_xprt, 2781 .alloc_slot = xprt_lock_and_alloc_slot, 2782 .rpcbind = rpcb_getport_async, 2783 .set_port = xs_set_port, 2784 .connect = xs_connect, 2785 .buf_alloc = rpc_malloc, 2786 .buf_free = rpc_free, 2787 .send_request = xs_tcp_send_request, 2788 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2789 .close = xs_tcp_shutdown, 2790 .destroy = xs_destroy, 2791 .set_connect_timeout = xs_tcp_set_connect_timeout, 2792 .print_stats = xs_tcp_print_stats, 2793 .enable_swap = xs_enable_swap, 2794 .disable_swap = xs_disable_swap, 2795 .inject_disconnect = xs_inject_disconnect, 2796 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2797 .bc_setup = xprt_setup_bc, 2798 .bc_up = xs_tcp_bc_up, 2799 .bc_maxpayload = xs_tcp_bc_maxpayload, 2800 .bc_free_rqst = xprt_free_bc_rqst, 2801 .bc_destroy = xprt_destroy_bc, 2802 #endif 2803 }; 2804 2805 /* 2806 * The rpc_xprt_ops for the server backchannel 2807 */ 2808 2809 static const struct rpc_xprt_ops bc_tcp_ops = { 2810 .reserve_xprt = xprt_reserve_xprt, 2811 .release_xprt = xprt_release_xprt, 2812 .alloc_slot = xprt_alloc_slot, 2813 .buf_alloc = bc_malloc, 2814 .buf_free = bc_free, 2815 .send_request = bc_send_request, 2816 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2817 .close = bc_close, 2818 .destroy = bc_destroy, 2819 .print_stats = xs_tcp_print_stats, 2820 .enable_swap = xs_enable_swap, 2821 .disable_swap = xs_disable_swap, 2822 .inject_disconnect = xs_inject_disconnect, 2823 }; 2824 2825 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2826 { 2827 static const struct sockaddr_in sin = { 2828 .sin_family = AF_INET, 2829 .sin_addr.s_addr = htonl(INADDR_ANY), 2830 }; 2831 static const struct sockaddr_in6 sin6 = { 2832 .sin6_family = AF_INET6, 2833 .sin6_addr = IN6ADDR_ANY_INIT, 2834 }; 2835 2836 switch (family) { 2837 case AF_LOCAL: 2838 break; 2839 case AF_INET: 2840 memcpy(sap, &sin, sizeof(sin)); 2841 break; 2842 case AF_INET6: 2843 memcpy(sap, &sin6, sizeof(sin6)); 2844 break; 2845 default: 2846 dprintk("RPC: %s: Bad address family\n", __func__); 2847 return -EAFNOSUPPORT; 2848 } 2849 return 0; 2850 } 2851 2852 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2853 unsigned int slot_table_size, 2854 unsigned int max_slot_table_size) 2855 { 2856 struct rpc_xprt *xprt; 2857 struct sock_xprt *new; 2858 2859 if (args->addrlen > sizeof(xprt->addr)) { 2860 dprintk("RPC: xs_setup_xprt: address too large\n"); 2861 return ERR_PTR(-EBADF); 2862 } 2863 2864 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2865 max_slot_table_size); 2866 if (xprt == NULL) { 2867 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2868 "rpc_xprt\n"); 2869 return ERR_PTR(-ENOMEM); 2870 } 2871 2872 new = container_of(xprt, struct sock_xprt, xprt); 2873 mutex_init(&new->recv_mutex); 2874 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2875 xprt->addrlen = args->addrlen; 2876 if (args->srcaddr) 2877 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2878 else { 2879 int err; 2880 err = xs_init_anyaddr(args->dstaddr->sa_family, 2881 (struct sockaddr *)&new->srcaddr); 2882 if (err != 0) { 2883 xprt_free(xprt); 2884 return ERR_PTR(err); 2885 } 2886 } 2887 2888 return xprt; 2889 } 2890 2891 static const struct rpc_timeout xs_local_default_timeout = { 2892 .to_initval = 10 * HZ, 2893 .to_maxval = 10 * HZ, 2894 .to_retries = 2, 2895 }; 2896 2897 /** 2898 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2899 * @args: rpc transport creation arguments 2900 * 2901 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2902 */ 2903 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2904 { 2905 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2906 struct sock_xprt *transport; 2907 struct rpc_xprt *xprt; 2908 struct rpc_xprt *ret; 2909 2910 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2911 xprt_max_tcp_slot_table_entries); 2912 if (IS_ERR(xprt)) 2913 return xprt; 2914 transport = container_of(xprt, struct sock_xprt, xprt); 2915 2916 xprt->prot = 0; 2917 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2918 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2919 2920 xprt->bind_timeout = XS_BIND_TO; 2921 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2922 xprt->idle_timeout = XS_IDLE_DISC_TO; 2923 2924 xprt->ops = &xs_local_ops; 2925 xprt->timeout = &xs_local_default_timeout; 2926 2927 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn); 2928 INIT_DELAYED_WORK(&transport->connect_worker, 2929 xs_dummy_setup_socket); 2930 2931 switch (sun->sun_family) { 2932 case AF_LOCAL: 2933 if (sun->sun_path[0] != '/') { 2934 dprintk("RPC: bad AF_LOCAL address: %s\n", 2935 sun->sun_path); 2936 ret = ERR_PTR(-EINVAL); 2937 goto out_err; 2938 } 2939 xprt_set_bound(xprt); 2940 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2941 ret = ERR_PTR(xs_local_setup_socket(transport)); 2942 if (ret) 2943 goto out_err; 2944 break; 2945 default: 2946 ret = ERR_PTR(-EAFNOSUPPORT); 2947 goto out_err; 2948 } 2949 2950 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2951 xprt->address_strings[RPC_DISPLAY_ADDR]); 2952 2953 if (try_module_get(THIS_MODULE)) 2954 return xprt; 2955 ret = ERR_PTR(-EINVAL); 2956 out_err: 2957 xs_xprt_free(xprt); 2958 return ret; 2959 } 2960 2961 static const struct rpc_timeout xs_udp_default_timeout = { 2962 .to_initval = 5 * HZ, 2963 .to_maxval = 30 * HZ, 2964 .to_increment = 5 * HZ, 2965 .to_retries = 5, 2966 }; 2967 2968 /** 2969 * xs_setup_udp - Set up transport to use a UDP socket 2970 * @args: rpc transport creation arguments 2971 * 2972 */ 2973 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2974 { 2975 struct sockaddr *addr = args->dstaddr; 2976 struct rpc_xprt *xprt; 2977 struct sock_xprt *transport; 2978 struct rpc_xprt *ret; 2979 2980 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2981 xprt_udp_slot_table_entries); 2982 if (IS_ERR(xprt)) 2983 return xprt; 2984 transport = container_of(xprt, struct sock_xprt, xprt); 2985 2986 xprt->prot = IPPROTO_UDP; 2987 xprt->tsh_size = 0; 2988 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2989 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2990 2991 xprt->bind_timeout = XS_BIND_TO; 2992 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2993 xprt->idle_timeout = XS_IDLE_DISC_TO; 2994 2995 xprt->ops = &xs_udp_ops; 2996 2997 xprt->timeout = &xs_udp_default_timeout; 2998 2999 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 3000 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 3001 3002 switch (addr->sa_family) { 3003 case AF_INET: 3004 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3005 xprt_set_bound(xprt); 3006 3007 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 3008 break; 3009 case AF_INET6: 3010 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3011 xprt_set_bound(xprt); 3012 3013 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 3014 break; 3015 default: 3016 ret = ERR_PTR(-EAFNOSUPPORT); 3017 goto out_err; 3018 } 3019 3020 if (xprt_bound(xprt)) 3021 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3022 xprt->address_strings[RPC_DISPLAY_ADDR], 3023 xprt->address_strings[RPC_DISPLAY_PORT], 3024 xprt->address_strings[RPC_DISPLAY_PROTO]); 3025 else 3026 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3027 xprt->address_strings[RPC_DISPLAY_ADDR], 3028 xprt->address_strings[RPC_DISPLAY_PROTO]); 3029 3030 if (try_module_get(THIS_MODULE)) 3031 return xprt; 3032 ret = ERR_PTR(-EINVAL); 3033 out_err: 3034 xs_xprt_free(xprt); 3035 return ret; 3036 } 3037 3038 static const struct rpc_timeout xs_tcp_default_timeout = { 3039 .to_initval = 60 * HZ, 3040 .to_maxval = 60 * HZ, 3041 .to_retries = 2, 3042 }; 3043 3044 /** 3045 * xs_setup_tcp - Set up transport to use a TCP socket 3046 * @args: rpc transport creation arguments 3047 * 3048 */ 3049 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 3050 { 3051 struct sockaddr *addr = args->dstaddr; 3052 struct rpc_xprt *xprt; 3053 struct sock_xprt *transport; 3054 struct rpc_xprt *ret; 3055 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 3056 3057 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 3058 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 3059 3060 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3061 max_slot_table_size); 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->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 3068 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3069 3070 xprt->bind_timeout = XS_BIND_TO; 3071 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 3072 xprt->idle_timeout = XS_IDLE_DISC_TO; 3073 3074 xprt->ops = &xs_tcp_ops; 3075 xprt->timeout = &xs_tcp_default_timeout; 3076 3077 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 3078 xprt->connect_timeout = xprt->timeout->to_initval * 3079 (xprt->timeout->to_retries + 1); 3080 3081 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn); 3082 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 3083 3084 switch (addr->sa_family) { 3085 case AF_INET: 3086 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3087 xprt_set_bound(xprt); 3088 3089 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 3090 break; 3091 case AF_INET6: 3092 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3093 xprt_set_bound(xprt); 3094 3095 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 3096 break; 3097 default: 3098 ret = ERR_PTR(-EAFNOSUPPORT); 3099 goto out_err; 3100 } 3101 3102 if (xprt_bound(xprt)) 3103 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3104 xprt->address_strings[RPC_DISPLAY_ADDR], 3105 xprt->address_strings[RPC_DISPLAY_PORT], 3106 xprt->address_strings[RPC_DISPLAY_PROTO]); 3107 else 3108 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3109 xprt->address_strings[RPC_DISPLAY_ADDR], 3110 xprt->address_strings[RPC_DISPLAY_PROTO]); 3111 3112 if (try_module_get(THIS_MODULE)) 3113 return xprt; 3114 ret = ERR_PTR(-EINVAL); 3115 out_err: 3116 xs_xprt_free(xprt); 3117 return ret; 3118 } 3119 3120 /** 3121 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 3122 * @args: rpc transport creation arguments 3123 * 3124 */ 3125 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 3126 { 3127 struct sockaddr *addr = args->dstaddr; 3128 struct rpc_xprt *xprt; 3129 struct sock_xprt *transport; 3130 struct svc_sock *bc_sock; 3131 struct rpc_xprt *ret; 3132 3133 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3134 xprt_tcp_slot_table_entries); 3135 if (IS_ERR(xprt)) 3136 return xprt; 3137 transport = container_of(xprt, struct sock_xprt, xprt); 3138 3139 xprt->prot = IPPROTO_TCP; 3140 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 3141 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3142 xprt->timeout = &xs_tcp_default_timeout; 3143 3144 /* backchannel */ 3145 xprt_set_bound(xprt); 3146 xprt->bind_timeout = 0; 3147 xprt->reestablish_timeout = 0; 3148 xprt->idle_timeout = 0; 3149 3150 xprt->ops = &bc_tcp_ops; 3151 3152 switch (addr->sa_family) { 3153 case AF_INET: 3154 xs_format_peer_addresses(xprt, "tcp", 3155 RPCBIND_NETID_TCP); 3156 break; 3157 case AF_INET6: 3158 xs_format_peer_addresses(xprt, "tcp", 3159 RPCBIND_NETID_TCP6); 3160 break; 3161 default: 3162 ret = ERR_PTR(-EAFNOSUPPORT); 3163 goto out_err; 3164 } 3165 3166 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3167 xprt->address_strings[RPC_DISPLAY_ADDR], 3168 xprt->address_strings[RPC_DISPLAY_PORT], 3169 xprt->address_strings[RPC_DISPLAY_PROTO]); 3170 3171 /* 3172 * Once we've associated a backchannel xprt with a connection, 3173 * we want to keep it around as long as the connection lasts, 3174 * in case we need to start using it for a backchannel again; 3175 * this reference won't be dropped until bc_xprt is destroyed. 3176 */ 3177 xprt_get(xprt); 3178 args->bc_xprt->xpt_bc_xprt = xprt; 3179 xprt->bc_xprt = args->bc_xprt; 3180 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3181 transport->sock = bc_sock->sk_sock; 3182 transport->inet = bc_sock->sk_sk; 3183 3184 /* 3185 * Since we don't want connections for the backchannel, we set 3186 * the xprt status to connected 3187 */ 3188 xprt_set_connected(xprt); 3189 3190 if (try_module_get(THIS_MODULE)) 3191 return xprt; 3192 3193 args->bc_xprt->xpt_bc_xprt = NULL; 3194 args->bc_xprt->xpt_bc_xps = NULL; 3195 xprt_put(xprt); 3196 ret = ERR_PTR(-EINVAL); 3197 out_err: 3198 xs_xprt_free(xprt); 3199 return ret; 3200 } 3201 3202 static struct xprt_class xs_local_transport = { 3203 .list = LIST_HEAD_INIT(xs_local_transport.list), 3204 .name = "named UNIX socket", 3205 .owner = THIS_MODULE, 3206 .ident = XPRT_TRANSPORT_LOCAL, 3207 .setup = xs_setup_local, 3208 }; 3209 3210 static struct xprt_class xs_udp_transport = { 3211 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3212 .name = "udp", 3213 .owner = THIS_MODULE, 3214 .ident = XPRT_TRANSPORT_UDP, 3215 .setup = xs_setup_udp, 3216 }; 3217 3218 static struct xprt_class xs_tcp_transport = { 3219 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3220 .name = "tcp", 3221 .owner = THIS_MODULE, 3222 .ident = XPRT_TRANSPORT_TCP, 3223 .setup = xs_setup_tcp, 3224 }; 3225 3226 static struct xprt_class xs_bc_tcp_transport = { 3227 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3228 .name = "tcp NFSv4.1 backchannel", 3229 .owner = THIS_MODULE, 3230 .ident = XPRT_TRANSPORT_BC_TCP, 3231 .setup = xs_setup_bc_tcp, 3232 }; 3233 3234 /** 3235 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3236 * 3237 */ 3238 int init_socket_xprt(void) 3239 { 3240 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3241 if (!sunrpc_table_header) 3242 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3243 #endif 3244 3245 xprt_register_transport(&xs_local_transport); 3246 xprt_register_transport(&xs_udp_transport); 3247 xprt_register_transport(&xs_tcp_transport); 3248 xprt_register_transport(&xs_bc_tcp_transport); 3249 3250 return 0; 3251 } 3252 3253 /** 3254 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3255 * 3256 */ 3257 void cleanup_socket_xprt(void) 3258 { 3259 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3260 if (sunrpc_table_header) { 3261 unregister_sysctl_table(sunrpc_table_header); 3262 sunrpc_table_header = NULL; 3263 } 3264 #endif 3265 3266 xprt_unregister_transport(&xs_local_transport); 3267 xprt_unregister_transport(&xs_udp_transport); 3268 xprt_unregister_transport(&xs_tcp_transport); 3269 xprt_unregister_transport(&xs_bc_tcp_transport); 3270 } 3271 3272 static int param_set_uint_minmax(const char *val, 3273 const struct kernel_param *kp, 3274 unsigned int min, unsigned int max) 3275 { 3276 unsigned int num; 3277 int ret; 3278 3279 if (!val) 3280 return -EINVAL; 3281 ret = kstrtouint(val, 0, &num); 3282 if (ret) 3283 return ret; 3284 if (num < min || num > max) 3285 return -EINVAL; 3286 *((unsigned int *)kp->arg) = num; 3287 return 0; 3288 } 3289 3290 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3291 { 3292 if (kp->arg == &xprt_min_resvport) 3293 return param_set_uint_minmax(val, kp, 3294 RPC_MIN_RESVPORT, 3295 xprt_max_resvport); 3296 return param_set_uint_minmax(val, kp, 3297 xprt_min_resvport, 3298 RPC_MAX_RESVPORT); 3299 } 3300 3301 static const struct kernel_param_ops param_ops_portnr = { 3302 .set = param_set_portnr, 3303 .get = param_get_uint, 3304 }; 3305 3306 #define param_check_portnr(name, p) \ 3307 __param_check(name, p, unsigned int); 3308 3309 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3310 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3311 3312 static int param_set_slot_table_size(const char *val, 3313 const struct kernel_param *kp) 3314 { 3315 return param_set_uint_minmax(val, kp, 3316 RPC_MIN_SLOT_TABLE, 3317 RPC_MAX_SLOT_TABLE); 3318 } 3319 3320 static const struct kernel_param_ops param_ops_slot_table_size = { 3321 .set = param_set_slot_table_size, 3322 .get = param_get_uint, 3323 }; 3324 3325 #define param_check_slot_table_size(name, p) \ 3326 __param_check(name, p, unsigned int); 3327 3328 static int param_set_max_slot_table_size(const char *val, 3329 const struct kernel_param *kp) 3330 { 3331 return param_set_uint_minmax(val, kp, 3332 RPC_MIN_SLOT_TABLE, 3333 RPC_MAX_SLOT_TABLE_LIMIT); 3334 } 3335 3336 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3337 .set = param_set_max_slot_table_size, 3338 .get = param_get_uint, 3339 }; 3340 3341 #define param_check_max_slot_table_size(name, p) \ 3342 __param_check(name, p, unsigned int); 3343 3344 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3345 slot_table_size, 0644); 3346 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3347 max_slot_table_size, 0644); 3348 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3349 slot_table_size, 0644); 3350 3351