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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
54static void xs_close(struct rpc_xprt *xprt);
55
56/*
57 * xprtsock tunables
58 */
59static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
62
63static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64static 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)
69static 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
80static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
82static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
83static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
85
86static 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 */
92static 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
148static 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
195static 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
213static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
214{
215 /* NOP */
216}
217#endif
218
219static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
220{
221 return (struct rpc_xprt *) sk->sk_user_data;
222}
223
224static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
225{
226 return (struct sockaddr *) &xprt->addr;
227}
228
229static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
230{
231 return (struct sockaddr_un *) &xprt->addr;
232}
233
234static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
235{
236 return (struct sockaddr_in *) &xprt->addr;
237}
238
239static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
240{
241 return (struct sockaddr_in6 *) &xprt->addr;
242}
243
244static 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
280static 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
292static 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
302static 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
310static 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
326static 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
343static 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 */
392static 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);
431out:
432 if (err > 0) {
433 *sent_p += err;
434 err = 0;
435 }
436 return err;
437}
438
439static 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 */
451static 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 */
484static 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 */
502static 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 */
563static 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
599process_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 */
638static 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 */
722static 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);
738out_release:
739 xprt_release_xprt(xprt, task);
740}
741
742static 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
750static 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
758static 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
766static 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 */
780static 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
803static 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 */
844static 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
856static 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
863static 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 */
874static 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
887static 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 */
910static 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
953static 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 }
970out:
971 mutex_unlock(&transport->recv_mutex);
972}
973
974static 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 */
988static 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
1035static 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 }
1052out:
1053 mutex_unlock(&transport->recv_mutex);
1054}
1055
1056static 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 */
1068static 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 */
1087static void xs_tcp_force_close(struct rpc_xprt *xprt)
1088{
1089 xprt_force_disconnect(xprt);
1090}
1091
1092static 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
1125static 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
1138static 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
1160static 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
1204static 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 */
1284static 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 */
1320static 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
1347static 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
1358static 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
1369static 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 */
1380static 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
1397static 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
1411static 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
1453static 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 }
1479out:
1480 mutex_unlock(&transport->recv_mutex);
1481 trace_xs_tcp_data_ready(xprt, read, total);
1482}
1483
1484static 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 */
1496static 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
1515out:
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 */
1524static 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
1599static 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);
1616out:
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 */
1630static 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 */
1651static 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
1662static 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 */
1686static 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 */
1706static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1707{
1708 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1709}
1710
1711static 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 */
1725static 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
1733static 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 }
1748out:
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 */
1758static 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
1766static 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
1772static 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
1781static 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}
1791static 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 */
1845static void xs_local_rpcbind(struct rpc_task *task)
1846{
1847 xprt_set_bound(task->tk_xprt);
1848}
1849
1850static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1851{
1852}
1853
1854#ifdef CONFIG_DEBUG_LOCK_ALLOC
1855static struct lock_class_key xs_key[2];
1856static struct lock_class_key xs_slock_key[2];
1857
1858static 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
1866static 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
1874static 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
1882static 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
1901static inline void xs_reclassify_socket(int family, struct socket *sock)
1902{
1903}
1904#endif
1905
1906static void xs_dummy_setup_socket(struct work_struct *work)
1907{
1908}
1909
1910static 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;
1935out:
1936 return ERR_PTR(err);
1937}
1938
1939static 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 */
1977static 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
2018out:
2019 xprt_clear_connecting(xprt);
2020 xprt_wake_pending_tasks(xprt, status);
2021 return status;
2022}
2023
2024static 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 */
2053static 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 */
2075static int
2076xs_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 */
2097static void
2098xs_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
2111static void xs_set_memalloc(struct rpc_xprt *xprt)
2112{
2113}
2114
2115static int
2116xs_enable_swap(struct rpc_xprt *xprt)
2117{
2118 return -EINVAL;
2119}
2120
2121static void
2122xs_disable_swap(struct rpc_xprt *xprt)
2123{
2124}
2125#endif
2126
2127static 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
2156static 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;
2179out:
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 */
2192static 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
2206static 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 }
2276out:
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 */
2285static 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;
2343out:
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 */
2363static 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 */
2398static 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 */
2427static 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 */
2451static 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 */
2481static 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 */
2503static 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 */
2518static 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 */
2548static 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
2586static 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
2595static 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
2603static 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
2621static 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
2643static 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
2672static 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
2688static 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
2715static 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
2754static 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 */
2766static 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);
2819out_err:
2820 xs_xprt_free(xprt);
2821 return ret;
2822}
2823
2824static 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 */
2836static 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);
2896out_err:
2897 xs_xprt_free(xprt);
2898 return ret;
2899}
2900
2901static 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 */
2912static 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);
2974out_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 */
2984static 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);
3055out_err:
3056 xs_xprt_free(xprt);
3057 return ret;
3058}
3059
3060static 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
3068static 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
3076static 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
3084static 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 */
3096int 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 */
3115void 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
3130static 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
3146static 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
3153static 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
3161module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3162module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3163
3164static 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
3172static 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
3180static 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
3188static 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
3196module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3197 slot_table_size, 0644);
3198module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3199 max_slot_table_size, 0644);
3200module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3201 slot_table_size, 0644);
3202
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/net/sunrpc/xprtsock.c
4 *
5 * Client-side transport implementation for sockets.
6 *
7 * TCP callback races fixes (C) 1998 Red Hat
8 * TCP send fixes (C) 1998 Red Hat
9 * TCP NFS related read + write fixes
10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11 *
12 * Rewrite of larges part of the code in order to stabilize TCP stuff.
13 * Fix behaviour when socket buffer is full.
14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15 *
16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
17 *
18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
19 * <gilles.quillard@bull.net>
20 */
21
22#include <linux/types.h>
23#include <linux/string.h>
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/capability.h>
27#include <linux/pagemap.h>
28#include <linux/errno.h>
29#include <linux/socket.h>
30#include <linux/in.h>
31#include <linux/net.h>
32#include <linux/mm.h>
33#include <linux/un.h>
34#include <linux/udp.h>
35#include <linux/tcp.h>
36#include <linux/sunrpc/clnt.h>
37#include <linux/sunrpc/addr.h>
38#include <linux/sunrpc/sched.h>
39#include <linux/sunrpc/svcsock.h>
40#include <linux/sunrpc/xprtsock.h>
41#include <linux/file.h>
42#ifdef CONFIG_SUNRPC_BACKCHANNEL
43#include <linux/sunrpc/bc_xprt.h>
44#endif
45
46#include <net/sock.h>
47#include <net/checksum.h>
48#include <net/udp.h>
49#include <net/tcp.h>
50#include <linux/bvec.h>
51#include <linux/highmem.h>
52#include <linux/uio.h>
53#include <linux/sched/mm.h>
54
55#include <trace/events/sunrpc.h>
56
57#include "socklib.h"
58#include "sunrpc.h"
59
60static void xs_close(struct rpc_xprt *xprt);
61static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
62 struct socket *sock);
63
64/*
65 * xprtsock tunables
66 */
67static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
68static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
69static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
70
71static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
72static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
73
74#define XS_TCP_LINGER_TO (15U * HZ)
75static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
76
77/*
78 * We can register our own files under /proc/sys/sunrpc by
79 * calling register_sysctl_table() again. The files in that
80 * directory become the union of all files registered there.
81 *
82 * We simply need to make sure that we don't collide with
83 * someone else's file names!
84 */
85
86static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
87static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
88static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
89static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
90static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
91
92static struct ctl_table_header *sunrpc_table_header;
93
94static struct xprt_class xs_local_transport;
95static struct xprt_class xs_udp_transport;
96static struct xprt_class xs_tcp_transport;
97static struct xprt_class xs_bc_tcp_transport;
98
99/*
100 * FIXME: changing the UDP slot table size should also resize the UDP
101 * socket buffers for existing UDP transports
102 */
103static struct ctl_table xs_tunables_table[] = {
104 {
105 .procname = "udp_slot_table_entries",
106 .data = &xprt_udp_slot_table_entries,
107 .maxlen = sizeof(unsigned int),
108 .mode = 0644,
109 .proc_handler = proc_dointvec_minmax,
110 .extra1 = &min_slot_table_size,
111 .extra2 = &max_slot_table_size
112 },
113 {
114 .procname = "tcp_slot_table_entries",
115 .data = &xprt_tcp_slot_table_entries,
116 .maxlen = sizeof(unsigned int),
117 .mode = 0644,
118 .proc_handler = proc_dointvec_minmax,
119 .extra1 = &min_slot_table_size,
120 .extra2 = &max_slot_table_size
121 },
122 {
123 .procname = "tcp_max_slot_table_entries",
124 .data = &xprt_max_tcp_slot_table_entries,
125 .maxlen = sizeof(unsigned int),
126 .mode = 0644,
127 .proc_handler = proc_dointvec_minmax,
128 .extra1 = &min_slot_table_size,
129 .extra2 = &max_tcp_slot_table_limit
130 },
131 {
132 .procname = "min_resvport",
133 .data = &xprt_min_resvport,
134 .maxlen = sizeof(unsigned int),
135 .mode = 0644,
136 .proc_handler = proc_dointvec_minmax,
137 .extra1 = &xprt_min_resvport_limit,
138 .extra2 = &xprt_max_resvport_limit
139 },
140 {
141 .procname = "max_resvport",
142 .data = &xprt_max_resvport,
143 .maxlen = sizeof(unsigned int),
144 .mode = 0644,
145 .proc_handler = proc_dointvec_minmax,
146 .extra1 = &xprt_min_resvport_limit,
147 .extra2 = &xprt_max_resvport_limit
148 },
149 {
150 .procname = "tcp_fin_timeout",
151 .data = &xs_tcp_fin_timeout,
152 .maxlen = sizeof(xs_tcp_fin_timeout),
153 .mode = 0644,
154 .proc_handler = proc_dointvec_jiffies,
155 },
156 { },
157};
158
159static struct ctl_table sunrpc_table[] = {
160 {
161 .procname = "sunrpc",
162 .mode = 0555,
163 .child = xs_tunables_table
164 },
165 { },
166};
167
168/*
169 * Wait duration for a reply from the RPC portmapper.
170 */
171#define XS_BIND_TO (60U * HZ)
172
173/*
174 * Delay if a UDP socket connect error occurs. This is most likely some
175 * kind of resource problem on the local host.
176 */
177#define XS_UDP_REEST_TO (2U * HZ)
178
179/*
180 * The reestablish timeout allows clients to delay for a bit before attempting
181 * to reconnect to a server that just dropped our connection.
182 *
183 * We implement an exponential backoff when trying to reestablish a TCP
184 * transport connection with the server. Some servers like to drop a TCP
185 * connection when they are overworked, so we start with a short timeout and
186 * increase over time if the server is down or not responding.
187 */
188#define XS_TCP_INIT_REEST_TO (3U * HZ)
189
190/*
191 * TCP idle timeout; client drops the transport socket if it is idle
192 * for this long. Note that we also timeout UDP sockets to prevent
193 * holding port numbers when there is no RPC traffic.
194 */
195#define XS_IDLE_DISC_TO (5U * 60 * HZ)
196
197#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
198# undef RPC_DEBUG_DATA
199# define RPCDBG_FACILITY RPCDBG_TRANS
200#endif
201
202#ifdef RPC_DEBUG_DATA
203static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
204{
205 u8 *buf = (u8 *) packet;
206 int j;
207
208 dprintk("RPC: %s\n", msg);
209 for (j = 0; j < count && j < 128; j += 4) {
210 if (!(j & 31)) {
211 if (j)
212 dprintk("\n");
213 dprintk("0x%04x ", j);
214 }
215 dprintk("%02x%02x%02x%02x ",
216 buf[j], buf[j+1], buf[j+2], buf[j+3]);
217 }
218 dprintk("\n");
219}
220#else
221static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
222{
223 /* NOP */
224}
225#endif
226
227static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
228{
229 return (struct rpc_xprt *) sk->sk_user_data;
230}
231
232static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
233{
234 return (struct sockaddr *) &xprt->addr;
235}
236
237static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
238{
239 return (struct sockaddr_un *) &xprt->addr;
240}
241
242static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
243{
244 return (struct sockaddr_in *) &xprt->addr;
245}
246
247static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
248{
249 return (struct sockaddr_in6 *) &xprt->addr;
250}
251
252static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
253{
254 struct sockaddr *sap = xs_addr(xprt);
255 struct sockaddr_in6 *sin6;
256 struct sockaddr_in *sin;
257 struct sockaddr_un *sun;
258 char buf[128];
259
260 switch (sap->sa_family) {
261 case AF_LOCAL:
262 sun = xs_addr_un(xprt);
263 strlcpy(buf, sun->sun_path, sizeof(buf));
264 xprt->address_strings[RPC_DISPLAY_ADDR] =
265 kstrdup(buf, GFP_KERNEL);
266 break;
267 case AF_INET:
268 (void)rpc_ntop(sap, buf, sizeof(buf));
269 xprt->address_strings[RPC_DISPLAY_ADDR] =
270 kstrdup(buf, GFP_KERNEL);
271 sin = xs_addr_in(xprt);
272 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
273 break;
274 case AF_INET6:
275 (void)rpc_ntop(sap, buf, sizeof(buf));
276 xprt->address_strings[RPC_DISPLAY_ADDR] =
277 kstrdup(buf, GFP_KERNEL);
278 sin6 = xs_addr_in6(xprt);
279 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
280 break;
281 default:
282 BUG();
283 }
284
285 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
286}
287
288static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
289{
290 struct sockaddr *sap = xs_addr(xprt);
291 char buf[128];
292
293 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
294 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
295
296 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
297 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
298}
299
300static void xs_format_peer_addresses(struct rpc_xprt *xprt,
301 const char *protocol,
302 const char *netid)
303{
304 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
305 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
306 xs_format_common_peer_addresses(xprt);
307 xs_format_common_peer_ports(xprt);
308}
309
310static void xs_update_peer_port(struct rpc_xprt *xprt)
311{
312 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
313 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
314
315 xs_format_common_peer_ports(xprt);
316}
317
318static void xs_free_peer_addresses(struct rpc_xprt *xprt)
319{
320 unsigned int i;
321
322 for (i = 0; i < RPC_DISPLAY_MAX; i++)
323 switch (i) {
324 case RPC_DISPLAY_PROTO:
325 case RPC_DISPLAY_NETID:
326 continue;
327 default:
328 kfree(xprt->address_strings[i]);
329 }
330}
331
332static size_t
333xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
334{
335 size_t i,n;
336
337 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
338 return want;
339 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
340 for (i = 0; i < n; i++) {
341 if (buf->pages[i])
342 continue;
343 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
344 if (!buf->pages[i]) {
345 i *= PAGE_SIZE;
346 return i > buf->page_base ? i - buf->page_base : 0;
347 }
348 }
349 return want;
350}
351
352static ssize_t
353xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
354{
355 ssize_t ret;
356 if (seek != 0)
357 iov_iter_advance(&msg->msg_iter, seek);
358 ret = sock_recvmsg(sock, msg, flags);
359 return ret > 0 ? ret + seek : ret;
360}
361
362static ssize_t
363xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
364 struct kvec *kvec, size_t count, size_t seek)
365{
366 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
367 return xs_sock_recvmsg(sock, msg, flags, seek);
368}
369
370static ssize_t
371xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
372 struct bio_vec *bvec, unsigned long nr, size_t count,
373 size_t seek)
374{
375 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
376 return xs_sock_recvmsg(sock, msg, flags, seek);
377}
378
379static ssize_t
380xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
381 size_t count)
382{
383 iov_iter_discard(&msg->msg_iter, READ, count);
384 return sock_recvmsg(sock, msg, flags);
385}
386
387#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
388static void
389xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
390{
391 struct bvec_iter bi = {
392 .bi_size = count,
393 };
394 struct bio_vec bv;
395
396 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
397 for_each_bvec(bv, bvec, bi, bi)
398 flush_dcache_page(bv.bv_page);
399}
400#else
401static inline void
402xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
403{
404}
405#endif
406
407static ssize_t
408xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
409 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
410{
411 size_t want, seek_init = seek, offset = 0;
412 ssize_t ret;
413
414 want = min_t(size_t, count, buf->head[0].iov_len);
415 if (seek < want) {
416 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
417 if (ret <= 0)
418 goto sock_err;
419 offset += ret;
420 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
421 goto out;
422 if (ret != want)
423 goto out;
424 seek = 0;
425 } else {
426 seek -= want;
427 offset += want;
428 }
429
430 want = xs_alloc_sparse_pages(buf,
431 min_t(size_t, count - offset, buf->page_len),
432 GFP_KERNEL);
433 if (seek < want) {
434 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
435 xdr_buf_pagecount(buf),
436 want + buf->page_base,
437 seek + buf->page_base);
438 if (ret <= 0)
439 goto sock_err;
440 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
441 ret -= buf->page_base;
442 offset += ret;
443 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
444 goto out;
445 if (ret != want)
446 goto out;
447 seek = 0;
448 } else {
449 seek -= want;
450 offset += want;
451 }
452
453 want = min_t(size_t, count - offset, buf->tail[0].iov_len);
454 if (seek < want) {
455 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
456 if (ret <= 0)
457 goto sock_err;
458 offset += ret;
459 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
460 goto out;
461 if (ret != want)
462 goto out;
463 } else if (offset < seek_init)
464 offset = seek_init;
465 ret = -EMSGSIZE;
466out:
467 *read = offset - seek_init;
468 return ret;
469sock_err:
470 offset += seek;
471 goto out;
472}
473
474static void
475xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
476{
477 if (!transport->recv.copied) {
478 if (buf->head[0].iov_len >= transport->recv.offset)
479 memcpy(buf->head[0].iov_base,
480 &transport->recv.xid,
481 transport->recv.offset);
482 transport->recv.copied = transport->recv.offset;
483 }
484}
485
486static bool
487xs_read_stream_request_done(struct sock_xprt *transport)
488{
489 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
490}
491
492static void
493xs_read_stream_check_eor(struct sock_xprt *transport,
494 struct msghdr *msg)
495{
496 if (xs_read_stream_request_done(transport))
497 msg->msg_flags |= MSG_EOR;
498}
499
500static ssize_t
501xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
502 int flags, struct rpc_rqst *req)
503{
504 struct xdr_buf *buf = &req->rq_private_buf;
505 size_t want, read;
506 ssize_t ret;
507
508 xs_read_header(transport, buf);
509
510 want = transport->recv.len - transport->recv.offset;
511 if (want != 0) {
512 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
513 transport->recv.copied + want,
514 transport->recv.copied,
515 &read);
516 transport->recv.offset += read;
517 transport->recv.copied += read;
518 }
519
520 if (transport->recv.offset == transport->recv.len)
521 xs_read_stream_check_eor(transport, msg);
522
523 if (want == 0)
524 return 0;
525
526 switch (ret) {
527 default:
528 break;
529 case -EFAULT:
530 case -EMSGSIZE:
531 msg->msg_flags |= MSG_TRUNC;
532 return read;
533 case 0:
534 return -ESHUTDOWN;
535 }
536 return ret < 0 ? ret : read;
537}
538
539static size_t
540xs_read_stream_headersize(bool isfrag)
541{
542 if (isfrag)
543 return sizeof(__be32);
544 return 3 * sizeof(__be32);
545}
546
547static ssize_t
548xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
549 int flags, size_t want, size_t seek)
550{
551 struct kvec kvec = {
552 .iov_base = &transport->recv.fraghdr,
553 .iov_len = want,
554 };
555 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
556}
557
558#if defined(CONFIG_SUNRPC_BACKCHANNEL)
559static ssize_t
560xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
561{
562 struct rpc_xprt *xprt = &transport->xprt;
563 struct rpc_rqst *req;
564 ssize_t ret;
565
566 /* Is this transport associated with the backchannel? */
567 if (!xprt->bc_serv)
568 return -ESHUTDOWN;
569
570 /* Look up and lock the request corresponding to the given XID */
571 req = xprt_lookup_bc_request(xprt, transport->recv.xid);
572 if (!req) {
573 printk(KERN_WARNING "Callback slot table overflowed\n");
574 return -ESHUTDOWN;
575 }
576 if (transport->recv.copied && !req->rq_private_buf.len)
577 return -ESHUTDOWN;
578
579 ret = xs_read_stream_request(transport, msg, flags, req);
580 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
581 xprt_complete_bc_request(req, transport->recv.copied);
582 else
583 req->rq_private_buf.len = transport->recv.copied;
584
585 return ret;
586}
587#else /* CONFIG_SUNRPC_BACKCHANNEL */
588static ssize_t
589xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
590{
591 return -ESHUTDOWN;
592}
593#endif /* CONFIG_SUNRPC_BACKCHANNEL */
594
595static ssize_t
596xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
597{
598 struct rpc_xprt *xprt = &transport->xprt;
599 struct rpc_rqst *req;
600 ssize_t ret = 0;
601
602 /* Look up and lock the request corresponding to the given XID */
603 spin_lock(&xprt->queue_lock);
604 req = xprt_lookup_rqst(xprt, transport->recv.xid);
605 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
606 msg->msg_flags |= MSG_TRUNC;
607 goto out;
608 }
609 xprt_pin_rqst(req);
610 spin_unlock(&xprt->queue_lock);
611
612 ret = xs_read_stream_request(transport, msg, flags, req);
613
614 spin_lock(&xprt->queue_lock);
615 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
616 xprt_complete_rqst(req->rq_task, transport->recv.copied);
617 else
618 req->rq_private_buf.len = transport->recv.copied;
619 xprt_unpin_rqst(req);
620out:
621 spin_unlock(&xprt->queue_lock);
622 return ret;
623}
624
625static ssize_t
626xs_read_stream(struct sock_xprt *transport, int flags)
627{
628 struct msghdr msg = { 0 };
629 size_t want, read = 0;
630 ssize_t ret = 0;
631
632 if (transport->recv.len == 0) {
633 want = xs_read_stream_headersize(transport->recv.copied != 0);
634 ret = xs_read_stream_header(transport, &msg, flags, want,
635 transport->recv.offset);
636 if (ret <= 0)
637 goto out_err;
638 transport->recv.offset = ret;
639 if (transport->recv.offset != want)
640 return transport->recv.offset;
641 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
642 RPC_FRAGMENT_SIZE_MASK;
643 transport->recv.offset -= sizeof(transport->recv.fraghdr);
644 read = ret;
645 }
646
647 switch (be32_to_cpu(transport->recv.calldir)) {
648 default:
649 msg.msg_flags |= MSG_TRUNC;
650 break;
651 case RPC_CALL:
652 ret = xs_read_stream_call(transport, &msg, flags);
653 break;
654 case RPC_REPLY:
655 ret = xs_read_stream_reply(transport, &msg, flags);
656 }
657 if (msg.msg_flags & MSG_TRUNC) {
658 transport->recv.calldir = cpu_to_be32(-1);
659 transport->recv.copied = -1;
660 }
661 if (ret < 0)
662 goto out_err;
663 read += ret;
664 if (transport->recv.offset < transport->recv.len) {
665 if (!(msg.msg_flags & MSG_TRUNC))
666 return read;
667 msg.msg_flags = 0;
668 ret = xs_read_discard(transport->sock, &msg, flags,
669 transport->recv.len - transport->recv.offset);
670 if (ret <= 0)
671 goto out_err;
672 transport->recv.offset += ret;
673 read += ret;
674 if (transport->recv.offset != transport->recv.len)
675 return read;
676 }
677 if (xs_read_stream_request_done(transport)) {
678 trace_xs_stream_read_request(transport);
679 transport->recv.copied = 0;
680 }
681 transport->recv.offset = 0;
682 transport->recv.len = 0;
683 return read;
684out_err:
685 return ret != 0 ? ret : -ESHUTDOWN;
686}
687
688static __poll_t xs_poll_socket(struct sock_xprt *transport)
689{
690 return transport->sock->ops->poll(transport->file, transport->sock,
691 NULL);
692}
693
694static bool xs_poll_socket_readable(struct sock_xprt *transport)
695{
696 __poll_t events = xs_poll_socket(transport);
697
698 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
699}
700
701static void xs_poll_check_readable(struct sock_xprt *transport)
702{
703
704 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
705 if (!xs_poll_socket_readable(transport))
706 return;
707 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
708 queue_work(xprtiod_workqueue, &transport->recv_worker);
709}
710
711static void xs_stream_data_receive(struct sock_xprt *transport)
712{
713 size_t read = 0;
714 ssize_t ret = 0;
715
716 mutex_lock(&transport->recv_mutex);
717 if (transport->sock == NULL)
718 goto out;
719 for (;;) {
720 ret = xs_read_stream(transport, MSG_DONTWAIT);
721 if (ret < 0)
722 break;
723 read += ret;
724 cond_resched();
725 }
726 if (ret == -ESHUTDOWN)
727 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
728 else
729 xs_poll_check_readable(transport);
730out:
731 mutex_unlock(&transport->recv_mutex);
732 trace_xs_stream_read_data(&transport->xprt, ret, read);
733}
734
735static void xs_stream_data_receive_workfn(struct work_struct *work)
736{
737 struct sock_xprt *transport =
738 container_of(work, struct sock_xprt, recv_worker);
739 unsigned int pflags = memalloc_nofs_save();
740
741 xs_stream_data_receive(transport);
742 memalloc_nofs_restore(pflags);
743}
744
745static void
746xs_stream_reset_connect(struct sock_xprt *transport)
747{
748 transport->recv.offset = 0;
749 transport->recv.len = 0;
750 transport->recv.copied = 0;
751 transport->xmit.offset = 0;
752}
753
754static void
755xs_stream_start_connect(struct sock_xprt *transport)
756{
757 transport->xprt.stat.connect_count++;
758 transport->xprt.stat.connect_start = jiffies;
759}
760
761#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
762
763/**
764 * xs_nospace - handle transmit was incomplete
765 * @req: pointer to RPC request
766 *
767 */
768static int xs_nospace(struct rpc_rqst *req)
769{
770 struct rpc_xprt *xprt = req->rq_xprt;
771 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
772 struct sock *sk = transport->inet;
773 int ret = -EAGAIN;
774
775 trace_rpc_socket_nospace(req, transport);
776
777 /* Protect against races with write_space */
778 spin_lock(&xprt->transport_lock);
779
780 /* Don't race with disconnect */
781 if (xprt_connected(xprt)) {
782 /* wait for more buffer space */
783 sk->sk_write_pending++;
784 xprt_wait_for_buffer_space(xprt);
785 } else
786 ret = -ENOTCONN;
787
788 spin_unlock(&xprt->transport_lock);
789
790 /* Race breaker in case memory is freed before above code is called */
791 if (ret == -EAGAIN) {
792 struct socket_wq *wq;
793
794 rcu_read_lock();
795 wq = rcu_dereference(sk->sk_wq);
796 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
797 rcu_read_unlock();
798
799 sk->sk_write_space(sk);
800 }
801 return ret;
802}
803
804static void
805xs_stream_prepare_request(struct rpc_rqst *req)
806{
807 xdr_free_bvec(&req->rq_rcv_buf);
808 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
809}
810
811/*
812 * Determine if the previous message in the stream was aborted before it
813 * could complete transmission.
814 */
815static bool
816xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
817{
818 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
819}
820
821/*
822 * Return the stream record marker field for a record of length < 2^31-1
823 */
824static rpc_fraghdr
825xs_stream_record_marker(struct xdr_buf *xdr)
826{
827 if (!xdr->len)
828 return 0;
829 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
830}
831
832/**
833 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
834 * @req: pointer to RPC request
835 *
836 * Return values:
837 * 0: The request has been sent
838 * EAGAIN: The socket was blocked, please call again later to
839 * complete the request
840 * ENOTCONN: Caller needs to invoke connect logic then call again
841 * other: Some other error occurred, the request was not sent
842 */
843static int xs_local_send_request(struct rpc_rqst *req)
844{
845 struct rpc_xprt *xprt = req->rq_xprt;
846 struct sock_xprt *transport =
847 container_of(xprt, struct sock_xprt, xprt);
848 struct xdr_buf *xdr = &req->rq_snd_buf;
849 rpc_fraghdr rm = xs_stream_record_marker(xdr);
850 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
851 struct msghdr msg = {
852 .msg_flags = XS_SENDMSG_FLAGS,
853 };
854 unsigned int sent;
855 int status;
856
857 /* Close the stream if the previous transmission was incomplete */
858 if (xs_send_request_was_aborted(transport, req)) {
859 xs_close(xprt);
860 return -ENOTCONN;
861 }
862
863 xs_pktdump("packet data:",
864 req->rq_svec->iov_base, req->rq_svec->iov_len);
865
866 req->rq_xtime = ktime_get();
867 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
868 transport->xmit.offset, rm, &sent);
869 dprintk("RPC: %s(%u) = %d\n",
870 __func__, xdr->len - transport->xmit.offset, status);
871
872 if (status == -EAGAIN && sock_writeable(transport->inet))
873 status = -ENOBUFS;
874
875 if (likely(sent > 0) || status == 0) {
876 transport->xmit.offset += sent;
877 req->rq_bytes_sent = transport->xmit.offset;
878 if (likely(req->rq_bytes_sent >= msglen)) {
879 req->rq_xmit_bytes_sent += transport->xmit.offset;
880 transport->xmit.offset = 0;
881 return 0;
882 }
883 status = -EAGAIN;
884 }
885
886 switch (status) {
887 case -ENOBUFS:
888 break;
889 case -EAGAIN:
890 status = xs_nospace(req);
891 break;
892 default:
893 dprintk("RPC: sendmsg returned unrecognized error %d\n",
894 -status);
895 fallthrough;
896 case -EPIPE:
897 xs_close(xprt);
898 status = -ENOTCONN;
899 }
900
901 return status;
902}
903
904/**
905 * xs_udp_send_request - write an RPC request to a UDP socket
906 * @req: pointer to RPC request
907 *
908 * Return values:
909 * 0: The request has been sent
910 * EAGAIN: The socket was blocked, please call again later to
911 * complete the request
912 * ENOTCONN: Caller needs to invoke connect logic then call again
913 * other: Some other error occurred, the request was not sent
914 */
915static int xs_udp_send_request(struct rpc_rqst *req)
916{
917 struct rpc_xprt *xprt = req->rq_xprt;
918 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
919 struct xdr_buf *xdr = &req->rq_snd_buf;
920 struct msghdr msg = {
921 .msg_name = xs_addr(xprt),
922 .msg_namelen = xprt->addrlen,
923 .msg_flags = XS_SENDMSG_FLAGS,
924 };
925 unsigned int sent;
926 int status;
927
928 xs_pktdump("packet data:",
929 req->rq_svec->iov_base,
930 req->rq_svec->iov_len);
931
932 if (!xprt_bound(xprt))
933 return -ENOTCONN;
934
935 if (!xprt_request_get_cong(xprt, req))
936 return -EBADSLT;
937
938 req->rq_xtime = ktime_get();
939 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
940
941 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
942 xdr->len, status);
943
944 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
945 if (status == -EPERM)
946 goto process_status;
947
948 if (status == -EAGAIN && sock_writeable(transport->inet))
949 status = -ENOBUFS;
950
951 if (sent > 0 || status == 0) {
952 req->rq_xmit_bytes_sent += sent;
953 if (sent >= req->rq_slen)
954 return 0;
955 /* Still some bytes left; set up for a retry later. */
956 status = -EAGAIN;
957 }
958
959process_status:
960 switch (status) {
961 case -ENOTSOCK:
962 status = -ENOTCONN;
963 /* Should we call xs_close() here? */
964 break;
965 case -EAGAIN:
966 status = xs_nospace(req);
967 break;
968 case -ENETUNREACH:
969 case -ENOBUFS:
970 case -EPIPE:
971 case -ECONNREFUSED:
972 case -EPERM:
973 /* When the server has died, an ICMP port unreachable message
974 * prompts ECONNREFUSED. */
975 break;
976 default:
977 dprintk("RPC: sendmsg returned unrecognized error %d\n",
978 -status);
979 }
980
981 return status;
982}
983
984/**
985 * xs_tcp_send_request - write an RPC request to a TCP socket
986 * @req: pointer to RPC request
987 *
988 * Return values:
989 * 0: The request has been sent
990 * EAGAIN: The socket was blocked, please call again later to
991 * complete the request
992 * ENOTCONN: Caller needs to invoke connect logic then call again
993 * other: Some other error occurred, the request was not sent
994 *
995 * XXX: In the case of soft timeouts, should we eventually give up
996 * if sendmsg is not able to make progress?
997 */
998static int xs_tcp_send_request(struct rpc_rqst *req)
999{
1000 struct rpc_xprt *xprt = req->rq_xprt;
1001 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1002 struct xdr_buf *xdr = &req->rq_snd_buf;
1003 rpc_fraghdr rm = xs_stream_record_marker(xdr);
1004 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1005 struct msghdr msg = {
1006 .msg_flags = XS_SENDMSG_FLAGS,
1007 };
1008 bool vm_wait = false;
1009 unsigned int sent;
1010 int status;
1011
1012 /* Close the stream if the previous transmission was incomplete */
1013 if (xs_send_request_was_aborted(transport, req)) {
1014 if (transport->sock != NULL)
1015 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1016 return -ENOTCONN;
1017 }
1018 if (!transport->inet)
1019 return -ENOTCONN;
1020
1021 xs_pktdump("packet data:",
1022 req->rq_svec->iov_base,
1023 req->rq_svec->iov_len);
1024
1025 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1026 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1027
1028 /* Continue transmitting the packet/record. We must be careful
1029 * to cope with writespace callbacks arriving _after_ we have
1030 * called sendmsg(). */
1031 req->rq_xtime = ktime_get();
1032 tcp_sock_set_cork(transport->inet, true);
1033 while (1) {
1034 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1035 transport->xmit.offset, rm, &sent);
1036
1037 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
1038 xdr->len - transport->xmit.offset, status);
1039
1040 /* If we've sent the entire packet, immediately
1041 * reset the count of bytes sent. */
1042 transport->xmit.offset += sent;
1043 req->rq_bytes_sent = transport->xmit.offset;
1044 if (likely(req->rq_bytes_sent >= msglen)) {
1045 req->rq_xmit_bytes_sent += transport->xmit.offset;
1046 transport->xmit.offset = 0;
1047 if (atomic_long_read(&xprt->xmit_queuelen) == 1)
1048 tcp_sock_set_cork(transport->inet, false);
1049 return 0;
1050 }
1051
1052 WARN_ON_ONCE(sent == 0 && status == 0);
1053
1054 if (status == -EAGAIN ) {
1055 /*
1056 * Return EAGAIN if we're sure we're hitting the
1057 * socket send buffer limits.
1058 */
1059 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1060 break;
1061 /*
1062 * Did we hit a memory allocation failure?
1063 */
1064 if (sent == 0) {
1065 status = -ENOBUFS;
1066 if (vm_wait)
1067 break;
1068 /* Retry, knowing now that we're below the
1069 * socket send buffer limit
1070 */
1071 vm_wait = true;
1072 }
1073 continue;
1074 }
1075 if (status < 0)
1076 break;
1077 vm_wait = false;
1078 }
1079
1080 switch (status) {
1081 case -ENOTSOCK:
1082 status = -ENOTCONN;
1083 /* Should we call xs_close() here? */
1084 break;
1085 case -EAGAIN:
1086 status = xs_nospace(req);
1087 break;
1088 case -ECONNRESET:
1089 case -ECONNREFUSED:
1090 case -ENOTCONN:
1091 case -EADDRINUSE:
1092 case -ENOBUFS:
1093 case -EPIPE:
1094 break;
1095 default:
1096 dprintk("RPC: sendmsg returned unrecognized error %d\n",
1097 -status);
1098 }
1099
1100 return status;
1101}
1102
1103static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1104{
1105 transport->old_data_ready = sk->sk_data_ready;
1106 transport->old_state_change = sk->sk_state_change;
1107 transport->old_write_space = sk->sk_write_space;
1108 transport->old_error_report = sk->sk_error_report;
1109}
1110
1111static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1112{
1113 sk->sk_data_ready = transport->old_data_ready;
1114 sk->sk_state_change = transport->old_state_change;
1115 sk->sk_write_space = transport->old_write_space;
1116 sk->sk_error_report = transport->old_error_report;
1117}
1118
1119static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1120{
1121 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1122
1123 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1124 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1125 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1126 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1127}
1128
1129static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1130{
1131 set_bit(nr, &transport->sock_state);
1132 queue_work(xprtiod_workqueue, &transport->error_worker);
1133}
1134
1135static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1136{
1137 smp_mb__before_atomic();
1138 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1139 clear_bit(XPRT_CLOSING, &xprt->state);
1140 xs_sock_reset_state_flags(xprt);
1141 smp_mb__after_atomic();
1142}
1143
1144/**
1145 * xs_error_report - callback to handle TCP socket state errors
1146 * @sk: socket
1147 *
1148 * Note: we don't call sock_error() since there may be a rpc_task
1149 * using the socket, and so we don't want to clear sk->sk_err.
1150 */
1151static void xs_error_report(struct sock *sk)
1152{
1153 struct sock_xprt *transport;
1154 struct rpc_xprt *xprt;
1155
1156 read_lock_bh(&sk->sk_callback_lock);
1157 if (!(xprt = xprt_from_sock(sk)))
1158 goto out;
1159
1160 transport = container_of(xprt, struct sock_xprt, xprt);
1161 transport->xprt_err = -sk->sk_err;
1162 if (transport->xprt_err == 0)
1163 goto out;
1164 dprintk("RPC: xs_error_report client %p, error=%d...\n",
1165 xprt, -transport->xprt_err);
1166 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1167
1168 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1169 smp_mb__before_atomic();
1170 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1171 out:
1172 read_unlock_bh(&sk->sk_callback_lock);
1173}
1174
1175static void xs_reset_transport(struct sock_xprt *transport)
1176{
1177 struct socket *sock = transport->sock;
1178 struct sock *sk = transport->inet;
1179 struct rpc_xprt *xprt = &transport->xprt;
1180 struct file *filp = transport->file;
1181
1182 if (sk == NULL)
1183 return;
1184
1185 if (atomic_read(&transport->xprt.swapper))
1186 sk_clear_memalloc(sk);
1187
1188 kernel_sock_shutdown(sock, SHUT_RDWR);
1189
1190 mutex_lock(&transport->recv_mutex);
1191 write_lock_bh(&sk->sk_callback_lock);
1192 transport->inet = NULL;
1193 transport->sock = NULL;
1194 transport->file = NULL;
1195
1196 sk->sk_user_data = NULL;
1197
1198 xs_restore_old_callbacks(transport, sk);
1199 xprt_clear_connected(xprt);
1200 write_unlock_bh(&sk->sk_callback_lock);
1201 xs_sock_reset_connection_flags(xprt);
1202 /* Reset stream record info */
1203 xs_stream_reset_connect(transport);
1204 mutex_unlock(&transport->recv_mutex);
1205
1206 trace_rpc_socket_close(xprt, sock);
1207 fput(filp);
1208
1209 xprt_disconnect_done(xprt);
1210}
1211
1212/**
1213 * xs_close - close a socket
1214 * @xprt: transport
1215 *
1216 * This is used when all requests are complete; ie, no DRC state remains
1217 * on the server we want to save.
1218 *
1219 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1220 * xs_reset_transport() zeroing the socket from underneath a writer.
1221 */
1222static void xs_close(struct rpc_xprt *xprt)
1223{
1224 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1225
1226 dprintk("RPC: xs_close xprt %p\n", xprt);
1227
1228 xs_reset_transport(transport);
1229 xprt->reestablish_timeout = 0;
1230}
1231
1232static void xs_inject_disconnect(struct rpc_xprt *xprt)
1233{
1234 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
1235 xprt);
1236 xprt_disconnect_done(xprt);
1237}
1238
1239static void xs_xprt_free(struct rpc_xprt *xprt)
1240{
1241 xs_free_peer_addresses(xprt);
1242 xprt_free(xprt);
1243}
1244
1245/**
1246 * xs_destroy - prepare to shutdown a transport
1247 * @xprt: doomed transport
1248 *
1249 */
1250static void xs_destroy(struct rpc_xprt *xprt)
1251{
1252 struct sock_xprt *transport = container_of(xprt,
1253 struct sock_xprt, xprt);
1254 dprintk("RPC: xs_destroy xprt %p\n", xprt);
1255
1256 cancel_delayed_work_sync(&transport->connect_worker);
1257 xs_close(xprt);
1258 cancel_work_sync(&transport->recv_worker);
1259 cancel_work_sync(&transport->error_worker);
1260 xs_xprt_free(xprt);
1261 module_put(THIS_MODULE);
1262}
1263
1264/**
1265 * xs_udp_data_read_skb - receive callback for UDP sockets
1266 * @xprt: transport
1267 * @sk: socket
1268 * @skb: skbuff
1269 *
1270 */
1271static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1272 struct sock *sk,
1273 struct sk_buff *skb)
1274{
1275 struct rpc_task *task;
1276 struct rpc_rqst *rovr;
1277 int repsize, copied;
1278 u32 _xid;
1279 __be32 *xp;
1280
1281 repsize = skb->len;
1282 if (repsize < 4) {
1283 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1284 return;
1285 }
1286
1287 /* Copy the XID from the skb... */
1288 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1289 if (xp == NULL)
1290 return;
1291
1292 /* Look up and lock the request corresponding to the given XID */
1293 spin_lock(&xprt->queue_lock);
1294 rovr = xprt_lookup_rqst(xprt, *xp);
1295 if (!rovr)
1296 goto out_unlock;
1297 xprt_pin_rqst(rovr);
1298 xprt_update_rtt(rovr->rq_task);
1299 spin_unlock(&xprt->queue_lock);
1300 task = rovr->rq_task;
1301
1302 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1303 copied = repsize;
1304
1305 /* Suck it into the iovec, verify checksum if not done by hw. */
1306 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1307 spin_lock(&xprt->queue_lock);
1308 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1309 goto out_unpin;
1310 }
1311
1312
1313 spin_lock(&xprt->transport_lock);
1314 xprt_adjust_cwnd(xprt, task, copied);
1315 spin_unlock(&xprt->transport_lock);
1316 spin_lock(&xprt->queue_lock);
1317 xprt_complete_rqst(task, copied);
1318 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1319out_unpin:
1320 xprt_unpin_rqst(rovr);
1321 out_unlock:
1322 spin_unlock(&xprt->queue_lock);
1323}
1324
1325static void xs_udp_data_receive(struct sock_xprt *transport)
1326{
1327 struct sk_buff *skb;
1328 struct sock *sk;
1329 int err;
1330
1331 mutex_lock(&transport->recv_mutex);
1332 sk = transport->inet;
1333 if (sk == NULL)
1334 goto out;
1335 for (;;) {
1336 skb = skb_recv_udp(sk, 0, 1, &err);
1337 if (skb == NULL)
1338 break;
1339 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1340 consume_skb(skb);
1341 cond_resched();
1342 }
1343 xs_poll_check_readable(transport);
1344out:
1345 mutex_unlock(&transport->recv_mutex);
1346}
1347
1348static void xs_udp_data_receive_workfn(struct work_struct *work)
1349{
1350 struct sock_xprt *transport =
1351 container_of(work, struct sock_xprt, recv_worker);
1352 unsigned int pflags = memalloc_nofs_save();
1353
1354 xs_udp_data_receive(transport);
1355 memalloc_nofs_restore(pflags);
1356}
1357
1358/**
1359 * xs_data_ready - "data ready" callback for UDP sockets
1360 * @sk: socket with data to read
1361 *
1362 */
1363static void xs_data_ready(struct sock *sk)
1364{
1365 struct rpc_xprt *xprt;
1366
1367 read_lock_bh(&sk->sk_callback_lock);
1368 dprintk("RPC: xs_data_ready...\n");
1369 xprt = xprt_from_sock(sk);
1370 if (xprt != NULL) {
1371 struct sock_xprt *transport = container_of(xprt,
1372 struct sock_xprt, xprt);
1373 transport->old_data_ready(sk);
1374 /* Any data means we had a useful conversation, so
1375 * then we don't need to delay the next reconnect
1376 */
1377 if (xprt->reestablish_timeout)
1378 xprt->reestablish_timeout = 0;
1379 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1380 queue_work(xprtiod_workqueue, &transport->recv_worker);
1381 }
1382 read_unlock_bh(&sk->sk_callback_lock);
1383}
1384
1385/*
1386 * Helper function to force a TCP close if the server is sending
1387 * junk and/or it has put us in CLOSE_WAIT
1388 */
1389static void xs_tcp_force_close(struct rpc_xprt *xprt)
1390{
1391 xprt_force_disconnect(xprt);
1392}
1393
1394#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1395static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1396{
1397 return PAGE_SIZE;
1398}
1399#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1400
1401/**
1402 * xs_tcp_state_change - callback to handle TCP socket state changes
1403 * @sk: socket whose state has changed
1404 *
1405 */
1406static void xs_tcp_state_change(struct sock *sk)
1407{
1408 struct rpc_xprt *xprt;
1409 struct sock_xprt *transport;
1410
1411 read_lock_bh(&sk->sk_callback_lock);
1412 if (!(xprt = xprt_from_sock(sk)))
1413 goto out;
1414 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1415 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1416 sk->sk_state, xprt_connected(xprt),
1417 sock_flag(sk, SOCK_DEAD),
1418 sock_flag(sk, SOCK_ZAPPED),
1419 sk->sk_shutdown);
1420
1421 transport = container_of(xprt, struct sock_xprt, xprt);
1422 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1423 switch (sk->sk_state) {
1424 case TCP_ESTABLISHED:
1425 if (!xprt_test_and_set_connected(xprt)) {
1426 xprt->connect_cookie++;
1427 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1428 xprt_clear_connecting(xprt);
1429
1430 xprt->stat.connect_count++;
1431 xprt->stat.connect_time += (long)jiffies -
1432 xprt->stat.connect_start;
1433 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1434 }
1435 break;
1436 case TCP_FIN_WAIT1:
1437 /* The client initiated a shutdown of the socket */
1438 xprt->connect_cookie++;
1439 xprt->reestablish_timeout = 0;
1440 set_bit(XPRT_CLOSING, &xprt->state);
1441 smp_mb__before_atomic();
1442 clear_bit(XPRT_CONNECTED, &xprt->state);
1443 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1444 smp_mb__after_atomic();
1445 break;
1446 case TCP_CLOSE_WAIT:
1447 /* The server initiated a shutdown of the socket */
1448 xprt->connect_cookie++;
1449 clear_bit(XPRT_CONNECTED, &xprt->state);
1450 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1451 fallthrough;
1452 case TCP_CLOSING:
1453 /*
1454 * If the server closed down the connection, make sure that
1455 * we back off before reconnecting
1456 */
1457 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1458 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1459 break;
1460 case TCP_LAST_ACK:
1461 set_bit(XPRT_CLOSING, &xprt->state);
1462 smp_mb__before_atomic();
1463 clear_bit(XPRT_CONNECTED, &xprt->state);
1464 smp_mb__after_atomic();
1465 break;
1466 case TCP_CLOSE:
1467 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1468 &transport->sock_state))
1469 xprt_clear_connecting(xprt);
1470 clear_bit(XPRT_CLOSING, &xprt->state);
1471 /* Trigger the socket release */
1472 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1473 }
1474 out:
1475 read_unlock_bh(&sk->sk_callback_lock);
1476}
1477
1478static void xs_write_space(struct sock *sk)
1479{
1480 struct socket_wq *wq;
1481 struct sock_xprt *transport;
1482 struct rpc_xprt *xprt;
1483
1484 if (!sk->sk_socket)
1485 return;
1486 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1487
1488 if (unlikely(!(xprt = xprt_from_sock(sk))))
1489 return;
1490 transport = container_of(xprt, struct sock_xprt, xprt);
1491 rcu_read_lock();
1492 wq = rcu_dereference(sk->sk_wq);
1493 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1494 goto out;
1495
1496 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1497 sk->sk_write_pending--;
1498out:
1499 rcu_read_unlock();
1500}
1501
1502/**
1503 * xs_udp_write_space - callback invoked when socket buffer space
1504 * becomes available
1505 * @sk: socket whose state has changed
1506 *
1507 * Called when more output buffer space is available for this socket.
1508 * We try not to wake our writers until they can make "significant"
1509 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1510 * with a bunch of small requests.
1511 */
1512static void xs_udp_write_space(struct sock *sk)
1513{
1514 read_lock_bh(&sk->sk_callback_lock);
1515
1516 /* from net/core/sock.c:sock_def_write_space */
1517 if (sock_writeable(sk))
1518 xs_write_space(sk);
1519
1520 read_unlock_bh(&sk->sk_callback_lock);
1521}
1522
1523/**
1524 * xs_tcp_write_space - callback invoked when socket buffer space
1525 * becomes available
1526 * @sk: socket whose state has changed
1527 *
1528 * Called when more output buffer space is available for this socket.
1529 * We try not to wake our writers until they can make "significant"
1530 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1531 * with a bunch of small requests.
1532 */
1533static void xs_tcp_write_space(struct sock *sk)
1534{
1535 read_lock_bh(&sk->sk_callback_lock);
1536
1537 /* from net/core/stream.c:sk_stream_write_space */
1538 if (sk_stream_is_writeable(sk))
1539 xs_write_space(sk);
1540
1541 read_unlock_bh(&sk->sk_callback_lock);
1542}
1543
1544static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1545{
1546 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1547 struct sock *sk = transport->inet;
1548
1549 if (transport->rcvsize) {
1550 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1551 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1552 }
1553 if (transport->sndsize) {
1554 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1555 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1556 sk->sk_write_space(sk);
1557 }
1558}
1559
1560/**
1561 * xs_udp_set_buffer_size - set send and receive limits
1562 * @xprt: generic transport
1563 * @sndsize: requested size of send buffer, in bytes
1564 * @rcvsize: requested size of receive buffer, in bytes
1565 *
1566 * Set socket send and receive buffer size limits.
1567 */
1568static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1569{
1570 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1571
1572 transport->sndsize = 0;
1573 if (sndsize)
1574 transport->sndsize = sndsize + 1024;
1575 transport->rcvsize = 0;
1576 if (rcvsize)
1577 transport->rcvsize = rcvsize + 1024;
1578
1579 xs_udp_do_set_buffer_size(xprt);
1580}
1581
1582/**
1583 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1584 * @xprt: controlling transport
1585 * @task: task that timed out
1586 *
1587 * Adjust the congestion window after a retransmit timeout has occurred.
1588 */
1589static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1590{
1591 spin_lock(&xprt->transport_lock);
1592 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1593 spin_unlock(&xprt->transport_lock);
1594}
1595
1596static int xs_get_random_port(void)
1597{
1598 unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1599 unsigned short range;
1600 unsigned short rand;
1601
1602 if (max < min)
1603 return -EADDRINUSE;
1604 range = max - min + 1;
1605 rand = (unsigned short) prandom_u32() % range;
1606 return rand + min;
1607}
1608
1609static unsigned short xs_sock_getport(struct socket *sock)
1610{
1611 struct sockaddr_storage buf;
1612 unsigned short port = 0;
1613
1614 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1615 goto out;
1616 switch (buf.ss_family) {
1617 case AF_INET6:
1618 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1619 break;
1620 case AF_INET:
1621 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1622 }
1623out:
1624 return port;
1625}
1626
1627/**
1628 * xs_set_port - reset the port number in the remote endpoint address
1629 * @xprt: generic transport
1630 * @port: new port number
1631 *
1632 */
1633static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1634{
1635 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1636
1637 rpc_set_port(xs_addr(xprt), port);
1638 xs_update_peer_port(xprt);
1639}
1640
1641static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1642{
1643 if (transport->srcport == 0 && transport->xprt.reuseport)
1644 transport->srcport = xs_sock_getport(sock);
1645}
1646
1647static int xs_get_srcport(struct sock_xprt *transport)
1648{
1649 int port = transport->srcport;
1650
1651 if (port == 0 && transport->xprt.resvport)
1652 port = xs_get_random_port();
1653 return port;
1654}
1655
1656unsigned short get_srcport(struct rpc_xprt *xprt)
1657{
1658 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1659 return xs_sock_getport(sock->sock);
1660}
1661EXPORT_SYMBOL(get_srcport);
1662
1663static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1664{
1665 if (transport->srcport != 0)
1666 transport->srcport = 0;
1667 if (!transport->xprt.resvport)
1668 return 0;
1669 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1670 return xprt_max_resvport;
1671 return --port;
1672}
1673static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1674{
1675 struct sockaddr_storage myaddr;
1676 int err, nloop = 0;
1677 int port = xs_get_srcport(transport);
1678 unsigned short last;
1679
1680 /*
1681 * If we are asking for any ephemeral port (i.e. port == 0 &&
1682 * transport->xprt.resvport == 0), don't bind. Let the local
1683 * port selection happen implicitly when the socket is used
1684 * (for example at connect time).
1685 *
1686 * This ensures that we can continue to establish TCP
1687 * connections even when all local ephemeral ports are already
1688 * a part of some TCP connection. This makes no difference
1689 * for UDP sockets, but also doesn't harm them.
1690 *
1691 * If we're asking for any reserved port (i.e. port == 0 &&
1692 * transport->xprt.resvport == 1) xs_get_srcport above will
1693 * ensure that port is non-zero and we will bind as needed.
1694 */
1695 if (port <= 0)
1696 return port;
1697
1698 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1699 do {
1700 rpc_set_port((struct sockaddr *)&myaddr, port);
1701 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1702 transport->xprt.addrlen);
1703 if (err == 0) {
1704 if (transport->xprt.reuseport)
1705 transport->srcport = port;
1706 break;
1707 }
1708 last = port;
1709 port = xs_next_srcport(transport, port);
1710 if (port > last)
1711 nloop++;
1712 } while (err == -EADDRINUSE && nloop != 2);
1713
1714 if (myaddr.ss_family == AF_INET)
1715 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1716 &((struct sockaddr_in *)&myaddr)->sin_addr,
1717 port, err ? "failed" : "ok", err);
1718 else
1719 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1720 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1721 port, err ? "failed" : "ok", err);
1722 return err;
1723}
1724
1725/*
1726 * We don't support autobind on AF_LOCAL sockets
1727 */
1728static void xs_local_rpcbind(struct rpc_task *task)
1729{
1730 xprt_set_bound(task->tk_xprt);
1731}
1732
1733static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1734{
1735}
1736
1737#ifdef CONFIG_DEBUG_LOCK_ALLOC
1738static struct lock_class_key xs_key[2];
1739static struct lock_class_key xs_slock_key[2];
1740
1741static inline void xs_reclassify_socketu(struct socket *sock)
1742{
1743 struct sock *sk = sock->sk;
1744
1745 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1746 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1747}
1748
1749static inline void xs_reclassify_socket4(struct socket *sock)
1750{
1751 struct sock *sk = sock->sk;
1752
1753 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1754 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1755}
1756
1757static inline void xs_reclassify_socket6(struct socket *sock)
1758{
1759 struct sock *sk = sock->sk;
1760
1761 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1762 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1763}
1764
1765static inline void xs_reclassify_socket(int family, struct socket *sock)
1766{
1767 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1768 return;
1769
1770 switch (family) {
1771 case AF_LOCAL:
1772 xs_reclassify_socketu(sock);
1773 break;
1774 case AF_INET:
1775 xs_reclassify_socket4(sock);
1776 break;
1777 case AF_INET6:
1778 xs_reclassify_socket6(sock);
1779 break;
1780 }
1781}
1782#else
1783static inline void xs_reclassify_socket(int family, struct socket *sock)
1784{
1785}
1786#endif
1787
1788static void xs_dummy_setup_socket(struct work_struct *work)
1789{
1790}
1791
1792static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1793 struct sock_xprt *transport, int family, int type,
1794 int protocol, bool reuseport)
1795{
1796 struct file *filp;
1797 struct socket *sock;
1798 int err;
1799
1800 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1801 if (err < 0) {
1802 dprintk("RPC: can't create %d transport socket (%d).\n",
1803 protocol, -err);
1804 goto out;
1805 }
1806 xs_reclassify_socket(family, sock);
1807
1808 if (reuseport)
1809 sock_set_reuseport(sock->sk);
1810
1811 err = xs_bind(transport, sock);
1812 if (err) {
1813 sock_release(sock);
1814 goto out;
1815 }
1816
1817 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1818 if (IS_ERR(filp))
1819 return ERR_CAST(filp);
1820 transport->file = filp;
1821
1822 return sock;
1823out:
1824 return ERR_PTR(err);
1825}
1826
1827static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1828 struct socket *sock)
1829{
1830 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1831 xprt);
1832
1833 if (!transport->inet) {
1834 struct sock *sk = sock->sk;
1835
1836 write_lock_bh(&sk->sk_callback_lock);
1837
1838 xs_save_old_callbacks(transport, sk);
1839
1840 sk->sk_user_data = xprt;
1841 sk->sk_data_ready = xs_data_ready;
1842 sk->sk_write_space = xs_udp_write_space;
1843 sock_set_flag(sk, SOCK_FASYNC);
1844 sk->sk_error_report = xs_error_report;
1845
1846 xprt_clear_connected(xprt);
1847
1848 /* Reset to new socket */
1849 transport->sock = sock;
1850 transport->inet = sk;
1851
1852 write_unlock_bh(&sk->sk_callback_lock);
1853 }
1854
1855 xs_stream_start_connect(transport);
1856
1857 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1858}
1859
1860/**
1861 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1862 * @transport: socket transport to connect
1863 */
1864static int xs_local_setup_socket(struct sock_xprt *transport)
1865{
1866 struct rpc_xprt *xprt = &transport->xprt;
1867 struct file *filp;
1868 struct socket *sock;
1869 int status;
1870
1871 status = __sock_create(xprt->xprt_net, AF_LOCAL,
1872 SOCK_STREAM, 0, &sock, 1);
1873 if (status < 0) {
1874 dprintk("RPC: can't create AF_LOCAL "
1875 "transport socket (%d).\n", -status);
1876 goto out;
1877 }
1878 xs_reclassify_socket(AF_LOCAL, sock);
1879
1880 filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1881 if (IS_ERR(filp)) {
1882 status = PTR_ERR(filp);
1883 goto out;
1884 }
1885 transport->file = filp;
1886
1887 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1888 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1889
1890 status = xs_local_finish_connecting(xprt, sock);
1891 trace_rpc_socket_connect(xprt, sock, status);
1892 switch (status) {
1893 case 0:
1894 dprintk("RPC: xprt %p connected to %s\n",
1895 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1896 xprt->stat.connect_count++;
1897 xprt->stat.connect_time += (long)jiffies -
1898 xprt->stat.connect_start;
1899 xprt_set_connected(xprt);
1900 break;
1901 case -ENOBUFS:
1902 break;
1903 case -ENOENT:
1904 dprintk("RPC: xprt %p: socket %s does not exist\n",
1905 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1906 break;
1907 case -ECONNREFUSED:
1908 dprintk("RPC: xprt %p: connection refused for %s\n",
1909 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1910 break;
1911 default:
1912 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1913 __func__, -status,
1914 xprt->address_strings[RPC_DISPLAY_ADDR]);
1915 }
1916
1917out:
1918 xprt_clear_connecting(xprt);
1919 xprt_wake_pending_tasks(xprt, status);
1920 return status;
1921}
1922
1923static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1924{
1925 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1926 int ret;
1927
1928 if (RPC_IS_ASYNC(task)) {
1929 /*
1930 * We want the AF_LOCAL connect to be resolved in the
1931 * filesystem namespace of the process making the rpc
1932 * call. Thus we connect synchronously.
1933 *
1934 * If we want to support asynchronous AF_LOCAL calls,
1935 * we'll need to figure out how to pass a namespace to
1936 * connect.
1937 */
1938 task->tk_rpc_status = -ENOTCONN;
1939 rpc_exit(task, -ENOTCONN);
1940 return;
1941 }
1942 ret = xs_local_setup_socket(transport);
1943 if (ret && !RPC_IS_SOFTCONN(task))
1944 msleep_interruptible(15000);
1945}
1946
1947#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1948/*
1949 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
1950 * know that we have exclusive access to the socket), to guard against
1951 * races with xs_reset_transport.
1952 */
1953static void xs_set_memalloc(struct rpc_xprt *xprt)
1954{
1955 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1956 xprt);
1957
1958 /*
1959 * If there's no sock, then we have nothing to set. The
1960 * reconnecting process will get it for us.
1961 */
1962 if (!transport->inet)
1963 return;
1964 if (atomic_read(&xprt->swapper))
1965 sk_set_memalloc(transport->inet);
1966}
1967
1968/**
1969 * xs_enable_swap - Tag this transport as being used for swap.
1970 * @xprt: transport to tag
1971 *
1972 * Take a reference to this transport on behalf of the rpc_clnt, and
1973 * optionally mark it for swapping if it wasn't already.
1974 */
1975static int
1976xs_enable_swap(struct rpc_xprt *xprt)
1977{
1978 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
1979
1980 if (atomic_inc_return(&xprt->swapper) != 1)
1981 return 0;
1982 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
1983 return -ERESTARTSYS;
1984 if (xs->inet)
1985 sk_set_memalloc(xs->inet);
1986 xprt_release_xprt(xprt, NULL);
1987 return 0;
1988}
1989
1990/**
1991 * xs_disable_swap - Untag this transport as being used for swap.
1992 * @xprt: transport to tag
1993 *
1994 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
1995 * swapper refcount goes to 0, untag the socket as a memalloc socket.
1996 */
1997static void
1998xs_disable_swap(struct rpc_xprt *xprt)
1999{
2000 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2001
2002 if (!atomic_dec_and_test(&xprt->swapper))
2003 return;
2004 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2005 return;
2006 if (xs->inet)
2007 sk_clear_memalloc(xs->inet);
2008 xprt_release_xprt(xprt, NULL);
2009}
2010#else
2011static void xs_set_memalloc(struct rpc_xprt *xprt)
2012{
2013}
2014
2015static int
2016xs_enable_swap(struct rpc_xprt *xprt)
2017{
2018 return -EINVAL;
2019}
2020
2021static void
2022xs_disable_swap(struct rpc_xprt *xprt)
2023{
2024}
2025#endif
2026
2027static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2028{
2029 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2030
2031 if (!transport->inet) {
2032 struct sock *sk = sock->sk;
2033
2034 write_lock_bh(&sk->sk_callback_lock);
2035
2036 xs_save_old_callbacks(transport, sk);
2037
2038 sk->sk_user_data = xprt;
2039 sk->sk_data_ready = xs_data_ready;
2040 sk->sk_write_space = xs_udp_write_space;
2041 sock_set_flag(sk, SOCK_FASYNC);
2042
2043 xprt_set_connected(xprt);
2044
2045 /* Reset to new socket */
2046 transport->sock = sock;
2047 transport->inet = sk;
2048
2049 xs_set_memalloc(xprt);
2050
2051 write_unlock_bh(&sk->sk_callback_lock);
2052 }
2053 xs_udp_do_set_buffer_size(xprt);
2054
2055 xprt->stat.connect_start = jiffies;
2056}
2057
2058static void xs_udp_setup_socket(struct work_struct *work)
2059{
2060 struct sock_xprt *transport =
2061 container_of(work, struct sock_xprt, connect_worker.work);
2062 struct rpc_xprt *xprt = &transport->xprt;
2063 struct socket *sock;
2064 int status = -EIO;
2065
2066 sock = xs_create_sock(xprt, transport,
2067 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2068 IPPROTO_UDP, false);
2069 if (IS_ERR(sock))
2070 goto out;
2071
2072 dprintk("RPC: worker connecting xprt %p via %s to "
2073 "%s (port %s)\n", xprt,
2074 xprt->address_strings[RPC_DISPLAY_PROTO],
2075 xprt->address_strings[RPC_DISPLAY_ADDR],
2076 xprt->address_strings[RPC_DISPLAY_PORT]);
2077
2078 xs_udp_finish_connecting(xprt, sock);
2079 trace_rpc_socket_connect(xprt, sock, 0);
2080 status = 0;
2081out:
2082 xprt_clear_connecting(xprt);
2083 xprt_unlock_connect(xprt, transport);
2084 xprt_wake_pending_tasks(xprt, status);
2085}
2086
2087/**
2088 * xs_tcp_shutdown - gracefully shut down a TCP socket
2089 * @xprt: transport
2090 *
2091 * Initiates a graceful shutdown of the TCP socket by calling the
2092 * equivalent of shutdown(SHUT_RDWR);
2093 */
2094static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2095{
2096 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2097 struct socket *sock = transport->sock;
2098 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2099
2100 if (sock == NULL)
2101 return;
2102 switch (skst) {
2103 default:
2104 kernel_sock_shutdown(sock, SHUT_RDWR);
2105 trace_rpc_socket_shutdown(xprt, sock);
2106 break;
2107 case TCP_CLOSE:
2108 case TCP_TIME_WAIT:
2109 xs_reset_transport(transport);
2110 }
2111}
2112
2113static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2114 struct socket *sock)
2115{
2116 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2117 unsigned int keepidle;
2118 unsigned int keepcnt;
2119 unsigned int timeo;
2120
2121 spin_lock(&xprt->transport_lock);
2122 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2123 keepcnt = xprt->timeout->to_retries + 1;
2124 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2125 (xprt->timeout->to_retries + 1);
2126 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2127 spin_unlock(&xprt->transport_lock);
2128
2129 /* TCP Keepalive options */
2130 sock_set_keepalive(sock->sk);
2131 tcp_sock_set_keepidle(sock->sk, keepidle);
2132 tcp_sock_set_keepintvl(sock->sk, keepidle);
2133 tcp_sock_set_keepcnt(sock->sk, keepcnt);
2134
2135 /* TCP user timeout (see RFC5482) */
2136 tcp_sock_set_user_timeout(sock->sk, timeo);
2137}
2138
2139static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2140 unsigned long connect_timeout,
2141 unsigned long reconnect_timeout)
2142{
2143 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2144 struct rpc_timeout to;
2145 unsigned long initval;
2146
2147 spin_lock(&xprt->transport_lock);
2148 if (reconnect_timeout < xprt->max_reconnect_timeout)
2149 xprt->max_reconnect_timeout = reconnect_timeout;
2150 if (connect_timeout < xprt->connect_timeout) {
2151 memcpy(&to, xprt->timeout, sizeof(to));
2152 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2153 /* Arbitrary lower limit */
2154 if (initval < XS_TCP_INIT_REEST_TO << 1)
2155 initval = XS_TCP_INIT_REEST_TO << 1;
2156 to.to_initval = initval;
2157 to.to_maxval = initval;
2158 memcpy(&transport->tcp_timeout, &to,
2159 sizeof(transport->tcp_timeout));
2160 xprt->timeout = &transport->tcp_timeout;
2161 xprt->connect_timeout = connect_timeout;
2162 }
2163 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2164 spin_unlock(&xprt->transport_lock);
2165}
2166
2167static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2168{
2169 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2170 int ret = -ENOTCONN;
2171
2172 if (!transport->inet) {
2173 struct sock *sk = sock->sk;
2174
2175 /* Avoid temporary address, they are bad for long-lived
2176 * connections such as NFS mounts.
2177 * RFC4941, section 3.6 suggests that:
2178 * Individual applications, which have specific
2179 * knowledge about the normal duration of connections,
2180 * MAY override this as appropriate.
2181 */
2182 if (xs_addr(xprt)->sa_family == PF_INET6) {
2183 ip6_sock_set_addr_preferences(sk,
2184 IPV6_PREFER_SRC_PUBLIC);
2185 }
2186
2187 xs_tcp_set_socket_timeouts(xprt, sock);
2188 tcp_sock_set_nodelay(sk);
2189
2190 write_lock_bh(&sk->sk_callback_lock);
2191
2192 xs_save_old_callbacks(transport, sk);
2193
2194 sk->sk_user_data = xprt;
2195 sk->sk_data_ready = xs_data_ready;
2196 sk->sk_state_change = xs_tcp_state_change;
2197 sk->sk_write_space = xs_tcp_write_space;
2198 sock_set_flag(sk, SOCK_FASYNC);
2199 sk->sk_error_report = xs_error_report;
2200
2201 /* socket options */
2202 sock_reset_flag(sk, SOCK_LINGER);
2203
2204 xprt_clear_connected(xprt);
2205
2206 /* Reset to new socket */
2207 transport->sock = sock;
2208 transport->inet = sk;
2209
2210 write_unlock_bh(&sk->sk_callback_lock);
2211 }
2212
2213 if (!xprt_bound(xprt))
2214 goto out;
2215
2216 xs_set_memalloc(xprt);
2217
2218 xs_stream_start_connect(transport);
2219
2220 /* Tell the socket layer to start connecting... */
2221 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2222 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2223 switch (ret) {
2224 case 0:
2225 xs_set_srcport(transport, sock);
2226 fallthrough;
2227 case -EINPROGRESS:
2228 /* SYN_SENT! */
2229 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2230 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2231 break;
2232 case -EADDRNOTAVAIL:
2233 /* Source port number is unavailable. Try a new one! */
2234 transport->srcport = 0;
2235 }
2236out:
2237 return ret;
2238}
2239
2240/**
2241 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2242 * @work: queued work item
2243 *
2244 * Invoked by a work queue tasklet.
2245 */
2246static void xs_tcp_setup_socket(struct work_struct *work)
2247{
2248 struct sock_xprt *transport =
2249 container_of(work, struct sock_xprt, connect_worker.work);
2250 struct socket *sock = transport->sock;
2251 struct rpc_xprt *xprt = &transport->xprt;
2252 int status = -EIO;
2253
2254 if (!sock) {
2255 sock = xs_create_sock(xprt, transport,
2256 xs_addr(xprt)->sa_family, SOCK_STREAM,
2257 IPPROTO_TCP, true);
2258 if (IS_ERR(sock)) {
2259 status = PTR_ERR(sock);
2260 goto out;
2261 }
2262 }
2263
2264 dprintk("RPC: worker connecting xprt %p via %s to "
2265 "%s (port %s)\n", xprt,
2266 xprt->address_strings[RPC_DISPLAY_PROTO],
2267 xprt->address_strings[RPC_DISPLAY_ADDR],
2268 xprt->address_strings[RPC_DISPLAY_PORT]);
2269
2270 status = xs_tcp_finish_connecting(xprt, sock);
2271 trace_rpc_socket_connect(xprt, sock, status);
2272 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2273 xprt, -status, xprt_connected(xprt),
2274 sock->sk->sk_state);
2275 switch (status) {
2276 default:
2277 printk("%s: connect returned unhandled error %d\n",
2278 __func__, status);
2279 fallthrough;
2280 case -EADDRNOTAVAIL:
2281 /* We're probably in TIME_WAIT. Get rid of existing socket,
2282 * and retry
2283 */
2284 xs_tcp_force_close(xprt);
2285 break;
2286 case 0:
2287 case -EINPROGRESS:
2288 case -EALREADY:
2289 xprt_unlock_connect(xprt, transport);
2290 return;
2291 case -EINVAL:
2292 /* Happens, for instance, if the user specified a link
2293 * local IPv6 address without a scope-id.
2294 */
2295 case -ECONNREFUSED:
2296 case -ECONNRESET:
2297 case -ENETDOWN:
2298 case -ENETUNREACH:
2299 case -EHOSTUNREACH:
2300 case -EADDRINUSE:
2301 case -ENOBUFS:
2302 /* xs_tcp_force_close() wakes tasks with a fixed error code.
2303 * We need to wake them first to ensure the correct error code.
2304 */
2305 xprt_wake_pending_tasks(xprt, status);
2306 xs_tcp_force_close(xprt);
2307 goto out;
2308 }
2309 status = -EAGAIN;
2310out:
2311 xprt_clear_connecting(xprt);
2312 xprt_unlock_connect(xprt, transport);
2313 xprt_wake_pending_tasks(xprt, status);
2314}
2315
2316/**
2317 * xs_connect - connect a socket to a remote endpoint
2318 * @xprt: pointer to transport structure
2319 * @task: address of RPC task that manages state of connect request
2320 *
2321 * TCP: If the remote end dropped the connection, delay reconnecting.
2322 *
2323 * UDP socket connects are synchronous, but we use a work queue anyway
2324 * to guarantee that even unprivileged user processes can set up a
2325 * socket on a privileged port.
2326 *
2327 * If a UDP socket connect fails, the delay behavior here prevents
2328 * retry floods (hard mounts).
2329 */
2330static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2331{
2332 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2333 unsigned long delay = 0;
2334
2335 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2336
2337 if (transport->sock != NULL) {
2338 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2339 "seconds\n",
2340 xprt, xprt->reestablish_timeout / HZ);
2341
2342 /* Start by resetting any existing state */
2343 xs_reset_transport(transport);
2344
2345 delay = xprt_reconnect_delay(xprt);
2346 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2347
2348 } else
2349 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2350
2351 queue_delayed_work(xprtiod_workqueue,
2352 &transport->connect_worker,
2353 delay);
2354}
2355
2356static void xs_wake_disconnect(struct sock_xprt *transport)
2357{
2358 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2359 xs_tcp_force_close(&transport->xprt);
2360}
2361
2362static void xs_wake_write(struct sock_xprt *transport)
2363{
2364 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2365 xprt_write_space(&transport->xprt);
2366}
2367
2368static void xs_wake_error(struct sock_xprt *transport)
2369{
2370 int sockerr;
2371
2372 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2373 return;
2374 mutex_lock(&transport->recv_mutex);
2375 if (transport->sock == NULL)
2376 goto out;
2377 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2378 goto out;
2379 sockerr = xchg(&transport->xprt_err, 0);
2380 if (sockerr < 0)
2381 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2382out:
2383 mutex_unlock(&transport->recv_mutex);
2384}
2385
2386static void xs_wake_pending(struct sock_xprt *transport)
2387{
2388 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2389 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2390}
2391
2392static void xs_error_handle(struct work_struct *work)
2393{
2394 struct sock_xprt *transport = container_of(work,
2395 struct sock_xprt, error_worker);
2396
2397 xs_wake_disconnect(transport);
2398 xs_wake_write(transport);
2399 xs_wake_error(transport);
2400 xs_wake_pending(transport);
2401}
2402
2403/**
2404 * xs_local_print_stats - display AF_LOCAL socket-specific stats
2405 * @xprt: rpc_xprt struct containing statistics
2406 * @seq: output file
2407 *
2408 */
2409static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2410{
2411 long idle_time = 0;
2412
2413 if (xprt_connected(xprt))
2414 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2415
2416 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2417 "%llu %llu %lu %llu %llu\n",
2418 xprt->stat.bind_count,
2419 xprt->stat.connect_count,
2420 xprt->stat.connect_time / HZ,
2421 idle_time,
2422 xprt->stat.sends,
2423 xprt->stat.recvs,
2424 xprt->stat.bad_xids,
2425 xprt->stat.req_u,
2426 xprt->stat.bklog_u,
2427 xprt->stat.max_slots,
2428 xprt->stat.sending_u,
2429 xprt->stat.pending_u);
2430}
2431
2432/**
2433 * xs_udp_print_stats - display UDP socket-specific stats
2434 * @xprt: rpc_xprt struct containing statistics
2435 * @seq: output file
2436 *
2437 */
2438static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2439{
2440 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2441
2442 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2443 "%lu %llu %llu\n",
2444 transport->srcport,
2445 xprt->stat.bind_count,
2446 xprt->stat.sends,
2447 xprt->stat.recvs,
2448 xprt->stat.bad_xids,
2449 xprt->stat.req_u,
2450 xprt->stat.bklog_u,
2451 xprt->stat.max_slots,
2452 xprt->stat.sending_u,
2453 xprt->stat.pending_u);
2454}
2455
2456/**
2457 * xs_tcp_print_stats - display TCP socket-specific stats
2458 * @xprt: rpc_xprt struct containing statistics
2459 * @seq: output file
2460 *
2461 */
2462static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2463{
2464 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2465 long idle_time = 0;
2466
2467 if (xprt_connected(xprt))
2468 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2469
2470 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2471 "%llu %llu %lu %llu %llu\n",
2472 transport->srcport,
2473 xprt->stat.bind_count,
2474 xprt->stat.connect_count,
2475 xprt->stat.connect_time / HZ,
2476 idle_time,
2477 xprt->stat.sends,
2478 xprt->stat.recvs,
2479 xprt->stat.bad_xids,
2480 xprt->stat.req_u,
2481 xprt->stat.bklog_u,
2482 xprt->stat.max_slots,
2483 xprt->stat.sending_u,
2484 xprt->stat.pending_u);
2485}
2486
2487/*
2488 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2489 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2490 * to use the server side send routines.
2491 */
2492static int bc_malloc(struct rpc_task *task)
2493{
2494 struct rpc_rqst *rqst = task->tk_rqstp;
2495 size_t size = rqst->rq_callsize;
2496 struct page *page;
2497 struct rpc_buffer *buf;
2498
2499 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2500 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2501 size);
2502 return -EINVAL;
2503 }
2504
2505 page = alloc_page(GFP_KERNEL);
2506 if (!page)
2507 return -ENOMEM;
2508
2509 buf = page_address(page);
2510 buf->len = PAGE_SIZE;
2511
2512 rqst->rq_buffer = buf->data;
2513 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2514 return 0;
2515}
2516
2517/*
2518 * Free the space allocated in the bc_alloc routine
2519 */
2520static void bc_free(struct rpc_task *task)
2521{
2522 void *buffer = task->tk_rqstp->rq_buffer;
2523 struct rpc_buffer *buf;
2524
2525 buf = container_of(buffer, struct rpc_buffer, data);
2526 free_page((unsigned long)buf);
2527}
2528
2529static int bc_sendto(struct rpc_rqst *req)
2530{
2531 struct xdr_buf *xdr = &req->rq_snd_buf;
2532 struct sock_xprt *transport =
2533 container_of(req->rq_xprt, struct sock_xprt, xprt);
2534 struct msghdr msg = {
2535 .msg_flags = 0,
2536 };
2537 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2538 (u32)xdr->len);
2539 unsigned int sent = 0;
2540 int err;
2541
2542 req->rq_xtime = ktime_get();
2543 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2544 xdr_free_bvec(xdr);
2545 if (err < 0 || sent != (xdr->len + sizeof(marker)))
2546 return -EAGAIN;
2547 return sent;
2548}
2549
2550/**
2551 * bc_send_request - Send a backchannel Call on a TCP socket
2552 * @req: rpc_rqst containing Call message to be sent
2553 *
2554 * xpt_mutex ensures @rqstp's whole message is written to the socket
2555 * without interruption.
2556 *
2557 * Return values:
2558 * %0 if the message was sent successfully
2559 * %ENOTCONN if the message was not sent
2560 */
2561static int bc_send_request(struct rpc_rqst *req)
2562{
2563 struct svc_xprt *xprt;
2564 int len;
2565
2566 /*
2567 * Get the server socket associated with this callback xprt
2568 */
2569 xprt = req->rq_xprt->bc_xprt;
2570
2571 /*
2572 * Grab the mutex to serialize data as the connection is shared
2573 * with the fore channel
2574 */
2575 mutex_lock(&xprt->xpt_mutex);
2576 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2577 len = -ENOTCONN;
2578 else
2579 len = bc_sendto(req);
2580 mutex_unlock(&xprt->xpt_mutex);
2581
2582 if (len > 0)
2583 len = 0;
2584
2585 return len;
2586}
2587
2588/*
2589 * The close routine. Since this is client initiated, we do nothing
2590 */
2591
2592static void bc_close(struct rpc_xprt *xprt)
2593{
2594 xprt_disconnect_done(xprt);
2595}
2596
2597/*
2598 * The xprt destroy routine. Again, because this connection is client
2599 * initiated, we do nothing
2600 */
2601
2602static void bc_destroy(struct rpc_xprt *xprt)
2603{
2604 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2605
2606 xs_xprt_free(xprt);
2607 module_put(THIS_MODULE);
2608}
2609
2610static const struct rpc_xprt_ops xs_local_ops = {
2611 .reserve_xprt = xprt_reserve_xprt,
2612 .release_xprt = xprt_release_xprt,
2613 .alloc_slot = xprt_alloc_slot,
2614 .free_slot = xprt_free_slot,
2615 .rpcbind = xs_local_rpcbind,
2616 .set_port = xs_local_set_port,
2617 .connect = xs_local_connect,
2618 .buf_alloc = rpc_malloc,
2619 .buf_free = rpc_free,
2620 .prepare_request = xs_stream_prepare_request,
2621 .send_request = xs_local_send_request,
2622 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2623 .close = xs_close,
2624 .destroy = xs_destroy,
2625 .print_stats = xs_local_print_stats,
2626 .enable_swap = xs_enable_swap,
2627 .disable_swap = xs_disable_swap,
2628};
2629
2630static const struct rpc_xprt_ops xs_udp_ops = {
2631 .set_buffer_size = xs_udp_set_buffer_size,
2632 .reserve_xprt = xprt_reserve_xprt_cong,
2633 .release_xprt = xprt_release_xprt_cong,
2634 .alloc_slot = xprt_alloc_slot,
2635 .free_slot = xprt_free_slot,
2636 .rpcbind = rpcb_getport_async,
2637 .set_port = xs_set_port,
2638 .connect = xs_connect,
2639 .buf_alloc = rpc_malloc,
2640 .buf_free = rpc_free,
2641 .send_request = xs_udp_send_request,
2642 .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2643 .timer = xs_udp_timer,
2644 .release_request = xprt_release_rqst_cong,
2645 .close = xs_close,
2646 .destroy = xs_destroy,
2647 .print_stats = xs_udp_print_stats,
2648 .enable_swap = xs_enable_swap,
2649 .disable_swap = xs_disable_swap,
2650 .inject_disconnect = xs_inject_disconnect,
2651};
2652
2653static const struct rpc_xprt_ops xs_tcp_ops = {
2654 .reserve_xprt = xprt_reserve_xprt,
2655 .release_xprt = xprt_release_xprt,
2656 .alloc_slot = xprt_alloc_slot,
2657 .free_slot = xprt_free_slot,
2658 .rpcbind = rpcb_getport_async,
2659 .set_port = xs_set_port,
2660 .connect = xs_connect,
2661 .buf_alloc = rpc_malloc,
2662 .buf_free = rpc_free,
2663 .prepare_request = xs_stream_prepare_request,
2664 .send_request = xs_tcp_send_request,
2665 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2666 .close = xs_tcp_shutdown,
2667 .destroy = xs_destroy,
2668 .set_connect_timeout = xs_tcp_set_connect_timeout,
2669 .print_stats = xs_tcp_print_stats,
2670 .enable_swap = xs_enable_swap,
2671 .disable_swap = xs_disable_swap,
2672 .inject_disconnect = xs_inject_disconnect,
2673#ifdef CONFIG_SUNRPC_BACKCHANNEL
2674 .bc_setup = xprt_setup_bc,
2675 .bc_maxpayload = xs_tcp_bc_maxpayload,
2676 .bc_num_slots = xprt_bc_max_slots,
2677 .bc_free_rqst = xprt_free_bc_rqst,
2678 .bc_destroy = xprt_destroy_bc,
2679#endif
2680};
2681
2682/*
2683 * The rpc_xprt_ops for the server backchannel
2684 */
2685
2686static const struct rpc_xprt_ops bc_tcp_ops = {
2687 .reserve_xprt = xprt_reserve_xprt,
2688 .release_xprt = xprt_release_xprt,
2689 .alloc_slot = xprt_alloc_slot,
2690 .free_slot = xprt_free_slot,
2691 .buf_alloc = bc_malloc,
2692 .buf_free = bc_free,
2693 .send_request = bc_send_request,
2694 .wait_for_reply_request = xprt_wait_for_reply_request_def,
2695 .close = bc_close,
2696 .destroy = bc_destroy,
2697 .print_stats = xs_tcp_print_stats,
2698 .enable_swap = xs_enable_swap,
2699 .disable_swap = xs_disable_swap,
2700 .inject_disconnect = xs_inject_disconnect,
2701};
2702
2703static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2704{
2705 static const struct sockaddr_in sin = {
2706 .sin_family = AF_INET,
2707 .sin_addr.s_addr = htonl(INADDR_ANY),
2708 };
2709 static const struct sockaddr_in6 sin6 = {
2710 .sin6_family = AF_INET6,
2711 .sin6_addr = IN6ADDR_ANY_INIT,
2712 };
2713
2714 switch (family) {
2715 case AF_LOCAL:
2716 break;
2717 case AF_INET:
2718 memcpy(sap, &sin, sizeof(sin));
2719 break;
2720 case AF_INET6:
2721 memcpy(sap, &sin6, sizeof(sin6));
2722 break;
2723 default:
2724 dprintk("RPC: %s: Bad address family\n", __func__);
2725 return -EAFNOSUPPORT;
2726 }
2727 return 0;
2728}
2729
2730static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2731 unsigned int slot_table_size,
2732 unsigned int max_slot_table_size)
2733{
2734 struct rpc_xprt *xprt;
2735 struct sock_xprt *new;
2736
2737 if (args->addrlen > sizeof(xprt->addr)) {
2738 dprintk("RPC: xs_setup_xprt: address too large\n");
2739 return ERR_PTR(-EBADF);
2740 }
2741
2742 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2743 max_slot_table_size);
2744 if (xprt == NULL) {
2745 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2746 "rpc_xprt\n");
2747 return ERR_PTR(-ENOMEM);
2748 }
2749
2750 new = container_of(xprt, struct sock_xprt, xprt);
2751 mutex_init(&new->recv_mutex);
2752 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2753 xprt->addrlen = args->addrlen;
2754 if (args->srcaddr)
2755 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2756 else {
2757 int err;
2758 err = xs_init_anyaddr(args->dstaddr->sa_family,
2759 (struct sockaddr *)&new->srcaddr);
2760 if (err != 0) {
2761 xprt_free(xprt);
2762 return ERR_PTR(err);
2763 }
2764 }
2765
2766 return xprt;
2767}
2768
2769static const struct rpc_timeout xs_local_default_timeout = {
2770 .to_initval = 10 * HZ,
2771 .to_maxval = 10 * HZ,
2772 .to_retries = 2,
2773};
2774
2775/**
2776 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2777 * @args: rpc transport creation arguments
2778 *
2779 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2780 */
2781static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2782{
2783 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2784 struct sock_xprt *transport;
2785 struct rpc_xprt *xprt;
2786 struct rpc_xprt *ret;
2787
2788 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2789 xprt_max_tcp_slot_table_entries);
2790 if (IS_ERR(xprt))
2791 return xprt;
2792 transport = container_of(xprt, struct sock_xprt, xprt);
2793
2794 xprt->prot = 0;
2795 xprt->xprt_class = &xs_local_transport;
2796 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2797
2798 xprt->bind_timeout = XS_BIND_TO;
2799 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2800 xprt->idle_timeout = XS_IDLE_DISC_TO;
2801
2802 xprt->ops = &xs_local_ops;
2803 xprt->timeout = &xs_local_default_timeout;
2804
2805 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2806 INIT_WORK(&transport->error_worker, xs_error_handle);
2807 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2808
2809 switch (sun->sun_family) {
2810 case AF_LOCAL:
2811 if (sun->sun_path[0] != '/') {
2812 dprintk("RPC: bad AF_LOCAL address: %s\n",
2813 sun->sun_path);
2814 ret = ERR_PTR(-EINVAL);
2815 goto out_err;
2816 }
2817 xprt_set_bound(xprt);
2818 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2819 ret = ERR_PTR(xs_local_setup_socket(transport));
2820 if (ret)
2821 goto out_err;
2822 break;
2823 default:
2824 ret = ERR_PTR(-EAFNOSUPPORT);
2825 goto out_err;
2826 }
2827
2828 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2829 xprt->address_strings[RPC_DISPLAY_ADDR]);
2830
2831 if (try_module_get(THIS_MODULE))
2832 return xprt;
2833 ret = ERR_PTR(-EINVAL);
2834out_err:
2835 xs_xprt_free(xprt);
2836 return ret;
2837}
2838
2839static const struct rpc_timeout xs_udp_default_timeout = {
2840 .to_initval = 5 * HZ,
2841 .to_maxval = 30 * HZ,
2842 .to_increment = 5 * HZ,
2843 .to_retries = 5,
2844};
2845
2846/**
2847 * xs_setup_udp - Set up transport to use a UDP socket
2848 * @args: rpc transport creation arguments
2849 *
2850 */
2851static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2852{
2853 struct sockaddr *addr = args->dstaddr;
2854 struct rpc_xprt *xprt;
2855 struct sock_xprt *transport;
2856 struct rpc_xprt *ret;
2857
2858 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2859 xprt_udp_slot_table_entries);
2860 if (IS_ERR(xprt))
2861 return xprt;
2862 transport = container_of(xprt, struct sock_xprt, xprt);
2863
2864 xprt->prot = IPPROTO_UDP;
2865 xprt->xprt_class = &xs_udp_transport;
2866 /* XXX: header size can vary due to auth type, IPv6, etc. */
2867 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2868
2869 xprt->bind_timeout = XS_BIND_TO;
2870 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2871 xprt->idle_timeout = XS_IDLE_DISC_TO;
2872
2873 xprt->ops = &xs_udp_ops;
2874
2875 xprt->timeout = &xs_udp_default_timeout;
2876
2877 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2878 INIT_WORK(&transport->error_worker, xs_error_handle);
2879 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2880
2881 switch (addr->sa_family) {
2882 case AF_INET:
2883 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2884 xprt_set_bound(xprt);
2885
2886 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2887 break;
2888 case AF_INET6:
2889 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2890 xprt_set_bound(xprt);
2891
2892 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2893 break;
2894 default:
2895 ret = ERR_PTR(-EAFNOSUPPORT);
2896 goto out_err;
2897 }
2898
2899 if (xprt_bound(xprt))
2900 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2901 xprt->address_strings[RPC_DISPLAY_ADDR],
2902 xprt->address_strings[RPC_DISPLAY_PORT],
2903 xprt->address_strings[RPC_DISPLAY_PROTO]);
2904 else
2905 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2906 xprt->address_strings[RPC_DISPLAY_ADDR],
2907 xprt->address_strings[RPC_DISPLAY_PROTO]);
2908
2909 if (try_module_get(THIS_MODULE))
2910 return xprt;
2911 ret = ERR_PTR(-EINVAL);
2912out_err:
2913 xs_xprt_free(xprt);
2914 return ret;
2915}
2916
2917static const struct rpc_timeout xs_tcp_default_timeout = {
2918 .to_initval = 60 * HZ,
2919 .to_maxval = 60 * HZ,
2920 .to_retries = 2,
2921};
2922
2923/**
2924 * xs_setup_tcp - Set up transport to use a TCP socket
2925 * @args: rpc transport creation arguments
2926 *
2927 */
2928static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2929{
2930 struct sockaddr *addr = args->dstaddr;
2931 struct rpc_xprt *xprt;
2932 struct sock_xprt *transport;
2933 struct rpc_xprt *ret;
2934 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2935
2936 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2937 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2938
2939 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2940 max_slot_table_size);
2941 if (IS_ERR(xprt))
2942 return xprt;
2943 transport = container_of(xprt, struct sock_xprt, xprt);
2944
2945 xprt->prot = IPPROTO_TCP;
2946 xprt->xprt_class = &xs_tcp_transport;
2947 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2948
2949 xprt->bind_timeout = XS_BIND_TO;
2950 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2951 xprt->idle_timeout = XS_IDLE_DISC_TO;
2952
2953 xprt->ops = &xs_tcp_ops;
2954 xprt->timeout = &xs_tcp_default_timeout;
2955
2956 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
2957 xprt->connect_timeout = xprt->timeout->to_initval *
2958 (xprt->timeout->to_retries + 1);
2959
2960 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2961 INIT_WORK(&transport->error_worker, xs_error_handle);
2962 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
2963
2964 switch (addr->sa_family) {
2965 case AF_INET:
2966 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2967 xprt_set_bound(xprt);
2968
2969 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2970 break;
2971 case AF_INET6:
2972 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2973 xprt_set_bound(xprt);
2974
2975 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2976 break;
2977 default:
2978 ret = ERR_PTR(-EAFNOSUPPORT);
2979 goto out_err;
2980 }
2981
2982 if (xprt_bound(xprt))
2983 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2984 xprt->address_strings[RPC_DISPLAY_ADDR],
2985 xprt->address_strings[RPC_DISPLAY_PORT],
2986 xprt->address_strings[RPC_DISPLAY_PROTO]);
2987 else
2988 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2989 xprt->address_strings[RPC_DISPLAY_ADDR],
2990 xprt->address_strings[RPC_DISPLAY_PROTO]);
2991
2992 if (try_module_get(THIS_MODULE))
2993 return xprt;
2994 ret = ERR_PTR(-EINVAL);
2995out_err:
2996 xs_xprt_free(xprt);
2997 return ret;
2998}
2999
3000/**
3001 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3002 * @args: rpc transport creation arguments
3003 *
3004 */
3005static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3006{
3007 struct sockaddr *addr = args->dstaddr;
3008 struct rpc_xprt *xprt;
3009 struct sock_xprt *transport;
3010 struct svc_sock *bc_sock;
3011 struct rpc_xprt *ret;
3012
3013 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3014 xprt_tcp_slot_table_entries);
3015 if (IS_ERR(xprt))
3016 return xprt;
3017 transport = container_of(xprt, struct sock_xprt, xprt);
3018
3019 xprt->prot = IPPROTO_TCP;
3020 xprt->xprt_class = &xs_bc_tcp_transport;
3021 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3022 xprt->timeout = &xs_tcp_default_timeout;
3023
3024 /* backchannel */
3025 xprt_set_bound(xprt);
3026 xprt->bind_timeout = 0;
3027 xprt->reestablish_timeout = 0;
3028 xprt->idle_timeout = 0;
3029
3030 xprt->ops = &bc_tcp_ops;
3031
3032 switch (addr->sa_family) {
3033 case AF_INET:
3034 xs_format_peer_addresses(xprt, "tcp",
3035 RPCBIND_NETID_TCP);
3036 break;
3037 case AF_INET6:
3038 xs_format_peer_addresses(xprt, "tcp",
3039 RPCBIND_NETID_TCP6);
3040 break;
3041 default:
3042 ret = ERR_PTR(-EAFNOSUPPORT);
3043 goto out_err;
3044 }
3045
3046 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3047 xprt->address_strings[RPC_DISPLAY_ADDR],
3048 xprt->address_strings[RPC_DISPLAY_PORT],
3049 xprt->address_strings[RPC_DISPLAY_PROTO]);
3050
3051 /*
3052 * Once we've associated a backchannel xprt with a connection,
3053 * we want to keep it around as long as the connection lasts,
3054 * in case we need to start using it for a backchannel again;
3055 * this reference won't be dropped until bc_xprt is destroyed.
3056 */
3057 xprt_get(xprt);
3058 args->bc_xprt->xpt_bc_xprt = xprt;
3059 xprt->bc_xprt = args->bc_xprt;
3060 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3061 transport->sock = bc_sock->sk_sock;
3062 transport->inet = bc_sock->sk_sk;
3063
3064 /*
3065 * Since we don't want connections for the backchannel, we set
3066 * the xprt status to connected
3067 */
3068 xprt_set_connected(xprt);
3069
3070 if (try_module_get(THIS_MODULE))
3071 return xprt;
3072
3073 args->bc_xprt->xpt_bc_xprt = NULL;
3074 args->bc_xprt->xpt_bc_xps = NULL;
3075 xprt_put(xprt);
3076 ret = ERR_PTR(-EINVAL);
3077out_err:
3078 xs_xprt_free(xprt);
3079 return ret;
3080}
3081
3082static struct xprt_class xs_local_transport = {
3083 .list = LIST_HEAD_INIT(xs_local_transport.list),
3084 .name = "named UNIX socket",
3085 .owner = THIS_MODULE,
3086 .ident = XPRT_TRANSPORT_LOCAL,
3087 .setup = xs_setup_local,
3088 .netid = { "" },
3089};
3090
3091static struct xprt_class xs_udp_transport = {
3092 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3093 .name = "udp",
3094 .owner = THIS_MODULE,
3095 .ident = XPRT_TRANSPORT_UDP,
3096 .setup = xs_setup_udp,
3097 .netid = { "udp", "udp6", "" },
3098};
3099
3100static struct xprt_class xs_tcp_transport = {
3101 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3102 .name = "tcp",
3103 .owner = THIS_MODULE,
3104 .ident = XPRT_TRANSPORT_TCP,
3105 .setup = xs_setup_tcp,
3106 .netid = { "tcp", "tcp6", "" },
3107};
3108
3109static struct xprt_class xs_bc_tcp_transport = {
3110 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3111 .name = "tcp NFSv4.1 backchannel",
3112 .owner = THIS_MODULE,
3113 .ident = XPRT_TRANSPORT_BC_TCP,
3114 .setup = xs_setup_bc_tcp,
3115 .netid = { "" },
3116};
3117
3118/**
3119 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3120 *
3121 */
3122int init_socket_xprt(void)
3123{
3124 if (!sunrpc_table_header)
3125 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3126
3127 xprt_register_transport(&xs_local_transport);
3128 xprt_register_transport(&xs_udp_transport);
3129 xprt_register_transport(&xs_tcp_transport);
3130 xprt_register_transport(&xs_bc_tcp_transport);
3131
3132 return 0;
3133}
3134
3135/**
3136 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3137 *
3138 */
3139void cleanup_socket_xprt(void)
3140{
3141 if (sunrpc_table_header) {
3142 unregister_sysctl_table(sunrpc_table_header);
3143 sunrpc_table_header = NULL;
3144 }
3145
3146 xprt_unregister_transport(&xs_local_transport);
3147 xprt_unregister_transport(&xs_udp_transport);
3148 xprt_unregister_transport(&xs_tcp_transport);
3149 xprt_unregister_transport(&xs_bc_tcp_transport);
3150}
3151
3152static int param_set_uint_minmax(const char *val,
3153 const struct kernel_param *kp,
3154 unsigned int min, unsigned int max)
3155{
3156 unsigned int num;
3157 int ret;
3158
3159 if (!val)
3160 return -EINVAL;
3161 ret = kstrtouint(val, 0, &num);
3162 if (ret)
3163 return ret;
3164 if (num < min || num > max)
3165 return -EINVAL;
3166 *((unsigned int *)kp->arg) = num;
3167 return 0;
3168}
3169
3170static int param_set_portnr(const char *val, const struct kernel_param *kp)
3171{
3172 return param_set_uint_minmax(val, kp,
3173 RPC_MIN_RESVPORT,
3174 RPC_MAX_RESVPORT);
3175}
3176
3177static const struct kernel_param_ops param_ops_portnr = {
3178 .set = param_set_portnr,
3179 .get = param_get_uint,
3180};
3181
3182#define param_check_portnr(name, p) \
3183 __param_check(name, p, unsigned int);
3184
3185module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3186module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3187
3188static int param_set_slot_table_size(const char *val,
3189 const struct kernel_param *kp)
3190{
3191 return param_set_uint_minmax(val, kp,
3192 RPC_MIN_SLOT_TABLE,
3193 RPC_MAX_SLOT_TABLE);
3194}
3195
3196static const struct kernel_param_ops param_ops_slot_table_size = {
3197 .set = param_set_slot_table_size,
3198 .get = param_get_uint,
3199};
3200
3201#define param_check_slot_table_size(name, p) \
3202 __param_check(name, p, unsigned int);
3203
3204static int param_set_max_slot_table_size(const char *val,
3205 const struct kernel_param *kp)
3206{
3207 return param_set_uint_minmax(val, kp,
3208 RPC_MIN_SLOT_TABLE,
3209 RPC_MAX_SLOT_TABLE_LIMIT);
3210}
3211
3212static const struct kernel_param_ops param_ops_max_slot_table_size = {
3213 .set = param_set_max_slot_table_size,
3214 .get = param_get_uint,
3215};
3216
3217#define param_check_max_slot_table_size(name, p) \
3218 __param_check(name, p, unsigned int);
3219
3220module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3221 slot_table_size, 0644);
3222module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3223 max_slot_table_size, 0644);
3224module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3225 slot_table_size, 0644);