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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
54 static void xs_close(struct rpc_xprt *xprt);
55
56 /*
57 * xprtsock tunables
58 */
59 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
62
63 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
65
66 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
67
68 #define XS_TCP_LINGER_TO (15U * HZ)
69 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
70
71 /*
72 * We can register our own files under /proc/sys/sunrpc by
73 * calling register_sysctl_table() again. The files in that
74 * directory become the union of all files registered there.
75 *
76 * We simply need to make sure that we don't collide with
77 * someone else's file names!
78 */
79
80 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
82 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
83 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
85
86 static struct ctl_table_header *sunrpc_table_header;
87
88 /*
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
91 */
92 static struct ctl_table xs_tunables_table[] = {
93 {
94 .procname = "udp_slot_table_entries",
95 .data = &xprt_udp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
98 .proc_handler = proc_dointvec_minmax,
99 .extra1 = &min_slot_table_size,
100 .extra2 = &max_slot_table_size
101 },
102 {
103 .procname = "tcp_slot_table_entries",
104 .data = &xprt_tcp_slot_table_entries,
105 .maxlen = sizeof(unsigned int),
106 .mode = 0644,
107 .proc_handler = proc_dointvec_minmax,
108 .extra1 = &min_slot_table_size,
109 .extra2 = &max_slot_table_size
110 },
111 {
112 .procname = "tcp_max_slot_table_entries",
113 .data = &xprt_max_tcp_slot_table_entries,
114 .maxlen = sizeof(unsigned int),
115 .mode = 0644,
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = &min_slot_table_size,
118 .extra2 = &max_tcp_slot_table_limit
119 },
120 {
121 .procname = "min_resvport",
122 .data = &xprt_min_resvport,
123 .maxlen = sizeof(unsigned int),
124 .mode = 0644,
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = &xprt_min_resvport_limit,
127 .extra2 = &xprt_max_resvport
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,
136 .extra2 = &xprt_max_resvport_limit
137 },
138 {
139 .procname = "tcp_fin_timeout",
140 .data = &xs_tcp_fin_timeout,
141 .maxlen = sizeof(xs_tcp_fin_timeout),
142 .mode = 0644,
143 .proc_handler = proc_dointvec_jiffies,
144 },
145 { },
146 };
147
148 static struct ctl_table sunrpc_table[] = {
149 {
150 .procname = "sunrpc",
151 .mode = 0555,
152 .child = xs_tunables_table
153 },
154 { },
155 };
156
157 #endif
158
159 /*
160 * Wait duration for a reply from the RPC portmapper.
161 */
162 #define XS_BIND_TO (60U * HZ)
163
164 /*
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
167 */
168 #define XS_UDP_REEST_TO (2U * HZ)
169
170 /*
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
173 *
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
178 */
179 #define XS_TCP_INIT_REEST_TO (3U * HZ)
180
181 /*
182 * TCP idle timeout; client drops the transport socket if it is idle
183 * for this long. Note that we also timeout UDP sockets to prevent
184 * holding port numbers when there is no RPC traffic.
185 */
186 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
187
188 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
189 # undef RPC_DEBUG_DATA
190 # define RPCDBG_FACILITY RPCDBG_TRANS
191 #endif
192
193 #ifdef RPC_DEBUG_DATA
194 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
195 {
196 u8 *buf = (u8 *) packet;
197 int j;
198
199 dprintk("RPC: %s\n", msg);
200 for (j = 0; j < count && j < 128; j += 4) {
201 if (!(j & 31)) {
202 if (j)
203 dprintk("\n");
204 dprintk("0x%04x ", j);
205 }
206 dprintk("%02x%02x%02x%02x ",
207 buf[j], buf[j+1], buf[j+2], buf[j+3]);
208 }
209 dprintk("\n");
210 }
211 #else
212 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
213 {
214 /* NOP */
215 }
216 #endif
217
218 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
219 {
220 return (struct rpc_xprt *) sk->sk_user_data;
221 }
222
223 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
224 {
225 return (struct sockaddr *) &xprt->addr;
226 }
227
228 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
229 {
230 return (struct sockaddr_un *) &xprt->addr;
231 }
232
233 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
234 {
235 return (struct sockaddr_in *) &xprt->addr;
236 }
237
238 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
239 {
240 return (struct sockaddr_in6 *) &xprt->addr;
241 }
242
243 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
244 {
245 struct sockaddr *sap = xs_addr(xprt);
246 struct sockaddr_in6 *sin6;
247 struct sockaddr_in *sin;
248 struct sockaddr_un *sun;
249 char buf[128];
250
251 switch (sap->sa_family) {
252 case AF_LOCAL:
253 sun = xs_addr_un(xprt);
254 strlcpy(buf, sun->sun_path, sizeof(buf));
255 xprt->address_strings[RPC_DISPLAY_ADDR] =
256 kstrdup(buf, GFP_KERNEL);
257 break;
258 case AF_INET:
259 (void)rpc_ntop(sap, buf, sizeof(buf));
260 xprt->address_strings[RPC_DISPLAY_ADDR] =
261 kstrdup(buf, GFP_KERNEL);
262 sin = xs_addr_in(xprt);
263 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
264 break;
265 case AF_INET6:
266 (void)rpc_ntop(sap, buf, sizeof(buf));
267 xprt->address_strings[RPC_DISPLAY_ADDR] =
268 kstrdup(buf, GFP_KERNEL);
269 sin6 = xs_addr_in6(xprt);
270 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
271 break;
272 default:
273 BUG();
274 }
275
276 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
277 }
278
279 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
280 {
281 struct sockaddr *sap = xs_addr(xprt);
282 char buf[128];
283
284 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
285 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
286
287 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
288 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
289 }
290
291 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
292 const char *protocol,
293 const char *netid)
294 {
295 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
296 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
297 xs_format_common_peer_addresses(xprt);
298 xs_format_common_peer_ports(xprt);
299 }
300
301 static void xs_update_peer_port(struct rpc_xprt *xprt)
302 {
303 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
304 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
305
306 xs_format_common_peer_ports(xprt);
307 }
308
309 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
310 {
311 unsigned int i;
312
313 for (i = 0; i < RPC_DISPLAY_MAX; i++)
314 switch (i) {
315 case RPC_DISPLAY_PROTO:
316 case RPC_DISPLAY_NETID:
317 continue;
318 default:
319 kfree(xprt->address_strings[i]);
320 }
321 }
322
323 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
324
325 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
326 {
327 struct msghdr msg = {
328 .msg_name = addr,
329 .msg_namelen = addrlen,
330 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
331 };
332 struct kvec iov = {
333 .iov_base = vec->iov_base + base,
334 .iov_len = vec->iov_len - base,
335 };
336
337 if (iov.iov_len != 0)
338 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
339 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
340 }
341
342 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
343 {
344 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
345 int offset, size_t size, int flags);
346 struct page **ppage;
347 unsigned int remainder;
348 int err;
349
350 remainder = xdr->page_len - base;
351 base += xdr->page_base;
352 ppage = xdr->pages + (base >> PAGE_SHIFT);
353 base &= ~PAGE_MASK;
354 do_sendpage = sock->ops->sendpage;
355 if (!zerocopy)
356 do_sendpage = sock_no_sendpage;
357 for(;;) {
358 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
359 int flags = XS_SENDMSG_FLAGS;
360
361 remainder -= len;
362 if (more)
363 flags |= MSG_MORE;
364 if (remainder != 0)
365 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
366 err = do_sendpage(sock, *ppage, base, len, flags);
367 if (remainder == 0 || err != len)
368 break;
369 *sent_p += err;
370 ppage++;
371 base = 0;
372 }
373 if (err > 0) {
374 *sent_p += err;
375 err = 0;
376 }
377 return err;
378 }
379
380 /**
381 * xs_sendpages - write pages directly to a socket
382 * @sock: socket to send on
383 * @addr: UDP only -- address of destination
384 * @addrlen: UDP only -- length of destination address
385 * @xdr: buffer containing this request
386 * @base: starting position in the buffer
387 * @zerocopy: true if it is safe to use sendpage()
388 * @sent_p: return the total number of bytes successfully queued for sending
389 *
390 */
391 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
392 {
393 unsigned int remainder = xdr->len - base;
394 int err = 0;
395 int sent = 0;
396
397 if (unlikely(!sock))
398 return -ENOTSOCK;
399
400 if (base != 0) {
401 addr = NULL;
402 addrlen = 0;
403 }
404
405 if (base < xdr->head[0].iov_len || addr != NULL) {
406 unsigned int len = xdr->head[0].iov_len - base;
407 remainder -= len;
408 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
409 if (remainder == 0 || err != len)
410 goto out;
411 *sent_p += err;
412 base = 0;
413 } else
414 base -= xdr->head[0].iov_len;
415
416 if (base < xdr->page_len) {
417 unsigned int len = xdr->page_len - base;
418 remainder -= len;
419 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
420 *sent_p += sent;
421 if (remainder == 0 || sent != len)
422 goto out;
423 base = 0;
424 } else
425 base -= xdr->page_len;
426
427 if (base >= xdr->tail[0].iov_len)
428 return 0;
429 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
430 out:
431 if (err > 0) {
432 *sent_p += err;
433 err = 0;
434 }
435 return err;
436 }
437
438 static void xs_nospace_callback(struct rpc_task *task)
439 {
440 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
441
442 transport->inet->sk_write_pending--;
443 }
444
445 /**
446 * xs_nospace - place task on wait queue if transmit was incomplete
447 * @task: task to put to sleep
448 *
449 */
450 static int xs_nospace(struct rpc_task *task)
451 {
452 struct rpc_rqst *req = task->tk_rqstp;
453 struct rpc_xprt *xprt = req->rq_xprt;
454 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
455 struct sock *sk = transport->inet;
456 int ret = -EAGAIN;
457
458 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
459 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
460 req->rq_slen);
461
462 /* Protect against races with write_space */
463 spin_lock_bh(&xprt->transport_lock);
464
465 /* Don't race with disconnect */
466 if (xprt_connected(xprt)) {
467 /* wait for more buffer space */
468 sk->sk_write_pending++;
469 xprt_wait_for_buffer_space(task, xs_nospace_callback);
470 } else
471 ret = -ENOTCONN;
472
473 spin_unlock_bh(&xprt->transport_lock);
474
475 /* Race breaker in case memory is freed before above code is called */
476 if (ret == -EAGAIN) {
477 struct socket_wq *wq;
478
479 rcu_read_lock();
480 wq = rcu_dereference(sk->sk_wq);
481 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
482 rcu_read_unlock();
483
484 sk->sk_write_space(sk);
485 }
486 return ret;
487 }
488
489 /*
490 * Construct a stream transport record marker in @buf.
491 */
492 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
493 {
494 u32 reclen = buf->len - sizeof(rpc_fraghdr);
495 rpc_fraghdr *base = buf->head[0].iov_base;
496 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
497 }
498
499 /**
500 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
501 * @task: RPC task that manages the state of an RPC request
502 *
503 * Return values:
504 * 0: The request has been sent
505 * EAGAIN: The socket was blocked, please call again later to
506 * complete the request
507 * ENOTCONN: Caller needs to invoke connect logic then call again
508 * other: Some other error occured, the request was not sent
509 */
510 static int xs_local_send_request(struct rpc_task *task)
511 {
512 struct rpc_rqst *req = task->tk_rqstp;
513 struct rpc_xprt *xprt = req->rq_xprt;
514 struct sock_xprt *transport =
515 container_of(xprt, struct sock_xprt, xprt);
516 struct xdr_buf *xdr = &req->rq_snd_buf;
517 int status;
518 int sent = 0;
519
520 xs_encode_stream_record_marker(&req->rq_snd_buf);
521
522 xs_pktdump("packet data:",
523 req->rq_svec->iov_base, req->rq_svec->iov_len);
524
525 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
526 true, &sent);
527 dprintk("RPC: %s(%u) = %d\n",
528 __func__, xdr->len - req->rq_bytes_sent, status);
529
530 if (status == -EAGAIN && sock_writeable(transport->inet))
531 status = -ENOBUFS;
532
533 if (likely(sent > 0) || status == 0) {
534 req->rq_bytes_sent += sent;
535 req->rq_xmit_bytes_sent += sent;
536 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
537 req->rq_bytes_sent = 0;
538 return 0;
539 }
540 status = -EAGAIN;
541 }
542
543 switch (status) {
544 case -ENOBUFS:
545 break;
546 case -EAGAIN:
547 status = xs_nospace(task);
548 break;
549 default:
550 dprintk("RPC: sendmsg returned unrecognized error %d\n",
551 -status);
552 case -EPIPE:
553 xs_close(xprt);
554 status = -ENOTCONN;
555 }
556
557 return status;
558 }
559
560 /**
561 * xs_udp_send_request - write an RPC request to a UDP socket
562 * @task: address of RPC task that manages the state of an RPC request
563 *
564 * Return values:
565 * 0: The request has been sent
566 * EAGAIN: The socket was blocked, please call again later to
567 * complete the request
568 * ENOTCONN: Caller needs to invoke connect logic then call again
569 * other: Some other error occurred, the request was not sent
570 */
571 static int xs_udp_send_request(struct rpc_task *task)
572 {
573 struct rpc_rqst *req = task->tk_rqstp;
574 struct rpc_xprt *xprt = req->rq_xprt;
575 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
576 struct xdr_buf *xdr = &req->rq_snd_buf;
577 int sent = 0;
578 int status;
579
580 xs_pktdump("packet data:",
581 req->rq_svec->iov_base,
582 req->rq_svec->iov_len);
583
584 if (!xprt_bound(xprt))
585 return -ENOTCONN;
586 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
587 xdr, req->rq_bytes_sent, true, &sent);
588
589 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
590 xdr->len - req->rq_bytes_sent, status);
591
592 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
593 if (status == -EPERM)
594 goto process_status;
595
596 if (status == -EAGAIN && sock_writeable(transport->inet))
597 status = -ENOBUFS;
598
599 if (sent > 0 || status == 0) {
600 req->rq_xmit_bytes_sent += sent;
601 if (sent >= req->rq_slen)
602 return 0;
603 /* Still some bytes left; set up for a retry later. */
604 status = -EAGAIN;
605 }
606
607 process_status:
608 switch (status) {
609 case -ENOTSOCK:
610 status = -ENOTCONN;
611 /* Should we call xs_close() here? */
612 break;
613 case -EAGAIN:
614 status = xs_nospace(task);
615 break;
616 case -ENETUNREACH:
617 case -ENOBUFS:
618 case -EPIPE:
619 case -ECONNREFUSED:
620 case -EPERM:
621 /* When the server has died, an ICMP port unreachable message
622 * prompts ECONNREFUSED. */
623 break;
624 default:
625 dprintk("RPC: sendmsg returned unrecognized error %d\n",
626 -status);
627 }
628
629 return status;
630 }
631
632 /**
633 * xs_tcp_send_request - write an RPC request to a TCP socket
634 * @task: address of RPC task that manages the state of an RPC request
635 *
636 * Return values:
637 * 0: The request has been sent
638 * EAGAIN: The socket was blocked, please call again later to
639 * complete the request
640 * ENOTCONN: Caller needs to invoke connect logic then call again
641 * other: Some other error occurred, the request was not sent
642 *
643 * XXX: In the case of soft timeouts, should we eventually give up
644 * if sendmsg is not able to make progress?
645 */
646 static int xs_tcp_send_request(struct rpc_task *task)
647 {
648 struct rpc_rqst *req = task->tk_rqstp;
649 struct rpc_xprt *xprt = req->rq_xprt;
650 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
651 struct xdr_buf *xdr = &req->rq_snd_buf;
652 bool zerocopy = true;
653 bool vm_wait = false;
654 int status;
655 int sent;
656
657 xs_encode_stream_record_marker(&req->rq_snd_buf);
658
659 xs_pktdump("packet data:",
660 req->rq_svec->iov_base,
661 req->rq_svec->iov_len);
662 /* Don't use zero copy if this is a resend. If the RPC call
663 * completes while the socket holds a reference to the pages,
664 * then we may end up resending corrupted data.
665 */
666 if (task->tk_flags & RPC_TASK_SENT)
667 zerocopy = false;
668
669 /* Continue transmitting the packet/record. We must be careful
670 * to cope with writespace callbacks arriving _after_ we have
671 * called sendmsg(). */
672 while (1) {
673 sent = 0;
674 status = xs_sendpages(transport->sock, NULL, 0, xdr,
675 req->rq_bytes_sent, zerocopy, &sent);
676
677 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
678 xdr->len - req->rq_bytes_sent, status);
679
680 /* If we've sent the entire packet, immediately
681 * reset the count of bytes sent. */
682 req->rq_bytes_sent += sent;
683 req->rq_xmit_bytes_sent += sent;
684 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
685 req->rq_bytes_sent = 0;
686 return 0;
687 }
688
689 WARN_ON_ONCE(sent == 0 && status == 0);
690
691 if (status == -EAGAIN ) {
692 /*
693 * Return EAGAIN if we're sure we're hitting the
694 * socket send buffer limits.
695 */
696 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
697 break;
698 /*
699 * Did we hit a memory allocation failure?
700 */
701 if (sent == 0) {
702 status = -ENOBUFS;
703 if (vm_wait)
704 break;
705 /* Retry, knowing now that we're below the
706 * socket send buffer limit
707 */
708 vm_wait = true;
709 }
710 continue;
711 }
712 if (status < 0)
713 break;
714 vm_wait = false;
715 }
716
717 switch (status) {
718 case -ENOTSOCK:
719 status = -ENOTCONN;
720 /* Should we call xs_close() here? */
721 break;
722 case -EAGAIN:
723 status = xs_nospace(task);
724 break;
725 case -ECONNRESET:
726 case -ECONNREFUSED:
727 case -ENOTCONN:
728 case -EADDRINUSE:
729 case -ENOBUFS:
730 case -EPIPE:
731 break;
732 default:
733 dprintk("RPC: sendmsg returned unrecognized error %d\n",
734 -status);
735 }
736
737 return status;
738 }
739
740 /**
741 * xs_tcp_release_xprt - clean up after a tcp transmission
742 * @xprt: transport
743 * @task: rpc task
744 *
745 * This cleans up if an error causes us to abort the transmission of a request.
746 * In this case, the socket may need to be reset in order to avoid confusing
747 * the server.
748 */
749 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
750 {
751 struct rpc_rqst *req;
752
753 if (task != xprt->snd_task)
754 return;
755 if (task == NULL)
756 goto out_release;
757 req = task->tk_rqstp;
758 if (req == NULL)
759 goto out_release;
760 if (req->rq_bytes_sent == 0)
761 goto out_release;
762 if (req->rq_bytes_sent == req->rq_snd_buf.len)
763 goto out_release;
764 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
765 out_release:
766 xprt_release_xprt(xprt, task);
767 }
768
769 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
770 {
771 transport->old_data_ready = sk->sk_data_ready;
772 transport->old_state_change = sk->sk_state_change;
773 transport->old_write_space = sk->sk_write_space;
774 transport->old_error_report = sk->sk_error_report;
775 }
776
777 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
778 {
779 sk->sk_data_ready = transport->old_data_ready;
780 sk->sk_state_change = transport->old_state_change;
781 sk->sk_write_space = transport->old_write_space;
782 sk->sk_error_report = transport->old_error_report;
783 }
784
785 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
786 {
787 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
788
789 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
790 }
791
792 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
793 {
794 smp_mb__before_atomic();
795 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
796 clear_bit(XPRT_CLOSING, &xprt->state);
797 xs_sock_reset_state_flags(xprt);
798 smp_mb__after_atomic();
799 }
800
801 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
802 {
803 xs_sock_reset_connection_flags(xprt);
804 /* Mark transport as closed and wake up all pending tasks */
805 xprt_disconnect_done(xprt);
806 }
807
808 /**
809 * xs_error_report - callback to handle TCP socket state errors
810 * @sk: socket
811 *
812 * Note: we don't call sock_error() since there may be a rpc_task
813 * using the socket, and so we don't want to clear sk->sk_err.
814 */
815 static void xs_error_report(struct sock *sk)
816 {
817 struct rpc_xprt *xprt;
818 int err;
819
820 read_lock_bh(&sk->sk_callback_lock);
821 if (!(xprt = xprt_from_sock(sk)))
822 goto out;
823
824 err = -sk->sk_err;
825 if (err == 0)
826 goto out;
827 /* Is this a reset event? */
828 if (sk->sk_state == TCP_CLOSE)
829 xs_sock_mark_closed(xprt);
830 dprintk("RPC: xs_error_report client %p, error=%d...\n",
831 xprt, -err);
832 trace_rpc_socket_error(xprt, sk->sk_socket, err);
833 xprt_wake_pending_tasks(xprt, err);
834 out:
835 read_unlock_bh(&sk->sk_callback_lock);
836 }
837
838 static void xs_reset_transport(struct sock_xprt *transport)
839 {
840 struct socket *sock = transport->sock;
841 struct sock *sk = transport->inet;
842 struct rpc_xprt *xprt = &transport->xprt;
843
844 if (sk == NULL)
845 return;
846
847 if (atomic_read(&transport->xprt.swapper))
848 sk_clear_memalloc(sk);
849
850 kernel_sock_shutdown(sock, SHUT_RDWR);
851
852 mutex_lock(&transport->recv_mutex);
853 write_lock_bh(&sk->sk_callback_lock);
854 transport->inet = NULL;
855 transport->sock = NULL;
856
857 sk->sk_user_data = NULL;
858
859 xs_restore_old_callbacks(transport, sk);
860 xprt_clear_connected(xprt);
861 write_unlock_bh(&sk->sk_callback_lock);
862 xs_sock_reset_connection_flags(xprt);
863 mutex_unlock(&transport->recv_mutex);
864
865 trace_rpc_socket_close(xprt, sock);
866 sock_release(sock);
867 }
868
869 /**
870 * xs_close - close a socket
871 * @xprt: transport
872 *
873 * This is used when all requests are complete; ie, no DRC state remains
874 * on the server we want to save.
875 *
876 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
877 * xs_reset_transport() zeroing the socket from underneath a writer.
878 */
879 static void xs_close(struct rpc_xprt *xprt)
880 {
881 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
882
883 dprintk("RPC: xs_close xprt %p\n", xprt);
884
885 xs_reset_transport(transport);
886 xprt->reestablish_timeout = 0;
887
888 xprt_disconnect_done(xprt);
889 }
890
891 static void xs_inject_disconnect(struct rpc_xprt *xprt)
892 {
893 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
894 xprt);
895 xprt_disconnect_done(xprt);
896 }
897
898 static void xs_xprt_free(struct rpc_xprt *xprt)
899 {
900 xs_free_peer_addresses(xprt);
901 xprt_free(xprt);
902 }
903
904 /**
905 * xs_destroy - prepare to shutdown a transport
906 * @xprt: doomed transport
907 *
908 */
909 static void xs_destroy(struct rpc_xprt *xprt)
910 {
911 struct sock_xprt *transport = container_of(xprt,
912 struct sock_xprt, xprt);
913 dprintk("RPC: xs_destroy xprt %p\n", xprt);
914
915 cancel_delayed_work_sync(&transport->connect_worker);
916 xs_close(xprt);
917 cancel_work_sync(&transport->recv_worker);
918 xs_xprt_free(xprt);
919 module_put(THIS_MODULE);
920 }
921
922 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
923 {
924 struct xdr_skb_reader desc = {
925 .skb = skb,
926 .offset = sizeof(rpc_fraghdr),
927 .count = skb->len - sizeof(rpc_fraghdr),
928 };
929
930 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
931 return -1;
932 if (desc.count)
933 return -1;
934 return 0;
935 }
936
937 /**
938 * xs_local_data_read_skb
939 * @xprt: transport
940 * @sk: socket
941 * @skb: skbuff
942 *
943 * Currently this assumes we can read the whole reply in a single gulp.
944 */
945 static void xs_local_data_read_skb(struct rpc_xprt *xprt,
946 struct sock *sk,
947 struct sk_buff *skb)
948 {
949 struct rpc_task *task;
950 struct rpc_rqst *rovr;
951 int repsize, copied;
952 u32 _xid;
953 __be32 *xp;
954
955 repsize = skb->len - sizeof(rpc_fraghdr);
956 if (repsize < 4) {
957 dprintk("RPC: impossible RPC reply size %d\n", repsize);
958 return;
959 }
960
961 /* Copy the XID from the skb... */
962 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
963 if (xp == NULL)
964 return;
965
966 /* Look up and lock the request corresponding to the given XID */
967 spin_lock_bh(&xprt->transport_lock);
968 rovr = xprt_lookup_rqst(xprt, *xp);
969 if (!rovr)
970 goto out_unlock;
971 task = rovr->rq_task;
972
973 copied = rovr->rq_private_buf.buflen;
974 if (copied > repsize)
975 copied = repsize;
976
977 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
978 dprintk("RPC: sk_buff copy failed\n");
979 goto out_unlock;
980 }
981
982 xprt_complete_rqst(task, copied);
983
984 out_unlock:
985 spin_unlock_bh(&xprt->transport_lock);
986 }
987
988 static void xs_local_data_receive(struct sock_xprt *transport)
989 {
990 struct sk_buff *skb;
991 struct sock *sk;
992 int err;
993
994 mutex_lock(&transport->recv_mutex);
995 sk = transport->inet;
996 if (sk == NULL)
997 goto out;
998 for (;;) {
999 skb = skb_recv_datagram(sk, 0, 1, &err);
1000 if (skb != NULL) {
1001 xs_local_data_read_skb(&transport->xprt, sk, skb);
1002 skb_free_datagram(sk, skb);
1003 continue;
1004 }
1005 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1006 break;
1007 }
1008 out:
1009 mutex_unlock(&transport->recv_mutex);
1010 }
1011
1012 static void xs_local_data_receive_workfn(struct work_struct *work)
1013 {
1014 struct sock_xprt *transport =
1015 container_of(work, struct sock_xprt, recv_worker);
1016 xs_local_data_receive(transport);
1017 }
1018
1019 /**
1020 * xs_udp_data_read_skb - receive callback for UDP sockets
1021 * @xprt: transport
1022 * @sk: socket
1023 * @skb: skbuff
1024 *
1025 */
1026 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1027 struct sock *sk,
1028 struct sk_buff *skb)
1029 {
1030 struct rpc_task *task;
1031 struct rpc_rqst *rovr;
1032 int repsize, copied;
1033 u32 _xid;
1034 __be32 *xp;
1035
1036 repsize = skb->len;
1037 if (repsize < 4) {
1038 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1039 return;
1040 }
1041
1042 /* Copy the XID from the skb... */
1043 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1044 if (xp == NULL)
1045 return;
1046
1047 /* Look up and lock the request corresponding to the given XID */
1048 spin_lock_bh(&xprt->transport_lock);
1049 rovr = xprt_lookup_rqst(xprt, *xp);
1050 if (!rovr)
1051 goto out_unlock;
1052 task = rovr->rq_task;
1053
1054 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1055 copied = repsize;
1056
1057 /* Suck it into the iovec, verify checksum if not done by hw. */
1058 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1059 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1060 goto out_unlock;
1061 }
1062
1063 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1064
1065 xprt_adjust_cwnd(xprt, task, copied);
1066 xprt_complete_rqst(task, copied);
1067
1068 out_unlock:
1069 spin_unlock_bh(&xprt->transport_lock);
1070 }
1071
1072 static void xs_udp_data_receive(struct sock_xprt *transport)
1073 {
1074 struct sk_buff *skb;
1075 struct sock *sk;
1076 int err;
1077
1078 mutex_lock(&transport->recv_mutex);
1079 sk = transport->inet;
1080 if (sk == NULL)
1081 goto out;
1082 for (;;) {
1083 skb = skb_recv_datagram(sk, 0, 1, &err);
1084 if (skb != NULL) {
1085 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1086 skb_free_datagram_locked(sk, skb);
1087 continue;
1088 }
1089 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1090 break;
1091 }
1092 out:
1093 mutex_unlock(&transport->recv_mutex);
1094 }
1095
1096 static void xs_udp_data_receive_workfn(struct work_struct *work)
1097 {
1098 struct sock_xprt *transport =
1099 container_of(work, struct sock_xprt, recv_worker);
1100 xs_udp_data_receive(transport);
1101 }
1102
1103 /**
1104 * xs_data_ready - "data ready" callback for UDP sockets
1105 * @sk: socket with data to read
1106 *
1107 */
1108 static void xs_data_ready(struct sock *sk)
1109 {
1110 struct rpc_xprt *xprt;
1111
1112 read_lock_bh(&sk->sk_callback_lock);
1113 dprintk("RPC: xs_data_ready...\n");
1114 xprt = xprt_from_sock(sk);
1115 if (xprt != NULL) {
1116 struct sock_xprt *transport = container_of(xprt,
1117 struct sock_xprt, xprt);
1118 transport->old_data_ready(sk);
1119 /* Any data means we had a useful conversation, so
1120 * then we don't need to delay the next reconnect
1121 */
1122 if (xprt->reestablish_timeout)
1123 xprt->reestablish_timeout = 0;
1124 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1125 queue_work(xprtiod_workqueue, &transport->recv_worker);
1126 }
1127 read_unlock_bh(&sk->sk_callback_lock);
1128 }
1129
1130 /*
1131 * Helper function to force a TCP close if the server is sending
1132 * junk and/or it has put us in CLOSE_WAIT
1133 */
1134 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1135 {
1136 xprt_force_disconnect(xprt);
1137 }
1138
1139 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1140 {
1141 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1142 size_t len, used;
1143 char *p;
1144
1145 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1146 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1147 used = xdr_skb_read_bits(desc, p, len);
1148 transport->tcp_offset += used;
1149 if (used != len)
1150 return;
1151
1152 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1153 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1154 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1155 else
1156 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1157 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1158
1159 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1160 transport->tcp_offset = 0;
1161
1162 /* Sanity check of the record length */
1163 if (unlikely(transport->tcp_reclen < 8)) {
1164 dprintk("RPC: invalid TCP record fragment length\n");
1165 xs_tcp_force_close(xprt);
1166 return;
1167 }
1168 dprintk("RPC: reading TCP record fragment of length %d\n",
1169 transport->tcp_reclen);
1170 }
1171
1172 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1173 {
1174 if (transport->tcp_offset == transport->tcp_reclen) {
1175 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1176 transport->tcp_offset = 0;
1177 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1178 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1179 transport->tcp_flags |= TCP_RCV_COPY_XID;
1180 transport->tcp_copied = 0;
1181 }
1182 }
1183 }
1184
1185 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1186 {
1187 size_t len, used;
1188 char *p;
1189
1190 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1191 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1192 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1193 used = xdr_skb_read_bits(desc, p, len);
1194 transport->tcp_offset += used;
1195 if (used != len)
1196 return;
1197 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1198 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1199 transport->tcp_copied = 4;
1200 dprintk("RPC: reading %s XID %08x\n",
1201 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1202 : "request with",
1203 ntohl(transport->tcp_xid));
1204 xs_tcp_check_fraghdr(transport);
1205 }
1206
1207 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1208 struct xdr_skb_reader *desc)
1209 {
1210 size_t len, used;
1211 u32 offset;
1212 char *p;
1213
1214 /*
1215 * We want transport->tcp_offset to be 8 at the end of this routine
1216 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1217 * When this function is called for the first time,
1218 * transport->tcp_offset is 4 (after having already read the xid).
1219 */
1220 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1221 len = sizeof(transport->tcp_calldir) - offset;
1222 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1223 p = ((char *) &transport->tcp_calldir) + offset;
1224 used = xdr_skb_read_bits(desc, p, len);
1225 transport->tcp_offset += used;
1226 if (used != len)
1227 return;
1228 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1229 /*
1230 * We don't yet have the XDR buffer, so we will write the calldir
1231 * out after we get the buffer from the 'struct rpc_rqst'
1232 */
1233 switch (ntohl(transport->tcp_calldir)) {
1234 case RPC_REPLY:
1235 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1236 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1237 transport->tcp_flags |= TCP_RPC_REPLY;
1238 break;
1239 case RPC_CALL:
1240 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1241 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1242 transport->tcp_flags &= ~TCP_RPC_REPLY;
1243 break;
1244 default:
1245 dprintk("RPC: invalid request message type\n");
1246 xs_tcp_force_close(&transport->xprt);
1247 }
1248 xs_tcp_check_fraghdr(transport);
1249 }
1250
1251 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1252 struct xdr_skb_reader *desc,
1253 struct rpc_rqst *req)
1254 {
1255 struct sock_xprt *transport =
1256 container_of(xprt, struct sock_xprt, xprt);
1257 struct xdr_buf *rcvbuf;
1258 size_t len;
1259 ssize_t r;
1260
1261 rcvbuf = &req->rq_private_buf;
1262
1263 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1264 /*
1265 * Save the RPC direction in the XDR buffer
1266 */
1267 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1268 &transport->tcp_calldir,
1269 sizeof(transport->tcp_calldir));
1270 transport->tcp_copied += sizeof(transport->tcp_calldir);
1271 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1272 }
1273
1274 len = desc->count;
1275 if (len > transport->tcp_reclen - transport->tcp_offset) {
1276 struct xdr_skb_reader my_desc;
1277
1278 len = transport->tcp_reclen - transport->tcp_offset;
1279 memcpy(&my_desc, desc, sizeof(my_desc));
1280 my_desc.count = len;
1281 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1282 &my_desc, xdr_skb_read_bits);
1283 desc->count -= r;
1284 desc->offset += r;
1285 } else
1286 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1287 desc, xdr_skb_read_bits);
1288
1289 if (r > 0) {
1290 transport->tcp_copied += r;
1291 transport->tcp_offset += r;
1292 }
1293 if (r != len) {
1294 /* Error when copying to the receive buffer,
1295 * usually because we weren't able to allocate
1296 * additional buffer pages. All we can do now
1297 * is turn off TCP_RCV_COPY_DATA, so the request
1298 * will not receive any additional updates,
1299 * and time out.
1300 * Any remaining data from this record will
1301 * be discarded.
1302 */
1303 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1304 dprintk("RPC: XID %08x truncated request\n",
1305 ntohl(transport->tcp_xid));
1306 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1307 "tcp_offset = %u, tcp_reclen = %u\n",
1308 xprt, transport->tcp_copied,
1309 transport->tcp_offset, transport->tcp_reclen);
1310 return;
1311 }
1312
1313 dprintk("RPC: XID %08x read %Zd bytes\n",
1314 ntohl(transport->tcp_xid), r);
1315 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1316 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1317 transport->tcp_offset, transport->tcp_reclen);
1318
1319 if (transport->tcp_copied == req->rq_private_buf.buflen)
1320 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1321 else if (transport->tcp_offset == transport->tcp_reclen) {
1322 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1323 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1324 }
1325 }
1326
1327 /*
1328 * Finds the request corresponding to the RPC xid and invokes the common
1329 * tcp read code to read the data.
1330 */
1331 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1332 struct xdr_skb_reader *desc)
1333 {
1334 struct sock_xprt *transport =
1335 container_of(xprt, struct sock_xprt, xprt);
1336 struct rpc_rqst *req;
1337
1338 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1339
1340 /* Find and lock the request corresponding to this xid */
1341 spin_lock_bh(&xprt->transport_lock);
1342 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1343 if (!req) {
1344 dprintk("RPC: XID %08x request not found!\n",
1345 ntohl(transport->tcp_xid));
1346 spin_unlock_bh(&xprt->transport_lock);
1347 return -1;
1348 }
1349
1350 xs_tcp_read_common(xprt, desc, req);
1351
1352 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1353 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1354
1355 spin_unlock_bh(&xprt->transport_lock);
1356 return 0;
1357 }
1358
1359 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1360 /*
1361 * Obtains an rpc_rqst previously allocated and invokes the common
1362 * tcp read code to read the data. The result is placed in the callback
1363 * queue.
1364 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1365 * connection and return -1.
1366 */
1367 static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1368 struct xdr_skb_reader *desc)
1369 {
1370 struct sock_xprt *transport =
1371 container_of(xprt, struct sock_xprt, xprt);
1372 struct rpc_rqst *req;
1373
1374 /* Look up and lock the request corresponding to the given XID */
1375 spin_lock_bh(&xprt->transport_lock);
1376 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1377 if (req == NULL) {
1378 spin_unlock_bh(&xprt->transport_lock);
1379 printk(KERN_WARNING "Callback slot table overflowed\n");
1380 xprt_force_disconnect(xprt);
1381 return -1;
1382 }
1383
1384 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1385 xs_tcp_read_common(xprt, desc, req);
1386
1387 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1388 xprt_complete_bc_request(req, transport->tcp_copied);
1389 spin_unlock_bh(&xprt->transport_lock);
1390
1391 return 0;
1392 }
1393
1394 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1395 struct xdr_skb_reader *desc)
1396 {
1397 struct sock_xprt *transport =
1398 container_of(xprt, struct sock_xprt, xprt);
1399
1400 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1401 xs_tcp_read_reply(xprt, desc) :
1402 xs_tcp_read_callback(xprt, desc);
1403 }
1404
1405 static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
1406 {
1407 int ret;
1408
1409 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
1410 SVC_SOCK_ANONYMOUS);
1411 if (ret < 0)
1412 return ret;
1413 return 0;
1414 }
1415
1416 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1417 {
1418 return PAGE_SIZE;
1419 }
1420 #else
1421 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1422 struct xdr_skb_reader *desc)
1423 {
1424 return xs_tcp_read_reply(xprt, desc);
1425 }
1426 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1427
1428 /*
1429 * Read data off the transport. This can be either an RPC_CALL or an
1430 * RPC_REPLY. Relay the processing to helper functions.
1431 */
1432 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1433 struct xdr_skb_reader *desc)
1434 {
1435 struct sock_xprt *transport =
1436 container_of(xprt, struct sock_xprt, xprt);
1437
1438 if (_xs_tcp_read_data(xprt, desc) == 0)
1439 xs_tcp_check_fraghdr(transport);
1440 else {
1441 /*
1442 * The transport_lock protects the request handling.
1443 * There's no need to hold it to update the tcp_flags.
1444 */
1445 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1446 }
1447 }
1448
1449 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1450 {
1451 size_t len;
1452
1453 len = transport->tcp_reclen - transport->tcp_offset;
1454 if (len > desc->count)
1455 len = desc->count;
1456 desc->count -= len;
1457 desc->offset += len;
1458 transport->tcp_offset += len;
1459 dprintk("RPC: discarded %Zu bytes\n", len);
1460 xs_tcp_check_fraghdr(transport);
1461 }
1462
1463 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1464 {
1465 struct rpc_xprt *xprt = rd_desc->arg.data;
1466 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1467 struct xdr_skb_reader desc = {
1468 .skb = skb,
1469 .offset = offset,
1470 .count = len,
1471 };
1472
1473 dprintk("RPC: xs_tcp_data_recv started\n");
1474 do {
1475 trace_xs_tcp_data_recv(transport);
1476 /* Read in a new fragment marker if necessary */
1477 /* Can we ever really expect to get completely empty fragments? */
1478 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1479 xs_tcp_read_fraghdr(xprt, &desc);
1480 continue;
1481 }
1482 /* Read in the xid if necessary */
1483 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1484 xs_tcp_read_xid(transport, &desc);
1485 continue;
1486 }
1487 /* Read in the call/reply flag */
1488 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1489 xs_tcp_read_calldir(transport, &desc);
1490 continue;
1491 }
1492 /* Read in the request data */
1493 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1494 xs_tcp_read_data(xprt, &desc);
1495 continue;
1496 }
1497 /* Skip over any trailing bytes on short reads */
1498 xs_tcp_read_discard(transport, &desc);
1499 } while (desc.count);
1500 trace_xs_tcp_data_recv(transport);
1501 dprintk("RPC: xs_tcp_data_recv done\n");
1502 return len - desc.count;
1503 }
1504
1505 static void xs_tcp_data_receive(struct sock_xprt *transport)
1506 {
1507 struct rpc_xprt *xprt = &transport->xprt;
1508 struct sock *sk;
1509 read_descriptor_t rd_desc = {
1510 .count = 2*1024*1024,
1511 .arg.data = xprt,
1512 };
1513 unsigned long total = 0;
1514 int read = 0;
1515
1516 mutex_lock(&transport->recv_mutex);
1517 sk = transport->inet;
1518 if (sk == NULL)
1519 goto out;
1520
1521 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1522 for (;;) {
1523 lock_sock(sk);
1524 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1525 if (read <= 0) {
1526 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1527 release_sock(sk);
1528 if (!test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1529 break;
1530 } else {
1531 release_sock(sk);
1532 total += read;
1533 }
1534 rd_desc.count = 65536;
1535 }
1536 out:
1537 mutex_unlock(&transport->recv_mutex);
1538 trace_xs_tcp_data_ready(xprt, read, total);
1539 }
1540
1541 static void xs_tcp_data_receive_workfn(struct work_struct *work)
1542 {
1543 struct sock_xprt *transport =
1544 container_of(work, struct sock_xprt, recv_worker);
1545 xs_tcp_data_receive(transport);
1546 }
1547
1548 /**
1549 * xs_tcp_state_change - callback to handle TCP socket state changes
1550 * @sk: socket whose state has changed
1551 *
1552 */
1553 static void xs_tcp_state_change(struct sock *sk)
1554 {
1555 struct rpc_xprt *xprt;
1556 struct sock_xprt *transport;
1557
1558 read_lock_bh(&sk->sk_callback_lock);
1559 if (!(xprt = xprt_from_sock(sk)))
1560 goto out;
1561 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1562 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1563 sk->sk_state, xprt_connected(xprt),
1564 sock_flag(sk, SOCK_DEAD),
1565 sock_flag(sk, SOCK_ZAPPED),
1566 sk->sk_shutdown);
1567
1568 transport = container_of(xprt, struct sock_xprt, xprt);
1569 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1570 switch (sk->sk_state) {
1571 case TCP_ESTABLISHED:
1572 spin_lock(&xprt->transport_lock);
1573 if (!xprt_test_and_set_connected(xprt)) {
1574
1575 /* Reset TCP record info */
1576 transport->tcp_offset = 0;
1577 transport->tcp_reclen = 0;
1578 transport->tcp_copied = 0;
1579 transport->tcp_flags =
1580 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1581 xprt->connect_cookie++;
1582 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1583 xprt_clear_connecting(xprt);
1584
1585 xprt_wake_pending_tasks(xprt, -EAGAIN);
1586 }
1587 spin_unlock(&xprt->transport_lock);
1588 break;
1589 case TCP_FIN_WAIT1:
1590 /* The client initiated a shutdown of the socket */
1591 xprt->connect_cookie++;
1592 xprt->reestablish_timeout = 0;
1593 set_bit(XPRT_CLOSING, &xprt->state);
1594 smp_mb__before_atomic();
1595 clear_bit(XPRT_CONNECTED, &xprt->state);
1596 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1597 smp_mb__after_atomic();
1598 break;
1599 case TCP_CLOSE_WAIT:
1600 /* The server initiated a shutdown of the socket */
1601 xprt->connect_cookie++;
1602 clear_bit(XPRT_CONNECTED, &xprt->state);
1603 xs_tcp_force_close(xprt);
1604 case TCP_CLOSING:
1605 /*
1606 * If the server closed down the connection, make sure that
1607 * we back off before reconnecting
1608 */
1609 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1610 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1611 break;
1612 case TCP_LAST_ACK:
1613 set_bit(XPRT_CLOSING, &xprt->state);
1614 smp_mb__before_atomic();
1615 clear_bit(XPRT_CONNECTED, &xprt->state);
1616 smp_mb__after_atomic();
1617 break;
1618 case TCP_CLOSE:
1619 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1620 &transport->sock_state))
1621 xprt_clear_connecting(xprt);
1622 xs_sock_mark_closed(xprt);
1623 }
1624 out:
1625 read_unlock_bh(&sk->sk_callback_lock);
1626 }
1627
1628 static void xs_write_space(struct sock *sk)
1629 {
1630 struct socket_wq *wq;
1631 struct rpc_xprt *xprt;
1632
1633 if (!sk->sk_socket)
1634 return;
1635 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1636
1637 if (unlikely(!(xprt = xprt_from_sock(sk))))
1638 return;
1639 rcu_read_lock();
1640 wq = rcu_dereference(sk->sk_wq);
1641 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1642 goto out;
1643
1644 xprt_write_space(xprt);
1645 out:
1646 rcu_read_unlock();
1647 }
1648
1649 /**
1650 * xs_udp_write_space - callback invoked when socket buffer space
1651 * becomes available
1652 * @sk: socket whose state has changed
1653 *
1654 * Called when more output buffer space is available for this socket.
1655 * We try not to wake our writers until they can make "significant"
1656 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1657 * with a bunch of small requests.
1658 */
1659 static void xs_udp_write_space(struct sock *sk)
1660 {
1661 read_lock_bh(&sk->sk_callback_lock);
1662
1663 /* from net/core/sock.c:sock_def_write_space */
1664 if (sock_writeable(sk))
1665 xs_write_space(sk);
1666
1667 read_unlock_bh(&sk->sk_callback_lock);
1668 }
1669
1670 /**
1671 * xs_tcp_write_space - callback invoked when socket buffer space
1672 * becomes available
1673 * @sk: socket whose state has changed
1674 *
1675 * Called when more output buffer space is available for this socket.
1676 * We try not to wake our writers until they can make "significant"
1677 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1678 * with a bunch of small requests.
1679 */
1680 static void xs_tcp_write_space(struct sock *sk)
1681 {
1682 read_lock_bh(&sk->sk_callback_lock);
1683
1684 /* from net/core/stream.c:sk_stream_write_space */
1685 if (sk_stream_is_writeable(sk))
1686 xs_write_space(sk);
1687
1688 read_unlock_bh(&sk->sk_callback_lock);
1689 }
1690
1691 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1692 {
1693 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1694 struct sock *sk = transport->inet;
1695
1696 if (transport->rcvsize) {
1697 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1698 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1699 }
1700 if (transport->sndsize) {
1701 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1702 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1703 sk->sk_write_space(sk);
1704 }
1705 }
1706
1707 /**
1708 * xs_udp_set_buffer_size - set send and receive limits
1709 * @xprt: generic transport
1710 * @sndsize: requested size of send buffer, in bytes
1711 * @rcvsize: requested size of receive buffer, in bytes
1712 *
1713 * Set socket send and receive buffer size limits.
1714 */
1715 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1716 {
1717 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1718
1719 transport->sndsize = 0;
1720 if (sndsize)
1721 transport->sndsize = sndsize + 1024;
1722 transport->rcvsize = 0;
1723 if (rcvsize)
1724 transport->rcvsize = rcvsize + 1024;
1725
1726 xs_udp_do_set_buffer_size(xprt);
1727 }
1728
1729 /**
1730 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1731 * @task: task that timed out
1732 *
1733 * Adjust the congestion window after a retransmit timeout has occurred.
1734 */
1735 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1736 {
1737 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1738 }
1739
1740 static unsigned short xs_get_random_port(void)
1741 {
1742 unsigned short range = xprt_max_resvport - xprt_min_resvport + 1;
1743 unsigned short rand = (unsigned short) prandom_u32() % range;
1744 return rand + xprt_min_resvport;
1745 }
1746
1747 /**
1748 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1749 * @sock: socket
1750 *
1751 * Note that this function has to be called on all sockets that share the
1752 * same port, and it must be called before binding.
1753 */
1754 static void xs_sock_set_reuseport(struct socket *sock)
1755 {
1756 int opt = 1;
1757
1758 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1759 (char *)&opt, sizeof(opt));
1760 }
1761
1762 static unsigned short xs_sock_getport(struct socket *sock)
1763 {
1764 struct sockaddr_storage buf;
1765 int buflen;
1766 unsigned short port = 0;
1767
1768 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
1769 goto out;
1770 switch (buf.ss_family) {
1771 case AF_INET6:
1772 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1773 break;
1774 case AF_INET:
1775 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1776 }
1777 out:
1778 return port;
1779 }
1780
1781 /**
1782 * xs_set_port - reset the port number in the remote endpoint address
1783 * @xprt: generic transport
1784 * @port: new port number
1785 *
1786 */
1787 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1788 {
1789 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1790
1791 rpc_set_port(xs_addr(xprt), port);
1792 xs_update_peer_port(xprt);
1793 }
1794
1795 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1796 {
1797 if (transport->srcport == 0)
1798 transport->srcport = xs_sock_getport(sock);
1799 }
1800
1801 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1802 {
1803 unsigned short port = transport->srcport;
1804
1805 if (port == 0 && transport->xprt.resvport)
1806 port = xs_get_random_port();
1807 return port;
1808 }
1809
1810 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1811 {
1812 if (transport->srcport != 0)
1813 transport->srcport = 0;
1814 if (!transport->xprt.resvport)
1815 return 0;
1816 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1817 return xprt_max_resvport;
1818 return --port;
1819 }
1820 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1821 {
1822 struct sockaddr_storage myaddr;
1823 int err, nloop = 0;
1824 unsigned short port = xs_get_srcport(transport);
1825 unsigned short last;
1826
1827 /*
1828 * If we are asking for any ephemeral port (i.e. port == 0 &&
1829 * transport->xprt.resvport == 0), don't bind. Let the local
1830 * port selection happen implicitly when the socket is used
1831 * (for example at connect time).
1832 *
1833 * This ensures that we can continue to establish TCP
1834 * connections even when all local ephemeral ports are already
1835 * a part of some TCP connection. This makes no difference
1836 * for UDP sockets, but also doens't harm them.
1837 *
1838 * If we're asking for any reserved port (i.e. port == 0 &&
1839 * transport->xprt.resvport == 1) xs_get_srcport above will
1840 * ensure that port is non-zero and we will bind as needed.
1841 */
1842 if (port == 0)
1843 return 0;
1844
1845 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1846 do {
1847 rpc_set_port((struct sockaddr *)&myaddr, port);
1848 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1849 transport->xprt.addrlen);
1850 if (err == 0) {
1851 transport->srcport = port;
1852 break;
1853 }
1854 last = port;
1855 port = xs_next_srcport(transport, port);
1856 if (port > last)
1857 nloop++;
1858 } while (err == -EADDRINUSE && nloop != 2);
1859
1860 if (myaddr.ss_family == AF_INET)
1861 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1862 &((struct sockaddr_in *)&myaddr)->sin_addr,
1863 port, err ? "failed" : "ok", err);
1864 else
1865 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1866 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1867 port, err ? "failed" : "ok", err);
1868 return err;
1869 }
1870
1871 /*
1872 * We don't support autobind on AF_LOCAL sockets
1873 */
1874 static void xs_local_rpcbind(struct rpc_task *task)
1875 {
1876 xprt_set_bound(task->tk_xprt);
1877 }
1878
1879 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1880 {
1881 }
1882
1883 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1884 static struct lock_class_key xs_key[2];
1885 static struct lock_class_key xs_slock_key[2];
1886
1887 static inline void xs_reclassify_socketu(struct socket *sock)
1888 {
1889 struct sock *sk = sock->sk;
1890
1891 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1892 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1893 }
1894
1895 static inline void xs_reclassify_socket4(struct socket *sock)
1896 {
1897 struct sock *sk = sock->sk;
1898
1899 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1900 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1901 }
1902
1903 static inline void xs_reclassify_socket6(struct socket *sock)
1904 {
1905 struct sock *sk = sock->sk;
1906
1907 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1908 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1909 }
1910
1911 static inline void xs_reclassify_socket(int family, struct socket *sock)
1912 {
1913 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1914 return;
1915
1916 switch (family) {
1917 case AF_LOCAL:
1918 xs_reclassify_socketu(sock);
1919 break;
1920 case AF_INET:
1921 xs_reclassify_socket4(sock);
1922 break;
1923 case AF_INET6:
1924 xs_reclassify_socket6(sock);
1925 break;
1926 }
1927 }
1928 #else
1929 static inline void xs_reclassify_socket(int family, struct socket *sock)
1930 {
1931 }
1932 #endif
1933
1934 static void xs_dummy_setup_socket(struct work_struct *work)
1935 {
1936 }
1937
1938 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1939 struct sock_xprt *transport, int family, int type,
1940 int protocol, bool reuseport)
1941 {
1942 struct socket *sock;
1943 int err;
1944
1945 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1946 if (err < 0) {
1947 dprintk("RPC: can't create %d transport socket (%d).\n",
1948 protocol, -err);
1949 goto out;
1950 }
1951 xs_reclassify_socket(family, sock);
1952
1953 if (reuseport)
1954 xs_sock_set_reuseport(sock);
1955
1956 err = xs_bind(transport, sock);
1957 if (err) {
1958 sock_release(sock);
1959 goto out;
1960 }
1961
1962 return sock;
1963 out:
1964 return ERR_PTR(err);
1965 }
1966
1967 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1968 struct socket *sock)
1969 {
1970 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1971 xprt);
1972
1973 if (!transport->inet) {
1974 struct sock *sk = sock->sk;
1975
1976 write_lock_bh(&sk->sk_callback_lock);
1977
1978 xs_save_old_callbacks(transport, sk);
1979
1980 sk->sk_user_data = xprt;
1981 sk->sk_data_ready = xs_data_ready;
1982 sk->sk_write_space = xs_udp_write_space;
1983 sock_set_flag(sk, SOCK_FASYNC);
1984 sk->sk_error_report = xs_error_report;
1985 sk->sk_allocation = GFP_NOIO;
1986
1987 xprt_clear_connected(xprt);
1988
1989 /* Reset to new socket */
1990 transport->sock = sock;
1991 transport->inet = sk;
1992
1993 write_unlock_bh(&sk->sk_callback_lock);
1994 }
1995
1996 /* Tell the socket layer to start connecting... */
1997 xprt->stat.connect_count++;
1998 xprt->stat.connect_start = jiffies;
1999 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
2000 }
2001
2002 /**
2003 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
2004 * @transport: socket transport to connect
2005 */
2006 static int xs_local_setup_socket(struct sock_xprt *transport)
2007 {
2008 struct rpc_xprt *xprt = &transport->xprt;
2009 struct socket *sock;
2010 int status = -EIO;
2011
2012 status = __sock_create(xprt->xprt_net, AF_LOCAL,
2013 SOCK_STREAM, 0, &sock, 1);
2014 if (status < 0) {
2015 dprintk("RPC: can't create AF_LOCAL "
2016 "transport socket (%d).\n", -status);
2017 goto out;
2018 }
2019 xs_reclassify_socket(AF_LOCAL, sock);
2020
2021 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2022 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2023
2024 status = xs_local_finish_connecting(xprt, sock);
2025 trace_rpc_socket_connect(xprt, sock, status);
2026 switch (status) {
2027 case 0:
2028 dprintk("RPC: xprt %p connected to %s\n",
2029 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2030 xprt_set_connected(xprt);
2031 case -ENOBUFS:
2032 break;
2033 case -ENOENT:
2034 dprintk("RPC: xprt %p: socket %s does not exist\n",
2035 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2036 break;
2037 case -ECONNREFUSED:
2038 dprintk("RPC: xprt %p: connection refused for %s\n",
2039 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2040 break;
2041 default:
2042 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2043 __func__, -status,
2044 xprt->address_strings[RPC_DISPLAY_ADDR]);
2045 }
2046
2047 out:
2048 xprt_clear_connecting(xprt);
2049 xprt_wake_pending_tasks(xprt, status);
2050 return status;
2051 }
2052
2053 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2054 {
2055 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2056 int ret;
2057
2058 if (RPC_IS_ASYNC(task)) {
2059 /*
2060 * We want the AF_LOCAL connect to be resolved in the
2061 * filesystem namespace of the process making the rpc
2062 * call. Thus we connect synchronously.
2063 *
2064 * If we want to support asynchronous AF_LOCAL calls,
2065 * we'll need to figure out how to pass a namespace to
2066 * connect.
2067 */
2068 rpc_exit(task, -ENOTCONN);
2069 return;
2070 }
2071 ret = xs_local_setup_socket(transport);
2072 if (ret && !RPC_IS_SOFTCONN(task))
2073 msleep_interruptible(15000);
2074 }
2075
2076 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2077 /*
2078 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
2079 * know that we have exclusive access to the socket), to guard against
2080 * races with xs_reset_transport.
2081 */
2082 static void xs_set_memalloc(struct rpc_xprt *xprt)
2083 {
2084 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2085 xprt);
2086
2087 /*
2088 * If there's no sock, then we have nothing to set. The
2089 * reconnecting process will get it for us.
2090 */
2091 if (!transport->inet)
2092 return;
2093 if (atomic_read(&xprt->swapper))
2094 sk_set_memalloc(transport->inet);
2095 }
2096
2097 /**
2098 * xs_enable_swap - Tag this transport as being used for swap.
2099 * @xprt: transport to tag
2100 *
2101 * Take a reference to this transport on behalf of the rpc_clnt, and
2102 * optionally mark it for swapping if it wasn't already.
2103 */
2104 static int
2105 xs_enable_swap(struct rpc_xprt *xprt)
2106 {
2107 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2108
2109 if (atomic_inc_return(&xprt->swapper) != 1)
2110 return 0;
2111 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2112 return -ERESTARTSYS;
2113 if (xs->inet)
2114 sk_set_memalloc(xs->inet);
2115 xprt_release_xprt(xprt, NULL);
2116 return 0;
2117 }
2118
2119 /**
2120 * xs_disable_swap - Untag this transport as being used for swap.
2121 * @xprt: transport to tag
2122 *
2123 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2124 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2125 */
2126 static void
2127 xs_disable_swap(struct rpc_xprt *xprt)
2128 {
2129 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2130
2131 if (!atomic_dec_and_test(&xprt->swapper))
2132 return;
2133 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2134 return;
2135 if (xs->inet)
2136 sk_clear_memalloc(xs->inet);
2137 xprt_release_xprt(xprt, NULL);
2138 }
2139 #else
2140 static void xs_set_memalloc(struct rpc_xprt *xprt)
2141 {
2142 }
2143
2144 static int
2145 xs_enable_swap(struct rpc_xprt *xprt)
2146 {
2147 return -EINVAL;
2148 }
2149
2150 static void
2151 xs_disable_swap(struct rpc_xprt *xprt)
2152 {
2153 }
2154 #endif
2155
2156 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2157 {
2158 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2159
2160 if (!transport->inet) {
2161 struct sock *sk = sock->sk;
2162
2163 write_lock_bh(&sk->sk_callback_lock);
2164
2165 xs_save_old_callbacks(transport, sk);
2166
2167 sk->sk_user_data = xprt;
2168 sk->sk_data_ready = xs_data_ready;
2169 sk->sk_write_space = xs_udp_write_space;
2170 sock_set_flag(sk, SOCK_FASYNC);
2171 sk->sk_allocation = GFP_NOIO;
2172
2173 xprt_set_connected(xprt);
2174
2175 /* Reset to new socket */
2176 transport->sock = sock;
2177 transport->inet = sk;
2178
2179 xs_set_memalloc(xprt);
2180
2181 write_unlock_bh(&sk->sk_callback_lock);
2182 }
2183 xs_udp_do_set_buffer_size(xprt);
2184
2185 xprt->stat.connect_start = jiffies;
2186 }
2187
2188 static void xs_udp_setup_socket(struct work_struct *work)
2189 {
2190 struct sock_xprt *transport =
2191 container_of(work, struct sock_xprt, connect_worker.work);
2192 struct rpc_xprt *xprt = &transport->xprt;
2193 struct socket *sock = transport->sock;
2194 int status = -EIO;
2195
2196 sock = xs_create_sock(xprt, transport,
2197 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2198 IPPROTO_UDP, false);
2199 if (IS_ERR(sock))
2200 goto out;
2201
2202 dprintk("RPC: worker connecting xprt %p via %s to "
2203 "%s (port %s)\n", xprt,
2204 xprt->address_strings[RPC_DISPLAY_PROTO],
2205 xprt->address_strings[RPC_DISPLAY_ADDR],
2206 xprt->address_strings[RPC_DISPLAY_PORT]);
2207
2208 xs_udp_finish_connecting(xprt, sock);
2209 trace_rpc_socket_connect(xprt, sock, 0);
2210 status = 0;
2211 out:
2212 xprt_unlock_connect(xprt, transport);
2213 xprt_clear_connecting(xprt);
2214 xprt_wake_pending_tasks(xprt, status);
2215 }
2216
2217 /**
2218 * xs_tcp_shutdown - gracefully shut down a TCP socket
2219 * @xprt: transport
2220 *
2221 * Initiates a graceful shutdown of the TCP socket by calling the
2222 * equivalent of shutdown(SHUT_RDWR);
2223 */
2224 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2225 {
2226 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2227 struct socket *sock = transport->sock;
2228
2229 if (sock == NULL)
2230 return;
2231 if (xprt_connected(xprt)) {
2232 kernel_sock_shutdown(sock, SHUT_RDWR);
2233 trace_rpc_socket_shutdown(xprt, sock);
2234 } else
2235 xs_reset_transport(transport);
2236 }
2237
2238 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2239 {
2240 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2241 int ret = -ENOTCONN;
2242
2243 if (!transport->inet) {
2244 struct sock *sk = sock->sk;
2245 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2246 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2247 unsigned int opt_on = 1;
2248 unsigned int timeo;
2249 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
2250
2251 /* TCP Keepalive options */
2252 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2253 (char *)&opt_on, sizeof(opt_on));
2254 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2255 (char *)&keepidle, sizeof(keepidle));
2256 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2257 (char *)&keepidle, sizeof(keepidle));
2258 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2259 (char *)&keepcnt, sizeof(keepcnt));
2260
2261 /* Avoid temporary address, they are bad for long-lived
2262 * connections such as NFS mounts.
2263 * RFC4941, section 3.6 suggests that:
2264 * Individual applications, which have specific
2265 * knowledge about the normal duration of connections,
2266 * MAY override this as appropriate.
2267 */
2268 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
2269 (char *)&addr_pref, sizeof(addr_pref));
2270
2271 /* TCP user timeout (see RFC5482) */
2272 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2273 (xprt->timeout->to_retries + 1);
2274 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2275 (char *)&timeo, sizeof(timeo));
2276
2277 write_lock_bh(&sk->sk_callback_lock);
2278
2279 xs_save_old_callbacks(transport, sk);
2280
2281 sk->sk_user_data = xprt;
2282 sk->sk_data_ready = xs_data_ready;
2283 sk->sk_state_change = xs_tcp_state_change;
2284 sk->sk_write_space = xs_tcp_write_space;
2285 sock_set_flag(sk, SOCK_FASYNC);
2286 sk->sk_error_report = xs_error_report;
2287 sk->sk_allocation = GFP_NOIO;
2288
2289 /* socket options */
2290 sock_reset_flag(sk, SOCK_LINGER);
2291 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2292
2293 xprt_clear_connected(xprt);
2294
2295 /* Reset to new socket */
2296 transport->sock = sock;
2297 transport->inet = sk;
2298
2299 write_unlock_bh(&sk->sk_callback_lock);
2300 }
2301
2302 if (!xprt_bound(xprt))
2303 goto out;
2304
2305 xs_set_memalloc(xprt);
2306
2307 /* Tell the socket layer to start connecting... */
2308 xprt->stat.connect_count++;
2309 xprt->stat.connect_start = jiffies;
2310 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2311 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2312 switch (ret) {
2313 case 0:
2314 xs_set_srcport(transport, sock);
2315 case -EINPROGRESS:
2316 /* SYN_SENT! */
2317 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2318 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2319 break;
2320 case -EADDRNOTAVAIL:
2321 /* Source port number is unavailable. Try a new one! */
2322 transport->srcport = 0;
2323 }
2324 out:
2325 return ret;
2326 }
2327
2328 /**
2329 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2330 *
2331 * Invoked by a work queue tasklet.
2332 */
2333 static void xs_tcp_setup_socket(struct work_struct *work)
2334 {
2335 struct sock_xprt *transport =
2336 container_of(work, struct sock_xprt, connect_worker.work);
2337 struct socket *sock = transport->sock;
2338 struct rpc_xprt *xprt = &transport->xprt;
2339 int status = -EIO;
2340
2341 if (!sock) {
2342 sock = xs_create_sock(xprt, transport,
2343 xs_addr(xprt)->sa_family, SOCK_STREAM,
2344 IPPROTO_TCP, true);
2345 if (IS_ERR(sock)) {
2346 status = PTR_ERR(sock);
2347 goto out;
2348 }
2349 }
2350
2351 dprintk("RPC: worker connecting xprt %p via %s to "
2352 "%s (port %s)\n", xprt,
2353 xprt->address_strings[RPC_DISPLAY_PROTO],
2354 xprt->address_strings[RPC_DISPLAY_ADDR],
2355 xprt->address_strings[RPC_DISPLAY_PORT]);
2356
2357 status = xs_tcp_finish_connecting(xprt, sock);
2358 trace_rpc_socket_connect(xprt, sock, status);
2359 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2360 xprt, -status, xprt_connected(xprt),
2361 sock->sk->sk_state);
2362 switch (status) {
2363 default:
2364 printk("%s: connect returned unhandled error %d\n",
2365 __func__, status);
2366 case -EADDRNOTAVAIL:
2367 /* We're probably in TIME_WAIT. Get rid of existing socket,
2368 * and retry
2369 */
2370 xs_tcp_force_close(xprt);
2371 break;
2372 case 0:
2373 case -EINPROGRESS:
2374 case -EALREADY:
2375 xprt_unlock_connect(xprt, transport);
2376 return;
2377 case -EINVAL:
2378 /* Happens, for instance, if the user specified a link
2379 * local IPv6 address without a scope-id.
2380 */
2381 case -ECONNREFUSED:
2382 case -ECONNRESET:
2383 case -ENETUNREACH:
2384 case -EADDRINUSE:
2385 case -ENOBUFS:
2386 /* retry with existing socket, after a delay */
2387 xs_tcp_force_close(xprt);
2388 goto out;
2389 }
2390 status = -EAGAIN;
2391 out:
2392 xprt_unlock_connect(xprt, transport);
2393 xprt_clear_connecting(xprt);
2394 xprt_wake_pending_tasks(xprt, status);
2395 }
2396
2397 static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
2398 {
2399 unsigned long start, now = jiffies;
2400
2401 start = xprt->stat.connect_start + xprt->reestablish_timeout;
2402 if (time_after(start, now))
2403 return start - now;
2404 return 0;
2405 }
2406
2407 static void xs_reconnect_backoff(struct rpc_xprt *xprt)
2408 {
2409 xprt->reestablish_timeout <<= 1;
2410 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
2411 xprt->reestablish_timeout = xprt->max_reconnect_timeout;
2412 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2413 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2414 }
2415
2416 /**
2417 * xs_connect - connect a socket to a remote endpoint
2418 * @xprt: pointer to transport structure
2419 * @task: address of RPC task that manages state of connect request
2420 *
2421 * TCP: If the remote end dropped the connection, delay reconnecting.
2422 *
2423 * UDP socket connects are synchronous, but we use a work queue anyway
2424 * to guarantee that even unprivileged user processes can set up a
2425 * socket on a privileged port.
2426 *
2427 * If a UDP socket connect fails, the delay behavior here prevents
2428 * retry floods (hard mounts).
2429 */
2430 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2431 {
2432 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2433 unsigned long delay = 0;
2434
2435 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2436
2437 if (transport->sock != NULL) {
2438 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2439 "seconds\n",
2440 xprt, xprt->reestablish_timeout / HZ);
2441
2442 /* Start by resetting any existing state */
2443 xs_reset_transport(transport);
2444
2445 delay = xs_reconnect_delay(xprt);
2446 xs_reconnect_backoff(xprt);
2447
2448 } else
2449 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2450
2451 queue_delayed_work(xprtiod_workqueue,
2452 &transport->connect_worker,
2453 delay);
2454 }
2455
2456 /**
2457 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2458 * @xprt: rpc_xprt struct containing statistics
2459 * @seq: output file
2460 *
2461 */
2462 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2463 {
2464 long idle_time = 0;
2465
2466 if (xprt_connected(xprt))
2467 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2468
2469 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2470 "%llu %llu %lu %llu %llu\n",
2471 xprt->stat.bind_count,
2472 xprt->stat.connect_count,
2473 xprt->stat.connect_time,
2474 idle_time,
2475 xprt->stat.sends,
2476 xprt->stat.recvs,
2477 xprt->stat.bad_xids,
2478 xprt->stat.req_u,
2479 xprt->stat.bklog_u,
2480 xprt->stat.max_slots,
2481 xprt->stat.sending_u,
2482 xprt->stat.pending_u);
2483 }
2484
2485 /**
2486 * xs_udp_print_stats - display UDP socket-specifc stats
2487 * @xprt: rpc_xprt struct containing statistics
2488 * @seq: output file
2489 *
2490 */
2491 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2492 {
2493 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2494
2495 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2496 "%lu %llu %llu\n",
2497 transport->srcport,
2498 xprt->stat.bind_count,
2499 xprt->stat.sends,
2500 xprt->stat.recvs,
2501 xprt->stat.bad_xids,
2502 xprt->stat.req_u,
2503 xprt->stat.bklog_u,
2504 xprt->stat.max_slots,
2505 xprt->stat.sending_u,
2506 xprt->stat.pending_u);
2507 }
2508
2509 /**
2510 * xs_tcp_print_stats - display TCP socket-specifc stats
2511 * @xprt: rpc_xprt struct containing statistics
2512 * @seq: output file
2513 *
2514 */
2515 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2516 {
2517 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2518 long idle_time = 0;
2519
2520 if (xprt_connected(xprt))
2521 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2522
2523 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2524 "%llu %llu %lu %llu %llu\n",
2525 transport->srcport,
2526 xprt->stat.bind_count,
2527 xprt->stat.connect_count,
2528 xprt->stat.connect_time,
2529 idle_time,
2530 xprt->stat.sends,
2531 xprt->stat.recvs,
2532 xprt->stat.bad_xids,
2533 xprt->stat.req_u,
2534 xprt->stat.bklog_u,
2535 xprt->stat.max_slots,
2536 xprt->stat.sending_u,
2537 xprt->stat.pending_u);
2538 }
2539
2540 /*
2541 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2542 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2543 * to use the server side send routines.
2544 */
2545 static int bc_malloc(struct rpc_task *task)
2546 {
2547 struct rpc_rqst *rqst = task->tk_rqstp;
2548 size_t size = rqst->rq_callsize;
2549 struct page *page;
2550 struct rpc_buffer *buf;
2551
2552 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2553 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2554 size);
2555 return -EINVAL;
2556 }
2557
2558 page = alloc_page(GFP_KERNEL);
2559 if (!page)
2560 return -ENOMEM;
2561
2562 buf = page_address(page);
2563 buf->len = PAGE_SIZE;
2564
2565 rqst->rq_buffer = buf->data;
2566 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2567 return 0;
2568 }
2569
2570 /*
2571 * Free the space allocated in the bc_alloc routine
2572 */
2573 static void bc_free(struct rpc_task *task)
2574 {
2575 void *buffer = task->tk_rqstp->rq_buffer;
2576 struct rpc_buffer *buf;
2577
2578 buf = container_of(buffer, struct rpc_buffer, data);
2579 free_page((unsigned long)buf);
2580 }
2581
2582 /*
2583 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2584 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2585 */
2586 static int bc_sendto(struct rpc_rqst *req)
2587 {
2588 int len;
2589 struct xdr_buf *xbufp = &req->rq_snd_buf;
2590 struct rpc_xprt *xprt = req->rq_xprt;
2591 struct sock_xprt *transport =
2592 container_of(xprt, struct sock_xprt, xprt);
2593 struct socket *sock = transport->sock;
2594 unsigned long headoff;
2595 unsigned long tailoff;
2596
2597 xs_encode_stream_record_marker(xbufp);
2598
2599 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2600 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2601 len = svc_send_common(sock, xbufp,
2602 virt_to_page(xbufp->head[0].iov_base), headoff,
2603 xbufp->tail[0].iov_base, tailoff);
2604
2605 if (len != xbufp->len) {
2606 printk(KERN_NOTICE "Error sending entire callback!\n");
2607 len = -EAGAIN;
2608 }
2609
2610 return len;
2611 }
2612
2613 /*
2614 * The send routine. Borrows from svc_send
2615 */
2616 static int bc_send_request(struct rpc_task *task)
2617 {
2618 struct rpc_rqst *req = task->tk_rqstp;
2619 struct svc_xprt *xprt;
2620 int len;
2621
2622 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2623 /*
2624 * Get the server socket associated with this callback xprt
2625 */
2626 xprt = req->rq_xprt->bc_xprt;
2627
2628 /*
2629 * Grab the mutex to serialize data as the connection is shared
2630 * with the fore channel
2631 */
2632 if (!mutex_trylock(&xprt->xpt_mutex)) {
2633 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2634 if (!mutex_trylock(&xprt->xpt_mutex))
2635 return -EAGAIN;
2636 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2637 }
2638 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2639 len = -ENOTCONN;
2640 else
2641 len = bc_sendto(req);
2642 mutex_unlock(&xprt->xpt_mutex);
2643
2644 if (len > 0)
2645 len = 0;
2646
2647 return len;
2648 }
2649
2650 /*
2651 * The close routine. Since this is client initiated, we do nothing
2652 */
2653
2654 static void bc_close(struct rpc_xprt *xprt)
2655 {
2656 }
2657
2658 /*
2659 * The xprt destroy routine. Again, because this connection is client
2660 * initiated, we do nothing
2661 */
2662
2663 static void bc_destroy(struct rpc_xprt *xprt)
2664 {
2665 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2666
2667 xs_xprt_free(xprt);
2668 module_put(THIS_MODULE);
2669 }
2670
2671 static struct rpc_xprt_ops xs_local_ops = {
2672 .reserve_xprt = xprt_reserve_xprt,
2673 .release_xprt = xs_tcp_release_xprt,
2674 .alloc_slot = xprt_alloc_slot,
2675 .rpcbind = xs_local_rpcbind,
2676 .set_port = xs_local_set_port,
2677 .connect = xs_local_connect,
2678 .buf_alloc = rpc_malloc,
2679 .buf_free = rpc_free,
2680 .send_request = xs_local_send_request,
2681 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2682 .close = xs_close,
2683 .destroy = xs_destroy,
2684 .print_stats = xs_local_print_stats,
2685 .enable_swap = xs_enable_swap,
2686 .disable_swap = xs_disable_swap,
2687 };
2688
2689 static struct rpc_xprt_ops xs_udp_ops = {
2690 .set_buffer_size = xs_udp_set_buffer_size,
2691 .reserve_xprt = xprt_reserve_xprt_cong,
2692 .release_xprt = xprt_release_xprt_cong,
2693 .alloc_slot = xprt_alloc_slot,
2694 .rpcbind = rpcb_getport_async,
2695 .set_port = xs_set_port,
2696 .connect = xs_connect,
2697 .buf_alloc = rpc_malloc,
2698 .buf_free = rpc_free,
2699 .send_request = xs_udp_send_request,
2700 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2701 .timer = xs_udp_timer,
2702 .release_request = xprt_release_rqst_cong,
2703 .close = xs_close,
2704 .destroy = xs_destroy,
2705 .print_stats = xs_udp_print_stats,
2706 .enable_swap = xs_enable_swap,
2707 .disable_swap = xs_disable_swap,
2708 .inject_disconnect = xs_inject_disconnect,
2709 };
2710
2711 static struct rpc_xprt_ops xs_tcp_ops = {
2712 .reserve_xprt = xprt_reserve_xprt,
2713 .release_xprt = xs_tcp_release_xprt,
2714 .alloc_slot = xprt_lock_and_alloc_slot,
2715 .rpcbind = rpcb_getport_async,
2716 .set_port = xs_set_port,
2717 .connect = xs_connect,
2718 .buf_alloc = rpc_malloc,
2719 .buf_free = rpc_free,
2720 .send_request = xs_tcp_send_request,
2721 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2722 .close = xs_tcp_shutdown,
2723 .destroy = xs_destroy,
2724 .print_stats = xs_tcp_print_stats,
2725 .enable_swap = xs_enable_swap,
2726 .disable_swap = xs_disable_swap,
2727 .inject_disconnect = xs_inject_disconnect,
2728 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2729 .bc_setup = xprt_setup_bc,
2730 .bc_up = xs_tcp_bc_up,
2731 .bc_maxpayload = xs_tcp_bc_maxpayload,
2732 .bc_free_rqst = xprt_free_bc_rqst,
2733 .bc_destroy = xprt_destroy_bc,
2734 #endif
2735 };
2736
2737 /*
2738 * The rpc_xprt_ops for the server backchannel
2739 */
2740
2741 static struct rpc_xprt_ops bc_tcp_ops = {
2742 .reserve_xprt = xprt_reserve_xprt,
2743 .release_xprt = xprt_release_xprt,
2744 .alloc_slot = xprt_alloc_slot,
2745 .buf_alloc = bc_malloc,
2746 .buf_free = bc_free,
2747 .send_request = bc_send_request,
2748 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2749 .close = bc_close,
2750 .destroy = bc_destroy,
2751 .print_stats = xs_tcp_print_stats,
2752 .enable_swap = xs_enable_swap,
2753 .disable_swap = xs_disable_swap,
2754 .inject_disconnect = xs_inject_disconnect,
2755 };
2756
2757 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2758 {
2759 static const struct sockaddr_in sin = {
2760 .sin_family = AF_INET,
2761 .sin_addr.s_addr = htonl(INADDR_ANY),
2762 };
2763 static const struct sockaddr_in6 sin6 = {
2764 .sin6_family = AF_INET6,
2765 .sin6_addr = IN6ADDR_ANY_INIT,
2766 };
2767
2768 switch (family) {
2769 case AF_LOCAL:
2770 break;
2771 case AF_INET:
2772 memcpy(sap, &sin, sizeof(sin));
2773 break;
2774 case AF_INET6:
2775 memcpy(sap, &sin6, sizeof(sin6));
2776 break;
2777 default:
2778 dprintk("RPC: %s: Bad address family\n", __func__);
2779 return -EAFNOSUPPORT;
2780 }
2781 return 0;
2782 }
2783
2784 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2785 unsigned int slot_table_size,
2786 unsigned int max_slot_table_size)
2787 {
2788 struct rpc_xprt *xprt;
2789 struct sock_xprt *new;
2790
2791 if (args->addrlen > sizeof(xprt->addr)) {
2792 dprintk("RPC: xs_setup_xprt: address too large\n");
2793 return ERR_PTR(-EBADF);
2794 }
2795
2796 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2797 max_slot_table_size);
2798 if (xprt == NULL) {
2799 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2800 "rpc_xprt\n");
2801 return ERR_PTR(-ENOMEM);
2802 }
2803
2804 new = container_of(xprt, struct sock_xprt, xprt);
2805 mutex_init(&new->recv_mutex);
2806 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2807 xprt->addrlen = args->addrlen;
2808 if (args->srcaddr)
2809 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2810 else {
2811 int err;
2812 err = xs_init_anyaddr(args->dstaddr->sa_family,
2813 (struct sockaddr *)&new->srcaddr);
2814 if (err != 0) {
2815 xprt_free(xprt);
2816 return ERR_PTR(err);
2817 }
2818 }
2819
2820 return xprt;
2821 }
2822
2823 static const struct rpc_timeout xs_local_default_timeout = {
2824 .to_initval = 10 * HZ,
2825 .to_maxval = 10 * HZ,
2826 .to_retries = 2,
2827 };
2828
2829 /**
2830 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2831 * @args: rpc transport creation arguments
2832 *
2833 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2834 */
2835 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2836 {
2837 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2838 struct sock_xprt *transport;
2839 struct rpc_xprt *xprt;
2840 struct rpc_xprt *ret;
2841
2842 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2843 xprt_max_tcp_slot_table_entries);
2844 if (IS_ERR(xprt))
2845 return xprt;
2846 transport = container_of(xprt, struct sock_xprt, xprt);
2847
2848 xprt->prot = 0;
2849 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2850 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2851
2852 xprt->bind_timeout = XS_BIND_TO;
2853 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2854 xprt->idle_timeout = XS_IDLE_DISC_TO;
2855
2856 xprt->ops = &xs_local_ops;
2857 xprt->timeout = &xs_local_default_timeout;
2858
2859 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
2860 INIT_DELAYED_WORK(&transport->connect_worker,
2861 xs_dummy_setup_socket);
2862
2863 switch (sun->sun_family) {
2864 case AF_LOCAL:
2865 if (sun->sun_path[0] != '/') {
2866 dprintk("RPC: bad AF_LOCAL address: %s\n",
2867 sun->sun_path);
2868 ret = ERR_PTR(-EINVAL);
2869 goto out_err;
2870 }
2871 xprt_set_bound(xprt);
2872 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2873 ret = ERR_PTR(xs_local_setup_socket(transport));
2874 if (ret)
2875 goto out_err;
2876 break;
2877 default:
2878 ret = ERR_PTR(-EAFNOSUPPORT);
2879 goto out_err;
2880 }
2881
2882 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2883 xprt->address_strings[RPC_DISPLAY_ADDR]);
2884
2885 if (try_module_get(THIS_MODULE))
2886 return xprt;
2887 ret = ERR_PTR(-EINVAL);
2888 out_err:
2889 xs_xprt_free(xprt);
2890 return ret;
2891 }
2892
2893 static const struct rpc_timeout xs_udp_default_timeout = {
2894 .to_initval = 5 * HZ,
2895 .to_maxval = 30 * HZ,
2896 .to_increment = 5 * HZ,
2897 .to_retries = 5,
2898 };
2899
2900 /**
2901 * xs_setup_udp - Set up transport to use a UDP socket
2902 * @args: rpc transport creation arguments
2903 *
2904 */
2905 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2906 {
2907 struct sockaddr *addr = args->dstaddr;
2908 struct rpc_xprt *xprt;
2909 struct sock_xprt *transport;
2910 struct rpc_xprt *ret;
2911
2912 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2913 xprt_udp_slot_table_entries);
2914 if (IS_ERR(xprt))
2915 return xprt;
2916 transport = container_of(xprt, struct sock_xprt, xprt);
2917
2918 xprt->prot = IPPROTO_UDP;
2919 xprt->tsh_size = 0;
2920 /* XXX: header size can vary due to auth type, IPv6, etc. */
2921 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2922
2923 xprt->bind_timeout = XS_BIND_TO;
2924 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2925 xprt->idle_timeout = XS_IDLE_DISC_TO;
2926
2927 xprt->ops = &xs_udp_ops;
2928
2929 xprt->timeout = &xs_udp_default_timeout;
2930
2931 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2932 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2933
2934 switch (addr->sa_family) {
2935 case AF_INET:
2936 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2937 xprt_set_bound(xprt);
2938
2939 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2940 break;
2941 case AF_INET6:
2942 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2943 xprt_set_bound(xprt);
2944
2945 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2946 break;
2947 default:
2948 ret = ERR_PTR(-EAFNOSUPPORT);
2949 goto out_err;
2950 }
2951
2952 if (xprt_bound(xprt))
2953 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2954 xprt->address_strings[RPC_DISPLAY_ADDR],
2955 xprt->address_strings[RPC_DISPLAY_PORT],
2956 xprt->address_strings[RPC_DISPLAY_PROTO]);
2957 else
2958 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2959 xprt->address_strings[RPC_DISPLAY_ADDR],
2960 xprt->address_strings[RPC_DISPLAY_PROTO]);
2961
2962 if (try_module_get(THIS_MODULE))
2963 return xprt;
2964 ret = ERR_PTR(-EINVAL);
2965 out_err:
2966 xs_xprt_free(xprt);
2967 return ret;
2968 }
2969
2970 static const struct rpc_timeout xs_tcp_default_timeout = {
2971 .to_initval = 60 * HZ,
2972 .to_maxval = 60 * HZ,
2973 .to_retries = 2,
2974 };
2975
2976 /**
2977 * xs_setup_tcp - Set up transport to use a TCP socket
2978 * @args: rpc transport creation arguments
2979 *
2980 */
2981 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2982 {
2983 struct sockaddr *addr = args->dstaddr;
2984 struct rpc_xprt *xprt;
2985 struct sock_xprt *transport;
2986 struct rpc_xprt *ret;
2987 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2988
2989 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2990 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2991
2992 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2993 max_slot_table_size);
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
3002 xprt->bind_timeout = XS_BIND_TO;
3003 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3004 xprt->idle_timeout = XS_IDLE_DISC_TO;
3005
3006 xprt->ops = &xs_tcp_ops;
3007 xprt->timeout = &xs_tcp_default_timeout;
3008
3009 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3010
3011 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
3012 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3013
3014 switch (addr->sa_family) {
3015 case AF_INET:
3016 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3017 xprt_set_bound(xprt);
3018
3019 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3020 break;
3021 case AF_INET6:
3022 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3023 xprt_set_bound(xprt);
3024
3025 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3026 break;
3027 default:
3028 ret = ERR_PTR(-EAFNOSUPPORT);
3029 goto out_err;
3030 }
3031
3032 if (xprt_bound(xprt))
3033 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3034 xprt->address_strings[RPC_DISPLAY_ADDR],
3035 xprt->address_strings[RPC_DISPLAY_PORT],
3036 xprt->address_strings[RPC_DISPLAY_PROTO]);
3037 else
3038 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3039 xprt->address_strings[RPC_DISPLAY_ADDR],
3040 xprt->address_strings[RPC_DISPLAY_PROTO]);
3041
3042 if (try_module_get(THIS_MODULE))
3043 return xprt;
3044 ret = ERR_PTR(-EINVAL);
3045 out_err:
3046 xs_xprt_free(xprt);
3047 return ret;
3048 }
3049
3050 /**
3051 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3052 * @args: rpc transport creation arguments
3053 *
3054 */
3055 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3056 {
3057 struct sockaddr *addr = args->dstaddr;
3058 struct rpc_xprt *xprt;
3059 struct sock_xprt *transport;
3060 struct svc_sock *bc_sock;
3061 struct rpc_xprt *ret;
3062
3063 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3064 xprt_tcp_slot_table_entries);
3065 if (IS_ERR(xprt))
3066 return xprt;
3067 transport = container_of(xprt, struct sock_xprt, xprt);
3068
3069 xprt->prot = IPPROTO_TCP;
3070 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3071 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3072 xprt->timeout = &xs_tcp_default_timeout;
3073
3074 /* backchannel */
3075 xprt_set_bound(xprt);
3076 xprt->bind_timeout = 0;
3077 xprt->reestablish_timeout = 0;
3078 xprt->idle_timeout = 0;
3079
3080 xprt->ops = &bc_tcp_ops;
3081
3082 switch (addr->sa_family) {
3083 case AF_INET:
3084 xs_format_peer_addresses(xprt, "tcp",
3085 RPCBIND_NETID_TCP);
3086 break;
3087 case AF_INET6:
3088 xs_format_peer_addresses(xprt, "tcp",
3089 RPCBIND_NETID_TCP6);
3090 break;
3091 default:
3092 ret = ERR_PTR(-EAFNOSUPPORT);
3093 goto out_err;
3094 }
3095
3096 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3097 xprt->address_strings[RPC_DISPLAY_ADDR],
3098 xprt->address_strings[RPC_DISPLAY_PORT],
3099 xprt->address_strings[RPC_DISPLAY_PROTO]);
3100
3101 /*
3102 * Once we've associated a backchannel xprt with a connection,
3103 * we want to keep it around as long as the connection lasts,
3104 * in case we need to start using it for a backchannel again;
3105 * this reference won't be dropped until bc_xprt is destroyed.
3106 */
3107 xprt_get(xprt);
3108 args->bc_xprt->xpt_bc_xprt = xprt;
3109 xprt->bc_xprt = args->bc_xprt;
3110 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3111 transport->sock = bc_sock->sk_sock;
3112 transport->inet = bc_sock->sk_sk;
3113
3114 /*
3115 * Since we don't want connections for the backchannel, we set
3116 * the xprt status to connected
3117 */
3118 xprt_set_connected(xprt);
3119
3120 if (try_module_get(THIS_MODULE))
3121 return xprt;
3122
3123 args->bc_xprt->xpt_bc_xprt = NULL;
3124 args->bc_xprt->xpt_bc_xps = NULL;
3125 xprt_put(xprt);
3126 ret = ERR_PTR(-EINVAL);
3127 out_err:
3128 xs_xprt_free(xprt);
3129 return ret;
3130 }
3131
3132 static struct xprt_class xs_local_transport = {
3133 .list = LIST_HEAD_INIT(xs_local_transport.list),
3134 .name = "named UNIX socket",
3135 .owner = THIS_MODULE,
3136 .ident = XPRT_TRANSPORT_LOCAL,
3137 .setup = xs_setup_local,
3138 };
3139
3140 static struct xprt_class xs_udp_transport = {
3141 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3142 .name = "udp",
3143 .owner = THIS_MODULE,
3144 .ident = XPRT_TRANSPORT_UDP,
3145 .setup = xs_setup_udp,
3146 };
3147
3148 static struct xprt_class xs_tcp_transport = {
3149 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3150 .name = "tcp",
3151 .owner = THIS_MODULE,
3152 .ident = XPRT_TRANSPORT_TCP,
3153 .setup = xs_setup_tcp,
3154 };
3155
3156 static struct xprt_class xs_bc_tcp_transport = {
3157 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3158 .name = "tcp NFSv4.1 backchannel",
3159 .owner = THIS_MODULE,
3160 .ident = XPRT_TRANSPORT_BC_TCP,
3161 .setup = xs_setup_bc_tcp,
3162 };
3163
3164 /**
3165 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3166 *
3167 */
3168 int init_socket_xprt(void)
3169 {
3170 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3171 if (!sunrpc_table_header)
3172 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3173 #endif
3174
3175 xprt_register_transport(&xs_local_transport);
3176 xprt_register_transport(&xs_udp_transport);
3177 xprt_register_transport(&xs_tcp_transport);
3178 xprt_register_transport(&xs_bc_tcp_transport);
3179
3180 return 0;
3181 }
3182
3183 /**
3184 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3185 *
3186 */
3187 void cleanup_socket_xprt(void)
3188 {
3189 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3190 if (sunrpc_table_header) {
3191 unregister_sysctl_table(sunrpc_table_header);
3192 sunrpc_table_header = NULL;
3193 }
3194 #endif
3195
3196 xprt_unregister_transport(&xs_local_transport);
3197 xprt_unregister_transport(&xs_udp_transport);
3198 xprt_unregister_transport(&xs_tcp_transport);
3199 xprt_unregister_transport(&xs_bc_tcp_transport);
3200 }
3201
3202 static int param_set_uint_minmax(const char *val,
3203 const struct kernel_param *kp,
3204 unsigned int min, unsigned int max)
3205 {
3206 unsigned int num;
3207 int ret;
3208
3209 if (!val)
3210 return -EINVAL;
3211 ret = kstrtouint(val, 0, &num);
3212 if (ret == -EINVAL || num < min || num > max)
3213 return -EINVAL;
3214 *((unsigned int *)kp->arg) = num;
3215 return 0;
3216 }
3217
3218 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3219 {
3220 if (kp->arg == &xprt_min_resvport)
3221 return param_set_uint_minmax(val, kp,
3222 RPC_MIN_RESVPORT,
3223 xprt_max_resvport);
3224 return param_set_uint_minmax(val, kp,
3225 xprt_min_resvport,
3226 RPC_MAX_RESVPORT);
3227 }
3228
3229 static const struct kernel_param_ops param_ops_portnr = {
3230 .set = param_set_portnr,
3231 .get = param_get_uint,
3232 };
3233
3234 #define param_check_portnr(name, p) \
3235 __param_check(name, p, unsigned int);
3236
3237 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3238 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3239
3240 static int param_set_slot_table_size(const char *val,
3241 const struct kernel_param *kp)
3242 {
3243 return param_set_uint_minmax(val, kp,
3244 RPC_MIN_SLOT_TABLE,
3245 RPC_MAX_SLOT_TABLE);
3246 }
3247
3248 static const struct kernel_param_ops param_ops_slot_table_size = {
3249 .set = param_set_slot_table_size,
3250 .get = param_get_uint,
3251 };
3252
3253 #define param_check_slot_table_size(name, p) \
3254 __param_check(name, p, unsigned int);
3255
3256 static int param_set_max_slot_table_size(const char *val,
3257 const struct kernel_param *kp)
3258 {
3259 return param_set_uint_minmax(val, kp,
3260 RPC_MIN_SLOT_TABLE,
3261 RPC_MAX_SLOT_TABLE_LIMIT);
3262 }
3263
3264 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3265 .set = param_set_max_slot_table_size,
3266 .get = param_get_uint,
3267 };
3268
3269 #define param_check_max_slot_table_size(name, p) \
3270 __param_check(name, p, unsigned int);
3271
3272 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3273 slot_table_size, 0644);
3274 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3275 max_slot_table_size, 0644);
3276 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3277 slot_table_size, 0644);
3278