]>
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 | 36 | #include <linux/file.h> |
44b98efd RL |
37 | #ifdef CONFIG_NFS_V4_1 |
38 | #include <linux/sunrpc/bc_xprt.h> | |
39 | #endif | |
a246b010 CL |
40 | |
41 | #include <net/sock.h> | |
42 | #include <net/checksum.h> | |
43 | #include <net/udp.h> | |
44 | #include <net/tcp.h> | |
45 | ||
c556b754 CL |
46 | /* |
47 | * xprtsock tunables | |
48 | */ | |
49 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
50 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
51 | ||
52 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
53 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
54 | ||
7d1e8255 | 55 | #define XS_TCP_LINGER_TO (15U * HZ) |
25fe6142 | 56 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
7d1e8255 | 57 | |
fbf76683 CL |
58 | /* |
59 | * We can register our own files under /proc/sys/sunrpc by | |
60 | * calling register_sysctl_table() again. The files in that | |
61 | * directory become the union of all files registered there. | |
62 | * | |
63 | * We simply need to make sure that we don't collide with | |
64 | * someone else's file names! | |
65 | */ | |
66 | ||
67 | #ifdef RPC_DEBUG | |
68 | ||
69 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
70 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
71 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; | |
72 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
73 | ||
74 | static struct ctl_table_header *sunrpc_table_header; | |
75 | ||
76 | /* | |
77 | * FIXME: changing the UDP slot table size should also resize the UDP | |
78 | * socket buffers for existing UDP transports | |
79 | */ | |
80 | static ctl_table xs_tunables_table[] = { | |
81 | { | |
82 | .ctl_name = CTL_SLOTTABLE_UDP, | |
83 | .procname = "udp_slot_table_entries", | |
84 | .data = &xprt_udp_slot_table_entries, | |
85 | .maxlen = sizeof(unsigned int), | |
86 | .mode = 0644, | |
87 | .proc_handler = &proc_dointvec_minmax, | |
88 | .strategy = &sysctl_intvec, | |
89 | .extra1 = &min_slot_table_size, | |
90 | .extra2 = &max_slot_table_size | |
91 | }, | |
92 | { | |
93 | .ctl_name = CTL_SLOTTABLE_TCP, | |
94 | .procname = "tcp_slot_table_entries", | |
95 | .data = &xprt_tcp_slot_table_entries, | |
96 | .maxlen = sizeof(unsigned int), | |
97 | .mode = 0644, | |
98 | .proc_handler = &proc_dointvec_minmax, | |
99 | .strategy = &sysctl_intvec, | |
100 | .extra1 = &min_slot_table_size, | |
101 | .extra2 = &max_slot_table_size | |
102 | }, | |
103 | { | |
104 | .ctl_name = CTL_MIN_RESVPORT, | |
105 | .procname = "min_resvport", | |
106 | .data = &xprt_min_resvport, | |
107 | .maxlen = sizeof(unsigned int), | |
108 | .mode = 0644, | |
109 | .proc_handler = &proc_dointvec_minmax, | |
110 | .strategy = &sysctl_intvec, | |
111 | .extra1 = &xprt_min_resvport_limit, | |
112 | .extra2 = &xprt_max_resvport_limit | |
113 | }, | |
114 | { | |
115 | .ctl_name = CTL_MAX_RESVPORT, | |
116 | .procname = "max_resvport", | |
117 | .data = &xprt_max_resvport, | |
118 | .maxlen = sizeof(unsigned int), | |
119 | .mode = 0644, | |
120 | .proc_handler = &proc_dointvec_minmax, | |
121 | .strategy = &sysctl_intvec, | |
122 | .extra1 = &xprt_min_resvport_limit, | |
123 | .extra2 = &xprt_max_resvport_limit | |
124 | }, | |
25fe6142 TM |
125 | { |
126 | .procname = "tcp_fin_timeout", | |
127 | .data = &xs_tcp_fin_timeout, | |
128 | .maxlen = sizeof(xs_tcp_fin_timeout), | |
129 | .mode = 0644, | |
130 | .proc_handler = &proc_dointvec_jiffies, | |
131 | .strategy = sysctl_jiffies | |
132 | }, | |
fbf76683 CL |
133 | { |
134 | .ctl_name = 0, | |
135 | }, | |
136 | }; | |
137 | ||
138 | static ctl_table sunrpc_table[] = { | |
139 | { | |
140 | .ctl_name = CTL_SUNRPC, | |
141 | .procname = "sunrpc", | |
142 | .mode = 0555, | |
143 | .child = xs_tunables_table | |
144 | }, | |
145 | { | |
146 | .ctl_name = 0, | |
147 | }, | |
148 | }; | |
149 | ||
150 | #endif | |
151 | ||
03bf4b70 CL |
152 | /* |
153 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
154 | * synchronous, but we set a timeout anyway in case of resource | |
155 | * exhaustion on the local host. | |
156 | */ | |
157 | #define XS_UDP_CONN_TO (5U * HZ) | |
158 | ||
159 | /* | |
160 | * Wait duration for an RPC TCP connection to be established. Solaris | |
161 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
162 | * long a server takes to reboot. | |
163 | */ | |
164 | #define XS_TCP_CONN_TO (60U * HZ) | |
165 | ||
166 | /* | |
167 | * Wait duration for a reply from the RPC portmapper. | |
168 | */ | |
169 | #define XS_BIND_TO (60U * HZ) | |
170 | ||
171 | /* | |
172 | * Delay if a UDP socket connect error occurs. This is most likely some | |
173 | * kind of resource problem on the local host. | |
174 | */ | |
175 | #define XS_UDP_REEST_TO (2U * HZ) | |
176 | ||
177 | /* | |
178 | * The reestablish timeout allows clients to delay for a bit before attempting | |
179 | * to reconnect to a server that just dropped our connection. | |
180 | * | |
181 | * We implement an exponential backoff when trying to reestablish a TCP | |
182 | * transport connection with the server. Some servers like to drop a TCP | |
183 | * connection when they are overworked, so we start with a short timeout and | |
184 | * increase over time if the server is down or not responding. | |
185 | */ | |
186 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
187 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
188 | ||
189 | /* | |
190 | * TCP idle timeout; client drops the transport socket if it is idle | |
191 | * for this long. Note that we also timeout UDP sockets to prevent | |
192 | * holding port numbers when there is no RPC traffic. | |
193 | */ | |
194 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
195 | ||
a246b010 CL |
196 | #ifdef RPC_DEBUG |
197 | # undef RPC_DEBUG_DATA | |
9903cd1c | 198 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
199 | #endif |
200 | ||
a246b010 | 201 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 202 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 203 | { |
9903cd1c CL |
204 | u8 *buf = (u8 *) packet; |
205 | int j; | |
a246b010 | 206 | |
46121cf7 | 207 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
208 | for (j = 0; j < count && j < 128; j += 4) { |
209 | if (!(j & 31)) { | |
210 | if (j) | |
211 | dprintk("\n"); | |
212 | dprintk("0x%04x ", j); | |
213 | } | |
214 | dprintk("%02x%02x%02x%02x ", | |
215 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
216 | } | |
217 | dprintk("\n"); | |
218 | } | |
219 | #else | |
9903cd1c | 220 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
221 | { |
222 | /* NOP */ | |
223 | } | |
224 | #endif | |
225 | ||
ffc2e518 CL |
226 | struct sock_xprt { |
227 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
228 | |
229 | /* | |
230 | * Network layer | |
231 | */ | |
232 | struct socket * sock; | |
233 | struct sock * inet; | |
51971139 CL |
234 | |
235 | /* | |
236 | * State of TCP reply receive | |
237 | */ | |
238 | __be32 tcp_fraghdr, | |
239 | tcp_xid; | |
240 | ||
241 | u32 tcp_offset, | |
242 | tcp_reclen; | |
243 | ||
244 | unsigned long tcp_copied, | |
245 | tcp_flags; | |
c8475461 CL |
246 | |
247 | /* | |
248 | * Connection of transports | |
249 | */ | |
34161db6 | 250 | struct delayed_work connect_worker; |
d3bc9a1d | 251 | struct sockaddr_storage addr; |
c8475461 | 252 | unsigned short port; |
7c6e066e CL |
253 | |
254 | /* | |
255 | * UDP socket buffer size parameters | |
256 | */ | |
257 | size_t rcvsize, | |
258 | sndsize; | |
314dfd79 CL |
259 | |
260 | /* | |
261 | * Saved socket callback addresses | |
262 | */ | |
263 | void (*old_data_ready)(struct sock *, int); | |
264 | void (*old_state_change)(struct sock *); | |
265 | void (*old_write_space)(struct sock *); | |
2a9e1cfa | 266 | void (*old_error_report)(struct sock *); |
ffc2e518 CL |
267 | }; |
268 | ||
e136d092 CL |
269 | /* |
270 | * TCP receive state flags | |
271 | */ | |
272 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
273 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
274 | #define TCP_RCV_COPY_XID (1UL << 2) | |
275 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
276 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
277 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
278 | |
279 | /* | |
280 | * TCP RPC flags | |
281 | */ | |
f4a2e418 | 282 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 283 | |
95392c59 CL |
284 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
285 | { | |
286 | return (struct sockaddr *) &xprt->addr; | |
287 | } | |
288 | ||
289 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) | |
edb267a6 | 290 | { |
95392c59 CL |
291 | return (struct sockaddr_in *) &xprt->addr; |
292 | } | |
293 | ||
294 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
295 | { | |
296 | return (struct sockaddr_in6 *) &xprt->addr; | |
297 | } | |
298 | ||
b454ae90 CL |
299 | static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt, |
300 | const char *protocol, | |
301 | const char *netid) | |
edb267a6 | 302 | { |
95392c59 | 303 | struct sockaddr_in *addr = xs_addr_in(xprt); |
edb267a6 CL |
304 | char *buf; |
305 | ||
306 | buf = kzalloc(20, GFP_KERNEL); | |
307 | if (buf) { | |
e0db4a78 | 308 | snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr); |
edb267a6 CL |
309 | } |
310 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
311 | ||
312 | buf = kzalloc(8, GFP_KERNEL); | |
313 | if (buf) { | |
314 | snprintf(buf, 8, "%u", | |
315 | ntohs(addr->sin_port)); | |
316 | } | |
317 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
318 | ||
b454ae90 | 319 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
edb267a6 CL |
320 | |
321 | buf = kzalloc(48, GFP_KERNEL); | |
322 | if (buf) { | |
21454aaa HH |
323 | snprintf(buf, 48, "addr=%pI4 port=%u proto=%s", |
324 | &addr->sin_addr.s_addr, | |
edb267a6 | 325 | ntohs(addr->sin_port), |
b454ae90 | 326 | protocol); |
edb267a6 CL |
327 | } |
328 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
fbfe3cc6 CL |
329 | |
330 | buf = kzalloc(10, GFP_KERNEL); | |
331 | if (buf) { | |
332 | snprintf(buf, 10, "%02x%02x%02x%02x", | |
333 | NIPQUAD(addr->sin_addr.s_addr)); | |
334 | } | |
335 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; | |
336 | ||
337 | buf = kzalloc(8, GFP_KERNEL); | |
338 | if (buf) { | |
339 | snprintf(buf, 8, "%4hx", | |
340 | ntohs(addr->sin_port)); | |
341 | } | |
342 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; | |
756805e7 CL |
343 | |
344 | buf = kzalloc(30, GFP_KERNEL); | |
345 | if (buf) { | |
21454aaa HH |
346 | snprintf(buf, 30, "%pI4.%u.%u", |
347 | &addr->sin_addr.s_addr, | |
756805e7 CL |
348 | ntohs(addr->sin_port) >> 8, |
349 | ntohs(addr->sin_port) & 0xff); | |
350 | } | |
351 | xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; | |
4417c8c4 | 352 | |
b454ae90 | 353 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
edb267a6 CL |
354 | } |
355 | ||
b454ae90 CL |
356 | static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt, |
357 | const char *protocol, | |
358 | const char *netid) | |
4b6473fb | 359 | { |
95392c59 | 360 | struct sockaddr_in6 *addr = xs_addr_in6(xprt); |
4b6473fb CL |
361 | char *buf; |
362 | ||
363 | buf = kzalloc(40, GFP_KERNEL); | |
364 | if (buf) { | |
5b095d98 | 365 | snprintf(buf, 40, "%pI6",&addr->sin6_addr); |
4b6473fb CL |
366 | } |
367 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
368 | ||
369 | buf = kzalloc(8, GFP_KERNEL); | |
370 | if (buf) { | |
371 | snprintf(buf, 8, "%u", | |
372 | ntohs(addr->sin6_port)); | |
373 | } | |
374 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
375 | ||
b454ae90 | 376 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
4b6473fb CL |
377 | |
378 | buf = kzalloc(64, GFP_KERNEL); | |
379 | if (buf) { | |
5b095d98 | 380 | snprintf(buf, 64, "addr=%pI6 port=%u proto=%s", |
fdb46ee7 | 381 | &addr->sin6_addr, |
4b6473fb | 382 | ntohs(addr->sin6_port), |
b454ae90 | 383 | protocol); |
4b6473fb CL |
384 | } |
385 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
386 | ||
387 | buf = kzalloc(36, GFP_KERNEL); | |
b071195d | 388 | if (buf) |
4b7a4274 | 389 | snprintf(buf, 36, "%pi6", &addr->sin6_addr); |
b071195d | 390 | |
4b6473fb CL |
391 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; |
392 | ||
393 | buf = kzalloc(8, GFP_KERNEL); | |
394 | if (buf) { | |
395 | snprintf(buf, 8, "%4hx", | |
396 | ntohs(addr->sin6_port)); | |
397 | } | |
398 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; | |
756805e7 CL |
399 | |
400 | buf = kzalloc(50, GFP_KERNEL); | |
401 | if (buf) { | |
5b095d98 | 402 | snprintf(buf, 50, "%pI6.%u.%u", |
fdb46ee7 HH |
403 | &addr->sin6_addr, |
404 | ntohs(addr->sin6_port) >> 8, | |
405 | ntohs(addr->sin6_port) & 0xff); | |
756805e7 CL |
406 | } |
407 | xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; | |
4417c8c4 | 408 | |
b454ae90 | 409 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
edb267a6 CL |
410 | } |
411 | ||
412 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
413 | { | |
33e01dc7 CL |
414 | unsigned int i; |
415 | ||
416 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
417 | switch (i) { | |
418 | case RPC_DISPLAY_PROTO: | |
419 | case RPC_DISPLAY_NETID: | |
420 | continue; | |
421 | default: | |
422 | kfree(xprt->address_strings[i]); | |
423 | } | |
edb267a6 CL |
424 | } |
425 | ||
b4b5cc85 CL |
426 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
427 | ||
24c5684b | 428 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 429 | { |
b4b5cc85 CL |
430 | struct msghdr msg = { |
431 | .msg_name = addr, | |
432 | .msg_namelen = addrlen, | |
24c5684b TM |
433 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
434 | }; | |
435 | struct kvec iov = { | |
436 | .iov_base = vec->iov_base + base, | |
437 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
438 | }; |
439 | ||
24c5684b | 440 | if (iov.iov_len != 0) |
b4b5cc85 CL |
441 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
442 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
443 | } | |
444 | ||
24c5684b | 445 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 446 | { |
24c5684b TM |
447 | struct page **ppage; |
448 | unsigned int remainder; | |
449 | int err, sent = 0; | |
450 | ||
451 | remainder = xdr->page_len - base; | |
452 | base += xdr->page_base; | |
453 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
454 | base &= ~PAGE_MASK; | |
455 | for(;;) { | |
456 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
457 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 458 | |
24c5684b TM |
459 | remainder -= len; |
460 | if (remainder != 0 || more) | |
461 | flags |= MSG_MORE; | |
462 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
463 | if (remainder == 0 || err != len) | |
464 | break; | |
465 | sent += err; | |
466 | ppage++; | |
467 | base = 0; | |
468 | } | |
469 | if (sent == 0) | |
470 | return err; | |
471 | if (err > 0) | |
472 | sent += err; | |
473 | return sent; | |
b4b5cc85 CL |
474 | } |
475 | ||
9903cd1c CL |
476 | /** |
477 | * xs_sendpages - write pages directly to a socket | |
478 | * @sock: socket to send on | |
479 | * @addr: UDP only -- address of destination | |
480 | * @addrlen: UDP only -- length of destination address | |
481 | * @xdr: buffer containing this request | |
482 | * @base: starting position in the buffer | |
483 | * | |
a246b010 | 484 | */ |
24c5684b | 485 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 486 | { |
24c5684b TM |
487 | unsigned int remainder = xdr->len - base; |
488 | int err, sent = 0; | |
a246b010 | 489 | |
262965f5 | 490 | if (unlikely(!sock)) |
fba91afb | 491 | return -ENOTSOCK; |
262965f5 CL |
492 | |
493 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
494 | if (base != 0) { |
495 | addr = NULL; | |
496 | addrlen = 0; | |
497 | } | |
262965f5 | 498 | |
24c5684b TM |
499 | if (base < xdr->head[0].iov_len || addr != NULL) { |
500 | unsigned int len = xdr->head[0].iov_len - base; | |
501 | remainder -= len; | |
502 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
503 | if (remainder == 0 || err != len) | |
a246b010 | 504 | goto out; |
24c5684b | 505 | sent += err; |
a246b010 CL |
506 | base = 0; |
507 | } else | |
24c5684b | 508 | base -= xdr->head[0].iov_len; |
a246b010 | 509 | |
24c5684b TM |
510 | if (base < xdr->page_len) { |
511 | unsigned int len = xdr->page_len - base; | |
512 | remainder -= len; | |
513 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
514 | if (remainder == 0 || err != len) | |
a246b010 | 515 | goto out; |
24c5684b | 516 | sent += err; |
a246b010 | 517 | base = 0; |
24c5684b TM |
518 | } else |
519 | base -= xdr->page_len; | |
520 | ||
521 | if (base >= xdr->tail[0].iov_len) | |
522 | return sent; | |
523 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 524 | out: |
24c5684b TM |
525 | if (sent == 0) |
526 | return err; | |
527 | if (err > 0) | |
528 | sent += err; | |
529 | return sent; | |
a246b010 CL |
530 | } |
531 | ||
b6ddf64f TM |
532 | static void xs_nospace_callback(struct rpc_task *task) |
533 | { | |
534 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
535 | ||
536 | transport->inet->sk_write_pending--; | |
537 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
538 | } | |
539 | ||
9903cd1c | 540 | /** |
262965f5 CL |
541 | * xs_nospace - place task on wait queue if transmit was incomplete |
542 | * @task: task to put to sleep | |
9903cd1c | 543 | * |
a246b010 | 544 | */ |
5e3771ce | 545 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 546 | { |
262965f5 CL |
547 | struct rpc_rqst *req = task->tk_rqstp; |
548 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 549 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
5e3771ce | 550 | int ret = 0; |
a246b010 | 551 | |
46121cf7 | 552 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
553 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
554 | req->rq_slen); | |
555 | ||
b6ddf64f TM |
556 | /* Protect against races with write_space */ |
557 | spin_lock_bh(&xprt->transport_lock); | |
558 | ||
559 | /* Don't race with disconnect */ | |
560 | if (xprt_connected(xprt)) { | |
561 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
5e3771ce | 562 | ret = -EAGAIN; |
b6ddf64f TM |
563 | /* |
564 | * Notify TCP that we're limited by the application | |
565 | * window size | |
566 | */ | |
567 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
568 | transport->inet->sk_write_pending++; | |
569 | /* ...and wait for more buffer space */ | |
570 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
571 | } | |
572 | } else { | |
573 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 574 | ret = -ENOTCONN; |
b6ddf64f | 575 | } |
262965f5 | 576 | |
b6ddf64f | 577 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 578 | return ret; |
262965f5 CL |
579 | } |
580 | ||
581 | /** | |
582 | * xs_udp_send_request - write an RPC request to a UDP socket | |
583 | * @task: address of RPC task that manages the state of an RPC request | |
584 | * | |
585 | * Return values: | |
586 | * 0: The request has been sent | |
587 | * EAGAIN: The socket was blocked, please call again later to | |
588 | * complete the request | |
589 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
590 | * other: Some other error occured, the request was not sent | |
591 | */ | |
592 | static int xs_udp_send_request(struct rpc_task *task) | |
593 | { | |
594 | struct rpc_rqst *req = task->tk_rqstp; | |
595 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 596 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
597 | struct xdr_buf *xdr = &req->rq_snd_buf; |
598 | int status; | |
a246b010 | 599 | |
9903cd1c | 600 | xs_pktdump("packet data:", |
a246b010 CL |
601 | req->rq_svec->iov_base, |
602 | req->rq_svec->iov_len); | |
603 | ||
01d37c42 TM |
604 | if (!xprt_bound(xprt)) |
605 | return -ENOTCONN; | |
ee0ac0c2 | 606 | status = xs_sendpages(transport->sock, |
95392c59 | 607 | xs_addr(xprt), |
ee0ac0c2 CL |
608 | xprt->addrlen, xdr, |
609 | req->rq_bytes_sent); | |
a246b010 | 610 | |
46121cf7 | 611 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 612 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 613 | |
2199700f TM |
614 | if (status >= 0) { |
615 | task->tk_bytes_sent += status; | |
616 | if (status >= req->rq_slen) | |
617 | return 0; | |
618 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 619 | status = -EAGAIN; |
2199700f | 620 | } |
c8485e4d TM |
621 | if (!transport->sock) |
622 | goto out; | |
a246b010 | 623 | |
262965f5 | 624 | switch (status) { |
fba91afb TM |
625 | case -ENOTSOCK: |
626 | status = -ENOTCONN; | |
627 | /* Should we call xs_close() here? */ | |
628 | break; | |
b6ddf64f | 629 | case -EAGAIN: |
5e3771ce | 630 | status = xs_nospace(task); |
b6ddf64f | 631 | break; |
c8485e4d TM |
632 | default: |
633 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
634 | -status); | |
262965f5 CL |
635 | case -ENETUNREACH: |
636 | case -EPIPE: | |
a246b010 CL |
637 | case -ECONNREFUSED: |
638 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 639 | * prompts ECONNREFUSED. */ |
b6ddf64f | 640 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 641 | } |
c8485e4d | 642 | out: |
262965f5 | 643 | return status; |
a246b010 CL |
644 | } |
645 | ||
e06799f9 TM |
646 | /** |
647 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
648 | * @xprt: transport | |
649 | * | |
650 | * Initiates a graceful shutdown of the TCP socket by calling the | |
651 | * equivalent of shutdown(SHUT_WR); | |
652 | */ | |
653 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
654 | { | |
655 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
656 | struct socket *sock = transport->sock; | |
657 | ||
658 | if (sock != NULL) | |
659 | kernel_sock_shutdown(sock, SHUT_WR); | |
660 | } | |
661 | ||
808012fb CL |
662 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
663 | { | |
664 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
665 | rpc_fraghdr *base = buf->head[0].iov_base; | |
666 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
667 | } | |
668 | ||
9903cd1c | 669 | /** |
262965f5 | 670 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
671 | * @task: address of RPC task that manages the state of an RPC request |
672 | * | |
673 | * Return values: | |
262965f5 CL |
674 | * 0: The request has been sent |
675 | * EAGAIN: The socket was blocked, please call again later to | |
676 | * complete the request | |
677 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
678 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
679 | * |
680 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 681 | * if sendmsg is not able to make progress? |
9903cd1c | 682 | */ |
262965f5 | 683 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
684 | { |
685 | struct rpc_rqst *req = task->tk_rqstp; | |
686 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 687 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 688 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 689 | int status; |
a246b010 | 690 | |
808012fb | 691 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 692 | |
262965f5 CL |
693 | xs_pktdump("packet data:", |
694 | req->rq_svec->iov_base, | |
695 | req->rq_svec->iov_len); | |
a246b010 CL |
696 | |
697 | /* Continue transmitting the packet/record. We must be careful | |
698 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 699 | * called sendmsg(). */ |
a246b010 | 700 | while (1) { |
ee0ac0c2 CL |
701 | status = xs_sendpages(transport->sock, |
702 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 703 | |
46121cf7 | 704 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 705 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 706 | |
262965f5 | 707 | if (unlikely(status < 0)) |
a246b010 | 708 | break; |
a246b010 | 709 | |
262965f5 CL |
710 | /* If we've sent the entire packet, immediately |
711 | * reset the count of bytes sent. */ | |
712 | req->rq_bytes_sent += status; | |
ef759a2e | 713 | task->tk_bytes_sent += status; |
262965f5 CL |
714 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
715 | req->rq_bytes_sent = 0; | |
716 | return 0; | |
717 | } | |
a246b010 | 718 | |
06b4b681 TM |
719 | if (status != 0) |
720 | continue; | |
a246b010 | 721 | status = -EAGAIN; |
06b4b681 | 722 | break; |
a246b010 | 723 | } |
c8485e4d TM |
724 | if (!transport->sock) |
725 | goto out; | |
a246b010 | 726 | |
262965f5 | 727 | switch (status) { |
fba91afb TM |
728 | case -ENOTSOCK: |
729 | status = -ENOTCONN; | |
730 | /* Should we call xs_close() here? */ | |
731 | break; | |
262965f5 | 732 | case -EAGAIN: |
5e3771ce | 733 | status = xs_nospace(task); |
262965f5 | 734 | break; |
c8485e4d TM |
735 | default: |
736 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
737 | -status); | |
262965f5 | 738 | case -ECONNRESET: |
55420c24 | 739 | case -EPIPE: |
2a9e1cfa TM |
740 | xs_tcp_shutdown(xprt); |
741 | case -ECONNREFUSED: | |
262965f5 | 742 | case -ENOTCONN: |
b6ddf64f | 743 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 744 | } |
c8485e4d | 745 | out: |
a246b010 CL |
746 | return status; |
747 | } | |
748 | ||
e0ab53de TM |
749 | /** |
750 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
751 | * @xprt: transport | |
752 | * @task: rpc task | |
753 | * | |
754 | * This cleans up if an error causes us to abort the transmission of a request. | |
755 | * In this case, the socket may need to be reset in order to avoid confusing | |
756 | * the server. | |
757 | */ | |
758 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
759 | { | |
760 | struct rpc_rqst *req; | |
761 | ||
762 | if (task != xprt->snd_task) | |
763 | return; | |
764 | if (task == NULL) | |
765 | goto out_release; | |
766 | req = task->tk_rqstp; | |
767 | if (req->rq_bytes_sent == 0) | |
768 | goto out_release; | |
769 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
770 | goto out_release; | |
771 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
772 | out_release: | |
773 | xprt_release_xprt(xprt, task); | |
774 | } | |
775 | ||
2a9e1cfa TM |
776 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
777 | { | |
778 | transport->old_data_ready = sk->sk_data_ready; | |
779 | transport->old_state_change = sk->sk_state_change; | |
780 | transport->old_write_space = sk->sk_write_space; | |
781 | transport->old_error_report = sk->sk_error_report; | |
782 | } | |
783 | ||
784 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
785 | { | |
786 | sk->sk_data_ready = transport->old_data_ready; | |
787 | sk->sk_state_change = transport->old_state_change; | |
788 | sk->sk_write_space = transport->old_write_space; | |
789 | sk->sk_error_report = transport->old_error_report; | |
790 | } | |
791 | ||
fe315e76 | 792 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 793 | { |
ee0ac0c2 CL |
794 | struct socket *sock = transport->sock; |
795 | struct sock *sk = transport->inet; | |
a246b010 | 796 | |
fe315e76 CL |
797 | if (sk == NULL) |
798 | return; | |
9903cd1c | 799 | |
a246b010 | 800 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
801 | transport->inet = NULL; |
802 | transport->sock = NULL; | |
a246b010 | 803 | |
9903cd1c | 804 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
805 | |
806 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
807 | write_unlock_bh(&sk->sk_callback_lock); |
808 | ||
9903cd1c | 809 | sk->sk_no_check = 0; |
a246b010 CL |
810 | |
811 | sock_release(sock); | |
fe315e76 CL |
812 | } |
813 | ||
814 | /** | |
815 | * xs_close - close a socket | |
816 | * @xprt: transport | |
817 | * | |
818 | * This is used when all requests are complete; ie, no DRC state remains | |
819 | * on the server we want to save. | |
f75e6745 TM |
820 | * |
821 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
822 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
823 | */ |
824 | static void xs_close(struct rpc_xprt *xprt) | |
825 | { | |
826 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
827 | ||
828 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
829 | ||
830 | xs_reset_transport(transport); | |
831 | ||
632e3bdc | 832 | smp_mb__before_clear_bit(); |
7d1e8255 | 833 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 834 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 835 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 836 | smp_mb__after_clear_bit(); |
62da3b24 | 837 | xprt_disconnect_done(xprt); |
a246b010 CL |
838 | } |
839 | ||
f75e6745 TM |
840 | static void xs_tcp_close(struct rpc_xprt *xprt) |
841 | { | |
842 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
843 | xs_close(xprt); | |
844 | else | |
845 | xs_tcp_shutdown(xprt); | |
846 | } | |
847 | ||
9903cd1c CL |
848 | /** |
849 | * xs_destroy - prepare to shutdown a transport | |
850 | * @xprt: doomed transport | |
851 | * | |
852 | */ | |
853 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 854 | { |
c8475461 CL |
855 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
856 | ||
46121cf7 | 857 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 858 | |
c1384c9c | 859 | cancel_rearming_delayed_work(&transport->connect_worker); |
a246b010 | 860 | |
9903cd1c | 861 | xs_close(xprt); |
edb267a6 | 862 | xs_free_peer_addresses(xprt); |
a246b010 | 863 | kfree(xprt->slot); |
c8541ecd | 864 | kfree(xprt); |
bc25571e | 865 | module_put(THIS_MODULE); |
a246b010 CL |
866 | } |
867 | ||
9903cd1c CL |
868 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
869 | { | |
870 | return (struct rpc_xprt *) sk->sk_user_data; | |
871 | } | |
872 | ||
873 | /** | |
874 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
875 | * @sk: socket with data to read | |
876 | * @len: how much data to read | |
877 | * | |
a246b010 | 878 | */ |
9903cd1c | 879 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 880 | { |
9903cd1c CL |
881 | struct rpc_task *task; |
882 | struct rpc_xprt *xprt; | |
a246b010 | 883 | struct rpc_rqst *rovr; |
9903cd1c | 884 | struct sk_buff *skb; |
a246b010 | 885 | int err, repsize, copied; |
d8ed029d AD |
886 | u32 _xid; |
887 | __be32 *xp; | |
a246b010 CL |
888 | |
889 | read_lock(&sk->sk_callback_lock); | |
46121cf7 | 890 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 891 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 892 | goto out; |
a246b010 CL |
893 | |
894 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
895 | goto out; | |
896 | ||
897 | if (xprt->shutdown) | |
898 | goto dropit; | |
899 | ||
900 | repsize = skb->len - sizeof(struct udphdr); | |
901 | if (repsize < 4) { | |
46121cf7 | 902 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
903 | goto dropit; |
904 | } | |
905 | ||
906 | /* Copy the XID from the skb... */ | |
907 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
908 | sizeof(_xid), &_xid); | |
909 | if (xp == NULL) | |
910 | goto dropit; | |
911 | ||
912 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 913 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
914 | rovr = xprt_lookup_rqst(xprt, *xp); |
915 | if (!rovr) | |
916 | goto out_unlock; | |
917 | task = rovr->rq_task; | |
918 | ||
a246b010 CL |
919 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
920 | copied = repsize; | |
921 | ||
922 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
923 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
924 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 925 | goto out_unlock; |
1781f7f5 HX |
926 | } |
927 | ||
928 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 CL |
929 | |
930 | /* Something worked... */ | |
adf30907 | 931 | dst_confirm(skb_dst(skb)); |
a246b010 | 932 | |
1570c1e4 CL |
933 | xprt_adjust_cwnd(task, copied); |
934 | xprt_update_rtt(task); | |
935 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
936 | |
937 | out_unlock: | |
4a0f8c04 | 938 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
939 | dropit: |
940 | skb_free_datagram(sk, skb); | |
941 | out: | |
942 | read_unlock(&sk->sk_callback_lock); | |
943 | } | |
944 | ||
dd456471 | 945 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 946 | { |
51971139 | 947 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
948 | size_t len, used; |
949 | char *p; | |
950 | ||
51971139 CL |
951 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
952 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 953 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 954 | transport->tcp_offset += used; |
a246b010 CL |
955 | if (used != len) |
956 | return; | |
808012fb | 957 | |
51971139 CL |
958 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
959 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 960 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 961 | else |
e136d092 | 962 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 963 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 964 | |
e136d092 | 965 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 966 | transport->tcp_offset = 0; |
808012fb | 967 | |
a246b010 | 968 | /* Sanity check of the record length */ |
18dca02a | 969 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 970 | dprintk("RPC: invalid TCP record fragment length\n"); |
3ebb067d | 971 | xprt_force_disconnect(xprt); |
9903cd1c | 972 | return; |
a246b010 | 973 | } |
46121cf7 | 974 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 975 | transport->tcp_reclen); |
a246b010 CL |
976 | } |
977 | ||
51971139 | 978 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 979 | { |
51971139 | 980 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 981 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 982 | transport->tcp_offset = 0; |
e136d092 CL |
983 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
984 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
985 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 986 | transport->tcp_copied = 0; |
a246b010 CL |
987 | } |
988 | } | |
989 | } | |
990 | ||
dd456471 | 991 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
992 | { |
993 | size_t len, used; | |
994 | char *p; | |
995 | ||
51971139 | 996 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 997 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 998 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 999 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1000 | transport->tcp_offset += used; |
a246b010 CL |
1001 | if (used != len) |
1002 | return; | |
e136d092 | 1003 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 1004 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 1005 | transport->tcp_copied = 4; |
18dca02a RL |
1006 | dprintk("RPC: reading %s XID %08x\n", |
1007 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
1008 | : "request with", | |
51971139 CL |
1009 | ntohl(transport->tcp_xid)); |
1010 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
1011 | } |
1012 | ||
18dca02a RL |
1013 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1014 | struct xdr_skb_reader *desc) | |
a246b010 | 1015 | { |
18dca02a RL |
1016 | size_t len, used; |
1017 | u32 offset; | |
1018 | __be32 calldir; | |
1019 | ||
1020 | /* | |
1021 | * We want transport->tcp_offset to be 8 at the end of this routine | |
1022 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
1023 | * When this function is called for the first time, | |
1024 | * transport->tcp_offset is 4 (after having already read the xid). | |
1025 | */ | |
1026 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
1027 | len = sizeof(calldir) - offset; | |
1028 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); | |
1029 | used = xdr_skb_read_bits(desc, &calldir, len); | |
1030 | transport->tcp_offset += used; | |
1031 | if (used != len) | |
1032 | return; | |
f4a2e418 RL |
1033 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
1034 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
18dca02a | 1035 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
f4a2e418 RL |
1036 | /* |
1037 | * We don't yet have the XDR buffer, so we will write the calldir | |
1038 | * out after we get the buffer from the 'struct rpc_rqst' | |
1039 | */ | |
18dca02a RL |
1040 | if (ntohl(calldir) == RPC_REPLY) |
1041 | transport->tcp_flags |= TCP_RPC_REPLY; | |
1042 | else | |
1043 | transport->tcp_flags &= ~TCP_RPC_REPLY; | |
1044 | dprintk("RPC: reading %s CALL/REPLY flag %08x\n", | |
1045 | (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1046 | "reply for" : "request with", calldir); | |
1047 | xs_tcp_check_fraghdr(transport); | |
1048 | } | |
1049 | ||
44b98efd RL |
1050 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1051 | struct xdr_skb_reader *desc, | |
1052 | struct rpc_rqst *req) | |
a246b010 | 1053 | { |
44b98efd RL |
1054 | struct sock_xprt *transport = |
1055 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1056 | struct xdr_buf *rcvbuf; |
1057 | size_t len; | |
1058 | ssize_t r; | |
1059 | ||
a246b010 | 1060 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1061 | |
1062 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1063 | /* | |
1064 | * Save the RPC direction in the XDR buffer | |
1065 | */ | |
1066 | __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? | |
1067 | htonl(RPC_REPLY) : 0; | |
1068 | ||
1069 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, | |
1070 | &calldir, sizeof(calldir)); | |
1071 | transport->tcp_copied += sizeof(calldir); | |
1072 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; | |
a246b010 CL |
1073 | } |
1074 | ||
a246b010 | 1075 | len = desc->count; |
51971139 | 1076 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1077 | struct xdr_skb_reader my_desc; |
a246b010 | 1078 | |
51971139 | 1079 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1080 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1081 | my_desc.count = len; | |
51971139 | 1082 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1083 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1084 | desc->count -= r; |
1085 | desc->offset += r; | |
1086 | } else | |
51971139 | 1087 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1088 | desc, xdr_skb_read_bits); |
a246b010 CL |
1089 | |
1090 | if (r > 0) { | |
51971139 CL |
1091 | transport->tcp_copied += r; |
1092 | transport->tcp_offset += r; | |
a246b010 CL |
1093 | } |
1094 | if (r != len) { | |
1095 | /* Error when copying to the receive buffer, | |
1096 | * usually because we weren't able to allocate | |
1097 | * additional buffer pages. All we can do now | |
e136d092 | 1098 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1099 | * will not receive any additional updates, |
1100 | * and time out. | |
1101 | * Any remaining data from this record will | |
1102 | * be discarded. | |
1103 | */ | |
e136d092 | 1104 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1105 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1106 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1107 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1108 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1109 | xprt, transport->tcp_copied, | |
1110 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1111 | return; |
a246b010 CL |
1112 | } |
1113 | ||
46121cf7 | 1114 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1115 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1116 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1117 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1118 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1119 | |
1120 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1121 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1122 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1123 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1124 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 CL |
1125 | } |
1126 | ||
44b98efd RL |
1127 | return; |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * Finds the request corresponding to the RPC xid and invokes the common | |
1132 | * tcp read code to read the data. | |
1133 | */ | |
1134 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1135 | struct xdr_skb_reader *desc) | |
1136 | { | |
1137 | struct sock_xprt *transport = | |
1138 | container_of(xprt, struct sock_xprt, xprt); | |
1139 | struct rpc_rqst *req; | |
1140 | ||
1141 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1142 | ||
1143 | /* Find and lock the request corresponding to this xid */ | |
1144 | spin_lock(&xprt->transport_lock); | |
1145 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1146 | if (!req) { | |
1147 | dprintk("RPC: XID %08x request not found!\n", | |
1148 | ntohl(transport->tcp_xid)); | |
1149 | spin_unlock(&xprt->transport_lock); | |
1150 | return -1; | |
1151 | } | |
1152 | ||
1153 | xs_tcp_read_common(xprt, desc, req); | |
1154 | ||
e136d092 | 1155 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1156 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1157 | |
4a0f8c04 | 1158 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1159 | return 0; |
1160 | } | |
1161 | ||
1162 | #if defined(CONFIG_NFS_V4_1) | |
1163 | /* | |
1164 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1165 | * tcp read code to read the data. The result is placed in the callback | |
1166 | * queue. | |
1167 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1168 | * connection and return -1. | |
1169 | */ | |
1170 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1171 | struct xdr_skb_reader *desc) | |
1172 | { | |
1173 | struct sock_xprt *transport = | |
1174 | container_of(xprt, struct sock_xprt, xprt); | |
1175 | struct rpc_rqst *req; | |
1176 | ||
1177 | req = xprt_alloc_bc_request(xprt); | |
1178 | if (req == NULL) { | |
1179 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1180 | xprt_force_disconnect(xprt); | |
1181 | return -1; | |
1182 | } | |
1183 | ||
1184 | req->rq_xid = transport->tcp_xid; | |
1185 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1186 | xs_tcp_read_common(xprt, desc, req); | |
1187 | ||
1188 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1189 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1190 | ||
1191 | /* | |
1192 | * Add callback request to callback list. The callback | |
1193 | * service sleeps on the sv_cb_waitq waiting for new | |
1194 | * requests. Wake it up after adding enqueing the | |
1195 | * request. | |
1196 | */ | |
1197 | dprintk("RPC: add callback request to list\n"); | |
1198 | spin_lock(&bc_serv->sv_cb_lock); | |
1199 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1200 | spin_unlock(&bc_serv->sv_cb_lock); | |
1201 | wake_up(&bc_serv->sv_cb_waitq); | |
1202 | } | |
1203 | ||
1204 | req->rq_private_buf.len = transport->tcp_copied; | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1210 | struct xdr_skb_reader *desc) | |
1211 | { | |
1212 | struct sock_xprt *transport = | |
1213 | container_of(xprt, struct sock_xprt, xprt); | |
1214 | ||
1215 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1216 | xs_tcp_read_reply(xprt, desc) : | |
1217 | xs_tcp_read_callback(xprt, desc); | |
1218 | } | |
1219 | #else | |
1220 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1221 | struct xdr_skb_reader *desc) | |
1222 | { | |
1223 | return xs_tcp_read_reply(xprt, desc); | |
1224 | } | |
1225 | #endif /* CONFIG_NFS_V4_1 */ | |
1226 | ||
1227 | /* | |
1228 | * Read data off the transport. This can be either an RPC_CALL or an | |
1229 | * RPC_REPLY. Relay the processing to helper functions. | |
1230 | */ | |
1231 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1232 | struct xdr_skb_reader *desc) | |
1233 | { | |
1234 | struct sock_xprt *transport = | |
1235 | container_of(xprt, struct sock_xprt, xprt); | |
1236 | ||
1237 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1238 | xs_tcp_check_fraghdr(transport); | |
1239 | else { | |
1240 | /* | |
1241 | * The transport_lock protects the request handling. | |
1242 | * There's no need to hold it to update the tcp_flags. | |
1243 | */ | |
1244 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1245 | } | |
a246b010 CL |
1246 | } |
1247 | ||
dd456471 | 1248 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1249 | { |
1250 | size_t len; | |
1251 | ||
51971139 | 1252 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1253 | if (len > desc->count) |
1254 | len = desc->count; | |
1255 | desc->count -= len; | |
1256 | desc->offset += len; | |
51971139 | 1257 | transport->tcp_offset += len; |
46121cf7 | 1258 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1259 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1260 | } |
1261 | ||
9903cd1c | 1262 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1263 | { |
1264 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1265 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1266 | struct xdr_skb_reader desc = { |
a246b010 CL |
1267 | .skb = skb, |
1268 | .offset = offset, | |
1269 | .count = len, | |
9903cd1c | 1270 | }; |
a246b010 | 1271 | |
46121cf7 | 1272 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1273 | do { |
1274 | /* Read in a new fragment marker if necessary */ | |
1275 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1276 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1277 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1278 | continue; |
1279 | } | |
1280 | /* Read in the xid if necessary */ | |
e136d092 | 1281 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1282 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1283 | continue; |
1284 | } | |
18dca02a | 1285 | /* Read in the call/reply flag */ |
f4a2e418 | 1286 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1287 | xs_tcp_read_calldir(transport, &desc); |
1288 | continue; | |
1289 | } | |
a246b010 | 1290 | /* Read in the request data */ |
e136d092 | 1291 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1292 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1293 | continue; |
1294 | } | |
1295 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1296 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1297 | } while (desc.count); |
46121cf7 | 1298 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1299 | return len - desc.count; |
1300 | } | |
1301 | ||
9903cd1c CL |
1302 | /** |
1303 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1304 | * @sk: socket with data to read | |
1305 | * @bytes: how much data to read | |
1306 | * | |
1307 | */ | |
1308 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1309 | { |
1310 | struct rpc_xprt *xprt; | |
1311 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1312 | int read; |
a246b010 | 1313 | |
46121cf7 CL |
1314 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1315 | ||
a246b010 | 1316 | read_lock(&sk->sk_callback_lock); |
9903cd1c | 1317 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1318 | goto out; |
a246b010 CL |
1319 | if (xprt->shutdown) |
1320 | goto out; | |
1321 | ||
9903cd1c | 1322 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1323 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1324 | do { |
1325 | rd_desc.count = 65536; | |
1326 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1327 | } while (read > 0); | |
a246b010 CL |
1328 | out: |
1329 | read_unlock(&sk->sk_callback_lock); | |
1330 | } | |
1331 | ||
7d1e8255 TM |
1332 | /* |
1333 | * Do the equivalent of linger/linger2 handling for dealing with | |
1334 | * broken servers that don't close the socket in a timely | |
1335 | * fashion | |
1336 | */ | |
1337 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1338 | unsigned long timeout) | |
1339 | { | |
1340 | struct sock_xprt *transport; | |
1341 | ||
1342 | if (xprt_test_and_set_connecting(xprt)) | |
1343 | return; | |
1344 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1345 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1346 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1347 | timeout); | |
1348 | } | |
1349 | ||
1350 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1351 | { | |
1352 | struct sock_xprt *transport; | |
1353 | ||
1354 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1355 | ||
1356 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1357 | !cancel_delayed_work(&transport->connect_worker)) | |
1358 | return; | |
1359 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1360 | xprt_clear_connecting(xprt); | |
1361 | } | |
1362 | ||
1363 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1364 | { | |
1365 | smp_mb__before_clear_bit(); | |
1366 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1367 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1368 | smp_mb__after_clear_bit(); | |
1369 | /* Mark transport as closed and wake up all pending tasks */ | |
1370 | xprt_disconnect_done(xprt); | |
1371 | } | |
1372 | ||
9903cd1c CL |
1373 | /** |
1374 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1375 | * @sk: socket whose state has changed | |
1376 | * | |
1377 | */ | |
1378 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1379 | { |
9903cd1c | 1380 | struct rpc_xprt *xprt; |
a246b010 CL |
1381 | |
1382 | read_lock(&sk->sk_callback_lock); | |
1383 | if (!(xprt = xprt_from_sock(sk))) | |
1384 | goto out; | |
46121cf7 CL |
1385 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1386 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", | |
1387 | sk->sk_state, xprt_connected(xprt), | |
1388 | sock_flag(sk, SOCK_DEAD), | |
1389 | sock_flag(sk, SOCK_ZAPPED)); | |
a246b010 CL |
1390 | |
1391 | switch (sk->sk_state) { | |
1392 | case TCP_ESTABLISHED: | |
4a0f8c04 | 1393 | spin_lock_bh(&xprt->transport_lock); |
a246b010 | 1394 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1395 | struct sock_xprt *transport = container_of(xprt, |
1396 | struct sock_xprt, xprt); | |
1397 | ||
a246b010 | 1398 | /* Reset TCP record info */ |
51971139 CL |
1399 | transport->tcp_offset = 0; |
1400 | transport->tcp_reclen = 0; | |
1401 | transport->tcp_copied = 0; | |
e136d092 CL |
1402 | transport->tcp_flags = |
1403 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1404 | |
2a491991 | 1405 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1406 | } |
4a0f8c04 | 1407 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 | 1408 | break; |
3b948ae5 TM |
1409 | case TCP_FIN_WAIT1: |
1410 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1411 | xprt->connect_cookie++; |
663b8858 | 1412 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1413 | set_bit(XPRT_CLOSING, &xprt->state); |
1414 | smp_mb__before_clear_bit(); | |
1415 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1416 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1417 | smp_mb__after_clear_bit(); |
25fe6142 | 1418 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1419 | break; |
632e3bdc | 1420 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1421 | /* The server initiated a shutdown of the socket */ |
66af1e55 | 1422 | xprt_force_disconnect(xprt); |
663b8858 | 1423 | case TCP_SYN_SENT: |
7c1d71cf | 1424 | xprt->connect_cookie++; |
663b8858 TM |
1425 | case TCP_CLOSING: |
1426 | /* | |
1427 | * If the server closed down the connection, make sure that | |
1428 | * we back off before reconnecting | |
1429 | */ | |
1430 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1431 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1432 | break; |
1433 | case TCP_LAST_ACK: | |
670f9457 | 1434 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1435 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1436 | smp_mb__before_clear_bit(); |
1437 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1438 | smp_mb__after_clear_bit(); | |
1439 | break; | |
1440 | case TCP_CLOSE: | |
7d1e8255 TM |
1441 | xs_tcp_cancel_linger_timeout(xprt); |
1442 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1443 | } |
1444 | out: | |
1445 | read_unlock(&sk->sk_callback_lock); | |
1446 | } | |
1447 | ||
2a9e1cfa | 1448 | /** |
482f32e6 | 1449 | * xs_error_report - callback mainly for catching socket errors |
2a9e1cfa TM |
1450 | * @sk: socket |
1451 | */ | |
482f32e6 | 1452 | static void xs_error_report(struct sock *sk) |
2a9e1cfa TM |
1453 | { |
1454 | struct rpc_xprt *xprt; | |
1455 | ||
1456 | read_lock(&sk->sk_callback_lock); | |
2a9e1cfa TM |
1457 | if (!(xprt = xprt_from_sock(sk))) |
1458 | goto out; | |
1459 | dprintk("RPC: %s client %p...\n" | |
1460 | "RPC: error %d\n", | |
1461 | __func__, xprt, sk->sk_err); | |
482f32e6 | 1462 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
2a9e1cfa TM |
1463 | out: |
1464 | read_unlock(&sk->sk_callback_lock); | |
1465 | } | |
1466 | ||
1f0fa154 IJ |
1467 | static void xs_write_space(struct sock *sk) |
1468 | { | |
1469 | struct socket *sock; | |
1470 | struct rpc_xprt *xprt; | |
1471 | ||
1472 | if (unlikely(!(sock = sk->sk_socket))) | |
1473 | return; | |
1474 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1475 | ||
1476 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1477 | return; | |
1478 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1479 | return; | |
1480 | ||
1481 | xprt_write_space(xprt); | |
1482 | } | |
1483 | ||
9903cd1c | 1484 | /** |
c7b2cae8 CL |
1485 | * xs_udp_write_space - callback invoked when socket buffer space |
1486 | * becomes available | |
9903cd1c CL |
1487 | * @sk: socket whose state has changed |
1488 | * | |
a246b010 CL |
1489 | * Called when more output buffer space is available for this socket. |
1490 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1491 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1492 | * with a bunch of small requests. |
1493 | */ | |
c7b2cae8 | 1494 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1495 | { |
a246b010 | 1496 | read_lock(&sk->sk_callback_lock); |
a246b010 | 1497 | |
c7b2cae8 | 1498 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1499 | if (sock_writeable(sk)) |
1500 | xs_write_space(sk); | |
a246b010 | 1501 | |
c7b2cae8 CL |
1502 | read_unlock(&sk->sk_callback_lock); |
1503 | } | |
a246b010 | 1504 | |
c7b2cae8 CL |
1505 | /** |
1506 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1507 | * becomes available | |
1508 | * @sk: socket whose state has changed | |
1509 | * | |
1510 | * Called when more output buffer space is available for this socket. | |
1511 | * We try not to wake our writers until they can make "significant" | |
1512 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1513 | * with a bunch of small requests. | |
1514 | */ | |
1515 | static void xs_tcp_write_space(struct sock *sk) | |
1516 | { | |
1517 | read_lock(&sk->sk_callback_lock); | |
1518 | ||
1519 | /* from net/core/stream.c:sk_stream_write_space */ | |
1f0fa154 IJ |
1520 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1521 | xs_write_space(sk); | |
b6ddf64f | 1522 | |
a246b010 CL |
1523 | read_unlock(&sk->sk_callback_lock); |
1524 | } | |
1525 | ||
470056c2 | 1526 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1527 | { |
ee0ac0c2 CL |
1528 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1529 | struct sock *sk = transport->inet; | |
a246b010 | 1530 | |
7c6e066e | 1531 | if (transport->rcvsize) { |
a246b010 | 1532 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1533 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1534 | } |
7c6e066e | 1535 | if (transport->sndsize) { |
a246b010 | 1536 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1537 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1538 | sk->sk_write_space(sk); |
1539 | } | |
1540 | } | |
1541 | ||
43118c29 | 1542 | /** |
470056c2 | 1543 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1544 | * @xprt: generic transport |
470056c2 CL |
1545 | * @sndsize: requested size of send buffer, in bytes |
1546 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1547 | * |
470056c2 | 1548 | * Set socket send and receive buffer size limits. |
43118c29 | 1549 | */ |
470056c2 | 1550 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1551 | { |
7c6e066e CL |
1552 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1553 | ||
1554 | transport->sndsize = 0; | |
470056c2 | 1555 | if (sndsize) |
7c6e066e CL |
1556 | transport->sndsize = sndsize + 1024; |
1557 | transport->rcvsize = 0; | |
470056c2 | 1558 | if (rcvsize) |
7c6e066e | 1559 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1560 | |
1561 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1562 | } |
1563 | ||
46c0ee8b CL |
1564 | /** |
1565 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1566 | * @task: task that timed out | |
1567 | * | |
1568 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1569 | */ | |
1570 | static void xs_udp_timer(struct rpc_task *task) | |
1571 | { | |
1572 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1573 | } | |
1574 | ||
b85d8806 CL |
1575 | static unsigned short xs_get_random_port(void) |
1576 | { | |
1577 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1578 | unsigned short rand = (unsigned short) net_random() % range; | |
1579 | return rand + xprt_min_resvport; | |
1580 | } | |
1581 | ||
92200412 CL |
1582 | /** |
1583 | * xs_set_port - reset the port number in the remote endpoint address | |
1584 | * @xprt: generic transport | |
1585 | * @port: new port number | |
1586 | * | |
1587 | */ | |
1588 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1589 | { | |
95392c59 | 1590 | struct sockaddr *addr = xs_addr(xprt); |
c4efcb1d | 1591 | |
46121cf7 | 1592 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1593 | |
20612005 CL |
1594 | switch (addr->sa_family) { |
1595 | case AF_INET: | |
1596 | ((struct sockaddr_in *)addr)->sin_port = htons(port); | |
1597 | break; | |
1598 | case AF_INET6: | |
1599 | ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); | |
1600 | break; | |
1601 | default: | |
1602 | BUG(); | |
1603 | } | |
92200412 CL |
1604 | } |
1605 | ||
67a391d7 TM |
1606 | static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) |
1607 | { | |
1608 | unsigned short port = transport->port; | |
1609 | ||
1610 | if (port == 0 && transport->xprt.resvport) | |
1611 | port = xs_get_random_port(); | |
1612 | return port; | |
1613 | } | |
1614 | ||
1615 | static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) | |
1616 | { | |
1617 | if (transport->port != 0) | |
1618 | transport->port = 0; | |
1619 | if (!transport->xprt.resvport) | |
1620 | return 0; | |
1621 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1622 | return xprt_max_resvport; | |
1623 | return --port; | |
1624 | } | |
1625 | ||
7dc753f0 | 1626 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
a246b010 CL |
1627 | { |
1628 | struct sockaddr_in myaddr = { | |
1629 | .sin_family = AF_INET, | |
1630 | }; | |
d3bc9a1d | 1631 | struct sockaddr_in *sa; |
67a391d7 TM |
1632 | int err, nloop = 0; |
1633 | unsigned short port = xs_get_srcport(transport, sock); | |
1634 | unsigned short last; | |
a246b010 | 1635 | |
d3bc9a1d FM |
1636 | sa = (struct sockaddr_in *)&transport->addr; |
1637 | myaddr.sin_addr = sa->sin_addr; | |
a246b010 CL |
1638 | do { |
1639 | myaddr.sin_port = htons(port); | |
e6242e92 | 1640 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 | 1641 | sizeof(myaddr)); |
67a391d7 | 1642 | if (port == 0) |
d3bc9a1d | 1643 | break; |
a246b010 | 1644 | if (err == 0) { |
c8475461 | 1645 | transport->port = port; |
d3bc9a1d | 1646 | break; |
a246b010 | 1647 | } |
67a391d7 TM |
1648 | last = port; |
1649 | port = xs_next_srcport(transport, sock, port); | |
1650 | if (port > last) | |
1651 | nloop++; | |
1652 | } while (err == -EADDRINUSE && nloop != 2); | |
21454aaa HH |
1653 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", |
1654 | __func__, &myaddr.sin_addr, | |
7dc753f0 | 1655 | port, err ? "failed" : "ok", err); |
a246b010 CL |
1656 | return err; |
1657 | } | |
1658 | ||
90058d37 CL |
1659 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1660 | { | |
1661 | struct sockaddr_in6 myaddr = { | |
1662 | .sin6_family = AF_INET6, | |
1663 | }; | |
1664 | struct sockaddr_in6 *sa; | |
67a391d7 TM |
1665 | int err, nloop = 0; |
1666 | unsigned short port = xs_get_srcport(transport, sock); | |
1667 | unsigned short last; | |
90058d37 | 1668 | |
90058d37 CL |
1669 | sa = (struct sockaddr_in6 *)&transport->addr; |
1670 | myaddr.sin6_addr = sa->sin6_addr; | |
1671 | do { | |
1672 | myaddr.sin6_port = htons(port); | |
1673 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, | |
1674 | sizeof(myaddr)); | |
67a391d7 | 1675 | if (port == 0) |
90058d37 CL |
1676 | break; |
1677 | if (err == 0) { | |
1678 | transport->port = port; | |
1679 | break; | |
1680 | } | |
67a391d7 TM |
1681 | last = port; |
1682 | port = xs_next_srcport(transport, sock, port); | |
1683 | if (port > last) | |
1684 | nloop++; | |
1685 | } while (err == -EADDRINUSE && nloop != 2); | |
5b095d98 | 1686 | dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", |
fdb46ee7 | 1687 | &myaddr.sin6_addr, port, err ? "failed" : "ok", err); |
a246b010 CL |
1688 | return err; |
1689 | } | |
1690 | ||
ed07536e PZ |
1691 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1692 | static struct lock_class_key xs_key[2]; | |
1693 | static struct lock_class_key xs_slock_key[2]; | |
1694 | ||
8945ee5e | 1695 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1696 | { |
1697 | struct sock *sk = sock->sk; | |
8945ee5e | 1698 | |
02b3d346 | 1699 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1700 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1701 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1702 | } | |
ed07536e | 1703 | |
8945ee5e CL |
1704 | static inline void xs_reclassify_socket6(struct socket *sock) |
1705 | { | |
1706 | struct sock *sk = sock->sk; | |
ed07536e | 1707 | |
f4921aff | 1708 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1709 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1710 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e PZ |
1711 | } |
1712 | #else | |
8945ee5e CL |
1713 | static inline void xs_reclassify_socket4(struct socket *sock) |
1714 | { | |
1715 | } | |
1716 | ||
1717 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1718 | { |
1719 | } | |
1720 | #endif | |
1721 | ||
16be2d20 CL |
1722 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1723 | { | |
1724 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1725 | ||
1726 | if (!transport->inet) { | |
1727 | struct sock *sk = sock->sk; | |
1728 | ||
1729 | write_lock_bh(&sk->sk_callback_lock); | |
1730 | ||
2a9e1cfa TM |
1731 | xs_save_old_callbacks(transport, sk); |
1732 | ||
16be2d20 | 1733 | sk->sk_user_data = xprt; |
16be2d20 CL |
1734 | sk->sk_data_ready = xs_udp_data_ready; |
1735 | sk->sk_write_space = xs_udp_write_space; | |
482f32e6 | 1736 | sk->sk_error_report = xs_error_report; |
16be2d20 CL |
1737 | sk->sk_no_check = UDP_CSUM_NORCV; |
1738 | sk->sk_allocation = GFP_ATOMIC; | |
1739 | ||
1740 | xprt_set_connected(xprt); | |
1741 | ||
1742 | /* Reset to new socket */ | |
1743 | transport->sock = sock; | |
1744 | transport->inet = sk; | |
1745 | ||
1746 | write_unlock_bh(&sk->sk_callback_lock); | |
1747 | } | |
1748 | xs_udp_do_set_buffer_size(xprt); | |
1749 | } | |
1750 | ||
b0d93ad5 | 1751 | /** |
9c3d72de | 1752 | * xs_udp_connect_worker4 - set up a UDP socket |
65f27f38 | 1753 | * @work: RPC transport to connect |
b0d93ad5 CL |
1754 | * |
1755 | * Invoked by a work queue tasklet. | |
1756 | */ | |
9c3d72de | 1757 | static void xs_udp_connect_worker4(struct work_struct *work) |
a246b010 | 1758 | { |
34161db6 TM |
1759 | struct sock_xprt *transport = |
1760 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1761 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1762 | struct socket *sock = transport->sock; |
b0d93ad5 | 1763 | int err, status = -EIO; |
9903cd1c | 1764 | |
01d37c42 | 1765 | if (xprt->shutdown) |
b0d93ad5 | 1766 | goto out; |
9903cd1c | 1767 | |
b0d93ad5 | 1768 | /* Start by resetting any existing state */ |
fe315e76 | 1769 | xs_reset_transport(transport); |
9903cd1c | 1770 | |
fe315e76 CL |
1771 | err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1772 | if (err < 0) { | |
46121cf7 | 1773 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
b0d93ad5 CL |
1774 | goto out; |
1775 | } | |
8945ee5e | 1776 | xs_reclassify_socket4(sock); |
9903cd1c | 1777 | |
7dc753f0 | 1778 | if (xs_bind4(transport, sock)) { |
b0d93ad5 CL |
1779 | sock_release(sock); |
1780 | goto out; | |
1781 | } | |
9903cd1c | 1782 | |
46121cf7 | 1783 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
7559c7a2 | 1784 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1785 | |
16be2d20 | 1786 | xs_udp_finish_connecting(xprt, sock); |
b0d93ad5 CL |
1787 | status = 0; |
1788 | out: | |
b0d93ad5 | 1789 | xprt_clear_connecting(xprt); |
7d1e8255 | 1790 | xprt_wake_pending_tasks(xprt, status); |
a246b010 | 1791 | } |
a246b010 | 1792 | |
68e220bd CL |
1793 | /** |
1794 | * xs_udp_connect_worker6 - set up a UDP socket | |
1795 | * @work: RPC transport to connect | |
1796 | * | |
1797 | * Invoked by a work queue tasklet. | |
1798 | */ | |
1799 | static void xs_udp_connect_worker6(struct work_struct *work) | |
1800 | { | |
1801 | struct sock_xprt *transport = | |
1802 | container_of(work, struct sock_xprt, connect_worker.work); | |
1803 | struct rpc_xprt *xprt = &transport->xprt; | |
1804 | struct socket *sock = transport->sock; | |
1805 | int err, status = -EIO; | |
a246b010 | 1806 | |
01d37c42 | 1807 | if (xprt->shutdown) |
68e220bd | 1808 | goto out; |
b0d93ad5 | 1809 | |
68e220bd | 1810 | /* Start by resetting any existing state */ |
fe315e76 | 1811 | xs_reset_transport(transport); |
a246b010 | 1812 | |
fe315e76 CL |
1813 | err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1814 | if (err < 0) { | |
68e220bd CL |
1815 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1816 | goto out; | |
1817 | } | |
8945ee5e | 1818 | xs_reclassify_socket6(sock); |
a246b010 | 1819 | |
68e220bd CL |
1820 | if (xs_bind6(transport, sock) < 0) { |
1821 | sock_release(sock); | |
1822 | goto out; | |
b0d93ad5 | 1823 | } |
68e220bd CL |
1824 | |
1825 | dprintk("RPC: worker connecting xprt %p to address: %s\n", | |
1826 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); | |
1827 | ||
1828 | xs_udp_finish_connecting(xprt, sock); | |
b0d93ad5 CL |
1829 | status = 0; |
1830 | out: | |
b0d93ad5 | 1831 | xprt_clear_connecting(xprt); |
7d1e8255 | 1832 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
1833 | } |
1834 | ||
3167e12c CL |
1835 | /* |
1836 | * We need to preserve the port number so the reply cache on the server can | |
1837 | * find our cached RPC replies when we get around to reconnecting. | |
1838 | */ | |
40d2549d | 1839 | static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
3167e12c CL |
1840 | { |
1841 | int result; | |
3167e12c CL |
1842 | struct sockaddr any; |
1843 | ||
46121cf7 | 1844 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
3167e12c CL |
1845 | |
1846 | /* | |
1847 | * Disconnect the transport socket by doing a connect operation | |
1848 | * with AF_UNSPEC. This should return immediately... | |
1849 | */ | |
1850 | memset(&any, 0, sizeof(any)); | |
1851 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1852 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
7d1e8255 TM |
1853 | if (!result) |
1854 | xs_sock_mark_closed(xprt); | |
1855 | else | |
46121cf7 | 1856 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
1857 | result); |
1858 | } | |
1859 | ||
40d2549d TM |
1860 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1861 | { | |
1862 | unsigned int state = transport->inet->sk_state; | |
1863 | ||
1864 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) | |
1865 | return; | |
1866 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) | |
1867 | return; | |
1868 | xs_abort_connection(xprt, transport); | |
1869 | } | |
1870 | ||
16be2d20 | 1871 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 1872 | { |
16be2d20 | 1873 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
edb267a6 | 1874 | |
ee0ac0c2 | 1875 | if (!transport->inet) { |
b0d93ad5 CL |
1876 | struct sock *sk = sock->sk; |
1877 | ||
1878 | write_lock_bh(&sk->sk_callback_lock); | |
1879 | ||
2a9e1cfa TM |
1880 | xs_save_old_callbacks(transport, sk); |
1881 | ||
b0d93ad5 | 1882 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
1883 | sk->sk_data_ready = xs_tcp_data_ready; |
1884 | sk->sk_state_change = xs_tcp_state_change; | |
1885 | sk->sk_write_space = xs_tcp_write_space; | |
482f32e6 | 1886 | sk->sk_error_report = xs_error_report; |
b079fa7b | 1887 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1888 | |
1889 | /* socket options */ | |
1890 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1891 | sock_reset_flag(sk, SOCK_LINGER); | |
1892 | tcp_sk(sk)->linger2 = 0; | |
1893 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1894 | |
1895 | xprt_clear_connected(xprt); | |
1896 | ||
1897 | /* Reset to new socket */ | |
ee0ac0c2 CL |
1898 | transport->sock = sock; |
1899 | transport->inet = sk; | |
b0d93ad5 CL |
1900 | |
1901 | write_unlock_bh(&sk->sk_callback_lock); | |
1902 | } | |
1903 | ||
01d37c42 TM |
1904 | if (!xprt_bound(xprt)) |
1905 | return -ENOTCONN; | |
1906 | ||
b0d93ad5 | 1907 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
1908 | xprt->stat.connect_count++; |
1909 | xprt->stat.connect_start = jiffies; | |
95392c59 | 1910 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
16be2d20 CL |
1911 | } |
1912 | ||
9903cd1c | 1913 | /** |
b61d59ff TM |
1914 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
1915 | * @xprt: RPC transport to connect | |
1916 | * @transport: socket transport to connect | |
1917 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
1918 | * |
1919 | * Invoked by a work queue tasklet. | |
a246b010 | 1920 | */ |
b61d59ff TM |
1921 | static void xs_tcp_setup_socket(struct rpc_xprt *xprt, |
1922 | struct sock_xprt *transport, | |
1923 | struct socket *(*create_sock)(struct rpc_xprt *, | |
1924 | struct sock_xprt *)) | |
a246b010 | 1925 | { |
ee0ac0c2 | 1926 | struct socket *sock = transport->sock; |
b61d59ff | 1927 | int status = -EIO; |
a246b010 | 1928 | |
01d37c42 | 1929 | if (xprt->shutdown) |
a246b010 CL |
1930 | goto out; |
1931 | ||
ee0ac0c2 | 1932 | if (!sock) { |
7d1e8255 | 1933 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
b61d59ff TM |
1934 | sock = create_sock(xprt, transport); |
1935 | if (IS_ERR(sock)) { | |
1936 | status = PTR_ERR(sock); | |
3167e12c CL |
1937 | goto out; |
1938 | } | |
7d1e8255 TM |
1939 | } else { |
1940 | int abort_and_exit; | |
a246b010 | 1941 | |
7d1e8255 TM |
1942 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
1943 | &xprt->state); | |
3167e12c | 1944 | /* "close" the socket, preserving the local port */ |
40d2549d | 1945 | xs_tcp_reuse_connection(xprt, transport); |
a246b010 | 1946 | |
7d1e8255 TM |
1947 | if (abort_and_exit) |
1948 | goto out_eagain; | |
1949 | } | |
a246b010 | 1950 | |
46121cf7 | 1951 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
7559c7a2 | 1952 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1953 | |
16be2d20 | 1954 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 CL |
1955 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1956 | xprt, -status, xprt_connected(xprt), | |
1957 | sock->sk->sk_state); | |
2a491991 | 1958 | switch (status) { |
f75e6745 TM |
1959 | default: |
1960 | printk("%s: connect returned unhandled error %d\n", | |
1961 | __func__, status); | |
1962 | case -EADDRNOTAVAIL: | |
1963 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
1964 | * and retry | |
1965 | */ | |
1966 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
1967 | xprt_force_disconnect(xprt); | |
88b5ed73 | 1968 | break; |
8a2cec29 TM |
1969 | case -ECONNREFUSED: |
1970 | case -ECONNRESET: | |
1971 | case -ENETUNREACH: | |
1972 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
1973 | case 0: |
1974 | case -EINPROGRESS: | |
1975 | case -EALREADY: | |
7d1e8255 TM |
1976 | xprt_clear_connecting(xprt); |
1977 | return; | |
a246b010 | 1978 | } |
7d1e8255 | 1979 | out_eagain: |
2a491991 | 1980 | status = -EAGAIN; |
a246b010 | 1981 | out: |
68e220bd | 1982 | xprt_clear_connecting(xprt); |
7d1e8255 | 1983 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 1984 | } |
b0d93ad5 | 1985 | |
b61d59ff TM |
1986 | static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, |
1987 | struct sock_xprt *transport) | |
1988 | { | |
1989 | struct socket *sock; | |
1990 | int err; | |
1991 | ||
1992 | /* start from scratch */ | |
1993 | err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1994 | if (err < 0) { | |
1995 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
1996 | -err); | |
1997 | goto out_err; | |
1998 | } | |
1999 | xs_reclassify_socket4(sock); | |
2000 | ||
2001 | if (xs_bind4(transport, sock) < 0) { | |
2002 | sock_release(sock); | |
2003 | goto out_err; | |
2004 | } | |
2005 | return sock; | |
2006 | out_err: | |
2007 | return ERR_PTR(-EIO); | |
68e220bd | 2008 | } |
b0d93ad5 | 2009 | |
68e220bd | 2010 | /** |
b61d59ff | 2011 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
68e220bd CL |
2012 | * @work: RPC transport to connect |
2013 | * | |
2014 | * Invoked by a work queue tasklet. | |
2015 | */ | |
b61d59ff | 2016 | static void xs_tcp_connect_worker4(struct work_struct *work) |
68e220bd CL |
2017 | { |
2018 | struct sock_xprt *transport = | |
2019 | container_of(work, struct sock_xprt, connect_worker.work); | |
2020 | struct rpc_xprt *xprt = &transport->xprt; | |
3167e12c | 2021 | |
b61d59ff TM |
2022 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); |
2023 | } | |
b0d93ad5 | 2024 | |
b61d59ff TM |
2025 | static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, |
2026 | struct sock_xprt *transport) | |
2027 | { | |
2028 | struct socket *sock; | |
2029 | int err; | |
7d1e8255 | 2030 | |
b61d59ff TM |
2031 | /* start from scratch */ |
2032 | err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); | |
2033 | if (err < 0) { | |
2034 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
2035 | -err); | |
2036 | goto out_err; | |
2037 | } | |
2038 | xs_reclassify_socket6(sock); | |
b0d93ad5 | 2039 | |
b61d59ff TM |
2040 | if (xs_bind6(transport, sock) < 0) { |
2041 | sock_release(sock); | |
2042 | goto out_err; | |
7d1e8255 | 2043 | } |
b61d59ff TM |
2044 | return sock; |
2045 | out_err: | |
2046 | return ERR_PTR(-EIO); | |
2047 | } | |
b0d93ad5 | 2048 | |
b61d59ff TM |
2049 | /** |
2050 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint | |
2051 | * @work: RPC transport to connect | |
2052 | * | |
2053 | * Invoked by a work queue tasklet. | |
2054 | */ | |
2055 | static void xs_tcp_connect_worker6(struct work_struct *work) | |
2056 | { | |
2057 | struct sock_xprt *transport = | |
2058 | container_of(work, struct sock_xprt, connect_worker.work); | |
2059 | struct rpc_xprt *xprt = &transport->xprt; | |
b0d93ad5 | 2060 | |
b61d59ff | 2061 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); |
a246b010 CL |
2062 | } |
2063 | ||
9903cd1c CL |
2064 | /** |
2065 | * xs_connect - connect a socket to a remote endpoint | |
2066 | * @task: address of RPC task that manages state of connect request | |
2067 | * | |
2068 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2069 | * |
2070 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2071 | * to guarantee that even unprivileged user processes can set up a | |
2072 | * socket on a privileged port. | |
2073 | * | |
2074 | * If a UDP socket connect fails, the delay behavior here prevents | |
2075 | * retry floods (hard mounts). | |
9903cd1c CL |
2076 | */ |
2077 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
2078 | { |
2079 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 2080 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2081 | |
b0d93ad5 CL |
2082 | if (xprt_test_and_set_connecting(xprt)) |
2083 | return; | |
2084 | ||
ee0ac0c2 | 2085 | if (transport->sock != NULL) { |
46121cf7 CL |
2086 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2087 | "seconds\n", | |
03bf4b70 | 2088 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2089 | queue_delayed_work(rpciod_workqueue, |
2090 | &transport->connect_worker, | |
2091 | xprt->reestablish_timeout); | |
03bf4b70 CL |
2092 | xprt->reestablish_timeout <<= 1; |
2093 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) | |
2094 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2095 | } else { |
46121cf7 | 2096 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2097 | queue_delayed_work(rpciod_workqueue, |
2098 | &transport->connect_worker, 0); | |
a246b010 CL |
2099 | } |
2100 | } | |
2101 | ||
e06799f9 TM |
2102 | static void xs_tcp_connect(struct rpc_task *task) |
2103 | { | |
2104 | struct rpc_xprt *xprt = task->tk_xprt; | |
2105 | ||
e06799f9 TM |
2106 | /* Exit if we need to wait for socket shutdown to complete */ |
2107 | if (test_bit(XPRT_CLOSING, &xprt->state)) | |
2108 | return; | |
2109 | xs_connect(task); | |
2110 | } | |
2111 | ||
262ca07d CL |
2112 | /** |
2113 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2114 | * @xprt: rpc_xprt struct containing statistics | |
2115 | * @seq: output file | |
2116 | * | |
2117 | */ | |
2118 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2119 | { | |
c8475461 CL |
2120 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2121 | ||
262ca07d | 2122 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
c8475461 | 2123 | transport->port, |
262ca07d CL |
2124 | xprt->stat.bind_count, |
2125 | xprt->stat.sends, | |
2126 | xprt->stat.recvs, | |
2127 | xprt->stat.bad_xids, | |
2128 | xprt->stat.req_u, | |
2129 | xprt->stat.bklog_u); | |
2130 | } | |
2131 | ||
2132 | /** | |
2133 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2134 | * @xprt: rpc_xprt struct containing statistics | |
2135 | * @seq: output file | |
2136 | * | |
2137 | */ | |
2138 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2139 | { | |
c8475461 | 2140 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2141 | long idle_time = 0; |
2142 | ||
2143 | if (xprt_connected(xprt)) | |
2144 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2145 | ||
2146 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
c8475461 | 2147 | transport->port, |
262ca07d CL |
2148 | xprt->stat.bind_count, |
2149 | xprt->stat.connect_count, | |
2150 | xprt->stat.connect_time, | |
2151 | idle_time, | |
2152 | xprt->stat.sends, | |
2153 | xprt->stat.recvs, | |
2154 | xprt->stat.bad_xids, | |
2155 | xprt->stat.req_u, | |
2156 | xprt->stat.bklog_u); | |
2157 | } | |
2158 | ||
262965f5 | 2159 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2160 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2161 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2162 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 2163 | .rpcbind = rpcb_getport_async, |
92200412 | 2164 | .set_port = xs_set_port, |
262965f5 | 2165 | .connect = xs_connect, |
02107148 CL |
2166 | .buf_alloc = rpc_malloc, |
2167 | .buf_free = rpc_free, | |
262965f5 | 2168 | .send_request = xs_udp_send_request, |
fe3aca29 | 2169 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2170 | .timer = xs_udp_timer, |
a58dd398 | 2171 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2172 | .close = xs_close, |
2173 | .destroy = xs_destroy, | |
262ca07d | 2174 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2175 | }; |
2176 | ||
2177 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2178 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2179 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 2180 | .rpcbind = rpcb_getport_async, |
92200412 | 2181 | .set_port = xs_set_port, |
e06799f9 | 2182 | .connect = xs_tcp_connect, |
02107148 CL |
2183 | .buf_alloc = rpc_malloc, |
2184 | .buf_free = rpc_free, | |
262965f5 | 2185 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2186 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
0d90ba1c RL |
2187 | #if defined(CONFIG_NFS_V4_1) |
2188 | .release_request = bc_release_request, | |
2189 | #endif /* CONFIG_NFS_V4_1 */ | |
f75e6745 | 2190 | .close = xs_tcp_close, |
9903cd1c | 2191 | .destroy = xs_destroy, |
262ca07d | 2192 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2193 | }; |
2194 | ||
3c341b0b | 2195 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
bc25571e | 2196 | unsigned int slot_table_size) |
c8541ecd CL |
2197 | { |
2198 | struct rpc_xprt *xprt; | |
ffc2e518 | 2199 | struct sock_xprt *new; |
c8541ecd | 2200 | |
96802a09 | 2201 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2202 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2203 | return ERR_PTR(-EBADF); |
2204 | } | |
2205 | ||
ffc2e518 CL |
2206 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
2207 | if (new == NULL) { | |
46121cf7 CL |
2208 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2209 | "rpc_xprt\n"); | |
c8541ecd CL |
2210 | return ERR_PTR(-ENOMEM); |
2211 | } | |
ffc2e518 | 2212 | xprt = &new->xprt; |
c8541ecd CL |
2213 | |
2214 | xprt->max_reqs = slot_table_size; | |
2215 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); | |
2216 | if (xprt->slot == NULL) { | |
2217 | kfree(xprt); | |
46121cf7 CL |
2218 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
2219 | "table\n"); | |
c8541ecd CL |
2220 | return ERR_PTR(-ENOMEM); |
2221 | } | |
2222 | ||
96802a09 FM |
2223 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2224 | xprt->addrlen = args->addrlen; | |
d3bc9a1d FM |
2225 | if (args->srcaddr) |
2226 | memcpy(&new->addr, args->srcaddr, args->addrlen); | |
c8541ecd CL |
2227 | |
2228 | return xprt; | |
2229 | } | |
2230 | ||
2881ae74 TM |
2231 | static const struct rpc_timeout xs_udp_default_timeout = { |
2232 | .to_initval = 5 * HZ, | |
2233 | .to_maxval = 30 * HZ, | |
2234 | .to_increment = 5 * HZ, | |
2235 | .to_retries = 5, | |
2236 | }; | |
2237 | ||
9903cd1c CL |
2238 | /** |
2239 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2240 | * @args: rpc transport creation arguments |
9903cd1c CL |
2241 | * |
2242 | */ | |
483066d6 | 2243 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2244 | { |
8f9d5b1a | 2245 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2246 | struct rpc_xprt *xprt; |
c8475461 | 2247 | struct sock_xprt *transport; |
a246b010 | 2248 | |
96802a09 | 2249 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
2250 | if (IS_ERR(xprt)) |
2251 | return xprt; | |
c8475461 | 2252 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2253 | |
ec739ef0 | 2254 | xprt->prot = IPPROTO_UDP; |
808012fb | 2255 | xprt->tsh_size = 0; |
a246b010 CL |
2256 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2257 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2258 | ||
03bf4b70 CL |
2259 | xprt->bind_timeout = XS_BIND_TO; |
2260 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
2261 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
2262 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2263 | |
262965f5 | 2264 | xprt->ops = &xs_udp_ops; |
a246b010 | 2265 | |
ba7392bb | 2266 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2267 | |
8f9d5b1a CL |
2268 | switch (addr->sa_family) { |
2269 | case AF_INET: | |
2270 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2271 | xprt_set_bound(xprt); | |
2272 | ||
2273 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2274 | xs_udp_connect_worker4); | |
b454ae90 | 2275 | xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2276 | break; |
2277 | case AF_INET6: | |
2278 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2279 | xprt_set_bound(xprt); | |
2280 | ||
2281 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2282 | xs_udp_connect_worker6); | |
b454ae90 | 2283 | xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2284 | break; |
2285 | default: | |
2286 | kfree(xprt); | |
2287 | return ERR_PTR(-EAFNOSUPPORT); | |
2288 | } | |
2289 | ||
46121cf7 | 2290 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 2291 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 2292 | |
bc25571e TT |
2293 | if (try_module_get(THIS_MODULE)) |
2294 | return xprt; | |
2295 | ||
2296 | kfree(xprt->slot); | |
2297 | kfree(xprt); | |
2298 | return ERR_PTR(-EINVAL); | |
a246b010 CL |
2299 | } |
2300 | ||
2881ae74 TM |
2301 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2302 | .to_initval = 60 * HZ, | |
2303 | .to_maxval = 60 * HZ, | |
2304 | .to_retries = 2, | |
2305 | }; | |
2306 | ||
9903cd1c CL |
2307 | /** |
2308 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2309 | * @args: rpc transport creation arguments |
9903cd1c CL |
2310 | * |
2311 | */ | |
483066d6 | 2312 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2313 | { |
8f9d5b1a | 2314 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2315 | struct rpc_xprt *xprt; |
c8475461 | 2316 | struct sock_xprt *transport; |
a246b010 | 2317 | |
96802a09 | 2318 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
2319 | if (IS_ERR(xprt)) |
2320 | return xprt; | |
c8475461 | 2321 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2322 | |
ec739ef0 | 2323 | xprt->prot = IPPROTO_TCP; |
808012fb | 2324 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2325 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2326 | |
03bf4b70 CL |
2327 | xprt->bind_timeout = XS_BIND_TO; |
2328 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
2329 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2330 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2331 | |
262965f5 | 2332 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2333 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2334 | |
8f9d5b1a CL |
2335 | switch (addr->sa_family) { |
2336 | case AF_INET: | |
2337 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2338 | xprt_set_bound(xprt); | |
2339 | ||
2340 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); | |
b454ae90 | 2341 | xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2342 | break; |
2343 | case AF_INET6: | |
2344 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2345 | xprt_set_bound(xprt); | |
2346 | ||
2347 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); | |
b454ae90 | 2348 | xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2349 | break; |
2350 | default: | |
2351 | kfree(xprt); | |
2352 | return ERR_PTR(-EAFNOSUPPORT); | |
2353 | } | |
2354 | ||
46121cf7 | 2355 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 2356 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 2357 | |
bc25571e TT |
2358 | if (try_module_get(THIS_MODULE)) |
2359 | return xprt; | |
2360 | ||
2361 | kfree(xprt->slot); | |
2362 | kfree(xprt); | |
2363 | return ERR_PTR(-EINVAL); | |
a246b010 | 2364 | } |
282b32e1 | 2365 | |
bc25571e TT |
2366 | static struct xprt_class xs_udp_transport = { |
2367 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2368 | .name = "udp", | |
2369 | .owner = THIS_MODULE, | |
4fa016eb | 2370 | .ident = IPPROTO_UDP, |
bc25571e TT |
2371 | .setup = xs_setup_udp, |
2372 | }; | |
2373 | ||
2374 | static struct xprt_class xs_tcp_transport = { | |
2375 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2376 | .name = "tcp", | |
2377 | .owner = THIS_MODULE, | |
4fa016eb | 2378 | .ident = IPPROTO_TCP, |
bc25571e TT |
2379 | .setup = xs_setup_tcp, |
2380 | }; | |
2381 | ||
282b32e1 | 2382 | /** |
bc25571e | 2383 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2384 | * |
2385 | */ | |
2386 | int init_socket_xprt(void) | |
2387 | { | |
fbf76683 | 2388 | #ifdef RPC_DEBUG |
2b1bec5f | 2389 | if (!sunrpc_table_header) |
0b4d4147 | 2390 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2391 | #endif |
2392 | ||
bc25571e TT |
2393 | xprt_register_transport(&xs_udp_transport); |
2394 | xprt_register_transport(&xs_tcp_transport); | |
2395 | ||
282b32e1 CL |
2396 | return 0; |
2397 | } | |
2398 | ||
2399 | /** | |
bc25571e | 2400 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2401 | * |
2402 | */ | |
2403 | void cleanup_socket_xprt(void) | |
2404 | { | |
fbf76683 CL |
2405 | #ifdef RPC_DEBUG |
2406 | if (sunrpc_table_header) { | |
2407 | unregister_sysctl_table(sunrpc_table_header); | |
2408 | sunrpc_table_header = NULL; | |
2409 | } | |
2410 | #endif | |
bc25571e TT |
2411 | |
2412 | xprt_unregister_transport(&xs_udp_transport); | |
2413 | xprt_unregister_transport(&xs_tcp_transport); | |
282b32e1 | 2414 | } |
cbf11071 TM |
2415 | |
2416 | static int param_set_uint_minmax(const char *val, struct kernel_param *kp, | |
2417 | unsigned int min, unsigned int max) | |
2418 | { | |
2419 | unsigned long num; | |
2420 | int ret; | |
2421 | ||
2422 | if (!val) | |
2423 | return -EINVAL; | |
2424 | ret = strict_strtoul(val, 0, &num); | |
2425 | if (ret == -EINVAL || num < min || num > max) | |
2426 | return -EINVAL; | |
2427 | *((unsigned int *)kp->arg) = num; | |
2428 | return 0; | |
2429 | } | |
2430 | ||
2431 | static int param_set_portnr(const char *val, struct kernel_param *kp) | |
2432 | { | |
2433 | return param_set_uint_minmax(val, kp, | |
2434 | RPC_MIN_RESVPORT, | |
2435 | RPC_MAX_RESVPORT); | |
2436 | } | |
2437 | ||
2438 | static int param_get_portnr(char *buffer, struct kernel_param *kp) | |
2439 | { | |
2440 | return param_get_uint(buffer, kp); | |
2441 | } | |
2442 | #define param_check_portnr(name, p) \ | |
2443 | __param_check(name, p, unsigned int); | |
2444 | ||
2445 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
2446 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
2447 | ||
2448 | static int param_set_slot_table_size(const char *val, struct kernel_param *kp) | |
2449 | { | |
2450 | return param_set_uint_minmax(val, kp, | |
2451 | RPC_MIN_SLOT_TABLE, | |
2452 | RPC_MAX_SLOT_TABLE); | |
2453 | } | |
2454 | ||
2455 | static int param_get_slot_table_size(char *buffer, struct kernel_param *kp) | |
2456 | { | |
2457 | return param_get_uint(buffer, kp); | |
2458 | } | |
2459 | #define param_check_slot_table_size(name, p) \ | |
2460 | __param_check(name, p, unsigned int); | |
2461 | ||
2462 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, | |
2463 | slot_table_size, 0644); | |
2464 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, | |
2465 | slot_table_size, 0644); | |
2466 |