1 /* 2 * linux/net/sunrpc/xprtsock.c 3 * 4 * Client-side transport implementation for sockets. 5 * 6 * TCP callback races fixes (C) 1998 Red Hat 7 * TCP send fixes (C) 1998 Red Hat 8 * TCP NFS related read + write fixes 9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 10 * 11 * Rewrite of larges part of the code in order to stabilize TCP stuff. 12 * Fix behaviour when socket buffer is full. 13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 14 * 15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 16 * 17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. 18 * <gilles.quillard@bull.net> 19 */ 20 21 #include <linux/types.h> 22 #include <linux/string.h> 23 #include <linux/slab.h> 24 #include <linux/module.h> 25 #include <linux/capability.h> 26 #include <linux/pagemap.h> 27 #include <linux/errno.h> 28 #include <linux/socket.h> 29 #include <linux/in.h> 30 #include <linux/net.h> 31 #include <linux/mm.h> 32 #include <linux/un.h> 33 #include <linux/udp.h> 34 #include <linux/tcp.h> 35 #include <linux/sunrpc/clnt.h> 36 #include <linux/sunrpc/addr.h> 37 #include <linux/sunrpc/sched.h> 38 #include <linux/sunrpc/svcsock.h> 39 #include <linux/sunrpc/xprtsock.h> 40 #include <linux/file.h> 41 #ifdef CONFIG_SUNRPC_BACKCHANNEL 42 #include <linux/sunrpc/bc_xprt.h> 43 #endif 44 45 #include <net/sock.h> 46 #include <net/checksum.h> 47 #include <net/udp.h> 48 #include <net/tcp.h> 49 50 #include <trace/events/sunrpc.h> 51 52 #include "sunrpc.h" 53 54 static void xs_close(struct rpc_xprt *xprt); 55 56 /* 57 * xprtsock tunables 58 */ 59 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 60 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 61 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 62 63 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 64 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 65 66 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 67 68 #define XS_TCP_LINGER_TO (15U * HZ) 69 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 70 71 /* 72 * We can register our own files under /proc/sys/sunrpc by 73 * calling register_sysctl_table() again. The files in that 74 * directory become the union of all files registered there. 75 * 76 * We simply need to make sure that we don't collide with 77 * someone else's file names! 78 */ 79 80 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 81 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 82 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 83 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 84 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 85 86 static struct ctl_table_header *sunrpc_table_header; 87 88 /* 89 * FIXME: changing the UDP slot table size should also resize the UDP 90 * socket buffers for existing UDP transports 91 */ 92 static struct ctl_table xs_tunables_table[] = { 93 { 94 .procname = "udp_slot_table_entries", 95 .data = &xprt_udp_slot_table_entries, 96 .maxlen = sizeof(unsigned int), 97 .mode = 0644, 98 .proc_handler = proc_dointvec_minmax, 99 .extra1 = &min_slot_table_size, 100 .extra2 = &max_slot_table_size 101 }, 102 { 103 .procname = "tcp_slot_table_entries", 104 .data = &xprt_tcp_slot_table_entries, 105 .maxlen = sizeof(unsigned int), 106 .mode = 0644, 107 .proc_handler = proc_dointvec_minmax, 108 .extra1 = &min_slot_table_size, 109 .extra2 = &max_slot_table_size 110 }, 111 { 112 .procname = "tcp_max_slot_table_entries", 113 .data = &xprt_max_tcp_slot_table_entries, 114 .maxlen = sizeof(unsigned int), 115 .mode = 0644, 116 .proc_handler = proc_dointvec_minmax, 117 .extra1 = &min_slot_table_size, 118 .extra2 = &max_tcp_slot_table_limit 119 }, 120 { 121 .procname = "min_resvport", 122 .data = &xprt_min_resvport, 123 .maxlen = sizeof(unsigned int), 124 .mode = 0644, 125 .proc_handler = proc_dointvec_minmax, 126 .extra1 = &xprt_min_resvport_limit, 127 .extra2 = &xprt_max_resvport_limit 128 }, 129 { 130 .procname = "max_resvport", 131 .data = &xprt_max_resvport, 132 .maxlen = sizeof(unsigned int), 133 .mode = 0644, 134 .proc_handler = proc_dointvec_minmax, 135 .extra1 = &xprt_min_resvport_limit, 136 .extra2 = &xprt_max_resvport_limit 137 }, 138 { 139 .procname = "tcp_fin_timeout", 140 .data = &xs_tcp_fin_timeout, 141 .maxlen = sizeof(xs_tcp_fin_timeout), 142 .mode = 0644, 143 .proc_handler = proc_dointvec_jiffies, 144 }, 145 { }, 146 }; 147 148 static struct ctl_table sunrpc_table[] = { 149 { 150 .procname = "sunrpc", 151 .mode = 0555, 152 .child = xs_tunables_table 153 }, 154 { }, 155 }; 156 157 #endif 158 159 /* 160 * Wait duration for a reply from the RPC portmapper. 161 */ 162 #define XS_BIND_TO (60U * HZ) 163 164 /* 165 * Delay if a UDP socket connect error occurs. This is most likely some 166 * kind of resource problem on the local host. 167 */ 168 #define XS_UDP_REEST_TO (2U * HZ) 169 170 /* 171 * The reestablish timeout allows clients to delay for a bit before attempting 172 * to reconnect to a server that just dropped our connection. 173 * 174 * We implement an exponential backoff when trying to reestablish a TCP 175 * transport connection with the server. Some servers like to drop a TCP 176 * connection when they are overworked, so we start with a short timeout and 177 * increase over time if the server is down or not responding. 178 */ 179 #define XS_TCP_INIT_REEST_TO (3U * HZ) 180 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 181 182 /* 183 * TCP idle timeout; client drops the transport socket if it is idle 184 * for this long. Note that we also timeout UDP sockets to prevent 185 * holding port numbers when there is no RPC traffic. 186 */ 187 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 188 189 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 190 # undef RPC_DEBUG_DATA 191 # define RPCDBG_FACILITY RPCDBG_TRANS 192 #endif 193 194 #ifdef RPC_DEBUG_DATA 195 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 196 { 197 u8 *buf = (u8 *) packet; 198 int j; 199 200 dprintk("RPC: %s\n", msg); 201 for (j = 0; j < count && j < 128; j += 4) { 202 if (!(j & 31)) { 203 if (j) 204 dprintk("\n"); 205 dprintk("0x%04x ", j); 206 } 207 dprintk("%02x%02x%02x%02x ", 208 buf[j], buf[j+1], buf[j+2], buf[j+3]); 209 } 210 dprintk("\n"); 211 } 212 #else 213 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 214 { 215 /* NOP */ 216 } 217 #endif 218 219 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 220 { 221 return (struct rpc_xprt *) sk->sk_user_data; 222 } 223 224 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 225 { 226 return (struct sockaddr *) &xprt->addr; 227 } 228 229 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 230 { 231 return (struct sockaddr_un *) &xprt->addr; 232 } 233 234 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 235 { 236 return (struct sockaddr_in *) &xprt->addr; 237 } 238 239 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 240 { 241 return (struct sockaddr_in6 *) &xprt->addr; 242 } 243 244 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 245 { 246 struct sockaddr *sap = xs_addr(xprt); 247 struct sockaddr_in6 *sin6; 248 struct sockaddr_in *sin; 249 struct sockaddr_un *sun; 250 char buf[128]; 251 252 switch (sap->sa_family) { 253 case AF_LOCAL: 254 sun = xs_addr_un(xprt); 255 strlcpy(buf, sun->sun_path, sizeof(buf)); 256 xprt->address_strings[RPC_DISPLAY_ADDR] = 257 kstrdup(buf, GFP_KERNEL); 258 break; 259 case AF_INET: 260 (void)rpc_ntop(sap, buf, sizeof(buf)); 261 xprt->address_strings[RPC_DISPLAY_ADDR] = 262 kstrdup(buf, GFP_KERNEL); 263 sin = xs_addr_in(xprt); 264 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 265 break; 266 case AF_INET6: 267 (void)rpc_ntop(sap, buf, sizeof(buf)); 268 xprt->address_strings[RPC_DISPLAY_ADDR] = 269 kstrdup(buf, GFP_KERNEL); 270 sin6 = xs_addr_in6(xprt); 271 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 272 break; 273 default: 274 BUG(); 275 } 276 277 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 278 } 279 280 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 281 { 282 struct sockaddr *sap = xs_addr(xprt); 283 char buf[128]; 284 285 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 286 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 287 288 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 289 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 290 } 291 292 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 293 const char *protocol, 294 const char *netid) 295 { 296 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 297 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 298 xs_format_common_peer_addresses(xprt); 299 xs_format_common_peer_ports(xprt); 300 } 301 302 static void xs_update_peer_port(struct rpc_xprt *xprt) 303 { 304 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 305 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 306 307 xs_format_common_peer_ports(xprt); 308 } 309 310 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 311 { 312 unsigned int i; 313 314 for (i = 0; i < RPC_DISPLAY_MAX; i++) 315 switch (i) { 316 case RPC_DISPLAY_PROTO: 317 case RPC_DISPLAY_NETID: 318 continue; 319 default: 320 kfree(xprt->address_strings[i]); 321 } 322 } 323 324 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 325 326 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 327 { 328 struct msghdr msg = { 329 .msg_name = addr, 330 .msg_namelen = addrlen, 331 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 332 }; 333 struct kvec iov = { 334 .iov_base = vec->iov_base + base, 335 .iov_len = vec->iov_len - base, 336 }; 337 338 if (iov.iov_len != 0) 339 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 340 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 341 } 342 343 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p) 344 { 345 ssize_t (*do_sendpage)(struct socket *sock, struct page *page, 346 int offset, size_t size, int flags); 347 struct page **ppage; 348 unsigned int remainder; 349 int err; 350 351 remainder = xdr->page_len - base; 352 base += xdr->page_base; 353 ppage = xdr->pages + (base >> PAGE_SHIFT); 354 base &= ~PAGE_MASK; 355 do_sendpage = sock->ops->sendpage; 356 if (!zerocopy) 357 do_sendpage = sock_no_sendpage; 358 for(;;) { 359 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 360 int flags = XS_SENDMSG_FLAGS; 361 362 remainder -= len; 363 if (more) 364 flags |= MSG_MORE; 365 if (remainder != 0) 366 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE; 367 err = do_sendpage(sock, *ppage, base, len, flags); 368 if (remainder == 0 || err != len) 369 break; 370 *sent_p += err; 371 ppage++; 372 base = 0; 373 } 374 if (err > 0) { 375 *sent_p += err; 376 err = 0; 377 } 378 return err; 379 } 380 381 /** 382 * xs_sendpages - write pages directly to a socket 383 * @sock: socket to send on 384 * @addr: UDP only -- address of destination 385 * @addrlen: UDP only -- length of destination address 386 * @xdr: buffer containing this request 387 * @base: starting position in the buffer 388 * @zerocopy: true if it is safe to use sendpage() 389 * @sent_p: return the total number of bytes successfully queued for sending 390 * 391 */ 392 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p) 393 { 394 unsigned int remainder = xdr->len - base; 395 int err = 0; 396 int sent = 0; 397 398 if (unlikely(!sock)) 399 return -ENOTSOCK; 400 401 if (base != 0) { 402 addr = NULL; 403 addrlen = 0; 404 } 405 406 if (base < xdr->head[0].iov_len || addr != NULL) { 407 unsigned int len = xdr->head[0].iov_len - base; 408 remainder -= len; 409 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 410 if (remainder == 0 || err != len) 411 goto out; 412 *sent_p += err; 413 base = 0; 414 } else 415 base -= xdr->head[0].iov_len; 416 417 if (base < xdr->page_len) { 418 unsigned int len = xdr->page_len - base; 419 remainder -= len; 420 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent); 421 *sent_p += sent; 422 if (remainder == 0 || sent != len) 423 goto out; 424 base = 0; 425 } else 426 base -= xdr->page_len; 427 428 if (base >= xdr->tail[0].iov_len) 429 return 0; 430 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 431 out: 432 if (err > 0) { 433 *sent_p += err; 434 err = 0; 435 } 436 return err; 437 } 438 439 static void xs_nospace_callback(struct rpc_task *task) 440 { 441 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 442 443 transport->inet->sk_write_pending--; 444 } 445 446 /** 447 * xs_nospace - place task on wait queue if transmit was incomplete 448 * @task: task to put to sleep 449 * 450 */ 451 static int xs_nospace(struct rpc_task *task) 452 { 453 struct rpc_rqst *req = task->tk_rqstp; 454 struct rpc_xprt *xprt = req->rq_xprt; 455 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 456 struct sock *sk = transport->inet; 457 int ret = -EAGAIN; 458 459 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 460 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 461 req->rq_slen); 462 463 /* Protect against races with write_space */ 464 spin_lock_bh(&xprt->transport_lock); 465 466 /* Don't race with disconnect */ 467 if (xprt_connected(xprt)) { 468 /* wait for more buffer space */ 469 sk->sk_write_pending++; 470 xprt_wait_for_buffer_space(task, xs_nospace_callback); 471 } else 472 ret = -ENOTCONN; 473 474 spin_unlock_bh(&xprt->transport_lock); 475 476 /* Race breaker in case memory is freed before above code is called */ 477 sk->sk_write_space(sk); 478 return ret; 479 } 480 481 /* 482 * Construct a stream transport record marker in @buf. 483 */ 484 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 485 { 486 u32 reclen = buf->len - sizeof(rpc_fraghdr); 487 rpc_fraghdr *base = buf->head[0].iov_base; 488 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 489 } 490 491 /** 492 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 493 * @task: RPC task that manages the state of an RPC request 494 * 495 * Return values: 496 * 0: The request has been sent 497 * EAGAIN: The socket was blocked, please call again later to 498 * complete the request 499 * ENOTCONN: Caller needs to invoke connect logic then call again 500 * other: Some other error occured, the request was not sent 501 */ 502 static int xs_local_send_request(struct rpc_task *task) 503 { 504 struct rpc_rqst *req = task->tk_rqstp; 505 struct rpc_xprt *xprt = req->rq_xprt; 506 struct sock_xprt *transport = 507 container_of(xprt, struct sock_xprt, xprt); 508 struct xdr_buf *xdr = &req->rq_snd_buf; 509 int status; 510 int sent = 0; 511 512 xs_encode_stream_record_marker(&req->rq_snd_buf); 513 514 xs_pktdump("packet data:", 515 req->rq_svec->iov_base, req->rq_svec->iov_len); 516 517 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent, 518 true, &sent); 519 dprintk("RPC: %s(%u) = %d\n", 520 __func__, xdr->len - req->rq_bytes_sent, status); 521 522 if (status == -EAGAIN && sock_writeable(transport->inet)) 523 status = -ENOBUFS; 524 525 if (likely(sent > 0) || status == 0) { 526 req->rq_bytes_sent += sent; 527 req->rq_xmit_bytes_sent += sent; 528 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 529 req->rq_bytes_sent = 0; 530 return 0; 531 } 532 status = -EAGAIN; 533 } 534 535 switch (status) { 536 case -ENOBUFS: 537 break; 538 case -EAGAIN: 539 status = xs_nospace(task); 540 break; 541 default: 542 dprintk("RPC: sendmsg returned unrecognized error %d\n", 543 -status); 544 case -EPIPE: 545 xs_close(xprt); 546 status = -ENOTCONN; 547 } 548 549 return status; 550 } 551 552 /** 553 * xs_udp_send_request - write an RPC request to a UDP socket 554 * @task: address of RPC task that manages the state of an RPC request 555 * 556 * Return values: 557 * 0: The request has been sent 558 * EAGAIN: The socket was blocked, please call again later to 559 * complete the request 560 * ENOTCONN: Caller needs to invoke connect logic then call again 561 * other: Some other error occurred, the request was not sent 562 */ 563 static int xs_udp_send_request(struct rpc_task *task) 564 { 565 struct rpc_rqst *req = task->tk_rqstp; 566 struct rpc_xprt *xprt = req->rq_xprt; 567 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 568 struct xdr_buf *xdr = &req->rq_snd_buf; 569 int sent = 0; 570 int status; 571 572 xs_pktdump("packet data:", 573 req->rq_svec->iov_base, 574 req->rq_svec->iov_len); 575 576 if (!xprt_bound(xprt)) 577 return -ENOTCONN; 578 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, 579 xdr, req->rq_bytes_sent, true, &sent); 580 581 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 582 xdr->len - req->rq_bytes_sent, status); 583 584 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 585 if (status == -EPERM) 586 goto process_status; 587 588 if (status == -EAGAIN && sock_writeable(transport->inet)) 589 status = -ENOBUFS; 590 591 if (sent > 0 || status == 0) { 592 req->rq_xmit_bytes_sent += sent; 593 if (sent >= req->rq_slen) 594 return 0; 595 /* Still some bytes left; set up for a retry later. */ 596 status = -EAGAIN; 597 } 598 599 process_status: 600 switch (status) { 601 case -ENOTSOCK: 602 status = -ENOTCONN; 603 /* Should we call xs_close() here? */ 604 break; 605 case -EAGAIN: 606 status = xs_nospace(task); 607 break; 608 case -ENETUNREACH: 609 case -ENOBUFS: 610 case -EPIPE: 611 case -ECONNREFUSED: 612 case -EPERM: 613 /* When the server has died, an ICMP port unreachable message 614 * prompts ECONNREFUSED. */ 615 break; 616 default: 617 dprintk("RPC: sendmsg returned unrecognized error %d\n", 618 -status); 619 } 620 621 return status; 622 } 623 624 /** 625 * xs_tcp_send_request - write an RPC request to a TCP socket 626 * @task: address of RPC task that manages the state of an RPC request 627 * 628 * Return values: 629 * 0: The request has been sent 630 * EAGAIN: The socket was blocked, please call again later to 631 * complete the request 632 * ENOTCONN: Caller needs to invoke connect logic then call again 633 * other: Some other error occurred, the request was not sent 634 * 635 * XXX: In the case of soft timeouts, should we eventually give up 636 * if sendmsg is not able to make progress? 637 */ 638 static int xs_tcp_send_request(struct rpc_task *task) 639 { 640 struct rpc_rqst *req = task->tk_rqstp; 641 struct rpc_xprt *xprt = req->rq_xprt; 642 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 643 struct xdr_buf *xdr = &req->rq_snd_buf; 644 bool zerocopy = true; 645 int status; 646 int sent; 647 648 xs_encode_stream_record_marker(&req->rq_snd_buf); 649 650 xs_pktdump("packet data:", 651 req->rq_svec->iov_base, 652 req->rq_svec->iov_len); 653 /* Don't use zero copy if this is a resend. If the RPC call 654 * completes while the socket holds a reference to the pages, 655 * then we may end up resending corrupted data. 656 */ 657 if (task->tk_flags & RPC_TASK_SENT) 658 zerocopy = false; 659 660 /* Continue transmitting the packet/record. We must be careful 661 * to cope with writespace callbacks arriving _after_ we have 662 * called sendmsg(). */ 663 while (1) { 664 sent = 0; 665 status = xs_sendpages(transport->sock, NULL, 0, xdr, 666 req->rq_bytes_sent, zerocopy, &sent); 667 668 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 669 xdr->len - req->rq_bytes_sent, status); 670 671 /* If we've sent the entire packet, immediately 672 * reset the count of bytes sent. */ 673 req->rq_bytes_sent += sent; 674 req->rq_xmit_bytes_sent += sent; 675 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 676 req->rq_bytes_sent = 0; 677 return 0; 678 } 679 680 if (status < 0) 681 break; 682 if (sent == 0) { 683 status = -EAGAIN; 684 break; 685 } 686 } 687 if (status == -EAGAIN && sk_stream_is_writeable(transport->inet)) 688 status = -ENOBUFS; 689 690 switch (status) { 691 case -ENOTSOCK: 692 status = -ENOTCONN; 693 /* Should we call xs_close() here? */ 694 break; 695 case -EAGAIN: 696 status = xs_nospace(task); 697 break; 698 case -ECONNRESET: 699 case -ECONNREFUSED: 700 case -ENOTCONN: 701 case -EADDRINUSE: 702 case -ENOBUFS: 703 case -EPIPE: 704 break; 705 default: 706 dprintk("RPC: sendmsg returned unrecognized error %d\n", 707 -status); 708 } 709 710 return status; 711 } 712 713 /** 714 * xs_tcp_release_xprt - clean up after a tcp transmission 715 * @xprt: transport 716 * @task: rpc task 717 * 718 * This cleans up if an error causes us to abort the transmission of a request. 719 * In this case, the socket may need to be reset in order to avoid confusing 720 * the server. 721 */ 722 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 723 { 724 struct rpc_rqst *req; 725 726 if (task != xprt->snd_task) 727 return; 728 if (task == NULL) 729 goto out_release; 730 req = task->tk_rqstp; 731 if (req == NULL) 732 goto out_release; 733 if (req->rq_bytes_sent == 0) 734 goto out_release; 735 if (req->rq_bytes_sent == req->rq_snd_buf.len) 736 goto out_release; 737 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 738 out_release: 739 xprt_release_xprt(xprt, task); 740 } 741 742 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 743 { 744 transport->old_data_ready = sk->sk_data_ready; 745 transport->old_state_change = sk->sk_state_change; 746 transport->old_write_space = sk->sk_write_space; 747 transport->old_error_report = sk->sk_error_report; 748 } 749 750 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 751 { 752 sk->sk_data_ready = transport->old_data_ready; 753 sk->sk_state_change = transport->old_state_change; 754 sk->sk_write_space = transport->old_write_space; 755 sk->sk_error_report = transport->old_error_report; 756 } 757 758 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 759 { 760 smp_mb__before_atomic(); 761 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 762 clear_bit(XPRT_CLOSING, &xprt->state); 763 smp_mb__after_atomic(); 764 } 765 766 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 767 { 768 xs_sock_reset_connection_flags(xprt); 769 /* Mark transport as closed and wake up all pending tasks */ 770 xprt_disconnect_done(xprt); 771 } 772 773 /** 774 * xs_error_report - callback to handle TCP socket state errors 775 * @sk: socket 776 * 777 * Note: we don't call sock_error() since there may be a rpc_task 778 * using the socket, and so we don't want to clear sk->sk_err. 779 */ 780 static void xs_error_report(struct sock *sk) 781 { 782 struct rpc_xprt *xprt; 783 int err; 784 785 read_lock_bh(&sk->sk_callback_lock); 786 if (!(xprt = xprt_from_sock(sk))) 787 goto out; 788 789 err = -sk->sk_err; 790 if (err == 0) 791 goto out; 792 /* Is this a reset event? */ 793 if (sk->sk_state == TCP_CLOSE) 794 xs_sock_mark_closed(xprt); 795 dprintk("RPC: xs_error_report client %p, error=%d...\n", 796 xprt, -err); 797 trace_rpc_socket_error(xprt, sk->sk_socket, err); 798 xprt_wake_pending_tasks(xprt, err); 799 out: 800 read_unlock_bh(&sk->sk_callback_lock); 801 } 802 803 static void xs_reset_transport(struct sock_xprt *transport) 804 { 805 struct socket *sock = transport->sock; 806 struct sock *sk = transport->inet; 807 struct rpc_xprt *xprt = &transport->xprt; 808 809 if (sk == NULL) 810 return; 811 812 if (atomic_read(&transport->xprt.swapper)) 813 sk_clear_memalloc(sk); 814 815 kernel_sock_shutdown(sock, SHUT_RDWR); 816 817 mutex_lock(&transport->recv_mutex); 818 write_lock_bh(&sk->sk_callback_lock); 819 transport->inet = NULL; 820 transport->sock = NULL; 821 822 sk->sk_user_data = NULL; 823 824 xs_restore_old_callbacks(transport, sk); 825 xprt_clear_connected(xprt); 826 write_unlock_bh(&sk->sk_callback_lock); 827 xs_sock_reset_connection_flags(xprt); 828 mutex_unlock(&transport->recv_mutex); 829 830 trace_rpc_socket_close(xprt, sock); 831 sock_release(sock); 832 } 833 834 /** 835 * xs_close - close a socket 836 * @xprt: transport 837 * 838 * This is used when all requests are complete; ie, no DRC state remains 839 * on the server we want to save. 840 * 841 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 842 * xs_reset_transport() zeroing the socket from underneath a writer. 843 */ 844 static void xs_close(struct rpc_xprt *xprt) 845 { 846 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 847 848 dprintk("RPC: xs_close xprt %p\n", xprt); 849 850 xs_reset_transport(transport); 851 xprt->reestablish_timeout = 0; 852 853 xprt_disconnect_done(xprt); 854 } 855 856 static void xs_inject_disconnect(struct rpc_xprt *xprt) 857 { 858 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 859 xprt); 860 xprt_disconnect_done(xprt); 861 } 862 863 static void xs_xprt_free(struct rpc_xprt *xprt) 864 { 865 xs_free_peer_addresses(xprt); 866 xprt_free(xprt); 867 } 868 869 /** 870 * xs_destroy - prepare to shutdown a transport 871 * @xprt: doomed transport 872 * 873 */ 874 static void xs_destroy(struct rpc_xprt *xprt) 875 { 876 struct sock_xprt *transport = container_of(xprt, 877 struct sock_xprt, xprt); 878 dprintk("RPC: xs_destroy xprt %p\n", xprt); 879 880 cancel_delayed_work_sync(&transport->connect_worker); 881 xs_close(xprt); 882 cancel_work_sync(&transport->recv_worker); 883 xs_xprt_free(xprt); 884 module_put(THIS_MODULE); 885 } 886 887 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 888 { 889 struct xdr_skb_reader desc = { 890 .skb = skb, 891 .offset = sizeof(rpc_fraghdr), 892 .count = skb->len - sizeof(rpc_fraghdr), 893 }; 894 895 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 896 return -1; 897 if (desc.count) 898 return -1; 899 return 0; 900 } 901 902 /** 903 * xs_local_data_read_skb 904 * @xprt: transport 905 * @sk: socket 906 * @skb: skbuff 907 * 908 * Currently this assumes we can read the whole reply in a single gulp. 909 */ 910 static void xs_local_data_read_skb(struct rpc_xprt *xprt, 911 struct sock *sk, 912 struct sk_buff *skb) 913 { 914 struct rpc_task *task; 915 struct rpc_rqst *rovr; 916 int repsize, copied; 917 u32 _xid; 918 __be32 *xp; 919 920 repsize = skb->len - sizeof(rpc_fraghdr); 921 if (repsize < 4) { 922 dprintk("RPC: impossible RPC reply size %d\n", repsize); 923 return; 924 } 925 926 /* Copy the XID from the skb... */ 927 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 928 if (xp == NULL) 929 return; 930 931 /* Look up and lock the request corresponding to the given XID */ 932 spin_lock_bh(&xprt->transport_lock); 933 rovr = xprt_lookup_rqst(xprt, *xp); 934 if (!rovr) 935 goto out_unlock; 936 task = rovr->rq_task; 937 938 copied = rovr->rq_private_buf.buflen; 939 if (copied > repsize) 940 copied = repsize; 941 942 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 943 dprintk("RPC: sk_buff copy failed\n"); 944 goto out_unlock; 945 } 946 947 xprt_complete_rqst(task, copied); 948 949 out_unlock: 950 spin_unlock_bh(&xprt->transport_lock); 951 } 952 953 static void xs_local_data_receive(struct sock_xprt *transport) 954 { 955 struct sk_buff *skb; 956 struct sock *sk; 957 int err; 958 959 mutex_lock(&transport->recv_mutex); 960 sk = transport->inet; 961 if (sk == NULL) 962 goto out; 963 for (;;) { 964 skb = skb_recv_datagram(sk, 0, 1, &err); 965 if (skb == NULL) 966 break; 967 xs_local_data_read_skb(&transport->xprt, sk, skb); 968 skb_free_datagram(sk, skb); 969 } 970 out: 971 mutex_unlock(&transport->recv_mutex); 972 } 973 974 static void xs_local_data_receive_workfn(struct work_struct *work) 975 { 976 struct sock_xprt *transport = 977 container_of(work, struct sock_xprt, recv_worker); 978 xs_local_data_receive(transport); 979 } 980 981 /** 982 * xs_udp_data_read_skb - receive callback for UDP sockets 983 * @xprt: transport 984 * @sk: socket 985 * @skb: skbuff 986 * 987 */ 988 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 989 struct sock *sk, 990 struct sk_buff *skb) 991 { 992 struct rpc_task *task; 993 struct rpc_rqst *rovr; 994 int repsize, copied; 995 u32 _xid; 996 __be32 *xp; 997 998 repsize = skb->len; 999 if (repsize < 4) { 1000 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1001 return; 1002 } 1003 1004 /* Copy the XID from the skb... */ 1005 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1006 if (xp == NULL) 1007 return; 1008 1009 /* Look up and lock the request corresponding to the given XID */ 1010 spin_lock_bh(&xprt->transport_lock); 1011 rovr = xprt_lookup_rqst(xprt, *xp); 1012 if (!rovr) 1013 goto out_unlock; 1014 task = rovr->rq_task; 1015 1016 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1017 copied = repsize; 1018 1019 /* Suck it into the iovec, verify checksum if not done by hw. */ 1020 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1021 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1022 goto out_unlock; 1023 } 1024 1025 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1026 1027 xprt_adjust_cwnd(xprt, task, copied); 1028 xprt_complete_rqst(task, copied); 1029 1030 out_unlock: 1031 spin_unlock_bh(&xprt->transport_lock); 1032 } 1033 1034 static void xs_udp_data_receive(struct sock_xprt *transport) 1035 { 1036 struct sk_buff *skb; 1037 struct sock *sk; 1038 int err; 1039 1040 mutex_lock(&transport->recv_mutex); 1041 sk = transport->inet; 1042 if (sk == NULL) 1043 goto out; 1044 for (;;) { 1045 skb = skb_recv_datagram(sk, 0, 1, &err); 1046 if (skb == NULL) 1047 break; 1048 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1049 skb_free_datagram(sk, skb); 1050 } 1051 out: 1052 mutex_unlock(&transport->recv_mutex); 1053 } 1054 1055 static void xs_udp_data_receive_workfn(struct work_struct *work) 1056 { 1057 struct sock_xprt *transport = 1058 container_of(work, struct sock_xprt, recv_worker); 1059 xs_udp_data_receive(transport); 1060 } 1061 1062 /** 1063 * xs_data_ready - "data ready" callback for UDP sockets 1064 * @sk: socket with data to read 1065 * 1066 */ 1067 static void xs_data_ready(struct sock *sk) 1068 { 1069 struct rpc_xprt *xprt; 1070 1071 read_lock_bh(&sk->sk_callback_lock); 1072 dprintk("RPC: xs_data_ready...\n"); 1073 xprt = xprt_from_sock(sk); 1074 if (xprt != NULL) { 1075 struct sock_xprt *transport = container_of(xprt, 1076 struct sock_xprt, xprt); 1077 queue_work(rpciod_workqueue, &transport->recv_worker); 1078 } 1079 read_unlock_bh(&sk->sk_callback_lock); 1080 } 1081 1082 /* 1083 * Helper function to force a TCP close if the server is sending 1084 * junk and/or it has put us in CLOSE_WAIT 1085 */ 1086 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1087 { 1088 xprt_force_disconnect(xprt); 1089 } 1090 1091 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1092 { 1093 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1094 size_t len, used; 1095 char *p; 1096 1097 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1098 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1099 used = xdr_skb_read_bits(desc, p, len); 1100 transport->tcp_offset += used; 1101 if (used != len) 1102 return; 1103 1104 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1105 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1106 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1107 else 1108 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1109 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1110 1111 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1112 transport->tcp_offset = 0; 1113 1114 /* Sanity check of the record length */ 1115 if (unlikely(transport->tcp_reclen < 8)) { 1116 dprintk("RPC: invalid TCP record fragment length\n"); 1117 xs_tcp_force_close(xprt); 1118 return; 1119 } 1120 dprintk("RPC: reading TCP record fragment of length %d\n", 1121 transport->tcp_reclen); 1122 } 1123 1124 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1125 { 1126 if (transport->tcp_offset == transport->tcp_reclen) { 1127 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1128 transport->tcp_offset = 0; 1129 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1130 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1131 transport->tcp_flags |= TCP_RCV_COPY_XID; 1132 transport->tcp_copied = 0; 1133 } 1134 } 1135 } 1136 1137 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1138 { 1139 size_t len, used; 1140 char *p; 1141 1142 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1143 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1144 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1145 used = xdr_skb_read_bits(desc, p, len); 1146 transport->tcp_offset += used; 1147 if (used != len) 1148 return; 1149 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1150 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1151 transport->tcp_copied = 4; 1152 dprintk("RPC: reading %s XID %08x\n", 1153 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1154 : "request with", 1155 ntohl(transport->tcp_xid)); 1156 xs_tcp_check_fraghdr(transport); 1157 } 1158 1159 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1160 struct xdr_skb_reader *desc) 1161 { 1162 size_t len, used; 1163 u32 offset; 1164 char *p; 1165 1166 /* 1167 * We want transport->tcp_offset to be 8 at the end of this routine 1168 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1169 * When this function is called for the first time, 1170 * transport->tcp_offset is 4 (after having already read the xid). 1171 */ 1172 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1173 len = sizeof(transport->tcp_calldir) - offset; 1174 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1175 p = ((char *) &transport->tcp_calldir) + offset; 1176 used = xdr_skb_read_bits(desc, p, len); 1177 transport->tcp_offset += used; 1178 if (used != len) 1179 return; 1180 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1181 /* 1182 * We don't yet have the XDR buffer, so we will write the calldir 1183 * out after we get the buffer from the 'struct rpc_rqst' 1184 */ 1185 switch (ntohl(transport->tcp_calldir)) { 1186 case RPC_REPLY: 1187 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1188 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1189 transport->tcp_flags |= TCP_RPC_REPLY; 1190 break; 1191 case RPC_CALL: 1192 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1193 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1194 transport->tcp_flags &= ~TCP_RPC_REPLY; 1195 break; 1196 default: 1197 dprintk("RPC: invalid request message type\n"); 1198 xs_tcp_force_close(&transport->xprt); 1199 } 1200 xs_tcp_check_fraghdr(transport); 1201 } 1202 1203 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1204 struct xdr_skb_reader *desc, 1205 struct rpc_rqst *req) 1206 { 1207 struct sock_xprt *transport = 1208 container_of(xprt, struct sock_xprt, xprt); 1209 struct xdr_buf *rcvbuf; 1210 size_t len; 1211 ssize_t r; 1212 1213 rcvbuf = &req->rq_private_buf; 1214 1215 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1216 /* 1217 * Save the RPC direction in the XDR buffer 1218 */ 1219 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1220 &transport->tcp_calldir, 1221 sizeof(transport->tcp_calldir)); 1222 transport->tcp_copied += sizeof(transport->tcp_calldir); 1223 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1224 } 1225 1226 len = desc->count; 1227 if (len > transport->tcp_reclen - transport->tcp_offset) { 1228 struct xdr_skb_reader my_desc; 1229 1230 len = transport->tcp_reclen - transport->tcp_offset; 1231 memcpy(&my_desc, desc, sizeof(my_desc)); 1232 my_desc.count = len; 1233 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1234 &my_desc, xdr_skb_read_bits); 1235 desc->count -= r; 1236 desc->offset += r; 1237 } else 1238 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1239 desc, xdr_skb_read_bits); 1240 1241 if (r > 0) { 1242 transport->tcp_copied += r; 1243 transport->tcp_offset += r; 1244 } 1245 if (r != len) { 1246 /* Error when copying to the receive buffer, 1247 * usually because we weren't able to allocate 1248 * additional buffer pages. All we can do now 1249 * is turn off TCP_RCV_COPY_DATA, so the request 1250 * will not receive any additional updates, 1251 * and time out. 1252 * Any remaining data from this record will 1253 * be discarded. 1254 */ 1255 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1256 dprintk("RPC: XID %08x truncated request\n", 1257 ntohl(transport->tcp_xid)); 1258 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1259 "tcp_offset = %u, tcp_reclen = %u\n", 1260 xprt, transport->tcp_copied, 1261 transport->tcp_offset, transport->tcp_reclen); 1262 return; 1263 } 1264 1265 dprintk("RPC: XID %08x read %Zd bytes\n", 1266 ntohl(transport->tcp_xid), r); 1267 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1268 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1269 transport->tcp_offset, transport->tcp_reclen); 1270 1271 if (transport->tcp_copied == req->rq_private_buf.buflen) 1272 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1273 else if (transport->tcp_offset == transport->tcp_reclen) { 1274 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1275 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1276 } 1277 } 1278 1279 /* 1280 * Finds the request corresponding to the RPC xid and invokes the common 1281 * tcp read code to read the data. 1282 */ 1283 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1284 struct xdr_skb_reader *desc) 1285 { 1286 struct sock_xprt *transport = 1287 container_of(xprt, struct sock_xprt, xprt); 1288 struct rpc_rqst *req; 1289 1290 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1291 1292 /* Find and lock the request corresponding to this xid */ 1293 spin_lock_bh(&xprt->transport_lock); 1294 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1295 if (!req) { 1296 dprintk("RPC: XID %08x request not found!\n", 1297 ntohl(transport->tcp_xid)); 1298 spin_unlock_bh(&xprt->transport_lock); 1299 return -1; 1300 } 1301 1302 xs_tcp_read_common(xprt, desc, req); 1303 1304 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1305 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1306 1307 spin_unlock_bh(&xprt->transport_lock); 1308 return 0; 1309 } 1310 1311 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1312 /* 1313 * Obtains an rpc_rqst previously allocated and invokes the common 1314 * tcp read code to read the data. The result is placed in the callback 1315 * queue. 1316 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1317 * connection and return -1. 1318 */ 1319 static int xs_tcp_read_callback(struct rpc_xprt *xprt, 1320 struct xdr_skb_reader *desc) 1321 { 1322 struct sock_xprt *transport = 1323 container_of(xprt, struct sock_xprt, xprt); 1324 struct rpc_rqst *req; 1325 1326 /* Look up and lock the request corresponding to the given XID */ 1327 spin_lock_bh(&xprt->transport_lock); 1328 req = xprt_lookup_bc_request(xprt, transport->tcp_xid); 1329 if (req == NULL) { 1330 spin_unlock_bh(&xprt->transport_lock); 1331 printk(KERN_WARNING "Callback slot table overflowed\n"); 1332 xprt_force_disconnect(xprt); 1333 return -1; 1334 } 1335 1336 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1337 xs_tcp_read_common(xprt, desc, req); 1338 1339 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1340 xprt_complete_bc_request(req, transport->tcp_copied); 1341 spin_unlock_bh(&xprt->transport_lock); 1342 1343 return 0; 1344 } 1345 1346 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1347 struct xdr_skb_reader *desc) 1348 { 1349 struct sock_xprt *transport = 1350 container_of(xprt, struct sock_xprt, xprt); 1351 1352 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1353 xs_tcp_read_reply(xprt, desc) : 1354 xs_tcp_read_callback(xprt, desc); 1355 } 1356 1357 static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net) 1358 { 1359 int ret; 1360 1361 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0, 1362 SVC_SOCK_ANONYMOUS); 1363 if (ret < 0) 1364 return ret; 1365 return 0; 1366 } 1367 #else 1368 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1369 struct xdr_skb_reader *desc) 1370 { 1371 return xs_tcp_read_reply(xprt, desc); 1372 } 1373 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1374 1375 /* 1376 * Read data off the transport. This can be either an RPC_CALL or an 1377 * RPC_REPLY. Relay the processing to helper functions. 1378 */ 1379 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1380 struct xdr_skb_reader *desc) 1381 { 1382 struct sock_xprt *transport = 1383 container_of(xprt, struct sock_xprt, xprt); 1384 1385 if (_xs_tcp_read_data(xprt, desc) == 0) 1386 xs_tcp_check_fraghdr(transport); 1387 else { 1388 /* 1389 * The transport_lock protects the request handling. 1390 * There's no need to hold it to update the tcp_flags. 1391 */ 1392 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1393 } 1394 } 1395 1396 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1397 { 1398 size_t len; 1399 1400 len = transport->tcp_reclen - transport->tcp_offset; 1401 if (len > desc->count) 1402 len = desc->count; 1403 desc->count -= len; 1404 desc->offset += len; 1405 transport->tcp_offset += len; 1406 dprintk("RPC: discarded %Zu bytes\n", len); 1407 xs_tcp_check_fraghdr(transport); 1408 } 1409 1410 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1411 { 1412 struct rpc_xprt *xprt = rd_desc->arg.data; 1413 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1414 struct xdr_skb_reader desc = { 1415 .skb = skb, 1416 .offset = offset, 1417 .count = len, 1418 }; 1419 1420 dprintk("RPC: xs_tcp_data_recv started\n"); 1421 do { 1422 trace_xs_tcp_data_recv(transport); 1423 /* Read in a new fragment marker if necessary */ 1424 /* Can we ever really expect to get completely empty fragments? */ 1425 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1426 xs_tcp_read_fraghdr(xprt, &desc); 1427 continue; 1428 } 1429 /* Read in the xid if necessary */ 1430 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1431 xs_tcp_read_xid(transport, &desc); 1432 continue; 1433 } 1434 /* Read in the call/reply flag */ 1435 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1436 xs_tcp_read_calldir(transport, &desc); 1437 continue; 1438 } 1439 /* Read in the request data */ 1440 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1441 xs_tcp_read_data(xprt, &desc); 1442 continue; 1443 } 1444 /* Skip over any trailing bytes on short reads */ 1445 xs_tcp_read_discard(transport, &desc); 1446 } while (desc.count); 1447 trace_xs_tcp_data_recv(transport); 1448 dprintk("RPC: xs_tcp_data_recv done\n"); 1449 return len - desc.count; 1450 } 1451 1452 static void xs_tcp_data_receive(struct sock_xprt *transport) 1453 { 1454 struct rpc_xprt *xprt = &transport->xprt; 1455 struct sock *sk; 1456 read_descriptor_t rd_desc = { 1457 .count = 2*1024*1024, 1458 .arg.data = xprt, 1459 }; 1460 unsigned long total = 0; 1461 int read = 0; 1462 1463 mutex_lock(&transport->recv_mutex); 1464 sk = transport->inet; 1465 if (sk == NULL) 1466 goto out; 1467 1468 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1469 for (;;) { 1470 lock_sock(sk); 1471 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1472 release_sock(sk); 1473 if (read <= 0) 1474 break; 1475 total += read; 1476 rd_desc.count = 65536; 1477 } 1478 out: 1479 mutex_unlock(&transport->recv_mutex); 1480 trace_xs_tcp_data_ready(xprt, read, total); 1481 } 1482 1483 static void xs_tcp_data_receive_workfn(struct work_struct *work) 1484 { 1485 struct sock_xprt *transport = 1486 container_of(work, struct sock_xprt, recv_worker); 1487 xs_tcp_data_receive(transport); 1488 } 1489 1490 /** 1491 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1492 * @sk: socket with data to read 1493 * 1494 */ 1495 static void xs_tcp_data_ready(struct sock *sk) 1496 { 1497 struct sock_xprt *transport; 1498 struct rpc_xprt *xprt; 1499 1500 dprintk("RPC: xs_tcp_data_ready...\n"); 1501 1502 read_lock_bh(&sk->sk_callback_lock); 1503 if (!(xprt = xprt_from_sock(sk))) 1504 goto out; 1505 transport = container_of(xprt, struct sock_xprt, xprt); 1506 1507 /* Any data means we had a useful conversation, so 1508 * the we don't need to delay the next reconnect 1509 */ 1510 if (xprt->reestablish_timeout) 1511 xprt->reestablish_timeout = 0; 1512 queue_work(rpciod_workqueue, &transport->recv_worker); 1513 1514 out: 1515 read_unlock_bh(&sk->sk_callback_lock); 1516 } 1517 1518 /** 1519 * xs_tcp_state_change - callback to handle TCP socket state changes 1520 * @sk: socket whose state has changed 1521 * 1522 */ 1523 static void xs_tcp_state_change(struct sock *sk) 1524 { 1525 struct rpc_xprt *xprt; 1526 struct sock_xprt *transport; 1527 1528 read_lock_bh(&sk->sk_callback_lock); 1529 if (!(xprt = xprt_from_sock(sk))) 1530 goto out; 1531 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1532 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1533 sk->sk_state, xprt_connected(xprt), 1534 sock_flag(sk, SOCK_DEAD), 1535 sock_flag(sk, SOCK_ZAPPED), 1536 sk->sk_shutdown); 1537 1538 transport = container_of(xprt, struct sock_xprt, xprt); 1539 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1540 switch (sk->sk_state) { 1541 case TCP_ESTABLISHED: 1542 spin_lock(&xprt->transport_lock); 1543 if (!xprt_test_and_set_connected(xprt)) { 1544 1545 /* Reset TCP record info */ 1546 transport->tcp_offset = 0; 1547 transport->tcp_reclen = 0; 1548 transport->tcp_copied = 0; 1549 transport->tcp_flags = 1550 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1551 xprt->connect_cookie++; 1552 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1553 xprt_clear_connecting(xprt); 1554 1555 xprt_wake_pending_tasks(xprt, -EAGAIN); 1556 } 1557 spin_unlock(&xprt->transport_lock); 1558 break; 1559 case TCP_FIN_WAIT1: 1560 /* The client initiated a shutdown of the socket */ 1561 xprt->connect_cookie++; 1562 xprt->reestablish_timeout = 0; 1563 set_bit(XPRT_CLOSING, &xprt->state); 1564 smp_mb__before_atomic(); 1565 clear_bit(XPRT_CONNECTED, &xprt->state); 1566 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1567 smp_mb__after_atomic(); 1568 break; 1569 case TCP_CLOSE_WAIT: 1570 /* The server initiated a shutdown of the socket */ 1571 xprt->connect_cookie++; 1572 clear_bit(XPRT_CONNECTED, &xprt->state); 1573 xs_tcp_force_close(xprt); 1574 case TCP_CLOSING: 1575 /* 1576 * If the server closed down the connection, make sure that 1577 * we back off before reconnecting 1578 */ 1579 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1580 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1581 break; 1582 case TCP_LAST_ACK: 1583 set_bit(XPRT_CLOSING, &xprt->state); 1584 smp_mb__before_atomic(); 1585 clear_bit(XPRT_CONNECTED, &xprt->state); 1586 smp_mb__after_atomic(); 1587 break; 1588 case TCP_CLOSE: 1589 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1590 &transport->sock_state)) 1591 xprt_clear_connecting(xprt); 1592 xs_sock_mark_closed(xprt); 1593 } 1594 out: 1595 read_unlock_bh(&sk->sk_callback_lock); 1596 } 1597 1598 static void xs_write_space(struct sock *sk) 1599 { 1600 struct socket_wq *wq; 1601 struct rpc_xprt *xprt; 1602 1603 if (!sk->sk_socket) 1604 return; 1605 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1606 1607 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1608 return; 1609 rcu_read_lock(); 1610 wq = rcu_dereference(sk->sk_wq); 1611 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) 1612 goto out; 1613 1614 xprt_write_space(xprt); 1615 out: 1616 rcu_read_unlock(); 1617 } 1618 1619 /** 1620 * xs_udp_write_space - callback invoked when socket buffer space 1621 * becomes available 1622 * @sk: socket whose state has changed 1623 * 1624 * Called when more output buffer space is available for this socket. 1625 * We try not to wake our writers until they can make "significant" 1626 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1627 * with a bunch of small requests. 1628 */ 1629 static void xs_udp_write_space(struct sock *sk) 1630 { 1631 read_lock_bh(&sk->sk_callback_lock); 1632 1633 /* from net/core/sock.c:sock_def_write_space */ 1634 if (sock_writeable(sk)) 1635 xs_write_space(sk); 1636 1637 read_unlock_bh(&sk->sk_callback_lock); 1638 } 1639 1640 /** 1641 * xs_tcp_write_space - callback invoked when socket buffer space 1642 * becomes available 1643 * @sk: socket whose state has changed 1644 * 1645 * Called when more output buffer space is available for this socket. 1646 * We try not to wake our writers until they can make "significant" 1647 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1648 * with a bunch of small requests. 1649 */ 1650 static void xs_tcp_write_space(struct sock *sk) 1651 { 1652 read_lock_bh(&sk->sk_callback_lock); 1653 1654 /* from net/core/stream.c:sk_stream_write_space */ 1655 if (sk_stream_is_writeable(sk)) 1656 xs_write_space(sk); 1657 1658 read_unlock_bh(&sk->sk_callback_lock); 1659 } 1660 1661 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1662 { 1663 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1664 struct sock *sk = transport->inet; 1665 1666 if (transport->rcvsize) { 1667 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1668 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1669 } 1670 if (transport->sndsize) { 1671 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1672 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1673 sk->sk_write_space(sk); 1674 } 1675 } 1676 1677 /** 1678 * xs_udp_set_buffer_size - set send and receive limits 1679 * @xprt: generic transport 1680 * @sndsize: requested size of send buffer, in bytes 1681 * @rcvsize: requested size of receive buffer, in bytes 1682 * 1683 * Set socket send and receive buffer size limits. 1684 */ 1685 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1686 { 1687 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1688 1689 transport->sndsize = 0; 1690 if (sndsize) 1691 transport->sndsize = sndsize + 1024; 1692 transport->rcvsize = 0; 1693 if (rcvsize) 1694 transport->rcvsize = rcvsize + 1024; 1695 1696 xs_udp_do_set_buffer_size(xprt); 1697 } 1698 1699 /** 1700 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1701 * @task: task that timed out 1702 * 1703 * Adjust the congestion window after a retransmit timeout has occurred. 1704 */ 1705 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1706 { 1707 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1708 } 1709 1710 static unsigned short xs_get_random_port(void) 1711 { 1712 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1713 unsigned short rand = (unsigned short) prandom_u32() % range; 1714 return rand + xprt_min_resvport; 1715 } 1716 1717 /** 1718 * xs_set_reuseaddr_port - set the socket's port and address reuse options 1719 * @sock: socket 1720 * 1721 * Note that this function has to be called on all sockets that share the 1722 * same port, and it must be called before binding. 1723 */ 1724 static void xs_sock_set_reuseport(struct socket *sock) 1725 { 1726 int opt = 1; 1727 1728 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, 1729 (char *)&opt, sizeof(opt)); 1730 } 1731 1732 static unsigned short xs_sock_getport(struct socket *sock) 1733 { 1734 struct sockaddr_storage buf; 1735 int buflen; 1736 unsigned short port = 0; 1737 1738 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0) 1739 goto out; 1740 switch (buf.ss_family) { 1741 case AF_INET6: 1742 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1743 break; 1744 case AF_INET: 1745 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1746 } 1747 out: 1748 return port; 1749 } 1750 1751 /** 1752 * xs_set_port - reset the port number in the remote endpoint address 1753 * @xprt: generic transport 1754 * @port: new port number 1755 * 1756 */ 1757 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1758 { 1759 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1760 1761 rpc_set_port(xs_addr(xprt), port); 1762 xs_update_peer_port(xprt); 1763 } 1764 1765 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1766 { 1767 if (transport->srcport == 0) 1768 transport->srcport = xs_sock_getport(sock); 1769 } 1770 1771 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1772 { 1773 unsigned short port = transport->srcport; 1774 1775 if (port == 0 && transport->xprt.resvport) 1776 port = xs_get_random_port(); 1777 return port; 1778 } 1779 1780 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1781 { 1782 if (transport->srcport != 0) 1783 transport->srcport = 0; 1784 if (!transport->xprt.resvport) 1785 return 0; 1786 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1787 return xprt_max_resvport; 1788 return --port; 1789 } 1790 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1791 { 1792 struct sockaddr_storage myaddr; 1793 int err, nloop = 0; 1794 unsigned short port = xs_get_srcport(transport); 1795 unsigned short last; 1796 1797 /* 1798 * If we are asking for any ephemeral port (i.e. port == 0 && 1799 * transport->xprt.resvport == 0), don't bind. Let the local 1800 * port selection happen implicitly when the socket is used 1801 * (for example at connect time). 1802 * 1803 * This ensures that we can continue to establish TCP 1804 * connections even when all local ephemeral ports are already 1805 * a part of some TCP connection. This makes no difference 1806 * for UDP sockets, but also doens't harm them. 1807 * 1808 * If we're asking for any reserved port (i.e. port == 0 && 1809 * transport->xprt.resvport == 1) xs_get_srcport above will 1810 * ensure that port is non-zero and we will bind as needed. 1811 */ 1812 if (port == 0) 1813 return 0; 1814 1815 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1816 do { 1817 rpc_set_port((struct sockaddr *)&myaddr, port); 1818 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1819 transport->xprt.addrlen); 1820 if (err == 0) { 1821 transport->srcport = port; 1822 break; 1823 } 1824 last = port; 1825 port = xs_next_srcport(transport, port); 1826 if (port > last) 1827 nloop++; 1828 } while (err == -EADDRINUSE && nloop != 2); 1829 1830 if (myaddr.ss_family == AF_INET) 1831 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1832 &((struct sockaddr_in *)&myaddr)->sin_addr, 1833 port, err ? "failed" : "ok", err); 1834 else 1835 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1836 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1837 port, err ? "failed" : "ok", err); 1838 return err; 1839 } 1840 1841 /* 1842 * We don't support autobind on AF_LOCAL sockets 1843 */ 1844 static void xs_local_rpcbind(struct rpc_task *task) 1845 { 1846 xprt_set_bound(task->tk_xprt); 1847 } 1848 1849 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1850 { 1851 } 1852 1853 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1854 static struct lock_class_key xs_key[2]; 1855 static struct lock_class_key xs_slock_key[2]; 1856 1857 static inline void xs_reclassify_socketu(struct socket *sock) 1858 { 1859 struct sock *sk = sock->sk; 1860 1861 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1862 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1863 } 1864 1865 static inline void xs_reclassify_socket4(struct socket *sock) 1866 { 1867 struct sock *sk = sock->sk; 1868 1869 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1870 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1871 } 1872 1873 static inline void xs_reclassify_socket6(struct socket *sock) 1874 { 1875 struct sock *sk = sock->sk; 1876 1877 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1878 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1879 } 1880 1881 static inline void xs_reclassify_socket(int family, struct socket *sock) 1882 { 1883 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1884 return; 1885 1886 switch (family) { 1887 case AF_LOCAL: 1888 xs_reclassify_socketu(sock); 1889 break; 1890 case AF_INET: 1891 xs_reclassify_socket4(sock); 1892 break; 1893 case AF_INET6: 1894 xs_reclassify_socket6(sock); 1895 break; 1896 } 1897 } 1898 #else 1899 static inline void xs_reclassify_socket(int family, struct socket *sock) 1900 { 1901 } 1902 #endif 1903 1904 static void xs_dummy_setup_socket(struct work_struct *work) 1905 { 1906 } 1907 1908 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1909 struct sock_xprt *transport, int family, int type, 1910 int protocol, bool reuseport) 1911 { 1912 struct socket *sock; 1913 int err; 1914 1915 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1916 if (err < 0) { 1917 dprintk("RPC: can't create %d transport socket (%d).\n", 1918 protocol, -err); 1919 goto out; 1920 } 1921 xs_reclassify_socket(family, sock); 1922 1923 if (reuseport) 1924 xs_sock_set_reuseport(sock); 1925 1926 err = xs_bind(transport, sock); 1927 if (err) { 1928 sock_release(sock); 1929 goto out; 1930 } 1931 1932 return sock; 1933 out: 1934 return ERR_PTR(err); 1935 } 1936 1937 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1938 struct socket *sock) 1939 { 1940 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1941 xprt); 1942 1943 if (!transport->inet) { 1944 struct sock *sk = sock->sk; 1945 1946 write_lock_bh(&sk->sk_callback_lock); 1947 1948 xs_save_old_callbacks(transport, sk); 1949 1950 sk->sk_user_data = xprt; 1951 sk->sk_data_ready = xs_data_ready; 1952 sk->sk_write_space = xs_udp_write_space; 1953 sock_set_flag(sk, SOCK_FASYNC); 1954 sk->sk_error_report = xs_error_report; 1955 sk->sk_allocation = GFP_NOIO; 1956 1957 xprt_clear_connected(xprt); 1958 1959 /* Reset to new socket */ 1960 transport->sock = sock; 1961 transport->inet = sk; 1962 1963 write_unlock_bh(&sk->sk_callback_lock); 1964 } 1965 1966 /* Tell the socket layer to start connecting... */ 1967 xprt->stat.connect_count++; 1968 xprt->stat.connect_start = jiffies; 1969 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1970 } 1971 1972 /** 1973 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1974 * @transport: socket transport to connect 1975 */ 1976 static int xs_local_setup_socket(struct sock_xprt *transport) 1977 { 1978 struct rpc_xprt *xprt = &transport->xprt; 1979 struct socket *sock; 1980 int status = -EIO; 1981 1982 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1983 SOCK_STREAM, 0, &sock, 1); 1984 if (status < 0) { 1985 dprintk("RPC: can't create AF_LOCAL " 1986 "transport socket (%d).\n", -status); 1987 goto out; 1988 } 1989 xs_reclassify_socket(AF_LOCAL, sock); 1990 1991 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1992 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1993 1994 status = xs_local_finish_connecting(xprt, sock); 1995 trace_rpc_socket_connect(xprt, sock, status); 1996 switch (status) { 1997 case 0: 1998 dprintk("RPC: xprt %p connected to %s\n", 1999 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2000 xprt_set_connected(xprt); 2001 case -ENOBUFS: 2002 break; 2003 case -ENOENT: 2004 dprintk("RPC: xprt %p: socket %s does not exist\n", 2005 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2006 break; 2007 case -ECONNREFUSED: 2008 dprintk("RPC: xprt %p: connection refused for %s\n", 2009 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2010 break; 2011 default: 2012 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 2013 __func__, -status, 2014 xprt->address_strings[RPC_DISPLAY_ADDR]); 2015 } 2016 2017 out: 2018 xprt_clear_connecting(xprt); 2019 xprt_wake_pending_tasks(xprt, status); 2020 return status; 2021 } 2022 2023 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2024 { 2025 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2026 int ret; 2027 2028 if (RPC_IS_ASYNC(task)) { 2029 /* 2030 * We want the AF_LOCAL connect to be resolved in the 2031 * filesystem namespace of the process making the rpc 2032 * call. Thus we connect synchronously. 2033 * 2034 * If we want to support asynchronous AF_LOCAL calls, 2035 * we'll need to figure out how to pass a namespace to 2036 * connect. 2037 */ 2038 rpc_exit(task, -ENOTCONN); 2039 return; 2040 } 2041 ret = xs_local_setup_socket(transport); 2042 if (ret && !RPC_IS_SOFTCONN(task)) 2043 msleep_interruptible(15000); 2044 } 2045 2046 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 2047 /* 2048 * Note that this should be called with XPRT_LOCKED held (or when we otherwise 2049 * know that we have exclusive access to the socket), to guard against 2050 * races with xs_reset_transport. 2051 */ 2052 static void xs_set_memalloc(struct rpc_xprt *xprt) 2053 { 2054 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2055 xprt); 2056 2057 /* 2058 * If there's no sock, then we have nothing to set. The 2059 * reconnecting process will get it for us. 2060 */ 2061 if (!transport->inet) 2062 return; 2063 if (atomic_read(&xprt->swapper)) 2064 sk_set_memalloc(transport->inet); 2065 } 2066 2067 /** 2068 * xs_enable_swap - Tag this transport as being used for swap. 2069 * @xprt: transport to tag 2070 * 2071 * Take a reference to this transport on behalf of the rpc_clnt, and 2072 * optionally mark it for swapping if it wasn't already. 2073 */ 2074 static int 2075 xs_enable_swap(struct rpc_xprt *xprt) 2076 { 2077 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2078 2079 if (atomic_inc_return(&xprt->swapper) != 1) 2080 return 0; 2081 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2082 return -ERESTARTSYS; 2083 if (xs->inet) 2084 sk_set_memalloc(xs->inet); 2085 xprt_release_xprt(xprt, NULL); 2086 return 0; 2087 } 2088 2089 /** 2090 * xs_disable_swap - Untag this transport as being used for swap. 2091 * @xprt: transport to tag 2092 * 2093 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2094 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2095 */ 2096 static void 2097 xs_disable_swap(struct rpc_xprt *xprt) 2098 { 2099 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2100 2101 if (!atomic_dec_and_test(&xprt->swapper)) 2102 return; 2103 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2104 return; 2105 if (xs->inet) 2106 sk_clear_memalloc(xs->inet); 2107 xprt_release_xprt(xprt, NULL); 2108 } 2109 #else 2110 static void xs_set_memalloc(struct rpc_xprt *xprt) 2111 { 2112 } 2113 2114 static int 2115 xs_enable_swap(struct rpc_xprt *xprt) 2116 { 2117 return -EINVAL; 2118 } 2119 2120 static void 2121 xs_disable_swap(struct rpc_xprt *xprt) 2122 { 2123 } 2124 #endif 2125 2126 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2127 { 2128 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2129 2130 if (!transport->inet) { 2131 struct sock *sk = sock->sk; 2132 2133 write_lock_bh(&sk->sk_callback_lock); 2134 2135 xs_save_old_callbacks(transport, sk); 2136 2137 sk->sk_user_data = xprt; 2138 sk->sk_data_ready = xs_data_ready; 2139 sk->sk_write_space = xs_udp_write_space; 2140 sock_set_flag(sk, SOCK_FASYNC); 2141 sk->sk_allocation = GFP_NOIO; 2142 2143 xprt_set_connected(xprt); 2144 2145 /* Reset to new socket */ 2146 transport->sock = sock; 2147 transport->inet = sk; 2148 2149 xs_set_memalloc(xprt); 2150 2151 write_unlock_bh(&sk->sk_callback_lock); 2152 } 2153 xs_udp_do_set_buffer_size(xprt); 2154 } 2155 2156 static void xs_udp_setup_socket(struct work_struct *work) 2157 { 2158 struct sock_xprt *transport = 2159 container_of(work, struct sock_xprt, connect_worker.work); 2160 struct rpc_xprt *xprt = &transport->xprt; 2161 struct socket *sock = transport->sock; 2162 int status = -EIO; 2163 2164 sock = xs_create_sock(xprt, transport, 2165 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2166 IPPROTO_UDP, false); 2167 if (IS_ERR(sock)) 2168 goto out; 2169 2170 dprintk("RPC: worker connecting xprt %p via %s to " 2171 "%s (port %s)\n", xprt, 2172 xprt->address_strings[RPC_DISPLAY_PROTO], 2173 xprt->address_strings[RPC_DISPLAY_ADDR], 2174 xprt->address_strings[RPC_DISPLAY_PORT]); 2175 2176 xs_udp_finish_connecting(xprt, sock); 2177 trace_rpc_socket_connect(xprt, sock, 0); 2178 status = 0; 2179 out: 2180 xprt_unlock_connect(xprt, transport); 2181 xprt_clear_connecting(xprt); 2182 xprt_wake_pending_tasks(xprt, status); 2183 } 2184 2185 /** 2186 * xs_tcp_shutdown - gracefully shut down a TCP socket 2187 * @xprt: transport 2188 * 2189 * Initiates a graceful shutdown of the TCP socket by calling the 2190 * equivalent of shutdown(SHUT_RDWR); 2191 */ 2192 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2193 { 2194 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2195 struct socket *sock = transport->sock; 2196 2197 if (sock == NULL) 2198 return; 2199 if (xprt_connected(xprt)) { 2200 kernel_sock_shutdown(sock, SHUT_RDWR); 2201 trace_rpc_socket_shutdown(xprt, sock); 2202 } else 2203 xs_reset_transport(transport); 2204 } 2205 2206 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2207 { 2208 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2209 int ret = -ENOTCONN; 2210 2211 if (!transport->inet) { 2212 struct sock *sk = sock->sk; 2213 unsigned int keepidle = xprt->timeout->to_initval / HZ; 2214 unsigned int keepcnt = xprt->timeout->to_retries + 1; 2215 unsigned int opt_on = 1; 2216 unsigned int timeo; 2217 2218 /* TCP Keepalive options */ 2219 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2220 (char *)&opt_on, sizeof(opt_on)); 2221 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2222 (char *)&keepidle, sizeof(keepidle)); 2223 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2224 (char *)&keepidle, sizeof(keepidle)); 2225 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2226 (char *)&keepcnt, sizeof(keepcnt)); 2227 2228 /* TCP user timeout (see RFC5482) */ 2229 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2230 (xprt->timeout->to_retries + 1); 2231 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, 2232 (char *)&timeo, sizeof(timeo)); 2233 2234 write_lock_bh(&sk->sk_callback_lock); 2235 2236 xs_save_old_callbacks(transport, sk); 2237 2238 sk->sk_user_data = xprt; 2239 sk->sk_data_ready = xs_tcp_data_ready; 2240 sk->sk_state_change = xs_tcp_state_change; 2241 sk->sk_write_space = xs_tcp_write_space; 2242 sock_set_flag(sk, SOCK_FASYNC); 2243 sk->sk_error_report = xs_error_report; 2244 sk->sk_allocation = GFP_NOIO; 2245 2246 /* socket options */ 2247 sock_reset_flag(sk, SOCK_LINGER); 2248 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2249 2250 xprt_clear_connected(xprt); 2251 2252 /* Reset to new socket */ 2253 transport->sock = sock; 2254 transport->inet = sk; 2255 2256 write_unlock_bh(&sk->sk_callback_lock); 2257 } 2258 2259 if (!xprt_bound(xprt)) 2260 goto out; 2261 2262 xs_set_memalloc(xprt); 2263 2264 /* Tell the socket layer to start connecting... */ 2265 xprt->stat.connect_count++; 2266 xprt->stat.connect_start = jiffies; 2267 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2268 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2269 switch (ret) { 2270 case 0: 2271 xs_set_srcport(transport, sock); 2272 case -EINPROGRESS: 2273 /* SYN_SENT! */ 2274 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2275 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2276 } 2277 out: 2278 return ret; 2279 } 2280 2281 /** 2282 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2283 * 2284 * Invoked by a work queue tasklet. 2285 */ 2286 static void xs_tcp_setup_socket(struct work_struct *work) 2287 { 2288 struct sock_xprt *transport = 2289 container_of(work, struct sock_xprt, connect_worker.work); 2290 struct socket *sock = transport->sock; 2291 struct rpc_xprt *xprt = &transport->xprt; 2292 int status = -EIO; 2293 2294 if (!sock) { 2295 sock = xs_create_sock(xprt, transport, 2296 xs_addr(xprt)->sa_family, SOCK_STREAM, 2297 IPPROTO_TCP, true); 2298 if (IS_ERR(sock)) { 2299 status = PTR_ERR(sock); 2300 goto out; 2301 } 2302 } 2303 2304 dprintk("RPC: worker connecting xprt %p via %s to " 2305 "%s (port %s)\n", xprt, 2306 xprt->address_strings[RPC_DISPLAY_PROTO], 2307 xprt->address_strings[RPC_DISPLAY_ADDR], 2308 xprt->address_strings[RPC_DISPLAY_PORT]); 2309 2310 status = xs_tcp_finish_connecting(xprt, sock); 2311 trace_rpc_socket_connect(xprt, sock, status); 2312 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2313 xprt, -status, xprt_connected(xprt), 2314 sock->sk->sk_state); 2315 switch (status) { 2316 default: 2317 printk("%s: connect returned unhandled error %d\n", 2318 __func__, status); 2319 case -EADDRNOTAVAIL: 2320 /* We're probably in TIME_WAIT. Get rid of existing socket, 2321 * and retry 2322 */ 2323 xs_tcp_force_close(xprt); 2324 break; 2325 case 0: 2326 case -EINPROGRESS: 2327 case -EALREADY: 2328 xprt_unlock_connect(xprt, transport); 2329 return; 2330 case -EINVAL: 2331 /* Happens, for instance, if the user specified a link 2332 * local IPv6 address without a scope-id. 2333 */ 2334 case -ECONNREFUSED: 2335 case -ECONNRESET: 2336 case -ENETUNREACH: 2337 case -EADDRINUSE: 2338 case -ENOBUFS: 2339 /* retry with existing socket, after a delay */ 2340 xs_tcp_force_close(xprt); 2341 goto out; 2342 } 2343 status = -EAGAIN; 2344 out: 2345 xprt_unlock_connect(xprt, transport); 2346 xprt_clear_connecting(xprt); 2347 xprt_wake_pending_tasks(xprt, status); 2348 } 2349 2350 /** 2351 * xs_connect - connect a socket to a remote endpoint 2352 * @xprt: pointer to transport structure 2353 * @task: address of RPC task that manages state of connect request 2354 * 2355 * TCP: If the remote end dropped the connection, delay reconnecting. 2356 * 2357 * UDP socket connects are synchronous, but we use a work queue anyway 2358 * to guarantee that even unprivileged user processes can set up a 2359 * socket on a privileged port. 2360 * 2361 * If a UDP socket connect fails, the delay behavior here prevents 2362 * retry floods (hard mounts). 2363 */ 2364 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2365 { 2366 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2367 2368 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2369 2370 if (transport->sock != NULL) { 2371 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2372 "seconds\n", 2373 xprt, xprt->reestablish_timeout / HZ); 2374 2375 /* Start by resetting any existing state */ 2376 xs_reset_transport(transport); 2377 2378 queue_delayed_work(rpciod_workqueue, 2379 &transport->connect_worker, 2380 xprt->reestablish_timeout); 2381 xprt->reestablish_timeout <<= 1; 2382 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2383 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2384 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2385 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2386 } else { 2387 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2388 queue_delayed_work(rpciod_workqueue, 2389 &transport->connect_worker, 0); 2390 } 2391 } 2392 2393 /** 2394 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2395 * @xprt: rpc_xprt struct containing statistics 2396 * @seq: output file 2397 * 2398 */ 2399 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2400 { 2401 long idle_time = 0; 2402 2403 if (xprt_connected(xprt)) 2404 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2405 2406 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2407 "%llu %llu %lu %llu %llu\n", 2408 xprt->stat.bind_count, 2409 xprt->stat.connect_count, 2410 xprt->stat.connect_time, 2411 idle_time, 2412 xprt->stat.sends, 2413 xprt->stat.recvs, 2414 xprt->stat.bad_xids, 2415 xprt->stat.req_u, 2416 xprt->stat.bklog_u, 2417 xprt->stat.max_slots, 2418 xprt->stat.sending_u, 2419 xprt->stat.pending_u); 2420 } 2421 2422 /** 2423 * xs_udp_print_stats - display UDP socket-specifc stats 2424 * @xprt: rpc_xprt struct containing statistics 2425 * @seq: output file 2426 * 2427 */ 2428 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2429 { 2430 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2431 2432 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2433 "%lu %llu %llu\n", 2434 transport->srcport, 2435 xprt->stat.bind_count, 2436 xprt->stat.sends, 2437 xprt->stat.recvs, 2438 xprt->stat.bad_xids, 2439 xprt->stat.req_u, 2440 xprt->stat.bklog_u, 2441 xprt->stat.max_slots, 2442 xprt->stat.sending_u, 2443 xprt->stat.pending_u); 2444 } 2445 2446 /** 2447 * xs_tcp_print_stats - display TCP socket-specifc stats 2448 * @xprt: rpc_xprt struct containing statistics 2449 * @seq: output file 2450 * 2451 */ 2452 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2453 { 2454 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2455 long idle_time = 0; 2456 2457 if (xprt_connected(xprt)) 2458 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2459 2460 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2461 "%llu %llu %lu %llu %llu\n", 2462 transport->srcport, 2463 xprt->stat.bind_count, 2464 xprt->stat.connect_count, 2465 xprt->stat.connect_time, 2466 idle_time, 2467 xprt->stat.sends, 2468 xprt->stat.recvs, 2469 xprt->stat.bad_xids, 2470 xprt->stat.req_u, 2471 xprt->stat.bklog_u, 2472 xprt->stat.max_slots, 2473 xprt->stat.sending_u, 2474 xprt->stat.pending_u); 2475 } 2476 2477 /* 2478 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2479 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2480 * to use the server side send routines. 2481 */ 2482 static void *bc_malloc(struct rpc_task *task, size_t size) 2483 { 2484 struct page *page; 2485 struct rpc_buffer *buf; 2486 2487 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2488 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) 2489 return NULL; 2490 2491 page = alloc_page(GFP_KERNEL); 2492 if (!page) 2493 return NULL; 2494 2495 buf = page_address(page); 2496 buf->len = PAGE_SIZE; 2497 2498 return buf->data; 2499 } 2500 2501 /* 2502 * Free the space allocated in the bc_alloc routine 2503 */ 2504 static void bc_free(void *buffer) 2505 { 2506 struct rpc_buffer *buf; 2507 2508 if (!buffer) 2509 return; 2510 2511 buf = container_of(buffer, struct rpc_buffer, data); 2512 free_page((unsigned long)buf); 2513 } 2514 2515 /* 2516 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2517 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2518 */ 2519 static int bc_sendto(struct rpc_rqst *req) 2520 { 2521 int len; 2522 struct xdr_buf *xbufp = &req->rq_snd_buf; 2523 struct rpc_xprt *xprt = req->rq_xprt; 2524 struct sock_xprt *transport = 2525 container_of(xprt, struct sock_xprt, xprt); 2526 struct socket *sock = transport->sock; 2527 unsigned long headoff; 2528 unsigned long tailoff; 2529 2530 xs_encode_stream_record_marker(xbufp); 2531 2532 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2533 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2534 len = svc_send_common(sock, xbufp, 2535 virt_to_page(xbufp->head[0].iov_base), headoff, 2536 xbufp->tail[0].iov_base, tailoff); 2537 2538 if (len != xbufp->len) { 2539 printk(KERN_NOTICE "Error sending entire callback!\n"); 2540 len = -EAGAIN; 2541 } 2542 2543 return len; 2544 } 2545 2546 /* 2547 * The send routine. Borrows from svc_send 2548 */ 2549 static int bc_send_request(struct rpc_task *task) 2550 { 2551 struct rpc_rqst *req = task->tk_rqstp; 2552 struct svc_xprt *xprt; 2553 int len; 2554 2555 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2556 /* 2557 * Get the server socket associated with this callback xprt 2558 */ 2559 xprt = req->rq_xprt->bc_xprt; 2560 2561 /* 2562 * Grab the mutex to serialize data as the connection is shared 2563 * with the fore channel 2564 */ 2565 if (!mutex_trylock(&xprt->xpt_mutex)) { 2566 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2567 if (!mutex_trylock(&xprt->xpt_mutex)) 2568 return -EAGAIN; 2569 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2570 } 2571 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2572 len = -ENOTCONN; 2573 else 2574 len = bc_sendto(req); 2575 mutex_unlock(&xprt->xpt_mutex); 2576 2577 if (len > 0) 2578 len = 0; 2579 2580 return len; 2581 } 2582 2583 /* 2584 * The close routine. Since this is client initiated, we do nothing 2585 */ 2586 2587 static void bc_close(struct rpc_xprt *xprt) 2588 { 2589 } 2590 2591 /* 2592 * The xprt destroy routine. Again, because this connection is client 2593 * initiated, we do nothing 2594 */ 2595 2596 static void bc_destroy(struct rpc_xprt *xprt) 2597 { 2598 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2599 2600 xs_xprt_free(xprt); 2601 module_put(THIS_MODULE); 2602 } 2603 2604 static struct rpc_xprt_ops xs_local_ops = { 2605 .reserve_xprt = xprt_reserve_xprt, 2606 .release_xprt = xs_tcp_release_xprt, 2607 .alloc_slot = xprt_alloc_slot, 2608 .rpcbind = xs_local_rpcbind, 2609 .set_port = xs_local_set_port, 2610 .connect = xs_local_connect, 2611 .buf_alloc = rpc_malloc, 2612 .buf_free = rpc_free, 2613 .send_request = xs_local_send_request, 2614 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2615 .close = xs_close, 2616 .destroy = xs_destroy, 2617 .print_stats = xs_local_print_stats, 2618 .enable_swap = xs_enable_swap, 2619 .disable_swap = xs_disable_swap, 2620 }; 2621 2622 static struct rpc_xprt_ops xs_udp_ops = { 2623 .set_buffer_size = xs_udp_set_buffer_size, 2624 .reserve_xprt = xprt_reserve_xprt_cong, 2625 .release_xprt = xprt_release_xprt_cong, 2626 .alloc_slot = xprt_alloc_slot, 2627 .rpcbind = rpcb_getport_async, 2628 .set_port = xs_set_port, 2629 .connect = xs_connect, 2630 .buf_alloc = rpc_malloc, 2631 .buf_free = rpc_free, 2632 .send_request = xs_udp_send_request, 2633 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2634 .timer = xs_udp_timer, 2635 .release_request = xprt_release_rqst_cong, 2636 .close = xs_close, 2637 .destroy = xs_destroy, 2638 .print_stats = xs_udp_print_stats, 2639 .enable_swap = xs_enable_swap, 2640 .disable_swap = xs_disable_swap, 2641 .inject_disconnect = xs_inject_disconnect, 2642 }; 2643 2644 static struct rpc_xprt_ops xs_tcp_ops = { 2645 .reserve_xprt = xprt_reserve_xprt, 2646 .release_xprt = xs_tcp_release_xprt, 2647 .alloc_slot = xprt_lock_and_alloc_slot, 2648 .rpcbind = rpcb_getport_async, 2649 .set_port = xs_set_port, 2650 .connect = xs_connect, 2651 .buf_alloc = rpc_malloc, 2652 .buf_free = rpc_free, 2653 .send_request = xs_tcp_send_request, 2654 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2655 .close = xs_tcp_shutdown, 2656 .destroy = xs_destroy, 2657 .print_stats = xs_tcp_print_stats, 2658 .enable_swap = xs_enable_swap, 2659 .disable_swap = xs_disable_swap, 2660 .inject_disconnect = xs_inject_disconnect, 2661 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2662 .bc_setup = xprt_setup_bc, 2663 .bc_up = xs_tcp_bc_up, 2664 .bc_free_rqst = xprt_free_bc_rqst, 2665 .bc_destroy = xprt_destroy_bc, 2666 #endif 2667 }; 2668 2669 /* 2670 * The rpc_xprt_ops for the server backchannel 2671 */ 2672 2673 static struct rpc_xprt_ops bc_tcp_ops = { 2674 .reserve_xprt = xprt_reserve_xprt, 2675 .release_xprt = xprt_release_xprt, 2676 .alloc_slot = xprt_alloc_slot, 2677 .buf_alloc = bc_malloc, 2678 .buf_free = bc_free, 2679 .send_request = bc_send_request, 2680 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2681 .close = bc_close, 2682 .destroy = bc_destroy, 2683 .print_stats = xs_tcp_print_stats, 2684 .enable_swap = xs_enable_swap, 2685 .disable_swap = xs_disable_swap, 2686 .inject_disconnect = xs_inject_disconnect, 2687 }; 2688 2689 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2690 { 2691 static const struct sockaddr_in sin = { 2692 .sin_family = AF_INET, 2693 .sin_addr.s_addr = htonl(INADDR_ANY), 2694 }; 2695 static const struct sockaddr_in6 sin6 = { 2696 .sin6_family = AF_INET6, 2697 .sin6_addr = IN6ADDR_ANY_INIT, 2698 }; 2699 2700 switch (family) { 2701 case AF_LOCAL: 2702 break; 2703 case AF_INET: 2704 memcpy(sap, &sin, sizeof(sin)); 2705 break; 2706 case AF_INET6: 2707 memcpy(sap, &sin6, sizeof(sin6)); 2708 break; 2709 default: 2710 dprintk("RPC: %s: Bad address family\n", __func__); 2711 return -EAFNOSUPPORT; 2712 } 2713 return 0; 2714 } 2715 2716 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2717 unsigned int slot_table_size, 2718 unsigned int max_slot_table_size) 2719 { 2720 struct rpc_xprt *xprt; 2721 struct sock_xprt *new; 2722 2723 if (args->addrlen > sizeof(xprt->addr)) { 2724 dprintk("RPC: xs_setup_xprt: address too large\n"); 2725 return ERR_PTR(-EBADF); 2726 } 2727 2728 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2729 max_slot_table_size); 2730 if (xprt == NULL) { 2731 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2732 "rpc_xprt\n"); 2733 return ERR_PTR(-ENOMEM); 2734 } 2735 2736 new = container_of(xprt, struct sock_xprt, xprt); 2737 mutex_init(&new->recv_mutex); 2738 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2739 xprt->addrlen = args->addrlen; 2740 if (args->srcaddr) 2741 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2742 else { 2743 int err; 2744 err = xs_init_anyaddr(args->dstaddr->sa_family, 2745 (struct sockaddr *)&new->srcaddr); 2746 if (err != 0) { 2747 xprt_free(xprt); 2748 return ERR_PTR(err); 2749 } 2750 } 2751 2752 return xprt; 2753 } 2754 2755 static const struct rpc_timeout xs_local_default_timeout = { 2756 .to_initval = 10 * HZ, 2757 .to_maxval = 10 * HZ, 2758 .to_retries = 2, 2759 }; 2760 2761 /** 2762 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2763 * @args: rpc transport creation arguments 2764 * 2765 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2766 */ 2767 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2768 { 2769 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2770 struct sock_xprt *transport; 2771 struct rpc_xprt *xprt; 2772 struct rpc_xprt *ret; 2773 2774 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2775 xprt_max_tcp_slot_table_entries); 2776 if (IS_ERR(xprt)) 2777 return xprt; 2778 transport = container_of(xprt, struct sock_xprt, xprt); 2779 2780 xprt->prot = 0; 2781 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2782 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2783 2784 xprt->bind_timeout = XS_BIND_TO; 2785 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2786 xprt->idle_timeout = XS_IDLE_DISC_TO; 2787 2788 xprt->ops = &xs_local_ops; 2789 xprt->timeout = &xs_local_default_timeout; 2790 2791 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn); 2792 INIT_DELAYED_WORK(&transport->connect_worker, 2793 xs_dummy_setup_socket); 2794 2795 switch (sun->sun_family) { 2796 case AF_LOCAL: 2797 if (sun->sun_path[0] != '/') { 2798 dprintk("RPC: bad AF_LOCAL address: %s\n", 2799 sun->sun_path); 2800 ret = ERR_PTR(-EINVAL); 2801 goto out_err; 2802 } 2803 xprt_set_bound(xprt); 2804 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2805 ret = ERR_PTR(xs_local_setup_socket(transport)); 2806 if (ret) 2807 goto out_err; 2808 break; 2809 default: 2810 ret = ERR_PTR(-EAFNOSUPPORT); 2811 goto out_err; 2812 } 2813 2814 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2815 xprt->address_strings[RPC_DISPLAY_ADDR]); 2816 2817 if (try_module_get(THIS_MODULE)) 2818 return xprt; 2819 ret = ERR_PTR(-EINVAL); 2820 out_err: 2821 xs_xprt_free(xprt); 2822 return ret; 2823 } 2824 2825 static const struct rpc_timeout xs_udp_default_timeout = { 2826 .to_initval = 5 * HZ, 2827 .to_maxval = 30 * HZ, 2828 .to_increment = 5 * HZ, 2829 .to_retries = 5, 2830 }; 2831 2832 /** 2833 * xs_setup_udp - Set up transport to use a UDP socket 2834 * @args: rpc transport creation arguments 2835 * 2836 */ 2837 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2838 { 2839 struct sockaddr *addr = args->dstaddr; 2840 struct rpc_xprt *xprt; 2841 struct sock_xprt *transport; 2842 struct rpc_xprt *ret; 2843 2844 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2845 xprt_udp_slot_table_entries); 2846 if (IS_ERR(xprt)) 2847 return xprt; 2848 transport = container_of(xprt, struct sock_xprt, xprt); 2849 2850 xprt->prot = IPPROTO_UDP; 2851 xprt->tsh_size = 0; 2852 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2853 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2854 2855 xprt->bind_timeout = XS_BIND_TO; 2856 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2857 xprt->idle_timeout = XS_IDLE_DISC_TO; 2858 2859 xprt->ops = &xs_udp_ops; 2860 2861 xprt->timeout = &xs_udp_default_timeout; 2862 2863 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2864 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 2865 2866 switch (addr->sa_family) { 2867 case AF_INET: 2868 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2869 xprt_set_bound(xprt); 2870 2871 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2872 break; 2873 case AF_INET6: 2874 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2875 xprt_set_bound(xprt); 2876 2877 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2878 break; 2879 default: 2880 ret = ERR_PTR(-EAFNOSUPPORT); 2881 goto out_err; 2882 } 2883 2884 if (xprt_bound(xprt)) 2885 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2886 xprt->address_strings[RPC_DISPLAY_ADDR], 2887 xprt->address_strings[RPC_DISPLAY_PORT], 2888 xprt->address_strings[RPC_DISPLAY_PROTO]); 2889 else 2890 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2891 xprt->address_strings[RPC_DISPLAY_ADDR], 2892 xprt->address_strings[RPC_DISPLAY_PROTO]); 2893 2894 if (try_module_get(THIS_MODULE)) 2895 return xprt; 2896 ret = ERR_PTR(-EINVAL); 2897 out_err: 2898 xs_xprt_free(xprt); 2899 return ret; 2900 } 2901 2902 static const struct rpc_timeout xs_tcp_default_timeout = { 2903 .to_initval = 60 * HZ, 2904 .to_maxval = 60 * HZ, 2905 .to_retries = 2, 2906 }; 2907 2908 /** 2909 * xs_setup_tcp - Set up transport to use a TCP socket 2910 * @args: rpc transport creation arguments 2911 * 2912 */ 2913 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2914 { 2915 struct sockaddr *addr = args->dstaddr; 2916 struct rpc_xprt *xprt; 2917 struct sock_xprt *transport; 2918 struct rpc_xprt *ret; 2919 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2920 2921 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2922 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2923 2924 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2925 max_slot_table_size); 2926 if (IS_ERR(xprt)) 2927 return xprt; 2928 transport = container_of(xprt, struct sock_xprt, xprt); 2929 2930 xprt->prot = IPPROTO_TCP; 2931 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2932 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2933 2934 xprt->bind_timeout = XS_BIND_TO; 2935 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2936 xprt->idle_timeout = XS_IDLE_DISC_TO; 2937 2938 xprt->ops = &xs_tcp_ops; 2939 xprt->timeout = &xs_tcp_default_timeout; 2940 2941 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn); 2942 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 2943 2944 switch (addr->sa_family) { 2945 case AF_INET: 2946 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2947 xprt_set_bound(xprt); 2948 2949 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2950 break; 2951 case AF_INET6: 2952 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2953 xprt_set_bound(xprt); 2954 2955 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2956 break; 2957 default: 2958 ret = ERR_PTR(-EAFNOSUPPORT); 2959 goto out_err; 2960 } 2961 2962 if (xprt_bound(xprt)) 2963 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2964 xprt->address_strings[RPC_DISPLAY_ADDR], 2965 xprt->address_strings[RPC_DISPLAY_PORT], 2966 xprt->address_strings[RPC_DISPLAY_PROTO]); 2967 else 2968 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2969 xprt->address_strings[RPC_DISPLAY_ADDR], 2970 xprt->address_strings[RPC_DISPLAY_PROTO]); 2971 2972 if (try_module_get(THIS_MODULE)) 2973 return xprt; 2974 ret = ERR_PTR(-EINVAL); 2975 out_err: 2976 xs_xprt_free(xprt); 2977 return ret; 2978 } 2979 2980 /** 2981 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2982 * @args: rpc transport creation arguments 2983 * 2984 */ 2985 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2986 { 2987 struct sockaddr *addr = args->dstaddr; 2988 struct rpc_xprt *xprt; 2989 struct sock_xprt *transport; 2990 struct svc_sock *bc_sock; 2991 struct rpc_xprt *ret; 2992 2993 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2994 xprt_tcp_slot_table_entries); 2995 if (IS_ERR(xprt)) 2996 return xprt; 2997 transport = container_of(xprt, struct sock_xprt, xprt); 2998 2999 xprt->prot = IPPROTO_TCP; 3000 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 3001 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3002 xprt->timeout = &xs_tcp_default_timeout; 3003 3004 /* backchannel */ 3005 xprt_set_bound(xprt); 3006 xprt->bind_timeout = 0; 3007 xprt->reestablish_timeout = 0; 3008 xprt->idle_timeout = 0; 3009 3010 xprt->ops = &bc_tcp_ops; 3011 3012 switch (addr->sa_family) { 3013 case AF_INET: 3014 xs_format_peer_addresses(xprt, "tcp", 3015 RPCBIND_NETID_TCP); 3016 break; 3017 case AF_INET6: 3018 xs_format_peer_addresses(xprt, "tcp", 3019 RPCBIND_NETID_TCP6); 3020 break; 3021 default: 3022 ret = ERR_PTR(-EAFNOSUPPORT); 3023 goto out_err; 3024 } 3025 3026 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3027 xprt->address_strings[RPC_DISPLAY_ADDR], 3028 xprt->address_strings[RPC_DISPLAY_PORT], 3029 xprt->address_strings[RPC_DISPLAY_PROTO]); 3030 3031 /* 3032 * Once we've associated a backchannel xprt with a connection, 3033 * we want to keep it around as long as the connection lasts, 3034 * in case we need to start using it for a backchannel again; 3035 * this reference won't be dropped until bc_xprt is destroyed. 3036 */ 3037 xprt_get(xprt); 3038 args->bc_xprt->xpt_bc_xprt = xprt; 3039 xprt->bc_xprt = args->bc_xprt; 3040 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3041 transport->sock = bc_sock->sk_sock; 3042 transport->inet = bc_sock->sk_sk; 3043 3044 /* 3045 * Since we don't want connections for the backchannel, we set 3046 * the xprt status to connected 3047 */ 3048 xprt_set_connected(xprt); 3049 3050 if (try_module_get(THIS_MODULE)) 3051 return xprt; 3052 3053 args->bc_xprt->xpt_bc_xprt = NULL; 3054 xprt_put(xprt); 3055 ret = ERR_PTR(-EINVAL); 3056 out_err: 3057 xs_xprt_free(xprt); 3058 return ret; 3059 } 3060 3061 static struct xprt_class xs_local_transport = { 3062 .list = LIST_HEAD_INIT(xs_local_transport.list), 3063 .name = "named UNIX socket", 3064 .owner = THIS_MODULE, 3065 .ident = XPRT_TRANSPORT_LOCAL, 3066 .setup = xs_setup_local, 3067 }; 3068 3069 static struct xprt_class xs_udp_transport = { 3070 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3071 .name = "udp", 3072 .owner = THIS_MODULE, 3073 .ident = XPRT_TRANSPORT_UDP, 3074 .setup = xs_setup_udp, 3075 }; 3076 3077 static struct xprt_class xs_tcp_transport = { 3078 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3079 .name = "tcp", 3080 .owner = THIS_MODULE, 3081 .ident = XPRT_TRANSPORT_TCP, 3082 .setup = xs_setup_tcp, 3083 }; 3084 3085 static struct xprt_class xs_bc_tcp_transport = { 3086 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3087 .name = "tcp NFSv4.1 backchannel", 3088 .owner = THIS_MODULE, 3089 .ident = XPRT_TRANSPORT_BC_TCP, 3090 .setup = xs_setup_bc_tcp, 3091 }; 3092 3093 /** 3094 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3095 * 3096 */ 3097 int init_socket_xprt(void) 3098 { 3099 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3100 if (!sunrpc_table_header) 3101 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3102 #endif 3103 3104 xprt_register_transport(&xs_local_transport); 3105 xprt_register_transport(&xs_udp_transport); 3106 xprt_register_transport(&xs_tcp_transport); 3107 xprt_register_transport(&xs_bc_tcp_transport); 3108 3109 return 0; 3110 } 3111 3112 /** 3113 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3114 * 3115 */ 3116 void cleanup_socket_xprt(void) 3117 { 3118 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3119 if (sunrpc_table_header) { 3120 unregister_sysctl_table(sunrpc_table_header); 3121 sunrpc_table_header = NULL; 3122 } 3123 #endif 3124 3125 xprt_unregister_transport(&xs_local_transport); 3126 xprt_unregister_transport(&xs_udp_transport); 3127 xprt_unregister_transport(&xs_tcp_transport); 3128 xprt_unregister_transport(&xs_bc_tcp_transport); 3129 } 3130 3131 static int param_set_uint_minmax(const char *val, 3132 const struct kernel_param *kp, 3133 unsigned int min, unsigned int max) 3134 { 3135 unsigned int num; 3136 int ret; 3137 3138 if (!val) 3139 return -EINVAL; 3140 ret = kstrtouint(val, 0, &num); 3141 if (ret == -EINVAL || num < min || num > max) 3142 return -EINVAL; 3143 *((unsigned int *)kp->arg) = num; 3144 return 0; 3145 } 3146 3147 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3148 { 3149 return param_set_uint_minmax(val, kp, 3150 RPC_MIN_RESVPORT, 3151 RPC_MAX_RESVPORT); 3152 } 3153 3154 static const struct kernel_param_ops param_ops_portnr = { 3155 .set = param_set_portnr, 3156 .get = param_get_uint, 3157 }; 3158 3159 #define param_check_portnr(name, p) \ 3160 __param_check(name, p, unsigned int); 3161 3162 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3163 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3164 3165 static int param_set_slot_table_size(const char *val, 3166 const struct kernel_param *kp) 3167 { 3168 return param_set_uint_minmax(val, kp, 3169 RPC_MIN_SLOT_TABLE, 3170 RPC_MAX_SLOT_TABLE); 3171 } 3172 3173 static const struct kernel_param_ops param_ops_slot_table_size = { 3174 .set = param_set_slot_table_size, 3175 .get = param_get_uint, 3176 }; 3177 3178 #define param_check_slot_table_size(name, p) \ 3179 __param_check(name, p, unsigned int); 3180 3181 static int param_set_max_slot_table_size(const char *val, 3182 const struct kernel_param *kp) 3183 { 3184 return param_set_uint_minmax(val, kp, 3185 RPC_MIN_SLOT_TABLE, 3186 RPC_MAX_SLOT_TABLE_LIMIT); 3187 } 3188 3189 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3190 .set = param_set_max_slot_table_size, 3191 .get = param_get_uint, 3192 }; 3193 3194 #define param_check_max_slot_table_size(name, p) \ 3195 __param_check(name, p, unsigned int); 3196 3197 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3198 slot_table_size, 0644); 3199 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3200 max_slot_table_size, 0644); 3201 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3202 slot_table_size, 0644); 3203 3204