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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 | .ctl_name = CTL_SLOTTABLE_UDP, |
85 | .procname = "udp_slot_table_entries", |
86 | .data = &xprt_udp_slot_table_entries, |
87 | .maxlen = sizeof(unsigned int), |
88 | .mode = 0644, |
89 | .proc_handler = &proc_dointvec_minmax, |
90 | .strategy = &sysctl_intvec, |
91 | .extra1 = &min_slot_table_size, |
92 | .extra2 = &max_slot_table_size |
93 | }, |
94 | { |
95 | .ctl_name = CTL_SLOTTABLE_TCP, |
96 | .procname = "tcp_slot_table_entries", |
97 | .data = &xprt_tcp_slot_table_entries, |
98 | .maxlen = sizeof(unsigned int), |
99 | .mode = 0644, |
100 | .proc_handler = &proc_dointvec_minmax, |
101 | .strategy = &sysctl_intvec, |
102 | .extra1 = &min_slot_table_size, |
103 | .extra2 = &max_slot_table_size |
104 | }, |
105 | { |
106 | .ctl_name = CTL_MIN_RESVPORT, |
107 | .procname = "min_resvport", |
108 | .data = &xprt_min_resvport, |
109 | .maxlen = sizeof(unsigned int), |
110 | .mode = 0644, |
111 | .proc_handler = &proc_dointvec_minmax, |
112 | .strategy = &sysctl_intvec, |
113 | .extra1 = &xprt_min_resvport_limit, |
114 | .extra2 = &xprt_max_resvport_limit |
115 | }, |
116 | { |
117 | .ctl_name = CTL_MAX_RESVPORT, |
118 | .procname = "max_resvport", |
119 | .data = &xprt_max_resvport, |
120 | .maxlen = sizeof(unsigned int), |
121 | .mode = 0644, |
122 | .proc_handler = &proc_dointvec_minmax, |
123 | .strategy = &sysctl_intvec, |
124 | .extra1 = &xprt_min_resvport_limit, |
125 | .extra2 = &xprt_max_resvport_limit |
126 | }, |
127 | { |
128 | .procname = "tcp_fin_timeout", |
129 | .data = &xs_tcp_fin_timeout, |
130 | .maxlen = sizeof(xs_tcp_fin_timeout), |
131 | .mode = 0644, |
132 | .proc_handler = &proc_dointvec_jiffies, |
133 | .strategy = sysctl_jiffies |
134 | }, |
135 | { |
136 | .ctl_name = 0, |
137 | }, |
138 | }; |
139 | |
140 | static ctl_table sunrpc_table[] = { |
141 | { |
142 | .ctl_name = CTL_SUNRPC, |
143 | .procname = "sunrpc", |
144 | .mode = 0555, |
145 | .child = xs_tunables_table |
146 | }, |
147 | { |
148 | .ctl_name = 0, |
149 | }, |
150 | }; |
151 | |
152 | #endif |
153 | |
154 | /* |
155 | * Time out for an RPC UDP socket connect. UDP socket connects are |
156 | * synchronous, but we set a timeout anyway in case of resource |
157 | * exhaustion on the local host. |
158 | */ |
159 | #define XS_UDP_CONN_TO (5U * HZ) |
160 | |
161 | /* |
162 | * Wait duration for an RPC TCP connection to be established. Solaris |
163 | * NFS over TCP uses 60 seconds, for example, which is in line with how |
164 | * long a server takes to reboot. |
165 | */ |
166 | #define XS_TCP_CONN_TO (60U * HZ) |
167 | |
168 | /* |
169 | * Wait duration for a reply from the RPC portmapper. |
170 | */ |
171 | #define XS_BIND_TO (60U * HZ) |
172 | |
173 | /* |
174 | * Delay if a UDP socket connect error occurs. This is most likely some |
175 | * kind of resource problem on the local host. |
176 | */ |
177 | #define XS_UDP_REEST_TO (2U * HZ) |
178 | |
179 | /* |
180 | * The reestablish timeout allows clients to delay for a bit before attempting |
181 | * to reconnect to a server that just dropped our connection. |
182 | * |
183 | * We implement an exponential backoff when trying to reestablish a TCP |
184 | * transport connection with the server. Some servers like to drop a TCP |
185 | * connection when they are overworked, so we start with a short timeout and |
186 | * increase over time if the server is down or not responding. |
187 | */ |
188 | #define XS_TCP_INIT_REEST_TO (3U * HZ) |
189 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) |
190 | |
191 | /* |
192 | * TCP idle timeout; client drops the transport socket if it is idle |
193 | * for this long. Note that we also timeout UDP sockets to prevent |
194 | * holding port numbers when there is no RPC traffic. |
195 | */ |
196 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) |
197 | |
198 | #ifdef RPC_DEBUG |
199 | # undef RPC_DEBUG_DATA |
200 | # define RPCDBG_FACILITY RPCDBG_TRANS |
201 | #endif |
202 | |
203 | #ifdef RPC_DEBUG_DATA |
204 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
205 | { |
206 | u8 *buf = (u8 *) packet; |
207 | int j; |
208 | |
209 | dprintk("RPC: %s\n", msg); |
210 | for (j = 0; j < count && j < 128; j += 4) { |
211 | if (!(j & 31)) { |
212 | if (j) |
213 | dprintk("\n"); |
214 | dprintk("0x%04x ", j); |
215 | } |
216 | dprintk("%02x%02x%02x%02x ", |
217 | buf[j], buf[j+1], buf[j+2], buf[j+3]); |
218 | } |
219 | dprintk("\n"); |
220 | } |
221 | #else |
222 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
223 | { |
224 | /* NOP */ |
225 | } |
226 | #endif |
227 | |
228 | struct sock_xprt { |
229 | struct rpc_xprt xprt; |
230 | |
231 | /* |
232 | * Network layer |
233 | */ |
234 | struct socket * sock; |
235 | struct sock * inet; |
236 | |
237 | /* |
238 | * State of TCP reply receive |
239 | */ |
240 | __be32 tcp_fraghdr, |
241 | tcp_xid; |
242 | |
243 | u32 tcp_offset, |
244 | tcp_reclen; |
245 | |
246 | unsigned long tcp_copied, |
247 | tcp_flags; |
248 | |
249 | /* |
250 | * Connection of transports |
251 | */ |
252 | struct delayed_work connect_worker; |
253 | struct sockaddr_storage srcaddr; |
254 | unsigned short srcport; |
255 | |
256 | /* |
257 | * UDP socket buffer size parameters |
258 | */ |
259 | size_t rcvsize, |
260 | sndsize; |
261 | |
262 | /* |
263 | * Saved socket callback addresses |
264 | */ |
265 | void (*old_data_ready)(struct sock *, int); |
266 | void (*old_state_change)(struct sock *); |
267 | void (*old_write_space)(struct sock *); |
268 | void (*old_error_report)(struct sock *); |
269 | }; |
270 | |
271 | /* |
272 | * TCP receive state flags |
273 | */ |
274 | #define TCP_RCV_LAST_FRAG (1UL << 0) |
275 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) |
276 | #define TCP_RCV_COPY_XID (1UL << 2) |
277 | #define TCP_RCV_COPY_DATA (1UL << 3) |
278 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
279 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) |
280 | |
281 | /* |
282 | * TCP RPC flags |
283 | */ |
284 | #define TCP_RPC_REPLY (1UL << 6) |
285 | |
286 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
287 | { |
288 | return (struct sockaddr *) &xprt->addr; |
289 | } |
290 | |
291 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
292 | { |
293 | return (struct sockaddr_in *) &xprt->addr; |
294 | } |
295 | |
296 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) |
297 | { |
298 | return (struct sockaddr_in6 *) &xprt->addr; |
299 | } |
300 | |
301 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
302 | { |
303 | struct sockaddr *sap = xs_addr(xprt); |
304 | struct sockaddr_in6 *sin6; |
305 | struct sockaddr_in *sin; |
306 | char buf[128]; |
307 | |
308 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
309 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); |
310 | |
311 | switch (sap->sa_family) { |
312 | case AF_INET: |
313 | sin = xs_addr_in(xprt); |
314 | (void)snprintf(buf, sizeof(buf), "%02x%02x%02x%02x", |
315 | NIPQUAD(sin->sin_addr.s_addr)); |
316 | break; |
317 | case AF_INET6: |
318 | sin6 = xs_addr_in6(xprt); |
319 | (void)snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
320 | break; |
321 | default: |
322 | BUG(); |
323 | } |
324 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
325 | } |
326 | |
327 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
328 | { |
329 | struct sockaddr *sap = xs_addr(xprt); |
330 | char buf[128]; |
331 | |
332 | (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
333 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
334 | |
335 | (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
336 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
337 | } |
338 | |
339 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
340 | const char *protocol, |
341 | const char *netid) |
342 | { |
343 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
344 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
345 | xs_format_common_peer_addresses(xprt); |
346 | xs_format_common_peer_ports(xprt); |
347 | } |
348 | |
349 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
350 | { |
351 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
352 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); |
353 | |
354 | xs_format_common_peer_ports(xprt); |
355 | } |
356 | |
357 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) |
358 | { |
359 | unsigned int i; |
360 | |
361 | for (i = 0; i < RPC_DISPLAY_MAX; i++) |
362 | switch (i) { |
363 | case RPC_DISPLAY_PROTO: |
364 | case RPC_DISPLAY_NETID: |
365 | continue; |
366 | default: |
367 | kfree(xprt->address_strings[i]); |
368 | } |
369 | } |
370 | |
371 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
372 | |
373 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
374 | { |
375 | struct msghdr msg = { |
376 | .msg_name = addr, |
377 | .msg_namelen = addrlen, |
378 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
379 | }; |
380 | struct kvec iov = { |
381 | .iov_base = vec->iov_base + base, |
382 | .iov_len = vec->iov_len - base, |
383 | }; |
384 | |
385 | if (iov.iov_len != 0) |
386 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
387 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); |
388 | } |
389 | |
390 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
391 | { |
392 | struct page **ppage; |
393 | unsigned int remainder; |
394 | int err, sent = 0; |
395 | |
396 | remainder = xdr->page_len - base; |
397 | base += xdr->page_base; |
398 | ppage = xdr->pages + (base >> PAGE_SHIFT); |
399 | base &= ~PAGE_MASK; |
400 | for(;;) { |
401 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); |
402 | int flags = XS_SENDMSG_FLAGS; |
403 | |
404 | remainder -= len; |
405 | if (remainder != 0 || more) |
406 | flags |= MSG_MORE; |
407 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); |
408 | if (remainder == 0 || err != len) |
409 | break; |
410 | sent += err; |
411 | ppage++; |
412 | base = 0; |
413 | } |
414 | if (sent == 0) |
415 | return err; |
416 | if (err > 0) |
417 | sent += err; |
418 | return sent; |
419 | } |
420 | |
421 | /** |
422 | * xs_sendpages - write pages directly to a socket |
423 | * @sock: socket to send on |
424 | * @addr: UDP only -- address of destination |
425 | * @addrlen: UDP only -- length of destination address |
426 | * @xdr: buffer containing this request |
427 | * @base: starting position in the buffer |
428 | * |
429 | */ |
430 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
431 | { |
432 | unsigned int remainder = xdr->len - base; |
433 | int err, sent = 0; |
434 | |
435 | if (unlikely(!sock)) |
436 | return -ENOTSOCK; |
437 | |
438 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); |
439 | if (base != 0) { |
440 | addr = NULL; |
441 | addrlen = 0; |
442 | } |
443 | |
444 | if (base < xdr->head[0].iov_len || addr != NULL) { |
445 | unsigned int len = xdr->head[0].iov_len - base; |
446 | remainder -= len; |
447 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); |
448 | if (remainder == 0 || err != len) |
449 | goto out; |
450 | sent += err; |
451 | base = 0; |
452 | } else |
453 | base -= xdr->head[0].iov_len; |
454 | |
455 | if (base < xdr->page_len) { |
456 | unsigned int len = xdr->page_len - base; |
457 | remainder -= len; |
458 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); |
459 | if (remainder == 0 || err != len) |
460 | goto out; |
461 | sent += err; |
462 | base = 0; |
463 | } else |
464 | base -= xdr->page_len; |
465 | |
466 | if (base >= xdr->tail[0].iov_len) |
467 | return sent; |
468 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); |
469 | out: |
470 | if (sent == 0) |
471 | return err; |
472 | if (err > 0) |
473 | sent += err; |
474 | return sent; |
475 | } |
476 | |
477 | static void xs_nospace_callback(struct rpc_task *task) |
478 | { |
479 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); |
480 | |
481 | transport->inet->sk_write_pending--; |
482 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
483 | } |
484 | |
485 | /** |
486 | * xs_nospace - place task on wait queue if transmit was incomplete |
487 | * @task: task to put to sleep |
488 | * |
489 | */ |
490 | static int xs_nospace(struct rpc_task *task) |
491 | { |
492 | struct rpc_rqst *req = task->tk_rqstp; |
493 | struct rpc_xprt *xprt = req->rq_xprt; |
494 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
495 | int ret = 0; |
496 | |
497 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
498 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
499 | req->rq_slen); |
500 | |
501 | /* Protect against races with write_space */ |
502 | spin_lock_bh(&xprt->transport_lock); |
503 | |
504 | /* Don't race with disconnect */ |
505 | if (xprt_connected(xprt)) { |
506 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { |
507 | ret = -EAGAIN; |
508 | /* |
509 | * Notify TCP that we're limited by the application |
510 | * window size |
511 | */ |
512 | set_bit(SOCK_NOSPACE, &transport->sock->flags); |
513 | transport->inet->sk_write_pending++; |
514 | /* ...and wait for more buffer space */ |
515 | xprt_wait_for_buffer_space(task, xs_nospace_callback); |
516 | } |
517 | } else { |
518 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
519 | ret = -ENOTCONN; |
520 | } |
521 | |
522 | spin_unlock_bh(&xprt->transport_lock); |
523 | return ret; |
524 | } |
525 | |
526 | /** |
527 | * xs_udp_send_request - write an RPC request to a UDP socket |
528 | * @task: address of RPC task that manages the state of an RPC request |
529 | * |
530 | * Return values: |
531 | * 0: The request has been sent |
532 | * EAGAIN: The socket was blocked, please call again later to |
533 | * complete the request |
534 | * ENOTCONN: Caller needs to invoke connect logic then call again |
535 | * other: Some other error occured, the request was not sent |
536 | */ |
537 | static int xs_udp_send_request(struct rpc_task *task) |
538 | { |
539 | struct rpc_rqst *req = task->tk_rqstp; |
540 | struct rpc_xprt *xprt = req->rq_xprt; |
541 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
542 | struct xdr_buf *xdr = &req->rq_snd_buf; |
543 | int status; |
544 | |
545 | xs_pktdump("packet data:", |
546 | req->rq_svec->iov_base, |
547 | req->rq_svec->iov_len); |
548 | |
549 | if (!xprt_bound(xprt)) |
550 | return -ENOTCONN; |
551 | status = xs_sendpages(transport->sock, |
552 | xs_addr(xprt), |
553 | xprt->addrlen, xdr, |
554 | req->rq_bytes_sent); |
555 | |
556 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
557 | xdr->len - req->rq_bytes_sent, status); |
558 | |
559 | if (status >= 0) { |
560 | task->tk_bytes_sent += status; |
561 | if (status >= req->rq_slen) |
562 | return 0; |
563 | /* Still some bytes left; set up for a retry later. */ |
564 | status = -EAGAIN; |
565 | } |
566 | if (!transport->sock) |
567 | goto out; |
568 | |
569 | switch (status) { |
570 | case -ENOTSOCK: |
571 | status = -ENOTCONN; |
572 | /* Should we call xs_close() here? */ |
573 | break; |
574 | case -EAGAIN: |
575 | status = xs_nospace(task); |
576 | break; |
577 | default: |
578 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
579 | -status); |
580 | case -ENETUNREACH: |
581 | case -EPIPE: |
582 | case -ECONNREFUSED: |
583 | /* When the server has died, an ICMP port unreachable message |
584 | * prompts ECONNREFUSED. */ |
585 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
586 | } |
587 | out: |
588 | return status; |
589 | } |
590 | |
591 | /** |
592 | * xs_tcp_shutdown - gracefully shut down a TCP socket |
593 | * @xprt: transport |
594 | * |
595 | * Initiates a graceful shutdown of the TCP socket by calling the |
596 | * equivalent of shutdown(SHUT_WR); |
597 | */ |
598 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) |
599 | { |
600 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
601 | struct socket *sock = transport->sock; |
602 | |
603 | if (sock != NULL) |
604 | kernel_sock_shutdown(sock, SHUT_WR); |
605 | } |
606 | |
607 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
608 | { |
609 | u32 reclen = buf->len - sizeof(rpc_fraghdr); |
610 | rpc_fraghdr *base = buf->head[0].iov_base; |
611 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); |
612 | } |
613 | |
614 | /** |
615 | * xs_tcp_send_request - write an RPC request to a TCP socket |
616 | * @task: address of RPC task that manages the state of an RPC request |
617 | * |
618 | * Return values: |
619 | * 0: The request has been sent |
620 | * EAGAIN: The socket was blocked, please call again later to |
621 | * complete the request |
622 | * ENOTCONN: Caller needs to invoke connect logic then call again |
623 | * other: Some other error occured, the request was not sent |
624 | * |
625 | * XXX: In the case of soft timeouts, should we eventually give up |
626 | * if sendmsg is not able to make progress? |
627 | */ |
628 | static int xs_tcp_send_request(struct rpc_task *task) |
629 | { |
630 | struct rpc_rqst *req = task->tk_rqstp; |
631 | struct rpc_xprt *xprt = req->rq_xprt; |
632 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
633 | struct xdr_buf *xdr = &req->rq_snd_buf; |
634 | int status; |
635 | |
636 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
637 | |
638 | xs_pktdump("packet data:", |
639 | req->rq_svec->iov_base, |
640 | req->rq_svec->iov_len); |
641 | |
642 | /* Continue transmitting the packet/record. We must be careful |
643 | * to cope with writespace callbacks arriving _after_ we have |
644 | * called sendmsg(). */ |
645 | while (1) { |
646 | status = xs_sendpages(transport->sock, |
647 | NULL, 0, xdr, req->rq_bytes_sent); |
648 | |
649 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
650 | xdr->len - req->rq_bytes_sent, status); |
651 | |
652 | if (unlikely(status < 0)) |
653 | break; |
654 | |
655 | /* If we've sent the entire packet, immediately |
656 | * reset the count of bytes sent. */ |
657 | req->rq_bytes_sent += status; |
658 | task->tk_bytes_sent += status; |
659 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
660 | req->rq_bytes_sent = 0; |
661 | return 0; |
662 | } |
663 | |
664 | if (status != 0) |
665 | continue; |
666 | status = -EAGAIN; |
667 | break; |
668 | } |
669 | if (!transport->sock) |
670 | goto out; |
671 | |
672 | switch (status) { |
673 | case -ENOTSOCK: |
674 | status = -ENOTCONN; |
675 | /* Should we call xs_close() here? */ |
676 | break; |
677 | case -EAGAIN: |
678 | status = xs_nospace(task); |
679 | break; |
680 | default: |
681 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
682 | -status); |
683 | case -ECONNRESET: |
684 | case -EPIPE: |
685 | xs_tcp_shutdown(xprt); |
686 | case -ECONNREFUSED: |
687 | case -ENOTCONN: |
688 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
689 | } |
690 | out: |
691 | return status; |
692 | } |
693 | |
694 | /** |
695 | * xs_tcp_release_xprt - clean up after a tcp transmission |
696 | * @xprt: transport |
697 | * @task: rpc task |
698 | * |
699 | * This cleans up if an error causes us to abort the transmission of a request. |
700 | * In this case, the socket may need to be reset in order to avoid confusing |
701 | * the server. |
702 | */ |
703 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
704 | { |
705 | struct rpc_rqst *req; |
706 | |
707 | if (task != xprt->snd_task) |
708 | return; |
709 | if (task == NULL) |
710 | goto out_release; |
711 | req = task->tk_rqstp; |
712 | if (req->rq_bytes_sent == 0) |
713 | goto out_release; |
714 | if (req->rq_bytes_sent == req->rq_snd_buf.len) |
715 | goto out_release; |
716 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); |
717 | out_release: |
718 | xprt_release_xprt(xprt, task); |
719 | } |
720 | |
721 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
722 | { |
723 | transport->old_data_ready = sk->sk_data_ready; |
724 | transport->old_state_change = sk->sk_state_change; |
725 | transport->old_write_space = sk->sk_write_space; |
726 | transport->old_error_report = sk->sk_error_report; |
727 | } |
728 | |
729 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
730 | { |
731 | sk->sk_data_ready = transport->old_data_ready; |
732 | sk->sk_state_change = transport->old_state_change; |
733 | sk->sk_write_space = transport->old_write_space; |
734 | sk->sk_error_report = transport->old_error_report; |
735 | } |
736 | |
737 | static void xs_reset_transport(struct sock_xprt *transport) |
738 | { |
739 | struct socket *sock = transport->sock; |
740 | struct sock *sk = transport->inet; |
741 | |
742 | if (sk == NULL) |
743 | return; |
744 | |
745 | write_lock_bh(&sk->sk_callback_lock); |
746 | transport->inet = NULL; |
747 | transport->sock = NULL; |
748 | |
749 | sk->sk_user_data = NULL; |
750 | |
751 | xs_restore_old_callbacks(transport, sk); |
752 | write_unlock_bh(&sk->sk_callback_lock); |
753 | |
754 | sk->sk_no_check = 0; |
755 | |
756 | sock_release(sock); |
757 | } |
758 | |
759 | /** |
760 | * xs_close - close a socket |
761 | * @xprt: transport |
762 | * |
763 | * This is used when all requests are complete; ie, no DRC state remains |
764 | * on the server we want to save. |
765 | * |
766 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with |
767 | * xs_reset_transport() zeroing the socket from underneath a writer. |
768 | */ |
769 | static void xs_close(struct rpc_xprt *xprt) |
770 | { |
771 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
772 | |
773 | dprintk("RPC: xs_close xprt %p\n", xprt); |
774 | |
775 | xs_reset_transport(transport); |
776 | xprt->reestablish_timeout = 0; |
777 | |
778 | smp_mb__before_clear_bit(); |
779 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
780 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
781 | clear_bit(XPRT_CLOSING, &xprt->state); |
782 | smp_mb__after_clear_bit(); |
783 | xprt_disconnect_done(xprt); |
784 | } |
785 | |
786 | static void xs_tcp_close(struct rpc_xprt *xprt) |
787 | { |
788 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) |
789 | xs_close(xprt); |
790 | else |
791 | xs_tcp_shutdown(xprt); |
792 | } |
793 | |
794 | /** |
795 | * xs_destroy - prepare to shutdown a transport |
796 | * @xprt: doomed transport |
797 | * |
798 | */ |
799 | static void xs_destroy(struct rpc_xprt *xprt) |
800 | { |
801 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
802 | |
803 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
804 | |
805 | cancel_rearming_delayed_work(&transport->connect_worker); |
806 | |
807 | xs_close(xprt); |
808 | xs_free_peer_addresses(xprt); |
809 | kfree(xprt->slot); |
810 | kfree(xprt); |
811 | module_put(THIS_MODULE); |
812 | } |
813 | |
814 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
815 | { |
816 | return (struct rpc_xprt *) sk->sk_user_data; |
817 | } |
818 | |
819 | /** |
820 | * xs_udp_data_ready - "data ready" callback for UDP sockets |
821 | * @sk: socket with data to read |
822 | * @len: how much data to read |
823 | * |
824 | */ |
825 | static void xs_udp_data_ready(struct sock *sk, int len) |
826 | { |
827 | struct rpc_task *task; |
828 | struct rpc_xprt *xprt; |
829 | struct rpc_rqst *rovr; |
830 | struct sk_buff *skb; |
831 | int err, repsize, copied; |
832 | u32 _xid; |
833 | __be32 *xp; |
834 | |
835 | read_lock(&sk->sk_callback_lock); |
836 | dprintk("RPC: xs_udp_data_ready...\n"); |
837 | if (!(xprt = xprt_from_sock(sk))) |
838 | goto out; |
839 | |
840 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) |
841 | goto out; |
842 | |
843 | if (xprt->shutdown) |
844 | goto dropit; |
845 | |
846 | repsize = skb->len - sizeof(struct udphdr); |
847 | if (repsize < 4) { |
848 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
849 | goto dropit; |
850 | } |
851 | |
852 | /* Copy the XID from the skb... */ |
853 | xp = skb_header_pointer(skb, sizeof(struct udphdr), |
854 | sizeof(_xid), &_xid); |
855 | if (xp == NULL) |
856 | goto dropit; |
857 | |
858 | /* Look up and lock the request corresponding to the given XID */ |
859 | spin_lock(&xprt->transport_lock); |
860 | rovr = xprt_lookup_rqst(xprt, *xp); |
861 | if (!rovr) |
862 | goto out_unlock; |
863 | task = rovr->rq_task; |
864 | |
865 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
866 | copied = repsize; |
867 | |
868 | /* Suck it into the iovec, verify checksum if not done by hw. */ |
869 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
870 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); |
871 | goto out_unlock; |
872 | } |
873 | |
874 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); |
875 | |
876 | /* Something worked... */ |
877 | dst_confirm(skb_dst(skb)); |
878 | |
879 | xprt_adjust_cwnd(task, copied); |
880 | xprt_update_rtt(task); |
881 | xprt_complete_rqst(task, copied); |
882 | |
883 | out_unlock: |
884 | spin_unlock(&xprt->transport_lock); |
885 | dropit: |
886 | skb_free_datagram(sk, skb); |
887 | out: |
888 | read_unlock(&sk->sk_callback_lock); |
889 | } |
890 | |
891 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
892 | { |
893 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
894 | size_t len, used; |
895 | char *p; |
896 | |
897 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
898 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; |
899 | used = xdr_skb_read_bits(desc, p, len); |
900 | transport->tcp_offset += used; |
901 | if (used != len) |
902 | return; |
903 | |
904 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
905 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) |
906 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
907 | else |
908 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
909 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
910 | |
911 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
912 | transport->tcp_offset = 0; |
913 | |
914 | /* Sanity check of the record length */ |
915 | if (unlikely(transport->tcp_reclen < 8)) { |
916 | dprintk("RPC: invalid TCP record fragment length\n"); |
917 | xprt_force_disconnect(xprt); |
918 | return; |
919 | } |
920 | dprintk("RPC: reading TCP record fragment of length %d\n", |
921 | transport->tcp_reclen); |
922 | } |
923 | |
924 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
925 | { |
926 | if (transport->tcp_offset == transport->tcp_reclen) { |
927 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
928 | transport->tcp_offset = 0; |
929 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
930 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
931 | transport->tcp_flags |= TCP_RCV_COPY_XID; |
932 | transport->tcp_copied = 0; |
933 | } |
934 | } |
935 | } |
936 | |
937 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
938 | { |
939 | size_t len, used; |
940 | char *p; |
941 | |
942 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
943 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
944 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
945 | used = xdr_skb_read_bits(desc, p, len); |
946 | transport->tcp_offset += used; |
947 | if (used != len) |
948 | return; |
949 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
950 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
951 | transport->tcp_copied = 4; |
952 | dprintk("RPC: reading %s XID %08x\n", |
953 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" |
954 | : "request with", |
955 | ntohl(transport->tcp_xid)); |
956 | xs_tcp_check_fraghdr(transport); |
957 | } |
958 | |
959 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
960 | struct xdr_skb_reader *desc) |
961 | { |
962 | size_t len, used; |
963 | u32 offset; |
964 | __be32 calldir; |
965 | |
966 | /* |
967 | * We want transport->tcp_offset to be 8 at the end of this routine |
968 | * (4 bytes for the xid and 4 bytes for the call/reply flag). |
969 | * When this function is called for the first time, |
970 | * transport->tcp_offset is 4 (after having already read the xid). |
971 | */ |
972 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); |
973 | len = sizeof(calldir) - offset; |
974 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
975 | used = xdr_skb_read_bits(desc, &calldir, len); |
976 | transport->tcp_offset += used; |
977 | if (used != len) |
978 | return; |
979 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
980 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; |
981 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
982 | /* |
983 | * We don't yet have the XDR buffer, so we will write the calldir |
984 | * out after we get the buffer from the 'struct rpc_rqst' |
985 | */ |
986 | if (ntohl(calldir) == RPC_REPLY) |
987 | transport->tcp_flags |= TCP_RPC_REPLY; |
988 | else |
989 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
990 | dprintk("RPC: reading %s CALL/REPLY flag %08x\n", |
991 | (transport->tcp_flags & TCP_RPC_REPLY) ? |
992 | "reply for" : "request with", calldir); |
993 | xs_tcp_check_fraghdr(transport); |
994 | } |
995 | |
996 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
997 | struct xdr_skb_reader *desc, |
998 | struct rpc_rqst *req) |
999 | { |
1000 | struct sock_xprt *transport = |
1001 | container_of(xprt, struct sock_xprt, xprt); |
1002 | struct xdr_buf *rcvbuf; |
1003 | size_t len; |
1004 | ssize_t r; |
1005 | |
1006 | rcvbuf = &req->rq_private_buf; |
1007 | |
1008 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { |
1009 | /* |
1010 | * Save the RPC direction in the XDR buffer |
1011 | */ |
1012 | __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? |
1013 | htonl(RPC_REPLY) : 0; |
1014 | |
1015 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
1016 | &calldir, sizeof(calldir)); |
1017 | transport->tcp_copied += sizeof(calldir); |
1018 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
1019 | } |
1020 | |
1021 | len = desc->count; |
1022 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
1023 | struct xdr_skb_reader my_desc; |
1024 | |
1025 | len = transport->tcp_reclen - transport->tcp_offset; |
1026 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1027 | my_desc.count = len; |
1028 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
1029 | &my_desc, xdr_skb_read_bits); |
1030 | desc->count -= r; |
1031 | desc->offset += r; |
1032 | } else |
1033 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
1034 | desc, xdr_skb_read_bits); |
1035 | |
1036 | if (r > 0) { |
1037 | transport->tcp_copied += r; |
1038 | transport->tcp_offset += r; |
1039 | } |
1040 | if (r != len) { |
1041 | /* Error when copying to the receive buffer, |
1042 | * usually because we weren't able to allocate |
1043 | * additional buffer pages. All we can do now |
1044 | * is turn off TCP_RCV_COPY_DATA, so the request |
1045 | * will not receive any additional updates, |
1046 | * and time out. |
1047 | * Any remaining data from this record will |
1048 | * be discarded. |
1049 | */ |
1050 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1051 | dprintk("RPC: XID %08x truncated request\n", |
1052 | ntohl(transport->tcp_xid)); |
1053 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1054 | "tcp_offset = %u, tcp_reclen = %u\n", |
1055 | xprt, transport->tcp_copied, |
1056 | transport->tcp_offset, transport->tcp_reclen); |
1057 | return; |
1058 | } |
1059 | |
1060 | dprintk("RPC: XID %08x read %Zd bytes\n", |
1061 | ntohl(transport->tcp_xid), r); |
1062 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1063 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, |
1064 | transport->tcp_offset, transport->tcp_reclen); |
1065 | |
1066 | if (transport->tcp_copied == req->rq_private_buf.buflen) |
1067 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1068 | else if (transport->tcp_offset == transport->tcp_reclen) { |
1069 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1070 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1071 | } |
1072 | |
1073 | return; |
1074 | } |
1075 | |
1076 | /* |
1077 | * Finds the request corresponding to the RPC xid and invokes the common |
1078 | * tcp read code to read the data. |
1079 | */ |
1080 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, |
1081 | struct xdr_skb_reader *desc) |
1082 | { |
1083 | struct sock_xprt *transport = |
1084 | container_of(xprt, struct sock_xprt, xprt); |
1085 | struct rpc_rqst *req; |
1086 | |
1087 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); |
1088 | |
1089 | /* Find and lock the request corresponding to this xid */ |
1090 | spin_lock(&xprt->transport_lock); |
1091 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
1092 | if (!req) { |
1093 | dprintk("RPC: XID %08x request not found!\n", |
1094 | ntohl(transport->tcp_xid)); |
1095 | spin_unlock(&xprt->transport_lock); |
1096 | return -1; |
1097 | } |
1098 | |
1099 | xs_tcp_read_common(xprt, desc, req); |
1100 | |
1101 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
1102 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
1103 | |
1104 | spin_unlock(&xprt->transport_lock); |
1105 | return 0; |
1106 | } |
1107 | |
1108 | #if defined(CONFIG_NFS_V4_1) |
1109 | /* |
1110 | * Obtains an rpc_rqst previously allocated and invokes the common |
1111 | * tcp read code to read the data. The result is placed in the callback |
1112 | * queue. |
1113 | * If we're unable to obtain the rpc_rqst we schedule the closing of the |
1114 | * connection and return -1. |
1115 | */ |
1116 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, |
1117 | struct xdr_skb_reader *desc) |
1118 | { |
1119 | struct sock_xprt *transport = |
1120 | container_of(xprt, struct sock_xprt, xprt); |
1121 | struct rpc_rqst *req; |
1122 | |
1123 | req = xprt_alloc_bc_request(xprt); |
1124 | if (req == NULL) { |
1125 | printk(KERN_WARNING "Callback slot table overflowed\n"); |
1126 | xprt_force_disconnect(xprt); |
1127 | return -1; |
1128 | } |
1129 | |
1130 | req->rq_xid = transport->tcp_xid; |
1131 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); |
1132 | xs_tcp_read_common(xprt, desc, req); |
1133 | |
1134 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { |
1135 | struct svc_serv *bc_serv = xprt->bc_serv; |
1136 | |
1137 | /* |
1138 | * Add callback request to callback list. The callback |
1139 | * service sleeps on the sv_cb_waitq waiting for new |
1140 | * requests. Wake it up after adding enqueing the |
1141 | * request. |
1142 | */ |
1143 | dprintk("RPC: add callback request to list\n"); |
1144 | spin_lock(&bc_serv->sv_cb_lock); |
1145 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); |
1146 | spin_unlock(&bc_serv->sv_cb_lock); |
1147 | wake_up(&bc_serv->sv_cb_waitq); |
1148 | } |
1149 | |
1150 | req->rq_private_buf.len = transport->tcp_copied; |
1151 | |
1152 | return 0; |
1153 | } |
1154 | |
1155 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, |
1156 | struct xdr_skb_reader *desc) |
1157 | { |
1158 | struct sock_xprt *transport = |
1159 | container_of(xprt, struct sock_xprt, xprt); |
1160 | |
1161 | return (transport->tcp_flags & TCP_RPC_REPLY) ? |
1162 | xs_tcp_read_reply(xprt, desc) : |
1163 | xs_tcp_read_callback(xprt, desc); |
1164 | } |
1165 | #else |
1166 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, |
1167 | struct xdr_skb_reader *desc) |
1168 | { |
1169 | return xs_tcp_read_reply(xprt, desc); |
1170 | } |
1171 | #endif /* CONFIG_NFS_V4_1 */ |
1172 | |
1173 | /* |
1174 | * Read data off the transport. This can be either an RPC_CALL or an |
1175 | * RPC_REPLY. Relay the processing to helper functions. |
1176 | */ |
1177 | static void xs_tcp_read_data(struct rpc_xprt *xprt, |
1178 | struct xdr_skb_reader *desc) |
1179 | { |
1180 | struct sock_xprt *transport = |
1181 | container_of(xprt, struct sock_xprt, xprt); |
1182 | |
1183 | if (_xs_tcp_read_data(xprt, desc) == 0) |
1184 | xs_tcp_check_fraghdr(transport); |
1185 | else { |
1186 | /* |
1187 | * The transport_lock protects the request handling. |
1188 | * There's no need to hold it to update the tcp_flags. |
1189 | */ |
1190 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1191 | } |
1192 | } |
1193 | |
1194 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
1195 | { |
1196 | size_t len; |
1197 | |
1198 | len = transport->tcp_reclen - transport->tcp_offset; |
1199 | if (len > desc->count) |
1200 | len = desc->count; |
1201 | desc->count -= len; |
1202 | desc->offset += len; |
1203 | transport->tcp_offset += len; |
1204 | dprintk("RPC: discarded %Zu bytes\n", len); |
1205 | xs_tcp_check_fraghdr(transport); |
1206 | } |
1207 | |
1208 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
1209 | { |
1210 | struct rpc_xprt *xprt = rd_desc->arg.data; |
1211 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1212 | struct xdr_skb_reader desc = { |
1213 | .skb = skb, |
1214 | .offset = offset, |
1215 | .count = len, |
1216 | }; |
1217 | |
1218 | dprintk("RPC: xs_tcp_data_recv started\n"); |
1219 | do { |
1220 | /* Read in a new fragment marker if necessary */ |
1221 | /* Can we ever really expect to get completely empty fragments? */ |
1222 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
1223 | xs_tcp_read_fraghdr(xprt, &desc); |
1224 | continue; |
1225 | } |
1226 | /* Read in the xid if necessary */ |
1227 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
1228 | xs_tcp_read_xid(transport, &desc); |
1229 | continue; |
1230 | } |
1231 | /* Read in the call/reply flag */ |
1232 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
1233 | xs_tcp_read_calldir(transport, &desc); |
1234 | continue; |
1235 | } |
1236 | /* Read in the request data */ |
1237 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
1238 | xs_tcp_read_data(xprt, &desc); |
1239 | continue; |
1240 | } |
1241 | /* Skip over any trailing bytes on short reads */ |
1242 | xs_tcp_read_discard(transport, &desc); |
1243 | } while (desc.count); |
1244 | dprintk("RPC: xs_tcp_data_recv done\n"); |
1245 | return len - desc.count; |
1246 | } |
1247 | |
1248 | /** |
1249 | * xs_tcp_data_ready - "data ready" callback for TCP sockets |
1250 | * @sk: socket with data to read |
1251 | * @bytes: how much data to read |
1252 | * |
1253 | */ |
1254 | static void xs_tcp_data_ready(struct sock *sk, int bytes) |
1255 | { |
1256 | struct rpc_xprt *xprt; |
1257 | read_descriptor_t rd_desc; |
1258 | int read; |
1259 | |
1260 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1261 | |
1262 | read_lock(&sk->sk_callback_lock); |
1263 | if (!(xprt = xprt_from_sock(sk))) |
1264 | goto out; |
1265 | if (xprt->shutdown) |
1266 | goto out; |
1267 | |
1268 | /* Any data means we had a useful conversation, so |
1269 | * the we don't need to delay the next reconnect |
1270 | */ |
1271 | if (xprt->reestablish_timeout) |
1272 | xprt->reestablish_timeout = 0; |
1273 | |
1274 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
1275 | rd_desc.arg.data = xprt; |
1276 | do { |
1277 | rd_desc.count = 65536; |
1278 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
1279 | } while (read > 0); |
1280 | out: |
1281 | read_unlock(&sk->sk_callback_lock); |
1282 | } |
1283 | |
1284 | /* |
1285 | * Do the equivalent of linger/linger2 handling for dealing with |
1286 | * broken servers that don't close the socket in a timely |
1287 | * fashion |
1288 | */ |
1289 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, |
1290 | unsigned long timeout) |
1291 | { |
1292 | struct sock_xprt *transport; |
1293 | |
1294 | if (xprt_test_and_set_connecting(xprt)) |
1295 | return; |
1296 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1297 | transport = container_of(xprt, struct sock_xprt, xprt); |
1298 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, |
1299 | timeout); |
1300 | } |
1301 | |
1302 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) |
1303 | { |
1304 | struct sock_xprt *transport; |
1305 | |
1306 | transport = container_of(xprt, struct sock_xprt, xprt); |
1307 | |
1308 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || |
1309 | !cancel_delayed_work(&transport->connect_worker)) |
1310 | return; |
1311 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1312 | xprt_clear_connecting(xprt); |
1313 | } |
1314 | |
1315 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) |
1316 | { |
1317 | smp_mb__before_clear_bit(); |
1318 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1319 | clear_bit(XPRT_CLOSING, &xprt->state); |
1320 | smp_mb__after_clear_bit(); |
1321 | /* Mark transport as closed and wake up all pending tasks */ |
1322 | xprt_disconnect_done(xprt); |
1323 | } |
1324 | |
1325 | /** |
1326 | * xs_tcp_state_change - callback to handle TCP socket state changes |
1327 | * @sk: socket whose state has changed |
1328 | * |
1329 | */ |
1330 | static void xs_tcp_state_change(struct sock *sk) |
1331 | { |
1332 | struct rpc_xprt *xprt; |
1333 | |
1334 | read_lock(&sk->sk_callback_lock); |
1335 | if (!(xprt = xprt_from_sock(sk))) |
1336 | goto out; |
1337 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1338 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", |
1339 | sk->sk_state, xprt_connected(xprt), |
1340 | sock_flag(sk, SOCK_DEAD), |
1341 | sock_flag(sk, SOCK_ZAPPED)); |
1342 | |
1343 | switch (sk->sk_state) { |
1344 | case TCP_ESTABLISHED: |
1345 | spin_lock_bh(&xprt->transport_lock); |
1346 | if (!xprt_test_and_set_connected(xprt)) { |
1347 | struct sock_xprt *transport = container_of(xprt, |
1348 | struct sock_xprt, xprt); |
1349 | |
1350 | /* Reset TCP record info */ |
1351 | transport->tcp_offset = 0; |
1352 | transport->tcp_reclen = 0; |
1353 | transport->tcp_copied = 0; |
1354 | transport->tcp_flags = |
1355 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; |
1356 | |
1357 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
1358 | } |
1359 | spin_unlock_bh(&xprt->transport_lock); |
1360 | break; |
1361 | case TCP_FIN_WAIT1: |
1362 | /* The client initiated a shutdown of the socket */ |
1363 | xprt->connect_cookie++; |
1364 | xprt->reestablish_timeout = 0; |
1365 | set_bit(XPRT_CLOSING, &xprt->state); |
1366 | smp_mb__before_clear_bit(); |
1367 | clear_bit(XPRT_CONNECTED, &xprt->state); |
1368 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1369 | smp_mb__after_clear_bit(); |
1370 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
1371 | break; |
1372 | case TCP_CLOSE_WAIT: |
1373 | /* The server initiated a shutdown of the socket */ |
1374 | xprt_force_disconnect(xprt); |
1375 | case TCP_SYN_SENT: |
1376 | xprt->connect_cookie++; |
1377 | case TCP_CLOSING: |
1378 | /* |
1379 | * If the server closed down the connection, make sure that |
1380 | * we back off before reconnecting |
1381 | */ |
1382 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
1383 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
1384 | break; |
1385 | case TCP_LAST_ACK: |
1386 | set_bit(XPRT_CLOSING, &xprt->state); |
1387 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
1388 | smp_mb__before_clear_bit(); |
1389 | clear_bit(XPRT_CONNECTED, &xprt->state); |
1390 | smp_mb__after_clear_bit(); |
1391 | break; |
1392 | case TCP_CLOSE: |
1393 | xs_tcp_cancel_linger_timeout(xprt); |
1394 | xs_sock_mark_closed(xprt); |
1395 | } |
1396 | out: |
1397 | read_unlock(&sk->sk_callback_lock); |
1398 | } |
1399 | |
1400 | /** |
1401 | * xs_error_report - callback mainly for catching socket errors |
1402 | * @sk: socket |
1403 | */ |
1404 | static void xs_error_report(struct sock *sk) |
1405 | { |
1406 | struct rpc_xprt *xprt; |
1407 | |
1408 | read_lock(&sk->sk_callback_lock); |
1409 | if (!(xprt = xprt_from_sock(sk))) |
1410 | goto out; |
1411 | dprintk("RPC: %s client %p...\n" |
1412 | "RPC: error %d\n", |
1413 | __func__, xprt, sk->sk_err); |
1414 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
1415 | out: |
1416 | read_unlock(&sk->sk_callback_lock); |
1417 | } |
1418 | |
1419 | static void xs_write_space(struct sock *sk) |
1420 | { |
1421 | struct socket *sock; |
1422 | struct rpc_xprt *xprt; |
1423 | |
1424 | if (unlikely(!(sock = sk->sk_socket))) |
1425 | return; |
1426 | clear_bit(SOCK_NOSPACE, &sock->flags); |
1427 | |
1428 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
1429 | return; |
1430 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) |
1431 | return; |
1432 | |
1433 | xprt_write_space(xprt); |
1434 | } |
1435 | |
1436 | /** |
1437 | * xs_udp_write_space - callback invoked when socket buffer space |
1438 | * becomes available |
1439 | * @sk: socket whose state has changed |
1440 | * |
1441 | * Called when more output buffer space is available for this socket. |
1442 | * We try not to wake our writers until they can make "significant" |
1443 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
1444 | * with a bunch of small requests. |
1445 | */ |
1446 | static void xs_udp_write_space(struct sock *sk) |
1447 | { |
1448 | read_lock(&sk->sk_callback_lock); |
1449 | |
1450 | /* from net/core/sock.c:sock_def_write_space */ |
1451 | if (sock_writeable(sk)) |
1452 | xs_write_space(sk); |
1453 | |
1454 | read_unlock(&sk->sk_callback_lock); |
1455 | } |
1456 | |
1457 | /** |
1458 | * xs_tcp_write_space - callback invoked when socket buffer space |
1459 | * becomes available |
1460 | * @sk: socket whose state has changed |
1461 | * |
1462 | * Called when more output buffer space is available for this socket. |
1463 | * We try not to wake our writers until they can make "significant" |
1464 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
1465 | * with a bunch of small requests. |
1466 | */ |
1467 | static void xs_tcp_write_space(struct sock *sk) |
1468 | { |
1469 | read_lock(&sk->sk_callback_lock); |
1470 | |
1471 | /* from net/core/stream.c:sk_stream_write_space */ |
1472 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1473 | xs_write_space(sk); |
1474 | |
1475 | read_unlock(&sk->sk_callback_lock); |
1476 | } |
1477 | |
1478 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
1479 | { |
1480 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1481 | struct sock *sk = transport->inet; |
1482 | |
1483 | if (transport->rcvsize) { |
1484 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
1485 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
1486 | } |
1487 | if (transport->sndsize) { |
1488 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
1489 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
1490 | sk->sk_write_space(sk); |
1491 | } |
1492 | } |
1493 | |
1494 | /** |
1495 | * xs_udp_set_buffer_size - set send and receive limits |
1496 | * @xprt: generic transport |
1497 | * @sndsize: requested size of send buffer, in bytes |
1498 | * @rcvsize: requested size of receive buffer, in bytes |
1499 | * |
1500 | * Set socket send and receive buffer size limits. |
1501 | */ |
1502 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
1503 | { |
1504 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1505 | |
1506 | transport->sndsize = 0; |
1507 | if (sndsize) |
1508 | transport->sndsize = sndsize + 1024; |
1509 | transport->rcvsize = 0; |
1510 | if (rcvsize) |
1511 | transport->rcvsize = rcvsize + 1024; |
1512 | |
1513 | xs_udp_do_set_buffer_size(xprt); |
1514 | } |
1515 | |
1516 | /** |
1517 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport |
1518 | * @task: task that timed out |
1519 | * |
1520 | * Adjust the congestion window after a retransmit timeout has occurred. |
1521 | */ |
1522 | static void xs_udp_timer(struct rpc_task *task) |
1523 | { |
1524 | xprt_adjust_cwnd(task, -ETIMEDOUT); |
1525 | } |
1526 | |
1527 | static unsigned short xs_get_random_port(void) |
1528 | { |
1529 | unsigned short range = xprt_max_resvport - xprt_min_resvport; |
1530 | unsigned short rand = (unsigned short) net_random() % range; |
1531 | return rand + xprt_min_resvport; |
1532 | } |
1533 | |
1534 | /** |
1535 | * xs_set_port - reset the port number in the remote endpoint address |
1536 | * @xprt: generic transport |
1537 | * @port: new port number |
1538 | * |
1539 | */ |
1540 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) |
1541 | { |
1542 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
1543 | |
1544 | rpc_set_port(xs_addr(xprt), port); |
1545 | xs_update_peer_port(xprt); |
1546 | } |
1547 | |
1548 | static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) |
1549 | { |
1550 | unsigned short port = transport->srcport; |
1551 | |
1552 | if (port == 0 && transport->xprt.resvport) |
1553 | port = xs_get_random_port(); |
1554 | return port; |
1555 | } |
1556 | |
1557 | static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) |
1558 | { |
1559 | if (transport->srcport != 0) |
1560 | transport->srcport = 0; |
1561 | if (!transport->xprt.resvport) |
1562 | return 0; |
1563 | if (port <= xprt_min_resvport || port > xprt_max_resvport) |
1564 | return xprt_max_resvport; |
1565 | return --port; |
1566 | } |
1567 | |
1568 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
1569 | { |
1570 | struct sockaddr_in myaddr = { |
1571 | .sin_family = AF_INET, |
1572 | }; |
1573 | struct sockaddr_in *sa; |
1574 | int err, nloop = 0; |
1575 | unsigned short port = xs_get_srcport(transport, sock); |
1576 | unsigned short last; |
1577 | |
1578 | sa = (struct sockaddr_in *)&transport->srcaddr; |
1579 | myaddr.sin_addr = sa->sin_addr; |
1580 | do { |
1581 | myaddr.sin_port = htons(port); |
1582 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
1583 | sizeof(myaddr)); |
1584 | if (port == 0) |
1585 | break; |
1586 | if (err == 0) { |
1587 | transport->srcport = port; |
1588 | break; |
1589 | } |
1590 | last = port; |
1591 | port = xs_next_srcport(transport, sock, port); |
1592 | if (port > last) |
1593 | nloop++; |
1594 | } while (err == -EADDRINUSE && nloop != 2); |
1595 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", |
1596 | __func__, &myaddr.sin_addr, |
1597 | port, err ? "failed" : "ok", err); |
1598 | return err; |
1599 | } |
1600 | |
1601 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1602 | { |
1603 | struct sockaddr_in6 myaddr = { |
1604 | .sin6_family = AF_INET6, |
1605 | }; |
1606 | struct sockaddr_in6 *sa; |
1607 | int err, nloop = 0; |
1608 | unsigned short port = xs_get_srcport(transport, sock); |
1609 | unsigned short last; |
1610 | |
1611 | sa = (struct sockaddr_in6 *)&transport->srcaddr; |
1612 | myaddr.sin6_addr = sa->sin6_addr; |
1613 | do { |
1614 | myaddr.sin6_port = htons(port); |
1615 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
1616 | sizeof(myaddr)); |
1617 | if (port == 0) |
1618 | break; |
1619 | if (err == 0) { |
1620 | transport->srcport = port; |
1621 | break; |
1622 | } |
1623 | last = port; |
1624 | port = xs_next_srcport(transport, sock, port); |
1625 | if (port > last) |
1626 | nloop++; |
1627 | } while (err == -EADDRINUSE && nloop != 2); |
1628 | dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", |
1629 | &myaddr.sin6_addr, port, err ? "failed" : "ok", err); |
1630 | return err; |
1631 | } |
1632 | |
1633 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1634 | static struct lock_class_key xs_key[2]; |
1635 | static struct lock_class_key xs_slock_key[2]; |
1636 | |
1637 | static inline void xs_reclassify_socket4(struct socket *sock) |
1638 | { |
1639 | struct sock *sk = sock->sk; |
1640 | |
1641 | BUG_ON(sock_owned_by_user(sk)); |
1642 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1643 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); |
1644 | } |
1645 | |
1646 | static inline void xs_reclassify_socket6(struct socket *sock) |
1647 | { |
1648 | struct sock *sk = sock->sk; |
1649 | |
1650 | BUG_ON(sock_owned_by_user(sk)); |
1651 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1652 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); |
1653 | } |
1654 | #else |
1655 | static inline void xs_reclassify_socket4(struct socket *sock) |
1656 | { |
1657 | } |
1658 | |
1659 | static inline void xs_reclassify_socket6(struct socket *sock) |
1660 | { |
1661 | } |
1662 | #endif |
1663 | |
1664 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1665 | { |
1666 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1667 | |
1668 | if (!transport->inet) { |
1669 | struct sock *sk = sock->sk; |
1670 | |
1671 | write_lock_bh(&sk->sk_callback_lock); |
1672 | |
1673 | xs_save_old_callbacks(transport, sk); |
1674 | |
1675 | sk->sk_user_data = xprt; |
1676 | sk->sk_data_ready = xs_udp_data_ready; |
1677 | sk->sk_write_space = xs_udp_write_space; |
1678 | sk->sk_error_report = xs_error_report; |
1679 | sk->sk_no_check = UDP_CSUM_NORCV; |
1680 | sk->sk_allocation = GFP_ATOMIC; |
1681 | |
1682 | xprt_set_connected(xprt); |
1683 | |
1684 | /* Reset to new socket */ |
1685 | transport->sock = sock; |
1686 | transport->inet = sk; |
1687 | |
1688 | write_unlock_bh(&sk->sk_callback_lock); |
1689 | } |
1690 | xs_udp_do_set_buffer_size(xprt); |
1691 | } |
1692 | |
1693 | /** |
1694 | * xs_udp_connect_worker4 - set up a UDP socket |
1695 | * @work: RPC transport to connect |
1696 | * |
1697 | * Invoked by a work queue tasklet. |
1698 | */ |
1699 | static void xs_udp_connect_worker4(struct work_struct *work) |
1700 | { |
1701 | struct sock_xprt *transport = |
1702 | container_of(work, struct sock_xprt, connect_worker.work); |
1703 | struct rpc_xprt *xprt = &transport->xprt; |
1704 | struct socket *sock = transport->sock; |
1705 | int err, status = -EIO; |
1706 | |
1707 | if (xprt->shutdown) |
1708 | goto out; |
1709 | |
1710 | /* Start by resetting any existing state */ |
1711 | xs_reset_transport(transport); |
1712 | |
1713 | err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1714 | if (err < 0) { |
1715 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1716 | goto out; |
1717 | } |
1718 | xs_reclassify_socket4(sock); |
1719 | |
1720 | if (xs_bind4(transport, sock)) { |
1721 | sock_release(sock); |
1722 | goto out; |
1723 | } |
1724 | |
1725 | dprintk("RPC: worker connecting xprt %p via %s to " |
1726 | "%s (port %s)\n", xprt, |
1727 | xprt->address_strings[RPC_DISPLAY_PROTO], |
1728 | xprt->address_strings[RPC_DISPLAY_ADDR], |
1729 | xprt->address_strings[RPC_DISPLAY_PORT]); |
1730 | |
1731 | xs_udp_finish_connecting(xprt, sock); |
1732 | status = 0; |
1733 | out: |
1734 | xprt_clear_connecting(xprt); |
1735 | xprt_wake_pending_tasks(xprt, status); |
1736 | } |
1737 | |
1738 | /** |
1739 | * xs_udp_connect_worker6 - set up a UDP socket |
1740 | * @work: RPC transport to connect |
1741 | * |
1742 | * Invoked by a work queue tasklet. |
1743 | */ |
1744 | static void xs_udp_connect_worker6(struct work_struct *work) |
1745 | { |
1746 | struct sock_xprt *transport = |
1747 | container_of(work, struct sock_xprt, connect_worker.work); |
1748 | struct rpc_xprt *xprt = &transport->xprt; |
1749 | struct socket *sock = transport->sock; |
1750 | int err, status = -EIO; |
1751 | |
1752 | if (xprt->shutdown) |
1753 | goto out; |
1754 | |
1755 | /* Start by resetting any existing state */ |
1756 | xs_reset_transport(transport); |
1757 | |
1758 | err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1759 | if (err < 0) { |
1760 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1761 | goto out; |
1762 | } |
1763 | xs_reclassify_socket6(sock); |
1764 | |
1765 | if (xs_bind6(transport, sock) < 0) { |
1766 | sock_release(sock); |
1767 | goto out; |
1768 | } |
1769 | |
1770 | dprintk("RPC: worker connecting xprt %p via %s to " |
1771 | "%s (port %s)\n", xprt, |
1772 | xprt->address_strings[RPC_DISPLAY_PROTO], |
1773 | xprt->address_strings[RPC_DISPLAY_ADDR], |
1774 | xprt->address_strings[RPC_DISPLAY_PORT]); |
1775 | |
1776 | xs_udp_finish_connecting(xprt, sock); |
1777 | status = 0; |
1778 | out: |
1779 | xprt_clear_connecting(xprt); |
1780 | xprt_wake_pending_tasks(xprt, status); |
1781 | } |
1782 | |
1783 | /* |
1784 | * We need to preserve the port number so the reply cache on the server can |
1785 | * find our cached RPC replies when we get around to reconnecting. |
1786 | */ |
1787 | static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1788 | { |
1789 | int result; |
1790 | struct sockaddr any; |
1791 | |
1792 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
1793 | |
1794 | /* |
1795 | * Disconnect the transport socket by doing a connect operation |
1796 | * with AF_UNSPEC. This should return immediately... |
1797 | */ |
1798 | memset(&any, 0, sizeof(any)); |
1799 | any.sa_family = AF_UNSPEC; |
1800 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
1801 | if (!result) |
1802 | xs_sock_mark_closed(xprt); |
1803 | else |
1804 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
1805 | result); |
1806 | } |
1807 | |
1808 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1809 | { |
1810 | unsigned int state = transport->inet->sk_state; |
1811 | |
1812 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) |
1813 | return; |
1814 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) |
1815 | return; |
1816 | xs_abort_connection(xprt, transport); |
1817 | } |
1818 | |
1819 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1820 | { |
1821 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1822 | |
1823 | if (!transport->inet) { |
1824 | struct sock *sk = sock->sk; |
1825 | |
1826 | write_lock_bh(&sk->sk_callback_lock); |
1827 | |
1828 | xs_save_old_callbacks(transport, sk); |
1829 | |
1830 | sk->sk_user_data = xprt; |
1831 | sk->sk_data_ready = xs_tcp_data_ready; |
1832 | sk->sk_state_change = xs_tcp_state_change; |
1833 | sk->sk_write_space = xs_tcp_write_space; |
1834 | sk->sk_error_report = xs_error_report; |
1835 | sk->sk_allocation = GFP_ATOMIC; |
1836 | |
1837 | /* socket options */ |
1838 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
1839 | sock_reset_flag(sk, SOCK_LINGER); |
1840 | tcp_sk(sk)->linger2 = 0; |
1841 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1842 | |
1843 | xprt_clear_connected(xprt); |
1844 | |
1845 | /* Reset to new socket */ |
1846 | transport->sock = sock; |
1847 | transport->inet = sk; |
1848 | |
1849 | write_unlock_bh(&sk->sk_callback_lock); |
1850 | } |
1851 | |
1852 | if (!xprt_bound(xprt)) |
1853 | return -ENOTCONN; |
1854 | |
1855 | /* Tell the socket layer to start connecting... */ |
1856 | xprt->stat.connect_count++; |
1857 | xprt->stat.connect_start = jiffies; |
1858 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
1859 | } |
1860 | |
1861 | /** |
1862 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
1863 | * @xprt: RPC transport to connect |
1864 | * @transport: socket transport to connect |
1865 | * @create_sock: function to create a socket of the correct type |
1866 | * |
1867 | * Invoked by a work queue tasklet. |
1868 | */ |
1869 | static void xs_tcp_setup_socket(struct rpc_xprt *xprt, |
1870 | struct sock_xprt *transport, |
1871 | struct socket *(*create_sock)(struct rpc_xprt *, |
1872 | struct sock_xprt *)) |
1873 | { |
1874 | struct socket *sock = transport->sock; |
1875 | int status = -EIO; |
1876 | |
1877 | if (xprt->shutdown) |
1878 | goto out; |
1879 | |
1880 | if (!sock) { |
1881 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1882 | sock = create_sock(xprt, transport); |
1883 | if (IS_ERR(sock)) { |
1884 | status = PTR_ERR(sock); |
1885 | goto out; |
1886 | } |
1887 | } else { |
1888 | int abort_and_exit; |
1889 | |
1890 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
1891 | &xprt->state); |
1892 | /* "close" the socket, preserving the local port */ |
1893 | xs_tcp_reuse_connection(xprt, transport); |
1894 | |
1895 | if (abort_and_exit) |
1896 | goto out_eagain; |
1897 | } |
1898 | |
1899 | dprintk("RPC: worker connecting xprt %p via %s to " |
1900 | "%s (port %s)\n", xprt, |
1901 | xprt->address_strings[RPC_DISPLAY_PROTO], |
1902 | xprt->address_strings[RPC_DISPLAY_ADDR], |
1903 | xprt->address_strings[RPC_DISPLAY_PORT]); |
1904 | |
1905 | status = xs_tcp_finish_connecting(xprt, sock); |
1906 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1907 | xprt, -status, xprt_connected(xprt), |
1908 | sock->sk->sk_state); |
1909 | switch (status) { |
1910 | default: |
1911 | printk("%s: connect returned unhandled error %d\n", |
1912 | __func__, status); |
1913 | case -EADDRNOTAVAIL: |
1914 | /* We're probably in TIME_WAIT. Get rid of existing socket, |
1915 | * and retry |
1916 | */ |
1917 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
1918 | xprt_force_disconnect(xprt); |
1919 | break; |
1920 | case -ECONNREFUSED: |
1921 | case -ECONNRESET: |
1922 | case -ENETUNREACH: |
1923 | /* retry with existing socket, after a delay */ |
1924 | case 0: |
1925 | case -EINPROGRESS: |
1926 | case -EALREADY: |
1927 | xprt_clear_connecting(xprt); |
1928 | return; |
1929 | case -EINVAL: |
1930 | /* Happens, for instance, if the user specified a link |
1931 | * local IPv6 address without a scope-id. |
1932 | */ |
1933 | goto out; |
1934 | } |
1935 | out_eagain: |
1936 | status = -EAGAIN; |
1937 | out: |
1938 | xprt_clear_connecting(xprt); |
1939 | xprt_wake_pending_tasks(xprt, status); |
1940 | } |
1941 | |
1942 | static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, |
1943 | struct sock_xprt *transport) |
1944 | { |
1945 | struct socket *sock; |
1946 | int err; |
1947 | |
1948 | /* start from scratch */ |
1949 | err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
1950 | if (err < 0) { |
1951 | dprintk("RPC: can't create TCP transport socket (%d).\n", |
1952 | -err); |
1953 | goto out_err; |
1954 | } |
1955 | xs_reclassify_socket4(sock); |
1956 | |
1957 | if (xs_bind4(transport, sock) < 0) { |
1958 | sock_release(sock); |
1959 | goto out_err; |
1960 | } |
1961 | return sock; |
1962 | out_err: |
1963 | return ERR_PTR(-EIO); |
1964 | } |
1965 | |
1966 | /** |
1967 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
1968 | * @work: RPC transport to connect |
1969 | * |
1970 | * Invoked by a work queue tasklet. |
1971 | */ |
1972 | static void xs_tcp_connect_worker4(struct work_struct *work) |
1973 | { |
1974 | struct sock_xprt *transport = |
1975 | container_of(work, struct sock_xprt, connect_worker.work); |
1976 | struct rpc_xprt *xprt = &transport->xprt; |
1977 | |
1978 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); |
1979 | } |
1980 | |
1981 | static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, |
1982 | struct sock_xprt *transport) |
1983 | { |
1984 | struct socket *sock; |
1985 | int err; |
1986 | |
1987 | /* start from scratch */ |
1988 | err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); |
1989 | if (err < 0) { |
1990 | dprintk("RPC: can't create TCP transport socket (%d).\n", |
1991 | -err); |
1992 | goto out_err; |
1993 | } |
1994 | xs_reclassify_socket6(sock); |
1995 | |
1996 | if (xs_bind6(transport, sock) < 0) { |
1997 | sock_release(sock); |
1998 | goto out_err; |
1999 | } |
2000 | return sock; |
2001 | out_err: |
2002 | return ERR_PTR(-EIO); |
2003 | } |
2004 | |
2005 | /** |
2006 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint |
2007 | * @work: RPC transport to connect |
2008 | * |
2009 | * Invoked by a work queue tasklet. |
2010 | */ |
2011 | static void xs_tcp_connect_worker6(struct work_struct *work) |
2012 | { |
2013 | struct sock_xprt *transport = |
2014 | container_of(work, struct sock_xprt, connect_worker.work); |
2015 | struct rpc_xprt *xprt = &transport->xprt; |
2016 | |
2017 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); |
2018 | } |
2019 | |
2020 | /** |
2021 | * xs_connect - connect a socket to a remote endpoint |
2022 | * @task: address of RPC task that manages state of connect request |
2023 | * |
2024 | * TCP: If the remote end dropped the connection, delay reconnecting. |
2025 | * |
2026 | * UDP socket connects are synchronous, but we use a work queue anyway |
2027 | * to guarantee that even unprivileged user processes can set up a |
2028 | * socket on a privileged port. |
2029 | * |
2030 | * If a UDP socket connect fails, the delay behavior here prevents |
2031 | * retry floods (hard mounts). |
2032 | */ |
2033 | static void xs_connect(struct rpc_task *task) |
2034 | { |
2035 | struct rpc_xprt *xprt = task->tk_xprt; |
2036 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2037 | |
2038 | if (xprt_test_and_set_connecting(xprt)) |
2039 | return; |
2040 | |
2041 | if (transport->sock != NULL) { |
2042 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2043 | "seconds\n", |
2044 | xprt, xprt->reestablish_timeout / HZ); |
2045 | queue_delayed_work(rpciod_workqueue, |
2046 | &transport->connect_worker, |
2047 | xprt->reestablish_timeout); |
2048 | xprt->reestablish_timeout <<= 1; |
2049 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2050 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2051 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2052 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; |
2053 | } else { |
2054 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
2055 | queue_delayed_work(rpciod_workqueue, |
2056 | &transport->connect_worker, 0); |
2057 | } |
2058 | } |
2059 | |
2060 | static void xs_tcp_connect(struct rpc_task *task) |
2061 | { |
2062 | struct rpc_xprt *xprt = task->tk_xprt; |
2063 | |
2064 | /* Exit if we need to wait for socket shutdown to complete */ |
2065 | if (test_bit(XPRT_CLOSING, &xprt->state)) |
2066 | return; |
2067 | xs_connect(task); |
2068 | } |
2069 | |
2070 | /** |
2071 | * xs_udp_print_stats - display UDP socket-specifc stats |
2072 | * @xprt: rpc_xprt struct containing statistics |
2073 | * @seq: output file |
2074 | * |
2075 | */ |
2076 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
2077 | { |
2078 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2079 | |
2080 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
2081 | transport->srcport, |
2082 | xprt->stat.bind_count, |
2083 | xprt->stat.sends, |
2084 | xprt->stat.recvs, |
2085 | xprt->stat.bad_xids, |
2086 | xprt->stat.req_u, |
2087 | xprt->stat.bklog_u); |
2088 | } |
2089 | |
2090 | /** |
2091 | * xs_tcp_print_stats - display TCP socket-specifc stats |
2092 | * @xprt: rpc_xprt struct containing statistics |
2093 | * @seq: output file |
2094 | * |
2095 | */ |
2096 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
2097 | { |
2098 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2099 | long idle_time = 0; |
2100 | |
2101 | if (xprt_connected(xprt)) |
2102 | idle_time = (long)(jiffies - xprt->last_used) / HZ; |
2103 | |
2104 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", |
2105 | transport->srcport, |
2106 | xprt->stat.bind_count, |
2107 | xprt->stat.connect_count, |
2108 | xprt->stat.connect_time, |
2109 | idle_time, |
2110 | xprt->stat.sends, |
2111 | xprt->stat.recvs, |
2112 | xprt->stat.bad_xids, |
2113 | xprt->stat.req_u, |
2114 | xprt->stat.bklog_u); |
2115 | } |
2116 | |
2117 | /* |
2118 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason |
2119 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want |
2120 | * to use the server side send routines. |
2121 | */ |
2122 | void *bc_malloc(struct rpc_task *task, size_t size) |
2123 | { |
2124 | struct page *page; |
2125 | struct rpc_buffer *buf; |
2126 | |
2127 | BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); |
2128 | page = alloc_page(GFP_KERNEL); |
2129 | |
2130 | if (!page) |
2131 | return NULL; |
2132 | |
2133 | buf = page_address(page); |
2134 | buf->len = PAGE_SIZE; |
2135 | |
2136 | return buf->data; |
2137 | } |
2138 | |
2139 | /* |
2140 | * Free the space allocated in the bc_alloc routine |
2141 | */ |
2142 | void bc_free(void *buffer) |
2143 | { |
2144 | struct rpc_buffer *buf; |
2145 | |
2146 | if (!buffer) |
2147 | return; |
2148 | |
2149 | buf = container_of(buffer, struct rpc_buffer, data); |
2150 | free_page((unsigned long)buf); |
2151 | } |
2152 | |
2153 | /* |
2154 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex |
2155 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. |
2156 | */ |
2157 | static int bc_sendto(struct rpc_rqst *req) |
2158 | { |
2159 | int len; |
2160 | struct xdr_buf *xbufp = &req->rq_snd_buf; |
2161 | struct rpc_xprt *xprt = req->rq_xprt; |
2162 | struct sock_xprt *transport = |
2163 | container_of(xprt, struct sock_xprt, xprt); |
2164 | struct socket *sock = transport->sock; |
2165 | unsigned long headoff; |
2166 | unsigned long tailoff; |
2167 | |
2168 | /* |
2169 | * Set up the rpc header and record marker stuff |
2170 | */ |
2171 | xs_encode_tcp_record_marker(xbufp); |
2172 | |
2173 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; |
2174 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; |
2175 | len = svc_send_common(sock, xbufp, |
2176 | virt_to_page(xbufp->head[0].iov_base), headoff, |
2177 | xbufp->tail[0].iov_base, tailoff); |
2178 | |
2179 | if (len != xbufp->len) { |
2180 | printk(KERN_NOTICE "Error sending entire callback!\n"); |
2181 | len = -EAGAIN; |
2182 | } |
2183 | |
2184 | return len; |
2185 | } |
2186 | |
2187 | /* |
2188 | * The send routine. Borrows from svc_send |
2189 | */ |
2190 | static int bc_send_request(struct rpc_task *task) |
2191 | { |
2192 | struct rpc_rqst *req = task->tk_rqstp; |
2193 | struct svc_xprt *xprt; |
2194 | struct svc_sock *svsk; |
2195 | u32 len; |
2196 | |
2197 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); |
2198 | /* |
2199 | * Get the server socket associated with this callback xprt |
2200 | */ |
2201 | xprt = req->rq_xprt->bc_xprt; |
2202 | svsk = container_of(xprt, struct svc_sock, sk_xprt); |
2203 | |
2204 | /* |
2205 | * Grab the mutex to serialize data as the connection is shared |
2206 | * with the fore channel |
2207 | */ |
2208 | if (!mutex_trylock(&xprt->xpt_mutex)) { |
2209 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); |
2210 | if (!mutex_trylock(&xprt->xpt_mutex)) |
2211 | return -EAGAIN; |
2212 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); |
2213 | } |
2214 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) |
2215 | len = -ENOTCONN; |
2216 | else |
2217 | len = bc_sendto(req); |
2218 | mutex_unlock(&xprt->xpt_mutex); |
2219 | |
2220 | if (len > 0) |
2221 | len = 0; |
2222 | |
2223 | return len; |
2224 | } |
2225 | |
2226 | /* |
2227 | * The close routine. Since this is client initiated, we do nothing |
2228 | */ |
2229 | |
2230 | static void bc_close(struct rpc_xprt *xprt) |
2231 | { |
2232 | return; |
2233 | } |
2234 | |
2235 | /* |
2236 | * The xprt destroy routine. Again, because this connection is client |
2237 | * initiated, we do nothing |
2238 | */ |
2239 | |
2240 | static void bc_destroy(struct rpc_xprt *xprt) |
2241 | { |
2242 | return; |
2243 | } |
2244 | |
2245 | static struct rpc_xprt_ops xs_udp_ops = { |
2246 | .set_buffer_size = xs_udp_set_buffer_size, |
2247 | .reserve_xprt = xprt_reserve_xprt_cong, |
2248 | .release_xprt = xprt_release_xprt_cong, |
2249 | .rpcbind = rpcb_getport_async, |
2250 | .set_port = xs_set_port, |
2251 | .connect = xs_connect, |
2252 | .buf_alloc = rpc_malloc, |
2253 | .buf_free = rpc_free, |
2254 | .send_request = xs_udp_send_request, |
2255 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
2256 | .timer = xs_udp_timer, |
2257 | .release_request = xprt_release_rqst_cong, |
2258 | .close = xs_close, |
2259 | .destroy = xs_destroy, |
2260 | .print_stats = xs_udp_print_stats, |
2261 | }; |
2262 | |
2263 | static struct rpc_xprt_ops xs_tcp_ops = { |
2264 | .reserve_xprt = xprt_reserve_xprt, |
2265 | .release_xprt = xs_tcp_release_xprt, |
2266 | .rpcbind = rpcb_getport_async, |
2267 | .set_port = xs_set_port, |
2268 | .connect = xs_tcp_connect, |
2269 | .buf_alloc = rpc_malloc, |
2270 | .buf_free = rpc_free, |
2271 | .send_request = xs_tcp_send_request, |
2272 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
2273 | #if defined(CONFIG_NFS_V4_1) |
2274 | .release_request = bc_release_request, |
2275 | #endif /* CONFIG_NFS_V4_1 */ |
2276 | .close = xs_tcp_close, |
2277 | .destroy = xs_destroy, |
2278 | .print_stats = xs_tcp_print_stats, |
2279 | }; |
2280 | |
2281 | /* |
2282 | * The rpc_xprt_ops for the server backchannel |
2283 | */ |
2284 | |
2285 | static struct rpc_xprt_ops bc_tcp_ops = { |
2286 | .reserve_xprt = xprt_reserve_xprt, |
2287 | .release_xprt = xprt_release_xprt, |
2288 | .buf_alloc = bc_malloc, |
2289 | .buf_free = bc_free, |
2290 | .send_request = bc_send_request, |
2291 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
2292 | .close = bc_close, |
2293 | .destroy = bc_destroy, |
2294 | .print_stats = xs_tcp_print_stats, |
2295 | }; |
2296 | |
2297 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
2298 | unsigned int slot_table_size) |
2299 | { |
2300 | struct rpc_xprt *xprt; |
2301 | struct sock_xprt *new; |
2302 | |
2303 | if (args->addrlen > sizeof(xprt->addr)) { |
2304 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
2305 | return ERR_PTR(-EBADF); |
2306 | } |
2307 | |
2308 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
2309 | if (new == NULL) { |
2310 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2311 | "rpc_xprt\n"); |
2312 | return ERR_PTR(-ENOMEM); |
2313 | } |
2314 | xprt = &new->xprt; |
2315 | |
2316 | xprt->max_reqs = slot_table_size; |
2317 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); |
2318 | if (xprt->slot == NULL) { |
2319 | kfree(xprt); |
2320 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
2321 | "table\n"); |
2322 | return ERR_PTR(-ENOMEM); |
2323 | } |
2324 | |
2325 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2326 | xprt->addrlen = args->addrlen; |
2327 | if (args->srcaddr) |
2328 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
2329 | |
2330 | return xprt; |
2331 | } |
2332 | |
2333 | static const struct rpc_timeout xs_udp_default_timeout = { |
2334 | .to_initval = 5 * HZ, |
2335 | .to_maxval = 30 * HZ, |
2336 | .to_increment = 5 * HZ, |
2337 | .to_retries = 5, |
2338 | }; |
2339 | |
2340 | /** |
2341 | * xs_setup_udp - Set up transport to use a UDP socket |
2342 | * @args: rpc transport creation arguments |
2343 | * |
2344 | */ |
2345 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
2346 | { |
2347 | struct sockaddr *addr = args->dstaddr; |
2348 | struct rpc_xprt *xprt; |
2349 | struct sock_xprt *transport; |
2350 | |
2351 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
2352 | if (IS_ERR(xprt)) |
2353 | return xprt; |
2354 | transport = container_of(xprt, struct sock_xprt, xprt); |
2355 | |
2356 | xprt->prot = IPPROTO_UDP; |
2357 | xprt->tsh_size = 0; |
2358 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2359 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); |
2360 | |
2361 | xprt->bind_timeout = XS_BIND_TO; |
2362 | xprt->connect_timeout = XS_UDP_CONN_TO; |
2363 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2364 | xprt->idle_timeout = XS_IDLE_DISC_TO; |
2365 | |
2366 | xprt->ops = &xs_udp_ops; |
2367 | |
2368 | xprt->timeout = &xs_udp_default_timeout; |
2369 | |
2370 | switch (addr->sa_family) { |
2371 | case AF_INET: |
2372 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) |
2373 | xprt_set_bound(xprt); |
2374 | |
2375 | INIT_DELAYED_WORK(&transport->connect_worker, |
2376 | xs_udp_connect_worker4); |
2377 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
2378 | break; |
2379 | case AF_INET6: |
2380 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) |
2381 | xprt_set_bound(xprt); |
2382 | |
2383 | INIT_DELAYED_WORK(&transport->connect_worker, |
2384 | xs_udp_connect_worker6); |
2385 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
2386 | break; |
2387 | default: |
2388 | kfree(xprt); |
2389 | return ERR_PTR(-EAFNOSUPPORT); |
2390 | } |
2391 | |
2392 | if (xprt_bound(xprt)) |
2393 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2394 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2395 | xprt->address_strings[RPC_DISPLAY_PORT], |
2396 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2397 | else |
2398 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", |
2399 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2400 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2401 | |
2402 | if (try_module_get(THIS_MODULE)) |
2403 | return xprt; |
2404 | |
2405 | kfree(xprt->slot); |
2406 | kfree(xprt); |
2407 | return ERR_PTR(-EINVAL); |
2408 | } |
2409 | |
2410 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2411 | .to_initval = 60 * HZ, |
2412 | .to_maxval = 60 * HZ, |
2413 | .to_retries = 2, |
2414 | }; |
2415 | |
2416 | /** |
2417 | * xs_setup_tcp - Set up transport to use a TCP socket |
2418 | * @args: rpc transport creation arguments |
2419 | * |
2420 | */ |
2421 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
2422 | { |
2423 | struct sockaddr *addr = args->dstaddr; |
2424 | struct rpc_xprt *xprt; |
2425 | struct sock_xprt *transport; |
2426 | |
2427 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
2428 | if (IS_ERR(xprt)) |
2429 | return xprt; |
2430 | transport = container_of(xprt, struct sock_xprt, xprt); |
2431 | |
2432 | xprt->prot = IPPROTO_TCP; |
2433 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
2434 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
2435 | |
2436 | xprt->bind_timeout = XS_BIND_TO; |
2437 | xprt->connect_timeout = XS_TCP_CONN_TO; |
2438 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2439 | xprt->idle_timeout = XS_IDLE_DISC_TO; |
2440 | |
2441 | xprt->ops = &xs_tcp_ops; |
2442 | xprt->timeout = &xs_tcp_default_timeout; |
2443 | |
2444 | switch (addr->sa_family) { |
2445 | case AF_INET: |
2446 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) |
2447 | xprt_set_bound(xprt); |
2448 | |
2449 | INIT_DELAYED_WORK(&transport->connect_worker, |
2450 | xs_tcp_connect_worker4); |
2451 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
2452 | break; |
2453 | case AF_INET6: |
2454 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) |
2455 | xprt_set_bound(xprt); |
2456 | |
2457 | INIT_DELAYED_WORK(&transport->connect_worker, |
2458 | xs_tcp_connect_worker6); |
2459 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
2460 | break; |
2461 | default: |
2462 | kfree(xprt); |
2463 | return ERR_PTR(-EAFNOSUPPORT); |
2464 | } |
2465 | |
2466 | if (xprt_bound(xprt)) |
2467 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2468 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2469 | xprt->address_strings[RPC_DISPLAY_PORT], |
2470 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2471 | else |
2472 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", |
2473 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2474 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2475 | |
2476 | |
2477 | if (try_module_get(THIS_MODULE)) |
2478 | return xprt; |
2479 | |
2480 | kfree(xprt->slot); |
2481 | kfree(xprt); |
2482 | return ERR_PTR(-EINVAL); |
2483 | } |
2484 | |
2485 | /** |
2486 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket |
2487 | * @args: rpc transport creation arguments |
2488 | * |
2489 | */ |
2490 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) |
2491 | { |
2492 | struct sockaddr *addr = args->dstaddr; |
2493 | struct rpc_xprt *xprt; |
2494 | struct sock_xprt *transport; |
2495 | struct svc_sock *bc_sock; |
2496 | |
2497 | if (!args->bc_xprt) |
2498 | ERR_PTR(-EINVAL); |
2499 | |
2500 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
2501 | if (IS_ERR(xprt)) |
2502 | return xprt; |
2503 | transport = container_of(xprt, struct sock_xprt, xprt); |
2504 | |
2505 | xprt->prot = IPPROTO_TCP; |
2506 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
2507 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
2508 | xprt->timeout = &xs_tcp_default_timeout; |
2509 | |
2510 | /* backchannel */ |
2511 | xprt_set_bound(xprt); |
2512 | xprt->bind_timeout = 0; |
2513 | xprt->connect_timeout = 0; |
2514 | xprt->reestablish_timeout = 0; |
2515 | xprt->idle_timeout = 0; |
2516 | |
2517 | /* |
2518 | * The backchannel uses the same socket connection as the |
2519 | * forechannel |
2520 | */ |
2521 | xprt->bc_xprt = args->bc_xprt; |
2522 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); |
2523 | bc_sock->sk_bc_xprt = xprt; |
2524 | transport->sock = bc_sock->sk_sock; |
2525 | transport->inet = bc_sock->sk_sk; |
2526 | |
2527 | xprt->ops = &bc_tcp_ops; |
2528 | |
2529 | switch (addr->sa_family) { |
2530 | case AF_INET: |
2531 | xs_format_peer_addresses(xprt, "tcp", |
2532 | RPCBIND_NETID_TCP); |
2533 | break; |
2534 | case AF_INET6: |
2535 | xs_format_peer_addresses(xprt, "tcp", |
2536 | RPCBIND_NETID_TCP6); |
2537 | break; |
2538 | default: |
2539 | kfree(xprt); |
2540 | return ERR_PTR(-EAFNOSUPPORT); |
2541 | } |
2542 | |
2543 | if (xprt_bound(xprt)) |
2544 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2545 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2546 | xprt->address_strings[RPC_DISPLAY_PORT], |
2547 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2548 | else |
2549 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", |
2550 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2551 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2552 | |
2553 | /* |
2554 | * Since we don't want connections for the backchannel, we set |
2555 | * the xprt status to connected |
2556 | */ |
2557 | xprt_set_connected(xprt); |
2558 | |
2559 | |
2560 | if (try_module_get(THIS_MODULE)) |
2561 | return xprt; |
2562 | kfree(xprt->slot); |
2563 | kfree(xprt); |
2564 | return ERR_PTR(-EINVAL); |
2565 | } |
2566 | |
2567 | static struct xprt_class xs_udp_transport = { |
2568 | .list = LIST_HEAD_INIT(xs_udp_transport.list), |
2569 | .name = "udp", |
2570 | .owner = THIS_MODULE, |
2571 | .ident = XPRT_TRANSPORT_UDP, |
2572 | .setup = xs_setup_udp, |
2573 | }; |
2574 | |
2575 | static struct xprt_class xs_tcp_transport = { |
2576 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), |
2577 | .name = "tcp", |
2578 | .owner = THIS_MODULE, |
2579 | .ident = XPRT_TRANSPORT_TCP, |
2580 | .setup = xs_setup_tcp, |
2581 | }; |
2582 | |
2583 | static struct xprt_class xs_bc_tcp_transport = { |
2584 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), |
2585 | .name = "tcp NFSv4.1 backchannel", |
2586 | .owner = THIS_MODULE, |
2587 | .ident = XPRT_TRANSPORT_BC_TCP, |
2588 | .setup = xs_setup_bc_tcp, |
2589 | }; |
2590 | |
2591 | /** |
2592 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
2593 | * |
2594 | */ |
2595 | int init_socket_xprt(void) |
2596 | { |
2597 | #ifdef RPC_DEBUG |
2598 | if (!sunrpc_table_header) |
2599 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
2600 | #endif |
2601 | |
2602 | xprt_register_transport(&xs_udp_transport); |
2603 | xprt_register_transport(&xs_tcp_transport); |
2604 | xprt_register_transport(&xs_bc_tcp_transport); |
2605 | |
2606 | return 0; |
2607 | } |
2608 | |
2609 | /** |
2610 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
2611 | * |
2612 | */ |
2613 | void cleanup_socket_xprt(void) |
2614 | { |
2615 | #ifdef RPC_DEBUG |
2616 | if (sunrpc_table_header) { |
2617 | unregister_sysctl_table(sunrpc_table_header); |
2618 | sunrpc_table_header = NULL; |
2619 | } |
2620 | #endif |
2621 | |
2622 | xprt_unregister_transport(&xs_udp_transport); |
2623 | xprt_unregister_transport(&xs_tcp_transport); |
2624 | xprt_unregister_transport(&xs_bc_tcp_transport); |
2625 | } |
2626 | |
2627 | static int param_set_uint_minmax(const char *val, struct kernel_param *kp, |
2628 | unsigned int min, unsigned int max) |
2629 | { |
2630 | unsigned long num; |
2631 | int ret; |
2632 | |
2633 | if (!val) |
2634 | return -EINVAL; |
2635 | ret = strict_strtoul(val, 0, &num); |
2636 | if (ret == -EINVAL || num < min || num > max) |
2637 | return -EINVAL; |
2638 | *((unsigned int *)kp->arg) = num; |
2639 | return 0; |
2640 | } |
2641 | |
2642 | static int param_set_portnr(const char *val, struct kernel_param *kp) |
2643 | { |
2644 | return param_set_uint_minmax(val, kp, |
2645 | RPC_MIN_RESVPORT, |
2646 | RPC_MAX_RESVPORT); |
2647 | } |
2648 | |
2649 | static int param_get_portnr(char *buffer, struct kernel_param *kp) |
2650 | { |
2651 | return param_get_uint(buffer, kp); |
2652 | } |
2653 | #define param_check_portnr(name, p) \ |
2654 | __param_check(name, p, unsigned int); |
2655 | |
2656 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); |
2657 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); |
2658 | |
2659 | static int param_set_slot_table_size(const char *val, struct kernel_param *kp) |
2660 | { |
2661 | return param_set_uint_minmax(val, kp, |
2662 | RPC_MIN_SLOT_TABLE, |
2663 | RPC_MAX_SLOT_TABLE); |
2664 | } |
2665 | |
2666 | static int param_get_slot_table_size(char *buffer, struct kernel_param *kp) |
2667 | { |
2668 | return param_get_uint(buffer, kp); |
2669 | } |
2670 | #define param_check_slot_table_size(name, p) \ |
2671 | __param_check(name, p, unsigned int); |
2672 | |
2673 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
2674 | slot_table_size, 0644); |
2675 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
2676 | slot_table_size, 0644); |
2677 | |
2678 |
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