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> |
4cfc7e60 | 35 | #include <linux/sunrpc/svcsock.h> |
49c36fcc | 36 | #include <linux/sunrpc/xprtsock.h> |
a246b010 | 37 | #include <linux/file.h> |
44b98efd RL |
38 | #ifdef CONFIG_NFS_V4_1 |
39 | #include <linux/sunrpc/bc_xprt.h> | |
40 | #endif | |
a246b010 CL |
41 | |
42 | #include <net/sock.h> | |
43 | #include <net/checksum.h> | |
44 | #include <net/udp.h> | |
45 | #include <net/tcp.h> | |
46 | ||
4cfc7e60 | 47 | #include "sunrpc.h" |
c556b754 CL |
48 | /* |
49 | * xprtsock tunables | |
50 | */ | |
51 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
52 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
53 | ||
54 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
55 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
56 | ||
7d1e8255 | 57 | #define XS_TCP_LINGER_TO (15U * HZ) |
25fe6142 | 58 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
7d1e8255 | 59 | |
fbf76683 CL |
60 | /* |
61 | * We can register our own files under /proc/sys/sunrpc by | |
62 | * calling register_sysctl_table() again. The files in that | |
63 | * directory become the union of all files registered there. | |
64 | * | |
65 | * We simply need to make sure that we don't collide with | |
66 | * someone else's file names! | |
67 | */ | |
68 | ||
69 | #ifdef RPC_DEBUG | |
70 | ||
71 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
72 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
73 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; | |
74 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
75 | ||
76 | static struct ctl_table_header *sunrpc_table_header; | |
77 | ||
78 | /* | |
79 | * FIXME: changing the UDP slot table size should also resize the UDP | |
80 | * socket buffers for existing UDP transports | |
81 | */ | |
82 | static ctl_table xs_tunables_table[] = { | |
83 | { | |
84 | .ctl_name = CTL_SLOTTABLE_UDP, | |
85 | .procname = "udp_slot_table_entries", | |
86 | .data = &xprt_udp_slot_table_entries, | |
87 | .maxlen = sizeof(unsigned int), | |
88 | .mode = 0644, | |
89 | .proc_handler = &proc_dointvec_minmax, | |
90 | .strategy = &sysctl_intvec, | |
91 | .extra1 = &min_slot_table_size, | |
92 | .extra2 = &max_slot_table_size | |
93 | }, | |
94 | { | |
95 | .ctl_name = CTL_SLOTTABLE_TCP, | |
96 | .procname = "tcp_slot_table_entries", | |
97 | .data = &xprt_tcp_slot_table_entries, | |
98 | .maxlen = sizeof(unsigned int), | |
99 | .mode = 0644, | |
100 | .proc_handler = &proc_dointvec_minmax, | |
101 | .strategy = &sysctl_intvec, | |
102 | .extra1 = &min_slot_table_size, | |
103 | .extra2 = &max_slot_table_size | |
104 | }, | |
105 | { | |
106 | .ctl_name = CTL_MIN_RESVPORT, | |
107 | .procname = "min_resvport", | |
108 | .data = &xprt_min_resvport, | |
109 | .maxlen = sizeof(unsigned int), | |
110 | .mode = 0644, | |
111 | .proc_handler = &proc_dointvec_minmax, | |
112 | .strategy = &sysctl_intvec, | |
113 | .extra1 = &xprt_min_resvport_limit, | |
114 | .extra2 = &xprt_max_resvport_limit | |
115 | }, | |
116 | { | |
117 | .ctl_name = CTL_MAX_RESVPORT, | |
118 | .procname = "max_resvport", | |
119 | .data = &xprt_max_resvport, | |
120 | .maxlen = sizeof(unsigned int), | |
121 | .mode = 0644, | |
122 | .proc_handler = &proc_dointvec_minmax, | |
123 | .strategy = &sysctl_intvec, | |
124 | .extra1 = &xprt_min_resvport_limit, | |
125 | .extra2 = &xprt_max_resvport_limit | |
126 | }, | |
25fe6142 TM |
127 | { |
128 | .procname = "tcp_fin_timeout", | |
129 | .data = &xs_tcp_fin_timeout, | |
130 | .maxlen = sizeof(xs_tcp_fin_timeout), | |
131 | .mode = 0644, | |
132 | .proc_handler = &proc_dointvec_jiffies, | |
133 | .strategy = sysctl_jiffies | |
134 | }, | |
fbf76683 CL |
135 | { |
136 | .ctl_name = 0, | |
137 | }, | |
138 | }; | |
139 | ||
140 | static ctl_table sunrpc_table[] = { | |
141 | { | |
142 | .ctl_name = CTL_SUNRPC, | |
143 | .procname = "sunrpc", | |
144 | .mode = 0555, | |
145 | .child = xs_tunables_table | |
146 | }, | |
147 | { | |
148 | .ctl_name = 0, | |
149 | }, | |
150 | }; | |
151 | ||
152 | #endif | |
153 | ||
03bf4b70 CL |
154 | /* |
155 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
156 | * synchronous, but we set a timeout anyway in case of resource | |
157 | * exhaustion on the local host. | |
158 | */ | |
159 | #define XS_UDP_CONN_TO (5U * HZ) | |
160 | ||
161 | /* | |
162 | * Wait duration for an RPC TCP connection to be established. Solaris | |
163 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
164 | * long a server takes to reboot. | |
165 | */ | |
166 | #define XS_TCP_CONN_TO (60U * HZ) | |
167 | ||
168 | /* | |
169 | * Wait duration for a reply from the RPC portmapper. | |
170 | */ | |
171 | #define XS_BIND_TO (60U * HZ) | |
172 | ||
173 | /* | |
174 | * Delay if a UDP socket connect error occurs. This is most likely some | |
175 | * kind of resource problem on the local host. | |
176 | */ | |
177 | #define XS_UDP_REEST_TO (2U * HZ) | |
178 | ||
179 | /* | |
180 | * The reestablish timeout allows clients to delay for a bit before attempting | |
181 | * to reconnect to a server that just dropped our connection. | |
182 | * | |
183 | * We implement an exponential backoff when trying to reestablish a TCP | |
184 | * transport connection with the server. Some servers like to drop a TCP | |
185 | * connection when they are overworked, so we start with a short timeout and | |
186 | * increase over time if the server is down or not responding. | |
187 | */ | |
188 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
189 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
190 | ||
191 | /* | |
192 | * TCP idle timeout; client drops the transport socket if it is idle | |
193 | * for this long. Note that we also timeout UDP sockets to prevent | |
194 | * holding port numbers when there is no RPC traffic. | |
195 | */ | |
196 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
197 | ||
a246b010 CL |
198 | #ifdef RPC_DEBUG |
199 | # undef RPC_DEBUG_DATA | |
9903cd1c | 200 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
201 | #endif |
202 | ||
a246b010 | 203 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 204 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 205 | { |
9903cd1c CL |
206 | u8 *buf = (u8 *) packet; |
207 | int j; | |
a246b010 | 208 | |
46121cf7 | 209 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
210 | for (j = 0; j < count && j < 128; j += 4) { |
211 | if (!(j & 31)) { | |
212 | if (j) | |
213 | dprintk("\n"); | |
214 | dprintk("0x%04x ", j); | |
215 | } | |
216 | dprintk("%02x%02x%02x%02x ", | |
217 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
218 | } | |
219 | dprintk("\n"); | |
220 | } | |
221 | #else | |
9903cd1c | 222 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
223 | { |
224 | /* NOP */ | |
225 | } | |
226 | #endif | |
227 | ||
ffc2e518 CL |
228 | struct sock_xprt { |
229 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
230 | |
231 | /* | |
232 | * Network layer | |
233 | */ | |
234 | struct socket * sock; | |
235 | struct sock * inet; | |
51971139 CL |
236 | |
237 | /* | |
238 | * State of TCP reply receive | |
239 | */ | |
240 | __be32 tcp_fraghdr, | |
241 | tcp_xid; | |
242 | ||
243 | u32 tcp_offset, | |
244 | tcp_reclen; | |
245 | ||
246 | unsigned long tcp_copied, | |
247 | tcp_flags; | |
c8475461 CL |
248 | |
249 | /* | |
250 | * Connection of transports | |
251 | */ | |
34161db6 | 252 | struct delayed_work connect_worker; |
fbfffbd5 CL |
253 | struct sockaddr_storage srcaddr; |
254 | unsigned short srcport; | |
7c6e066e CL |
255 | |
256 | /* | |
257 | * UDP socket buffer size parameters | |
258 | */ | |
259 | size_t rcvsize, | |
260 | sndsize; | |
314dfd79 CL |
261 | |
262 | /* | |
263 | * Saved socket callback addresses | |
264 | */ | |
265 | void (*old_data_ready)(struct sock *, int); | |
266 | void (*old_state_change)(struct sock *); | |
267 | void (*old_write_space)(struct sock *); | |
2a9e1cfa | 268 | void (*old_error_report)(struct sock *); |
ffc2e518 CL |
269 | }; |
270 | ||
e136d092 CL |
271 | /* |
272 | * TCP receive state flags | |
273 | */ | |
274 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
275 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
276 | #define TCP_RCV_COPY_XID (1UL << 2) | |
277 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
278 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
279 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
280 | |
281 | /* | |
282 | * TCP RPC flags | |
283 | */ | |
f4a2e418 | 284 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 285 | |
95392c59 CL |
286 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
287 | { | |
288 | return (struct sockaddr *) &xprt->addr; | |
289 | } | |
290 | ||
291 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) | |
edb267a6 | 292 | { |
95392c59 CL |
293 | return (struct sockaddr_in *) &xprt->addr; |
294 | } | |
295 | ||
296 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
297 | { | |
298 | return (struct sockaddr_in6 *) &xprt->addr; | |
299 | } | |
300 | ||
c877b849 | 301 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 302 | { |
c877b849 | 303 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
304 | struct sockaddr_in6 *sin6; |
305 | struct sockaddr_in *sin; | |
c877b849 | 306 | char buf[128]; |
edb267a6 | 307 | |
c877b849 CL |
308 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
309 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
fbfe3cc6 | 310 | |
9dc3b095 CL |
311 | switch (sap->sa_family) { |
312 | case AF_INET: | |
313 | sin = xs_addr_in(xprt); | |
314 | (void)snprintf(buf, sizeof(buf), "%02x%02x%02x%02x", | |
315 | NIPQUAD(sin->sin_addr.s_addr)); | |
316 | break; | |
317 | case AF_INET6: | |
318 | sin6 = xs_addr_in6(xprt); | |
319 | (void)snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); | |
320 | break; | |
321 | default: | |
322 | BUG(); | |
756805e7 | 323 | } |
9dc3b095 | 324 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
325 | } |
326 | ||
9dc3b095 | 327 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 328 | { |
9dc3b095 CL |
329 | struct sockaddr *sap = xs_addr(xprt); |
330 | char buf[128]; | |
4b6473fb | 331 | |
c877b849 CL |
332 | (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
333 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); | |
4b6473fb | 334 | |
c877b849 CL |
335 | (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
336 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); | |
337 | } | |
4b6473fb | 338 | |
9dc3b095 CL |
339 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
340 | const char *protocol, | |
341 | const char *netid) | |
c877b849 | 342 | { |
b454ae90 | 343 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 344 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 345 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 346 | xs_format_common_peer_ports(xprt); |
edb267a6 | 347 | } |
4b6473fb | 348 | |
9dc3b095 | 349 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 350 | { |
9dc3b095 CL |
351 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
352 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 353 | |
9dc3b095 | 354 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
355 | } |
356 | ||
357 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
358 | { | |
33e01dc7 CL |
359 | unsigned int i; |
360 | ||
361 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
362 | switch (i) { | |
363 | case RPC_DISPLAY_PROTO: | |
364 | case RPC_DISPLAY_NETID: | |
365 | continue; | |
366 | default: | |
367 | kfree(xprt->address_strings[i]); | |
368 | } | |
edb267a6 CL |
369 | } |
370 | ||
b4b5cc85 CL |
371 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
372 | ||
24c5684b | 373 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 374 | { |
b4b5cc85 CL |
375 | struct msghdr msg = { |
376 | .msg_name = addr, | |
377 | .msg_namelen = addrlen, | |
24c5684b TM |
378 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
379 | }; | |
380 | struct kvec iov = { | |
381 | .iov_base = vec->iov_base + base, | |
382 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
383 | }; |
384 | ||
24c5684b | 385 | if (iov.iov_len != 0) |
b4b5cc85 CL |
386 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
387 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
388 | } | |
389 | ||
24c5684b | 390 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 391 | { |
24c5684b TM |
392 | struct page **ppage; |
393 | unsigned int remainder; | |
394 | int err, sent = 0; | |
395 | ||
396 | remainder = xdr->page_len - base; | |
397 | base += xdr->page_base; | |
398 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
399 | base &= ~PAGE_MASK; | |
400 | for(;;) { | |
401 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
402 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 403 | |
24c5684b TM |
404 | remainder -= len; |
405 | if (remainder != 0 || more) | |
406 | flags |= MSG_MORE; | |
407 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
408 | if (remainder == 0 || err != len) | |
409 | break; | |
410 | sent += err; | |
411 | ppage++; | |
412 | base = 0; | |
413 | } | |
414 | if (sent == 0) | |
415 | return err; | |
416 | if (err > 0) | |
417 | sent += err; | |
418 | return sent; | |
b4b5cc85 CL |
419 | } |
420 | ||
9903cd1c CL |
421 | /** |
422 | * xs_sendpages - write pages directly to a socket | |
423 | * @sock: socket to send on | |
424 | * @addr: UDP only -- address of destination | |
425 | * @addrlen: UDP only -- length of destination address | |
426 | * @xdr: buffer containing this request | |
427 | * @base: starting position in the buffer | |
428 | * | |
a246b010 | 429 | */ |
24c5684b | 430 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 431 | { |
24c5684b TM |
432 | unsigned int remainder = xdr->len - base; |
433 | int err, sent = 0; | |
a246b010 | 434 | |
262965f5 | 435 | if (unlikely(!sock)) |
fba91afb | 436 | return -ENOTSOCK; |
262965f5 CL |
437 | |
438 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
439 | if (base != 0) { |
440 | addr = NULL; | |
441 | addrlen = 0; | |
442 | } | |
262965f5 | 443 | |
24c5684b TM |
444 | if (base < xdr->head[0].iov_len || addr != NULL) { |
445 | unsigned int len = xdr->head[0].iov_len - base; | |
446 | remainder -= len; | |
447 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
448 | if (remainder == 0 || err != len) | |
a246b010 | 449 | goto out; |
24c5684b | 450 | sent += err; |
a246b010 CL |
451 | base = 0; |
452 | } else | |
24c5684b | 453 | base -= xdr->head[0].iov_len; |
a246b010 | 454 | |
24c5684b TM |
455 | if (base < xdr->page_len) { |
456 | unsigned int len = xdr->page_len - base; | |
457 | remainder -= len; | |
458 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
459 | if (remainder == 0 || err != len) | |
a246b010 | 460 | goto out; |
24c5684b | 461 | sent += err; |
a246b010 | 462 | base = 0; |
24c5684b TM |
463 | } else |
464 | base -= xdr->page_len; | |
465 | ||
466 | if (base >= xdr->tail[0].iov_len) | |
467 | return sent; | |
468 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 469 | out: |
24c5684b TM |
470 | if (sent == 0) |
471 | return err; | |
472 | if (err > 0) | |
473 | sent += err; | |
474 | return sent; | |
a246b010 CL |
475 | } |
476 | ||
b6ddf64f TM |
477 | static void xs_nospace_callback(struct rpc_task *task) |
478 | { | |
479 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
480 | ||
481 | transport->inet->sk_write_pending--; | |
482 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
483 | } | |
484 | ||
9903cd1c | 485 | /** |
262965f5 CL |
486 | * xs_nospace - place task on wait queue if transmit was incomplete |
487 | * @task: task to put to sleep | |
9903cd1c | 488 | * |
a246b010 | 489 | */ |
5e3771ce | 490 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 491 | { |
262965f5 CL |
492 | struct rpc_rqst *req = task->tk_rqstp; |
493 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 494 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
5e3771ce | 495 | int ret = 0; |
a246b010 | 496 | |
46121cf7 | 497 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
498 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
499 | req->rq_slen); | |
500 | ||
b6ddf64f TM |
501 | /* Protect against races with write_space */ |
502 | spin_lock_bh(&xprt->transport_lock); | |
503 | ||
504 | /* Don't race with disconnect */ | |
505 | if (xprt_connected(xprt)) { | |
506 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
5e3771ce | 507 | ret = -EAGAIN; |
b6ddf64f TM |
508 | /* |
509 | * Notify TCP that we're limited by the application | |
510 | * window size | |
511 | */ | |
512 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
513 | transport->inet->sk_write_pending++; | |
514 | /* ...and wait for more buffer space */ | |
515 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
516 | } | |
517 | } else { | |
518 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 519 | ret = -ENOTCONN; |
b6ddf64f | 520 | } |
262965f5 | 521 | |
b6ddf64f | 522 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 523 | return ret; |
262965f5 CL |
524 | } |
525 | ||
526 | /** | |
527 | * xs_udp_send_request - write an RPC request to a UDP socket | |
528 | * @task: address of RPC task that manages the state of an RPC request | |
529 | * | |
530 | * Return values: | |
531 | * 0: The request has been sent | |
532 | * EAGAIN: The socket was blocked, please call again later to | |
533 | * complete the request | |
534 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
535 | * other: Some other error occured, the request was not sent | |
536 | */ | |
537 | static int xs_udp_send_request(struct rpc_task *task) | |
538 | { | |
539 | struct rpc_rqst *req = task->tk_rqstp; | |
540 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 541 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
542 | struct xdr_buf *xdr = &req->rq_snd_buf; |
543 | int status; | |
a246b010 | 544 | |
9903cd1c | 545 | xs_pktdump("packet data:", |
a246b010 CL |
546 | req->rq_svec->iov_base, |
547 | req->rq_svec->iov_len); | |
548 | ||
01d37c42 TM |
549 | if (!xprt_bound(xprt)) |
550 | return -ENOTCONN; | |
ee0ac0c2 | 551 | status = xs_sendpages(transport->sock, |
95392c59 | 552 | xs_addr(xprt), |
ee0ac0c2 CL |
553 | xprt->addrlen, xdr, |
554 | req->rq_bytes_sent); | |
a246b010 | 555 | |
46121cf7 | 556 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 557 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 558 | |
2199700f TM |
559 | if (status >= 0) { |
560 | task->tk_bytes_sent += status; | |
561 | if (status >= req->rq_slen) | |
562 | return 0; | |
563 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 564 | status = -EAGAIN; |
2199700f | 565 | } |
c8485e4d TM |
566 | if (!transport->sock) |
567 | goto out; | |
a246b010 | 568 | |
262965f5 | 569 | switch (status) { |
fba91afb TM |
570 | case -ENOTSOCK: |
571 | status = -ENOTCONN; | |
572 | /* Should we call xs_close() here? */ | |
573 | break; | |
b6ddf64f | 574 | case -EAGAIN: |
5e3771ce | 575 | status = xs_nospace(task); |
b6ddf64f | 576 | break; |
c8485e4d TM |
577 | default: |
578 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
579 | -status); | |
262965f5 CL |
580 | case -ENETUNREACH: |
581 | case -EPIPE: | |
a246b010 CL |
582 | case -ECONNREFUSED: |
583 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 584 | * prompts ECONNREFUSED. */ |
b6ddf64f | 585 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 586 | } |
c8485e4d | 587 | out: |
262965f5 | 588 | return status; |
a246b010 CL |
589 | } |
590 | ||
e06799f9 TM |
591 | /** |
592 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
593 | * @xprt: transport | |
594 | * | |
595 | * Initiates a graceful shutdown of the TCP socket by calling the | |
596 | * equivalent of shutdown(SHUT_WR); | |
597 | */ | |
598 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
599 | { | |
600 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
601 | struct socket *sock = transport->sock; | |
602 | ||
603 | if (sock != NULL) | |
604 | kernel_sock_shutdown(sock, SHUT_WR); | |
605 | } | |
606 | ||
808012fb CL |
607 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
608 | { | |
609 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
610 | rpc_fraghdr *base = buf->head[0].iov_base; | |
611 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
612 | } | |
613 | ||
9903cd1c | 614 | /** |
262965f5 | 615 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
616 | * @task: address of RPC task that manages the state of an RPC request |
617 | * | |
618 | * Return values: | |
262965f5 CL |
619 | * 0: The request has been sent |
620 | * EAGAIN: The socket was blocked, please call again later to | |
621 | * complete the request | |
622 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
623 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
624 | * |
625 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 626 | * if sendmsg is not able to make progress? |
9903cd1c | 627 | */ |
262965f5 | 628 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
629 | { |
630 | struct rpc_rqst *req = task->tk_rqstp; | |
631 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 632 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 633 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 634 | int status; |
a246b010 | 635 | |
808012fb | 636 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 637 | |
262965f5 CL |
638 | xs_pktdump("packet data:", |
639 | req->rq_svec->iov_base, | |
640 | req->rq_svec->iov_len); | |
a246b010 CL |
641 | |
642 | /* Continue transmitting the packet/record. We must be careful | |
643 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 644 | * called sendmsg(). */ |
a246b010 | 645 | while (1) { |
ee0ac0c2 CL |
646 | status = xs_sendpages(transport->sock, |
647 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 648 | |
46121cf7 | 649 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 650 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 651 | |
262965f5 | 652 | if (unlikely(status < 0)) |
a246b010 | 653 | break; |
a246b010 | 654 | |
262965f5 CL |
655 | /* If we've sent the entire packet, immediately |
656 | * reset the count of bytes sent. */ | |
657 | req->rq_bytes_sent += status; | |
ef759a2e | 658 | task->tk_bytes_sent += status; |
262965f5 CL |
659 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
660 | req->rq_bytes_sent = 0; | |
661 | return 0; | |
662 | } | |
a246b010 | 663 | |
06b4b681 TM |
664 | if (status != 0) |
665 | continue; | |
a246b010 | 666 | status = -EAGAIN; |
06b4b681 | 667 | break; |
a246b010 | 668 | } |
c8485e4d TM |
669 | if (!transport->sock) |
670 | goto out; | |
a246b010 | 671 | |
262965f5 | 672 | switch (status) { |
fba91afb TM |
673 | case -ENOTSOCK: |
674 | status = -ENOTCONN; | |
675 | /* Should we call xs_close() here? */ | |
676 | break; | |
262965f5 | 677 | case -EAGAIN: |
5e3771ce | 678 | status = xs_nospace(task); |
262965f5 | 679 | break; |
c8485e4d TM |
680 | default: |
681 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
682 | -status); | |
262965f5 | 683 | case -ECONNRESET: |
55420c24 | 684 | case -EPIPE: |
2a9e1cfa TM |
685 | xs_tcp_shutdown(xprt); |
686 | case -ECONNREFUSED: | |
262965f5 | 687 | case -ENOTCONN: |
b6ddf64f | 688 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 689 | } |
c8485e4d | 690 | out: |
a246b010 CL |
691 | return status; |
692 | } | |
693 | ||
e0ab53de TM |
694 | /** |
695 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
696 | * @xprt: transport | |
697 | * @task: rpc task | |
698 | * | |
699 | * This cleans up if an error causes us to abort the transmission of a request. | |
700 | * In this case, the socket may need to be reset in order to avoid confusing | |
701 | * the server. | |
702 | */ | |
703 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
704 | { | |
705 | struct rpc_rqst *req; | |
706 | ||
707 | if (task != xprt->snd_task) | |
708 | return; | |
709 | if (task == NULL) | |
710 | goto out_release; | |
711 | req = task->tk_rqstp; | |
712 | if (req->rq_bytes_sent == 0) | |
713 | goto out_release; | |
714 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
715 | goto out_release; | |
716 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
717 | out_release: | |
718 | xprt_release_xprt(xprt, task); | |
719 | } | |
720 | ||
2a9e1cfa TM |
721 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
722 | { | |
723 | transport->old_data_ready = sk->sk_data_ready; | |
724 | transport->old_state_change = sk->sk_state_change; | |
725 | transport->old_write_space = sk->sk_write_space; | |
726 | transport->old_error_report = sk->sk_error_report; | |
727 | } | |
728 | ||
729 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
730 | { | |
731 | sk->sk_data_ready = transport->old_data_ready; | |
732 | sk->sk_state_change = transport->old_state_change; | |
733 | sk->sk_write_space = transport->old_write_space; | |
734 | sk->sk_error_report = transport->old_error_report; | |
735 | } | |
736 | ||
fe315e76 | 737 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 738 | { |
ee0ac0c2 CL |
739 | struct socket *sock = transport->sock; |
740 | struct sock *sk = transport->inet; | |
a246b010 | 741 | |
fe315e76 CL |
742 | if (sk == NULL) |
743 | return; | |
9903cd1c | 744 | |
a246b010 | 745 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
746 | transport->inet = NULL; |
747 | transport->sock = NULL; | |
a246b010 | 748 | |
9903cd1c | 749 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
750 | |
751 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
752 | write_unlock_bh(&sk->sk_callback_lock); |
753 | ||
9903cd1c | 754 | sk->sk_no_check = 0; |
a246b010 CL |
755 | |
756 | sock_release(sock); | |
fe315e76 CL |
757 | } |
758 | ||
759 | /** | |
760 | * xs_close - close a socket | |
761 | * @xprt: transport | |
762 | * | |
763 | * This is used when all requests are complete; ie, no DRC state remains | |
764 | * on the server we want to save. | |
f75e6745 TM |
765 | * |
766 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
767 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
768 | */ |
769 | static void xs_close(struct rpc_xprt *xprt) | |
770 | { | |
771 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
772 | ||
773 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
774 | ||
775 | xs_reset_transport(transport); | |
61d0a8e6 | 776 | xprt->reestablish_timeout = 0; |
fe315e76 | 777 | |
632e3bdc | 778 | smp_mb__before_clear_bit(); |
7d1e8255 | 779 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 780 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 781 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 782 | smp_mb__after_clear_bit(); |
62da3b24 | 783 | xprt_disconnect_done(xprt); |
a246b010 CL |
784 | } |
785 | ||
f75e6745 TM |
786 | static void xs_tcp_close(struct rpc_xprt *xprt) |
787 | { | |
788 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
789 | xs_close(xprt); | |
790 | else | |
791 | xs_tcp_shutdown(xprt); | |
792 | } | |
793 | ||
9903cd1c CL |
794 | /** |
795 | * xs_destroy - prepare to shutdown a transport | |
796 | * @xprt: doomed transport | |
797 | * | |
798 | */ | |
799 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 800 | { |
c8475461 CL |
801 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
802 | ||
46121cf7 | 803 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 804 | |
c1384c9c | 805 | cancel_rearming_delayed_work(&transport->connect_worker); |
a246b010 | 806 | |
9903cd1c | 807 | xs_close(xprt); |
edb267a6 | 808 | xs_free_peer_addresses(xprt); |
a246b010 | 809 | kfree(xprt->slot); |
c8541ecd | 810 | kfree(xprt); |
bc25571e | 811 | module_put(THIS_MODULE); |
a246b010 CL |
812 | } |
813 | ||
9903cd1c CL |
814 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
815 | { | |
816 | return (struct rpc_xprt *) sk->sk_user_data; | |
817 | } | |
818 | ||
819 | /** | |
820 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
821 | * @sk: socket with data to read | |
822 | * @len: how much data to read | |
823 | * | |
a246b010 | 824 | */ |
9903cd1c | 825 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 826 | { |
9903cd1c CL |
827 | struct rpc_task *task; |
828 | struct rpc_xprt *xprt; | |
a246b010 | 829 | struct rpc_rqst *rovr; |
9903cd1c | 830 | struct sk_buff *skb; |
a246b010 | 831 | int err, repsize, copied; |
d8ed029d AD |
832 | u32 _xid; |
833 | __be32 *xp; | |
a246b010 CL |
834 | |
835 | read_lock(&sk->sk_callback_lock); | |
46121cf7 | 836 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 837 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 838 | goto out; |
a246b010 CL |
839 | |
840 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
841 | goto out; | |
842 | ||
843 | if (xprt->shutdown) | |
844 | goto dropit; | |
845 | ||
846 | repsize = skb->len - sizeof(struct udphdr); | |
847 | if (repsize < 4) { | |
46121cf7 | 848 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
849 | goto dropit; |
850 | } | |
851 | ||
852 | /* Copy the XID from the skb... */ | |
853 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
854 | sizeof(_xid), &_xid); | |
855 | if (xp == NULL) | |
856 | goto dropit; | |
857 | ||
858 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 859 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
860 | rovr = xprt_lookup_rqst(xprt, *xp); |
861 | if (!rovr) | |
862 | goto out_unlock; | |
863 | task = rovr->rq_task; | |
864 | ||
a246b010 CL |
865 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
866 | copied = repsize; | |
867 | ||
868 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
869 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
870 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 871 | goto out_unlock; |
1781f7f5 HX |
872 | } |
873 | ||
874 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 CL |
875 | |
876 | /* Something worked... */ | |
adf30907 | 877 | dst_confirm(skb_dst(skb)); |
a246b010 | 878 | |
1570c1e4 CL |
879 | xprt_adjust_cwnd(task, copied); |
880 | xprt_update_rtt(task); | |
881 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
882 | |
883 | out_unlock: | |
4a0f8c04 | 884 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
885 | dropit: |
886 | skb_free_datagram(sk, skb); | |
887 | out: | |
888 | read_unlock(&sk->sk_callback_lock); | |
889 | } | |
890 | ||
dd456471 | 891 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 892 | { |
51971139 | 893 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
894 | size_t len, used; |
895 | char *p; | |
896 | ||
51971139 CL |
897 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
898 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 899 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 900 | transport->tcp_offset += used; |
a246b010 CL |
901 | if (used != len) |
902 | return; | |
808012fb | 903 | |
51971139 CL |
904 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
905 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 906 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 907 | else |
e136d092 | 908 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 909 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 910 | |
e136d092 | 911 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 912 | transport->tcp_offset = 0; |
808012fb | 913 | |
a246b010 | 914 | /* Sanity check of the record length */ |
18dca02a | 915 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 916 | dprintk("RPC: invalid TCP record fragment length\n"); |
3ebb067d | 917 | xprt_force_disconnect(xprt); |
9903cd1c | 918 | return; |
a246b010 | 919 | } |
46121cf7 | 920 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 921 | transport->tcp_reclen); |
a246b010 CL |
922 | } |
923 | ||
51971139 | 924 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 925 | { |
51971139 | 926 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 927 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 928 | transport->tcp_offset = 0; |
e136d092 CL |
929 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
930 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
931 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 932 | transport->tcp_copied = 0; |
a246b010 CL |
933 | } |
934 | } | |
935 | } | |
936 | ||
dd456471 | 937 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
938 | { |
939 | size_t len, used; | |
940 | char *p; | |
941 | ||
51971139 | 942 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 943 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 944 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 945 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 946 | transport->tcp_offset += used; |
a246b010 CL |
947 | if (used != len) |
948 | return; | |
e136d092 | 949 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 950 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 951 | transport->tcp_copied = 4; |
18dca02a RL |
952 | dprintk("RPC: reading %s XID %08x\n", |
953 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
954 | : "request with", | |
51971139 CL |
955 | ntohl(transport->tcp_xid)); |
956 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
957 | } |
958 | ||
18dca02a RL |
959 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
960 | struct xdr_skb_reader *desc) | |
a246b010 | 961 | { |
18dca02a RL |
962 | size_t len, used; |
963 | u32 offset; | |
964 | __be32 calldir; | |
965 | ||
966 | /* | |
967 | * We want transport->tcp_offset to be 8 at the end of this routine | |
968 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
969 | * When this function is called for the first time, | |
970 | * transport->tcp_offset is 4 (after having already read the xid). | |
971 | */ | |
972 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
973 | len = sizeof(calldir) - offset; | |
974 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); | |
975 | used = xdr_skb_read_bits(desc, &calldir, len); | |
976 | transport->tcp_offset += used; | |
977 | if (used != len) | |
978 | return; | |
f4a2e418 RL |
979 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
980 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
18dca02a | 981 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
f4a2e418 RL |
982 | /* |
983 | * We don't yet have the XDR buffer, so we will write the calldir | |
984 | * out after we get the buffer from the 'struct rpc_rqst' | |
985 | */ | |
18dca02a RL |
986 | if (ntohl(calldir) == RPC_REPLY) |
987 | transport->tcp_flags |= TCP_RPC_REPLY; | |
988 | else | |
989 | transport->tcp_flags &= ~TCP_RPC_REPLY; | |
990 | dprintk("RPC: reading %s CALL/REPLY flag %08x\n", | |
991 | (transport->tcp_flags & TCP_RPC_REPLY) ? | |
992 | "reply for" : "request with", calldir); | |
993 | xs_tcp_check_fraghdr(transport); | |
994 | } | |
995 | ||
44b98efd RL |
996 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
997 | struct xdr_skb_reader *desc, | |
998 | struct rpc_rqst *req) | |
a246b010 | 999 | { |
44b98efd RL |
1000 | struct sock_xprt *transport = |
1001 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1002 | struct xdr_buf *rcvbuf; |
1003 | size_t len; | |
1004 | ssize_t r; | |
1005 | ||
a246b010 | 1006 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1007 | |
1008 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1009 | /* | |
1010 | * Save the RPC direction in the XDR buffer | |
1011 | */ | |
1012 | __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? | |
1013 | htonl(RPC_REPLY) : 0; | |
1014 | ||
1015 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, | |
1016 | &calldir, sizeof(calldir)); | |
1017 | transport->tcp_copied += sizeof(calldir); | |
1018 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; | |
a246b010 CL |
1019 | } |
1020 | ||
a246b010 | 1021 | len = desc->count; |
51971139 | 1022 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1023 | struct xdr_skb_reader my_desc; |
a246b010 | 1024 | |
51971139 | 1025 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1026 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1027 | my_desc.count = len; | |
51971139 | 1028 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1029 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1030 | desc->count -= r; |
1031 | desc->offset += r; | |
1032 | } else | |
51971139 | 1033 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1034 | desc, xdr_skb_read_bits); |
a246b010 CL |
1035 | |
1036 | if (r > 0) { | |
51971139 CL |
1037 | transport->tcp_copied += r; |
1038 | transport->tcp_offset += r; | |
a246b010 CL |
1039 | } |
1040 | if (r != len) { | |
1041 | /* Error when copying to the receive buffer, | |
1042 | * usually because we weren't able to allocate | |
1043 | * additional buffer pages. All we can do now | |
e136d092 | 1044 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1045 | * will not receive any additional updates, |
1046 | * and time out. | |
1047 | * Any remaining data from this record will | |
1048 | * be discarded. | |
1049 | */ | |
e136d092 | 1050 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1051 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1052 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1053 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1054 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1055 | xprt, transport->tcp_copied, | |
1056 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1057 | return; |
a246b010 CL |
1058 | } |
1059 | ||
46121cf7 | 1060 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1061 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1062 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1063 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1064 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1065 | |
1066 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1067 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1068 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1069 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1070 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 CL |
1071 | } |
1072 | ||
44b98efd RL |
1073 | return; |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * Finds the request corresponding to the RPC xid and invokes the common | |
1078 | * tcp read code to read the data. | |
1079 | */ | |
1080 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1081 | struct xdr_skb_reader *desc) | |
1082 | { | |
1083 | struct sock_xprt *transport = | |
1084 | container_of(xprt, struct sock_xprt, xprt); | |
1085 | struct rpc_rqst *req; | |
1086 | ||
1087 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1088 | ||
1089 | /* Find and lock the request corresponding to this xid */ | |
1090 | spin_lock(&xprt->transport_lock); | |
1091 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1092 | if (!req) { | |
1093 | dprintk("RPC: XID %08x request not found!\n", | |
1094 | ntohl(transport->tcp_xid)); | |
1095 | spin_unlock(&xprt->transport_lock); | |
1096 | return -1; | |
1097 | } | |
1098 | ||
1099 | xs_tcp_read_common(xprt, desc, req); | |
1100 | ||
e136d092 | 1101 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1102 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1103 | |
4a0f8c04 | 1104 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1105 | return 0; |
1106 | } | |
1107 | ||
1108 | #if defined(CONFIG_NFS_V4_1) | |
1109 | /* | |
1110 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1111 | * tcp read code to read the data. The result is placed in the callback | |
1112 | * queue. | |
1113 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1114 | * connection and return -1. | |
1115 | */ | |
1116 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1117 | struct xdr_skb_reader *desc) | |
1118 | { | |
1119 | struct sock_xprt *transport = | |
1120 | container_of(xprt, struct sock_xprt, xprt); | |
1121 | struct rpc_rqst *req; | |
1122 | ||
1123 | req = xprt_alloc_bc_request(xprt); | |
1124 | if (req == NULL) { | |
1125 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1126 | xprt_force_disconnect(xprt); | |
1127 | return -1; | |
1128 | } | |
1129 | ||
1130 | req->rq_xid = transport->tcp_xid; | |
1131 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1132 | xs_tcp_read_common(xprt, desc, req); | |
1133 | ||
1134 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1135 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1136 | ||
1137 | /* | |
1138 | * Add callback request to callback list. The callback | |
1139 | * service sleeps on the sv_cb_waitq waiting for new | |
1140 | * requests. Wake it up after adding enqueing the | |
1141 | * request. | |
1142 | */ | |
1143 | dprintk("RPC: add callback request to list\n"); | |
1144 | spin_lock(&bc_serv->sv_cb_lock); | |
1145 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1146 | spin_unlock(&bc_serv->sv_cb_lock); | |
1147 | wake_up(&bc_serv->sv_cb_waitq); | |
1148 | } | |
1149 | ||
1150 | req->rq_private_buf.len = transport->tcp_copied; | |
1151 | ||
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1156 | struct xdr_skb_reader *desc) | |
1157 | { | |
1158 | struct sock_xprt *transport = | |
1159 | container_of(xprt, struct sock_xprt, xprt); | |
1160 | ||
1161 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1162 | xs_tcp_read_reply(xprt, desc) : | |
1163 | xs_tcp_read_callback(xprt, desc); | |
1164 | } | |
1165 | #else | |
1166 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1167 | struct xdr_skb_reader *desc) | |
1168 | { | |
1169 | return xs_tcp_read_reply(xprt, desc); | |
1170 | } | |
1171 | #endif /* CONFIG_NFS_V4_1 */ | |
1172 | ||
1173 | /* | |
1174 | * Read data off the transport. This can be either an RPC_CALL or an | |
1175 | * RPC_REPLY. Relay the processing to helper functions. | |
1176 | */ | |
1177 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1178 | struct xdr_skb_reader *desc) | |
1179 | { | |
1180 | struct sock_xprt *transport = | |
1181 | container_of(xprt, struct sock_xprt, xprt); | |
1182 | ||
1183 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1184 | xs_tcp_check_fraghdr(transport); | |
1185 | else { | |
1186 | /* | |
1187 | * The transport_lock protects the request handling. | |
1188 | * There's no need to hold it to update the tcp_flags. | |
1189 | */ | |
1190 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1191 | } | |
a246b010 CL |
1192 | } |
1193 | ||
dd456471 | 1194 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1195 | { |
1196 | size_t len; | |
1197 | ||
51971139 | 1198 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1199 | if (len > desc->count) |
1200 | len = desc->count; | |
1201 | desc->count -= len; | |
1202 | desc->offset += len; | |
51971139 | 1203 | transport->tcp_offset += len; |
46121cf7 | 1204 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1205 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1206 | } |
1207 | ||
9903cd1c | 1208 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1209 | { |
1210 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1211 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1212 | struct xdr_skb_reader desc = { |
a246b010 CL |
1213 | .skb = skb, |
1214 | .offset = offset, | |
1215 | .count = len, | |
9903cd1c | 1216 | }; |
a246b010 | 1217 | |
46121cf7 | 1218 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1219 | do { |
1220 | /* Read in a new fragment marker if necessary */ | |
1221 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1222 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1223 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1224 | continue; |
1225 | } | |
1226 | /* Read in the xid if necessary */ | |
e136d092 | 1227 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1228 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1229 | continue; |
1230 | } | |
18dca02a | 1231 | /* Read in the call/reply flag */ |
f4a2e418 | 1232 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1233 | xs_tcp_read_calldir(transport, &desc); |
1234 | continue; | |
1235 | } | |
a246b010 | 1236 | /* Read in the request data */ |
e136d092 | 1237 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1238 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1239 | continue; |
1240 | } | |
1241 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1242 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1243 | } while (desc.count); |
46121cf7 | 1244 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1245 | return len - desc.count; |
1246 | } | |
1247 | ||
9903cd1c CL |
1248 | /** |
1249 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1250 | * @sk: socket with data to read | |
1251 | * @bytes: how much data to read | |
1252 | * | |
1253 | */ | |
1254 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1255 | { |
1256 | struct rpc_xprt *xprt; | |
1257 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1258 | int read; |
a246b010 | 1259 | |
46121cf7 CL |
1260 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1261 | ||
a246b010 | 1262 | read_lock(&sk->sk_callback_lock); |
9903cd1c | 1263 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1264 | goto out; |
a246b010 CL |
1265 | if (xprt->shutdown) |
1266 | goto out; | |
1267 | ||
61d0a8e6 NB |
1268 | /* Any data means we had a useful conversation, so |
1269 | * the we don't need to delay the next reconnect | |
1270 | */ | |
1271 | if (xprt->reestablish_timeout) | |
1272 | xprt->reestablish_timeout = 0; | |
1273 | ||
9903cd1c | 1274 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1275 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1276 | do { |
1277 | rd_desc.count = 65536; | |
1278 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1279 | } while (read > 0); | |
a246b010 CL |
1280 | out: |
1281 | read_unlock(&sk->sk_callback_lock); | |
1282 | } | |
1283 | ||
7d1e8255 TM |
1284 | /* |
1285 | * Do the equivalent of linger/linger2 handling for dealing with | |
1286 | * broken servers that don't close the socket in a timely | |
1287 | * fashion | |
1288 | */ | |
1289 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1290 | unsigned long timeout) | |
1291 | { | |
1292 | struct sock_xprt *transport; | |
1293 | ||
1294 | if (xprt_test_and_set_connecting(xprt)) | |
1295 | return; | |
1296 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1297 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1298 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1299 | timeout); | |
1300 | } | |
1301 | ||
1302 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1303 | { | |
1304 | struct sock_xprt *transport; | |
1305 | ||
1306 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1307 | ||
1308 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1309 | !cancel_delayed_work(&transport->connect_worker)) | |
1310 | return; | |
1311 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1312 | xprt_clear_connecting(xprt); | |
1313 | } | |
1314 | ||
1315 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1316 | { | |
1317 | smp_mb__before_clear_bit(); | |
1318 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1319 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1320 | smp_mb__after_clear_bit(); | |
1321 | /* Mark transport as closed and wake up all pending tasks */ | |
1322 | xprt_disconnect_done(xprt); | |
1323 | } | |
1324 | ||
9903cd1c CL |
1325 | /** |
1326 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1327 | * @sk: socket whose state has changed | |
1328 | * | |
1329 | */ | |
1330 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1331 | { |
9903cd1c | 1332 | struct rpc_xprt *xprt; |
a246b010 CL |
1333 | |
1334 | read_lock(&sk->sk_callback_lock); | |
1335 | if (!(xprt = xprt_from_sock(sk))) | |
1336 | goto out; | |
46121cf7 CL |
1337 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1338 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", | |
1339 | sk->sk_state, xprt_connected(xprt), | |
1340 | sock_flag(sk, SOCK_DEAD), | |
1341 | sock_flag(sk, SOCK_ZAPPED)); | |
a246b010 CL |
1342 | |
1343 | switch (sk->sk_state) { | |
1344 | case TCP_ESTABLISHED: | |
4a0f8c04 | 1345 | spin_lock_bh(&xprt->transport_lock); |
a246b010 | 1346 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1347 | struct sock_xprt *transport = container_of(xprt, |
1348 | struct sock_xprt, xprt); | |
1349 | ||
a246b010 | 1350 | /* Reset TCP record info */ |
51971139 CL |
1351 | transport->tcp_offset = 0; |
1352 | transport->tcp_reclen = 0; | |
1353 | transport->tcp_copied = 0; | |
e136d092 CL |
1354 | transport->tcp_flags = |
1355 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1356 | |
2a491991 | 1357 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1358 | } |
4a0f8c04 | 1359 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 | 1360 | break; |
3b948ae5 TM |
1361 | case TCP_FIN_WAIT1: |
1362 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1363 | xprt->connect_cookie++; |
663b8858 | 1364 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1365 | set_bit(XPRT_CLOSING, &xprt->state); |
1366 | smp_mb__before_clear_bit(); | |
1367 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1368 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1369 | smp_mb__after_clear_bit(); |
25fe6142 | 1370 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1371 | break; |
632e3bdc | 1372 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1373 | /* The server initiated a shutdown of the socket */ |
66af1e55 | 1374 | xprt_force_disconnect(xprt); |
663b8858 | 1375 | case TCP_SYN_SENT: |
7c1d71cf | 1376 | xprt->connect_cookie++; |
663b8858 TM |
1377 | case TCP_CLOSING: |
1378 | /* | |
1379 | * If the server closed down the connection, make sure that | |
1380 | * we back off before reconnecting | |
1381 | */ | |
1382 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1383 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1384 | break; |
1385 | case TCP_LAST_ACK: | |
670f9457 | 1386 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1387 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1388 | smp_mb__before_clear_bit(); |
1389 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1390 | smp_mb__after_clear_bit(); | |
1391 | break; | |
1392 | case TCP_CLOSE: | |
7d1e8255 TM |
1393 | xs_tcp_cancel_linger_timeout(xprt); |
1394 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1395 | } |
1396 | out: | |
1397 | read_unlock(&sk->sk_callback_lock); | |
1398 | } | |
1399 | ||
2a9e1cfa | 1400 | /** |
482f32e6 | 1401 | * xs_error_report - callback mainly for catching socket errors |
2a9e1cfa TM |
1402 | * @sk: socket |
1403 | */ | |
482f32e6 | 1404 | static void xs_error_report(struct sock *sk) |
2a9e1cfa TM |
1405 | { |
1406 | struct rpc_xprt *xprt; | |
1407 | ||
1408 | read_lock(&sk->sk_callback_lock); | |
2a9e1cfa TM |
1409 | if (!(xprt = xprt_from_sock(sk))) |
1410 | goto out; | |
1411 | dprintk("RPC: %s client %p...\n" | |
1412 | "RPC: error %d\n", | |
1413 | __func__, xprt, sk->sk_err); | |
482f32e6 | 1414 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
2a9e1cfa TM |
1415 | out: |
1416 | read_unlock(&sk->sk_callback_lock); | |
1417 | } | |
1418 | ||
1f0fa154 IJ |
1419 | static void xs_write_space(struct sock *sk) |
1420 | { | |
1421 | struct socket *sock; | |
1422 | struct rpc_xprt *xprt; | |
1423 | ||
1424 | if (unlikely(!(sock = sk->sk_socket))) | |
1425 | return; | |
1426 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1427 | ||
1428 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1429 | return; | |
1430 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1431 | return; | |
1432 | ||
1433 | xprt_write_space(xprt); | |
1434 | } | |
1435 | ||
9903cd1c | 1436 | /** |
c7b2cae8 CL |
1437 | * xs_udp_write_space - callback invoked when socket buffer space |
1438 | * becomes available | |
9903cd1c CL |
1439 | * @sk: socket whose state has changed |
1440 | * | |
a246b010 CL |
1441 | * Called when more output buffer space is available for this socket. |
1442 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1443 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1444 | * with a bunch of small requests. |
1445 | */ | |
c7b2cae8 | 1446 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1447 | { |
a246b010 | 1448 | read_lock(&sk->sk_callback_lock); |
a246b010 | 1449 | |
c7b2cae8 | 1450 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1451 | if (sock_writeable(sk)) |
1452 | xs_write_space(sk); | |
a246b010 | 1453 | |
c7b2cae8 CL |
1454 | read_unlock(&sk->sk_callback_lock); |
1455 | } | |
a246b010 | 1456 | |
c7b2cae8 CL |
1457 | /** |
1458 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1459 | * becomes available | |
1460 | * @sk: socket whose state has changed | |
1461 | * | |
1462 | * Called when more output buffer space is available for this socket. | |
1463 | * We try not to wake our writers until they can make "significant" | |
1464 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1465 | * with a bunch of small requests. | |
1466 | */ | |
1467 | static void xs_tcp_write_space(struct sock *sk) | |
1468 | { | |
1469 | read_lock(&sk->sk_callback_lock); | |
1470 | ||
1471 | /* from net/core/stream.c:sk_stream_write_space */ | |
1f0fa154 IJ |
1472 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1473 | xs_write_space(sk); | |
b6ddf64f | 1474 | |
a246b010 CL |
1475 | read_unlock(&sk->sk_callback_lock); |
1476 | } | |
1477 | ||
470056c2 | 1478 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1479 | { |
ee0ac0c2 CL |
1480 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1481 | struct sock *sk = transport->inet; | |
a246b010 | 1482 | |
7c6e066e | 1483 | if (transport->rcvsize) { |
a246b010 | 1484 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1485 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1486 | } |
7c6e066e | 1487 | if (transport->sndsize) { |
a246b010 | 1488 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1489 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1490 | sk->sk_write_space(sk); |
1491 | } | |
1492 | } | |
1493 | ||
43118c29 | 1494 | /** |
470056c2 | 1495 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1496 | * @xprt: generic transport |
470056c2 CL |
1497 | * @sndsize: requested size of send buffer, in bytes |
1498 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1499 | * |
470056c2 | 1500 | * Set socket send and receive buffer size limits. |
43118c29 | 1501 | */ |
470056c2 | 1502 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1503 | { |
7c6e066e CL |
1504 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1505 | ||
1506 | transport->sndsize = 0; | |
470056c2 | 1507 | if (sndsize) |
7c6e066e CL |
1508 | transport->sndsize = sndsize + 1024; |
1509 | transport->rcvsize = 0; | |
470056c2 | 1510 | if (rcvsize) |
7c6e066e | 1511 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1512 | |
1513 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1514 | } |
1515 | ||
46c0ee8b CL |
1516 | /** |
1517 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1518 | * @task: task that timed out | |
1519 | * | |
1520 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1521 | */ | |
1522 | static void xs_udp_timer(struct rpc_task *task) | |
1523 | { | |
1524 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1525 | } | |
1526 | ||
b85d8806 CL |
1527 | static unsigned short xs_get_random_port(void) |
1528 | { | |
1529 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1530 | unsigned short rand = (unsigned short) net_random() % range; | |
1531 | return rand + xprt_min_resvport; | |
1532 | } | |
1533 | ||
92200412 CL |
1534 | /** |
1535 | * xs_set_port - reset the port number in the remote endpoint address | |
1536 | * @xprt: generic transport | |
1537 | * @port: new port number | |
1538 | * | |
1539 | */ | |
1540 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1541 | { | |
46121cf7 | 1542 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1543 | |
9dc3b095 CL |
1544 | rpc_set_port(xs_addr(xprt), port); |
1545 | xs_update_peer_port(xprt); | |
92200412 CL |
1546 | } |
1547 | ||
67a391d7 TM |
1548 | static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) |
1549 | { | |
fbfffbd5 | 1550 | unsigned short port = transport->srcport; |
67a391d7 TM |
1551 | |
1552 | if (port == 0 && transport->xprt.resvport) | |
1553 | port = xs_get_random_port(); | |
1554 | return port; | |
1555 | } | |
1556 | ||
1557 | static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) | |
1558 | { | |
fbfffbd5 CL |
1559 | if (transport->srcport != 0) |
1560 | transport->srcport = 0; | |
67a391d7 TM |
1561 | if (!transport->xprt.resvport) |
1562 | return 0; | |
1563 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1564 | return xprt_max_resvport; | |
1565 | return --port; | |
1566 | } | |
1567 | ||
7dc753f0 | 1568 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
a246b010 CL |
1569 | { |
1570 | struct sockaddr_in myaddr = { | |
1571 | .sin_family = AF_INET, | |
1572 | }; | |
d3bc9a1d | 1573 | struct sockaddr_in *sa; |
67a391d7 TM |
1574 | int err, nloop = 0; |
1575 | unsigned short port = xs_get_srcport(transport, sock); | |
1576 | unsigned short last; | |
a246b010 | 1577 | |
fbfffbd5 | 1578 | sa = (struct sockaddr_in *)&transport->srcaddr; |
d3bc9a1d | 1579 | myaddr.sin_addr = sa->sin_addr; |
a246b010 CL |
1580 | do { |
1581 | myaddr.sin_port = htons(port); | |
e6242e92 | 1582 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 | 1583 | sizeof(myaddr)); |
67a391d7 | 1584 | if (port == 0) |
d3bc9a1d | 1585 | break; |
a246b010 | 1586 | if (err == 0) { |
fbfffbd5 | 1587 | transport->srcport = port; |
d3bc9a1d | 1588 | break; |
a246b010 | 1589 | } |
67a391d7 TM |
1590 | last = port; |
1591 | port = xs_next_srcport(transport, sock, port); | |
1592 | if (port > last) | |
1593 | nloop++; | |
1594 | } while (err == -EADDRINUSE && nloop != 2); | |
21454aaa HH |
1595 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", |
1596 | __func__, &myaddr.sin_addr, | |
7dc753f0 | 1597 | port, err ? "failed" : "ok", err); |
a246b010 CL |
1598 | return err; |
1599 | } | |
1600 | ||
90058d37 CL |
1601 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1602 | { | |
1603 | struct sockaddr_in6 myaddr = { | |
1604 | .sin6_family = AF_INET6, | |
1605 | }; | |
1606 | struct sockaddr_in6 *sa; | |
67a391d7 TM |
1607 | int err, nloop = 0; |
1608 | unsigned short port = xs_get_srcport(transport, sock); | |
1609 | unsigned short last; | |
90058d37 | 1610 | |
fbfffbd5 | 1611 | sa = (struct sockaddr_in6 *)&transport->srcaddr; |
90058d37 CL |
1612 | myaddr.sin6_addr = sa->sin6_addr; |
1613 | do { | |
1614 | myaddr.sin6_port = htons(port); | |
1615 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, | |
1616 | sizeof(myaddr)); | |
67a391d7 | 1617 | if (port == 0) |
90058d37 CL |
1618 | break; |
1619 | if (err == 0) { | |
fbfffbd5 | 1620 | transport->srcport = port; |
90058d37 CL |
1621 | break; |
1622 | } | |
67a391d7 TM |
1623 | last = port; |
1624 | port = xs_next_srcport(transport, sock, port); | |
1625 | if (port > last) | |
1626 | nloop++; | |
1627 | } while (err == -EADDRINUSE && nloop != 2); | |
5b095d98 | 1628 | dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", |
fdb46ee7 | 1629 | &myaddr.sin6_addr, port, err ? "failed" : "ok", err); |
a246b010 CL |
1630 | return err; |
1631 | } | |
1632 | ||
ed07536e PZ |
1633 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1634 | static struct lock_class_key xs_key[2]; | |
1635 | static struct lock_class_key xs_slock_key[2]; | |
1636 | ||
8945ee5e | 1637 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1638 | { |
1639 | struct sock *sk = sock->sk; | |
8945ee5e | 1640 | |
02b3d346 | 1641 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1642 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1643 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1644 | } | |
ed07536e | 1645 | |
8945ee5e CL |
1646 | static inline void xs_reclassify_socket6(struct socket *sock) |
1647 | { | |
1648 | struct sock *sk = sock->sk; | |
ed07536e | 1649 | |
f4921aff | 1650 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1651 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1652 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e PZ |
1653 | } |
1654 | #else | |
8945ee5e CL |
1655 | static inline void xs_reclassify_socket4(struct socket *sock) |
1656 | { | |
1657 | } | |
1658 | ||
1659 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1660 | { |
1661 | } | |
1662 | #endif | |
1663 | ||
16be2d20 CL |
1664 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1665 | { | |
1666 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1667 | ||
1668 | if (!transport->inet) { | |
1669 | struct sock *sk = sock->sk; | |
1670 | ||
1671 | write_lock_bh(&sk->sk_callback_lock); | |
1672 | ||
2a9e1cfa TM |
1673 | xs_save_old_callbacks(transport, sk); |
1674 | ||
16be2d20 | 1675 | sk->sk_user_data = xprt; |
16be2d20 CL |
1676 | sk->sk_data_ready = xs_udp_data_ready; |
1677 | sk->sk_write_space = xs_udp_write_space; | |
482f32e6 | 1678 | sk->sk_error_report = xs_error_report; |
16be2d20 CL |
1679 | sk->sk_no_check = UDP_CSUM_NORCV; |
1680 | sk->sk_allocation = GFP_ATOMIC; | |
1681 | ||
1682 | xprt_set_connected(xprt); | |
1683 | ||
1684 | /* Reset to new socket */ | |
1685 | transport->sock = sock; | |
1686 | transport->inet = sk; | |
1687 | ||
1688 | write_unlock_bh(&sk->sk_callback_lock); | |
1689 | } | |
1690 | xs_udp_do_set_buffer_size(xprt); | |
1691 | } | |
1692 | ||
b0d93ad5 | 1693 | /** |
9c3d72de | 1694 | * xs_udp_connect_worker4 - set up a UDP socket |
65f27f38 | 1695 | * @work: RPC transport to connect |
b0d93ad5 CL |
1696 | * |
1697 | * Invoked by a work queue tasklet. | |
1698 | */ | |
9c3d72de | 1699 | static void xs_udp_connect_worker4(struct work_struct *work) |
a246b010 | 1700 | { |
34161db6 TM |
1701 | struct sock_xprt *transport = |
1702 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1703 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1704 | struct socket *sock = transport->sock; |
b0d93ad5 | 1705 | int err, status = -EIO; |
9903cd1c | 1706 | |
01d37c42 | 1707 | if (xprt->shutdown) |
b0d93ad5 | 1708 | goto out; |
9903cd1c | 1709 | |
b0d93ad5 | 1710 | /* Start by resetting any existing state */ |
fe315e76 | 1711 | xs_reset_transport(transport); |
9903cd1c | 1712 | |
fe315e76 CL |
1713 | err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1714 | if (err < 0) { | |
46121cf7 | 1715 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
b0d93ad5 CL |
1716 | goto out; |
1717 | } | |
8945ee5e | 1718 | xs_reclassify_socket4(sock); |
9903cd1c | 1719 | |
7dc753f0 | 1720 | if (xs_bind4(transport, sock)) { |
b0d93ad5 CL |
1721 | sock_release(sock); |
1722 | goto out; | |
1723 | } | |
9903cd1c | 1724 | |
c740eff8 CL |
1725 | dprintk("RPC: worker connecting xprt %p via %s to " |
1726 | "%s (port %s)\n", xprt, | |
1727 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1728 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1729 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 1730 | |
16be2d20 | 1731 | xs_udp_finish_connecting(xprt, sock); |
b0d93ad5 CL |
1732 | status = 0; |
1733 | out: | |
b0d93ad5 | 1734 | xprt_clear_connecting(xprt); |
7d1e8255 | 1735 | xprt_wake_pending_tasks(xprt, status); |
a246b010 | 1736 | } |
a246b010 | 1737 | |
68e220bd CL |
1738 | /** |
1739 | * xs_udp_connect_worker6 - set up a UDP socket | |
1740 | * @work: RPC transport to connect | |
1741 | * | |
1742 | * Invoked by a work queue tasklet. | |
1743 | */ | |
1744 | static void xs_udp_connect_worker6(struct work_struct *work) | |
1745 | { | |
1746 | struct sock_xprt *transport = | |
1747 | container_of(work, struct sock_xprt, connect_worker.work); | |
1748 | struct rpc_xprt *xprt = &transport->xprt; | |
1749 | struct socket *sock = transport->sock; | |
1750 | int err, status = -EIO; | |
a246b010 | 1751 | |
01d37c42 | 1752 | if (xprt->shutdown) |
68e220bd | 1753 | goto out; |
b0d93ad5 | 1754 | |
68e220bd | 1755 | /* Start by resetting any existing state */ |
fe315e76 | 1756 | xs_reset_transport(transport); |
a246b010 | 1757 | |
fe315e76 CL |
1758 | err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1759 | if (err < 0) { | |
68e220bd CL |
1760 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1761 | goto out; | |
1762 | } | |
8945ee5e | 1763 | xs_reclassify_socket6(sock); |
a246b010 | 1764 | |
68e220bd CL |
1765 | if (xs_bind6(transport, sock) < 0) { |
1766 | sock_release(sock); | |
1767 | goto out; | |
b0d93ad5 | 1768 | } |
68e220bd | 1769 | |
c740eff8 CL |
1770 | dprintk("RPC: worker connecting xprt %p via %s to " |
1771 | "%s (port %s)\n", xprt, | |
1772 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1773 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1774 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
1775 | |
1776 | xs_udp_finish_connecting(xprt, sock); | |
b0d93ad5 CL |
1777 | status = 0; |
1778 | out: | |
b0d93ad5 | 1779 | xprt_clear_connecting(xprt); |
7d1e8255 | 1780 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
1781 | } |
1782 | ||
3167e12c CL |
1783 | /* |
1784 | * We need to preserve the port number so the reply cache on the server can | |
1785 | * find our cached RPC replies when we get around to reconnecting. | |
1786 | */ | |
40d2549d | 1787 | static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
3167e12c CL |
1788 | { |
1789 | int result; | |
3167e12c CL |
1790 | struct sockaddr any; |
1791 | ||
46121cf7 | 1792 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
3167e12c CL |
1793 | |
1794 | /* | |
1795 | * Disconnect the transport socket by doing a connect operation | |
1796 | * with AF_UNSPEC. This should return immediately... | |
1797 | */ | |
1798 | memset(&any, 0, sizeof(any)); | |
1799 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1800 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
7d1e8255 TM |
1801 | if (!result) |
1802 | xs_sock_mark_closed(xprt); | |
1803 | else | |
46121cf7 | 1804 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
1805 | result); |
1806 | } | |
1807 | ||
40d2549d TM |
1808 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1809 | { | |
1810 | unsigned int state = transport->inet->sk_state; | |
1811 | ||
1812 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) | |
1813 | return; | |
1814 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) | |
1815 | return; | |
1816 | xs_abort_connection(xprt, transport); | |
1817 | } | |
1818 | ||
16be2d20 | 1819 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 1820 | { |
16be2d20 | 1821 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
edb267a6 | 1822 | |
ee0ac0c2 | 1823 | if (!transport->inet) { |
b0d93ad5 CL |
1824 | struct sock *sk = sock->sk; |
1825 | ||
1826 | write_lock_bh(&sk->sk_callback_lock); | |
1827 | ||
2a9e1cfa TM |
1828 | xs_save_old_callbacks(transport, sk); |
1829 | ||
b0d93ad5 | 1830 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
1831 | sk->sk_data_ready = xs_tcp_data_ready; |
1832 | sk->sk_state_change = xs_tcp_state_change; | |
1833 | sk->sk_write_space = xs_tcp_write_space; | |
482f32e6 | 1834 | sk->sk_error_report = xs_error_report; |
b079fa7b | 1835 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1836 | |
1837 | /* socket options */ | |
1838 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1839 | sock_reset_flag(sk, SOCK_LINGER); | |
1840 | tcp_sk(sk)->linger2 = 0; | |
1841 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1842 | |
1843 | xprt_clear_connected(xprt); | |
1844 | ||
1845 | /* Reset to new socket */ | |
ee0ac0c2 CL |
1846 | transport->sock = sock; |
1847 | transport->inet = sk; | |
b0d93ad5 CL |
1848 | |
1849 | write_unlock_bh(&sk->sk_callback_lock); | |
1850 | } | |
1851 | ||
01d37c42 TM |
1852 | if (!xprt_bound(xprt)) |
1853 | return -ENOTCONN; | |
1854 | ||
b0d93ad5 | 1855 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
1856 | xprt->stat.connect_count++; |
1857 | xprt->stat.connect_start = jiffies; | |
95392c59 | 1858 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
16be2d20 CL |
1859 | } |
1860 | ||
9903cd1c | 1861 | /** |
b61d59ff TM |
1862 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
1863 | * @xprt: RPC transport to connect | |
1864 | * @transport: socket transport to connect | |
1865 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
1866 | * |
1867 | * Invoked by a work queue tasklet. | |
a246b010 | 1868 | */ |
b61d59ff TM |
1869 | static void xs_tcp_setup_socket(struct rpc_xprt *xprt, |
1870 | struct sock_xprt *transport, | |
1871 | struct socket *(*create_sock)(struct rpc_xprt *, | |
1872 | struct sock_xprt *)) | |
a246b010 | 1873 | { |
ee0ac0c2 | 1874 | struct socket *sock = transport->sock; |
b61d59ff | 1875 | int status = -EIO; |
a246b010 | 1876 | |
01d37c42 | 1877 | if (xprt->shutdown) |
a246b010 CL |
1878 | goto out; |
1879 | ||
ee0ac0c2 | 1880 | if (!sock) { |
7d1e8255 | 1881 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
b61d59ff TM |
1882 | sock = create_sock(xprt, transport); |
1883 | if (IS_ERR(sock)) { | |
1884 | status = PTR_ERR(sock); | |
3167e12c CL |
1885 | goto out; |
1886 | } | |
7d1e8255 TM |
1887 | } else { |
1888 | int abort_and_exit; | |
a246b010 | 1889 | |
7d1e8255 TM |
1890 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
1891 | &xprt->state); | |
3167e12c | 1892 | /* "close" the socket, preserving the local port */ |
40d2549d | 1893 | xs_tcp_reuse_connection(xprt, transport); |
a246b010 | 1894 | |
7d1e8255 TM |
1895 | if (abort_and_exit) |
1896 | goto out_eagain; | |
1897 | } | |
a246b010 | 1898 | |
c740eff8 CL |
1899 | dprintk("RPC: worker connecting xprt %p via %s to " |
1900 | "%s (port %s)\n", xprt, | |
1901 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1902 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1903 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 1904 | |
16be2d20 | 1905 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 CL |
1906 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1907 | xprt, -status, xprt_connected(xprt), | |
1908 | sock->sk->sk_state); | |
2a491991 | 1909 | switch (status) { |
f75e6745 TM |
1910 | default: |
1911 | printk("%s: connect returned unhandled error %d\n", | |
1912 | __func__, status); | |
1913 | case -EADDRNOTAVAIL: | |
1914 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
1915 | * and retry | |
1916 | */ | |
1917 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
1918 | xprt_force_disconnect(xprt); | |
88b5ed73 | 1919 | break; |
8a2cec29 TM |
1920 | case -ECONNREFUSED: |
1921 | case -ECONNRESET: | |
1922 | case -ENETUNREACH: | |
1923 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
1924 | case 0: |
1925 | case -EINPROGRESS: | |
1926 | case -EALREADY: | |
7d1e8255 TM |
1927 | xprt_clear_connecting(xprt); |
1928 | return; | |
a246b010 | 1929 | } |
7d1e8255 | 1930 | out_eagain: |
2a491991 | 1931 | status = -EAGAIN; |
a246b010 | 1932 | out: |
68e220bd | 1933 | xprt_clear_connecting(xprt); |
7d1e8255 | 1934 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 1935 | } |
b0d93ad5 | 1936 | |
b61d59ff TM |
1937 | static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, |
1938 | struct sock_xprt *transport) | |
1939 | { | |
1940 | struct socket *sock; | |
1941 | int err; | |
1942 | ||
1943 | /* start from scratch */ | |
1944 | err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1945 | if (err < 0) { | |
1946 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
1947 | -err); | |
1948 | goto out_err; | |
1949 | } | |
1950 | xs_reclassify_socket4(sock); | |
1951 | ||
1952 | if (xs_bind4(transport, sock) < 0) { | |
1953 | sock_release(sock); | |
1954 | goto out_err; | |
1955 | } | |
1956 | return sock; | |
1957 | out_err: | |
1958 | return ERR_PTR(-EIO); | |
68e220bd | 1959 | } |
b0d93ad5 | 1960 | |
68e220bd | 1961 | /** |
b61d59ff | 1962 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
68e220bd CL |
1963 | * @work: RPC transport to connect |
1964 | * | |
1965 | * Invoked by a work queue tasklet. | |
1966 | */ | |
b61d59ff | 1967 | static void xs_tcp_connect_worker4(struct work_struct *work) |
68e220bd CL |
1968 | { |
1969 | struct sock_xprt *transport = | |
1970 | container_of(work, struct sock_xprt, connect_worker.work); | |
1971 | struct rpc_xprt *xprt = &transport->xprt; | |
3167e12c | 1972 | |
b61d59ff TM |
1973 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); |
1974 | } | |
b0d93ad5 | 1975 | |
b61d59ff TM |
1976 | static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, |
1977 | struct sock_xprt *transport) | |
1978 | { | |
1979 | struct socket *sock; | |
1980 | int err; | |
7d1e8255 | 1981 | |
b61d59ff TM |
1982 | /* start from scratch */ |
1983 | err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1984 | if (err < 0) { | |
1985 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
1986 | -err); | |
1987 | goto out_err; | |
1988 | } | |
1989 | xs_reclassify_socket6(sock); | |
b0d93ad5 | 1990 | |
b61d59ff TM |
1991 | if (xs_bind6(transport, sock) < 0) { |
1992 | sock_release(sock); | |
1993 | goto out_err; | |
7d1e8255 | 1994 | } |
b61d59ff TM |
1995 | return sock; |
1996 | out_err: | |
1997 | return ERR_PTR(-EIO); | |
1998 | } | |
b0d93ad5 | 1999 | |
b61d59ff TM |
2000 | /** |
2001 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint | |
2002 | * @work: RPC transport to connect | |
2003 | * | |
2004 | * Invoked by a work queue tasklet. | |
2005 | */ | |
2006 | static void xs_tcp_connect_worker6(struct work_struct *work) | |
2007 | { | |
2008 | struct sock_xprt *transport = | |
2009 | container_of(work, struct sock_xprt, connect_worker.work); | |
2010 | struct rpc_xprt *xprt = &transport->xprt; | |
b0d93ad5 | 2011 | |
b61d59ff | 2012 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); |
a246b010 CL |
2013 | } |
2014 | ||
9903cd1c CL |
2015 | /** |
2016 | * xs_connect - connect a socket to a remote endpoint | |
2017 | * @task: address of RPC task that manages state of connect request | |
2018 | * | |
2019 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2020 | * |
2021 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2022 | * to guarantee that even unprivileged user processes can set up a | |
2023 | * socket on a privileged port. | |
2024 | * | |
2025 | * If a UDP socket connect fails, the delay behavior here prevents | |
2026 | * retry floods (hard mounts). | |
9903cd1c CL |
2027 | */ |
2028 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
2029 | { |
2030 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 2031 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2032 | |
b0d93ad5 CL |
2033 | if (xprt_test_and_set_connecting(xprt)) |
2034 | return; | |
2035 | ||
ee0ac0c2 | 2036 | if (transport->sock != NULL) { |
46121cf7 CL |
2037 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2038 | "seconds\n", | |
03bf4b70 | 2039 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2040 | queue_delayed_work(rpciod_workqueue, |
2041 | &transport->connect_worker, | |
2042 | xprt->reestablish_timeout); | |
03bf4b70 | 2043 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2044 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2045 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2046 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2047 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2048 | } else { |
46121cf7 | 2049 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2050 | queue_delayed_work(rpciod_workqueue, |
2051 | &transport->connect_worker, 0); | |
a246b010 CL |
2052 | } |
2053 | } | |
2054 | ||
e06799f9 TM |
2055 | static void xs_tcp_connect(struct rpc_task *task) |
2056 | { | |
2057 | struct rpc_xprt *xprt = task->tk_xprt; | |
2058 | ||
e06799f9 TM |
2059 | /* Exit if we need to wait for socket shutdown to complete */ |
2060 | if (test_bit(XPRT_CLOSING, &xprt->state)) | |
2061 | return; | |
2062 | xs_connect(task); | |
2063 | } | |
2064 | ||
262ca07d CL |
2065 | /** |
2066 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2067 | * @xprt: rpc_xprt struct containing statistics | |
2068 | * @seq: output file | |
2069 | * | |
2070 | */ | |
2071 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2072 | { | |
c8475461 CL |
2073 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2074 | ||
262ca07d | 2075 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
fbfffbd5 | 2076 | transport->srcport, |
262ca07d CL |
2077 | xprt->stat.bind_count, |
2078 | xprt->stat.sends, | |
2079 | xprt->stat.recvs, | |
2080 | xprt->stat.bad_xids, | |
2081 | xprt->stat.req_u, | |
2082 | xprt->stat.bklog_u); | |
2083 | } | |
2084 | ||
2085 | /** | |
2086 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2087 | * @xprt: rpc_xprt struct containing statistics | |
2088 | * @seq: output file | |
2089 | * | |
2090 | */ | |
2091 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2092 | { | |
c8475461 | 2093 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2094 | long idle_time = 0; |
2095 | ||
2096 | if (xprt_connected(xprt)) | |
2097 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2098 | ||
2099 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
fbfffbd5 | 2100 | transport->srcport, |
262ca07d CL |
2101 | xprt->stat.bind_count, |
2102 | xprt->stat.connect_count, | |
2103 | xprt->stat.connect_time, | |
2104 | idle_time, | |
2105 | xprt->stat.sends, | |
2106 | xprt->stat.recvs, | |
2107 | xprt->stat.bad_xids, | |
2108 | xprt->stat.req_u, | |
2109 | xprt->stat.bklog_u); | |
2110 | } | |
2111 | ||
4cfc7e60 RI |
2112 | /* |
2113 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2114 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2115 | * to use the server side send routines. | |
2116 | */ | |
2117 | void *bc_malloc(struct rpc_task *task, size_t size) | |
2118 | { | |
2119 | struct page *page; | |
2120 | struct rpc_buffer *buf; | |
2121 | ||
2122 | BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); | |
2123 | page = alloc_page(GFP_KERNEL); | |
2124 | ||
2125 | if (!page) | |
2126 | return NULL; | |
2127 | ||
2128 | buf = page_address(page); | |
2129 | buf->len = PAGE_SIZE; | |
2130 | ||
2131 | return buf->data; | |
2132 | } | |
2133 | ||
2134 | /* | |
2135 | * Free the space allocated in the bc_alloc routine | |
2136 | */ | |
2137 | void bc_free(void *buffer) | |
2138 | { | |
2139 | struct rpc_buffer *buf; | |
2140 | ||
2141 | if (!buffer) | |
2142 | return; | |
2143 | ||
2144 | buf = container_of(buffer, struct rpc_buffer, data); | |
2145 | free_page((unsigned long)buf); | |
2146 | } | |
2147 | ||
2148 | /* | |
2149 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2150 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2151 | */ | |
2152 | static int bc_sendto(struct rpc_rqst *req) | |
2153 | { | |
2154 | int len; | |
2155 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2156 | struct rpc_xprt *xprt = req->rq_xprt; | |
2157 | struct sock_xprt *transport = | |
2158 | container_of(xprt, struct sock_xprt, xprt); | |
2159 | struct socket *sock = transport->sock; | |
2160 | unsigned long headoff; | |
2161 | unsigned long tailoff; | |
2162 | ||
2163 | /* | |
2164 | * Set up the rpc header and record marker stuff | |
2165 | */ | |
2166 | xs_encode_tcp_record_marker(xbufp); | |
2167 | ||
2168 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2169 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2170 | len = svc_send_common(sock, xbufp, | |
2171 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2172 | xbufp->tail[0].iov_base, tailoff); | |
2173 | ||
2174 | if (len != xbufp->len) { | |
2175 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2176 | len = -EAGAIN; | |
2177 | } | |
2178 | ||
2179 | return len; | |
2180 | } | |
2181 | ||
2182 | /* | |
2183 | * The send routine. Borrows from svc_send | |
2184 | */ | |
2185 | static int bc_send_request(struct rpc_task *task) | |
2186 | { | |
2187 | struct rpc_rqst *req = task->tk_rqstp; | |
2188 | struct svc_xprt *xprt; | |
2189 | struct svc_sock *svsk; | |
2190 | u32 len; | |
2191 | ||
2192 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2193 | /* | |
2194 | * Get the server socket associated with this callback xprt | |
2195 | */ | |
2196 | xprt = req->rq_xprt->bc_xprt; | |
2197 | svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
2198 | ||
2199 | /* | |
2200 | * Grab the mutex to serialize data as the connection is shared | |
2201 | * with the fore channel | |
2202 | */ | |
2203 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2204 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2205 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2206 | return -EAGAIN; | |
2207 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2208 | } | |
2209 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2210 | len = -ENOTCONN; | |
2211 | else | |
2212 | len = bc_sendto(req); | |
2213 | mutex_unlock(&xprt->xpt_mutex); | |
2214 | ||
2215 | if (len > 0) | |
2216 | len = 0; | |
2217 | ||
2218 | return len; | |
2219 | } | |
2220 | ||
2221 | /* | |
2222 | * The close routine. Since this is client initiated, we do nothing | |
2223 | */ | |
2224 | ||
2225 | static void bc_close(struct rpc_xprt *xprt) | |
2226 | { | |
2227 | return; | |
2228 | } | |
2229 | ||
2230 | /* | |
2231 | * The xprt destroy routine. Again, because this connection is client | |
2232 | * initiated, we do nothing | |
2233 | */ | |
2234 | ||
2235 | static void bc_destroy(struct rpc_xprt *xprt) | |
2236 | { | |
2237 | return; | |
2238 | } | |
2239 | ||
262965f5 | 2240 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2241 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2242 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2243 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 2244 | .rpcbind = rpcb_getport_async, |
92200412 | 2245 | .set_port = xs_set_port, |
262965f5 | 2246 | .connect = xs_connect, |
02107148 CL |
2247 | .buf_alloc = rpc_malloc, |
2248 | .buf_free = rpc_free, | |
262965f5 | 2249 | .send_request = xs_udp_send_request, |
fe3aca29 | 2250 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2251 | .timer = xs_udp_timer, |
a58dd398 | 2252 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2253 | .close = xs_close, |
2254 | .destroy = xs_destroy, | |
262ca07d | 2255 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2256 | }; |
2257 | ||
2258 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2259 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2260 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 2261 | .rpcbind = rpcb_getport_async, |
92200412 | 2262 | .set_port = xs_set_port, |
e06799f9 | 2263 | .connect = xs_tcp_connect, |
02107148 CL |
2264 | .buf_alloc = rpc_malloc, |
2265 | .buf_free = rpc_free, | |
262965f5 | 2266 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2267 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
0d90ba1c RL |
2268 | #if defined(CONFIG_NFS_V4_1) |
2269 | .release_request = bc_release_request, | |
2270 | #endif /* CONFIG_NFS_V4_1 */ | |
f75e6745 | 2271 | .close = xs_tcp_close, |
9903cd1c | 2272 | .destroy = xs_destroy, |
262ca07d | 2273 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2274 | }; |
2275 | ||
4cfc7e60 RI |
2276 | /* |
2277 | * The rpc_xprt_ops for the server backchannel | |
2278 | */ | |
2279 | ||
2280 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2281 | .reserve_xprt = xprt_reserve_xprt, | |
2282 | .release_xprt = xprt_release_xprt, | |
2283 | .buf_alloc = bc_malloc, | |
2284 | .buf_free = bc_free, | |
2285 | .send_request = bc_send_request, | |
2286 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2287 | .close = bc_close, | |
2288 | .destroy = bc_destroy, | |
2289 | .print_stats = xs_tcp_print_stats, | |
2290 | }; | |
2291 | ||
3c341b0b | 2292 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
bc25571e | 2293 | unsigned int slot_table_size) |
c8541ecd CL |
2294 | { |
2295 | struct rpc_xprt *xprt; | |
ffc2e518 | 2296 | struct sock_xprt *new; |
c8541ecd | 2297 | |
96802a09 | 2298 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2299 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2300 | return ERR_PTR(-EBADF); |
2301 | } | |
2302 | ||
ffc2e518 CL |
2303 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
2304 | if (new == NULL) { | |
46121cf7 CL |
2305 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2306 | "rpc_xprt\n"); | |
c8541ecd CL |
2307 | return ERR_PTR(-ENOMEM); |
2308 | } | |
ffc2e518 | 2309 | xprt = &new->xprt; |
c8541ecd CL |
2310 | |
2311 | xprt->max_reqs = slot_table_size; | |
2312 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); | |
2313 | if (xprt->slot == NULL) { | |
2314 | kfree(xprt); | |
46121cf7 CL |
2315 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
2316 | "table\n"); | |
c8541ecd CL |
2317 | return ERR_PTR(-ENOMEM); |
2318 | } | |
2319 | ||
96802a09 FM |
2320 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2321 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2322 | if (args->srcaddr) |
fbfffbd5 | 2323 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
c8541ecd CL |
2324 | |
2325 | return xprt; | |
2326 | } | |
2327 | ||
2881ae74 TM |
2328 | static const struct rpc_timeout xs_udp_default_timeout = { |
2329 | .to_initval = 5 * HZ, | |
2330 | .to_maxval = 30 * HZ, | |
2331 | .to_increment = 5 * HZ, | |
2332 | .to_retries = 5, | |
2333 | }; | |
2334 | ||
9903cd1c CL |
2335 | /** |
2336 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2337 | * @args: rpc transport creation arguments |
9903cd1c CL |
2338 | * |
2339 | */ | |
483066d6 | 2340 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2341 | { |
8f9d5b1a | 2342 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2343 | struct rpc_xprt *xprt; |
c8475461 | 2344 | struct sock_xprt *transport; |
a246b010 | 2345 | |
96802a09 | 2346 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
2347 | if (IS_ERR(xprt)) |
2348 | return xprt; | |
c8475461 | 2349 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2350 | |
ec739ef0 | 2351 | xprt->prot = IPPROTO_UDP; |
808012fb | 2352 | xprt->tsh_size = 0; |
a246b010 CL |
2353 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2354 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2355 | ||
03bf4b70 CL |
2356 | xprt->bind_timeout = XS_BIND_TO; |
2357 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
2358 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
2359 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2360 | |
262965f5 | 2361 | xprt->ops = &xs_udp_ops; |
a246b010 | 2362 | |
ba7392bb | 2363 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2364 | |
8f9d5b1a CL |
2365 | switch (addr->sa_family) { |
2366 | case AF_INET: | |
2367 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2368 | xprt_set_bound(xprt); | |
2369 | ||
2370 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2371 | xs_udp_connect_worker4); | |
9dc3b095 | 2372 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2373 | break; |
2374 | case AF_INET6: | |
2375 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2376 | xprt_set_bound(xprt); | |
2377 | ||
2378 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2379 | xs_udp_connect_worker6); | |
9dc3b095 | 2380 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2381 | break; |
2382 | default: | |
2383 | kfree(xprt); | |
2384 | return ERR_PTR(-EAFNOSUPPORT); | |
2385 | } | |
2386 | ||
c740eff8 CL |
2387 | if (xprt_bound(xprt)) |
2388 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2389 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2390 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2391 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2392 | else | |
2393 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2394 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2395 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2396 | |
bc25571e TT |
2397 | if (try_module_get(THIS_MODULE)) |
2398 | return xprt; | |
2399 | ||
2400 | kfree(xprt->slot); | |
2401 | kfree(xprt); | |
2402 | return ERR_PTR(-EINVAL); | |
a246b010 CL |
2403 | } |
2404 | ||
2881ae74 TM |
2405 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2406 | .to_initval = 60 * HZ, | |
2407 | .to_maxval = 60 * HZ, | |
2408 | .to_retries = 2, | |
2409 | }; | |
2410 | ||
9903cd1c CL |
2411 | /** |
2412 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2413 | * @args: rpc transport creation arguments |
9903cd1c CL |
2414 | * |
2415 | */ | |
483066d6 | 2416 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2417 | { |
8f9d5b1a | 2418 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2419 | struct rpc_xprt *xprt; |
c8475461 | 2420 | struct sock_xprt *transport; |
a246b010 | 2421 | |
96802a09 | 2422 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
2423 | if (IS_ERR(xprt)) |
2424 | return xprt; | |
c8475461 | 2425 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2426 | |
ec739ef0 | 2427 | xprt->prot = IPPROTO_TCP; |
808012fb | 2428 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2429 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2430 | |
03bf4b70 CL |
2431 | xprt->bind_timeout = XS_BIND_TO; |
2432 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
2433 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2434 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2435 | |
262965f5 | 2436 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2437 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2438 | |
8f9d5b1a CL |
2439 | switch (addr->sa_family) { |
2440 | case AF_INET: | |
2441 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2442 | xprt_set_bound(xprt); | |
2443 | ||
9dc3b095 CL |
2444 | INIT_DELAYED_WORK(&transport->connect_worker, |
2445 | xs_tcp_connect_worker4); | |
2446 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); | |
8f9d5b1a CL |
2447 | break; |
2448 | case AF_INET6: | |
2449 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2450 | xprt_set_bound(xprt); | |
2451 | ||
9dc3b095 CL |
2452 | INIT_DELAYED_WORK(&transport->connect_worker, |
2453 | xs_tcp_connect_worker6); | |
2454 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); | |
8f9d5b1a CL |
2455 | break; |
2456 | default: | |
2457 | kfree(xprt); | |
2458 | return ERR_PTR(-EAFNOSUPPORT); | |
2459 | } | |
2460 | ||
c740eff8 CL |
2461 | if (xprt_bound(xprt)) |
2462 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2463 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2464 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2465 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2466 | else | |
2467 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2468 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2469 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2470 | ||
edb267a6 | 2471 | |
bc25571e TT |
2472 | if (try_module_get(THIS_MODULE)) |
2473 | return xprt; | |
2474 | ||
2475 | kfree(xprt->slot); | |
2476 | kfree(xprt); | |
2477 | return ERR_PTR(-EINVAL); | |
a246b010 | 2478 | } |
282b32e1 | 2479 | |
f300baba AB |
2480 | /** |
2481 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2482 | * @args: rpc transport creation arguments | |
2483 | * | |
2484 | */ | |
2485 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2486 | { | |
2487 | struct sockaddr *addr = args->dstaddr; | |
2488 | struct rpc_xprt *xprt; | |
2489 | struct sock_xprt *transport; | |
2490 | struct svc_sock *bc_sock; | |
2491 | ||
2492 | if (!args->bc_xprt) | |
2493 | ERR_PTR(-EINVAL); | |
2494 | ||
2495 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); | |
2496 | if (IS_ERR(xprt)) | |
2497 | return xprt; | |
2498 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2499 | ||
2500 | xprt->prot = IPPROTO_TCP; | |
2501 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2502 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2503 | xprt->timeout = &xs_tcp_default_timeout; | |
2504 | ||
2505 | /* backchannel */ | |
2506 | xprt_set_bound(xprt); | |
2507 | xprt->bind_timeout = 0; | |
2508 | xprt->connect_timeout = 0; | |
2509 | xprt->reestablish_timeout = 0; | |
2510 | xprt->idle_timeout = 0; | |
2511 | ||
2512 | /* | |
2513 | * The backchannel uses the same socket connection as the | |
2514 | * forechannel | |
2515 | */ | |
2516 | xprt->bc_xprt = args->bc_xprt; | |
2517 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
2518 | bc_sock->sk_bc_xprt = xprt; | |
2519 | transport->sock = bc_sock->sk_sock; | |
2520 | transport->inet = bc_sock->sk_sk; | |
2521 | ||
2522 | xprt->ops = &bc_tcp_ops; | |
2523 | ||
2524 | switch (addr->sa_family) { | |
2525 | case AF_INET: | |
2526 | xs_format_peer_addresses(xprt, "tcp", | |
2527 | RPCBIND_NETID_TCP); | |
2528 | break; | |
2529 | case AF_INET6: | |
2530 | xs_format_peer_addresses(xprt, "tcp", | |
2531 | RPCBIND_NETID_TCP6); | |
2532 | break; | |
2533 | default: | |
2534 | kfree(xprt); | |
2535 | return ERR_PTR(-EAFNOSUPPORT); | |
2536 | } | |
2537 | ||
2538 | if (xprt_bound(xprt)) | |
2539 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2540 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2541 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2542 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2543 | else | |
2544 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2545 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2546 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2547 | ||
2548 | /* | |
2549 | * Since we don't want connections for the backchannel, we set | |
2550 | * the xprt status to connected | |
2551 | */ | |
2552 | xprt_set_connected(xprt); | |
2553 | ||
2554 | ||
2555 | if (try_module_get(THIS_MODULE)) | |
2556 | return xprt; | |
2557 | kfree(xprt->slot); | |
2558 | kfree(xprt); | |
2559 | return ERR_PTR(-EINVAL); | |
2560 | } | |
2561 | ||
bc25571e TT |
2562 | static struct xprt_class xs_udp_transport = { |
2563 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2564 | .name = "udp", | |
2565 | .owner = THIS_MODULE, | |
f300baba | 2566 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
2567 | .setup = xs_setup_udp, |
2568 | }; | |
2569 | ||
2570 | static struct xprt_class xs_tcp_transport = { | |
2571 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2572 | .name = "tcp", | |
2573 | .owner = THIS_MODULE, | |
f300baba | 2574 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
2575 | .setup = xs_setup_tcp, |
2576 | }; | |
2577 | ||
f300baba AB |
2578 | static struct xprt_class xs_bc_tcp_transport = { |
2579 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
2580 | .name = "tcp NFSv4.1 backchannel", | |
2581 | .owner = THIS_MODULE, | |
2582 | .ident = XPRT_TRANSPORT_BC_TCP, | |
2583 | .setup = xs_setup_bc_tcp, | |
2584 | }; | |
2585 | ||
282b32e1 | 2586 | /** |
bc25571e | 2587 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2588 | * |
2589 | */ | |
2590 | int init_socket_xprt(void) | |
2591 | { | |
fbf76683 | 2592 | #ifdef RPC_DEBUG |
2b1bec5f | 2593 | if (!sunrpc_table_header) |
0b4d4147 | 2594 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2595 | #endif |
2596 | ||
bc25571e TT |
2597 | xprt_register_transport(&xs_udp_transport); |
2598 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 2599 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 2600 | |
282b32e1 CL |
2601 | return 0; |
2602 | } | |
2603 | ||
2604 | /** | |
bc25571e | 2605 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2606 | * |
2607 | */ | |
2608 | void cleanup_socket_xprt(void) | |
2609 | { | |
fbf76683 CL |
2610 | #ifdef RPC_DEBUG |
2611 | if (sunrpc_table_header) { | |
2612 | unregister_sysctl_table(sunrpc_table_header); | |
2613 | sunrpc_table_header = NULL; | |
2614 | } | |
2615 | #endif | |
bc25571e TT |
2616 | |
2617 | xprt_unregister_transport(&xs_udp_transport); | |
2618 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 2619 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 2620 | } |
cbf11071 TM |
2621 | |
2622 | static int param_set_uint_minmax(const char *val, struct kernel_param *kp, | |
2623 | unsigned int min, unsigned int max) | |
2624 | { | |
2625 | unsigned long num; | |
2626 | int ret; | |
2627 | ||
2628 | if (!val) | |
2629 | return -EINVAL; | |
2630 | ret = strict_strtoul(val, 0, &num); | |
2631 | if (ret == -EINVAL || num < min || num > max) | |
2632 | return -EINVAL; | |
2633 | *((unsigned int *)kp->arg) = num; | |
2634 | return 0; | |
2635 | } | |
2636 | ||
2637 | static int param_set_portnr(const char *val, struct kernel_param *kp) | |
2638 | { | |
2639 | return param_set_uint_minmax(val, kp, | |
2640 | RPC_MIN_RESVPORT, | |
2641 | RPC_MAX_RESVPORT); | |
2642 | } | |
2643 | ||
2644 | static int param_get_portnr(char *buffer, struct kernel_param *kp) | |
2645 | { | |
2646 | return param_get_uint(buffer, kp); | |
2647 | } | |
2648 | #define param_check_portnr(name, p) \ | |
2649 | __param_check(name, p, unsigned int); | |
2650 | ||
2651 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
2652 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
2653 | ||
2654 | static int param_set_slot_table_size(const char *val, struct kernel_param *kp) | |
2655 | { | |
2656 | return param_set_uint_minmax(val, kp, | |
2657 | RPC_MIN_SLOT_TABLE, | |
2658 | RPC_MAX_SLOT_TABLE); | |
2659 | } | |
2660 | ||
2661 | static int param_get_slot_table_size(char *buffer, struct kernel_param *kp) | |
2662 | { | |
2663 | return param_get_uint(buffer, kp); | |
2664 | } | |
2665 | #define param_check_slot_table_size(name, p) \ | |
2666 | __param_check(name, p, unsigned int); | |
2667 | ||
2668 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, | |
2669 | slot_table_size, 0644); | |
2670 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, | |
2671 | slot_table_size, 0644); | |
2672 |