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 - sizeof(struct udphdr); 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, sizeof(struct udphdr), 1006 sizeof(_xid), &_xid); 1007 if (xp == NULL) 1008 return; 1009 1010 /* Look up and lock the request corresponding to the given XID */ 1011 spin_lock_bh(&xprt->transport_lock); 1012 rovr = xprt_lookup_rqst(xprt, *xp); 1013 if (!rovr) 1014 goto out_unlock; 1015 task = rovr->rq_task; 1016 1017 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1018 copied = repsize; 1019 1020 /* Suck it into the iovec, verify checksum if not done by hw. */ 1021 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1022 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 1023 goto out_unlock; 1024 } 1025 1026 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 1027 1028 xprt_adjust_cwnd(xprt, task, copied); 1029 xprt_complete_rqst(task, copied); 1030 1031 out_unlock: 1032 spin_unlock_bh(&xprt->transport_lock); 1033 } 1034 1035 static void xs_udp_data_receive(struct sock_xprt *transport) 1036 { 1037 struct sk_buff *skb; 1038 struct sock *sk; 1039 int err; 1040 1041 mutex_lock(&transport->recv_mutex); 1042 sk = transport->inet; 1043 if (sk == NULL) 1044 goto out; 1045 for (;;) { 1046 skb = skb_recv_datagram(sk, 0, 1, &err); 1047 if (skb == NULL) 1048 break; 1049 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1050 skb_free_datagram(sk, skb); 1051 } 1052 out: 1053 mutex_unlock(&transport->recv_mutex); 1054 } 1055 1056 static void xs_udp_data_receive_workfn(struct work_struct *work) 1057 { 1058 struct sock_xprt *transport = 1059 container_of(work, struct sock_xprt, recv_worker); 1060 xs_udp_data_receive(transport); 1061 } 1062 1063 /** 1064 * xs_data_ready - "data ready" callback for UDP sockets 1065 * @sk: socket with data to read 1066 * 1067 */ 1068 static void xs_data_ready(struct sock *sk) 1069 { 1070 struct rpc_xprt *xprt; 1071 1072 read_lock_bh(&sk->sk_callback_lock); 1073 dprintk("RPC: xs_data_ready...\n"); 1074 xprt = xprt_from_sock(sk); 1075 if (xprt != NULL) { 1076 struct sock_xprt *transport = container_of(xprt, 1077 struct sock_xprt, xprt); 1078 queue_work(rpciod_workqueue, &transport->recv_worker); 1079 } 1080 read_unlock_bh(&sk->sk_callback_lock); 1081 } 1082 1083 /* 1084 * Helper function to force a TCP close if the server is sending 1085 * junk and/or it has put us in CLOSE_WAIT 1086 */ 1087 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1088 { 1089 xprt_force_disconnect(xprt); 1090 } 1091 1092 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1093 { 1094 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1095 size_t len, used; 1096 char *p; 1097 1098 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1099 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1100 used = xdr_skb_read_bits(desc, p, len); 1101 transport->tcp_offset += used; 1102 if (used != len) 1103 return; 1104 1105 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1106 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1107 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1108 else 1109 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1110 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1111 1112 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1113 transport->tcp_offset = 0; 1114 1115 /* Sanity check of the record length */ 1116 if (unlikely(transport->tcp_reclen < 8)) { 1117 dprintk("RPC: invalid TCP record fragment length\n"); 1118 xs_tcp_force_close(xprt); 1119 return; 1120 } 1121 dprintk("RPC: reading TCP record fragment of length %d\n", 1122 transport->tcp_reclen); 1123 } 1124 1125 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1126 { 1127 if (transport->tcp_offset == transport->tcp_reclen) { 1128 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1129 transport->tcp_offset = 0; 1130 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1131 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1132 transport->tcp_flags |= TCP_RCV_COPY_XID; 1133 transport->tcp_copied = 0; 1134 } 1135 } 1136 } 1137 1138 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1139 { 1140 size_t len, used; 1141 char *p; 1142 1143 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1144 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1145 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1146 used = xdr_skb_read_bits(desc, p, len); 1147 transport->tcp_offset += used; 1148 if (used != len) 1149 return; 1150 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1151 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1152 transport->tcp_copied = 4; 1153 dprintk("RPC: reading %s XID %08x\n", 1154 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1155 : "request with", 1156 ntohl(transport->tcp_xid)); 1157 xs_tcp_check_fraghdr(transport); 1158 } 1159 1160 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1161 struct xdr_skb_reader *desc) 1162 { 1163 size_t len, used; 1164 u32 offset; 1165 char *p; 1166 1167 /* 1168 * We want transport->tcp_offset to be 8 at the end of this routine 1169 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1170 * When this function is called for the first time, 1171 * transport->tcp_offset is 4 (after having already read the xid). 1172 */ 1173 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1174 len = sizeof(transport->tcp_calldir) - offset; 1175 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1176 p = ((char *) &transport->tcp_calldir) + offset; 1177 used = xdr_skb_read_bits(desc, p, len); 1178 transport->tcp_offset += used; 1179 if (used != len) 1180 return; 1181 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1182 /* 1183 * We don't yet have the XDR buffer, so we will write the calldir 1184 * out after we get the buffer from the 'struct rpc_rqst' 1185 */ 1186 switch (ntohl(transport->tcp_calldir)) { 1187 case RPC_REPLY: 1188 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1189 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1190 transport->tcp_flags |= TCP_RPC_REPLY; 1191 break; 1192 case RPC_CALL: 1193 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1194 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1195 transport->tcp_flags &= ~TCP_RPC_REPLY; 1196 break; 1197 default: 1198 dprintk("RPC: invalid request message type\n"); 1199 xs_tcp_force_close(&transport->xprt); 1200 } 1201 xs_tcp_check_fraghdr(transport); 1202 } 1203 1204 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1205 struct xdr_skb_reader *desc, 1206 struct rpc_rqst *req) 1207 { 1208 struct sock_xprt *transport = 1209 container_of(xprt, struct sock_xprt, xprt); 1210 struct xdr_buf *rcvbuf; 1211 size_t len; 1212 ssize_t r; 1213 1214 rcvbuf = &req->rq_private_buf; 1215 1216 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1217 /* 1218 * Save the RPC direction in the XDR buffer 1219 */ 1220 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1221 &transport->tcp_calldir, 1222 sizeof(transport->tcp_calldir)); 1223 transport->tcp_copied += sizeof(transport->tcp_calldir); 1224 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1225 } 1226 1227 len = desc->count; 1228 if (len > transport->tcp_reclen - transport->tcp_offset) { 1229 struct xdr_skb_reader my_desc; 1230 1231 len = transport->tcp_reclen - transport->tcp_offset; 1232 memcpy(&my_desc, desc, sizeof(my_desc)); 1233 my_desc.count = len; 1234 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1235 &my_desc, xdr_skb_read_bits); 1236 desc->count -= r; 1237 desc->offset += r; 1238 } else 1239 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1240 desc, xdr_skb_read_bits); 1241 1242 if (r > 0) { 1243 transport->tcp_copied += r; 1244 transport->tcp_offset += r; 1245 } 1246 if (r != len) { 1247 /* Error when copying to the receive buffer, 1248 * usually because we weren't able to allocate 1249 * additional buffer pages. All we can do now 1250 * is turn off TCP_RCV_COPY_DATA, so the request 1251 * will not receive any additional updates, 1252 * and time out. 1253 * Any remaining data from this record will 1254 * be discarded. 1255 */ 1256 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1257 dprintk("RPC: XID %08x truncated request\n", 1258 ntohl(transport->tcp_xid)); 1259 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1260 "tcp_offset = %u, tcp_reclen = %u\n", 1261 xprt, transport->tcp_copied, 1262 transport->tcp_offset, transport->tcp_reclen); 1263 return; 1264 } 1265 1266 dprintk("RPC: XID %08x read %Zd bytes\n", 1267 ntohl(transport->tcp_xid), r); 1268 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1269 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1270 transport->tcp_offset, transport->tcp_reclen); 1271 1272 if (transport->tcp_copied == req->rq_private_buf.buflen) 1273 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1274 else if (transport->tcp_offset == transport->tcp_reclen) { 1275 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1276 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1277 } 1278 } 1279 1280 /* 1281 * Finds the request corresponding to the RPC xid and invokes the common 1282 * tcp read code to read the data. 1283 */ 1284 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1285 struct xdr_skb_reader *desc) 1286 { 1287 struct sock_xprt *transport = 1288 container_of(xprt, struct sock_xprt, xprt); 1289 struct rpc_rqst *req; 1290 1291 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1292 1293 /* Find and lock the request corresponding to this xid */ 1294 spin_lock_bh(&xprt->transport_lock); 1295 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1296 if (!req) { 1297 dprintk("RPC: XID %08x request not found!\n", 1298 ntohl(transport->tcp_xid)); 1299 spin_unlock_bh(&xprt->transport_lock); 1300 return -1; 1301 } 1302 1303 xs_tcp_read_common(xprt, desc, req); 1304 1305 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1306 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1307 1308 spin_unlock_bh(&xprt->transport_lock); 1309 return 0; 1310 } 1311 1312 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1313 /* 1314 * Obtains an rpc_rqst previously allocated and invokes the common 1315 * tcp read code to read the data. The result is placed in the callback 1316 * queue. 1317 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1318 * connection and return -1. 1319 */ 1320 static int xs_tcp_read_callback(struct rpc_xprt *xprt, 1321 struct xdr_skb_reader *desc) 1322 { 1323 struct sock_xprt *transport = 1324 container_of(xprt, struct sock_xprt, xprt); 1325 struct rpc_rqst *req; 1326 1327 /* Look up and lock the request corresponding to the given XID */ 1328 spin_lock_bh(&xprt->transport_lock); 1329 req = xprt_lookup_bc_request(xprt, transport->tcp_xid); 1330 if (req == NULL) { 1331 spin_unlock_bh(&xprt->transport_lock); 1332 printk(KERN_WARNING "Callback slot table overflowed\n"); 1333 xprt_force_disconnect(xprt); 1334 return -1; 1335 } 1336 1337 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1338 xs_tcp_read_common(xprt, desc, req); 1339 1340 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1341 xprt_complete_bc_request(req, transport->tcp_copied); 1342 spin_unlock_bh(&xprt->transport_lock); 1343 1344 return 0; 1345 } 1346 1347 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1348 struct xdr_skb_reader *desc) 1349 { 1350 struct sock_xprt *transport = 1351 container_of(xprt, struct sock_xprt, xprt); 1352 1353 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1354 xs_tcp_read_reply(xprt, desc) : 1355 xs_tcp_read_callback(xprt, desc); 1356 } 1357 1358 static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net) 1359 { 1360 int ret; 1361 1362 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0, 1363 SVC_SOCK_ANONYMOUS); 1364 if (ret < 0) 1365 return ret; 1366 return 0; 1367 } 1368 #else 1369 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1370 struct xdr_skb_reader *desc) 1371 { 1372 return xs_tcp_read_reply(xprt, desc); 1373 } 1374 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1375 1376 /* 1377 * Read data off the transport. This can be either an RPC_CALL or an 1378 * RPC_REPLY. Relay the processing to helper functions. 1379 */ 1380 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1381 struct xdr_skb_reader *desc) 1382 { 1383 struct sock_xprt *transport = 1384 container_of(xprt, struct sock_xprt, xprt); 1385 1386 if (_xs_tcp_read_data(xprt, desc) == 0) 1387 xs_tcp_check_fraghdr(transport); 1388 else { 1389 /* 1390 * The transport_lock protects the request handling. 1391 * There's no need to hold it to update the tcp_flags. 1392 */ 1393 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1394 } 1395 } 1396 1397 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1398 { 1399 size_t len; 1400 1401 len = transport->tcp_reclen - transport->tcp_offset; 1402 if (len > desc->count) 1403 len = desc->count; 1404 desc->count -= len; 1405 desc->offset += len; 1406 transport->tcp_offset += len; 1407 dprintk("RPC: discarded %Zu bytes\n", len); 1408 xs_tcp_check_fraghdr(transport); 1409 } 1410 1411 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1412 { 1413 struct rpc_xprt *xprt = rd_desc->arg.data; 1414 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1415 struct xdr_skb_reader desc = { 1416 .skb = skb, 1417 .offset = offset, 1418 .count = len, 1419 }; 1420 1421 dprintk("RPC: xs_tcp_data_recv started\n"); 1422 do { 1423 trace_xs_tcp_data_recv(transport); 1424 /* Read in a new fragment marker if necessary */ 1425 /* Can we ever really expect to get completely empty fragments? */ 1426 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1427 xs_tcp_read_fraghdr(xprt, &desc); 1428 continue; 1429 } 1430 /* Read in the xid if necessary */ 1431 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1432 xs_tcp_read_xid(transport, &desc); 1433 continue; 1434 } 1435 /* Read in the call/reply flag */ 1436 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1437 xs_tcp_read_calldir(transport, &desc); 1438 continue; 1439 } 1440 /* Read in the request data */ 1441 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1442 xs_tcp_read_data(xprt, &desc); 1443 continue; 1444 } 1445 /* Skip over any trailing bytes on short reads */ 1446 xs_tcp_read_discard(transport, &desc); 1447 } while (desc.count); 1448 trace_xs_tcp_data_recv(transport); 1449 dprintk("RPC: xs_tcp_data_recv done\n"); 1450 return len - desc.count; 1451 } 1452 1453 static void xs_tcp_data_receive(struct sock_xprt *transport) 1454 { 1455 struct rpc_xprt *xprt = &transport->xprt; 1456 struct sock *sk; 1457 read_descriptor_t rd_desc = { 1458 .count = 2*1024*1024, 1459 .arg.data = xprt, 1460 }; 1461 unsigned long total = 0; 1462 int read = 0; 1463 1464 mutex_lock(&transport->recv_mutex); 1465 sk = transport->inet; 1466 if (sk == NULL) 1467 goto out; 1468 1469 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1470 for (;;) { 1471 lock_sock(sk); 1472 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1473 release_sock(sk); 1474 if (read <= 0) 1475 break; 1476 total += read; 1477 rd_desc.count = 65536; 1478 } 1479 out: 1480 mutex_unlock(&transport->recv_mutex); 1481 trace_xs_tcp_data_ready(xprt, read, total); 1482 } 1483 1484 static void xs_tcp_data_receive_workfn(struct work_struct *work) 1485 { 1486 struct sock_xprt *transport = 1487 container_of(work, struct sock_xprt, recv_worker); 1488 xs_tcp_data_receive(transport); 1489 } 1490 1491 /** 1492 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1493 * @sk: socket with data to read 1494 * 1495 */ 1496 static void xs_tcp_data_ready(struct sock *sk) 1497 { 1498 struct sock_xprt *transport; 1499 struct rpc_xprt *xprt; 1500 1501 dprintk("RPC: xs_tcp_data_ready...\n"); 1502 1503 read_lock_bh(&sk->sk_callback_lock); 1504 if (!(xprt = xprt_from_sock(sk))) 1505 goto out; 1506 transport = container_of(xprt, struct sock_xprt, xprt); 1507 1508 /* Any data means we had a useful conversation, so 1509 * the we don't need to delay the next reconnect 1510 */ 1511 if (xprt->reestablish_timeout) 1512 xprt->reestablish_timeout = 0; 1513 queue_work(rpciod_workqueue, &transport->recv_worker); 1514 1515 out: 1516 read_unlock_bh(&sk->sk_callback_lock); 1517 } 1518 1519 /** 1520 * xs_tcp_state_change - callback to handle TCP socket state changes 1521 * @sk: socket whose state has changed 1522 * 1523 */ 1524 static void xs_tcp_state_change(struct sock *sk) 1525 { 1526 struct rpc_xprt *xprt; 1527 struct sock_xprt *transport; 1528 1529 read_lock_bh(&sk->sk_callback_lock); 1530 if (!(xprt = xprt_from_sock(sk))) 1531 goto out; 1532 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1533 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1534 sk->sk_state, xprt_connected(xprt), 1535 sock_flag(sk, SOCK_DEAD), 1536 sock_flag(sk, SOCK_ZAPPED), 1537 sk->sk_shutdown); 1538 1539 transport = container_of(xprt, struct sock_xprt, xprt); 1540 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1541 switch (sk->sk_state) { 1542 case TCP_ESTABLISHED: 1543 spin_lock(&xprt->transport_lock); 1544 if (!xprt_test_and_set_connected(xprt)) { 1545 1546 /* Reset TCP record info */ 1547 transport->tcp_offset = 0; 1548 transport->tcp_reclen = 0; 1549 transport->tcp_copied = 0; 1550 transport->tcp_flags = 1551 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1552 xprt->connect_cookie++; 1553 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1554 xprt_clear_connecting(xprt); 1555 1556 xprt_wake_pending_tasks(xprt, -EAGAIN); 1557 } 1558 spin_unlock(&xprt->transport_lock); 1559 break; 1560 case TCP_FIN_WAIT1: 1561 /* The client initiated a shutdown of the socket */ 1562 xprt->connect_cookie++; 1563 xprt->reestablish_timeout = 0; 1564 set_bit(XPRT_CLOSING, &xprt->state); 1565 smp_mb__before_atomic(); 1566 clear_bit(XPRT_CONNECTED, &xprt->state); 1567 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1568 smp_mb__after_atomic(); 1569 break; 1570 case TCP_CLOSE_WAIT: 1571 /* The server initiated a shutdown of the socket */ 1572 xprt->connect_cookie++; 1573 clear_bit(XPRT_CONNECTED, &xprt->state); 1574 xs_tcp_force_close(xprt); 1575 case TCP_CLOSING: 1576 /* 1577 * If the server closed down the connection, make sure that 1578 * we back off before reconnecting 1579 */ 1580 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1581 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1582 break; 1583 case TCP_LAST_ACK: 1584 set_bit(XPRT_CLOSING, &xprt->state); 1585 smp_mb__before_atomic(); 1586 clear_bit(XPRT_CONNECTED, &xprt->state); 1587 smp_mb__after_atomic(); 1588 break; 1589 case TCP_CLOSE: 1590 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1591 &transport->sock_state)) 1592 xprt_clear_connecting(xprt); 1593 xs_sock_mark_closed(xprt); 1594 } 1595 out: 1596 read_unlock_bh(&sk->sk_callback_lock); 1597 } 1598 1599 static void xs_write_space(struct sock *sk) 1600 { 1601 struct socket_wq *wq; 1602 struct rpc_xprt *xprt; 1603 1604 if (!sk->sk_socket) 1605 return; 1606 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1607 1608 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1609 return; 1610 rcu_read_lock(); 1611 wq = rcu_dereference(sk->sk_wq); 1612 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) 1613 goto out; 1614 1615 xprt_write_space(xprt); 1616 out: 1617 rcu_read_unlock(); 1618 } 1619 1620 /** 1621 * xs_udp_write_space - callback invoked when socket buffer space 1622 * becomes available 1623 * @sk: socket whose state has changed 1624 * 1625 * Called when more output buffer space is available for this socket. 1626 * We try not to wake our writers until they can make "significant" 1627 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1628 * with a bunch of small requests. 1629 */ 1630 static void xs_udp_write_space(struct sock *sk) 1631 { 1632 read_lock_bh(&sk->sk_callback_lock); 1633 1634 /* from net/core/sock.c:sock_def_write_space */ 1635 if (sock_writeable(sk)) 1636 xs_write_space(sk); 1637 1638 read_unlock_bh(&sk->sk_callback_lock); 1639 } 1640 1641 /** 1642 * xs_tcp_write_space - callback invoked when socket buffer space 1643 * becomes available 1644 * @sk: socket whose state has changed 1645 * 1646 * Called when more output buffer space is available for this socket. 1647 * We try not to wake our writers until they can make "significant" 1648 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1649 * with a bunch of small requests. 1650 */ 1651 static void xs_tcp_write_space(struct sock *sk) 1652 { 1653 read_lock_bh(&sk->sk_callback_lock); 1654 1655 /* from net/core/stream.c:sk_stream_write_space */ 1656 if (sk_stream_is_writeable(sk)) 1657 xs_write_space(sk); 1658 1659 read_unlock_bh(&sk->sk_callback_lock); 1660 } 1661 1662 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1663 { 1664 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1665 struct sock *sk = transport->inet; 1666 1667 if (transport->rcvsize) { 1668 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1669 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1670 } 1671 if (transport->sndsize) { 1672 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1673 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1674 sk->sk_write_space(sk); 1675 } 1676 } 1677 1678 /** 1679 * xs_udp_set_buffer_size - set send and receive limits 1680 * @xprt: generic transport 1681 * @sndsize: requested size of send buffer, in bytes 1682 * @rcvsize: requested size of receive buffer, in bytes 1683 * 1684 * Set socket send and receive buffer size limits. 1685 */ 1686 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1687 { 1688 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1689 1690 transport->sndsize = 0; 1691 if (sndsize) 1692 transport->sndsize = sndsize + 1024; 1693 transport->rcvsize = 0; 1694 if (rcvsize) 1695 transport->rcvsize = rcvsize + 1024; 1696 1697 xs_udp_do_set_buffer_size(xprt); 1698 } 1699 1700 /** 1701 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1702 * @task: task that timed out 1703 * 1704 * Adjust the congestion window after a retransmit timeout has occurred. 1705 */ 1706 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1707 { 1708 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1709 } 1710 1711 static unsigned short xs_get_random_port(void) 1712 { 1713 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1714 unsigned short rand = (unsigned short) prandom_u32() % range; 1715 return rand + xprt_min_resvport; 1716 } 1717 1718 /** 1719 * xs_set_reuseaddr_port - set the socket's port and address reuse options 1720 * @sock: socket 1721 * 1722 * Note that this function has to be called on all sockets that share the 1723 * same port, and it must be called before binding. 1724 */ 1725 static void xs_sock_set_reuseport(struct socket *sock) 1726 { 1727 int opt = 1; 1728 1729 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, 1730 (char *)&opt, sizeof(opt)); 1731 } 1732 1733 static unsigned short xs_sock_getport(struct socket *sock) 1734 { 1735 struct sockaddr_storage buf; 1736 int buflen; 1737 unsigned short port = 0; 1738 1739 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0) 1740 goto out; 1741 switch (buf.ss_family) { 1742 case AF_INET6: 1743 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1744 break; 1745 case AF_INET: 1746 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1747 } 1748 out: 1749 return port; 1750 } 1751 1752 /** 1753 * xs_set_port - reset the port number in the remote endpoint address 1754 * @xprt: generic transport 1755 * @port: new port number 1756 * 1757 */ 1758 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1759 { 1760 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1761 1762 rpc_set_port(xs_addr(xprt), port); 1763 xs_update_peer_port(xprt); 1764 } 1765 1766 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1767 { 1768 if (transport->srcport == 0) 1769 transport->srcport = xs_sock_getport(sock); 1770 } 1771 1772 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1773 { 1774 unsigned short port = transport->srcport; 1775 1776 if (port == 0 && transport->xprt.resvport) 1777 port = xs_get_random_port(); 1778 return port; 1779 } 1780 1781 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1782 { 1783 if (transport->srcport != 0) 1784 transport->srcport = 0; 1785 if (!transport->xprt.resvport) 1786 return 0; 1787 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1788 return xprt_max_resvport; 1789 return --port; 1790 } 1791 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1792 { 1793 struct sockaddr_storage myaddr; 1794 int err, nloop = 0; 1795 unsigned short port = xs_get_srcport(transport); 1796 unsigned short last; 1797 1798 /* 1799 * If we are asking for any ephemeral port (i.e. port == 0 && 1800 * transport->xprt.resvport == 0), don't bind. Let the local 1801 * port selection happen implicitly when the socket is used 1802 * (for example at connect time). 1803 * 1804 * This ensures that we can continue to establish TCP 1805 * connections even when all local ephemeral ports are already 1806 * a part of some TCP connection. This makes no difference 1807 * for UDP sockets, but also doens't harm them. 1808 * 1809 * If we're asking for any reserved port (i.e. port == 0 && 1810 * transport->xprt.resvport == 1) xs_get_srcport above will 1811 * ensure that port is non-zero and we will bind as needed. 1812 */ 1813 if (port == 0) 1814 return 0; 1815 1816 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1817 do { 1818 rpc_set_port((struct sockaddr *)&myaddr, port); 1819 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1820 transport->xprt.addrlen); 1821 if (err == 0) { 1822 transport->srcport = port; 1823 break; 1824 } 1825 last = port; 1826 port = xs_next_srcport(transport, port); 1827 if (port > last) 1828 nloop++; 1829 } while (err == -EADDRINUSE && nloop != 2); 1830 1831 if (myaddr.ss_family == AF_INET) 1832 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1833 &((struct sockaddr_in *)&myaddr)->sin_addr, 1834 port, err ? "failed" : "ok", err); 1835 else 1836 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1837 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1838 port, err ? "failed" : "ok", err); 1839 return err; 1840 } 1841 1842 /* 1843 * We don't support autobind on AF_LOCAL sockets 1844 */ 1845 static void xs_local_rpcbind(struct rpc_task *task) 1846 { 1847 xprt_set_bound(task->tk_xprt); 1848 } 1849 1850 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1851 { 1852 } 1853 1854 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1855 static struct lock_class_key xs_key[2]; 1856 static struct lock_class_key xs_slock_key[2]; 1857 1858 static inline void xs_reclassify_socketu(struct socket *sock) 1859 { 1860 struct sock *sk = sock->sk; 1861 1862 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1863 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1864 } 1865 1866 static inline void xs_reclassify_socket4(struct socket *sock) 1867 { 1868 struct sock *sk = sock->sk; 1869 1870 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1871 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1872 } 1873 1874 static inline void xs_reclassify_socket6(struct socket *sock) 1875 { 1876 struct sock *sk = sock->sk; 1877 1878 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1879 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1880 } 1881 1882 static inline void xs_reclassify_socket(int family, struct socket *sock) 1883 { 1884 WARN_ON_ONCE(sock_owned_by_user(sock->sk)); 1885 if (sock_owned_by_user(sock->sk)) 1886 return; 1887 1888 switch (family) { 1889 case AF_LOCAL: 1890 xs_reclassify_socketu(sock); 1891 break; 1892 case AF_INET: 1893 xs_reclassify_socket4(sock); 1894 break; 1895 case AF_INET6: 1896 xs_reclassify_socket6(sock); 1897 break; 1898 } 1899 } 1900 #else 1901 static inline void xs_reclassify_socket(int family, struct socket *sock) 1902 { 1903 } 1904 #endif 1905 1906 static void xs_dummy_setup_socket(struct work_struct *work) 1907 { 1908 } 1909 1910 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1911 struct sock_xprt *transport, int family, int type, 1912 int protocol, bool reuseport) 1913 { 1914 struct socket *sock; 1915 int err; 1916 1917 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1918 if (err < 0) { 1919 dprintk("RPC: can't create %d transport socket (%d).\n", 1920 protocol, -err); 1921 goto out; 1922 } 1923 xs_reclassify_socket(family, sock); 1924 1925 if (reuseport) 1926 xs_sock_set_reuseport(sock); 1927 1928 err = xs_bind(transport, sock); 1929 if (err) { 1930 sock_release(sock); 1931 goto out; 1932 } 1933 1934 return sock; 1935 out: 1936 return ERR_PTR(err); 1937 } 1938 1939 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1940 struct socket *sock) 1941 { 1942 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1943 xprt); 1944 1945 if (!transport->inet) { 1946 struct sock *sk = sock->sk; 1947 1948 write_lock_bh(&sk->sk_callback_lock); 1949 1950 xs_save_old_callbacks(transport, sk); 1951 1952 sk->sk_user_data = xprt; 1953 sk->sk_data_ready = xs_data_ready; 1954 sk->sk_write_space = xs_udp_write_space; 1955 sk->sk_error_report = xs_error_report; 1956 sk->sk_allocation = GFP_NOIO; 1957 1958 xprt_clear_connected(xprt); 1959 1960 /* Reset to new socket */ 1961 transport->sock = sock; 1962 transport->inet = sk; 1963 1964 write_unlock_bh(&sk->sk_callback_lock); 1965 } 1966 1967 /* Tell the socket layer to start connecting... */ 1968 xprt->stat.connect_count++; 1969 xprt->stat.connect_start = jiffies; 1970 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1971 } 1972 1973 /** 1974 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1975 * @transport: socket transport to connect 1976 */ 1977 static int xs_local_setup_socket(struct sock_xprt *transport) 1978 { 1979 struct rpc_xprt *xprt = &transport->xprt; 1980 struct socket *sock; 1981 int status = -EIO; 1982 1983 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1984 SOCK_STREAM, 0, &sock, 1); 1985 if (status < 0) { 1986 dprintk("RPC: can't create AF_LOCAL " 1987 "transport socket (%d).\n", -status); 1988 goto out; 1989 } 1990 xs_reclassify_socket(AF_LOCAL, sock); 1991 1992 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1993 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1994 1995 status = xs_local_finish_connecting(xprt, sock); 1996 trace_rpc_socket_connect(xprt, sock, status); 1997 switch (status) { 1998 case 0: 1999 dprintk("RPC: xprt %p connected to %s\n", 2000 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2001 xprt_set_connected(xprt); 2002 case -ENOBUFS: 2003 break; 2004 case -ENOENT: 2005 dprintk("RPC: xprt %p: socket %s does not exist\n", 2006 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2007 break; 2008 case -ECONNREFUSED: 2009 dprintk("RPC: xprt %p: connection refused for %s\n", 2010 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2011 break; 2012 default: 2013 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 2014 __func__, -status, 2015 xprt->address_strings[RPC_DISPLAY_ADDR]); 2016 } 2017 2018 out: 2019 xprt_clear_connecting(xprt); 2020 xprt_wake_pending_tasks(xprt, status); 2021 return status; 2022 } 2023 2024 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2025 { 2026 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2027 int ret; 2028 2029 if (RPC_IS_ASYNC(task)) { 2030 /* 2031 * We want the AF_LOCAL connect to be resolved in the 2032 * filesystem namespace of the process making the rpc 2033 * call. Thus we connect synchronously. 2034 * 2035 * If we want to support asynchronous AF_LOCAL calls, 2036 * we'll need to figure out how to pass a namespace to 2037 * connect. 2038 */ 2039 rpc_exit(task, -ENOTCONN); 2040 return; 2041 } 2042 ret = xs_local_setup_socket(transport); 2043 if (ret && !RPC_IS_SOFTCONN(task)) 2044 msleep_interruptible(15000); 2045 } 2046 2047 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 2048 /* 2049 * Note that this should be called with XPRT_LOCKED held (or when we otherwise 2050 * know that we have exclusive access to the socket), to guard against 2051 * races with xs_reset_transport. 2052 */ 2053 static void xs_set_memalloc(struct rpc_xprt *xprt) 2054 { 2055 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2056 xprt); 2057 2058 /* 2059 * If there's no sock, then we have nothing to set. The 2060 * reconnecting process will get it for us. 2061 */ 2062 if (!transport->inet) 2063 return; 2064 if (atomic_read(&xprt->swapper)) 2065 sk_set_memalloc(transport->inet); 2066 } 2067 2068 /** 2069 * xs_enable_swap - Tag this transport as being used for swap. 2070 * @xprt: transport to tag 2071 * 2072 * Take a reference to this transport on behalf of the rpc_clnt, and 2073 * optionally mark it for swapping if it wasn't already. 2074 */ 2075 static int 2076 xs_enable_swap(struct rpc_xprt *xprt) 2077 { 2078 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2079 2080 if (atomic_inc_return(&xprt->swapper) != 1) 2081 return 0; 2082 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2083 return -ERESTARTSYS; 2084 if (xs->inet) 2085 sk_set_memalloc(xs->inet); 2086 xprt_release_xprt(xprt, NULL); 2087 return 0; 2088 } 2089 2090 /** 2091 * xs_disable_swap - Untag this transport as being used for swap. 2092 * @xprt: transport to tag 2093 * 2094 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2095 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2096 */ 2097 static void 2098 xs_disable_swap(struct rpc_xprt *xprt) 2099 { 2100 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2101 2102 if (!atomic_dec_and_test(&xprt->swapper)) 2103 return; 2104 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2105 return; 2106 if (xs->inet) 2107 sk_clear_memalloc(xs->inet); 2108 xprt_release_xprt(xprt, NULL); 2109 } 2110 #else 2111 static void xs_set_memalloc(struct rpc_xprt *xprt) 2112 { 2113 } 2114 2115 static int 2116 xs_enable_swap(struct rpc_xprt *xprt) 2117 { 2118 return -EINVAL; 2119 } 2120 2121 static void 2122 xs_disable_swap(struct rpc_xprt *xprt) 2123 { 2124 } 2125 #endif 2126 2127 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2128 { 2129 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2130 2131 if (!transport->inet) { 2132 struct sock *sk = sock->sk; 2133 2134 write_lock_bh(&sk->sk_callback_lock); 2135 2136 xs_save_old_callbacks(transport, sk); 2137 2138 sk->sk_user_data = xprt; 2139 sk->sk_data_ready = xs_data_ready; 2140 sk->sk_write_space = xs_udp_write_space; 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 sk->sk_error_report = xs_error_report; 2243 sk->sk_allocation = GFP_NOIO; 2244 2245 /* socket options */ 2246 sock_reset_flag(sk, SOCK_LINGER); 2247 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2248 2249 xprt_clear_connected(xprt); 2250 2251 /* Reset to new socket */ 2252 transport->sock = sock; 2253 transport->inet = sk; 2254 2255 write_unlock_bh(&sk->sk_callback_lock); 2256 } 2257 2258 if (!xprt_bound(xprt)) 2259 goto out; 2260 2261 xs_set_memalloc(xprt); 2262 2263 /* Tell the socket layer to start connecting... */ 2264 xprt->stat.connect_count++; 2265 xprt->stat.connect_start = jiffies; 2266 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2267 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2268 switch (ret) { 2269 case 0: 2270 xs_set_srcport(transport, sock); 2271 case -EINPROGRESS: 2272 /* SYN_SENT! */ 2273 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2274 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2275 } 2276 out: 2277 return ret; 2278 } 2279 2280 /** 2281 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2282 * 2283 * Invoked by a work queue tasklet. 2284 */ 2285 static void xs_tcp_setup_socket(struct work_struct *work) 2286 { 2287 struct sock_xprt *transport = 2288 container_of(work, struct sock_xprt, connect_worker.work); 2289 struct socket *sock = transport->sock; 2290 struct rpc_xprt *xprt = &transport->xprt; 2291 int status = -EIO; 2292 2293 if (!sock) { 2294 sock = xs_create_sock(xprt, transport, 2295 xs_addr(xprt)->sa_family, SOCK_STREAM, 2296 IPPROTO_TCP, true); 2297 if (IS_ERR(sock)) { 2298 status = PTR_ERR(sock); 2299 goto out; 2300 } 2301 } 2302 2303 dprintk("RPC: worker connecting xprt %p via %s to " 2304 "%s (port %s)\n", xprt, 2305 xprt->address_strings[RPC_DISPLAY_PROTO], 2306 xprt->address_strings[RPC_DISPLAY_ADDR], 2307 xprt->address_strings[RPC_DISPLAY_PORT]); 2308 2309 status = xs_tcp_finish_connecting(xprt, sock); 2310 trace_rpc_socket_connect(xprt, sock, status); 2311 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2312 xprt, -status, xprt_connected(xprt), 2313 sock->sk->sk_state); 2314 switch (status) { 2315 default: 2316 printk("%s: connect returned unhandled error %d\n", 2317 __func__, status); 2318 case -EADDRNOTAVAIL: 2319 /* We're probably in TIME_WAIT. Get rid of existing socket, 2320 * and retry 2321 */ 2322 xs_tcp_force_close(xprt); 2323 break; 2324 case 0: 2325 case -EINPROGRESS: 2326 case -EALREADY: 2327 xprt_unlock_connect(xprt, transport); 2328 return; 2329 case -EINVAL: 2330 /* Happens, for instance, if the user specified a link 2331 * local IPv6 address without a scope-id. 2332 */ 2333 case -ECONNREFUSED: 2334 case -ECONNRESET: 2335 case -ENETUNREACH: 2336 case -EADDRINUSE: 2337 case -ENOBUFS: 2338 /* retry with existing socket, after a delay */ 2339 xs_tcp_force_close(xprt); 2340 goto out; 2341 } 2342 status = -EAGAIN; 2343 out: 2344 xprt_unlock_connect(xprt, transport); 2345 xprt_clear_connecting(xprt); 2346 xprt_wake_pending_tasks(xprt, status); 2347 } 2348 2349 /** 2350 * xs_connect - connect a socket to a remote endpoint 2351 * @xprt: pointer to transport structure 2352 * @task: address of RPC task that manages state of connect request 2353 * 2354 * TCP: If the remote end dropped the connection, delay reconnecting. 2355 * 2356 * UDP socket connects are synchronous, but we use a work queue anyway 2357 * to guarantee that even unprivileged user processes can set up a 2358 * socket on a privileged port. 2359 * 2360 * If a UDP socket connect fails, the delay behavior here prevents 2361 * retry floods (hard mounts). 2362 */ 2363 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2364 { 2365 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2366 2367 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2368 2369 if (transport->sock != NULL) { 2370 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2371 "seconds\n", 2372 xprt, xprt->reestablish_timeout / HZ); 2373 2374 /* Start by resetting any existing state */ 2375 xs_reset_transport(transport); 2376 2377 queue_delayed_work(rpciod_workqueue, 2378 &transport->connect_worker, 2379 xprt->reestablish_timeout); 2380 xprt->reestablish_timeout <<= 1; 2381 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2382 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2383 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2384 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2385 } else { 2386 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2387 queue_delayed_work(rpciod_workqueue, 2388 &transport->connect_worker, 0); 2389 } 2390 } 2391 2392 /** 2393 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2394 * @xprt: rpc_xprt struct containing statistics 2395 * @seq: output file 2396 * 2397 */ 2398 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2399 { 2400 long idle_time = 0; 2401 2402 if (xprt_connected(xprt)) 2403 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2404 2405 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2406 "%llu %llu %lu %llu %llu\n", 2407 xprt->stat.bind_count, 2408 xprt->stat.connect_count, 2409 xprt->stat.connect_time, 2410 idle_time, 2411 xprt->stat.sends, 2412 xprt->stat.recvs, 2413 xprt->stat.bad_xids, 2414 xprt->stat.req_u, 2415 xprt->stat.bklog_u, 2416 xprt->stat.max_slots, 2417 xprt->stat.sending_u, 2418 xprt->stat.pending_u); 2419 } 2420 2421 /** 2422 * xs_udp_print_stats - display UDP socket-specifc stats 2423 * @xprt: rpc_xprt struct containing statistics 2424 * @seq: output file 2425 * 2426 */ 2427 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2428 { 2429 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2430 2431 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2432 "%lu %llu %llu\n", 2433 transport->srcport, 2434 xprt->stat.bind_count, 2435 xprt->stat.sends, 2436 xprt->stat.recvs, 2437 xprt->stat.bad_xids, 2438 xprt->stat.req_u, 2439 xprt->stat.bklog_u, 2440 xprt->stat.max_slots, 2441 xprt->stat.sending_u, 2442 xprt->stat.pending_u); 2443 } 2444 2445 /** 2446 * xs_tcp_print_stats - display TCP socket-specifc stats 2447 * @xprt: rpc_xprt struct containing statistics 2448 * @seq: output file 2449 * 2450 */ 2451 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2452 { 2453 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2454 long idle_time = 0; 2455 2456 if (xprt_connected(xprt)) 2457 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2458 2459 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2460 "%llu %llu %lu %llu %llu\n", 2461 transport->srcport, 2462 xprt->stat.bind_count, 2463 xprt->stat.connect_count, 2464 xprt->stat.connect_time, 2465 idle_time, 2466 xprt->stat.sends, 2467 xprt->stat.recvs, 2468 xprt->stat.bad_xids, 2469 xprt->stat.req_u, 2470 xprt->stat.bklog_u, 2471 xprt->stat.max_slots, 2472 xprt->stat.sending_u, 2473 xprt->stat.pending_u); 2474 } 2475 2476 /* 2477 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2478 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2479 * to use the server side send routines. 2480 */ 2481 static void *bc_malloc(struct rpc_task *task, size_t size) 2482 { 2483 struct page *page; 2484 struct rpc_buffer *buf; 2485 2486 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2487 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) 2488 return NULL; 2489 2490 page = alloc_page(GFP_KERNEL); 2491 if (!page) 2492 return NULL; 2493 2494 buf = page_address(page); 2495 buf->len = PAGE_SIZE; 2496 2497 return buf->data; 2498 } 2499 2500 /* 2501 * Free the space allocated in the bc_alloc routine 2502 */ 2503 static void bc_free(void *buffer) 2504 { 2505 struct rpc_buffer *buf; 2506 2507 if (!buffer) 2508 return; 2509 2510 buf = container_of(buffer, struct rpc_buffer, data); 2511 free_page((unsigned long)buf); 2512 } 2513 2514 /* 2515 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2516 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2517 */ 2518 static int bc_sendto(struct rpc_rqst *req) 2519 { 2520 int len; 2521 struct xdr_buf *xbufp = &req->rq_snd_buf; 2522 struct rpc_xprt *xprt = req->rq_xprt; 2523 struct sock_xprt *transport = 2524 container_of(xprt, struct sock_xprt, xprt); 2525 struct socket *sock = transport->sock; 2526 unsigned long headoff; 2527 unsigned long tailoff; 2528 2529 xs_encode_stream_record_marker(xbufp); 2530 2531 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2532 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2533 len = svc_send_common(sock, xbufp, 2534 virt_to_page(xbufp->head[0].iov_base), headoff, 2535 xbufp->tail[0].iov_base, tailoff); 2536 2537 if (len != xbufp->len) { 2538 printk(KERN_NOTICE "Error sending entire callback!\n"); 2539 len = -EAGAIN; 2540 } 2541 2542 return len; 2543 } 2544 2545 /* 2546 * The send routine. Borrows from svc_send 2547 */ 2548 static int bc_send_request(struct rpc_task *task) 2549 { 2550 struct rpc_rqst *req = task->tk_rqstp; 2551 struct svc_xprt *xprt; 2552 int len; 2553 2554 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2555 /* 2556 * Get the server socket associated with this callback xprt 2557 */ 2558 xprt = req->rq_xprt->bc_xprt; 2559 2560 /* 2561 * Grab the mutex to serialize data as the connection is shared 2562 * with the fore channel 2563 */ 2564 if (!mutex_trylock(&xprt->xpt_mutex)) { 2565 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2566 if (!mutex_trylock(&xprt->xpt_mutex)) 2567 return -EAGAIN; 2568 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2569 } 2570 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2571 len = -ENOTCONN; 2572 else 2573 len = bc_sendto(req); 2574 mutex_unlock(&xprt->xpt_mutex); 2575 2576 if (len > 0) 2577 len = 0; 2578 2579 return len; 2580 } 2581 2582 /* 2583 * The close routine. Since this is client initiated, we do nothing 2584 */ 2585 2586 static void bc_close(struct rpc_xprt *xprt) 2587 { 2588 } 2589 2590 /* 2591 * The xprt destroy routine. Again, because this connection is client 2592 * initiated, we do nothing 2593 */ 2594 2595 static void bc_destroy(struct rpc_xprt *xprt) 2596 { 2597 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2598 2599 xs_xprt_free(xprt); 2600 module_put(THIS_MODULE); 2601 } 2602 2603 static struct rpc_xprt_ops xs_local_ops = { 2604 .reserve_xprt = xprt_reserve_xprt, 2605 .release_xprt = xs_tcp_release_xprt, 2606 .alloc_slot = xprt_alloc_slot, 2607 .rpcbind = xs_local_rpcbind, 2608 .set_port = xs_local_set_port, 2609 .connect = xs_local_connect, 2610 .buf_alloc = rpc_malloc, 2611 .buf_free = rpc_free, 2612 .send_request = xs_local_send_request, 2613 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2614 .close = xs_close, 2615 .destroy = xs_destroy, 2616 .print_stats = xs_local_print_stats, 2617 .enable_swap = xs_enable_swap, 2618 .disable_swap = xs_disable_swap, 2619 }; 2620 2621 static struct rpc_xprt_ops xs_udp_ops = { 2622 .set_buffer_size = xs_udp_set_buffer_size, 2623 .reserve_xprt = xprt_reserve_xprt_cong, 2624 .release_xprt = xprt_release_xprt_cong, 2625 .alloc_slot = xprt_alloc_slot, 2626 .rpcbind = rpcb_getport_async, 2627 .set_port = xs_set_port, 2628 .connect = xs_connect, 2629 .buf_alloc = rpc_malloc, 2630 .buf_free = rpc_free, 2631 .send_request = xs_udp_send_request, 2632 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2633 .timer = xs_udp_timer, 2634 .release_request = xprt_release_rqst_cong, 2635 .close = xs_close, 2636 .destroy = xs_destroy, 2637 .print_stats = xs_udp_print_stats, 2638 .enable_swap = xs_enable_swap, 2639 .disable_swap = xs_disable_swap, 2640 .inject_disconnect = xs_inject_disconnect, 2641 }; 2642 2643 static struct rpc_xprt_ops xs_tcp_ops = { 2644 .reserve_xprt = xprt_reserve_xprt, 2645 .release_xprt = xs_tcp_release_xprt, 2646 .alloc_slot = xprt_lock_and_alloc_slot, 2647 .rpcbind = rpcb_getport_async, 2648 .set_port = xs_set_port, 2649 .connect = xs_connect, 2650 .buf_alloc = rpc_malloc, 2651 .buf_free = rpc_free, 2652 .send_request = xs_tcp_send_request, 2653 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2654 .close = xs_tcp_shutdown, 2655 .destroy = xs_destroy, 2656 .print_stats = xs_tcp_print_stats, 2657 .enable_swap = xs_enable_swap, 2658 .disable_swap = xs_disable_swap, 2659 .inject_disconnect = xs_inject_disconnect, 2660 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2661 .bc_setup = xprt_setup_bc, 2662 .bc_up = xs_tcp_bc_up, 2663 .bc_free_rqst = xprt_free_bc_rqst, 2664 .bc_destroy = xprt_destroy_bc, 2665 #endif 2666 }; 2667 2668 /* 2669 * The rpc_xprt_ops for the server backchannel 2670 */ 2671 2672 static struct rpc_xprt_ops bc_tcp_ops = { 2673 .reserve_xprt = xprt_reserve_xprt, 2674 .release_xprt = xprt_release_xprt, 2675 .alloc_slot = xprt_alloc_slot, 2676 .buf_alloc = bc_malloc, 2677 .buf_free = bc_free, 2678 .send_request = bc_send_request, 2679 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2680 .close = bc_close, 2681 .destroy = bc_destroy, 2682 .print_stats = xs_tcp_print_stats, 2683 .enable_swap = xs_enable_swap, 2684 .disable_swap = xs_disable_swap, 2685 .inject_disconnect = xs_inject_disconnect, 2686 }; 2687 2688 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2689 { 2690 static const struct sockaddr_in sin = { 2691 .sin_family = AF_INET, 2692 .sin_addr.s_addr = htonl(INADDR_ANY), 2693 }; 2694 static const struct sockaddr_in6 sin6 = { 2695 .sin6_family = AF_INET6, 2696 .sin6_addr = IN6ADDR_ANY_INIT, 2697 }; 2698 2699 switch (family) { 2700 case AF_LOCAL: 2701 break; 2702 case AF_INET: 2703 memcpy(sap, &sin, sizeof(sin)); 2704 break; 2705 case AF_INET6: 2706 memcpy(sap, &sin6, sizeof(sin6)); 2707 break; 2708 default: 2709 dprintk("RPC: %s: Bad address family\n", __func__); 2710 return -EAFNOSUPPORT; 2711 } 2712 return 0; 2713 } 2714 2715 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2716 unsigned int slot_table_size, 2717 unsigned int max_slot_table_size) 2718 { 2719 struct rpc_xprt *xprt; 2720 struct sock_xprt *new; 2721 2722 if (args->addrlen > sizeof(xprt->addr)) { 2723 dprintk("RPC: xs_setup_xprt: address too large\n"); 2724 return ERR_PTR(-EBADF); 2725 } 2726 2727 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2728 max_slot_table_size); 2729 if (xprt == NULL) { 2730 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2731 "rpc_xprt\n"); 2732 return ERR_PTR(-ENOMEM); 2733 } 2734 2735 new = container_of(xprt, struct sock_xprt, xprt); 2736 mutex_init(&new->recv_mutex); 2737 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2738 xprt->addrlen = args->addrlen; 2739 if (args->srcaddr) 2740 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2741 else { 2742 int err; 2743 err = xs_init_anyaddr(args->dstaddr->sa_family, 2744 (struct sockaddr *)&new->srcaddr); 2745 if (err != 0) { 2746 xprt_free(xprt); 2747 return ERR_PTR(err); 2748 } 2749 } 2750 2751 return xprt; 2752 } 2753 2754 static const struct rpc_timeout xs_local_default_timeout = { 2755 .to_initval = 10 * HZ, 2756 .to_maxval = 10 * HZ, 2757 .to_retries = 2, 2758 }; 2759 2760 /** 2761 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2762 * @args: rpc transport creation arguments 2763 * 2764 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2765 */ 2766 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2767 { 2768 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2769 struct sock_xprt *transport; 2770 struct rpc_xprt *xprt; 2771 struct rpc_xprt *ret; 2772 2773 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2774 xprt_max_tcp_slot_table_entries); 2775 if (IS_ERR(xprt)) 2776 return xprt; 2777 transport = container_of(xprt, struct sock_xprt, xprt); 2778 2779 xprt->prot = 0; 2780 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2781 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2782 2783 xprt->bind_timeout = XS_BIND_TO; 2784 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2785 xprt->idle_timeout = XS_IDLE_DISC_TO; 2786 2787 xprt->ops = &xs_local_ops; 2788 xprt->timeout = &xs_local_default_timeout; 2789 2790 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn); 2791 INIT_DELAYED_WORK(&transport->connect_worker, 2792 xs_dummy_setup_socket); 2793 2794 switch (sun->sun_family) { 2795 case AF_LOCAL: 2796 if (sun->sun_path[0] != '/') { 2797 dprintk("RPC: bad AF_LOCAL address: %s\n", 2798 sun->sun_path); 2799 ret = ERR_PTR(-EINVAL); 2800 goto out_err; 2801 } 2802 xprt_set_bound(xprt); 2803 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2804 ret = ERR_PTR(xs_local_setup_socket(transport)); 2805 if (ret) 2806 goto out_err; 2807 break; 2808 default: 2809 ret = ERR_PTR(-EAFNOSUPPORT); 2810 goto out_err; 2811 } 2812 2813 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2814 xprt->address_strings[RPC_DISPLAY_ADDR]); 2815 2816 if (try_module_get(THIS_MODULE)) 2817 return xprt; 2818 ret = ERR_PTR(-EINVAL); 2819 out_err: 2820 xs_xprt_free(xprt); 2821 return ret; 2822 } 2823 2824 static const struct rpc_timeout xs_udp_default_timeout = { 2825 .to_initval = 5 * HZ, 2826 .to_maxval = 30 * HZ, 2827 .to_increment = 5 * HZ, 2828 .to_retries = 5, 2829 }; 2830 2831 /** 2832 * xs_setup_udp - Set up transport to use a UDP socket 2833 * @args: rpc transport creation arguments 2834 * 2835 */ 2836 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2837 { 2838 struct sockaddr *addr = args->dstaddr; 2839 struct rpc_xprt *xprt; 2840 struct sock_xprt *transport; 2841 struct rpc_xprt *ret; 2842 2843 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2844 xprt_udp_slot_table_entries); 2845 if (IS_ERR(xprt)) 2846 return xprt; 2847 transport = container_of(xprt, struct sock_xprt, xprt); 2848 2849 xprt->prot = IPPROTO_UDP; 2850 xprt->tsh_size = 0; 2851 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2852 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2853 2854 xprt->bind_timeout = XS_BIND_TO; 2855 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2856 xprt->idle_timeout = XS_IDLE_DISC_TO; 2857 2858 xprt->ops = &xs_udp_ops; 2859 2860 xprt->timeout = &xs_udp_default_timeout; 2861 2862 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2863 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 2864 2865 switch (addr->sa_family) { 2866 case AF_INET: 2867 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2868 xprt_set_bound(xprt); 2869 2870 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2871 break; 2872 case AF_INET6: 2873 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2874 xprt_set_bound(xprt); 2875 2876 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2877 break; 2878 default: 2879 ret = ERR_PTR(-EAFNOSUPPORT); 2880 goto out_err; 2881 } 2882 2883 if (xprt_bound(xprt)) 2884 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2885 xprt->address_strings[RPC_DISPLAY_ADDR], 2886 xprt->address_strings[RPC_DISPLAY_PORT], 2887 xprt->address_strings[RPC_DISPLAY_PROTO]); 2888 else 2889 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2890 xprt->address_strings[RPC_DISPLAY_ADDR], 2891 xprt->address_strings[RPC_DISPLAY_PROTO]); 2892 2893 if (try_module_get(THIS_MODULE)) 2894 return xprt; 2895 ret = ERR_PTR(-EINVAL); 2896 out_err: 2897 xs_xprt_free(xprt); 2898 return ret; 2899 } 2900 2901 static const struct rpc_timeout xs_tcp_default_timeout = { 2902 .to_initval = 60 * HZ, 2903 .to_maxval = 60 * HZ, 2904 .to_retries = 2, 2905 }; 2906 2907 /** 2908 * xs_setup_tcp - Set up transport to use a TCP socket 2909 * @args: rpc transport creation arguments 2910 * 2911 */ 2912 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2913 { 2914 struct sockaddr *addr = args->dstaddr; 2915 struct rpc_xprt *xprt; 2916 struct sock_xprt *transport; 2917 struct rpc_xprt *ret; 2918 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2919 2920 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2921 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2922 2923 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2924 max_slot_table_size); 2925 if (IS_ERR(xprt)) 2926 return xprt; 2927 transport = container_of(xprt, struct sock_xprt, xprt); 2928 2929 xprt->prot = IPPROTO_TCP; 2930 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2931 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2932 2933 xprt->bind_timeout = XS_BIND_TO; 2934 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2935 xprt->idle_timeout = XS_IDLE_DISC_TO; 2936 2937 xprt->ops = &xs_tcp_ops; 2938 xprt->timeout = &xs_tcp_default_timeout; 2939 2940 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn); 2941 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 2942 2943 switch (addr->sa_family) { 2944 case AF_INET: 2945 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2946 xprt_set_bound(xprt); 2947 2948 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2949 break; 2950 case AF_INET6: 2951 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2952 xprt_set_bound(xprt); 2953 2954 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2955 break; 2956 default: 2957 ret = ERR_PTR(-EAFNOSUPPORT); 2958 goto out_err; 2959 } 2960 2961 if (xprt_bound(xprt)) 2962 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2963 xprt->address_strings[RPC_DISPLAY_ADDR], 2964 xprt->address_strings[RPC_DISPLAY_PORT], 2965 xprt->address_strings[RPC_DISPLAY_PROTO]); 2966 else 2967 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2968 xprt->address_strings[RPC_DISPLAY_ADDR], 2969 xprt->address_strings[RPC_DISPLAY_PROTO]); 2970 2971 if (try_module_get(THIS_MODULE)) 2972 return xprt; 2973 ret = ERR_PTR(-EINVAL); 2974 out_err: 2975 xs_xprt_free(xprt); 2976 return ret; 2977 } 2978 2979 /** 2980 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2981 * @args: rpc transport creation arguments 2982 * 2983 */ 2984 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2985 { 2986 struct sockaddr *addr = args->dstaddr; 2987 struct rpc_xprt *xprt; 2988 struct sock_xprt *transport; 2989 struct svc_sock *bc_sock; 2990 struct rpc_xprt *ret; 2991 2992 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2993 xprt_tcp_slot_table_entries); 2994 if (IS_ERR(xprt)) 2995 return xprt; 2996 transport = container_of(xprt, struct sock_xprt, xprt); 2997 2998 xprt->prot = IPPROTO_TCP; 2999 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 3000 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3001 xprt->timeout = &xs_tcp_default_timeout; 3002 3003 /* backchannel */ 3004 xprt_set_bound(xprt); 3005 xprt->bind_timeout = 0; 3006 xprt->reestablish_timeout = 0; 3007 xprt->idle_timeout = 0; 3008 3009 xprt->ops = &bc_tcp_ops; 3010 3011 switch (addr->sa_family) { 3012 case AF_INET: 3013 xs_format_peer_addresses(xprt, "tcp", 3014 RPCBIND_NETID_TCP); 3015 break; 3016 case AF_INET6: 3017 xs_format_peer_addresses(xprt, "tcp", 3018 RPCBIND_NETID_TCP6); 3019 break; 3020 default: 3021 ret = ERR_PTR(-EAFNOSUPPORT); 3022 goto out_err; 3023 } 3024 3025 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3026 xprt->address_strings[RPC_DISPLAY_ADDR], 3027 xprt->address_strings[RPC_DISPLAY_PORT], 3028 xprt->address_strings[RPC_DISPLAY_PROTO]); 3029 3030 /* 3031 * Once we've associated a backchannel xprt with a connection, 3032 * we want to keep it around as long as the connection lasts, 3033 * in case we need to start using it for a backchannel again; 3034 * this reference won't be dropped until bc_xprt is destroyed. 3035 */ 3036 xprt_get(xprt); 3037 args->bc_xprt->xpt_bc_xprt = xprt; 3038 xprt->bc_xprt = args->bc_xprt; 3039 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3040 transport->sock = bc_sock->sk_sock; 3041 transport->inet = bc_sock->sk_sk; 3042 3043 /* 3044 * Since we don't want connections for the backchannel, we set 3045 * the xprt status to connected 3046 */ 3047 xprt_set_connected(xprt); 3048 3049 if (try_module_get(THIS_MODULE)) 3050 return xprt; 3051 3052 args->bc_xprt->xpt_bc_xprt = NULL; 3053 xprt_put(xprt); 3054 ret = ERR_PTR(-EINVAL); 3055 out_err: 3056 xs_xprt_free(xprt); 3057 return ret; 3058 } 3059 3060 static struct xprt_class xs_local_transport = { 3061 .list = LIST_HEAD_INIT(xs_local_transport.list), 3062 .name = "named UNIX socket", 3063 .owner = THIS_MODULE, 3064 .ident = XPRT_TRANSPORT_LOCAL, 3065 .setup = xs_setup_local, 3066 }; 3067 3068 static struct xprt_class xs_udp_transport = { 3069 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3070 .name = "udp", 3071 .owner = THIS_MODULE, 3072 .ident = XPRT_TRANSPORT_UDP, 3073 .setup = xs_setup_udp, 3074 }; 3075 3076 static struct xprt_class xs_tcp_transport = { 3077 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3078 .name = "tcp", 3079 .owner = THIS_MODULE, 3080 .ident = XPRT_TRANSPORT_TCP, 3081 .setup = xs_setup_tcp, 3082 }; 3083 3084 static struct xprt_class xs_bc_tcp_transport = { 3085 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3086 .name = "tcp NFSv4.1 backchannel", 3087 .owner = THIS_MODULE, 3088 .ident = XPRT_TRANSPORT_BC_TCP, 3089 .setup = xs_setup_bc_tcp, 3090 }; 3091 3092 /** 3093 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3094 * 3095 */ 3096 int init_socket_xprt(void) 3097 { 3098 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3099 if (!sunrpc_table_header) 3100 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3101 #endif 3102 3103 xprt_register_transport(&xs_local_transport); 3104 xprt_register_transport(&xs_udp_transport); 3105 xprt_register_transport(&xs_tcp_transport); 3106 xprt_register_transport(&xs_bc_tcp_transport); 3107 3108 return 0; 3109 } 3110 3111 /** 3112 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3113 * 3114 */ 3115 void cleanup_socket_xprt(void) 3116 { 3117 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 3118 if (sunrpc_table_header) { 3119 unregister_sysctl_table(sunrpc_table_header); 3120 sunrpc_table_header = NULL; 3121 } 3122 #endif 3123 3124 xprt_unregister_transport(&xs_local_transport); 3125 xprt_unregister_transport(&xs_udp_transport); 3126 xprt_unregister_transport(&xs_tcp_transport); 3127 xprt_unregister_transport(&xs_bc_tcp_transport); 3128 } 3129 3130 static int param_set_uint_minmax(const char *val, 3131 const struct kernel_param *kp, 3132 unsigned int min, unsigned int max) 3133 { 3134 unsigned int num; 3135 int ret; 3136 3137 if (!val) 3138 return -EINVAL; 3139 ret = kstrtouint(val, 0, &num); 3140 if (ret == -EINVAL || num < min || num > max) 3141 return -EINVAL; 3142 *((unsigned int *)kp->arg) = num; 3143 return 0; 3144 } 3145 3146 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3147 { 3148 return param_set_uint_minmax(val, kp, 3149 RPC_MIN_RESVPORT, 3150 RPC_MAX_RESVPORT); 3151 } 3152 3153 static const struct kernel_param_ops param_ops_portnr = { 3154 .set = param_set_portnr, 3155 .get = param_get_uint, 3156 }; 3157 3158 #define param_check_portnr(name, p) \ 3159 __param_check(name, p, unsigned int); 3160 3161 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3162 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3163 3164 static int param_set_slot_table_size(const char *val, 3165 const struct kernel_param *kp) 3166 { 3167 return param_set_uint_minmax(val, kp, 3168 RPC_MIN_SLOT_TABLE, 3169 RPC_MAX_SLOT_TABLE); 3170 } 3171 3172 static const struct kernel_param_ops param_ops_slot_table_size = { 3173 .set = param_set_slot_table_size, 3174 .get = param_get_uint, 3175 }; 3176 3177 #define param_check_slot_table_size(name, p) \ 3178 __param_check(name, p, unsigned int); 3179 3180 static int param_set_max_slot_table_size(const char *val, 3181 const struct kernel_param *kp) 3182 { 3183 return param_set_uint_minmax(val, kp, 3184 RPC_MIN_SLOT_TABLE, 3185 RPC_MAX_SLOT_TABLE_LIMIT); 3186 } 3187 3188 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3189 .set = param_set_max_slot_table_size, 3190 .get = param_get_uint, 3191 }; 3192 3193 #define param_check_max_slot_table_size(name, p) \ 3194 __param_check(name, p, unsigned int); 3195 3196 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3197 slot_table_size, 0644); 3198 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3199 max_slot_table_size, 0644); 3200 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3201 slot_table_size, 0644); 3202 3203