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Commit | Line | Data |
---|---|---|
a246b010 CL |
1 | /* |
2 | * linux/net/sunrpc/xprtsock.c | |
3 | * | |
4 | * Client-side transport implementation for sockets. | |
5 | * | |
113aa838 AC |
6 | * TCP callback races fixes (C) 1998 Red Hat |
7 | * TCP send fixes (C) 1998 Red Hat | |
a246b010 CL |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> | |
10 | * | |
11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. | |
12 | * Fix behaviour when socket buffer is full. | |
13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/slab.h> | |
bc25571e | 23 | #include <linux/module.h> |
a246b010 | 24 | #include <linux/capability.h> |
a246b010 CL |
25 | #include <linux/pagemap.h> |
26 | #include <linux/errno.h> | |
27 | #include <linux/socket.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/net.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/udp.h> | |
32 | #include <linux/tcp.h> | |
33 | #include <linux/sunrpc/clnt.h> | |
02107148 | 34 | #include <linux/sunrpc/sched.h> |
49c36fcc | 35 | #include <linux/sunrpc/xprtsock.h> |
a246b010 CL |
36 | #include <linux/file.h> |
37 | ||
38 | #include <net/sock.h> | |
39 | #include <net/checksum.h> | |
40 | #include <net/udp.h> | |
41 | #include <net/tcp.h> | |
42 | ||
c556b754 CL |
43 | /* |
44 | * xprtsock tunables | |
45 | */ | |
46 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
47 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
48 | ||
49 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
50 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
51 | ||
7d1e8255 TM |
52 | #define XS_TCP_LINGER_TO (15U * HZ) |
53 | ||
fbf76683 CL |
54 | /* |
55 | * We can register our own files under /proc/sys/sunrpc by | |
56 | * calling register_sysctl_table() again. The files in that | |
57 | * directory become the union of all files registered there. | |
58 | * | |
59 | * We simply need to make sure that we don't collide with | |
60 | * someone else's file names! | |
61 | */ | |
62 | ||
63 | #ifdef RPC_DEBUG | |
64 | ||
65 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
66 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
67 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; | |
68 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
69 | ||
70 | static struct ctl_table_header *sunrpc_table_header; | |
71 | ||
72 | /* | |
73 | * FIXME: changing the UDP slot table size should also resize the UDP | |
74 | * socket buffers for existing UDP transports | |
75 | */ | |
76 | static ctl_table xs_tunables_table[] = { | |
77 | { | |
78 | .ctl_name = CTL_SLOTTABLE_UDP, | |
79 | .procname = "udp_slot_table_entries", | |
80 | .data = &xprt_udp_slot_table_entries, | |
81 | .maxlen = sizeof(unsigned int), | |
82 | .mode = 0644, | |
83 | .proc_handler = &proc_dointvec_minmax, | |
84 | .strategy = &sysctl_intvec, | |
85 | .extra1 = &min_slot_table_size, | |
86 | .extra2 = &max_slot_table_size | |
87 | }, | |
88 | { | |
89 | .ctl_name = CTL_SLOTTABLE_TCP, | |
90 | .procname = "tcp_slot_table_entries", | |
91 | .data = &xprt_tcp_slot_table_entries, | |
92 | .maxlen = sizeof(unsigned int), | |
93 | .mode = 0644, | |
94 | .proc_handler = &proc_dointvec_minmax, | |
95 | .strategy = &sysctl_intvec, | |
96 | .extra1 = &min_slot_table_size, | |
97 | .extra2 = &max_slot_table_size | |
98 | }, | |
99 | { | |
100 | .ctl_name = CTL_MIN_RESVPORT, | |
101 | .procname = "min_resvport", | |
102 | .data = &xprt_min_resvport, | |
103 | .maxlen = sizeof(unsigned int), | |
104 | .mode = 0644, | |
105 | .proc_handler = &proc_dointvec_minmax, | |
106 | .strategy = &sysctl_intvec, | |
107 | .extra1 = &xprt_min_resvport_limit, | |
108 | .extra2 = &xprt_max_resvport_limit | |
109 | }, | |
110 | { | |
111 | .ctl_name = CTL_MAX_RESVPORT, | |
112 | .procname = "max_resvport", | |
113 | .data = &xprt_max_resvport, | |
114 | .maxlen = sizeof(unsigned int), | |
115 | .mode = 0644, | |
116 | .proc_handler = &proc_dointvec_minmax, | |
117 | .strategy = &sysctl_intvec, | |
118 | .extra1 = &xprt_min_resvport_limit, | |
119 | .extra2 = &xprt_max_resvport_limit | |
120 | }, | |
121 | { | |
122 | .ctl_name = 0, | |
123 | }, | |
124 | }; | |
125 | ||
126 | static ctl_table sunrpc_table[] = { | |
127 | { | |
128 | .ctl_name = CTL_SUNRPC, | |
129 | .procname = "sunrpc", | |
130 | .mode = 0555, | |
131 | .child = xs_tunables_table | |
132 | }, | |
133 | { | |
134 | .ctl_name = 0, | |
135 | }, | |
136 | }; | |
137 | ||
138 | #endif | |
139 | ||
03bf4b70 CL |
140 | /* |
141 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
142 | * synchronous, but we set a timeout anyway in case of resource | |
143 | * exhaustion on the local host. | |
144 | */ | |
145 | #define XS_UDP_CONN_TO (5U * HZ) | |
146 | ||
147 | /* | |
148 | * Wait duration for an RPC TCP connection to be established. Solaris | |
149 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
150 | * long a server takes to reboot. | |
151 | */ | |
152 | #define XS_TCP_CONN_TO (60U * HZ) | |
153 | ||
154 | /* | |
155 | * Wait duration for a reply from the RPC portmapper. | |
156 | */ | |
157 | #define XS_BIND_TO (60U * HZ) | |
158 | ||
159 | /* | |
160 | * Delay if a UDP socket connect error occurs. This is most likely some | |
161 | * kind of resource problem on the local host. | |
162 | */ | |
163 | #define XS_UDP_REEST_TO (2U * HZ) | |
164 | ||
165 | /* | |
166 | * The reestablish timeout allows clients to delay for a bit before attempting | |
167 | * to reconnect to a server that just dropped our connection. | |
168 | * | |
169 | * We implement an exponential backoff when trying to reestablish a TCP | |
170 | * transport connection with the server. Some servers like to drop a TCP | |
171 | * connection when they are overworked, so we start with a short timeout and | |
172 | * increase over time if the server is down or not responding. | |
173 | */ | |
174 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
175 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
176 | ||
177 | /* | |
178 | * TCP idle timeout; client drops the transport socket if it is idle | |
179 | * for this long. Note that we also timeout UDP sockets to prevent | |
180 | * holding port numbers when there is no RPC traffic. | |
181 | */ | |
182 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
183 | ||
a246b010 CL |
184 | #ifdef RPC_DEBUG |
185 | # undef RPC_DEBUG_DATA | |
9903cd1c | 186 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
187 | #endif |
188 | ||
a246b010 | 189 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 190 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 191 | { |
9903cd1c CL |
192 | u8 *buf = (u8 *) packet; |
193 | int j; | |
a246b010 | 194 | |
46121cf7 | 195 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
196 | for (j = 0; j < count && j < 128; j += 4) { |
197 | if (!(j & 31)) { | |
198 | if (j) | |
199 | dprintk("\n"); | |
200 | dprintk("0x%04x ", j); | |
201 | } | |
202 | dprintk("%02x%02x%02x%02x ", | |
203 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
204 | } | |
205 | dprintk("\n"); | |
206 | } | |
207 | #else | |
9903cd1c | 208 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
209 | { |
210 | /* NOP */ | |
211 | } | |
212 | #endif | |
213 | ||
ffc2e518 CL |
214 | struct sock_xprt { |
215 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
216 | |
217 | /* | |
218 | * Network layer | |
219 | */ | |
220 | struct socket * sock; | |
221 | struct sock * inet; | |
51971139 CL |
222 | |
223 | /* | |
224 | * State of TCP reply receive | |
225 | */ | |
226 | __be32 tcp_fraghdr, | |
227 | tcp_xid; | |
228 | ||
229 | u32 tcp_offset, | |
230 | tcp_reclen; | |
231 | ||
232 | unsigned long tcp_copied, | |
233 | tcp_flags; | |
c8475461 CL |
234 | |
235 | /* | |
236 | * Connection of transports | |
237 | */ | |
34161db6 | 238 | struct delayed_work connect_worker; |
d3bc9a1d | 239 | struct sockaddr_storage addr; |
c8475461 | 240 | unsigned short port; |
7c6e066e CL |
241 | |
242 | /* | |
243 | * UDP socket buffer size parameters | |
244 | */ | |
245 | size_t rcvsize, | |
246 | sndsize; | |
314dfd79 CL |
247 | |
248 | /* | |
249 | * Saved socket callback addresses | |
250 | */ | |
251 | void (*old_data_ready)(struct sock *, int); | |
252 | void (*old_state_change)(struct sock *); | |
253 | void (*old_write_space)(struct sock *); | |
2a9e1cfa | 254 | void (*old_error_report)(struct sock *); |
ffc2e518 CL |
255 | }; |
256 | ||
e136d092 CL |
257 | /* |
258 | * TCP receive state flags | |
259 | */ | |
260 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
261 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
262 | #define TCP_RCV_COPY_XID (1UL << 2) | |
263 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
264 | ||
95392c59 CL |
265 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
266 | { | |
267 | return (struct sockaddr *) &xprt->addr; | |
268 | } | |
269 | ||
270 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) | |
edb267a6 | 271 | { |
95392c59 CL |
272 | return (struct sockaddr_in *) &xprt->addr; |
273 | } | |
274 | ||
275 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
276 | { | |
277 | return (struct sockaddr_in6 *) &xprt->addr; | |
278 | } | |
279 | ||
b454ae90 CL |
280 | static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt, |
281 | const char *protocol, | |
282 | const char *netid) | |
edb267a6 | 283 | { |
95392c59 | 284 | struct sockaddr_in *addr = xs_addr_in(xprt); |
edb267a6 CL |
285 | char *buf; |
286 | ||
287 | buf = kzalloc(20, GFP_KERNEL); | |
288 | if (buf) { | |
e0db4a78 | 289 | snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr); |
edb267a6 CL |
290 | } |
291 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
292 | ||
293 | buf = kzalloc(8, GFP_KERNEL); | |
294 | if (buf) { | |
295 | snprintf(buf, 8, "%u", | |
296 | ntohs(addr->sin_port)); | |
297 | } | |
298 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
299 | ||
b454ae90 | 300 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
edb267a6 CL |
301 | |
302 | buf = kzalloc(48, GFP_KERNEL); | |
303 | if (buf) { | |
21454aaa HH |
304 | snprintf(buf, 48, "addr=%pI4 port=%u proto=%s", |
305 | &addr->sin_addr.s_addr, | |
edb267a6 | 306 | ntohs(addr->sin_port), |
b454ae90 | 307 | protocol); |
edb267a6 CL |
308 | } |
309 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
fbfe3cc6 CL |
310 | |
311 | buf = kzalloc(10, GFP_KERNEL); | |
312 | if (buf) { | |
313 | snprintf(buf, 10, "%02x%02x%02x%02x", | |
314 | NIPQUAD(addr->sin_addr.s_addr)); | |
315 | } | |
316 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; | |
317 | ||
318 | buf = kzalloc(8, GFP_KERNEL); | |
319 | if (buf) { | |
320 | snprintf(buf, 8, "%4hx", | |
321 | ntohs(addr->sin_port)); | |
322 | } | |
323 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; | |
756805e7 CL |
324 | |
325 | buf = kzalloc(30, GFP_KERNEL); | |
326 | if (buf) { | |
21454aaa HH |
327 | snprintf(buf, 30, "%pI4.%u.%u", |
328 | &addr->sin_addr.s_addr, | |
756805e7 CL |
329 | ntohs(addr->sin_port) >> 8, |
330 | ntohs(addr->sin_port) & 0xff); | |
331 | } | |
332 | xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; | |
4417c8c4 | 333 | |
b454ae90 | 334 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
edb267a6 CL |
335 | } |
336 | ||
b454ae90 CL |
337 | static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt, |
338 | const char *protocol, | |
339 | const char *netid) | |
4b6473fb | 340 | { |
95392c59 | 341 | struct sockaddr_in6 *addr = xs_addr_in6(xprt); |
4b6473fb CL |
342 | char *buf; |
343 | ||
344 | buf = kzalloc(40, GFP_KERNEL); | |
345 | if (buf) { | |
5b095d98 | 346 | snprintf(buf, 40, "%pI6",&addr->sin6_addr); |
4b6473fb CL |
347 | } |
348 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
349 | ||
350 | buf = kzalloc(8, GFP_KERNEL); | |
351 | if (buf) { | |
352 | snprintf(buf, 8, "%u", | |
353 | ntohs(addr->sin6_port)); | |
354 | } | |
355 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
356 | ||
b454ae90 | 357 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
4b6473fb CL |
358 | |
359 | buf = kzalloc(64, GFP_KERNEL); | |
360 | if (buf) { | |
5b095d98 | 361 | snprintf(buf, 64, "addr=%pI6 port=%u proto=%s", |
fdb46ee7 | 362 | &addr->sin6_addr, |
4b6473fb | 363 | ntohs(addr->sin6_port), |
b454ae90 | 364 | protocol); |
4b6473fb CL |
365 | } |
366 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
367 | ||
368 | buf = kzalloc(36, GFP_KERNEL); | |
b071195d | 369 | if (buf) |
4b7a4274 | 370 | snprintf(buf, 36, "%pi6", &addr->sin6_addr); |
b071195d | 371 | |
4b6473fb CL |
372 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; |
373 | ||
374 | buf = kzalloc(8, GFP_KERNEL); | |
375 | if (buf) { | |
376 | snprintf(buf, 8, "%4hx", | |
377 | ntohs(addr->sin6_port)); | |
378 | } | |
379 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; | |
756805e7 CL |
380 | |
381 | buf = kzalloc(50, GFP_KERNEL); | |
382 | if (buf) { | |
5b095d98 | 383 | snprintf(buf, 50, "%pI6.%u.%u", |
fdb46ee7 HH |
384 | &addr->sin6_addr, |
385 | ntohs(addr->sin6_port) >> 8, | |
386 | ntohs(addr->sin6_port) & 0xff); | |
756805e7 CL |
387 | } |
388 | xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; | |
4417c8c4 | 389 | |
b454ae90 | 390 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
edb267a6 CL |
391 | } |
392 | ||
393 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
394 | { | |
33e01dc7 CL |
395 | unsigned int i; |
396 | ||
397 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
398 | switch (i) { | |
399 | case RPC_DISPLAY_PROTO: | |
400 | case RPC_DISPLAY_NETID: | |
401 | continue; | |
402 | default: | |
403 | kfree(xprt->address_strings[i]); | |
404 | } | |
edb267a6 CL |
405 | } |
406 | ||
b4b5cc85 CL |
407 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
408 | ||
24c5684b | 409 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 410 | { |
b4b5cc85 CL |
411 | struct msghdr msg = { |
412 | .msg_name = addr, | |
413 | .msg_namelen = addrlen, | |
24c5684b TM |
414 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
415 | }; | |
416 | struct kvec iov = { | |
417 | .iov_base = vec->iov_base + base, | |
418 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
419 | }; |
420 | ||
24c5684b | 421 | if (iov.iov_len != 0) |
b4b5cc85 CL |
422 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
423 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
424 | } | |
425 | ||
24c5684b | 426 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 427 | { |
24c5684b TM |
428 | struct page **ppage; |
429 | unsigned int remainder; | |
430 | int err, sent = 0; | |
431 | ||
432 | remainder = xdr->page_len - base; | |
433 | base += xdr->page_base; | |
434 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
435 | base &= ~PAGE_MASK; | |
436 | for(;;) { | |
437 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
438 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 439 | |
24c5684b TM |
440 | remainder -= len; |
441 | if (remainder != 0 || more) | |
442 | flags |= MSG_MORE; | |
443 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
444 | if (remainder == 0 || err != len) | |
445 | break; | |
446 | sent += err; | |
447 | ppage++; | |
448 | base = 0; | |
449 | } | |
450 | if (sent == 0) | |
451 | return err; | |
452 | if (err > 0) | |
453 | sent += err; | |
454 | return sent; | |
b4b5cc85 CL |
455 | } |
456 | ||
9903cd1c CL |
457 | /** |
458 | * xs_sendpages - write pages directly to a socket | |
459 | * @sock: socket to send on | |
460 | * @addr: UDP only -- address of destination | |
461 | * @addrlen: UDP only -- length of destination address | |
462 | * @xdr: buffer containing this request | |
463 | * @base: starting position in the buffer | |
464 | * | |
a246b010 | 465 | */ |
24c5684b | 466 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 467 | { |
24c5684b TM |
468 | unsigned int remainder = xdr->len - base; |
469 | int err, sent = 0; | |
a246b010 | 470 | |
262965f5 | 471 | if (unlikely(!sock)) |
fba91afb | 472 | return -ENOTSOCK; |
262965f5 CL |
473 | |
474 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
475 | if (base != 0) { |
476 | addr = NULL; | |
477 | addrlen = 0; | |
478 | } | |
262965f5 | 479 | |
24c5684b TM |
480 | if (base < xdr->head[0].iov_len || addr != NULL) { |
481 | unsigned int len = xdr->head[0].iov_len - base; | |
482 | remainder -= len; | |
483 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
484 | if (remainder == 0 || err != len) | |
a246b010 | 485 | goto out; |
24c5684b | 486 | sent += err; |
a246b010 CL |
487 | base = 0; |
488 | } else | |
24c5684b | 489 | base -= xdr->head[0].iov_len; |
a246b010 | 490 | |
24c5684b TM |
491 | if (base < xdr->page_len) { |
492 | unsigned int len = xdr->page_len - base; | |
493 | remainder -= len; | |
494 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
495 | if (remainder == 0 || err != len) | |
a246b010 | 496 | goto out; |
24c5684b | 497 | sent += err; |
a246b010 | 498 | base = 0; |
24c5684b TM |
499 | } else |
500 | base -= xdr->page_len; | |
501 | ||
502 | if (base >= xdr->tail[0].iov_len) | |
503 | return sent; | |
504 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 505 | out: |
24c5684b TM |
506 | if (sent == 0) |
507 | return err; | |
508 | if (err > 0) | |
509 | sent += err; | |
510 | return sent; | |
a246b010 CL |
511 | } |
512 | ||
b6ddf64f TM |
513 | static void xs_nospace_callback(struct rpc_task *task) |
514 | { | |
515 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
516 | ||
517 | transport->inet->sk_write_pending--; | |
518 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
519 | } | |
520 | ||
9903cd1c | 521 | /** |
262965f5 CL |
522 | * xs_nospace - place task on wait queue if transmit was incomplete |
523 | * @task: task to put to sleep | |
9903cd1c | 524 | * |
a246b010 | 525 | */ |
5e3771ce | 526 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 527 | { |
262965f5 CL |
528 | struct rpc_rqst *req = task->tk_rqstp; |
529 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 530 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
5e3771ce | 531 | int ret = 0; |
a246b010 | 532 | |
46121cf7 | 533 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
534 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
535 | req->rq_slen); | |
536 | ||
b6ddf64f TM |
537 | /* Protect against races with write_space */ |
538 | spin_lock_bh(&xprt->transport_lock); | |
539 | ||
540 | /* Don't race with disconnect */ | |
541 | if (xprt_connected(xprt)) { | |
542 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
5e3771ce | 543 | ret = -EAGAIN; |
b6ddf64f TM |
544 | /* |
545 | * Notify TCP that we're limited by the application | |
546 | * window size | |
547 | */ | |
548 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
549 | transport->inet->sk_write_pending++; | |
550 | /* ...and wait for more buffer space */ | |
551 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
552 | } | |
553 | } else { | |
554 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 555 | ret = -ENOTCONN; |
b6ddf64f | 556 | } |
262965f5 | 557 | |
b6ddf64f | 558 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 559 | return ret; |
262965f5 CL |
560 | } |
561 | ||
562 | /** | |
563 | * xs_udp_send_request - write an RPC request to a UDP socket | |
564 | * @task: address of RPC task that manages the state of an RPC request | |
565 | * | |
566 | * Return values: | |
567 | * 0: The request has been sent | |
568 | * EAGAIN: The socket was blocked, please call again later to | |
569 | * complete the request | |
570 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
571 | * other: Some other error occured, the request was not sent | |
572 | */ | |
573 | static int xs_udp_send_request(struct rpc_task *task) | |
574 | { | |
575 | struct rpc_rqst *req = task->tk_rqstp; | |
576 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 577 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
578 | struct xdr_buf *xdr = &req->rq_snd_buf; |
579 | int status; | |
a246b010 | 580 | |
9903cd1c | 581 | xs_pktdump("packet data:", |
a246b010 CL |
582 | req->rq_svec->iov_base, |
583 | req->rq_svec->iov_len); | |
584 | ||
01d37c42 TM |
585 | if (!xprt_bound(xprt)) |
586 | return -ENOTCONN; | |
ee0ac0c2 | 587 | status = xs_sendpages(transport->sock, |
95392c59 | 588 | xs_addr(xprt), |
ee0ac0c2 CL |
589 | xprt->addrlen, xdr, |
590 | req->rq_bytes_sent); | |
a246b010 | 591 | |
46121cf7 | 592 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 593 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 594 | |
2199700f TM |
595 | if (status >= 0) { |
596 | task->tk_bytes_sent += status; | |
597 | if (status >= req->rq_slen) | |
598 | return 0; | |
599 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 600 | status = -EAGAIN; |
2199700f | 601 | } |
c8485e4d TM |
602 | if (!transport->sock) |
603 | goto out; | |
a246b010 | 604 | |
262965f5 | 605 | switch (status) { |
fba91afb TM |
606 | case -ENOTSOCK: |
607 | status = -ENOTCONN; | |
608 | /* Should we call xs_close() here? */ | |
609 | break; | |
b6ddf64f | 610 | case -EAGAIN: |
5e3771ce | 611 | status = xs_nospace(task); |
b6ddf64f | 612 | break; |
c8485e4d TM |
613 | default: |
614 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
615 | -status); | |
262965f5 CL |
616 | case -ENETUNREACH: |
617 | case -EPIPE: | |
a246b010 CL |
618 | case -ECONNREFUSED: |
619 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 620 | * prompts ECONNREFUSED. */ |
b6ddf64f | 621 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 622 | } |
c8485e4d | 623 | out: |
262965f5 | 624 | return status; |
a246b010 CL |
625 | } |
626 | ||
e06799f9 TM |
627 | /** |
628 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
629 | * @xprt: transport | |
630 | * | |
631 | * Initiates a graceful shutdown of the TCP socket by calling the | |
632 | * equivalent of shutdown(SHUT_WR); | |
633 | */ | |
634 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
635 | { | |
636 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
637 | struct socket *sock = transport->sock; | |
638 | ||
639 | if (sock != NULL) | |
640 | kernel_sock_shutdown(sock, SHUT_WR); | |
641 | } | |
642 | ||
808012fb CL |
643 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
644 | { | |
645 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
646 | rpc_fraghdr *base = buf->head[0].iov_base; | |
647 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
648 | } | |
649 | ||
9903cd1c | 650 | /** |
262965f5 | 651 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
652 | * @task: address of RPC task that manages the state of an RPC request |
653 | * | |
654 | * Return values: | |
262965f5 CL |
655 | * 0: The request has been sent |
656 | * EAGAIN: The socket was blocked, please call again later to | |
657 | * complete the request | |
658 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
659 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
660 | * |
661 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 662 | * if sendmsg is not able to make progress? |
9903cd1c | 663 | */ |
262965f5 | 664 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
665 | { |
666 | struct rpc_rqst *req = task->tk_rqstp; | |
667 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 668 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 669 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 670 | int status; |
a246b010 | 671 | |
808012fb | 672 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 673 | |
262965f5 CL |
674 | xs_pktdump("packet data:", |
675 | req->rq_svec->iov_base, | |
676 | req->rq_svec->iov_len); | |
a246b010 CL |
677 | |
678 | /* Continue transmitting the packet/record. We must be careful | |
679 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 680 | * called sendmsg(). */ |
a246b010 | 681 | while (1) { |
ee0ac0c2 CL |
682 | status = xs_sendpages(transport->sock, |
683 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 684 | |
46121cf7 | 685 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 686 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 687 | |
262965f5 | 688 | if (unlikely(status < 0)) |
a246b010 | 689 | break; |
a246b010 | 690 | |
262965f5 CL |
691 | /* If we've sent the entire packet, immediately |
692 | * reset the count of bytes sent. */ | |
693 | req->rq_bytes_sent += status; | |
ef759a2e | 694 | task->tk_bytes_sent += status; |
262965f5 CL |
695 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
696 | req->rq_bytes_sent = 0; | |
697 | return 0; | |
698 | } | |
a246b010 | 699 | |
06b4b681 TM |
700 | if (status != 0) |
701 | continue; | |
a246b010 | 702 | status = -EAGAIN; |
06b4b681 | 703 | break; |
a246b010 | 704 | } |
c8485e4d TM |
705 | if (!transport->sock) |
706 | goto out; | |
a246b010 | 707 | |
262965f5 | 708 | switch (status) { |
fba91afb TM |
709 | case -ENOTSOCK: |
710 | status = -ENOTCONN; | |
711 | /* Should we call xs_close() here? */ | |
712 | break; | |
262965f5 | 713 | case -EAGAIN: |
5e3771ce | 714 | status = xs_nospace(task); |
262965f5 | 715 | break; |
c8485e4d TM |
716 | default: |
717 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
718 | -status); | |
262965f5 | 719 | case -ECONNRESET: |
2a9e1cfa TM |
720 | xs_tcp_shutdown(xprt); |
721 | case -ECONNREFUSED: | |
262965f5 CL |
722 | case -ENOTCONN: |
723 | case -EPIPE: | |
b6ddf64f | 724 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 725 | } |
c8485e4d | 726 | out: |
a246b010 CL |
727 | return status; |
728 | } | |
729 | ||
e0ab53de TM |
730 | /** |
731 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
732 | * @xprt: transport | |
733 | * @task: rpc task | |
734 | * | |
735 | * This cleans up if an error causes us to abort the transmission of a request. | |
736 | * In this case, the socket may need to be reset in order to avoid confusing | |
737 | * the server. | |
738 | */ | |
739 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
740 | { | |
741 | struct rpc_rqst *req; | |
742 | ||
743 | if (task != xprt->snd_task) | |
744 | return; | |
745 | if (task == NULL) | |
746 | goto out_release; | |
747 | req = task->tk_rqstp; | |
748 | if (req->rq_bytes_sent == 0) | |
749 | goto out_release; | |
750 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
751 | goto out_release; | |
752 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
753 | out_release: | |
754 | xprt_release_xprt(xprt, task); | |
755 | } | |
756 | ||
2a9e1cfa TM |
757 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
758 | { | |
759 | transport->old_data_ready = sk->sk_data_ready; | |
760 | transport->old_state_change = sk->sk_state_change; | |
761 | transport->old_write_space = sk->sk_write_space; | |
762 | transport->old_error_report = sk->sk_error_report; | |
763 | } | |
764 | ||
765 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
766 | { | |
767 | sk->sk_data_ready = transport->old_data_ready; | |
768 | sk->sk_state_change = transport->old_state_change; | |
769 | sk->sk_write_space = transport->old_write_space; | |
770 | sk->sk_error_report = transport->old_error_report; | |
771 | } | |
772 | ||
fe315e76 | 773 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 774 | { |
ee0ac0c2 CL |
775 | struct socket *sock = transport->sock; |
776 | struct sock *sk = transport->inet; | |
a246b010 | 777 | |
fe315e76 CL |
778 | if (sk == NULL) |
779 | return; | |
9903cd1c | 780 | |
a246b010 | 781 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
782 | transport->inet = NULL; |
783 | transport->sock = NULL; | |
a246b010 | 784 | |
9903cd1c | 785 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
786 | |
787 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
788 | write_unlock_bh(&sk->sk_callback_lock); |
789 | ||
9903cd1c | 790 | sk->sk_no_check = 0; |
a246b010 CL |
791 | |
792 | sock_release(sock); | |
fe315e76 CL |
793 | } |
794 | ||
795 | /** | |
796 | * xs_close - close a socket | |
797 | * @xprt: transport | |
798 | * | |
799 | * This is used when all requests are complete; ie, no DRC state remains | |
800 | * on the server we want to save. | |
801 | */ | |
802 | static void xs_close(struct rpc_xprt *xprt) | |
803 | { | |
804 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
805 | ||
806 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
807 | ||
808 | xs_reset_transport(transport); | |
809 | ||
632e3bdc | 810 | smp_mb__before_clear_bit(); |
7d1e8255 | 811 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 812 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 813 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 814 | smp_mb__after_clear_bit(); |
62da3b24 | 815 | xprt_disconnect_done(xprt); |
a246b010 CL |
816 | } |
817 | ||
9903cd1c CL |
818 | /** |
819 | * xs_destroy - prepare to shutdown a transport | |
820 | * @xprt: doomed transport | |
821 | * | |
822 | */ | |
823 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 824 | { |
c8475461 CL |
825 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
826 | ||
46121cf7 | 827 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 828 | |
c1384c9c | 829 | cancel_rearming_delayed_work(&transport->connect_worker); |
a246b010 | 830 | |
9903cd1c | 831 | xs_close(xprt); |
edb267a6 | 832 | xs_free_peer_addresses(xprt); |
a246b010 | 833 | kfree(xprt->slot); |
c8541ecd | 834 | kfree(xprt); |
bc25571e | 835 | module_put(THIS_MODULE); |
a246b010 CL |
836 | } |
837 | ||
9903cd1c CL |
838 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
839 | { | |
840 | return (struct rpc_xprt *) sk->sk_user_data; | |
841 | } | |
842 | ||
843 | /** | |
844 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
845 | * @sk: socket with data to read | |
846 | * @len: how much data to read | |
847 | * | |
a246b010 | 848 | */ |
9903cd1c | 849 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 850 | { |
9903cd1c CL |
851 | struct rpc_task *task; |
852 | struct rpc_xprt *xprt; | |
a246b010 | 853 | struct rpc_rqst *rovr; |
9903cd1c | 854 | struct sk_buff *skb; |
a246b010 | 855 | int err, repsize, copied; |
d8ed029d AD |
856 | u32 _xid; |
857 | __be32 *xp; | |
a246b010 CL |
858 | |
859 | read_lock(&sk->sk_callback_lock); | |
46121cf7 | 860 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 861 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 862 | goto out; |
a246b010 CL |
863 | |
864 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
865 | goto out; | |
866 | ||
867 | if (xprt->shutdown) | |
868 | goto dropit; | |
869 | ||
870 | repsize = skb->len - sizeof(struct udphdr); | |
871 | if (repsize < 4) { | |
46121cf7 | 872 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
873 | goto dropit; |
874 | } | |
875 | ||
876 | /* Copy the XID from the skb... */ | |
877 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
878 | sizeof(_xid), &_xid); | |
879 | if (xp == NULL) | |
880 | goto dropit; | |
881 | ||
882 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 883 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
884 | rovr = xprt_lookup_rqst(xprt, *xp); |
885 | if (!rovr) | |
886 | goto out_unlock; | |
887 | task = rovr->rq_task; | |
888 | ||
a246b010 CL |
889 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
890 | copied = repsize; | |
891 | ||
892 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
893 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
894 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 895 | goto out_unlock; |
1781f7f5 HX |
896 | } |
897 | ||
898 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 CL |
899 | |
900 | /* Something worked... */ | |
901 | dst_confirm(skb->dst); | |
902 | ||
1570c1e4 CL |
903 | xprt_adjust_cwnd(task, copied); |
904 | xprt_update_rtt(task); | |
905 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
906 | |
907 | out_unlock: | |
4a0f8c04 | 908 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
909 | dropit: |
910 | skb_free_datagram(sk, skb); | |
911 | out: | |
912 | read_unlock(&sk->sk_callback_lock); | |
913 | } | |
914 | ||
dd456471 | 915 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 916 | { |
51971139 | 917 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
918 | size_t len, used; |
919 | char *p; | |
920 | ||
51971139 CL |
921 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
922 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 923 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 924 | transport->tcp_offset += used; |
a246b010 CL |
925 | if (used != len) |
926 | return; | |
808012fb | 927 | |
51971139 CL |
928 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
929 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 930 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 931 | else |
e136d092 | 932 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 933 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 934 | |
e136d092 | 935 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 936 | transport->tcp_offset = 0; |
808012fb | 937 | |
a246b010 | 938 | /* Sanity check of the record length */ |
51971139 | 939 | if (unlikely(transport->tcp_reclen < 4)) { |
46121cf7 | 940 | dprintk("RPC: invalid TCP record fragment length\n"); |
3ebb067d | 941 | xprt_force_disconnect(xprt); |
9903cd1c | 942 | return; |
a246b010 | 943 | } |
46121cf7 | 944 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 945 | transport->tcp_reclen); |
a246b010 CL |
946 | } |
947 | ||
51971139 | 948 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 949 | { |
51971139 | 950 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 951 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 952 | transport->tcp_offset = 0; |
e136d092 CL |
953 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
954 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
955 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 956 | transport->tcp_copied = 0; |
a246b010 CL |
957 | } |
958 | } | |
959 | } | |
960 | ||
dd456471 | 961 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
962 | { |
963 | size_t len, used; | |
964 | char *p; | |
965 | ||
51971139 | 966 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 967 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 968 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 969 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 970 | transport->tcp_offset += used; |
a246b010 CL |
971 | if (used != len) |
972 | return; | |
e136d092 CL |
973 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
974 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
51971139 | 975 | transport->tcp_copied = 4; |
46121cf7 | 976 | dprintk("RPC: reading reply for XID %08x\n", |
51971139 CL |
977 | ntohl(transport->tcp_xid)); |
978 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
979 | } |
980 | ||
dd456471 | 981 | static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 982 | { |
51971139 | 983 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
984 | struct rpc_rqst *req; |
985 | struct xdr_buf *rcvbuf; | |
986 | size_t len; | |
987 | ssize_t r; | |
988 | ||
989 | /* Find and lock the request corresponding to this xid */ | |
4a0f8c04 | 990 | spin_lock(&xprt->transport_lock); |
51971139 | 991 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
a246b010 | 992 | if (!req) { |
e136d092 | 993 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 994 | dprintk("RPC: XID %08x request not found!\n", |
51971139 | 995 | ntohl(transport->tcp_xid)); |
4a0f8c04 | 996 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
997 | return; |
998 | } | |
999 | ||
1000 | rcvbuf = &req->rq_private_buf; | |
1001 | len = desc->count; | |
51971139 | 1002 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1003 | struct xdr_skb_reader my_desc; |
a246b010 | 1004 | |
51971139 | 1005 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1006 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1007 | my_desc.count = len; | |
51971139 | 1008 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1009 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1010 | desc->count -= r; |
1011 | desc->offset += r; | |
1012 | } else | |
51971139 | 1013 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1014 | desc, xdr_skb_read_bits); |
a246b010 CL |
1015 | |
1016 | if (r > 0) { | |
51971139 CL |
1017 | transport->tcp_copied += r; |
1018 | transport->tcp_offset += r; | |
a246b010 CL |
1019 | } |
1020 | if (r != len) { | |
1021 | /* Error when copying to the receive buffer, | |
1022 | * usually because we weren't able to allocate | |
1023 | * additional buffer pages. All we can do now | |
e136d092 | 1024 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1025 | * will not receive any additional updates, |
1026 | * and time out. | |
1027 | * Any remaining data from this record will | |
1028 | * be discarded. | |
1029 | */ | |
e136d092 | 1030 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1031 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1032 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1033 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1034 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1035 | xprt, transport->tcp_copied, | |
1036 | transport->tcp_offset, transport->tcp_reclen); | |
a246b010 CL |
1037 | goto out; |
1038 | } | |
1039 | ||
46121cf7 | 1040 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1041 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1042 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1043 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1044 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1045 | |
1046 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1047 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1048 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1049 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1050 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 CL |
1051 | } |
1052 | ||
1053 | out: | |
e136d092 | 1054 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1055 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
4a0f8c04 | 1056 | spin_unlock(&xprt->transport_lock); |
51971139 | 1057 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1058 | } |
1059 | ||
dd456471 | 1060 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1061 | { |
1062 | size_t len; | |
1063 | ||
51971139 | 1064 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1065 | if (len > desc->count) |
1066 | len = desc->count; | |
1067 | desc->count -= len; | |
1068 | desc->offset += len; | |
51971139 | 1069 | transport->tcp_offset += len; |
46121cf7 | 1070 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1071 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1072 | } |
1073 | ||
9903cd1c | 1074 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1075 | { |
1076 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1077 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1078 | struct xdr_skb_reader desc = { |
a246b010 CL |
1079 | .skb = skb, |
1080 | .offset = offset, | |
1081 | .count = len, | |
9903cd1c | 1082 | }; |
a246b010 | 1083 | |
46121cf7 | 1084 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1085 | do { |
1086 | /* Read in a new fragment marker if necessary */ | |
1087 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1088 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1089 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1090 | continue; |
1091 | } | |
1092 | /* Read in the xid if necessary */ | |
e136d092 | 1093 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1094 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1095 | continue; |
1096 | } | |
1097 | /* Read in the request data */ | |
e136d092 | 1098 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
9903cd1c | 1099 | xs_tcp_read_request(xprt, &desc); |
a246b010 CL |
1100 | continue; |
1101 | } | |
1102 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1103 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1104 | } while (desc.count); |
46121cf7 | 1105 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1106 | return len - desc.count; |
1107 | } | |
1108 | ||
9903cd1c CL |
1109 | /** |
1110 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1111 | * @sk: socket with data to read | |
1112 | * @bytes: how much data to read | |
1113 | * | |
1114 | */ | |
1115 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1116 | { |
1117 | struct rpc_xprt *xprt; | |
1118 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1119 | int read; |
a246b010 | 1120 | |
46121cf7 CL |
1121 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1122 | ||
a246b010 | 1123 | read_lock(&sk->sk_callback_lock); |
9903cd1c | 1124 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1125 | goto out; |
a246b010 CL |
1126 | if (xprt->shutdown) |
1127 | goto out; | |
1128 | ||
9903cd1c | 1129 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1130 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1131 | do { |
1132 | rd_desc.count = 65536; | |
1133 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1134 | } while (read > 0); | |
a246b010 CL |
1135 | out: |
1136 | read_unlock(&sk->sk_callback_lock); | |
1137 | } | |
1138 | ||
7d1e8255 TM |
1139 | /* |
1140 | * Do the equivalent of linger/linger2 handling for dealing with | |
1141 | * broken servers that don't close the socket in a timely | |
1142 | * fashion | |
1143 | */ | |
1144 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1145 | unsigned long timeout) | |
1146 | { | |
1147 | struct sock_xprt *transport; | |
1148 | ||
1149 | if (xprt_test_and_set_connecting(xprt)) | |
1150 | return; | |
1151 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1152 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1153 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1154 | timeout); | |
1155 | } | |
1156 | ||
1157 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1158 | { | |
1159 | struct sock_xprt *transport; | |
1160 | ||
1161 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1162 | ||
1163 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1164 | !cancel_delayed_work(&transport->connect_worker)) | |
1165 | return; | |
1166 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1167 | xprt_clear_connecting(xprt); | |
1168 | } | |
1169 | ||
1170 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1171 | { | |
1172 | smp_mb__before_clear_bit(); | |
1173 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1174 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1175 | smp_mb__after_clear_bit(); | |
1176 | /* Mark transport as closed and wake up all pending tasks */ | |
1177 | xprt_disconnect_done(xprt); | |
1178 | } | |
1179 | ||
9903cd1c CL |
1180 | /** |
1181 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1182 | * @sk: socket whose state has changed | |
1183 | * | |
1184 | */ | |
1185 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1186 | { |
9903cd1c | 1187 | struct rpc_xprt *xprt; |
a246b010 CL |
1188 | |
1189 | read_lock(&sk->sk_callback_lock); | |
1190 | if (!(xprt = xprt_from_sock(sk))) | |
1191 | goto out; | |
46121cf7 CL |
1192 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1193 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", | |
1194 | sk->sk_state, xprt_connected(xprt), | |
1195 | sock_flag(sk, SOCK_DEAD), | |
1196 | sock_flag(sk, SOCK_ZAPPED)); | |
a246b010 CL |
1197 | |
1198 | switch (sk->sk_state) { | |
1199 | case TCP_ESTABLISHED: | |
4a0f8c04 | 1200 | spin_lock_bh(&xprt->transport_lock); |
a246b010 | 1201 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1202 | struct sock_xprt *transport = container_of(xprt, |
1203 | struct sock_xprt, xprt); | |
1204 | ||
a246b010 | 1205 | /* Reset TCP record info */ |
51971139 CL |
1206 | transport->tcp_offset = 0; |
1207 | transport->tcp_reclen = 0; | |
1208 | transport->tcp_copied = 0; | |
e136d092 CL |
1209 | transport->tcp_flags = |
1210 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1211 | |
2a491991 | 1212 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1213 | } |
4a0f8c04 | 1214 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 | 1215 | break; |
3b948ae5 TM |
1216 | case TCP_FIN_WAIT1: |
1217 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1218 | xprt->connect_cookie++; |
663b8858 | 1219 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1220 | set_bit(XPRT_CLOSING, &xprt->state); |
1221 | smp_mb__before_clear_bit(); | |
1222 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1223 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1224 | smp_mb__after_clear_bit(); |
7d1e8255 | 1225 | xs_tcp_schedule_linger_timeout(xprt, XS_TCP_LINGER_TO); |
a246b010 | 1226 | break; |
632e3bdc | 1227 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1228 | /* The server initiated a shutdown of the socket */ |
66af1e55 | 1229 | xprt_force_disconnect(xprt); |
663b8858 | 1230 | case TCP_SYN_SENT: |
7c1d71cf | 1231 | xprt->connect_cookie++; |
663b8858 TM |
1232 | case TCP_CLOSING: |
1233 | /* | |
1234 | * If the server closed down the connection, make sure that | |
1235 | * we back off before reconnecting | |
1236 | */ | |
1237 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1238 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1239 | break; |
1240 | case TCP_LAST_ACK: | |
670f9457 | 1241 | set_bit(XPRT_CLOSING, &xprt->state); |
7d1e8255 | 1242 | xs_tcp_schedule_linger_timeout(xprt, XS_TCP_LINGER_TO); |
3b948ae5 TM |
1243 | smp_mb__before_clear_bit(); |
1244 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1245 | smp_mb__after_clear_bit(); | |
1246 | break; | |
1247 | case TCP_CLOSE: | |
7d1e8255 TM |
1248 | xs_tcp_cancel_linger_timeout(xprt); |
1249 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1250 | } |
1251 | out: | |
1252 | read_unlock(&sk->sk_callback_lock); | |
1253 | } | |
1254 | ||
2a9e1cfa | 1255 | /** |
482f32e6 | 1256 | * xs_error_report - callback mainly for catching socket errors |
2a9e1cfa TM |
1257 | * @sk: socket |
1258 | */ | |
482f32e6 | 1259 | static void xs_error_report(struct sock *sk) |
2a9e1cfa TM |
1260 | { |
1261 | struct rpc_xprt *xprt; | |
1262 | ||
1263 | read_lock(&sk->sk_callback_lock); | |
2a9e1cfa TM |
1264 | if (!(xprt = xprt_from_sock(sk))) |
1265 | goto out; | |
1266 | dprintk("RPC: %s client %p...\n" | |
1267 | "RPC: error %d\n", | |
1268 | __func__, xprt, sk->sk_err); | |
482f32e6 | 1269 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
2a9e1cfa TM |
1270 | out: |
1271 | read_unlock(&sk->sk_callback_lock); | |
1272 | } | |
1273 | ||
9903cd1c | 1274 | /** |
c7b2cae8 CL |
1275 | * xs_udp_write_space - callback invoked when socket buffer space |
1276 | * becomes available | |
9903cd1c CL |
1277 | * @sk: socket whose state has changed |
1278 | * | |
a246b010 CL |
1279 | * Called when more output buffer space is available for this socket. |
1280 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1281 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1282 | * with a bunch of small requests. |
1283 | */ | |
c7b2cae8 | 1284 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1285 | { |
a246b010 | 1286 | read_lock(&sk->sk_callback_lock); |
a246b010 | 1287 | |
c7b2cae8 CL |
1288 | /* from net/core/sock.c:sock_def_write_space */ |
1289 | if (sock_writeable(sk)) { | |
1290 | struct socket *sock; | |
1291 | struct rpc_xprt *xprt; | |
1292 | ||
1293 | if (unlikely(!(sock = sk->sk_socket))) | |
a246b010 | 1294 | goto out; |
b6ddf64f TM |
1295 | clear_bit(SOCK_NOSPACE, &sock->flags); |
1296 | ||
c7b2cae8 CL |
1297 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
1298 | goto out; | |
b6ddf64f | 1299 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) |
a246b010 | 1300 | goto out; |
c7b2cae8 CL |
1301 | |
1302 | xprt_write_space(xprt); | |
a246b010 CL |
1303 | } |
1304 | ||
c7b2cae8 CL |
1305 | out: |
1306 | read_unlock(&sk->sk_callback_lock); | |
1307 | } | |
a246b010 | 1308 | |
c7b2cae8 CL |
1309 | /** |
1310 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1311 | * becomes available | |
1312 | * @sk: socket whose state has changed | |
1313 | * | |
1314 | * Called when more output buffer space is available for this socket. | |
1315 | * We try not to wake our writers until they can make "significant" | |
1316 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1317 | * with a bunch of small requests. | |
1318 | */ | |
1319 | static void xs_tcp_write_space(struct sock *sk) | |
1320 | { | |
1321 | read_lock(&sk->sk_callback_lock); | |
1322 | ||
1323 | /* from net/core/stream.c:sk_stream_write_space */ | |
1324 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
1325 | struct socket *sock; | |
1326 | struct rpc_xprt *xprt; | |
1327 | ||
1328 | if (unlikely(!(sock = sk->sk_socket))) | |
1329 | goto out; | |
b6ddf64f TM |
1330 | clear_bit(SOCK_NOSPACE, &sock->flags); |
1331 | ||
c7b2cae8 CL |
1332 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
1333 | goto out; | |
b6ddf64f | 1334 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) |
c7b2cae8 CL |
1335 | goto out; |
1336 | ||
1337 | xprt_write_space(xprt); | |
1338 | } | |
1339 | ||
1340 | out: | |
a246b010 CL |
1341 | read_unlock(&sk->sk_callback_lock); |
1342 | } | |
1343 | ||
470056c2 | 1344 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1345 | { |
ee0ac0c2 CL |
1346 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1347 | struct sock *sk = transport->inet; | |
a246b010 | 1348 | |
7c6e066e | 1349 | if (transport->rcvsize) { |
a246b010 | 1350 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1351 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1352 | } |
7c6e066e | 1353 | if (transport->sndsize) { |
a246b010 | 1354 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1355 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1356 | sk->sk_write_space(sk); |
1357 | } | |
1358 | } | |
1359 | ||
43118c29 | 1360 | /** |
470056c2 | 1361 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1362 | * @xprt: generic transport |
470056c2 CL |
1363 | * @sndsize: requested size of send buffer, in bytes |
1364 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1365 | * |
470056c2 | 1366 | * Set socket send and receive buffer size limits. |
43118c29 | 1367 | */ |
470056c2 | 1368 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1369 | { |
7c6e066e CL |
1370 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1371 | ||
1372 | transport->sndsize = 0; | |
470056c2 | 1373 | if (sndsize) |
7c6e066e CL |
1374 | transport->sndsize = sndsize + 1024; |
1375 | transport->rcvsize = 0; | |
470056c2 | 1376 | if (rcvsize) |
7c6e066e | 1377 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1378 | |
1379 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1380 | } |
1381 | ||
46c0ee8b CL |
1382 | /** |
1383 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1384 | * @task: task that timed out | |
1385 | * | |
1386 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1387 | */ | |
1388 | static void xs_udp_timer(struct rpc_task *task) | |
1389 | { | |
1390 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1391 | } | |
1392 | ||
b85d8806 CL |
1393 | static unsigned short xs_get_random_port(void) |
1394 | { | |
1395 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1396 | unsigned short rand = (unsigned short) net_random() % range; | |
1397 | return rand + xprt_min_resvport; | |
1398 | } | |
1399 | ||
92200412 CL |
1400 | /** |
1401 | * xs_set_port - reset the port number in the remote endpoint address | |
1402 | * @xprt: generic transport | |
1403 | * @port: new port number | |
1404 | * | |
1405 | */ | |
1406 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1407 | { | |
95392c59 | 1408 | struct sockaddr *addr = xs_addr(xprt); |
c4efcb1d | 1409 | |
46121cf7 | 1410 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1411 | |
20612005 CL |
1412 | switch (addr->sa_family) { |
1413 | case AF_INET: | |
1414 | ((struct sockaddr_in *)addr)->sin_port = htons(port); | |
1415 | break; | |
1416 | case AF_INET6: | |
1417 | ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); | |
1418 | break; | |
1419 | default: | |
1420 | BUG(); | |
1421 | } | |
92200412 CL |
1422 | } |
1423 | ||
67a391d7 TM |
1424 | static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) |
1425 | { | |
1426 | unsigned short port = transport->port; | |
1427 | ||
1428 | if (port == 0 && transport->xprt.resvport) | |
1429 | port = xs_get_random_port(); | |
1430 | return port; | |
1431 | } | |
1432 | ||
1433 | static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) | |
1434 | { | |
1435 | if (transport->port != 0) | |
1436 | transport->port = 0; | |
1437 | if (!transport->xprt.resvport) | |
1438 | return 0; | |
1439 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1440 | return xprt_max_resvport; | |
1441 | return --port; | |
1442 | } | |
1443 | ||
7dc753f0 | 1444 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
a246b010 CL |
1445 | { |
1446 | struct sockaddr_in myaddr = { | |
1447 | .sin_family = AF_INET, | |
1448 | }; | |
d3bc9a1d | 1449 | struct sockaddr_in *sa; |
67a391d7 TM |
1450 | int err, nloop = 0; |
1451 | unsigned short port = xs_get_srcport(transport, sock); | |
1452 | unsigned short last; | |
a246b010 | 1453 | |
d3bc9a1d FM |
1454 | sa = (struct sockaddr_in *)&transport->addr; |
1455 | myaddr.sin_addr = sa->sin_addr; | |
a246b010 CL |
1456 | do { |
1457 | myaddr.sin_port = htons(port); | |
e6242e92 | 1458 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 | 1459 | sizeof(myaddr)); |
67a391d7 | 1460 | if (port == 0) |
d3bc9a1d | 1461 | break; |
a246b010 | 1462 | if (err == 0) { |
c8475461 | 1463 | transport->port = port; |
d3bc9a1d | 1464 | break; |
a246b010 | 1465 | } |
67a391d7 TM |
1466 | last = port; |
1467 | port = xs_next_srcport(transport, sock, port); | |
1468 | if (port > last) | |
1469 | nloop++; | |
1470 | } while (err == -EADDRINUSE && nloop != 2); | |
21454aaa HH |
1471 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", |
1472 | __func__, &myaddr.sin_addr, | |
7dc753f0 | 1473 | port, err ? "failed" : "ok", err); |
a246b010 CL |
1474 | return err; |
1475 | } | |
1476 | ||
90058d37 CL |
1477 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1478 | { | |
1479 | struct sockaddr_in6 myaddr = { | |
1480 | .sin6_family = AF_INET6, | |
1481 | }; | |
1482 | struct sockaddr_in6 *sa; | |
67a391d7 TM |
1483 | int err, nloop = 0; |
1484 | unsigned short port = xs_get_srcport(transport, sock); | |
1485 | unsigned short last; | |
90058d37 | 1486 | |
90058d37 CL |
1487 | sa = (struct sockaddr_in6 *)&transport->addr; |
1488 | myaddr.sin6_addr = sa->sin6_addr; | |
1489 | do { | |
1490 | myaddr.sin6_port = htons(port); | |
1491 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, | |
1492 | sizeof(myaddr)); | |
67a391d7 | 1493 | if (port == 0) |
90058d37 CL |
1494 | break; |
1495 | if (err == 0) { | |
1496 | transport->port = port; | |
1497 | break; | |
1498 | } | |
67a391d7 TM |
1499 | last = port; |
1500 | port = xs_next_srcport(transport, sock, port); | |
1501 | if (port > last) | |
1502 | nloop++; | |
1503 | } while (err == -EADDRINUSE && nloop != 2); | |
5b095d98 | 1504 | dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", |
fdb46ee7 | 1505 | &myaddr.sin6_addr, port, err ? "failed" : "ok", err); |
a246b010 CL |
1506 | return err; |
1507 | } | |
1508 | ||
ed07536e PZ |
1509 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1510 | static struct lock_class_key xs_key[2]; | |
1511 | static struct lock_class_key xs_slock_key[2]; | |
1512 | ||
8945ee5e | 1513 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1514 | { |
1515 | struct sock *sk = sock->sk; | |
8945ee5e | 1516 | |
02b3d346 | 1517 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1518 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1519 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1520 | } | |
ed07536e | 1521 | |
8945ee5e CL |
1522 | static inline void xs_reclassify_socket6(struct socket *sock) |
1523 | { | |
1524 | struct sock *sk = sock->sk; | |
ed07536e | 1525 | |
f4921aff | 1526 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1527 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1528 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e PZ |
1529 | } |
1530 | #else | |
8945ee5e CL |
1531 | static inline void xs_reclassify_socket4(struct socket *sock) |
1532 | { | |
1533 | } | |
1534 | ||
1535 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1536 | { |
1537 | } | |
1538 | #endif | |
1539 | ||
16be2d20 CL |
1540 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1541 | { | |
1542 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1543 | ||
1544 | if (!transport->inet) { | |
1545 | struct sock *sk = sock->sk; | |
1546 | ||
1547 | write_lock_bh(&sk->sk_callback_lock); | |
1548 | ||
2a9e1cfa TM |
1549 | xs_save_old_callbacks(transport, sk); |
1550 | ||
16be2d20 | 1551 | sk->sk_user_data = xprt; |
16be2d20 CL |
1552 | sk->sk_data_ready = xs_udp_data_ready; |
1553 | sk->sk_write_space = xs_udp_write_space; | |
482f32e6 | 1554 | sk->sk_error_report = xs_error_report; |
16be2d20 CL |
1555 | sk->sk_no_check = UDP_CSUM_NORCV; |
1556 | sk->sk_allocation = GFP_ATOMIC; | |
1557 | ||
1558 | xprt_set_connected(xprt); | |
1559 | ||
1560 | /* Reset to new socket */ | |
1561 | transport->sock = sock; | |
1562 | transport->inet = sk; | |
1563 | ||
1564 | write_unlock_bh(&sk->sk_callback_lock); | |
1565 | } | |
1566 | xs_udp_do_set_buffer_size(xprt); | |
1567 | } | |
1568 | ||
b0d93ad5 | 1569 | /** |
9c3d72de | 1570 | * xs_udp_connect_worker4 - set up a UDP socket |
65f27f38 | 1571 | * @work: RPC transport to connect |
b0d93ad5 CL |
1572 | * |
1573 | * Invoked by a work queue tasklet. | |
1574 | */ | |
9c3d72de | 1575 | static void xs_udp_connect_worker4(struct work_struct *work) |
a246b010 | 1576 | { |
34161db6 TM |
1577 | struct sock_xprt *transport = |
1578 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1579 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1580 | struct socket *sock = transport->sock; |
b0d93ad5 | 1581 | int err, status = -EIO; |
9903cd1c | 1582 | |
01d37c42 | 1583 | if (xprt->shutdown) |
b0d93ad5 | 1584 | goto out; |
9903cd1c | 1585 | |
b0d93ad5 | 1586 | /* Start by resetting any existing state */ |
fe315e76 | 1587 | xs_reset_transport(transport); |
9903cd1c | 1588 | |
fe315e76 CL |
1589 | err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1590 | if (err < 0) { | |
46121cf7 | 1591 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
b0d93ad5 CL |
1592 | goto out; |
1593 | } | |
8945ee5e | 1594 | xs_reclassify_socket4(sock); |
9903cd1c | 1595 | |
7dc753f0 | 1596 | if (xs_bind4(transport, sock)) { |
b0d93ad5 CL |
1597 | sock_release(sock); |
1598 | goto out; | |
1599 | } | |
9903cd1c | 1600 | |
46121cf7 | 1601 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
7559c7a2 | 1602 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1603 | |
16be2d20 | 1604 | xs_udp_finish_connecting(xprt, sock); |
b0d93ad5 CL |
1605 | status = 0; |
1606 | out: | |
b0d93ad5 | 1607 | xprt_clear_connecting(xprt); |
7d1e8255 | 1608 | xprt_wake_pending_tasks(xprt, status); |
a246b010 | 1609 | } |
a246b010 | 1610 | |
68e220bd CL |
1611 | /** |
1612 | * xs_udp_connect_worker6 - set up a UDP socket | |
1613 | * @work: RPC transport to connect | |
1614 | * | |
1615 | * Invoked by a work queue tasklet. | |
1616 | */ | |
1617 | static void xs_udp_connect_worker6(struct work_struct *work) | |
1618 | { | |
1619 | struct sock_xprt *transport = | |
1620 | container_of(work, struct sock_xprt, connect_worker.work); | |
1621 | struct rpc_xprt *xprt = &transport->xprt; | |
1622 | struct socket *sock = transport->sock; | |
1623 | int err, status = -EIO; | |
a246b010 | 1624 | |
01d37c42 | 1625 | if (xprt->shutdown) |
68e220bd | 1626 | goto out; |
b0d93ad5 | 1627 | |
68e220bd | 1628 | /* Start by resetting any existing state */ |
fe315e76 | 1629 | xs_reset_transport(transport); |
a246b010 | 1630 | |
fe315e76 CL |
1631 | err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1632 | if (err < 0) { | |
68e220bd CL |
1633 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1634 | goto out; | |
1635 | } | |
8945ee5e | 1636 | xs_reclassify_socket6(sock); |
a246b010 | 1637 | |
68e220bd CL |
1638 | if (xs_bind6(transport, sock) < 0) { |
1639 | sock_release(sock); | |
1640 | goto out; | |
b0d93ad5 | 1641 | } |
68e220bd CL |
1642 | |
1643 | dprintk("RPC: worker connecting xprt %p to address: %s\n", | |
1644 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); | |
1645 | ||
1646 | xs_udp_finish_connecting(xprt, sock); | |
b0d93ad5 CL |
1647 | status = 0; |
1648 | out: | |
b0d93ad5 | 1649 | xprt_clear_connecting(xprt); |
7d1e8255 | 1650 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
1651 | } |
1652 | ||
3167e12c CL |
1653 | /* |
1654 | * We need to preserve the port number so the reply cache on the server can | |
1655 | * find our cached RPC replies when we get around to reconnecting. | |
1656 | */ | |
40d2549d | 1657 | static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
3167e12c CL |
1658 | { |
1659 | int result; | |
3167e12c CL |
1660 | struct sockaddr any; |
1661 | ||
46121cf7 | 1662 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
3167e12c CL |
1663 | |
1664 | /* | |
1665 | * Disconnect the transport socket by doing a connect operation | |
1666 | * with AF_UNSPEC. This should return immediately... | |
1667 | */ | |
1668 | memset(&any, 0, sizeof(any)); | |
1669 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1670 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
7d1e8255 TM |
1671 | if (!result) |
1672 | xs_sock_mark_closed(xprt); | |
1673 | else | |
46121cf7 | 1674 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
1675 | result); |
1676 | } | |
1677 | ||
40d2549d TM |
1678 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1679 | { | |
1680 | unsigned int state = transport->inet->sk_state; | |
1681 | ||
1682 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) | |
1683 | return; | |
1684 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) | |
1685 | return; | |
1686 | xs_abort_connection(xprt, transport); | |
1687 | } | |
1688 | ||
16be2d20 | 1689 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 1690 | { |
16be2d20 | 1691 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
edb267a6 | 1692 | |
ee0ac0c2 | 1693 | if (!transport->inet) { |
b0d93ad5 CL |
1694 | struct sock *sk = sock->sk; |
1695 | ||
1696 | write_lock_bh(&sk->sk_callback_lock); | |
1697 | ||
2a9e1cfa TM |
1698 | xs_save_old_callbacks(transport, sk); |
1699 | ||
b0d93ad5 | 1700 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
1701 | sk->sk_data_ready = xs_tcp_data_ready; |
1702 | sk->sk_state_change = xs_tcp_state_change; | |
1703 | sk->sk_write_space = xs_tcp_write_space; | |
482f32e6 | 1704 | sk->sk_error_report = xs_error_report; |
b079fa7b | 1705 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1706 | |
1707 | /* socket options */ | |
1708 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1709 | sock_reset_flag(sk, SOCK_LINGER); | |
1710 | tcp_sk(sk)->linger2 = 0; | |
1711 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1712 | |
1713 | xprt_clear_connected(xprt); | |
1714 | ||
1715 | /* Reset to new socket */ | |
ee0ac0c2 CL |
1716 | transport->sock = sock; |
1717 | transport->inet = sk; | |
b0d93ad5 CL |
1718 | |
1719 | write_unlock_bh(&sk->sk_callback_lock); | |
1720 | } | |
1721 | ||
01d37c42 TM |
1722 | if (!xprt_bound(xprt)) |
1723 | return -ENOTCONN; | |
1724 | ||
b0d93ad5 | 1725 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
1726 | xprt->stat.connect_count++; |
1727 | xprt->stat.connect_start = jiffies; | |
95392c59 | 1728 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
16be2d20 CL |
1729 | } |
1730 | ||
9903cd1c | 1731 | /** |
9c3d72de | 1732 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
65f27f38 | 1733 | * @work: RPC transport to connect |
9903cd1c CL |
1734 | * |
1735 | * Invoked by a work queue tasklet. | |
a246b010 | 1736 | */ |
9c3d72de | 1737 | static void xs_tcp_connect_worker4(struct work_struct *work) |
a246b010 | 1738 | { |
34161db6 TM |
1739 | struct sock_xprt *transport = |
1740 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1741 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1742 | struct socket *sock = transport->sock; |
b0d93ad5 | 1743 | int err, status = -EIO; |
a246b010 | 1744 | |
01d37c42 | 1745 | if (xprt->shutdown) |
a246b010 CL |
1746 | goto out; |
1747 | ||
ee0ac0c2 | 1748 | if (!sock) { |
7d1e8255 | 1749 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
3167e12c CL |
1750 | /* start from scratch */ |
1751 | if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { | |
16be2d20 | 1752 | dprintk("RPC: can't create TCP transport socket (%d).\n", -err); |
3167e12c CL |
1753 | goto out; |
1754 | } | |
8945ee5e | 1755 | xs_reclassify_socket4(sock); |
a246b010 | 1756 | |
16be2d20 | 1757 | if (xs_bind4(transport, sock) < 0) { |
3167e12c CL |
1758 | sock_release(sock); |
1759 | goto out; | |
1760 | } | |
7d1e8255 TM |
1761 | } else { |
1762 | int abort_and_exit; | |
1763 | ||
1764 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, | |
1765 | &xprt->state); | |
3167e12c | 1766 | /* "close" the socket, preserving the local port */ |
40d2549d | 1767 | xs_tcp_reuse_connection(xprt, transport); |
a246b010 | 1768 | |
7d1e8255 TM |
1769 | if (abort_and_exit) |
1770 | goto out_eagain; | |
1771 | } | |
1772 | ||
46121cf7 | 1773 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
7559c7a2 | 1774 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1775 | |
16be2d20 | 1776 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 CL |
1777 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1778 | xprt, -status, xprt_connected(xprt), | |
1779 | sock->sk->sk_state); | |
2a491991 | 1780 | switch (status) { |
8a2cec29 TM |
1781 | case -ECONNREFUSED: |
1782 | case -ECONNRESET: | |
1783 | case -ENETUNREACH: | |
1784 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
1785 | case 0: |
1786 | case -EINPROGRESS: | |
1787 | case -EALREADY: | |
7d1e8255 TM |
1788 | xprt_clear_connecting(xprt); |
1789 | return; | |
a246b010 | 1790 | } |
8a2cec29 TM |
1791 | /* get rid of existing socket, and retry */ |
1792 | xs_tcp_shutdown(xprt); | |
1793 | printk("%s: connect returned unhandled error %d\n", | |
1794 | __func__, status); | |
7d1e8255 | 1795 | out_eagain: |
2a491991 | 1796 | status = -EAGAIN; |
a246b010 | 1797 | out: |
68e220bd | 1798 | xprt_clear_connecting(xprt); |
7d1e8255 | 1799 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 1800 | } |
b0d93ad5 | 1801 | |
68e220bd CL |
1802 | /** |
1803 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint | |
1804 | * @work: RPC transport to connect | |
1805 | * | |
1806 | * Invoked by a work queue tasklet. | |
1807 | */ | |
1808 | static void xs_tcp_connect_worker6(struct work_struct *work) | |
1809 | { | |
1810 | struct sock_xprt *transport = | |
1811 | container_of(work, struct sock_xprt, connect_worker.work); | |
1812 | struct rpc_xprt *xprt = &transport->xprt; | |
1813 | struct socket *sock = transport->sock; | |
1814 | int err, status = -EIO; | |
3167e12c | 1815 | |
01d37c42 | 1816 | if (xprt->shutdown) |
68e220bd | 1817 | goto out; |
b0d93ad5 | 1818 | |
68e220bd | 1819 | if (!sock) { |
7d1e8255 | 1820 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
68e220bd CL |
1821 | /* start from scratch */ |
1822 | if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { | |
1823 | dprintk("RPC: can't create TCP transport socket (%d).\n", -err); | |
1824 | goto out; | |
1825 | } | |
8945ee5e | 1826 | xs_reclassify_socket6(sock); |
b0d93ad5 | 1827 | |
68e220bd CL |
1828 | if (xs_bind6(transport, sock) < 0) { |
1829 | sock_release(sock); | |
1830 | goto out; | |
1831 | } | |
7d1e8255 TM |
1832 | } else { |
1833 | int abort_and_exit; | |
1834 | ||
1835 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, | |
1836 | &xprt->state); | |
68e220bd | 1837 | /* "close" the socket, preserving the local port */ |
40d2549d | 1838 | xs_tcp_reuse_connection(xprt, transport); |
b0d93ad5 | 1839 | |
7d1e8255 TM |
1840 | if (abort_and_exit) |
1841 | goto out_eagain; | |
1842 | } | |
1843 | ||
68e220bd CL |
1844 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
1845 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); | |
b0d93ad5 | 1846 | |
68e220bd | 1847 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 | 1848 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
68e220bd | 1849 | xprt, -status, xprt_connected(xprt), sock->sk->sk_state); |
2a491991 | 1850 | switch (status) { |
8a2cec29 TM |
1851 | case -ECONNREFUSED: |
1852 | case -ECONNRESET: | |
1853 | case -ENETUNREACH: | |
1854 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
1855 | case 0: |
1856 | case -EINPROGRESS: | |
1857 | case -EALREADY: | |
7d1e8255 TM |
1858 | xprt_clear_connecting(xprt); |
1859 | return; | |
a246b010 | 1860 | } |
8a2cec29 TM |
1861 | /* get rid of existing socket, and retry */ |
1862 | xs_tcp_shutdown(xprt); | |
1863 | printk("%s: connect returned unhandled error %d\n", | |
1864 | __func__, status); | |
7d1e8255 | 1865 | out_eagain: |
2a491991 | 1866 | status = -EAGAIN; |
a246b010 | 1867 | out: |
2226feb6 | 1868 | xprt_clear_connecting(xprt); |
7d1e8255 | 1869 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
1870 | } |
1871 | ||
9903cd1c CL |
1872 | /** |
1873 | * xs_connect - connect a socket to a remote endpoint | |
1874 | * @task: address of RPC task that manages state of connect request | |
1875 | * | |
1876 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
1877 | * |
1878 | * UDP socket connects are synchronous, but we use a work queue anyway | |
1879 | * to guarantee that even unprivileged user processes can set up a | |
1880 | * socket on a privileged port. | |
1881 | * | |
1882 | * If a UDP socket connect fails, the delay behavior here prevents | |
1883 | * retry floods (hard mounts). | |
9903cd1c CL |
1884 | */ |
1885 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
1886 | { |
1887 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 1888 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1889 | |
b0d93ad5 CL |
1890 | if (xprt_test_and_set_connecting(xprt)) |
1891 | return; | |
1892 | ||
ee0ac0c2 | 1893 | if (transport->sock != NULL) { |
46121cf7 CL |
1894 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
1895 | "seconds\n", | |
03bf4b70 | 1896 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
1897 | queue_delayed_work(rpciod_workqueue, |
1898 | &transport->connect_worker, | |
1899 | xprt->reestablish_timeout); | |
03bf4b70 CL |
1900 | xprt->reestablish_timeout <<= 1; |
1901 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) | |
1902 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 1903 | } else { |
46121cf7 | 1904 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
1905 | queue_delayed_work(rpciod_workqueue, |
1906 | &transport->connect_worker, 0); | |
a246b010 CL |
1907 | } |
1908 | } | |
1909 | ||
e06799f9 TM |
1910 | static void xs_tcp_connect(struct rpc_task *task) |
1911 | { | |
1912 | struct rpc_xprt *xprt = task->tk_xprt; | |
1913 | ||
e06799f9 TM |
1914 | /* Exit if we need to wait for socket shutdown to complete */ |
1915 | if (test_bit(XPRT_CLOSING, &xprt->state)) | |
1916 | return; | |
1917 | xs_connect(task); | |
1918 | } | |
1919 | ||
262ca07d CL |
1920 | /** |
1921 | * xs_udp_print_stats - display UDP socket-specifc stats | |
1922 | * @xprt: rpc_xprt struct containing statistics | |
1923 | * @seq: output file | |
1924 | * | |
1925 | */ | |
1926 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1927 | { | |
c8475461 CL |
1928 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1929 | ||
262ca07d | 1930 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
c8475461 | 1931 | transport->port, |
262ca07d CL |
1932 | xprt->stat.bind_count, |
1933 | xprt->stat.sends, | |
1934 | xprt->stat.recvs, | |
1935 | xprt->stat.bad_xids, | |
1936 | xprt->stat.req_u, | |
1937 | xprt->stat.bklog_u); | |
1938 | } | |
1939 | ||
1940 | /** | |
1941 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
1942 | * @xprt: rpc_xprt struct containing statistics | |
1943 | * @seq: output file | |
1944 | * | |
1945 | */ | |
1946 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1947 | { | |
c8475461 | 1948 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
1949 | long idle_time = 0; |
1950 | ||
1951 | if (xprt_connected(xprt)) | |
1952 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
1953 | ||
1954 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
c8475461 | 1955 | transport->port, |
262ca07d CL |
1956 | xprt->stat.bind_count, |
1957 | xprt->stat.connect_count, | |
1958 | xprt->stat.connect_time, | |
1959 | idle_time, | |
1960 | xprt->stat.sends, | |
1961 | xprt->stat.recvs, | |
1962 | xprt->stat.bad_xids, | |
1963 | xprt->stat.req_u, | |
1964 | xprt->stat.bklog_u); | |
1965 | } | |
1966 | ||
262965f5 | 1967 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 1968 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 1969 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 1970 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 1971 | .rpcbind = rpcb_getport_async, |
92200412 | 1972 | .set_port = xs_set_port, |
262965f5 | 1973 | .connect = xs_connect, |
02107148 CL |
1974 | .buf_alloc = rpc_malloc, |
1975 | .buf_free = rpc_free, | |
262965f5 | 1976 | .send_request = xs_udp_send_request, |
fe3aca29 | 1977 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 1978 | .timer = xs_udp_timer, |
a58dd398 | 1979 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
1980 | .close = xs_close, |
1981 | .destroy = xs_destroy, | |
262ca07d | 1982 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
1983 | }; |
1984 | ||
1985 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 1986 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 1987 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 1988 | .rpcbind = rpcb_getport_async, |
92200412 | 1989 | .set_port = xs_set_port, |
e06799f9 | 1990 | .connect = xs_tcp_connect, |
02107148 CL |
1991 | .buf_alloc = rpc_malloc, |
1992 | .buf_free = rpc_free, | |
262965f5 | 1993 | .send_request = xs_tcp_send_request, |
fe3aca29 | 1994 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
e06799f9 | 1995 | .close = xs_tcp_shutdown, |
9903cd1c | 1996 | .destroy = xs_destroy, |
262ca07d | 1997 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
1998 | }; |
1999 | ||
3c341b0b | 2000 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
bc25571e | 2001 | unsigned int slot_table_size) |
c8541ecd CL |
2002 | { |
2003 | struct rpc_xprt *xprt; | |
ffc2e518 | 2004 | struct sock_xprt *new; |
c8541ecd | 2005 | |
96802a09 | 2006 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2007 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2008 | return ERR_PTR(-EBADF); |
2009 | } | |
2010 | ||
ffc2e518 CL |
2011 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
2012 | if (new == NULL) { | |
46121cf7 CL |
2013 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2014 | "rpc_xprt\n"); | |
c8541ecd CL |
2015 | return ERR_PTR(-ENOMEM); |
2016 | } | |
ffc2e518 | 2017 | xprt = &new->xprt; |
c8541ecd CL |
2018 | |
2019 | xprt->max_reqs = slot_table_size; | |
2020 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); | |
2021 | if (xprt->slot == NULL) { | |
2022 | kfree(xprt); | |
46121cf7 CL |
2023 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
2024 | "table\n"); | |
c8541ecd CL |
2025 | return ERR_PTR(-ENOMEM); |
2026 | } | |
2027 | ||
96802a09 FM |
2028 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2029 | xprt->addrlen = args->addrlen; | |
d3bc9a1d FM |
2030 | if (args->srcaddr) |
2031 | memcpy(&new->addr, args->srcaddr, args->addrlen); | |
c8541ecd CL |
2032 | |
2033 | return xprt; | |
2034 | } | |
2035 | ||
2881ae74 TM |
2036 | static const struct rpc_timeout xs_udp_default_timeout = { |
2037 | .to_initval = 5 * HZ, | |
2038 | .to_maxval = 30 * HZ, | |
2039 | .to_increment = 5 * HZ, | |
2040 | .to_retries = 5, | |
2041 | }; | |
2042 | ||
9903cd1c CL |
2043 | /** |
2044 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2045 | * @args: rpc transport creation arguments |
9903cd1c CL |
2046 | * |
2047 | */ | |
483066d6 | 2048 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2049 | { |
8f9d5b1a | 2050 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2051 | struct rpc_xprt *xprt; |
c8475461 | 2052 | struct sock_xprt *transport; |
a246b010 | 2053 | |
96802a09 | 2054 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
2055 | if (IS_ERR(xprt)) |
2056 | return xprt; | |
c8475461 | 2057 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2058 | |
ec739ef0 | 2059 | xprt->prot = IPPROTO_UDP; |
808012fb | 2060 | xprt->tsh_size = 0; |
a246b010 CL |
2061 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2062 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2063 | ||
03bf4b70 CL |
2064 | xprt->bind_timeout = XS_BIND_TO; |
2065 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
2066 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
2067 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2068 | |
262965f5 | 2069 | xprt->ops = &xs_udp_ops; |
a246b010 | 2070 | |
ba7392bb | 2071 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2072 | |
8f9d5b1a CL |
2073 | switch (addr->sa_family) { |
2074 | case AF_INET: | |
2075 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2076 | xprt_set_bound(xprt); | |
2077 | ||
2078 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2079 | xs_udp_connect_worker4); | |
b454ae90 | 2080 | xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2081 | break; |
2082 | case AF_INET6: | |
2083 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2084 | xprt_set_bound(xprt); | |
2085 | ||
2086 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2087 | xs_udp_connect_worker6); | |
b454ae90 | 2088 | xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2089 | break; |
2090 | default: | |
2091 | kfree(xprt); | |
2092 | return ERR_PTR(-EAFNOSUPPORT); | |
2093 | } | |
2094 | ||
46121cf7 | 2095 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 2096 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 2097 | |
bc25571e TT |
2098 | if (try_module_get(THIS_MODULE)) |
2099 | return xprt; | |
2100 | ||
2101 | kfree(xprt->slot); | |
2102 | kfree(xprt); | |
2103 | return ERR_PTR(-EINVAL); | |
a246b010 CL |
2104 | } |
2105 | ||
2881ae74 TM |
2106 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2107 | .to_initval = 60 * HZ, | |
2108 | .to_maxval = 60 * HZ, | |
2109 | .to_retries = 2, | |
2110 | }; | |
2111 | ||
9903cd1c CL |
2112 | /** |
2113 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2114 | * @args: rpc transport creation arguments |
9903cd1c CL |
2115 | * |
2116 | */ | |
483066d6 | 2117 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2118 | { |
8f9d5b1a | 2119 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2120 | struct rpc_xprt *xprt; |
c8475461 | 2121 | struct sock_xprt *transport; |
a246b010 | 2122 | |
96802a09 | 2123 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
2124 | if (IS_ERR(xprt)) |
2125 | return xprt; | |
c8475461 | 2126 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2127 | |
ec739ef0 | 2128 | xprt->prot = IPPROTO_TCP; |
808012fb | 2129 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2130 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2131 | |
03bf4b70 CL |
2132 | xprt->bind_timeout = XS_BIND_TO; |
2133 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
2134 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2135 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2136 | |
262965f5 | 2137 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2138 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2139 | |
8f9d5b1a CL |
2140 | switch (addr->sa_family) { |
2141 | case AF_INET: | |
2142 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2143 | xprt_set_bound(xprt); | |
2144 | ||
2145 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); | |
b454ae90 | 2146 | xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2147 | break; |
2148 | case AF_INET6: | |
2149 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2150 | xprt_set_bound(xprt); | |
2151 | ||
2152 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); | |
b454ae90 | 2153 | xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2154 | break; |
2155 | default: | |
2156 | kfree(xprt); | |
2157 | return ERR_PTR(-EAFNOSUPPORT); | |
2158 | } | |
2159 | ||
46121cf7 | 2160 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 2161 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 2162 | |
bc25571e TT |
2163 | if (try_module_get(THIS_MODULE)) |
2164 | return xprt; | |
2165 | ||
2166 | kfree(xprt->slot); | |
2167 | kfree(xprt); | |
2168 | return ERR_PTR(-EINVAL); | |
a246b010 | 2169 | } |
282b32e1 | 2170 | |
bc25571e TT |
2171 | static struct xprt_class xs_udp_transport = { |
2172 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2173 | .name = "udp", | |
2174 | .owner = THIS_MODULE, | |
4fa016eb | 2175 | .ident = IPPROTO_UDP, |
bc25571e TT |
2176 | .setup = xs_setup_udp, |
2177 | }; | |
2178 | ||
2179 | static struct xprt_class xs_tcp_transport = { | |
2180 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2181 | .name = "tcp", | |
2182 | .owner = THIS_MODULE, | |
4fa016eb | 2183 | .ident = IPPROTO_TCP, |
bc25571e TT |
2184 | .setup = xs_setup_tcp, |
2185 | }; | |
2186 | ||
282b32e1 | 2187 | /** |
bc25571e | 2188 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2189 | * |
2190 | */ | |
2191 | int init_socket_xprt(void) | |
2192 | { | |
fbf76683 | 2193 | #ifdef RPC_DEBUG |
2b1bec5f | 2194 | if (!sunrpc_table_header) |
0b4d4147 | 2195 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2196 | #endif |
2197 | ||
bc25571e TT |
2198 | xprt_register_transport(&xs_udp_transport); |
2199 | xprt_register_transport(&xs_tcp_transport); | |
2200 | ||
282b32e1 CL |
2201 | return 0; |
2202 | } | |
2203 | ||
2204 | /** | |
bc25571e | 2205 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2206 | * |
2207 | */ | |
2208 | void cleanup_socket_xprt(void) | |
2209 | { | |
fbf76683 CL |
2210 | #ifdef RPC_DEBUG |
2211 | if (sunrpc_table_header) { | |
2212 | unregister_sysctl_table(sunrpc_table_header); | |
2213 | sunrpc_table_header = NULL; | |
2214 | } | |
2215 | #endif | |
bc25571e TT |
2216 | |
2217 | xprt_unregister_transport(&xs_udp_transport); | |
2218 | xprt_unregister_transport(&xs_tcp_transport); | |
282b32e1 | 2219 | } |