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Commit | Line | Data |
---|---|---|
a246b010 CL |
1 | /* |
2 | * linux/net/sunrpc/xprtsock.c | |
3 | * | |
4 | * Client-side transport implementation for sockets. | |
5 | * | |
113aa838 AC |
6 | * TCP callback races fixes (C) 1998 Red Hat |
7 | * TCP send fixes (C) 1998 Red Hat | |
a246b010 CL |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> | |
10 | * | |
11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. | |
12 | * Fix behaviour when socket buffer is full. | |
13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/slab.h> | |
bc25571e | 23 | #include <linux/module.h> |
a246b010 | 24 | #include <linux/capability.h> |
a246b010 CL |
25 | #include <linux/pagemap.h> |
26 | #include <linux/errno.h> | |
27 | #include <linux/socket.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/net.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/udp.h> | |
32 | #include <linux/tcp.h> | |
33 | #include <linux/sunrpc/clnt.h> | |
02107148 | 34 | #include <linux/sunrpc/sched.h> |
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 | { | |
fbf76683 CL |
84 | .procname = "udp_slot_table_entries", |
85 | .data = &xprt_udp_slot_table_entries, | |
86 | .maxlen = sizeof(unsigned int), | |
87 | .mode = 0644, | |
6d456111 | 88 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
89 | .extra1 = &min_slot_table_size, |
90 | .extra2 = &max_slot_table_size | |
91 | }, | |
92 | { | |
fbf76683 CL |
93 | .procname = "tcp_slot_table_entries", |
94 | .data = &xprt_tcp_slot_table_entries, | |
95 | .maxlen = sizeof(unsigned int), | |
96 | .mode = 0644, | |
6d456111 | 97 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
98 | .extra1 = &min_slot_table_size, |
99 | .extra2 = &max_slot_table_size | |
100 | }, | |
101 | { | |
fbf76683 CL |
102 | .procname = "min_resvport", |
103 | .data = &xprt_min_resvport, | |
104 | .maxlen = sizeof(unsigned int), | |
105 | .mode = 0644, | |
6d456111 | 106 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
107 | .extra1 = &xprt_min_resvport_limit, |
108 | .extra2 = &xprt_max_resvport_limit | |
109 | }, | |
110 | { | |
fbf76683 CL |
111 | .procname = "max_resvport", |
112 | .data = &xprt_max_resvport, | |
113 | .maxlen = sizeof(unsigned int), | |
114 | .mode = 0644, | |
6d456111 | 115 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
116 | .extra1 = &xprt_min_resvport_limit, |
117 | .extra2 = &xprt_max_resvport_limit | |
118 | }, | |
25fe6142 TM |
119 | { |
120 | .procname = "tcp_fin_timeout", | |
121 | .data = &xs_tcp_fin_timeout, | |
122 | .maxlen = sizeof(xs_tcp_fin_timeout), | |
123 | .mode = 0644, | |
6d456111 | 124 | .proc_handler = proc_dointvec_jiffies, |
fbf76683 | 125 | }, |
f8572d8f | 126 | { }, |
fbf76683 CL |
127 | }; |
128 | ||
129 | static ctl_table sunrpc_table[] = { | |
130 | { | |
fbf76683 CL |
131 | .procname = "sunrpc", |
132 | .mode = 0555, | |
133 | .child = xs_tunables_table | |
134 | }, | |
f8572d8f | 135 | { }, |
fbf76683 CL |
136 | }; |
137 | ||
138 | #endif | |
139 | ||
03bf4b70 CL |
140 | /* |
141 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
142 | * synchronous, but we set a timeout anyway in case of resource | |
143 | * exhaustion on the local host. | |
144 | */ | |
145 | #define XS_UDP_CONN_TO (5U * HZ) | |
146 | ||
147 | /* | |
148 | * Wait duration for an RPC TCP connection to be established. Solaris | |
149 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
150 | * long a server takes to reboot. | |
151 | */ | |
152 | #define XS_TCP_CONN_TO (60U * HZ) | |
153 | ||
154 | /* | |
155 | * Wait duration for a reply from the RPC portmapper. | |
156 | */ | |
157 | #define XS_BIND_TO (60U * HZ) | |
158 | ||
159 | /* | |
160 | * Delay if a UDP socket connect error occurs. This is most likely some | |
161 | * kind of resource problem on the local host. | |
162 | */ | |
163 | #define XS_UDP_REEST_TO (2U * HZ) | |
164 | ||
165 | /* | |
166 | * The reestablish timeout allows clients to delay for a bit before attempting | |
167 | * to reconnect to a server that just dropped our connection. | |
168 | * | |
169 | * We implement an exponential backoff when trying to reestablish a TCP | |
170 | * transport connection with the server. Some servers like to drop a TCP | |
171 | * connection when they are overworked, so we start with a short timeout and | |
172 | * increase over time if the server is down or not responding. | |
173 | */ | |
174 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
175 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
176 | ||
177 | /* | |
178 | * TCP idle timeout; client drops the transport socket if it is idle | |
179 | * for this long. Note that we also timeout UDP sockets to prevent | |
180 | * holding port numbers when there is no RPC traffic. | |
181 | */ | |
182 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
183 | ||
a246b010 CL |
184 | #ifdef RPC_DEBUG |
185 | # undef RPC_DEBUG_DATA | |
9903cd1c | 186 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
187 | #endif |
188 | ||
a246b010 | 189 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 190 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 191 | { |
9903cd1c CL |
192 | u8 *buf = (u8 *) packet; |
193 | int j; | |
a246b010 | 194 | |
46121cf7 | 195 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
196 | for (j = 0; j < count && j < 128; j += 4) { |
197 | if (!(j & 31)) { | |
198 | if (j) | |
199 | dprintk("\n"); | |
200 | dprintk("0x%04x ", j); | |
201 | } | |
202 | dprintk("%02x%02x%02x%02x ", | |
203 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
204 | } | |
205 | dprintk("\n"); | |
206 | } | |
207 | #else | |
9903cd1c | 208 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
209 | { |
210 | /* NOP */ | |
211 | } | |
212 | #endif | |
213 | ||
ffc2e518 CL |
214 | struct sock_xprt { |
215 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
216 | |
217 | /* | |
218 | * Network layer | |
219 | */ | |
220 | struct socket * sock; | |
221 | struct sock * inet; | |
51971139 CL |
222 | |
223 | /* | |
224 | * State of TCP reply receive | |
225 | */ | |
226 | __be32 tcp_fraghdr, | |
227 | tcp_xid; | |
228 | ||
229 | u32 tcp_offset, | |
230 | tcp_reclen; | |
231 | ||
232 | unsigned long tcp_copied, | |
233 | tcp_flags; | |
c8475461 CL |
234 | |
235 | /* | |
236 | * Connection of transports | |
237 | */ | |
34161db6 | 238 | struct delayed_work connect_worker; |
fbfffbd5 CL |
239 | struct sockaddr_storage srcaddr; |
240 | unsigned short srcport; | |
7c6e066e CL |
241 | |
242 | /* | |
243 | * UDP socket buffer size parameters | |
244 | */ | |
245 | size_t rcvsize, | |
246 | sndsize; | |
314dfd79 CL |
247 | |
248 | /* | |
249 | * Saved socket callback addresses | |
250 | */ | |
251 | void (*old_data_ready)(struct sock *, int); | |
252 | void (*old_state_change)(struct sock *); | |
253 | void (*old_write_space)(struct sock *); | |
2a9e1cfa | 254 | void (*old_error_report)(struct sock *); |
ffc2e518 CL |
255 | }; |
256 | ||
e136d092 CL |
257 | /* |
258 | * TCP receive state flags | |
259 | */ | |
260 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
261 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
262 | #define TCP_RCV_COPY_XID (1UL << 2) | |
263 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
264 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
265 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
266 | |
267 | /* | |
268 | * TCP RPC flags | |
269 | */ | |
f4a2e418 | 270 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 271 | |
95392c59 CL |
272 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
273 | { | |
274 | return (struct sockaddr *) &xprt->addr; | |
275 | } | |
276 | ||
277 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) | |
edb267a6 | 278 | { |
95392c59 CL |
279 | return (struct sockaddr_in *) &xprt->addr; |
280 | } | |
281 | ||
282 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
283 | { | |
284 | return (struct sockaddr_in6 *) &xprt->addr; | |
285 | } | |
286 | ||
c877b849 | 287 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 288 | { |
c877b849 | 289 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
290 | struct sockaddr_in6 *sin6; |
291 | struct sockaddr_in *sin; | |
c877b849 | 292 | char buf[128]; |
edb267a6 | 293 | |
c877b849 CL |
294 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
295 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
fbfe3cc6 | 296 | |
9dc3b095 CL |
297 | switch (sap->sa_family) { |
298 | case AF_INET: | |
299 | sin = xs_addr_in(xprt); | |
300 | (void)snprintf(buf, sizeof(buf), "%02x%02x%02x%02x", | |
301 | NIPQUAD(sin->sin_addr.s_addr)); | |
302 | break; | |
303 | case AF_INET6: | |
304 | sin6 = xs_addr_in6(xprt); | |
305 | (void)snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); | |
306 | break; | |
307 | default: | |
308 | BUG(); | |
756805e7 | 309 | } |
9dc3b095 | 310 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
311 | } |
312 | ||
9dc3b095 | 313 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 314 | { |
9dc3b095 CL |
315 | struct sockaddr *sap = xs_addr(xprt); |
316 | char buf[128]; | |
4b6473fb | 317 | |
c877b849 CL |
318 | (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
319 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); | |
4b6473fb | 320 | |
c877b849 CL |
321 | (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
322 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); | |
323 | } | |
4b6473fb | 324 | |
9dc3b095 CL |
325 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
326 | const char *protocol, | |
327 | const char *netid) | |
c877b849 | 328 | { |
b454ae90 | 329 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 330 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 331 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 332 | xs_format_common_peer_ports(xprt); |
edb267a6 | 333 | } |
4b6473fb | 334 | |
9dc3b095 | 335 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 336 | { |
9dc3b095 CL |
337 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
338 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 339 | |
9dc3b095 | 340 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
341 | } |
342 | ||
343 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
344 | { | |
33e01dc7 CL |
345 | unsigned int i; |
346 | ||
347 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
348 | switch (i) { | |
349 | case RPC_DISPLAY_PROTO: | |
350 | case RPC_DISPLAY_NETID: | |
351 | continue; | |
352 | default: | |
353 | kfree(xprt->address_strings[i]); | |
354 | } | |
edb267a6 CL |
355 | } |
356 | ||
b4b5cc85 CL |
357 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
358 | ||
24c5684b | 359 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 360 | { |
b4b5cc85 CL |
361 | struct msghdr msg = { |
362 | .msg_name = addr, | |
363 | .msg_namelen = addrlen, | |
24c5684b TM |
364 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
365 | }; | |
366 | struct kvec iov = { | |
367 | .iov_base = vec->iov_base + base, | |
368 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
369 | }; |
370 | ||
24c5684b | 371 | if (iov.iov_len != 0) |
b4b5cc85 CL |
372 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
373 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
374 | } | |
375 | ||
24c5684b | 376 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 377 | { |
24c5684b TM |
378 | struct page **ppage; |
379 | unsigned int remainder; | |
380 | int err, sent = 0; | |
381 | ||
382 | remainder = xdr->page_len - base; | |
383 | base += xdr->page_base; | |
384 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
385 | base &= ~PAGE_MASK; | |
386 | for(;;) { | |
387 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
388 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 389 | |
24c5684b TM |
390 | remainder -= len; |
391 | if (remainder != 0 || more) | |
392 | flags |= MSG_MORE; | |
393 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
394 | if (remainder == 0 || err != len) | |
395 | break; | |
396 | sent += err; | |
397 | ppage++; | |
398 | base = 0; | |
399 | } | |
400 | if (sent == 0) | |
401 | return err; | |
402 | if (err > 0) | |
403 | sent += err; | |
404 | return sent; | |
b4b5cc85 CL |
405 | } |
406 | ||
9903cd1c CL |
407 | /** |
408 | * xs_sendpages - write pages directly to a socket | |
409 | * @sock: socket to send on | |
410 | * @addr: UDP only -- address of destination | |
411 | * @addrlen: UDP only -- length of destination address | |
412 | * @xdr: buffer containing this request | |
413 | * @base: starting position in the buffer | |
414 | * | |
a246b010 | 415 | */ |
24c5684b | 416 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 417 | { |
24c5684b TM |
418 | unsigned int remainder = xdr->len - base; |
419 | int err, sent = 0; | |
a246b010 | 420 | |
262965f5 | 421 | if (unlikely(!sock)) |
fba91afb | 422 | return -ENOTSOCK; |
262965f5 CL |
423 | |
424 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
425 | if (base != 0) { |
426 | addr = NULL; | |
427 | addrlen = 0; | |
428 | } | |
262965f5 | 429 | |
24c5684b TM |
430 | if (base < xdr->head[0].iov_len || addr != NULL) { |
431 | unsigned int len = xdr->head[0].iov_len - base; | |
432 | remainder -= len; | |
433 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
434 | if (remainder == 0 || err != len) | |
a246b010 | 435 | goto out; |
24c5684b | 436 | sent += err; |
a246b010 CL |
437 | base = 0; |
438 | } else | |
24c5684b | 439 | base -= xdr->head[0].iov_len; |
a246b010 | 440 | |
24c5684b TM |
441 | if (base < xdr->page_len) { |
442 | unsigned int len = xdr->page_len - base; | |
443 | remainder -= len; | |
444 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
445 | if (remainder == 0 || err != len) | |
a246b010 | 446 | goto out; |
24c5684b | 447 | sent += err; |
a246b010 | 448 | base = 0; |
24c5684b TM |
449 | } else |
450 | base -= xdr->page_len; | |
451 | ||
452 | if (base >= xdr->tail[0].iov_len) | |
453 | return sent; | |
454 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 455 | out: |
24c5684b TM |
456 | if (sent == 0) |
457 | return err; | |
458 | if (err > 0) | |
459 | sent += err; | |
460 | return sent; | |
a246b010 CL |
461 | } |
462 | ||
b6ddf64f TM |
463 | static void xs_nospace_callback(struct rpc_task *task) |
464 | { | |
465 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
466 | ||
467 | transport->inet->sk_write_pending--; | |
468 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
469 | } | |
470 | ||
9903cd1c | 471 | /** |
262965f5 CL |
472 | * xs_nospace - place task on wait queue if transmit was incomplete |
473 | * @task: task to put to sleep | |
9903cd1c | 474 | * |
a246b010 | 475 | */ |
5e3771ce | 476 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 477 | { |
262965f5 CL |
478 | struct rpc_rqst *req = task->tk_rqstp; |
479 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 480 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
5e3771ce | 481 | int ret = 0; |
a246b010 | 482 | |
46121cf7 | 483 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
484 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
485 | req->rq_slen); | |
486 | ||
b6ddf64f TM |
487 | /* Protect against races with write_space */ |
488 | spin_lock_bh(&xprt->transport_lock); | |
489 | ||
490 | /* Don't race with disconnect */ | |
491 | if (xprt_connected(xprt)) { | |
492 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
5e3771ce | 493 | ret = -EAGAIN; |
b6ddf64f TM |
494 | /* |
495 | * Notify TCP that we're limited by the application | |
496 | * window size | |
497 | */ | |
498 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
499 | transport->inet->sk_write_pending++; | |
500 | /* ...and wait for more buffer space */ | |
501 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
502 | } | |
503 | } else { | |
504 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 505 | ret = -ENOTCONN; |
b6ddf64f | 506 | } |
262965f5 | 507 | |
b6ddf64f | 508 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 509 | return ret; |
262965f5 CL |
510 | } |
511 | ||
512 | /** | |
513 | * xs_udp_send_request - write an RPC request to a UDP socket | |
514 | * @task: address of RPC task that manages the state of an RPC request | |
515 | * | |
516 | * Return values: | |
517 | * 0: The request has been sent | |
518 | * EAGAIN: The socket was blocked, please call again later to | |
519 | * complete the request | |
520 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
521 | * other: Some other error occured, the request was not sent | |
522 | */ | |
523 | static int xs_udp_send_request(struct rpc_task *task) | |
524 | { | |
525 | struct rpc_rqst *req = task->tk_rqstp; | |
526 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 527 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
528 | struct xdr_buf *xdr = &req->rq_snd_buf; |
529 | int status; | |
a246b010 | 530 | |
9903cd1c | 531 | xs_pktdump("packet data:", |
a246b010 CL |
532 | req->rq_svec->iov_base, |
533 | req->rq_svec->iov_len); | |
534 | ||
01d37c42 TM |
535 | if (!xprt_bound(xprt)) |
536 | return -ENOTCONN; | |
ee0ac0c2 | 537 | status = xs_sendpages(transport->sock, |
95392c59 | 538 | xs_addr(xprt), |
ee0ac0c2 CL |
539 | xprt->addrlen, xdr, |
540 | req->rq_bytes_sent); | |
a246b010 | 541 | |
46121cf7 | 542 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 543 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 544 | |
2199700f TM |
545 | if (status >= 0) { |
546 | task->tk_bytes_sent += status; | |
547 | if (status >= req->rq_slen) | |
548 | return 0; | |
549 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 550 | status = -EAGAIN; |
2199700f | 551 | } |
c8485e4d TM |
552 | if (!transport->sock) |
553 | goto out; | |
a246b010 | 554 | |
262965f5 | 555 | switch (status) { |
fba91afb TM |
556 | case -ENOTSOCK: |
557 | status = -ENOTCONN; | |
558 | /* Should we call xs_close() here? */ | |
559 | break; | |
b6ddf64f | 560 | case -EAGAIN: |
5e3771ce | 561 | status = xs_nospace(task); |
b6ddf64f | 562 | break; |
c8485e4d TM |
563 | default: |
564 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
565 | -status); | |
262965f5 CL |
566 | case -ENETUNREACH: |
567 | case -EPIPE: | |
a246b010 CL |
568 | case -ECONNREFUSED: |
569 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 570 | * prompts ECONNREFUSED. */ |
b6ddf64f | 571 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 572 | } |
c8485e4d | 573 | out: |
262965f5 | 574 | return status; |
a246b010 CL |
575 | } |
576 | ||
e06799f9 TM |
577 | /** |
578 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
579 | * @xprt: transport | |
580 | * | |
581 | * Initiates a graceful shutdown of the TCP socket by calling the | |
582 | * equivalent of shutdown(SHUT_WR); | |
583 | */ | |
584 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
585 | { | |
586 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
587 | struct socket *sock = transport->sock; | |
588 | ||
589 | if (sock != NULL) | |
590 | kernel_sock_shutdown(sock, SHUT_WR); | |
591 | } | |
592 | ||
808012fb CL |
593 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
594 | { | |
595 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
596 | rpc_fraghdr *base = buf->head[0].iov_base; | |
597 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
598 | } | |
599 | ||
9903cd1c | 600 | /** |
262965f5 | 601 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
602 | * @task: address of RPC task that manages the state of an RPC request |
603 | * | |
604 | * Return values: | |
262965f5 CL |
605 | * 0: The request has been sent |
606 | * EAGAIN: The socket was blocked, please call again later to | |
607 | * complete the request | |
608 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
609 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
610 | * |
611 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 612 | * if sendmsg is not able to make progress? |
9903cd1c | 613 | */ |
262965f5 | 614 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
615 | { |
616 | struct rpc_rqst *req = task->tk_rqstp; | |
617 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 618 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 619 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 620 | int status; |
a246b010 | 621 | |
808012fb | 622 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 623 | |
262965f5 CL |
624 | xs_pktdump("packet data:", |
625 | req->rq_svec->iov_base, | |
626 | req->rq_svec->iov_len); | |
a246b010 CL |
627 | |
628 | /* Continue transmitting the packet/record. We must be careful | |
629 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 630 | * called sendmsg(). */ |
a246b010 | 631 | while (1) { |
ee0ac0c2 CL |
632 | status = xs_sendpages(transport->sock, |
633 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 634 | |
46121cf7 | 635 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 636 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 637 | |
262965f5 | 638 | if (unlikely(status < 0)) |
a246b010 | 639 | break; |
a246b010 | 640 | |
262965f5 CL |
641 | /* If we've sent the entire packet, immediately |
642 | * reset the count of bytes sent. */ | |
643 | req->rq_bytes_sent += status; | |
ef759a2e | 644 | task->tk_bytes_sent += status; |
262965f5 CL |
645 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
646 | req->rq_bytes_sent = 0; | |
647 | return 0; | |
648 | } | |
a246b010 | 649 | |
06b4b681 TM |
650 | if (status != 0) |
651 | continue; | |
a246b010 | 652 | status = -EAGAIN; |
06b4b681 | 653 | break; |
a246b010 | 654 | } |
c8485e4d TM |
655 | if (!transport->sock) |
656 | goto out; | |
a246b010 | 657 | |
262965f5 | 658 | switch (status) { |
fba91afb TM |
659 | case -ENOTSOCK: |
660 | status = -ENOTCONN; | |
661 | /* Should we call xs_close() here? */ | |
662 | break; | |
262965f5 | 663 | case -EAGAIN: |
5e3771ce | 664 | status = xs_nospace(task); |
262965f5 | 665 | break; |
c8485e4d TM |
666 | default: |
667 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
668 | -status); | |
262965f5 | 669 | case -ECONNRESET: |
55420c24 | 670 | case -EPIPE: |
2a9e1cfa TM |
671 | xs_tcp_shutdown(xprt); |
672 | case -ECONNREFUSED: | |
262965f5 | 673 | case -ENOTCONN: |
b6ddf64f | 674 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 675 | } |
c8485e4d | 676 | out: |
a246b010 CL |
677 | return status; |
678 | } | |
679 | ||
e0ab53de TM |
680 | /** |
681 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
682 | * @xprt: transport | |
683 | * @task: rpc task | |
684 | * | |
685 | * This cleans up if an error causes us to abort the transmission of a request. | |
686 | * In this case, the socket may need to be reset in order to avoid confusing | |
687 | * the server. | |
688 | */ | |
689 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
690 | { | |
691 | struct rpc_rqst *req; | |
692 | ||
693 | if (task != xprt->snd_task) | |
694 | return; | |
695 | if (task == NULL) | |
696 | goto out_release; | |
697 | req = task->tk_rqstp; | |
698 | if (req->rq_bytes_sent == 0) | |
699 | goto out_release; | |
700 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
701 | goto out_release; | |
702 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
703 | out_release: | |
704 | xprt_release_xprt(xprt, task); | |
705 | } | |
706 | ||
2a9e1cfa TM |
707 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
708 | { | |
709 | transport->old_data_ready = sk->sk_data_ready; | |
710 | transport->old_state_change = sk->sk_state_change; | |
711 | transport->old_write_space = sk->sk_write_space; | |
712 | transport->old_error_report = sk->sk_error_report; | |
713 | } | |
714 | ||
715 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
716 | { | |
717 | sk->sk_data_ready = transport->old_data_ready; | |
718 | sk->sk_state_change = transport->old_state_change; | |
719 | sk->sk_write_space = transport->old_write_space; | |
720 | sk->sk_error_report = transport->old_error_report; | |
721 | } | |
722 | ||
fe315e76 | 723 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 724 | { |
ee0ac0c2 CL |
725 | struct socket *sock = transport->sock; |
726 | struct sock *sk = transport->inet; | |
a246b010 | 727 | |
fe315e76 CL |
728 | if (sk == NULL) |
729 | return; | |
9903cd1c | 730 | |
a246b010 | 731 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
732 | transport->inet = NULL; |
733 | transport->sock = NULL; | |
a246b010 | 734 | |
9903cd1c | 735 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
736 | |
737 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
738 | write_unlock_bh(&sk->sk_callback_lock); |
739 | ||
9903cd1c | 740 | sk->sk_no_check = 0; |
a246b010 CL |
741 | |
742 | sock_release(sock); | |
fe315e76 CL |
743 | } |
744 | ||
745 | /** | |
746 | * xs_close - close a socket | |
747 | * @xprt: transport | |
748 | * | |
749 | * This is used when all requests are complete; ie, no DRC state remains | |
750 | * on the server we want to save. | |
f75e6745 TM |
751 | * |
752 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
753 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
754 | */ |
755 | static void xs_close(struct rpc_xprt *xprt) | |
756 | { | |
757 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
758 | ||
759 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
760 | ||
761 | xs_reset_transport(transport); | |
61d0a8e6 | 762 | xprt->reestablish_timeout = 0; |
fe315e76 | 763 | |
632e3bdc | 764 | smp_mb__before_clear_bit(); |
7d1e8255 | 765 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 766 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 767 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 768 | smp_mb__after_clear_bit(); |
62da3b24 | 769 | xprt_disconnect_done(xprt); |
a246b010 CL |
770 | } |
771 | ||
f75e6745 TM |
772 | static void xs_tcp_close(struct rpc_xprt *xprt) |
773 | { | |
774 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
775 | xs_close(xprt); | |
776 | else | |
777 | xs_tcp_shutdown(xprt); | |
778 | } | |
779 | ||
9903cd1c CL |
780 | /** |
781 | * xs_destroy - prepare to shutdown a transport | |
782 | * @xprt: doomed transport | |
783 | * | |
784 | */ | |
785 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 786 | { |
c8475461 CL |
787 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
788 | ||
46121cf7 | 789 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 790 | |
c1384c9c | 791 | cancel_rearming_delayed_work(&transport->connect_worker); |
a246b010 | 792 | |
9903cd1c | 793 | xs_close(xprt); |
edb267a6 | 794 | xs_free_peer_addresses(xprt); |
a246b010 | 795 | kfree(xprt->slot); |
c8541ecd | 796 | kfree(xprt); |
bc25571e | 797 | module_put(THIS_MODULE); |
a246b010 CL |
798 | } |
799 | ||
9903cd1c CL |
800 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
801 | { | |
802 | return (struct rpc_xprt *) sk->sk_user_data; | |
803 | } | |
804 | ||
805 | /** | |
806 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
807 | * @sk: socket with data to read | |
808 | * @len: how much data to read | |
809 | * | |
a246b010 | 810 | */ |
9903cd1c | 811 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 812 | { |
9903cd1c CL |
813 | struct rpc_task *task; |
814 | struct rpc_xprt *xprt; | |
a246b010 | 815 | struct rpc_rqst *rovr; |
9903cd1c | 816 | struct sk_buff *skb; |
a246b010 | 817 | int err, repsize, copied; |
d8ed029d AD |
818 | u32 _xid; |
819 | __be32 *xp; | |
a246b010 CL |
820 | |
821 | read_lock(&sk->sk_callback_lock); | |
46121cf7 | 822 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 823 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 824 | goto out; |
a246b010 CL |
825 | |
826 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
827 | goto out; | |
828 | ||
829 | if (xprt->shutdown) | |
830 | goto dropit; | |
831 | ||
832 | repsize = skb->len - sizeof(struct udphdr); | |
833 | if (repsize < 4) { | |
46121cf7 | 834 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
835 | goto dropit; |
836 | } | |
837 | ||
838 | /* Copy the XID from the skb... */ | |
839 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
840 | sizeof(_xid), &_xid); | |
841 | if (xp == NULL) | |
842 | goto dropit; | |
843 | ||
844 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 845 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
846 | rovr = xprt_lookup_rqst(xprt, *xp); |
847 | if (!rovr) | |
848 | goto out_unlock; | |
849 | task = rovr->rq_task; | |
850 | ||
a246b010 CL |
851 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
852 | copied = repsize; | |
853 | ||
854 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
855 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
856 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 857 | goto out_unlock; |
1781f7f5 HX |
858 | } |
859 | ||
860 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 CL |
861 | |
862 | /* Something worked... */ | |
adf30907 | 863 | dst_confirm(skb_dst(skb)); |
a246b010 | 864 | |
1570c1e4 CL |
865 | xprt_adjust_cwnd(task, copied); |
866 | xprt_update_rtt(task); | |
867 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
868 | |
869 | out_unlock: | |
4a0f8c04 | 870 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
871 | dropit: |
872 | skb_free_datagram(sk, skb); | |
873 | out: | |
874 | read_unlock(&sk->sk_callback_lock); | |
875 | } | |
876 | ||
dd456471 | 877 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 878 | { |
51971139 | 879 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
880 | size_t len, used; |
881 | char *p; | |
882 | ||
51971139 CL |
883 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
884 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 885 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 886 | transport->tcp_offset += used; |
a246b010 CL |
887 | if (used != len) |
888 | return; | |
808012fb | 889 | |
51971139 CL |
890 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
891 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 892 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 893 | else |
e136d092 | 894 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 895 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 896 | |
e136d092 | 897 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 898 | transport->tcp_offset = 0; |
808012fb | 899 | |
a246b010 | 900 | /* Sanity check of the record length */ |
18dca02a | 901 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 902 | dprintk("RPC: invalid TCP record fragment length\n"); |
3ebb067d | 903 | xprt_force_disconnect(xprt); |
9903cd1c | 904 | return; |
a246b010 | 905 | } |
46121cf7 | 906 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 907 | transport->tcp_reclen); |
a246b010 CL |
908 | } |
909 | ||
51971139 | 910 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 911 | { |
51971139 | 912 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 913 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 914 | transport->tcp_offset = 0; |
e136d092 CL |
915 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
916 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
917 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 918 | transport->tcp_copied = 0; |
a246b010 CL |
919 | } |
920 | } | |
921 | } | |
922 | ||
dd456471 | 923 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
924 | { |
925 | size_t len, used; | |
926 | char *p; | |
927 | ||
51971139 | 928 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 929 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 930 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 931 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 932 | transport->tcp_offset += used; |
a246b010 CL |
933 | if (used != len) |
934 | return; | |
e136d092 | 935 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 936 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 937 | transport->tcp_copied = 4; |
18dca02a RL |
938 | dprintk("RPC: reading %s XID %08x\n", |
939 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
940 | : "request with", | |
51971139 CL |
941 | ntohl(transport->tcp_xid)); |
942 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
943 | } |
944 | ||
18dca02a RL |
945 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
946 | struct xdr_skb_reader *desc) | |
a246b010 | 947 | { |
18dca02a RL |
948 | size_t len, used; |
949 | u32 offset; | |
950 | __be32 calldir; | |
951 | ||
952 | /* | |
953 | * We want transport->tcp_offset to be 8 at the end of this routine | |
954 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
955 | * When this function is called for the first time, | |
956 | * transport->tcp_offset is 4 (after having already read the xid). | |
957 | */ | |
958 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
959 | len = sizeof(calldir) - offset; | |
960 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); | |
961 | used = xdr_skb_read_bits(desc, &calldir, len); | |
962 | transport->tcp_offset += used; | |
963 | if (used != len) | |
964 | return; | |
f4a2e418 RL |
965 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
966 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
18dca02a | 967 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
f4a2e418 RL |
968 | /* |
969 | * We don't yet have the XDR buffer, so we will write the calldir | |
970 | * out after we get the buffer from the 'struct rpc_rqst' | |
971 | */ | |
18dca02a RL |
972 | if (ntohl(calldir) == RPC_REPLY) |
973 | transport->tcp_flags |= TCP_RPC_REPLY; | |
974 | else | |
975 | transport->tcp_flags &= ~TCP_RPC_REPLY; | |
976 | dprintk("RPC: reading %s CALL/REPLY flag %08x\n", | |
977 | (transport->tcp_flags & TCP_RPC_REPLY) ? | |
978 | "reply for" : "request with", calldir); | |
979 | xs_tcp_check_fraghdr(transport); | |
980 | } | |
981 | ||
44b98efd RL |
982 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
983 | struct xdr_skb_reader *desc, | |
984 | struct rpc_rqst *req) | |
a246b010 | 985 | { |
44b98efd RL |
986 | struct sock_xprt *transport = |
987 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
988 | struct xdr_buf *rcvbuf; |
989 | size_t len; | |
990 | ssize_t r; | |
991 | ||
a246b010 | 992 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
993 | |
994 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
995 | /* | |
996 | * Save the RPC direction in the XDR buffer | |
997 | */ | |
998 | __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? | |
999 | htonl(RPC_REPLY) : 0; | |
1000 | ||
1001 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, | |
1002 | &calldir, sizeof(calldir)); | |
1003 | transport->tcp_copied += sizeof(calldir); | |
1004 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; | |
a246b010 CL |
1005 | } |
1006 | ||
a246b010 | 1007 | len = desc->count; |
51971139 | 1008 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1009 | struct xdr_skb_reader my_desc; |
a246b010 | 1010 | |
51971139 | 1011 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1012 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1013 | my_desc.count = len; | |
51971139 | 1014 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1015 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1016 | desc->count -= r; |
1017 | desc->offset += r; | |
1018 | } else | |
51971139 | 1019 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1020 | desc, xdr_skb_read_bits); |
a246b010 CL |
1021 | |
1022 | if (r > 0) { | |
51971139 CL |
1023 | transport->tcp_copied += r; |
1024 | transport->tcp_offset += r; | |
a246b010 CL |
1025 | } |
1026 | if (r != len) { | |
1027 | /* Error when copying to the receive buffer, | |
1028 | * usually because we weren't able to allocate | |
1029 | * additional buffer pages. All we can do now | |
e136d092 | 1030 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1031 | * will not receive any additional updates, |
1032 | * and time out. | |
1033 | * Any remaining data from this record will | |
1034 | * be discarded. | |
1035 | */ | |
e136d092 | 1036 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1037 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1038 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1039 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1040 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1041 | xprt, transport->tcp_copied, | |
1042 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1043 | return; |
a246b010 CL |
1044 | } |
1045 | ||
46121cf7 | 1046 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1047 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1048 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1049 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1050 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1051 | |
1052 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1053 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1054 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1055 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1056 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 CL |
1057 | } |
1058 | ||
44b98efd RL |
1059 | return; |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Finds the request corresponding to the RPC xid and invokes the common | |
1064 | * tcp read code to read the data. | |
1065 | */ | |
1066 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1067 | struct xdr_skb_reader *desc) | |
1068 | { | |
1069 | struct sock_xprt *transport = | |
1070 | container_of(xprt, struct sock_xprt, xprt); | |
1071 | struct rpc_rqst *req; | |
1072 | ||
1073 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1074 | ||
1075 | /* Find and lock the request corresponding to this xid */ | |
1076 | spin_lock(&xprt->transport_lock); | |
1077 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1078 | if (!req) { | |
1079 | dprintk("RPC: XID %08x request not found!\n", | |
1080 | ntohl(transport->tcp_xid)); | |
1081 | spin_unlock(&xprt->transport_lock); | |
1082 | return -1; | |
1083 | } | |
1084 | ||
1085 | xs_tcp_read_common(xprt, desc, req); | |
1086 | ||
e136d092 | 1087 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1088 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1089 | |
4a0f8c04 | 1090 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1091 | return 0; |
1092 | } | |
1093 | ||
1094 | #if defined(CONFIG_NFS_V4_1) | |
1095 | /* | |
1096 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1097 | * tcp read code to read the data. The result is placed in the callback | |
1098 | * queue. | |
1099 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1100 | * connection and return -1. | |
1101 | */ | |
1102 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1103 | struct xdr_skb_reader *desc) | |
1104 | { | |
1105 | struct sock_xprt *transport = | |
1106 | container_of(xprt, struct sock_xprt, xprt); | |
1107 | struct rpc_rqst *req; | |
1108 | ||
1109 | req = xprt_alloc_bc_request(xprt); | |
1110 | if (req == NULL) { | |
1111 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1112 | xprt_force_disconnect(xprt); | |
1113 | return -1; | |
1114 | } | |
1115 | ||
1116 | req->rq_xid = transport->tcp_xid; | |
1117 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1118 | xs_tcp_read_common(xprt, desc, req); | |
1119 | ||
1120 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1121 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1122 | ||
1123 | /* | |
1124 | * Add callback request to callback list. The callback | |
1125 | * service sleeps on the sv_cb_waitq waiting for new | |
1126 | * requests. Wake it up after adding enqueing the | |
1127 | * request. | |
1128 | */ | |
1129 | dprintk("RPC: add callback request to list\n"); | |
1130 | spin_lock(&bc_serv->sv_cb_lock); | |
1131 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1132 | spin_unlock(&bc_serv->sv_cb_lock); | |
1133 | wake_up(&bc_serv->sv_cb_waitq); | |
1134 | } | |
1135 | ||
1136 | req->rq_private_buf.len = transport->tcp_copied; | |
1137 | ||
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1142 | struct xdr_skb_reader *desc) | |
1143 | { | |
1144 | struct sock_xprt *transport = | |
1145 | container_of(xprt, struct sock_xprt, xprt); | |
1146 | ||
1147 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1148 | xs_tcp_read_reply(xprt, desc) : | |
1149 | xs_tcp_read_callback(xprt, desc); | |
1150 | } | |
1151 | #else | |
1152 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1153 | struct xdr_skb_reader *desc) | |
1154 | { | |
1155 | return xs_tcp_read_reply(xprt, desc); | |
1156 | } | |
1157 | #endif /* CONFIG_NFS_V4_1 */ | |
1158 | ||
1159 | /* | |
1160 | * Read data off the transport. This can be either an RPC_CALL or an | |
1161 | * RPC_REPLY. Relay the processing to helper functions. | |
1162 | */ | |
1163 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1164 | struct xdr_skb_reader *desc) | |
1165 | { | |
1166 | struct sock_xprt *transport = | |
1167 | container_of(xprt, struct sock_xprt, xprt); | |
1168 | ||
1169 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1170 | xs_tcp_check_fraghdr(transport); | |
1171 | else { | |
1172 | /* | |
1173 | * The transport_lock protects the request handling. | |
1174 | * There's no need to hold it to update the tcp_flags. | |
1175 | */ | |
1176 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1177 | } | |
a246b010 CL |
1178 | } |
1179 | ||
dd456471 | 1180 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1181 | { |
1182 | size_t len; | |
1183 | ||
51971139 | 1184 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1185 | if (len > desc->count) |
1186 | len = desc->count; | |
1187 | desc->count -= len; | |
1188 | desc->offset += len; | |
51971139 | 1189 | transport->tcp_offset += len; |
46121cf7 | 1190 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1191 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1192 | } |
1193 | ||
9903cd1c | 1194 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1195 | { |
1196 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1197 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1198 | struct xdr_skb_reader desc = { |
a246b010 CL |
1199 | .skb = skb, |
1200 | .offset = offset, | |
1201 | .count = len, | |
9903cd1c | 1202 | }; |
a246b010 | 1203 | |
46121cf7 | 1204 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1205 | do { |
1206 | /* Read in a new fragment marker if necessary */ | |
1207 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1208 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1209 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1210 | continue; |
1211 | } | |
1212 | /* Read in the xid if necessary */ | |
e136d092 | 1213 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1214 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1215 | continue; |
1216 | } | |
18dca02a | 1217 | /* Read in the call/reply flag */ |
f4a2e418 | 1218 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1219 | xs_tcp_read_calldir(transport, &desc); |
1220 | continue; | |
1221 | } | |
a246b010 | 1222 | /* Read in the request data */ |
e136d092 | 1223 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1224 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1225 | continue; |
1226 | } | |
1227 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1228 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1229 | } while (desc.count); |
46121cf7 | 1230 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1231 | return len - desc.count; |
1232 | } | |
1233 | ||
9903cd1c CL |
1234 | /** |
1235 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1236 | * @sk: socket with data to read | |
1237 | * @bytes: how much data to read | |
1238 | * | |
1239 | */ | |
1240 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1241 | { |
1242 | struct rpc_xprt *xprt; | |
1243 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1244 | int read; |
a246b010 | 1245 | |
46121cf7 CL |
1246 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1247 | ||
a246b010 | 1248 | read_lock(&sk->sk_callback_lock); |
9903cd1c | 1249 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1250 | goto out; |
a246b010 CL |
1251 | if (xprt->shutdown) |
1252 | goto out; | |
1253 | ||
61d0a8e6 NB |
1254 | /* Any data means we had a useful conversation, so |
1255 | * the we don't need to delay the next reconnect | |
1256 | */ | |
1257 | if (xprt->reestablish_timeout) | |
1258 | xprt->reestablish_timeout = 0; | |
1259 | ||
9903cd1c | 1260 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1261 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1262 | do { |
1263 | rd_desc.count = 65536; | |
1264 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1265 | } while (read > 0); | |
a246b010 CL |
1266 | out: |
1267 | read_unlock(&sk->sk_callback_lock); | |
1268 | } | |
1269 | ||
7d1e8255 TM |
1270 | /* |
1271 | * Do the equivalent of linger/linger2 handling for dealing with | |
1272 | * broken servers that don't close the socket in a timely | |
1273 | * fashion | |
1274 | */ | |
1275 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1276 | unsigned long timeout) | |
1277 | { | |
1278 | struct sock_xprt *transport; | |
1279 | ||
1280 | if (xprt_test_and_set_connecting(xprt)) | |
1281 | return; | |
1282 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1283 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1284 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1285 | timeout); | |
1286 | } | |
1287 | ||
1288 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1289 | { | |
1290 | struct sock_xprt *transport; | |
1291 | ||
1292 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1293 | ||
1294 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1295 | !cancel_delayed_work(&transport->connect_worker)) | |
1296 | return; | |
1297 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1298 | xprt_clear_connecting(xprt); | |
1299 | } | |
1300 | ||
1301 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1302 | { | |
1303 | smp_mb__before_clear_bit(); | |
1304 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1305 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1306 | smp_mb__after_clear_bit(); | |
1307 | /* Mark transport as closed and wake up all pending tasks */ | |
1308 | xprt_disconnect_done(xprt); | |
1309 | } | |
1310 | ||
9903cd1c CL |
1311 | /** |
1312 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1313 | * @sk: socket whose state has changed | |
1314 | * | |
1315 | */ | |
1316 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1317 | { |
9903cd1c | 1318 | struct rpc_xprt *xprt; |
a246b010 CL |
1319 | |
1320 | read_lock(&sk->sk_callback_lock); | |
1321 | if (!(xprt = xprt_from_sock(sk))) | |
1322 | goto out; | |
46121cf7 CL |
1323 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1324 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", | |
1325 | sk->sk_state, xprt_connected(xprt), | |
1326 | sock_flag(sk, SOCK_DEAD), | |
1327 | sock_flag(sk, SOCK_ZAPPED)); | |
a246b010 CL |
1328 | |
1329 | switch (sk->sk_state) { | |
1330 | case TCP_ESTABLISHED: | |
4a0f8c04 | 1331 | spin_lock_bh(&xprt->transport_lock); |
a246b010 | 1332 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1333 | struct sock_xprt *transport = container_of(xprt, |
1334 | struct sock_xprt, xprt); | |
1335 | ||
a246b010 | 1336 | /* Reset TCP record info */ |
51971139 CL |
1337 | transport->tcp_offset = 0; |
1338 | transport->tcp_reclen = 0; | |
1339 | transport->tcp_copied = 0; | |
e136d092 CL |
1340 | transport->tcp_flags = |
1341 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1342 | |
2a491991 | 1343 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1344 | } |
4a0f8c04 | 1345 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 | 1346 | break; |
3b948ae5 TM |
1347 | case TCP_FIN_WAIT1: |
1348 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1349 | xprt->connect_cookie++; |
663b8858 | 1350 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1351 | set_bit(XPRT_CLOSING, &xprt->state); |
1352 | smp_mb__before_clear_bit(); | |
1353 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1354 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1355 | smp_mb__after_clear_bit(); |
25fe6142 | 1356 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1357 | break; |
632e3bdc | 1358 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1359 | /* The server initiated a shutdown of the socket */ |
66af1e55 | 1360 | xprt_force_disconnect(xprt); |
663b8858 | 1361 | case TCP_SYN_SENT: |
7c1d71cf | 1362 | xprt->connect_cookie++; |
663b8858 TM |
1363 | case TCP_CLOSING: |
1364 | /* | |
1365 | * If the server closed down the connection, make sure that | |
1366 | * we back off before reconnecting | |
1367 | */ | |
1368 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1369 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1370 | break; |
1371 | case TCP_LAST_ACK: | |
670f9457 | 1372 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1373 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1374 | smp_mb__before_clear_bit(); |
1375 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1376 | smp_mb__after_clear_bit(); | |
1377 | break; | |
1378 | case TCP_CLOSE: | |
7d1e8255 TM |
1379 | xs_tcp_cancel_linger_timeout(xprt); |
1380 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1381 | } |
1382 | out: | |
1383 | read_unlock(&sk->sk_callback_lock); | |
1384 | } | |
1385 | ||
2a9e1cfa | 1386 | /** |
482f32e6 | 1387 | * xs_error_report - callback mainly for catching socket errors |
2a9e1cfa TM |
1388 | * @sk: socket |
1389 | */ | |
482f32e6 | 1390 | static void xs_error_report(struct sock *sk) |
2a9e1cfa TM |
1391 | { |
1392 | struct rpc_xprt *xprt; | |
1393 | ||
1394 | read_lock(&sk->sk_callback_lock); | |
2a9e1cfa TM |
1395 | if (!(xprt = xprt_from_sock(sk))) |
1396 | goto out; | |
1397 | dprintk("RPC: %s client %p...\n" | |
1398 | "RPC: error %d\n", | |
1399 | __func__, xprt, sk->sk_err); | |
482f32e6 | 1400 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
2a9e1cfa TM |
1401 | out: |
1402 | read_unlock(&sk->sk_callback_lock); | |
1403 | } | |
1404 | ||
1f0fa154 IJ |
1405 | static void xs_write_space(struct sock *sk) |
1406 | { | |
1407 | struct socket *sock; | |
1408 | struct rpc_xprt *xprt; | |
1409 | ||
1410 | if (unlikely(!(sock = sk->sk_socket))) | |
1411 | return; | |
1412 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1413 | ||
1414 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1415 | return; | |
1416 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1417 | return; | |
1418 | ||
1419 | xprt_write_space(xprt); | |
1420 | } | |
1421 | ||
9903cd1c | 1422 | /** |
c7b2cae8 CL |
1423 | * xs_udp_write_space - callback invoked when socket buffer space |
1424 | * becomes available | |
9903cd1c CL |
1425 | * @sk: socket whose state has changed |
1426 | * | |
a246b010 CL |
1427 | * Called when more output buffer space is available for this socket. |
1428 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1429 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1430 | * with a bunch of small requests. |
1431 | */ | |
c7b2cae8 | 1432 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1433 | { |
a246b010 | 1434 | read_lock(&sk->sk_callback_lock); |
a246b010 | 1435 | |
c7b2cae8 | 1436 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1437 | if (sock_writeable(sk)) |
1438 | xs_write_space(sk); | |
a246b010 | 1439 | |
c7b2cae8 CL |
1440 | read_unlock(&sk->sk_callback_lock); |
1441 | } | |
a246b010 | 1442 | |
c7b2cae8 CL |
1443 | /** |
1444 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1445 | * becomes available | |
1446 | * @sk: socket whose state has changed | |
1447 | * | |
1448 | * Called when more output buffer space is available for this socket. | |
1449 | * We try not to wake our writers until they can make "significant" | |
1450 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1451 | * with a bunch of small requests. | |
1452 | */ | |
1453 | static void xs_tcp_write_space(struct sock *sk) | |
1454 | { | |
1455 | read_lock(&sk->sk_callback_lock); | |
1456 | ||
1457 | /* from net/core/stream.c:sk_stream_write_space */ | |
1f0fa154 IJ |
1458 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1459 | xs_write_space(sk); | |
b6ddf64f | 1460 | |
a246b010 CL |
1461 | read_unlock(&sk->sk_callback_lock); |
1462 | } | |
1463 | ||
470056c2 | 1464 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1465 | { |
ee0ac0c2 CL |
1466 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1467 | struct sock *sk = transport->inet; | |
a246b010 | 1468 | |
7c6e066e | 1469 | if (transport->rcvsize) { |
a246b010 | 1470 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1471 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1472 | } |
7c6e066e | 1473 | if (transport->sndsize) { |
a246b010 | 1474 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1475 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1476 | sk->sk_write_space(sk); |
1477 | } | |
1478 | } | |
1479 | ||
43118c29 | 1480 | /** |
470056c2 | 1481 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1482 | * @xprt: generic transport |
470056c2 CL |
1483 | * @sndsize: requested size of send buffer, in bytes |
1484 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1485 | * |
470056c2 | 1486 | * Set socket send and receive buffer size limits. |
43118c29 | 1487 | */ |
470056c2 | 1488 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1489 | { |
7c6e066e CL |
1490 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1491 | ||
1492 | transport->sndsize = 0; | |
470056c2 | 1493 | if (sndsize) |
7c6e066e CL |
1494 | transport->sndsize = sndsize + 1024; |
1495 | transport->rcvsize = 0; | |
470056c2 | 1496 | if (rcvsize) |
7c6e066e | 1497 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1498 | |
1499 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1500 | } |
1501 | ||
46c0ee8b CL |
1502 | /** |
1503 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1504 | * @task: task that timed out | |
1505 | * | |
1506 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1507 | */ | |
1508 | static void xs_udp_timer(struct rpc_task *task) | |
1509 | { | |
1510 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1511 | } | |
1512 | ||
b85d8806 CL |
1513 | static unsigned short xs_get_random_port(void) |
1514 | { | |
1515 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1516 | unsigned short rand = (unsigned short) net_random() % range; | |
1517 | return rand + xprt_min_resvport; | |
1518 | } | |
1519 | ||
92200412 CL |
1520 | /** |
1521 | * xs_set_port - reset the port number in the remote endpoint address | |
1522 | * @xprt: generic transport | |
1523 | * @port: new port number | |
1524 | * | |
1525 | */ | |
1526 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1527 | { | |
46121cf7 | 1528 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1529 | |
9dc3b095 CL |
1530 | rpc_set_port(xs_addr(xprt), port); |
1531 | xs_update_peer_port(xprt); | |
92200412 CL |
1532 | } |
1533 | ||
67a391d7 TM |
1534 | static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) |
1535 | { | |
fbfffbd5 | 1536 | unsigned short port = transport->srcport; |
67a391d7 TM |
1537 | |
1538 | if (port == 0 && transport->xprt.resvport) | |
1539 | port = xs_get_random_port(); | |
1540 | return port; | |
1541 | } | |
1542 | ||
1543 | static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) | |
1544 | { | |
fbfffbd5 CL |
1545 | if (transport->srcport != 0) |
1546 | transport->srcport = 0; | |
67a391d7 TM |
1547 | if (!transport->xprt.resvport) |
1548 | return 0; | |
1549 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1550 | return xprt_max_resvport; | |
1551 | return --port; | |
1552 | } | |
1553 | ||
7dc753f0 | 1554 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
a246b010 CL |
1555 | { |
1556 | struct sockaddr_in myaddr = { | |
1557 | .sin_family = AF_INET, | |
1558 | }; | |
d3bc9a1d | 1559 | struct sockaddr_in *sa; |
67a391d7 TM |
1560 | int err, nloop = 0; |
1561 | unsigned short port = xs_get_srcport(transport, sock); | |
1562 | unsigned short last; | |
a246b010 | 1563 | |
fbfffbd5 | 1564 | sa = (struct sockaddr_in *)&transport->srcaddr; |
d3bc9a1d | 1565 | myaddr.sin_addr = sa->sin_addr; |
a246b010 CL |
1566 | do { |
1567 | myaddr.sin_port = htons(port); | |
e6242e92 | 1568 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 | 1569 | sizeof(myaddr)); |
67a391d7 | 1570 | if (port == 0) |
d3bc9a1d | 1571 | break; |
a246b010 | 1572 | if (err == 0) { |
fbfffbd5 | 1573 | transport->srcport = port; |
d3bc9a1d | 1574 | break; |
a246b010 | 1575 | } |
67a391d7 TM |
1576 | last = port; |
1577 | port = xs_next_srcport(transport, sock, port); | |
1578 | if (port > last) | |
1579 | nloop++; | |
1580 | } while (err == -EADDRINUSE && nloop != 2); | |
21454aaa HH |
1581 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", |
1582 | __func__, &myaddr.sin_addr, | |
7dc753f0 | 1583 | port, err ? "failed" : "ok", err); |
a246b010 CL |
1584 | return err; |
1585 | } | |
1586 | ||
90058d37 CL |
1587 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1588 | { | |
1589 | struct sockaddr_in6 myaddr = { | |
1590 | .sin6_family = AF_INET6, | |
1591 | }; | |
1592 | struct sockaddr_in6 *sa; | |
67a391d7 TM |
1593 | int err, nloop = 0; |
1594 | unsigned short port = xs_get_srcport(transport, sock); | |
1595 | unsigned short last; | |
90058d37 | 1596 | |
fbfffbd5 | 1597 | sa = (struct sockaddr_in6 *)&transport->srcaddr; |
90058d37 CL |
1598 | myaddr.sin6_addr = sa->sin6_addr; |
1599 | do { | |
1600 | myaddr.sin6_port = htons(port); | |
1601 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, | |
1602 | sizeof(myaddr)); | |
67a391d7 | 1603 | if (port == 0) |
90058d37 CL |
1604 | break; |
1605 | if (err == 0) { | |
fbfffbd5 | 1606 | transport->srcport = port; |
90058d37 CL |
1607 | break; |
1608 | } | |
67a391d7 TM |
1609 | last = port; |
1610 | port = xs_next_srcport(transport, sock, port); | |
1611 | if (port > last) | |
1612 | nloop++; | |
1613 | } while (err == -EADDRINUSE && nloop != 2); | |
5b095d98 | 1614 | dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", |
fdb46ee7 | 1615 | &myaddr.sin6_addr, port, err ? "failed" : "ok", err); |
a246b010 CL |
1616 | return err; |
1617 | } | |
1618 | ||
ed07536e PZ |
1619 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1620 | static struct lock_class_key xs_key[2]; | |
1621 | static struct lock_class_key xs_slock_key[2]; | |
1622 | ||
8945ee5e | 1623 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1624 | { |
1625 | struct sock *sk = sock->sk; | |
8945ee5e | 1626 | |
02b3d346 | 1627 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1628 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1629 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1630 | } | |
ed07536e | 1631 | |
8945ee5e CL |
1632 | static inline void xs_reclassify_socket6(struct socket *sock) |
1633 | { | |
1634 | struct sock *sk = sock->sk; | |
ed07536e | 1635 | |
f4921aff | 1636 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1637 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1638 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e PZ |
1639 | } |
1640 | #else | |
8945ee5e CL |
1641 | static inline void xs_reclassify_socket4(struct socket *sock) |
1642 | { | |
1643 | } | |
1644 | ||
1645 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1646 | { |
1647 | } | |
1648 | #endif | |
1649 | ||
16be2d20 CL |
1650 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1651 | { | |
1652 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1653 | ||
1654 | if (!transport->inet) { | |
1655 | struct sock *sk = sock->sk; | |
1656 | ||
1657 | write_lock_bh(&sk->sk_callback_lock); | |
1658 | ||
2a9e1cfa TM |
1659 | xs_save_old_callbacks(transport, sk); |
1660 | ||
16be2d20 | 1661 | sk->sk_user_data = xprt; |
16be2d20 CL |
1662 | sk->sk_data_ready = xs_udp_data_ready; |
1663 | sk->sk_write_space = xs_udp_write_space; | |
482f32e6 | 1664 | sk->sk_error_report = xs_error_report; |
16be2d20 CL |
1665 | sk->sk_no_check = UDP_CSUM_NORCV; |
1666 | sk->sk_allocation = GFP_ATOMIC; | |
1667 | ||
1668 | xprt_set_connected(xprt); | |
1669 | ||
1670 | /* Reset to new socket */ | |
1671 | transport->sock = sock; | |
1672 | transport->inet = sk; | |
1673 | ||
1674 | write_unlock_bh(&sk->sk_callback_lock); | |
1675 | } | |
1676 | xs_udp_do_set_buffer_size(xprt); | |
1677 | } | |
1678 | ||
b0d93ad5 | 1679 | /** |
9c3d72de | 1680 | * xs_udp_connect_worker4 - set up a UDP socket |
65f27f38 | 1681 | * @work: RPC transport to connect |
b0d93ad5 CL |
1682 | * |
1683 | * Invoked by a work queue tasklet. | |
1684 | */ | |
9c3d72de | 1685 | static void xs_udp_connect_worker4(struct work_struct *work) |
a246b010 | 1686 | { |
34161db6 TM |
1687 | struct sock_xprt *transport = |
1688 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1689 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1690 | struct socket *sock = transport->sock; |
b0d93ad5 | 1691 | int err, status = -EIO; |
9903cd1c | 1692 | |
01d37c42 | 1693 | if (xprt->shutdown) |
b0d93ad5 | 1694 | goto out; |
9903cd1c | 1695 | |
b0d93ad5 | 1696 | /* Start by resetting any existing state */ |
fe315e76 | 1697 | xs_reset_transport(transport); |
9903cd1c | 1698 | |
fe315e76 CL |
1699 | err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1700 | if (err < 0) { | |
46121cf7 | 1701 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
b0d93ad5 CL |
1702 | goto out; |
1703 | } | |
8945ee5e | 1704 | xs_reclassify_socket4(sock); |
9903cd1c | 1705 | |
7dc753f0 | 1706 | if (xs_bind4(transport, sock)) { |
b0d93ad5 CL |
1707 | sock_release(sock); |
1708 | goto out; | |
1709 | } | |
9903cd1c | 1710 | |
c740eff8 CL |
1711 | dprintk("RPC: worker connecting xprt %p via %s to " |
1712 | "%s (port %s)\n", xprt, | |
1713 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1714 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1715 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 1716 | |
16be2d20 | 1717 | xs_udp_finish_connecting(xprt, sock); |
b0d93ad5 CL |
1718 | status = 0; |
1719 | out: | |
b0d93ad5 | 1720 | xprt_clear_connecting(xprt); |
7d1e8255 | 1721 | xprt_wake_pending_tasks(xprt, status); |
a246b010 | 1722 | } |
a246b010 | 1723 | |
68e220bd CL |
1724 | /** |
1725 | * xs_udp_connect_worker6 - set up a UDP socket | |
1726 | * @work: RPC transport to connect | |
1727 | * | |
1728 | * Invoked by a work queue tasklet. | |
1729 | */ | |
1730 | static void xs_udp_connect_worker6(struct work_struct *work) | |
1731 | { | |
1732 | struct sock_xprt *transport = | |
1733 | container_of(work, struct sock_xprt, connect_worker.work); | |
1734 | struct rpc_xprt *xprt = &transport->xprt; | |
1735 | struct socket *sock = transport->sock; | |
1736 | int err, status = -EIO; | |
a246b010 | 1737 | |
01d37c42 | 1738 | if (xprt->shutdown) |
68e220bd | 1739 | goto out; |
b0d93ad5 | 1740 | |
68e220bd | 1741 | /* Start by resetting any existing state */ |
fe315e76 | 1742 | xs_reset_transport(transport); |
a246b010 | 1743 | |
fe315e76 CL |
1744 | err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1745 | if (err < 0) { | |
68e220bd CL |
1746 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1747 | goto out; | |
1748 | } | |
8945ee5e | 1749 | xs_reclassify_socket6(sock); |
a246b010 | 1750 | |
68e220bd CL |
1751 | if (xs_bind6(transport, sock) < 0) { |
1752 | sock_release(sock); | |
1753 | goto out; | |
b0d93ad5 | 1754 | } |
68e220bd | 1755 | |
c740eff8 CL |
1756 | dprintk("RPC: worker connecting xprt %p via %s to " |
1757 | "%s (port %s)\n", xprt, | |
1758 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1759 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1760 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
1761 | |
1762 | xs_udp_finish_connecting(xprt, sock); | |
b0d93ad5 CL |
1763 | status = 0; |
1764 | out: | |
b0d93ad5 | 1765 | xprt_clear_connecting(xprt); |
7d1e8255 | 1766 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
1767 | } |
1768 | ||
3167e12c CL |
1769 | /* |
1770 | * We need to preserve the port number so the reply cache on the server can | |
1771 | * find our cached RPC replies when we get around to reconnecting. | |
1772 | */ | |
40d2549d | 1773 | static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
3167e12c CL |
1774 | { |
1775 | int result; | |
3167e12c CL |
1776 | struct sockaddr any; |
1777 | ||
46121cf7 | 1778 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
3167e12c CL |
1779 | |
1780 | /* | |
1781 | * Disconnect the transport socket by doing a connect operation | |
1782 | * with AF_UNSPEC. This should return immediately... | |
1783 | */ | |
1784 | memset(&any, 0, sizeof(any)); | |
1785 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1786 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
7d1e8255 TM |
1787 | if (!result) |
1788 | xs_sock_mark_closed(xprt); | |
1789 | else | |
46121cf7 | 1790 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
1791 | result); |
1792 | } | |
1793 | ||
40d2549d TM |
1794 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1795 | { | |
1796 | unsigned int state = transport->inet->sk_state; | |
1797 | ||
1798 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) | |
1799 | return; | |
1800 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) | |
1801 | return; | |
1802 | xs_abort_connection(xprt, transport); | |
1803 | } | |
1804 | ||
16be2d20 | 1805 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 1806 | { |
16be2d20 | 1807 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
edb267a6 | 1808 | |
ee0ac0c2 | 1809 | if (!transport->inet) { |
b0d93ad5 CL |
1810 | struct sock *sk = sock->sk; |
1811 | ||
1812 | write_lock_bh(&sk->sk_callback_lock); | |
1813 | ||
2a9e1cfa TM |
1814 | xs_save_old_callbacks(transport, sk); |
1815 | ||
b0d93ad5 | 1816 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
1817 | sk->sk_data_ready = xs_tcp_data_ready; |
1818 | sk->sk_state_change = xs_tcp_state_change; | |
1819 | sk->sk_write_space = xs_tcp_write_space; | |
482f32e6 | 1820 | sk->sk_error_report = xs_error_report; |
b079fa7b | 1821 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1822 | |
1823 | /* socket options */ | |
1824 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1825 | sock_reset_flag(sk, SOCK_LINGER); | |
1826 | tcp_sk(sk)->linger2 = 0; | |
1827 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1828 | |
1829 | xprt_clear_connected(xprt); | |
1830 | ||
1831 | /* Reset to new socket */ | |
ee0ac0c2 CL |
1832 | transport->sock = sock; |
1833 | transport->inet = sk; | |
b0d93ad5 CL |
1834 | |
1835 | write_unlock_bh(&sk->sk_callback_lock); | |
1836 | } | |
1837 | ||
01d37c42 TM |
1838 | if (!xprt_bound(xprt)) |
1839 | return -ENOTCONN; | |
1840 | ||
b0d93ad5 | 1841 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
1842 | xprt->stat.connect_count++; |
1843 | xprt->stat.connect_start = jiffies; | |
95392c59 | 1844 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
16be2d20 CL |
1845 | } |
1846 | ||
9903cd1c | 1847 | /** |
b61d59ff TM |
1848 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
1849 | * @xprt: RPC transport to connect | |
1850 | * @transport: socket transport to connect | |
1851 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
1852 | * |
1853 | * Invoked by a work queue tasklet. | |
a246b010 | 1854 | */ |
b61d59ff TM |
1855 | static void xs_tcp_setup_socket(struct rpc_xprt *xprt, |
1856 | struct sock_xprt *transport, | |
1857 | struct socket *(*create_sock)(struct rpc_xprt *, | |
1858 | struct sock_xprt *)) | |
a246b010 | 1859 | { |
ee0ac0c2 | 1860 | struct socket *sock = transport->sock; |
b61d59ff | 1861 | int status = -EIO; |
a246b010 | 1862 | |
01d37c42 | 1863 | if (xprt->shutdown) |
a246b010 CL |
1864 | goto out; |
1865 | ||
ee0ac0c2 | 1866 | if (!sock) { |
7d1e8255 | 1867 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
b61d59ff TM |
1868 | sock = create_sock(xprt, transport); |
1869 | if (IS_ERR(sock)) { | |
1870 | status = PTR_ERR(sock); | |
3167e12c CL |
1871 | goto out; |
1872 | } | |
7d1e8255 TM |
1873 | } else { |
1874 | int abort_and_exit; | |
a246b010 | 1875 | |
7d1e8255 TM |
1876 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
1877 | &xprt->state); | |
3167e12c | 1878 | /* "close" the socket, preserving the local port */ |
40d2549d | 1879 | xs_tcp_reuse_connection(xprt, transport); |
a246b010 | 1880 | |
7d1e8255 TM |
1881 | if (abort_and_exit) |
1882 | goto out_eagain; | |
1883 | } | |
a246b010 | 1884 | |
c740eff8 CL |
1885 | dprintk("RPC: worker connecting xprt %p via %s to " |
1886 | "%s (port %s)\n", xprt, | |
1887 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1888 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1889 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 1890 | |
16be2d20 | 1891 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 CL |
1892 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1893 | xprt, -status, xprt_connected(xprt), | |
1894 | sock->sk->sk_state); | |
2a491991 | 1895 | switch (status) { |
f75e6745 TM |
1896 | default: |
1897 | printk("%s: connect returned unhandled error %d\n", | |
1898 | __func__, status); | |
1899 | case -EADDRNOTAVAIL: | |
1900 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
1901 | * and retry | |
1902 | */ | |
1903 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
1904 | xprt_force_disconnect(xprt); | |
88b5ed73 | 1905 | break; |
8a2cec29 TM |
1906 | case -ECONNREFUSED: |
1907 | case -ECONNRESET: | |
1908 | case -ENETUNREACH: | |
1909 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
1910 | case 0: |
1911 | case -EINPROGRESS: | |
1912 | case -EALREADY: | |
7d1e8255 TM |
1913 | xprt_clear_connecting(xprt); |
1914 | return; | |
a246b010 | 1915 | } |
7d1e8255 | 1916 | out_eagain: |
2a491991 | 1917 | status = -EAGAIN; |
a246b010 | 1918 | out: |
68e220bd | 1919 | xprt_clear_connecting(xprt); |
7d1e8255 | 1920 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 1921 | } |
b0d93ad5 | 1922 | |
b61d59ff TM |
1923 | static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, |
1924 | struct sock_xprt *transport) | |
1925 | { | |
1926 | struct socket *sock; | |
1927 | int err; | |
1928 | ||
1929 | /* start from scratch */ | |
1930 | err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1931 | if (err < 0) { | |
1932 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
1933 | -err); | |
1934 | goto out_err; | |
1935 | } | |
1936 | xs_reclassify_socket4(sock); | |
1937 | ||
1938 | if (xs_bind4(transport, sock) < 0) { | |
1939 | sock_release(sock); | |
1940 | goto out_err; | |
1941 | } | |
1942 | return sock; | |
1943 | out_err: | |
1944 | return ERR_PTR(-EIO); | |
68e220bd | 1945 | } |
b0d93ad5 | 1946 | |
68e220bd | 1947 | /** |
b61d59ff | 1948 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
68e220bd CL |
1949 | * @work: RPC transport to connect |
1950 | * | |
1951 | * Invoked by a work queue tasklet. | |
1952 | */ | |
b61d59ff | 1953 | static void xs_tcp_connect_worker4(struct work_struct *work) |
68e220bd CL |
1954 | { |
1955 | struct sock_xprt *transport = | |
1956 | container_of(work, struct sock_xprt, connect_worker.work); | |
1957 | struct rpc_xprt *xprt = &transport->xprt; | |
3167e12c | 1958 | |
b61d59ff TM |
1959 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); |
1960 | } | |
b0d93ad5 | 1961 | |
b61d59ff TM |
1962 | static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, |
1963 | struct sock_xprt *transport) | |
1964 | { | |
1965 | struct socket *sock; | |
1966 | int err; | |
7d1e8255 | 1967 | |
b61d59ff TM |
1968 | /* start from scratch */ |
1969 | err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1970 | if (err < 0) { | |
1971 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
1972 | -err); | |
1973 | goto out_err; | |
1974 | } | |
1975 | xs_reclassify_socket6(sock); | |
b0d93ad5 | 1976 | |
b61d59ff TM |
1977 | if (xs_bind6(transport, sock) < 0) { |
1978 | sock_release(sock); | |
1979 | goto out_err; | |
7d1e8255 | 1980 | } |
b61d59ff TM |
1981 | return sock; |
1982 | out_err: | |
1983 | return ERR_PTR(-EIO); | |
1984 | } | |
b0d93ad5 | 1985 | |
b61d59ff TM |
1986 | /** |
1987 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint | |
1988 | * @work: RPC transport to connect | |
1989 | * | |
1990 | * Invoked by a work queue tasklet. | |
1991 | */ | |
1992 | static void xs_tcp_connect_worker6(struct work_struct *work) | |
1993 | { | |
1994 | struct sock_xprt *transport = | |
1995 | container_of(work, struct sock_xprt, connect_worker.work); | |
1996 | struct rpc_xprt *xprt = &transport->xprt; | |
b0d93ad5 | 1997 | |
b61d59ff | 1998 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); |
a246b010 CL |
1999 | } |
2000 | ||
9903cd1c CL |
2001 | /** |
2002 | * xs_connect - connect a socket to a remote endpoint | |
2003 | * @task: address of RPC task that manages state of connect request | |
2004 | * | |
2005 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2006 | * |
2007 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2008 | * to guarantee that even unprivileged user processes can set up a | |
2009 | * socket on a privileged port. | |
2010 | * | |
2011 | * If a UDP socket connect fails, the delay behavior here prevents | |
2012 | * retry floods (hard mounts). | |
9903cd1c CL |
2013 | */ |
2014 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
2015 | { |
2016 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 2017 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2018 | |
b0d93ad5 CL |
2019 | if (xprt_test_and_set_connecting(xprt)) |
2020 | return; | |
2021 | ||
09a21c41 | 2022 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
46121cf7 CL |
2023 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2024 | "seconds\n", | |
03bf4b70 | 2025 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2026 | queue_delayed_work(rpciod_workqueue, |
2027 | &transport->connect_worker, | |
2028 | xprt->reestablish_timeout); | |
03bf4b70 | 2029 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2030 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2031 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2032 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2033 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2034 | } else { |
46121cf7 | 2035 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2036 | queue_delayed_work(rpciod_workqueue, |
2037 | &transport->connect_worker, 0); | |
a246b010 CL |
2038 | } |
2039 | } | |
2040 | ||
e06799f9 TM |
2041 | static void xs_tcp_connect(struct rpc_task *task) |
2042 | { | |
2043 | struct rpc_xprt *xprt = task->tk_xprt; | |
2044 | ||
e06799f9 TM |
2045 | /* Exit if we need to wait for socket shutdown to complete */ |
2046 | if (test_bit(XPRT_CLOSING, &xprt->state)) | |
2047 | return; | |
2048 | xs_connect(task); | |
2049 | } | |
2050 | ||
262ca07d CL |
2051 | /** |
2052 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2053 | * @xprt: rpc_xprt struct containing statistics | |
2054 | * @seq: output file | |
2055 | * | |
2056 | */ | |
2057 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2058 | { | |
c8475461 CL |
2059 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2060 | ||
262ca07d | 2061 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
fbfffbd5 | 2062 | transport->srcport, |
262ca07d CL |
2063 | xprt->stat.bind_count, |
2064 | xprt->stat.sends, | |
2065 | xprt->stat.recvs, | |
2066 | xprt->stat.bad_xids, | |
2067 | xprt->stat.req_u, | |
2068 | xprt->stat.bklog_u); | |
2069 | } | |
2070 | ||
2071 | /** | |
2072 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2073 | * @xprt: rpc_xprt struct containing statistics | |
2074 | * @seq: output file | |
2075 | * | |
2076 | */ | |
2077 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2078 | { | |
c8475461 | 2079 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2080 | long idle_time = 0; |
2081 | ||
2082 | if (xprt_connected(xprt)) | |
2083 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2084 | ||
2085 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
fbfffbd5 | 2086 | transport->srcport, |
262ca07d CL |
2087 | xprt->stat.bind_count, |
2088 | xprt->stat.connect_count, | |
2089 | xprt->stat.connect_time, | |
2090 | idle_time, | |
2091 | xprt->stat.sends, | |
2092 | xprt->stat.recvs, | |
2093 | xprt->stat.bad_xids, | |
2094 | xprt->stat.req_u, | |
2095 | xprt->stat.bklog_u); | |
2096 | } | |
2097 | ||
4cfc7e60 RI |
2098 | /* |
2099 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2100 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2101 | * to use the server side send routines. | |
2102 | */ | |
2103 | void *bc_malloc(struct rpc_task *task, size_t size) | |
2104 | { | |
2105 | struct page *page; | |
2106 | struct rpc_buffer *buf; | |
2107 | ||
2108 | BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); | |
2109 | page = alloc_page(GFP_KERNEL); | |
2110 | ||
2111 | if (!page) | |
2112 | return NULL; | |
2113 | ||
2114 | buf = page_address(page); | |
2115 | buf->len = PAGE_SIZE; | |
2116 | ||
2117 | return buf->data; | |
2118 | } | |
2119 | ||
2120 | /* | |
2121 | * Free the space allocated in the bc_alloc routine | |
2122 | */ | |
2123 | void bc_free(void *buffer) | |
2124 | { | |
2125 | struct rpc_buffer *buf; | |
2126 | ||
2127 | if (!buffer) | |
2128 | return; | |
2129 | ||
2130 | buf = container_of(buffer, struct rpc_buffer, data); | |
2131 | free_page((unsigned long)buf); | |
2132 | } | |
2133 | ||
2134 | /* | |
2135 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2136 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2137 | */ | |
2138 | static int bc_sendto(struct rpc_rqst *req) | |
2139 | { | |
2140 | int len; | |
2141 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2142 | struct rpc_xprt *xprt = req->rq_xprt; | |
2143 | struct sock_xprt *transport = | |
2144 | container_of(xprt, struct sock_xprt, xprt); | |
2145 | struct socket *sock = transport->sock; | |
2146 | unsigned long headoff; | |
2147 | unsigned long tailoff; | |
2148 | ||
2149 | /* | |
2150 | * Set up the rpc header and record marker stuff | |
2151 | */ | |
2152 | xs_encode_tcp_record_marker(xbufp); | |
2153 | ||
2154 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2155 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2156 | len = svc_send_common(sock, xbufp, | |
2157 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2158 | xbufp->tail[0].iov_base, tailoff); | |
2159 | ||
2160 | if (len != xbufp->len) { | |
2161 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2162 | len = -EAGAIN; | |
2163 | } | |
2164 | ||
2165 | return len; | |
2166 | } | |
2167 | ||
2168 | /* | |
2169 | * The send routine. Borrows from svc_send | |
2170 | */ | |
2171 | static int bc_send_request(struct rpc_task *task) | |
2172 | { | |
2173 | struct rpc_rqst *req = task->tk_rqstp; | |
2174 | struct svc_xprt *xprt; | |
2175 | struct svc_sock *svsk; | |
2176 | u32 len; | |
2177 | ||
2178 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2179 | /* | |
2180 | * Get the server socket associated with this callback xprt | |
2181 | */ | |
2182 | xprt = req->rq_xprt->bc_xprt; | |
2183 | svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
2184 | ||
2185 | /* | |
2186 | * Grab the mutex to serialize data as the connection is shared | |
2187 | * with the fore channel | |
2188 | */ | |
2189 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2190 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2191 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2192 | return -EAGAIN; | |
2193 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2194 | } | |
2195 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2196 | len = -ENOTCONN; | |
2197 | else | |
2198 | len = bc_sendto(req); | |
2199 | mutex_unlock(&xprt->xpt_mutex); | |
2200 | ||
2201 | if (len > 0) | |
2202 | len = 0; | |
2203 | ||
2204 | return len; | |
2205 | } | |
2206 | ||
2207 | /* | |
2208 | * The close routine. Since this is client initiated, we do nothing | |
2209 | */ | |
2210 | ||
2211 | static void bc_close(struct rpc_xprt *xprt) | |
2212 | { | |
2213 | return; | |
2214 | } | |
2215 | ||
2216 | /* | |
2217 | * The xprt destroy routine. Again, because this connection is client | |
2218 | * initiated, we do nothing | |
2219 | */ | |
2220 | ||
2221 | static void bc_destroy(struct rpc_xprt *xprt) | |
2222 | { | |
2223 | return; | |
2224 | } | |
2225 | ||
262965f5 | 2226 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2227 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2228 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2229 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 2230 | .rpcbind = rpcb_getport_async, |
92200412 | 2231 | .set_port = xs_set_port, |
262965f5 | 2232 | .connect = xs_connect, |
02107148 CL |
2233 | .buf_alloc = rpc_malloc, |
2234 | .buf_free = rpc_free, | |
262965f5 | 2235 | .send_request = xs_udp_send_request, |
fe3aca29 | 2236 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2237 | .timer = xs_udp_timer, |
a58dd398 | 2238 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2239 | .close = xs_close, |
2240 | .destroy = xs_destroy, | |
262ca07d | 2241 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2242 | }; |
2243 | ||
2244 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2245 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2246 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 2247 | .rpcbind = rpcb_getport_async, |
92200412 | 2248 | .set_port = xs_set_port, |
e06799f9 | 2249 | .connect = xs_tcp_connect, |
02107148 CL |
2250 | .buf_alloc = rpc_malloc, |
2251 | .buf_free = rpc_free, | |
262965f5 | 2252 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2253 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
0d90ba1c RL |
2254 | #if defined(CONFIG_NFS_V4_1) |
2255 | .release_request = bc_release_request, | |
2256 | #endif /* CONFIG_NFS_V4_1 */ | |
f75e6745 | 2257 | .close = xs_tcp_close, |
9903cd1c | 2258 | .destroy = xs_destroy, |
262ca07d | 2259 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2260 | }; |
2261 | ||
4cfc7e60 RI |
2262 | /* |
2263 | * The rpc_xprt_ops for the server backchannel | |
2264 | */ | |
2265 | ||
2266 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2267 | .reserve_xprt = xprt_reserve_xprt, | |
2268 | .release_xprt = xprt_release_xprt, | |
2269 | .buf_alloc = bc_malloc, | |
2270 | .buf_free = bc_free, | |
2271 | .send_request = bc_send_request, | |
2272 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2273 | .close = bc_close, | |
2274 | .destroy = bc_destroy, | |
2275 | .print_stats = xs_tcp_print_stats, | |
2276 | }; | |
2277 | ||
3c341b0b | 2278 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
bc25571e | 2279 | unsigned int slot_table_size) |
c8541ecd CL |
2280 | { |
2281 | struct rpc_xprt *xprt; | |
ffc2e518 | 2282 | struct sock_xprt *new; |
c8541ecd | 2283 | |
96802a09 | 2284 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2285 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2286 | return ERR_PTR(-EBADF); |
2287 | } | |
2288 | ||
ffc2e518 CL |
2289 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
2290 | if (new == NULL) { | |
46121cf7 CL |
2291 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2292 | "rpc_xprt\n"); | |
c8541ecd CL |
2293 | return ERR_PTR(-ENOMEM); |
2294 | } | |
ffc2e518 | 2295 | xprt = &new->xprt; |
c8541ecd CL |
2296 | |
2297 | xprt->max_reqs = slot_table_size; | |
2298 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); | |
2299 | if (xprt->slot == NULL) { | |
2300 | kfree(xprt); | |
46121cf7 CL |
2301 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
2302 | "table\n"); | |
c8541ecd CL |
2303 | return ERR_PTR(-ENOMEM); |
2304 | } | |
2305 | ||
96802a09 FM |
2306 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2307 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2308 | if (args->srcaddr) |
fbfffbd5 | 2309 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
c8541ecd CL |
2310 | |
2311 | return xprt; | |
2312 | } | |
2313 | ||
2881ae74 TM |
2314 | static const struct rpc_timeout xs_udp_default_timeout = { |
2315 | .to_initval = 5 * HZ, | |
2316 | .to_maxval = 30 * HZ, | |
2317 | .to_increment = 5 * HZ, | |
2318 | .to_retries = 5, | |
2319 | }; | |
2320 | ||
9903cd1c CL |
2321 | /** |
2322 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2323 | * @args: rpc transport creation arguments |
9903cd1c CL |
2324 | * |
2325 | */ | |
483066d6 | 2326 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2327 | { |
8f9d5b1a | 2328 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2329 | struct rpc_xprt *xprt; |
c8475461 | 2330 | struct sock_xprt *transport; |
a246b010 | 2331 | |
96802a09 | 2332 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
2333 | if (IS_ERR(xprt)) |
2334 | return xprt; | |
c8475461 | 2335 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2336 | |
ec739ef0 | 2337 | xprt->prot = IPPROTO_UDP; |
808012fb | 2338 | xprt->tsh_size = 0; |
a246b010 CL |
2339 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2340 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2341 | ||
03bf4b70 CL |
2342 | xprt->bind_timeout = XS_BIND_TO; |
2343 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
2344 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
2345 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2346 | |
262965f5 | 2347 | xprt->ops = &xs_udp_ops; |
a246b010 | 2348 | |
ba7392bb | 2349 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2350 | |
8f9d5b1a CL |
2351 | switch (addr->sa_family) { |
2352 | case AF_INET: | |
2353 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2354 | xprt_set_bound(xprt); | |
2355 | ||
2356 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2357 | xs_udp_connect_worker4); | |
9dc3b095 | 2358 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2359 | break; |
2360 | case AF_INET6: | |
2361 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2362 | xprt_set_bound(xprt); | |
2363 | ||
2364 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2365 | xs_udp_connect_worker6); | |
9dc3b095 | 2366 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2367 | break; |
2368 | default: | |
2369 | kfree(xprt); | |
2370 | return ERR_PTR(-EAFNOSUPPORT); | |
2371 | } | |
2372 | ||
c740eff8 CL |
2373 | if (xprt_bound(xprt)) |
2374 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2375 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2376 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2377 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2378 | else | |
2379 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2380 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2381 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2382 | |
bc25571e TT |
2383 | if (try_module_get(THIS_MODULE)) |
2384 | return xprt; | |
2385 | ||
2386 | kfree(xprt->slot); | |
2387 | kfree(xprt); | |
2388 | return ERR_PTR(-EINVAL); | |
a246b010 CL |
2389 | } |
2390 | ||
2881ae74 TM |
2391 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2392 | .to_initval = 60 * HZ, | |
2393 | .to_maxval = 60 * HZ, | |
2394 | .to_retries = 2, | |
2395 | }; | |
2396 | ||
9903cd1c CL |
2397 | /** |
2398 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2399 | * @args: rpc transport creation arguments |
9903cd1c CL |
2400 | * |
2401 | */ | |
483066d6 | 2402 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2403 | { |
8f9d5b1a | 2404 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2405 | struct rpc_xprt *xprt; |
c8475461 | 2406 | struct sock_xprt *transport; |
a246b010 | 2407 | |
96802a09 | 2408 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
2409 | if (IS_ERR(xprt)) |
2410 | return xprt; | |
c8475461 | 2411 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2412 | |
ec739ef0 | 2413 | xprt->prot = IPPROTO_TCP; |
808012fb | 2414 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2415 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2416 | |
03bf4b70 CL |
2417 | xprt->bind_timeout = XS_BIND_TO; |
2418 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
2419 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2420 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2421 | |
262965f5 | 2422 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2423 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2424 | |
8f9d5b1a CL |
2425 | switch (addr->sa_family) { |
2426 | case AF_INET: | |
2427 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2428 | xprt_set_bound(xprt); | |
2429 | ||
9dc3b095 CL |
2430 | INIT_DELAYED_WORK(&transport->connect_worker, |
2431 | xs_tcp_connect_worker4); | |
2432 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); | |
8f9d5b1a CL |
2433 | break; |
2434 | case AF_INET6: | |
2435 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2436 | xprt_set_bound(xprt); | |
2437 | ||
9dc3b095 CL |
2438 | INIT_DELAYED_WORK(&transport->connect_worker, |
2439 | xs_tcp_connect_worker6); | |
2440 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); | |
8f9d5b1a CL |
2441 | break; |
2442 | default: | |
2443 | kfree(xprt); | |
2444 | return ERR_PTR(-EAFNOSUPPORT); | |
2445 | } | |
2446 | ||
c740eff8 CL |
2447 | if (xprt_bound(xprt)) |
2448 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2449 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2450 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2451 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2452 | else | |
2453 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2454 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2455 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2456 | ||
edb267a6 | 2457 | |
bc25571e TT |
2458 | if (try_module_get(THIS_MODULE)) |
2459 | return xprt; | |
2460 | ||
2461 | kfree(xprt->slot); | |
2462 | kfree(xprt); | |
2463 | return ERR_PTR(-EINVAL); | |
a246b010 | 2464 | } |
282b32e1 | 2465 | |
f300baba AB |
2466 | /** |
2467 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2468 | * @args: rpc transport creation arguments | |
2469 | * | |
2470 | */ | |
2471 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2472 | { | |
2473 | struct sockaddr *addr = args->dstaddr; | |
2474 | struct rpc_xprt *xprt; | |
2475 | struct sock_xprt *transport; | |
2476 | struct svc_sock *bc_sock; | |
2477 | ||
2478 | if (!args->bc_xprt) | |
2479 | ERR_PTR(-EINVAL); | |
2480 | ||
2481 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); | |
2482 | if (IS_ERR(xprt)) | |
2483 | return xprt; | |
2484 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2485 | ||
2486 | xprt->prot = IPPROTO_TCP; | |
2487 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2488 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2489 | xprt->timeout = &xs_tcp_default_timeout; | |
2490 | ||
2491 | /* backchannel */ | |
2492 | xprt_set_bound(xprt); | |
2493 | xprt->bind_timeout = 0; | |
2494 | xprt->connect_timeout = 0; | |
2495 | xprt->reestablish_timeout = 0; | |
2496 | xprt->idle_timeout = 0; | |
2497 | ||
2498 | /* | |
2499 | * The backchannel uses the same socket connection as the | |
2500 | * forechannel | |
2501 | */ | |
2502 | xprt->bc_xprt = args->bc_xprt; | |
2503 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
2504 | bc_sock->sk_bc_xprt = xprt; | |
2505 | transport->sock = bc_sock->sk_sock; | |
2506 | transport->inet = bc_sock->sk_sk; | |
2507 | ||
2508 | xprt->ops = &bc_tcp_ops; | |
2509 | ||
2510 | switch (addr->sa_family) { | |
2511 | case AF_INET: | |
2512 | xs_format_peer_addresses(xprt, "tcp", | |
2513 | RPCBIND_NETID_TCP); | |
2514 | break; | |
2515 | case AF_INET6: | |
2516 | xs_format_peer_addresses(xprt, "tcp", | |
2517 | RPCBIND_NETID_TCP6); | |
2518 | break; | |
2519 | default: | |
2520 | kfree(xprt); | |
2521 | return ERR_PTR(-EAFNOSUPPORT); | |
2522 | } | |
2523 | ||
2524 | if (xprt_bound(xprt)) | |
2525 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2526 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2527 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2528 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2529 | else | |
2530 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2531 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2532 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2533 | ||
2534 | /* | |
2535 | * Since we don't want connections for the backchannel, we set | |
2536 | * the xprt status to connected | |
2537 | */ | |
2538 | xprt_set_connected(xprt); | |
2539 | ||
2540 | ||
2541 | if (try_module_get(THIS_MODULE)) | |
2542 | return xprt; | |
2543 | kfree(xprt->slot); | |
2544 | kfree(xprt); | |
2545 | return ERR_PTR(-EINVAL); | |
2546 | } | |
2547 | ||
bc25571e TT |
2548 | static struct xprt_class xs_udp_transport = { |
2549 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2550 | .name = "udp", | |
2551 | .owner = THIS_MODULE, | |
f300baba | 2552 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
2553 | .setup = xs_setup_udp, |
2554 | }; | |
2555 | ||
2556 | static struct xprt_class xs_tcp_transport = { | |
2557 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2558 | .name = "tcp", | |
2559 | .owner = THIS_MODULE, | |
f300baba | 2560 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
2561 | .setup = xs_setup_tcp, |
2562 | }; | |
2563 | ||
f300baba AB |
2564 | static struct xprt_class xs_bc_tcp_transport = { |
2565 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
2566 | .name = "tcp NFSv4.1 backchannel", | |
2567 | .owner = THIS_MODULE, | |
2568 | .ident = XPRT_TRANSPORT_BC_TCP, | |
2569 | .setup = xs_setup_bc_tcp, | |
2570 | }; | |
2571 | ||
282b32e1 | 2572 | /** |
bc25571e | 2573 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2574 | * |
2575 | */ | |
2576 | int init_socket_xprt(void) | |
2577 | { | |
fbf76683 | 2578 | #ifdef RPC_DEBUG |
2b1bec5f | 2579 | if (!sunrpc_table_header) |
0b4d4147 | 2580 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2581 | #endif |
2582 | ||
bc25571e TT |
2583 | xprt_register_transport(&xs_udp_transport); |
2584 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 2585 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 2586 | |
282b32e1 CL |
2587 | return 0; |
2588 | } | |
2589 | ||
2590 | /** | |
bc25571e | 2591 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2592 | * |
2593 | */ | |
2594 | void cleanup_socket_xprt(void) | |
2595 | { | |
fbf76683 CL |
2596 | #ifdef RPC_DEBUG |
2597 | if (sunrpc_table_header) { | |
2598 | unregister_sysctl_table(sunrpc_table_header); | |
2599 | sunrpc_table_header = NULL; | |
2600 | } | |
2601 | #endif | |
bc25571e TT |
2602 | |
2603 | xprt_unregister_transport(&xs_udp_transport); | |
2604 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 2605 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 2606 | } |
cbf11071 TM |
2607 | |
2608 | static int param_set_uint_minmax(const char *val, struct kernel_param *kp, | |
2609 | unsigned int min, unsigned int max) | |
2610 | { | |
2611 | unsigned long num; | |
2612 | int ret; | |
2613 | ||
2614 | if (!val) | |
2615 | return -EINVAL; | |
2616 | ret = strict_strtoul(val, 0, &num); | |
2617 | if (ret == -EINVAL || num < min || num > max) | |
2618 | return -EINVAL; | |
2619 | *((unsigned int *)kp->arg) = num; | |
2620 | return 0; | |
2621 | } | |
2622 | ||
2623 | static int param_set_portnr(const char *val, struct kernel_param *kp) | |
2624 | { | |
2625 | return param_set_uint_minmax(val, kp, | |
2626 | RPC_MIN_RESVPORT, | |
2627 | RPC_MAX_RESVPORT); | |
2628 | } | |
2629 | ||
2630 | static int param_get_portnr(char *buffer, struct kernel_param *kp) | |
2631 | { | |
2632 | return param_get_uint(buffer, kp); | |
2633 | } | |
2634 | #define param_check_portnr(name, p) \ | |
2635 | __param_check(name, p, unsigned int); | |
2636 | ||
2637 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
2638 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
2639 | ||
2640 | static int param_set_slot_table_size(const char *val, struct kernel_param *kp) | |
2641 | { | |
2642 | return param_set_uint_minmax(val, kp, | |
2643 | RPC_MIN_SLOT_TABLE, | |
2644 | RPC_MAX_SLOT_TABLE); | |
2645 | } | |
2646 | ||
2647 | static int param_get_slot_table_size(char *buffer, struct kernel_param *kp) | |
2648 | { | |
2649 | return param_get_uint(buffer, kp); | |
2650 | } | |
2651 | #define param_check_slot_table_size(name, p) \ | |
2652 | __param_check(name, p, unsigned int); | |
2653 | ||
2654 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, | |
2655 | slot_table_size, 0644); | |
2656 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, | |
2657 | slot_table_size, 0644); | |
2658 |