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 | ||
171 | static inline int xs_send_head(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, unsigned int len) | |
172 | { | |
173 | struct kvec iov = { | |
174 | .iov_base = xdr->head[0].iov_base + base, | |
175 | .iov_len = len - base, | |
176 | }; | |
177 | struct msghdr msg = { | |
178 | .msg_name = addr, | |
179 | .msg_namelen = addrlen, | |
180 | .msg_flags = XS_SENDMSG_FLAGS, | |
181 | }; | |
182 | ||
183 | if (xdr->len > len) | |
184 | msg.msg_flags |= MSG_MORE; | |
185 | ||
186 | if (likely(iov.iov_len)) | |
187 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); | |
188 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
189 | } | |
190 | ||
191 | static int xs_send_tail(struct socket *sock, struct xdr_buf *xdr, unsigned int base, unsigned int len) | |
192 | { | |
193 | struct kvec iov = { | |
194 | .iov_base = xdr->tail[0].iov_base + base, | |
195 | .iov_len = len - base, | |
196 | }; | |
197 | struct msghdr msg = { | |
198 | .msg_flags = XS_SENDMSG_FLAGS, | |
199 | }; | |
200 | ||
201 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); | |
202 | } | |
203 | ||
9903cd1c CL |
204 | /** |
205 | * xs_sendpages - write pages directly to a socket | |
206 | * @sock: socket to send on | |
207 | * @addr: UDP only -- address of destination | |
208 | * @addrlen: UDP only -- length of destination address | |
209 | * @xdr: buffer containing this request | |
210 | * @base: starting position in the buffer | |
211 | * | |
a246b010 | 212 | */ |
262965f5 | 213 | static inline int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 CL |
214 | { |
215 | struct page **ppage = xdr->pages; | |
216 | unsigned int len, pglen = xdr->page_len; | |
217 | int err, ret = 0; | |
a246b010 | 218 | |
262965f5 CL |
219 | if (unlikely(!sock)) |
220 | return -ENOTCONN; | |
221 | ||
222 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
223 | ||
a246b010 CL |
224 | len = xdr->head[0].iov_len; |
225 | if (base < len || (addr != NULL && base == 0)) { | |
b4b5cc85 | 226 | err = xs_send_head(sock, addr, addrlen, xdr, base, len); |
a246b010 CL |
227 | if (ret == 0) |
228 | ret = err; | |
229 | else if (err > 0) | |
230 | ret += err; | |
b4b5cc85 | 231 | if (err != (len - base)) |
a246b010 CL |
232 | goto out; |
233 | base = 0; | |
234 | } else | |
235 | base -= len; | |
236 | ||
b4b5cc85 | 237 | if (unlikely(pglen == 0)) |
a246b010 | 238 | goto copy_tail; |
b4b5cc85 | 239 | if (unlikely(base >= pglen)) { |
a246b010 CL |
240 | base -= pglen; |
241 | goto copy_tail; | |
242 | } | |
243 | if (base || xdr->page_base) { | |
244 | pglen -= base; | |
9903cd1c | 245 | base += xdr->page_base; |
a246b010 CL |
246 | ppage += base >> PAGE_CACHE_SHIFT; |
247 | base &= ~PAGE_CACHE_MASK; | |
248 | } | |
249 | ||
a246b010 | 250 | do { |
b4b5cc85 | 251 | int flags = XS_SENDMSG_FLAGS; |
a246b010 CL |
252 | |
253 | len = PAGE_CACHE_SIZE; | |
254 | if (base) | |
255 | len -= base; | |
256 | if (pglen < len) | |
257 | len = pglen; | |
258 | ||
259 | if (pglen != len || xdr->tail[0].iov_len != 0) | |
260 | flags |= MSG_MORE; | |
261 | ||
53fad3cb | 262 | err = kernel_sendpage(sock, *ppage, base, len, flags); |
a246b010 CL |
263 | if (ret == 0) |
264 | ret = err; | |
265 | else if (err > 0) | |
266 | ret += err; | |
267 | if (err != len) | |
268 | goto out; | |
269 | base = 0; | |
270 | ppage++; | |
271 | } while ((pglen -= len) != 0); | |
272 | copy_tail: | |
273 | len = xdr->tail[0].iov_len; | |
274 | if (base < len) { | |
b4b5cc85 | 275 | err = xs_send_tail(sock, xdr, base, len); |
a246b010 CL |
276 | if (ret == 0) |
277 | ret = err; | |
278 | else if (err > 0) | |
279 | ret += err; | |
280 | } | |
281 | out: | |
282 | return ret; | |
283 | } | |
284 | ||
9903cd1c | 285 | /** |
262965f5 CL |
286 | * xs_nospace - place task on wait queue if transmit was incomplete |
287 | * @task: task to put to sleep | |
9903cd1c | 288 | * |
a246b010 | 289 | */ |
262965f5 | 290 | static void xs_nospace(struct rpc_task *task) |
a246b010 | 291 | { |
262965f5 CL |
292 | struct rpc_rqst *req = task->tk_rqstp; |
293 | struct rpc_xprt *xprt = req->rq_xprt; | |
a246b010 | 294 | |
262965f5 CL |
295 | dprintk("RPC: %4d xmit incomplete (%u left of %u)\n", |
296 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, | |
297 | req->rq_slen); | |
298 | ||
299 | if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) { | |
300 | /* Protect against races with write_space */ | |
301 | spin_lock_bh(&xprt->transport_lock); | |
302 | ||
303 | /* Don't race with disconnect */ | |
304 | if (!xprt_connected(xprt)) | |
305 | task->tk_status = -ENOTCONN; | |
306 | else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags)) | |
307 | xprt_wait_for_buffer_space(task); | |
308 | ||
309 | spin_unlock_bh(&xprt->transport_lock); | |
310 | } else | |
311 | /* Keep holding the socket if it is blocked */ | |
312 | rpc_delay(task, HZ>>4); | |
313 | } | |
314 | ||
315 | /** | |
316 | * xs_udp_send_request - write an RPC request to a UDP socket | |
317 | * @task: address of RPC task that manages the state of an RPC request | |
318 | * | |
319 | * Return values: | |
320 | * 0: The request has been sent | |
321 | * EAGAIN: The socket was blocked, please call again later to | |
322 | * complete the request | |
323 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
324 | * other: Some other error occured, the request was not sent | |
325 | */ | |
326 | static int xs_udp_send_request(struct rpc_task *task) | |
327 | { | |
328 | struct rpc_rqst *req = task->tk_rqstp; | |
329 | struct rpc_xprt *xprt = req->rq_xprt; | |
330 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
331 | int status; | |
a246b010 | 332 | |
9903cd1c | 333 | xs_pktdump("packet data:", |
a246b010 CL |
334 | req->rq_svec->iov_base, |
335 | req->rq_svec->iov_len); | |
336 | ||
262965f5 CL |
337 | req->rq_xtime = jiffies; |
338 | status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr, | |
c4efcb1d | 339 | xprt->addrlen, xdr, req->rq_bytes_sent); |
a246b010 | 340 | |
262965f5 CL |
341 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
342 | xdr->len - req->rq_bytes_sent, status); | |
a246b010 | 343 | |
262965f5 CL |
344 | if (likely(status >= (int) req->rq_slen)) |
345 | return 0; | |
a246b010 | 346 | |
262965f5 CL |
347 | /* Still some bytes left; set up for a retry later. */ |
348 | if (status > 0) | |
349 | status = -EAGAIN; | |
a246b010 | 350 | |
262965f5 CL |
351 | switch (status) { |
352 | case -ENETUNREACH: | |
353 | case -EPIPE: | |
a246b010 CL |
354 | case -ECONNREFUSED: |
355 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 356 | * prompts ECONNREFUSED. */ |
a246b010 | 357 | break; |
262965f5 CL |
358 | case -EAGAIN: |
359 | xs_nospace(task); | |
a246b010 CL |
360 | break; |
361 | default: | |
262965f5 CL |
362 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
363 | -status); | |
9903cd1c | 364 | break; |
a246b010 | 365 | } |
262965f5 CL |
366 | |
367 | return status; | |
a246b010 CL |
368 | } |
369 | ||
808012fb CL |
370 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
371 | { | |
372 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
373 | rpc_fraghdr *base = buf->head[0].iov_base; | |
374 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
375 | } | |
376 | ||
9903cd1c | 377 | /** |
262965f5 | 378 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
379 | * @task: address of RPC task that manages the state of an RPC request |
380 | * | |
381 | * Return values: | |
262965f5 CL |
382 | * 0: The request has been sent |
383 | * EAGAIN: The socket was blocked, please call again later to | |
384 | * complete the request | |
385 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
386 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
387 | * |
388 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 389 | * if sendmsg is not able to make progress? |
9903cd1c | 390 | */ |
262965f5 | 391 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
392 | { |
393 | struct rpc_rqst *req = task->tk_rqstp; | |
394 | struct rpc_xprt *xprt = req->rq_xprt; | |
262965f5 | 395 | struct xdr_buf *xdr = &req->rq_snd_buf; |
a246b010 CL |
396 | int status, retry = 0; |
397 | ||
808012fb | 398 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 399 | |
262965f5 CL |
400 | xs_pktdump("packet data:", |
401 | req->rq_svec->iov_base, | |
402 | req->rq_svec->iov_len); | |
a246b010 CL |
403 | |
404 | /* Continue transmitting the packet/record. We must be careful | |
405 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 406 | * called sendmsg(). */ |
a246b010 CL |
407 | while (1) { |
408 | req->rq_xtime = jiffies; | |
262965f5 CL |
409 | status = xs_sendpages(xprt->sock, NULL, 0, xdr, |
410 | req->rq_bytes_sent); | |
a246b010 | 411 | |
262965f5 CL |
412 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
413 | xdr->len - req->rq_bytes_sent, status); | |
a246b010 | 414 | |
262965f5 | 415 | if (unlikely(status < 0)) |
a246b010 | 416 | break; |
a246b010 | 417 | |
262965f5 CL |
418 | /* If we've sent the entire packet, immediately |
419 | * reset the count of bytes sent. */ | |
420 | req->rq_bytes_sent += status; | |
ef759a2e | 421 | task->tk_bytes_sent += status; |
262965f5 CL |
422 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
423 | req->rq_bytes_sent = 0; | |
424 | return 0; | |
425 | } | |
a246b010 CL |
426 | |
427 | status = -EAGAIN; | |
262965f5 | 428 | if (retry++ > XS_SENDMSG_RETRY) |
a246b010 CL |
429 | break; |
430 | } | |
431 | ||
262965f5 CL |
432 | switch (status) { |
433 | case -EAGAIN: | |
434 | xs_nospace(task); | |
435 | break; | |
436 | case -ECONNREFUSED: | |
437 | case -ECONNRESET: | |
438 | case -ENOTCONN: | |
439 | case -EPIPE: | |
440 | status = -ENOTCONN; | |
441 | break; | |
442 | default: | |
443 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
444 | -status); | |
43118c29 | 445 | xprt_disconnect(xprt); |
262965f5 | 446 | break; |
a246b010 | 447 | } |
262965f5 | 448 | |
a246b010 CL |
449 | return status; |
450 | } | |
451 | ||
e0ab53de TM |
452 | /** |
453 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
454 | * @xprt: transport | |
455 | * @task: rpc task | |
456 | * | |
457 | * This cleans up if an error causes us to abort the transmission of a request. | |
458 | * In this case, the socket may need to be reset in order to avoid confusing | |
459 | * the server. | |
460 | */ | |
461 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
462 | { | |
463 | struct rpc_rqst *req; | |
464 | ||
465 | if (task != xprt->snd_task) | |
466 | return; | |
467 | if (task == NULL) | |
468 | goto out_release; | |
469 | req = task->tk_rqstp; | |
470 | if (req->rq_bytes_sent == 0) | |
471 | goto out_release; | |
472 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
473 | goto out_release; | |
474 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
475 | out_release: | |
476 | xprt_release_xprt(xprt, task); | |
477 | } | |
478 | ||
9903cd1c CL |
479 | /** |
480 | * xs_close - close a socket | |
481 | * @xprt: transport | |
482 | * | |
3167e12c CL |
483 | * This is used when all requests are complete; ie, no DRC state remains |
484 | * on the server we want to save. | |
a246b010 | 485 | */ |
9903cd1c | 486 | static void xs_close(struct rpc_xprt *xprt) |
a246b010 | 487 | { |
9903cd1c CL |
488 | struct socket *sock = xprt->sock; |
489 | struct sock *sk = xprt->inet; | |
a246b010 CL |
490 | |
491 | if (!sk) | |
632e3bdc | 492 | goto clear_close_wait; |
a246b010 | 493 | |
9903cd1c CL |
494 | dprintk("RPC: xs_close xprt %p\n", xprt); |
495 | ||
a246b010 CL |
496 | write_lock_bh(&sk->sk_callback_lock); |
497 | xprt->inet = NULL; | |
498 | xprt->sock = NULL; | |
499 | ||
9903cd1c CL |
500 | sk->sk_user_data = NULL; |
501 | sk->sk_data_ready = xprt->old_data_ready; | |
a246b010 | 502 | sk->sk_state_change = xprt->old_state_change; |
9903cd1c | 503 | sk->sk_write_space = xprt->old_write_space; |
a246b010 CL |
504 | write_unlock_bh(&sk->sk_callback_lock); |
505 | ||
9903cd1c | 506 | sk->sk_no_check = 0; |
a246b010 CL |
507 | |
508 | sock_release(sock); | |
632e3bdc TM |
509 | clear_close_wait: |
510 | smp_mb__before_clear_bit(); | |
511 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
512 | smp_mb__after_clear_bit(); | |
a246b010 CL |
513 | } |
514 | ||
9903cd1c CL |
515 | /** |
516 | * xs_destroy - prepare to shutdown a transport | |
517 | * @xprt: doomed transport | |
518 | * | |
519 | */ | |
520 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 521 | { |
9903cd1c CL |
522 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
523 | ||
55aa4f58 | 524 | cancel_delayed_work(&xprt->connect_worker); |
a246b010 CL |
525 | flush_scheduled_work(); |
526 | ||
527 | xprt_disconnect(xprt); | |
9903cd1c | 528 | xs_close(xprt); |
edb267a6 | 529 | xs_free_peer_addresses(xprt); |
a246b010 CL |
530 | kfree(xprt->slot); |
531 | } | |
532 | ||
9903cd1c CL |
533 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
534 | { | |
535 | return (struct rpc_xprt *) sk->sk_user_data; | |
536 | } | |
537 | ||
538 | /** | |
539 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
540 | * @sk: socket with data to read | |
541 | * @len: how much data to read | |
542 | * | |
a246b010 | 543 | */ |
9903cd1c | 544 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 545 | { |
9903cd1c CL |
546 | struct rpc_task *task; |
547 | struct rpc_xprt *xprt; | |
a246b010 | 548 | struct rpc_rqst *rovr; |
9903cd1c | 549 | struct sk_buff *skb; |
a246b010 | 550 | int err, repsize, copied; |
d8ed029d AD |
551 | u32 _xid; |
552 | __be32 *xp; | |
a246b010 CL |
553 | |
554 | read_lock(&sk->sk_callback_lock); | |
9903cd1c CL |
555 | dprintk("RPC: xs_udp_data_ready...\n"); |
556 | if (!(xprt = xprt_from_sock(sk))) | |
a246b010 | 557 | goto out; |
a246b010 CL |
558 | |
559 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
560 | goto out; | |
561 | ||
562 | if (xprt->shutdown) | |
563 | goto dropit; | |
564 | ||
565 | repsize = skb->len - sizeof(struct udphdr); | |
566 | if (repsize < 4) { | |
9903cd1c | 567 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
568 | goto dropit; |
569 | } | |
570 | ||
571 | /* Copy the XID from the skb... */ | |
572 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
573 | sizeof(_xid), &_xid); | |
574 | if (xp == NULL) | |
575 | goto dropit; | |
576 | ||
577 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 578 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
579 | rovr = xprt_lookup_rqst(xprt, *xp); |
580 | if (!rovr) | |
581 | goto out_unlock; | |
582 | task = rovr->rq_task; | |
583 | ||
a246b010 CL |
584 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
585 | copied = repsize; | |
586 | ||
587 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
588 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) | |
589 | goto out_unlock; | |
590 | ||
591 | /* Something worked... */ | |
592 | dst_confirm(skb->dst); | |
593 | ||
1570c1e4 CL |
594 | xprt_adjust_cwnd(task, copied); |
595 | xprt_update_rtt(task); | |
596 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
597 | |
598 | out_unlock: | |
4a0f8c04 | 599 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
600 | dropit: |
601 | skb_free_datagram(sk, skb); | |
602 | out: | |
603 | read_unlock(&sk->sk_callback_lock); | |
604 | } | |
605 | ||
9903cd1c | 606 | static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len) |
a246b010 CL |
607 | { |
608 | if (len > desc->count) | |
609 | len = desc->count; | |
610 | if (skb_copy_bits(desc->skb, desc->offset, p, len)) { | |
611 | dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n", | |
612 | len, desc->count); | |
613 | return 0; | |
614 | } | |
615 | desc->offset += len; | |
616 | desc->count -= len; | |
617 | dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n", | |
618 | len, desc->count); | |
619 | return len; | |
620 | } | |
621 | ||
9903cd1c | 622 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc) |
a246b010 CL |
623 | { |
624 | size_t len, used; | |
625 | char *p; | |
626 | ||
627 | p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset; | |
628 | len = sizeof(xprt->tcp_recm) - xprt->tcp_offset; | |
9903cd1c | 629 | used = xs_tcp_copy_data(desc, p, len); |
a246b010 CL |
630 | xprt->tcp_offset += used; |
631 | if (used != len) | |
632 | return; | |
808012fb | 633 | |
a246b010 | 634 | xprt->tcp_reclen = ntohl(xprt->tcp_recm); |
808012fb | 635 | if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) |
a246b010 CL |
636 | xprt->tcp_flags |= XPRT_LAST_FRAG; |
637 | else | |
638 | xprt->tcp_flags &= ~XPRT_LAST_FRAG; | |
808012fb CL |
639 | xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
640 | ||
a246b010 CL |
641 | xprt->tcp_flags &= ~XPRT_COPY_RECM; |
642 | xprt->tcp_offset = 0; | |
808012fb | 643 | |
a246b010 | 644 | /* Sanity check of the record length */ |
808012fb | 645 | if (unlikely(xprt->tcp_reclen < 4)) { |
9903cd1c | 646 | dprintk("RPC: invalid TCP record fragment length\n"); |
a246b010 | 647 | xprt_disconnect(xprt); |
9903cd1c | 648 | return; |
a246b010 CL |
649 | } |
650 | dprintk("RPC: reading TCP record fragment of length %d\n", | |
651 | xprt->tcp_reclen); | |
652 | } | |
653 | ||
9903cd1c | 654 | static void xs_tcp_check_recm(struct rpc_xprt *xprt) |
a246b010 CL |
655 | { |
656 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n", | |
657 | xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags); | |
658 | if (xprt->tcp_offset == xprt->tcp_reclen) { | |
659 | xprt->tcp_flags |= XPRT_COPY_RECM; | |
660 | xprt->tcp_offset = 0; | |
661 | if (xprt->tcp_flags & XPRT_LAST_FRAG) { | |
662 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
663 | xprt->tcp_flags |= XPRT_COPY_XID; | |
664 | xprt->tcp_copied = 0; | |
665 | } | |
666 | } | |
667 | } | |
668 | ||
9903cd1c | 669 | static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc) |
a246b010 CL |
670 | { |
671 | size_t len, used; | |
672 | char *p; | |
673 | ||
674 | len = sizeof(xprt->tcp_xid) - xprt->tcp_offset; | |
675 | dprintk("RPC: reading XID (%Zu bytes)\n", len); | |
676 | p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset; | |
9903cd1c | 677 | used = xs_tcp_copy_data(desc, p, len); |
a246b010 CL |
678 | xprt->tcp_offset += used; |
679 | if (used != len) | |
680 | return; | |
681 | xprt->tcp_flags &= ~XPRT_COPY_XID; | |
682 | xprt->tcp_flags |= XPRT_COPY_DATA; | |
683 | xprt->tcp_copied = 4; | |
684 | dprintk("RPC: reading reply for XID %08x\n", | |
685 | ntohl(xprt->tcp_xid)); | |
9903cd1c | 686 | xs_tcp_check_recm(xprt); |
a246b010 CL |
687 | } |
688 | ||
9903cd1c | 689 | static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc) |
a246b010 CL |
690 | { |
691 | struct rpc_rqst *req; | |
692 | struct xdr_buf *rcvbuf; | |
693 | size_t len; | |
694 | ssize_t r; | |
695 | ||
696 | /* Find and lock the request corresponding to this xid */ | |
4a0f8c04 | 697 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
698 | req = xprt_lookup_rqst(xprt, xprt->tcp_xid); |
699 | if (!req) { | |
700 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
701 | dprintk("RPC: XID %08x request not found!\n", | |
702 | ntohl(xprt->tcp_xid)); | |
4a0f8c04 | 703 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
704 | return; |
705 | } | |
706 | ||
707 | rcvbuf = &req->rq_private_buf; | |
708 | len = desc->count; | |
709 | if (len > xprt->tcp_reclen - xprt->tcp_offset) { | |
710 | skb_reader_t my_desc; | |
711 | ||
712 | len = xprt->tcp_reclen - xprt->tcp_offset; | |
713 | memcpy(&my_desc, desc, sizeof(my_desc)); | |
714 | my_desc.count = len; | |
715 | r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, | |
9903cd1c | 716 | &my_desc, xs_tcp_copy_data); |
a246b010 CL |
717 | desc->count -= r; |
718 | desc->offset += r; | |
719 | } else | |
720 | r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, | |
9903cd1c | 721 | desc, xs_tcp_copy_data); |
a246b010 CL |
722 | |
723 | if (r > 0) { | |
724 | xprt->tcp_copied += r; | |
725 | xprt->tcp_offset += r; | |
726 | } | |
727 | if (r != len) { | |
728 | /* Error when copying to the receive buffer, | |
729 | * usually because we weren't able to allocate | |
730 | * additional buffer pages. All we can do now | |
731 | * is turn off XPRT_COPY_DATA, so the request | |
732 | * will not receive any additional updates, | |
733 | * and time out. | |
734 | * Any remaining data from this record will | |
735 | * be discarded. | |
736 | */ | |
737 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
738 | dprintk("RPC: XID %08x truncated request\n", | |
739 | ntohl(xprt->tcp_xid)); | |
740 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", | |
741 | xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); | |
742 | goto out; | |
743 | } | |
744 | ||
745 | dprintk("RPC: XID %08x read %Zd bytes\n", | |
746 | ntohl(xprt->tcp_xid), r); | |
747 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", | |
748 | xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); | |
749 | ||
750 | if (xprt->tcp_copied == req->rq_private_buf.buflen) | |
751 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
752 | else if (xprt->tcp_offset == xprt->tcp_reclen) { | |
753 | if (xprt->tcp_flags & XPRT_LAST_FRAG) | |
754 | xprt->tcp_flags &= ~XPRT_COPY_DATA; | |
755 | } | |
756 | ||
757 | out: | |
1570c1e4 CL |
758 | if (!(xprt->tcp_flags & XPRT_COPY_DATA)) |
759 | xprt_complete_rqst(req->rq_task, xprt->tcp_copied); | |
4a0f8c04 | 760 | spin_unlock(&xprt->transport_lock); |
9903cd1c | 761 | xs_tcp_check_recm(xprt); |
a246b010 CL |
762 | } |
763 | ||
9903cd1c | 764 | static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc) |
a246b010 CL |
765 | { |
766 | size_t len; | |
767 | ||
768 | len = xprt->tcp_reclen - xprt->tcp_offset; | |
769 | if (len > desc->count) | |
770 | len = desc->count; | |
771 | desc->count -= len; | |
772 | desc->offset += len; | |
773 | xprt->tcp_offset += len; | |
774 | dprintk("RPC: discarded %Zu bytes\n", len); | |
9903cd1c | 775 | xs_tcp_check_recm(xprt); |
a246b010 CL |
776 | } |
777 | ||
9903cd1c | 778 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
779 | { |
780 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
781 | skb_reader_t desc = { | |
782 | .skb = skb, | |
783 | .offset = offset, | |
784 | .count = len, | |
785 | .csum = 0 | |
9903cd1c | 786 | }; |
a246b010 | 787 | |
9903cd1c | 788 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
789 | do { |
790 | /* Read in a new fragment marker if necessary */ | |
791 | /* Can we ever really expect to get completely empty fragments? */ | |
792 | if (xprt->tcp_flags & XPRT_COPY_RECM) { | |
9903cd1c | 793 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
794 | continue; |
795 | } | |
796 | /* Read in the xid if necessary */ | |
797 | if (xprt->tcp_flags & XPRT_COPY_XID) { | |
9903cd1c | 798 | xs_tcp_read_xid(xprt, &desc); |
a246b010 CL |
799 | continue; |
800 | } | |
801 | /* Read in the request data */ | |
802 | if (xprt->tcp_flags & XPRT_COPY_DATA) { | |
9903cd1c | 803 | xs_tcp_read_request(xprt, &desc); |
a246b010 CL |
804 | continue; |
805 | } | |
806 | /* Skip over any trailing bytes on short reads */ | |
9903cd1c | 807 | xs_tcp_read_discard(xprt, &desc); |
a246b010 | 808 | } while (desc.count); |
9903cd1c | 809 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
810 | return len - desc.count; |
811 | } | |
812 | ||
9903cd1c CL |
813 | /** |
814 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
815 | * @sk: socket with data to read | |
816 | * @bytes: how much data to read | |
817 | * | |
818 | */ | |
819 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
820 | { |
821 | struct rpc_xprt *xprt; | |
822 | read_descriptor_t rd_desc; | |
823 | ||
824 | read_lock(&sk->sk_callback_lock); | |
9903cd1c CL |
825 | dprintk("RPC: xs_tcp_data_ready...\n"); |
826 | if (!(xprt = xprt_from_sock(sk))) | |
a246b010 | 827 | goto out; |
a246b010 CL |
828 | if (xprt->shutdown) |
829 | goto out; | |
830 | ||
9903cd1c | 831 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 CL |
832 | rd_desc.arg.data = xprt; |
833 | rd_desc.count = 65536; | |
9903cd1c | 834 | tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
a246b010 CL |
835 | out: |
836 | read_unlock(&sk->sk_callback_lock); | |
837 | } | |
838 | ||
9903cd1c CL |
839 | /** |
840 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
841 | * @sk: socket whose state has changed | |
842 | * | |
843 | */ | |
844 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 845 | { |
9903cd1c | 846 | struct rpc_xprt *xprt; |
a246b010 CL |
847 | |
848 | read_lock(&sk->sk_callback_lock); | |
849 | if (!(xprt = xprt_from_sock(sk))) | |
850 | goto out; | |
9903cd1c | 851 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
a246b010 CL |
852 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", |
853 | sk->sk_state, xprt_connected(xprt), | |
854 | sock_flag(sk, SOCK_DEAD), | |
855 | sock_flag(sk, SOCK_ZAPPED)); | |
856 | ||
857 | switch (sk->sk_state) { | |
858 | case TCP_ESTABLISHED: | |
4a0f8c04 | 859 | spin_lock_bh(&xprt->transport_lock); |
a246b010 CL |
860 | if (!xprt_test_and_set_connected(xprt)) { |
861 | /* Reset TCP record info */ | |
862 | xprt->tcp_offset = 0; | |
863 | xprt->tcp_reclen = 0; | |
864 | xprt->tcp_copied = 0; | |
865 | xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID; | |
03bf4b70 | 866 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
44fbac22 | 867 | xprt_wake_pending_tasks(xprt, 0); |
a246b010 | 868 | } |
4a0f8c04 | 869 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 CL |
870 | break; |
871 | case TCP_SYN_SENT: | |
872 | case TCP_SYN_RECV: | |
873 | break; | |
632e3bdc TM |
874 | case TCP_CLOSE_WAIT: |
875 | /* Try to schedule an autoclose RPC calls */ | |
876 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
877 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
878 | schedule_work(&xprt->task_cleanup); | |
a246b010 CL |
879 | default: |
880 | xprt_disconnect(xprt); | |
a246b010 CL |
881 | } |
882 | out: | |
883 | read_unlock(&sk->sk_callback_lock); | |
884 | } | |
885 | ||
9903cd1c | 886 | /** |
c7b2cae8 CL |
887 | * xs_udp_write_space - callback invoked when socket buffer space |
888 | * becomes available | |
9903cd1c CL |
889 | * @sk: socket whose state has changed |
890 | * | |
a246b010 CL |
891 | * Called when more output buffer space is available for this socket. |
892 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 893 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
894 | * with a bunch of small requests. |
895 | */ | |
c7b2cae8 | 896 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 897 | { |
a246b010 | 898 | read_lock(&sk->sk_callback_lock); |
a246b010 | 899 | |
c7b2cae8 CL |
900 | /* from net/core/sock.c:sock_def_write_space */ |
901 | if (sock_writeable(sk)) { | |
902 | struct socket *sock; | |
903 | struct rpc_xprt *xprt; | |
904 | ||
905 | if (unlikely(!(sock = sk->sk_socket))) | |
a246b010 | 906 | goto out; |
c7b2cae8 CL |
907 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
908 | goto out; | |
909 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
a246b010 | 910 | goto out; |
c7b2cae8 CL |
911 | |
912 | xprt_write_space(xprt); | |
a246b010 CL |
913 | } |
914 | ||
c7b2cae8 CL |
915 | out: |
916 | read_unlock(&sk->sk_callback_lock); | |
917 | } | |
a246b010 | 918 | |
c7b2cae8 CL |
919 | /** |
920 | * xs_tcp_write_space - callback invoked when socket buffer space | |
921 | * becomes available | |
922 | * @sk: socket whose state has changed | |
923 | * | |
924 | * Called when more output buffer space is available for this socket. | |
925 | * We try not to wake our writers until they can make "significant" | |
926 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
927 | * with a bunch of small requests. | |
928 | */ | |
929 | static void xs_tcp_write_space(struct sock *sk) | |
930 | { | |
931 | read_lock(&sk->sk_callback_lock); | |
932 | ||
933 | /* from net/core/stream.c:sk_stream_write_space */ | |
934 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
935 | struct socket *sock; | |
936 | struct rpc_xprt *xprt; | |
937 | ||
938 | if (unlikely(!(sock = sk->sk_socket))) | |
939 | goto out; | |
940 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
941 | goto out; | |
942 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
943 | goto out; | |
944 | ||
945 | xprt_write_space(xprt); | |
946 | } | |
947 | ||
948 | out: | |
a246b010 CL |
949 | read_unlock(&sk->sk_callback_lock); |
950 | } | |
951 | ||
470056c2 | 952 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 CL |
953 | { |
954 | struct sock *sk = xprt->inet; | |
955 | ||
a246b010 CL |
956 | if (xprt->rcvsize) { |
957 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
958 | sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2; | |
959 | } | |
960 | if (xprt->sndsize) { | |
961 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
962 | sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2; | |
963 | sk->sk_write_space(sk); | |
964 | } | |
965 | } | |
966 | ||
43118c29 | 967 | /** |
470056c2 | 968 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 969 | * @xprt: generic transport |
470056c2 CL |
970 | * @sndsize: requested size of send buffer, in bytes |
971 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 972 | * |
470056c2 | 973 | * Set socket send and receive buffer size limits. |
43118c29 | 974 | */ |
470056c2 | 975 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 976 | { |
470056c2 CL |
977 | xprt->sndsize = 0; |
978 | if (sndsize) | |
979 | xprt->sndsize = sndsize + 1024; | |
980 | xprt->rcvsize = 0; | |
981 | if (rcvsize) | |
982 | xprt->rcvsize = rcvsize + 1024; | |
983 | ||
984 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
985 | } |
986 | ||
46c0ee8b CL |
987 | /** |
988 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
989 | * @task: task that timed out | |
990 | * | |
991 | * Adjust the congestion window after a retransmit timeout has occurred. | |
992 | */ | |
993 | static void xs_udp_timer(struct rpc_task *task) | |
994 | { | |
995 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
996 | } | |
997 | ||
b85d8806 CL |
998 | static unsigned short xs_get_random_port(void) |
999 | { | |
1000 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1001 | unsigned short rand = (unsigned short) net_random() % range; | |
1002 | return rand + xprt_min_resvport; | |
1003 | } | |
1004 | ||
edb267a6 CL |
1005 | /** |
1006 | * xs_print_peer_address - format an IPv4 address for printing | |
1007 | * @xprt: generic transport | |
1008 | * @format: flags field indicating which parts of the address to render | |
1009 | */ | |
1010 | static char *xs_print_peer_address(struct rpc_xprt *xprt, enum rpc_display_format_t format) | |
1011 | { | |
1012 | if (xprt->address_strings[format] != NULL) | |
1013 | return xprt->address_strings[format]; | |
1014 | else | |
1015 | return "unprintable"; | |
1016 | } | |
1017 | ||
92200412 CL |
1018 | /** |
1019 | * xs_set_port - reset the port number in the remote endpoint address | |
1020 | * @xprt: generic transport | |
1021 | * @port: new port number | |
1022 | * | |
1023 | */ | |
1024 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1025 | { | |
c4efcb1d CL |
1026 | struct sockaddr_in *sap = (struct sockaddr_in *) &xprt->addr; |
1027 | ||
92200412 | 1028 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d CL |
1029 | |
1030 | sap->sin_port = htons(port); | |
92200412 CL |
1031 | } |
1032 | ||
9903cd1c | 1033 | static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 CL |
1034 | { |
1035 | struct sockaddr_in myaddr = { | |
1036 | .sin_family = AF_INET, | |
1037 | }; | |
529b33c6 CL |
1038 | int err; |
1039 | unsigned short port = xprt->port; | |
a246b010 | 1040 | |
a246b010 CL |
1041 | do { |
1042 | myaddr.sin_port = htons(port); | |
e6242e92 | 1043 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 CL |
1044 | sizeof(myaddr)); |
1045 | if (err == 0) { | |
1046 | xprt->port = port; | |
9903cd1c CL |
1047 | dprintk("RPC: xs_bindresvport bound to port %u\n", |
1048 | port); | |
a246b010 CL |
1049 | return 0; |
1050 | } | |
529b33c6 CL |
1051 | if (port <= xprt_min_resvport) |
1052 | port = xprt_max_resvport; | |
1053 | else | |
1054 | port--; | |
a246b010 CL |
1055 | } while (err == -EADDRINUSE && port != xprt->port); |
1056 | ||
9903cd1c | 1057 | dprintk("RPC: can't bind to reserved port (%d).\n", -err); |
a246b010 CL |
1058 | return err; |
1059 | } | |
1060 | ||
b0d93ad5 CL |
1061 | /** |
1062 | * xs_udp_connect_worker - set up a UDP socket | |
1063 | * @args: RPC transport to connect | |
1064 | * | |
1065 | * Invoked by a work queue tasklet. | |
1066 | */ | |
1067 | static void xs_udp_connect_worker(void *args) | |
a246b010 | 1068 | { |
b0d93ad5 CL |
1069 | struct rpc_xprt *xprt = (struct rpc_xprt *) args; |
1070 | struct socket *sock = xprt->sock; | |
1071 | int err, status = -EIO; | |
9903cd1c | 1072 | |
ec739ef0 | 1073 | if (xprt->shutdown || !xprt_bound(xprt)) |
b0d93ad5 | 1074 | goto out; |
9903cd1c | 1075 | |
b0d93ad5 CL |
1076 | /* Start by resetting any existing state */ |
1077 | xs_close(xprt); | |
9903cd1c | 1078 | |
b0d93ad5 CL |
1079 | if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { |
1080 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); | |
1081 | goto out; | |
1082 | } | |
9903cd1c | 1083 | |
b0d93ad5 CL |
1084 | if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { |
1085 | sock_release(sock); | |
1086 | goto out; | |
1087 | } | |
9903cd1c | 1088 | |
edb267a6 CL |
1089 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
1090 | xprt, xs_print_peer_address(xprt, RPC_DISPLAY_ALL)); | |
1091 | ||
b0d93ad5 CL |
1092 | if (!xprt->inet) { |
1093 | struct sock *sk = sock->sk; | |
a246b010 | 1094 | |
b0d93ad5 | 1095 | write_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1096 | |
b0d93ad5 CL |
1097 | sk->sk_user_data = xprt; |
1098 | xprt->old_data_ready = sk->sk_data_ready; | |
1099 | xprt->old_state_change = sk->sk_state_change; | |
1100 | xprt->old_write_space = sk->sk_write_space; | |
9903cd1c | 1101 | sk->sk_data_ready = xs_udp_data_ready; |
c7b2cae8 | 1102 | sk->sk_write_space = xs_udp_write_space; |
a246b010 | 1103 | sk->sk_no_check = UDP_CSUM_NORCV; |
b079fa7b | 1104 | sk->sk_allocation = GFP_ATOMIC; |
b0d93ad5 | 1105 | |
a246b010 | 1106 | xprt_set_connected(xprt); |
a246b010 | 1107 | |
b0d93ad5 CL |
1108 | /* Reset to new socket */ |
1109 | xprt->sock = sock; | |
1110 | xprt->inet = sk; | |
a246b010 | 1111 | |
b0d93ad5 CL |
1112 | write_unlock_bh(&sk->sk_callback_lock); |
1113 | } | |
470056c2 | 1114 | xs_udp_do_set_buffer_size(xprt); |
b0d93ad5 CL |
1115 | status = 0; |
1116 | out: | |
1117 | xprt_wake_pending_tasks(xprt, status); | |
1118 | xprt_clear_connecting(xprt); | |
a246b010 CL |
1119 | } |
1120 | ||
3167e12c CL |
1121 | /* |
1122 | * We need to preserve the port number so the reply cache on the server can | |
1123 | * find our cached RPC replies when we get around to reconnecting. | |
1124 | */ | |
1125 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) | |
1126 | { | |
1127 | int result; | |
1128 | struct socket *sock = xprt->sock; | |
1129 | struct sockaddr any; | |
1130 | ||
1131 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); | |
1132 | ||
1133 | /* | |
1134 | * Disconnect the transport socket by doing a connect operation | |
1135 | * with AF_UNSPEC. This should return immediately... | |
1136 | */ | |
1137 | memset(&any, 0, sizeof(any)); | |
1138 | any.sa_family = AF_UNSPEC; | |
e6242e92 | 1139 | result = kernel_connect(sock, &any, sizeof(any), 0); |
3167e12c CL |
1140 | if (result) |
1141 | dprintk("RPC: AF_UNSPEC connect return code %d\n", | |
1142 | result); | |
1143 | } | |
1144 | ||
9903cd1c | 1145 | /** |
b0d93ad5 | 1146 | * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint |
9903cd1c CL |
1147 | * @args: RPC transport to connect |
1148 | * | |
1149 | * Invoked by a work queue tasklet. | |
a246b010 | 1150 | */ |
b0d93ad5 | 1151 | static void xs_tcp_connect_worker(void *args) |
a246b010 CL |
1152 | { |
1153 | struct rpc_xprt *xprt = (struct rpc_xprt *)args; | |
1154 | struct socket *sock = xprt->sock; | |
b0d93ad5 | 1155 | int err, status = -EIO; |
a246b010 | 1156 | |
ec739ef0 | 1157 | if (xprt->shutdown || !xprt_bound(xprt)) |
a246b010 CL |
1158 | goto out; |
1159 | ||
3167e12c CL |
1160 | if (!xprt->sock) { |
1161 | /* start from scratch */ | |
1162 | if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { | |
1163 | dprintk("RPC: can't create TCP transport socket (%d).\n", -err); | |
1164 | goto out; | |
1165 | } | |
a246b010 | 1166 | |
3167e12c CL |
1167 | if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { |
1168 | sock_release(sock); | |
1169 | goto out; | |
1170 | } | |
1171 | } else | |
1172 | /* "close" the socket, preserving the local port */ | |
1173 | xs_tcp_reuse_connection(xprt); | |
a246b010 | 1174 | |
edb267a6 CL |
1175 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
1176 | xprt, xs_print_peer_address(xprt, RPC_DISPLAY_ALL)); | |
1177 | ||
b0d93ad5 CL |
1178 | if (!xprt->inet) { |
1179 | struct sock *sk = sock->sk; | |
1180 | ||
1181 | write_lock_bh(&sk->sk_callback_lock); | |
1182 | ||
1183 | sk->sk_user_data = xprt; | |
1184 | xprt->old_data_ready = sk->sk_data_ready; | |
1185 | xprt->old_state_change = sk->sk_state_change; | |
1186 | xprt->old_write_space = sk->sk_write_space; | |
1187 | sk->sk_data_ready = xs_tcp_data_ready; | |
1188 | sk->sk_state_change = xs_tcp_state_change; | |
1189 | sk->sk_write_space = xs_tcp_write_space; | |
b079fa7b | 1190 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1191 | |
1192 | /* socket options */ | |
1193 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1194 | sock_reset_flag(sk, SOCK_LINGER); | |
1195 | tcp_sk(sk)->linger2 = 0; | |
1196 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1197 | |
1198 | xprt_clear_connected(xprt); | |
1199 | ||
1200 | /* Reset to new socket */ | |
1201 | xprt->sock = sock; | |
1202 | xprt->inet = sk; | |
1203 | ||
1204 | write_unlock_bh(&sk->sk_callback_lock); | |
1205 | } | |
1206 | ||
1207 | /* Tell the socket layer to start connecting... */ | |
262ca07d CL |
1208 | xprt->stat.connect_count++; |
1209 | xprt->stat.connect_start = jiffies; | |
e6242e92 | 1210 | status = kernel_connect(sock, (struct sockaddr *) &xprt->addr, |
c4efcb1d | 1211 | xprt->addrlen, O_NONBLOCK); |
a246b010 CL |
1212 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1213 | xprt, -status, xprt_connected(xprt), sock->sk->sk_state); | |
1214 | if (status < 0) { | |
1215 | switch (status) { | |
1216 | case -EINPROGRESS: | |
1217 | case -EALREADY: | |
1218 | goto out_clear; | |
3167e12c CL |
1219 | case -ECONNREFUSED: |
1220 | case -ECONNRESET: | |
1221 | /* retry with existing socket, after a delay */ | |
1222 | break; | |
1223 | default: | |
1224 | /* get rid of existing socket, and retry */ | |
1225 | xs_close(xprt); | |
1226 | break; | |
a246b010 CL |
1227 | } |
1228 | } | |
1229 | out: | |
44fbac22 | 1230 | xprt_wake_pending_tasks(xprt, status); |
a246b010 | 1231 | out_clear: |
2226feb6 | 1232 | xprt_clear_connecting(xprt); |
a246b010 CL |
1233 | } |
1234 | ||
9903cd1c CL |
1235 | /** |
1236 | * xs_connect - connect a socket to a remote endpoint | |
1237 | * @task: address of RPC task that manages state of connect request | |
1238 | * | |
1239 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
1240 | * |
1241 | * UDP socket connects are synchronous, but we use a work queue anyway | |
1242 | * to guarantee that even unprivileged user processes can set up a | |
1243 | * socket on a privileged port. | |
1244 | * | |
1245 | * If a UDP socket connect fails, the delay behavior here prevents | |
1246 | * retry floods (hard mounts). | |
9903cd1c CL |
1247 | */ |
1248 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
1249 | { |
1250 | struct rpc_xprt *xprt = task->tk_xprt; | |
1251 | ||
b0d93ad5 CL |
1252 | if (xprt_test_and_set_connecting(xprt)) |
1253 | return; | |
1254 | ||
1255 | if (xprt->sock != NULL) { | |
03bf4b70 CL |
1256 | dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n", |
1257 | xprt, xprt->reestablish_timeout / HZ); | |
b0d93ad5 | 1258 | schedule_delayed_work(&xprt->connect_worker, |
03bf4b70 CL |
1259 | xprt->reestablish_timeout); |
1260 | xprt->reestablish_timeout <<= 1; | |
1261 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) | |
1262 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 CL |
1263 | } else { |
1264 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); | |
52bad64d | 1265 | schedule_delayed_work(&xprt->connect_worker, 0); |
b0d93ad5 CL |
1266 | |
1267 | /* flush_scheduled_work can sleep... */ | |
1268 | if (!RPC_IS_ASYNC(task)) | |
1269 | flush_scheduled_work(); | |
a246b010 CL |
1270 | } |
1271 | } | |
1272 | ||
262ca07d CL |
1273 | /** |
1274 | * xs_udp_print_stats - display UDP socket-specifc stats | |
1275 | * @xprt: rpc_xprt struct containing statistics | |
1276 | * @seq: output file | |
1277 | * | |
1278 | */ | |
1279 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1280 | { | |
1281 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", | |
1282 | xprt->port, | |
1283 | xprt->stat.bind_count, | |
1284 | xprt->stat.sends, | |
1285 | xprt->stat.recvs, | |
1286 | xprt->stat.bad_xids, | |
1287 | xprt->stat.req_u, | |
1288 | xprt->stat.bklog_u); | |
1289 | } | |
1290 | ||
1291 | /** | |
1292 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
1293 | * @xprt: rpc_xprt struct containing statistics | |
1294 | * @seq: output file | |
1295 | * | |
1296 | */ | |
1297 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1298 | { | |
1299 | long idle_time = 0; | |
1300 | ||
1301 | if (xprt_connected(xprt)) | |
1302 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
1303 | ||
1304 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
1305 | xprt->port, | |
1306 | xprt->stat.bind_count, | |
1307 | xprt->stat.connect_count, | |
1308 | xprt->stat.connect_time, | |
1309 | idle_time, | |
1310 | xprt->stat.sends, | |
1311 | xprt->stat.recvs, | |
1312 | xprt->stat.bad_xids, | |
1313 | xprt->stat.req_u, | |
1314 | xprt->stat.bklog_u); | |
1315 | } | |
1316 | ||
262965f5 | 1317 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 1318 | .set_buffer_size = xs_udp_set_buffer_size, |
edb267a6 | 1319 | .print_addr = xs_print_peer_address, |
12a80469 | 1320 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 1321 | .release_xprt = xprt_release_xprt_cong, |
bbf7c1dd | 1322 | .rpcbind = rpc_getport, |
92200412 | 1323 | .set_port = xs_set_port, |
262965f5 | 1324 | .connect = xs_connect, |
02107148 CL |
1325 | .buf_alloc = rpc_malloc, |
1326 | .buf_free = rpc_free, | |
262965f5 | 1327 | .send_request = xs_udp_send_request, |
fe3aca29 | 1328 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 1329 | .timer = xs_udp_timer, |
a58dd398 | 1330 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
1331 | .close = xs_close, |
1332 | .destroy = xs_destroy, | |
262ca07d | 1333 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
1334 | }; |
1335 | ||
1336 | static struct rpc_xprt_ops xs_tcp_ops = { | |
edb267a6 | 1337 | .print_addr = xs_print_peer_address, |
12a80469 | 1338 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 1339 | .release_xprt = xs_tcp_release_xprt, |
bbf7c1dd | 1340 | .rpcbind = rpc_getport, |
92200412 | 1341 | .set_port = xs_set_port, |
9903cd1c | 1342 | .connect = xs_connect, |
02107148 CL |
1343 | .buf_alloc = rpc_malloc, |
1344 | .buf_free = rpc_free, | |
262965f5 | 1345 | .send_request = xs_tcp_send_request, |
fe3aca29 | 1346 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
9903cd1c CL |
1347 | .close = xs_close, |
1348 | .destroy = xs_destroy, | |
262ca07d | 1349 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
1350 | }; |
1351 | ||
9903cd1c CL |
1352 | /** |
1353 | * xs_setup_udp - Set up transport to use a UDP socket | |
1354 | * @xprt: transport to set up | |
1355 | * @to: timeout parameters | |
1356 | * | |
1357 | */ | |
a246b010 CL |
1358 | int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to) |
1359 | { | |
1360 | size_t slot_table_size; | |
c4efcb1d | 1361 | struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr; |
a246b010 CL |
1362 | |
1363 | xprt->max_reqs = xprt_udp_slot_table_entries; | |
1364 | slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); | |
0da974f4 | 1365 | xprt->slot = kzalloc(slot_table_size, GFP_KERNEL); |
a246b010 CL |
1366 | if (xprt->slot == NULL) |
1367 | return -ENOMEM; | |
a246b010 | 1368 | |
b7766da7 | 1369 | if (ntohs(addr->sin_port) != 0) |
ec739ef0 | 1370 | xprt_set_bound(xprt); |
b85d8806 | 1371 | xprt->port = xs_get_random_port(); |
ec739ef0 CL |
1372 | |
1373 | xprt->prot = IPPROTO_UDP; | |
808012fb | 1374 | xprt->tsh_size = 0; |
a246b010 CL |
1375 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
1376 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
1377 | ||
52bad64d | 1378 | INIT_DELAYED_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt); |
03bf4b70 CL |
1379 | xprt->bind_timeout = XS_BIND_TO; |
1380 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
1381 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
1382 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1383 | |
262965f5 | 1384 | xprt->ops = &xs_udp_ops; |
a246b010 CL |
1385 | |
1386 | if (to) | |
1387 | xprt->timeout = *to; | |
1388 | else | |
9903cd1c | 1389 | xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); |
a246b010 | 1390 | |
edb267a6 CL |
1391 | xs_format_peer_addresses(xprt); |
1392 | dprintk("RPC: set up transport to address %s\n", | |
1393 | xs_print_peer_address(xprt, RPC_DISPLAY_ALL)); | |
1394 | ||
a246b010 CL |
1395 | return 0; |
1396 | } | |
1397 | ||
9903cd1c CL |
1398 | /** |
1399 | * xs_setup_tcp - Set up transport to use a TCP socket | |
1400 | * @xprt: transport to set up | |
1401 | * @to: timeout parameters | |
1402 | * | |
1403 | */ | |
a246b010 CL |
1404 | int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to) |
1405 | { | |
1406 | size_t slot_table_size; | |
c4efcb1d | 1407 | struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr; |
a246b010 CL |
1408 | |
1409 | xprt->max_reqs = xprt_tcp_slot_table_entries; | |
1410 | slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); | |
0da974f4 | 1411 | xprt->slot = kzalloc(slot_table_size, GFP_KERNEL); |
a246b010 CL |
1412 | if (xprt->slot == NULL) |
1413 | return -ENOMEM; | |
a246b010 | 1414 | |
c4efcb1d | 1415 | if (ntohs(addr->sin_port) != 0) |
ec739ef0 | 1416 | xprt_set_bound(xprt); |
b85d8806 | 1417 | xprt->port = xs_get_random_port(); |
ec739ef0 CL |
1418 | |
1419 | xprt->prot = IPPROTO_TCP; | |
808012fb | 1420 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 1421 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 1422 | |
52bad64d | 1423 | INIT_DELAYED_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt); |
03bf4b70 CL |
1424 | xprt->bind_timeout = XS_BIND_TO; |
1425 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
1426 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
1427 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1428 | |
262965f5 | 1429 | xprt->ops = &xs_tcp_ops; |
a246b010 CL |
1430 | |
1431 | if (to) | |
1432 | xprt->timeout = *to; | |
1433 | else | |
9903cd1c | 1434 | xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); |
a246b010 | 1435 | |
edb267a6 CL |
1436 | xs_format_peer_addresses(xprt); |
1437 | dprintk("RPC: set up transport to address %s\n", | |
1438 | xs_print_peer_address(xprt, RPC_DISPLAY_ALL)); | |
1439 | ||
a246b010 CL |
1440 | return 0; |
1441 | } |