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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/slab.h> |
23 | #include <linux/module.h> |
24 | #include <linux/capability.h> |
25 | #include <linux/pagemap.h> |
26 | #include <linux/errno.h> |
27 | #include <linux/socket.h> |
28 | #include <linux/in.h> |
29 | #include <linux/net.h> |
30 | #include <linux/mm.h> |
31 | #include <linux/udp.h> |
32 | #include <linux/tcp.h> |
33 | #include <linux/sunrpc/clnt.h> |
34 | #include <linux/sunrpc/sched.h> |
35 | #include <linux/sunrpc/svcsock.h> |
36 | #include <linux/sunrpc/xprtsock.h> |
37 | #include <linux/file.h> |
38 | #ifdef CONFIG_NFS_V4_1 |
39 | #include <linux/sunrpc/bc_xprt.h> |
40 | #endif |
41 | |
42 | #include <net/sock.h> |
43 | #include <net/checksum.h> |
44 | #include <net/udp.h> |
45 | #include <net/tcp.h> |
46 | |
47 | #include "sunrpc.h" |
48 | /* |
49 | * xprtsock tunables |
50 | */ |
51 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
52 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
53 | |
54 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; |
55 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; |
56 | |
57 | #define XS_TCP_LINGER_TO (15U * HZ) |
58 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
59 | |
60 | /* |
61 | * We can register our own files under /proc/sys/sunrpc by |
62 | * calling register_sysctl_table() again. The files in that |
63 | * directory become the union of all files registered there. |
64 | * |
65 | * We simply need to make sure that we don't collide with |
66 | * someone else's file names! |
67 | */ |
68 | |
69 | #ifdef RPC_DEBUG |
70 | |
71 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; |
72 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; |
73 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; |
74 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; |
75 | |
76 | static struct ctl_table_header *sunrpc_table_header; |
77 | |
78 | /* |
79 | * FIXME: changing the UDP slot table size should also resize the UDP |
80 | * socket buffers for existing UDP transports |
81 | */ |
82 | static ctl_table xs_tunables_table[] = { |
83 | { |
84 | .procname = "udp_slot_table_entries", |
85 | .data = &xprt_udp_slot_table_entries, |
86 | .maxlen = sizeof(unsigned int), |
87 | .mode = 0644, |
88 | .proc_handler = proc_dointvec_minmax, |
89 | .extra1 = &min_slot_table_size, |
90 | .extra2 = &max_slot_table_size |
91 | }, |
92 | { |
93 | .procname = "tcp_slot_table_entries", |
94 | .data = &xprt_tcp_slot_table_entries, |
95 | .maxlen = sizeof(unsigned int), |
96 | .mode = 0644, |
97 | .proc_handler = proc_dointvec_minmax, |
98 | .extra1 = &min_slot_table_size, |
99 | .extra2 = &max_slot_table_size |
100 | }, |
101 | { |
102 | .procname = "min_resvport", |
103 | .data = &xprt_min_resvport, |
104 | .maxlen = sizeof(unsigned int), |
105 | .mode = 0644, |
106 | .proc_handler = proc_dointvec_minmax, |
107 | .extra1 = &xprt_min_resvport_limit, |
108 | .extra2 = &xprt_max_resvport_limit |
109 | }, |
110 | { |
111 | .procname = "max_resvport", |
112 | .data = &xprt_max_resvport, |
113 | .maxlen = sizeof(unsigned int), |
114 | .mode = 0644, |
115 | .proc_handler = proc_dointvec_minmax, |
116 | .extra1 = &xprt_min_resvport_limit, |
117 | .extra2 = &xprt_max_resvport_limit |
118 | }, |
119 | { |
120 | .procname = "tcp_fin_timeout", |
121 | .data = &xs_tcp_fin_timeout, |
122 | .maxlen = sizeof(xs_tcp_fin_timeout), |
123 | .mode = 0644, |
124 | .proc_handler = proc_dointvec_jiffies, |
125 | }, |
126 | { }, |
127 | }; |
128 | |
129 | static ctl_table sunrpc_table[] = { |
130 | { |
131 | .procname = "sunrpc", |
132 | .mode = 0555, |
133 | .child = xs_tunables_table |
134 | }, |
135 | { }, |
136 | }; |
137 | |
138 | #endif |
139 | |
140 | /* |
141 | * Time out for an RPC UDP socket connect. UDP socket connects are |
142 | * synchronous, but we set a timeout anyway in case of resource |
143 | * exhaustion on the local host. |
144 | */ |
145 | #define XS_UDP_CONN_TO (5U * HZ) |
146 | |
147 | /* |
148 | * Wait duration for an RPC TCP connection to be established. Solaris |
149 | * NFS over TCP uses 60 seconds, for example, which is in line with how |
150 | * long a server takes to reboot. |
151 | */ |
152 | #define XS_TCP_CONN_TO (60U * HZ) |
153 | |
154 | /* |
155 | * Wait duration for a reply from the RPC portmapper. |
156 | */ |
157 | #define XS_BIND_TO (60U * HZ) |
158 | |
159 | /* |
160 | * Delay if a UDP socket connect error occurs. This is most likely some |
161 | * kind of resource problem on the local host. |
162 | */ |
163 | #define XS_UDP_REEST_TO (2U * HZ) |
164 | |
165 | /* |
166 | * The reestablish timeout allows clients to delay for a bit before attempting |
167 | * to reconnect to a server that just dropped our connection. |
168 | * |
169 | * We implement an exponential backoff when trying to reestablish a TCP |
170 | * transport connection with the server. Some servers like to drop a TCP |
171 | * connection when they are overworked, so we start with a short timeout and |
172 | * increase over time if the server is down or not responding. |
173 | */ |
174 | #define XS_TCP_INIT_REEST_TO (3U * HZ) |
175 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) |
176 | |
177 | /* |
178 | * TCP idle timeout; client drops the transport socket if it is idle |
179 | * for this long. Note that we also timeout UDP sockets to prevent |
180 | * holding port numbers when there is no RPC traffic. |
181 | */ |
182 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) |
183 | |
184 | #ifdef RPC_DEBUG |
185 | # undef RPC_DEBUG_DATA |
186 | # define RPCDBG_FACILITY RPCDBG_TRANS |
187 | #endif |
188 | |
189 | #ifdef RPC_DEBUG_DATA |
190 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
191 | { |
192 | u8 *buf = (u8 *) packet; |
193 | int j; |
194 | |
195 | dprintk("RPC: %s\n", msg); |
196 | for (j = 0; j < count && j < 128; j += 4) { |
197 | if (!(j & 31)) { |
198 | if (j) |
199 | dprintk("\n"); |
200 | dprintk("0x%04x ", j); |
201 | } |
202 | dprintk("%02x%02x%02x%02x ", |
203 | buf[j], buf[j+1], buf[j+2], buf[j+3]); |
204 | } |
205 | dprintk("\n"); |
206 | } |
207 | #else |
208 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
209 | { |
210 | /* NOP */ |
211 | } |
212 | #endif |
213 | |
214 | struct sock_xprt { |
215 | struct rpc_xprt xprt; |
216 | |
217 | /* |
218 | * Network layer |
219 | */ |
220 | struct socket * sock; |
221 | struct sock * inet; |
222 | |
223 | /* |
224 | * State of TCP reply receive |
225 | */ |
226 | __be32 tcp_fraghdr, |
227 | tcp_xid; |
228 | |
229 | u32 tcp_offset, |
230 | tcp_reclen; |
231 | |
232 | unsigned long tcp_copied, |
233 | tcp_flags; |
234 | |
235 | /* |
236 | * Connection of transports |
237 | */ |
238 | struct delayed_work connect_worker; |
239 | struct sockaddr_storage srcaddr; |
240 | unsigned short srcport; |
241 | |
242 | /* |
243 | * UDP socket buffer size parameters |
244 | */ |
245 | size_t rcvsize, |
246 | sndsize; |
247 | |
248 | /* |
249 | * Saved socket callback addresses |
250 | */ |
251 | void (*old_data_ready)(struct sock *, int); |
252 | void (*old_state_change)(struct sock *); |
253 | void (*old_write_space)(struct sock *); |
254 | void (*old_error_report)(struct sock *); |
255 | }; |
256 | |
257 | /* |
258 | * TCP receive state flags |
259 | */ |
260 | #define TCP_RCV_LAST_FRAG (1UL << 0) |
261 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) |
262 | #define TCP_RCV_COPY_XID (1UL << 2) |
263 | #define TCP_RCV_COPY_DATA (1UL << 3) |
264 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
265 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) |
266 | |
267 | /* |
268 | * TCP RPC flags |
269 | */ |
270 | #define TCP_RPC_REPLY (1UL << 6) |
271 | |
272 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
273 | { |
274 | return (struct sockaddr *) &xprt->addr; |
275 | } |
276 | |
277 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
278 | { |
279 | return (struct sockaddr_in *) &xprt->addr; |
280 | } |
281 | |
282 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) |
283 | { |
284 | return (struct sockaddr_in6 *) &xprt->addr; |
285 | } |
286 | |
287 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
288 | { |
289 | struct sockaddr *sap = xs_addr(xprt); |
290 | struct sockaddr_in6 *sin6; |
291 | struct sockaddr_in *sin; |
292 | char buf[128]; |
293 | |
294 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
295 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); |
296 | |
297 | switch (sap->sa_family) { |
298 | case AF_INET: |
299 | sin = xs_addr_in(xprt); |
300 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
301 | break; |
302 | case AF_INET6: |
303 | sin6 = xs_addr_in6(xprt); |
304 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
305 | break; |
306 | default: |
307 | BUG(); |
308 | } |
309 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
310 | } |
311 | |
312 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
313 | { |
314 | struct sockaddr *sap = xs_addr(xprt); |
315 | char buf[128]; |
316 | |
317 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
318 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
319 | |
320 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
321 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
322 | } |
323 | |
324 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
325 | const char *protocol, |
326 | const char *netid) |
327 | { |
328 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
329 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
330 | xs_format_common_peer_addresses(xprt); |
331 | xs_format_common_peer_ports(xprt); |
332 | } |
333 | |
334 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
335 | { |
336 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
337 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); |
338 | |
339 | xs_format_common_peer_ports(xprt); |
340 | } |
341 | |
342 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) |
343 | { |
344 | unsigned int i; |
345 | |
346 | for (i = 0; i < RPC_DISPLAY_MAX; i++) |
347 | switch (i) { |
348 | case RPC_DISPLAY_PROTO: |
349 | case RPC_DISPLAY_NETID: |
350 | continue; |
351 | default: |
352 | kfree(xprt->address_strings[i]); |
353 | } |
354 | } |
355 | |
356 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
357 | |
358 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
359 | { |
360 | struct msghdr msg = { |
361 | .msg_name = addr, |
362 | .msg_namelen = addrlen, |
363 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
364 | }; |
365 | struct kvec iov = { |
366 | .iov_base = vec->iov_base + base, |
367 | .iov_len = vec->iov_len - base, |
368 | }; |
369 | |
370 | if (iov.iov_len != 0) |
371 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
372 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); |
373 | } |
374 | |
375 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
376 | { |
377 | struct page **ppage; |
378 | unsigned int remainder; |
379 | int err, sent = 0; |
380 | |
381 | remainder = xdr->page_len - base; |
382 | base += xdr->page_base; |
383 | ppage = xdr->pages + (base >> PAGE_SHIFT); |
384 | base &= ~PAGE_MASK; |
385 | for(;;) { |
386 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); |
387 | int flags = XS_SENDMSG_FLAGS; |
388 | |
389 | remainder -= len; |
390 | if (remainder != 0 || more) |
391 | flags |= MSG_MORE; |
392 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); |
393 | if (remainder == 0 || err != len) |
394 | break; |
395 | sent += err; |
396 | ppage++; |
397 | base = 0; |
398 | } |
399 | if (sent == 0) |
400 | return err; |
401 | if (err > 0) |
402 | sent += err; |
403 | return sent; |
404 | } |
405 | |
406 | /** |
407 | * xs_sendpages - write pages directly to a socket |
408 | * @sock: socket to send on |
409 | * @addr: UDP only -- address of destination |
410 | * @addrlen: UDP only -- length of destination address |
411 | * @xdr: buffer containing this request |
412 | * @base: starting position in the buffer |
413 | * |
414 | */ |
415 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
416 | { |
417 | unsigned int remainder = xdr->len - base; |
418 | int err, sent = 0; |
419 | |
420 | if (unlikely(!sock)) |
421 | return -ENOTSOCK; |
422 | |
423 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); |
424 | if (base != 0) { |
425 | addr = NULL; |
426 | addrlen = 0; |
427 | } |
428 | |
429 | if (base < xdr->head[0].iov_len || addr != NULL) { |
430 | unsigned int len = xdr->head[0].iov_len - base; |
431 | remainder -= len; |
432 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); |
433 | if (remainder == 0 || err != len) |
434 | goto out; |
435 | sent += err; |
436 | base = 0; |
437 | } else |
438 | base -= xdr->head[0].iov_len; |
439 | |
440 | if (base < xdr->page_len) { |
441 | unsigned int len = xdr->page_len - base; |
442 | remainder -= len; |
443 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); |
444 | if (remainder == 0 || err != len) |
445 | goto out; |
446 | sent += err; |
447 | base = 0; |
448 | } else |
449 | base -= xdr->page_len; |
450 | |
451 | if (base >= xdr->tail[0].iov_len) |
452 | return sent; |
453 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); |
454 | out: |
455 | if (sent == 0) |
456 | return err; |
457 | if (err > 0) |
458 | sent += err; |
459 | return sent; |
460 | } |
461 | |
462 | static void xs_nospace_callback(struct rpc_task *task) |
463 | { |
464 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); |
465 | |
466 | transport->inet->sk_write_pending--; |
467 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
468 | } |
469 | |
470 | /** |
471 | * xs_nospace - place task on wait queue if transmit was incomplete |
472 | * @task: task to put to sleep |
473 | * |
474 | */ |
475 | static int xs_nospace(struct rpc_task *task) |
476 | { |
477 | struct rpc_rqst *req = task->tk_rqstp; |
478 | struct rpc_xprt *xprt = req->rq_xprt; |
479 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
480 | int ret = 0; |
481 | |
482 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
483 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
484 | req->rq_slen); |
485 | |
486 | /* Protect against races with write_space */ |
487 | spin_lock_bh(&xprt->transport_lock); |
488 | |
489 | /* Don't race with disconnect */ |
490 | if (xprt_connected(xprt)) { |
491 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { |
492 | ret = -EAGAIN; |
493 | /* |
494 | * Notify TCP that we're limited by the application |
495 | * window size |
496 | */ |
497 | set_bit(SOCK_NOSPACE, &transport->sock->flags); |
498 | transport->inet->sk_write_pending++; |
499 | /* ...and wait for more buffer space */ |
500 | xprt_wait_for_buffer_space(task, xs_nospace_callback); |
501 | } |
502 | } else { |
503 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
504 | ret = -ENOTCONN; |
505 | } |
506 | |
507 | spin_unlock_bh(&xprt->transport_lock); |
508 | return ret; |
509 | } |
510 | |
511 | /** |
512 | * xs_udp_send_request - write an RPC request to a UDP socket |
513 | * @task: address of RPC task that manages the state of an RPC request |
514 | * |
515 | * Return values: |
516 | * 0: The request has been sent |
517 | * EAGAIN: The socket was blocked, please call again later to |
518 | * complete the request |
519 | * ENOTCONN: Caller needs to invoke connect logic then call again |
520 | * other: Some other error occured, the request was not sent |
521 | */ |
522 | static int xs_udp_send_request(struct rpc_task *task) |
523 | { |
524 | struct rpc_rqst *req = task->tk_rqstp; |
525 | struct rpc_xprt *xprt = req->rq_xprt; |
526 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
527 | struct xdr_buf *xdr = &req->rq_snd_buf; |
528 | int status; |
529 | |
530 | xs_pktdump("packet data:", |
531 | req->rq_svec->iov_base, |
532 | req->rq_svec->iov_len); |
533 | |
534 | if (!xprt_bound(xprt)) |
535 | return -ENOTCONN; |
536 | status = xs_sendpages(transport->sock, |
537 | xs_addr(xprt), |
538 | xprt->addrlen, xdr, |
539 | req->rq_bytes_sent); |
540 | |
541 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
542 | xdr->len - req->rq_bytes_sent, status); |
543 | |
544 | if (status >= 0) { |
545 | task->tk_bytes_sent += status; |
546 | if (status >= req->rq_slen) |
547 | return 0; |
548 | /* Still some bytes left; set up for a retry later. */ |
549 | status = -EAGAIN; |
550 | } |
551 | |
552 | switch (status) { |
553 | case -ENOTSOCK: |
554 | status = -ENOTCONN; |
555 | /* Should we call xs_close() here? */ |
556 | break; |
557 | case -EAGAIN: |
558 | status = xs_nospace(task); |
559 | break; |
560 | default: |
561 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
562 | -status); |
563 | case -ENETUNREACH: |
564 | case -EPIPE: |
565 | case -ECONNREFUSED: |
566 | /* When the server has died, an ICMP port unreachable message |
567 | * prompts ECONNREFUSED. */ |
568 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
569 | } |
570 | |
571 | return status; |
572 | } |
573 | |
574 | /** |
575 | * xs_tcp_shutdown - gracefully shut down a TCP socket |
576 | * @xprt: transport |
577 | * |
578 | * Initiates a graceful shutdown of the TCP socket by calling the |
579 | * equivalent of shutdown(SHUT_WR); |
580 | */ |
581 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) |
582 | { |
583 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
584 | struct socket *sock = transport->sock; |
585 | |
586 | if (sock != NULL) |
587 | kernel_sock_shutdown(sock, SHUT_WR); |
588 | } |
589 | |
590 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
591 | { |
592 | u32 reclen = buf->len - sizeof(rpc_fraghdr); |
593 | rpc_fraghdr *base = buf->head[0].iov_base; |
594 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); |
595 | } |
596 | |
597 | /** |
598 | * xs_tcp_send_request - write an RPC request to a TCP socket |
599 | * @task: address of RPC task that manages the state of an RPC request |
600 | * |
601 | * Return values: |
602 | * 0: The request has been sent |
603 | * EAGAIN: The socket was blocked, please call again later to |
604 | * complete the request |
605 | * ENOTCONN: Caller needs to invoke connect logic then call again |
606 | * other: Some other error occured, the request was not sent |
607 | * |
608 | * XXX: In the case of soft timeouts, should we eventually give up |
609 | * if sendmsg is not able to make progress? |
610 | */ |
611 | static int xs_tcp_send_request(struct rpc_task *task) |
612 | { |
613 | struct rpc_rqst *req = task->tk_rqstp; |
614 | struct rpc_xprt *xprt = req->rq_xprt; |
615 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
616 | struct xdr_buf *xdr = &req->rq_snd_buf; |
617 | int status; |
618 | |
619 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
620 | |
621 | xs_pktdump("packet data:", |
622 | req->rq_svec->iov_base, |
623 | req->rq_svec->iov_len); |
624 | |
625 | /* Continue transmitting the packet/record. We must be careful |
626 | * to cope with writespace callbacks arriving _after_ we have |
627 | * called sendmsg(). */ |
628 | while (1) { |
629 | status = xs_sendpages(transport->sock, |
630 | NULL, 0, xdr, req->rq_bytes_sent); |
631 | |
632 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
633 | xdr->len - req->rq_bytes_sent, status); |
634 | |
635 | if (unlikely(status < 0)) |
636 | break; |
637 | |
638 | /* If we've sent the entire packet, immediately |
639 | * reset the count of bytes sent. */ |
640 | req->rq_bytes_sent += status; |
641 | task->tk_bytes_sent += status; |
642 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
643 | req->rq_bytes_sent = 0; |
644 | return 0; |
645 | } |
646 | |
647 | if (status != 0) |
648 | continue; |
649 | status = -EAGAIN; |
650 | break; |
651 | } |
652 | |
653 | switch (status) { |
654 | case -ENOTSOCK: |
655 | status = -ENOTCONN; |
656 | /* Should we call xs_close() here? */ |
657 | break; |
658 | case -EAGAIN: |
659 | status = xs_nospace(task); |
660 | break; |
661 | default: |
662 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
663 | -status); |
664 | case -ECONNRESET: |
665 | case -EPIPE: |
666 | xs_tcp_shutdown(xprt); |
667 | case -ECONNREFUSED: |
668 | case -ENOTCONN: |
669 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
670 | } |
671 | |
672 | return status; |
673 | } |
674 | |
675 | /** |
676 | * xs_tcp_release_xprt - clean up after a tcp transmission |
677 | * @xprt: transport |
678 | * @task: rpc task |
679 | * |
680 | * This cleans up if an error causes us to abort the transmission of a request. |
681 | * In this case, the socket may need to be reset in order to avoid confusing |
682 | * the server. |
683 | */ |
684 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
685 | { |
686 | struct rpc_rqst *req; |
687 | |
688 | if (task != xprt->snd_task) |
689 | return; |
690 | if (task == NULL) |
691 | goto out_release; |
692 | req = task->tk_rqstp; |
693 | if (req->rq_bytes_sent == 0) |
694 | goto out_release; |
695 | if (req->rq_bytes_sent == req->rq_snd_buf.len) |
696 | goto out_release; |
697 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); |
698 | out_release: |
699 | xprt_release_xprt(xprt, task); |
700 | } |
701 | |
702 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
703 | { |
704 | transport->old_data_ready = sk->sk_data_ready; |
705 | transport->old_state_change = sk->sk_state_change; |
706 | transport->old_write_space = sk->sk_write_space; |
707 | transport->old_error_report = sk->sk_error_report; |
708 | } |
709 | |
710 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
711 | { |
712 | sk->sk_data_ready = transport->old_data_ready; |
713 | sk->sk_state_change = transport->old_state_change; |
714 | sk->sk_write_space = transport->old_write_space; |
715 | sk->sk_error_report = transport->old_error_report; |
716 | } |
717 | |
718 | static void xs_reset_transport(struct sock_xprt *transport) |
719 | { |
720 | struct socket *sock = transport->sock; |
721 | struct sock *sk = transport->inet; |
722 | |
723 | if (sk == NULL) |
724 | return; |
725 | |
726 | write_lock_bh(&sk->sk_callback_lock); |
727 | transport->inet = NULL; |
728 | transport->sock = NULL; |
729 | |
730 | sk->sk_user_data = NULL; |
731 | |
732 | xs_restore_old_callbacks(transport, sk); |
733 | write_unlock_bh(&sk->sk_callback_lock); |
734 | |
735 | sk->sk_no_check = 0; |
736 | |
737 | sock_release(sock); |
738 | } |
739 | |
740 | /** |
741 | * xs_close - close a socket |
742 | * @xprt: transport |
743 | * |
744 | * This is used when all requests are complete; ie, no DRC state remains |
745 | * on the server we want to save. |
746 | * |
747 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with |
748 | * xs_reset_transport() zeroing the socket from underneath a writer. |
749 | */ |
750 | static void xs_close(struct rpc_xprt *xprt) |
751 | { |
752 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
753 | |
754 | dprintk("RPC: xs_close xprt %p\n", xprt); |
755 | |
756 | xs_reset_transport(transport); |
757 | xprt->reestablish_timeout = 0; |
758 | |
759 | smp_mb__before_clear_bit(); |
760 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
761 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
762 | clear_bit(XPRT_CLOSING, &xprt->state); |
763 | smp_mb__after_clear_bit(); |
764 | xprt_disconnect_done(xprt); |
765 | } |
766 | |
767 | static void xs_tcp_close(struct rpc_xprt *xprt) |
768 | { |
769 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) |
770 | xs_close(xprt); |
771 | else |
772 | xs_tcp_shutdown(xprt); |
773 | } |
774 | |
775 | /** |
776 | * xs_destroy - prepare to shutdown a transport |
777 | * @xprt: doomed transport |
778 | * |
779 | */ |
780 | static void xs_destroy(struct rpc_xprt *xprt) |
781 | { |
782 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
783 | |
784 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
785 | |
786 | cancel_rearming_delayed_work(&transport->connect_worker); |
787 | |
788 | xs_close(xprt); |
789 | xs_free_peer_addresses(xprt); |
790 | kfree(xprt->slot); |
791 | kfree(xprt); |
792 | module_put(THIS_MODULE); |
793 | } |
794 | |
795 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
796 | { |
797 | return (struct rpc_xprt *) sk->sk_user_data; |
798 | } |
799 | |
800 | /** |
801 | * xs_udp_data_ready - "data ready" callback for UDP sockets |
802 | * @sk: socket with data to read |
803 | * @len: how much data to read |
804 | * |
805 | */ |
806 | static void xs_udp_data_ready(struct sock *sk, int len) |
807 | { |
808 | struct rpc_task *task; |
809 | struct rpc_xprt *xprt; |
810 | struct rpc_rqst *rovr; |
811 | struct sk_buff *skb; |
812 | int err, repsize, copied; |
813 | u32 _xid; |
814 | __be32 *xp; |
815 | |
816 | read_lock(&sk->sk_callback_lock); |
817 | dprintk("RPC: xs_udp_data_ready...\n"); |
818 | if (!(xprt = xprt_from_sock(sk))) |
819 | goto out; |
820 | |
821 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) |
822 | goto out; |
823 | |
824 | if (xprt->shutdown) |
825 | goto dropit; |
826 | |
827 | repsize = skb->len - sizeof(struct udphdr); |
828 | if (repsize < 4) { |
829 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
830 | goto dropit; |
831 | } |
832 | |
833 | /* Copy the XID from the skb... */ |
834 | xp = skb_header_pointer(skb, sizeof(struct udphdr), |
835 | sizeof(_xid), &_xid); |
836 | if (xp == NULL) |
837 | goto dropit; |
838 | |
839 | /* Look up and lock the request corresponding to the given XID */ |
840 | spin_lock(&xprt->transport_lock); |
841 | rovr = xprt_lookup_rqst(xprt, *xp); |
842 | if (!rovr) |
843 | goto out_unlock; |
844 | task = rovr->rq_task; |
845 | |
846 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
847 | copied = repsize; |
848 | |
849 | /* Suck it into the iovec, verify checksum if not done by hw. */ |
850 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
851 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); |
852 | goto out_unlock; |
853 | } |
854 | |
855 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); |
856 | |
857 | /* Something worked... */ |
858 | dst_confirm(skb_dst(skb)); |
859 | |
860 | xprt_adjust_cwnd(task, copied); |
861 | xprt_update_rtt(task); |
862 | xprt_complete_rqst(task, copied); |
863 | |
864 | out_unlock: |
865 | spin_unlock(&xprt->transport_lock); |
866 | dropit: |
867 | skb_free_datagram(sk, skb); |
868 | out: |
869 | read_unlock(&sk->sk_callback_lock); |
870 | } |
871 | |
872 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
873 | { |
874 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
875 | size_t len, used; |
876 | char *p; |
877 | |
878 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
879 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; |
880 | used = xdr_skb_read_bits(desc, p, len); |
881 | transport->tcp_offset += used; |
882 | if (used != len) |
883 | return; |
884 | |
885 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
886 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) |
887 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
888 | else |
889 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
890 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
891 | |
892 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
893 | transport->tcp_offset = 0; |
894 | |
895 | /* Sanity check of the record length */ |
896 | if (unlikely(transport->tcp_reclen < 8)) { |
897 | dprintk("RPC: invalid TCP record fragment length\n"); |
898 | xprt_force_disconnect(xprt); |
899 | return; |
900 | } |
901 | dprintk("RPC: reading TCP record fragment of length %d\n", |
902 | transport->tcp_reclen); |
903 | } |
904 | |
905 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
906 | { |
907 | if (transport->tcp_offset == transport->tcp_reclen) { |
908 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
909 | transport->tcp_offset = 0; |
910 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
911 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
912 | transport->tcp_flags |= TCP_RCV_COPY_XID; |
913 | transport->tcp_copied = 0; |
914 | } |
915 | } |
916 | } |
917 | |
918 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
919 | { |
920 | size_t len, used; |
921 | char *p; |
922 | |
923 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
924 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
925 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
926 | used = xdr_skb_read_bits(desc, p, len); |
927 | transport->tcp_offset += used; |
928 | if (used != len) |
929 | return; |
930 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
931 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
932 | transport->tcp_copied = 4; |
933 | dprintk("RPC: reading %s XID %08x\n", |
934 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" |
935 | : "request with", |
936 | ntohl(transport->tcp_xid)); |
937 | xs_tcp_check_fraghdr(transport); |
938 | } |
939 | |
940 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
941 | struct xdr_skb_reader *desc) |
942 | { |
943 | size_t len, used; |
944 | u32 offset; |
945 | __be32 calldir; |
946 | |
947 | /* |
948 | * We want transport->tcp_offset to be 8 at the end of this routine |
949 | * (4 bytes for the xid and 4 bytes for the call/reply flag). |
950 | * When this function is called for the first time, |
951 | * transport->tcp_offset is 4 (after having already read the xid). |
952 | */ |
953 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); |
954 | len = sizeof(calldir) - offset; |
955 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
956 | used = xdr_skb_read_bits(desc, &calldir, len); |
957 | transport->tcp_offset += used; |
958 | if (used != len) |
959 | return; |
960 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
961 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; |
962 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
963 | /* |
964 | * We don't yet have the XDR buffer, so we will write the calldir |
965 | * out after we get the buffer from the 'struct rpc_rqst' |
966 | */ |
967 | if (ntohl(calldir) == RPC_REPLY) |
968 | transport->tcp_flags |= TCP_RPC_REPLY; |
969 | else |
970 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
971 | dprintk("RPC: reading %s CALL/REPLY flag %08x\n", |
972 | (transport->tcp_flags & TCP_RPC_REPLY) ? |
973 | "reply for" : "request with", calldir); |
974 | xs_tcp_check_fraghdr(transport); |
975 | } |
976 | |
977 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
978 | struct xdr_skb_reader *desc, |
979 | struct rpc_rqst *req) |
980 | { |
981 | struct sock_xprt *transport = |
982 | container_of(xprt, struct sock_xprt, xprt); |
983 | struct xdr_buf *rcvbuf; |
984 | size_t len; |
985 | ssize_t r; |
986 | |
987 | rcvbuf = &req->rq_private_buf; |
988 | |
989 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { |
990 | /* |
991 | * Save the RPC direction in the XDR buffer |
992 | */ |
993 | __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? |
994 | htonl(RPC_REPLY) : 0; |
995 | |
996 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
997 | &calldir, sizeof(calldir)); |
998 | transport->tcp_copied += sizeof(calldir); |
999 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
1000 | } |
1001 | |
1002 | len = desc->count; |
1003 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
1004 | struct xdr_skb_reader my_desc; |
1005 | |
1006 | len = transport->tcp_reclen - transport->tcp_offset; |
1007 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1008 | my_desc.count = len; |
1009 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
1010 | &my_desc, xdr_skb_read_bits); |
1011 | desc->count -= r; |
1012 | desc->offset += r; |
1013 | } else |
1014 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
1015 | desc, xdr_skb_read_bits); |
1016 | |
1017 | if (r > 0) { |
1018 | transport->tcp_copied += r; |
1019 | transport->tcp_offset += r; |
1020 | } |
1021 | if (r != len) { |
1022 | /* Error when copying to the receive buffer, |
1023 | * usually because we weren't able to allocate |
1024 | * additional buffer pages. All we can do now |
1025 | * is turn off TCP_RCV_COPY_DATA, so the request |
1026 | * will not receive any additional updates, |
1027 | * and time out. |
1028 | * Any remaining data from this record will |
1029 | * be discarded. |
1030 | */ |
1031 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1032 | dprintk("RPC: XID %08x truncated request\n", |
1033 | ntohl(transport->tcp_xid)); |
1034 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1035 | "tcp_offset = %u, tcp_reclen = %u\n", |
1036 | xprt, transport->tcp_copied, |
1037 | transport->tcp_offset, transport->tcp_reclen); |
1038 | return; |
1039 | } |
1040 | |
1041 | dprintk("RPC: XID %08x read %Zd bytes\n", |
1042 | ntohl(transport->tcp_xid), r); |
1043 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1044 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, |
1045 | transport->tcp_offset, transport->tcp_reclen); |
1046 | |
1047 | if (transport->tcp_copied == req->rq_private_buf.buflen) |
1048 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1049 | else if (transport->tcp_offset == transport->tcp_reclen) { |
1050 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1051 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1052 | } |
1053 | |
1054 | return; |
1055 | } |
1056 | |
1057 | /* |
1058 | * Finds the request corresponding to the RPC xid and invokes the common |
1059 | * tcp read code to read the data. |
1060 | */ |
1061 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, |
1062 | struct xdr_skb_reader *desc) |
1063 | { |
1064 | struct sock_xprt *transport = |
1065 | container_of(xprt, struct sock_xprt, xprt); |
1066 | struct rpc_rqst *req; |
1067 | |
1068 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); |
1069 | |
1070 | /* Find and lock the request corresponding to this xid */ |
1071 | spin_lock(&xprt->transport_lock); |
1072 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
1073 | if (!req) { |
1074 | dprintk("RPC: XID %08x request not found!\n", |
1075 | ntohl(transport->tcp_xid)); |
1076 | spin_unlock(&xprt->transport_lock); |
1077 | return -1; |
1078 | } |
1079 | |
1080 | xs_tcp_read_common(xprt, desc, req); |
1081 | |
1082 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
1083 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
1084 | |
1085 | spin_unlock(&xprt->transport_lock); |
1086 | return 0; |
1087 | } |
1088 | |
1089 | #if defined(CONFIG_NFS_V4_1) |
1090 | /* |
1091 | * Obtains an rpc_rqst previously allocated and invokes the common |
1092 | * tcp read code to read the data. The result is placed in the callback |
1093 | * queue. |
1094 | * If we're unable to obtain the rpc_rqst we schedule the closing of the |
1095 | * connection and return -1. |
1096 | */ |
1097 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, |
1098 | struct xdr_skb_reader *desc) |
1099 | { |
1100 | struct sock_xprt *transport = |
1101 | container_of(xprt, struct sock_xprt, xprt); |
1102 | struct rpc_rqst *req; |
1103 | |
1104 | req = xprt_alloc_bc_request(xprt); |
1105 | if (req == NULL) { |
1106 | printk(KERN_WARNING "Callback slot table overflowed\n"); |
1107 | xprt_force_disconnect(xprt); |
1108 | return -1; |
1109 | } |
1110 | |
1111 | req->rq_xid = transport->tcp_xid; |
1112 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); |
1113 | xs_tcp_read_common(xprt, desc, req); |
1114 | |
1115 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { |
1116 | struct svc_serv *bc_serv = xprt->bc_serv; |
1117 | |
1118 | /* |
1119 | * Add callback request to callback list. The callback |
1120 | * service sleeps on the sv_cb_waitq waiting for new |
1121 | * requests. Wake it up after adding enqueing the |
1122 | * request. |
1123 | */ |
1124 | dprintk("RPC: add callback request to list\n"); |
1125 | spin_lock(&bc_serv->sv_cb_lock); |
1126 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); |
1127 | spin_unlock(&bc_serv->sv_cb_lock); |
1128 | wake_up(&bc_serv->sv_cb_waitq); |
1129 | } |
1130 | |
1131 | req->rq_private_buf.len = transport->tcp_copied; |
1132 | |
1133 | return 0; |
1134 | } |
1135 | |
1136 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, |
1137 | struct xdr_skb_reader *desc) |
1138 | { |
1139 | struct sock_xprt *transport = |
1140 | container_of(xprt, struct sock_xprt, xprt); |
1141 | |
1142 | return (transport->tcp_flags & TCP_RPC_REPLY) ? |
1143 | xs_tcp_read_reply(xprt, desc) : |
1144 | xs_tcp_read_callback(xprt, desc); |
1145 | } |
1146 | #else |
1147 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, |
1148 | struct xdr_skb_reader *desc) |
1149 | { |
1150 | return xs_tcp_read_reply(xprt, desc); |
1151 | } |
1152 | #endif /* CONFIG_NFS_V4_1 */ |
1153 | |
1154 | /* |
1155 | * Read data off the transport. This can be either an RPC_CALL or an |
1156 | * RPC_REPLY. Relay the processing to helper functions. |
1157 | */ |
1158 | static void xs_tcp_read_data(struct rpc_xprt *xprt, |
1159 | struct xdr_skb_reader *desc) |
1160 | { |
1161 | struct sock_xprt *transport = |
1162 | container_of(xprt, struct sock_xprt, xprt); |
1163 | |
1164 | if (_xs_tcp_read_data(xprt, desc) == 0) |
1165 | xs_tcp_check_fraghdr(transport); |
1166 | else { |
1167 | /* |
1168 | * The transport_lock protects the request handling. |
1169 | * There's no need to hold it to update the tcp_flags. |
1170 | */ |
1171 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1172 | } |
1173 | } |
1174 | |
1175 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
1176 | { |
1177 | size_t len; |
1178 | |
1179 | len = transport->tcp_reclen - transport->tcp_offset; |
1180 | if (len > desc->count) |
1181 | len = desc->count; |
1182 | desc->count -= len; |
1183 | desc->offset += len; |
1184 | transport->tcp_offset += len; |
1185 | dprintk("RPC: discarded %Zu bytes\n", len); |
1186 | xs_tcp_check_fraghdr(transport); |
1187 | } |
1188 | |
1189 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
1190 | { |
1191 | struct rpc_xprt *xprt = rd_desc->arg.data; |
1192 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1193 | struct xdr_skb_reader desc = { |
1194 | .skb = skb, |
1195 | .offset = offset, |
1196 | .count = len, |
1197 | }; |
1198 | |
1199 | dprintk("RPC: xs_tcp_data_recv started\n"); |
1200 | do { |
1201 | /* Read in a new fragment marker if necessary */ |
1202 | /* Can we ever really expect to get completely empty fragments? */ |
1203 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
1204 | xs_tcp_read_fraghdr(xprt, &desc); |
1205 | continue; |
1206 | } |
1207 | /* Read in the xid if necessary */ |
1208 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
1209 | xs_tcp_read_xid(transport, &desc); |
1210 | continue; |
1211 | } |
1212 | /* Read in the call/reply flag */ |
1213 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
1214 | xs_tcp_read_calldir(transport, &desc); |
1215 | continue; |
1216 | } |
1217 | /* Read in the request data */ |
1218 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
1219 | xs_tcp_read_data(xprt, &desc); |
1220 | continue; |
1221 | } |
1222 | /* Skip over any trailing bytes on short reads */ |
1223 | xs_tcp_read_discard(transport, &desc); |
1224 | } while (desc.count); |
1225 | dprintk("RPC: xs_tcp_data_recv done\n"); |
1226 | return len - desc.count; |
1227 | } |
1228 | |
1229 | /** |
1230 | * xs_tcp_data_ready - "data ready" callback for TCP sockets |
1231 | * @sk: socket with data to read |
1232 | * @bytes: how much data to read |
1233 | * |
1234 | */ |
1235 | static void xs_tcp_data_ready(struct sock *sk, int bytes) |
1236 | { |
1237 | struct rpc_xprt *xprt; |
1238 | read_descriptor_t rd_desc; |
1239 | int read; |
1240 | |
1241 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1242 | |
1243 | read_lock(&sk->sk_callback_lock); |
1244 | if (!(xprt = xprt_from_sock(sk))) |
1245 | goto out; |
1246 | if (xprt->shutdown) |
1247 | goto out; |
1248 | |
1249 | /* Any data means we had a useful conversation, so |
1250 | * the we don't need to delay the next reconnect |
1251 | */ |
1252 | if (xprt->reestablish_timeout) |
1253 | xprt->reestablish_timeout = 0; |
1254 | |
1255 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
1256 | rd_desc.arg.data = xprt; |
1257 | do { |
1258 | rd_desc.count = 65536; |
1259 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
1260 | } while (read > 0); |
1261 | out: |
1262 | read_unlock(&sk->sk_callback_lock); |
1263 | } |
1264 | |
1265 | /* |
1266 | * Do the equivalent of linger/linger2 handling for dealing with |
1267 | * broken servers that don't close the socket in a timely |
1268 | * fashion |
1269 | */ |
1270 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, |
1271 | unsigned long timeout) |
1272 | { |
1273 | struct sock_xprt *transport; |
1274 | |
1275 | if (xprt_test_and_set_connecting(xprt)) |
1276 | return; |
1277 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1278 | transport = container_of(xprt, struct sock_xprt, xprt); |
1279 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, |
1280 | timeout); |
1281 | } |
1282 | |
1283 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) |
1284 | { |
1285 | struct sock_xprt *transport; |
1286 | |
1287 | transport = container_of(xprt, struct sock_xprt, xprt); |
1288 | |
1289 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || |
1290 | !cancel_delayed_work(&transport->connect_worker)) |
1291 | return; |
1292 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1293 | xprt_clear_connecting(xprt); |
1294 | } |
1295 | |
1296 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) |
1297 | { |
1298 | smp_mb__before_clear_bit(); |
1299 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1300 | clear_bit(XPRT_CLOSING, &xprt->state); |
1301 | smp_mb__after_clear_bit(); |
1302 | /* Mark transport as closed and wake up all pending tasks */ |
1303 | xprt_disconnect_done(xprt); |
1304 | } |
1305 | |
1306 | /** |
1307 | * xs_tcp_state_change - callback to handle TCP socket state changes |
1308 | * @sk: socket whose state has changed |
1309 | * |
1310 | */ |
1311 | static void xs_tcp_state_change(struct sock *sk) |
1312 | { |
1313 | struct rpc_xprt *xprt; |
1314 | |
1315 | read_lock(&sk->sk_callback_lock); |
1316 | if (!(xprt = xprt_from_sock(sk))) |
1317 | goto out; |
1318 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1319 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", |
1320 | sk->sk_state, xprt_connected(xprt), |
1321 | sock_flag(sk, SOCK_DEAD), |
1322 | sock_flag(sk, SOCK_ZAPPED)); |
1323 | |
1324 | switch (sk->sk_state) { |
1325 | case TCP_ESTABLISHED: |
1326 | spin_lock_bh(&xprt->transport_lock); |
1327 | if (!xprt_test_and_set_connected(xprt)) { |
1328 | struct sock_xprt *transport = container_of(xprt, |
1329 | struct sock_xprt, xprt); |
1330 | |
1331 | /* Reset TCP record info */ |
1332 | transport->tcp_offset = 0; |
1333 | transport->tcp_reclen = 0; |
1334 | transport->tcp_copied = 0; |
1335 | transport->tcp_flags = |
1336 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; |
1337 | |
1338 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
1339 | } |
1340 | spin_unlock_bh(&xprt->transport_lock); |
1341 | break; |
1342 | case TCP_FIN_WAIT1: |
1343 | /* The client initiated a shutdown of the socket */ |
1344 | xprt->connect_cookie++; |
1345 | xprt->reestablish_timeout = 0; |
1346 | set_bit(XPRT_CLOSING, &xprt->state); |
1347 | smp_mb__before_clear_bit(); |
1348 | clear_bit(XPRT_CONNECTED, &xprt->state); |
1349 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1350 | smp_mb__after_clear_bit(); |
1351 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
1352 | break; |
1353 | case TCP_CLOSE_WAIT: |
1354 | /* The server initiated a shutdown of the socket */ |
1355 | xprt_force_disconnect(xprt); |
1356 | case TCP_SYN_SENT: |
1357 | xprt->connect_cookie++; |
1358 | case TCP_CLOSING: |
1359 | /* |
1360 | * If the server closed down the connection, make sure that |
1361 | * we back off before reconnecting |
1362 | */ |
1363 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
1364 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
1365 | break; |
1366 | case TCP_LAST_ACK: |
1367 | set_bit(XPRT_CLOSING, &xprt->state); |
1368 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
1369 | smp_mb__before_clear_bit(); |
1370 | clear_bit(XPRT_CONNECTED, &xprt->state); |
1371 | smp_mb__after_clear_bit(); |
1372 | break; |
1373 | case TCP_CLOSE: |
1374 | xs_tcp_cancel_linger_timeout(xprt); |
1375 | xs_sock_mark_closed(xprt); |
1376 | } |
1377 | out: |
1378 | read_unlock(&sk->sk_callback_lock); |
1379 | } |
1380 | |
1381 | /** |
1382 | * xs_error_report - callback mainly for catching socket errors |
1383 | * @sk: socket |
1384 | */ |
1385 | static void xs_error_report(struct sock *sk) |
1386 | { |
1387 | struct rpc_xprt *xprt; |
1388 | |
1389 | read_lock(&sk->sk_callback_lock); |
1390 | if (!(xprt = xprt_from_sock(sk))) |
1391 | goto out; |
1392 | dprintk("RPC: %s client %p...\n" |
1393 | "RPC: error %d\n", |
1394 | __func__, xprt, sk->sk_err); |
1395 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
1396 | out: |
1397 | read_unlock(&sk->sk_callback_lock); |
1398 | } |
1399 | |
1400 | static void xs_write_space(struct sock *sk) |
1401 | { |
1402 | struct socket *sock; |
1403 | struct rpc_xprt *xprt; |
1404 | |
1405 | if (unlikely(!(sock = sk->sk_socket))) |
1406 | return; |
1407 | clear_bit(SOCK_NOSPACE, &sock->flags); |
1408 | |
1409 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
1410 | return; |
1411 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) |
1412 | return; |
1413 | |
1414 | xprt_write_space(xprt); |
1415 | } |
1416 | |
1417 | /** |
1418 | * xs_udp_write_space - callback invoked when socket buffer space |
1419 | * becomes available |
1420 | * @sk: socket whose state has changed |
1421 | * |
1422 | * Called when more output buffer space is available for this socket. |
1423 | * We try not to wake our writers until they can make "significant" |
1424 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
1425 | * with a bunch of small requests. |
1426 | */ |
1427 | static void xs_udp_write_space(struct sock *sk) |
1428 | { |
1429 | read_lock(&sk->sk_callback_lock); |
1430 | |
1431 | /* from net/core/sock.c:sock_def_write_space */ |
1432 | if (sock_writeable(sk)) |
1433 | xs_write_space(sk); |
1434 | |
1435 | read_unlock(&sk->sk_callback_lock); |
1436 | } |
1437 | |
1438 | /** |
1439 | * xs_tcp_write_space - callback invoked when socket buffer space |
1440 | * becomes available |
1441 | * @sk: socket whose state has changed |
1442 | * |
1443 | * Called when more output buffer space is available for this socket. |
1444 | * We try not to wake our writers until they can make "significant" |
1445 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
1446 | * with a bunch of small requests. |
1447 | */ |
1448 | static void xs_tcp_write_space(struct sock *sk) |
1449 | { |
1450 | read_lock(&sk->sk_callback_lock); |
1451 | |
1452 | /* from net/core/stream.c:sk_stream_write_space */ |
1453 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1454 | xs_write_space(sk); |
1455 | |
1456 | read_unlock(&sk->sk_callback_lock); |
1457 | } |
1458 | |
1459 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
1460 | { |
1461 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1462 | struct sock *sk = transport->inet; |
1463 | |
1464 | if (transport->rcvsize) { |
1465 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
1466 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
1467 | } |
1468 | if (transport->sndsize) { |
1469 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
1470 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
1471 | sk->sk_write_space(sk); |
1472 | } |
1473 | } |
1474 | |
1475 | /** |
1476 | * xs_udp_set_buffer_size - set send and receive limits |
1477 | * @xprt: generic transport |
1478 | * @sndsize: requested size of send buffer, in bytes |
1479 | * @rcvsize: requested size of receive buffer, in bytes |
1480 | * |
1481 | * Set socket send and receive buffer size limits. |
1482 | */ |
1483 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
1484 | { |
1485 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1486 | |
1487 | transport->sndsize = 0; |
1488 | if (sndsize) |
1489 | transport->sndsize = sndsize + 1024; |
1490 | transport->rcvsize = 0; |
1491 | if (rcvsize) |
1492 | transport->rcvsize = rcvsize + 1024; |
1493 | |
1494 | xs_udp_do_set_buffer_size(xprt); |
1495 | } |
1496 | |
1497 | /** |
1498 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport |
1499 | * @task: task that timed out |
1500 | * |
1501 | * Adjust the congestion window after a retransmit timeout has occurred. |
1502 | */ |
1503 | static void xs_udp_timer(struct rpc_task *task) |
1504 | { |
1505 | xprt_adjust_cwnd(task, -ETIMEDOUT); |
1506 | } |
1507 | |
1508 | static unsigned short xs_get_random_port(void) |
1509 | { |
1510 | unsigned short range = xprt_max_resvport - xprt_min_resvport; |
1511 | unsigned short rand = (unsigned short) net_random() % range; |
1512 | return rand + xprt_min_resvport; |
1513 | } |
1514 | |
1515 | /** |
1516 | * xs_set_port - reset the port number in the remote endpoint address |
1517 | * @xprt: generic transport |
1518 | * @port: new port number |
1519 | * |
1520 | */ |
1521 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) |
1522 | { |
1523 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
1524 | |
1525 | rpc_set_port(xs_addr(xprt), port); |
1526 | xs_update_peer_port(xprt); |
1527 | } |
1528 | |
1529 | static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) |
1530 | { |
1531 | unsigned short port = transport->srcport; |
1532 | |
1533 | if (port == 0 && transport->xprt.resvport) |
1534 | port = xs_get_random_port(); |
1535 | return port; |
1536 | } |
1537 | |
1538 | static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) |
1539 | { |
1540 | if (transport->srcport != 0) |
1541 | transport->srcport = 0; |
1542 | if (!transport->xprt.resvport) |
1543 | return 0; |
1544 | if (port <= xprt_min_resvport || port > xprt_max_resvport) |
1545 | return xprt_max_resvport; |
1546 | return --port; |
1547 | } |
1548 | |
1549 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
1550 | { |
1551 | struct sockaddr_in myaddr = { |
1552 | .sin_family = AF_INET, |
1553 | }; |
1554 | struct sockaddr_in *sa; |
1555 | int err, nloop = 0; |
1556 | unsigned short port = xs_get_srcport(transport, sock); |
1557 | unsigned short last; |
1558 | |
1559 | sa = (struct sockaddr_in *)&transport->srcaddr; |
1560 | myaddr.sin_addr = sa->sin_addr; |
1561 | do { |
1562 | myaddr.sin_port = htons(port); |
1563 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
1564 | sizeof(myaddr)); |
1565 | if (port == 0) |
1566 | break; |
1567 | if (err == 0) { |
1568 | transport->srcport = port; |
1569 | break; |
1570 | } |
1571 | last = port; |
1572 | port = xs_next_srcport(transport, sock, port); |
1573 | if (port > last) |
1574 | nloop++; |
1575 | } while (err == -EADDRINUSE && nloop != 2); |
1576 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", |
1577 | __func__, &myaddr.sin_addr, |
1578 | port, err ? "failed" : "ok", err); |
1579 | return err; |
1580 | } |
1581 | |
1582 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1583 | { |
1584 | struct sockaddr_in6 myaddr = { |
1585 | .sin6_family = AF_INET6, |
1586 | }; |
1587 | struct sockaddr_in6 *sa; |
1588 | int err, nloop = 0; |
1589 | unsigned short port = xs_get_srcport(transport, sock); |
1590 | unsigned short last; |
1591 | |
1592 | sa = (struct sockaddr_in6 *)&transport->srcaddr; |
1593 | myaddr.sin6_addr = sa->sin6_addr; |
1594 | do { |
1595 | myaddr.sin6_port = htons(port); |
1596 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
1597 | sizeof(myaddr)); |
1598 | if (port == 0) |
1599 | break; |
1600 | if (err == 0) { |
1601 | transport->srcport = port; |
1602 | break; |
1603 | } |
1604 | last = port; |
1605 | port = xs_next_srcport(transport, sock, port); |
1606 | if (port > last) |
1607 | nloop++; |
1608 | } while (err == -EADDRINUSE && nloop != 2); |
1609 | dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", |
1610 | &myaddr.sin6_addr, port, err ? "failed" : "ok", err); |
1611 | return err; |
1612 | } |
1613 | |
1614 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1615 | static struct lock_class_key xs_key[2]; |
1616 | static struct lock_class_key xs_slock_key[2]; |
1617 | |
1618 | static inline void xs_reclassify_socket4(struct socket *sock) |
1619 | { |
1620 | struct sock *sk = sock->sk; |
1621 | |
1622 | BUG_ON(sock_owned_by_user(sk)); |
1623 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1624 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); |
1625 | } |
1626 | |
1627 | static inline void xs_reclassify_socket6(struct socket *sock) |
1628 | { |
1629 | struct sock *sk = sock->sk; |
1630 | |
1631 | BUG_ON(sock_owned_by_user(sk)); |
1632 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1633 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); |
1634 | } |
1635 | #else |
1636 | static inline void xs_reclassify_socket4(struct socket *sock) |
1637 | { |
1638 | } |
1639 | |
1640 | static inline void xs_reclassify_socket6(struct socket *sock) |
1641 | { |
1642 | } |
1643 | #endif |
1644 | |
1645 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1646 | { |
1647 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1648 | |
1649 | if (!transport->inet) { |
1650 | struct sock *sk = sock->sk; |
1651 | |
1652 | write_lock_bh(&sk->sk_callback_lock); |
1653 | |
1654 | xs_save_old_callbacks(transport, sk); |
1655 | |
1656 | sk->sk_user_data = xprt; |
1657 | sk->sk_data_ready = xs_udp_data_ready; |
1658 | sk->sk_write_space = xs_udp_write_space; |
1659 | sk->sk_error_report = xs_error_report; |
1660 | sk->sk_no_check = UDP_CSUM_NORCV; |
1661 | sk->sk_allocation = GFP_ATOMIC; |
1662 | |
1663 | xprt_set_connected(xprt); |
1664 | |
1665 | /* Reset to new socket */ |
1666 | transport->sock = sock; |
1667 | transport->inet = sk; |
1668 | |
1669 | write_unlock_bh(&sk->sk_callback_lock); |
1670 | } |
1671 | xs_udp_do_set_buffer_size(xprt); |
1672 | } |
1673 | |
1674 | /** |
1675 | * xs_udp_connect_worker4 - set up a UDP socket |
1676 | * @work: RPC transport to connect |
1677 | * |
1678 | * Invoked by a work queue tasklet. |
1679 | */ |
1680 | static void xs_udp_connect_worker4(struct work_struct *work) |
1681 | { |
1682 | struct sock_xprt *transport = |
1683 | container_of(work, struct sock_xprt, connect_worker.work); |
1684 | struct rpc_xprt *xprt = &transport->xprt; |
1685 | struct socket *sock = transport->sock; |
1686 | int err, status = -EIO; |
1687 | |
1688 | if (xprt->shutdown) |
1689 | goto out; |
1690 | |
1691 | /* Start by resetting any existing state */ |
1692 | xs_reset_transport(transport); |
1693 | |
1694 | err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1695 | if (err < 0) { |
1696 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1697 | goto out; |
1698 | } |
1699 | xs_reclassify_socket4(sock); |
1700 | |
1701 | if (xs_bind4(transport, sock)) { |
1702 | sock_release(sock); |
1703 | goto out; |
1704 | } |
1705 | |
1706 | dprintk("RPC: worker connecting xprt %p via %s to " |
1707 | "%s (port %s)\n", xprt, |
1708 | xprt->address_strings[RPC_DISPLAY_PROTO], |
1709 | xprt->address_strings[RPC_DISPLAY_ADDR], |
1710 | xprt->address_strings[RPC_DISPLAY_PORT]); |
1711 | |
1712 | xs_udp_finish_connecting(xprt, sock); |
1713 | status = 0; |
1714 | out: |
1715 | xprt_clear_connecting(xprt); |
1716 | xprt_wake_pending_tasks(xprt, status); |
1717 | } |
1718 | |
1719 | /** |
1720 | * xs_udp_connect_worker6 - set up a UDP socket |
1721 | * @work: RPC transport to connect |
1722 | * |
1723 | * Invoked by a work queue tasklet. |
1724 | */ |
1725 | static void xs_udp_connect_worker6(struct work_struct *work) |
1726 | { |
1727 | struct sock_xprt *transport = |
1728 | container_of(work, struct sock_xprt, connect_worker.work); |
1729 | struct rpc_xprt *xprt = &transport->xprt; |
1730 | struct socket *sock = transport->sock; |
1731 | int err, status = -EIO; |
1732 | |
1733 | if (xprt->shutdown) |
1734 | goto out; |
1735 | |
1736 | /* Start by resetting any existing state */ |
1737 | xs_reset_transport(transport); |
1738 | |
1739 | err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1740 | if (err < 0) { |
1741 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1742 | goto out; |
1743 | } |
1744 | xs_reclassify_socket6(sock); |
1745 | |
1746 | if (xs_bind6(transport, sock) < 0) { |
1747 | sock_release(sock); |
1748 | goto out; |
1749 | } |
1750 | |
1751 | dprintk("RPC: worker connecting xprt %p via %s to " |
1752 | "%s (port %s)\n", xprt, |
1753 | xprt->address_strings[RPC_DISPLAY_PROTO], |
1754 | xprt->address_strings[RPC_DISPLAY_ADDR], |
1755 | xprt->address_strings[RPC_DISPLAY_PORT]); |
1756 | |
1757 | xs_udp_finish_connecting(xprt, sock); |
1758 | status = 0; |
1759 | out: |
1760 | xprt_clear_connecting(xprt); |
1761 | xprt_wake_pending_tasks(xprt, status); |
1762 | } |
1763 | |
1764 | /* |
1765 | * We need to preserve the port number so the reply cache on the server can |
1766 | * find our cached RPC replies when we get around to reconnecting. |
1767 | */ |
1768 | static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1769 | { |
1770 | int result; |
1771 | struct sockaddr any; |
1772 | |
1773 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
1774 | |
1775 | /* |
1776 | * Disconnect the transport socket by doing a connect operation |
1777 | * with AF_UNSPEC. This should return immediately... |
1778 | */ |
1779 | memset(&any, 0, sizeof(any)); |
1780 | any.sa_family = AF_UNSPEC; |
1781 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
1782 | if (!result) |
1783 | xs_sock_mark_closed(xprt); |
1784 | else |
1785 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
1786 | result); |
1787 | } |
1788 | |
1789 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1790 | { |
1791 | unsigned int state = transport->inet->sk_state; |
1792 | |
1793 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) |
1794 | return; |
1795 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) |
1796 | return; |
1797 | xs_abort_connection(xprt, transport); |
1798 | } |
1799 | |
1800 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1801 | { |
1802 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1803 | |
1804 | if (!transport->inet) { |
1805 | struct sock *sk = sock->sk; |
1806 | |
1807 | write_lock_bh(&sk->sk_callback_lock); |
1808 | |
1809 | xs_save_old_callbacks(transport, sk); |
1810 | |
1811 | sk->sk_user_data = xprt; |
1812 | sk->sk_data_ready = xs_tcp_data_ready; |
1813 | sk->sk_state_change = xs_tcp_state_change; |
1814 | sk->sk_write_space = xs_tcp_write_space; |
1815 | sk->sk_error_report = xs_error_report; |
1816 | sk->sk_allocation = GFP_ATOMIC; |
1817 | |
1818 | /* socket options */ |
1819 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
1820 | sock_reset_flag(sk, SOCK_LINGER); |
1821 | tcp_sk(sk)->linger2 = 0; |
1822 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1823 | |
1824 | xprt_clear_connected(xprt); |
1825 | |
1826 | /* Reset to new socket */ |
1827 | transport->sock = sock; |
1828 | transport->inet = sk; |
1829 | |
1830 | write_unlock_bh(&sk->sk_callback_lock); |
1831 | } |
1832 | |
1833 | if (!xprt_bound(xprt)) |
1834 | return -ENOTCONN; |
1835 | |
1836 | /* Tell the socket layer to start connecting... */ |
1837 | xprt->stat.connect_count++; |
1838 | xprt->stat.connect_start = jiffies; |
1839 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
1840 | } |
1841 | |
1842 | /** |
1843 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
1844 | * @xprt: RPC transport to connect |
1845 | * @transport: socket transport to connect |
1846 | * @create_sock: function to create a socket of the correct type |
1847 | * |
1848 | * Invoked by a work queue tasklet. |
1849 | */ |
1850 | static void xs_tcp_setup_socket(struct rpc_xprt *xprt, |
1851 | struct sock_xprt *transport, |
1852 | struct socket *(*create_sock)(struct rpc_xprt *, |
1853 | struct sock_xprt *)) |
1854 | { |
1855 | struct socket *sock = transport->sock; |
1856 | int status = -EIO; |
1857 | |
1858 | if (xprt->shutdown) |
1859 | goto out; |
1860 | |
1861 | if (!sock) { |
1862 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1863 | sock = create_sock(xprt, transport); |
1864 | if (IS_ERR(sock)) { |
1865 | status = PTR_ERR(sock); |
1866 | goto out; |
1867 | } |
1868 | } else { |
1869 | int abort_and_exit; |
1870 | |
1871 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
1872 | &xprt->state); |
1873 | /* "close" the socket, preserving the local port */ |
1874 | xs_tcp_reuse_connection(xprt, transport); |
1875 | |
1876 | if (abort_and_exit) |
1877 | goto out_eagain; |
1878 | } |
1879 | |
1880 | dprintk("RPC: worker connecting xprt %p via %s to " |
1881 | "%s (port %s)\n", xprt, |
1882 | xprt->address_strings[RPC_DISPLAY_PROTO], |
1883 | xprt->address_strings[RPC_DISPLAY_ADDR], |
1884 | xprt->address_strings[RPC_DISPLAY_PORT]); |
1885 | |
1886 | status = xs_tcp_finish_connecting(xprt, sock); |
1887 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1888 | xprt, -status, xprt_connected(xprt), |
1889 | sock->sk->sk_state); |
1890 | switch (status) { |
1891 | default: |
1892 | printk("%s: connect returned unhandled error %d\n", |
1893 | __func__, status); |
1894 | case -EADDRNOTAVAIL: |
1895 | /* We're probably in TIME_WAIT. Get rid of existing socket, |
1896 | * and retry |
1897 | */ |
1898 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
1899 | xprt_force_disconnect(xprt); |
1900 | break; |
1901 | case -ECONNREFUSED: |
1902 | case -ECONNRESET: |
1903 | case -ENETUNREACH: |
1904 | /* retry with existing socket, after a delay */ |
1905 | case 0: |
1906 | case -EINPROGRESS: |
1907 | case -EALREADY: |
1908 | xprt_clear_connecting(xprt); |
1909 | return; |
1910 | case -EINVAL: |
1911 | /* Happens, for instance, if the user specified a link |
1912 | * local IPv6 address without a scope-id. |
1913 | */ |
1914 | goto out; |
1915 | } |
1916 | out_eagain: |
1917 | status = -EAGAIN; |
1918 | out: |
1919 | xprt_clear_connecting(xprt); |
1920 | xprt_wake_pending_tasks(xprt, status); |
1921 | } |
1922 | |
1923 | static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, |
1924 | struct sock_xprt *transport) |
1925 | { |
1926 | struct socket *sock; |
1927 | int err; |
1928 | |
1929 | /* start from scratch */ |
1930 | err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
1931 | if (err < 0) { |
1932 | dprintk("RPC: can't create TCP transport socket (%d).\n", |
1933 | -err); |
1934 | goto out_err; |
1935 | } |
1936 | xs_reclassify_socket4(sock); |
1937 | |
1938 | if (xs_bind4(transport, sock) < 0) { |
1939 | sock_release(sock); |
1940 | goto out_err; |
1941 | } |
1942 | return sock; |
1943 | out_err: |
1944 | return ERR_PTR(-EIO); |
1945 | } |
1946 | |
1947 | /** |
1948 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
1949 | * @work: RPC transport to connect |
1950 | * |
1951 | * Invoked by a work queue tasklet. |
1952 | */ |
1953 | static void xs_tcp_connect_worker4(struct work_struct *work) |
1954 | { |
1955 | struct sock_xprt *transport = |
1956 | container_of(work, struct sock_xprt, connect_worker.work); |
1957 | struct rpc_xprt *xprt = &transport->xprt; |
1958 | |
1959 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); |
1960 | } |
1961 | |
1962 | static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, |
1963 | struct sock_xprt *transport) |
1964 | { |
1965 | struct socket *sock; |
1966 | int err; |
1967 | |
1968 | /* start from scratch */ |
1969 | err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); |
1970 | if (err < 0) { |
1971 | dprintk("RPC: can't create TCP transport socket (%d).\n", |
1972 | -err); |
1973 | goto out_err; |
1974 | } |
1975 | xs_reclassify_socket6(sock); |
1976 | |
1977 | if (xs_bind6(transport, sock) < 0) { |
1978 | sock_release(sock); |
1979 | goto out_err; |
1980 | } |
1981 | return sock; |
1982 | out_err: |
1983 | return ERR_PTR(-EIO); |
1984 | } |
1985 | |
1986 | /** |
1987 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint |
1988 | * @work: RPC transport to connect |
1989 | * |
1990 | * Invoked by a work queue tasklet. |
1991 | */ |
1992 | static void xs_tcp_connect_worker6(struct work_struct *work) |
1993 | { |
1994 | struct sock_xprt *transport = |
1995 | container_of(work, struct sock_xprt, connect_worker.work); |
1996 | struct rpc_xprt *xprt = &transport->xprt; |
1997 | |
1998 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); |
1999 | } |
2000 | |
2001 | /** |
2002 | * xs_connect - connect a socket to a remote endpoint |
2003 | * @task: address of RPC task that manages state of connect request |
2004 | * |
2005 | * TCP: If the remote end dropped the connection, delay reconnecting. |
2006 | * |
2007 | * UDP socket connects are synchronous, but we use a work queue anyway |
2008 | * to guarantee that even unprivileged user processes can set up a |
2009 | * socket on a privileged port. |
2010 | * |
2011 | * If a UDP socket connect fails, the delay behavior here prevents |
2012 | * retry floods (hard mounts). |
2013 | */ |
2014 | static void xs_connect(struct rpc_task *task) |
2015 | { |
2016 | struct rpc_xprt *xprt = task->tk_xprt; |
2017 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2018 | |
2019 | if (xprt_test_and_set_connecting(xprt)) |
2020 | return; |
2021 | |
2022 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
2023 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2024 | "seconds\n", |
2025 | xprt, xprt->reestablish_timeout / HZ); |
2026 | queue_delayed_work(rpciod_workqueue, |
2027 | &transport->connect_worker, |
2028 | xprt->reestablish_timeout); |
2029 | xprt->reestablish_timeout <<= 1; |
2030 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2031 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2032 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2033 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; |
2034 | } else { |
2035 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
2036 | queue_delayed_work(rpciod_workqueue, |
2037 | &transport->connect_worker, 0); |
2038 | } |
2039 | } |
2040 | |
2041 | static void xs_tcp_connect(struct rpc_task *task) |
2042 | { |
2043 | struct rpc_xprt *xprt = task->tk_xprt; |
2044 | |
2045 | /* Exit if we need to wait for socket shutdown to complete */ |
2046 | if (test_bit(XPRT_CLOSING, &xprt->state)) |
2047 | return; |
2048 | xs_connect(task); |
2049 | } |
2050 | |
2051 | /** |
2052 | * xs_udp_print_stats - display UDP socket-specifc stats |
2053 | * @xprt: rpc_xprt struct containing statistics |
2054 | * @seq: output file |
2055 | * |
2056 | */ |
2057 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
2058 | { |
2059 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2060 | |
2061 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
2062 | transport->srcport, |
2063 | xprt->stat.bind_count, |
2064 | xprt->stat.sends, |
2065 | xprt->stat.recvs, |
2066 | xprt->stat.bad_xids, |
2067 | xprt->stat.req_u, |
2068 | xprt->stat.bklog_u); |
2069 | } |
2070 | |
2071 | /** |
2072 | * xs_tcp_print_stats - display TCP socket-specifc stats |
2073 | * @xprt: rpc_xprt struct containing statistics |
2074 | * @seq: output file |
2075 | * |
2076 | */ |
2077 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
2078 | { |
2079 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2080 | long idle_time = 0; |
2081 | |
2082 | if (xprt_connected(xprt)) |
2083 | idle_time = (long)(jiffies - xprt->last_used) / HZ; |
2084 | |
2085 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", |
2086 | transport->srcport, |
2087 | xprt->stat.bind_count, |
2088 | xprt->stat.connect_count, |
2089 | xprt->stat.connect_time, |
2090 | idle_time, |
2091 | xprt->stat.sends, |
2092 | xprt->stat.recvs, |
2093 | xprt->stat.bad_xids, |
2094 | xprt->stat.req_u, |
2095 | xprt->stat.bklog_u); |
2096 | } |
2097 | |
2098 | /* |
2099 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason |
2100 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want |
2101 | * to use the server side send routines. |
2102 | */ |
2103 | static void *bc_malloc(struct rpc_task *task, size_t size) |
2104 | { |
2105 | struct page *page; |
2106 | struct rpc_buffer *buf; |
2107 | |
2108 | BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); |
2109 | page = alloc_page(GFP_KERNEL); |
2110 | |
2111 | if (!page) |
2112 | return NULL; |
2113 | |
2114 | buf = page_address(page); |
2115 | buf->len = PAGE_SIZE; |
2116 | |
2117 | return buf->data; |
2118 | } |
2119 | |
2120 | /* |
2121 | * Free the space allocated in the bc_alloc routine |
2122 | */ |
2123 | static void bc_free(void *buffer) |
2124 | { |
2125 | struct rpc_buffer *buf; |
2126 | |
2127 | if (!buffer) |
2128 | return; |
2129 | |
2130 | buf = container_of(buffer, struct rpc_buffer, data); |
2131 | free_page((unsigned long)buf); |
2132 | } |
2133 | |
2134 | /* |
2135 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex |
2136 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. |
2137 | */ |
2138 | static int bc_sendto(struct rpc_rqst *req) |
2139 | { |
2140 | int len; |
2141 | struct xdr_buf *xbufp = &req->rq_snd_buf; |
2142 | struct rpc_xprt *xprt = req->rq_xprt; |
2143 | struct sock_xprt *transport = |
2144 | container_of(xprt, struct sock_xprt, xprt); |
2145 | struct socket *sock = transport->sock; |
2146 | unsigned long headoff; |
2147 | unsigned long tailoff; |
2148 | |
2149 | /* |
2150 | * Set up the rpc header and record marker stuff |
2151 | */ |
2152 | xs_encode_tcp_record_marker(xbufp); |
2153 | |
2154 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; |
2155 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; |
2156 | len = svc_send_common(sock, xbufp, |
2157 | virt_to_page(xbufp->head[0].iov_base), headoff, |
2158 | xbufp->tail[0].iov_base, tailoff); |
2159 | |
2160 | if (len != xbufp->len) { |
2161 | printk(KERN_NOTICE "Error sending entire callback!\n"); |
2162 | len = -EAGAIN; |
2163 | } |
2164 | |
2165 | return len; |
2166 | } |
2167 | |
2168 | /* |
2169 | * The send routine. Borrows from svc_send |
2170 | */ |
2171 | static int bc_send_request(struct rpc_task *task) |
2172 | { |
2173 | struct rpc_rqst *req = task->tk_rqstp; |
2174 | struct svc_xprt *xprt; |
2175 | struct svc_sock *svsk; |
2176 | u32 len; |
2177 | |
2178 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); |
2179 | /* |
2180 | * Get the server socket associated with this callback xprt |
2181 | */ |
2182 | xprt = req->rq_xprt->bc_xprt; |
2183 | svsk = container_of(xprt, struct svc_sock, sk_xprt); |
2184 | |
2185 | /* |
2186 | * Grab the mutex to serialize data as the connection is shared |
2187 | * with the fore channel |
2188 | */ |
2189 | if (!mutex_trylock(&xprt->xpt_mutex)) { |
2190 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); |
2191 | if (!mutex_trylock(&xprt->xpt_mutex)) |
2192 | return -EAGAIN; |
2193 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); |
2194 | } |
2195 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) |
2196 | len = -ENOTCONN; |
2197 | else |
2198 | len = bc_sendto(req); |
2199 | mutex_unlock(&xprt->xpt_mutex); |
2200 | |
2201 | if (len > 0) |
2202 | len = 0; |
2203 | |
2204 | return len; |
2205 | } |
2206 | |
2207 | /* |
2208 | * The close routine. Since this is client initiated, we do nothing |
2209 | */ |
2210 | |
2211 | static void bc_close(struct rpc_xprt *xprt) |
2212 | { |
2213 | return; |
2214 | } |
2215 | |
2216 | /* |
2217 | * The xprt destroy routine. Again, because this connection is client |
2218 | * initiated, we do nothing |
2219 | */ |
2220 | |
2221 | static void bc_destroy(struct rpc_xprt *xprt) |
2222 | { |
2223 | return; |
2224 | } |
2225 | |
2226 | static struct rpc_xprt_ops xs_udp_ops = { |
2227 | .set_buffer_size = xs_udp_set_buffer_size, |
2228 | .reserve_xprt = xprt_reserve_xprt_cong, |
2229 | .release_xprt = xprt_release_xprt_cong, |
2230 | .rpcbind = rpcb_getport_async, |
2231 | .set_port = xs_set_port, |
2232 | .connect = xs_connect, |
2233 | .buf_alloc = rpc_malloc, |
2234 | .buf_free = rpc_free, |
2235 | .send_request = xs_udp_send_request, |
2236 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
2237 | .timer = xs_udp_timer, |
2238 | .release_request = xprt_release_rqst_cong, |
2239 | .close = xs_close, |
2240 | .destroy = xs_destroy, |
2241 | .print_stats = xs_udp_print_stats, |
2242 | }; |
2243 | |
2244 | static struct rpc_xprt_ops xs_tcp_ops = { |
2245 | .reserve_xprt = xprt_reserve_xprt, |
2246 | .release_xprt = xs_tcp_release_xprt, |
2247 | .rpcbind = rpcb_getport_async, |
2248 | .set_port = xs_set_port, |
2249 | .connect = xs_tcp_connect, |
2250 | .buf_alloc = rpc_malloc, |
2251 | .buf_free = rpc_free, |
2252 | .send_request = xs_tcp_send_request, |
2253 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
2254 | .close = xs_tcp_close, |
2255 | .destroy = xs_destroy, |
2256 | .print_stats = xs_tcp_print_stats, |
2257 | }; |
2258 | |
2259 | /* |
2260 | * The rpc_xprt_ops for the server backchannel |
2261 | */ |
2262 | |
2263 | static struct rpc_xprt_ops bc_tcp_ops = { |
2264 | .reserve_xprt = xprt_reserve_xprt, |
2265 | .release_xprt = xprt_release_xprt, |
2266 | .buf_alloc = bc_malloc, |
2267 | .buf_free = bc_free, |
2268 | .send_request = bc_send_request, |
2269 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
2270 | .close = bc_close, |
2271 | .destroy = bc_destroy, |
2272 | .print_stats = xs_tcp_print_stats, |
2273 | }; |
2274 | |
2275 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
2276 | unsigned int slot_table_size) |
2277 | { |
2278 | struct rpc_xprt *xprt; |
2279 | struct sock_xprt *new; |
2280 | |
2281 | if (args->addrlen > sizeof(xprt->addr)) { |
2282 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
2283 | return ERR_PTR(-EBADF); |
2284 | } |
2285 | |
2286 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
2287 | if (new == NULL) { |
2288 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2289 | "rpc_xprt\n"); |
2290 | return ERR_PTR(-ENOMEM); |
2291 | } |
2292 | xprt = &new->xprt; |
2293 | |
2294 | xprt->max_reqs = slot_table_size; |
2295 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); |
2296 | if (xprt->slot == NULL) { |
2297 | kfree(xprt); |
2298 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
2299 | "table\n"); |
2300 | return ERR_PTR(-ENOMEM); |
2301 | } |
2302 | |
2303 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2304 | xprt->addrlen = args->addrlen; |
2305 | if (args->srcaddr) |
2306 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
2307 | |
2308 | return xprt; |
2309 | } |
2310 | |
2311 | static const struct rpc_timeout xs_udp_default_timeout = { |
2312 | .to_initval = 5 * HZ, |
2313 | .to_maxval = 30 * HZ, |
2314 | .to_increment = 5 * HZ, |
2315 | .to_retries = 5, |
2316 | }; |
2317 | |
2318 | /** |
2319 | * xs_setup_udp - Set up transport to use a UDP socket |
2320 | * @args: rpc transport creation arguments |
2321 | * |
2322 | */ |
2323 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
2324 | { |
2325 | struct sockaddr *addr = args->dstaddr; |
2326 | struct rpc_xprt *xprt; |
2327 | struct sock_xprt *transport; |
2328 | |
2329 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
2330 | if (IS_ERR(xprt)) |
2331 | return xprt; |
2332 | transport = container_of(xprt, struct sock_xprt, xprt); |
2333 | |
2334 | xprt->prot = IPPROTO_UDP; |
2335 | xprt->tsh_size = 0; |
2336 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2337 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); |
2338 | |
2339 | xprt->bind_timeout = XS_BIND_TO; |
2340 | xprt->connect_timeout = XS_UDP_CONN_TO; |
2341 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2342 | xprt->idle_timeout = XS_IDLE_DISC_TO; |
2343 | |
2344 | xprt->ops = &xs_udp_ops; |
2345 | |
2346 | xprt->timeout = &xs_udp_default_timeout; |
2347 | |
2348 | switch (addr->sa_family) { |
2349 | case AF_INET: |
2350 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) |
2351 | xprt_set_bound(xprt); |
2352 | |
2353 | INIT_DELAYED_WORK(&transport->connect_worker, |
2354 | xs_udp_connect_worker4); |
2355 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
2356 | break; |
2357 | case AF_INET6: |
2358 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) |
2359 | xprt_set_bound(xprt); |
2360 | |
2361 | INIT_DELAYED_WORK(&transport->connect_worker, |
2362 | xs_udp_connect_worker6); |
2363 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
2364 | break; |
2365 | default: |
2366 | kfree(xprt); |
2367 | return ERR_PTR(-EAFNOSUPPORT); |
2368 | } |
2369 | |
2370 | if (xprt_bound(xprt)) |
2371 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2372 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2373 | xprt->address_strings[RPC_DISPLAY_PORT], |
2374 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2375 | else |
2376 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", |
2377 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2378 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2379 | |
2380 | if (try_module_get(THIS_MODULE)) |
2381 | return xprt; |
2382 | |
2383 | kfree(xprt->slot); |
2384 | kfree(xprt); |
2385 | return ERR_PTR(-EINVAL); |
2386 | } |
2387 | |
2388 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2389 | .to_initval = 60 * HZ, |
2390 | .to_maxval = 60 * HZ, |
2391 | .to_retries = 2, |
2392 | }; |
2393 | |
2394 | /** |
2395 | * xs_setup_tcp - Set up transport to use a TCP socket |
2396 | * @args: rpc transport creation arguments |
2397 | * |
2398 | */ |
2399 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
2400 | { |
2401 | struct sockaddr *addr = args->dstaddr; |
2402 | struct rpc_xprt *xprt; |
2403 | struct sock_xprt *transport; |
2404 | |
2405 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
2406 | if (IS_ERR(xprt)) |
2407 | return xprt; |
2408 | transport = container_of(xprt, struct sock_xprt, xprt); |
2409 | |
2410 | xprt->prot = IPPROTO_TCP; |
2411 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
2412 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
2413 | |
2414 | xprt->bind_timeout = XS_BIND_TO; |
2415 | xprt->connect_timeout = XS_TCP_CONN_TO; |
2416 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2417 | xprt->idle_timeout = XS_IDLE_DISC_TO; |
2418 | |
2419 | xprt->ops = &xs_tcp_ops; |
2420 | xprt->timeout = &xs_tcp_default_timeout; |
2421 | |
2422 | switch (addr->sa_family) { |
2423 | case AF_INET: |
2424 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) |
2425 | xprt_set_bound(xprt); |
2426 | |
2427 | INIT_DELAYED_WORK(&transport->connect_worker, |
2428 | xs_tcp_connect_worker4); |
2429 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
2430 | break; |
2431 | case AF_INET6: |
2432 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) |
2433 | xprt_set_bound(xprt); |
2434 | |
2435 | INIT_DELAYED_WORK(&transport->connect_worker, |
2436 | xs_tcp_connect_worker6); |
2437 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
2438 | break; |
2439 | default: |
2440 | kfree(xprt); |
2441 | return ERR_PTR(-EAFNOSUPPORT); |
2442 | } |
2443 | |
2444 | if (xprt_bound(xprt)) |
2445 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2446 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2447 | xprt->address_strings[RPC_DISPLAY_PORT], |
2448 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2449 | else |
2450 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", |
2451 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2452 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2453 | |
2454 | |
2455 | if (try_module_get(THIS_MODULE)) |
2456 | return xprt; |
2457 | |
2458 | kfree(xprt->slot); |
2459 | kfree(xprt); |
2460 | return ERR_PTR(-EINVAL); |
2461 | } |
2462 | |
2463 | /** |
2464 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket |
2465 | * @args: rpc transport creation arguments |
2466 | * |
2467 | */ |
2468 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) |
2469 | { |
2470 | struct sockaddr *addr = args->dstaddr; |
2471 | struct rpc_xprt *xprt; |
2472 | struct sock_xprt *transport; |
2473 | struct svc_sock *bc_sock; |
2474 | |
2475 | if (!args->bc_xprt) |
2476 | ERR_PTR(-EINVAL); |
2477 | |
2478 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
2479 | if (IS_ERR(xprt)) |
2480 | return xprt; |
2481 | transport = container_of(xprt, struct sock_xprt, xprt); |
2482 | |
2483 | xprt->prot = IPPROTO_TCP; |
2484 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
2485 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
2486 | xprt->timeout = &xs_tcp_default_timeout; |
2487 | |
2488 | /* backchannel */ |
2489 | xprt_set_bound(xprt); |
2490 | xprt->bind_timeout = 0; |
2491 | xprt->connect_timeout = 0; |
2492 | xprt->reestablish_timeout = 0; |
2493 | xprt->idle_timeout = 0; |
2494 | |
2495 | /* |
2496 | * The backchannel uses the same socket connection as the |
2497 | * forechannel |
2498 | */ |
2499 | xprt->bc_xprt = args->bc_xprt; |
2500 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); |
2501 | bc_sock->sk_bc_xprt = xprt; |
2502 | transport->sock = bc_sock->sk_sock; |
2503 | transport->inet = bc_sock->sk_sk; |
2504 | |
2505 | xprt->ops = &bc_tcp_ops; |
2506 | |
2507 | switch (addr->sa_family) { |
2508 | case AF_INET: |
2509 | xs_format_peer_addresses(xprt, "tcp", |
2510 | RPCBIND_NETID_TCP); |
2511 | break; |
2512 | case AF_INET6: |
2513 | xs_format_peer_addresses(xprt, "tcp", |
2514 | RPCBIND_NETID_TCP6); |
2515 | break; |
2516 | default: |
2517 | kfree(xprt); |
2518 | return ERR_PTR(-EAFNOSUPPORT); |
2519 | } |
2520 | |
2521 | if (xprt_bound(xprt)) |
2522 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2523 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2524 | xprt->address_strings[RPC_DISPLAY_PORT], |
2525 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2526 | else |
2527 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", |
2528 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2529 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2530 | |
2531 | /* |
2532 | * Since we don't want connections for the backchannel, we set |
2533 | * the xprt status to connected |
2534 | */ |
2535 | xprt_set_connected(xprt); |
2536 | |
2537 | |
2538 | if (try_module_get(THIS_MODULE)) |
2539 | return xprt; |
2540 | kfree(xprt->slot); |
2541 | kfree(xprt); |
2542 | return ERR_PTR(-EINVAL); |
2543 | } |
2544 | |
2545 | static struct xprt_class xs_udp_transport = { |
2546 | .list = LIST_HEAD_INIT(xs_udp_transport.list), |
2547 | .name = "udp", |
2548 | .owner = THIS_MODULE, |
2549 | .ident = XPRT_TRANSPORT_UDP, |
2550 | .setup = xs_setup_udp, |
2551 | }; |
2552 | |
2553 | static struct xprt_class xs_tcp_transport = { |
2554 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), |
2555 | .name = "tcp", |
2556 | .owner = THIS_MODULE, |
2557 | .ident = XPRT_TRANSPORT_TCP, |
2558 | .setup = xs_setup_tcp, |
2559 | }; |
2560 | |
2561 | static struct xprt_class xs_bc_tcp_transport = { |
2562 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), |
2563 | .name = "tcp NFSv4.1 backchannel", |
2564 | .owner = THIS_MODULE, |
2565 | .ident = XPRT_TRANSPORT_BC_TCP, |
2566 | .setup = xs_setup_bc_tcp, |
2567 | }; |
2568 | |
2569 | /** |
2570 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
2571 | * |
2572 | */ |
2573 | int init_socket_xprt(void) |
2574 | { |
2575 | #ifdef RPC_DEBUG |
2576 | if (!sunrpc_table_header) |
2577 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
2578 | #endif |
2579 | |
2580 | xprt_register_transport(&xs_udp_transport); |
2581 | xprt_register_transport(&xs_tcp_transport); |
2582 | xprt_register_transport(&xs_bc_tcp_transport); |
2583 | |
2584 | return 0; |
2585 | } |
2586 | |
2587 | /** |
2588 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
2589 | * |
2590 | */ |
2591 | void cleanup_socket_xprt(void) |
2592 | { |
2593 | #ifdef RPC_DEBUG |
2594 | if (sunrpc_table_header) { |
2595 | unregister_sysctl_table(sunrpc_table_header); |
2596 | sunrpc_table_header = NULL; |
2597 | } |
2598 | #endif |
2599 | |
2600 | xprt_unregister_transport(&xs_udp_transport); |
2601 | xprt_unregister_transport(&xs_tcp_transport); |
2602 | xprt_unregister_transport(&xs_bc_tcp_transport); |
2603 | } |
2604 | |
2605 | static int param_set_uint_minmax(const char *val, struct kernel_param *kp, |
2606 | unsigned int min, unsigned int max) |
2607 | { |
2608 | unsigned long num; |
2609 | int ret; |
2610 | |
2611 | if (!val) |
2612 | return -EINVAL; |
2613 | ret = strict_strtoul(val, 0, &num); |
2614 | if (ret == -EINVAL || num < min || num > max) |
2615 | return -EINVAL; |
2616 | *((unsigned int *)kp->arg) = num; |
2617 | return 0; |
2618 | } |
2619 | |
2620 | static int param_set_portnr(const char *val, struct kernel_param *kp) |
2621 | { |
2622 | return param_set_uint_minmax(val, kp, |
2623 | RPC_MIN_RESVPORT, |
2624 | RPC_MAX_RESVPORT); |
2625 | } |
2626 | |
2627 | static int param_get_portnr(char *buffer, struct kernel_param *kp) |
2628 | { |
2629 | return param_get_uint(buffer, kp); |
2630 | } |
2631 | #define param_check_portnr(name, p) \ |
2632 | __param_check(name, p, unsigned int); |
2633 | |
2634 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); |
2635 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); |
2636 | |
2637 | static int param_set_slot_table_size(const char *val, struct kernel_param *kp) |
2638 | { |
2639 | return param_set_uint_minmax(val, kp, |
2640 | RPC_MIN_SLOT_TABLE, |
2641 | RPC_MAX_SLOT_TABLE); |
2642 | } |
2643 | |
2644 | static int param_get_slot_table_size(char *buffer, struct kernel_param *kp) |
2645 | { |
2646 | return param_get_uint(buffer, kp); |
2647 | } |
2648 | #define param_check_slot_table_size(name, p) \ |
2649 | __param_check(name, p, unsigned int); |
2650 | |
2651 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
2652 | slot_table_size, 0644); |
2653 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
2654 | slot_table_size, 0644); |
2655 | |
2656 |
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