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> | |
a246b010 CL |
16 | */ |
17 | ||
18 | #include <linux/types.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/capability.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/udp.h> | |
29 | #include <linux/tcp.h> | |
30 | #include <linux/sunrpc/clnt.h> | |
02107148 | 31 | #include <linux/sunrpc/sched.h> |
a246b010 CL |
32 | #include <linux/file.h> |
33 | ||
34 | #include <net/sock.h> | |
35 | #include <net/checksum.h> | |
36 | #include <net/udp.h> | |
37 | #include <net/tcp.h> | |
38 | ||
c556b754 CL |
39 | /* |
40 | * xprtsock tunables | |
41 | */ | |
42 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
43 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
44 | ||
45 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
46 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
47 | ||
262965f5 CL |
48 | /* |
49 | * How many times to try sending a request on a socket before waiting | |
50 | * for the socket buffer to clear. | |
51 | */ | |
52 | #define XS_SENDMSG_RETRY (10U) | |
53 | ||
03bf4b70 CL |
54 | /* |
55 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
56 | * synchronous, but we set a timeout anyway in case of resource | |
57 | * exhaustion on the local host. | |
58 | */ | |
59 | #define XS_UDP_CONN_TO (5U * HZ) | |
60 | ||
61 | /* | |
62 | * Wait duration for an RPC TCP connection to be established. Solaris | |
63 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
64 | * long a server takes to reboot. | |
65 | */ | |
66 | #define XS_TCP_CONN_TO (60U * HZ) | |
67 | ||
68 | /* | |
69 | * Wait duration for a reply from the RPC portmapper. | |
70 | */ | |
71 | #define XS_BIND_TO (60U * HZ) | |
72 | ||
73 | /* | |
74 | * Delay if a UDP socket connect error occurs. This is most likely some | |
75 | * kind of resource problem on the local host. | |
76 | */ | |
77 | #define XS_UDP_REEST_TO (2U * HZ) | |
78 | ||
79 | /* | |
80 | * The reestablish timeout allows clients to delay for a bit before attempting | |
81 | * to reconnect to a server that just dropped our connection. | |
82 | * | |
83 | * We implement an exponential backoff when trying to reestablish a TCP | |
84 | * transport connection with the server. Some servers like to drop a TCP | |
85 | * connection when they are overworked, so we start with a short timeout and | |
86 | * increase over time if the server is down or not responding. | |
87 | */ | |
88 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
89 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
90 | ||
91 | /* | |
92 | * TCP idle timeout; client drops the transport socket if it is idle | |
93 | * for this long. Note that we also timeout UDP sockets to prevent | |
94 | * holding port numbers when there is no RPC traffic. | |
95 | */ | |
96 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
97 | ||
a246b010 CL |
98 | #ifdef RPC_DEBUG |
99 | # undef RPC_DEBUG_DATA | |
9903cd1c | 100 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
101 | #endif |
102 | ||
a246b010 | 103 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 104 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 105 | { |
9903cd1c CL |
106 | u8 *buf = (u8 *) packet; |
107 | int j; | |
a246b010 CL |
108 | |
109 | dprintk("RPC: %s\n", msg); | |
110 | for (j = 0; j < count && j < 128; j += 4) { | |
111 | if (!(j & 31)) { | |
112 | if (j) | |
113 | dprintk("\n"); | |
114 | dprintk("0x%04x ", j); | |
115 | } | |
116 | dprintk("%02x%02x%02x%02x ", | |
117 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
118 | } | |
119 | dprintk("\n"); | |
120 | } | |
121 | #else | |
9903cd1c | 122 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
123 | { |
124 | /* NOP */ | |
125 | } | |
126 | #endif | |
127 | ||
edb267a6 CL |
128 | static void xs_format_peer_addresses(struct rpc_xprt *xprt) |
129 | { | |
130 | struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr; | |
131 | char *buf; | |
132 | ||
133 | buf = kzalloc(20, GFP_KERNEL); | |
134 | if (buf) { | |
135 | snprintf(buf, 20, "%u.%u.%u.%u", | |
136 | NIPQUAD(addr->sin_addr.s_addr)); | |
137 | } | |
138 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
139 | ||
140 | buf = kzalloc(8, GFP_KERNEL); | |
141 | if (buf) { | |
142 | snprintf(buf, 8, "%u", | |
143 | ntohs(addr->sin_port)); | |
144 | } | |
145 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
146 | ||
147 | if (xprt->prot == IPPROTO_UDP) | |
148 | xprt->address_strings[RPC_DISPLAY_PROTO] = "udp"; | |
149 | else | |
150 | xprt->address_strings[RPC_DISPLAY_PROTO] = "tcp"; | |
151 | ||
152 | buf = kzalloc(48, GFP_KERNEL); | |
153 | if (buf) { | |
154 | snprintf(buf, 48, "addr=%u.%u.%u.%u port=%u proto=%s", | |
155 | NIPQUAD(addr->sin_addr.s_addr), | |
156 | ntohs(addr->sin_port), | |
157 | xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
158 | } | |
159 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
160 | } | |
161 | ||
162 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
163 | { | |
164 | kfree(xprt->address_strings[RPC_DISPLAY_ADDR]); | |
165 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
166 | kfree(xprt->address_strings[RPC_DISPLAY_ALL]); | |
167 | } | |
168 | ||
b4b5cc85 CL |
169 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
170 | ||
24c5684b | 171 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 172 | { |
b4b5cc85 CL |
173 | struct msghdr msg = { |
174 | .msg_name = addr, | |
175 | .msg_namelen = addrlen, | |
24c5684b TM |
176 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
177 | }; | |
178 | struct kvec iov = { | |
179 | .iov_base = vec->iov_base + base, | |
180 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
181 | }; |
182 | ||
24c5684b | 183 | if (iov.iov_len != 0) |
b4b5cc85 CL |
184 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
185 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
186 | } | |
187 | ||
24c5684b | 188 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 189 | { |
24c5684b TM |
190 | struct page **ppage; |
191 | unsigned int remainder; | |
192 | int err, sent = 0; | |
193 | ||
194 | remainder = xdr->page_len - base; | |
195 | base += xdr->page_base; | |
196 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
197 | base &= ~PAGE_MASK; | |
198 | for(;;) { | |
199 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
200 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 201 | |
24c5684b TM |
202 | remainder -= len; |
203 | if (remainder != 0 || more) | |
204 | flags |= MSG_MORE; | |
205 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
206 | if (remainder == 0 || err != len) | |
207 | break; | |
208 | sent += err; | |
209 | ppage++; | |
210 | base = 0; | |
211 | } | |
212 | if (sent == 0) | |
213 | return err; | |
214 | if (err > 0) | |
215 | sent += err; | |
216 | return sent; | |
b4b5cc85 CL |
217 | } |
218 | ||
9903cd1c CL |
219 | /** |
220 | * xs_sendpages - write pages directly to a socket | |
221 | * @sock: socket to send on | |
222 | * @addr: UDP only -- address of destination | |
223 | * @addrlen: UDP only -- length of destination address | |
224 | * @xdr: buffer containing this request | |
225 | * @base: starting position in the buffer | |
226 | * | |
a246b010 | 227 | */ |
24c5684b | 228 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 229 | { |
24c5684b TM |
230 | unsigned int remainder = xdr->len - base; |
231 | int err, sent = 0; | |
a246b010 | 232 | |
262965f5 CL |
233 | if (unlikely(!sock)) |
234 | return -ENOTCONN; | |
235 | ||
236 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
237 | if (base != 0) { |
238 | addr = NULL; | |
239 | addrlen = 0; | |
240 | } | |
262965f5 | 241 | |
24c5684b TM |
242 | if (base < xdr->head[0].iov_len || addr != NULL) { |
243 | unsigned int len = xdr->head[0].iov_len - base; | |
244 | remainder -= len; | |
245 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
246 | if (remainder == 0 || err != len) | |
a246b010 | 247 | goto out; |
24c5684b | 248 | sent += err; |
a246b010 CL |
249 | base = 0; |
250 | } else | |
24c5684b | 251 | base -= xdr->head[0].iov_len; |
a246b010 | 252 | |
24c5684b TM |
253 | if (base < xdr->page_len) { |
254 | unsigned int len = xdr->page_len - base; | |
255 | remainder -= len; | |
256 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
257 | if (remainder == 0 || err != len) | |
a246b010 | 258 | goto out; |
24c5684b | 259 | sent += err; |
a246b010 | 260 | base = 0; |
24c5684b TM |
261 | } else |
262 | base -= xdr->page_len; | |
263 | ||
264 | if (base >= xdr->tail[0].iov_len) | |
265 | return sent; | |
266 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 267 | out: |
24c5684b TM |
268 | if (sent == 0) |
269 | return err; | |
270 | if (err > 0) | |
271 | sent += err; | |
272 | return sent; | |
a246b010 CL |
273 | } |
274 | ||
9903cd1c | 275 | /** |
262965f5 CL |
276 | * xs_nospace - place task on wait queue if transmit was incomplete |
277 | * @task: task to put to sleep | |
9903cd1c | 278 | * |
a246b010 | 279 | */ |
262965f5 | 280 | static void xs_nospace(struct rpc_task *task) |
a246b010 | 281 | { |
262965f5 CL |
282 | struct rpc_rqst *req = task->tk_rqstp; |
283 | struct rpc_xprt *xprt = req->rq_xprt; | |
a246b010 | 284 | |
262965f5 CL |
285 | dprintk("RPC: %4d xmit incomplete (%u left of %u)\n", |
286 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, | |
287 | req->rq_slen); | |
288 | ||
289 | if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) { | |
290 | /* Protect against races with write_space */ | |
291 | spin_lock_bh(&xprt->transport_lock); | |
292 | ||
293 | /* Don't race with disconnect */ | |
294 | if (!xprt_connected(xprt)) | |
295 | task->tk_status = -ENOTCONN; | |
296 | else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags)) | |
297 | xprt_wait_for_buffer_space(task); | |
298 | ||
299 | spin_unlock_bh(&xprt->transport_lock); | |
300 | } else | |
301 | /* Keep holding the socket if it is blocked */ | |
302 | rpc_delay(task, HZ>>4); | |
303 | } | |
304 | ||
305 | /** | |
306 | * xs_udp_send_request - write an RPC request to a UDP socket | |
307 | * @task: address of RPC task that manages the state of an RPC request | |
308 | * | |
309 | * Return values: | |
310 | * 0: The request has been sent | |
311 | * EAGAIN: The socket was blocked, please call again later to | |
312 | * complete the request | |
313 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
314 | * other: Some other error occured, the request was not sent | |
315 | */ | |
316 | static int xs_udp_send_request(struct rpc_task *task) | |
317 | { | |
318 | struct rpc_rqst *req = task->tk_rqstp; | |
319 | struct rpc_xprt *xprt = req->rq_xprt; | |
320 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
321 | int status; | |
a246b010 | 322 | |
9903cd1c | 323 | xs_pktdump("packet data:", |
a246b010 CL |
324 | req->rq_svec->iov_base, |
325 | req->rq_svec->iov_len); | |
326 | ||
262965f5 CL |
327 | req->rq_xtime = jiffies; |
328 | status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr, | |
c4efcb1d | 329 | xprt->addrlen, xdr, req->rq_bytes_sent); |
a246b010 | 330 | |
262965f5 CL |
331 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
332 | xdr->len - req->rq_bytes_sent, status); | |
a246b010 | 333 | |
262965f5 CL |
334 | if (likely(status >= (int) req->rq_slen)) |
335 | return 0; | |
a246b010 | 336 | |
262965f5 CL |
337 | /* Still some bytes left; set up for a retry later. */ |
338 | if (status > 0) | |
339 | status = -EAGAIN; | |
a246b010 | 340 | |
262965f5 CL |
341 | switch (status) { |
342 | case -ENETUNREACH: | |
343 | case -EPIPE: | |
a246b010 CL |
344 | case -ECONNREFUSED: |
345 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 346 | * prompts ECONNREFUSED. */ |
a246b010 | 347 | break; |
262965f5 CL |
348 | case -EAGAIN: |
349 | xs_nospace(task); | |
a246b010 CL |
350 | break; |
351 | default: | |
262965f5 CL |
352 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
353 | -status); | |
9903cd1c | 354 | break; |
a246b010 | 355 | } |
262965f5 CL |
356 | |
357 | return status; | |
a246b010 CL |
358 | } |
359 | ||
808012fb CL |
360 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
361 | { | |
362 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
363 | rpc_fraghdr *base = buf->head[0].iov_base; | |
364 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
365 | } | |
366 | ||
9903cd1c | 367 | /** |
262965f5 | 368 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
369 | * @task: address of RPC task that manages the state of an RPC request |
370 | * | |
371 | * Return values: | |
262965f5 CL |
372 | * 0: The request has been sent |
373 | * EAGAIN: The socket was blocked, please call again later to | |
374 | * complete the request | |
375 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
376 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
377 | * |
378 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 379 | * if sendmsg is not able to make progress? |
9903cd1c | 380 | */ |
262965f5 | 381 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
382 | { |
383 | struct rpc_rqst *req = task->tk_rqstp; | |
384 | struct rpc_xprt *xprt = req->rq_xprt; | |
262965f5 | 385 | struct xdr_buf *xdr = &req->rq_snd_buf; |
a246b010 CL |
386 | int status, retry = 0; |
387 | ||
808012fb | 388 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 389 | |
262965f5 CL |
390 | xs_pktdump("packet data:", |
391 | req->rq_svec->iov_base, | |
392 | req->rq_svec->iov_len); | |
a246b010 CL |
393 | |
394 | /* Continue transmitting the packet/record. We must be careful | |
395 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 396 | * called sendmsg(). */ |
a246b010 CL |
397 | while (1) { |
398 | req->rq_xtime = jiffies; | |
262965f5 CL |
399 | status = xs_sendpages(xprt->sock, NULL, 0, xdr, |
400 | req->rq_bytes_sent); | |
a246b010 | 401 | |
262965f5 CL |
402 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
403 | xdr->len - req->rq_bytes_sent, status); | |
a246b010 | 404 | |
262965f5 | 405 | if (unlikely(status < 0)) |
a246b010 | 406 | break; |
a246b010 | 407 | |
262965f5 CL |
408 | /* If we've sent the entire packet, immediately |
409 | * reset the count of bytes sent. */ | |
410 | req->rq_bytes_sent += status; | |
ef759a2e | 411 | task->tk_bytes_sent += status; |
262965f5 CL |
412 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
413 | req->rq_bytes_sent = 0; | |
414 | return 0; | |
415 | } | |
a246b010 CL |
416 | |
417 | status = -EAGAIN; | |
262965f5 | 418 | if (retry++ > XS_SENDMSG_RETRY) |
a246b010 CL |
419 | break; |
420 | } | |
421 | ||
262965f5 CL |
422 | switch (status) { |
423 | case -EAGAIN: | |
424 | xs_nospace(task); | |
425 | break; | |
426 | case -ECONNREFUSED: | |
427 | case -ECONNRESET: | |
428 | case -ENOTCONN: | |
429 | case -EPIPE: | |
430 | status = -ENOTCONN; | |
431 | break; | |
432 | default: | |
433 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
434 | -status); | |
43118c29 | 435 | xprt_disconnect(xprt); |
262965f5 | 436 | break; |
a246b010 | 437 | } |
262965f5 | 438 | |
a246b010 CL |
439 | return status; |
440 | } | |
441 | ||
e0ab53de TM |
442 | /** |
443 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
444 | * @xprt: transport | |
445 | * @task: rpc task | |
446 | * | |
447 | * This cleans up if an error causes us to abort the transmission of a request. | |
448 | * In this case, the socket may need to be reset in order to avoid confusing | |
449 | * the server. | |
450 | */ | |
451 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
452 | { | |
453 | struct rpc_rqst *req; | |
454 | ||
455 | if (task != xprt->snd_task) | |
456 | return; | |
457 | if (task == NULL) | |
458 | goto out_release; | |
459 | req = task->tk_rqstp; | |
460 | if (req->rq_bytes_sent == 0) | |
461 | goto out_release; | |
462 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
463 | goto out_release; | |
464 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
465 | out_release: | |
466 | xprt_release_xprt(xprt, task); | |
467 | } | |
468 | ||
9903cd1c CL |
469 | /** |
470 | * xs_close - close a socket | |
471 | * @xprt: transport | |
472 | * | |
3167e12c CL |
473 | * This is used when all requests are complete; ie, no DRC state remains |
474 | * on the server we want to save. | |
a246b010 | 475 | */ |
9903cd1c | 476 | static void xs_close(struct rpc_xprt *xprt) |
a246b010 | 477 | { |
9903cd1c CL |
478 | struct socket *sock = xprt->sock; |
479 | struct sock *sk = xprt->inet; | |
a246b010 CL |
480 | |
481 | if (!sk) | |
632e3bdc | 482 | goto clear_close_wait; |
a246b010 | 483 | |
9903cd1c CL |
484 | dprintk("RPC: xs_close xprt %p\n", xprt); |
485 | ||
a246b010 CL |
486 | write_lock_bh(&sk->sk_callback_lock); |
487 | xprt->inet = NULL; | |
488 | xprt->sock = NULL; | |
489 | ||
9903cd1c CL |
490 | sk->sk_user_data = NULL; |
491 | sk->sk_data_ready = xprt->old_data_ready; | |
a246b010 | 492 | sk->sk_state_change = xprt->old_state_change; |
9903cd1c | 493 | sk->sk_write_space = xprt->old_write_space; |
a246b010 CL |
494 | write_unlock_bh(&sk->sk_callback_lock); |
495 | ||
9903cd1c | 496 | sk->sk_no_check = 0; |
a246b010 CL |
497 | |
498 | sock_release(sock); | |
632e3bdc TM |
499 | clear_close_wait: |
500 | smp_mb__before_clear_bit(); | |
501 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
502 | smp_mb__after_clear_bit(); | |
a246b010 CL |
503 | } |
504 | ||
9903cd1c CL |
505 | /** |
506 | * xs_destroy - prepare to shutdown a transport | |
507 | * @xprt: doomed transport | |
508 | * | |
509 | */ | |
510 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 511 | { |
9903cd1c CL |
512 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
513 | ||
55aa4f58 | 514 | cancel_delayed_work(&xprt->connect_worker); |
a246b010 CL |
515 | flush_scheduled_work(); |
516 | ||
517 | xprt_disconnect(xprt); | |
9903cd1c | 518 | xs_close(xprt); |
edb267a6 | 519 | xs_free_peer_addresses(xprt); |
a246b010 CL |
520 | kfree(xprt->slot); |
521 | } | |
522 | ||
9903cd1c CL |
523 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
524 | { | |
525 | return (struct rpc_xprt *) sk->sk_user_data; | |
526 | } | |
527 | ||
528 | /** | |
529 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
530 | * @sk: socket with data to read | |
531 | * @len: how much data to read | |
532 | * | |
a246b010 | 533 | */ |
9903cd1c | 534 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 535 | { |
9903cd1c CL |
536 | struct rpc_task *task; |
537 | struct rpc_xprt *xprt; | |
a246b010 | 538 | struct rpc_rqst *rovr; |
9903cd1c | 539 | struct sk_buff *skb; |
a246b010 | 540 | int err, repsize, copied; |
d8ed029d AD |
541 | u32 _xid; |
542 | __be32 *xp; | |
a246b010 CL |
543 | |
544 | read_lock(&sk->sk_callback_lock); | |
9903cd1c CL |
545 | dprintk("RPC: xs_udp_data_ready...\n"); |
546 | if (!(xprt = xprt_from_sock(sk))) | |
a246b010 | 547 | goto out; |
a246b010 CL |
548 | |
549 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
550 | goto out; | |
551 | ||
552 | if (xprt->shutdown) | |
553 | goto dropit; | |
554 | ||
555 | repsize = skb->len - sizeof(struct udphdr); | |
556 | if (repsize < 4) { | |
9903cd1c | 557 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
558 | goto dropit; |
559 | } | |
560 | ||
561 | /* Copy the XID from the skb... */ | |
562 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
563 | sizeof(_xid), &_xid); | |
564 | if (xp == NULL) | |
565 | goto dropit; | |
566 | ||
567 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 568 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
569 | rovr = xprt_lookup_rqst(xprt, *xp); |
570 | if (!rovr) | |
571 | goto out_unlock; | |
572 | task = rovr->rq_task; | |
573 | ||
a246b010 CL |
574 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
575 | copied = repsize; | |
576 | ||
577 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
578 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) | |
579 | goto out_unlock; | |
580 | ||
581 | /* Something worked... */ | |
582 | dst_confirm(skb->dst); | |
583 | ||
1570c1e4 CL |
584 | xprt_adjust_cwnd(task, copied); |
585 | xprt_update_rtt(task); | |
586 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
587 | |
588 | out_unlock: | |
4a0f8c04 | 589 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
590 | dropit: |
591 | skb_free_datagram(sk, skb); | |
592 | out: | |
593 | read_unlock(&sk->sk_callback_lock); | |
594 | } | |
595 | ||
9903cd1c | 596 | static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len) |
a246b010 CL |
597 | { |
598 | if (len > desc->count) | |
599 | len = desc->count; | |
600 | if (skb_copy_bits(desc->skb, desc->offset, p, len)) { | |
601 | dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n", | |
602 | len, desc->count); | |
603 | return 0; | |
604 | } | |
605 | desc->offset += len; | |
606 | desc->count -= len; | |
607 | dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n", | |
608 | len, desc->count); | |
609 | return len; | |
610 | } | |
611 | ||
9903cd1c | 612 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc) |
a246b010 CL |
613 | { |
614 | size_t len, used; | |
615 | char *p; | |
616 | ||
617 | p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset; | |
618 | len = sizeof(xprt->tcp_recm) - xprt->tcp_offset; | |
9903cd1c | 619 | used = xs_tcp_copy_data(desc, p, len); |
a246b010 CL |
620 | xprt->tcp_offset += used; |
621 | if (used != len) | |
622 | return; | |
808012fb | 623 | |
a246b010 | 624 | xprt->tcp_reclen = ntohl(xprt->tcp_recm); |
808012fb | 625 | if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) |
a246b010 CL |
626 | xprt->tcp_flags |= XPRT_LAST_FRAG; |
627 | else | |
628 | xprt->tcp_flags &= ~XPRT_LAST_FRAG; | |
808012fb CL |
629 | xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
630 | ||
a246b010 CL |
631 | xprt->tcp_flags &= ~XPRT_COPY_RECM; |
632 | xprt->tcp_offset = 0; | |
808012fb | 633 | |
a246b010 | 634 | /* Sanity check of the record length */ |
808012fb | 635 | if (unlikely(xprt->tcp_reclen < 4)) { |
9903cd1c | 636 | dprintk("RPC: invalid TCP record fragment length\n"); |
a246b010 | 637 | xprt_disconnect(xprt); |
9903cd1c | 638 | return; |
a246b010 CL |
639 | } |
640 | dprintk("RPC: reading TCP record fragment of length %d\n", | |
641 | xprt->tcp_reclen); | |
642 | } | |
643 | ||
9903cd1c | 644 | static void xs_tcp_check_recm(struct rpc_xprt *xprt) |
a246b010 CL |
645 | { |
646 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n", | |
647 | xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags); | |
648 | if (xprt->tcp_offset == xprt->tcp_reclen) { | |
649 | xprt->tcp_flags |= XPRT_COPY_RECM; | |
650 | xprt->tcp_offset = 0; | |
651 | if (xprt->tcp_flags & XPRT_LAST_FRAG) { | |
652 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
653 | xprt->tcp_flags |= XPRT_COPY_XID; | |
654 | xprt->tcp_copied = 0; | |
655 | } | |
656 | } | |
657 | } | |
658 | ||
9903cd1c | 659 | static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc) |
a246b010 CL |
660 | { |
661 | size_t len, used; | |
662 | char *p; | |
663 | ||
664 | len = sizeof(xprt->tcp_xid) - xprt->tcp_offset; | |
665 | dprintk("RPC: reading XID (%Zu bytes)\n", len); | |
666 | p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset; | |
9903cd1c | 667 | used = xs_tcp_copy_data(desc, p, len); |
a246b010 CL |
668 | xprt->tcp_offset += used; |
669 | if (used != len) | |
670 | return; | |
671 | xprt->tcp_flags &= ~XPRT_COPY_XID; | |
672 | xprt->tcp_flags |= XPRT_COPY_DATA; | |
673 | xprt->tcp_copied = 4; | |
674 | dprintk("RPC: reading reply for XID %08x\n", | |
675 | ntohl(xprt->tcp_xid)); | |
9903cd1c | 676 | xs_tcp_check_recm(xprt); |
a246b010 CL |
677 | } |
678 | ||
9903cd1c | 679 | static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc) |
a246b010 CL |
680 | { |
681 | struct rpc_rqst *req; | |
682 | struct xdr_buf *rcvbuf; | |
683 | size_t len; | |
684 | ssize_t r; | |
685 | ||
686 | /* Find and lock the request corresponding to this xid */ | |
4a0f8c04 | 687 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
688 | req = xprt_lookup_rqst(xprt, xprt->tcp_xid); |
689 | if (!req) { | |
690 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
691 | dprintk("RPC: XID %08x request not found!\n", | |
692 | ntohl(xprt->tcp_xid)); | |
4a0f8c04 | 693 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
694 | return; |
695 | } | |
696 | ||
697 | rcvbuf = &req->rq_private_buf; | |
698 | len = desc->count; | |
699 | if (len > xprt->tcp_reclen - xprt->tcp_offset) { | |
700 | skb_reader_t my_desc; | |
701 | ||
702 | len = xprt->tcp_reclen - xprt->tcp_offset; | |
703 | memcpy(&my_desc, desc, sizeof(my_desc)); | |
704 | my_desc.count = len; | |
705 | r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, | |
9903cd1c | 706 | &my_desc, xs_tcp_copy_data); |
a246b010 CL |
707 | desc->count -= r; |
708 | desc->offset += r; | |
709 | } else | |
710 | r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, | |
9903cd1c | 711 | desc, xs_tcp_copy_data); |
a246b010 CL |
712 | |
713 | if (r > 0) { | |
714 | xprt->tcp_copied += r; | |
715 | xprt->tcp_offset += r; | |
716 | } | |
717 | if (r != len) { | |
718 | /* Error when copying to the receive buffer, | |
719 | * usually because we weren't able to allocate | |
720 | * additional buffer pages. All we can do now | |
721 | * is turn off XPRT_COPY_DATA, so the request | |
722 | * will not receive any additional updates, | |
723 | * and time out. | |
724 | * Any remaining data from this record will | |
725 | * be discarded. | |
726 | */ | |
727 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
728 | dprintk("RPC: XID %08x truncated request\n", | |
729 | ntohl(xprt->tcp_xid)); | |
730 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", | |
731 | xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); | |
732 | goto out; | |
733 | } | |
734 | ||
735 | dprintk("RPC: XID %08x read %Zd bytes\n", | |
736 | ntohl(xprt->tcp_xid), r); | |
737 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", | |
738 | xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); | |
739 | ||
740 | if (xprt->tcp_copied == req->rq_private_buf.buflen) | |
741 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
742 | else if (xprt->tcp_offset == xprt->tcp_reclen) { | |
743 | if (xprt->tcp_flags & XPRT_LAST_FRAG) | |
744 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
745 | } | |
746 | ||
747 | out: | |
1570c1e4 CL |
748 | if (!(xprt->tcp_flags & XPRT_COPY_DATA)) |
749 | xprt_complete_rqst(req->rq_task, xprt->tcp_copied); | |
4a0f8c04 | 750 | spin_unlock(&xprt->transport_lock); |
9903cd1c | 751 | xs_tcp_check_recm(xprt); |
a246b010 CL |
752 | } |
753 | ||
9903cd1c | 754 | static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc) |
a246b010 CL |
755 | { |
756 | size_t len; | |
757 | ||
758 | len = xprt->tcp_reclen - xprt->tcp_offset; | |
759 | if (len > desc->count) | |
760 | len = desc->count; | |
761 | desc->count -= len; | |
762 | desc->offset += len; | |
763 | xprt->tcp_offset += len; | |
764 | dprintk("RPC: discarded %Zu bytes\n", len); | |
9903cd1c | 765 | xs_tcp_check_recm(xprt); |
a246b010 CL |
766 | } |
767 | ||
9903cd1c | 768 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
769 | { |
770 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
771 | skb_reader_t desc = { | |
772 | .skb = skb, | |
773 | .offset = offset, | |
774 | .count = len, | |
775 | .csum = 0 | |
9903cd1c | 776 | }; |
a246b010 | 777 | |
9903cd1c | 778 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
779 | do { |
780 | /* Read in a new fragment marker if necessary */ | |
781 | /* Can we ever really expect to get completely empty fragments? */ | |
782 | if (xprt->tcp_flags & XPRT_COPY_RECM) { | |
9903cd1c | 783 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
784 | continue; |
785 | } | |
786 | /* Read in the xid if necessary */ | |
787 | if (xprt->tcp_flags & XPRT_COPY_XID) { | |
9903cd1c | 788 | xs_tcp_read_xid(xprt, &desc); |
a246b010 CL |
789 | continue; |
790 | } | |
791 | /* Read in the request data */ | |
792 | if (xprt->tcp_flags & XPRT_COPY_DATA) { | |
9903cd1c | 793 | xs_tcp_read_request(xprt, &desc); |
a246b010 CL |
794 | continue; |
795 | } | |
796 | /* Skip over any trailing bytes on short reads */ | |
9903cd1c | 797 | xs_tcp_read_discard(xprt, &desc); |
a246b010 | 798 | } while (desc.count); |
9903cd1c | 799 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
800 | return len - desc.count; |
801 | } | |
802 | ||
9903cd1c CL |
803 | /** |
804 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
805 | * @sk: socket with data to read | |
806 | * @bytes: how much data to read | |
807 | * | |
808 | */ | |
809 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
810 | { |
811 | struct rpc_xprt *xprt; | |
812 | read_descriptor_t rd_desc; | |
813 | ||
814 | read_lock(&sk->sk_callback_lock); | |
9903cd1c CL |
815 | dprintk("RPC: xs_tcp_data_ready...\n"); |
816 | if (!(xprt = xprt_from_sock(sk))) | |
a246b010 | 817 | goto out; |
a246b010 CL |
818 | if (xprt->shutdown) |
819 | goto out; | |
820 | ||
9903cd1c | 821 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 CL |
822 | rd_desc.arg.data = xprt; |
823 | rd_desc.count = 65536; | |
9903cd1c | 824 | tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
a246b010 CL |
825 | out: |
826 | read_unlock(&sk->sk_callback_lock); | |
827 | } | |
828 | ||
9903cd1c CL |
829 | /** |
830 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
831 | * @sk: socket whose state has changed | |
832 | * | |
833 | */ | |
834 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 835 | { |
9903cd1c | 836 | struct rpc_xprt *xprt; |
a246b010 CL |
837 | |
838 | read_lock(&sk->sk_callback_lock); | |
839 | if (!(xprt = xprt_from_sock(sk))) | |
840 | goto out; | |
9903cd1c | 841 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
a246b010 CL |
842 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", |
843 | sk->sk_state, xprt_connected(xprt), | |
844 | sock_flag(sk, SOCK_DEAD), | |
845 | sock_flag(sk, SOCK_ZAPPED)); | |
846 | ||
847 | switch (sk->sk_state) { | |
848 | case TCP_ESTABLISHED: | |
4a0f8c04 | 849 | spin_lock_bh(&xprt->transport_lock); |
a246b010 CL |
850 | if (!xprt_test_and_set_connected(xprt)) { |
851 | /* Reset TCP record info */ | |
852 | xprt->tcp_offset = 0; | |
853 | xprt->tcp_reclen = 0; | |
854 | xprt->tcp_copied = 0; | |
855 | xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID; | |
03bf4b70 | 856 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
44fbac22 | 857 | xprt_wake_pending_tasks(xprt, 0); |
a246b010 | 858 | } |
4a0f8c04 | 859 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 CL |
860 | break; |
861 | case TCP_SYN_SENT: | |
862 | case TCP_SYN_RECV: | |
863 | break; | |
632e3bdc TM |
864 | case TCP_CLOSE_WAIT: |
865 | /* Try to schedule an autoclose RPC calls */ | |
866 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
867 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
868 | schedule_work(&xprt->task_cleanup); | |
a246b010 CL |
869 | default: |
870 | xprt_disconnect(xprt); | |
a246b010 CL |
871 | } |
872 | out: | |
873 | read_unlock(&sk->sk_callback_lock); | |
874 | } | |
875 | ||
9903cd1c | 876 | /** |
c7b2cae8 CL |
877 | * xs_udp_write_space - callback invoked when socket buffer space |
878 | * becomes available | |
9903cd1c CL |
879 | * @sk: socket whose state has changed |
880 | * | |
a246b010 CL |
881 | * Called when more output buffer space is available for this socket. |
882 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 883 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
884 | * with a bunch of small requests. |
885 | */ | |
c7b2cae8 | 886 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 887 | { |
a246b010 | 888 | read_lock(&sk->sk_callback_lock); |
a246b010 | 889 | |
c7b2cae8 CL |
890 | /* from net/core/sock.c:sock_def_write_space */ |
891 | if (sock_writeable(sk)) { | |
892 | struct socket *sock; | |
893 | struct rpc_xprt *xprt; | |
894 | ||
895 | if (unlikely(!(sock = sk->sk_socket))) | |
a246b010 | 896 | goto out; |
c7b2cae8 CL |
897 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
898 | goto out; | |
899 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
a246b010 | 900 | goto out; |
c7b2cae8 CL |
901 | |
902 | xprt_write_space(xprt); | |
a246b010 CL |
903 | } |
904 | ||
c7b2cae8 CL |
905 | out: |
906 | read_unlock(&sk->sk_callback_lock); | |
907 | } | |
a246b010 | 908 | |
c7b2cae8 CL |
909 | /** |
910 | * xs_tcp_write_space - callback invoked when socket buffer space | |
911 | * becomes available | |
912 | * @sk: socket whose state has changed | |
913 | * | |
914 | * Called when more output buffer space is available for this socket. | |
915 | * We try not to wake our writers until they can make "significant" | |
916 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
917 | * with a bunch of small requests. | |
918 | */ | |
919 | static void xs_tcp_write_space(struct sock *sk) | |
920 | { | |
921 | read_lock(&sk->sk_callback_lock); | |
922 | ||
923 | /* from net/core/stream.c:sk_stream_write_space */ | |
924 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
925 | struct socket *sock; | |
926 | struct rpc_xprt *xprt; | |
927 | ||
928 | if (unlikely(!(sock = sk->sk_socket))) | |
929 | goto out; | |
930 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
931 | goto out; | |
932 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
933 | goto out; | |
934 | ||
935 | xprt_write_space(xprt); | |
936 | } | |
937 | ||
938 | out: | |
a246b010 CL |
939 | read_unlock(&sk->sk_callback_lock); |
940 | } | |
941 | ||
470056c2 | 942 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 CL |
943 | { |
944 | struct sock *sk = xprt->inet; | |
945 | ||
a246b010 CL |
946 | if (xprt->rcvsize) { |
947 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
948 | sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2; | |
949 | } | |
950 | if (xprt->sndsize) { | |
951 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
952 | sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2; | |
953 | sk->sk_write_space(sk); | |
954 | } | |
955 | } | |
956 | ||
43118c29 | 957 | /** |
470056c2 | 958 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 959 | * @xprt: generic transport |
470056c2 CL |
960 | * @sndsize: requested size of send buffer, in bytes |
961 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 962 | * |
470056c2 | 963 | * Set socket send and receive buffer size limits. |
43118c29 | 964 | */ |
470056c2 | 965 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 966 | { |
470056c2 CL |
967 | xprt->sndsize = 0; |
968 | if (sndsize) | |
969 | xprt->sndsize = sndsize + 1024; | |
970 | xprt->rcvsize = 0; | |
971 | if (rcvsize) | |
972 | xprt->rcvsize = rcvsize + 1024; | |
973 | ||
974 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
975 | } |
976 | ||
46c0ee8b CL |
977 | /** |
978 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
979 | * @task: task that timed out | |
980 | * | |
981 | * Adjust the congestion window after a retransmit timeout has occurred. | |
982 | */ | |
983 | static void xs_udp_timer(struct rpc_task *task) | |
984 | { | |
985 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
986 | } | |
987 | ||
b85d8806 CL |
988 | static unsigned short xs_get_random_port(void) |
989 | { | |
990 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
991 | unsigned short rand = (unsigned short) net_random() % range; | |
992 | return rand + xprt_min_resvport; | |
993 | } | |
994 | ||
edb267a6 CL |
995 | /** |
996 | * xs_print_peer_address - format an IPv4 address for printing | |
997 | * @xprt: generic transport | |
998 | * @format: flags field indicating which parts of the address to render | |
999 | */ | |
1000 | static char *xs_print_peer_address(struct rpc_xprt *xprt, enum rpc_display_format_t format) | |
1001 | { | |
1002 | if (xprt->address_strings[format] != NULL) | |
1003 | return xprt->address_strings[format]; | |
1004 | else | |
1005 | return "unprintable"; | |
1006 | } | |
1007 | ||
92200412 CL |
1008 | /** |
1009 | * xs_set_port - reset the port number in the remote endpoint address | |
1010 | * @xprt: generic transport | |
1011 | * @port: new port number | |
1012 | * | |
1013 | */ | |
1014 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1015 | { | |
c4efcb1d CL |
1016 | struct sockaddr_in *sap = (struct sockaddr_in *) &xprt->addr; |
1017 | ||
92200412 | 1018 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d CL |
1019 | |
1020 | sap->sin_port = htons(port); | |
92200412 CL |
1021 | } |
1022 | ||
9903cd1c | 1023 | static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 CL |
1024 | { |
1025 | struct sockaddr_in myaddr = { | |
1026 | .sin_family = AF_INET, | |
1027 | }; | |
529b33c6 CL |
1028 | int err; |
1029 | unsigned short port = xprt->port; | |
a246b010 | 1030 | |
a246b010 CL |
1031 | do { |
1032 | myaddr.sin_port = htons(port); | |
e6242e92 | 1033 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 CL |
1034 | sizeof(myaddr)); |
1035 | if (err == 0) { | |
1036 | xprt->port = port; | |
9903cd1c CL |
1037 | dprintk("RPC: xs_bindresvport bound to port %u\n", |
1038 | port); | |
a246b010 CL |
1039 | return 0; |
1040 | } | |
529b33c6 CL |
1041 | if (port <= xprt_min_resvport) |
1042 | port = xprt_max_resvport; | |
1043 | else | |
1044 | port--; | |
a246b010 CL |
1045 | } while (err == -EADDRINUSE && port != xprt->port); |
1046 | ||
9903cd1c | 1047 | dprintk("RPC: can't bind to reserved port (%d).\n", -err); |
a246b010 CL |
1048 | return err; |
1049 | } | |
1050 | ||
b0d93ad5 CL |
1051 | /** |
1052 | * xs_udp_connect_worker - set up a UDP socket | |
1053 | * @args: RPC transport to connect | |
1054 | * | |
1055 | * Invoked by a work queue tasklet. | |
1056 | */ | |
1057 | static void xs_udp_connect_worker(void *args) | |
a246b010 | 1058 | { |
b0d93ad5 CL |
1059 | struct rpc_xprt *xprt = (struct rpc_xprt *) args; |
1060 | struct socket *sock = xprt->sock; | |
1061 | int err, status = -EIO; | |
9903cd1c | 1062 | |
ec739ef0 | 1063 | if (xprt->shutdown || !xprt_bound(xprt)) |
b0d93ad5 | 1064 | goto out; |
9903cd1c | 1065 | |
b0d93ad5 CL |
1066 | /* Start by resetting any existing state */ |
1067 | xs_close(xprt); | |
9903cd1c | 1068 | |
b0d93ad5 CL |
1069 | if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { |
1070 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); | |
1071 | goto out; | |
1072 | } | |
9903cd1c | 1073 | |
b0d93ad5 CL |
1074 | if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { |
1075 | sock_release(sock); | |
1076 | goto out; | |
1077 | } | |
9903cd1c | 1078 | |
edb267a6 CL |
1079 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
1080 | xprt, xs_print_peer_address(xprt, RPC_DISPLAY_ALL)); | |
1081 | ||
b0d93ad5 CL |
1082 | if (!xprt->inet) { |
1083 | struct sock *sk = sock->sk; | |
a246b010 | 1084 | |
b0d93ad5 | 1085 | write_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1086 | |
b0d93ad5 CL |
1087 | sk->sk_user_data = xprt; |
1088 | xprt->old_data_ready = sk->sk_data_ready; | |
1089 | xprt->old_state_change = sk->sk_state_change; | |
1090 | xprt->old_write_space = sk->sk_write_space; | |
9903cd1c | 1091 | sk->sk_data_ready = xs_udp_data_ready; |
c7b2cae8 | 1092 | sk->sk_write_space = xs_udp_write_space; |
a246b010 | 1093 | sk->sk_no_check = UDP_CSUM_NORCV; |
b079fa7b | 1094 | sk->sk_allocation = GFP_ATOMIC; |
b0d93ad5 | 1095 | |
a246b010 | 1096 | xprt_set_connected(xprt); |
a246b010 | 1097 | |
b0d93ad5 CL |
1098 | /* Reset to new socket */ |
1099 | xprt->sock = sock; | |
1100 | xprt->inet = sk; | |
a246b010 | 1101 | |
b0d93ad5 CL |
1102 | write_unlock_bh(&sk->sk_callback_lock); |
1103 | } | |
470056c2 | 1104 | xs_udp_do_set_buffer_size(xprt); |
b0d93ad5 CL |
1105 | status = 0; |
1106 | out: | |
1107 | xprt_wake_pending_tasks(xprt, status); | |
1108 | xprt_clear_connecting(xprt); | |
a246b010 CL |
1109 | } |
1110 | ||
3167e12c CL |
1111 | /* |
1112 | * We need to preserve the port number so the reply cache on the server can | |
1113 | * find our cached RPC replies when we get around to reconnecting. | |
1114 | */ | |
1115 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) | |
1116 | { | |
1117 | int result; | |
1118 | struct socket *sock = xprt->sock; | |
1119 | struct sockaddr any; | |
1120 | ||
1121 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); | |
1122 | ||
1123 | /* | |
1124 | * Disconnect the transport socket by doing a connect operation | |
1125 | * with AF_UNSPEC. This should return immediately... | |
1126 | */ | |
1127 | memset(&any, 0, sizeof(any)); | |
1128 | any.sa_family = AF_UNSPEC; | |
e6242e92 | 1129 | result = kernel_connect(sock, &any, sizeof(any), 0); |
3167e12c CL |
1130 | if (result) |
1131 | dprintk("RPC: AF_UNSPEC connect return code %d\n", | |
1132 | result); | |
1133 | } | |
1134 | ||
9903cd1c | 1135 | /** |
b0d93ad5 | 1136 | * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint |
9903cd1c CL |
1137 | * @args: RPC transport to connect |
1138 | * | |
1139 | * Invoked by a work queue tasklet. | |
a246b010 | 1140 | */ |
b0d93ad5 | 1141 | static void xs_tcp_connect_worker(void *args) |
a246b010 CL |
1142 | { |
1143 | struct rpc_xprt *xprt = (struct rpc_xprt *)args; | |
1144 | struct socket *sock = xprt->sock; | |
b0d93ad5 | 1145 | int err, status = -EIO; |
a246b010 | 1146 | |
ec739ef0 | 1147 | if (xprt->shutdown || !xprt_bound(xprt)) |
a246b010 CL |
1148 | goto out; |
1149 | ||
3167e12c CL |
1150 | if (!xprt->sock) { |
1151 | /* start from scratch */ | |
1152 | if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { | |
1153 | dprintk("RPC: can't create TCP transport socket (%d).\n", -err); | |
1154 | goto out; | |
1155 | } | |
a246b010 | 1156 | |
3167e12c CL |
1157 | if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { |
1158 | sock_release(sock); | |
1159 | goto out; | |
1160 | } | |
1161 | } else | |
1162 | /* "close" the socket, preserving the local port */ | |
1163 | xs_tcp_reuse_connection(xprt); | |
a246b010 | 1164 | |
edb267a6 CL |
1165 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
1166 | xprt, xs_print_peer_address(xprt, RPC_DISPLAY_ALL)); | |
1167 | ||
b0d93ad5 CL |
1168 | if (!xprt->inet) { |
1169 | struct sock *sk = sock->sk; | |
1170 | ||
1171 | write_lock_bh(&sk->sk_callback_lock); | |
1172 | ||
1173 | sk->sk_user_data = xprt; | |
1174 | xprt->old_data_ready = sk->sk_data_ready; | |
1175 | xprt->old_state_change = sk->sk_state_change; | |
1176 | xprt->old_write_space = sk->sk_write_space; | |
1177 | sk->sk_data_ready = xs_tcp_data_ready; | |
1178 | sk->sk_state_change = xs_tcp_state_change; | |
1179 | sk->sk_write_space = xs_tcp_write_space; | |
b079fa7b | 1180 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1181 | |
1182 | /* socket options */ | |
1183 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1184 | sock_reset_flag(sk, SOCK_LINGER); | |
1185 | tcp_sk(sk)->linger2 = 0; | |
1186 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1187 | |
1188 | xprt_clear_connected(xprt); | |
1189 | ||
1190 | /* Reset to new socket */ | |
1191 | xprt->sock = sock; | |
1192 | xprt->inet = sk; | |
1193 | ||
1194 | write_unlock_bh(&sk->sk_callback_lock); | |
1195 | } | |
1196 | ||
1197 | /* Tell the socket layer to start connecting... */ | |
262ca07d CL |
1198 | xprt->stat.connect_count++; |
1199 | xprt->stat.connect_start = jiffies; | |
e6242e92 | 1200 | status = kernel_connect(sock, (struct sockaddr *) &xprt->addr, |
c4efcb1d | 1201 | xprt->addrlen, O_NONBLOCK); |
a246b010 CL |
1202 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1203 | xprt, -status, xprt_connected(xprt), sock->sk->sk_state); | |
1204 | if (status < 0) { | |
1205 | switch (status) { | |
1206 | case -EINPROGRESS: | |
1207 | case -EALREADY: | |
1208 | goto out_clear; | |
3167e12c CL |
1209 | case -ECONNREFUSED: |
1210 | case -ECONNRESET: | |
1211 | /* retry with existing socket, after a delay */ | |
1212 | break; | |
1213 | default: | |
1214 | /* get rid of existing socket, and retry */ | |
1215 | xs_close(xprt); | |
1216 | break; | |
a246b010 CL |
1217 | } |
1218 | } | |
1219 | out: | |
44fbac22 | 1220 | xprt_wake_pending_tasks(xprt, status); |
a246b010 | 1221 | out_clear: |
2226feb6 | 1222 | xprt_clear_connecting(xprt); |
a246b010 CL |
1223 | } |
1224 | ||
9903cd1c CL |
1225 | /** |
1226 | * xs_connect - connect a socket to a remote endpoint | |
1227 | * @task: address of RPC task that manages state of connect request | |
1228 | * | |
1229 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
1230 | * |
1231 | * UDP socket connects are synchronous, but we use a work queue anyway | |
1232 | * to guarantee that even unprivileged user processes can set up a | |
1233 | * socket on a privileged port. | |
1234 | * | |
1235 | * If a UDP socket connect fails, the delay behavior here prevents | |
1236 | * retry floods (hard mounts). | |
9903cd1c CL |
1237 | */ |
1238 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
1239 | { |
1240 | struct rpc_xprt *xprt = task->tk_xprt; | |
1241 | ||
b0d93ad5 CL |
1242 | if (xprt_test_and_set_connecting(xprt)) |
1243 | return; | |
1244 | ||
1245 | if (xprt->sock != NULL) { | |
03bf4b70 CL |
1246 | dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n", |
1247 | xprt, xprt->reestablish_timeout / HZ); | |
b0d93ad5 | 1248 | schedule_delayed_work(&xprt->connect_worker, |
03bf4b70 CL |
1249 | xprt->reestablish_timeout); |
1250 | xprt->reestablish_timeout <<= 1; | |
1251 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) | |
1252 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 CL |
1253 | } else { |
1254 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); | |
1255 | schedule_work(&xprt->connect_worker); | |
1256 | ||
1257 | /* flush_scheduled_work can sleep... */ | |
1258 | if (!RPC_IS_ASYNC(task)) | |
1259 | flush_scheduled_work(); | |
a246b010 CL |
1260 | } |
1261 | } | |
1262 | ||
262ca07d CL |
1263 | /** |
1264 | * xs_udp_print_stats - display UDP socket-specifc stats | |
1265 | * @xprt: rpc_xprt struct containing statistics | |
1266 | * @seq: output file | |
1267 | * | |
1268 | */ | |
1269 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1270 | { | |
1271 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", | |
1272 | xprt->port, | |
1273 | xprt->stat.bind_count, | |
1274 | xprt->stat.sends, | |
1275 | xprt->stat.recvs, | |
1276 | xprt->stat.bad_xids, | |
1277 | xprt->stat.req_u, | |
1278 | xprt->stat.bklog_u); | |
1279 | } | |
1280 | ||
1281 | /** | |
1282 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
1283 | * @xprt: rpc_xprt struct containing statistics | |
1284 | * @seq: output file | |
1285 | * | |
1286 | */ | |
1287 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1288 | { | |
1289 | long idle_time = 0; | |
1290 | ||
1291 | if (xprt_connected(xprt)) | |
1292 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
1293 | ||
1294 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
1295 | xprt->port, | |
1296 | xprt->stat.bind_count, | |
1297 | xprt->stat.connect_count, | |
1298 | xprt->stat.connect_time, | |
1299 | idle_time, | |
1300 | xprt->stat.sends, | |
1301 | xprt->stat.recvs, | |
1302 | xprt->stat.bad_xids, | |
1303 | xprt->stat.req_u, | |
1304 | xprt->stat.bklog_u); | |
1305 | } | |
1306 | ||
262965f5 | 1307 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 1308 | .set_buffer_size = xs_udp_set_buffer_size, |
edb267a6 | 1309 | .print_addr = xs_print_peer_address, |
12a80469 | 1310 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 1311 | .release_xprt = xprt_release_xprt_cong, |
bbf7c1dd | 1312 | .rpcbind = rpc_getport, |
92200412 | 1313 | .set_port = xs_set_port, |
262965f5 | 1314 | .connect = xs_connect, |
02107148 CL |
1315 | .buf_alloc = rpc_malloc, |
1316 | .buf_free = rpc_free, | |
262965f5 | 1317 | .send_request = xs_udp_send_request, |
fe3aca29 | 1318 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 1319 | .timer = xs_udp_timer, |
a58dd398 | 1320 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
1321 | .close = xs_close, |
1322 | .destroy = xs_destroy, | |
262ca07d | 1323 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
1324 | }; |
1325 | ||
1326 | static struct rpc_xprt_ops xs_tcp_ops = { | |
edb267a6 | 1327 | .print_addr = xs_print_peer_address, |
12a80469 | 1328 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 1329 | .release_xprt = xs_tcp_release_xprt, |
bbf7c1dd | 1330 | .rpcbind = rpc_getport, |
92200412 | 1331 | .set_port = xs_set_port, |
9903cd1c | 1332 | .connect = xs_connect, |
02107148 CL |
1333 | .buf_alloc = rpc_malloc, |
1334 | .buf_free = rpc_free, | |
262965f5 | 1335 | .send_request = xs_tcp_send_request, |
fe3aca29 | 1336 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
9903cd1c CL |
1337 | .close = xs_close, |
1338 | .destroy = xs_destroy, | |
262ca07d | 1339 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
1340 | }; |
1341 | ||
9903cd1c CL |
1342 | /** |
1343 | * xs_setup_udp - Set up transport to use a UDP socket | |
1344 | * @xprt: transport to set up | |
1345 | * @to: timeout parameters | |
1346 | * | |
1347 | */ | |
a246b010 CL |
1348 | int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to) |
1349 | { | |
1350 | size_t slot_table_size; | |
c4efcb1d | 1351 | struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr; |
a246b010 CL |
1352 | |
1353 | xprt->max_reqs = xprt_udp_slot_table_entries; | |
1354 | slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); | |
0da974f4 | 1355 | xprt->slot = kzalloc(slot_table_size, GFP_KERNEL); |
a246b010 CL |
1356 | if (xprt->slot == NULL) |
1357 | return -ENOMEM; | |
a246b010 | 1358 | |
b7766da7 | 1359 | if (ntohs(addr->sin_port) != 0) |
ec739ef0 | 1360 | xprt_set_bound(xprt); |
b85d8806 | 1361 | xprt->port = xs_get_random_port(); |
ec739ef0 CL |
1362 | |
1363 | xprt->prot = IPPROTO_UDP; | |
808012fb | 1364 | xprt->tsh_size = 0; |
a246b010 CL |
1365 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
1366 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
1367 | ||
b0d93ad5 | 1368 | INIT_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt); |
03bf4b70 CL |
1369 | xprt->bind_timeout = XS_BIND_TO; |
1370 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
1371 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
1372 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1373 | |
262965f5 | 1374 | xprt->ops = &xs_udp_ops; |
a246b010 CL |
1375 | |
1376 | if (to) | |
1377 | xprt->timeout = *to; | |
1378 | else | |
9903cd1c | 1379 | xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); |
a246b010 | 1380 | |
edb267a6 CL |
1381 | xs_format_peer_addresses(xprt); |
1382 | dprintk("RPC: set up transport to address %s\n", | |
1383 | xs_print_peer_address(xprt, RPC_DISPLAY_ALL)); | |
1384 | ||
a246b010 CL |
1385 | return 0; |
1386 | } | |
1387 | ||
9903cd1c CL |
1388 | /** |
1389 | * xs_setup_tcp - Set up transport to use a TCP socket | |
1390 | * @xprt: transport to set up | |
1391 | * @to: timeout parameters | |
1392 | * | |
1393 | */ | |
a246b010 CL |
1394 | int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to) |
1395 | { | |
1396 | size_t slot_table_size; | |
c4efcb1d | 1397 | struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr; |
a246b010 CL |
1398 | |
1399 | xprt->max_reqs = xprt_tcp_slot_table_entries; | |
1400 | slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); | |
0da974f4 | 1401 | xprt->slot = kzalloc(slot_table_size, GFP_KERNEL); |
a246b010 CL |
1402 | if (xprt->slot == NULL) |
1403 | return -ENOMEM; | |
a246b010 | 1404 | |
c4efcb1d | 1405 | if (ntohs(addr->sin_port) != 0) |
ec739ef0 | 1406 | xprt_set_bound(xprt); |
b85d8806 | 1407 | xprt->port = xs_get_random_port(); |
ec739ef0 CL |
1408 | |
1409 | xprt->prot = IPPROTO_TCP; | |
808012fb | 1410 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 1411 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 1412 | |
b0d93ad5 | 1413 | INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt); |
03bf4b70 CL |
1414 | xprt->bind_timeout = XS_BIND_TO; |
1415 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
1416 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
1417 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1418 | |
262965f5 | 1419 | xprt->ops = &xs_tcp_ops; |
a246b010 CL |
1420 | |
1421 | if (to) | |
1422 | xprt->timeout = *to; | |
1423 | else | |
9903cd1c | 1424 | xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); |
a246b010 | 1425 | |
edb267a6 CL |
1426 | xs_format_peer_addresses(xprt); |
1427 | dprintk("RPC: set up transport to address %s\n", | |
1428 | xs_print_peer_address(xprt, RPC_DISPLAY_ALL)); | |
1429 | ||
a246b010 CL |
1430 | return 0; |
1431 | } |