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1 | /* |
2 | * linux/net/sunrpc/xprtsock.c |
3 | * |
4 | * Client-side transport implementation for sockets. |
5 | * |
6 | * TCP callback races fixes (C) 1998 Red Hat |
7 | * TCP send fixes (C) 1998 Red Hat |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> |
10 | * |
11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. |
12 | * Fix behaviour when socket buffer is full. |
13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. |
18 | * <gilles.quillard@bull.net> |
19 | */ |
20 | |
21 | #include <linux/types.h> |
22 | #include <linux/string.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/module.h> |
25 | #include <linux/capability.h> |
26 | #include <linux/pagemap.h> |
27 | #include <linux/errno.h> |
28 | #include <linux/socket.h> |
29 | #include <linux/in.h> |
30 | #include <linux/net.h> |
31 | #include <linux/mm.h> |
32 | #include <linux/un.h> |
33 | #include <linux/udp.h> |
34 | #include <linux/tcp.h> |
35 | #include <linux/sunrpc/clnt.h> |
36 | #include <linux/sunrpc/addr.h> |
37 | #include <linux/sunrpc/sched.h> |
38 | #include <linux/sunrpc/svcsock.h> |
39 | #include <linux/sunrpc/xprtsock.h> |
40 | #include <linux/file.h> |
41 | #ifdef CONFIG_SUNRPC_BACKCHANNEL |
42 | #include <linux/sunrpc/bc_xprt.h> |
43 | #endif |
44 | |
45 | #include <net/sock.h> |
46 | #include <net/checksum.h> |
47 | #include <net/udp.h> |
48 | #include <net/tcp.h> |
49 | |
50 | #include <trace/events/sunrpc.h> |
51 | |
52 | #include "sunrpc.h" |
53 | |
54 | static void xs_close(struct rpc_xprt *xprt); |
55 | |
56 | /* |
57 | * xprtsock tunables |
58 | */ |
59 | static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
60 | static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; |
61 | static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; |
62 | |
63 | static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; |
64 | static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; |
65 | |
66 | #define XS_TCP_LINGER_TO (15U * HZ) |
67 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
68 | |
69 | /* |
70 | * We can register our own files under /proc/sys/sunrpc by |
71 | * calling register_sysctl_table() again. The files in that |
72 | * directory become the union of all files registered there. |
73 | * |
74 | * We simply need to make sure that we don't collide with |
75 | * someone else's file names! |
76 | */ |
77 | |
78 | #ifdef RPC_DEBUG |
79 | |
80 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; |
81 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; |
82 | static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; |
83 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; |
84 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; |
85 | |
86 | static struct ctl_table_header *sunrpc_table_header; |
87 | |
88 | /* |
89 | * FIXME: changing the UDP slot table size should also resize the UDP |
90 | * socket buffers for existing UDP transports |
91 | */ |
92 | static struct ctl_table xs_tunables_table[] = { |
93 | { |
94 | .procname = "udp_slot_table_entries", |
95 | .data = &xprt_udp_slot_table_entries, |
96 | .maxlen = sizeof(unsigned int), |
97 | .mode = 0644, |
98 | .proc_handler = proc_dointvec_minmax, |
99 | .extra1 = &min_slot_table_size, |
100 | .extra2 = &max_slot_table_size |
101 | }, |
102 | { |
103 | .procname = "tcp_slot_table_entries", |
104 | .data = &xprt_tcp_slot_table_entries, |
105 | .maxlen = sizeof(unsigned int), |
106 | .mode = 0644, |
107 | .proc_handler = proc_dointvec_minmax, |
108 | .extra1 = &min_slot_table_size, |
109 | .extra2 = &max_slot_table_size |
110 | }, |
111 | { |
112 | .procname = "tcp_max_slot_table_entries", |
113 | .data = &xprt_max_tcp_slot_table_entries, |
114 | .maxlen = sizeof(unsigned int), |
115 | .mode = 0644, |
116 | .proc_handler = proc_dointvec_minmax, |
117 | .extra1 = &min_slot_table_size, |
118 | .extra2 = &max_tcp_slot_table_limit |
119 | }, |
120 | { |
121 | .procname = "min_resvport", |
122 | .data = &xprt_min_resvport, |
123 | .maxlen = sizeof(unsigned int), |
124 | .mode = 0644, |
125 | .proc_handler = proc_dointvec_minmax, |
126 | .extra1 = &xprt_min_resvport_limit, |
127 | .extra2 = &xprt_max_resvport_limit |
128 | }, |
129 | { |
130 | .procname = "max_resvport", |
131 | .data = &xprt_max_resvport, |
132 | .maxlen = sizeof(unsigned int), |
133 | .mode = 0644, |
134 | .proc_handler = proc_dointvec_minmax, |
135 | .extra1 = &xprt_min_resvport_limit, |
136 | .extra2 = &xprt_max_resvport_limit |
137 | }, |
138 | { |
139 | .procname = "tcp_fin_timeout", |
140 | .data = &xs_tcp_fin_timeout, |
141 | .maxlen = sizeof(xs_tcp_fin_timeout), |
142 | .mode = 0644, |
143 | .proc_handler = proc_dointvec_jiffies, |
144 | }, |
145 | { }, |
146 | }; |
147 | |
148 | static struct ctl_table sunrpc_table[] = { |
149 | { |
150 | .procname = "sunrpc", |
151 | .mode = 0555, |
152 | .child = xs_tunables_table |
153 | }, |
154 | { }, |
155 | }; |
156 | |
157 | #endif |
158 | |
159 | /* |
160 | * Wait duration for a reply from the RPC portmapper. |
161 | */ |
162 | #define XS_BIND_TO (60U * HZ) |
163 | |
164 | /* |
165 | * Delay if a UDP socket connect error occurs. This is most likely some |
166 | * kind of resource problem on the local host. |
167 | */ |
168 | #define XS_UDP_REEST_TO (2U * HZ) |
169 | |
170 | /* |
171 | * The reestablish timeout allows clients to delay for a bit before attempting |
172 | * to reconnect to a server that just dropped our connection. |
173 | * |
174 | * We implement an exponential backoff when trying to reestablish a TCP |
175 | * transport connection with the server. Some servers like to drop a TCP |
176 | * connection when they are overworked, so we start with a short timeout and |
177 | * increase over time if the server is down or not responding. |
178 | */ |
179 | #define XS_TCP_INIT_REEST_TO (3U * HZ) |
180 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) |
181 | |
182 | /* |
183 | * TCP idle timeout; client drops the transport socket if it is idle |
184 | * for this long. Note that we also timeout UDP sockets to prevent |
185 | * holding port numbers when there is no RPC traffic. |
186 | */ |
187 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) |
188 | |
189 | #ifdef RPC_DEBUG |
190 | # undef RPC_DEBUG_DATA |
191 | # define RPCDBG_FACILITY RPCDBG_TRANS |
192 | #endif |
193 | |
194 | #ifdef RPC_DEBUG_DATA |
195 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
196 | { |
197 | u8 *buf = (u8 *) packet; |
198 | int j; |
199 | |
200 | dprintk("RPC: %s\n", msg); |
201 | for (j = 0; j < count && j < 128; j += 4) { |
202 | if (!(j & 31)) { |
203 | if (j) |
204 | dprintk("\n"); |
205 | dprintk("0x%04x ", j); |
206 | } |
207 | dprintk("%02x%02x%02x%02x ", |
208 | buf[j], buf[j+1], buf[j+2], buf[j+3]); |
209 | } |
210 | dprintk("\n"); |
211 | } |
212 | #else |
213 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
214 | { |
215 | /* NOP */ |
216 | } |
217 | #endif |
218 | |
219 | struct sock_xprt { |
220 | struct rpc_xprt xprt; |
221 | |
222 | /* |
223 | * Network layer |
224 | */ |
225 | struct socket * sock; |
226 | struct sock * inet; |
227 | |
228 | /* |
229 | * State of TCP reply receive |
230 | */ |
231 | __be32 tcp_fraghdr, |
232 | tcp_xid, |
233 | tcp_calldir; |
234 | |
235 | u32 tcp_offset, |
236 | tcp_reclen; |
237 | |
238 | unsigned long tcp_copied, |
239 | tcp_flags; |
240 | |
241 | /* |
242 | * Connection of transports |
243 | */ |
244 | struct delayed_work connect_worker; |
245 | struct sockaddr_storage srcaddr; |
246 | unsigned short srcport; |
247 | |
248 | /* |
249 | * UDP socket buffer size parameters |
250 | */ |
251 | size_t rcvsize, |
252 | sndsize; |
253 | |
254 | /* |
255 | * Saved socket callback addresses |
256 | */ |
257 | void (*old_data_ready)(struct sock *); |
258 | void (*old_state_change)(struct sock *); |
259 | void (*old_write_space)(struct sock *); |
260 | void (*old_error_report)(struct sock *); |
261 | }; |
262 | |
263 | /* |
264 | * TCP receive state flags |
265 | */ |
266 | #define TCP_RCV_LAST_FRAG (1UL << 0) |
267 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) |
268 | #define TCP_RCV_COPY_XID (1UL << 2) |
269 | #define TCP_RCV_COPY_DATA (1UL << 3) |
270 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
271 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) |
272 | |
273 | /* |
274 | * TCP RPC flags |
275 | */ |
276 | #define TCP_RPC_REPLY (1UL << 6) |
277 | |
278 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
279 | { |
280 | return (struct rpc_xprt *) sk->sk_user_data; |
281 | } |
282 | |
283 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
284 | { |
285 | return (struct sockaddr *) &xprt->addr; |
286 | } |
287 | |
288 | static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) |
289 | { |
290 | return (struct sockaddr_un *) &xprt->addr; |
291 | } |
292 | |
293 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
294 | { |
295 | return (struct sockaddr_in *) &xprt->addr; |
296 | } |
297 | |
298 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) |
299 | { |
300 | return (struct sockaddr_in6 *) &xprt->addr; |
301 | } |
302 | |
303 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
304 | { |
305 | struct sockaddr *sap = xs_addr(xprt); |
306 | struct sockaddr_in6 *sin6; |
307 | struct sockaddr_in *sin; |
308 | struct sockaddr_un *sun; |
309 | char buf[128]; |
310 | |
311 | switch (sap->sa_family) { |
312 | case AF_LOCAL: |
313 | sun = xs_addr_un(xprt); |
314 | strlcpy(buf, sun->sun_path, sizeof(buf)); |
315 | xprt->address_strings[RPC_DISPLAY_ADDR] = |
316 | kstrdup(buf, GFP_KERNEL); |
317 | break; |
318 | case AF_INET: |
319 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
320 | xprt->address_strings[RPC_DISPLAY_ADDR] = |
321 | kstrdup(buf, GFP_KERNEL); |
322 | sin = xs_addr_in(xprt); |
323 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
324 | break; |
325 | case AF_INET6: |
326 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
327 | xprt->address_strings[RPC_DISPLAY_ADDR] = |
328 | kstrdup(buf, GFP_KERNEL); |
329 | sin6 = xs_addr_in6(xprt); |
330 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
331 | break; |
332 | default: |
333 | BUG(); |
334 | } |
335 | |
336 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
337 | } |
338 | |
339 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
340 | { |
341 | struct sockaddr *sap = xs_addr(xprt); |
342 | char buf[128]; |
343 | |
344 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
345 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
346 | |
347 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
348 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
349 | } |
350 | |
351 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
352 | const char *protocol, |
353 | const char *netid) |
354 | { |
355 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
356 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
357 | xs_format_common_peer_addresses(xprt); |
358 | xs_format_common_peer_ports(xprt); |
359 | } |
360 | |
361 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
362 | { |
363 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
364 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); |
365 | |
366 | xs_format_common_peer_ports(xprt); |
367 | } |
368 | |
369 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) |
370 | { |
371 | unsigned int i; |
372 | |
373 | for (i = 0; i < RPC_DISPLAY_MAX; i++) |
374 | switch (i) { |
375 | case RPC_DISPLAY_PROTO: |
376 | case RPC_DISPLAY_NETID: |
377 | continue; |
378 | default: |
379 | kfree(xprt->address_strings[i]); |
380 | } |
381 | } |
382 | |
383 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
384 | |
385 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
386 | { |
387 | struct msghdr msg = { |
388 | .msg_name = addr, |
389 | .msg_namelen = addrlen, |
390 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
391 | }; |
392 | struct kvec iov = { |
393 | .iov_base = vec->iov_base + base, |
394 | .iov_len = vec->iov_len - base, |
395 | }; |
396 | |
397 | if (iov.iov_len != 0) |
398 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
399 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); |
400 | } |
401 | |
402 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy) |
403 | { |
404 | ssize_t (*do_sendpage)(struct socket *sock, struct page *page, |
405 | int offset, size_t size, int flags); |
406 | struct page **ppage; |
407 | unsigned int remainder; |
408 | int err, sent = 0; |
409 | |
410 | remainder = xdr->page_len - base; |
411 | base += xdr->page_base; |
412 | ppage = xdr->pages + (base >> PAGE_SHIFT); |
413 | base &= ~PAGE_MASK; |
414 | do_sendpage = sock->ops->sendpage; |
415 | if (!zerocopy) |
416 | do_sendpage = sock_no_sendpage; |
417 | for(;;) { |
418 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); |
419 | int flags = XS_SENDMSG_FLAGS; |
420 | |
421 | remainder -= len; |
422 | if (remainder != 0 || more) |
423 | flags |= MSG_MORE; |
424 | err = do_sendpage(sock, *ppage, base, len, flags); |
425 | if (remainder == 0 || err != len) |
426 | break; |
427 | sent += err; |
428 | ppage++; |
429 | base = 0; |
430 | } |
431 | if (sent == 0) |
432 | return err; |
433 | if (err > 0) |
434 | sent += err; |
435 | return sent; |
436 | } |
437 | |
438 | /** |
439 | * xs_sendpages - write pages directly to a socket |
440 | * @sock: socket to send on |
441 | * @addr: UDP only -- address of destination |
442 | * @addrlen: UDP only -- length of destination address |
443 | * @xdr: buffer containing this request |
444 | * @base: starting position in the buffer |
445 | * @zerocopy: true if it is safe to use sendpage() |
446 | * |
447 | */ |
448 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy) |
449 | { |
450 | unsigned int remainder = xdr->len - base; |
451 | int err, sent = 0; |
452 | |
453 | if (unlikely(!sock)) |
454 | return -ENOTSOCK; |
455 | |
456 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); |
457 | if (base != 0) { |
458 | addr = NULL; |
459 | addrlen = 0; |
460 | } |
461 | |
462 | if (base < xdr->head[0].iov_len || addr != NULL) { |
463 | unsigned int len = xdr->head[0].iov_len - base; |
464 | remainder -= len; |
465 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); |
466 | if (remainder == 0 || err != len) |
467 | goto out; |
468 | sent += err; |
469 | base = 0; |
470 | } else |
471 | base -= xdr->head[0].iov_len; |
472 | |
473 | if (base < xdr->page_len) { |
474 | unsigned int len = xdr->page_len - base; |
475 | remainder -= len; |
476 | err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy); |
477 | if (remainder == 0 || err != len) |
478 | goto out; |
479 | sent += err; |
480 | base = 0; |
481 | } else |
482 | base -= xdr->page_len; |
483 | |
484 | if (base >= xdr->tail[0].iov_len) |
485 | return sent; |
486 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); |
487 | out: |
488 | if (sent == 0) |
489 | return err; |
490 | if (err > 0) |
491 | sent += err; |
492 | return sent; |
493 | } |
494 | |
495 | static void xs_nospace_callback(struct rpc_task *task) |
496 | { |
497 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); |
498 | |
499 | transport->inet->sk_write_pending--; |
500 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
501 | } |
502 | |
503 | /** |
504 | * xs_nospace - place task on wait queue if transmit was incomplete |
505 | * @task: task to put to sleep |
506 | * |
507 | */ |
508 | static int xs_nospace(struct rpc_task *task) |
509 | { |
510 | struct rpc_rqst *req = task->tk_rqstp; |
511 | struct rpc_xprt *xprt = req->rq_xprt; |
512 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
513 | struct sock *sk = transport->inet; |
514 | int ret = -EAGAIN; |
515 | |
516 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
517 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
518 | req->rq_slen); |
519 | |
520 | /* Protect against races with write_space */ |
521 | spin_lock_bh(&xprt->transport_lock); |
522 | |
523 | /* Don't race with disconnect */ |
524 | if (xprt_connected(xprt)) { |
525 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { |
526 | /* |
527 | * Notify TCP that we're limited by the application |
528 | * window size |
529 | */ |
530 | set_bit(SOCK_NOSPACE, &transport->sock->flags); |
531 | sk->sk_write_pending++; |
532 | /* ...and wait for more buffer space */ |
533 | xprt_wait_for_buffer_space(task, xs_nospace_callback); |
534 | } |
535 | } else { |
536 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
537 | ret = -ENOTCONN; |
538 | } |
539 | |
540 | spin_unlock_bh(&xprt->transport_lock); |
541 | |
542 | /* Race breaker in case memory is freed before above code is called */ |
543 | sk->sk_write_space(sk); |
544 | return ret; |
545 | } |
546 | |
547 | /* |
548 | * Construct a stream transport record marker in @buf. |
549 | */ |
550 | static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) |
551 | { |
552 | u32 reclen = buf->len - sizeof(rpc_fraghdr); |
553 | rpc_fraghdr *base = buf->head[0].iov_base; |
554 | *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); |
555 | } |
556 | |
557 | /** |
558 | * xs_local_send_request - write an RPC request to an AF_LOCAL socket |
559 | * @task: RPC task that manages the state of an RPC request |
560 | * |
561 | * Return values: |
562 | * 0: The request has been sent |
563 | * EAGAIN: The socket was blocked, please call again later to |
564 | * complete the request |
565 | * ENOTCONN: Caller needs to invoke connect logic then call again |
566 | * other: Some other error occured, the request was not sent |
567 | */ |
568 | static int xs_local_send_request(struct rpc_task *task) |
569 | { |
570 | struct rpc_rqst *req = task->tk_rqstp; |
571 | struct rpc_xprt *xprt = req->rq_xprt; |
572 | struct sock_xprt *transport = |
573 | container_of(xprt, struct sock_xprt, xprt); |
574 | struct xdr_buf *xdr = &req->rq_snd_buf; |
575 | int status; |
576 | |
577 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
578 | |
579 | xs_pktdump("packet data:", |
580 | req->rq_svec->iov_base, req->rq_svec->iov_len); |
581 | |
582 | status = xs_sendpages(transport->sock, NULL, 0, |
583 | xdr, req->rq_bytes_sent, true); |
584 | dprintk("RPC: %s(%u) = %d\n", |
585 | __func__, xdr->len - req->rq_bytes_sent, status); |
586 | if (likely(status >= 0)) { |
587 | req->rq_bytes_sent += status; |
588 | req->rq_xmit_bytes_sent += status; |
589 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
590 | req->rq_bytes_sent = 0; |
591 | return 0; |
592 | } |
593 | status = -EAGAIN; |
594 | } |
595 | |
596 | switch (status) { |
597 | case -EAGAIN: |
598 | status = xs_nospace(task); |
599 | break; |
600 | default: |
601 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
602 | -status); |
603 | case -EPIPE: |
604 | xs_close(xprt); |
605 | status = -ENOTCONN; |
606 | } |
607 | |
608 | return status; |
609 | } |
610 | |
611 | /** |
612 | * xs_udp_send_request - write an RPC request to a UDP socket |
613 | * @task: address of RPC task that manages the state of an RPC request |
614 | * |
615 | * Return values: |
616 | * 0: The request has been sent |
617 | * EAGAIN: The socket was blocked, please call again later to |
618 | * complete the request |
619 | * ENOTCONN: Caller needs to invoke connect logic then call again |
620 | * other: Some other error occurred, the request was not sent |
621 | */ |
622 | static int xs_udp_send_request(struct rpc_task *task) |
623 | { |
624 | struct rpc_rqst *req = task->tk_rqstp; |
625 | struct rpc_xprt *xprt = req->rq_xprt; |
626 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
627 | struct xdr_buf *xdr = &req->rq_snd_buf; |
628 | int status; |
629 | |
630 | xs_pktdump("packet data:", |
631 | req->rq_svec->iov_base, |
632 | req->rq_svec->iov_len); |
633 | |
634 | if (!xprt_bound(xprt)) |
635 | return -ENOTCONN; |
636 | status = xs_sendpages(transport->sock, |
637 | xs_addr(xprt), |
638 | xprt->addrlen, xdr, |
639 | req->rq_bytes_sent, true); |
640 | |
641 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
642 | xdr->len - req->rq_bytes_sent, status); |
643 | |
644 | if (status >= 0) { |
645 | req->rq_xmit_bytes_sent += status; |
646 | if (status >= req->rq_slen) |
647 | return 0; |
648 | /* Still some bytes left; set up for a retry later. */ |
649 | status = -EAGAIN; |
650 | } |
651 | |
652 | switch (status) { |
653 | case -ENOTSOCK: |
654 | status = -ENOTCONN; |
655 | /* Should we call xs_close() here? */ |
656 | break; |
657 | case -EAGAIN: |
658 | status = xs_nospace(task); |
659 | break; |
660 | default: |
661 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
662 | -status); |
663 | case -ENETUNREACH: |
664 | case -EPIPE: |
665 | case -ECONNREFUSED: |
666 | /* When the server has died, an ICMP port unreachable message |
667 | * prompts ECONNREFUSED. */ |
668 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
669 | } |
670 | |
671 | return status; |
672 | } |
673 | |
674 | /** |
675 | * xs_tcp_shutdown - gracefully shut down a TCP socket |
676 | * @xprt: transport |
677 | * |
678 | * Initiates a graceful shutdown of the TCP socket by calling the |
679 | * equivalent of shutdown(SHUT_WR); |
680 | */ |
681 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) |
682 | { |
683 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
684 | struct socket *sock = transport->sock; |
685 | |
686 | if (sock != NULL) { |
687 | kernel_sock_shutdown(sock, SHUT_WR); |
688 | trace_rpc_socket_shutdown(xprt, sock); |
689 | } |
690 | } |
691 | |
692 | /** |
693 | * xs_tcp_send_request - write an RPC request to a TCP socket |
694 | * @task: address of RPC task that manages the state of an RPC request |
695 | * |
696 | * Return values: |
697 | * 0: The request has been sent |
698 | * EAGAIN: The socket was blocked, please call again later to |
699 | * complete the request |
700 | * ENOTCONN: Caller needs to invoke connect logic then call again |
701 | * other: Some other error occurred, the request was not sent |
702 | * |
703 | * XXX: In the case of soft timeouts, should we eventually give up |
704 | * if sendmsg is not able to make progress? |
705 | */ |
706 | static int xs_tcp_send_request(struct rpc_task *task) |
707 | { |
708 | struct rpc_rqst *req = task->tk_rqstp; |
709 | struct rpc_xprt *xprt = req->rq_xprt; |
710 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
711 | struct xdr_buf *xdr = &req->rq_snd_buf; |
712 | bool zerocopy = true; |
713 | int status; |
714 | |
715 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
716 | |
717 | xs_pktdump("packet data:", |
718 | req->rq_svec->iov_base, |
719 | req->rq_svec->iov_len); |
720 | /* Don't use zero copy if this is a resend. If the RPC call |
721 | * completes while the socket holds a reference to the pages, |
722 | * then we may end up resending corrupted data. |
723 | */ |
724 | if (task->tk_flags & RPC_TASK_SENT) |
725 | zerocopy = false; |
726 | |
727 | /* Continue transmitting the packet/record. We must be careful |
728 | * to cope with writespace callbacks arriving _after_ we have |
729 | * called sendmsg(). */ |
730 | while (1) { |
731 | status = xs_sendpages(transport->sock, |
732 | NULL, 0, xdr, req->rq_bytes_sent, |
733 | zerocopy); |
734 | |
735 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
736 | xdr->len - req->rq_bytes_sent, status); |
737 | |
738 | if (unlikely(status < 0)) |
739 | break; |
740 | |
741 | /* If we've sent the entire packet, immediately |
742 | * reset the count of bytes sent. */ |
743 | req->rq_bytes_sent += status; |
744 | req->rq_xmit_bytes_sent += status; |
745 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
746 | req->rq_bytes_sent = 0; |
747 | return 0; |
748 | } |
749 | |
750 | if (status != 0) |
751 | continue; |
752 | status = -EAGAIN; |
753 | break; |
754 | } |
755 | |
756 | switch (status) { |
757 | case -ENOTSOCK: |
758 | status = -ENOTCONN; |
759 | /* Should we call xs_close() here? */ |
760 | break; |
761 | case -EAGAIN: |
762 | status = xs_nospace(task); |
763 | break; |
764 | default: |
765 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
766 | -status); |
767 | case -ECONNRESET: |
768 | xs_tcp_shutdown(xprt); |
769 | case -ECONNREFUSED: |
770 | case -ENOTCONN: |
771 | case -EPIPE: |
772 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
773 | } |
774 | |
775 | return status; |
776 | } |
777 | |
778 | /** |
779 | * xs_tcp_release_xprt - clean up after a tcp transmission |
780 | * @xprt: transport |
781 | * @task: rpc task |
782 | * |
783 | * This cleans up if an error causes us to abort the transmission of a request. |
784 | * In this case, the socket may need to be reset in order to avoid confusing |
785 | * the server. |
786 | */ |
787 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
788 | { |
789 | struct rpc_rqst *req; |
790 | |
791 | if (task != xprt->snd_task) |
792 | return; |
793 | if (task == NULL) |
794 | goto out_release; |
795 | req = task->tk_rqstp; |
796 | if (req == NULL) |
797 | goto out_release; |
798 | if (req->rq_bytes_sent == 0) |
799 | goto out_release; |
800 | if (req->rq_bytes_sent == req->rq_snd_buf.len) |
801 | goto out_release; |
802 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
803 | out_release: |
804 | xprt_release_xprt(xprt, task); |
805 | } |
806 | |
807 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
808 | { |
809 | transport->old_data_ready = sk->sk_data_ready; |
810 | transport->old_state_change = sk->sk_state_change; |
811 | transport->old_write_space = sk->sk_write_space; |
812 | transport->old_error_report = sk->sk_error_report; |
813 | } |
814 | |
815 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
816 | { |
817 | sk->sk_data_ready = transport->old_data_ready; |
818 | sk->sk_state_change = transport->old_state_change; |
819 | sk->sk_write_space = transport->old_write_space; |
820 | sk->sk_error_report = transport->old_error_report; |
821 | } |
822 | |
823 | /** |
824 | * xs_error_report - callback to handle TCP socket state errors |
825 | * @sk: socket |
826 | * |
827 | * Note: we don't call sock_error() since there may be a rpc_task |
828 | * using the socket, and so we don't want to clear sk->sk_err. |
829 | */ |
830 | static void xs_error_report(struct sock *sk) |
831 | { |
832 | struct rpc_xprt *xprt; |
833 | int err; |
834 | |
835 | read_lock_bh(&sk->sk_callback_lock); |
836 | if (!(xprt = xprt_from_sock(sk))) |
837 | goto out; |
838 | |
839 | err = -sk->sk_err; |
840 | if (err == 0) |
841 | goto out; |
842 | dprintk("RPC: xs_error_report client %p, error=%d...\n", |
843 | xprt, -err); |
844 | trace_rpc_socket_error(xprt, sk->sk_socket, err); |
845 | xprt_wake_pending_tasks(xprt, err); |
846 | out: |
847 | read_unlock_bh(&sk->sk_callback_lock); |
848 | } |
849 | |
850 | static void xs_reset_transport(struct sock_xprt *transport) |
851 | { |
852 | struct socket *sock = transport->sock; |
853 | struct sock *sk = transport->inet; |
854 | |
855 | if (sk == NULL) |
856 | return; |
857 | |
858 | transport->srcport = 0; |
859 | |
860 | write_lock_bh(&sk->sk_callback_lock); |
861 | transport->inet = NULL; |
862 | transport->sock = NULL; |
863 | |
864 | sk->sk_user_data = NULL; |
865 | |
866 | xs_restore_old_callbacks(transport, sk); |
867 | write_unlock_bh(&sk->sk_callback_lock); |
868 | |
869 | sk->sk_no_check = 0; |
870 | |
871 | trace_rpc_socket_close(&transport->xprt, sock); |
872 | sock_release(sock); |
873 | } |
874 | |
875 | /** |
876 | * xs_close - close a socket |
877 | * @xprt: transport |
878 | * |
879 | * This is used when all requests are complete; ie, no DRC state remains |
880 | * on the server we want to save. |
881 | * |
882 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with |
883 | * xs_reset_transport() zeroing the socket from underneath a writer. |
884 | */ |
885 | static void xs_close(struct rpc_xprt *xprt) |
886 | { |
887 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
888 | |
889 | dprintk("RPC: xs_close xprt %p\n", xprt); |
890 | |
891 | cancel_delayed_work_sync(&transport->connect_worker); |
892 | |
893 | xs_reset_transport(transport); |
894 | xprt->reestablish_timeout = 0; |
895 | |
896 | smp_mb__before_clear_bit(); |
897 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
898 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
899 | clear_bit(XPRT_CLOSING, &xprt->state); |
900 | smp_mb__after_clear_bit(); |
901 | xprt_disconnect_done(xprt); |
902 | } |
903 | |
904 | static void xs_tcp_close(struct rpc_xprt *xprt) |
905 | { |
906 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) |
907 | xs_close(xprt); |
908 | else |
909 | xs_tcp_shutdown(xprt); |
910 | } |
911 | |
912 | static void xs_xprt_free(struct rpc_xprt *xprt) |
913 | { |
914 | xs_free_peer_addresses(xprt); |
915 | xprt_free(xprt); |
916 | } |
917 | |
918 | /** |
919 | * xs_destroy - prepare to shutdown a transport |
920 | * @xprt: doomed transport |
921 | * |
922 | */ |
923 | static void xs_destroy(struct rpc_xprt *xprt) |
924 | { |
925 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
926 | |
927 | xs_close(xprt); |
928 | xs_xprt_free(xprt); |
929 | module_put(THIS_MODULE); |
930 | } |
931 | |
932 | static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) |
933 | { |
934 | struct xdr_skb_reader desc = { |
935 | .skb = skb, |
936 | .offset = sizeof(rpc_fraghdr), |
937 | .count = skb->len - sizeof(rpc_fraghdr), |
938 | }; |
939 | |
940 | if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) |
941 | return -1; |
942 | if (desc.count) |
943 | return -1; |
944 | return 0; |
945 | } |
946 | |
947 | /** |
948 | * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets |
949 | * @sk: socket with data to read |
950 | * @len: how much data to read |
951 | * |
952 | * Currently this assumes we can read the whole reply in a single gulp. |
953 | */ |
954 | static void xs_local_data_ready(struct sock *sk) |
955 | { |
956 | struct rpc_task *task; |
957 | struct rpc_xprt *xprt; |
958 | struct rpc_rqst *rovr; |
959 | struct sk_buff *skb; |
960 | int err, repsize, copied; |
961 | u32 _xid; |
962 | __be32 *xp; |
963 | |
964 | read_lock_bh(&sk->sk_callback_lock); |
965 | dprintk("RPC: %s...\n", __func__); |
966 | xprt = xprt_from_sock(sk); |
967 | if (xprt == NULL) |
968 | goto out; |
969 | |
970 | skb = skb_recv_datagram(sk, 0, 1, &err); |
971 | if (skb == NULL) |
972 | goto out; |
973 | |
974 | repsize = skb->len - sizeof(rpc_fraghdr); |
975 | if (repsize < 4) { |
976 | dprintk("RPC: impossible RPC reply size %d\n", repsize); |
977 | goto dropit; |
978 | } |
979 | |
980 | /* Copy the XID from the skb... */ |
981 | xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); |
982 | if (xp == NULL) |
983 | goto dropit; |
984 | |
985 | /* Look up and lock the request corresponding to the given XID */ |
986 | spin_lock(&xprt->transport_lock); |
987 | rovr = xprt_lookup_rqst(xprt, *xp); |
988 | if (!rovr) |
989 | goto out_unlock; |
990 | task = rovr->rq_task; |
991 | |
992 | copied = rovr->rq_private_buf.buflen; |
993 | if (copied > repsize) |
994 | copied = repsize; |
995 | |
996 | if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
997 | dprintk("RPC: sk_buff copy failed\n"); |
998 | goto out_unlock; |
999 | } |
1000 | |
1001 | xprt_complete_rqst(task, copied); |
1002 | |
1003 | out_unlock: |
1004 | spin_unlock(&xprt->transport_lock); |
1005 | dropit: |
1006 | skb_free_datagram(sk, skb); |
1007 | out: |
1008 | read_unlock_bh(&sk->sk_callback_lock); |
1009 | } |
1010 | |
1011 | /** |
1012 | * xs_udp_data_ready - "data ready" callback for UDP sockets |
1013 | * @sk: socket with data to read |
1014 | * @len: how much data to read |
1015 | * |
1016 | */ |
1017 | static void xs_udp_data_ready(struct sock *sk) |
1018 | { |
1019 | struct rpc_task *task; |
1020 | struct rpc_xprt *xprt; |
1021 | struct rpc_rqst *rovr; |
1022 | struct sk_buff *skb; |
1023 | int err, repsize, copied; |
1024 | u32 _xid; |
1025 | __be32 *xp; |
1026 | |
1027 | read_lock_bh(&sk->sk_callback_lock); |
1028 | dprintk("RPC: xs_udp_data_ready...\n"); |
1029 | if (!(xprt = xprt_from_sock(sk))) |
1030 | goto out; |
1031 | |
1032 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) |
1033 | goto out; |
1034 | |
1035 | repsize = skb->len - sizeof(struct udphdr); |
1036 | if (repsize < 4) { |
1037 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
1038 | goto dropit; |
1039 | } |
1040 | |
1041 | /* Copy the XID from the skb... */ |
1042 | xp = skb_header_pointer(skb, sizeof(struct udphdr), |
1043 | sizeof(_xid), &_xid); |
1044 | if (xp == NULL) |
1045 | goto dropit; |
1046 | |
1047 | /* Look up and lock the request corresponding to the given XID */ |
1048 | spin_lock(&xprt->transport_lock); |
1049 | rovr = xprt_lookup_rqst(xprt, *xp); |
1050 | if (!rovr) |
1051 | goto out_unlock; |
1052 | task = rovr->rq_task; |
1053 | |
1054 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
1055 | copied = repsize; |
1056 | |
1057 | /* Suck it into the iovec, verify checksum if not done by hw. */ |
1058 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
1059 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); |
1060 | goto out_unlock; |
1061 | } |
1062 | |
1063 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); |
1064 | |
1065 | xprt_adjust_cwnd(xprt, task, copied); |
1066 | xprt_complete_rqst(task, copied); |
1067 | |
1068 | out_unlock: |
1069 | spin_unlock(&xprt->transport_lock); |
1070 | dropit: |
1071 | skb_free_datagram(sk, skb); |
1072 | out: |
1073 | read_unlock_bh(&sk->sk_callback_lock); |
1074 | } |
1075 | |
1076 | /* |
1077 | * Helper function to force a TCP close if the server is sending |
1078 | * junk and/or it has put us in CLOSE_WAIT |
1079 | */ |
1080 | static void xs_tcp_force_close(struct rpc_xprt *xprt) |
1081 | { |
1082 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
1083 | xprt_force_disconnect(xprt); |
1084 | } |
1085 | |
1086 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
1087 | { |
1088 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1089 | size_t len, used; |
1090 | char *p; |
1091 | |
1092 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
1093 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; |
1094 | used = xdr_skb_read_bits(desc, p, len); |
1095 | transport->tcp_offset += used; |
1096 | if (used != len) |
1097 | return; |
1098 | |
1099 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
1100 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) |
1101 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
1102 | else |
1103 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
1104 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
1105 | |
1106 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
1107 | transport->tcp_offset = 0; |
1108 | |
1109 | /* Sanity check of the record length */ |
1110 | if (unlikely(transport->tcp_reclen < 8)) { |
1111 | dprintk("RPC: invalid TCP record fragment length\n"); |
1112 | xs_tcp_force_close(xprt); |
1113 | return; |
1114 | } |
1115 | dprintk("RPC: reading TCP record fragment of length %d\n", |
1116 | transport->tcp_reclen); |
1117 | } |
1118 | |
1119 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
1120 | { |
1121 | if (transport->tcp_offset == transport->tcp_reclen) { |
1122 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
1123 | transport->tcp_offset = 0; |
1124 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
1125 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1126 | transport->tcp_flags |= TCP_RCV_COPY_XID; |
1127 | transport->tcp_copied = 0; |
1128 | } |
1129 | } |
1130 | } |
1131 | |
1132 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
1133 | { |
1134 | size_t len, used; |
1135 | char *p; |
1136 | |
1137 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
1138 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
1139 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
1140 | used = xdr_skb_read_bits(desc, p, len); |
1141 | transport->tcp_offset += used; |
1142 | if (used != len) |
1143 | return; |
1144 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
1145 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
1146 | transport->tcp_copied = 4; |
1147 | dprintk("RPC: reading %s XID %08x\n", |
1148 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" |
1149 | : "request with", |
1150 | ntohl(transport->tcp_xid)); |
1151 | xs_tcp_check_fraghdr(transport); |
1152 | } |
1153 | |
1154 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1155 | struct xdr_skb_reader *desc) |
1156 | { |
1157 | size_t len, used; |
1158 | u32 offset; |
1159 | char *p; |
1160 | |
1161 | /* |
1162 | * We want transport->tcp_offset to be 8 at the end of this routine |
1163 | * (4 bytes for the xid and 4 bytes for the call/reply flag). |
1164 | * When this function is called for the first time, |
1165 | * transport->tcp_offset is 4 (after having already read the xid). |
1166 | */ |
1167 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); |
1168 | len = sizeof(transport->tcp_calldir) - offset; |
1169 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
1170 | p = ((char *) &transport->tcp_calldir) + offset; |
1171 | used = xdr_skb_read_bits(desc, p, len); |
1172 | transport->tcp_offset += used; |
1173 | if (used != len) |
1174 | return; |
1175 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
1176 | /* |
1177 | * We don't yet have the XDR buffer, so we will write the calldir |
1178 | * out after we get the buffer from the 'struct rpc_rqst' |
1179 | */ |
1180 | switch (ntohl(transport->tcp_calldir)) { |
1181 | case RPC_REPLY: |
1182 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; |
1183 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
1184 | transport->tcp_flags |= TCP_RPC_REPLY; |
1185 | break; |
1186 | case RPC_CALL: |
1187 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; |
1188 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
1189 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
1190 | break; |
1191 | default: |
1192 | dprintk("RPC: invalid request message type\n"); |
1193 | xs_tcp_force_close(&transport->xprt); |
1194 | } |
1195 | xs_tcp_check_fraghdr(transport); |
1196 | } |
1197 | |
1198 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1199 | struct xdr_skb_reader *desc, |
1200 | struct rpc_rqst *req) |
1201 | { |
1202 | struct sock_xprt *transport = |
1203 | container_of(xprt, struct sock_xprt, xprt); |
1204 | struct xdr_buf *rcvbuf; |
1205 | size_t len; |
1206 | ssize_t r; |
1207 | |
1208 | rcvbuf = &req->rq_private_buf; |
1209 | |
1210 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { |
1211 | /* |
1212 | * Save the RPC direction in the XDR buffer |
1213 | */ |
1214 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
1215 | &transport->tcp_calldir, |
1216 | sizeof(transport->tcp_calldir)); |
1217 | transport->tcp_copied += sizeof(transport->tcp_calldir); |
1218 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
1219 | } |
1220 | |
1221 | len = desc->count; |
1222 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
1223 | struct xdr_skb_reader my_desc; |
1224 | |
1225 | len = transport->tcp_reclen - transport->tcp_offset; |
1226 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1227 | my_desc.count = len; |
1228 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
1229 | &my_desc, xdr_skb_read_bits); |
1230 | desc->count -= r; |
1231 | desc->offset += r; |
1232 | } else |
1233 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
1234 | desc, xdr_skb_read_bits); |
1235 | |
1236 | if (r > 0) { |
1237 | transport->tcp_copied += r; |
1238 | transport->tcp_offset += r; |
1239 | } |
1240 | if (r != len) { |
1241 | /* Error when copying to the receive buffer, |
1242 | * usually because we weren't able to allocate |
1243 | * additional buffer pages. All we can do now |
1244 | * is turn off TCP_RCV_COPY_DATA, so the request |
1245 | * will not receive any additional updates, |
1246 | * and time out. |
1247 | * Any remaining data from this record will |
1248 | * be discarded. |
1249 | */ |
1250 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1251 | dprintk("RPC: XID %08x truncated request\n", |
1252 | ntohl(transport->tcp_xid)); |
1253 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1254 | "tcp_offset = %u, tcp_reclen = %u\n", |
1255 | xprt, transport->tcp_copied, |
1256 | transport->tcp_offset, transport->tcp_reclen); |
1257 | return; |
1258 | } |
1259 | |
1260 | dprintk("RPC: XID %08x read %Zd bytes\n", |
1261 | ntohl(transport->tcp_xid), r); |
1262 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1263 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, |
1264 | transport->tcp_offset, transport->tcp_reclen); |
1265 | |
1266 | if (transport->tcp_copied == req->rq_private_buf.buflen) |
1267 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1268 | else if (transport->tcp_offset == transport->tcp_reclen) { |
1269 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1270 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1271 | } |
1272 | } |
1273 | |
1274 | /* |
1275 | * Finds the request corresponding to the RPC xid and invokes the common |
1276 | * tcp read code to read the data. |
1277 | */ |
1278 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, |
1279 | struct xdr_skb_reader *desc) |
1280 | { |
1281 | struct sock_xprt *transport = |
1282 | container_of(xprt, struct sock_xprt, xprt); |
1283 | struct rpc_rqst *req; |
1284 | |
1285 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); |
1286 | |
1287 | /* Find and lock the request corresponding to this xid */ |
1288 | spin_lock(&xprt->transport_lock); |
1289 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
1290 | if (!req) { |
1291 | dprintk("RPC: XID %08x request not found!\n", |
1292 | ntohl(transport->tcp_xid)); |
1293 | spin_unlock(&xprt->transport_lock); |
1294 | return -1; |
1295 | } |
1296 | |
1297 | xs_tcp_read_common(xprt, desc, req); |
1298 | |
1299 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
1300 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
1301 | |
1302 | spin_unlock(&xprt->transport_lock); |
1303 | return 0; |
1304 | } |
1305 | |
1306 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
1307 | /* |
1308 | * Obtains an rpc_rqst previously allocated and invokes the common |
1309 | * tcp read code to read the data. The result is placed in the callback |
1310 | * queue. |
1311 | * If we're unable to obtain the rpc_rqst we schedule the closing of the |
1312 | * connection and return -1. |
1313 | */ |
1314 | static int xs_tcp_read_callback(struct rpc_xprt *xprt, |
1315 | struct xdr_skb_reader *desc) |
1316 | { |
1317 | struct sock_xprt *transport = |
1318 | container_of(xprt, struct sock_xprt, xprt); |
1319 | struct rpc_rqst *req; |
1320 | |
1321 | /* Look up and lock the request corresponding to the given XID */ |
1322 | spin_lock(&xprt->transport_lock); |
1323 | req = xprt_lookup_bc_request(xprt, transport->tcp_xid); |
1324 | if (req == NULL) { |
1325 | spin_unlock(&xprt->transport_lock); |
1326 | printk(KERN_WARNING "Callback slot table overflowed\n"); |
1327 | xprt_force_disconnect(xprt); |
1328 | return -1; |
1329 | } |
1330 | |
1331 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); |
1332 | xs_tcp_read_common(xprt, desc, req); |
1333 | |
1334 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
1335 | xprt_complete_bc_request(req, transport->tcp_copied); |
1336 | spin_unlock(&xprt->transport_lock); |
1337 | |
1338 | return 0; |
1339 | } |
1340 | |
1341 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, |
1342 | struct xdr_skb_reader *desc) |
1343 | { |
1344 | struct sock_xprt *transport = |
1345 | container_of(xprt, struct sock_xprt, xprt); |
1346 | |
1347 | return (transport->tcp_flags & TCP_RPC_REPLY) ? |
1348 | xs_tcp_read_reply(xprt, desc) : |
1349 | xs_tcp_read_callback(xprt, desc); |
1350 | } |
1351 | #else |
1352 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, |
1353 | struct xdr_skb_reader *desc) |
1354 | { |
1355 | return xs_tcp_read_reply(xprt, desc); |
1356 | } |
1357 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
1358 | |
1359 | /* |
1360 | * Read data off the transport. This can be either an RPC_CALL or an |
1361 | * RPC_REPLY. Relay the processing to helper functions. |
1362 | */ |
1363 | static void xs_tcp_read_data(struct rpc_xprt *xprt, |
1364 | struct xdr_skb_reader *desc) |
1365 | { |
1366 | struct sock_xprt *transport = |
1367 | container_of(xprt, struct sock_xprt, xprt); |
1368 | |
1369 | if (_xs_tcp_read_data(xprt, desc) == 0) |
1370 | xs_tcp_check_fraghdr(transport); |
1371 | else { |
1372 | /* |
1373 | * The transport_lock protects the request handling. |
1374 | * There's no need to hold it to update the tcp_flags. |
1375 | */ |
1376 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
1377 | } |
1378 | } |
1379 | |
1380 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
1381 | { |
1382 | size_t len; |
1383 | |
1384 | len = transport->tcp_reclen - transport->tcp_offset; |
1385 | if (len > desc->count) |
1386 | len = desc->count; |
1387 | desc->count -= len; |
1388 | desc->offset += len; |
1389 | transport->tcp_offset += len; |
1390 | dprintk("RPC: discarded %Zu bytes\n", len); |
1391 | xs_tcp_check_fraghdr(transport); |
1392 | } |
1393 | |
1394 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
1395 | { |
1396 | struct rpc_xprt *xprt = rd_desc->arg.data; |
1397 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1398 | struct xdr_skb_reader desc = { |
1399 | .skb = skb, |
1400 | .offset = offset, |
1401 | .count = len, |
1402 | }; |
1403 | |
1404 | dprintk("RPC: xs_tcp_data_recv started\n"); |
1405 | do { |
1406 | /* Read in a new fragment marker if necessary */ |
1407 | /* Can we ever really expect to get completely empty fragments? */ |
1408 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
1409 | xs_tcp_read_fraghdr(xprt, &desc); |
1410 | continue; |
1411 | } |
1412 | /* Read in the xid if necessary */ |
1413 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
1414 | xs_tcp_read_xid(transport, &desc); |
1415 | continue; |
1416 | } |
1417 | /* Read in the call/reply flag */ |
1418 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
1419 | xs_tcp_read_calldir(transport, &desc); |
1420 | continue; |
1421 | } |
1422 | /* Read in the request data */ |
1423 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
1424 | xs_tcp_read_data(xprt, &desc); |
1425 | continue; |
1426 | } |
1427 | /* Skip over any trailing bytes on short reads */ |
1428 | xs_tcp_read_discard(transport, &desc); |
1429 | } while (desc.count); |
1430 | dprintk("RPC: xs_tcp_data_recv done\n"); |
1431 | return len - desc.count; |
1432 | } |
1433 | |
1434 | /** |
1435 | * xs_tcp_data_ready - "data ready" callback for TCP sockets |
1436 | * @sk: socket with data to read |
1437 | * @bytes: how much data to read |
1438 | * |
1439 | */ |
1440 | static void xs_tcp_data_ready(struct sock *sk) |
1441 | { |
1442 | struct rpc_xprt *xprt; |
1443 | read_descriptor_t rd_desc; |
1444 | int read; |
1445 | |
1446 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1447 | |
1448 | read_lock_bh(&sk->sk_callback_lock); |
1449 | if (!(xprt = xprt_from_sock(sk))) |
1450 | goto out; |
1451 | /* Any data means we had a useful conversation, so |
1452 | * the we don't need to delay the next reconnect |
1453 | */ |
1454 | if (xprt->reestablish_timeout) |
1455 | xprt->reestablish_timeout = 0; |
1456 | |
1457 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
1458 | rd_desc.arg.data = xprt; |
1459 | do { |
1460 | rd_desc.count = 65536; |
1461 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
1462 | } while (read > 0); |
1463 | out: |
1464 | read_unlock_bh(&sk->sk_callback_lock); |
1465 | } |
1466 | |
1467 | /* |
1468 | * Do the equivalent of linger/linger2 handling for dealing with |
1469 | * broken servers that don't close the socket in a timely |
1470 | * fashion |
1471 | */ |
1472 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, |
1473 | unsigned long timeout) |
1474 | { |
1475 | struct sock_xprt *transport; |
1476 | |
1477 | if (xprt_test_and_set_connecting(xprt)) |
1478 | return; |
1479 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1480 | transport = container_of(xprt, struct sock_xprt, xprt); |
1481 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, |
1482 | timeout); |
1483 | } |
1484 | |
1485 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) |
1486 | { |
1487 | struct sock_xprt *transport; |
1488 | |
1489 | transport = container_of(xprt, struct sock_xprt, xprt); |
1490 | |
1491 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || |
1492 | !cancel_delayed_work(&transport->connect_worker)) |
1493 | return; |
1494 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1495 | xprt_clear_connecting(xprt); |
1496 | } |
1497 | |
1498 | static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) |
1499 | { |
1500 | smp_mb__before_clear_bit(); |
1501 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1502 | clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
1503 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1504 | clear_bit(XPRT_CLOSING, &xprt->state); |
1505 | smp_mb__after_clear_bit(); |
1506 | } |
1507 | |
1508 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) |
1509 | { |
1510 | xs_sock_reset_connection_flags(xprt); |
1511 | /* Mark transport as closed and wake up all pending tasks */ |
1512 | xprt_disconnect_done(xprt); |
1513 | } |
1514 | |
1515 | /** |
1516 | * xs_tcp_state_change - callback to handle TCP socket state changes |
1517 | * @sk: socket whose state has changed |
1518 | * |
1519 | */ |
1520 | static void xs_tcp_state_change(struct sock *sk) |
1521 | { |
1522 | struct rpc_xprt *xprt; |
1523 | |
1524 | read_lock_bh(&sk->sk_callback_lock); |
1525 | if (!(xprt = xprt_from_sock(sk))) |
1526 | goto out; |
1527 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1528 | dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
1529 | sk->sk_state, xprt_connected(xprt), |
1530 | sock_flag(sk, SOCK_DEAD), |
1531 | sock_flag(sk, SOCK_ZAPPED), |
1532 | sk->sk_shutdown); |
1533 | |
1534 | trace_rpc_socket_state_change(xprt, sk->sk_socket); |
1535 | switch (sk->sk_state) { |
1536 | case TCP_ESTABLISHED: |
1537 | spin_lock(&xprt->transport_lock); |
1538 | if (!xprt_test_and_set_connected(xprt)) { |
1539 | struct sock_xprt *transport = container_of(xprt, |
1540 | struct sock_xprt, xprt); |
1541 | |
1542 | /* Reset TCP record info */ |
1543 | transport->tcp_offset = 0; |
1544 | transport->tcp_reclen = 0; |
1545 | transport->tcp_copied = 0; |
1546 | transport->tcp_flags = |
1547 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; |
1548 | xprt->connect_cookie++; |
1549 | |
1550 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
1551 | } |
1552 | spin_unlock(&xprt->transport_lock); |
1553 | break; |
1554 | case TCP_FIN_WAIT1: |
1555 | /* The client initiated a shutdown of the socket */ |
1556 | xprt->connect_cookie++; |
1557 | xprt->reestablish_timeout = 0; |
1558 | set_bit(XPRT_CLOSING, &xprt->state); |
1559 | smp_mb__before_clear_bit(); |
1560 | clear_bit(XPRT_CONNECTED, &xprt->state); |
1561 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1562 | smp_mb__after_clear_bit(); |
1563 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
1564 | break; |
1565 | case TCP_CLOSE_WAIT: |
1566 | /* The server initiated a shutdown of the socket */ |
1567 | xprt->connect_cookie++; |
1568 | clear_bit(XPRT_CONNECTED, &xprt->state); |
1569 | xs_tcp_force_close(xprt); |
1570 | case TCP_CLOSING: |
1571 | /* |
1572 | * If the server closed down the connection, make sure that |
1573 | * we back off before reconnecting |
1574 | */ |
1575 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
1576 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
1577 | break; |
1578 | case TCP_LAST_ACK: |
1579 | set_bit(XPRT_CLOSING, &xprt->state); |
1580 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
1581 | smp_mb__before_clear_bit(); |
1582 | clear_bit(XPRT_CONNECTED, &xprt->state); |
1583 | smp_mb__after_clear_bit(); |
1584 | break; |
1585 | case TCP_CLOSE: |
1586 | xs_tcp_cancel_linger_timeout(xprt); |
1587 | xs_sock_mark_closed(xprt); |
1588 | } |
1589 | out: |
1590 | read_unlock_bh(&sk->sk_callback_lock); |
1591 | } |
1592 | |
1593 | static void xs_write_space(struct sock *sk) |
1594 | { |
1595 | struct socket *sock; |
1596 | struct rpc_xprt *xprt; |
1597 | |
1598 | if (unlikely(!(sock = sk->sk_socket))) |
1599 | return; |
1600 | clear_bit(SOCK_NOSPACE, &sock->flags); |
1601 | |
1602 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
1603 | return; |
1604 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) |
1605 | return; |
1606 | |
1607 | xprt_write_space(xprt); |
1608 | } |
1609 | |
1610 | /** |
1611 | * xs_udp_write_space - callback invoked when socket buffer space |
1612 | * becomes available |
1613 | * @sk: socket whose state has changed |
1614 | * |
1615 | * Called when more output buffer space is available for this socket. |
1616 | * We try not to wake our writers until they can make "significant" |
1617 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
1618 | * with a bunch of small requests. |
1619 | */ |
1620 | static void xs_udp_write_space(struct sock *sk) |
1621 | { |
1622 | read_lock_bh(&sk->sk_callback_lock); |
1623 | |
1624 | /* from net/core/sock.c:sock_def_write_space */ |
1625 | if (sock_writeable(sk)) |
1626 | xs_write_space(sk); |
1627 | |
1628 | read_unlock_bh(&sk->sk_callback_lock); |
1629 | } |
1630 | |
1631 | /** |
1632 | * xs_tcp_write_space - callback invoked when socket buffer space |
1633 | * becomes available |
1634 | * @sk: socket whose state has changed |
1635 | * |
1636 | * Called when more output buffer space is available for this socket. |
1637 | * We try not to wake our writers until they can make "significant" |
1638 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
1639 | * with a bunch of small requests. |
1640 | */ |
1641 | static void xs_tcp_write_space(struct sock *sk) |
1642 | { |
1643 | read_lock_bh(&sk->sk_callback_lock); |
1644 | |
1645 | /* from net/core/stream.c:sk_stream_write_space */ |
1646 | if (sk_stream_is_writeable(sk)) |
1647 | xs_write_space(sk); |
1648 | |
1649 | read_unlock_bh(&sk->sk_callback_lock); |
1650 | } |
1651 | |
1652 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
1653 | { |
1654 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1655 | struct sock *sk = transport->inet; |
1656 | |
1657 | if (transport->rcvsize) { |
1658 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
1659 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
1660 | } |
1661 | if (transport->sndsize) { |
1662 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
1663 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
1664 | sk->sk_write_space(sk); |
1665 | } |
1666 | } |
1667 | |
1668 | /** |
1669 | * xs_udp_set_buffer_size - set send and receive limits |
1670 | * @xprt: generic transport |
1671 | * @sndsize: requested size of send buffer, in bytes |
1672 | * @rcvsize: requested size of receive buffer, in bytes |
1673 | * |
1674 | * Set socket send and receive buffer size limits. |
1675 | */ |
1676 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
1677 | { |
1678 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1679 | |
1680 | transport->sndsize = 0; |
1681 | if (sndsize) |
1682 | transport->sndsize = sndsize + 1024; |
1683 | transport->rcvsize = 0; |
1684 | if (rcvsize) |
1685 | transport->rcvsize = rcvsize + 1024; |
1686 | |
1687 | xs_udp_do_set_buffer_size(xprt); |
1688 | } |
1689 | |
1690 | /** |
1691 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport |
1692 | * @task: task that timed out |
1693 | * |
1694 | * Adjust the congestion window after a retransmit timeout has occurred. |
1695 | */ |
1696 | static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) |
1697 | { |
1698 | xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); |
1699 | } |
1700 | |
1701 | static unsigned short xs_get_random_port(void) |
1702 | { |
1703 | unsigned short range = xprt_max_resvport - xprt_min_resvport; |
1704 | unsigned short rand = (unsigned short) prandom_u32() % range; |
1705 | return rand + xprt_min_resvport; |
1706 | } |
1707 | |
1708 | /** |
1709 | * xs_set_port - reset the port number in the remote endpoint address |
1710 | * @xprt: generic transport |
1711 | * @port: new port number |
1712 | * |
1713 | */ |
1714 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) |
1715 | { |
1716 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
1717 | |
1718 | rpc_set_port(xs_addr(xprt), port); |
1719 | xs_update_peer_port(xprt); |
1720 | } |
1721 | |
1722 | static unsigned short xs_get_srcport(struct sock_xprt *transport) |
1723 | { |
1724 | unsigned short port = transport->srcport; |
1725 | |
1726 | if (port == 0 && transport->xprt.resvport) |
1727 | port = xs_get_random_port(); |
1728 | return port; |
1729 | } |
1730 | |
1731 | static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
1732 | { |
1733 | if (transport->srcport != 0) |
1734 | transport->srcport = 0; |
1735 | if (!transport->xprt.resvport) |
1736 | return 0; |
1737 | if (port <= xprt_min_resvport || port > xprt_max_resvport) |
1738 | return xprt_max_resvport; |
1739 | return --port; |
1740 | } |
1741 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
1742 | { |
1743 | struct sockaddr_storage myaddr; |
1744 | int err, nloop = 0; |
1745 | unsigned short port = xs_get_srcport(transport); |
1746 | unsigned short last; |
1747 | |
1748 | memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
1749 | do { |
1750 | rpc_set_port((struct sockaddr *)&myaddr, port); |
1751 | err = kernel_bind(sock, (struct sockaddr *)&myaddr, |
1752 | transport->xprt.addrlen); |
1753 | if (port == 0) |
1754 | break; |
1755 | if (err == 0) { |
1756 | transport->srcport = port; |
1757 | break; |
1758 | } |
1759 | last = port; |
1760 | port = xs_next_srcport(transport, port); |
1761 | if (port > last) |
1762 | nloop++; |
1763 | } while (err == -EADDRINUSE && nloop != 2); |
1764 | |
1765 | if (myaddr.ss_family == AF_INET) |
1766 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
1767 | &((struct sockaddr_in *)&myaddr)->sin_addr, |
1768 | port, err ? "failed" : "ok", err); |
1769 | else |
1770 | dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, |
1771 | &((struct sockaddr_in6 *)&myaddr)->sin6_addr, |
1772 | port, err ? "failed" : "ok", err); |
1773 | return err; |
1774 | } |
1775 | |
1776 | /* |
1777 | * We don't support autobind on AF_LOCAL sockets |
1778 | */ |
1779 | static void xs_local_rpcbind(struct rpc_task *task) |
1780 | { |
1781 | rcu_read_lock(); |
1782 | xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); |
1783 | rcu_read_unlock(); |
1784 | } |
1785 | |
1786 | static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) |
1787 | { |
1788 | } |
1789 | |
1790 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1791 | static struct lock_class_key xs_key[2]; |
1792 | static struct lock_class_key xs_slock_key[2]; |
1793 | |
1794 | static inline void xs_reclassify_socketu(struct socket *sock) |
1795 | { |
1796 | struct sock *sk = sock->sk; |
1797 | |
1798 | sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", |
1799 | &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); |
1800 | } |
1801 | |
1802 | static inline void xs_reclassify_socket4(struct socket *sock) |
1803 | { |
1804 | struct sock *sk = sock->sk; |
1805 | |
1806 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1807 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); |
1808 | } |
1809 | |
1810 | static inline void xs_reclassify_socket6(struct socket *sock) |
1811 | { |
1812 | struct sock *sk = sock->sk; |
1813 | |
1814 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1815 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); |
1816 | } |
1817 | |
1818 | static inline void xs_reclassify_socket(int family, struct socket *sock) |
1819 | { |
1820 | WARN_ON_ONCE(sock_owned_by_user(sock->sk)); |
1821 | if (sock_owned_by_user(sock->sk)) |
1822 | return; |
1823 | |
1824 | switch (family) { |
1825 | case AF_LOCAL: |
1826 | xs_reclassify_socketu(sock); |
1827 | break; |
1828 | case AF_INET: |
1829 | xs_reclassify_socket4(sock); |
1830 | break; |
1831 | case AF_INET6: |
1832 | xs_reclassify_socket6(sock); |
1833 | break; |
1834 | } |
1835 | } |
1836 | #else |
1837 | static inline void xs_reclassify_socketu(struct socket *sock) |
1838 | { |
1839 | } |
1840 | |
1841 | static inline void xs_reclassify_socket4(struct socket *sock) |
1842 | { |
1843 | } |
1844 | |
1845 | static inline void xs_reclassify_socket6(struct socket *sock) |
1846 | { |
1847 | } |
1848 | |
1849 | static inline void xs_reclassify_socket(int family, struct socket *sock) |
1850 | { |
1851 | } |
1852 | #endif |
1853 | |
1854 | static void xs_dummy_setup_socket(struct work_struct *work) |
1855 | { |
1856 | } |
1857 | |
1858 | static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
1859 | struct sock_xprt *transport, int family, int type, int protocol) |
1860 | { |
1861 | struct socket *sock; |
1862 | int err; |
1863 | |
1864 | err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
1865 | if (err < 0) { |
1866 | dprintk("RPC: can't create %d transport socket (%d).\n", |
1867 | protocol, -err); |
1868 | goto out; |
1869 | } |
1870 | xs_reclassify_socket(family, sock); |
1871 | |
1872 | err = xs_bind(transport, sock); |
1873 | if (err) { |
1874 | sock_release(sock); |
1875 | goto out; |
1876 | } |
1877 | |
1878 | return sock; |
1879 | out: |
1880 | return ERR_PTR(err); |
1881 | } |
1882 | |
1883 | static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
1884 | struct socket *sock) |
1885 | { |
1886 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, |
1887 | xprt); |
1888 | |
1889 | if (!transport->inet) { |
1890 | struct sock *sk = sock->sk; |
1891 | |
1892 | write_lock_bh(&sk->sk_callback_lock); |
1893 | |
1894 | xs_save_old_callbacks(transport, sk); |
1895 | |
1896 | sk->sk_user_data = xprt; |
1897 | sk->sk_data_ready = xs_local_data_ready; |
1898 | sk->sk_write_space = xs_udp_write_space; |
1899 | sk->sk_error_report = xs_error_report; |
1900 | sk->sk_allocation = GFP_ATOMIC; |
1901 | |
1902 | xprt_clear_connected(xprt); |
1903 | |
1904 | /* Reset to new socket */ |
1905 | transport->sock = sock; |
1906 | transport->inet = sk; |
1907 | |
1908 | write_unlock_bh(&sk->sk_callback_lock); |
1909 | } |
1910 | |
1911 | /* Tell the socket layer to start connecting... */ |
1912 | xprt->stat.connect_count++; |
1913 | xprt->stat.connect_start = jiffies; |
1914 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); |
1915 | } |
1916 | |
1917 | /** |
1918 | * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint |
1919 | * @xprt: RPC transport to connect |
1920 | * @transport: socket transport to connect |
1921 | * @create_sock: function to create a socket of the correct type |
1922 | */ |
1923 | static int xs_local_setup_socket(struct sock_xprt *transport) |
1924 | { |
1925 | struct rpc_xprt *xprt = &transport->xprt; |
1926 | struct socket *sock; |
1927 | int status = -EIO; |
1928 | |
1929 | current->flags |= PF_FSTRANS; |
1930 | |
1931 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1932 | status = __sock_create(xprt->xprt_net, AF_LOCAL, |
1933 | SOCK_STREAM, 0, &sock, 1); |
1934 | if (status < 0) { |
1935 | dprintk("RPC: can't create AF_LOCAL " |
1936 | "transport socket (%d).\n", -status); |
1937 | goto out; |
1938 | } |
1939 | xs_reclassify_socketu(sock); |
1940 | |
1941 | dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", |
1942 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); |
1943 | |
1944 | status = xs_local_finish_connecting(xprt, sock); |
1945 | trace_rpc_socket_connect(xprt, sock, status); |
1946 | switch (status) { |
1947 | case 0: |
1948 | dprintk("RPC: xprt %p connected to %s\n", |
1949 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); |
1950 | xprt_set_connected(xprt); |
1951 | break; |
1952 | case -ENOENT: |
1953 | dprintk("RPC: xprt %p: socket %s does not exist\n", |
1954 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); |
1955 | break; |
1956 | case -ECONNREFUSED: |
1957 | dprintk("RPC: xprt %p: connection refused for %s\n", |
1958 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); |
1959 | break; |
1960 | default: |
1961 | printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", |
1962 | __func__, -status, |
1963 | xprt->address_strings[RPC_DISPLAY_ADDR]); |
1964 | } |
1965 | |
1966 | out: |
1967 | xprt_clear_connecting(xprt); |
1968 | xprt_wake_pending_tasks(xprt, status); |
1969 | current->flags &= ~PF_FSTRANS; |
1970 | return status; |
1971 | } |
1972 | |
1973 | static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
1974 | { |
1975 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1976 | int ret; |
1977 | |
1978 | if (RPC_IS_ASYNC(task)) { |
1979 | /* |
1980 | * We want the AF_LOCAL connect to be resolved in the |
1981 | * filesystem namespace of the process making the rpc |
1982 | * call. Thus we connect synchronously. |
1983 | * |
1984 | * If we want to support asynchronous AF_LOCAL calls, |
1985 | * we'll need to figure out how to pass a namespace to |
1986 | * connect. |
1987 | */ |
1988 | rpc_exit(task, -ENOTCONN); |
1989 | return; |
1990 | } |
1991 | ret = xs_local_setup_socket(transport); |
1992 | if (ret && !RPC_IS_SOFTCONN(task)) |
1993 | msleep_interruptible(15000); |
1994 | } |
1995 | |
1996 | #ifdef CONFIG_SUNRPC_SWAP |
1997 | static void xs_set_memalloc(struct rpc_xprt *xprt) |
1998 | { |
1999 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, |
2000 | xprt); |
2001 | |
2002 | if (xprt->swapper) |
2003 | sk_set_memalloc(transport->inet); |
2004 | } |
2005 | |
2006 | /** |
2007 | * xs_swapper - Tag this transport as being used for swap. |
2008 | * @xprt: transport to tag |
2009 | * @enable: enable/disable |
2010 | * |
2011 | */ |
2012 | int xs_swapper(struct rpc_xprt *xprt, int enable) |
2013 | { |
2014 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, |
2015 | xprt); |
2016 | int err = 0; |
2017 | |
2018 | if (enable) { |
2019 | xprt->swapper++; |
2020 | xs_set_memalloc(xprt); |
2021 | } else if (xprt->swapper) { |
2022 | xprt->swapper--; |
2023 | sk_clear_memalloc(transport->inet); |
2024 | } |
2025 | |
2026 | return err; |
2027 | } |
2028 | EXPORT_SYMBOL_GPL(xs_swapper); |
2029 | #else |
2030 | static void xs_set_memalloc(struct rpc_xprt *xprt) |
2031 | { |
2032 | } |
2033 | #endif |
2034 | |
2035 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
2036 | { |
2037 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2038 | |
2039 | if (!transport->inet) { |
2040 | struct sock *sk = sock->sk; |
2041 | |
2042 | write_lock_bh(&sk->sk_callback_lock); |
2043 | |
2044 | xs_save_old_callbacks(transport, sk); |
2045 | |
2046 | sk->sk_user_data = xprt; |
2047 | sk->sk_data_ready = xs_udp_data_ready; |
2048 | sk->sk_write_space = xs_udp_write_space; |
2049 | sk->sk_no_check = UDP_CSUM_NORCV; |
2050 | sk->sk_allocation = GFP_ATOMIC; |
2051 | |
2052 | xprt_set_connected(xprt); |
2053 | |
2054 | /* Reset to new socket */ |
2055 | transport->sock = sock; |
2056 | transport->inet = sk; |
2057 | |
2058 | xs_set_memalloc(xprt); |
2059 | |
2060 | write_unlock_bh(&sk->sk_callback_lock); |
2061 | } |
2062 | xs_udp_do_set_buffer_size(xprt); |
2063 | } |
2064 | |
2065 | static void xs_udp_setup_socket(struct work_struct *work) |
2066 | { |
2067 | struct sock_xprt *transport = |
2068 | container_of(work, struct sock_xprt, connect_worker.work); |
2069 | struct rpc_xprt *xprt = &transport->xprt; |
2070 | struct socket *sock = transport->sock; |
2071 | int status = -EIO; |
2072 | |
2073 | current->flags |= PF_FSTRANS; |
2074 | |
2075 | /* Start by resetting any existing state */ |
2076 | xs_reset_transport(transport); |
2077 | sock = xs_create_sock(xprt, transport, |
2078 | xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); |
2079 | if (IS_ERR(sock)) |
2080 | goto out; |
2081 | |
2082 | dprintk("RPC: worker connecting xprt %p via %s to " |
2083 | "%s (port %s)\n", xprt, |
2084 | xprt->address_strings[RPC_DISPLAY_PROTO], |
2085 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2086 | xprt->address_strings[RPC_DISPLAY_PORT]); |
2087 | |
2088 | xs_udp_finish_connecting(xprt, sock); |
2089 | trace_rpc_socket_connect(xprt, sock, 0); |
2090 | status = 0; |
2091 | out: |
2092 | xprt_clear_connecting(xprt); |
2093 | xprt_wake_pending_tasks(xprt, status); |
2094 | current->flags &= ~PF_FSTRANS; |
2095 | } |
2096 | |
2097 | /* |
2098 | * We need to preserve the port number so the reply cache on the server can |
2099 | * find our cached RPC replies when we get around to reconnecting. |
2100 | */ |
2101 | static void xs_abort_connection(struct sock_xprt *transport) |
2102 | { |
2103 | int result; |
2104 | struct sockaddr any; |
2105 | |
2106 | dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); |
2107 | |
2108 | /* |
2109 | * Disconnect the transport socket by doing a connect operation |
2110 | * with AF_UNSPEC. This should return immediately... |
2111 | */ |
2112 | memset(&any, 0, sizeof(any)); |
2113 | any.sa_family = AF_UNSPEC; |
2114 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
2115 | trace_rpc_socket_reset_connection(&transport->xprt, |
2116 | transport->sock, result); |
2117 | if (!result) |
2118 | xs_sock_reset_connection_flags(&transport->xprt); |
2119 | dprintk("RPC: AF_UNSPEC connect return code %d\n", result); |
2120 | } |
2121 | |
2122 | static void xs_tcp_reuse_connection(struct sock_xprt *transport) |
2123 | { |
2124 | unsigned int state = transport->inet->sk_state; |
2125 | |
2126 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { |
2127 | /* we don't need to abort the connection if the socket |
2128 | * hasn't undergone a shutdown |
2129 | */ |
2130 | if (transport->inet->sk_shutdown == 0) |
2131 | return; |
2132 | dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", |
2133 | __func__, transport->inet->sk_shutdown); |
2134 | } |
2135 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { |
2136 | /* we don't need to abort the connection if the socket |
2137 | * hasn't undergone a shutdown |
2138 | */ |
2139 | if (transport->inet->sk_shutdown == 0) |
2140 | return; |
2141 | dprintk("RPC: %s: ESTABLISHED/SYN_SENT " |
2142 | "sk_shutdown set to %d\n", |
2143 | __func__, transport->inet->sk_shutdown); |
2144 | } |
2145 | xs_abort_connection(transport); |
2146 | } |
2147 | |
2148 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
2149 | { |
2150 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2151 | int ret = -ENOTCONN; |
2152 | |
2153 | if (!transport->inet) { |
2154 | struct sock *sk = sock->sk; |
2155 | unsigned int keepidle = xprt->timeout->to_initval / HZ; |
2156 | unsigned int keepcnt = xprt->timeout->to_retries + 1; |
2157 | unsigned int opt_on = 1; |
2158 | |
2159 | /* TCP Keepalive options */ |
2160 | kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
2161 | (char *)&opt_on, sizeof(opt_on)); |
2162 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, |
2163 | (char *)&keepidle, sizeof(keepidle)); |
2164 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, |
2165 | (char *)&keepidle, sizeof(keepidle)); |
2166 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, |
2167 | (char *)&keepcnt, sizeof(keepcnt)); |
2168 | |
2169 | write_lock_bh(&sk->sk_callback_lock); |
2170 | |
2171 | xs_save_old_callbacks(transport, sk); |
2172 | |
2173 | sk->sk_user_data = xprt; |
2174 | sk->sk_data_ready = xs_tcp_data_ready; |
2175 | sk->sk_state_change = xs_tcp_state_change; |
2176 | sk->sk_write_space = xs_tcp_write_space; |
2177 | sk->sk_error_report = xs_error_report; |
2178 | sk->sk_allocation = GFP_ATOMIC; |
2179 | |
2180 | /* socket options */ |
2181 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
2182 | sock_reset_flag(sk, SOCK_LINGER); |
2183 | tcp_sk(sk)->linger2 = 0; |
2184 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
2185 | |
2186 | xprt_clear_connected(xprt); |
2187 | |
2188 | /* Reset to new socket */ |
2189 | transport->sock = sock; |
2190 | transport->inet = sk; |
2191 | |
2192 | write_unlock_bh(&sk->sk_callback_lock); |
2193 | } |
2194 | |
2195 | if (!xprt_bound(xprt)) |
2196 | goto out; |
2197 | |
2198 | xs_set_memalloc(xprt); |
2199 | |
2200 | /* Tell the socket layer to start connecting... */ |
2201 | xprt->stat.connect_count++; |
2202 | xprt->stat.connect_start = jiffies; |
2203 | ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
2204 | switch (ret) { |
2205 | case 0: |
2206 | case -EINPROGRESS: |
2207 | /* SYN_SENT! */ |
2208 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2209 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2210 | } |
2211 | out: |
2212 | return ret; |
2213 | } |
2214 | |
2215 | /** |
2216 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
2217 | * @xprt: RPC transport to connect |
2218 | * @transport: socket transport to connect |
2219 | * @create_sock: function to create a socket of the correct type |
2220 | * |
2221 | * Invoked by a work queue tasklet. |
2222 | */ |
2223 | static void xs_tcp_setup_socket(struct work_struct *work) |
2224 | { |
2225 | struct sock_xprt *transport = |
2226 | container_of(work, struct sock_xprt, connect_worker.work); |
2227 | struct socket *sock = transport->sock; |
2228 | struct rpc_xprt *xprt = &transport->xprt; |
2229 | int status = -EIO; |
2230 | |
2231 | current->flags |= PF_FSTRANS; |
2232 | |
2233 | if (!sock) { |
2234 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
2235 | sock = xs_create_sock(xprt, transport, |
2236 | xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); |
2237 | if (IS_ERR(sock)) { |
2238 | status = PTR_ERR(sock); |
2239 | goto out; |
2240 | } |
2241 | } else { |
2242 | int abort_and_exit; |
2243 | |
2244 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
2245 | &xprt->state); |
2246 | /* "close" the socket, preserving the local port */ |
2247 | xs_tcp_reuse_connection(transport); |
2248 | |
2249 | if (abort_and_exit) |
2250 | goto out_eagain; |
2251 | } |
2252 | |
2253 | dprintk("RPC: worker connecting xprt %p via %s to " |
2254 | "%s (port %s)\n", xprt, |
2255 | xprt->address_strings[RPC_DISPLAY_PROTO], |
2256 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2257 | xprt->address_strings[RPC_DISPLAY_PORT]); |
2258 | |
2259 | status = xs_tcp_finish_connecting(xprt, sock); |
2260 | trace_rpc_socket_connect(xprt, sock, status); |
2261 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
2262 | xprt, -status, xprt_connected(xprt), |
2263 | sock->sk->sk_state); |
2264 | switch (status) { |
2265 | default: |
2266 | printk("%s: connect returned unhandled error %d\n", |
2267 | __func__, status); |
2268 | case -EADDRNOTAVAIL: |
2269 | /* We're probably in TIME_WAIT. Get rid of existing socket, |
2270 | * and retry |
2271 | */ |
2272 | xs_tcp_force_close(xprt); |
2273 | break; |
2274 | case 0: |
2275 | case -EINPROGRESS: |
2276 | case -EALREADY: |
2277 | xprt_clear_connecting(xprt); |
2278 | current->flags &= ~PF_FSTRANS; |
2279 | return; |
2280 | case -EINVAL: |
2281 | /* Happens, for instance, if the user specified a link |
2282 | * local IPv6 address without a scope-id. |
2283 | */ |
2284 | case -ECONNREFUSED: |
2285 | case -ECONNRESET: |
2286 | case -ENETUNREACH: |
2287 | /* retry with existing socket, after a delay */ |
2288 | goto out; |
2289 | } |
2290 | out_eagain: |
2291 | status = -EAGAIN; |
2292 | out: |
2293 | xprt_clear_connecting(xprt); |
2294 | xprt_wake_pending_tasks(xprt, status); |
2295 | current->flags &= ~PF_FSTRANS; |
2296 | } |
2297 | |
2298 | /** |
2299 | * xs_connect - connect a socket to a remote endpoint |
2300 | * @xprt: pointer to transport structure |
2301 | * @task: address of RPC task that manages state of connect request |
2302 | * |
2303 | * TCP: If the remote end dropped the connection, delay reconnecting. |
2304 | * |
2305 | * UDP socket connects are synchronous, but we use a work queue anyway |
2306 | * to guarantee that even unprivileged user processes can set up a |
2307 | * socket on a privileged port. |
2308 | * |
2309 | * If a UDP socket connect fails, the delay behavior here prevents |
2310 | * retry floods (hard mounts). |
2311 | */ |
2312 | static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
2313 | { |
2314 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2315 | |
2316 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
2317 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2318 | "seconds\n", |
2319 | xprt, xprt->reestablish_timeout / HZ); |
2320 | queue_delayed_work(rpciod_workqueue, |
2321 | &transport->connect_worker, |
2322 | xprt->reestablish_timeout); |
2323 | xprt->reestablish_timeout <<= 1; |
2324 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2325 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2326 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2327 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; |
2328 | } else { |
2329 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
2330 | queue_delayed_work(rpciod_workqueue, |
2331 | &transport->connect_worker, 0); |
2332 | } |
2333 | } |
2334 | |
2335 | /** |
2336 | * xs_local_print_stats - display AF_LOCAL socket-specifc stats |
2337 | * @xprt: rpc_xprt struct containing statistics |
2338 | * @seq: output file |
2339 | * |
2340 | */ |
2341 | static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
2342 | { |
2343 | long idle_time = 0; |
2344 | |
2345 | if (xprt_connected(xprt)) |
2346 | idle_time = (long)(jiffies - xprt->last_used) / HZ; |
2347 | |
2348 | seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " |
2349 | "%llu %llu %lu %llu %llu\n", |
2350 | xprt->stat.bind_count, |
2351 | xprt->stat.connect_count, |
2352 | xprt->stat.connect_time, |
2353 | idle_time, |
2354 | xprt->stat.sends, |
2355 | xprt->stat.recvs, |
2356 | xprt->stat.bad_xids, |
2357 | xprt->stat.req_u, |
2358 | xprt->stat.bklog_u, |
2359 | xprt->stat.max_slots, |
2360 | xprt->stat.sending_u, |
2361 | xprt->stat.pending_u); |
2362 | } |
2363 | |
2364 | /** |
2365 | * xs_udp_print_stats - display UDP socket-specifc stats |
2366 | * @xprt: rpc_xprt struct containing statistics |
2367 | * @seq: output file |
2368 | * |
2369 | */ |
2370 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
2371 | { |
2372 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2373 | |
2374 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " |
2375 | "%lu %llu %llu\n", |
2376 | transport->srcport, |
2377 | xprt->stat.bind_count, |
2378 | xprt->stat.sends, |
2379 | xprt->stat.recvs, |
2380 | xprt->stat.bad_xids, |
2381 | xprt->stat.req_u, |
2382 | xprt->stat.bklog_u, |
2383 | xprt->stat.max_slots, |
2384 | xprt->stat.sending_u, |
2385 | xprt->stat.pending_u); |
2386 | } |
2387 | |
2388 | /** |
2389 | * xs_tcp_print_stats - display TCP socket-specifc stats |
2390 | * @xprt: rpc_xprt struct containing statistics |
2391 | * @seq: output file |
2392 | * |
2393 | */ |
2394 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
2395 | { |
2396 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2397 | long idle_time = 0; |
2398 | |
2399 | if (xprt_connected(xprt)) |
2400 | idle_time = (long)(jiffies - xprt->last_used) / HZ; |
2401 | |
2402 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " |
2403 | "%llu %llu %lu %llu %llu\n", |
2404 | transport->srcport, |
2405 | xprt->stat.bind_count, |
2406 | xprt->stat.connect_count, |
2407 | xprt->stat.connect_time, |
2408 | idle_time, |
2409 | xprt->stat.sends, |
2410 | xprt->stat.recvs, |
2411 | xprt->stat.bad_xids, |
2412 | xprt->stat.req_u, |
2413 | xprt->stat.bklog_u, |
2414 | xprt->stat.max_slots, |
2415 | xprt->stat.sending_u, |
2416 | xprt->stat.pending_u); |
2417 | } |
2418 | |
2419 | /* |
2420 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason |
2421 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want |
2422 | * to use the server side send routines. |
2423 | */ |
2424 | static void *bc_malloc(struct rpc_task *task, size_t size) |
2425 | { |
2426 | struct page *page; |
2427 | struct rpc_buffer *buf; |
2428 | |
2429 | WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); |
2430 | if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) |
2431 | return NULL; |
2432 | |
2433 | page = alloc_page(GFP_KERNEL); |
2434 | if (!page) |
2435 | return NULL; |
2436 | |
2437 | buf = page_address(page); |
2438 | buf->len = PAGE_SIZE; |
2439 | |
2440 | return buf->data; |
2441 | } |
2442 | |
2443 | /* |
2444 | * Free the space allocated in the bc_alloc routine |
2445 | */ |
2446 | static void bc_free(void *buffer) |
2447 | { |
2448 | struct rpc_buffer *buf; |
2449 | |
2450 | if (!buffer) |
2451 | return; |
2452 | |
2453 | buf = container_of(buffer, struct rpc_buffer, data); |
2454 | free_page((unsigned long)buf); |
2455 | } |
2456 | |
2457 | /* |
2458 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex |
2459 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. |
2460 | */ |
2461 | static int bc_sendto(struct rpc_rqst *req) |
2462 | { |
2463 | int len; |
2464 | struct xdr_buf *xbufp = &req->rq_snd_buf; |
2465 | struct rpc_xprt *xprt = req->rq_xprt; |
2466 | struct sock_xprt *transport = |
2467 | container_of(xprt, struct sock_xprt, xprt); |
2468 | struct socket *sock = transport->sock; |
2469 | unsigned long headoff; |
2470 | unsigned long tailoff; |
2471 | |
2472 | xs_encode_stream_record_marker(xbufp); |
2473 | |
2474 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; |
2475 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; |
2476 | len = svc_send_common(sock, xbufp, |
2477 | virt_to_page(xbufp->head[0].iov_base), headoff, |
2478 | xbufp->tail[0].iov_base, tailoff); |
2479 | |
2480 | if (len != xbufp->len) { |
2481 | printk(KERN_NOTICE "Error sending entire callback!\n"); |
2482 | len = -EAGAIN; |
2483 | } |
2484 | |
2485 | return len; |
2486 | } |
2487 | |
2488 | /* |
2489 | * The send routine. Borrows from svc_send |
2490 | */ |
2491 | static int bc_send_request(struct rpc_task *task) |
2492 | { |
2493 | struct rpc_rqst *req = task->tk_rqstp; |
2494 | struct svc_xprt *xprt; |
2495 | u32 len; |
2496 | |
2497 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); |
2498 | /* |
2499 | * Get the server socket associated with this callback xprt |
2500 | */ |
2501 | xprt = req->rq_xprt->bc_xprt; |
2502 | |
2503 | /* |
2504 | * Grab the mutex to serialize data as the connection is shared |
2505 | * with the fore channel |
2506 | */ |
2507 | if (!mutex_trylock(&xprt->xpt_mutex)) { |
2508 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); |
2509 | if (!mutex_trylock(&xprt->xpt_mutex)) |
2510 | return -EAGAIN; |
2511 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); |
2512 | } |
2513 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) |
2514 | len = -ENOTCONN; |
2515 | else |
2516 | len = bc_sendto(req); |
2517 | mutex_unlock(&xprt->xpt_mutex); |
2518 | |
2519 | if (len > 0) |
2520 | len = 0; |
2521 | |
2522 | return len; |
2523 | } |
2524 | |
2525 | /* |
2526 | * The close routine. Since this is client initiated, we do nothing |
2527 | */ |
2528 | |
2529 | static void bc_close(struct rpc_xprt *xprt) |
2530 | { |
2531 | } |
2532 | |
2533 | /* |
2534 | * The xprt destroy routine. Again, because this connection is client |
2535 | * initiated, we do nothing |
2536 | */ |
2537 | |
2538 | static void bc_destroy(struct rpc_xprt *xprt) |
2539 | { |
2540 | dprintk("RPC: bc_destroy xprt %p\n", xprt); |
2541 | |
2542 | xs_xprt_free(xprt); |
2543 | module_put(THIS_MODULE); |
2544 | } |
2545 | |
2546 | static struct rpc_xprt_ops xs_local_ops = { |
2547 | .reserve_xprt = xprt_reserve_xprt, |
2548 | .release_xprt = xs_tcp_release_xprt, |
2549 | .alloc_slot = xprt_alloc_slot, |
2550 | .rpcbind = xs_local_rpcbind, |
2551 | .set_port = xs_local_set_port, |
2552 | .connect = xs_local_connect, |
2553 | .buf_alloc = rpc_malloc, |
2554 | .buf_free = rpc_free, |
2555 | .send_request = xs_local_send_request, |
2556 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
2557 | .close = xs_close, |
2558 | .destroy = xs_destroy, |
2559 | .print_stats = xs_local_print_stats, |
2560 | }; |
2561 | |
2562 | static struct rpc_xprt_ops xs_udp_ops = { |
2563 | .set_buffer_size = xs_udp_set_buffer_size, |
2564 | .reserve_xprt = xprt_reserve_xprt_cong, |
2565 | .release_xprt = xprt_release_xprt_cong, |
2566 | .alloc_slot = xprt_alloc_slot, |
2567 | .rpcbind = rpcb_getport_async, |
2568 | .set_port = xs_set_port, |
2569 | .connect = xs_connect, |
2570 | .buf_alloc = rpc_malloc, |
2571 | .buf_free = rpc_free, |
2572 | .send_request = xs_udp_send_request, |
2573 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
2574 | .timer = xs_udp_timer, |
2575 | .release_request = xprt_release_rqst_cong, |
2576 | .close = xs_close, |
2577 | .destroy = xs_destroy, |
2578 | .print_stats = xs_udp_print_stats, |
2579 | }; |
2580 | |
2581 | static struct rpc_xprt_ops xs_tcp_ops = { |
2582 | .reserve_xprt = xprt_reserve_xprt, |
2583 | .release_xprt = xs_tcp_release_xprt, |
2584 | .alloc_slot = xprt_lock_and_alloc_slot, |
2585 | .rpcbind = rpcb_getport_async, |
2586 | .set_port = xs_set_port, |
2587 | .connect = xs_connect, |
2588 | .buf_alloc = rpc_malloc, |
2589 | .buf_free = rpc_free, |
2590 | .send_request = xs_tcp_send_request, |
2591 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
2592 | .close = xs_tcp_close, |
2593 | .destroy = xs_destroy, |
2594 | .print_stats = xs_tcp_print_stats, |
2595 | }; |
2596 | |
2597 | /* |
2598 | * The rpc_xprt_ops for the server backchannel |
2599 | */ |
2600 | |
2601 | static struct rpc_xprt_ops bc_tcp_ops = { |
2602 | .reserve_xprt = xprt_reserve_xprt, |
2603 | .release_xprt = xprt_release_xprt, |
2604 | .alloc_slot = xprt_alloc_slot, |
2605 | .buf_alloc = bc_malloc, |
2606 | .buf_free = bc_free, |
2607 | .send_request = bc_send_request, |
2608 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
2609 | .close = bc_close, |
2610 | .destroy = bc_destroy, |
2611 | .print_stats = xs_tcp_print_stats, |
2612 | }; |
2613 | |
2614 | static int xs_init_anyaddr(const int family, struct sockaddr *sap) |
2615 | { |
2616 | static const struct sockaddr_in sin = { |
2617 | .sin_family = AF_INET, |
2618 | .sin_addr.s_addr = htonl(INADDR_ANY), |
2619 | }; |
2620 | static const struct sockaddr_in6 sin6 = { |
2621 | .sin6_family = AF_INET6, |
2622 | .sin6_addr = IN6ADDR_ANY_INIT, |
2623 | }; |
2624 | |
2625 | switch (family) { |
2626 | case AF_LOCAL: |
2627 | break; |
2628 | case AF_INET: |
2629 | memcpy(sap, &sin, sizeof(sin)); |
2630 | break; |
2631 | case AF_INET6: |
2632 | memcpy(sap, &sin6, sizeof(sin6)); |
2633 | break; |
2634 | default: |
2635 | dprintk("RPC: %s: Bad address family\n", __func__); |
2636 | return -EAFNOSUPPORT; |
2637 | } |
2638 | return 0; |
2639 | } |
2640 | |
2641 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
2642 | unsigned int slot_table_size, |
2643 | unsigned int max_slot_table_size) |
2644 | { |
2645 | struct rpc_xprt *xprt; |
2646 | struct sock_xprt *new; |
2647 | |
2648 | if (args->addrlen > sizeof(xprt->addr)) { |
2649 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
2650 | return ERR_PTR(-EBADF); |
2651 | } |
2652 | |
2653 | xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, |
2654 | max_slot_table_size); |
2655 | if (xprt == NULL) { |
2656 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2657 | "rpc_xprt\n"); |
2658 | return ERR_PTR(-ENOMEM); |
2659 | } |
2660 | |
2661 | new = container_of(xprt, struct sock_xprt, xprt); |
2662 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2663 | xprt->addrlen = args->addrlen; |
2664 | if (args->srcaddr) |
2665 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
2666 | else { |
2667 | int err; |
2668 | err = xs_init_anyaddr(args->dstaddr->sa_family, |
2669 | (struct sockaddr *)&new->srcaddr); |
2670 | if (err != 0) { |
2671 | xprt_free(xprt); |
2672 | return ERR_PTR(err); |
2673 | } |
2674 | } |
2675 | |
2676 | return xprt; |
2677 | } |
2678 | |
2679 | static const struct rpc_timeout xs_local_default_timeout = { |
2680 | .to_initval = 10 * HZ, |
2681 | .to_maxval = 10 * HZ, |
2682 | .to_retries = 2, |
2683 | }; |
2684 | |
2685 | /** |
2686 | * xs_setup_local - Set up transport to use an AF_LOCAL socket |
2687 | * @args: rpc transport creation arguments |
2688 | * |
2689 | * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP |
2690 | */ |
2691 | static struct rpc_xprt *xs_setup_local(struct xprt_create *args) |
2692 | { |
2693 | struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; |
2694 | struct sock_xprt *transport; |
2695 | struct rpc_xprt *xprt; |
2696 | struct rpc_xprt *ret; |
2697 | |
2698 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2699 | xprt_max_tcp_slot_table_entries); |
2700 | if (IS_ERR(xprt)) |
2701 | return xprt; |
2702 | transport = container_of(xprt, struct sock_xprt, xprt); |
2703 | |
2704 | xprt->prot = 0; |
2705 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
2706 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
2707 | |
2708 | xprt->bind_timeout = XS_BIND_TO; |
2709 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2710 | xprt->idle_timeout = XS_IDLE_DISC_TO; |
2711 | |
2712 | xprt->ops = &xs_local_ops; |
2713 | xprt->timeout = &xs_local_default_timeout; |
2714 | |
2715 | INIT_DELAYED_WORK(&transport->connect_worker, |
2716 | xs_dummy_setup_socket); |
2717 | |
2718 | switch (sun->sun_family) { |
2719 | case AF_LOCAL: |
2720 | if (sun->sun_path[0] != '/') { |
2721 | dprintk("RPC: bad AF_LOCAL address: %s\n", |
2722 | sun->sun_path); |
2723 | ret = ERR_PTR(-EINVAL); |
2724 | goto out_err; |
2725 | } |
2726 | xprt_set_bound(xprt); |
2727 | xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); |
2728 | ret = ERR_PTR(xs_local_setup_socket(transport)); |
2729 | if (ret) |
2730 | goto out_err; |
2731 | break; |
2732 | default: |
2733 | ret = ERR_PTR(-EAFNOSUPPORT); |
2734 | goto out_err; |
2735 | } |
2736 | |
2737 | dprintk("RPC: set up xprt to %s via AF_LOCAL\n", |
2738 | xprt->address_strings[RPC_DISPLAY_ADDR]); |
2739 | |
2740 | if (try_module_get(THIS_MODULE)) |
2741 | return xprt; |
2742 | ret = ERR_PTR(-EINVAL); |
2743 | out_err: |
2744 | xs_xprt_free(xprt); |
2745 | return ret; |
2746 | } |
2747 | |
2748 | static const struct rpc_timeout xs_udp_default_timeout = { |
2749 | .to_initval = 5 * HZ, |
2750 | .to_maxval = 30 * HZ, |
2751 | .to_increment = 5 * HZ, |
2752 | .to_retries = 5, |
2753 | }; |
2754 | |
2755 | /** |
2756 | * xs_setup_udp - Set up transport to use a UDP socket |
2757 | * @args: rpc transport creation arguments |
2758 | * |
2759 | */ |
2760 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
2761 | { |
2762 | struct sockaddr *addr = args->dstaddr; |
2763 | struct rpc_xprt *xprt; |
2764 | struct sock_xprt *transport; |
2765 | struct rpc_xprt *ret; |
2766 | |
2767 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, |
2768 | xprt_udp_slot_table_entries); |
2769 | if (IS_ERR(xprt)) |
2770 | return xprt; |
2771 | transport = container_of(xprt, struct sock_xprt, xprt); |
2772 | |
2773 | xprt->prot = IPPROTO_UDP; |
2774 | xprt->tsh_size = 0; |
2775 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2776 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); |
2777 | |
2778 | xprt->bind_timeout = XS_BIND_TO; |
2779 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2780 | xprt->idle_timeout = XS_IDLE_DISC_TO; |
2781 | |
2782 | xprt->ops = &xs_udp_ops; |
2783 | |
2784 | xprt->timeout = &xs_udp_default_timeout; |
2785 | |
2786 | switch (addr->sa_family) { |
2787 | case AF_INET: |
2788 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) |
2789 | xprt_set_bound(xprt); |
2790 | |
2791 | INIT_DELAYED_WORK(&transport->connect_worker, |
2792 | xs_udp_setup_socket); |
2793 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
2794 | break; |
2795 | case AF_INET6: |
2796 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) |
2797 | xprt_set_bound(xprt); |
2798 | |
2799 | INIT_DELAYED_WORK(&transport->connect_worker, |
2800 | xs_udp_setup_socket); |
2801 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
2802 | break; |
2803 | default: |
2804 | ret = ERR_PTR(-EAFNOSUPPORT); |
2805 | goto out_err; |
2806 | } |
2807 | |
2808 | if (xprt_bound(xprt)) |
2809 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2810 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2811 | xprt->address_strings[RPC_DISPLAY_PORT], |
2812 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2813 | else |
2814 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", |
2815 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2816 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2817 | |
2818 | if (try_module_get(THIS_MODULE)) |
2819 | return xprt; |
2820 | ret = ERR_PTR(-EINVAL); |
2821 | out_err: |
2822 | xs_xprt_free(xprt); |
2823 | return ret; |
2824 | } |
2825 | |
2826 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2827 | .to_initval = 60 * HZ, |
2828 | .to_maxval = 60 * HZ, |
2829 | .to_retries = 2, |
2830 | }; |
2831 | |
2832 | /** |
2833 | * xs_setup_tcp - Set up transport to use a TCP socket |
2834 | * @args: rpc transport creation arguments |
2835 | * |
2836 | */ |
2837 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
2838 | { |
2839 | struct sockaddr *addr = args->dstaddr; |
2840 | struct rpc_xprt *xprt; |
2841 | struct sock_xprt *transport; |
2842 | struct rpc_xprt *ret; |
2843 | unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; |
2844 | |
2845 | if (args->flags & XPRT_CREATE_INFINITE_SLOTS) |
2846 | max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; |
2847 | |
2848 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2849 | max_slot_table_size); |
2850 | if (IS_ERR(xprt)) |
2851 | return xprt; |
2852 | transport = container_of(xprt, struct sock_xprt, xprt); |
2853 | |
2854 | xprt->prot = IPPROTO_TCP; |
2855 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
2856 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
2857 | |
2858 | xprt->bind_timeout = XS_BIND_TO; |
2859 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2860 | xprt->idle_timeout = XS_IDLE_DISC_TO; |
2861 | |
2862 | xprt->ops = &xs_tcp_ops; |
2863 | xprt->timeout = &xs_tcp_default_timeout; |
2864 | |
2865 | switch (addr->sa_family) { |
2866 | case AF_INET: |
2867 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) |
2868 | xprt_set_bound(xprt); |
2869 | |
2870 | INIT_DELAYED_WORK(&transport->connect_worker, |
2871 | xs_tcp_setup_socket); |
2872 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
2873 | break; |
2874 | case AF_INET6: |
2875 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) |
2876 | xprt_set_bound(xprt); |
2877 | |
2878 | INIT_DELAYED_WORK(&transport->connect_worker, |
2879 | xs_tcp_setup_socket); |
2880 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
2881 | break; |
2882 | default: |
2883 | ret = ERR_PTR(-EAFNOSUPPORT); |
2884 | goto out_err; |
2885 | } |
2886 | |
2887 | if (xprt_bound(xprt)) |
2888 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2889 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2890 | xprt->address_strings[RPC_DISPLAY_PORT], |
2891 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2892 | else |
2893 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", |
2894 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2895 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2896 | |
2897 | if (try_module_get(THIS_MODULE)) |
2898 | return xprt; |
2899 | ret = ERR_PTR(-EINVAL); |
2900 | out_err: |
2901 | xs_xprt_free(xprt); |
2902 | return ret; |
2903 | } |
2904 | |
2905 | /** |
2906 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket |
2907 | * @args: rpc transport creation arguments |
2908 | * |
2909 | */ |
2910 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) |
2911 | { |
2912 | struct sockaddr *addr = args->dstaddr; |
2913 | struct rpc_xprt *xprt; |
2914 | struct sock_xprt *transport; |
2915 | struct svc_sock *bc_sock; |
2916 | struct rpc_xprt *ret; |
2917 | |
2918 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2919 | xprt_tcp_slot_table_entries); |
2920 | if (IS_ERR(xprt)) |
2921 | return xprt; |
2922 | transport = container_of(xprt, struct sock_xprt, xprt); |
2923 | |
2924 | xprt->prot = IPPROTO_TCP; |
2925 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
2926 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
2927 | xprt->timeout = &xs_tcp_default_timeout; |
2928 | |
2929 | /* backchannel */ |
2930 | xprt_set_bound(xprt); |
2931 | xprt->bind_timeout = 0; |
2932 | xprt->reestablish_timeout = 0; |
2933 | xprt->idle_timeout = 0; |
2934 | |
2935 | xprt->ops = &bc_tcp_ops; |
2936 | |
2937 | switch (addr->sa_family) { |
2938 | case AF_INET: |
2939 | xs_format_peer_addresses(xprt, "tcp", |
2940 | RPCBIND_NETID_TCP); |
2941 | break; |
2942 | case AF_INET6: |
2943 | xs_format_peer_addresses(xprt, "tcp", |
2944 | RPCBIND_NETID_TCP6); |
2945 | break; |
2946 | default: |
2947 | ret = ERR_PTR(-EAFNOSUPPORT); |
2948 | goto out_err; |
2949 | } |
2950 | |
2951 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2952 | xprt->address_strings[RPC_DISPLAY_ADDR], |
2953 | xprt->address_strings[RPC_DISPLAY_PORT], |
2954 | xprt->address_strings[RPC_DISPLAY_PROTO]); |
2955 | |
2956 | /* |
2957 | * Once we've associated a backchannel xprt with a connection, |
2958 | * we want to keep it around as long as the connection lasts, |
2959 | * in case we need to start using it for a backchannel again; |
2960 | * this reference won't be dropped until bc_xprt is destroyed. |
2961 | */ |
2962 | xprt_get(xprt); |
2963 | args->bc_xprt->xpt_bc_xprt = xprt; |
2964 | xprt->bc_xprt = args->bc_xprt; |
2965 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); |
2966 | transport->sock = bc_sock->sk_sock; |
2967 | transport->inet = bc_sock->sk_sk; |
2968 | |
2969 | /* |
2970 | * Since we don't want connections for the backchannel, we set |
2971 | * the xprt status to connected |
2972 | */ |
2973 | xprt_set_connected(xprt); |
2974 | |
2975 | if (try_module_get(THIS_MODULE)) |
2976 | return xprt; |
2977 | |
2978 | args->bc_xprt->xpt_bc_xprt = NULL; |
2979 | xprt_put(xprt); |
2980 | ret = ERR_PTR(-EINVAL); |
2981 | out_err: |
2982 | xs_xprt_free(xprt); |
2983 | return ret; |
2984 | } |
2985 | |
2986 | static struct xprt_class xs_local_transport = { |
2987 | .list = LIST_HEAD_INIT(xs_local_transport.list), |
2988 | .name = "named UNIX socket", |
2989 | .owner = THIS_MODULE, |
2990 | .ident = XPRT_TRANSPORT_LOCAL, |
2991 | .setup = xs_setup_local, |
2992 | }; |
2993 | |
2994 | static struct xprt_class xs_udp_transport = { |
2995 | .list = LIST_HEAD_INIT(xs_udp_transport.list), |
2996 | .name = "udp", |
2997 | .owner = THIS_MODULE, |
2998 | .ident = XPRT_TRANSPORT_UDP, |
2999 | .setup = xs_setup_udp, |
3000 | }; |
3001 | |
3002 | static struct xprt_class xs_tcp_transport = { |
3003 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), |
3004 | .name = "tcp", |
3005 | .owner = THIS_MODULE, |
3006 | .ident = XPRT_TRANSPORT_TCP, |
3007 | .setup = xs_setup_tcp, |
3008 | }; |
3009 | |
3010 | static struct xprt_class xs_bc_tcp_transport = { |
3011 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), |
3012 | .name = "tcp NFSv4.1 backchannel", |
3013 | .owner = THIS_MODULE, |
3014 | .ident = XPRT_TRANSPORT_BC_TCP, |
3015 | .setup = xs_setup_bc_tcp, |
3016 | }; |
3017 | |
3018 | /** |
3019 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
3020 | * |
3021 | */ |
3022 | int init_socket_xprt(void) |
3023 | { |
3024 | #ifdef RPC_DEBUG |
3025 | if (!sunrpc_table_header) |
3026 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
3027 | #endif |
3028 | |
3029 | xprt_register_transport(&xs_local_transport); |
3030 | xprt_register_transport(&xs_udp_transport); |
3031 | xprt_register_transport(&xs_tcp_transport); |
3032 | xprt_register_transport(&xs_bc_tcp_transport); |
3033 | |
3034 | return 0; |
3035 | } |
3036 | |
3037 | /** |
3038 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
3039 | * |
3040 | */ |
3041 | void cleanup_socket_xprt(void) |
3042 | { |
3043 | #ifdef RPC_DEBUG |
3044 | if (sunrpc_table_header) { |
3045 | unregister_sysctl_table(sunrpc_table_header); |
3046 | sunrpc_table_header = NULL; |
3047 | } |
3048 | #endif |
3049 | |
3050 | xprt_unregister_transport(&xs_local_transport); |
3051 | xprt_unregister_transport(&xs_udp_transport); |
3052 | xprt_unregister_transport(&xs_tcp_transport); |
3053 | xprt_unregister_transport(&xs_bc_tcp_transport); |
3054 | } |
3055 | |
3056 | static int param_set_uint_minmax(const char *val, |
3057 | const struct kernel_param *kp, |
3058 | unsigned int min, unsigned int max) |
3059 | { |
3060 | unsigned long num; |
3061 | int ret; |
3062 | |
3063 | if (!val) |
3064 | return -EINVAL; |
3065 | ret = strict_strtoul(val, 0, &num); |
3066 | if (ret == -EINVAL || num < min || num > max) |
3067 | return -EINVAL; |
3068 | *((unsigned int *)kp->arg) = num; |
3069 | return 0; |
3070 | } |
3071 | |
3072 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
3073 | { |
3074 | return param_set_uint_minmax(val, kp, |
3075 | RPC_MIN_RESVPORT, |
3076 | RPC_MAX_RESVPORT); |
3077 | } |
3078 | |
3079 | static struct kernel_param_ops param_ops_portnr = { |
3080 | .set = param_set_portnr, |
3081 | .get = param_get_uint, |
3082 | }; |
3083 | |
3084 | #define param_check_portnr(name, p) \ |
3085 | __param_check(name, p, unsigned int); |
3086 | |
3087 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); |
3088 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); |
3089 | |
3090 | static int param_set_slot_table_size(const char *val, |
3091 | const struct kernel_param *kp) |
3092 | { |
3093 | return param_set_uint_minmax(val, kp, |
3094 | RPC_MIN_SLOT_TABLE, |
3095 | RPC_MAX_SLOT_TABLE); |
3096 | } |
3097 | |
3098 | static struct kernel_param_ops param_ops_slot_table_size = { |
3099 | .set = param_set_slot_table_size, |
3100 | .get = param_get_uint, |
3101 | }; |
3102 | |
3103 | #define param_check_slot_table_size(name, p) \ |
3104 | __param_check(name, p, unsigned int); |
3105 | |
3106 | static int param_set_max_slot_table_size(const char *val, |
3107 | const struct kernel_param *kp) |
3108 | { |
3109 | return param_set_uint_minmax(val, kp, |
3110 | RPC_MIN_SLOT_TABLE, |
3111 | RPC_MAX_SLOT_TABLE_LIMIT); |
3112 | } |
3113 | |
3114 | static struct kernel_param_ops param_ops_max_slot_table_size = { |
3115 | .set = param_set_max_slot_table_size, |
3116 | .get = param_get_uint, |
3117 | }; |
3118 | |
3119 | #define param_check_max_slot_table_size(name, p) \ |
3120 | __param_check(name, p, unsigned int); |
3121 | |
3122 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
3123 | slot_table_size, 0644); |
3124 | module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, |
3125 | max_slot_table_size, 0644); |
3126 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
3127 | slot_table_size, 0644); |
3128 | |
3129 |
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