1 /* 2 * linux/net/sunrpc/xprtsock.c 3 * 4 * Client-side transport implementation for sockets. 5 * 6 * TCP callback races fixes (C) 1998 Red Hat 7 * TCP send fixes (C) 1998 Red Hat 8 * TCP NFS related read + write fixes 9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 10 * 11 * Rewrite of larges part of the code in order to stabilize TCP stuff. 12 * Fix behaviour when socket buffer is full. 13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 14 * 15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 16 * 17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. 18 * <gilles.quillard@bull.net> 19 */ 20 21 #include <linux/types.h> 22 #include <linux/string.h> 23 #include <linux/slab.h> 24 #include <linux/module.h> 25 #include <linux/capability.h> 26 #include <linux/pagemap.h> 27 #include <linux/errno.h> 28 #include <linux/socket.h> 29 #include <linux/in.h> 30 #include <linux/net.h> 31 #include <linux/mm.h> 32 #include <linux/un.h> 33 #include <linux/udp.h> 34 #include <linux/tcp.h> 35 #include <linux/sunrpc/clnt.h> 36 #include <linux/sunrpc/addr.h> 37 #include <linux/sunrpc/sched.h> 38 #include <linux/sunrpc/svcsock.h> 39 #include <linux/sunrpc/xprtsock.h> 40 #include <linux/file.h> 41 #ifdef CONFIG_SUNRPC_BACKCHANNEL 42 #include <linux/sunrpc/bc_xprt.h> 43 #endif 44 45 #include <net/sock.h> 46 #include <net/checksum.h> 47 #include <net/udp.h> 48 #include <net/tcp.h> 49 50 #include <trace/events/sunrpc.h> 51 52 #include "sunrpc.h" 53 54 static void xs_close(struct rpc_xprt *xprt); 55 56 /* 57 * xprtsock tunables 58 */ 59 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 60 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 61 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 62 63 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 64 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 65 66 #define XS_TCP_LINGER_TO (15U * HZ) 67 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 68 69 /* 70 * We can register our own files under /proc/sys/sunrpc by 71 * calling register_sysctl_table() again. The files in that 72 * directory become the union of all files registered there. 73 * 74 * We simply need to make sure that we don't collide with 75 * someone else's file names! 76 */ 77 78 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 79 80 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 81 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 82 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 83 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 84 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 85 86 static struct ctl_table_header *sunrpc_table_header; 87 88 /* 89 * FIXME: changing the UDP slot table size should also resize the UDP 90 * socket buffers for existing UDP transports 91 */ 92 static struct ctl_table xs_tunables_table[] = { 93 { 94 .procname = "udp_slot_table_entries", 95 .data = &xprt_udp_slot_table_entries, 96 .maxlen = sizeof(unsigned int), 97 .mode = 0644, 98 .proc_handler = proc_dointvec_minmax, 99 .extra1 = &min_slot_table_size, 100 .extra2 = &max_slot_table_size 101 }, 102 { 103 .procname = "tcp_slot_table_entries", 104 .data = &xprt_tcp_slot_table_entries, 105 .maxlen = sizeof(unsigned int), 106 .mode = 0644, 107 .proc_handler = proc_dointvec_minmax, 108 .extra1 = &min_slot_table_size, 109 .extra2 = &max_slot_table_size 110 }, 111 { 112 .procname = "tcp_max_slot_table_entries", 113 .data = &xprt_max_tcp_slot_table_entries, 114 .maxlen = sizeof(unsigned int), 115 .mode = 0644, 116 .proc_handler = proc_dointvec_minmax, 117 .extra1 = &min_slot_table_size, 118 .extra2 = &max_tcp_slot_table_limit 119 }, 120 { 121 .procname = "min_resvport", 122 .data = &xprt_min_resvport, 123 .maxlen = sizeof(unsigned int), 124 .mode = 0644, 125 .proc_handler = proc_dointvec_minmax, 126 .extra1 = &xprt_min_resvport_limit, 127 .extra2 = &xprt_max_resvport_limit 128 }, 129 { 130 .procname = "max_resvport", 131 .data = &xprt_max_resvport, 132 .maxlen = sizeof(unsigned int), 133 .mode = 0644, 134 .proc_handler = proc_dointvec_minmax, 135 .extra1 = &xprt_min_resvport_limit, 136 .extra2 = &xprt_max_resvport_limit 137 }, 138 { 139 .procname = "tcp_fin_timeout", 140 .data = &xs_tcp_fin_timeout, 141 .maxlen = sizeof(xs_tcp_fin_timeout), 142 .mode = 0644, 143 .proc_handler = proc_dointvec_jiffies, 144 }, 145 { }, 146 }; 147 148 static struct ctl_table sunrpc_table[] = { 149 { 150 .procname = "sunrpc", 151 .mode = 0555, 152 .child = xs_tunables_table 153 }, 154 { }, 155 }; 156 157 #endif 158 159 /* 160 * Wait duration for a reply from the RPC portmapper. 161 */ 162 #define XS_BIND_TO (60U * HZ) 163 164 /* 165 * Delay if a UDP socket connect error occurs. This is most likely some 166 * kind of resource problem on the local host. 167 */ 168 #define XS_UDP_REEST_TO (2U * HZ) 169 170 /* 171 * The reestablish timeout allows clients to delay for a bit before attempting 172 * to reconnect to a server that just dropped our connection. 173 * 174 * We implement an exponential backoff when trying to reestablish a TCP 175 * transport connection with the server. Some servers like to drop a TCP 176 * connection when they are overworked, so we start with a short timeout and 177 * increase over time if the server is down or not responding. 178 */ 179 #define XS_TCP_INIT_REEST_TO (3U * HZ) 180 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 181 182 /* 183 * TCP idle timeout; client drops the transport socket if it is idle 184 * for this long. Note that we also timeout UDP sockets to prevent 185 * holding port numbers when there is no RPC traffic. 186 */ 187 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 188 189 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 190 # undef RPC_DEBUG_DATA 191 # define RPCDBG_FACILITY RPCDBG_TRANS 192 #endif 193 194 #ifdef RPC_DEBUG_DATA 195 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 196 { 197 u8 *buf = (u8 *) packet; 198 int j; 199 200 dprintk("RPC: %s\n", msg); 201 for (j = 0; j < count && j < 128; j += 4) { 202 if (!(j & 31)) { 203 if (j) 204 dprintk("\n"); 205 dprintk("0x%04x ", j); 206 } 207 dprintk("%02x%02x%02x%02x ", 208 buf[j], buf[j+1], buf[j+2], buf[j+3]); 209 } 210 dprintk("\n"); 211 } 212 #else 213 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 214 { 215 /* NOP */ 216 } 217 #endif 218 219 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 220 { 221 return (struct rpc_xprt *) sk->sk_user_data; 222 } 223 224 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 225 { 226 return (struct sockaddr *) &xprt->addr; 227 } 228 229 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 230 { 231 return (struct sockaddr_un *) &xprt->addr; 232 } 233 234 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 235 { 236 return (struct sockaddr_in *) &xprt->addr; 237 } 238 239 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 240 { 241 return (struct sockaddr_in6 *) &xprt->addr; 242 } 243 244 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 245 { 246 struct sockaddr *sap = xs_addr(xprt); 247 struct sockaddr_in6 *sin6; 248 struct sockaddr_in *sin; 249 struct sockaddr_un *sun; 250 char buf[128]; 251 252 switch (sap->sa_family) { 253 case AF_LOCAL: 254 sun = xs_addr_un(xprt); 255 strlcpy(buf, sun->sun_path, sizeof(buf)); 256 xprt->address_strings[RPC_DISPLAY_ADDR] = 257 kstrdup(buf, GFP_KERNEL); 258 break; 259 case AF_INET: 260 (void)rpc_ntop(sap, buf, sizeof(buf)); 261 xprt->address_strings[RPC_DISPLAY_ADDR] = 262 kstrdup(buf, GFP_KERNEL); 263 sin = xs_addr_in(xprt); 264 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 265 break; 266 case AF_INET6: 267 (void)rpc_ntop(sap, buf, sizeof(buf)); 268 xprt->address_strings[RPC_DISPLAY_ADDR] = 269 kstrdup(buf, GFP_KERNEL); 270 sin6 = xs_addr_in6(xprt); 271 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 272 break; 273 default: 274 BUG(); 275 } 276 277 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 278 } 279 280 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 281 { 282 struct sockaddr *sap = xs_addr(xprt); 283 char buf[128]; 284 285 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 286 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 287 288 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 289 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 290 } 291 292 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 293 const char *protocol, 294 const char *netid) 295 { 296 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 297 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 298 xs_format_common_peer_addresses(xprt); 299 xs_format_common_peer_ports(xprt); 300 } 301 302 static void xs_update_peer_port(struct rpc_xprt *xprt) 303 { 304 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 305 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 306 307 xs_format_common_peer_ports(xprt); 308 } 309 310 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 311 { 312 unsigned int i; 313 314 for (i = 0; i < RPC_DISPLAY_MAX; i++) 315 switch (i) { 316 case RPC_DISPLAY_PROTO: 317 case RPC_DISPLAY_NETID: 318 continue; 319 default: 320 kfree(xprt->address_strings[i]); 321 } 322 } 323 324 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 325 326 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 327 { 328 struct msghdr msg = { 329 .msg_name = addr, 330 .msg_namelen = addrlen, 331 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 332 }; 333 struct kvec iov = { 334 .iov_base = vec->iov_base + base, 335 .iov_len = vec->iov_len - base, 336 }; 337 338 if (iov.iov_len != 0) 339 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 340 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 341 } 342 343 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p) 344 { 345 ssize_t (*do_sendpage)(struct socket *sock, struct page *page, 346 int offset, size_t size, int flags); 347 struct page **ppage; 348 unsigned int remainder; 349 int err; 350 351 remainder = xdr->page_len - base; 352 base += xdr->page_base; 353 ppage = xdr->pages + (base >> PAGE_SHIFT); 354 base &= ~PAGE_MASK; 355 do_sendpage = sock->ops->sendpage; 356 if (!zerocopy) 357 do_sendpage = sock_no_sendpage; 358 for(;;) { 359 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 360 int flags = XS_SENDMSG_FLAGS; 361 362 remainder -= len; 363 if (remainder != 0 || more) 364 flags |= MSG_MORE; 365 err = do_sendpage(sock, *ppage, base, len, flags); 366 if (remainder == 0 || err != len) 367 break; 368 *sent_p += err; 369 ppage++; 370 base = 0; 371 } 372 if (err > 0) { 373 *sent_p += err; 374 err = 0; 375 } 376 return err; 377 } 378 379 /** 380 * xs_sendpages - write pages directly to a socket 381 * @sock: socket to send on 382 * @addr: UDP only -- address of destination 383 * @addrlen: UDP only -- length of destination address 384 * @xdr: buffer containing this request 385 * @base: starting position in the buffer 386 * @zerocopy: true if it is safe to use sendpage() 387 * @sent_p: return the total number of bytes successfully queued for sending 388 * 389 */ 390 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p) 391 { 392 unsigned int remainder = xdr->len - base; 393 int err = 0; 394 int sent = 0; 395 396 if (unlikely(!sock)) 397 return -ENOTSOCK; 398 399 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 400 if (base != 0) { 401 addr = NULL; 402 addrlen = 0; 403 } 404 405 if (base < xdr->head[0].iov_len || addr != NULL) { 406 unsigned int len = xdr->head[0].iov_len - base; 407 remainder -= len; 408 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 409 if (remainder == 0 || err != len) 410 goto out; 411 *sent_p += err; 412 base = 0; 413 } else 414 base -= xdr->head[0].iov_len; 415 416 if (base < xdr->page_len) { 417 unsigned int len = xdr->page_len - base; 418 remainder -= len; 419 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent); 420 *sent_p += sent; 421 if (remainder == 0 || sent != len) 422 goto out; 423 base = 0; 424 } else 425 base -= xdr->page_len; 426 427 if (base >= xdr->tail[0].iov_len) 428 return 0; 429 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 430 out: 431 if (err > 0) { 432 *sent_p += err; 433 err = 0; 434 } 435 return err; 436 } 437 438 static void xs_nospace_callback(struct rpc_task *task) 439 { 440 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 441 442 transport->inet->sk_write_pending--; 443 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 444 } 445 446 /** 447 * xs_nospace - place task on wait queue if transmit was incomplete 448 * @task: task to put to sleep 449 * 450 */ 451 static int xs_nospace(struct rpc_task *task) 452 { 453 struct rpc_rqst *req = task->tk_rqstp; 454 struct rpc_xprt *xprt = req->rq_xprt; 455 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 456 struct sock *sk = transport->inet; 457 int ret = -EAGAIN; 458 459 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 460 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 461 req->rq_slen); 462 463 /* Protect against races with write_space */ 464 spin_lock_bh(&xprt->transport_lock); 465 466 /* Don't race with disconnect */ 467 if (xprt_connected(xprt)) { 468 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 469 /* 470 * Notify TCP that we're limited by the application 471 * window size 472 */ 473 set_bit(SOCK_NOSPACE, &transport->sock->flags); 474 sk->sk_write_pending++; 475 /* ...and wait for more buffer space */ 476 xprt_wait_for_buffer_space(task, xs_nospace_callback); 477 } 478 } else { 479 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 480 ret = -ENOTCONN; 481 } 482 483 spin_unlock_bh(&xprt->transport_lock); 484 485 /* Race breaker in case memory is freed before above code is called */ 486 sk->sk_write_space(sk); 487 return ret; 488 } 489 490 /* 491 * Construct a stream transport record marker in @buf. 492 */ 493 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 494 { 495 u32 reclen = buf->len - sizeof(rpc_fraghdr); 496 rpc_fraghdr *base = buf->head[0].iov_base; 497 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 498 } 499 500 /** 501 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 502 * @task: RPC task that manages the state of an RPC request 503 * 504 * Return values: 505 * 0: The request has been sent 506 * EAGAIN: The socket was blocked, please call again later to 507 * complete the request 508 * ENOTCONN: Caller needs to invoke connect logic then call again 509 * other: Some other error occured, the request was not sent 510 */ 511 static int xs_local_send_request(struct rpc_task *task) 512 { 513 struct rpc_rqst *req = task->tk_rqstp; 514 struct rpc_xprt *xprt = req->rq_xprt; 515 struct sock_xprt *transport = 516 container_of(xprt, struct sock_xprt, xprt); 517 struct xdr_buf *xdr = &req->rq_snd_buf; 518 int status; 519 int sent = 0; 520 521 xs_encode_stream_record_marker(&req->rq_snd_buf); 522 523 xs_pktdump("packet data:", 524 req->rq_svec->iov_base, req->rq_svec->iov_len); 525 526 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent, 527 true, &sent); 528 dprintk("RPC: %s(%u) = %d\n", 529 __func__, xdr->len - req->rq_bytes_sent, status); 530 if (likely(sent > 0) || status == 0) { 531 req->rq_bytes_sent += sent; 532 req->rq_xmit_bytes_sent += sent; 533 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 534 req->rq_bytes_sent = 0; 535 return 0; 536 } 537 status = -EAGAIN; 538 } 539 540 switch (status) { 541 case -ENOBUFS: 542 case -EAGAIN: 543 status = xs_nospace(task); 544 break; 545 default: 546 dprintk("RPC: sendmsg returned unrecognized error %d\n", 547 -status); 548 case -EPIPE: 549 xs_close(xprt); 550 status = -ENOTCONN; 551 } 552 553 return status; 554 } 555 556 /** 557 * xs_udp_send_request - write an RPC request to a UDP socket 558 * @task: address of RPC task that manages the state of an RPC request 559 * 560 * Return values: 561 * 0: The request has been sent 562 * EAGAIN: The socket was blocked, please call again later to 563 * complete the request 564 * ENOTCONN: Caller needs to invoke connect logic then call again 565 * other: Some other error occurred, the request was not sent 566 */ 567 static int xs_udp_send_request(struct rpc_task *task) 568 { 569 struct rpc_rqst *req = task->tk_rqstp; 570 struct rpc_xprt *xprt = req->rq_xprt; 571 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 572 struct xdr_buf *xdr = &req->rq_snd_buf; 573 int sent = 0; 574 int status; 575 576 xs_pktdump("packet data:", 577 req->rq_svec->iov_base, 578 req->rq_svec->iov_len); 579 580 if (!xprt_bound(xprt)) 581 return -ENOTCONN; 582 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, 583 xdr, req->rq_bytes_sent, true, &sent); 584 585 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 586 xdr->len - req->rq_bytes_sent, status); 587 588 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 589 if (status == -EPERM) 590 goto process_status; 591 592 if (sent > 0 || status == 0) { 593 req->rq_xmit_bytes_sent += sent; 594 if (sent >= req->rq_slen) 595 return 0; 596 /* Still some bytes left; set up for a retry later. */ 597 status = -EAGAIN; 598 } 599 600 process_status: 601 switch (status) { 602 case -ENOTSOCK: 603 status = -ENOTCONN; 604 /* Should we call xs_close() here? */ 605 break; 606 case -EAGAIN: 607 status = xs_nospace(task); 608 break; 609 default: 610 dprintk("RPC: sendmsg returned unrecognized error %d\n", 611 -status); 612 case -ENETUNREACH: 613 case -ENOBUFS: 614 case -EPIPE: 615 case -ECONNREFUSED: 616 case -EPERM: 617 /* When the server has died, an ICMP port unreachable message 618 * prompts ECONNREFUSED. */ 619 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 620 } 621 622 return status; 623 } 624 625 /** 626 * xs_tcp_shutdown - gracefully shut down a TCP socket 627 * @xprt: transport 628 * 629 * Initiates a graceful shutdown of the TCP socket by calling the 630 * equivalent of shutdown(SHUT_WR); 631 */ 632 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 633 { 634 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 635 struct socket *sock = transport->sock; 636 637 if (sock != NULL) { 638 kernel_sock_shutdown(sock, SHUT_WR); 639 trace_rpc_socket_shutdown(xprt, sock); 640 } 641 } 642 643 /** 644 * xs_tcp_send_request - write an RPC request to a TCP socket 645 * @task: address of RPC task that manages the state of an RPC request 646 * 647 * Return values: 648 * 0: The request has been sent 649 * EAGAIN: The socket was blocked, please call again later to 650 * complete the request 651 * ENOTCONN: Caller needs to invoke connect logic then call again 652 * other: Some other error occurred, the request was not sent 653 * 654 * XXX: In the case of soft timeouts, should we eventually give up 655 * if sendmsg is not able to make progress? 656 */ 657 static int xs_tcp_send_request(struct rpc_task *task) 658 { 659 struct rpc_rqst *req = task->tk_rqstp; 660 struct rpc_xprt *xprt = req->rq_xprt; 661 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 662 struct xdr_buf *xdr = &req->rq_snd_buf; 663 bool zerocopy = true; 664 int status; 665 int sent; 666 667 xs_encode_stream_record_marker(&req->rq_snd_buf); 668 669 xs_pktdump("packet data:", 670 req->rq_svec->iov_base, 671 req->rq_svec->iov_len); 672 /* Don't use zero copy if this is a resend. If the RPC call 673 * completes while the socket holds a reference to the pages, 674 * then we may end up resending corrupted data. 675 */ 676 if (task->tk_flags & RPC_TASK_SENT) 677 zerocopy = false; 678 679 /* Continue transmitting the packet/record. We must be careful 680 * to cope with writespace callbacks arriving _after_ we have 681 * called sendmsg(). */ 682 while (1) { 683 sent = 0; 684 status = xs_sendpages(transport->sock, NULL, 0, xdr, 685 req->rq_bytes_sent, zerocopy, &sent); 686 687 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 688 xdr->len - req->rq_bytes_sent, status); 689 690 if (unlikely(sent == 0 && status < 0)) 691 break; 692 693 /* If we've sent the entire packet, immediately 694 * reset the count of bytes sent. */ 695 req->rq_bytes_sent += sent; 696 req->rq_xmit_bytes_sent += sent; 697 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 698 req->rq_bytes_sent = 0; 699 return 0; 700 } 701 702 if (sent != 0) 703 continue; 704 status = -EAGAIN; 705 break; 706 } 707 708 switch (status) { 709 case -ENOTSOCK: 710 status = -ENOTCONN; 711 /* Should we call xs_close() here? */ 712 break; 713 case -ENOBUFS: 714 case -EAGAIN: 715 status = xs_nospace(task); 716 break; 717 default: 718 dprintk("RPC: sendmsg returned unrecognized error %d\n", 719 -status); 720 case -ECONNRESET: 721 xs_tcp_shutdown(xprt); 722 case -ECONNREFUSED: 723 case -ENOTCONN: 724 case -EPIPE: 725 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 726 } 727 728 return status; 729 } 730 731 /** 732 * xs_tcp_release_xprt - clean up after a tcp transmission 733 * @xprt: transport 734 * @task: rpc task 735 * 736 * This cleans up if an error causes us to abort the transmission of a request. 737 * In this case, the socket may need to be reset in order to avoid confusing 738 * the server. 739 */ 740 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 741 { 742 struct rpc_rqst *req; 743 744 if (task != xprt->snd_task) 745 return; 746 if (task == NULL) 747 goto out_release; 748 req = task->tk_rqstp; 749 if (req == NULL) 750 goto out_release; 751 if (req->rq_bytes_sent == 0) 752 goto out_release; 753 if (req->rq_bytes_sent == req->rq_snd_buf.len) 754 goto out_release; 755 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 756 out_release: 757 xprt_release_xprt(xprt, task); 758 } 759 760 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 761 { 762 transport->old_data_ready = sk->sk_data_ready; 763 transport->old_state_change = sk->sk_state_change; 764 transport->old_write_space = sk->sk_write_space; 765 transport->old_error_report = sk->sk_error_report; 766 } 767 768 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 769 { 770 sk->sk_data_ready = transport->old_data_ready; 771 sk->sk_state_change = transport->old_state_change; 772 sk->sk_write_space = transport->old_write_space; 773 sk->sk_error_report = transport->old_error_report; 774 } 775 776 /** 777 * xs_error_report - callback to handle TCP socket state errors 778 * @sk: socket 779 * 780 * Note: we don't call sock_error() since there may be a rpc_task 781 * using the socket, and so we don't want to clear sk->sk_err. 782 */ 783 static void xs_error_report(struct sock *sk) 784 { 785 struct rpc_xprt *xprt; 786 int err; 787 788 read_lock_bh(&sk->sk_callback_lock); 789 if (!(xprt = xprt_from_sock(sk))) 790 goto out; 791 792 err = -sk->sk_err; 793 if (err == 0) 794 goto out; 795 dprintk("RPC: xs_error_report client %p, error=%d...\n", 796 xprt, -err); 797 trace_rpc_socket_error(xprt, sk->sk_socket, err); 798 if (test_bit(XPRT_CONNECTION_REUSE, &xprt->state)) 799 goto out; 800 xprt_wake_pending_tasks(xprt, err); 801 out: 802 read_unlock_bh(&sk->sk_callback_lock); 803 } 804 805 static void xs_reset_transport(struct sock_xprt *transport) 806 { 807 struct socket *sock = transport->sock; 808 struct sock *sk = transport->inet; 809 810 if (sk == NULL) 811 return; 812 813 transport->srcport = 0; 814 815 write_lock_bh(&sk->sk_callback_lock); 816 transport->inet = NULL; 817 transport->sock = NULL; 818 819 sk->sk_user_data = NULL; 820 821 xs_restore_old_callbacks(transport, sk); 822 write_unlock_bh(&sk->sk_callback_lock); 823 824 trace_rpc_socket_close(&transport->xprt, sock); 825 sock_release(sock); 826 } 827 828 /** 829 * xs_close - close a socket 830 * @xprt: transport 831 * 832 * This is used when all requests are complete; ie, no DRC state remains 833 * on the server we want to save. 834 * 835 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 836 * xs_reset_transport() zeroing the socket from underneath a writer. 837 */ 838 static void xs_close(struct rpc_xprt *xprt) 839 { 840 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 841 842 dprintk("RPC: xs_close xprt %p\n", xprt); 843 844 cancel_delayed_work_sync(&transport->connect_worker); 845 846 xs_reset_transport(transport); 847 xprt->reestablish_timeout = 0; 848 849 smp_mb__before_atomic(); 850 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 851 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 852 clear_bit(XPRT_CLOSING, &xprt->state); 853 smp_mb__after_atomic(); 854 xprt_disconnect_done(xprt); 855 } 856 857 static void xs_tcp_close(struct rpc_xprt *xprt) 858 { 859 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 860 xs_close(xprt); 861 else 862 xs_tcp_shutdown(xprt); 863 } 864 865 static void xs_xprt_free(struct rpc_xprt *xprt) 866 { 867 xs_free_peer_addresses(xprt); 868 xprt_free(xprt); 869 } 870 871 /** 872 * xs_destroy - prepare to shutdown a transport 873 * @xprt: doomed transport 874 * 875 */ 876 static void xs_destroy(struct rpc_xprt *xprt) 877 { 878 dprintk("RPC: xs_destroy xprt %p\n", xprt); 879 880 xs_close(xprt); 881 xs_xprt_free(xprt); 882 module_put(THIS_MODULE); 883 } 884 885 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 886 { 887 struct xdr_skb_reader desc = { 888 .skb = skb, 889 .offset = sizeof(rpc_fraghdr), 890 .count = skb->len - sizeof(rpc_fraghdr), 891 }; 892 893 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 894 return -1; 895 if (desc.count) 896 return -1; 897 return 0; 898 } 899 900 /** 901 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets 902 * @sk: socket with data to read 903 * @len: how much data to read 904 * 905 * Currently this assumes we can read the whole reply in a single gulp. 906 */ 907 static void xs_local_data_ready(struct sock *sk) 908 { 909 struct rpc_task *task; 910 struct rpc_xprt *xprt; 911 struct rpc_rqst *rovr; 912 struct sk_buff *skb; 913 int err, repsize, copied; 914 u32 _xid; 915 __be32 *xp; 916 917 read_lock_bh(&sk->sk_callback_lock); 918 dprintk("RPC: %s...\n", __func__); 919 xprt = xprt_from_sock(sk); 920 if (xprt == NULL) 921 goto out; 922 923 skb = skb_recv_datagram(sk, 0, 1, &err); 924 if (skb == NULL) 925 goto out; 926 927 repsize = skb->len - sizeof(rpc_fraghdr); 928 if (repsize < 4) { 929 dprintk("RPC: impossible RPC reply size %d\n", repsize); 930 goto dropit; 931 } 932 933 /* Copy the XID from the skb... */ 934 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 935 if (xp == NULL) 936 goto dropit; 937 938 /* Look up and lock the request corresponding to the given XID */ 939 spin_lock(&xprt->transport_lock); 940 rovr = xprt_lookup_rqst(xprt, *xp); 941 if (!rovr) 942 goto out_unlock; 943 task = rovr->rq_task; 944 945 copied = rovr->rq_private_buf.buflen; 946 if (copied > repsize) 947 copied = repsize; 948 949 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 950 dprintk("RPC: sk_buff copy failed\n"); 951 goto out_unlock; 952 } 953 954 xprt_complete_rqst(task, copied); 955 956 out_unlock: 957 spin_unlock(&xprt->transport_lock); 958 dropit: 959 skb_free_datagram(sk, skb); 960 out: 961 read_unlock_bh(&sk->sk_callback_lock); 962 } 963 964 /** 965 * xs_udp_data_ready - "data ready" callback for UDP sockets 966 * @sk: socket with data to read 967 * @len: how much data to read 968 * 969 */ 970 static void xs_udp_data_ready(struct sock *sk) 971 { 972 struct rpc_task *task; 973 struct rpc_xprt *xprt; 974 struct rpc_rqst *rovr; 975 struct sk_buff *skb; 976 int err, repsize, copied; 977 u32 _xid; 978 __be32 *xp; 979 980 read_lock_bh(&sk->sk_callback_lock); 981 dprintk("RPC: xs_udp_data_ready...\n"); 982 if (!(xprt = xprt_from_sock(sk))) 983 goto out; 984 985 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 986 goto out; 987 988 repsize = skb->len - sizeof(struct udphdr); 989 if (repsize < 4) { 990 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 991 goto dropit; 992 } 993 994 /* Copy the XID from the skb... */ 995 xp = skb_header_pointer(skb, sizeof(struct udphdr), 996 sizeof(_xid), &_xid); 997 if (xp == NULL) 998 goto dropit; 999 1000 /* Look up and lock the request corresponding to the given XID */ 1001 spin_lock(&xprt->transport_lock); 1002 rovr = xprt_lookup_rqst(xprt, *xp); 1003 if (!rovr) 1004 goto out_unlock; 1005 task = rovr->rq_task; 1006 1007 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1008 copied = repsize; 1009 1010 /* Suck it into the iovec, verify checksum if not done by hw. */ 1011 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1012 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 1013 goto out_unlock; 1014 } 1015 1016 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 1017 1018 xprt_adjust_cwnd(xprt, task, copied); 1019 xprt_complete_rqst(task, copied); 1020 1021 out_unlock: 1022 spin_unlock(&xprt->transport_lock); 1023 dropit: 1024 skb_free_datagram(sk, skb); 1025 out: 1026 read_unlock_bh(&sk->sk_callback_lock); 1027 } 1028 1029 /* 1030 * Helper function to force a TCP close if the server is sending 1031 * junk and/or it has put us in CLOSE_WAIT 1032 */ 1033 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1034 { 1035 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1036 xprt_force_disconnect(xprt); 1037 } 1038 1039 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1040 { 1041 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1042 size_t len, used; 1043 char *p; 1044 1045 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1046 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1047 used = xdr_skb_read_bits(desc, p, len); 1048 transport->tcp_offset += used; 1049 if (used != len) 1050 return; 1051 1052 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1053 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1054 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1055 else 1056 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1057 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1058 1059 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1060 transport->tcp_offset = 0; 1061 1062 /* Sanity check of the record length */ 1063 if (unlikely(transport->tcp_reclen < 8)) { 1064 dprintk("RPC: invalid TCP record fragment length\n"); 1065 xs_tcp_force_close(xprt); 1066 return; 1067 } 1068 dprintk("RPC: reading TCP record fragment of length %d\n", 1069 transport->tcp_reclen); 1070 } 1071 1072 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1073 { 1074 if (transport->tcp_offset == transport->tcp_reclen) { 1075 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1076 transport->tcp_offset = 0; 1077 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1078 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1079 transport->tcp_flags |= TCP_RCV_COPY_XID; 1080 transport->tcp_copied = 0; 1081 } 1082 } 1083 } 1084 1085 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1086 { 1087 size_t len, used; 1088 char *p; 1089 1090 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1091 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1092 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1093 used = xdr_skb_read_bits(desc, p, len); 1094 transport->tcp_offset += used; 1095 if (used != len) 1096 return; 1097 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1098 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1099 transport->tcp_copied = 4; 1100 dprintk("RPC: reading %s XID %08x\n", 1101 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1102 : "request with", 1103 ntohl(transport->tcp_xid)); 1104 xs_tcp_check_fraghdr(transport); 1105 } 1106 1107 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1108 struct xdr_skb_reader *desc) 1109 { 1110 size_t len, used; 1111 u32 offset; 1112 char *p; 1113 1114 /* 1115 * We want transport->tcp_offset to be 8 at the end of this routine 1116 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1117 * When this function is called for the first time, 1118 * transport->tcp_offset is 4 (after having already read the xid). 1119 */ 1120 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1121 len = sizeof(transport->tcp_calldir) - offset; 1122 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1123 p = ((char *) &transport->tcp_calldir) + offset; 1124 used = xdr_skb_read_bits(desc, p, len); 1125 transport->tcp_offset += used; 1126 if (used != len) 1127 return; 1128 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1129 /* 1130 * We don't yet have the XDR buffer, so we will write the calldir 1131 * out after we get the buffer from the 'struct rpc_rqst' 1132 */ 1133 switch (ntohl(transport->tcp_calldir)) { 1134 case RPC_REPLY: 1135 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1136 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1137 transport->tcp_flags |= TCP_RPC_REPLY; 1138 break; 1139 case RPC_CALL: 1140 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1141 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1142 transport->tcp_flags &= ~TCP_RPC_REPLY; 1143 break; 1144 default: 1145 dprintk("RPC: invalid request message type\n"); 1146 xs_tcp_force_close(&transport->xprt); 1147 } 1148 xs_tcp_check_fraghdr(transport); 1149 } 1150 1151 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1152 struct xdr_skb_reader *desc, 1153 struct rpc_rqst *req) 1154 { 1155 struct sock_xprt *transport = 1156 container_of(xprt, struct sock_xprt, xprt); 1157 struct xdr_buf *rcvbuf; 1158 size_t len; 1159 ssize_t r; 1160 1161 rcvbuf = &req->rq_private_buf; 1162 1163 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1164 /* 1165 * Save the RPC direction in the XDR buffer 1166 */ 1167 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1168 &transport->tcp_calldir, 1169 sizeof(transport->tcp_calldir)); 1170 transport->tcp_copied += sizeof(transport->tcp_calldir); 1171 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1172 } 1173 1174 len = desc->count; 1175 if (len > transport->tcp_reclen - transport->tcp_offset) { 1176 struct xdr_skb_reader my_desc; 1177 1178 len = transport->tcp_reclen - transport->tcp_offset; 1179 memcpy(&my_desc, desc, sizeof(my_desc)); 1180 my_desc.count = len; 1181 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1182 &my_desc, xdr_skb_read_bits); 1183 desc->count -= r; 1184 desc->offset += r; 1185 } else 1186 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1187 desc, xdr_skb_read_bits); 1188 1189 if (r > 0) { 1190 transport->tcp_copied += r; 1191 transport->tcp_offset += r; 1192 } 1193 if (r != len) { 1194 /* Error when copying to the receive buffer, 1195 * usually because we weren't able to allocate 1196 * additional buffer pages. All we can do now 1197 * is turn off TCP_RCV_COPY_DATA, so the request 1198 * will not receive any additional updates, 1199 * and time out. 1200 * Any remaining data from this record will 1201 * be discarded. 1202 */ 1203 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1204 dprintk("RPC: XID %08x truncated request\n", 1205 ntohl(transport->tcp_xid)); 1206 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1207 "tcp_offset = %u, tcp_reclen = %u\n", 1208 xprt, transport->tcp_copied, 1209 transport->tcp_offset, transport->tcp_reclen); 1210 return; 1211 } 1212 1213 dprintk("RPC: XID %08x read %Zd bytes\n", 1214 ntohl(transport->tcp_xid), r); 1215 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1216 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1217 transport->tcp_offset, transport->tcp_reclen); 1218 1219 if (transport->tcp_copied == req->rq_private_buf.buflen) 1220 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1221 else if (transport->tcp_offset == transport->tcp_reclen) { 1222 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1223 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1224 } 1225 } 1226 1227 /* 1228 * Finds the request corresponding to the RPC xid and invokes the common 1229 * tcp read code to read the data. 1230 */ 1231 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1232 struct xdr_skb_reader *desc) 1233 { 1234 struct sock_xprt *transport = 1235 container_of(xprt, struct sock_xprt, xprt); 1236 struct rpc_rqst *req; 1237 1238 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1239 1240 /* Find and lock the request corresponding to this xid */ 1241 spin_lock(&xprt->transport_lock); 1242 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1243 if (!req) { 1244 dprintk("RPC: XID %08x request not found!\n", 1245 ntohl(transport->tcp_xid)); 1246 spin_unlock(&xprt->transport_lock); 1247 return -1; 1248 } 1249 1250 xs_tcp_read_common(xprt, desc, req); 1251 1252 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1253 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1254 1255 spin_unlock(&xprt->transport_lock); 1256 return 0; 1257 } 1258 1259 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1260 /* 1261 * Obtains an rpc_rqst previously allocated and invokes the common 1262 * tcp read code to read the data. The result is placed in the callback 1263 * queue. 1264 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1265 * connection and return -1. 1266 */ 1267 static int xs_tcp_read_callback(struct rpc_xprt *xprt, 1268 struct xdr_skb_reader *desc) 1269 { 1270 struct sock_xprt *transport = 1271 container_of(xprt, struct sock_xprt, xprt); 1272 struct rpc_rqst *req; 1273 1274 /* Look up and lock the request corresponding to the given XID */ 1275 spin_lock(&xprt->transport_lock); 1276 req = xprt_lookup_bc_request(xprt, transport->tcp_xid); 1277 if (req == NULL) { 1278 spin_unlock(&xprt->transport_lock); 1279 printk(KERN_WARNING "Callback slot table overflowed\n"); 1280 xprt_force_disconnect(xprt); 1281 return -1; 1282 } 1283 1284 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1285 xs_tcp_read_common(xprt, desc, req); 1286 1287 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1288 xprt_complete_bc_request(req, transport->tcp_copied); 1289 spin_unlock(&xprt->transport_lock); 1290 1291 return 0; 1292 } 1293 1294 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1295 struct xdr_skb_reader *desc) 1296 { 1297 struct sock_xprt *transport = 1298 container_of(xprt, struct sock_xprt, xprt); 1299 1300 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1301 xs_tcp_read_reply(xprt, desc) : 1302 xs_tcp_read_callback(xprt, desc); 1303 } 1304 #else 1305 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1306 struct xdr_skb_reader *desc) 1307 { 1308 return xs_tcp_read_reply(xprt, desc); 1309 } 1310 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1311 1312 /* 1313 * Read data off the transport. This can be either an RPC_CALL or an 1314 * RPC_REPLY. Relay the processing to helper functions. 1315 */ 1316 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1317 struct xdr_skb_reader *desc) 1318 { 1319 struct sock_xprt *transport = 1320 container_of(xprt, struct sock_xprt, xprt); 1321 1322 if (_xs_tcp_read_data(xprt, desc) == 0) 1323 xs_tcp_check_fraghdr(transport); 1324 else { 1325 /* 1326 * The transport_lock protects the request handling. 1327 * There's no need to hold it to update the tcp_flags. 1328 */ 1329 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1330 } 1331 } 1332 1333 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1334 { 1335 size_t len; 1336 1337 len = transport->tcp_reclen - transport->tcp_offset; 1338 if (len > desc->count) 1339 len = desc->count; 1340 desc->count -= len; 1341 desc->offset += len; 1342 transport->tcp_offset += len; 1343 dprintk("RPC: discarded %Zu bytes\n", len); 1344 xs_tcp_check_fraghdr(transport); 1345 } 1346 1347 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1348 { 1349 struct rpc_xprt *xprt = rd_desc->arg.data; 1350 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1351 struct xdr_skb_reader desc = { 1352 .skb = skb, 1353 .offset = offset, 1354 .count = len, 1355 }; 1356 1357 dprintk("RPC: xs_tcp_data_recv started\n"); 1358 do { 1359 trace_xs_tcp_data_recv(transport); 1360 /* Read in a new fragment marker if necessary */ 1361 /* Can we ever really expect to get completely empty fragments? */ 1362 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1363 xs_tcp_read_fraghdr(xprt, &desc); 1364 continue; 1365 } 1366 /* Read in the xid if necessary */ 1367 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1368 xs_tcp_read_xid(transport, &desc); 1369 continue; 1370 } 1371 /* Read in the call/reply flag */ 1372 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1373 xs_tcp_read_calldir(transport, &desc); 1374 continue; 1375 } 1376 /* Read in the request data */ 1377 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1378 xs_tcp_read_data(xprt, &desc); 1379 continue; 1380 } 1381 /* Skip over any trailing bytes on short reads */ 1382 xs_tcp_read_discard(transport, &desc); 1383 } while (desc.count); 1384 trace_xs_tcp_data_recv(transport); 1385 dprintk("RPC: xs_tcp_data_recv done\n"); 1386 return len - desc.count; 1387 } 1388 1389 /** 1390 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1391 * @sk: socket with data to read 1392 * @bytes: how much data to read 1393 * 1394 */ 1395 static void xs_tcp_data_ready(struct sock *sk) 1396 { 1397 struct rpc_xprt *xprt; 1398 read_descriptor_t rd_desc; 1399 int read; 1400 unsigned long total = 0; 1401 1402 dprintk("RPC: xs_tcp_data_ready...\n"); 1403 1404 read_lock_bh(&sk->sk_callback_lock); 1405 if (!(xprt = xprt_from_sock(sk))) { 1406 read = 0; 1407 goto out; 1408 } 1409 /* Any data means we had a useful conversation, so 1410 * the we don't need to delay the next reconnect 1411 */ 1412 if (xprt->reestablish_timeout) 1413 xprt->reestablish_timeout = 0; 1414 1415 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1416 rd_desc.arg.data = xprt; 1417 do { 1418 rd_desc.count = 65536; 1419 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1420 if (read > 0) 1421 total += read; 1422 } while (read > 0); 1423 out: 1424 trace_xs_tcp_data_ready(xprt, read, total); 1425 read_unlock_bh(&sk->sk_callback_lock); 1426 } 1427 1428 /* 1429 * Do the equivalent of linger/linger2 handling for dealing with 1430 * broken servers that don't close the socket in a timely 1431 * fashion 1432 */ 1433 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1434 unsigned long timeout) 1435 { 1436 struct sock_xprt *transport; 1437 1438 if (xprt_test_and_set_connecting(xprt)) 1439 return; 1440 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1441 transport = container_of(xprt, struct sock_xprt, xprt); 1442 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1443 timeout); 1444 } 1445 1446 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1447 { 1448 struct sock_xprt *transport; 1449 1450 transport = container_of(xprt, struct sock_xprt, xprt); 1451 1452 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1453 !cancel_delayed_work(&transport->connect_worker)) 1454 return; 1455 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1456 xprt_clear_connecting(xprt); 1457 } 1458 1459 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1460 { 1461 smp_mb__before_atomic(); 1462 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1463 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1464 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1465 clear_bit(XPRT_CLOSING, &xprt->state); 1466 smp_mb__after_atomic(); 1467 } 1468 1469 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1470 { 1471 xs_sock_reset_connection_flags(xprt); 1472 /* Mark transport as closed and wake up all pending tasks */ 1473 xprt_disconnect_done(xprt); 1474 } 1475 1476 /** 1477 * xs_tcp_state_change - callback to handle TCP socket state changes 1478 * @sk: socket whose state has changed 1479 * 1480 */ 1481 static void xs_tcp_state_change(struct sock *sk) 1482 { 1483 struct rpc_xprt *xprt; 1484 1485 read_lock_bh(&sk->sk_callback_lock); 1486 if (!(xprt = xprt_from_sock(sk))) 1487 goto out; 1488 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1489 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1490 sk->sk_state, xprt_connected(xprt), 1491 sock_flag(sk, SOCK_DEAD), 1492 sock_flag(sk, SOCK_ZAPPED), 1493 sk->sk_shutdown); 1494 1495 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1496 switch (sk->sk_state) { 1497 case TCP_ESTABLISHED: 1498 spin_lock(&xprt->transport_lock); 1499 if (!xprt_test_and_set_connected(xprt)) { 1500 struct sock_xprt *transport = container_of(xprt, 1501 struct sock_xprt, xprt); 1502 1503 /* Reset TCP record info */ 1504 transport->tcp_offset = 0; 1505 transport->tcp_reclen = 0; 1506 transport->tcp_copied = 0; 1507 transport->tcp_flags = 1508 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1509 xprt->connect_cookie++; 1510 1511 xprt_wake_pending_tasks(xprt, -EAGAIN); 1512 } 1513 spin_unlock(&xprt->transport_lock); 1514 break; 1515 case TCP_FIN_WAIT1: 1516 /* The client initiated a shutdown of the socket */ 1517 xprt->connect_cookie++; 1518 xprt->reestablish_timeout = 0; 1519 set_bit(XPRT_CLOSING, &xprt->state); 1520 smp_mb__before_atomic(); 1521 clear_bit(XPRT_CONNECTED, &xprt->state); 1522 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1523 smp_mb__after_atomic(); 1524 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1525 break; 1526 case TCP_CLOSE_WAIT: 1527 /* The server initiated a shutdown of the socket */ 1528 xprt->connect_cookie++; 1529 clear_bit(XPRT_CONNECTED, &xprt->state); 1530 xs_tcp_force_close(xprt); 1531 case TCP_CLOSING: 1532 /* 1533 * If the server closed down the connection, make sure that 1534 * we back off before reconnecting 1535 */ 1536 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1537 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1538 break; 1539 case TCP_LAST_ACK: 1540 set_bit(XPRT_CLOSING, &xprt->state); 1541 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1542 smp_mb__before_atomic(); 1543 clear_bit(XPRT_CONNECTED, &xprt->state); 1544 smp_mb__after_atomic(); 1545 break; 1546 case TCP_CLOSE: 1547 xs_tcp_cancel_linger_timeout(xprt); 1548 xs_sock_mark_closed(xprt); 1549 } 1550 out: 1551 read_unlock_bh(&sk->sk_callback_lock); 1552 } 1553 1554 static void xs_write_space(struct sock *sk) 1555 { 1556 struct socket *sock; 1557 struct rpc_xprt *xprt; 1558 1559 if (unlikely(!(sock = sk->sk_socket))) 1560 return; 1561 clear_bit(SOCK_NOSPACE, &sock->flags); 1562 1563 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1564 return; 1565 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1566 return; 1567 1568 xprt_write_space(xprt); 1569 } 1570 1571 /** 1572 * xs_udp_write_space - callback invoked when socket buffer space 1573 * becomes available 1574 * @sk: socket whose state has changed 1575 * 1576 * Called when more output buffer space is available for this socket. 1577 * We try not to wake our writers until they can make "significant" 1578 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1579 * with a bunch of small requests. 1580 */ 1581 static void xs_udp_write_space(struct sock *sk) 1582 { 1583 read_lock_bh(&sk->sk_callback_lock); 1584 1585 /* from net/core/sock.c:sock_def_write_space */ 1586 if (sock_writeable(sk)) 1587 xs_write_space(sk); 1588 1589 read_unlock_bh(&sk->sk_callback_lock); 1590 } 1591 1592 /** 1593 * xs_tcp_write_space - callback invoked when socket buffer space 1594 * becomes available 1595 * @sk: socket whose state has changed 1596 * 1597 * Called when more output buffer space is available for this socket. 1598 * We try not to wake our writers until they can make "significant" 1599 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1600 * with a bunch of small requests. 1601 */ 1602 static void xs_tcp_write_space(struct sock *sk) 1603 { 1604 read_lock_bh(&sk->sk_callback_lock); 1605 1606 /* from net/core/stream.c:sk_stream_write_space */ 1607 if (sk_stream_is_writeable(sk)) 1608 xs_write_space(sk); 1609 1610 read_unlock_bh(&sk->sk_callback_lock); 1611 } 1612 1613 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1614 { 1615 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1616 struct sock *sk = transport->inet; 1617 1618 if (transport->rcvsize) { 1619 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1620 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1621 } 1622 if (transport->sndsize) { 1623 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1624 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1625 sk->sk_write_space(sk); 1626 } 1627 } 1628 1629 /** 1630 * xs_udp_set_buffer_size - set send and receive limits 1631 * @xprt: generic transport 1632 * @sndsize: requested size of send buffer, in bytes 1633 * @rcvsize: requested size of receive buffer, in bytes 1634 * 1635 * Set socket send and receive buffer size limits. 1636 */ 1637 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1638 { 1639 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1640 1641 transport->sndsize = 0; 1642 if (sndsize) 1643 transport->sndsize = sndsize + 1024; 1644 transport->rcvsize = 0; 1645 if (rcvsize) 1646 transport->rcvsize = rcvsize + 1024; 1647 1648 xs_udp_do_set_buffer_size(xprt); 1649 } 1650 1651 /** 1652 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1653 * @task: task that timed out 1654 * 1655 * Adjust the congestion window after a retransmit timeout has occurred. 1656 */ 1657 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1658 { 1659 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1660 } 1661 1662 static unsigned short xs_get_random_port(void) 1663 { 1664 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1665 unsigned short rand = (unsigned short) prandom_u32() % range; 1666 return rand + xprt_min_resvport; 1667 } 1668 1669 /** 1670 * xs_set_port - reset the port number in the remote endpoint address 1671 * @xprt: generic transport 1672 * @port: new port number 1673 * 1674 */ 1675 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1676 { 1677 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1678 1679 rpc_set_port(xs_addr(xprt), port); 1680 xs_update_peer_port(xprt); 1681 } 1682 1683 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1684 { 1685 unsigned short port = transport->srcport; 1686 1687 if (port == 0 && transport->xprt.resvport) 1688 port = xs_get_random_port(); 1689 return port; 1690 } 1691 1692 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1693 { 1694 if (transport->srcport != 0) 1695 transport->srcport = 0; 1696 if (!transport->xprt.resvport) 1697 return 0; 1698 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1699 return xprt_max_resvport; 1700 return --port; 1701 } 1702 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1703 { 1704 struct sockaddr_storage myaddr; 1705 int err, nloop = 0; 1706 unsigned short port = xs_get_srcport(transport); 1707 unsigned short last; 1708 1709 /* 1710 * If we are asking for any ephemeral port (i.e. port == 0 && 1711 * transport->xprt.resvport == 0), don't bind. Let the local 1712 * port selection happen implicitly when the socket is used 1713 * (for example at connect time). 1714 * 1715 * This ensures that we can continue to establish TCP 1716 * connections even when all local ephemeral ports are already 1717 * a part of some TCP connection. This makes no difference 1718 * for UDP sockets, but also doens't harm them. 1719 * 1720 * If we're asking for any reserved port (i.e. port == 0 && 1721 * transport->xprt.resvport == 1) xs_get_srcport above will 1722 * ensure that port is non-zero and we will bind as needed. 1723 */ 1724 if (port == 0) 1725 return 0; 1726 1727 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1728 do { 1729 rpc_set_port((struct sockaddr *)&myaddr, port); 1730 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1731 transport->xprt.addrlen); 1732 if (err == 0) { 1733 transport->srcport = port; 1734 break; 1735 } 1736 last = port; 1737 port = xs_next_srcport(transport, port); 1738 if (port > last) 1739 nloop++; 1740 } while (err == -EADDRINUSE && nloop != 2); 1741 1742 if (myaddr.ss_family == AF_INET) 1743 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1744 &((struct sockaddr_in *)&myaddr)->sin_addr, 1745 port, err ? "failed" : "ok", err); 1746 else 1747 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1748 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1749 port, err ? "failed" : "ok", err); 1750 return err; 1751 } 1752 1753 /* 1754 * We don't support autobind on AF_LOCAL sockets 1755 */ 1756 static void xs_local_rpcbind(struct rpc_task *task) 1757 { 1758 rcu_read_lock(); 1759 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); 1760 rcu_read_unlock(); 1761 } 1762 1763 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1764 { 1765 } 1766 1767 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1768 static struct lock_class_key xs_key[2]; 1769 static struct lock_class_key xs_slock_key[2]; 1770 1771 static inline void xs_reclassify_socketu(struct socket *sock) 1772 { 1773 struct sock *sk = sock->sk; 1774 1775 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1776 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1777 } 1778 1779 static inline void xs_reclassify_socket4(struct socket *sock) 1780 { 1781 struct sock *sk = sock->sk; 1782 1783 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1784 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1785 } 1786 1787 static inline void xs_reclassify_socket6(struct socket *sock) 1788 { 1789 struct sock *sk = sock->sk; 1790 1791 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1792 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1793 } 1794 1795 static inline void xs_reclassify_socket(int family, struct socket *sock) 1796 { 1797 WARN_ON_ONCE(sock_owned_by_user(sock->sk)); 1798 if (sock_owned_by_user(sock->sk)) 1799 return; 1800 1801 switch (family) { 1802 case AF_LOCAL: 1803 xs_reclassify_socketu(sock); 1804 break; 1805 case AF_INET: 1806 xs_reclassify_socket4(sock); 1807 break; 1808 case AF_INET6: 1809 xs_reclassify_socket6(sock); 1810 break; 1811 } 1812 } 1813 #else 1814 static inline void xs_reclassify_socketu(struct socket *sock) 1815 { 1816 } 1817 1818 static inline void xs_reclassify_socket4(struct socket *sock) 1819 { 1820 } 1821 1822 static inline void xs_reclassify_socket6(struct socket *sock) 1823 { 1824 } 1825 1826 static inline void xs_reclassify_socket(int family, struct socket *sock) 1827 { 1828 } 1829 #endif 1830 1831 static void xs_dummy_setup_socket(struct work_struct *work) 1832 { 1833 } 1834 1835 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1836 struct sock_xprt *transport, int family, int type, int protocol) 1837 { 1838 struct socket *sock; 1839 int err; 1840 1841 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1842 if (err < 0) { 1843 dprintk("RPC: can't create %d transport socket (%d).\n", 1844 protocol, -err); 1845 goto out; 1846 } 1847 xs_reclassify_socket(family, sock); 1848 1849 err = xs_bind(transport, sock); 1850 if (err) { 1851 sock_release(sock); 1852 goto out; 1853 } 1854 1855 return sock; 1856 out: 1857 return ERR_PTR(err); 1858 } 1859 1860 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1861 struct socket *sock) 1862 { 1863 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1864 xprt); 1865 1866 if (!transport->inet) { 1867 struct sock *sk = sock->sk; 1868 1869 write_lock_bh(&sk->sk_callback_lock); 1870 1871 xs_save_old_callbacks(transport, sk); 1872 1873 sk->sk_user_data = xprt; 1874 sk->sk_data_ready = xs_local_data_ready; 1875 sk->sk_write_space = xs_udp_write_space; 1876 sk->sk_error_report = xs_error_report; 1877 sk->sk_allocation = GFP_ATOMIC; 1878 1879 xprt_clear_connected(xprt); 1880 1881 /* Reset to new socket */ 1882 transport->sock = sock; 1883 transport->inet = sk; 1884 1885 write_unlock_bh(&sk->sk_callback_lock); 1886 } 1887 1888 /* Tell the socket layer to start connecting... */ 1889 xprt->stat.connect_count++; 1890 xprt->stat.connect_start = jiffies; 1891 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1892 } 1893 1894 /** 1895 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1896 * @xprt: RPC transport to connect 1897 * @transport: socket transport to connect 1898 * @create_sock: function to create a socket of the correct type 1899 */ 1900 static int xs_local_setup_socket(struct sock_xprt *transport) 1901 { 1902 struct rpc_xprt *xprt = &transport->xprt; 1903 struct socket *sock; 1904 int status = -EIO; 1905 1906 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1907 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1908 SOCK_STREAM, 0, &sock, 1); 1909 if (status < 0) { 1910 dprintk("RPC: can't create AF_LOCAL " 1911 "transport socket (%d).\n", -status); 1912 goto out; 1913 } 1914 xs_reclassify_socketu(sock); 1915 1916 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1917 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1918 1919 status = xs_local_finish_connecting(xprt, sock); 1920 trace_rpc_socket_connect(xprt, sock, status); 1921 switch (status) { 1922 case 0: 1923 dprintk("RPC: xprt %p connected to %s\n", 1924 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1925 xprt_set_connected(xprt); 1926 case -ENOBUFS: 1927 break; 1928 case -ENOENT: 1929 dprintk("RPC: xprt %p: socket %s does not exist\n", 1930 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1931 break; 1932 case -ECONNREFUSED: 1933 dprintk("RPC: xprt %p: connection refused for %s\n", 1934 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1935 break; 1936 default: 1937 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1938 __func__, -status, 1939 xprt->address_strings[RPC_DISPLAY_ADDR]); 1940 } 1941 1942 out: 1943 xprt_clear_connecting(xprt); 1944 xprt_wake_pending_tasks(xprt, status); 1945 return status; 1946 } 1947 1948 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 1949 { 1950 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1951 int ret; 1952 1953 if (RPC_IS_ASYNC(task)) { 1954 /* 1955 * We want the AF_LOCAL connect to be resolved in the 1956 * filesystem namespace of the process making the rpc 1957 * call. Thus we connect synchronously. 1958 * 1959 * If we want to support asynchronous AF_LOCAL calls, 1960 * we'll need to figure out how to pass a namespace to 1961 * connect. 1962 */ 1963 rpc_exit(task, -ENOTCONN); 1964 return; 1965 } 1966 ret = xs_local_setup_socket(transport); 1967 if (ret && !RPC_IS_SOFTCONN(task)) 1968 msleep_interruptible(15000); 1969 } 1970 1971 #ifdef CONFIG_SUNRPC_SWAP 1972 static void xs_set_memalloc(struct rpc_xprt *xprt) 1973 { 1974 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1975 xprt); 1976 1977 if (xprt->swapper) 1978 sk_set_memalloc(transport->inet); 1979 } 1980 1981 /** 1982 * xs_swapper - Tag this transport as being used for swap. 1983 * @xprt: transport to tag 1984 * @enable: enable/disable 1985 * 1986 */ 1987 int xs_swapper(struct rpc_xprt *xprt, int enable) 1988 { 1989 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1990 xprt); 1991 int err = 0; 1992 1993 if (enable) { 1994 xprt->swapper++; 1995 xs_set_memalloc(xprt); 1996 } else if (xprt->swapper) { 1997 xprt->swapper--; 1998 sk_clear_memalloc(transport->inet); 1999 } 2000 2001 return err; 2002 } 2003 EXPORT_SYMBOL_GPL(xs_swapper); 2004 #else 2005 static void xs_set_memalloc(struct rpc_xprt *xprt) 2006 { 2007 } 2008 #endif 2009 2010 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2011 { 2012 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2013 2014 if (!transport->inet) { 2015 struct sock *sk = sock->sk; 2016 2017 write_lock_bh(&sk->sk_callback_lock); 2018 2019 xs_save_old_callbacks(transport, sk); 2020 2021 sk->sk_user_data = xprt; 2022 sk->sk_data_ready = xs_udp_data_ready; 2023 sk->sk_write_space = xs_udp_write_space; 2024 sk->sk_allocation = GFP_ATOMIC; 2025 2026 xprt_set_connected(xprt); 2027 2028 /* Reset to new socket */ 2029 transport->sock = sock; 2030 transport->inet = sk; 2031 2032 xs_set_memalloc(xprt); 2033 2034 write_unlock_bh(&sk->sk_callback_lock); 2035 } 2036 xs_udp_do_set_buffer_size(xprt); 2037 } 2038 2039 static void xs_udp_setup_socket(struct work_struct *work) 2040 { 2041 struct sock_xprt *transport = 2042 container_of(work, struct sock_xprt, connect_worker.work); 2043 struct rpc_xprt *xprt = &transport->xprt; 2044 struct socket *sock = transport->sock; 2045 int status = -EIO; 2046 2047 /* Start by resetting any existing state */ 2048 xs_reset_transport(transport); 2049 sock = xs_create_sock(xprt, transport, 2050 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); 2051 if (IS_ERR(sock)) 2052 goto out; 2053 2054 dprintk("RPC: worker connecting xprt %p via %s to " 2055 "%s (port %s)\n", xprt, 2056 xprt->address_strings[RPC_DISPLAY_PROTO], 2057 xprt->address_strings[RPC_DISPLAY_ADDR], 2058 xprt->address_strings[RPC_DISPLAY_PORT]); 2059 2060 xs_udp_finish_connecting(xprt, sock); 2061 trace_rpc_socket_connect(xprt, sock, 0); 2062 status = 0; 2063 out: 2064 xprt_clear_connecting(xprt); 2065 xprt_wake_pending_tasks(xprt, status); 2066 } 2067 2068 /* 2069 * We need to preserve the port number so the reply cache on the server can 2070 * find our cached RPC replies when we get around to reconnecting. 2071 */ 2072 static void xs_abort_connection(struct sock_xprt *transport) 2073 { 2074 int result; 2075 struct sockaddr any; 2076 2077 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); 2078 2079 /* 2080 * Disconnect the transport socket by doing a connect operation 2081 * with AF_UNSPEC. This should return immediately... 2082 */ 2083 memset(&any, 0, sizeof(any)); 2084 any.sa_family = AF_UNSPEC; 2085 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 2086 trace_rpc_socket_reset_connection(&transport->xprt, 2087 transport->sock, result); 2088 if (!result) 2089 xs_sock_reset_connection_flags(&transport->xprt); 2090 dprintk("RPC: AF_UNSPEC connect return code %d\n", result); 2091 } 2092 2093 static void xs_tcp_reuse_connection(struct sock_xprt *transport) 2094 { 2095 unsigned int state = transport->inet->sk_state; 2096 2097 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 2098 /* we don't need to abort the connection if the socket 2099 * hasn't undergone a shutdown 2100 */ 2101 if (transport->inet->sk_shutdown == 0) 2102 return; 2103 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 2104 __func__, transport->inet->sk_shutdown); 2105 } 2106 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 2107 /* we don't need to abort the connection if the socket 2108 * hasn't undergone a shutdown 2109 */ 2110 if (transport->inet->sk_shutdown == 0) 2111 return; 2112 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 2113 "sk_shutdown set to %d\n", 2114 __func__, transport->inet->sk_shutdown); 2115 } 2116 xs_abort_connection(transport); 2117 } 2118 2119 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2120 { 2121 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2122 int ret = -ENOTCONN; 2123 2124 if (!transport->inet) { 2125 struct sock *sk = sock->sk; 2126 unsigned int keepidle = xprt->timeout->to_initval / HZ; 2127 unsigned int keepcnt = xprt->timeout->to_retries + 1; 2128 unsigned int opt_on = 1; 2129 2130 /* TCP Keepalive options */ 2131 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2132 (char *)&opt_on, sizeof(opt_on)); 2133 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2134 (char *)&keepidle, sizeof(keepidle)); 2135 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2136 (char *)&keepidle, sizeof(keepidle)); 2137 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2138 (char *)&keepcnt, sizeof(keepcnt)); 2139 2140 write_lock_bh(&sk->sk_callback_lock); 2141 2142 xs_save_old_callbacks(transport, sk); 2143 2144 sk->sk_user_data = xprt; 2145 sk->sk_data_ready = xs_tcp_data_ready; 2146 sk->sk_state_change = xs_tcp_state_change; 2147 sk->sk_write_space = xs_tcp_write_space; 2148 sk->sk_error_report = xs_error_report; 2149 sk->sk_allocation = GFP_ATOMIC; 2150 2151 /* socket options */ 2152 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 2153 sock_reset_flag(sk, SOCK_LINGER); 2154 tcp_sk(sk)->linger2 = 0; 2155 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2156 2157 xprt_clear_connected(xprt); 2158 2159 /* Reset to new socket */ 2160 transport->sock = sock; 2161 transport->inet = sk; 2162 2163 write_unlock_bh(&sk->sk_callback_lock); 2164 } 2165 2166 if (!xprt_bound(xprt)) 2167 goto out; 2168 2169 xs_set_memalloc(xprt); 2170 2171 /* Tell the socket layer to start connecting... */ 2172 xprt->stat.connect_count++; 2173 xprt->stat.connect_start = jiffies; 2174 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2175 switch (ret) { 2176 case 0: 2177 case -EINPROGRESS: 2178 /* SYN_SENT! */ 2179 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2180 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2181 } 2182 out: 2183 return ret; 2184 } 2185 2186 /** 2187 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2188 * @xprt: RPC transport to connect 2189 * @transport: socket transport to connect 2190 * @create_sock: function to create a socket of the correct type 2191 * 2192 * Invoked by a work queue tasklet. 2193 */ 2194 static void xs_tcp_setup_socket(struct work_struct *work) 2195 { 2196 struct sock_xprt *transport = 2197 container_of(work, struct sock_xprt, connect_worker.work); 2198 struct socket *sock = transport->sock; 2199 struct rpc_xprt *xprt = &transport->xprt; 2200 int status = -EIO; 2201 2202 if (!sock) { 2203 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 2204 sock = xs_create_sock(xprt, transport, 2205 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); 2206 if (IS_ERR(sock)) { 2207 status = PTR_ERR(sock); 2208 goto out; 2209 } 2210 } else { 2211 int abort_and_exit; 2212 2213 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 2214 &xprt->state); 2215 /* "close" the socket, preserving the local port */ 2216 set_bit(XPRT_CONNECTION_REUSE, &xprt->state); 2217 xs_tcp_reuse_connection(transport); 2218 clear_bit(XPRT_CONNECTION_REUSE, &xprt->state); 2219 2220 if (abort_and_exit) 2221 goto out_eagain; 2222 } 2223 2224 dprintk("RPC: worker connecting xprt %p via %s to " 2225 "%s (port %s)\n", xprt, 2226 xprt->address_strings[RPC_DISPLAY_PROTO], 2227 xprt->address_strings[RPC_DISPLAY_ADDR], 2228 xprt->address_strings[RPC_DISPLAY_PORT]); 2229 2230 status = xs_tcp_finish_connecting(xprt, sock); 2231 trace_rpc_socket_connect(xprt, sock, status); 2232 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2233 xprt, -status, xprt_connected(xprt), 2234 sock->sk->sk_state); 2235 switch (status) { 2236 default: 2237 printk("%s: connect returned unhandled error %d\n", 2238 __func__, status); 2239 case -EADDRNOTAVAIL: 2240 /* We're probably in TIME_WAIT. Get rid of existing socket, 2241 * and retry 2242 */ 2243 xs_tcp_force_close(xprt); 2244 break; 2245 case 0: 2246 case -EINPROGRESS: 2247 case -EALREADY: 2248 xprt_clear_connecting(xprt); 2249 return; 2250 case -EINVAL: 2251 /* Happens, for instance, if the user specified a link 2252 * local IPv6 address without a scope-id. 2253 */ 2254 case -ECONNREFUSED: 2255 case -ECONNRESET: 2256 case -ENETUNREACH: 2257 case -ENOBUFS: 2258 /* retry with existing socket, after a delay */ 2259 goto out; 2260 } 2261 out_eagain: 2262 status = -EAGAIN; 2263 out: 2264 xprt_clear_connecting(xprt); 2265 xprt_wake_pending_tasks(xprt, status); 2266 } 2267 2268 /** 2269 * xs_connect - connect a socket to a remote endpoint 2270 * @xprt: pointer to transport structure 2271 * @task: address of RPC task that manages state of connect request 2272 * 2273 * TCP: If the remote end dropped the connection, delay reconnecting. 2274 * 2275 * UDP socket connects are synchronous, but we use a work queue anyway 2276 * to guarantee that even unprivileged user processes can set up a 2277 * socket on a privileged port. 2278 * 2279 * If a UDP socket connect fails, the delay behavior here prevents 2280 * retry floods (hard mounts). 2281 */ 2282 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2283 { 2284 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2285 2286 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2287 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2288 "seconds\n", 2289 xprt, xprt->reestablish_timeout / HZ); 2290 queue_delayed_work(rpciod_workqueue, 2291 &transport->connect_worker, 2292 xprt->reestablish_timeout); 2293 xprt->reestablish_timeout <<= 1; 2294 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2295 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2296 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2297 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2298 } else { 2299 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2300 queue_delayed_work(rpciod_workqueue, 2301 &transport->connect_worker, 0); 2302 } 2303 } 2304 2305 /** 2306 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2307 * @xprt: rpc_xprt struct containing statistics 2308 * @seq: output file 2309 * 2310 */ 2311 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2312 { 2313 long idle_time = 0; 2314 2315 if (xprt_connected(xprt)) 2316 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2317 2318 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2319 "%llu %llu %lu %llu %llu\n", 2320 xprt->stat.bind_count, 2321 xprt->stat.connect_count, 2322 xprt->stat.connect_time, 2323 idle_time, 2324 xprt->stat.sends, 2325 xprt->stat.recvs, 2326 xprt->stat.bad_xids, 2327 xprt->stat.req_u, 2328 xprt->stat.bklog_u, 2329 xprt->stat.max_slots, 2330 xprt->stat.sending_u, 2331 xprt->stat.pending_u); 2332 } 2333 2334 /** 2335 * xs_udp_print_stats - display UDP socket-specifc stats 2336 * @xprt: rpc_xprt struct containing statistics 2337 * @seq: output file 2338 * 2339 */ 2340 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2341 { 2342 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2343 2344 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2345 "%lu %llu %llu\n", 2346 transport->srcport, 2347 xprt->stat.bind_count, 2348 xprt->stat.sends, 2349 xprt->stat.recvs, 2350 xprt->stat.bad_xids, 2351 xprt->stat.req_u, 2352 xprt->stat.bklog_u, 2353 xprt->stat.max_slots, 2354 xprt->stat.sending_u, 2355 xprt->stat.pending_u); 2356 } 2357 2358 /** 2359 * xs_tcp_print_stats - display TCP socket-specifc stats 2360 * @xprt: rpc_xprt struct containing statistics 2361 * @seq: output file 2362 * 2363 */ 2364 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2365 { 2366 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2367 long idle_time = 0; 2368 2369 if (xprt_connected(xprt)) 2370 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2371 2372 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2373 "%llu %llu %lu %llu %llu\n", 2374 transport->srcport, 2375 xprt->stat.bind_count, 2376 xprt->stat.connect_count, 2377 xprt->stat.connect_time, 2378 idle_time, 2379 xprt->stat.sends, 2380 xprt->stat.recvs, 2381 xprt->stat.bad_xids, 2382 xprt->stat.req_u, 2383 xprt->stat.bklog_u, 2384 xprt->stat.max_slots, 2385 xprt->stat.sending_u, 2386 xprt->stat.pending_u); 2387 } 2388 2389 /* 2390 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2391 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2392 * to use the server side send routines. 2393 */ 2394 static void *bc_malloc(struct rpc_task *task, size_t size) 2395 { 2396 struct page *page; 2397 struct rpc_buffer *buf; 2398 2399 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2400 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) 2401 return NULL; 2402 2403 page = alloc_page(GFP_KERNEL); 2404 if (!page) 2405 return NULL; 2406 2407 buf = page_address(page); 2408 buf->len = PAGE_SIZE; 2409 2410 return buf->data; 2411 } 2412 2413 /* 2414 * Free the space allocated in the bc_alloc routine 2415 */ 2416 static void bc_free(void *buffer) 2417 { 2418 struct rpc_buffer *buf; 2419 2420 if (!buffer) 2421 return; 2422 2423 buf = container_of(buffer, struct rpc_buffer, data); 2424 free_page((unsigned long)buf); 2425 } 2426 2427 /* 2428 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2429 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2430 */ 2431 static int bc_sendto(struct rpc_rqst *req) 2432 { 2433 int len; 2434 struct xdr_buf *xbufp = &req->rq_snd_buf; 2435 struct rpc_xprt *xprt = req->rq_xprt; 2436 struct sock_xprt *transport = 2437 container_of(xprt, struct sock_xprt, xprt); 2438 struct socket *sock = transport->sock; 2439 unsigned long headoff; 2440 unsigned long tailoff; 2441 2442 xs_encode_stream_record_marker(xbufp); 2443 2444 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2445 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2446 len = svc_send_common(sock, xbufp, 2447 virt_to_page(xbufp->head[0].iov_base), headoff, 2448 xbufp->tail[0].iov_base, tailoff); 2449 2450 if (len != xbufp->len) { 2451 printk(KERN_NOTICE "Error sending entire callback!\n"); 2452 len = -EAGAIN; 2453 } 2454 2455 return len; 2456 } 2457 2458 /* 2459 * The send routine. Borrows from svc_send 2460 */ 2461 static int bc_send_request(struct rpc_task *task) 2462 { 2463 struct rpc_rqst *req = task->tk_rqstp; 2464 struct svc_xprt *xprt; 2465 u32 len; 2466 2467 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2468 /* 2469 * Get the server socket associated with this callback xprt 2470 */ 2471 xprt = req->rq_xprt->bc_xprt; 2472 2473 /* 2474 * Grab the mutex to serialize data as the connection is shared 2475 * with the fore channel 2476 */ 2477 if (!mutex_trylock(&xprt->xpt_mutex)) { 2478 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2479 if (!mutex_trylock(&xprt->xpt_mutex)) 2480 return -EAGAIN; 2481 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2482 } 2483 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2484 len = -ENOTCONN; 2485 else 2486 len = bc_sendto(req); 2487 mutex_unlock(&xprt->xpt_mutex); 2488 2489 if (len > 0) 2490 len = 0; 2491 2492 return len; 2493 } 2494 2495 /* 2496 * The close routine. Since this is client initiated, we do nothing 2497 */ 2498 2499 static void bc_close(struct rpc_xprt *xprt) 2500 { 2501 } 2502 2503 /* 2504 * The xprt destroy routine. Again, because this connection is client 2505 * initiated, we do nothing 2506 */ 2507 2508 static void bc_destroy(struct rpc_xprt *xprt) 2509 { 2510 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2511 2512 xs_xprt_free(xprt); 2513 module_put(THIS_MODULE); 2514 } 2515 2516 static struct rpc_xprt_ops xs_local_ops = { 2517 .reserve_xprt = xprt_reserve_xprt, 2518 .release_xprt = xs_tcp_release_xprt, 2519 .alloc_slot = xprt_alloc_slot, 2520 .rpcbind = xs_local_rpcbind, 2521 .set_port = xs_local_set_port, 2522 .connect = xs_local_connect, 2523 .buf_alloc = rpc_malloc, 2524 .buf_free = rpc_free, 2525 .send_request = xs_local_send_request, 2526 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2527 .close = xs_close, 2528 .destroy = xs_destroy, 2529 .print_stats = xs_local_print_stats, 2530 }; 2531 2532 static struct rpc_xprt_ops xs_udp_ops = { 2533 .set_buffer_size = xs_udp_set_buffer_size, 2534 .reserve_xprt = xprt_reserve_xprt_cong, 2535 .release_xprt = xprt_release_xprt_cong, 2536 .alloc_slot = xprt_alloc_slot, 2537 .rpcbind = rpcb_getport_async, 2538 .set_port = xs_set_port, 2539 .connect = xs_connect, 2540 .buf_alloc = rpc_malloc, 2541 .buf_free = rpc_free, 2542 .send_request = xs_udp_send_request, 2543 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2544 .timer = xs_udp_timer, 2545 .release_request = xprt_release_rqst_cong, 2546 .close = xs_close, 2547 .destroy = xs_destroy, 2548 .print_stats = xs_udp_print_stats, 2549 }; 2550 2551 static struct rpc_xprt_ops xs_tcp_ops = { 2552 .reserve_xprt = xprt_reserve_xprt, 2553 .release_xprt = xs_tcp_release_xprt, 2554 .alloc_slot = xprt_lock_and_alloc_slot, 2555 .rpcbind = rpcb_getport_async, 2556 .set_port = xs_set_port, 2557 .connect = xs_connect, 2558 .buf_alloc = rpc_malloc, 2559 .buf_free = rpc_free, 2560 .send_request = xs_tcp_send_request, 2561 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2562 .close = xs_tcp_close, 2563 .destroy = xs_destroy, 2564 .print_stats = xs_tcp_print_stats, 2565 }; 2566 2567 /* 2568 * The rpc_xprt_ops for the server backchannel 2569 */ 2570 2571 static struct rpc_xprt_ops bc_tcp_ops = { 2572 .reserve_xprt = xprt_reserve_xprt, 2573 .release_xprt = xprt_release_xprt, 2574 .alloc_slot = xprt_alloc_slot, 2575 .buf_alloc = bc_malloc, 2576 .buf_free = bc_free, 2577 .send_request = bc_send_request, 2578 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2579 .close = bc_close, 2580 .destroy = bc_destroy, 2581 .print_stats = xs_tcp_print_stats, 2582 }; 2583 2584 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2585 { 2586 static const struct sockaddr_in sin = { 2587 .sin_family = AF_INET, 2588 .sin_addr.s_addr = htonl(INADDR_ANY), 2589 }; 2590 static const struct sockaddr_in6 sin6 = { 2591 .sin6_family = AF_INET6, 2592 .sin6_addr = IN6ADDR_ANY_INIT, 2593 }; 2594 2595 switch (family) { 2596 case AF_LOCAL: 2597 break; 2598 case AF_INET: 2599 memcpy(sap, &sin, sizeof(sin)); 2600 break; 2601 case AF_INET6: 2602 memcpy(sap, &sin6, sizeof(sin6)); 2603 break; 2604 default: 2605 dprintk("RPC: %s: Bad address family\n", __func__); 2606 return -EAFNOSUPPORT; 2607 } 2608 return 0; 2609 } 2610 2611 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2612 unsigned int slot_table_size, 2613 unsigned int max_slot_table_size) 2614 { 2615 struct rpc_xprt *xprt; 2616 struct sock_xprt *new; 2617 2618 if (args->addrlen > sizeof(xprt->addr)) { 2619 dprintk("RPC: xs_setup_xprt: address too large\n"); 2620 return ERR_PTR(-EBADF); 2621 } 2622 2623 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2624 max_slot_table_size); 2625 if (xprt == NULL) { 2626 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2627 "rpc_xprt\n"); 2628 return ERR_PTR(-ENOMEM); 2629 } 2630 2631 new = container_of(xprt, struct sock_xprt, xprt); 2632 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2633 xprt->addrlen = args->addrlen; 2634 if (args->srcaddr) 2635 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2636 else { 2637 int err; 2638 err = xs_init_anyaddr(args->dstaddr->sa_family, 2639 (struct sockaddr *)&new->srcaddr); 2640 if (err != 0) { 2641 xprt_free(xprt); 2642 return ERR_PTR(err); 2643 } 2644 } 2645 2646 return xprt; 2647 } 2648 2649 static const struct rpc_timeout xs_local_default_timeout = { 2650 .to_initval = 10 * HZ, 2651 .to_maxval = 10 * HZ, 2652 .to_retries = 2, 2653 }; 2654 2655 /** 2656 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2657 * @args: rpc transport creation arguments 2658 * 2659 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2660 */ 2661 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2662 { 2663 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2664 struct sock_xprt *transport; 2665 struct rpc_xprt *xprt; 2666 struct rpc_xprt *ret; 2667 2668 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2669 xprt_max_tcp_slot_table_entries); 2670 if (IS_ERR(xprt)) 2671 return xprt; 2672 transport = container_of(xprt, struct sock_xprt, xprt); 2673 2674 xprt->prot = 0; 2675 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2676 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2677 2678 xprt->bind_timeout = XS_BIND_TO; 2679 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2680 xprt->idle_timeout = XS_IDLE_DISC_TO; 2681 2682 xprt->ops = &xs_local_ops; 2683 xprt->timeout = &xs_local_default_timeout; 2684 2685 INIT_DELAYED_WORK(&transport->connect_worker, 2686 xs_dummy_setup_socket); 2687 2688 switch (sun->sun_family) { 2689 case AF_LOCAL: 2690 if (sun->sun_path[0] != '/') { 2691 dprintk("RPC: bad AF_LOCAL address: %s\n", 2692 sun->sun_path); 2693 ret = ERR_PTR(-EINVAL); 2694 goto out_err; 2695 } 2696 xprt_set_bound(xprt); 2697 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2698 ret = ERR_PTR(xs_local_setup_socket(transport)); 2699 if (ret) 2700 goto out_err; 2701 break; 2702 default: 2703 ret = ERR_PTR(-EAFNOSUPPORT); 2704 goto out_err; 2705 } 2706 2707 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2708 xprt->address_strings[RPC_DISPLAY_ADDR]); 2709 2710 if (try_module_get(THIS_MODULE)) 2711 return xprt; 2712 ret = ERR_PTR(-EINVAL); 2713 out_err: 2714 xs_xprt_free(xprt); 2715 return ret; 2716 } 2717 2718 static const struct rpc_timeout xs_udp_default_timeout = { 2719 .to_initval = 5 * HZ, 2720 .to_maxval = 30 * HZ, 2721 .to_increment = 5 * HZ, 2722 .to_retries = 5, 2723 }; 2724 2725 /** 2726 * xs_setup_udp - Set up transport to use a UDP socket 2727 * @args: rpc transport creation arguments 2728 * 2729 */ 2730 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2731 { 2732 struct sockaddr *addr = args->dstaddr; 2733 struct rpc_xprt *xprt; 2734 struct sock_xprt *transport; 2735 struct rpc_xprt *ret; 2736 2737 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2738 xprt_udp_slot_table_entries); 2739 if (IS_ERR(xprt)) 2740 return xprt; 2741 transport = container_of(xprt, struct sock_xprt, xprt); 2742 2743 xprt->prot = IPPROTO_UDP; 2744 xprt->tsh_size = 0; 2745 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2746 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2747 2748 xprt->bind_timeout = XS_BIND_TO; 2749 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2750 xprt->idle_timeout = XS_IDLE_DISC_TO; 2751 2752 xprt->ops = &xs_udp_ops; 2753 2754 xprt->timeout = &xs_udp_default_timeout; 2755 2756 switch (addr->sa_family) { 2757 case AF_INET: 2758 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2759 xprt_set_bound(xprt); 2760 2761 INIT_DELAYED_WORK(&transport->connect_worker, 2762 xs_udp_setup_socket); 2763 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2764 break; 2765 case AF_INET6: 2766 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2767 xprt_set_bound(xprt); 2768 2769 INIT_DELAYED_WORK(&transport->connect_worker, 2770 xs_udp_setup_socket); 2771 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2772 break; 2773 default: 2774 ret = ERR_PTR(-EAFNOSUPPORT); 2775 goto out_err; 2776 } 2777 2778 if (xprt_bound(xprt)) 2779 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2780 xprt->address_strings[RPC_DISPLAY_ADDR], 2781 xprt->address_strings[RPC_DISPLAY_PORT], 2782 xprt->address_strings[RPC_DISPLAY_PROTO]); 2783 else 2784 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2785 xprt->address_strings[RPC_DISPLAY_ADDR], 2786 xprt->address_strings[RPC_DISPLAY_PROTO]); 2787 2788 if (try_module_get(THIS_MODULE)) 2789 return xprt; 2790 ret = ERR_PTR(-EINVAL); 2791 out_err: 2792 xs_xprt_free(xprt); 2793 return ret; 2794 } 2795 2796 static const struct rpc_timeout xs_tcp_default_timeout = { 2797 .to_initval = 60 * HZ, 2798 .to_maxval = 60 * HZ, 2799 .to_retries = 2, 2800 }; 2801 2802 /** 2803 * xs_setup_tcp - Set up transport to use a TCP socket 2804 * @args: rpc transport creation arguments 2805 * 2806 */ 2807 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2808 { 2809 struct sockaddr *addr = args->dstaddr; 2810 struct rpc_xprt *xprt; 2811 struct sock_xprt *transport; 2812 struct rpc_xprt *ret; 2813 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2814 2815 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2816 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2817 2818 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2819 max_slot_table_size); 2820 if (IS_ERR(xprt)) 2821 return xprt; 2822 transport = container_of(xprt, struct sock_xprt, xprt); 2823 2824 xprt->prot = IPPROTO_TCP; 2825 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2826 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2827 2828 xprt->bind_timeout = XS_BIND_TO; 2829 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2830 xprt->idle_timeout = XS_IDLE_DISC_TO; 2831 2832 xprt->ops = &xs_tcp_ops; 2833 xprt->timeout = &xs_tcp_default_timeout; 2834 2835 switch (addr->sa_family) { 2836 case AF_INET: 2837 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2838 xprt_set_bound(xprt); 2839 2840 INIT_DELAYED_WORK(&transport->connect_worker, 2841 xs_tcp_setup_socket); 2842 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2843 break; 2844 case AF_INET6: 2845 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2846 xprt_set_bound(xprt); 2847 2848 INIT_DELAYED_WORK(&transport->connect_worker, 2849 xs_tcp_setup_socket); 2850 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2851 break; 2852 default: 2853 ret = ERR_PTR(-EAFNOSUPPORT); 2854 goto out_err; 2855 } 2856 2857 if (xprt_bound(xprt)) 2858 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2859 xprt->address_strings[RPC_DISPLAY_ADDR], 2860 xprt->address_strings[RPC_DISPLAY_PORT], 2861 xprt->address_strings[RPC_DISPLAY_PROTO]); 2862 else 2863 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2864 xprt->address_strings[RPC_DISPLAY_ADDR], 2865 xprt->address_strings[RPC_DISPLAY_PROTO]); 2866 2867 if (try_module_get(THIS_MODULE)) 2868 return xprt; 2869 ret = ERR_PTR(-EINVAL); 2870 out_err: 2871 xs_xprt_free(xprt); 2872 return ret; 2873 } 2874 2875 /** 2876 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2877 * @args: rpc transport creation arguments 2878 * 2879 */ 2880 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2881 { 2882 struct sockaddr *addr = args->dstaddr; 2883 struct rpc_xprt *xprt; 2884 struct sock_xprt *transport; 2885 struct svc_sock *bc_sock; 2886 struct rpc_xprt *ret; 2887 2888 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2889 xprt_tcp_slot_table_entries); 2890 if (IS_ERR(xprt)) 2891 return xprt; 2892 transport = container_of(xprt, struct sock_xprt, xprt); 2893 2894 xprt->prot = IPPROTO_TCP; 2895 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2896 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2897 xprt->timeout = &xs_tcp_default_timeout; 2898 2899 /* backchannel */ 2900 xprt_set_bound(xprt); 2901 xprt->bind_timeout = 0; 2902 xprt->reestablish_timeout = 0; 2903 xprt->idle_timeout = 0; 2904 2905 xprt->ops = &bc_tcp_ops; 2906 2907 switch (addr->sa_family) { 2908 case AF_INET: 2909 xs_format_peer_addresses(xprt, "tcp", 2910 RPCBIND_NETID_TCP); 2911 break; 2912 case AF_INET6: 2913 xs_format_peer_addresses(xprt, "tcp", 2914 RPCBIND_NETID_TCP6); 2915 break; 2916 default: 2917 ret = ERR_PTR(-EAFNOSUPPORT); 2918 goto out_err; 2919 } 2920 2921 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2922 xprt->address_strings[RPC_DISPLAY_ADDR], 2923 xprt->address_strings[RPC_DISPLAY_PORT], 2924 xprt->address_strings[RPC_DISPLAY_PROTO]); 2925 2926 /* 2927 * Once we've associated a backchannel xprt with a connection, 2928 * we want to keep it around as long as the connection lasts, 2929 * in case we need to start using it for a backchannel again; 2930 * this reference won't be dropped until bc_xprt is destroyed. 2931 */ 2932 xprt_get(xprt); 2933 args->bc_xprt->xpt_bc_xprt = xprt; 2934 xprt->bc_xprt = args->bc_xprt; 2935 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2936 transport->sock = bc_sock->sk_sock; 2937 transport->inet = bc_sock->sk_sk; 2938 2939 /* 2940 * Since we don't want connections for the backchannel, we set 2941 * the xprt status to connected 2942 */ 2943 xprt_set_connected(xprt); 2944 2945 if (try_module_get(THIS_MODULE)) 2946 return xprt; 2947 2948 args->bc_xprt->xpt_bc_xprt = NULL; 2949 xprt_put(xprt); 2950 ret = ERR_PTR(-EINVAL); 2951 out_err: 2952 xs_xprt_free(xprt); 2953 return ret; 2954 } 2955 2956 static struct xprt_class xs_local_transport = { 2957 .list = LIST_HEAD_INIT(xs_local_transport.list), 2958 .name = "named UNIX socket", 2959 .owner = THIS_MODULE, 2960 .ident = XPRT_TRANSPORT_LOCAL, 2961 .setup = xs_setup_local, 2962 }; 2963 2964 static struct xprt_class xs_udp_transport = { 2965 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2966 .name = "udp", 2967 .owner = THIS_MODULE, 2968 .ident = XPRT_TRANSPORT_UDP, 2969 .setup = xs_setup_udp, 2970 }; 2971 2972 static struct xprt_class xs_tcp_transport = { 2973 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2974 .name = "tcp", 2975 .owner = THIS_MODULE, 2976 .ident = XPRT_TRANSPORT_TCP, 2977 .setup = xs_setup_tcp, 2978 }; 2979 2980 static struct xprt_class xs_bc_tcp_transport = { 2981 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2982 .name = "tcp NFSv4.1 backchannel", 2983 .owner = THIS_MODULE, 2984 .ident = XPRT_TRANSPORT_BC_TCP, 2985 .setup = xs_setup_bc_tcp, 2986 }; 2987 2988 /** 2989 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2990 * 2991 */ 2992 int init_socket_xprt(void) 2993 { 2994 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 2995 if (!sunrpc_table_header) 2996 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2997 #endif 2998 2999 xprt_register_transport(&xs_local_transport); 3000 xprt_register_transport(&xs_udp_transport); 3001 xprt_register_transport(&xs_tcp_transport); 3002 xprt_register_transport(&xs_bc_tcp_transport); 3003 3004 return 0; 3005 } 3006 3007 /** 3008 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3009 * 3010 */ 3011 void cleanup_socket_xprt(void) 3012 { 3013 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3014 if (sunrpc_table_header) { 3015 unregister_sysctl_table(sunrpc_table_header); 3016 sunrpc_table_header = NULL; 3017 } 3018 #endif 3019 3020 xprt_unregister_transport(&xs_local_transport); 3021 xprt_unregister_transport(&xs_udp_transport); 3022 xprt_unregister_transport(&xs_tcp_transport); 3023 xprt_unregister_transport(&xs_bc_tcp_transport); 3024 } 3025 3026 static int param_set_uint_minmax(const char *val, 3027 const struct kernel_param *kp, 3028 unsigned int min, unsigned int max) 3029 { 3030 unsigned int num; 3031 int ret; 3032 3033 if (!val) 3034 return -EINVAL; 3035 ret = kstrtouint(val, 0, &num); 3036 if (ret == -EINVAL || num < min || num > max) 3037 return -EINVAL; 3038 *((unsigned int *)kp->arg) = num; 3039 return 0; 3040 } 3041 3042 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3043 { 3044 return param_set_uint_minmax(val, kp, 3045 RPC_MIN_RESVPORT, 3046 RPC_MAX_RESVPORT); 3047 } 3048 3049 static struct kernel_param_ops param_ops_portnr = { 3050 .set = param_set_portnr, 3051 .get = param_get_uint, 3052 }; 3053 3054 #define param_check_portnr(name, p) \ 3055 __param_check(name, p, unsigned int); 3056 3057 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3058 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3059 3060 static int param_set_slot_table_size(const char *val, 3061 const struct kernel_param *kp) 3062 { 3063 return param_set_uint_minmax(val, kp, 3064 RPC_MIN_SLOT_TABLE, 3065 RPC_MAX_SLOT_TABLE); 3066 } 3067 3068 static struct kernel_param_ops param_ops_slot_table_size = { 3069 .set = param_set_slot_table_size, 3070 .get = param_get_uint, 3071 }; 3072 3073 #define param_check_slot_table_size(name, p) \ 3074 __param_check(name, p, unsigned int); 3075 3076 static int param_set_max_slot_table_size(const char *val, 3077 const struct kernel_param *kp) 3078 { 3079 return param_set_uint_minmax(val, kp, 3080 RPC_MIN_SLOT_TABLE, 3081 RPC_MAX_SLOT_TABLE_LIMIT); 3082 } 3083 3084 static struct kernel_param_ops param_ops_max_slot_table_size = { 3085 .set = param_set_max_slot_table_size, 3086 .get = param_get_uint, 3087 }; 3088 3089 #define param_check_max_slot_table_size(name, p) \ 3090 __param_check(name, p, unsigned int); 3091 3092 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3093 slot_table_size, 0644); 3094 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3095 max_slot_table_size, 0644); 3096 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3097 slot_table_size, 0644); 3098 3099