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 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 56 struct socket *sock); 57 58 /* 59 * xprtsock tunables 60 */ 61 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 62 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 63 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 64 65 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 66 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 67 68 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 69 70 #define XS_TCP_LINGER_TO (15U * HZ) 71 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 72 73 /* 74 * We can register our own files under /proc/sys/sunrpc by 75 * calling register_sysctl_table() again. The files in that 76 * directory become the union of all files registered there. 77 * 78 * We simply need to make sure that we don't collide with 79 * someone else's file names! 80 */ 81 82 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 83 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 84 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 85 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 86 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 87 88 static struct ctl_table_header *sunrpc_table_header; 89 90 /* 91 * FIXME: changing the UDP slot table size should also resize the UDP 92 * socket buffers for existing UDP transports 93 */ 94 static struct ctl_table xs_tunables_table[] = { 95 { 96 .procname = "udp_slot_table_entries", 97 .data = &xprt_udp_slot_table_entries, 98 .maxlen = sizeof(unsigned int), 99 .mode = 0644, 100 .proc_handler = proc_dointvec_minmax, 101 .extra1 = &min_slot_table_size, 102 .extra2 = &max_slot_table_size 103 }, 104 { 105 .procname = "tcp_slot_table_entries", 106 .data = &xprt_tcp_slot_table_entries, 107 .maxlen = sizeof(unsigned int), 108 .mode = 0644, 109 .proc_handler = proc_dointvec_minmax, 110 .extra1 = &min_slot_table_size, 111 .extra2 = &max_slot_table_size 112 }, 113 { 114 .procname = "tcp_max_slot_table_entries", 115 .data = &xprt_max_tcp_slot_table_entries, 116 .maxlen = sizeof(unsigned int), 117 .mode = 0644, 118 .proc_handler = proc_dointvec_minmax, 119 .extra1 = &min_slot_table_size, 120 .extra2 = &max_tcp_slot_table_limit 121 }, 122 { 123 .procname = "min_resvport", 124 .data = &xprt_min_resvport, 125 .maxlen = sizeof(unsigned int), 126 .mode = 0644, 127 .proc_handler = proc_dointvec_minmax, 128 .extra1 = &xprt_min_resvport_limit, 129 .extra2 = &xprt_max_resvport 130 }, 131 { 132 .procname = "max_resvport", 133 .data = &xprt_max_resvport, 134 .maxlen = sizeof(unsigned int), 135 .mode = 0644, 136 .proc_handler = proc_dointvec_minmax, 137 .extra1 = &xprt_min_resvport, 138 .extra2 = &xprt_max_resvport_limit 139 }, 140 { 141 .procname = "tcp_fin_timeout", 142 .data = &xs_tcp_fin_timeout, 143 .maxlen = sizeof(xs_tcp_fin_timeout), 144 .mode = 0644, 145 .proc_handler = proc_dointvec_jiffies, 146 }, 147 { }, 148 }; 149 150 static struct ctl_table sunrpc_table[] = { 151 { 152 .procname = "sunrpc", 153 .mode = 0555, 154 .child = xs_tunables_table 155 }, 156 { }, 157 }; 158 159 #endif 160 161 /* 162 * Wait duration for a reply from the RPC portmapper. 163 */ 164 #define XS_BIND_TO (60U * HZ) 165 166 /* 167 * Delay if a UDP socket connect error occurs. This is most likely some 168 * kind of resource problem on the local host. 169 */ 170 #define XS_UDP_REEST_TO (2U * HZ) 171 172 /* 173 * The reestablish timeout allows clients to delay for a bit before attempting 174 * to reconnect to a server that just dropped our connection. 175 * 176 * We implement an exponential backoff when trying to reestablish a TCP 177 * transport connection with the server. Some servers like to drop a TCP 178 * connection when they are overworked, so we start with a short timeout and 179 * increase over time if the server is down or not responding. 180 */ 181 #define XS_TCP_INIT_REEST_TO (3U * HZ) 182 183 /* 184 * TCP idle timeout; client drops the transport socket if it is idle 185 * for this long. Note that we also timeout UDP sockets to prevent 186 * holding port numbers when there is no RPC traffic. 187 */ 188 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 189 190 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 191 # undef RPC_DEBUG_DATA 192 # define RPCDBG_FACILITY RPCDBG_TRANS 193 #endif 194 195 #ifdef RPC_DEBUG_DATA 196 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 197 { 198 u8 *buf = (u8 *) packet; 199 int j; 200 201 dprintk("RPC: %s\n", msg); 202 for (j = 0; j < count && j < 128; j += 4) { 203 if (!(j & 31)) { 204 if (j) 205 dprintk("\n"); 206 dprintk("0x%04x ", j); 207 } 208 dprintk("%02x%02x%02x%02x ", 209 buf[j], buf[j+1], buf[j+2], buf[j+3]); 210 } 211 dprintk("\n"); 212 } 213 #else 214 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 215 { 216 /* NOP */ 217 } 218 #endif 219 220 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 221 { 222 return (struct rpc_xprt *) sk->sk_user_data; 223 } 224 225 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 226 { 227 return (struct sockaddr *) &xprt->addr; 228 } 229 230 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 231 { 232 return (struct sockaddr_un *) &xprt->addr; 233 } 234 235 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 236 { 237 return (struct sockaddr_in *) &xprt->addr; 238 } 239 240 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 241 { 242 return (struct sockaddr_in6 *) &xprt->addr; 243 } 244 245 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 246 { 247 struct sockaddr *sap = xs_addr(xprt); 248 struct sockaddr_in6 *sin6; 249 struct sockaddr_in *sin; 250 struct sockaddr_un *sun; 251 char buf[128]; 252 253 switch (sap->sa_family) { 254 case AF_LOCAL: 255 sun = xs_addr_un(xprt); 256 strlcpy(buf, sun->sun_path, sizeof(buf)); 257 xprt->address_strings[RPC_DISPLAY_ADDR] = 258 kstrdup(buf, GFP_KERNEL); 259 break; 260 case AF_INET: 261 (void)rpc_ntop(sap, buf, sizeof(buf)); 262 xprt->address_strings[RPC_DISPLAY_ADDR] = 263 kstrdup(buf, GFP_KERNEL); 264 sin = xs_addr_in(xprt); 265 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 266 break; 267 case AF_INET6: 268 (void)rpc_ntop(sap, buf, sizeof(buf)); 269 xprt->address_strings[RPC_DISPLAY_ADDR] = 270 kstrdup(buf, GFP_KERNEL); 271 sin6 = xs_addr_in6(xprt); 272 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 273 break; 274 default: 275 BUG(); 276 } 277 278 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 279 } 280 281 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 282 { 283 struct sockaddr *sap = xs_addr(xprt); 284 char buf[128]; 285 286 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 287 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 288 289 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 290 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 291 } 292 293 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 294 const char *protocol, 295 const char *netid) 296 { 297 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 298 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 299 xs_format_common_peer_addresses(xprt); 300 xs_format_common_peer_ports(xprt); 301 } 302 303 static void xs_update_peer_port(struct rpc_xprt *xprt) 304 { 305 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 306 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 307 308 xs_format_common_peer_ports(xprt); 309 } 310 311 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 312 { 313 unsigned int i; 314 315 for (i = 0; i < RPC_DISPLAY_MAX; i++) 316 switch (i) { 317 case RPC_DISPLAY_PROTO: 318 case RPC_DISPLAY_NETID: 319 continue; 320 default: 321 kfree(xprt->address_strings[i]); 322 } 323 } 324 325 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 326 327 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 328 { 329 struct msghdr msg = { 330 .msg_name = addr, 331 .msg_namelen = addrlen, 332 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 333 }; 334 struct kvec iov = { 335 .iov_base = vec->iov_base + base, 336 .iov_len = vec->iov_len - base, 337 }; 338 339 if (iov.iov_len != 0) 340 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 341 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 342 } 343 344 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p) 345 { 346 ssize_t (*do_sendpage)(struct socket *sock, struct page *page, 347 int offset, size_t size, int flags); 348 struct page **ppage; 349 unsigned int remainder; 350 int err; 351 352 remainder = xdr->page_len - base; 353 base += xdr->page_base; 354 ppage = xdr->pages + (base >> PAGE_SHIFT); 355 base &= ~PAGE_MASK; 356 do_sendpage = sock->ops->sendpage; 357 if (!zerocopy) 358 do_sendpage = sock_no_sendpage; 359 for(;;) { 360 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 361 int flags = XS_SENDMSG_FLAGS; 362 363 remainder -= len; 364 if (more) 365 flags |= MSG_MORE; 366 if (remainder != 0) 367 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE; 368 err = do_sendpage(sock, *ppage, base, len, flags); 369 if (remainder == 0 || err != len) 370 break; 371 *sent_p += err; 372 ppage++; 373 base = 0; 374 } 375 if (err > 0) { 376 *sent_p += err; 377 err = 0; 378 } 379 return err; 380 } 381 382 /** 383 * xs_sendpages - write pages directly to a socket 384 * @sock: socket to send on 385 * @addr: UDP only -- address of destination 386 * @addrlen: UDP only -- length of destination address 387 * @xdr: buffer containing this request 388 * @base: starting position in the buffer 389 * @zerocopy: true if it is safe to use sendpage() 390 * @sent_p: return the total number of bytes successfully queued for sending 391 * 392 */ 393 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p) 394 { 395 unsigned int remainder = xdr->len - base; 396 int err = 0; 397 int sent = 0; 398 399 if (unlikely(!sock)) 400 return -ENOTSOCK; 401 402 if (base != 0) { 403 addr = NULL; 404 addrlen = 0; 405 } 406 407 if (base < xdr->head[0].iov_len || addr != NULL) { 408 unsigned int len = xdr->head[0].iov_len - base; 409 remainder -= len; 410 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 411 if (remainder == 0 || err != len) 412 goto out; 413 *sent_p += err; 414 base = 0; 415 } else 416 base -= xdr->head[0].iov_len; 417 418 if (base < xdr->page_len) { 419 unsigned int len = xdr->page_len - base; 420 remainder -= len; 421 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent); 422 *sent_p += sent; 423 if (remainder == 0 || sent != len) 424 goto out; 425 base = 0; 426 } else 427 base -= xdr->page_len; 428 429 if (base >= xdr->tail[0].iov_len) 430 return 0; 431 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 432 out: 433 if (err > 0) { 434 *sent_p += err; 435 err = 0; 436 } 437 return err; 438 } 439 440 static void xs_nospace_callback(struct rpc_task *task) 441 { 442 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 443 444 transport->inet->sk_write_pending--; 445 } 446 447 /** 448 * xs_nospace - place task on wait queue if transmit was incomplete 449 * @task: task to put to sleep 450 * 451 */ 452 static int xs_nospace(struct rpc_task *task) 453 { 454 struct rpc_rqst *req = task->tk_rqstp; 455 struct rpc_xprt *xprt = req->rq_xprt; 456 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 457 struct sock *sk = transport->inet; 458 int ret = -EAGAIN; 459 460 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 461 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 462 req->rq_slen); 463 464 /* Protect against races with write_space */ 465 spin_lock_bh(&xprt->transport_lock); 466 467 /* Don't race with disconnect */ 468 if (xprt_connected(xprt)) { 469 /* wait for more buffer space */ 470 sk->sk_write_pending++; 471 xprt_wait_for_buffer_space(task, xs_nospace_callback); 472 } else 473 ret = -ENOTCONN; 474 475 spin_unlock_bh(&xprt->transport_lock); 476 477 /* Race breaker in case memory is freed before above code is called */ 478 if (ret == -EAGAIN) { 479 struct socket_wq *wq; 480 481 rcu_read_lock(); 482 wq = rcu_dereference(sk->sk_wq); 483 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags); 484 rcu_read_unlock(); 485 486 sk->sk_write_space(sk); 487 } 488 return ret; 489 } 490 491 /* 492 * Construct a stream transport record marker in @buf. 493 */ 494 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 495 { 496 u32 reclen = buf->len - sizeof(rpc_fraghdr); 497 rpc_fraghdr *base = buf->head[0].iov_base; 498 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 499 } 500 501 /** 502 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 503 * @task: RPC task that manages the state of an RPC request 504 * 505 * Return values: 506 * 0: The request has been sent 507 * EAGAIN: The socket was blocked, please call again later to 508 * complete the request 509 * ENOTCONN: Caller needs to invoke connect logic then call again 510 * other: Some other error occured, the request was not sent 511 */ 512 static int xs_local_send_request(struct rpc_task *task) 513 { 514 struct rpc_rqst *req = task->tk_rqstp; 515 struct rpc_xprt *xprt = req->rq_xprt; 516 struct sock_xprt *transport = 517 container_of(xprt, struct sock_xprt, xprt); 518 struct xdr_buf *xdr = &req->rq_snd_buf; 519 int status; 520 int sent = 0; 521 522 xs_encode_stream_record_marker(&req->rq_snd_buf); 523 524 xs_pktdump("packet data:", 525 req->rq_svec->iov_base, req->rq_svec->iov_len); 526 527 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent, 528 true, &sent); 529 dprintk("RPC: %s(%u) = %d\n", 530 __func__, xdr->len - req->rq_bytes_sent, status); 531 532 if (status == -EAGAIN && sock_writeable(transport->inet)) 533 status = -ENOBUFS; 534 535 if (likely(sent > 0) || status == 0) { 536 req->rq_bytes_sent += sent; 537 req->rq_xmit_bytes_sent += sent; 538 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 539 req->rq_bytes_sent = 0; 540 return 0; 541 } 542 status = -EAGAIN; 543 } 544 545 switch (status) { 546 case -ENOBUFS: 547 break; 548 case -EAGAIN: 549 status = xs_nospace(task); 550 break; 551 default: 552 dprintk("RPC: sendmsg returned unrecognized error %d\n", 553 -status); 554 case -EPIPE: 555 xs_close(xprt); 556 status = -ENOTCONN; 557 } 558 559 return status; 560 } 561 562 /** 563 * xs_udp_send_request - write an RPC request to a UDP socket 564 * @task: address of RPC task that manages the state of an RPC request 565 * 566 * Return values: 567 * 0: The request has been sent 568 * EAGAIN: The socket was blocked, please call again later to 569 * complete the request 570 * ENOTCONN: Caller needs to invoke connect logic then call again 571 * other: Some other error occurred, the request was not sent 572 */ 573 static int xs_udp_send_request(struct rpc_task *task) 574 { 575 struct rpc_rqst *req = task->tk_rqstp; 576 struct rpc_xprt *xprt = req->rq_xprt; 577 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 578 struct xdr_buf *xdr = &req->rq_snd_buf; 579 int sent = 0; 580 int status; 581 582 xs_pktdump("packet data:", 583 req->rq_svec->iov_base, 584 req->rq_svec->iov_len); 585 586 if (!xprt_bound(xprt)) 587 return -ENOTCONN; 588 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, 589 xdr, req->rq_bytes_sent, true, &sent); 590 591 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 592 xdr->len - req->rq_bytes_sent, status); 593 594 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 595 if (status == -EPERM) 596 goto process_status; 597 598 if (status == -EAGAIN && sock_writeable(transport->inet)) 599 status = -ENOBUFS; 600 601 if (sent > 0 || status == 0) { 602 req->rq_xmit_bytes_sent += sent; 603 if (sent >= req->rq_slen) 604 return 0; 605 /* Still some bytes left; set up for a retry later. */ 606 status = -EAGAIN; 607 } 608 609 process_status: 610 switch (status) { 611 case -ENOTSOCK: 612 status = -ENOTCONN; 613 /* Should we call xs_close() here? */ 614 break; 615 case -EAGAIN: 616 status = xs_nospace(task); 617 break; 618 case -ENETUNREACH: 619 case -ENOBUFS: 620 case -EPIPE: 621 case -ECONNREFUSED: 622 case -EPERM: 623 /* When the server has died, an ICMP port unreachable message 624 * prompts ECONNREFUSED. */ 625 break; 626 default: 627 dprintk("RPC: sendmsg returned unrecognized error %d\n", 628 -status); 629 } 630 631 return status; 632 } 633 634 /** 635 * xs_tcp_send_request - write an RPC request to a TCP socket 636 * @task: address of RPC task that manages the state of an RPC request 637 * 638 * Return values: 639 * 0: The request has been sent 640 * EAGAIN: The socket was blocked, please call again later to 641 * complete the request 642 * ENOTCONN: Caller needs to invoke connect logic then call again 643 * other: Some other error occurred, the request was not sent 644 * 645 * XXX: In the case of soft timeouts, should we eventually give up 646 * if sendmsg is not able to make progress? 647 */ 648 static int xs_tcp_send_request(struct rpc_task *task) 649 { 650 struct rpc_rqst *req = task->tk_rqstp; 651 struct rpc_xprt *xprt = req->rq_xprt; 652 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 653 struct xdr_buf *xdr = &req->rq_snd_buf; 654 bool zerocopy = true; 655 bool vm_wait = false; 656 int status; 657 int sent; 658 659 xs_encode_stream_record_marker(&req->rq_snd_buf); 660 661 xs_pktdump("packet data:", 662 req->rq_svec->iov_base, 663 req->rq_svec->iov_len); 664 /* Don't use zero copy if this is a resend. If the RPC call 665 * completes while the socket holds a reference to the pages, 666 * then we may end up resending corrupted data. 667 */ 668 if (task->tk_flags & RPC_TASK_SENT) 669 zerocopy = false; 670 671 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) 672 xs_tcp_set_socket_timeouts(xprt, transport->sock); 673 674 /* Continue transmitting the packet/record. We must be careful 675 * to cope with writespace callbacks arriving _after_ we have 676 * called sendmsg(). */ 677 while (1) { 678 sent = 0; 679 status = xs_sendpages(transport->sock, NULL, 0, xdr, 680 req->rq_bytes_sent, zerocopy, &sent); 681 682 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 683 xdr->len - req->rq_bytes_sent, status); 684 685 /* If we've sent the entire packet, immediately 686 * reset the count of bytes sent. */ 687 req->rq_bytes_sent += sent; 688 req->rq_xmit_bytes_sent += sent; 689 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 690 req->rq_bytes_sent = 0; 691 return 0; 692 } 693 694 WARN_ON_ONCE(sent == 0 && status == 0); 695 696 if (status == -EAGAIN ) { 697 /* 698 * Return EAGAIN if we're sure we're hitting the 699 * socket send buffer limits. 700 */ 701 if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) 702 break; 703 /* 704 * Did we hit a memory allocation failure? 705 */ 706 if (sent == 0) { 707 status = -ENOBUFS; 708 if (vm_wait) 709 break; 710 /* Retry, knowing now that we're below the 711 * socket send buffer limit 712 */ 713 vm_wait = true; 714 } 715 continue; 716 } 717 if (status < 0) 718 break; 719 vm_wait = false; 720 } 721 722 switch (status) { 723 case -ENOTSOCK: 724 status = -ENOTCONN; 725 /* Should we call xs_close() here? */ 726 break; 727 case -EAGAIN: 728 status = xs_nospace(task); 729 break; 730 case -ECONNRESET: 731 case -ECONNREFUSED: 732 case -ENOTCONN: 733 case -EADDRINUSE: 734 case -ENOBUFS: 735 case -EPIPE: 736 break; 737 default: 738 dprintk("RPC: sendmsg returned unrecognized error %d\n", 739 -status); 740 } 741 742 return status; 743 } 744 745 /** 746 * xs_tcp_release_xprt - clean up after a tcp transmission 747 * @xprt: transport 748 * @task: rpc task 749 * 750 * This cleans up if an error causes us to abort the transmission of a request. 751 * In this case, the socket may need to be reset in order to avoid confusing 752 * the server. 753 */ 754 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 755 { 756 struct rpc_rqst *req; 757 758 if (task != xprt->snd_task) 759 return; 760 if (task == NULL) 761 goto out_release; 762 req = task->tk_rqstp; 763 if (req == NULL) 764 goto out_release; 765 if (req->rq_bytes_sent == 0) 766 goto out_release; 767 if (req->rq_bytes_sent == req->rq_snd_buf.len) 768 goto out_release; 769 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 770 out_release: 771 xprt_release_xprt(xprt, task); 772 } 773 774 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 775 { 776 transport->old_data_ready = sk->sk_data_ready; 777 transport->old_state_change = sk->sk_state_change; 778 transport->old_write_space = sk->sk_write_space; 779 transport->old_error_report = sk->sk_error_report; 780 } 781 782 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 783 { 784 sk->sk_data_ready = transport->old_data_ready; 785 sk->sk_state_change = transport->old_state_change; 786 sk->sk_write_space = transport->old_write_space; 787 sk->sk_error_report = transport->old_error_report; 788 } 789 790 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 791 { 792 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 793 794 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 795 } 796 797 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 798 { 799 smp_mb__before_atomic(); 800 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 801 clear_bit(XPRT_CLOSING, &xprt->state); 802 xs_sock_reset_state_flags(xprt); 803 smp_mb__after_atomic(); 804 } 805 806 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 807 { 808 xs_sock_reset_connection_flags(xprt); 809 /* Mark transport as closed and wake up all pending tasks */ 810 xprt_disconnect_done(xprt); 811 } 812 813 /** 814 * xs_error_report - callback to handle TCP socket state errors 815 * @sk: socket 816 * 817 * Note: we don't call sock_error() since there may be a rpc_task 818 * using the socket, and so we don't want to clear sk->sk_err. 819 */ 820 static void xs_error_report(struct sock *sk) 821 { 822 struct rpc_xprt *xprt; 823 int err; 824 825 read_lock_bh(&sk->sk_callback_lock); 826 if (!(xprt = xprt_from_sock(sk))) 827 goto out; 828 829 err = -sk->sk_err; 830 if (err == 0) 831 goto out; 832 /* Is this a reset event? */ 833 if (sk->sk_state == TCP_CLOSE) 834 xs_sock_mark_closed(xprt); 835 dprintk("RPC: xs_error_report client %p, error=%d...\n", 836 xprt, -err); 837 trace_rpc_socket_error(xprt, sk->sk_socket, err); 838 xprt_wake_pending_tasks(xprt, err); 839 out: 840 read_unlock_bh(&sk->sk_callback_lock); 841 } 842 843 static void xs_reset_transport(struct sock_xprt *transport) 844 { 845 struct socket *sock = transport->sock; 846 struct sock *sk = transport->inet; 847 struct rpc_xprt *xprt = &transport->xprt; 848 849 if (sk == NULL) 850 return; 851 852 if (atomic_read(&transport->xprt.swapper)) 853 sk_clear_memalloc(sk); 854 855 kernel_sock_shutdown(sock, SHUT_RDWR); 856 857 mutex_lock(&transport->recv_mutex); 858 write_lock_bh(&sk->sk_callback_lock); 859 transport->inet = NULL; 860 transport->sock = NULL; 861 862 sk->sk_user_data = NULL; 863 864 xs_restore_old_callbacks(transport, sk); 865 xprt_clear_connected(xprt); 866 write_unlock_bh(&sk->sk_callback_lock); 867 xs_sock_reset_connection_flags(xprt); 868 mutex_unlock(&transport->recv_mutex); 869 870 trace_rpc_socket_close(xprt, sock); 871 sock_release(sock); 872 } 873 874 /** 875 * xs_close - close a socket 876 * @xprt: transport 877 * 878 * This is used when all requests are complete; ie, no DRC state remains 879 * on the server we want to save. 880 * 881 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 882 * xs_reset_transport() zeroing the socket from underneath a writer. 883 */ 884 static void xs_close(struct rpc_xprt *xprt) 885 { 886 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 887 888 dprintk("RPC: xs_close xprt %p\n", xprt); 889 890 xs_reset_transport(transport); 891 xprt->reestablish_timeout = 0; 892 893 xprt_disconnect_done(xprt); 894 } 895 896 static void xs_inject_disconnect(struct rpc_xprt *xprt) 897 { 898 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 899 xprt); 900 xprt_disconnect_done(xprt); 901 } 902 903 static void xs_xprt_free(struct rpc_xprt *xprt) 904 { 905 xs_free_peer_addresses(xprt); 906 xprt_free(xprt); 907 } 908 909 /** 910 * xs_destroy - prepare to shutdown a transport 911 * @xprt: doomed transport 912 * 913 */ 914 static void xs_destroy(struct rpc_xprt *xprt) 915 { 916 struct sock_xprt *transport = container_of(xprt, 917 struct sock_xprt, xprt); 918 dprintk("RPC: xs_destroy xprt %p\n", xprt); 919 920 cancel_delayed_work_sync(&transport->connect_worker); 921 xs_close(xprt); 922 cancel_work_sync(&transport->recv_worker); 923 xs_xprt_free(xprt); 924 module_put(THIS_MODULE); 925 } 926 927 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 928 { 929 struct xdr_skb_reader desc = { 930 .skb = skb, 931 .offset = sizeof(rpc_fraghdr), 932 .count = skb->len - sizeof(rpc_fraghdr), 933 }; 934 935 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 936 return -1; 937 if (desc.count) 938 return -1; 939 return 0; 940 } 941 942 /** 943 * xs_local_data_read_skb 944 * @xprt: transport 945 * @sk: socket 946 * @skb: skbuff 947 * 948 * Currently this assumes we can read the whole reply in a single gulp. 949 */ 950 static void xs_local_data_read_skb(struct rpc_xprt *xprt, 951 struct sock *sk, 952 struct sk_buff *skb) 953 { 954 struct rpc_task *task; 955 struct rpc_rqst *rovr; 956 int repsize, copied; 957 u32 _xid; 958 __be32 *xp; 959 960 repsize = skb->len - sizeof(rpc_fraghdr); 961 if (repsize < 4) { 962 dprintk("RPC: impossible RPC reply size %d\n", repsize); 963 return; 964 } 965 966 /* Copy the XID from the skb... */ 967 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 968 if (xp == NULL) 969 return; 970 971 /* Look up and lock the request corresponding to the given XID */ 972 spin_lock_bh(&xprt->transport_lock); 973 rovr = xprt_lookup_rqst(xprt, *xp); 974 if (!rovr) 975 goto out_unlock; 976 task = rovr->rq_task; 977 978 copied = rovr->rq_private_buf.buflen; 979 if (copied > repsize) 980 copied = repsize; 981 982 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 983 dprintk("RPC: sk_buff copy failed\n"); 984 goto out_unlock; 985 } 986 987 xprt_complete_rqst(task, copied); 988 989 out_unlock: 990 spin_unlock_bh(&xprt->transport_lock); 991 } 992 993 static void xs_local_data_receive(struct sock_xprt *transport) 994 { 995 struct sk_buff *skb; 996 struct sock *sk; 997 int err; 998 999 mutex_lock(&transport->recv_mutex); 1000 sk = transport->inet; 1001 if (sk == NULL) 1002 goto out; 1003 for (;;) { 1004 skb = skb_recv_datagram(sk, 0, 1, &err); 1005 if (skb != NULL) { 1006 xs_local_data_read_skb(&transport->xprt, sk, skb); 1007 skb_free_datagram(sk, skb); 1008 continue; 1009 } 1010 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1011 break; 1012 } 1013 out: 1014 mutex_unlock(&transport->recv_mutex); 1015 } 1016 1017 static void xs_local_data_receive_workfn(struct work_struct *work) 1018 { 1019 struct sock_xprt *transport = 1020 container_of(work, struct sock_xprt, recv_worker); 1021 xs_local_data_receive(transport); 1022 } 1023 1024 /** 1025 * xs_udp_data_read_skb - receive callback for UDP sockets 1026 * @xprt: transport 1027 * @sk: socket 1028 * @skb: skbuff 1029 * 1030 */ 1031 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 1032 struct sock *sk, 1033 struct sk_buff *skb) 1034 { 1035 struct rpc_task *task; 1036 struct rpc_rqst *rovr; 1037 int repsize, copied; 1038 u32 _xid; 1039 __be32 *xp; 1040 1041 repsize = skb->len; 1042 if (repsize < 4) { 1043 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1044 return; 1045 } 1046 1047 /* Copy the XID from the skb... */ 1048 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1049 if (xp == NULL) 1050 return; 1051 1052 /* Look up and lock the request corresponding to the given XID */ 1053 spin_lock_bh(&xprt->transport_lock); 1054 rovr = xprt_lookup_rqst(xprt, *xp); 1055 if (!rovr) 1056 goto out_unlock; 1057 task = rovr->rq_task; 1058 1059 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1060 copied = repsize; 1061 1062 /* Suck it into the iovec, verify checksum if not done by hw. */ 1063 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1064 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1065 goto out_unlock; 1066 } 1067 1068 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1069 1070 xprt_adjust_cwnd(xprt, task, copied); 1071 xprt_complete_rqst(task, copied); 1072 1073 out_unlock: 1074 spin_unlock_bh(&xprt->transport_lock); 1075 } 1076 1077 static void xs_udp_data_receive(struct sock_xprt *transport) 1078 { 1079 struct sk_buff *skb; 1080 struct sock *sk; 1081 int err; 1082 1083 mutex_lock(&transport->recv_mutex); 1084 sk = transport->inet; 1085 if (sk == NULL) 1086 goto out; 1087 for (;;) { 1088 skb = skb_recv_udp(sk, 0, 1, &err); 1089 if (skb != NULL) { 1090 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1091 consume_skb(skb); 1092 continue; 1093 } 1094 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1095 break; 1096 } 1097 out: 1098 mutex_unlock(&transport->recv_mutex); 1099 } 1100 1101 static void xs_udp_data_receive_workfn(struct work_struct *work) 1102 { 1103 struct sock_xprt *transport = 1104 container_of(work, struct sock_xprt, recv_worker); 1105 xs_udp_data_receive(transport); 1106 } 1107 1108 /** 1109 * xs_data_ready - "data ready" callback for UDP sockets 1110 * @sk: socket with data to read 1111 * 1112 */ 1113 static void xs_data_ready(struct sock *sk) 1114 { 1115 struct rpc_xprt *xprt; 1116 1117 read_lock_bh(&sk->sk_callback_lock); 1118 dprintk("RPC: xs_data_ready...\n"); 1119 xprt = xprt_from_sock(sk); 1120 if (xprt != NULL) { 1121 struct sock_xprt *transport = container_of(xprt, 1122 struct sock_xprt, xprt); 1123 transport->old_data_ready(sk); 1124 /* Any data means we had a useful conversation, so 1125 * then we don't need to delay the next reconnect 1126 */ 1127 if (xprt->reestablish_timeout) 1128 xprt->reestablish_timeout = 0; 1129 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1130 queue_work(xprtiod_workqueue, &transport->recv_worker); 1131 } 1132 read_unlock_bh(&sk->sk_callback_lock); 1133 } 1134 1135 /* 1136 * Helper function to force a TCP close if the server is sending 1137 * junk and/or it has put us in CLOSE_WAIT 1138 */ 1139 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1140 { 1141 xprt_force_disconnect(xprt); 1142 } 1143 1144 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1145 { 1146 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1147 size_t len, used; 1148 char *p; 1149 1150 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1151 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1152 used = xdr_skb_read_bits(desc, p, len); 1153 transport->tcp_offset += used; 1154 if (used != len) 1155 return; 1156 1157 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1158 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1159 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1160 else 1161 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1162 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1163 1164 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1165 transport->tcp_offset = 0; 1166 1167 /* Sanity check of the record length */ 1168 if (unlikely(transport->tcp_reclen < 8)) { 1169 dprintk("RPC: invalid TCP record fragment length\n"); 1170 xs_tcp_force_close(xprt); 1171 return; 1172 } 1173 dprintk("RPC: reading TCP record fragment of length %d\n", 1174 transport->tcp_reclen); 1175 } 1176 1177 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1178 { 1179 if (transport->tcp_offset == transport->tcp_reclen) { 1180 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1181 transport->tcp_offset = 0; 1182 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1183 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1184 transport->tcp_flags |= TCP_RCV_COPY_XID; 1185 transport->tcp_copied = 0; 1186 } 1187 } 1188 } 1189 1190 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1191 { 1192 size_t len, used; 1193 char *p; 1194 1195 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1196 dprintk("RPC: reading XID (%zu bytes)\n", len); 1197 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1198 used = xdr_skb_read_bits(desc, p, len); 1199 transport->tcp_offset += used; 1200 if (used != len) 1201 return; 1202 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1203 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1204 transport->tcp_copied = 4; 1205 dprintk("RPC: reading %s XID %08x\n", 1206 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1207 : "request with", 1208 ntohl(transport->tcp_xid)); 1209 xs_tcp_check_fraghdr(transport); 1210 } 1211 1212 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1213 struct xdr_skb_reader *desc) 1214 { 1215 size_t len, used; 1216 u32 offset; 1217 char *p; 1218 1219 /* 1220 * We want transport->tcp_offset to be 8 at the end of this routine 1221 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1222 * When this function is called for the first time, 1223 * transport->tcp_offset is 4 (after having already read the xid). 1224 */ 1225 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1226 len = sizeof(transport->tcp_calldir) - offset; 1227 dprintk("RPC: reading CALL/REPLY flag (%zu bytes)\n", len); 1228 p = ((char *) &transport->tcp_calldir) + offset; 1229 used = xdr_skb_read_bits(desc, p, len); 1230 transport->tcp_offset += used; 1231 if (used != len) 1232 return; 1233 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1234 /* 1235 * We don't yet have the XDR buffer, so we will write the calldir 1236 * out after we get the buffer from the 'struct rpc_rqst' 1237 */ 1238 switch (ntohl(transport->tcp_calldir)) { 1239 case RPC_REPLY: 1240 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1241 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1242 transport->tcp_flags |= TCP_RPC_REPLY; 1243 break; 1244 case RPC_CALL: 1245 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1246 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1247 transport->tcp_flags &= ~TCP_RPC_REPLY; 1248 break; 1249 default: 1250 dprintk("RPC: invalid request message type\n"); 1251 xs_tcp_force_close(&transport->xprt); 1252 } 1253 xs_tcp_check_fraghdr(transport); 1254 } 1255 1256 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1257 struct xdr_skb_reader *desc, 1258 struct rpc_rqst *req) 1259 { 1260 struct sock_xprt *transport = 1261 container_of(xprt, struct sock_xprt, xprt); 1262 struct xdr_buf *rcvbuf; 1263 size_t len; 1264 ssize_t r; 1265 1266 rcvbuf = &req->rq_private_buf; 1267 1268 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1269 /* 1270 * Save the RPC direction in the XDR buffer 1271 */ 1272 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1273 &transport->tcp_calldir, 1274 sizeof(transport->tcp_calldir)); 1275 transport->tcp_copied += sizeof(transport->tcp_calldir); 1276 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1277 } 1278 1279 len = desc->count; 1280 if (len > transport->tcp_reclen - transport->tcp_offset) { 1281 struct xdr_skb_reader my_desc; 1282 1283 len = transport->tcp_reclen - transport->tcp_offset; 1284 memcpy(&my_desc, desc, sizeof(my_desc)); 1285 my_desc.count = len; 1286 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1287 &my_desc, xdr_skb_read_bits); 1288 desc->count -= r; 1289 desc->offset += r; 1290 } else 1291 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1292 desc, xdr_skb_read_bits); 1293 1294 if (r > 0) { 1295 transport->tcp_copied += r; 1296 transport->tcp_offset += r; 1297 } 1298 if (r != len) { 1299 /* Error when copying to the receive buffer, 1300 * usually because we weren't able to allocate 1301 * additional buffer pages. All we can do now 1302 * is turn off TCP_RCV_COPY_DATA, so the request 1303 * will not receive any additional updates, 1304 * and time out. 1305 * Any remaining data from this record will 1306 * be discarded. 1307 */ 1308 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1309 dprintk("RPC: XID %08x truncated request\n", 1310 ntohl(transport->tcp_xid)); 1311 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1312 "tcp_offset = %u, tcp_reclen = %u\n", 1313 xprt, transport->tcp_copied, 1314 transport->tcp_offset, transport->tcp_reclen); 1315 return; 1316 } 1317 1318 dprintk("RPC: XID %08x read %zd bytes\n", 1319 ntohl(transport->tcp_xid), r); 1320 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1321 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1322 transport->tcp_offset, transport->tcp_reclen); 1323 1324 if (transport->tcp_copied == req->rq_private_buf.buflen) 1325 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1326 else if (transport->tcp_offset == transport->tcp_reclen) { 1327 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1328 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1329 } 1330 } 1331 1332 /* 1333 * Finds the request corresponding to the RPC xid and invokes the common 1334 * tcp read code to read the data. 1335 */ 1336 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1337 struct xdr_skb_reader *desc) 1338 { 1339 struct sock_xprt *transport = 1340 container_of(xprt, struct sock_xprt, xprt); 1341 struct rpc_rqst *req; 1342 1343 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1344 1345 /* Find and lock the request corresponding to this xid */ 1346 spin_lock_bh(&xprt->transport_lock); 1347 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1348 if (!req) { 1349 dprintk("RPC: XID %08x request not found!\n", 1350 ntohl(transport->tcp_xid)); 1351 spin_unlock_bh(&xprt->transport_lock); 1352 return -1; 1353 } 1354 1355 xs_tcp_read_common(xprt, desc, req); 1356 1357 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1358 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1359 1360 spin_unlock_bh(&xprt->transport_lock); 1361 return 0; 1362 } 1363 1364 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1365 /* 1366 * Obtains an rpc_rqst previously allocated and invokes the common 1367 * tcp read code to read the data. The result is placed in the callback 1368 * queue. 1369 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1370 * connection and return -1. 1371 */ 1372 static int xs_tcp_read_callback(struct rpc_xprt *xprt, 1373 struct xdr_skb_reader *desc) 1374 { 1375 struct sock_xprt *transport = 1376 container_of(xprt, struct sock_xprt, xprt); 1377 struct rpc_rqst *req; 1378 1379 /* Look up and lock the request corresponding to the given XID */ 1380 spin_lock_bh(&xprt->transport_lock); 1381 req = xprt_lookup_bc_request(xprt, transport->tcp_xid); 1382 if (req == NULL) { 1383 spin_unlock_bh(&xprt->transport_lock); 1384 printk(KERN_WARNING "Callback slot table overflowed\n"); 1385 xprt_force_disconnect(xprt); 1386 return -1; 1387 } 1388 1389 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1390 xs_tcp_read_common(xprt, desc, req); 1391 1392 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1393 xprt_complete_bc_request(req, transport->tcp_copied); 1394 spin_unlock_bh(&xprt->transport_lock); 1395 1396 return 0; 1397 } 1398 1399 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1400 struct xdr_skb_reader *desc) 1401 { 1402 struct sock_xprt *transport = 1403 container_of(xprt, struct sock_xprt, xprt); 1404 1405 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1406 xs_tcp_read_reply(xprt, desc) : 1407 xs_tcp_read_callback(xprt, desc); 1408 } 1409 1410 static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net) 1411 { 1412 int ret; 1413 1414 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0, 1415 SVC_SOCK_ANONYMOUS); 1416 if (ret < 0) 1417 return ret; 1418 return 0; 1419 } 1420 1421 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) 1422 { 1423 return PAGE_SIZE; 1424 } 1425 #else 1426 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1427 struct xdr_skb_reader *desc) 1428 { 1429 return xs_tcp_read_reply(xprt, desc); 1430 } 1431 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1432 1433 /* 1434 * Read data off the transport. This can be either an RPC_CALL or an 1435 * RPC_REPLY. Relay the processing to helper functions. 1436 */ 1437 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1438 struct xdr_skb_reader *desc) 1439 { 1440 struct sock_xprt *transport = 1441 container_of(xprt, struct sock_xprt, xprt); 1442 1443 if (_xs_tcp_read_data(xprt, desc) == 0) 1444 xs_tcp_check_fraghdr(transport); 1445 else { 1446 /* 1447 * The transport_lock protects the request handling. 1448 * There's no need to hold it to update the tcp_flags. 1449 */ 1450 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1451 } 1452 } 1453 1454 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1455 { 1456 size_t len; 1457 1458 len = transport->tcp_reclen - transport->tcp_offset; 1459 if (len > desc->count) 1460 len = desc->count; 1461 desc->count -= len; 1462 desc->offset += len; 1463 transport->tcp_offset += len; 1464 dprintk("RPC: discarded %zu bytes\n", len); 1465 xs_tcp_check_fraghdr(transport); 1466 } 1467 1468 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1469 { 1470 struct rpc_xprt *xprt = rd_desc->arg.data; 1471 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1472 struct xdr_skb_reader desc = { 1473 .skb = skb, 1474 .offset = offset, 1475 .count = len, 1476 }; 1477 1478 dprintk("RPC: xs_tcp_data_recv started\n"); 1479 do { 1480 trace_xs_tcp_data_recv(transport); 1481 /* Read in a new fragment marker if necessary */ 1482 /* Can we ever really expect to get completely empty fragments? */ 1483 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1484 xs_tcp_read_fraghdr(xprt, &desc); 1485 continue; 1486 } 1487 /* Read in the xid if necessary */ 1488 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1489 xs_tcp_read_xid(transport, &desc); 1490 continue; 1491 } 1492 /* Read in the call/reply flag */ 1493 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1494 xs_tcp_read_calldir(transport, &desc); 1495 continue; 1496 } 1497 /* Read in the request data */ 1498 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1499 xs_tcp_read_data(xprt, &desc); 1500 continue; 1501 } 1502 /* Skip over any trailing bytes on short reads */ 1503 xs_tcp_read_discard(transport, &desc); 1504 } while (desc.count); 1505 trace_xs_tcp_data_recv(transport); 1506 dprintk("RPC: xs_tcp_data_recv done\n"); 1507 return len - desc.count; 1508 } 1509 1510 static void xs_tcp_data_receive(struct sock_xprt *transport) 1511 { 1512 struct rpc_xprt *xprt = &transport->xprt; 1513 struct sock *sk; 1514 read_descriptor_t rd_desc = { 1515 .count = 2*1024*1024, 1516 .arg.data = xprt, 1517 }; 1518 unsigned long total = 0; 1519 int read = 0; 1520 1521 mutex_lock(&transport->recv_mutex); 1522 sk = transport->inet; 1523 if (sk == NULL) 1524 goto out; 1525 1526 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1527 for (;;) { 1528 lock_sock(sk); 1529 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1530 if (read <= 0) { 1531 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 1532 release_sock(sk); 1533 if (!test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1534 break; 1535 } else { 1536 release_sock(sk); 1537 total += read; 1538 } 1539 rd_desc.count = 65536; 1540 } 1541 out: 1542 mutex_unlock(&transport->recv_mutex); 1543 trace_xs_tcp_data_ready(xprt, read, total); 1544 } 1545 1546 static void xs_tcp_data_receive_workfn(struct work_struct *work) 1547 { 1548 struct sock_xprt *transport = 1549 container_of(work, struct sock_xprt, recv_worker); 1550 xs_tcp_data_receive(transport); 1551 } 1552 1553 /** 1554 * xs_tcp_state_change - callback to handle TCP socket state changes 1555 * @sk: socket whose state has changed 1556 * 1557 */ 1558 static void xs_tcp_state_change(struct sock *sk) 1559 { 1560 struct rpc_xprt *xprt; 1561 struct sock_xprt *transport; 1562 1563 read_lock_bh(&sk->sk_callback_lock); 1564 if (!(xprt = xprt_from_sock(sk))) 1565 goto out; 1566 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1567 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1568 sk->sk_state, xprt_connected(xprt), 1569 sock_flag(sk, SOCK_DEAD), 1570 sock_flag(sk, SOCK_ZAPPED), 1571 sk->sk_shutdown); 1572 1573 transport = container_of(xprt, struct sock_xprt, xprt); 1574 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1575 switch (sk->sk_state) { 1576 case TCP_ESTABLISHED: 1577 spin_lock(&xprt->transport_lock); 1578 if (!xprt_test_and_set_connected(xprt)) { 1579 1580 /* Reset TCP record info */ 1581 transport->tcp_offset = 0; 1582 transport->tcp_reclen = 0; 1583 transport->tcp_copied = 0; 1584 transport->tcp_flags = 1585 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1586 xprt->connect_cookie++; 1587 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1588 xprt_clear_connecting(xprt); 1589 1590 xprt_wake_pending_tasks(xprt, -EAGAIN); 1591 } 1592 spin_unlock(&xprt->transport_lock); 1593 break; 1594 case TCP_FIN_WAIT1: 1595 /* The client initiated a shutdown of the socket */ 1596 xprt->connect_cookie++; 1597 xprt->reestablish_timeout = 0; 1598 set_bit(XPRT_CLOSING, &xprt->state); 1599 smp_mb__before_atomic(); 1600 clear_bit(XPRT_CONNECTED, &xprt->state); 1601 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1602 smp_mb__after_atomic(); 1603 break; 1604 case TCP_CLOSE_WAIT: 1605 /* The server initiated a shutdown of the socket */ 1606 xprt->connect_cookie++; 1607 clear_bit(XPRT_CONNECTED, &xprt->state); 1608 xs_tcp_force_close(xprt); 1609 case TCP_CLOSING: 1610 /* 1611 * If the server closed down the connection, make sure that 1612 * we back off before reconnecting 1613 */ 1614 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1615 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1616 break; 1617 case TCP_LAST_ACK: 1618 set_bit(XPRT_CLOSING, &xprt->state); 1619 smp_mb__before_atomic(); 1620 clear_bit(XPRT_CONNECTED, &xprt->state); 1621 smp_mb__after_atomic(); 1622 break; 1623 case TCP_CLOSE: 1624 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1625 &transport->sock_state)) 1626 xprt_clear_connecting(xprt); 1627 if (sk->sk_err) 1628 xprt_wake_pending_tasks(xprt, -sk->sk_err); 1629 xs_sock_mark_closed(xprt); 1630 } 1631 out: 1632 read_unlock_bh(&sk->sk_callback_lock); 1633 } 1634 1635 static void xs_write_space(struct sock *sk) 1636 { 1637 struct socket_wq *wq; 1638 struct rpc_xprt *xprt; 1639 1640 if (!sk->sk_socket) 1641 return; 1642 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1643 1644 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1645 return; 1646 rcu_read_lock(); 1647 wq = rcu_dereference(sk->sk_wq); 1648 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) 1649 goto out; 1650 1651 xprt_write_space(xprt); 1652 out: 1653 rcu_read_unlock(); 1654 } 1655 1656 /** 1657 * xs_udp_write_space - callback invoked when socket buffer space 1658 * becomes available 1659 * @sk: socket whose state has changed 1660 * 1661 * Called when more output buffer space is available for this socket. 1662 * We try not to wake our writers until they can make "significant" 1663 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1664 * with a bunch of small requests. 1665 */ 1666 static void xs_udp_write_space(struct sock *sk) 1667 { 1668 read_lock_bh(&sk->sk_callback_lock); 1669 1670 /* from net/core/sock.c:sock_def_write_space */ 1671 if (sock_writeable(sk)) 1672 xs_write_space(sk); 1673 1674 read_unlock_bh(&sk->sk_callback_lock); 1675 } 1676 1677 /** 1678 * xs_tcp_write_space - callback invoked when socket buffer space 1679 * becomes available 1680 * @sk: socket whose state has changed 1681 * 1682 * Called when more output buffer space is available for this socket. 1683 * We try not to wake our writers until they can make "significant" 1684 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1685 * with a bunch of small requests. 1686 */ 1687 static void xs_tcp_write_space(struct sock *sk) 1688 { 1689 read_lock_bh(&sk->sk_callback_lock); 1690 1691 /* from net/core/stream.c:sk_stream_write_space */ 1692 if (sk_stream_is_writeable(sk)) 1693 xs_write_space(sk); 1694 1695 read_unlock_bh(&sk->sk_callback_lock); 1696 } 1697 1698 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1699 { 1700 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1701 struct sock *sk = transport->inet; 1702 1703 if (transport->rcvsize) { 1704 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1705 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1706 } 1707 if (transport->sndsize) { 1708 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1709 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1710 sk->sk_write_space(sk); 1711 } 1712 } 1713 1714 /** 1715 * xs_udp_set_buffer_size - set send and receive limits 1716 * @xprt: generic transport 1717 * @sndsize: requested size of send buffer, in bytes 1718 * @rcvsize: requested size of receive buffer, in bytes 1719 * 1720 * Set socket send and receive buffer size limits. 1721 */ 1722 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1723 { 1724 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1725 1726 transport->sndsize = 0; 1727 if (sndsize) 1728 transport->sndsize = sndsize + 1024; 1729 transport->rcvsize = 0; 1730 if (rcvsize) 1731 transport->rcvsize = rcvsize + 1024; 1732 1733 xs_udp_do_set_buffer_size(xprt); 1734 } 1735 1736 /** 1737 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1738 * @task: task that timed out 1739 * 1740 * Adjust the congestion window after a retransmit timeout has occurred. 1741 */ 1742 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1743 { 1744 spin_lock_bh(&xprt->transport_lock); 1745 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1746 spin_unlock_bh(&xprt->transport_lock); 1747 } 1748 1749 static unsigned short xs_get_random_port(void) 1750 { 1751 unsigned short range = xprt_max_resvport - xprt_min_resvport + 1; 1752 unsigned short rand = (unsigned short) prandom_u32() % range; 1753 return rand + xprt_min_resvport; 1754 } 1755 1756 /** 1757 * xs_set_reuseaddr_port - set the socket's port and address reuse options 1758 * @sock: socket 1759 * 1760 * Note that this function has to be called on all sockets that share the 1761 * same port, and it must be called before binding. 1762 */ 1763 static void xs_sock_set_reuseport(struct socket *sock) 1764 { 1765 int opt = 1; 1766 1767 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, 1768 (char *)&opt, sizeof(opt)); 1769 } 1770 1771 static unsigned short xs_sock_getport(struct socket *sock) 1772 { 1773 struct sockaddr_storage buf; 1774 int buflen; 1775 unsigned short port = 0; 1776 1777 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0) 1778 goto out; 1779 switch (buf.ss_family) { 1780 case AF_INET6: 1781 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1782 break; 1783 case AF_INET: 1784 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1785 } 1786 out: 1787 return port; 1788 } 1789 1790 /** 1791 * xs_set_port - reset the port number in the remote endpoint address 1792 * @xprt: generic transport 1793 * @port: new port number 1794 * 1795 */ 1796 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1797 { 1798 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1799 1800 rpc_set_port(xs_addr(xprt), port); 1801 xs_update_peer_port(xprt); 1802 } 1803 1804 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1805 { 1806 if (transport->srcport == 0) 1807 transport->srcport = xs_sock_getport(sock); 1808 } 1809 1810 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1811 { 1812 unsigned short port = transport->srcport; 1813 1814 if (port == 0 && transport->xprt.resvport) 1815 port = xs_get_random_port(); 1816 return port; 1817 } 1818 1819 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1820 { 1821 if (transport->srcport != 0) 1822 transport->srcport = 0; 1823 if (!transport->xprt.resvport) 1824 return 0; 1825 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1826 return xprt_max_resvport; 1827 return --port; 1828 } 1829 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1830 { 1831 struct sockaddr_storage myaddr; 1832 int err, nloop = 0; 1833 unsigned short port = xs_get_srcport(transport); 1834 unsigned short last; 1835 1836 /* 1837 * If we are asking for any ephemeral port (i.e. port == 0 && 1838 * transport->xprt.resvport == 0), don't bind. Let the local 1839 * port selection happen implicitly when the socket is used 1840 * (for example at connect time). 1841 * 1842 * This ensures that we can continue to establish TCP 1843 * connections even when all local ephemeral ports are already 1844 * a part of some TCP connection. This makes no difference 1845 * for UDP sockets, but also doens't harm them. 1846 * 1847 * If we're asking for any reserved port (i.e. port == 0 && 1848 * transport->xprt.resvport == 1) xs_get_srcport above will 1849 * ensure that port is non-zero and we will bind as needed. 1850 */ 1851 if (port == 0) 1852 return 0; 1853 1854 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1855 do { 1856 rpc_set_port((struct sockaddr *)&myaddr, port); 1857 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1858 transport->xprt.addrlen); 1859 if (err == 0) { 1860 transport->srcport = port; 1861 break; 1862 } 1863 last = port; 1864 port = xs_next_srcport(transport, port); 1865 if (port > last) 1866 nloop++; 1867 } while (err == -EADDRINUSE && nloop != 2); 1868 1869 if (myaddr.ss_family == AF_INET) 1870 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1871 &((struct sockaddr_in *)&myaddr)->sin_addr, 1872 port, err ? "failed" : "ok", err); 1873 else 1874 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1875 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1876 port, err ? "failed" : "ok", err); 1877 return err; 1878 } 1879 1880 /* 1881 * We don't support autobind on AF_LOCAL sockets 1882 */ 1883 static void xs_local_rpcbind(struct rpc_task *task) 1884 { 1885 xprt_set_bound(task->tk_xprt); 1886 } 1887 1888 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1889 { 1890 } 1891 1892 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1893 static struct lock_class_key xs_key[2]; 1894 static struct lock_class_key xs_slock_key[2]; 1895 1896 static inline void xs_reclassify_socketu(struct socket *sock) 1897 { 1898 struct sock *sk = sock->sk; 1899 1900 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1901 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1902 } 1903 1904 static inline void xs_reclassify_socket4(struct socket *sock) 1905 { 1906 struct sock *sk = sock->sk; 1907 1908 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1909 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1910 } 1911 1912 static inline void xs_reclassify_socket6(struct socket *sock) 1913 { 1914 struct sock *sk = sock->sk; 1915 1916 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1917 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1918 } 1919 1920 static inline void xs_reclassify_socket(int family, struct socket *sock) 1921 { 1922 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1923 return; 1924 1925 switch (family) { 1926 case AF_LOCAL: 1927 xs_reclassify_socketu(sock); 1928 break; 1929 case AF_INET: 1930 xs_reclassify_socket4(sock); 1931 break; 1932 case AF_INET6: 1933 xs_reclassify_socket6(sock); 1934 break; 1935 } 1936 } 1937 #else 1938 static inline void xs_reclassify_socket(int family, struct socket *sock) 1939 { 1940 } 1941 #endif 1942 1943 static void xs_dummy_setup_socket(struct work_struct *work) 1944 { 1945 } 1946 1947 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1948 struct sock_xprt *transport, int family, int type, 1949 int protocol, bool reuseport) 1950 { 1951 struct socket *sock; 1952 int err; 1953 1954 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1955 if (err < 0) { 1956 dprintk("RPC: can't create %d transport socket (%d).\n", 1957 protocol, -err); 1958 goto out; 1959 } 1960 xs_reclassify_socket(family, sock); 1961 1962 if (reuseport) 1963 xs_sock_set_reuseport(sock); 1964 1965 err = xs_bind(transport, sock); 1966 if (err) { 1967 sock_release(sock); 1968 goto out; 1969 } 1970 1971 return sock; 1972 out: 1973 return ERR_PTR(err); 1974 } 1975 1976 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1977 struct socket *sock) 1978 { 1979 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1980 xprt); 1981 1982 if (!transport->inet) { 1983 struct sock *sk = sock->sk; 1984 1985 write_lock_bh(&sk->sk_callback_lock); 1986 1987 xs_save_old_callbacks(transport, sk); 1988 1989 sk->sk_user_data = xprt; 1990 sk->sk_data_ready = xs_data_ready; 1991 sk->sk_write_space = xs_udp_write_space; 1992 sock_set_flag(sk, SOCK_FASYNC); 1993 sk->sk_error_report = xs_error_report; 1994 sk->sk_allocation = GFP_NOIO; 1995 1996 xprt_clear_connected(xprt); 1997 1998 /* Reset to new socket */ 1999 transport->sock = sock; 2000 transport->inet = sk; 2001 2002 write_unlock_bh(&sk->sk_callback_lock); 2003 } 2004 2005 /* Tell the socket layer to start connecting... */ 2006 xprt->stat.connect_count++; 2007 xprt->stat.connect_start = jiffies; 2008 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 2009 } 2010 2011 /** 2012 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 2013 * @transport: socket transport to connect 2014 */ 2015 static int xs_local_setup_socket(struct sock_xprt *transport) 2016 { 2017 struct rpc_xprt *xprt = &transport->xprt; 2018 struct socket *sock; 2019 int status = -EIO; 2020 2021 status = __sock_create(xprt->xprt_net, AF_LOCAL, 2022 SOCK_STREAM, 0, &sock, 1); 2023 if (status < 0) { 2024 dprintk("RPC: can't create AF_LOCAL " 2025 "transport socket (%d).\n", -status); 2026 goto out; 2027 } 2028 xs_reclassify_socket(AF_LOCAL, sock); 2029 2030 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 2031 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2032 2033 status = xs_local_finish_connecting(xprt, sock); 2034 trace_rpc_socket_connect(xprt, sock, status); 2035 switch (status) { 2036 case 0: 2037 dprintk("RPC: xprt %p connected to %s\n", 2038 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2039 xprt_set_connected(xprt); 2040 case -ENOBUFS: 2041 break; 2042 case -ENOENT: 2043 dprintk("RPC: xprt %p: socket %s does not exist\n", 2044 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2045 break; 2046 case -ECONNREFUSED: 2047 dprintk("RPC: xprt %p: connection refused for %s\n", 2048 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2049 break; 2050 default: 2051 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 2052 __func__, -status, 2053 xprt->address_strings[RPC_DISPLAY_ADDR]); 2054 } 2055 2056 out: 2057 xprt_clear_connecting(xprt); 2058 xprt_wake_pending_tasks(xprt, status); 2059 return status; 2060 } 2061 2062 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2063 { 2064 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2065 int ret; 2066 2067 if (RPC_IS_ASYNC(task)) { 2068 /* 2069 * We want the AF_LOCAL connect to be resolved in the 2070 * filesystem namespace of the process making the rpc 2071 * call. Thus we connect synchronously. 2072 * 2073 * If we want to support asynchronous AF_LOCAL calls, 2074 * we'll need to figure out how to pass a namespace to 2075 * connect. 2076 */ 2077 rpc_exit(task, -ENOTCONN); 2078 return; 2079 } 2080 ret = xs_local_setup_socket(transport); 2081 if (ret && !RPC_IS_SOFTCONN(task)) 2082 msleep_interruptible(15000); 2083 } 2084 2085 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 2086 /* 2087 * Note that this should be called with XPRT_LOCKED held (or when we otherwise 2088 * know that we have exclusive access to the socket), to guard against 2089 * races with xs_reset_transport. 2090 */ 2091 static void xs_set_memalloc(struct rpc_xprt *xprt) 2092 { 2093 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2094 xprt); 2095 2096 /* 2097 * If there's no sock, then we have nothing to set. The 2098 * reconnecting process will get it for us. 2099 */ 2100 if (!transport->inet) 2101 return; 2102 if (atomic_read(&xprt->swapper)) 2103 sk_set_memalloc(transport->inet); 2104 } 2105 2106 /** 2107 * xs_enable_swap - Tag this transport as being used for swap. 2108 * @xprt: transport to tag 2109 * 2110 * Take a reference to this transport on behalf of the rpc_clnt, and 2111 * optionally mark it for swapping if it wasn't already. 2112 */ 2113 static int 2114 xs_enable_swap(struct rpc_xprt *xprt) 2115 { 2116 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2117 2118 if (atomic_inc_return(&xprt->swapper) != 1) 2119 return 0; 2120 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2121 return -ERESTARTSYS; 2122 if (xs->inet) 2123 sk_set_memalloc(xs->inet); 2124 xprt_release_xprt(xprt, NULL); 2125 return 0; 2126 } 2127 2128 /** 2129 * xs_disable_swap - Untag this transport as being used for swap. 2130 * @xprt: transport to tag 2131 * 2132 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2133 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2134 */ 2135 static void 2136 xs_disable_swap(struct rpc_xprt *xprt) 2137 { 2138 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2139 2140 if (!atomic_dec_and_test(&xprt->swapper)) 2141 return; 2142 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2143 return; 2144 if (xs->inet) 2145 sk_clear_memalloc(xs->inet); 2146 xprt_release_xprt(xprt, NULL); 2147 } 2148 #else 2149 static void xs_set_memalloc(struct rpc_xprt *xprt) 2150 { 2151 } 2152 2153 static int 2154 xs_enable_swap(struct rpc_xprt *xprt) 2155 { 2156 return -EINVAL; 2157 } 2158 2159 static void 2160 xs_disable_swap(struct rpc_xprt *xprt) 2161 { 2162 } 2163 #endif 2164 2165 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2166 { 2167 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2168 2169 if (!transport->inet) { 2170 struct sock *sk = sock->sk; 2171 2172 write_lock_bh(&sk->sk_callback_lock); 2173 2174 xs_save_old_callbacks(transport, sk); 2175 2176 sk->sk_user_data = xprt; 2177 sk->sk_data_ready = xs_data_ready; 2178 sk->sk_write_space = xs_udp_write_space; 2179 sock_set_flag(sk, SOCK_FASYNC); 2180 sk->sk_allocation = GFP_NOIO; 2181 2182 xprt_set_connected(xprt); 2183 2184 /* Reset to new socket */ 2185 transport->sock = sock; 2186 transport->inet = sk; 2187 2188 xs_set_memalloc(xprt); 2189 2190 write_unlock_bh(&sk->sk_callback_lock); 2191 } 2192 xs_udp_do_set_buffer_size(xprt); 2193 2194 xprt->stat.connect_start = jiffies; 2195 } 2196 2197 static void xs_udp_setup_socket(struct work_struct *work) 2198 { 2199 struct sock_xprt *transport = 2200 container_of(work, struct sock_xprt, connect_worker.work); 2201 struct rpc_xprt *xprt = &transport->xprt; 2202 struct socket *sock = transport->sock; 2203 int status = -EIO; 2204 2205 sock = xs_create_sock(xprt, transport, 2206 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2207 IPPROTO_UDP, false); 2208 if (IS_ERR(sock)) 2209 goto out; 2210 2211 dprintk("RPC: worker connecting xprt %p via %s to " 2212 "%s (port %s)\n", xprt, 2213 xprt->address_strings[RPC_DISPLAY_PROTO], 2214 xprt->address_strings[RPC_DISPLAY_ADDR], 2215 xprt->address_strings[RPC_DISPLAY_PORT]); 2216 2217 xs_udp_finish_connecting(xprt, sock); 2218 trace_rpc_socket_connect(xprt, sock, 0); 2219 status = 0; 2220 out: 2221 xprt_unlock_connect(xprt, transport); 2222 xprt_clear_connecting(xprt); 2223 xprt_wake_pending_tasks(xprt, status); 2224 } 2225 2226 /** 2227 * xs_tcp_shutdown - gracefully shut down a TCP socket 2228 * @xprt: transport 2229 * 2230 * Initiates a graceful shutdown of the TCP socket by calling the 2231 * equivalent of shutdown(SHUT_RDWR); 2232 */ 2233 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2234 { 2235 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2236 struct socket *sock = transport->sock; 2237 2238 if (sock == NULL) 2239 return; 2240 if (xprt_connected(xprt)) { 2241 kernel_sock_shutdown(sock, SHUT_RDWR); 2242 trace_rpc_socket_shutdown(xprt, sock); 2243 } else 2244 xs_reset_transport(transport); 2245 } 2246 2247 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 2248 struct socket *sock) 2249 { 2250 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2251 unsigned int keepidle; 2252 unsigned int keepcnt; 2253 unsigned int opt_on = 1; 2254 unsigned int timeo; 2255 2256 spin_lock_bh(&xprt->transport_lock); 2257 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); 2258 keepcnt = xprt->timeout->to_retries + 1; 2259 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2260 (xprt->timeout->to_retries + 1); 2261 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2262 spin_unlock_bh(&xprt->transport_lock); 2263 2264 /* TCP Keepalive options */ 2265 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2266 (char *)&opt_on, sizeof(opt_on)); 2267 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2268 (char *)&keepidle, sizeof(keepidle)); 2269 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2270 (char *)&keepidle, sizeof(keepidle)); 2271 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2272 (char *)&keepcnt, sizeof(keepcnt)); 2273 2274 /* TCP user timeout (see RFC5482) */ 2275 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, 2276 (char *)&timeo, sizeof(timeo)); 2277 } 2278 2279 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, 2280 unsigned long connect_timeout, 2281 unsigned long reconnect_timeout) 2282 { 2283 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2284 struct rpc_timeout to; 2285 unsigned long initval; 2286 2287 spin_lock_bh(&xprt->transport_lock); 2288 if (reconnect_timeout < xprt->max_reconnect_timeout) 2289 xprt->max_reconnect_timeout = reconnect_timeout; 2290 if (connect_timeout < xprt->connect_timeout) { 2291 memcpy(&to, xprt->timeout, sizeof(to)); 2292 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); 2293 /* Arbitrary lower limit */ 2294 if (initval < XS_TCP_INIT_REEST_TO << 1) 2295 initval = XS_TCP_INIT_REEST_TO << 1; 2296 to.to_initval = initval; 2297 to.to_maxval = initval; 2298 memcpy(&transport->tcp_timeout, &to, 2299 sizeof(transport->tcp_timeout)); 2300 xprt->timeout = &transport->tcp_timeout; 2301 xprt->connect_timeout = connect_timeout; 2302 } 2303 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2304 spin_unlock_bh(&xprt->transport_lock); 2305 } 2306 2307 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2308 { 2309 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2310 int ret = -ENOTCONN; 2311 2312 if (!transport->inet) { 2313 struct sock *sk = sock->sk; 2314 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC; 2315 2316 /* Avoid temporary address, they are bad for long-lived 2317 * connections such as NFS mounts. 2318 * RFC4941, section 3.6 suggests that: 2319 * Individual applications, which have specific 2320 * knowledge about the normal duration of connections, 2321 * MAY override this as appropriate. 2322 */ 2323 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES, 2324 (char *)&addr_pref, sizeof(addr_pref)); 2325 2326 xs_tcp_set_socket_timeouts(xprt, sock); 2327 2328 write_lock_bh(&sk->sk_callback_lock); 2329 2330 xs_save_old_callbacks(transport, sk); 2331 2332 sk->sk_user_data = xprt; 2333 sk->sk_data_ready = xs_data_ready; 2334 sk->sk_state_change = xs_tcp_state_change; 2335 sk->sk_write_space = xs_tcp_write_space; 2336 sock_set_flag(sk, SOCK_FASYNC); 2337 sk->sk_error_report = xs_error_report; 2338 sk->sk_allocation = GFP_NOIO; 2339 2340 /* socket options */ 2341 sock_reset_flag(sk, SOCK_LINGER); 2342 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2343 2344 xprt_clear_connected(xprt); 2345 2346 /* Reset to new socket */ 2347 transport->sock = sock; 2348 transport->inet = sk; 2349 2350 write_unlock_bh(&sk->sk_callback_lock); 2351 } 2352 2353 if (!xprt_bound(xprt)) 2354 goto out; 2355 2356 xs_set_memalloc(xprt); 2357 2358 /* Tell the socket layer to start connecting... */ 2359 xprt->stat.connect_count++; 2360 xprt->stat.connect_start = jiffies; 2361 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2362 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2363 switch (ret) { 2364 case 0: 2365 xs_set_srcport(transport, sock); 2366 case -EINPROGRESS: 2367 /* SYN_SENT! */ 2368 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2369 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2370 break; 2371 case -EADDRNOTAVAIL: 2372 /* Source port number is unavailable. Try a new one! */ 2373 transport->srcport = 0; 2374 } 2375 out: 2376 return ret; 2377 } 2378 2379 /** 2380 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2381 * 2382 * Invoked by a work queue tasklet. 2383 */ 2384 static void xs_tcp_setup_socket(struct work_struct *work) 2385 { 2386 struct sock_xprt *transport = 2387 container_of(work, struct sock_xprt, connect_worker.work); 2388 struct socket *sock = transport->sock; 2389 struct rpc_xprt *xprt = &transport->xprt; 2390 int status = -EIO; 2391 2392 if (!sock) { 2393 sock = xs_create_sock(xprt, transport, 2394 xs_addr(xprt)->sa_family, SOCK_STREAM, 2395 IPPROTO_TCP, true); 2396 if (IS_ERR(sock)) { 2397 status = PTR_ERR(sock); 2398 goto out; 2399 } 2400 } 2401 2402 dprintk("RPC: worker connecting xprt %p via %s to " 2403 "%s (port %s)\n", xprt, 2404 xprt->address_strings[RPC_DISPLAY_PROTO], 2405 xprt->address_strings[RPC_DISPLAY_ADDR], 2406 xprt->address_strings[RPC_DISPLAY_PORT]); 2407 2408 status = xs_tcp_finish_connecting(xprt, sock); 2409 trace_rpc_socket_connect(xprt, sock, status); 2410 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2411 xprt, -status, xprt_connected(xprt), 2412 sock->sk->sk_state); 2413 switch (status) { 2414 default: 2415 printk("%s: connect returned unhandled error %d\n", 2416 __func__, status); 2417 case -EADDRNOTAVAIL: 2418 /* We're probably in TIME_WAIT. Get rid of existing socket, 2419 * and retry 2420 */ 2421 xs_tcp_force_close(xprt); 2422 break; 2423 case 0: 2424 case -EINPROGRESS: 2425 case -EALREADY: 2426 xprt_unlock_connect(xprt, transport); 2427 return; 2428 case -EINVAL: 2429 /* Happens, for instance, if the user specified a link 2430 * local IPv6 address without a scope-id. 2431 */ 2432 case -ECONNREFUSED: 2433 case -ECONNRESET: 2434 case -ENETUNREACH: 2435 case -EADDRINUSE: 2436 case -ENOBUFS: 2437 /* 2438 * xs_tcp_force_close() wakes tasks with -EIO. 2439 * We need to wake them first to ensure the 2440 * correct error code. 2441 */ 2442 xprt_wake_pending_tasks(xprt, status); 2443 xs_tcp_force_close(xprt); 2444 goto out; 2445 } 2446 status = -EAGAIN; 2447 out: 2448 xprt_unlock_connect(xprt, transport); 2449 xprt_clear_connecting(xprt); 2450 xprt_wake_pending_tasks(xprt, status); 2451 } 2452 2453 static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt) 2454 { 2455 unsigned long start, now = jiffies; 2456 2457 start = xprt->stat.connect_start + xprt->reestablish_timeout; 2458 if (time_after(start, now)) 2459 return start - now; 2460 return 0; 2461 } 2462 2463 static void xs_reconnect_backoff(struct rpc_xprt *xprt) 2464 { 2465 xprt->reestablish_timeout <<= 1; 2466 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout) 2467 xprt->reestablish_timeout = xprt->max_reconnect_timeout; 2468 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2469 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2470 } 2471 2472 /** 2473 * xs_connect - connect a socket to a remote endpoint 2474 * @xprt: pointer to transport structure 2475 * @task: address of RPC task that manages state of connect request 2476 * 2477 * TCP: If the remote end dropped the connection, delay reconnecting. 2478 * 2479 * UDP socket connects are synchronous, but we use a work queue anyway 2480 * to guarantee that even unprivileged user processes can set up a 2481 * socket on a privileged port. 2482 * 2483 * If a UDP socket connect fails, the delay behavior here prevents 2484 * retry floods (hard mounts). 2485 */ 2486 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2487 { 2488 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2489 unsigned long delay = 0; 2490 2491 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2492 2493 if (transport->sock != NULL) { 2494 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2495 "seconds\n", 2496 xprt, xprt->reestablish_timeout / HZ); 2497 2498 /* Start by resetting any existing state */ 2499 xs_reset_transport(transport); 2500 2501 delay = xs_reconnect_delay(xprt); 2502 xs_reconnect_backoff(xprt); 2503 2504 } else 2505 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2506 2507 queue_delayed_work(xprtiod_workqueue, 2508 &transport->connect_worker, 2509 delay); 2510 } 2511 2512 /** 2513 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2514 * @xprt: rpc_xprt struct containing statistics 2515 * @seq: output file 2516 * 2517 */ 2518 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2519 { 2520 long idle_time = 0; 2521 2522 if (xprt_connected(xprt)) 2523 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2524 2525 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2526 "%llu %llu %lu %llu %llu\n", 2527 xprt->stat.bind_count, 2528 xprt->stat.connect_count, 2529 xprt->stat.connect_time, 2530 idle_time, 2531 xprt->stat.sends, 2532 xprt->stat.recvs, 2533 xprt->stat.bad_xids, 2534 xprt->stat.req_u, 2535 xprt->stat.bklog_u, 2536 xprt->stat.max_slots, 2537 xprt->stat.sending_u, 2538 xprt->stat.pending_u); 2539 } 2540 2541 /** 2542 * xs_udp_print_stats - display UDP socket-specifc stats 2543 * @xprt: rpc_xprt struct containing statistics 2544 * @seq: output file 2545 * 2546 */ 2547 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2548 { 2549 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2550 2551 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2552 "%lu %llu %llu\n", 2553 transport->srcport, 2554 xprt->stat.bind_count, 2555 xprt->stat.sends, 2556 xprt->stat.recvs, 2557 xprt->stat.bad_xids, 2558 xprt->stat.req_u, 2559 xprt->stat.bklog_u, 2560 xprt->stat.max_slots, 2561 xprt->stat.sending_u, 2562 xprt->stat.pending_u); 2563 } 2564 2565 /** 2566 * xs_tcp_print_stats - display TCP socket-specifc stats 2567 * @xprt: rpc_xprt struct containing statistics 2568 * @seq: output file 2569 * 2570 */ 2571 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2572 { 2573 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2574 long idle_time = 0; 2575 2576 if (xprt_connected(xprt)) 2577 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2578 2579 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2580 "%llu %llu %lu %llu %llu\n", 2581 transport->srcport, 2582 xprt->stat.bind_count, 2583 xprt->stat.connect_count, 2584 xprt->stat.connect_time, 2585 idle_time, 2586 xprt->stat.sends, 2587 xprt->stat.recvs, 2588 xprt->stat.bad_xids, 2589 xprt->stat.req_u, 2590 xprt->stat.bklog_u, 2591 xprt->stat.max_slots, 2592 xprt->stat.sending_u, 2593 xprt->stat.pending_u); 2594 } 2595 2596 /* 2597 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2598 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2599 * to use the server side send routines. 2600 */ 2601 static int bc_malloc(struct rpc_task *task) 2602 { 2603 struct rpc_rqst *rqst = task->tk_rqstp; 2604 size_t size = rqst->rq_callsize; 2605 struct page *page; 2606 struct rpc_buffer *buf; 2607 2608 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { 2609 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", 2610 size); 2611 return -EINVAL; 2612 } 2613 2614 page = alloc_page(GFP_KERNEL); 2615 if (!page) 2616 return -ENOMEM; 2617 2618 buf = page_address(page); 2619 buf->len = PAGE_SIZE; 2620 2621 rqst->rq_buffer = buf->data; 2622 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; 2623 return 0; 2624 } 2625 2626 /* 2627 * Free the space allocated in the bc_alloc routine 2628 */ 2629 static void bc_free(struct rpc_task *task) 2630 { 2631 void *buffer = task->tk_rqstp->rq_buffer; 2632 struct rpc_buffer *buf; 2633 2634 buf = container_of(buffer, struct rpc_buffer, data); 2635 free_page((unsigned long)buf); 2636 } 2637 2638 /* 2639 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2640 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2641 */ 2642 static int bc_sendto(struct rpc_rqst *req) 2643 { 2644 int len; 2645 struct xdr_buf *xbufp = &req->rq_snd_buf; 2646 struct rpc_xprt *xprt = req->rq_xprt; 2647 struct sock_xprt *transport = 2648 container_of(xprt, struct sock_xprt, xprt); 2649 struct socket *sock = transport->sock; 2650 unsigned long headoff; 2651 unsigned long tailoff; 2652 2653 xs_encode_stream_record_marker(xbufp); 2654 2655 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2656 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2657 len = svc_send_common(sock, xbufp, 2658 virt_to_page(xbufp->head[0].iov_base), headoff, 2659 xbufp->tail[0].iov_base, tailoff); 2660 2661 if (len != xbufp->len) { 2662 printk(KERN_NOTICE "Error sending entire callback!\n"); 2663 len = -EAGAIN; 2664 } 2665 2666 return len; 2667 } 2668 2669 /* 2670 * The send routine. Borrows from svc_send 2671 */ 2672 static int bc_send_request(struct rpc_task *task) 2673 { 2674 struct rpc_rqst *req = task->tk_rqstp; 2675 struct svc_xprt *xprt; 2676 int len; 2677 2678 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2679 /* 2680 * Get the server socket associated with this callback xprt 2681 */ 2682 xprt = req->rq_xprt->bc_xprt; 2683 2684 /* 2685 * Grab the mutex to serialize data as the connection is shared 2686 * with the fore channel 2687 */ 2688 if (!mutex_trylock(&xprt->xpt_mutex)) { 2689 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2690 if (!mutex_trylock(&xprt->xpt_mutex)) 2691 return -EAGAIN; 2692 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2693 } 2694 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2695 len = -ENOTCONN; 2696 else 2697 len = bc_sendto(req); 2698 mutex_unlock(&xprt->xpt_mutex); 2699 2700 if (len > 0) 2701 len = 0; 2702 2703 return len; 2704 } 2705 2706 /* 2707 * The close routine. Since this is client initiated, we do nothing 2708 */ 2709 2710 static void bc_close(struct rpc_xprt *xprt) 2711 { 2712 } 2713 2714 /* 2715 * The xprt destroy routine. Again, because this connection is client 2716 * initiated, we do nothing 2717 */ 2718 2719 static void bc_destroy(struct rpc_xprt *xprt) 2720 { 2721 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2722 2723 xs_xprt_free(xprt); 2724 module_put(THIS_MODULE); 2725 } 2726 2727 static struct rpc_xprt_ops xs_local_ops = { 2728 .reserve_xprt = xprt_reserve_xprt, 2729 .release_xprt = xs_tcp_release_xprt, 2730 .alloc_slot = xprt_alloc_slot, 2731 .rpcbind = xs_local_rpcbind, 2732 .set_port = xs_local_set_port, 2733 .connect = xs_local_connect, 2734 .buf_alloc = rpc_malloc, 2735 .buf_free = rpc_free, 2736 .send_request = xs_local_send_request, 2737 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2738 .close = xs_close, 2739 .destroy = xs_destroy, 2740 .print_stats = xs_local_print_stats, 2741 .enable_swap = xs_enable_swap, 2742 .disable_swap = xs_disable_swap, 2743 }; 2744 2745 static struct rpc_xprt_ops xs_udp_ops = { 2746 .set_buffer_size = xs_udp_set_buffer_size, 2747 .reserve_xprt = xprt_reserve_xprt_cong, 2748 .release_xprt = xprt_release_xprt_cong, 2749 .alloc_slot = xprt_alloc_slot, 2750 .rpcbind = rpcb_getport_async, 2751 .set_port = xs_set_port, 2752 .connect = xs_connect, 2753 .buf_alloc = rpc_malloc, 2754 .buf_free = rpc_free, 2755 .send_request = xs_udp_send_request, 2756 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2757 .timer = xs_udp_timer, 2758 .release_request = xprt_release_rqst_cong, 2759 .close = xs_close, 2760 .destroy = xs_destroy, 2761 .print_stats = xs_udp_print_stats, 2762 .enable_swap = xs_enable_swap, 2763 .disable_swap = xs_disable_swap, 2764 .inject_disconnect = xs_inject_disconnect, 2765 }; 2766 2767 static struct rpc_xprt_ops xs_tcp_ops = { 2768 .reserve_xprt = xprt_reserve_xprt, 2769 .release_xprt = xs_tcp_release_xprt, 2770 .alloc_slot = xprt_lock_and_alloc_slot, 2771 .rpcbind = rpcb_getport_async, 2772 .set_port = xs_set_port, 2773 .connect = xs_connect, 2774 .buf_alloc = rpc_malloc, 2775 .buf_free = rpc_free, 2776 .send_request = xs_tcp_send_request, 2777 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2778 .close = xs_tcp_shutdown, 2779 .destroy = xs_destroy, 2780 .set_connect_timeout = xs_tcp_set_connect_timeout, 2781 .print_stats = xs_tcp_print_stats, 2782 .enable_swap = xs_enable_swap, 2783 .disable_swap = xs_disable_swap, 2784 .inject_disconnect = xs_inject_disconnect, 2785 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2786 .bc_setup = xprt_setup_bc, 2787 .bc_up = xs_tcp_bc_up, 2788 .bc_maxpayload = xs_tcp_bc_maxpayload, 2789 .bc_free_rqst = xprt_free_bc_rqst, 2790 .bc_destroy = xprt_destroy_bc, 2791 #endif 2792 }; 2793 2794 /* 2795 * The rpc_xprt_ops for the server backchannel 2796 */ 2797 2798 static struct rpc_xprt_ops bc_tcp_ops = { 2799 .reserve_xprt = xprt_reserve_xprt, 2800 .release_xprt = xprt_release_xprt, 2801 .alloc_slot = xprt_alloc_slot, 2802 .buf_alloc = bc_malloc, 2803 .buf_free = bc_free, 2804 .send_request = bc_send_request, 2805 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2806 .close = bc_close, 2807 .destroy = bc_destroy, 2808 .print_stats = xs_tcp_print_stats, 2809 .enable_swap = xs_enable_swap, 2810 .disable_swap = xs_disable_swap, 2811 .inject_disconnect = xs_inject_disconnect, 2812 }; 2813 2814 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2815 { 2816 static const struct sockaddr_in sin = { 2817 .sin_family = AF_INET, 2818 .sin_addr.s_addr = htonl(INADDR_ANY), 2819 }; 2820 static const struct sockaddr_in6 sin6 = { 2821 .sin6_family = AF_INET6, 2822 .sin6_addr = IN6ADDR_ANY_INIT, 2823 }; 2824 2825 switch (family) { 2826 case AF_LOCAL: 2827 break; 2828 case AF_INET: 2829 memcpy(sap, &sin, sizeof(sin)); 2830 break; 2831 case AF_INET6: 2832 memcpy(sap, &sin6, sizeof(sin6)); 2833 break; 2834 default: 2835 dprintk("RPC: %s: Bad address family\n", __func__); 2836 return -EAFNOSUPPORT; 2837 } 2838 return 0; 2839 } 2840 2841 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2842 unsigned int slot_table_size, 2843 unsigned int max_slot_table_size) 2844 { 2845 struct rpc_xprt *xprt; 2846 struct sock_xprt *new; 2847 2848 if (args->addrlen > sizeof(xprt->addr)) { 2849 dprintk("RPC: xs_setup_xprt: address too large\n"); 2850 return ERR_PTR(-EBADF); 2851 } 2852 2853 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2854 max_slot_table_size); 2855 if (xprt == NULL) { 2856 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2857 "rpc_xprt\n"); 2858 return ERR_PTR(-ENOMEM); 2859 } 2860 2861 new = container_of(xprt, struct sock_xprt, xprt); 2862 mutex_init(&new->recv_mutex); 2863 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2864 xprt->addrlen = args->addrlen; 2865 if (args->srcaddr) 2866 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2867 else { 2868 int err; 2869 err = xs_init_anyaddr(args->dstaddr->sa_family, 2870 (struct sockaddr *)&new->srcaddr); 2871 if (err != 0) { 2872 xprt_free(xprt); 2873 return ERR_PTR(err); 2874 } 2875 } 2876 2877 return xprt; 2878 } 2879 2880 static const struct rpc_timeout xs_local_default_timeout = { 2881 .to_initval = 10 * HZ, 2882 .to_maxval = 10 * HZ, 2883 .to_retries = 2, 2884 }; 2885 2886 /** 2887 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2888 * @args: rpc transport creation arguments 2889 * 2890 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2891 */ 2892 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2893 { 2894 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2895 struct sock_xprt *transport; 2896 struct rpc_xprt *xprt; 2897 struct rpc_xprt *ret; 2898 2899 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2900 xprt_max_tcp_slot_table_entries); 2901 if (IS_ERR(xprt)) 2902 return xprt; 2903 transport = container_of(xprt, struct sock_xprt, xprt); 2904 2905 xprt->prot = 0; 2906 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2907 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2908 2909 xprt->bind_timeout = XS_BIND_TO; 2910 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2911 xprt->idle_timeout = XS_IDLE_DISC_TO; 2912 2913 xprt->ops = &xs_local_ops; 2914 xprt->timeout = &xs_local_default_timeout; 2915 2916 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn); 2917 INIT_DELAYED_WORK(&transport->connect_worker, 2918 xs_dummy_setup_socket); 2919 2920 switch (sun->sun_family) { 2921 case AF_LOCAL: 2922 if (sun->sun_path[0] != '/') { 2923 dprintk("RPC: bad AF_LOCAL address: %s\n", 2924 sun->sun_path); 2925 ret = ERR_PTR(-EINVAL); 2926 goto out_err; 2927 } 2928 xprt_set_bound(xprt); 2929 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2930 ret = ERR_PTR(xs_local_setup_socket(transport)); 2931 if (ret) 2932 goto out_err; 2933 break; 2934 default: 2935 ret = ERR_PTR(-EAFNOSUPPORT); 2936 goto out_err; 2937 } 2938 2939 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2940 xprt->address_strings[RPC_DISPLAY_ADDR]); 2941 2942 if (try_module_get(THIS_MODULE)) 2943 return xprt; 2944 ret = ERR_PTR(-EINVAL); 2945 out_err: 2946 xs_xprt_free(xprt); 2947 return ret; 2948 } 2949 2950 static const struct rpc_timeout xs_udp_default_timeout = { 2951 .to_initval = 5 * HZ, 2952 .to_maxval = 30 * HZ, 2953 .to_increment = 5 * HZ, 2954 .to_retries = 5, 2955 }; 2956 2957 /** 2958 * xs_setup_udp - Set up transport to use a UDP socket 2959 * @args: rpc transport creation arguments 2960 * 2961 */ 2962 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2963 { 2964 struct sockaddr *addr = args->dstaddr; 2965 struct rpc_xprt *xprt; 2966 struct sock_xprt *transport; 2967 struct rpc_xprt *ret; 2968 2969 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2970 xprt_udp_slot_table_entries); 2971 if (IS_ERR(xprt)) 2972 return xprt; 2973 transport = container_of(xprt, struct sock_xprt, xprt); 2974 2975 xprt->prot = IPPROTO_UDP; 2976 xprt->tsh_size = 0; 2977 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2978 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2979 2980 xprt->bind_timeout = XS_BIND_TO; 2981 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2982 xprt->idle_timeout = XS_IDLE_DISC_TO; 2983 2984 xprt->ops = &xs_udp_ops; 2985 2986 xprt->timeout = &xs_udp_default_timeout; 2987 2988 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2989 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 2990 2991 switch (addr->sa_family) { 2992 case AF_INET: 2993 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2994 xprt_set_bound(xprt); 2995 2996 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2997 break; 2998 case AF_INET6: 2999 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3000 xprt_set_bound(xprt); 3001 3002 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 3003 break; 3004 default: 3005 ret = ERR_PTR(-EAFNOSUPPORT); 3006 goto out_err; 3007 } 3008 3009 if (xprt_bound(xprt)) 3010 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3011 xprt->address_strings[RPC_DISPLAY_ADDR], 3012 xprt->address_strings[RPC_DISPLAY_PORT], 3013 xprt->address_strings[RPC_DISPLAY_PROTO]); 3014 else 3015 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3016 xprt->address_strings[RPC_DISPLAY_ADDR], 3017 xprt->address_strings[RPC_DISPLAY_PROTO]); 3018 3019 if (try_module_get(THIS_MODULE)) 3020 return xprt; 3021 ret = ERR_PTR(-EINVAL); 3022 out_err: 3023 xs_xprt_free(xprt); 3024 return ret; 3025 } 3026 3027 static const struct rpc_timeout xs_tcp_default_timeout = { 3028 .to_initval = 60 * HZ, 3029 .to_maxval = 60 * HZ, 3030 .to_retries = 2, 3031 }; 3032 3033 /** 3034 * xs_setup_tcp - Set up transport to use a TCP socket 3035 * @args: rpc transport creation arguments 3036 * 3037 */ 3038 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 3039 { 3040 struct sockaddr *addr = args->dstaddr; 3041 struct rpc_xprt *xprt; 3042 struct sock_xprt *transport; 3043 struct rpc_xprt *ret; 3044 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 3045 3046 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 3047 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 3048 3049 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3050 max_slot_table_size); 3051 if (IS_ERR(xprt)) 3052 return xprt; 3053 transport = container_of(xprt, struct sock_xprt, xprt); 3054 3055 xprt->prot = IPPROTO_TCP; 3056 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 3057 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3058 3059 xprt->bind_timeout = XS_BIND_TO; 3060 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 3061 xprt->idle_timeout = XS_IDLE_DISC_TO; 3062 3063 xprt->ops = &xs_tcp_ops; 3064 xprt->timeout = &xs_tcp_default_timeout; 3065 3066 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 3067 xprt->connect_timeout = xprt->timeout->to_initval * 3068 (xprt->timeout->to_retries + 1); 3069 3070 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn); 3071 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 3072 3073 switch (addr->sa_family) { 3074 case AF_INET: 3075 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3076 xprt_set_bound(xprt); 3077 3078 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 3079 break; 3080 case AF_INET6: 3081 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3082 xprt_set_bound(xprt); 3083 3084 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 3085 break; 3086 default: 3087 ret = ERR_PTR(-EAFNOSUPPORT); 3088 goto out_err; 3089 } 3090 3091 if (xprt_bound(xprt)) 3092 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3093 xprt->address_strings[RPC_DISPLAY_ADDR], 3094 xprt->address_strings[RPC_DISPLAY_PORT], 3095 xprt->address_strings[RPC_DISPLAY_PROTO]); 3096 else 3097 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3098 xprt->address_strings[RPC_DISPLAY_ADDR], 3099 xprt->address_strings[RPC_DISPLAY_PROTO]); 3100 3101 if (try_module_get(THIS_MODULE)) 3102 return xprt; 3103 ret = ERR_PTR(-EINVAL); 3104 out_err: 3105 xs_xprt_free(xprt); 3106 return ret; 3107 } 3108 3109 /** 3110 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 3111 * @args: rpc transport creation arguments 3112 * 3113 */ 3114 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 3115 { 3116 struct sockaddr *addr = args->dstaddr; 3117 struct rpc_xprt *xprt; 3118 struct sock_xprt *transport; 3119 struct svc_sock *bc_sock; 3120 struct rpc_xprt *ret; 3121 3122 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3123 xprt_tcp_slot_table_entries); 3124 if (IS_ERR(xprt)) 3125 return xprt; 3126 transport = container_of(xprt, struct sock_xprt, xprt); 3127 3128 xprt->prot = IPPROTO_TCP; 3129 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 3130 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3131 xprt->timeout = &xs_tcp_default_timeout; 3132 3133 /* backchannel */ 3134 xprt_set_bound(xprt); 3135 xprt->bind_timeout = 0; 3136 xprt->reestablish_timeout = 0; 3137 xprt->idle_timeout = 0; 3138 3139 xprt->ops = &bc_tcp_ops; 3140 3141 switch (addr->sa_family) { 3142 case AF_INET: 3143 xs_format_peer_addresses(xprt, "tcp", 3144 RPCBIND_NETID_TCP); 3145 break; 3146 case AF_INET6: 3147 xs_format_peer_addresses(xprt, "tcp", 3148 RPCBIND_NETID_TCP6); 3149 break; 3150 default: 3151 ret = ERR_PTR(-EAFNOSUPPORT); 3152 goto out_err; 3153 } 3154 3155 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3156 xprt->address_strings[RPC_DISPLAY_ADDR], 3157 xprt->address_strings[RPC_DISPLAY_PORT], 3158 xprt->address_strings[RPC_DISPLAY_PROTO]); 3159 3160 /* 3161 * Once we've associated a backchannel xprt with a connection, 3162 * we want to keep it around as long as the connection lasts, 3163 * in case we need to start using it for a backchannel again; 3164 * this reference won't be dropped until bc_xprt is destroyed. 3165 */ 3166 xprt_get(xprt); 3167 args->bc_xprt->xpt_bc_xprt = xprt; 3168 xprt->bc_xprt = args->bc_xprt; 3169 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3170 transport->sock = bc_sock->sk_sock; 3171 transport->inet = bc_sock->sk_sk; 3172 3173 /* 3174 * Since we don't want connections for the backchannel, we set 3175 * the xprt status to connected 3176 */ 3177 xprt_set_connected(xprt); 3178 3179 if (try_module_get(THIS_MODULE)) 3180 return xprt; 3181 3182 args->bc_xprt->xpt_bc_xprt = NULL; 3183 args->bc_xprt->xpt_bc_xps = NULL; 3184 xprt_put(xprt); 3185 ret = ERR_PTR(-EINVAL); 3186 out_err: 3187 xs_xprt_free(xprt); 3188 return ret; 3189 } 3190 3191 static struct xprt_class xs_local_transport = { 3192 .list = LIST_HEAD_INIT(xs_local_transport.list), 3193 .name = "named UNIX socket", 3194 .owner = THIS_MODULE, 3195 .ident = XPRT_TRANSPORT_LOCAL, 3196 .setup = xs_setup_local, 3197 }; 3198 3199 static struct xprt_class xs_udp_transport = { 3200 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3201 .name = "udp", 3202 .owner = THIS_MODULE, 3203 .ident = XPRT_TRANSPORT_UDP, 3204 .setup = xs_setup_udp, 3205 }; 3206 3207 static struct xprt_class xs_tcp_transport = { 3208 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3209 .name = "tcp", 3210 .owner = THIS_MODULE, 3211 .ident = XPRT_TRANSPORT_TCP, 3212 .setup = xs_setup_tcp, 3213 }; 3214 3215 static struct xprt_class xs_bc_tcp_transport = { 3216 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3217 .name = "tcp NFSv4.1 backchannel", 3218 .owner = THIS_MODULE, 3219 .ident = XPRT_TRANSPORT_BC_TCP, 3220 .setup = xs_setup_bc_tcp, 3221 }; 3222 3223 /** 3224 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3225 * 3226 */ 3227 int init_socket_xprt(void) 3228 { 3229 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3230 if (!sunrpc_table_header) 3231 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3232 #endif 3233 3234 xprt_register_transport(&xs_local_transport); 3235 xprt_register_transport(&xs_udp_transport); 3236 xprt_register_transport(&xs_tcp_transport); 3237 xprt_register_transport(&xs_bc_tcp_transport); 3238 3239 return 0; 3240 } 3241 3242 /** 3243 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3244 * 3245 */ 3246 void cleanup_socket_xprt(void) 3247 { 3248 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3249 if (sunrpc_table_header) { 3250 unregister_sysctl_table(sunrpc_table_header); 3251 sunrpc_table_header = NULL; 3252 } 3253 #endif 3254 3255 xprt_unregister_transport(&xs_local_transport); 3256 xprt_unregister_transport(&xs_udp_transport); 3257 xprt_unregister_transport(&xs_tcp_transport); 3258 xprt_unregister_transport(&xs_bc_tcp_transport); 3259 } 3260 3261 static int param_set_uint_minmax(const char *val, 3262 const struct kernel_param *kp, 3263 unsigned int min, unsigned int max) 3264 { 3265 unsigned int num; 3266 int ret; 3267 3268 if (!val) 3269 return -EINVAL; 3270 ret = kstrtouint(val, 0, &num); 3271 if (ret) 3272 return ret; 3273 if (num < min || num > max) 3274 return -EINVAL; 3275 *((unsigned int *)kp->arg) = num; 3276 return 0; 3277 } 3278 3279 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3280 { 3281 if (kp->arg == &xprt_min_resvport) 3282 return param_set_uint_minmax(val, kp, 3283 RPC_MIN_RESVPORT, 3284 xprt_max_resvport); 3285 return param_set_uint_minmax(val, kp, 3286 xprt_min_resvport, 3287 RPC_MAX_RESVPORT); 3288 } 3289 3290 static const struct kernel_param_ops param_ops_portnr = { 3291 .set = param_set_portnr, 3292 .get = param_get_uint, 3293 }; 3294 3295 #define param_check_portnr(name, p) \ 3296 __param_check(name, p, unsigned int); 3297 3298 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3299 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3300 3301 static int param_set_slot_table_size(const char *val, 3302 const struct kernel_param *kp) 3303 { 3304 return param_set_uint_minmax(val, kp, 3305 RPC_MIN_SLOT_TABLE, 3306 RPC_MAX_SLOT_TABLE); 3307 } 3308 3309 static const struct kernel_param_ops param_ops_slot_table_size = { 3310 .set = param_set_slot_table_size, 3311 .get = param_get_uint, 3312 }; 3313 3314 #define param_check_slot_table_size(name, p) \ 3315 __param_check(name, p, unsigned int); 3316 3317 static int param_set_max_slot_table_size(const char *val, 3318 const struct kernel_param *kp) 3319 { 3320 return param_set_uint_minmax(val, kp, 3321 RPC_MIN_SLOT_TABLE, 3322 RPC_MAX_SLOT_TABLE_LIMIT); 3323 } 3324 3325 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3326 .set = param_set_max_slot_table_size, 3327 .get = param_get_uint, 3328 }; 3329 3330 #define param_check_max_slot_table_size(name, p) \ 3331 __param_check(name, p, unsigned int); 3332 3333 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3334 slot_table_size, 0644); 3335 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3336 max_slot_table_size, 0644); 3337 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3338 slot_table_size, 0644); 3339 3340