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 case -EPIPE: 556 xs_close(xprt); 557 status = -ENOTCONN; 558 } 559 560 return status; 561 } 562 563 /** 564 * xs_udp_send_request - write an RPC request to a UDP socket 565 * @task: address of RPC task that manages the state of an RPC request 566 * 567 * Return values: 568 * 0: The request has been sent 569 * EAGAIN: The socket was blocked, please call again later to 570 * complete the request 571 * ENOTCONN: Caller needs to invoke connect logic then call again 572 * other: Some other error occurred, the request was not sent 573 */ 574 static int xs_udp_send_request(struct rpc_task *task) 575 { 576 struct rpc_rqst *req = task->tk_rqstp; 577 struct rpc_xprt *xprt = req->rq_xprt; 578 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 579 struct xdr_buf *xdr = &req->rq_snd_buf; 580 int sent = 0; 581 int status; 582 583 xs_pktdump("packet data:", 584 req->rq_svec->iov_base, 585 req->rq_svec->iov_len); 586 587 if (!xprt_bound(xprt)) 588 return -ENOTCONN; 589 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, 590 xdr, req->rq_bytes_sent, true, &sent); 591 592 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 593 xdr->len - req->rq_bytes_sent, status); 594 595 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 596 if (status == -EPERM) 597 goto process_status; 598 599 if (status == -EAGAIN && sock_writeable(transport->inet)) 600 status = -ENOBUFS; 601 602 if (sent > 0 || status == 0) { 603 req->rq_xmit_bytes_sent += sent; 604 if (sent >= req->rq_slen) 605 return 0; 606 /* Still some bytes left; set up for a retry later. */ 607 status = -EAGAIN; 608 } 609 610 process_status: 611 switch (status) { 612 case -ENOTSOCK: 613 status = -ENOTCONN; 614 /* Should we call xs_close() here? */ 615 break; 616 case -EAGAIN: 617 status = xs_nospace(task); 618 break; 619 case -ENETUNREACH: 620 case -ENOBUFS: 621 case -EPIPE: 622 case -ECONNREFUSED: 623 case -EPERM: 624 /* When the server has died, an ICMP port unreachable message 625 * prompts ECONNREFUSED. */ 626 break; 627 default: 628 dprintk("RPC: sendmsg returned unrecognized error %d\n", 629 -status); 630 } 631 632 return status; 633 } 634 635 /** 636 * xs_tcp_send_request - write an RPC request to a TCP socket 637 * @task: address of RPC task that manages the state of an RPC request 638 * 639 * Return values: 640 * 0: The request has been sent 641 * EAGAIN: The socket was blocked, please call again later to 642 * complete the request 643 * ENOTCONN: Caller needs to invoke connect logic then call again 644 * other: Some other error occurred, the request was not sent 645 * 646 * XXX: In the case of soft timeouts, should we eventually give up 647 * if sendmsg is not able to make progress? 648 */ 649 static int xs_tcp_send_request(struct rpc_task *task) 650 { 651 struct rpc_rqst *req = task->tk_rqstp; 652 struct rpc_xprt *xprt = req->rq_xprt; 653 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 654 struct xdr_buf *xdr = &req->rq_snd_buf; 655 bool zerocopy = true; 656 bool vm_wait = false; 657 int status; 658 int sent; 659 660 xs_encode_stream_record_marker(&req->rq_snd_buf); 661 662 xs_pktdump("packet data:", 663 req->rq_svec->iov_base, 664 req->rq_svec->iov_len); 665 /* Don't use zero copy if this is a resend. If the RPC call 666 * completes while the socket holds a reference to the pages, 667 * then we may end up resending corrupted data. 668 */ 669 if (task->tk_flags & RPC_TASK_SENT) 670 zerocopy = false; 671 672 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) 673 xs_tcp_set_socket_timeouts(xprt, transport->sock); 674 675 /* Continue transmitting the packet/record. We must be careful 676 * to cope with writespace callbacks arriving _after_ we have 677 * called sendmsg(). */ 678 while (1) { 679 sent = 0; 680 status = xs_sendpages(transport->sock, NULL, 0, xdr, 681 req->rq_bytes_sent, zerocopy, &sent); 682 683 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 684 xdr->len - req->rq_bytes_sent, status); 685 686 /* If we've sent the entire packet, immediately 687 * reset the count of bytes sent. */ 688 req->rq_bytes_sent += sent; 689 req->rq_xmit_bytes_sent += sent; 690 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 691 req->rq_bytes_sent = 0; 692 return 0; 693 } 694 695 WARN_ON_ONCE(sent == 0 && status == 0); 696 697 if (status == -EAGAIN ) { 698 /* 699 * Return EAGAIN if we're sure we're hitting the 700 * socket send buffer limits. 701 */ 702 if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) 703 break; 704 /* 705 * Did we hit a memory allocation failure? 706 */ 707 if (sent == 0) { 708 status = -ENOBUFS; 709 if (vm_wait) 710 break; 711 /* Retry, knowing now that we're below the 712 * socket send buffer limit 713 */ 714 vm_wait = true; 715 } 716 continue; 717 } 718 if (status < 0) 719 break; 720 vm_wait = false; 721 } 722 723 switch (status) { 724 case -ENOTSOCK: 725 status = -ENOTCONN; 726 /* Should we call xs_close() here? */ 727 break; 728 case -EAGAIN: 729 status = xs_nospace(task); 730 break; 731 case -ECONNRESET: 732 case -ECONNREFUSED: 733 case -ENOTCONN: 734 case -EADDRINUSE: 735 case -ENOBUFS: 736 case -EPIPE: 737 break; 738 default: 739 dprintk("RPC: sendmsg returned unrecognized error %d\n", 740 -status); 741 } 742 743 return status; 744 } 745 746 /** 747 * xs_tcp_release_xprt - clean up after a tcp transmission 748 * @xprt: transport 749 * @task: rpc task 750 * 751 * This cleans up if an error causes us to abort the transmission of a request. 752 * In this case, the socket may need to be reset in order to avoid confusing 753 * the server. 754 */ 755 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 756 { 757 struct rpc_rqst *req; 758 759 if (task != xprt->snd_task) 760 return; 761 if (task == NULL) 762 goto out_release; 763 req = task->tk_rqstp; 764 if (req == NULL) 765 goto out_release; 766 if (req->rq_bytes_sent == 0) 767 goto out_release; 768 if (req->rq_bytes_sent == req->rq_snd_buf.len) 769 goto out_release; 770 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 771 out_release: 772 xprt_release_xprt(xprt, task); 773 } 774 775 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 776 { 777 transport->old_data_ready = sk->sk_data_ready; 778 transport->old_state_change = sk->sk_state_change; 779 transport->old_write_space = sk->sk_write_space; 780 transport->old_error_report = sk->sk_error_report; 781 } 782 783 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 784 { 785 sk->sk_data_ready = transport->old_data_ready; 786 sk->sk_state_change = transport->old_state_change; 787 sk->sk_write_space = transport->old_write_space; 788 sk->sk_error_report = transport->old_error_report; 789 } 790 791 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 792 { 793 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 794 795 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 796 } 797 798 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 799 { 800 smp_mb__before_atomic(); 801 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 802 clear_bit(XPRT_CLOSING, &xprt->state); 803 xs_sock_reset_state_flags(xprt); 804 smp_mb__after_atomic(); 805 } 806 807 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 808 { 809 xs_sock_reset_connection_flags(xprt); 810 /* Mark transport as closed and wake up all pending tasks */ 811 xprt_disconnect_done(xprt); 812 } 813 814 /** 815 * xs_error_report - callback to handle TCP socket state errors 816 * @sk: socket 817 * 818 * Note: we don't call sock_error() since there may be a rpc_task 819 * using the socket, and so we don't want to clear sk->sk_err. 820 */ 821 static void xs_error_report(struct sock *sk) 822 { 823 struct rpc_xprt *xprt; 824 int err; 825 826 read_lock_bh(&sk->sk_callback_lock); 827 if (!(xprt = xprt_from_sock(sk))) 828 goto out; 829 830 err = -sk->sk_err; 831 if (err == 0) 832 goto out; 833 /* Is this a reset event? */ 834 if (sk->sk_state == TCP_CLOSE) 835 xs_sock_mark_closed(xprt); 836 dprintk("RPC: xs_error_report client %p, error=%d...\n", 837 xprt, -err); 838 trace_rpc_socket_error(xprt, sk->sk_socket, err); 839 xprt_wake_pending_tasks(xprt, err); 840 out: 841 read_unlock_bh(&sk->sk_callback_lock); 842 } 843 844 static void xs_reset_transport(struct sock_xprt *transport) 845 { 846 struct socket *sock = transport->sock; 847 struct sock *sk = transport->inet; 848 struct rpc_xprt *xprt = &transport->xprt; 849 850 if (sk == NULL) 851 return; 852 853 if (atomic_read(&transport->xprt.swapper)) 854 sk_clear_memalloc(sk); 855 856 kernel_sock_shutdown(sock, SHUT_RDWR); 857 858 mutex_lock(&transport->recv_mutex); 859 write_lock_bh(&sk->sk_callback_lock); 860 transport->inet = NULL; 861 transport->sock = NULL; 862 863 sk->sk_user_data = NULL; 864 865 xs_restore_old_callbacks(transport, sk); 866 xprt_clear_connected(xprt); 867 write_unlock_bh(&sk->sk_callback_lock); 868 xs_sock_reset_connection_flags(xprt); 869 mutex_unlock(&transport->recv_mutex); 870 871 trace_rpc_socket_close(xprt, sock); 872 sock_release(sock); 873 } 874 875 /** 876 * xs_close - close a socket 877 * @xprt: transport 878 * 879 * This is used when all requests are complete; ie, no DRC state remains 880 * on the server we want to save. 881 * 882 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 883 * xs_reset_transport() zeroing the socket from underneath a writer. 884 */ 885 static void xs_close(struct rpc_xprt *xprt) 886 { 887 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 888 889 dprintk("RPC: xs_close xprt %p\n", xprt); 890 891 xs_reset_transport(transport); 892 xprt->reestablish_timeout = 0; 893 894 xprt_disconnect_done(xprt); 895 } 896 897 static void xs_inject_disconnect(struct rpc_xprt *xprt) 898 { 899 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 900 xprt); 901 xprt_disconnect_done(xprt); 902 } 903 904 static void xs_xprt_free(struct rpc_xprt *xprt) 905 { 906 xs_free_peer_addresses(xprt); 907 xprt_free(xprt); 908 } 909 910 /** 911 * xs_destroy - prepare to shutdown a transport 912 * @xprt: doomed transport 913 * 914 */ 915 static void xs_destroy(struct rpc_xprt *xprt) 916 { 917 struct sock_xprt *transport = container_of(xprt, 918 struct sock_xprt, xprt); 919 dprintk("RPC: xs_destroy xprt %p\n", xprt); 920 921 cancel_delayed_work_sync(&transport->connect_worker); 922 xs_close(xprt); 923 cancel_work_sync(&transport->recv_worker); 924 xs_xprt_free(xprt); 925 module_put(THIS_MODULE); 926 } 927 928 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 929 { 930 struct xdr_skb_reader desc = { 931 .skb = skb, 932 .offset = sizeof(rpc_fraghdr), 933 .count = skb->len - sizeof(rpc_fraghdr), 934 }; 935 936 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 937 return -1; 938 if (desc.count) 939 return -1; 940 return 0; 941 } 942 943 /** 944 * xs_local_data_read_skb 945 * @xprt: transport 946 * @sk: socket 947 * @skb: skbuff 948 * 949 * Currently this assumes we can read the whole reply in a single gulp. 950 */ 951 static void xs_local_data_read_skb(struct rpc_xprt *xprt, 952 struct sock *sk, 953 struct sk_buff *skb) 954 { 955 struct rpc_task *task; 956 struct rpc_rqst *rovr; 957 int repsize, copied; 958 u32 _xid; 959 __be32 *xp; 960 961 repsize = skb->len - sizeof(rpc_fraghdr); 962 if (repsize < 4) { 963 dprintk("RPC: impossible RPC reply size %d\n", repsize); 964 return; 965 } 966 967 /* Copy the XID from the skb... */ 968 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 969 if (xp == NULL) 970 return; 971 972 /* Look up and lock the request corresponding to the given XID */ 973 spin_lock(&xprt->recv_lock); 974 rovr = xprt_lookup_rqst(xprt, *xp); 975 if (!rovr) 976 goto out_unlock; 977 xprt_pin_rqst(rovr); 978 spin_unlock(&xprt->recv_lock); 979 task = rovr->rq_task; 980 981 copied = rovr->rq_private_buf.buflen; 982 if (copied > repsize) 983 copied = repsize; 984 985 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 986 dprintk("RPC: sk_buff copy failed\n"); 987 spin_lock(&xprt->recv_lock); 988 goto out_unpin; 989 } 990 991 spin_lock(&xprt->recv_lock); 992 xprt_complete_rqst(task, copied); 993 out_unpin: 994 xprt_unpin_rqst(rovr); 995 out_unlock: 996 spin_unlock(&xprt->recv_lock); 997 } 998 999 static void xs_local_data_receive(struct sock_xprt *transport) 1000 { 1001 struct sk_buff *skb; 1002 struct sock *sk; 1003 int err; 1004 1005 mutex_lock(&transport->recv_mutex); 1006 sk = transport->inet; 1007 if (sk == NULL) 1008 goto out; 1009 for (;;) { 1010 skb = skb_recv_datagram(sk, 0, 1, &err); 1011 if (skb != NULL) { 1012 xs_local_data_read_skb(&transport->xprt, sk, skb); 1013 skb_free_datagram(sk, skb); 1014 continue; 1015 } 1016 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1017 break; 1018 } 1019 out: 1020 mutex_unlock(&transport->recv_mutex); 1021 } 1022 1023 static void xs_local_data_receive_workfn(struct work_struct *work) 1024 { 1025 struct sock_xprt *transport = 1026 container_of(work, struct sock_xprt, recv_worker); 1027 xs_local_data_receive(transport); 1028 } 1029 1030 /** 1031 * xs_udp_data_read_skb - receive callback for UDP sockets 1032 * @xprt: transport 1033 * @sk: socket 1034 * @skb: skbuff 1035 * 1036 */ 1037 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 1038 struct sock *sk, 1039 struct sk_buff *skb) 1040 { 1041 struct rpc_task *task; 1042 struct rpc_rqst *rovr; 1043 int repsize, copied; 1044 u32 _xid; 1045 __be32 *xp; 1046 1047 repsize = skb->len; 1048 if (repsize < 4) { 1049 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1050 return; 1051 } 1052 1053 /* Copy the XID from the skb... */ 1054 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1055 if (xp == NULL) 1056 return; 1057 1058 /* Look up and lock the request corresponding to the given XID */ 1059 spin_lock(&xprt->recv_lock); 1060 rovr = xprt_lookup_rqst(xprt, *xp); 1061 if (!rovr) 1062 goto out_unlock; 1063 xprt_pin_rqst(rovr); 1064 spin_unlock(&xprt->recv_lock); 1065 task = rovr->rq_task; 1066 1067 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1068 copied = repsize; 1069 1070 /* Suck it into the iovec, verify checksum if not done by hw. */ 1071 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1072 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1073 spin_lock(&xprt->recv_lock); 1074 goto out_unpin; 1075 } 1076 1077 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1078 1079 spin_lock_bh(&xprt->transport_lock); 1080 xprt_adjust_cwnd(xprt, task, copied); 1081 spin_unlock_bh(&xprt->transport_lock); 1082 spin_lock(&xprt->recv_lock); 1083 xprt_complete_rqst(task, copied); 1084 out_unpin: 1085 xprt_unpin_rqst(rovr); 1086 out_unlock: 1087 spin_unlock(&xprt->recv_lock); 1088 } 1089 1090 static void xs_udp_data_receive(struct sock_xprt *transport) 1091 { 1092 struct sk_buff *skb; 1093 struct sock *sk; 1094 int err; 1095 1096 mutex_lock(&transport->recv_mutex); 1097 sk = transport->inet; 1098 if (sk == NULL) 1099 goto out; 1100 for (;;) { 1101 skb = skb_recv_udp(sk, 0, 1, &err); 1102 if (skb != NULL) { 1103 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1104 consume_skb(skb); 1105 continue; 1106 } 1107 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1108 break; 1109 } 1110 out: 1111 mutex_unlock(&transport->recv_mutex); 1112 } 1113 1114 static void xs_udp_data_receive_workfn(struct work_struct *work) 1115 { 1116 struct sock_xprt *transport = 1117 container_of(work, struct sock_xprt, recv_worker); 1118 xs_udp_data_receive(transport); 1119 } 1120 1121 /** 1122 * xs_data_ready - "data ready" callback for UDP sockets 1123 * @sk: socket with data to read 1124 * 1125 */ 1126 static void xs_data_ready(struct sock *sk) 1127 { 1128 struct rpc_xprt *xprt; 1129 1130 read_lock_bh(&sk->sk_callback_lock); 1131 dprintk("RPC: xs_data_ready...\n"); 1132 xprt = xprt_from_sock(sk); 1133 if (xprt != NULL) { 1134 struct sock_xprt *transport = container_of(xprt, 1135 struct sock_xprt, xprt); 1136 transport->old_data_ready(sk); 1137 /* Any data means we had a useful conversation, so 1138 * then we don't need to delay the next reconnect 1139 */ 1140 if (xprt->reestablish_timeout) 1141 xprt->reestablish_timeout = 0; 1142 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1143 queue_work(xprtiod_workqueue, &transport->recv_worker); 1144 } 1145 read_unlock_bh(&sk->sk_callback_lock); 1146 } 1147 1148 /* 1149 * Helper function to force a TCP close if the server is sending 1150 * junk and/or it has put us in CLOSE_WAIT 1151 */ 1152 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1153 { 1154 xprt_force_disconnect(xprt); 1155 } 1156 1157 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1158 { 1159 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1160 size_t len, used; 1161 char *p; 1162 1163 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1164 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1165 used = xdr_skb_read_bits(desc, p, len); 1166 transport->tcp_offset += used; 1167 if (used != len) 1168 return; 1169 1170 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1171 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1172 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1173 else 1174 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1175 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1176 1177 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1178 transport->tcp_offset = 0; 1179 1180 /* Sanity check of the record length */ 1181 if (unlikely(transport->tcp_reclen < 8)) { 1182 dprintk("RPC: invalid TCP record fragment length\n"); 1183 xs_tcp_force_close(xprt); 1184 return; 1185 } 1186 dprintk("RPC: reading TCP record fragment of length %d\n", 1187 transport->tcp_reclen); 1188 } 1189 1190 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1191 { 1192 if (transport->tcp_offset == transport->tcp_reclen) { 1193 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1194 transport->tcp_offset = 0; 1195 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1196 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1197 transport->tcp_flags |= TCP_RCV_COPY_XID; 1198 transport->tcp_copied = 0; 1199 } 1200 } 1201 } 1202 1203 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1204 { 1205 size_t len, used; 1206 char *p; 1207 1208 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1209 dprintk("RPC: reading XID (%zu bytes)\n", len); 1210 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1211 used = xdr_skb_read_bits(desc, p, len); 1212 transport->tcp_offset += used; 1213 if (used != len) 1214 return; 1215 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1216 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1217 transport->tcp_copied = 4; 1218 dprintk("RPC: reading %s XID %08x\n", 1219 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1220 : "request with", 1221 ntohl(transport->tcp_xid)); 1222 xs_tcp_check_fraghdr(transport); 1223 } 1224 1225 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1226 struct xdr_skb_reader *desc) 1227 { 1228 size_t len, used; 1229 u32 offset; 1230 char *p; 1231 1232 /* 1233 * We want transport->tcp_offset to be 8 at the end of this routine 1234 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1235 * When this function is called for the first time, 1236 * transport->tcp_offset is 4 (after having already read the xid). 1237 */ 1238 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1239 len = sizeof(transport->tcp_calldir) - offset; 1240 dprintk("RPC: reading CALL/REPLY flag (%zu bytes)\n", len); 1241 p = ((char *) &transport->tcp_calldir) + offset; 1242 used = xdr_skb_read_bits(desc, p, len); 1243 transport->tcp_offset += used; 1244 if (used != len) 1245 return; 1246 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1247 /* 1248 * We don't yet have the XDR buffer, so we will write the calldir 1249 * out after we get the buffer from the 'struct rpc_rqst' 1250 */ 1251 switch (ntohl(transport->tcp_calldir)) { 1252 case RPC_REPLY: 1253 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1254 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1255 transport->tcp_flags |= TCP_RPC_REPLY; 1256 break; 1257 case RPC_CALL: 1258 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1259 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1260 transport->tcp_flags &= ~TCP_RPC_REPLY; 1261 break; 1262 default: 1263 dprintk("RPC: invalid request message type\n"); 1264 xs_tcp_force_close(&transport->xprt); 1265 } 1266 xs_tcp_check_fraghdr(transport); 1267 } 1268 1269 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1270 struct xdr_skb_reader *desc, 1271 struct rpc_rqst *req) 1272 { 1273 struct sock_xprt *transport = 1274 container_of(xprt, struct sock_xprt, xprt); 1275 struct xdr_buf *rcvbuf; 1276 size_t len; 1277 ssize_t r; 1278 1279 rcvbuf = &req->rq_private_buf; 1280 1281 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1282 /* 1283 * Save the RPC direction in the XDR buffer 1284 */ 1285 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1286 &transport->tcp_calldir, 1287 sizeof(transport->tcp_calldir)); 1288 transport->tcp_copied += sizeof(transport->tcp_calldir); 1289 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1290 } 1291 1292 len = desc->count; 1293 if (len > transport->tcp_reclen - transport->tcp_offset) 1294 desc->count = transport->tcp_reclen - transport->tcp_offset; 1295 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1296 desc, xdr_skb_read_bits); 1297 1298 if (desc->count) { 1299 /* Error when copying to the receive buffer, 1300 * usually because we weren't able to allocate 1301 * additional buffer pages. All we can do now 1302 * is turn off TCP_RCV_COPY_DATA, so the request 1303 * will not receive any additional updates, 1304 * and time out. 1305 * Any remaining data from this record will 1306 * be discarded. 1307 */ 1308 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1309 dprintk("RPC: XID %08x truncated request\n", 1310 ntohl(transport->tcp_xid)); 1311 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1312 "tcp_offset = %u, tcp_reclen = %u\n", 1313 xprt, transport->tcp_copied, 1314 transport->tcp_offset, transport->tcp_reclen); 1315 return; 1316 } 1317 1318 transport->tcp_copied += r; 1319 transport->tcp_offset += r; 1320 desc->count = len - r; 1321 1322 dprintk("RPC: XID %08x read %zd bytes\n", 1323 ntohl(transport->tcp_xid), r); 1324 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1325 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1326 transport->tcp_offset, transport->tcp_reclen); 1327 1328 if (transport->tcp_copied == req->rq_private_buf.buflen) 1329 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1330 else if (transport->tcp_offset == transport->tcp_reclen) { 1331 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1332 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1333 } 1334 } 1335 1336 /* 1337 * Finds the request corresponding to the RPC xid and invokes the common 1338 * tcp read code to read the data. 1339 */ 1340 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1341 struct xdr_skb_reader *desc) 1342 { 1343 struct sock_xprt *transport = 1344 container_of(xprt, struct sock_xprt, xprt); 1345 struct rpc_rqst *req; 1346 1347 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1348 1349 /* Find and lock the request corresponding to this xid */ 1350 spin_lock(&xprt->recv_lock); 1351 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1352 if (!req) { 1353 dprintk("RPC: XID %08x request not found!\n", 1354 ntohl(transport->tcp_xid)); 1355 spin_unlock(&xprt->recv_lock); 1356 return -1; 1357 } 1358 xprt_pin_rqst(req); 1359 spin_unlock(&xprt->recv_lock); 1360 1361 xs_tcp_read_common(xprt, desc, req); 1362 1363 spin_lock(&xprt->recv_lock); 1364 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1365 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1366 xprt_unpin_rqst(req); 1367 spin_unlock(&xprt->recv_lock); 1368 return 0; 1369 } 1370 1371 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1372 /* 1373 * Obtains an rpc_rqst previously allocated and invokes the common 1374 * tcp read code to read the data. The result is placed in the callback 1375 * queue. 1376 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1377 * connection and return -1. 1378 */ 1379 static int xs_tcp_read_callback(struct rpc_xprt *xprt, 1380 struct xdr_skb_reader *desc) 1381 { 1382 struct sock_xprt *transport = 1383 container_of(xprt, struct sock_xprt, xprt); 1384 struct rpc_rqst *req; 1385 1386 /* Look up the request corresponding to the given XID */ 1387 req = xprt_lookup_bc_request(xprt, transport->tcp_xid); 1388 if (req == NULL) { 1389 printk(KERN_WARNING "Callback slot table overflowed\n"); 1390 xprt_force_disconnect(xprt); 1391 return -1; 1392 } 1393 1394 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1395 xs_tcp_read_common(xprt, desc, req); 1396 1397 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1398 xprt_complete_bc_request(req, transport->tcp_copied); 1399 1400 return 0; 1401 } 1402 1403 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1404 struct xdr_skb_reader *desc) 1405 { 1406 struct sock_xprt *transport = 1407 container_of(xprt, struct sock_xprt, xprt); 1408 1409 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1410 xs_tcp_read_reply(xprt, desc) : 1411 xs_tcp_read_callback(xprt, desc); 1412 } 1413 1414 static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net) 1415 { 1416 int ret; 1417 1418 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0, 1419 SVC_SOCK_ANONYMOUS); 1420 if (ret < 0) 1421 return ret; 1422 return 0; 1423 } 1424 1425 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) 1426 { 1427 return PAGE_SIZE; 1428 } 1429 #else 1430 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1431 struct xdr_skb_reader *desc) 1432 { 1433 return xs_tcp_read_reply(xprt, desc); 1434 } 1435 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1436 1437 /* 1438 * Read data off the transport. This can be either an RPC_CALL or an 1439 * RPC_REPLY. Relay the processing to helper functions. 1440 */ 1441 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1442 struct xdr_skb_reader *desc) 1443 { 1444 struct sock_xprt *transport = 1445 container_of(xprt, struct sock_xprt, xprt); 1446 1447 if (_xs_tcp_read_data(xprt, desc) == 0) 1448 xs_tcp_check_fraghdr(transport); 1449 else { 1450 /* 1451 * The transport_lock protects the request handling. 1452 * There's no need to hold it to update the tcp_flags. 1453 */ 1454 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1455 } 1456 } 1457 1458 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1459 { 1460 size_t len; 1461 1462 len = transport->tcp_reclen - transport->tcp_offset; 1463 if (len > desc->count) 1464 len = desc->count; 1465 desc->count -= len; 1466 desc->offset += len; 1467 transport->tcp_offset += len; 1468 dprintk("RPC: discarded %zu bytes\n", len); 1469 xs_tcp_check_fraghdr(transport); 1470 } 1471 1472 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1473 { 1474 struct rpc_xprt *xprt = rd_desc->arg.data; 1475 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1476 struct xdr_skb_reader desc = { 1477 .skb = skb, 1478 .offset = offset, 1479 .count = len, 1480 }; 1481 1482 dprintk("RPC: xs_tcp_data_recv started\n"); 1483 do { 1484 trace_xs_tcp_data_recv(transport); 1485 /* Read in a new fragment marker if necessary */ 1486 /* Can we ever really expect to get completely empty fragments? */ 1487 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1488 xs_tcp_read_fraghdr(xprt, &desc); 1489 continue; 1490 } 1491 /* Read in the xid if necessary */ 1492 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1493 xs_tcp_read_xid(transport, &desc); 1494 continue; 1495 } 1496 /* Read in the call/reply flag */ 1497 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1498 xs_tcp_read_calldir(transport, &desc); 1499 continue; 1500 } 1501 /* Read in the request data */ 1502 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1503 xs_tcp_read_data(xprt, &desc); 1504 continue; 1505 } 1506 /* Skip over any trailing bytes on short reads */ 1507 xs_tcp_read_discard(transport, &desc); 1508 } while (desc.count); 1509 trace_xs_tcp_data_recv(transport); 1510 dprintk("RPC: xs_tcp_data_recv done\n"); 1511 return len - desc.count; 1512 } 1513 1514 static void xs_tcp_data_receive(struct sock_xprt *transport) 1515 { 1516 struct rpc_xprt *xprt = &transport->xprt; 1517 struct sock *sk; 1518 read_descriptor_t rd_desc = { 1519 .count = 2*1024*1024, 1520 .arg.data = xprt, 1521 }; 1522 unsigned long total = 0; 1523 int loop; 1524 int read = 0; 1525 1526 mutex_lock(&transport->recv_mutex); 1527 sk = transport->inet; 1528 if (sk == NULL) 1529 goto out; 1530 1531 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1532 for (loop = 0; loop < 64; loop++) { 1533 lock_sock(sk); 1534 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1535 if (read <= 0) { 1536 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 1537 release_sock(sk); 1538 break; 1539 } 1540 release_sock(sk); 1541 total += read; 1542 rd_desc.count = 65536; 1543 } 1544 if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1545 queue_work(xprtiod_workqueue, &transport->recv_worker); 1546 out: 1547 mutex_unlock(&transport->recv_mutex); 1548 trace_xs_tcp_data_ready(xprt, read, total); 1549 } 1550 1551 static void xs_tcp_data_receive_workfn(struct work_struct *work) 1552 { 1553 struct sock_xprt *transport = 1554 container_of(work, struct sock_xprt, recv_worker); 1555 xs_tcp_data_receive(transport); 1556 } 1557 1558 /** 1559 * xs_tcp_state_change - callback to handle TCP socket state changes 1560 * @sk: socket whose state has changed 1561 * 1562 */ 1563 static void xs_tcp_state_change(struct sock *sk) 1564 { 1565 struct rpc_xprt *xprt; 1566 struct sock_xprt *transport; 1567 1568 read_lock_bh(&sk->sk_callback_lock); 1569 if (!(xprt = xprt_from_sock(sk))) 1570 goto out; 1571 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1572 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1573 sk->sk_state, xprt_connected(xprt), 1574 sock_flag(sk, SOCK_DEAD), 1575 sock_flag(sk, SOCK_ZAPPED), 1576 sk->sk_shutdown); 1577 1578 transport = container_of(xprt, struct sock_xprt, xprt); 1579 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1580 switch (sk->sk_state) { 1581 case TCP_ESTABLISHED: 1582 spin_lock(&xprt->transport_lock); 1583 if (!xprt_test_and_set_connected(xprt)) { 1584 1585 /* Reset TCP record info */ 1586 transport->tcp_offset = 0; 1587 transport->tcp_reclen = 0; 1588 transport->tcp_copied = 0; 1589 transport->tcp_flags = 1590 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1591 xprt->connect_cookie++; 1592 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1593 xprt_clear_connecting(xprt); 1594 1595 xprt_wake_pending_tasks(xprt, -EAGAIN); 1596 } 1597 spin_unlock(&xprt->transport_lock); 1598 break; 1599 case TCP_FIN_WAIT1: 1600 /* The client initiated a shutdown of the socket */ 1601 xprt->connect_cookie++; 1602 xprt->reestablish_timeout = 0; 1603 set_bit(XPRT_CLOSING, &xprt->state); 1604 smp_mb__before_atomic(); 1605 clear_bit(XPRT_CONNECTED, &xprt->state); 1606 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1607 smp_mb__after_atomic(); 1608 break; 1609 case TCP_CLOSE_WAIT: 1610 /* The server initiated a shutdown of the socket */ 1611 xprt->connect_cookie++; 1612 clear_bit(XPRT_CONNECTED, &xprt->state); 1613 xs_tcp_force_close(xprt); 1614 case TCP_CLOSING: 1615 /* 1616 * If the server closed down the connection, make sure that 1617 * we back off before reconnecting 1618 */ 1619 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1620 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1621 break; 1622 case TCP_LAST_ACK: 1623 set_bit(XPRT_CLOSING, &xprt->state); 1624 smp_mb__before_atomic(); 1625 clear_bit(XPRT_CONNECTED, &xprt->state); 1626 smp_mb__after_atomic(); 1627 break; 1628 case TCP_CLOSE: 1629 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1630 &transport->sock_state)) 1631 xprt_clear_connecting(xprt); 1632 if (sk->sk_err) 1633 xprt_wake_pending_tasks(xprt, -sk->sk_err); 1634 xs_sock_mark_closed(xprt); 1635 } 1636 out: 1637 read_unlock_bh(&sk->sk_callback_lock); 1638 } 1639 1640 static void xs_write_space(struct sock *sk) 1641 { 1642 struct socket_wq *wq; 1643 struct rpc_xprt *xprt; 1644 1645 if (!sk->sk_socket) 1646 return; 1647 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1648 1649 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1650 return; 1651 rcu_read_lock(); 1652 wq = rcu_dereference(sk->sk_wq); 1653 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) 1654 goto out; 1655 1656 xprt_write_space(xprt); 1657 out: 1658 rcu_read_unlock(); 1659 } 1660 1661 /** 1662 * xs_udp_write_space - callback invoked when socket buffer space 1663 * becomes available 1664 * @sk: socket whose state has changed 1665 * 1666 * Called when more output buffer space is available for this socket. 1667 * We try not to wake our writers until they can make "significant" 1668 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1669 * with a bunch of small requests. 1670 */ 1671 static void xs_udp_write_space(struct sock *sk) 1672 { 1673 read_lock_bh(&sk->sk_callback_lock); 1674 1675 /* from net/core/sock.c:sock_def_write_space */ 1676 if (sock_writeable(sk)) 1677 xs_write_space(sk); 1678 1679 read_unlock_bh(&sk->sk_callback_lock); 1680 } 1681 1682 /** 1683 * xs_tcp_write_space - callback invoked when socket buffer space 1684 * becomes available 1685 * @sk: socket whose state has changed 1686 * 1687 * Called when more output buffer space is available for this socket. 1688 * We try not to wake our writers until they can make "significant" 1689 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1690 * with a bunch of small requests. 1691 */ 1692 static void xs_tcp_write_space(struct sock *sk) 1693 { 1694 read_lock_bh(&sk->sk_callback_lock); 1695 1696 /* from net/core/stream.c:sk_stream_write_space */ 1697 if (sk_stream_is_writeable(sk)) 1698 xs_write_space(sk); 1699 1700 read_unlock_bh(&sk->sk_callback_lock); 1701 } 1702 1703 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1704 { 1705 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1706 struct sock *sk = transport->inet; 1707 1708 if (transport->rcvsize) { 1709 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1710 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1711 } 1712 if (transport->sndsize) { 1713 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1714 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1715 sk->sk_write_space(sk); 1716 } 1717 } 1718 1719 /** 1720 * xs_udp_set_buffer_size - set send and receive limits 1721 * @xprt: generic transport 1722 * @sndsize: requested size of send buffer, in bytes 1723 * @rcvsize: requested size of receive buffer, in bytes 1724 * 1725 * Set socket send and receive buffer size limits. 1726 */ 1727 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1728 { 1729 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1730 1731 transport->sndsize = 0; 1732 if (sndsize) 1733 transport->sndsize = sndsize + 1024; 1734 transport->rcvsize = 0; 1735 if (rcvsize) 1736 transport->rcvsize = rcvsize + 1024; 1737 1738 xs_udp_do_set_buffer_size(xprt); 1739 } 1740 1741 /** 1742 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1743 * @task: task that timed out 1744 * 1745 * Adjust the congestion window after a retransmit timeout has occurred. 1746 */ 1747 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1748 { 1749 spin_lock_bh(&xprt->transport_lock); 1750 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1751 spin_unlock_bh(&xprt->transport_lock); 1752 } 1753 1754 static unsigned short xs_get_random_port(void) 1755 { 1756 unsigned short range = xprt_max_resvport - xprt_min_resvport + 1; 1757 unsigned short rand = (unsigned short) prandom_u32() % range; 1758 return rand + xprt_min_resvport; 1759 } 1760 1761 /** 1762 * xs_set_reuseaddr_port - set the socket's port and address reuse options 1763 * @sock: socket 1764 * 1765 * Note that this function has to be called on all sockets that share the 1766 * same port, and it must be called before binding. 1767 */ 1768 static void xs_sock_set_reuseport(struct socket *sock) 1769 { 1770 int opt = 1; 1771 1772 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, 1773 (char *)&opt, sizeof(opt)); 1774 } 1775 1776 static unsigned short xs_sock_getport(struct socket *sock) 1777 { 1778 struct sockaddr_storage buf; 1779 int buflen; 1780 unsigned short port = 0; 1781 1782 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0) 1783 goto out; 1784 switch (buf.ss_family) { 1785 case AF_INET6: 1786 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1787 break; 1788 case AF_INET: 1789 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1790 } 1791 out: 1792 return port; 1793 } 1794 1795 /** 1796 * xs_set_port - reset the port number in the remote endpoint address 1797 * @xprt: generic transport 1798 * @port: new port number 1799 * 1800 */ 1801 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1802 { 1803 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1804 1805 rpc_set_port(xs_addr(xprt), port); 1806 xs_update_peer_port(xprt); 1807 } 1808 1809 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1810 { 1811 if (transport->srcport == 0) 1812 transport->srcport = xs_sock_getport(sock); 1813 } 1814 1815 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1816 { 1817 unsigned short port = transport->srcport; 1818 1819 if (port == 0 && transport->xprt.resvport) 1820 port = xs_get_random_port(); 1821 return port; 1822 } 1823 1824 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1825 { 1826 if (transport->srcport != 0) 1827 transport->srcport = 0; 1828 if (!transport->xprt.resvport) 1829 return 0; 1830 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1831 return xprt_max_resvport; 1832 return --port; 1833 } 1834 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1835 { 1836 struct sockaddr_storage myaddr; 1837 int err, nloop = 0; 1838 unsigned short port = xs_get_srcport(transport); 1839 unsigned short last; 1840 1841 /* 1842 * If we are asking for any ephemeral port (i.e. port == 0 && 1843 * transport->xprt.resvport == 0), don't bind. Let the local 1844 * port selection happen implicitly when the socket is used 1845 * (for example at connect time). 1846 * 1847 * This ensures that we can continue to establish TCP 1848 * connections even when all local ephemeral ports are already 1849 * a part of some TCP connection. This makes no difference 1850 * for UDP sockets, but also doens't harm them. 1851 * 1852 * If we're asking for any reserved port (i.e. port == 0 && 1853 * transport->xprt.resvport == 1) xs_get_srcport above will 1854 * ensure that port is non-zero and we will bind as needed. 1855 */ 1856 if (port == 0) 1857 return 0; 1858 1859 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1860 do { 1861 rpc_set_port((struct sockaddr *)&myaddr, port); 1862 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1863 transport->xprt.addrlen); 1864 if (err == 0) { 1865 transport->srcport = port; 1866 break; 1867 } 1868 last = port; 1869 port = xs_next_srcport(transport, port); 1870 if (port > last) 1871 nloop++; 1872 } while (err == -EADDRINUSE && nloop != 2); 1873 1874 if (myaddr.ss_family == AF_INET) 1875 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1876 &((struct sockaddr_in *)&myaddr)->sin_addr, 1877 port, err ? "failed" : "ok", err); 1878 else 1879 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1880 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1881 port, err ? "failed" : "ok", err); 1882 return err; 1883 } 1884 1885 /* 1886 * We don't support autobind on AF_LOCAL sockets 1887 */ 1888 static void xs_local_rpcbind(struct rpc_task *task) 1889 { 1890 xprt_set_bound(task->tk_xprt); 1891 } 1892 1893 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1894 { 1895 } 1896 1897 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1898 static struct lock_class_key xs_key[2]; 1899 static struct lock_class_key xs_slock_key[2]; 1900 1901 static inline void xs_reclassify_socketu(struct socket *sock) 1902 { 1903 struct sock *sk = sock->sk; 1904 1905 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1906 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1907 } 1908 1909 static inline void xs_reclassify_socket4(struct socket *sock) 1910 { 1911 struct sock *sk = sock->sk; 1912 1913 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1914 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1915 } 1916 1917 static inline void xs_reclassify_socket6(struct socket *sock) 1918 { 1919 struct sock *sk = sock->sk; 1920 1921 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1922 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1923 } 1924 1925 static inline void xs_reclassify_socket(int family, struct socket *sock) 1926 { 1927 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1928 return; 1929 1930 switch (family) { 1931 case AF_LOCAL: 1932 xs_reclassify_socketu(sock); 1933 break; 1934 case AF_INET: 1935 xs_reclassify_socket4(sock); 1936 break; 1937 case AF_INET6: 1938 xs_reclassify_socket6(sock); 1939 break; 1940 } 1941 } 1942 #else 1943 static inline void xs_reclassify_socket(int family, struct socket *sock) 1944 { 1945 } 1946 #endif 1947 1948 static void xs_dummy_setup_socket(struct work_struct *work) 1949 { 1950 } 1951 1952 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1953 struct sock_xprt *transport, int family, int type, 1954 int protocol, bool reuseport) 1955 { 1956 struct socket *sock; 1957 int err; 1958 1959 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1960 if (err < 0) { 1961 dprintk("RPC: can't create %d transport socket (%d).\n", 1962 protocol, -err); 1963 goto out; 1964 } 1965 xs_reclassify_socket(family, sock); 1966 1967 if (reuseport) 1968 xs_sock_set_reuseport(sock); 1969 1970 err = xs_bind(transport, sock); 1971 if (err) { 1972 sock_release(sock); 1973 goto out; 1974 } 1975 1976 return sock; 1977 out: 1978 return ERR_PTR(err); 1979 } 1980 1981 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1982 struct socket *sock) 1983 { 1984 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1985 xprt); 1986 1987 if (!transport->inet) { 1988 struct sock *sk = sock->sk; 1989 1990 write_lock_bh(&sk->sk_callback_lock); 1991 1992 xs_save_old_callbacks(transport, sk); 1993 1994 sk->sk_user_data = xprt; 1995 sk->sk_data_ready = xs_data_ready; 1996 sk->sk_write_space = xs_udp_write_space; 1997 sock_set_flag(sk, SOCK_FASYNC); 1998 sk->sk_error_report = xs_error_report; 1999 sk->sk_allocation = GFP_NOIO; 2000 2001 xprt_clear_connected(xprt); 2002 2003 /* Reset to new socket */ 2004 transport->sock = sock; 2005 transport->inet = sk; 2006 2007 write_unlock_bh(&sk->sk_callback_lock); 2008 } 2009 2010 /* Tell the socket layer to start connecting... */ 2011 xprt->stat.connect_count++; 2012 xprt->stat.connect_start = jiffies; 2013 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 2014 } 2015 2016 /** 2017 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 2018 * @transport: socket transport to connect 2019 */ 2020 static int xs_local_setup_socket(struct sock_xprt *transport) 2021 { 2022 struct rpc_xprt *xprt = &transport->xprt; 2023 struct socket *sock; 2024 int status = -EIO; 2025 2026 status = __sock_create(xprt->xprt_net, AF_LOCAL, 2027 SOCK_STREAM, 0, &sock, 1); 2028 if (status < 0) { 2029 dprintk("RPC: can't create AF_LOCAL " 2030 "transport socket (%d).\n", -status); 2031 goto out; 2032 } 2033 xs_reclassify_socket(AF_LOCAL, sock); 2034 2035 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 2036 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2037 2038 status = xs_local_finish_connecting(xprt, sock); 2039 trace_rpc_socket_connect(xprt, sock, status); 2040 switch (status) { 2041 case 0: 2042 dprintk("RPC: xprt %p connected to %s\n", 2043 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2044 xprt_set_connected(xprt); 2045 case -ENOBUFS: 2046 break; 2047 case -ENOENT: 2048 dprintk("RPC: xprt %p: socket %s does not exist\n", 2049 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2050 break; 2051 case -ECONNREFUSED: 2052 dprintk("RPC: xprt %p: connection refused for %s\n", 2053 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2054 break; 2055 default: 2056 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 2057 __func__, -status, 2058 xprt->address_strings[RPC_DISPLAY_ADDR]); 2059 } 2060 2061 out: 2062 xprt_clear_connecting(xprt); 2063 xprt_wake_pending_tasks(xprt, status); 2064 return status; 2065 } 2066 2067 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2068 { 2069 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2070 int ret; 2071 2072 if (RPC_IS_ASYNC(task)) { 2073 /* 2074 * We want the AF_LOCAL connect to be resolved in the 2075 * filesystem namespace of the process making the rpc 2076 * call. Thus we connect synchronously. 2077 * 2078 * If we want to support asynchronous AF_LOCAL calls, 2079 * we'll need to figure out how to pass a namespace to 2080 * connect. 2081 */ 2082 rpc_exit(task, -ENOTCONN); 2083 return; 2084 } 2085 ret = xs_local_setup_socket(transport); 2086 if (ret && !RPC_IS_SOFTCONN(task)) 2087 msleep_interruptible(15000); 2088 } 2089 2090 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 2091 /* 2092 * Note that this should be called with XPRT_LOCKED held (or when we otherwise 2093 * know that we have exclusive access to the socket), to guard against 2094 * races with xs_reset_transport. 2095 */ 2096 static void xs_set_memalloc(struct rpc_xprt *xprt) 2097 { 2098 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2099 xprt); 2100 2101 /* 2102 * If there's no sock, then we have nothing to set. The 2103 * reconnecting process will get it for us. 2104 */ 2105 if (!transport->inet) 2106 return; 2107 if (atomic_read(&xprt->swapper)) 2108 sk_set_memalloc(transport->inet); 2109 } 2110 2111 /** 2112 * xs_enable_swap - Tag this transport as being used for swap. 2113 * @xprt: transport to tag 2114 * 2115 * Take a reference to this transport on behalf of the rpc_clnt, and 2116 * optionally mark it for swapping if it wasn't already. 2117 */ 2118 static int 2119 xs_enable_swap(struct rpc_xprt *xprt) 2120 { 2121 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2122 2123 if (atomic_inc_return(&xprt->swapper) != 1) 2124 return 0; 2125 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2126 return -ERESTARTSYS; 2127 if (xs->inet) 2128 sk_set_memalloc(xs->inet); 2129 xprt_release_xprt(xprt, NULL); 2130 return 0; 2131 } 2132 2133 /** 2134 * xs_disable_swap - Untag this transport as being used for swap. 2135 * @xprt: transport to tag 2136 * 2137 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2138 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2139 */ 2140 static void 2141 xs_disable_swap(struct rpc_xprt *xprt) 2142 { 2143 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2144 2145 if (!atomic_dec_and_test(&xprt->swapper)) 2146 return; 2147 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2148 return; 2149 if (xs->inet) 2150 sk_clear_memalloc(xs->inet); 2151 xprt_release_xprt(xprt, NULL); 2152 } 2153 #else 2154 static void xs_set_memalloc(struct rpc_xprt *xprt) 2155 { 2156 } 2157 2158 static int 2159 xs_enable_swap(struct rpc_xprt *xprt) 2160 { 2161 return -EINVAL; 2162 } 2163 2164 static void 2165 xs_disable_swap(struct rpc_xprt *xprt) 2166 { 2167 } 2168 #endif 2169 2170 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2171 { 2172 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2173 2174 if (!transport->inet) { 2175 struct sock *sk = sock->sk; 2176 2177 write_lock_bh(&sk->sk_callback_lock); 2178 2179 xs_save_old_callbacks(transport, sk); 2180 2181 sk->sk_user_data = xprt; 2182 sk->sk_data_ready = xs_data_ready; 2183 sk->sk_write_space = xs_udp_write_space; 2184 sock_set_flag(sk, SOCK_FASYNC); 2185 sk->sk_allocation = GFP_NOIO; 2186 2187 xprt_set_connected(xprt); 2188 2189 /* Reset to new socket */ 2190 transport->sock = sock; 2191 transport->inet = sk; 2192 2193 xs_set_memalloc(xprt); 2194 2195 write_unlock_bh(&sk->sk_callback_lock); 2196 } 2197 xs_udp_do_set_buffer_size(xprt); 2198 2199 xprt->stat.connect_start = jiffies; 2200 } 2201 2202 static void xs_udp_setup_socket(struct work_struct *work) 2203 { 2204 struct sock_xprt *transport = 2205 container_of(work, struct sock_xprt, connect_worker.work); 2206 struct rpc_xprt *xprt = &transport->xprt; 2207 struct socket *sock; 2208 int status = -EIO; 2209 2210 sock = xs_create_sock(xprt, transport, 2211 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2212 IPPROTO_UDP, false); 2213 if (IS_ERR(sock)) 2214 goto out; 2215 2216 dprintk("RPC: worker connecting xprt %p via %s to " 2217 "%s (port %s)\n", xprt, 2218 xprt->address_strings[RPC_DISPLAY_PROTO], 2219 xprt->address_strings[RPC_DISPLAY_ADDR], 2220 xprt->address_strings[RPC_DISPLAY_PORT]); 2221 2222 xs_udp_finish_connecting(xprt, sock); 2223 trace_rpc_socket_connect(xprt, sock, 0); 2224 status = 0; 2225 out: 2226 xprt_unlock_connect(xprt, transport); 2227 xprt_clear_connecting(xprt); 2228 xprt_wake_pending_tasks(xprt, status); 2229 } 2230 2231 /** 2232 * xs_tcp_shutdown - gracefully shut down a TCP socket 2233 * @xprt: transport 2234 * 2235 * Initiates a graceful shutdown of the TCP socket by calling the 2236 * equivalent of shutdown(SHUT_RDWR); 2237 */ 2238 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2239 { 2240 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2241 struct socket *sock = transport->sock; 2242 2243 if (sock == NULL) 2244 return; 2245 if (xprt_connected(xprt)) { 2246 kernel_sock_shutdown(sock, SHUT_RDWR); 2247 trace_rpc_socket_shutdown(xprt, sock); 2248 } else 2249 xs_reset_transport(transport); 2250 } 2251 2252 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 2253 struct socket *sock) 2254 { 2255 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2256 unsigned int keepidle; 2257 unsigned int keepcnt; 2258 unsigned int opt_on = 1; 2259 unsigned int timeo; 2260 2261 spin_lock_bh(&xprt->transport_lock); 2262 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); 2263 keepcnt = xprt->timeout->to_retries + 1; 2264 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2265 (xprt->timeout->to_retries + 1); 2266 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2267 spin_unlock_bh(&xprt->transport_lock); 2268 2269 /* TCP Keepalive options */ 2270 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2271 (char *)&opt_on, sizeof(opt_on)); 2272 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2273 (char *)&keepidle, sizeof(keepidle)); 2274 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2275 (char *)&keepidle, sizeof(keepidle)); 2276 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2277 (char *)&keepcnt, sizeof(keepcnt)); 2278 2279 /* TCP user timeout (see RFC5482) */ 2280 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, 2281 (char *)&timeo, sizeof(timeo)); 2282 } 2283 2284 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, 2285 unsigned long connect_timeout, 2286 unsigned long reconnect_timeout) 2287 { 2288 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2289 struct rpc_timeout to; 2290 unsigned long initval; 2291 2292 spin_lock_bh(&xprt->transport_lock); 2293 if (reconnect_timeout < xprt->max_reconnect_timeout) 2294 xprt->max_reconnect_timeout = reconnect_timeout; 2295 if (connect_timeout < xprt->connect_timeout) { 2296 memcpy(&to, xprt->timeout, sizeof(to)); 2297 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); 2298 /* Arbitrary lower limit */ 2299 if (initval < XS_TCP_INIT_REEST_TO << 1) 2300 initval = XS_TCP_INIT_REEST_TO << 1; 2301 to.to_initval = initval; 2302 to.to_maxval = initval; 2303 memcpy(&transport->tcp_timeout, &to, 2304 sizeof(transport->tcp_timeout)); 2305 xprt->timeout = &transport->tcp_timeout; 2306 xprt->connect_timeout = connect_timeout; 2307 } 2308 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2309 spin_unlock_bh(&xprt->transport_lock); 2310 } 2311 2312 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2313 { 2314 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2315 int ret = -ENOTCONN; 2316 2317 if (!transport->inet) { 2318 struct sock *sk = sock->sk; 2319 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC; 2320 2321 /* Avoid temporary address, they are bad for long-lived 2322 * connections such as NFS mounts. 2323 * RFC4941, section 3.6 suggests that: 2324 * Individual applications, which have specific 2325 * knowledge about the normal duration of connections, 2326 * MAY override this as appropriate. 2327 */ 2328 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES, 2329 (char *)&addr_pref, sizeof(addr_pref)); 2330 2331 xs_tcp_set_socket_timeouts(xprt, sock); 2332 2333 write_lock_bh(&sk->sk_callback_lock); 2334 2335 xs_save_old_callbacks(transport, sk); 2336 2337 sk->sk_user_data = xprt; 2338 sk->sk_data_ready = xs_data_ready; 2339 sk->sk_state_change = xs_tcp_state_change; 2340 sk->sk_write_space = xs_tcp_write_space; 2341 sock_set_flag(sk, SOCK_FASYNC); 2342 sk->sk_error_report = xs_error_report; 2343 sk->sk_allocation = GFP_NOIO; 2344 2345 /* socket options */ 2346 sock_reset_flag(sk, SOCK_LINGER); 2347 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2348 2349 xprt_clear_connected(xprt); 2350 2351 /* Reset to new socket */ 2352 transport->sock = sock; 2353 transport->inet = sk; 2354 2355 write_unlock_bh(&sk->sk_callback_lock); 2356 } 2357 2358 if (!xprt_bound(xprt)) 2359 goto out; 2360 2361 xs_set_memalloc(xprt); 2362 2363 /* Tell the socket layer to start connecting... */ 2364 xprt->stat.connect_count++; 2365 xprt->stat.connect_start = jiffies; 2366 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2367 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2368 switch (ret) { 2369 case 0: 2370 xs_set_srcport(transport, sock); 2371 case -EINPROGRESS: 2372 /* SYN_SENT! */ 2373 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2374 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2375 break; 2376 case -EADDRNOTAVAIL: 2377 /* Source port number is unavailable. Try a new one! */ 2378 transport->srcport = 0; 2379 } 2380 out: 2381 return ret; 2382 } 2383 2384 /** 2385 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2386 * 2387 * Invoked by a work queue tasklet. 2388 */ 2389 static void xs_tcp_setup_socket(struct work_struct *work) 2390 { 2391 struct sock_xprt *transport = 2392 container_of(work, struct sock_xprt, connect_worker.work); 2393 struct socket *sock = transport->sock; 2394 struct rpc_xprt *xprt = &transport->xprt; 2395 int status = -EIO; 2396 2397 if (!sock) { 2398 sock = xs_create_sock(xprt, transport, 2399 xs_addr(xprt)->sa_family, SOCK_STREAM, 2400 IPPROTO_TCP, true); 2401 if (IS_ERR(sock)) { 2402 status = PTR_ERR(sock); 2403 goto out; 2404 } 2405 } 2406 2407 dprintk("RPC: worker connecting xprt %p via %s to " 2408 "%s (port %s)\n", xprt, 2409 xprt->address_strings[RPC_DISPLAY_PROTO], 2410 xprt->address_strings[RPC_DISPLAY_ADDR], 2411 xprt->address_strings[RPC_DISPLAY_PORT]); 2412 2413 status = xs_tcp_finish_connecting(xprt, sock); 2414 trace_rpc_socket_connect(xprt, sock, status); 2415 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2416 xprt, -status, xprt_connected(xprt), 2417 sock->sk->sk_state); 2418 switch (status) { 2419 default: 2420 printk("%s: connect returned unhandled error %d\n", 2421 __func__, status); 2422 case -EADDRNOTAVAIL: 2423 /* We're probably in TIME_WAIT. Get rid of existing socket, 2424 * and retry 2425 */ 2426 xs_tcp_force_close(xprt); 2427 break; 2428 case 0: 2429 case -EINPROGRESS: 2430 case -EALREADY: 2431 xprt_unlock_connect(xprt, transport); 2432 return; 2433 case -EINVAL: 2434 /* Happens, for instance, if the user specified a link 2435 * local IPv6 address without a scope-id. 2436 */ 2437 case -ECONNREFUSED: 2438 case -ECONNRESET: 2439 case -ENETUNREACH: 2440 case -EADDRINUSE: 2441 case -ENOBUFS: 2442 /* 2443 * xs_tcp_force_close() wakes tasks with -EIO. 2444 * We need to wake them first to ensure the 2445 * correct error code. 2446 */ 2447 xprt_wake_pending_tasks(xprt, status); 2448 xs_tcp_force_close(xprt); 2449 goto out; 2450 } 2451 status = -EAGAIN; 2452 out: 2453 xprt_unlock_connect(xprt, transport); 2454 xprt_clear_connecting(xprt); 2455 xprt_wake_pending_tasks(xprt, status); 2456 } 2457 2458 static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt) 2459 { 2460 unsigned long start, now = jiffies; 2461 2462 start = xprt->stat.connect_start + xprt->reestablish_timeout; 2463 if (time_after(start, now)) 2464 return start - now; 2465 return 0; 2466 } 2467 2468 static void xs_reconnect_backoff(struct rpc_xprt *xprt) 2469 { 2470 xprt->reestablish_timeout <<= 1; 2471 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout) 2472 xprt->reestablish_timeout = xprt->max_reconnect_timeout; 2473 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2474 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2475 } 2476 2477 /** 2478 * xs_connect - connect a socket to a remote endpoint 2479 * @xprt: pointer to transport structure 2480 * @task: address of RPC task that manages state of connect request 2481 * 2482 * TCP: If the remote end dropped the connection, delay reconnecting. 2483 * 2484 * UDP socket connects are synchronous, but we use a work queue anyway 2485 * to guarantee that even unprivileged user processes can set up a 2486 * socket on a privileged port. 2487 * 2488 * If a UDP socket connect fails, the delay behavior here prevents 2489 * retry floods (hard mounts). 2490 */ 2491 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2492 { 2493 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2494 unsigned long delay = 0; 2495 2496 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2497 2498 if (transport->sock != NULL) { 2499 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2500 "seconds\n", 2501 xprt, xprt->reestablish_timeout / HZ); 2502 2503 /* Start by resetting any existing state */ 2504 xs_reset_transport(transport); 2505 2506 delay = xs_reconnect_delay(xprt); 2507 xs_reconnect_backoff(xprt); 2508 2509 } else 2510 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2511 2512 queue_delayed_work(xprtiod_workqueue, 2513 &transport->connect_worker, 2514 delay); 2515 } 2516 2517 /** 2518 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2519 * @xprt: rpc_xprt struct containing statistics 2520 * @seq: output file 2521 * 2522 */ 2523 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2524 { 2525 long idle_time = 0; 2526 2527 if (xprt_connected(xprt)) 2528 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2529 2530 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2531 "%llu %llu %lu %llu %llu\n", 2532 xprt->stat.bind_count, 2533 xprt->stat.connect_count, 2534 xprt->stat.connect_time, 2535 idle_time, 2536 xprt->stat.sends, 2537 xprt->stat.recvs, 2538 xprt->stat.bad_xids, 2539 xprt->stat.req_u, 2540 xprt->stat.bklog_u, 2541 xprt->stat.max_slots, 2542 xprt->stat.sending_u, 2543 xprt->stat.pending_u); 2544 } 2545 2546 /** 2547 * xs_udp_print_stats - display UDP socket-specifc stats 2548 * @xprt: rpc_xprt struct containing statistics 2549 * @seq: output file 2550 * 2551 */ 2552 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2553 { 2554 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2555 2556 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2557 "%lu %llu %llu\n", 2558 transport->srcport, 2559 xprt->stat.bind_count, 2560 xprt->stat.sends, 2561 xprt->stat.recvs, 2562 xprt->stat.bad_xids, 2563 xprt->stat.req_u, 2564 xprt->stat.bklog_u, 2565 xprt->stat.max_slots, 2566 xprt->stat.sending_u, 2567 xprt->stat.pending_u); 2568 } 2569 2570 /** 2571 * xs_tcp_print_stats - display TCP socket-specifc stats 2572 * @xprt: rpc_xprt struct containing statistics 2573 * @seq: output file 2574 * 2575 */ 2576 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2577 { 2578 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2579 long idle_time = 0; 2580 2581 if (xprt_connected(xprt)) 2582 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2583 2584 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2585 "%llu %llu %lu %llu %llu\n", 2586 transport->srcport, 2587 xprt->stat.bind_count, 2588 xprt->stat.connect_count, 2589 xprt->stat.connect_time, 2590 idle_time, 2591 xprt->stat.sends, 2592 xprt->stat.recvs, 2593 xprt->stat.bad_xids, 2594 xprt->stat.req_u, 2595 xprt->stat.bklog_u, 2596 xprt->stat.max_slots, 2597 xprt->stat.sending_u, 2598 xprt->stat.pending_u); 2599 } 2600 2601 /* 2602 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2603 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2604 * to use the server side send routines. 2605 */ 2606 static int bc_malloc(struct rpc_task *task) 2607 { 2608 struct rpc_rqst *rqst = task->tk_rqstp; 2609 size_t size = rqst->rq_callsize; 2610 struct page *page; 2611 struct rpc_buffer *buf; 2612 2613 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { 2614 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", 2615 size); 2616 return -EINVAL; 2617 } 2618 2619 page = alloc_page(GFP_KERNEL); 2620 if (!page) 2621 return -ENOMEM; 2622 2623 buf = page_address(page); 2624 buf->len = PAGE_SIZE; 2625 2626 rqst->rq_buffer = buf->data; 2627 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; 2628 return 0; 2629 } 2630 2631 /* 2632 * Free the space allocated in the bc_alloc routine 2633 */ 2634 static void bc_free(struct rpc_task *task) 2635 { 2636 void *buffer = task->tk_rqstp->rq_buffer; 2637 struct rpc_buffer *buf; 2638 2639 buf = container_of(buffer, struct rpc_buffer, data); 2640 free_page((unsigned long)buf); 2641 } 2642 2643 /* 2644 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2645 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2646 */ 2647 static int bc_sendto(struct rpc_rqst *req) 2648 { 2649 int len; 2650 struct xdr_buf *xbufp = &req->rq_snd_buf; 2651 struct rpc_xprt *xprt = req->rq_xprt; 2652 struct sock_xprt *transport = 2653 container_of(xprt, struct sock_xprt, xprt); 2654 struct socket *sock = transport->sock; 2655 unsigned long headoff; 2656 unsigned long tailoff; 2657 2658 xs_encode_stream_record_marker(xbufp); 2659 2660 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2661 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2662 len = svc_send_common(sock, xbufp, 2663 virt_to_page(xbufp->head[0].iov_base), headoff, 2664 xbufp->tail[0].iov_base, tailoff); 2665 2666 if (len != xbufp->len) { 2667 printk(KERN_NOTICE "Error sending entire callback!\n"); 2668 len = -EAGAIN; 2669 } 2670 2671 return len; 2672 } 2673 2674 /* 2675 * The send routine. Borrows from svc_send 2676 */ 2677 static int bc_send_request(struct rpc_task *task) 2678 { 2679 struct rpc_rqst *req = task->tk_rqstp; 2680 struct svc_xprt *xprt; 2681 int len; 2682 2683 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2684 /* 2685 * Get the server socket associated with this callback xprt 2686 */ 2687 xprt = req->rq_xprt->bc_xprt; 2688 2689 /* 2690 * Grab the mutex to serialize data as the connection is shared 2691 * with the fore channel 2692 */ 2693 if (!mutex_trylock(&xprt->xpt_mutex)) { 2694 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2695 if (!mutex_trylock(&xprt->xpt_mutex)) 2696 return -EAGAIN; 2697 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2698 } 2699 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2700 len = -ENOTCONN; 2701 else 2702 len = bc_sendto(req); 2703 mutex_unlock(&xprt->xpt_mutex); 2704 2705 if (len > 0) 2706 len = 0; 2707 2708 return len; 2709 } 2710 2711 /* 2712 * The close routine. Since this is client initiated, we do nothing 2713 */ 2714 2715 static void bc_close(struct rpc_xprt *xprt) 2716 { 2717 } 2718 2719 /* 2720 * The xprt destroy routine. Again, because this connection is client 2721 * initiated, we do nothing 2722 */ 2723 2724 static void bc_destroy(struct rpc_xprt *xprt) 2725 { 2726 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2727 2728 xs_xprt_free(xprt); 2729 module_put(THIS_MODULE); 2730 } 2731 2732 static const struct rpc_xprt_ops xs_local_ops = { 2733 .reserve_xprt = xprt_reserve_xprt, 2734 .release_xprt = xs_tcp_release_xprt, 2735 .alloc_slot = xprt_alloc_slot, 2736 .rpcbind = xs_local_rpcbind, 2737 .set_port = xs_local_set_port, 2738 .connect = xs_local_connect, 2739 .buf_alloc = rpc_malloc, 2740 .buf_free = rpc_free, 2741 .send_request = xs_local_send_request, 2742 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2743 .close = xs_close, 2744 .destroy = xs_destroy, 2745 .print_stats = xs_local_print_stats, 2746 .enable_swap = xs_enable_swap, 2747 .disable_swap = xs_disable_swap, 2748 }; 2749 2750 static const struct rpc_xprt_ops xs_udp_ops = { 2751 .set_buffer_size = xs_udp_set_buffer_size, 2752 .reserve_xprt = xprt_reserve_xprt_cong, 2753 .release_xprt = xprt_release_xprt_cong, 2754 .alloc_slot = xprt_alloc_slot, 2755 .rpcbind = rpcb_getport_async, 2756 .set_port = xs_set_port, 2757 .connect = xs_connect, 2758 .buf_alloc = rpc_malloc, 2759 .buf_free = rpc_free, 2760 .send_request = xs_udp_send_request, 2761 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2762 .timer = xs_udp_timer, 2763 .release_request = xprt_release_rqst_cong, 2764 .close = xs_close, 2765 .destroy = xs_destroy, 2766 .print_stats = xs_udp_print_stats, 2767 .enable_swap = xs_enable_swap, 2768 .disable_swap = xs_disable_swap, 2769 .inject_disconnect = xs_inject_disconnect, 2770 }; 2771 2772 static const struct rpc_xprt_ops xs_tcp_ops = { 2773 .reserve_xprt = xprt_reserve_xprt, 2774 .release_xprt = xs_tcp_release_xprt, 2775 .alloc_slot = xprt_lock_and_alloc_slot, 2776 .rpcbind = rpcb_getport_async, 2777 .set_port = xs_set_port, 2778 .connect = xs_connect, 2779 .buf_alloc = rpc_malloc, 2780 .buf_free = rpc_free, 2781 .send_request = xs_tcp_send_request, 2782 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2783 .close = xs_tcp_shutdown, 2784 .destroy = xs_destroy, 2785 .set_connect_timeout = xs_tcp_set_connect_timeout, 2786 .print_stats = xs_tcp_print_stats, 2787 .enable_swap = xs_enable_swap, 2788 .disable_swap = xs_disable_swap, 2789 .inject_disconnect = xs_inject_disconnect, 2790 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2791 .bc_setup = xprt_setup_bc, 2792 .bc_up = xs_tcp_bc_up, 2793 .bc_maxpayload = xs_tcp_bc_maxpayload, 2794 .bc_free_rqst = xprt_free_bc_rqst, 2795 .bc_destroy = xprt_destroy_bc, 2796 #endif 2797 }; 2798 2799 /* 2800 * The rpc_xprt_ops for the server backchannel 2801 */ 2802 2803 static const struct rpc_xprt_ops bc_tcp_ops = { 2804 .reserve_xprt = xprt_reserve_xprt, 2805 .release_xprt = xprt_release_xprt, 2806 .alloc_slot = xprt_alloc_slot, 2807 .buf_alloc = bc_malloc, 2808 .buf_free = bc_free, 2809 .send_request = bc_send_request, 2810 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2811 .close = bc_close, 2812 .destroy = bc_destroy, 2813 .print_stats = xs_tcp_print_stats, 2814 .enable_swap = xs_enable_swap, 2815 .disable_swap = xs_disable_swap, 2816 .inject_disconnect = xs_inject_disconnect, 2817 }; 2818 2819 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2820 { 2821 static const struct sockaddr_in sin = { 2822 .sin_family = AF_INET, 2823 .sin_addr.s_addr = htonl(INADDR_ANY), 2824 }; 2825 static const struct sockaddr_in6 sin6 = { 2826 .sin6_family = AF_INET6, 2827 .sin6_addr = IN6ADDR_ANY_INIT, 2828 }; 2829 2830 switch (family) { 2831 case AF_LOCAL: 2832 break; 2833 case AF_INET: 2834 memcpy(sap, &sin, sizeof(sin)); 2835 break; 2836 case AF_INET6: 2837 memcpy(sap, &sin6, sizeof(sin6)); 2838 break; 2839 default: 2840 dprintk("RPC: %s: Bad address family\n", __func__); 2841 return -EAFNOSUPPORT; 2842 } 2843 return 0; 2844 } 2845 2846 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2847 unsigned int slot_table_size, 2848 unsigned int max_slot_table_size) 2849 { 2850 struct rpc_xprt *xprt; 2851 struct sock_xprt *new; 2852 2853 if (args->addrlen > sizeof(xprt->addr)) { 2854 dprintk("RPC: xs_setup_xprt: address too large\n"); 2855 return ERR_PTR(-EBADF); 2856 } 2857 2858 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2859 max_slot_table_size); 2860 if (xprt == NULL) { 2861 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2862 "rpc_xprt\n"); 2863 return ERR_PTR(-ENOMEM); 2864 } 2865 2866 new = container_of(xprt, struct sock_xprt, xprt); 2867 mutex_init(&new->recv_mutex); 2868 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2869 xprt->addrlen = args->addrlen; 2870 if (args->srcaddr) 2871 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2872 else { 2873 int err; 2874 err = xs_init_anyaddr(args->dstaddr->sa_family, 2875 (struct sockaddr *)&new->srcaddr); 2876 if (err != 0) { 2877 xprt_free(xprt); 2878 return ERR_PTR(err); 2879 } 2880 } 2881 2882 return xprt; 2883 } 2884 2885 static const struct rpc_timeout xs_local_default_timeout = { 2886 .to_initval = 10 * HZ, 2887 .to_maxval = 10 * HZ, 2888 .to_retries = 2, 2889 }; 2890 2891 /** 2892 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2893 * @args: rpc transport creation arguments 2894 * 2895 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2896 */ 2897 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2898 { 2899 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2900 struct sock_xprt *transport; 2901 struct rpc_xprt *xprt; 2902 struct rpc_xprt *ret; 2903 2904 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2905 xprt_max_tcp_slot_table_entries); 2906 if (IS_ERR(xprt)) 2907 return xprt; 2908 transport = container_of(xprt, struct sock_xprt, xprt); 2909 2910 xprt->prot = 0; 2911 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2912 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2913 2914 xprt->bind_timeout = XS_BIND_TO; 2915 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2916 xprt->idle_timeout = XS_IDLE_DISC_TO; 2917 2918 xprt->ops = &xs_local_ops; 2919 xprt->timeout = &xs_local_default_timeout; 2920 2921 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn); 2922 INIT_DELAYED_WORK(&transport->connect_worker, 2923 xs_dummy_setup_socket); 2924 2925 switch (sun->sun_family) { 2926 case AF_LOCAL: 2927 if (sun->sun_path[0] != '/') { 2928 dprintk("RPC: bad AF_LOCAL address: %s\n", 2929 sun->sun_path); 2930 ret = ERR_PTR(-EINVAL); 2931 goto out_err; 2932 } 2933 xprt_set_bound(xprt); 2934 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2935 ret = ERR_PTR(xs_local_setup_socket(transport)); 2936 if (ret) 2937 goto out_err; 2938 break; 2939 default: 2940 ret = ERR_PTR(-EAFNOSUPPORT); 2941 goto out_err; 2942 } 2943 2944 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2945 xprt->address_strings[RPC_DISPLAY_ADDR]); 2946 2947 if (try_module_get(THIS_MODULE)) 2948 return xprt; 2949 ret = ERR_PTR(-EINVAL); 2950 out_err: 2951 xs_xprt_free(xprt); 2952 return ret; 2953 } 2954 2955 static const struct rpc_timeout xs_udp_default_timeout = { 2956 .to_initval = 5 * HZ, 2957 .to_maxval = 30 * HZ, 2958 .to_increment = 5 * HZ, 2959 .to_retries = 5, 2960 }; 2961 2962 /** 2963 * xs_setup_udp - Set up transport to use a UDP socket 2964 * @args: rpc transport creation arguments 2965 * 2966 */ 2967 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2968 { 2969 struct sockaddr *addr = args->dstaddr; 2970 struct rpc_xprt *xprt; 2971 struct sock_xprt *transport; 2972 struct rpc_xprt *ret; 2973 2974 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2975 xprt_udp_slot_table_entries); 2976 if (IS_ERR(xprt)) 2977 return xprt; 2978 transport = container_of(xprt, struct sock_xprt, xprt); 2979 2980 xprt->prot = IPPROTO_UDP; 2981 xprt->tsh_size = 0; 2982 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2983 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2984 2985 xprt->bind_timeout = XS_BIND_TO; 2986 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2987 xprt->idle_timeout = XS_IDLE_DISC_TO; 2988 2989 xprt->ops = &xs_udp_ops; 2990 2991 xprt->timeout = &xs_udp_default_timeout; 2992 2993 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2994 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 2995 2996 switch (addr->sa_family) { 2997 case AF_INET: 2998 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2999 xprt_set_bound(xprt); 3000 3001 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 3002 break; 3003 case AF_INET6: 3004 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3005 xprt_set_bound(xprt); 3006 3007 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 3008 break; 3009 default: 3010 ret = ERR_PTR(-EAFNOSUPPORT); 3011 goto out_err; 3012 } 3013 3014 if (xprt_bound(xprt)) 3015 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3016 xprt->address_strings[RPC_DISPLAY_ADDR], 3017 xprt->address_strings[RPC_DISPLAY_PORT], 3018 xprt->address_strings[RPC_DISPLAY_PROTO]); 3019 else 3020 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3021 xprt->address_strings[RPC_DISPLAY_ADDR], 3022 xprt->address_strings[RPC_DISPLAY_PROTO]); 3023 3024 if (try_module_get(THIS_MODULE)) 3025 return xprt; 3026 ret = ERR_PTR(-EINVAL); 3027 out_err: 3028 xs_xprt_free(xprt); 3029 return ret; 3030 } 3031 3032 static const struct rpc_timeout xs_tcp_default_timeout = { 3033 .to_initval = 60 * HZ, 3034 .to_maxval = 60 * HZ, 3035 .to_retries = 2, 3036 }; 3037 3038 /** 3039 * xs_setup_tcp - Set up transport to use a TCP socket 3040 * @args: rpc transport creation arguments 3041 * 3042 */ 3043 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 3044 { 3045 struct sockaddr *addr = args->dstaddr; 3046 struct rpc_xprt *xprt; 3047 struct sock_xprt *transport; 3048 struct rpc_xprt *ret; 3049 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 3050 3051 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 3052 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 3053 3054 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3055 max_slot_table_size); 3056 if (IS_ERR(xprt)) 3057 return xprt; 3058 transport = container_of(xprt, struct sock_xprt, xprt); 3059 3060 xprt->prot = IPPROTO_TCP; 3061 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 3062 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3063 3064 xprt->bind_timeout = XS_BIND_TO; 3065 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 3066 xprt->idle_timeout = XS_IDLE_DISC_TO; 3067 3068 xprt->ops = &xs_tcp_ops; 3069 xprt->timeout = &xs_tcp_default_timeout; 3070 3071 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 3072 xprt->connect_timeout = xprt->timeout->to_initval * 3073 (xprt->timeout->to_retries + 1); 3074 3075 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn); 3076 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 3077 3078 switch (addr->sa_family) { 3079 case AF_INET: 3080 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3081 xprt_set_bound(xprt); 3082 3083 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 3084 break; 3085 case AF_INET6: 3086 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3087 xprt_set_bound(xprt); 3088 3089 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 3090 break; 3091 default: 3092 ret = ERR_PTR(-EAFNOSUPPORT); 3093 goto out_err; 3094 } 3095 3096 if (xprt_bound(xprt)) 3097 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3098 xprt->address_strings[RPC_DISPLAY_ADDR], 3099 xprt->address_strings[RPC_DISPLAY_PORT], 3100 xprt->address_strings[RPC_DISPLAY_PROTO]); 3101 else 3102 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3103 xprt->address_strings[RPC_DISPLAY_ADDR], 3104 xprt->address_strings[RPC_DISPLAY_PROTO]); 3105 3106 if (try_module_get(THIS_MODULE)) 3107 return xprt; 3108 ret = ERR_PTR(-EINVAL); 3109 out_err: 3110 xs_xprt_free(xprt); 3111 return ret; 3112 } 3113 3114 /** 3115 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 3116 * @args: rpc transport creation arguments 3117 * 3118 */ 3119 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 3120 { 3121 struct sockaddr *addr = args->dstaddr; 3122 struct rpc_xprt *xprt; 3123 struct sock_xprt *transport; 3124 struct svc_sock *bc_sock; 3125 struct rpc_xprt *ret; 3126 3127 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3128 xprt_tcp_slot_table_entries); 3129 if (IS_ERR(xprt)) 3130 return xprt; 3131 transport = container_of(xprt, struct sock_xprt, xprt); 3132 3133 xprt->prot = IPPROTO_TCP; 3134 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 3135 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3136 xprt->timeout = &xs_tcp_default_timeout; 3137 3138 /* backchannel */ 3139 xprt_set_bound(xprt); 3140 xprt->bind_timeout = 0; 3141 xprt->reestablish_timeout = 0; 3142 xprt->idle_timeout = 0; 3143 3144 xprt->ops = &bc_tcp_ops; 3145 3146 switch (addr->sa_family) { 3147 case AF_INET: 3148 xs_format_peer_addresses(xprt, "tcp", 3149 RPCBIND_NETID_TCP); 3150 break; 3151 case AF_INET6: 3152 xs_format_peer_addresses(xprt, "tcp", 3153 RPCBIND_NETID_TCP6); 3154 break; 3155 default: 3156 ret = ERR_PTR(-EAFNOSUPPORT); 3157 goto out_err; 3158 } 3159 3160 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3161 xprt->address_strings[RPC_DISPLAY_ADDR], 3162 xprt->address_strings[RPC_DISPLAY_PORT], 3163 xprt->address_strings[RPC_DISPLAY_PROTO]); 3164 3165 /* 3166 * Once we've associated a backchannel xprt with a connection, 3167 * we want to keep it around as long as the connection lasts, 3168 * in case we need to start using it for a backchannel again; 3169 * this reference won't be dropped until bc_xprt is destroyed. 3170 */ 3171 xprt_get(xprt); 3172 args->bc_xprt->xpt_bc_xprt = xprt; 3173 xprt->bc_xprt = args->bc_xprt; 3174 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3175 transport->sock = bc_sock->sk_sock; 3176 transport->inet = bc_sock->sk_sk; 3177 3178 /* 3179 * Since we don't want connections for the backchannel, we set 3180 * the xprt status to connected 3181 */ 3182 xprt_set_connected(xprt); 3183 3184 if (try_module_get(THIS_MODULE)) 3185 return xprt; 3186 3187 args->bc_xprt->xpt_bc_xprt = NULL; 3188 args->bc_xprt->xpt_bc_xps = NULL; 3189 xprt_put(xprt); 3190 ret = ERR_PTR(-EINVAL); 3191 out_err: 3192 xs_xprt_free(xprt); 3193 return ret; 3194 } 3195 3196 static struct xprt_class xs_local_transport = { 3197 .list = LIST_HEAD_INIT(xs_local_transport.list), 3198 .name = "named UNIX socket", 3199 .owner = THIS_MODULE, 3200 .ident = XPRT_TRANSPORT_LOCAL, 3201 .setup = xs_setup_local, 3202 }; 3203 3204 static struct xprt_class xs_udp_transport = { 3205 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3206 .name = "udp", 3207 .owner = THIS_MODULE, 3208 .ident = XPRT_TRANSPORT_UDP, 3209 .setup = xs_setup_udp, 3210 }; 3211 3212 static struct xprt_class xs_tcp_transport = { 3213 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3214 .name = "tcp", 3215 .owner = THIS_MODULE, 3216 .ident = XPRT_TRANSPORT_TCP, 3217 .setup = xs_setup_tcp, 3218 }; 3219 3220 static struct xprt_class xs_bc_tcp_transport = { 3221 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3222 .name = "tcp NFSv4.1 backchannel", 3223 .owner = THIS_MODULE, 3224 .ident = XPRT_TRANSPORT_BC_TCP, 3225 .setup = xs_setup_bc_tcp, 3226 }; 3227 3228 /** 3229 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3230 * 3231 */ 3232 int init_socket_xprt(void) 3233 { 3234 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3235 if (!sunrpc_table_header) 3236 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3237 #endif 3238 3239 xprt_register_transport(&xs_local_transport); 3240 xprt_register_transport(&xs_udp_transport); 3241 xprt_register_transport(&xs_tcp_transport); 3242 xprt_register_transport(&xs_bc_tcp_transport); 3243 3244 return 0; 3245 } 3246 3247 /** 3248 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3249 * 3250 */ 3251 void cleanup_socket_xprt(void) 3252 { 3253 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3254 if (sunrpc_table_header) { 3255 unregister_sysctl_table(sunrpc_table_header); 3256 sunrpc_table_header = NULL; 3257 } 3258 #endif 3259 3260 xprt_unregister_transport(&xs_local_transport); 3261 xprt_unregister_transport(&xs_udp_transport); 3262 xprt_unregister_transport(&xs_tcp_transport); 3263 xprt_unregister_transport(&xs_bc_tcp_transport); 3264 } 3265 3266 static int param_set_uint_minmax(const char *val, 3267 const struct kernel_param *kp, 3268 unsigned int min, unsigned int max) 3269 { 3270 unsigned int num; 3271 int ret; 3272 3273 if (!val) 3274 return -EINVAL; 3275 ret = kstrtouint(val, 0, &num); 3276 if (ret) 3277 return ret; 3278 if (num < min || num > max) 3279 return -EINVAL; 3280 *((unsigned int *)kp->arg) = num; 3281 return 0; 3282 } 3283 3284 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3285 { 3286 if (kp->arg == &xprt_min_resvport) 3287 return param_set_uint_minmax(val, kp, 3288 RPC_MIN_RESVPORT, 3289 xprt_max_resvport); 3290 return param_set_uint_minmax(val, kp, 3291 xprt_min_resvport, 3292 RPC_MAX_RESVPORT); 3293 } 3294 3295 static const struct kernel_param_ops param_ops_portnr = { 3296 .set = param_set_portnr, 3297 .get = param_get_uint, 3298 }; 3299 3300 #define param_check_portnr(name, p) \ 3301 __param_check(name, p, unsigned int); 3302 3303 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3304 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3305 3306 static int param_set_slot_table_size(const char *val, 3307 const struct kernel_param *kp) 3308 { 3309 return param_set_uint_minmax(val, kp, 3310 RPC_MIN_SLOT_TABLE, 3311 RPC_MAX_SLOT_TABLE); 3312 } 3313 3314 static const struct kernel_param_ops param_ops_slot_table_size = { 3315 .set = param_set_slot_table_size, 3316 .get = param_get_uint, 3317 }; 3318 3319 #define param_check_slot_table_size(name, p) \ 3320 __param_check(name, p, unsigned int); 3321 3322 static int param_set_max_slot_table_size(const char *val, 3323 const struct kernel_param *kp) 3324 { 3325 return param_set_uint_minmax(val, kp, 3326 RPC_MIN_SLOT_TABLE, 3327 RPC_MAX_SLOT_TABLE_LIMIT); 3328 } 3329 3330 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3331 .set = param_set_max_slot_table_size, 3332 .get = param_get_uint, 3333 }; 3334 3335 #define param_check_max_slot_table_size(name, p) \ 3336 __param_check(name, p, unsigned int); 3337 3338 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3339 slot_table_size, 0644); 3340 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3341 max_slot_table_size, 0644); 3342 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3343 slot_table_size, 0644); 3344 3345