Commit | Line | Data |
---|---|---|
a246b010 CL |
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 Software <alan@redhat.com> | |
7 | * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com> | |
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> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/capability.h> | |
a246b010 CL |
24 | #include <linux/pagemap.h> |
25 | #include <linux/errno.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/udp.h> | |
31 | #include <linux/tcp.h> | |
32 | #include <linux/sunrpc/clnt.h> | |
02107148 | 33 | #include <linux/sunrpc/sched.h> |
a246b010 CL |
34 | #include <linux/file.h> |
35 | ||
36 | #include <net/sock.h> | |
37 | #include <net/checksum.h> | |
38 | #include <net/udp.h> | |
39 | #include <net/tcp.h> | |
40 | ||
c556b754 CL |
41 | /* |
42 | * xprtsock tunables | |
43 | */ | |
44 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
45 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
46 | ||
47 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
48 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
49 | ||
fbf76683 CL |
50 | /* |
51 | * We can register our own files under /proc/sys/sunrpc by | |
52 | * calling register_sysctl_table() again. The files in that | |
53 | * directory become the union of all files registered there. | |
54 | * | |
55 | * We simply need to make sure that we don't collide with | |
56 | * someone else's file names! | |
57 | */ | |
58 | ||
59 | #ifdef RPC_DEBUG | |
60 | ||
61 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
62 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
63 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; | |
64 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
65 | ||
66 | static struct ctl_table_header *sunrpc_table_header; | |
67 | ||
68 | /* | |
69 | * FIXME: changing the UDP slot table size should also resize the UDP | |
70 | * socket buffers for existing UDP transports | |
71 | */ | |
72 | static ctl_table xs_tunables_table[] = { | |
73 | { | |
74 | .ctl_name = CTL_SLOTTABLE_UDP, | |
75 | .procname = "udp_slot_table_entries", | |
76 | .data = &xprt_udp_slot_table_entries, | |
77 | .maxlen = sizeof(unsigned int), | |
78 | .mode = 0644, | |
79 | .proc_handler = &proc_dointvec_minmax, | |
80 | .strategy = &sysctl_intvec, | |
81 | .extra1 = &min_slot_table_size, | |
82 | .extra2 = &max_slot_table_size | |
83 | }, | |
84 | { | |
85 | .ctl_name = CTL_SLOTTABLE_TCP, | |
86 | .procname = "tcp_slot_table_entries", | |
87 | .data = &xprt_tcp_slot_table_entries, | |
88 | .maxlen = sizeof(unsigned int), | |
89 | .mode = 0644, | |
90 | .proc_handler = &proc_dointvec_minmax, | |
91 | .strategy = &sysctl_intvec, | |
92 | .extra1 = &min_slot_table_size, | |
93 | .extra2 = &max_slot_table_size | |
94 | }, | |
95 | { | |
96 | .ctl_name = CTL_MIN_RESVPORT, | |
97 | .procname = "min_resvport", | |
98 | .data = &xprt_min_resvport, | |
99 | .maxlen = sizeof(unsigned int), | |
100 | .mode = 0644, | |
101 | .proc_handler = &proc_dointvec_minmax, | |
102 | .strategy = &sysctl_intvec, | |
103 | .extra1 = &xprt_min_resvport_limit, | |
104 | .extra2 = &xprt_max_resvport_limit | |
105 | }, | |
106 | { | |
107 | .ctl_name = CTL_MAX_RESVPORT, | |
108 | .procname = "max_resvport", | |
109 | .data = &xprt_max_resvport, | |
110 | .maxlen = sizeof(unsigned int), | |
111 | .mode = 0644, | |
112 | .proc_handler = &proc_dointvec_minmax, | |
113 | .strategy = &sysctl_intvec, | |
114 | .extra1 = &xprt_min_resvport_limit, | |
115 | .extra2 = &xprt_max_resvport_limit | |
116 | }, | |
117 | { | |
118 | .ctl_name = 0, | |
119 | }, | |
120 | }; | |
121 | ||
122 | static ctl_table sunrpc_table[] = { | |
123 | { | |
124 | .ctl_name = CTL_SUNRPC, | |
125 | .procname = "sunrpc", | |
126 | .mode = 0555, | |
127 | .child = xs_tunables_table | |
128 | }, | |
129 | { | |
130 | .ctl_name = 0, | |
131 | }, | |
132 | }; | |
133 | ||
134 | #endif | |
135 | ||
262965f5 CL |
136 | /* |
137 | * How many times to try sending a request on a socket before waiting | |
138 | * for the socket buffer to clear. | |
139 | */ | |
140 | #define XS_SENDMSG_RETRY (10U) | |
141 | ||
03bf4b70 CL |
142 | /* |
143 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
144 | * synchronous, but we set a timeout anyway in case of resource | |
145 | * exhaustion on the local host. | |
146 | */ | |
147 | #define XS_UDP_CONN_TO (5U * HZ) | |
148 | ||
149 | /* | |
150 | * Wait duration for an RPC TCP connection to be established. Solaris | |
151 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
152 | * long a server takes to reboot. | |
153 | */ | |
154 | #define XS_TCP_CONN_TO (60U * HZ) | |
155 | ||
156 | /* | |
157 | * Wait duration for a reply from the RPC portmapper. | |
158 | */ | |
159 | #define XS_BIND_TO (60U * HZ) | |
160 | ||
161 | /* | |
162 | * Delay if a UDP socket connect error occurs. This is most likely some | |
163 | * kind of resource problem on the local host. | |
164 | */ | |
165 | #define XS_UDP_REEST_TO (2U * HZ) | |
166 | ||
167 | /* | |
168 | * The reestablish timeout allows clients to delay for a bit before attempting | |
169 | * to reconnect to a server that just dropped our connection. | |
170 | * | |
171 | * We implement an exponential backoff when trying to reestablish a TCP | |
172 | * transport connection with the server. Some servers like to drop a TCP | |
173 | * connection when they are overworked, so we start with a short timeout and | |
174 | * increase over time if the server is down or not responding. | |
175 | */ | |
176 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
177 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
178 | ||
179 | /* | |
180 | * TCP idle timeout; client drops the transport socket if it is idle | |
181 | * for this long. Note that we also timeout UDP sockets to prevent | |
182 | * holding port numbers when there is no RPC traffic. | |
183 | */ | |
184 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
185 | ||
a246b010 CL |
186 | #ifdef RPC_DEBUG |
187 | # undef RPC_DEBUG_DATA | |
9903cd1c | 188 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
189 | #endif |
190 | ||
a246b010 | 191 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 192 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 193 | { |
9903cd1c CL |
194 | u8 *buf = (u8 *) packet; |
195 | int j; | |
a246b010 | 196 | |
46121cf7 | 197 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
198 | for (j = 0; j < count && j < 128; j += 4) { |
199 | if (!(j & 31)) { | |
200 | if (j) | |
201 | dprintk("\n"); | |
202 | dprintk("0x%04x ", j); | |
203 | } | |
204 | dprintk("%02x%02x%02x%02x ", | |
205 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
206 | } | |
207 | dprintk("\n"); | |
208 | } | |
209 | #else | |
9903cd1c | 210 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
211 | { |
212 | /* NOP */ | |
213 | } | |
214 | #endif | |
215 | ||
ffc2e518 CL |
216 | struct sock_xprt { |
217 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
218 | |
219 | /* | |
220 | * Network layer | |
221 | */ | |
222 | struct socket * sock; | |
223 | struct sock * inet; | |
51971139 CL |
224 | |
225 | /* | |
226 | * State of TCP reply receive | |
227 | */ | |
228 | __be32 tcp_fraghdr, | |
229 | tcp_xid; | |
230 | ||
231 | u32 tcp_offset, | |
232 | tcp_reclen; | |
233 | ||
234 | unsigned long tcp_copied, | |
235 | tcp_flags; | |
c8475461 CL |
236 | |
237 | /* | |
238 | * Connection of transports | |
239 | */ | |
34161db6 | 240 | struct delayed_work connect_worker; |
d3bc9a1d | 241 | struct sockaddr_storage addr; |
c8475461 | 242 | unsigned short port; |
7c6e066e CL |
243 | |
244 | /* | |
245 | * UDP socket buffer size parameters | |
246 | */ | |
247 | size_t rcvsize, | |
248 | sndsize; | |
314dfd79 CL |
249 | |
250 | /* | |
251 | * Saved socket callback addresses | |
252 | */ | |
253 | void (*old_data_ready)(struct sock *, int); | |
254 | void (*old_state_change)(struct sock *); | |
255 | void (*old_write_space)(struct sock *); | |
ffc2e518 CL |
256 | }; |
257 | ||
e136d092 CL |
258 | /* |
259 | * TCP receive state flags | |
260 | */ | |
261 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
262 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
263 | #define TCP_RCV_COPY_XID (1UL << 2) | |
264 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
265 | ||
ba10f2c2 | 266 | static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 CL |
267 | { |
268 | struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr; | |
269 | char *buf; | |
270 | ||
271 | buf = kzalloc(20, GFP_KERNEL); | |
272 | if (buf) { | |
bda243df | 273 | snprintf(buf, 20, NIPQUAD_FMT, |
edb267a6 CL |
274 | NIPQUAD(addr->sin_addr.s_addr)); |
275 | } | |
276 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
277 | ||
278 | buf = kzalloc(8, GFP_KERNEL); | |
279 | if (buf) { | |
280 | snprintf(buf, 8, "%u", | |
281 | ntohs(addr->sin_port)); | |
282 | } | |
283 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
284 | ||
0c43b3d8 CL |
285 | buf = kzalloc(8, GFP_KERNEL); |
286 | if (buf) { | |
287 | if (xprt->prot == IPPROTO_UDP) | |
288 | snprintf(buf, 8, "udp"); | |
289 | else | |
290 | snprintf(buf, 8, "tcp"); | |
291 | } | |
292 | xprt->address_strings[RPC_DISPLAY_PROTO] = buf; | |
edb267a6 CL |
293 | |
294 | buf = kzalloc(48, GFP_KERNEL); | |
295 | if (buf) { | |
bda243df | 296 | snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s", |
edb267a6 CL |
297 | NIPQUAD(addr->sin_addr.s_addr), |
298 | ntohs(addr->sin_port), | |
299 | xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
300 | } | |
301 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
fbfe3cc6 CL |
302 | |
303 | buf = kzalloc(10, GFP_KERNEL); | |
304 | if (buf) { | |
305 | snprintf(buf, 10, "%02x%02x%02x%02x", | |
306 | NIPQUAD(addr->sin_addr.s_addr)); | |
307 | } | |
308 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; | |
309 | ||
310 | buf = kzalloc(8, GFP_KERNEL); | |
311 | if (buf) { | |
312 | snprintf(buf, 8, "%4hx", | |
313 | ntohs(addr->sin_port)); | |
314 | } | |
315 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; | |
edb267a6 CL |
316 | } |
317 | ||
4b6473fb CL |
318 | static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt) |
319 | { | |
320 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) &xprt->addr; | |
321 | char *buf; | |
322 | ||
323 | buf = kzalloc(40, GFP_KERNEL); | |
324 | if (buf) { | |
325 | snprintf(buf, 40, NIP6_FMT, | |
326 | NIP6(addr->sin6_addr)); | |
327 | } | |
328 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
329 | ||
330 | buf = kzalloc(8, GFP_KERNEL); | |
331 | if (buf) { | |
332 | snprintf(buf, 8, "%u", | |
333 | ntohs(addr->sin6_port)); | |
334 | } | |
335 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
336 | ||
337 | buf = kzalloc(8, GFP_KERNEL); | |
338 | if (buf) { | |
339 | if (xprt->prot == IPPROTO_UDP) | |
340 | snprintf(buf, 8, "udp"); | |
341 | else | |
342 | snprintf(buf, 8, "tcp"); | |
343 | } | |
344 | xprt->address_strings[RPC_DISPLAY_PROTO] = buf; | |
345 | ||
346 | buf = kzalloc(64, GFP_KERNEL); | |
347 | if (buf) { | |
348 | snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s", | |
349 | NIP6(addr->sin6_addr), | |
350 | ntohs(addr->sin6_port), | |
351 | xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
352 | } | |
353 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
354 | ||
355 | buf = kzalloc(36, GFP_KERNEL); | |
356 | if (buf) { | |
357 | snprintf(buf, 36, NIP6_SEQFMT, | |
358 | NIP6(addr->sin6_addr)); | |
359 | } | |
360 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; | |
361 | ||
362 | buf = kzalloc(8, GFP_KERNEL); | |
363 | if (buf) { | |
364 | snprintf(buf, 8, "%4hx", | |
365 | ntohs(addr->sin6_port)); | |
366 | } | |
367 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; | |
368 | } | |
369 | ||
edb267a6 CL |
370 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) |
371 | { | |
0c43b3d8 CL |
372 | int i; |
373 | ||
374 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
375 | kfree(xprt->address_strings[i]); | |
edb267a6 CL |
376 | } |
377 | ||
b4b5cc85 CL |
378 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
379 | ||
24c5684b | 380 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 381 | { |
b4b5cc85 CL |
382 | struct msghdr msg = { |
383 | .msg_name = addr, | |
384 | .msg_namelen = addrlen, | |
24c5684b TM |
385 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
386 | }; | |
387 | struct kvec iov = { | |
388 | .iov_base = vec->iov_base + base, | |
389 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
390 | }; |
391 | ||
24c5684b | 392 | if (iov.iov_len != 0) |
b4b5cc85 CL |
393 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
394 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
395 | } | |
396 | ||
24c5684b | 397 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 398 | { |
24c5684b TM |
399 | struct page **ppage; |
400 | unsigned int remainder; | |
401 | int err, sent = 0; | |
402 | ||
403 | remainder = xdr->page_len - base; | |
404 | base += xdr->page_base; | |
405 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
406 | base &= ~PAGE_MASK; | |
407 | for(;;) { | |
408 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
409 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 410 | |
24c5684b TM |
411 | remainder -= len; |
412 | if (remainder != 0 || more) | |
413 | flags |= MSG_MORE; | |
414 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
415 | if (remainder == 0 || err != len) | |
416 | break; | |
417 | sent += err; | |
418 | ppage++; | |
419 | base = 0; | |
420 | } | |
421 | if (sent == 0) | |
422 | return err; | |
423 | if (err > 0) | |
424 | sent += err; | |
425 | return sent; | |
b4b5cc85 CL |
426 | } |
427 | ||
9903cd1c CL |
428 | /** |
429 | * xs_sendpages - write pages directly to a socket | |
430 | * @sock: socket to send on | |
431 | * @addr: UDP only -- address of destination | |
432 | * @addrlen: UDP only -- length of destination address | |
433 | * @xdr: buffer containing this request | |
434 | * @base: starting position in the buffer | |
435 | * | |
a246b010 | 436 | */ |
24c5684b | 437 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 438 | { |
24c5684b TM |
439 | unsigned int remainder = xdr->len - base; |
440 | int err, sent = 0; | |
a246b010 | 441 | |
262965f5 CL |
442 | if (unlikely(!sock)) |
443 | return -ENOTCONN; | |
444 | ||
445 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
446 | if (base != 0) { |
447 | addr = NULL; | |
448 | addrlen = 0; | |
449 | } | |
262965f5 | 450 | |
24c5684b TM |
451 | if (base < xdr->head[0].iov_len || addr != NULL) { |
452 | unsigned int len = xdr->head[0].iov_len - base; | |
453 | remainder -= len; | |
454 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
455 | if (remainder == 0 || err != len) | |
a246b010 | 456 | goto out; |
24c5684b | 457 | sent += err; |
a246b010 CL |
458 | base = 0; |
459 | } else | |
24c5684b | 460 | base -= xdr->head[0].iov_len; |
a246b010 | 461 | |
24c5684b TM |
462 | if (base < xdr->page_len) { |
463 | unsigned int len = xdr->page_len - base; | |
464 | remainder -= len; | |
465 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
466 | if (remainder == 0 || err != len) | |
a246b010 | 467 | goto out; |
24c5684b | 468 | sent += err; |
a246b010 | 469 | base = 0; |
24c5684b TM |
470 | } else |
471 | base -= xdr->page_len; | |
472 | ||
473 | if (base >= xdr->tail[0].iov_len) | |
474 | return sent; | |
475 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 476 | out: |
24c5684b TM |
477 | if (sent == 0) |
478 | return err; | |
479 | if (err > 0) | |
480 | sent += err; | |
481 | return sent; | |
a246b010 CL |
482 | } |
483 | ||
9903cd1c | 484 | /** |
262965f5 CL |
485 | * xs_nospace - place task on wait queue if transmit was incomplete |
486 | * @task: task to put to sleep | |
9903cd1c | 487 | * |
a246b010 | 488 | */ |
262965f5 | 489 | static void xs_nospace(struct rpc_task *task) |
a246b010 | 490 | { |
262965f5 CL |
491 | struct rpc_rqst *req = task->tk_rqstp; |
492 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 493 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 494 | |
46121cf7 | 495 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
496 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
497 | req->rq_slen); | |
498 | ||
ee0ac0c2 | 499 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { |
262965f5 CL |
500 | /* Protect against races with write_space */ |
501 | spin_lock_bh(&xprt->transport_lock); | |
502 | ||
503 | /* Don't race with disconnect */ | |
504 | if (!xprt_connected(xprt)) | |
505 | task->tk_status = -ENOTCONN; | |
ee0ac0c2 | 506 | else if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) |
262965f5 CL |
507 | xprt_wait_for_buffer_space(task); |
508 | ||
509 | spin_unlock_bh(&xprt->transport_lock); | |
510 | } else | |
511 | /* Keep holding the socket if it is blocked */ | |
512 | rpc_delay(task, HZ>>4); | |
513 | } | |
514 | ||
515 | /** | |
516 | * xs_udp_send_request - write an RPC request to a UDP socket | |
517 | * @task: address of RPC task that manages the state of an RPC request | |
518 | * | |
519 | * Return values: | |
520 | * 0: The request has been sent | |
521 | * EAGAIN: The socket was blocked, please call again later to | |
522 | * complete the request | |
523 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
524 | * other: Some other error occured, the request was not sent | |
525 | */ | |
526 | static int xs_udp_send_request(struct rpc_task *task) | |
527 | { | |
528 | struct rpc_rqst *req = task->tk_rqstp; | |
529 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 530 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
531 | struct xdr_buf *xdr = &req->rq_snd_buf; |
532 | int status; | |
a246b010 | 533 | |
9903cd1c | 534 | xs_pktdump("packet data:", |
a246b010 CL |
535 | req->rq_svec->iov_base, |
536 | req->rq_svec->iov_len); | |
537 | ||
262965f5 | 538 | req->rq_xtime = jiffies; |
ee0ac0c2 CL |
539 | status = xs_sendpages(transport->sock, |
540 | (struct sockaddr *) &xprt->addr, | |
541 | xprt->addrlen, xdr, | |
542 | req->rq_bytes_sent); | |
a246b010 | 543 | |
46121cf7 | 544 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 545 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 546 | |
262965f5 CL |
547 | if (likely(status >= (int) req->rq_slen)) |
548 | return 0; | |
a246b010 | 549 | |
262965f5 CL |
550 | /* Still some bytes left; set up for a retry later. */ |
551 | if (status > 0) | |
552 | status = -EAGAIN; | |
a246b010 | 553 | |
262965f5 CL |
554 | switch (status) { |
555 | case -ENETUNREACH: | |
556 | case -EPIPE: | |
a246b010 CL |
557 | case -ECONNREFUSED: |
558 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 559 | * prompts ECONNREFUSED. */ |
a246b010 | 560 | break; |
262965f5 CL |
561 | case -EAGAIN: |
562 | xs_nospace(task); | |
a246b010 CL |
563 | break; |
564 | default: | |
46121cf7 | 565 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
262965f5 | 566 | -status); |
9903cd1c | 567 | break; |
a246b010 | 568 | } |
262965f5 CL |
569 | |
570 | return status; | |
a246b010 CL |
571 | } |
572 | ||
808012fb CL |
573 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
574 | { | |
575 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
576 | rpc_fraghdr *base = buf->head[0].iov_base; | |
577 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
578 | } | |
579 | ||
9903cd1c | 580 | /** |
262965f5 | 581 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
582 | * @task: address of RPC task that manages the state of an RPC request |
583 | * | |
584 | * Return values: | |
262965f5 CL |
585 | * 0: The request has been sent |
586 | * EAGAIN: The socket was blocked, please call again later to | |
587 | * complete the request | |
588 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
589 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
590 | * |
591 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 592 | * if sendmsg is not able to make progress? |
9903cd1c | 593 | */ |
262965f5 | 594 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
595 | { |
596 | struct rpc_rqst *req = task->tk_rqstp; | |
597 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 598 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 599 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 CL |
600 | int status; |
601 | unsigned int retry = 0; | |
a246b010 | 602 | |
808012fb | 603 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 604 | |
262965f5 CL |
605 | xs_pktdump("packet data:", |
606 | req->rq_svec->iov_base, | |
607 | req->rq_svec->iov_len); | |
a246b010 CL |
608 | |
609 | /* Continue transmitting the packet/record. We must be careful | |
610 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 611 | * called sendmsg(). */ |
a246b010 CL |
612 | while (1) { |
613 | req->rq_xtime = jiffies; | |
ee0ac0c2 CL |
614 | status = xs_sendpages(transport->sock, |
615 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 616 | |
46121cf7 | 617 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 618 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 619 | |
262965f5 | 620 | if (unlikely(status < 0)) |
a246b010 | 621 | break; |
a246b010 | 622 | |
262965f5 CL |
623 | /* If we've sent the entire packet, immediately |
624 | * reset the count of bytes sent. */ | |
625 | req->rq_bytes_sent += status; | |
ef759a2e | 626 | task->tk_bytes_sent += status; |
262965f5 CL |
627 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
628 | req->rq_bytes_sent = 0; | |
629 | return 0; | |
630 | } | |
a246b010 CL |
631 | |
632 | status = -EAGAIN; | |
262965f5 | 633 | if (retry++ > XS_SENDMSG_RETRY) |
a246b010 CL |
634 | break; |
635 | } | |
636 | ||
262965f5 CL |
637 | switch (status) { |
638 | case -EAGAIN: | |
639 | xs_nospace(task); | |
640 | break; | |
641 | case -ECONNREFUSED: | |
642 | case -ECONNRESET: | |
643 | case -ENOTCONN: | |
644 | case -EPIPE: | |
645 | status = -ENOTCONN; | |
646 | break; | |
647 | default: | |
46121cf7 | 648 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
262965f5 | 649 | -status); |
43118c29 | 650 | xprt_disconnect(xprt); |
262965f5 | 651 | break; |
a246b010 | 652 | } |
262965f5 | 653 | |
a246b010 CL |
654 | return status; |
655 | } | |
656 | ||
e0ab53de TM |
657 | /** |
658 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
659 | * @xprt: transport | |
660 | * @task: rpc task | |
661 | * | |
662 | * This cleans up if an error causes us to abort the transmission of a request. | |
663 | * In this case, the socket may need to be reset in order to avoid confusing | |
664 | * the server. | |
665 | */ | |
666 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
667 | { | |
668 | struct rpc_rqst *req; | |
669 | ||
670 | if (task != xprt->snd_task) | |
671 | return; | |
672 | if (task == NULL) | |
673 | goto out_release; | |
674 | req = task->tk_rqstp; | |
675 | if (req->rq_bytes_sent == 0) | |
676 | goto out_release; | |
677 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
678 | goto out_release; | |
679 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
680 | out_release: | |
681 | xprt_release_xprt(xprt, task); | |
682 | } | |
683 | ||
9903cd1c CL |
684 | /** |
685 | * xs_close - close a socket | |
686 | * @xprt: transport | |
687 | * | |
3167e12c CL |
688 | * This is used when all requests are complete; ie, no DRC state remains |
689 | * on the server we want to save. | |
a246b010 | 690 | */ |
9903cd1c | 691 | static void xs_close(struct rpc_xprt *xprt) |
a246b010 | 692 | { |
ee0ac0c2 CL |
693 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
694 | struct socket *sock = transport->sock; | |
695 | struct sock *sk = transport->inet; | |
a246b010 CL |
696 | |
697 | if (!sk) | |
632e3bdc | 698 | goto clear_close_wait; |
a246b010 | 699 | |
46121cf7 | 700 | dprintk("RPC: xs_close xprt %p\n", xprt); |
9903cd1c | 701 | |
a246b010 | 702 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
703 | transport->inet = NULL; |
704 | transport->sock = NULL; | |
a246b010 | 705 | |
9903cd1c | 706 | sk->sk_user_data = NULL; |
314dfd79 CL |
707 | sk->sk_data_ready = transport->old_data_ready; |
708 | sk->sk_state_change = transport->old_state_change; | |
709 | sk->sk_write_space = transport->old_write_space; | |
a246b010 CL |
710 | write_unlock_bh(&sk->sk_callback_lock); |
711 | ||
9903cd1c | 712 | sk->sk_no_check = 0; |
a246b010 CL |
713 | |
714 | sock_release(sock); | |
632e3bdc TM |
715 | clear_close_wait: |
716 | smp_mb__before_clear_bit(); | |
717 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
718 | smp_mb__after_clear_bit(); | |
a246b010 CL |
719 | } |
720 | ||
9903cd1c CL |
721 | /** |
722 | * xs_destroy - prepare to shutdown a transport | |
723 | * @xprt: doomed transport | |
724 | * | |
725 | */ | |
726 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 727 | { |
c8475461 CL |
728 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
729 | ||
46121cf7 | 730 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 731 | |
c1384c9c | 732 | cancel_rearming_delayed_work(&transport->connect_worker); |
a246b010 CL |
733 | |
734 | xprt_disconnect(xprt); | |
9903cd1c | 735 | xs_close(xprt); |
edb267a6 | 736 | xs_free_peer_addresses(xprt); |
a246b010 | 737 | kfree(xprt->slot); |
c8541ecd | 738 | kfree(xprt); |
a246b010 CL |
739 | } |
740 | ||
9903cd1c CL |
741 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
742 | { | |
743 | return (struct rpc_xprt *) sk->sk_user_data; | |
744 | } | |
745 | ||
746 | /** | |
747 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
748 | * @sk: socket with data to read | |
749 | * @len: how much data to read | |
750 | * | |
a246b010 | 751 | */ |
9903cd1c | 752 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 753 | { |
9903cd1c CL |
754 | struct rpc_task *task; |
755 | struct rpc_xprt *xprt; | |
a246b010 | 756 | struct rpc_rqst *rovr; |
9903cd1c | 757 | struct sk_buff *skb; |
a246b010 | 758 | int err, repsize, copied; |
d8ed029d AD |
759 | u32 _xid; |
760 | __be32 *xp; | |
a246b010 CL |
761 | |
762 | read_lock(&sk->sk_callback_lock); | |
46121cf7 | 763 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 764 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 765 | goto out; |
a246b010 CL |
766 | |
767 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
768 | goto out; | |
769 | ||
770 | if (xprt->shutdown) | |
771 | goto dropit; | |
772 | ||
773 | repsize = skb->len - sizeof(struct udphdr); | |
774 | if (repsize < 4) { | |
46121cf7 | 775 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
776 | goto dropit; |
777 | } | |
778 | ||
779 | /* Copy the XID from the skb... */ | |
780 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
781 | sizeof(_xid), &_xid); | |
782 | if (xp == NULL) | |
783 | goto dropit; | |
784 | ||
785 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 786 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
787 | rovr = xprt_lookup_rqst(xprt, *xp); |
788 | if (!rovr) | |
789 | goto out_unlock; | |
790 | task = rovr->rq_task; | |
791 | ||
a246b010 CL |
792 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
793 | copied = repsize; | |
794 | ||
795 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
796 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) | |
797 | goto out_unlock; | |
798 | ||
799 | /* Something worked... */ | |
800 | dst_confirm(skb->dst); | |
801 | ||
1570c1e4 CL |
802 | xprt_adjust_cwnd(task, copied); |
803 | xprt_update_rtt(task); | |
804 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
805 | |
806 | out_unlock: | |
4a0f8c04 | 807 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
808 | dropit: |
809 | skb_free_datagram(sk, skb); | |
810 | out: | |
811 | read_unlock(&sk->sk_callback_lock); | |
812 | } | |
813 | ||
dd456471 | 814 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 815 | { |
51971139 | 816 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
817 | size_t len, used; |
818 | char *p; | |
819 | ||
51971139 CL |
820 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
821 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 822 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 823 | transport->tcp_offset += used; |
a246b010 CL |
824 | if (used != len) |
825 | return; | |
808012fb | 826 | |
51971139 CL |
827 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
828 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 829 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 830 | else |
e136d092 | 831 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 832 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 833 | |
e136d092 | 834 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 835 | transport->tcp_offset = 0; |
808012fb | 836 | |
a246b010 | 837 | /* Sanity check of the record length */ |
51971139 | 838 | if (unlikely(transport->tcp_reclen < 4)) { |
46121cf7 | 839 | dprintk("RPC: invalid TCP record fragment length\n"); |
a246b010 | 840 | xprt_disconnect(xprt); |
9903cd1c | 841 | return; |
a246b010 | 842 | } |
46121cf7 | 843 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 844 | transport->tcp_reclen); |
a246b010 CL |
845 | } |
846 | ||
51971139 | 847 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 848 | { |
51971139 | 849 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 850 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 851 | transport->tcp_offset = 0; |
e136d092 CL |
852 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
853 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
854 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 855 | transport->tcp_copied = 0; |
a246b010 CL |
856 | } |
857 | } | |
858 | } | |
859 | ||
dd456471 | 860 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
861 | { |
862 | size_t len, used; | |
863 | char *p; | |
864 | ||
51971139 | 865 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 866 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 867 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 868 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 869 | transport->tcp_offset += used; |
a246b010 CL |
870 | if (used != len) |
871 | return; | |
e136d092 CL |
872 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
873 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
51971139 | 874 | transport->tcp_copied = 4; |
46121cf7 | 875 | dprintk("RPC: reading reply for XID %08x\n", |
51971139 CL |
876 | ntohl(transport->tcp_xid)); |
877 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
878 | } |
879 | ||
dd456471 | 880 | static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 881 | { |
51971139 | 882 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
883 | struct rpc_rqst *req; |
884 | struct xdr_buf *rcvbuf; | |
885 | size_t len; | |
886 | ssize_t r; | |
887 | ||
888 | /* Find and lock the request corresponding to this xid */ | |
4a0f8c04 | 889 | spin_lock(&xprt->transport_lock); |
51971139 | 890 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
a246b010 | 891 | if (!req) { |
e136d092 | 892 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 893 | dprintk("RPC: XID %08x request not found!\n", |
51971139 | 894 | ntohl(transport->tcp_xid)); |
4a0f8c04 | 895 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
896 | return; |
897 | } | |
898 | ||
899 | rcvbuf = &req->rq_private_buf; | |
900 | len = desc->count; | |
51971139 | 901 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 902 | struct xdr_skb_reader my_desc; |
a246b010 | 903 | |
51971139 | 904 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
905 | memcpy(&my_desc, desc, sizeof(my_desc)); |
906 | my_desc.count = len; | |
51971139 | 907 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 908 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
909 | desc->count -= r; |
910 | desc->offset += r; | |
911 | } else | |
51971139 | 912 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 913 | desc, xdr_skb_read_bits); |
a246b010 CL |
914 | |
915 | if (r > 0) { | |
51971139 CL |
916 | transport->tcp_copied += r; |
917 | transport->tcp_offset += r; | |
a246b010 CL |
918 | } |
919 | if (r != len) { | |
920 | /* Error when copying to the receive buffer, | |
921 | * usually because we weren't able to allocate | |
922 | * additional buffer pages. All we can do now | |
e136d092 | 923 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
924 | * will not receive any additional updates, |
925 | * and time out. | |
926 | * Any remaining data from this record will | |
927 | * be discarded. | |
928 | */ | |
e136d092 | 929 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 930 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 931 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
932 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
933 | "tcp_offset = %u, tcp_reclen = %u\n", | |
934 | xprt, transport->tcp_copied, | |
935 | transport->tcp_offset, transport->tcp_reclen); | |
a246b010 CL |
936 | goto out; |
937 | } | |
938 | ||
46121cf7 | 939 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 940 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
941 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
942 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
943 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
944 | |
945 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 946 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 947 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
948 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
949 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 CL |
950 | } |
951 | ||
952 | out: | |
e136d092 | 953 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 954 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
4a0f8c04 | 955 | spin_unlock(&xprt->transport_lock); |
51971139 | 956 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
957 | } |
958 | ||
dd456471 | 959 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
960 | { |
961 | size_t len; | |
962 | ||
51971139 | 963 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
964 | if (len > desc->count) |
965 | len = desc->count; | |
966 | desc->count -= len; | |
967 | desc->offset += len; | |
51971139 | 968 | transport->tcp_offset += len; |
46121cf7 | 969 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 970 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
971 | } |
972 | ||
9903cd1c | 973 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
974 | { |
975 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 976 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 977 | struct xdr_skb_reader desc = { |
a246b010 CL |
978 | .skb = skb, |
979 | .offset = offset, | |
980 | .count = len, | |
9903cd1c | 981 | }; |
a246b010 | 982 | |
46121cf7 | 983 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
984 | do { |
985 | /* Read in a new fragment marker if necessary */ | |
986 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 987 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 988 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
989 | continue; |
990 | } | |
991 | /* Read in the xid if necessary */ | |
e136d092 | 992 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 993 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
994 | continue; |
995 | } | |
996 | /* Read in the request data */ | |
e136d092 | 997 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
9903cd1c | 998 | xs_tcp_read_request(xprt, &desc); |
a246b010 CL |
999 | continue; |
1000 | } | |
1001 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1002 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1003 | } while (desc.count); |
46121cf7 | 1004 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1005 | return len - desc.count; |
1006 | } | |
1007 | ||
9903cd1c CL |
1008 | /** |
1009 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1010 | * @sk: socket with data to read | |
1011 | * @bytes: how much data to read | |
1012 | * | |
1013 | */ | |
1014 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1015 | { |
1016 | struct rpc_xprt *xprt; | |
1017 | read_descriptor_t rd_desc; | |
1018 | ||
46121cf7 CL |
1019 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1020 | ||
a246b010 | 1021 | read_lock(&sk->sk_callback_lock); |
9903cd1c | 1022 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1023 | goto out; |
a246b010 CL |
1024 | if (xprt->shutdown) |
1025 | goto out; | |
1026 | ||
9903cd1c | 1027 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 CL |
1028 | rd_desc.arg.data = xprt; |
1029 | rd_desc.count = 65536; | |
9903cd1c | 1030 | tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
a246b010 CL |
1031 | out: |
1032 | read_unlock(&sk->sk_callback_lock); | |
1033 | } | |
1034 | ||
9903cd1c CL |
1035 | /** |
1036 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1037 | * @sk: socket whose state has changed | |
1038 | * | |
1039 | */ | |
1040 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1041 | { |
9903cd1c | 1042 | struct rpc_xprt *xprt; |
a246b010 CL |
1043 | |
1044 | read_lock(&sk->sk_callback_lock); | |
1045 | if (!(xprt = xprt_from_sock(sk))) | |
1046 | goto out; | |
46121cf7 CL |
1047 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1048 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", | |
1049 | sk->sk_state, xprt_connected(xprt), | |
1050 | sock_flag(sk, SOCK_DEAD), | |
1051 | sock_flag(sk, SOCK_ZAPPED)); | |
a246b010 CL |
1052 | |
1053 | switch (sk->sk_state) { | |
1054 | case TCP_ESTABLISHED: | |
4a0f8c04 | 1055 | spin_lock_bh(&xprt->transport_lock); |
a246b010 | 1056 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1057 | struct sock_xprt *transport = container_of(xprt, |
1058 | struct sock_xprt, xprt); | |
1059 | ||
a246b010 | 1060 | /* Reset TCP record info */ |
51971139 CL |
1061 | transport->tcp_offset = 0; |
1062 | transport->tcp_reclen = 0; | |
1063 | transport->tcp_copied = 0; | |
e136d092 CL |
1064 | transport->tcp_flags = |
1065 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1066 | |
03bf4b70 | 1067 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
44fbac22 | 1068 | xprt_wake_pending_tasks(xprt, 0); |
a246b010 | 1069 | } |
4a0f8c04 | 1070 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 CL |
1071 | break; |
1072 | case TCP_SYN_SENT: | |
1073 | case TCP_SYN_RECV: | |
1074 | break; | |
632e3bdc TM |
1075 | case TCP_CLOSE_WAIT: |
1076 | /* Try to schedule an autoclose RPC calls */ | |
1077 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1078 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
c1384c9c | 1079 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
a246b010 CL |
1080 | default: |
1081 | xprt_disconnect(xprt); | |
a246b010 CL |
1082 | } |
1083 | out: | |
1084 | read_unlock(&sk->sk_callback_lock); | |
1085 | } | |
1086 | ||
9903cd1c | 1087 | /** |
c7b2cae8 CL |
1088 | * xs_udp_write_space - callback invoked when socket buffer space |
1089 | * becomes available | |
9903cd1c CL |
1090 | * @sk: socket whose state has changed |
1091 | * | |
a246b010 CL |
1092 | * Called when more output buffer space is available for this socket. |
1093 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1094 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1095 | * with a bunch of small requests. |
1096 | */ | |
c7b2cae8 | 1097 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1098 | { |
a246b010 | 1099 | read_lock(&sk->sk_callback_lock); |
a246b010 | 1100 | |
c7b2cae8 CL |
1101 | /* from net/core/sock.c:sock_def_write_space */ |
1102 | if (sock_writeable(sk)) { | |
1103 | struct socket *sock; | |
1104 | struct rpc_xprt *xprt; | |
1105 | ||
1106 | if (unlikely(!(sock = sk->sk_socket))) | |
a246b010 | 1107 | goto out; |
c7b2cae8 CL |
1108 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
1109 | goto out; | |
1110 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
a246b010 | 1111 | goto out; |
c7b2cae8 CL |
1112 | |
1113 | xprt_write_space(xprt); | |
a246b010 CL |
1114 | } |
1115 | ||
c7b2cae8 CL |
1116 | out: |
1117 | read_unlock(&sk->sk_callback_lock); | |
1118 | } | |
a246b010 | 1119 | |
c7b2cae8 CL |
1120 | /** |
1121 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1122 | * becomes available | |
1123 | * @sk: socket whose state has changed | |
1124 | * | |
1125 | * Called when more output buffer space is available for this socket. | |
1126 | * We try not to wake our writers until they can make "significant" | |
1127 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1128 | * with a bunch of small requests. | |
1129 | */ | |
1130 | static void xs_tcp_write_space(struct sock *sk) | |
1131 | { | |
1132 | read_lock(&sk->sk_callback_lock); | |
1133 | ||
1134 | /* from net/core/stream.c:sk_stream_write_space */ | |
1135 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
1136 | struct socket *sock; | |
1137 | struct rpc_xprt *xprt; | |
1138 | ||
1139 | if (unlikely(!(sock = sk->sk_socket))) | |
1140 | goto out; | |
1141 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1142 | goto out; | |
1143 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
1144 | goto out; | |
1145 | ||
1146 | xprt_write_space(xprt); | |
1147 | } | |
1148 | ||
1149 | out: | |
a246b010 CL |
1150 | read_unlock(&sk->sk_callback_lock); |
1151 | } | |
1152 | ||
470056c2 | 1153 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1154 | { |
ee0ac0c2 CL |
1155 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1156 | struct sock *sk = transport->inet; | |
a246b010 | 1157 | |
7c6e066e | 1158 | if (transport->rcvsize) { |
a246b010 | 1159 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1160 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1161 | } |
7c6e066e | 1162 | if (transport->sndsize) { |
a246b010 | 1163 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1164 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1165 | sk->sk_write_space(sk); |
1166 | } | |
1167 | } | |
1168 | ||
43118c29 | 1169 | /** |
470056c2 | 1170 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1171 | * @xprt: generic transport |
470056c2 CL |
1172 | * @sndsize: requested size of send buffer, in bytes |
1173 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1174 | * |
470056c2 | 1175 | * Set socket send and receive buffer size limits. |
43118c29 | 1176 | */ |
470056c2 | 1177 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1178 | { |
7c6e066e CL |
1179 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1180 | ||
1181 | transport->sndsize = 0; | |
470056c2 | 1182 | if (sndsize) |
7c6e066e CL |
1183 | transport->sndsize = sndsize + 1024; |
1184 | transport->rcvsize = 0; | |
470056c2 | 1185 | if (rcvsize) |
7c6e066e | 1186 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1187 | |
1188 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1189 | } |
1190 | ||
46c0ee8b CL |
1191 | /** |
1192 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1193 | * @task: task that timed out | |
1194 | * | |
1195 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1196 | */ | |
1197 | static void xs_udp_timer(struct rpc_task *task) | |
1198 | { | |
1199 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1200 | } | |
1201 | ||
b85d8806 CL |
1202 | static unsigned short xs_get_random_port(void) |
1203 | { | |
1204 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1205 | unsigned short rand = (unsigned short) net_random() % range; | |
1206 | return rand + xprt_min_resvport; | |
1207 | } | |
1208 | ||
92200412 CL |
1209 | /** |
1210 | * xs_set_port - reset the port number in the remote endpoint address | |
1211 | * @xprt: generic transport | |
1212 | * @port: new port number | |
1213 | * | |
1214 | */ | |
1215 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1216 | { | |
20612005 | 1217 | struct sockaddr *addr = (struct sockaddr *) &xprt->addr; |
c4efcb1d | 1218 | |
46121cf7 | 1219 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1220 | |
20612005 CL |
1221 | switch (addr->sa_family) { |
1222 | case AF_INET: | |
1223 | ((struct sockaddr_in *)addr)->sin_port = htons(port); | |
1224 | break; | |
1225 | case AF_INET6: | |
1226 | ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); | |
1227 | break; | |
1228 | default: | |
1229 | BUG(); | |
1230 | } | |
92200412 CL |
1231 | } |
1232 | ||
7dc753f0 | 1233 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
a246b010 CL |
1234 | { |
1235 | struct sockaddr_in myaddr = { | |
1236 | .sin_family = AF_INET, | |
1237 | }; | |
d3bc9a1d | 1238 | struct sockaddr_in *sa; |
529b33c6 | 1239 | int err; |
c8475461 | 1240 | unsigned short port = transport->port; |
a246b010 | 1241 | |
d3bc9a1d FM |
1242 | if (!transport->xprt.resvport) |
1243 | port = 0; | |
1244 | sa = (struct sockaddr_in *)&transport->addr; | |
1245 | myaddr.sin_addr = sa->sin_addr; | |
a246b010 CL |
1246 | do { |
1247 | myaddr.sin_port = htons(port); | |
e6242e92 | 1248 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 | 1249 | sizeof(myaddr)); |
d3bc9a1d FM |
1250 | if (!transport->xprt.resvport) |
1251 | break; | |
a246b010 | 1252 | if (err == 0) { |
c8475461 | 1253 | transport->port = port; |
d3bc9a1d | 1254 | break; |
a246b010 | 1255 | } |
529b33c6 CL |
1256 | if (port <= xprt_min_resvport) |
1257 | port = xprt_max_resvport; | |
1258 | else | |
1259 | port--; | |
c8475461 | 1260 | } while (err == -EADDRINUSE && port != transport->port); |
7dc753f0 CL |
1261 | dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n", |
1262 | __FUNCTION__, NIPQUAD(myaddr.sin_addr), | |
1263 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1264 | return err; |
1265 | } | |
1266 | ||
90058d37 CL |
1267 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1268 | { | |
1269 | struct sockaddr_in6 myaddr = { | |
1270 | .sin6_family = AF_INET6, | |
1271 | }; | |
1272 | struct sockaddr_in6 *sa; | |
1273 | int err; | |
1274 | unsigned short port = transport->port; | |
1275 | ||
1276 | if (!transport->xprt.resvport) | |
1277 | port = 0; | |
1278 | sa = (struct sockaddr_in6 *)&transport->addr; | |
1279 | myaddr.sin6_addr = sa->sin6_addr; | |
1280 | do { | |
1281 | myaddr.sin6_port = htons(port); | |
1282 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, | |
1283 | sizeof(myaddr)); | |
1284 | if (!transport->xprt.resvport) | |
1285 | break; | |
1286 | if (err == 0) { | |
1287 | transport->port = port; | |
1288 | break; | |
1289 | } | |
1290 | if (port <= xprt_min_resvport) | |
1291 | port = xprt_max_resvport; | |
1292 | else | |
1293 | port--; | |
1294 | } while (err == -EADDRINUSE && port != transport->port); | |
1295 | dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n", | |
1296 | NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err); | |
1297 | return err; | |
1298 | } | |
1299 | ||
ed07536e PZ |
1300 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1301 | static struct lock_class_key xs_key[2]; | |
1302 | static struct lock_class_key xs_slock_key[2]; | |
1303 | ||
1304 | static inline void xs_reclassify_socket(struct socket *sock) | |
1305 | { | |
1306 | struct sock *sk = sock->sk; | |
1307 | BUG_ON(sk->sk_lock.owner != NULL); | |
1308 | switch (sk->sk_family) { | |
1309 | case AF_INET: | |
1310 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS", | |
1311 | &xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]); | |
1312 | break; | |
1313 | ||
1314 | case AF_INET6: | |
1315 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS", | |
1316 | &xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]); | |
1317 | break; | |
1318 | ||
1319 | default: | |
1320 | BUG(); | |
1321 | } | |
1322 | } | |
1323 | #else | |
1324 | static inline void xs_reclassify_socket(struct socket *sock) | |
1325 | { | |
1326 | } | |
1327 | #endif | |
1328 | ||
16be2d20 CL |
1329 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1330 | { | |
1331 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1332 | ||
1333 | if (!transport->inet) { | |
1334 | struct sock *sk = sock->sk; | |
1335 | ||
1336 | write_lock_bh(&sk->sk_callback_lock); | |
1337 | ||
1338 | sk->sk_user_data = xprt; | |
1339 | transport->old_data_ready = sk->sk_data_ready; | |
1340 | transport->old_state_change = sk->sk_state_change; | |
1341 | transport->old_write_space = sk->sk_write_space; | |
1342 | sk->sk_data_ready = xs_udp_data_ready; | |
1343 | sk->sk_write_space = xs_udp_write_space; | |
1344 | sk->sk_no_check = UDP_CSUM_NORCV; | |
1345 | sk->sk_allocation = GFP_ATOMIC; | |
1346 | ||
1347 | xprt_set_connected(xprt); | |
1348 | ||
1349 | /* Reset to new socket */ | |
1350 | transport->sock = sock; | |
1351 | transport->inet = sk; | |
1352 | ||
1353 | write_unlock_bh(&sk->sk_callback_lock); | |
1354 | } | |
1355 | xs_udp_do_set_buffer_size(xprt); | |
1356 | } | |
1357 | ||
b0d93ad5 | 1358 | /** |
9c3d72de | 1359 | * xs_udp_connect_worker4 - set up a UDP socket |
65f27f38 | 1360 | * @work: RPC transport to connect |
b0d93ad5 CL |
1361 | * |
1362 | * Invoked by a work queue tasklet. | |
1363 | */ | |
9c3d72de | 1364 | static void xs_udp_connect_worker4(struct work_struct *work) |
a246b010 | 1365 | { |
34161db6 TM |
1366 | struct sock_xprt *transport = |
1367 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1368 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1369 | struct socket *sock = transport->sock; |
b0d93ad5 | 1370 | int err, status = -EIO; |
9903cd1c | 1371 | |
ec739ef0 | 1372 | if (xprt->shutdown || !xprt_bound(xprt)) |
b0d93ad5 | 1373 | goto out; |
9903cd1c | 1374 | |
b0d93ad5 CL |
1375 | /* Start by resetting any existing state */ |
1376 | xs_close(xprt); | |
9903cd1c | 1377 | |
b0d93ad5 | 1378 | if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { |
46121cf7 | 1379 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
b0d93ad5 CL |
1380 | goto out; |
1381 | } | |
ed07536e | 1382 | xs_reclassify_socket(sock); |
9903cd1c | 1383 | |
7dc753f0 | 1384 | if (xs_bind4(transport, sock)) { |
b0d93ad5 CL |
1385 | sock_release(sock); |
1386 | goto out; | |
1387 | } | |
9903cd1c | 1388 | |
46121cf7 | 1389 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
7559c7a2 | 1390 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1391 | |
16be2d20 | 1392 | xs_udp_finish_connecting(xprt, sock); |
b0d93ad5 CL |
1393 | status = 0; |
1394 | out: | |
1395 | xprt_wake_pending_tasks(xprt, status); | |
1396 | xprt_clear_connecting(xprt); | |
a246b010 CL |
1397 | } |
1398 | ||
68e220bd CL |
1399 | /** |
1400 | * xs_udp_connect_worker6 - set up a UDP socket | |
1401 | * @work: RPC transport to connect | |
1402 | * | |
1403 | * Invoked by a work queue tasklet. | |
1404 | */ | |
1405 | static void xs_udp_connect_worker6(struct work_struct *work) | |
1406 | { | |
1407 | struct sock_xprt *transport = | |
1408 | container_of(work, struct sock_xprt, connect_worker.work); | |
1409 | struct rpc_xprt *xprt = &transport->xprt; | |
1410 | struct socket *sock = transport->sock; | |
1411 | int err, status = -EIO; | |
1412 | ||
1413 | if (xprt->shutdown || !xprt_bound(xprt)) | |
1414 | goto out; | |
1415 | ||
1416 | /* Start by resetting any existing state */ | |
1417 | xs_close(xprt); | |
1418 | ||
1419 | if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { | |
1420 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); | |
1421 | goto out; | |
1422 | } | |
1423 | xs_reclassify_socket(sock); | |
1424 | ||
1425 | if (xs_bind6(transport, sock) < 0) { | |
1426 | sock_release(sock); | |
1427 | goto out; | |
1428 | } | |
1429 | ||
1430 | dprintk("RPC: worker connecting xprt %p to address: %s\n", | |
1431 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); | |
1432 | ||
1433 | xs_udp_finish_connecting(xprt, sock); | |
1434 | status = 0; | |
1435 | out: | |
1436 | xprt_wake_pending_tasks(xprt, status); | |
1437 | xprt_clear_connecting(xprt); | |
1438 | } | |
1439 | ||
3167e12c CL |
1440 | /* |
1441 | * We need to preserve the port number so the reply cache on the server can | |
1442 | * find our cached RPC replies when we get around to reconnecting. | |
1443 | */ | |
1444 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) | |
1445 | { | |
1446 | int result; | |
ee0ac0c2 | 1447 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
3167e12c CL |
1448 | struct sockaddr any; |
1449 | ||
46121cf7 | 1450 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
3167e12c CL |
1451 | |
1452 | /* | |
1453 | * Disconnect the transport socket by doing a connect operation | |
1454 | * with AF_UNSPEC. This should return immediately... | |
1455 | */ | |
1456 | memset(&any, 0, sizeof(any)); | |
1457 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1458 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
3167e12c | 1459 | if (result) |
46121cf7 | 1460 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
1461 | result); |
1462 | } | |
1463 | ||
16be2d20 | 1464 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 1465 | { |
16be2d20 | 1466 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
edb267a6 | 1467 | |
ee0ac0c2 | 1468 | if (!transport->inet) { |
b0d93ad5 CL |
1469 | struct sock *sk = sock->sk; |
1470 | ||
1471 | write_lock_bh(&sk->sk_callback_lock); | |
1472 | ||
1473 | sk->sk_user_data = xprt; | |
314dfd79 CL |
1474 | transport->old_data_ready = sk->sk_data_ready; |
1475 | transport->old_state_change = sk->sk_state_change; | |
1476 | transport->old_write_space = sk->sk_write_space; | |
b0d93ad5 CL |
1477 | sk->sk_data_ready = xs_tcp_data_ready; |
1478 | sk->sk_state_change = xs_tcp_state_change; | |
1479 | sk->sk_write_space = xs_tcp_write_space; | |
b079fa7b | 1480 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1481 | |
1482 | /* socket options */ | |
1483 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1484 | sock_reset_flag(sk, SOCK_LINGER); | |
1485 | tcp_sk(sk)->linger2 = 0; | |
1486 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1487 | |
1488 | xprt_clear_connected(xprt); | |
1489 | ||
1490 | /* Reset to new socket */ | |
ee0ac0c2 CL |
1491 | transport->sock = sock; |
1492 | transport->inet = sk; | |
b0d93ad5 CL |
1493 | |
1494 | write_unlock_bh(&sk->sk_callback_lock); | |
1495 | } | |
1496 | ||
1497 | /* Tell the socket layer to start connecting... */ | |
262ca07d CL |
1498 | xprt->stat.connect_count++; |
1499 | xprt->stat.connect_start = jiffies; | |
16be2d20 | 1500 | return kernel_connect(sock, (struct sockaddr *) &xprt->addr, |
c4efcb1d | 1501 | xprt->addrlen, O_NONBLOCK); |
16be2d20 CL |
1502 | } |
1503 | ||
1504 | /** | |
9c3d72de | 1505 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
16be2d20 CL |
1506 | * @work: RPC transport to connect |
1507 | * | |
1508 | * Invoked by a work queue tasklet. | |
1509 | */ | |
9c3d72de | 1510 | static void xs_tcp_connect_worker4(struct work_struct *work) |
16be2d20 CL |
1511 | { |
1512 | struct sock_xprt *transport = | |
1513 | container_of(work, struct sock_xprt, connect_worker.work); | |
1514 | struct rpc_xprt *xprt = &transport->xprt; | |
1515 | struct socket *sock = transport->sock; | |
1516 | int err, status = -EIO; | |
1517 | ||
1518 | if (xprt->shutdown || !xprt_bound(xprt)) | |
1519 | goto out; | |
1520 | ||
1521 | if (!sock) { | |
1522 | /* start from scratch */ | |
1523 | if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { | |
1524 | dprintk("RPC: can't create TCP transport socket (%d).\n", -err); | |
1525 | goto out; | |
1526 | } | |
1527 | xs_reclassify_socket(sock); | |
1528 | ||
1529 | if (xs_bind4(transport, sock) < 0) { | |
1530 | sock_release(sock); | |
1531 | goto out; | |
1532 | } | |
1533 | } else | |
1534 | /* "close" the socket, preserving the local port */ | |
1535 | xs_tcp_reuse_connection(xprt); | |
1536 | ||
1537 | dprintk("RPC: worker connecting xprt %p to address: %s\n", | |
1538 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); | |
1539 | ||
1540 | status = xs_tcp_finish_connecting(xprt, sock); | |
46121cf7 CL |
1541 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1542 | xprt, -status, xprt_connected(xprt), | |
1543 | sock->sk->sk_state); | |
a246b010 CL |
1544 | if (status < 0) { |
1545 | switch (status) { | |
1546 | case -EINPROGRESS: | |
1547 | case -EALREADY: | |
1548 | goto out_clear; | |
3167e12c CL |
1549 | case -ECONNREFUSED: |
1550 | case -ECONNRESET: | |
1551 | /* retry with existing socket, after a delay */ | |
1552 | break; | |
1553 | default: | |
1554 | /* get rid of existing socket, and retry */ | |
1555 | xs_close(xprt); | |
1556 | break; | |
a246b010 CL |
1557 | } |
1558 | } | |
1559 | out: | |
44fbac22 | 1560 | xprt_wake_pending_tasks(xprt, status); |
68e220bd CL |
1561 | out_clear: |
1562 | xprt_clear_connecting(xprt); | |
1563 | } | |
1564 | ||
1565 | /** | |
1566 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint | |
1567 | * @work: RPC transport to connect | |
1568 | * | |
1569 | * Invoked by a work queue tasklet. | |
1570 | */ | |
1571 | static void xs_tcp_connect_worker6(struct work_struct *work) | |
1572 | { | |
1573 | struct sock_xprt *transport = | |
1574 | container_of(work, struct sock_xprt, connect_worker.work); | |
1575 | struct rpc_xprt *xprt = &transport->xprt; | |
1576 | struct socket *sock = transport->sock; | |
1577 | int err, status = -EIO; | |
1578 | ||
1579 | if (xprt->shutdown || !xprt_bound(xprt)) | |
1580 | goto out; | |
1581 | ||
1582 | if (!sock) { | |
1583 | /* start from scratch */ | |
1584 | if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { | |
1585 | dprintk("RPC: can't create TCP transport socket (%d).\n", -err); | |
1586 | goto out; | |
1587 | } | |
1588 | xs_reclassify_socket(sock); | |
1589 | ||
1590 | if (xs_bind6(transport, sock) < 0) { | |
1591 | sock_release(sock); | |
1592 | goto out; | |
1593 | } | |
1594 | } else | |
1595 | /* "close" the socket, preserving the local port */ | |
1596 | xs_tcp_reuse_connection(xprt); | |
1597 | ||
1598 | dprintk("RPC: worker connecting xprt %p to address: %s\n", | |
1599 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); | |
1600 | ||
1601 | status = xs_tcp_finish_connecting(xprt, sock); | |
1602 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", | |
1603 | xprt, -status, xprt_connected(xprt), sock->sk->sk_state); | |
1604 | if (status < 0) { | |
1605 | switch (status) { | |
1606 | case -EINPROGRESS: | |
1607 | case -EALREADY: | |
1608 | goto out_clear; | |
1609 | case -ECONNREFUSED: | |
1610 | case -ECONNRESET: | |
1611 | /* retry with existing socket, after a delay */ | |
1612 | break; | |
1613 | default: | |
1614 | /* get rid of existing socket, and retry */ | |
1615 | xs_close(xprt); | |
1616 | break; | |
1617 | } | |
1618 | } | |
1619 | out: | |
1620 | xprt_wake_pending_tasks(xprt, status); | |
a246b010 | 1621 | out_clear: |
2226feb6 | 1622 | xprt_clear_connecting(xprt); |
a246b010 CL |
1623 | } |
1624 | ||
9903cd1c CL |
1625 | /** |
1626 | * xs_connect - connect a socket to a remote endpoint | |
1627 | * @task: address of RPC task that manages state of connect request | |
1628 | * | |
1629 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
1630 | * |
1631 | * UDP socket connects are synchronous, but we use a work queue anyway | |
1632 | * to guarantee that even unprivileged user processes can set up a | |
1633 | * socket on a privileged port. | |
1634 | * | |
1635 | * If a UDP socket connect fails, the delay behavior here prevents | |
1636 | * retry floods (hard mounts). | |
9903cd1c CL |
1637 | */ |
1638 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
1639 | { |
1640 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 1641 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1642 | |
b0d93ad5 CL |
1643 | if (xprt_test_and_set_connecting(xprt)) |
1644 | return; | |
1645 | ||
ee0ac0c2 | 1646 | if (transport->sock != NULL) { |
46121cf7 CL |
1647 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
1648 | "seconds\n", | |
03bf4b70 | 1649 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
1650 | queue_delayed_work(rpciod_workqueue, |
1651 | &transport->connect_worker, | |
1652 | xprt->reestablish_timeout); | |
03bf4b70 CL |
1653 | xprt->reestablish_timeout <<= 1; |
1654 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) | |
1655 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 1656 | } else { |
46121cf7 | 1657 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
1658 | queue_delayed_work(rpciod_workqueue, |
1659 | &transport->connect_worker, 0); | |
a246b010 CL |
1660 | } |
1661 | } | |
1662 | ||
262ca07d CL |
1663 | /** |
1664 | * xs_udp_print_stats - display UDP socket-specifc stats | |
1665 | * @xprt: rpc_xprt struct containing statistics | |
1666 | * @seq: output file | |
1667 | * | |
1668 | */ | |
1669 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1670 | { | |
c8475461 CL |
1671 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1672 | ||
262ca07d | 1673 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
c8475461 | 1674 | transport->port, |
262ca07d CL |
1675 | xprt->stat.bind_count, |
1676 | xprt->stat.sends, | |
1677 | xprt->stat.recvs, | |
1678 | xprt->stat.bad_xids, | |
1679 | xprt->stat.req_u, | |
1680 | xprt->stat.bklog_u); | |
1681 | } | |
1682 | ||
1683 | /** | |
1684 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
1685 | * @xprt: rpc_xprt struct containing statistics | |
1686 | * @seq: output file | |
1687 | * | |
1688 | */ | |
1689 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1690 | { | |
c8475461 | 1691 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
1692 | long idle_time = 0; |
1693 | ||
1694 | if (xprt_connected(xprt)) | |
1695 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
1696 | ||
1697 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
c8475461 | 1698 | transport->port, |
262ca07d CL |
1699 | xprt->stat.bind_count, |
1700 | xprt->stat.connect_count, | |
1701 | xprt->stat.connect_time, | |
1702 | idle_time, | |
1703 | xprt->stat.sends, | |
1704 | xprt->stat.recvs, | |
1705 | xprt->stat.bad_xids, | |
1706 | xprt->stat.req_u, | |
1707 | xprt->stat.bklog_u); | |
1708 | } | |
1709 | ||
262965f5 | 1710 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 1711 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 1712 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 1713 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 1714 | .rpcbind = rpcb_getport_async, |
92200412 | 1715 | .set_port = xs_set_port, |
262965f5 | 1716 | .connect = xs_connect, |
02107148 CL |
1717 | .buf_alloc = rpc_malloc, |
1718 | .buf_free = rpc_free, | |
262965f5 | 1719 | .send_request = xs_udp_send_request, |
fe3aca29 | 1720 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 1721 | .timer = xs_udp_timer, |
a58dd398 | 1722 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
1723 | .close = xs_close, |
1724 | .destroy = xs_destroy, | |
262ca07d | 1725 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
1726 | }; |
1727 | ||
1728 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 1729 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 1730 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 1731 | .rpcbind = rpcb_getport_async, |
92200412 | 1732 | .set_port = xs_set_port, |
9903cd1c | 1733 | .connect = xs_connect, |
02107148 CL |
1734 | .buf_alloc = rpc_malloc, |
1735 | .buf_free = rpc_free, | |
262965f5 | 1736 | .send_request = xs_tcp_send_request, |
fe3aca29 | 1737 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
9903cd1c CL |
1738 | .close = xs_close, |
1739 | .destroy = xs_destroy, | |
262ca07d | 1740 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
1741 | }; |
1742 | ||
96802a09 | 1743 | static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args, unsigned int slot_table_size) |
c8541ecd CL |
1744 | { |
1745 | struct rpc_xprt *xprt; | |
ffc2e518 | 1746 | struct sock_xprt *new; |
c8541ecd | 1747 | |
96802a09 | 1748 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 1749 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
1750 | return ERR_PTR(-EBADF); |
1751 | } | |
1752 | ||
ffc2e518 CL |
1753 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1754 | if (new == NULL) { | |
46121cf7 CL |
1755 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
1756 | "rpc_xprt\n"); | |
c8541ecd CL |
1757 | return ERR_PTR(-ENOMEM); |
1758 | } | |
ffc2e518 | 1759 | xprt = &new->xprt; |
c8541ecd CL |
1760 | |
1761 | xprt->max_reqs = slot_table_size; | |
1762 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); | |
1763 | if (xprt->slot == NULL) { | |
1764 | kfree(xprt); | |
46121cf7 CL |
1765 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
1766 | "table\n"); | |
c8541ecd CL |
1767 | return ERR_PTR(-ENOMEM); |
1768 | } | |
1769 | ||
96802a09 FM |
1770 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
1771 | xprt->addrlen = args->addrlen; | |
d3bc9a1d FM |
1772 | if (args->srcaddr) |
1773 | memcpy(&new->addr, args->srcaddr, args->addrlen); | |
c8475461 | 1774 | new->port = xs_get_random_port(); |
c8541ecd CL |
1775 | |
1776 | return xprt; | |
1777 | } | |
1778 | ||
9903cd1c CL |
1779 | /** |
1780 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 1781 | * @args: rpc transport creation arguments |
9903cd1c CL |
1782 | * |
1783 | */ | |
96802a09 | 1784 | struct rpc_xprt *xs_setup_udp(struct rpc_xprtsock_create *args) |
a246b010 | 1785 | { |
8f9d5b1a | 1786 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 1787 | struct rpc_xprt *xprt; |
c8475461 | 1788 | struct sock_xprt *transport; |
a246b010 | 1789 | |
96802a09 | 1790 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
1791 | if (IS_ERR(xprt)) |
1792 | return xprt; | |
c8475461 | 1793 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1794 | |
ec739ef0 | 1795 | xprt->prot = IPPROTO_UDP; |
808012fb | 1796 | xprt->tsh_size = 0; |
a246b010 CL |
1797 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
1798 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
1799 | ||
03bf4b70 CL |
1800 | xprt->bind_timeout = XS_BIND_TO; |
1801 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
1802 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
1803 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1804 | |
262965f5 | 1805 | xprt->ops = &xs_udp_ops; |
a246b010 | 1806 | |
96802a09 FM |
1807 | if (args->timeout) |
1808 | xprt->timeout = *args->timeout; | |
a246b010 | 1809 | else |
9903cd1c | 1810 | xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); |
a246b010 | 1811 | |
8f9d5b1a CL |
1812 | switch (addr->sa_family) { |
1813 | case AF_INET: | |
1814 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
1815 | xprt_set_bound(xprt); | |
1816 | ||
1817 | INIT_DELAYED_WORK(&transport->connect_worker, | |
1818 | xs_udp_connect_worker4); | |
1819 | xs_format_ipv4_peer_addresses(xprt); | |
1820 | break; | |
1821 | case AF_INET6: | |
1822 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
1823 | xprt_set_bound(xprt); | |
1824 | ||
1825 | INIT_DELAYED_WORK(&transport->connect_worker, | |
1826 | xs_udp_connect_worker6); | |
1827 | xs_format_ipv6_peer_addresses(xprt); | |
1828 | break; | |
1829 | default: | |
1830 | kfree(xprt); | |
1831 | return ERR_PTR(-EAFNOSUPPORT); | |
1832 | } | |
1833 | ||
46121cf7 | 1834 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 1835 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1836 | |
c8541ecd | 1837 | return xprt; |
a246b010 CL |
1838 | } |
1839 | ||
9903cd1c CL |
1840 | /** |
1841 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 1842 | * @args: rpc transport creation arguments |
9903cd1c CL |
1843 | * |
1844 | */ | |
96802a09 | 1845 | struct rpc_xprt *xs_setup_tcp(struct rpc_xprtsock_create *args) |
a246b010 | 1846 | { |
8f9d5b1a | 1847 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 1848 | struct rpc_xprt *xprt; |
c8475461 | 1849 | struct sock_xprt *transport; |
a246b010 | 1850 | |
96802a09 | 1851 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
1852 | if (IS_ERR(xprt)) |
1853 | return xprt; | |
c8475461 | 1854 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1855 | |
ec739ef0 | 1856 | xprt->prot = IPPROTO_TCP; |
808012fb | 1857 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 1858 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 1859 | |
03bf4b70 CL |
1860 | xprt->bind_timeout = XS_BIND_TO; |
1861 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
1862 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
1863 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1864 | |
262965f5 | 1865 | xprt->ops = &xs_tcp_ops; |
a246b010 | 1866 | |
96802a09 FM |
1867 | if (args->timeout) |
1868 | xprt->timeout = *args->timeout; | |
a246b010 | 1869 | else |
9903cd1c | 1870 | xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); |
a246b010 | 1871 | |
8f9d5b1a CL |
1872 | switch (addr->sa_family) { |
1873 | case AF_INET: | |
1874 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
1875 | xprt_set_bound(xprt); | |
1876 | ||
1877 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); | |
1878 | xs_format_ipv4_peer_addresses(xprt); | |
1879 | break; | |
1880 | case AF_INET6: | |
1881 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
1882 | xprt_set_bound(xprt); | |
1883 | ||
1884 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); | |
1885 | xs_format_ipv6_peer_addresses(xprt); | |
1886 | break; | |
1887 | default: | |
1888 | kfree(xprt); | |
1889 | return ERR_PTR(-EAFNOSUPPORT); | |
1890 | } | |
1891 | ||
46121cf7 | 1892 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 1893 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1894 | |
c8541ecd | 1895 | return xprt; |
a246b010 | 1896 | } |
282b32e1 CL |
1897 | |
1898 | /** | |
fbf76683 | 1899 | * init_socket_xprt - set up xprtsock's sysctls |
282b32e1 CL |
1900 | * |
1901 | */ | |
1902 | int init_socket_xprt(void) | |
1903 | { | |
fbf76683 | 1904 | #ifdef RPC_DEBUG |
2b1bec5f | 1905 | if (!sunrpc_table_header) |
0b4d4147 | 1906 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
1907 | #endif |
1908 | ||
282b32e1 CL |
1909 | return 0; |
1910 | } | |
1911 | ||
1912 | /** | |
fbf76683 | 1913 | * cleanup_socket_xprt - remove xprtsock's sysctls |
282b32e1 CL |
1914 | * |
1915 | */ | |
1916 | void cleanup_socket_xprt(void) | |
1917 | { | |
fbf76683 CL |
1918 | #ifdef RPC_DEBUG |
1919 | if (sunrpc_table_header) { | |
1920 | unregister_sysctl_table(sunrpc_table_header); | |
1921 | sunrpc_table_header = NULL; | |
1922 | } | |
1923 | #endif | |
282b32e1 | 1924 | } |