Commit | Line | Data |
---|---|---|
a246b010 CL |
1 | /* |
2 | * linux/net/sunrpc/xprtsock.c | |
3 | * | |
4 | * Client-side transport implementation for sockets. | |
5 | * | |
113aa838 AC |
6 | * TCP callback races fixes (C) 1998 Red Hat |
7 | * TCP send fixes (C) 1998 Red Hat | |
a246b010 CL |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> | |
10 | * | |
11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. | |
12 | * Fix behaviour when socket buffer is full. | |
13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/slab.h> | |
bc25571e | 23 | #include <linux/module.h> |
a246b010 | 24 | #include <linux/capability.h> |
a246b010 CL |
25 | #include <linux/pagemap.h> |
26 | #include <linux/errno.h> | |
27 | #include <linux/socket.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/net.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/udp.h> | |
32 | #include <linux/tcp.h> | |
33 | #include <linux/sunrpc/clnt.h> | |
02107148 | 34 | #include <linux/sunrpc/sched.h> |
49c36fcc | 35 | #include <linux/sunrpc/xprtsock.h> |
a246b010 | 36 | #include <linux/file.h> |
44b98efd RL |
37 | #ifdef CONFIG_NFS_V4_1 |
38 | #include <linux/sunrpc/bc_xprt.h> | |
39 | #endif | |
a246b010 CL |
40 | |
41 | #include <net/sock.h> | |
42 | #include <net/checksum.h> | |
43 | #include <net/udp.h> | |
44 | #include <net/tcp.h> | |
45 | ||
c556b754 CL |
46 | /* |
47 | * xprtsock tunables | |
48 | */ | |
49 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
50 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
51 | ||
52 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
53 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
54 | ||
7d1e8255 | 55 | #define XS_TCP_LINGER_TO (15U * HZ) |
25fe6142 | 56 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
7d1e8255 | 57 | |
fbf76683 CL |
58 | /* |
59 | * We can register our own files under /proc/sys/sunrpc by | |
60 | * calling register_sysctl_table() again. The files in that | |
61 | * directory become the union of all files registered there. | |
62 | * | |
63 | * We simply need to make sure that we don't collide with | |
64 | * someone else's file names! | |
65 | */ | |
66 | ||
67 | #ifdef RPC_DEBUG | |
68 | ||
69 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
70 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
71 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; | |
72 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
73 | ||
74 | static struct ctl_table_header *sunrpc_table_header; | |
75 | ||
76 | /* | |
77 | * FIXME: changing the UDP slot table size should also resize the UDP | |
78 | * socket buffers for existing UDP transports | |
79 | */ | |
80 | static ctl_table xs_tunables_table[] = { | |
81 | { | |
82 | .ctl_name = CTL_SLOTTABLE_UDP, | |
83 | .procname = "udp_slot_table_entries", | |
84 | .data = &xprt_udp_slot_table_entries, | |
85 | .maxlen = sizeof(unsigned int), | |
86 | .mode = 0644, | |
87 | .proc_handler = &proc_dointvec_minmax, | |
88 | .strategy = &sysctl_intvec, | |
89 | .extra1 = &min_slot_table_size, | |
90 | .extra2 = &max_slot_table_size | |
91 | }, | |
92 | { | |
93 | .ctl_name = CTL_SLOTTABLE_TCP, | |
94 | .procname = "tcp_slot_table_entries", | |
95 | .data = &xprt_tcp_slot_table_entries, | |
96 | .maxlen = sizeof(unsigned int), | |
97 | .mode = 0644, | |
98 | .proc_handler = &proc_dointvec_minmax, | |
99 | .strategy = &sysctl_intvec, | |
100 | .extra1 = &min_slot_table_size, | |
101 | .extra2 = &max_slot_table_size | |
102 | }, | |
103 | { | |
104 | .ctl_name = CTL_MIN_RESVPORT, | |
105 | .procname = "min_resvport", | |
106 | .data = &xprt_min_resvport, | |
107 | .maxlen = sizeof(unsigned int), | |
108 | .mode = 0644, | |
109 | .proc_handler = &proc_dointvec_minmax, | |
110 | .strategy = &sysctl_intvec, | |
111 | .extra1 = &xprt_min_resvport_limit, | |
112 | .extra2 = &xprt_max_resvport_limit | |
113 | }, | |
114 | { | |
115 | .ctl_name = CTL_MAX_RESVPORT, | |
116 | .procname = "max_resvport", | |
117 | .data = &xprt_max_resvport, | |
118 | .maxlen = sizeof(unsigned int), | |
119 | .mode = 0644, | |
120 | .proc_handler = &proc_dointvec_minmax, | |
121 | .strategy = &sysctl_intvec, | |
122 | .extra1 = &xprt_min_resvport_limit, | |
123 | .extra2 = &xprt_max_resvport_limit | |
124 | }, | |
25fe6142 TM |
125 | { |
126 | .procname = "tcp_fin_timeout", | |
127 | .data = &xs_tcp_fin_timeout, | |
128 | .maxlen = sizeof(xs_tcp_fin_timeout), | |
129 | .mode = 0644, | |
130 | .proc_handler = &proc_dointvec_jiffies, | |
131 | .strategy = sysctl_jiffies | |
132 | }, | |
fbf76683 CL |
133 | { |
134 | .ctl_name = 0, | |
135 | }, | |
136 | }; | |
137 | ||
138 | static ctl_table sunrpc_table[] = { | |
139 | { | |
140 | .ctl_name = CTL_SUNRPC, | |
141 | .procname = "sunrpc", | |
142 | .mode = 0555, | |
143 | .child = xs_tunables_table | |
144 | }, | |
145 | { | |
146 | .ctl_name = 0, | |
147 | }, | |
148 | }; | |
149 | ||
150 | #endif | |
151 | ||
03bf4b70 CL |
152 | /* |
153 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
154 | * synchronous, but we set a timeout anyway in case of resource | |
155 | * exhaustion on the local host. | |
156 | */ | |
157 | #define XS_UDP_CONN_TO (5U * HZ) | |
158 | ||
159 | /* | |
160 | * Wait duration for an RPC TCP connection to be established. Solaris | |
161 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
162 | * long a server takes to reboot. | |
163 | */ | |
164 | #define XS_TCP_CONN_TO (60U * HZ) | |
165 | ||
166 | /* | |
167 | * Wait duration for a reply from the RPC portmapper. | |
168 | */ | |
169 | #define XS_BIND_TO (60U * HZ) | |
170 | ||
171 | /* | |
172 | * Delay if a UDP socket connect error occurs. This is most likely some | |
173 | * kind of resource problem on the local host. | |
174 | */ | |
175 | #define XS_UDP_REEST_TO (2U * HZ) | |
176 | ||
177 | /* | |
178 | * The reestablish timeout allows clients to delay for a bit before attempting | |
179 | * to reconnect to a server that just dropped our connection. | |
180 | * | |
181 | * We implement an exponential backoff when trying to reestablish a TCP | |
182 | * transport connection with the server. Some servers like to drop a TCP | |
183 | * connection when they are overworked, so we start with a short timeout and | |
184 | * increase over time if the server is down or not responding. | |
185 | */ | |
186 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
187 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
188 | ||
189 | /* | |
190 | * TCP idle timeout; client drops the transport socket if it is idle | |
191 | * for this long. Note that we also timeout UDP sockets to prevent | |
192 | * holding port numbers when there is no RPC traffic. | |
193 | */ | |
194 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
195 | ||
a246b010 CL |
196 | #ifdef RPC_DEBUG |
197 | # undef RPC_DEBUG_DATA | |
9903cd1c | 198 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
199 | #endif |
200 | ||
a246b010 | 201 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 202 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 203 | { |
9903cd1c CL |
204 | u8 *buf = (u8 *) packet; |
205 | int j; | |
a246b010 | 206 | |
46121cf7 | 207 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
208 | for (j = 0; j < count && j < 128; j += 4) { |
209 | if (!(j & 31)) { | |
210 | if (j) | |
211 | dprintk("\n"); | |
212 | dprintk("0x%04x ", j); | |
213 | } | |
214 | dprintk("%02x%02x%02x%02x ", | |
215 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
216 | } | |
217 | dprintk("\n"); | |
218 | } | |
219 | #else | |
9903cd1c | 220 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
221 | { |
222 | /* NOP */ | |
223 | } | |
224 | #endif | |
225 | ||
ffc2e518 CL |
226 | struct sock_xprt { |
227 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
228 | |
229 | /* | |
230 | * Network layer | |
231 | */ | |
232 | struct socket * sock; | |
233 | struct sock * inet; | |
51971139 CL |
234 | |
235 | /* | |
236 | * State of TCP reply receive | |
237 | */ | |
238 | __be32 tcp_fraghdr, | |
239 | tcp_xid; | |
240 | ||
241 | u32 tcp_offset, | |
242 | tcp_reclen; | |
243 | ||
244 | unsigned long tcp_copied, | |
245 | tcp_flags; | |
c8475461 CL |
246 | |
247 | /* | |
248 | * Connection of transports | |
249 | */ | |
34161db6 | 250 | struct delayed_work connect_worker; |
fbfffbd5 CL |
251 | struct sockaddr_storage srcaddr; |
252 | unsigned short srcport; | |
7c6e066e CL |
253 | |
254 | /* | |
255 | * UDP socket buffer size parameters | |
256 | */ | |
257 | size_t rcvsize, | |
258 | sndsize; | |
314dfd79 CL |
259 | |
260 | /* | |
261 | * Saved socket callback addresses | |
262 | */ | |
263 | void (*old_data_ready)(struct sock *, int); | |
264 | void (*old_state_change)(struct sock *); | |
265 | void (*old_write_space)(struct sock *); | |
2a9e1cfa | 266 | void (*old_error_report)(struct sock *); |
ffc2e518 CL |
267 | }; |
268 | ||
e136d092 CL |
269 | /* |
270 | * TCP receive state flags | |
271 | */ | |
272 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
273 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
274 | #define TCP_RCV_COPY_XID (1UL << 2) | |
275 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
276 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
277 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
278 | |
279 | /* | |
280 | * TCP RPC flags | |
281 | */ | |
f4a2e418 | 282 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 283 | |
95392c59 CL |
284 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
285 | { | |
286 | return (struct sockaddr *) &xprt->addr; | |
287 | } | |
288 | ||
289 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) | |
edb267a6 | 290 | { |
95392c59 CL |
291 | return (struct sockaddr_in *) &xprt->addr; |
292 | } | |
293 | ||
294 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
295 | { | |
296 | return (struct sockaddr_in6 *) &xprt->addr; | |
297 | } | |
298 | ||
c877b849 | 299 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 300 | { |
c877b849 | 301 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
302 | struct sockaddr_in6 *sin6; |
303 | struct sockaddr_in *sin; | |
c877b849 | 304 | char buf[128]; |
edb267a6 | 305 | |
c877b849 CL |
306 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
307 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
fbfe3cc6 | 308 | |
9dc3b095 CL |
309 | switch (sap->sa_family) { |
310 | case AF_INET: | |
311 | sin = xs_addr_in(xprt); | |
312 | (void)snprintf(buf, sizeof(buf), "%02x%02x%02x%02x", | |
313 | NIPQUAD(sin->sin_addr.s_addr)); | |
314 | break; | |
315 | case AF_INET6: | |
316 | sin6 = xs_addr_in6(xprt); | |
317 | (void)snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); | |
318 | break; | |
319 | default: | |
320 | BUG(); | |
756805e7 | 321 | } |
9dc3b095 | 322 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
323 | } |
324 | ||
9dc3b095 | 325 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 326 | { |
9dc3b095 CL |
327 | struct sockaddr *sap = xs_addr(xprt); |
328 | char buf[128]; | |
4b6473fb | 329 | |
c877b849 CL |
330 | (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
331 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); | |
4b6473fb | 332 | |
c877b849 CL |
333 | (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
334 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); | |
335 | } | |
4b6473fb | 336 | |
9dc3b095 CL |
337 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
338 | const char *protocol, | |
339 | const char *netid) | |
c877b849 | 340 | { |
b454ae90 | 341 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 342 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 343 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 344 | xs_format_common_peer_ports(xprt); |
edb267a6 | 345 | } |
4b6473fb | 346 | |
9dc3b095 | 347 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 348 | { |
9dc3b095 CL |
349 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
350 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 351 | |
9dc3b095 | 352 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
353 | } |
354 | ||
355 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
356 | { | |
33e01dc7 CL |
357 | unsigned int i; |
358 | ||
359 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
360 | switch (i) { | |
361 | case RPC_DISPLAY_PROTO: | |
362 | case RPC_DISPLAY_NETID: | |
363 | continue; | |
364 | default: | |
365 | kfree(xprt->address_strings[i]); | |
366 | } | |
edb267a6 CL |
367 | } |
368 | ||
b4b5cc85 CL |
369 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
370 | ||
24c5684b | 371 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 372 | { |
b4b5cc85 CL |
373 | struct msghdr msg = { |
374 | .msg_name = addr, | |
375 | .msg_namelen = addrlen, | |
24c5684b TM |
376 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
377 | }; | |
378 | struct kvec iov = { | |
379 | .iov_base = vec->iov_base + base, | |
380 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
381 | }; |
382 | ||
24c5684b | 383 | if (iov.iov_len != 0) |
b4b5cc85 CL |
384 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
385 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
386 | } | |
387 | ||
24c5684b | 388 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 389 | { |
24c5684b TM |
390 | struct page **ppage; |
391 | unsigned int remainder; | |
392 | int err, sent = 0; | |
393 | ||
394 | remainder = xdr->page_len - base; | |
395 | base += xdr->page_base; | |
396 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
397 | base &= ~PAGE_MASK; | |
398 | for(;;) { | |
399 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
400 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 401 | |
24c5684b TM |
402 | remainder -= len; |
403 | if (remainder != 0 || more) | |
404 | flags |= MSG_MORE; | |
405 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
406 | if (remainder == 0 || err != len) | |
407 | break; | |
408 | sent += err; | |
409 | ppage++; | |
410 | base = 0; | |
411 | } | |
412 | if (sent == 0) | |
413 | return err; | |
414 | if (err > 0) | |
415 | sent += err; | |
416 | return sent; | |
b4b5cc85 CL |
417 | } |
418 | ||
9903cd1c CL |
419 | /** |
420 | * xs_sendpages - write pages directly to a socket | |
421 | * @sock: socket to send on | |
422 | * @addr: UDP only -- address of destination | |
423 | * @addrlen: UDP only -- length of destination address | |
424 | * @xdr: buffer containing this request | |
425 | * @base: starting position in the buffer | |
426 | * | |
a246b010 | 427 | */ |
24c5684b | 428 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 429 | { |
24c5684b TM |
430 | unsigned int remainder = xdr->len - base; |
431 | int err, sent = 0; | |
a246b010 | 432 | |
262965f5 | 433 | if (unlikely(!sock)) |
fba91afb | 434 | return -ENOTSOCK; |
262965f5 CL |
435 | |
436 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
437 | if (base != 0) { |
438 | addr = NULL; | |
439 | addrlen = 0; | |
440 | } | |
262965f5 | 441 | |
24c5684b TM |
442 | if (base < xdr->head[0].iov_len || addr != NULL) { |
443 | unsigned int len = xdr->head[0].iov_len - base; | |
444 | remainder -= len; | |
445 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
446 | if (remainder == 0 || err != len) | |
a246b010 | 447 | goto out; |
24c5684b | 448 | sent += err; |
a246b010 CL |
449 | base = 0; |
450 | } else | |
24c5684b | 451 | base -= xdr->head[0].iov_len; |
a246b010 | 452 | |
24c5684b TM |
453 | if (base < xdr->page_len) { |
454 | unsigned int len = xdr->page_len - base; | |
455 | remainder -= len; | |
456 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
457 | if (remainder == 0 || err != len) | |
a246b010 | 458 | goto out; |
24c5684b | 459 | sent += err; |
a246b010 | 460 | base = 0; |
24c5684b TM |
461 | } else |
462 | base -= xdr->page_len; | |
463 | ||
464 | if (base >= xdr->tail[0].iov_len) | |
465 | return sent; | |
466 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 467 | out: |
24c5684b TM |
468 | if (sent == 0) |
469 | return err; | |
470 | if (err > 0) | |
471 | sent += err; | |
472 | return sent; | |
a246b010 CL |
473 | } |
474 | ||
b6ddf64f TM |
475 | static void xs_nospace_callback(struct rpc_task *task) |
476 | { | |
477 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
478 | ||
479 | transport->inet->sk_write_pending--; | |
480 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
481 | } | |
482 | ||
9903cd1c | 483 | /** |
262965f5 CL |
484 | * xs_nospace - place task on wait queue if transmit was incomplete |
485 | * @task: task to put to sleep | |
9903cd1c | 486 | * |
a246b010 | 487 | */ |
5e3771ce | 488 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 489 | { |
262965f5 CL |
490 | struct rpc_rqst *req = task->tk_rqstp; |
491 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 492 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
5e3771ce | 493 | int ret = 0; |
a246b010 | 494 | |
46121cf7 | 495 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
496 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
497 | req->rq_slen); | |
498 | ||
b6ddf64f TM |
499 | /* Protect against races with write_space */ |
500 | spin_lock_bh(&xprt->transport_lock); | |
501 | ||
502 | /* Don't race with disconnect */ | |
503 | if (xprt_connected(xprt)) { | |
504 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
5e3771ce | 505 | ret = -EAGAIN; |
b6ddf64f TM |
506 | /* |
507 | * Notify TCP that we're limited by the application | |
508 | * window size | |
509 | */ | |
510 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
511 | transport->inet->sk_write_pending++; | |
512 | /* ...and wait for more buffer space */ | |
513 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
514 | } | |
515 | } else { | |
516 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 517 | ret = -ENOTCONN; |
b6ddf64f | 518 | } |
262965f5 | 519 | |
b6ddf64f | 520 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 521 | return ret; |
262965f5 CL |
522 | } |
523 | ||
524 | /** | |
525 | * xs_udp_send_request - write an RPC request to a UDP socket | |
526 | * @task: address of RPC task that manages the state of an RPC request | |
527 | * | |
528 | * Return values: | |
529 | * 0: The request has been sent | |
530 | * EAGAIN: The socket was blocked, please call again later to | |
531 | * complete the request | |
532 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
533 | * other: Some other error occured, the request was not sent | |
534 | */ | |
535 | static int xs_udp_send_request(struct rpc_task *task) | |
536 | { | |
537 | struct rpc_rqst *req = task->tk_rqstp; | |
538 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 539 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
540 | struct xdr_buf *xdr = &req->rq_snd_buf; |
541 | int status; | |
a246b010 | 542 | |
9903cd1c | 543 | xs_pktdump("packet data:", |
a246b010 CL |
544 | req->rq_svec->iov_base, |
545 | req->rq_svec->iov_len); | |
546 | ||
01d37c42 TM |
547 | if (!xprt_bound(xprt)) |
548 | return -ENOTCONN; | |
ee0ac0c2 | 549 | status = xs_sendpages(transport->sock, |
95392c59 | 550 | xs_addr(xprt), |
ee0ac0c2 CL |
551 | xprt->addrlen, xdr, |
552 | req->rq_bytes_sent); | |
a246b010 | 553 | |
46121cf7 | 554 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 555 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 556 | |
2199700f TM |
557 | if (status >= 0) { |
558 | task->tk_bytes_sent += status; | |
559 | if (status >= req->rq_slen) | |
560 | return 0; | |
561 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 562 | status = -EAGAIN; |
2199700f | 563 | } |
c8485e4d TM |
564 | if (!transport->sock) |
565 | goto out; | |
a246b010 | 566 | |
262965f5 | 567 | switch (status) { |
fba91afb TM |
568 | case -ENOTSOCK: |
569 | status = -ENOTCONN; | |
570 | /* Should we call xs_close() here? */ | |
571 | break; | |
b6ddf64f | 572 | case -EAGAIN: |
5e3771ce | 573 | status = xs_nospace(task); |
b6ddf64f | 574 | break; |
c8485e4d TM |
575 | default: |
576 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
577 | -status); | |
262965f5 CL |
578 | case -ENETUNREACH: |
579 | case -EPIPE: | |
a246b010 CL |
580 | case -ECONNREFUSED: |
581 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 582 | * prompts ECONNREFUSED. */ |
b6ddf64f | 583 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 584 | } |
c8485e4d | 585 | out: |
262965f5 | 586 | return status; |
a246b010 CL |
587 | } |
588 | ||
e06799f9 TM |
589 | /** |
590 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
591 | * @xprt: transport | |
592 | * | |
593 | * Initiates a graceful shutdown of the TCP socket by calling the | |
594 | * equivalent of shutdown(SHUT_WR); | |
595 | */ | |
596 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
597 | { | |
598 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
599 | struct socket *sock = transport->sock; | |
600 | ||
601 | if (sock != NULL) | |
602 | kernel_sock_shutdown(sock, SHUT_WR); | |
603 | } | |
604 | ||
808012fb CL |
605 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
606 | { | |
607 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
608 | rpc_fraghdr *base = buf->head[0].iov_base; | |
609 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
610 | } | |
611 | ||
9903cd1c | 612 | /** |
262965f5 | 613 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
614 | * @task: address of RPC task that manages the state of an RPC request |
615 | * | |
616 | * Return values: | |
262965f5 CL |
617 | * 0: The request has been sent |
618 | * EAGAIN: The socket was blocked, please call again later to | |
619 | * complete the request | |
620 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
621 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
622 | * |
623 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 624 | * if sendmsg is not able to make progress? |
9903cd1c | 625 | */ |
262965f5 | 626 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
627 | { |
628 | struct rpc_rqst *req = task->tk_rqstp; | |
629 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 630 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 631 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 632 | int status; |
a246b010 | 633 | |
808012fb | 634 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 635 | |
262965f5 CL |
636 | xs_pktdump("packet data:", |
637 | req->rq_svec->iov_base, | |
638 | req->rq_svec->iov_len); | |
a246b010 CL |
639 | |
640 | /* Continue transmitting the packet/record. We must be careful | |
641 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 642 | * called sendmsg(). */ |
a246b010 | 643 | while (1) { |
ee0ac0c2 CL |
644 | status = xs_sendpages(transport->sock, |
645 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 646 | |
46121cf7 | 647 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 648 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 649 | |
262965f5 | 650 | if (unlikely(status < 0)) |
a246b010 | 651 | break; |
a246b010 | 652 | |
262965f5 CL |
653 | /* If we've sent the entire packet, immediately |
654 | * reset the count of bytes sent. */ | |
655 | req->rq_bytes_sent += status; | |
ef759a2e | 656 | task->tk_bytes_sent += status; |
262965f5 CL |
657 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
658 | req->rq_bytes_sent = 0; | |
659 | return 0; | |
660 | } | |
a246b010 | 661 | |
06b4b681 TM |
662 | if (status != 0) |
663 | continue; | |
a246b010 | 664 | status = -EAGAIN; |
06b4b681 | 665 | break; |
a246b010 | 666 | } |
c8485e4d TM |
667 | if (!transport->sock) |
668 | goto out; | |
a246b010 | 669 | |
262965f5 | 670 | switch (status) { |
fba91afb TM |
671 | case -ENOTSOCK: |
672 | status = -ENOTCONN; | |
673 | /* Should we call xs_close() here? */ | |
674 | break; | |
262965f5 | 675 | case -EAGAIN: |
5e3771ce | 676 | status = xs_nospace(task); |
262965f5 | 677 | break; |
c8485e4d TM |
678 | default: |
679 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
680 | -status); | |
262965f5 | 681 | case -ECONNRESET: |
55420c24 | 682 | case -EPIPE: |
2a9e1cfa TM |
683 | xs_tcp_shutdown(xprt); |
684 | case -ECONNREFUSED: | |
262965f5 | 685 | case -ENOTCONN: |
b6ddf64f | 686 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 687 | } |
c8485e4d | 688 | out: |
a246b010 CL |
689 | return status; |
690 | } | |
691 | ||
e0ab53de TM |
692 | /** |
693 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
694 | * @xprt: transport | |
695 | * @task: rpc task | |
696 | * | |
697 | * This cleans up if an error causes us to abort the transmission of a request. | |
698 | * In this case, the socket may need to be reset in order to avoid confusing | |
699 | * the server. | |
700 | */ | |
701 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
702 | { | |
703 | struct rpc_rqst *req; | |
704 | ||
705 | if (task != xprt->snd_task) | |
706 | return; | |
707 | if (task == NULL) | |
708 | goto out_release; | |
709 | req = task->tk_rqstp; | |
710 | if (req->rq_bytes_sent == 0) | |
711 | goto out_release; | |
712 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
713 | goto out_release; | |
714 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
715 | out_release: | |
716 | xprt_release_xprt(xprt, task); | |
717 | } | |
718 | ||
2a9e1cfa TM |
719 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
720 | { | |
721 | transport->old_data_ready = sk->sk_data_ready; | |
722 | transport->old_state_change = sk->sk_state_change; | |
723 | transport->old_write_space = sk->sk_write_space; | |
724 | transport->old_error_report = sk->sk_error_report; | |
725 | } | |
726 | ||
727 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
728 | { | |
729 | sk->sk_data_ready = transport->old_data_ready; | |
730 | sk->sk_state_change = transport->old_state_change; | |
731 | sk->sk_write_space = transport->old_write_space; | |
732 | sk->sk_error_report = transport->old_error_report; | |
733 | } | |
734 | ||
fe315e76 | 735 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 736 | { |
ee0ac0c2 CL |
737 | struct socket *sock = transport->sock; |
738 | struct sock *sk = transport->inet; | |
a246b010 | 739 | |
fe315e76 CL |
740 | if (sk == NULL) |
741 | return; | |
9903cd1c | 742 | |
a246b010 | 743 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
744 | transport->inet = NULL; |
745 | transport->sock = NULL; | |
a246b010 | 746 | |
9903cd1c | 747 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
748 | |
749 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
750 | write_unlock_bh(&sk->sk_callback_lock); |
751 | ||
9903cd1c | 752 | sk->sk_no_check = 0; |
a246b010 CL |
753 | |
754 | sock_release(sock); | |
fe315e76 CL |
755 | } |
756 | ||
757 | /** | |
758 | * xs_close - close a socket | |
759 | * @xprt: transport | |
760 | * | |
761 | * This is used when all requests are complete; ie, no DRC state remains | |
762 | * on the server we want to save. | |
f75e6745 TM |
763 | * |
764 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
765 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
766 | */ |
767 | static void xs_close(struct rpc_xprt *xprt) | |
768 | { | |
769 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
770 | ||
771 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
772 | ||
773 | xs_reset_transport(transport); | |
774 | ||
632e3bdc | 775 | smp_mb__before_clear_bit(); |
7d1e8255 | 776 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 777 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 778 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 779 | smp_mb__after_clear_bit(); |
62da3b24 | 780 | xprt_disconnect_done(xprt); |
a246b010 CL |
781 | } |
782 | ||
f75e6745 TM |
783 | static void xs_tcp_close(struct rpc_xprt *xprt) |
784 | { | |
785 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
786 | xs_close(xprt); | |
787 | else | |
788 | xs_tcp_shutdown(xprt); | |
789 | } | |
790 | ||
9903cd1c CL |
791 | /** |
792 | * xs_destroy - prepare to shutdown a transport | |
793 | * @xprt: doomed transport | |
794 | * | |
795 | */ | |
796 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 797 | { |
c8475461 CL |
798 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
799 | ||
46121cf7 | 800 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 801 | |
c1384c9c | 802 | cancel_rearming_delayed_work(&transport->connect_worker); |
a246b010 | 803 | |
9903cd1c | 804 | xs_close(xprt); |
edb267a6 | 805 | xs_free_peer_addresses(xprt); |
a246b010 | 806 | kfree(xprt->slot); |
c8541ecd | 807 | kfree(xprt); |
bc25571e | 808 | module_put(THIS_MODULE); |
a246b010 CL |
809 | } |
810 | ||
9903cd1c CL |
811 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
812 | { | |
813 | return (struct rpc_xprt *) sk->sk_user_data; | |
814 | } | |
815 | ||
816 | /** | |
817 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
818 | * @sk: socket with data to read | |
819 | * @len: how much data to read | |
820 | * | |
a246b010 | 821 | */ |
9903cd1c | 822 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 823 | { |
9903cd1c CL |
824 | struct rpc_task *task; |
825 | struct rpc_xprt *xprt; | |
a246b010 | 826 | struct rpc_rqst *rovr; |
9903cd1c | 827 | struct sk_buff *skb; |
a246b010 | 828 | int err, repsize, copied; |
d8ed029d AD |
829 | u32 _xid; |
830 | __be32 *xp; | |
a246b010 CL |
831 | |
832 | read_lock(&sk->sk_callback_lock); | |
46121cf7 | 833 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 834 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 835 | goto out; |
a246b010 CL |
836 | |
837 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
838 | goto out; | |
839 | ||
840 | if (xprt->shutdown) | |
841 | goto dropit; | |
842 | ||
843 | repsize = skb->len - sizeof(struct udphdr); | |
844 | if (repsize < 4) { | |
46121cf7 | 845 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
846 | goto dropit; |
847 | } | |
848 | ||
849 | /* Copy the XID from the skb... */ | |
850 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
851 | sizeof(_xid), &_xid); | |
852 | if (xp == NULL) | |
853 | goto dropit; | |
854 | ||
855 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 856 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
857 | rovr = xprt_lookup_rqst(xprt, *xp); |
858 | if (!rovr) | |
859 | goto out_unlock; | |
860 | task = rovr->rq_task; | |
861 | ||
a246b010 CL |
862 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
863 | copied = repsize; | |
864 | ||
865 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
866 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
867 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 868 | goto out_unlock; |
1781f7f5 HX |
869 | } |
870 | ||
871 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 CL |
872 | |
873 | /* Something worked... */ | |
adf30907 | 874 | dst_confirm(skb_dst(skb)); |
a246b010 | 875 | |
1570c1e4 CL |
876 | xprt_adjust_cwnd(task, copied); |
877 | xprt_update_rtt(task); | |
878 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
879 | |
880 | out_unlock: | |
4a0f8c04 | 881 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
882 | dropit: |
883 | skb_free_datagram(sk, skb); | |
884 | out: | |
885 | read_unlock(&sk->sk_callback_lock); | |
886 | } | |
887 | ||
dd456471 | 888 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 889 | { |
51971139 | 890 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
891 | size_t len, used; |
892 | char *p; | |
893 | ||
51971139 CL |
894 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
895 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 896 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 897 | transport->tcp_offset += used; |
a246b010 CL |
898 | if (used != len) |
899 | return; | |
808012fb | 900 | |
51971139 CL |
901 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
902 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 903 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 904 | else |
e136d092 | 905 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 906 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 907 | |
e136d092 | 908 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 909 | transport->tcp_offset = 0; |
808012fb | 910 | |
a246b010 | 911 | /* Sanity check of the record length */ |
18dca02a | 912 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 913 | dprintk("RPC: invalid TCP record fragment length\n"); |
3ebb067d | 914 | xprt_force_disconnect(xprt); |
9903cd1c | 915 | return; |
a246b010 | 916 | } |
46121cf7 | 917 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 918 | transport->tcp_reclen); |
a246b010 CL |
919 | } |
920 | ||
51971139 | 921 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 922 | { |
51971139 | 923 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 924 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 925 | transport->tcp_offset = 0; |
e136d092 CL |
926 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
927 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
928 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 929 | transport->tcp_copied = 0; |
a246b010 CL |
930 | } |
931 | } | |
932 | } | |
933 | ||
dd456471 | 934 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
935 | { |
936 | size_t len, used; | |
937 | char *p; | |
938 | ||
51971139 | 939 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 940 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 941 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 942 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 943 | transport->tcp_offset += used; |
a246b010 CL |
944 | if (used != len) |
945 | return; | |
e136d092 | 946 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 947 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 948 | transport->tcp_copied = 4; |
18dca02a RL |
949 | dprintk("RPC: reading %s XID %08x\n", |
950 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
951 | : "request with", | |
51971139 CL |
952 | ntohl(transport->tcp_xid)); |
953 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
954 | } |
955 | ||
18dca02a RL |
956 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
957 | struct xdr_skb_reader *desc) | |
a246b010 | 958 | { |
18dca02a RL |
959 | size_t len, used; |
960 | u32 offset; | |
961 | __be32 calldir; | |
962 | ||
963 | /* | |
964 | * We want transport->tcp_offset to be 8 at the end of this routine | |
965 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
966 | * When this function is called for the first time, | |
967 | * transport->tcp_offset is 4 (after having already read the xid). | |
968 | */ | |
969 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
970 | len = sizeof(calldir) - offset; | |
971 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); | |
972 | used = xdr_skb_read_bits(desc, &calldir, len); | |
973 | transport->tcp_offset += used; | |
974 | if (used != len) | |
975 | return; | |
f4a2e418 RL |
976 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
977 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
18dca02a | 978 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
f4a2e418 RL |
979 | /* |
980 | * We don't yet have the XDR buffer, so we will write the calldir | |
981 | * out after we get the buffer from the 'struct rpc_rqst' | |
982 | */ | |
18dca02a RL |
983 | if (ntohl(calldir) == RPC_REPLY) |
984 | transport->tcp_flags |= TCP_RPC_REPLY; | |
985 | else | |
986 | transport->tcp_flags &= ~TCP_RPC_REPLY; | |
987 | dprintk("RPC: reading %s CALL/REPLY flag %08x\n", | |
988 | (transport->tcp_flags & TCP_RPC_REPLY) ? | |
989 | "reply for" : "request with", calldir); | |
990 | xs_tcp_check_fraghdr(transport); | |
991 | } | |
992 | ||
44b98efd RL |
993 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
994 | struct xdr_skb_reader *desc, | |
995 | struct rpc_rqst *req) | |
a246b010 | 996 | { |
44b98efd RL |
997 | struct sock_xprt *transport = |
998 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
999 | struct xdr_buf *rcvbuf; |
1000 | size_t len; | |
1001 | ssize_t r; | |
1002 | ||
a246b010 | 1003 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1004 | |
1005 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1006 | /* | |
1007 | * Save the RPC direction in the XDR buffer | |
1008 | */ | |
1009 | __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? | |
1010 | htonl(RPC_REPLY) : 0; | |
1011 | ||
1012 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, | |
1013 | &calldir, sizeof(calldir)); | |
1014 | transport->tcp_copied += sizeof(calldir); | |
1015 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; | |
a246b010 CL |
1016 | } |
1017 | ||
a246b010 | 1018 | len = desc->count; |
51971139 | 1019 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1020 | struct xdr_skb_reader my_desc; |
a246b010 | 1021 | |
51971139 | 1022 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1023 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1024 | my_desc.count = len; | |
51971139 | 1025 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1026 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1027 | desc->count -= r; |
1028 | desc->offset += r; | |
1029 | } else | |
51971139 | 1030 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1031 | desc, xdr_skb_read_bits); |
a246b010 CL |
1032 | |
1033 | if (r > 0) { | |
51971139 CL |
1034 | transport->tcp_copied += r; |
1035 | transport->tcp_offset += r; | |
a246b010 CL |
1036 | } |
1037 | if (r != len) { | |
1038 | /* Error when copying to the receive buffer, | |
1039 | * usually because we weren't able to allocate | |
1040 | * additional buffer pages. All we can do now | |
e136d092 | 1041 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1042 | * will not receive any additional updates, |
1043 | * and time out. | |
1044 | * Any remaining data from this record will | |
1045 | * be discarded. | |
1046 | */ | |
e136d092 | 1047 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1048 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1049 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1050 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1051 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1052 | xprt, transport->tcp_copied, | |
1053 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1054 | return; |
a246b010 CL |
1055 | } |
1056 | ||
46121cf7 | 1057 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1058 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1059 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1060 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1061 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1062 | |
1063 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1064 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1065 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1066 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1067 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 CL |
1068 | } |
1069 | ||
44b98efd RL |
1070 | return; |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Finds the request corresponding to the RPC xid and invokes the common | |
1075 | * tcp read code to read the data. | |
1076 | */ | |
1077 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1078 | struct xdr_skb_reader *desc) | |
1079 | { | |
1080 | struct sock_xprt *transport = | |
1081 | container_of(xprt, struct sock_xprt, xprt); | |
1082 | struct rpc_rqst *req; | |
1083 | ||
1084 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1085 | ||
1086 | /* Find and lock the request corresponding to this xid */ | |
1087 | spin_lock(&xprt->transport_lock); | |
1088 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1089 | if (!req) { | |
1090 | dprintk("RPC: XID %08x request not found!\n", | |
1091 | ntohl(transport->tcp_xid)); | |
1092 | spin_unlock(&xprt->transport_lock); | |
1093 | return -1; | |
1094 | } | |
1095 | ||
1096 | xs_tcp_read_common(xprt, desc, req); | |
1097 | ||
e136d092 | 1098 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1099 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1100 | |
4a0f8c04 | 1101 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1102 | return 0; |
1103 | } | |
1104 | ||
1105 | #if defined(CONFIG_NFS_V4_1) | |
1106 | /* | |
1107 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1108 | * tcp read code to read the data. The result is placed in the callback | |
1109 | * queue. | |
1110 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1111 | * connection and return -1. | |
1112 | */ | |
1113 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1114 | struct xdr_skb_reader *desc) | |
1115 | { | |
1116 | struct sock_xprt *transport = | |
1117 | container_of(xprt, struct sock_xprt, xprt); | |
1118 | struct rpc_rqst *req; | |
1119 | ||
1120 | req = xprt_alloc_bc_request(xprt); | |
1121 | if (req == NULL) { | |
1122 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1123 | xprt_force_disconnect(xprt); | |
1124 | return -1; | |
1125 | } | |
1126 | ||
1127 | req->rq_xid = transport->tcp_xid; | |
1128 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1129 | xs_tcp_read_common(xprt, desc, req); | |
1130 | ||
1131 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1132 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1133 | ||
1134 | /* | |
1135 | * Add callback request to callback list. The callback | |
1136 | * service sleeps on the sv_cb_waitq waiting for new | |
1137 | * requests. Wake it up after adding enqueing the | |
1138 | * request. | |
1139 | */ | |
1140 | dprintk("RPC: add callback request to list\n"); | |
1141 | spin_lock(&bc_serv->sv_cb_lock); | |
1142 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1143 | spin_unlock(&bc_serv->sv_cb_lock); | |
1144 | wake_up(&bc_serv->sv_cb_waitq); | |
1145 | } | |
1146 | ||
1147 | req->rq_private_buf.len = transport->tcp_copied; | |
1148 | ||
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1153 | struct xdr_skb_reader *desc) | |
1154 | { | |
1155 | struct sock_xprt *transport = | |
1156 | container_of(xprt, struct sock_xprt, xprt); | |
1157 | ||
1158 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1159 | xs_tcp_read_reply(xprt, desc) : | |
1160 | xs_tcp_read_callback(xprt, desc); | |
1161 | } | |
1162 | #else | |
1163 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1164 | struct xdr_skb_reader *desc) | |
1165 | { | |
1166 | return xs_tcp_read_reply(xprt, desc); | |
1167 | } | |
1168 | #endif /* CONFIG_NFS_V4_1 */ | |
1169 | ||
1170 | /* | |
1171 | * Read data off the transport. This can be either an RPC_CALL or an | |
1172 | * RPC_REPLY. Relay the processing to helper functions. | |
1173 | */ | |
1174 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1175 | struct xdr_skb_reader *desc) | |
1176 | { | |
1177 | struct sock_xprt *transport = | |
1178 | container_of(xprt, struct sock_xprt, xprt); | |
1179 | ||
1180 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1181 | xs_tcp_check_fraghdr(transport); | |
1182 | else { | |
1183 | /* | |
1184 | * The transport_lock protects the request handling. | |
1185 | * There's no need to hold it to update the tcp_flags. | |
1186 | */ | |
1187 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1188 | } | |
a246b010 CL |
1189 | } |
1190 | ||
dd456471 | 1191 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1192 | { |
1193 | size_t len; | |
1194 | ||
51971139 | 1195 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1196 | if (len > desc->count) |
1197 | len = desc->count; | |
1198 | desc->count -= len; | |
1199 | desc->offset += len; | |
51971139 | 1200 | transport->tcp_offset += len; |
46121cf7 | 1201 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1202 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1203 | } |
1204 | ||
9903cd1c | 1205 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1206 | { |
1207 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1208 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1209 | struct xdr_skb_reader desc = { |
a246b010 CL |
1210 | .skb = skb, |
1211 | .offset = offset, | |
1212 | .count = len, | |
9903cd1c | 1213 | }; |
a246b010 | 1214 | |
46121cf7 | 1215 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1216 | do { |
1217 | /* Read in a new fragment marker if necessary */ | |
1218 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1219 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1220 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1221 | continue; |
1222 | } | |
1223 | /* Read in the xid if necessary */ | |
e136d092 | 1224 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1225 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1226 | continue; |
1227 | } | |
18dca02a | 1228 | /* Read in the call/reply flag */ |
f4a2e418 | 1229 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1230 | xs_tcp_read_calldir(transport, &desc); |
1231 | continue; | |
1232 | } | |
a246b010 | 1233 | /* Read in the request data */ |
e136d092 | 1234 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1235 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1236 | continue; |
1237 | } | |
1238 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1239 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1240 | } while (desc.count); |
46121cf7 | 1241 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1242 | return len - desc.count; |
1243 | } | |
1244 | ||
9903cd1c CL |
1245 | /** |
1246 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1247 | * @sk: socket with data to read | |
1248 | * @bytes: how much data to read | |
1249 | * | |
1250 | */ | |
1251 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1252 | { |
1253 | struct rpc_xprt *xprt; | |
1254 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1255 | int read; |
a246b010 | 1256 | |
46121cf7 CL |
1257 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1258 | ||
a246b010 | 1259 | read_lock(&sk->sk_callback_lock); |
9903cd1c | 1260 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1261 | goto out; |
a246b010 CL |
1262 | if (xprt->shutdown) |
1263 | goto out; | |
1264 | ||
9903cd1c | 1265 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1266 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1267 | do { |
1268 | rd_desc.count = 65536; | |
1269 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1270 | } while (read > 0); | |
a246b010 CL |
1271 | out: |
1272 | read_unlock(&sk->sk_callback_lock); | |
1273 | } | |
1274 | ||
7d1e8255 TM |
1275 | /* |
1276 | * Do the equivalent of linger/linger2 handling for dealing with | |
1277 | * broken servers that don't close the socket in a timely | |
1278 | * fashion | |
1279 | */ | |
1280 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1281 | unsigned long timeout) | |
1282 | { | |
1283 | struct sock_xprt *transport; | |
1284 | ||
1285 | if (xprt_test_and_set_connecting(xprt)) | |
1286 | return; | |
1287 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1288 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1289 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1290 | timeout); | |
1291 | } | |
1292 | ||
1293 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1294 | { | |
1295 | struct sock_xprt *transport; | |
1296 | ||
1297 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1298 | ||
1299 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1300 | !cancel_delayed_work(&transport->connect_worker)) | |
1301 | return; | |
1302 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1303 | xprt_clear_connecting(xprt); | |
1304 | } | |
1305 | ||
1306 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1307 | { | |
1308 | smp_mb__before_clear_bit(); | |
1309 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1310 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1311 | smp_mb__after_clear_bit(); | |
1312 | /* Mark transport as closed and wake up all pending tasks */ | |
1313 | xprt_disconnect_done(xprt); | |
1314 | } | |
1315 | ||
9903cd1c CL |
1316 | /** |
1317 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1318 | * @sk: socket whose state has changed | |
1319 | * | |
1320 | */ | |
1321 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1322 | { |
9903cd1c | 1323 | struct rpc_xprt *xprt; |
a246b010 CL |
1324 | |
1325 | read_lock(&sk->sk_callback_lock); | |
1326 | if (!(xprt = xprt_from_sock(sk))) | |
1327 | goto out; | |
46121cf7 CL |
1328 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1329 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", | |
1330 | sk->sk_state, xprt_connected(xprt), | |
1331 | sock_flag(sk, SOCK_DEAD), | |
1332 | sock_flag(sk, SOCK_ZAPPED)); | |
a246b010 CL |
1333 | |
1334 | switch (sk->sk_state) { | |
1335 | case TCP_ESTABLISHED: | |
4a0f8c04 | 1336 | spin_lock_bh(&xprt->transport_lock); |
a246b010 | 1337 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1338 | struct sock_xprt *transport = container_of(xprt, |
1339 | struct sock_xprt, xprt); | |
1340 | ||
a246b010 | 1341 | /* Reset TCP record info */ |
51971139 CL |
1342 | transport->tcp_offset = 0; |
1343 | transport->tcp_reclen = 0; | |
1344 | transport->tcp_copied = 0; | |
e136d092 CL |
1345 | transport->tcp_flags = |
1346 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1347 | |
2a491991 | 1348 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1349 | } |
4a0f8c04 | 1350 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 | 1351 | break; |
3b948ae5 TM |
1352 | case TCP_FIN_WAIT1: |
1353 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1354 | xprt->connect_cookie++; |
663b8858 | 1355 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1356 | set_bit(XPRT_CLOSING, &xprt->state); |
1357 | smp_mb__before_clear_bit(); | |
1358 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1359 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1360 | smp_mb__after_clear_bit(); |
25fe6142 | 1361 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1362 | break; |
632e3bdc | 1363 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1364 | /* The server initiated a shutdown of the socket */ |
66af1e55 | 1365 | xprt_force_disconnect(xprt); |
663b8858 | 1366 | case TCP_SYN_SENT: |
7c1d71cf | 1367 | xprt->connect_cookie++; |
663b8858 TM |
1368 | case TCP_CLOSING: |
1369 | /* | |
1370 | * If the server closed down the connection, make sure that | |
1371 | * we back off before reconnecting | |
1372 | */ | |
1373 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1374 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1375 | break; |
1376 | case TCP_LAST_ACK: | |
670f9457 | 1377 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1378 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1379 | smp_mb__before_clear_bit(); |
1380 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1381 | smp_mb__after_clear_bit(); | |
1382 | break; | |
1383 | case TCP_CLOSE: | |
7d1e8255 TM |
1384 | xs_tcp_cancel_linger_timeout(xprt); |
1385 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1386 | } |
1387 | out: | |
1388 | read_unlock(&sk->sk_callback_lock); | |
1389 | } | |
1390 | ||
2a9e1cfa | 1391 | /** |
482f32e6 | 1392 | * xs_error_report - callback mainly for catching socket errors |
2a9e1cfa TM |
1393 | * @sk: socket |
1394 | */ | |
482f32e6 | 1395 | static void xs_error_report(struct sock *sk) |
2a9e1cfa TM |
1396 | { |
1397 | struct rpc_xprt *xprt; | |
1398 | ||
1399 | read_lock(&sk->sk_callback_lock); | |
2a9e1cfa TM |
1400 | if (!(xprt = xprt_from_sock(sk))) |
1401 | goto out; | |
1402 | dprintk("RPC: %s client %p...\n" | |
1403 | "RPC: error %d\n", | |
1404 | __func__, xprt, sk->sk_err); | |
482f32e6 | 1405 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
2a9e1cfa TM |
1406 | out: |
1407 | read_unlock(&sk->sk_callback_lock); | |
1408 | } | |
1409 | ||
1f0fa154 IJ |
1410 | static void xs_write_space(struct sock *sk) |
1411 | { | |
1412 | struct socket *sock; | |
1413 | struct rpc_xprt *xprt; | |
1414 | ||
1415 | if (unlikely(!(sock = sk->sk_socket))) | |
1416 | return; | |
1417 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1418 | ||
1419 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1420 | return; | |
1421 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1422 | return; | |
1423 | ||
1424 | xprt_write_space(xprt); | |
1425 | } | |
1426 | ||
9903cd1c | 1427 | /** |
c7b2cae8 CL |
1428 | * xs_udp_write_space - callback invoked when socket buffer space |
1429 | * becomes available | |
9903cd1c CL |
1430 | * @sk: socket whose state has changed |
1431 | * | |
a246b010 CL |
1432 | * Called when more output buffer space is available for this socket. |
1433 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1434 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1435 | * with a bunch of small requests. |
1436 | */ | |
c7b2cae8 | 1437 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1438 | { |
a246b010 | 1439 | read_lock(&sk->sk_callback_lock); |
a246b010 | 1440 | |
c7b2cae8 | 1441 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1442 | if (sock_writeable(sk)) |
1443 | xs_write_space(sk); | |
a246b010 | 1444 | |
c7b2cae8 CL |
1445 | read_unlock(&sk->sk_callback_lock); |
1446 | } | |
a246b010 | 1447 | |
c7b2cae8 CL |
1448 | /** |
1449 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1450 | * becomes available | |
1451 | * @sk: socket whose state has changed | |
1452 | * | |
1453 | * Called when more output buffer space is available for this socket. | |
1454 | * We try not to wake our writers until they can make "significant" | |
1455 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1456 | * with a bunch of small requests. | |
1457 | */ | |
1458 | static void xs_tcp_write_space(struct sock *sk) | |
1459 | { | |
1460 | read_lock(&sk->sk_callback_lock); | |
1461 | ||
1462 | /* from net/core/stream.c:sk_stream_write_space */ | |
1f0fa154 IJ |
1463 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1464 | xs_write_space(sk); | |
b6ddf64f | 1465 | |
a246b010 CL |
1466 | read_unlock(&sk->sk_callback_lock); |
1467 | } | |
1468 | ||
470056c2 | 1469 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1470 | { |
ee0ac0c2 CL |
1471 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1472 | struct sock *sk = transport->inet; | |
a246b010 | 1473 | |
7c6e066e | 1474 | if (transport->rcvsize) { |
a246b010 | 1475 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1476 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1477 | } |
7c6e066e | 1478 | if (transport->sndsize) { |
a246b010 | 1479 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1480 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1481 | sk->sk_write_space(sk); |
1482 | } | |
1483 | } | |
1484 | ||
43118c29 | 1485 | /** |
470056c2 | 1486 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1487 | * @xprt: generic transport |
470056c2 CL |
1488 | * @sndsize: requested size of send buffer, in bytes |
1489 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1490 | * |
470056c2 | 1491 | * Set socket send and receive buffer size limits. |
43118c29 | 1492 | */ |
470056c2 | 1493 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1494 | { |
7c6e066e CL |
1495 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1496 | ||
1497 | transport->sndsize = 0; | |
470056c2 | 1498 | if (sndsize) |
7c6e066e CL |
1499 | transport->sndsize = sndsize + 1024; |
1500 | transport->rcvsize = 0; | |
470056c2 | 1501 | if (rcvsize) |
7c6e066e | 1502 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1503 | |
1504 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1505 | } |
1506 | ||
46c0ee8b CL |
1507 | /** |
1508 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1509 | * @task: task that timed out | |
1510 | * | |
1511 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1512 | */ | |
1513 | static void xs_udp_timer(struct rpc_task *task) | |
1514 | { | |
1515 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1516 | } | |
1517 | ||
b85d8806 CL |
1518 | static unsigned short xs_get_random_port(void) |
1519 | { | |
1520 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1521 | unsigned short rand = (unsigned short) net_random() % range; | |
1522 | return rand + xprt_min_resvport; | |
1523 | } | |
1524 | ||
92200412 CL |
1525 | /** |
1526 | * xs_set_port - reset the port number in the remote endpoint address | |
1527 | * @xprt: generic transport | |
1528 | * @port: new port number | |
1529 | * | |
1530 | */ | |
1531 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1532 | { | |
46121cf7 | 1533 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1534 | |
9dc3b095 CL |
1535 | rpc_set_port(xs_addr(xprt), port); |
1536 | xs_update_peer_port(xprt); | |
92200412 CL |
1537 | } |
1538 | ||
67a391d7 TM |
1539 | static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) |
1540 | { | |
fbfffbd5 | 1541 | unsigned short port = transport->srcport; |
67a391d7 TM |
1542 | |
1543 | if (port == 0 && transport->xprt.resvport) | |
1544 | port = xs_get_random_port(); | |
1545 | return port; | |
1546 | } | |
1547 | ||
1548 | static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) | |
1549 | { | |
fbfffbd5 CL |
1550 | if (transport->srcport != 0) |
1551 | transport->srcport = 0; | |
67a391d7 TM |
1552 | if (!transport->xprt.resvport) |
1553 | return 0; | |
1554 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1555 | return xprt_max_resvport; | |
1556 | return --port; | |
1557 | } | |
1558 | ||
7dc753f0 | 1559 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
a246b010 CL |
1560 | { |
1561 | struct sockaddr_in myaddr = { | |
1562 | .sin_family = AF_INET, | |
1563 | }; | |
d3bc9a1d | 1564 | struct sockaddr_in *sa; |
67a391d7 TM |
1565 | int err, nloop = 0; |
1566 | unsigned short port = xs_get_srcport(transport, sock); | |
1567 | unsigned short last; | |
a246b010 | 1568 | |
fbfffbd5 | 1569 | sa = (struct sockaddr_in *)&transport->srcaddr; |
d3bc9a1d | 1570 | myaddr.sin_addr = sa->sin_addr; |
a246b010 CL |
1571 | do { |
1572 | myaddr.sin_port = htons(port); | |
e6242e92 | 1573 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 | 1574 | sizeof(myaddr)); |
67a391d7 | 1575 | if (port == 0) |
d3bc9a1d | 1576 | break; |
a246b010 | 1577 | if (err == 0) { |
fbfffbd5 | 1578 | transport->srcport = port; |
d3bc9a1d | 1579 | break; |
a246b010 | 1580 | } |
67a391d7 TM |
1581 | last = port; |
1582 | port = xs_next_srcport(transport, sock, port); | |
1583 | if (port > last) | |
1584 | nloop++; | |
1585 | } while (err == -EADDRINUSE && nloop != 2); | |
21454aaa HH |
1586 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", |
1587 | __func__, &myaddr.sin_addr, | |
7dc753f0 | 1588 | port, err ? "failed" : "ok", err); |
a246b010 CL |
1589 | return err; |
1590 | } | |
1591 | ||
90058d37 CL |
1592 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1593 | { | |
1594 | struct sockaddr_in6 myaddr = { | |
1595 | .sin6_family = AF_INET6, | |
1596 | }; | |
1597 | struct sockaddr_in6 *sa; | |
67a391d7 TM |
1598 | int err, nloop = 0; |
1599 | unsigned short port = xs_get_srcport(transport, sock); | |
1600 | unsigned short last; | |
90058d37 | 1601 | |
fbfffbd5 | 1602 | sa = (struct sockaddr_in6 *)&transport->srcaddr; |
90058d37 CL |
1603 | myaddr.sin6_addr = sa->sin6_addr; |
1604 | do { | |
1605 | myaddr.sin6_port = htons(port); | |
1606 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, | |
1607 | sizeof(myaddr)); | |
67a391d7 | 1608 | if (port == 0) |
90058d37 CL |
1609 | break; |
1610 | if (err == 0) { | |
fbfffbd5 | 1611 | transport->srcport = port; |
90058d37 CL |
1612 | break; |
1613 | } | |
67a391d7 TM |
1614 | last = port; |
1615 | port = xs_next_srcport(transport, sock, port); | |
1616 | if (port > last) | |
1617 | nloop++; | |
1618 | } while (err == -EADDRINUSE && nloop != 2); | |
5b095d98 | 1619 | dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", |
fdb46ee7 | 1620 | &myaddr.sin6_addr, port, err ? "failed" : "ok", err); |
a246b010 CL |
1621 | return err; |
1622 | } | |
1623 | ||
ed07536e PZ |
1624 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1625 | static struct lock_class_key xs_key[2]; | |
1626 | static struct lock_class_key xs_slock_key[2]; | |
1627 | ||
8945ee5e | 1628 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1629 | { |
1630 | struct sock *sk = sock->sk; | |
8945ee5e | 1631 | |
02b3d346 | 1632 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1633 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1634 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1635 | } | |
ed07536e | 1636 | |
8945ee5e CL |
1637 | static inline void xs_reclassify_socket6(struct socket *sock) |
1638 | { | |
1639 | struct sock *sk = sock->sk; | |
ed07536e | 1640 | |
f4921aff | 1641 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1642 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1643 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e PZ |
1644 | } |
1645 | #else | |
8945ee5e CL |
1646 | static inline void xs_reclassify_socket4(struct socket *sock) |
1647 | { | |
1648 | } | |
1649 | ||
1650 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1651 | { |
1652 | } | |
1653 | #endif | |
1654 | ||
16be2d20 CL |
1655 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1656 | { | |
1657 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1658 | ||
1659 | if (!transport->inet) { | |
1660 | struct sock *sk = sock->sk; | |
1661 | ||
1662 | write_lock_bh(&sk->sk_callback_lock); | |
1663 | ||
2a9e1cfa TM |
1664 | xs_save_old_callbacks(transport, sk); |
1665 | ||
16be2d20 | 1666 | sk->sk_user_data = xprt; |
16be2d20 CL |
1667 | sk->sk_data_ready = xs_udp_data_ready; |
1668 | sk->sk_write_space = xs_udp_write_space; | |
482f32e6 | 1669 | sk->sk_error_report = xs_error_report; |
16be2d20 CL |
1670 | sk->sk_no_check = UDP_CSUM_NORCV; |
1671 | sk->sk_allocation = GFP_ATOMIC; | |
1672 | ||
1673 | xprt_set_connected(xprt); | |
1674 | ||
1675 | /* Reset to new socket */ | |
1676 | transport->sock = sock; | |
1677 | transport->inet = sk; | |
1678 | ||
1679 | write_unlock_bh(&sk->sk_callback_lock); | |
1680 | } | |
1681 | xs_udp_do_set_buffer_size(xprt); | |
1682 | } | |
1683 | ||
b0d93ad5 | 1684 | /** |
9c3d72de | 1685 | * xs_udp_connect_worker4 - set up a UDP socket |
65f27f38 | 1686 | * @work: RPC transport to connect |
b0d93ad5 CL |
1687 | * |
1688 | * Invoked by a work queue tasklet. | |
1689 | */ | |
9c3d72de | 1690 | static void xs_udp_connect_worker4(struct work_struct *work) |
a246b010 | 1691 | { |
34161db6 TM |
1692 | struct sock_xprt *transport = |
1693 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1694 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1695 | struct socket *sock = transport->sock; |
b0d93ad5 | 1696 | int err, status = -EIO; |
9903cd1c | 1697 | |
01d37c42 | 1698 | if (xprt->shutdown) |
b0d93ad5 | 1699 | goto out; |
9903cd1c | 1700 | |
b0d93ad5 | 1701 | /* Start by resetting any existing state */ |
fe315e76 | 1702 | xs_reset_transport(transport); |
9903cd1c | 1703 | |
fe315e76 CL |
1704 | err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1705 | if (err < 0) { | |
46121cf7 | 1706 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
b0d93ad5 CL |
1707 | goto out; |
1708 | } | |
8945ee5e | 1709 | xs_reclassify_socket4(sock); |
9903cd1c | 1710 | |
7dc753f0 | 1711 | if (xs_bind4(transport, sock)) { |
b0d93ad5 CL |
1712 | sock_release(sock); |
1713 | goto out; | |
1714 | } | |
9903cd1c | 1715 | |
c740eff8 CL |
1716 | dprintk("RPC: worker connecting xprt %p via %s to " |
1717 | "%s (port %s)\n", xprt, | |
1718 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1719 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1720 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 1721 | |
16be2d20 | 1722 | xs_udp_finish_connecting(xprt, sock); |
b0d93ad5 CL |
1723 | status = 0; |
1724 | out: | |
b0d93ad5 | 1725 | xprt_clear_connecting(xprt); |
7d1e8255 | 1726 | xprt_wake_pending_tasks(xprt, status); |
a246b010 | 1727 | } |
a246b010 | 1728 | |
68e220bd CL |
1729 | /** |
1730 | * xs_udp_connect_worker6 - set up a UDP socket | |
1731 | * @work: RPC transport to connect | |
1732 | * | |
1733 | * Invoked by a work queue tasklet. | |
1734 | */ | |
1735 | static void xs_udp_connect_worker6(struct work_struct *work) | |
1736 | { | |
1737 | struct sock_xprt *transport = | |
1738 | container_of(work, struct sock_xprt, connect_worker.work); | |
1739 | struct rpc_xprt *xprt = &transport->xprt; | |
1740 | struct socket *sock = transport->sock; | |
1741 | int err, status = -EIO; | |
a246b010 | 1742 | |
01d37c42 | 1743 | if (xprt->shutdown) |
68e220bd | 1744 | goto out; |
b0d93ad5 | 1745 | |
68e220bd | 1746 | /* Start by resetting any existing state */ |
fe315e76 | 1747 | xs_reset_transport(transport); |
a246b010 | 1748 | |
fe315e76 CL |
1749 | err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1750 | if (err < 0) { | |
68e220bd CL |
1751 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1752 | goto out; | |
1753 | } | |
8945ee5e | 1754 | xs_reclassify_socket6(sock); |
a246b010 | 1755 | |
68e220bd CL |
1756 | if (xs_bind6(transport, sock) < 0) { |
1757 | sock_release(sock); | |
1758 | goto out; | |
b0d93ad5 | 1759 | } |
68e220bd | 1760 | |
c740eff8 CL |
1761 | dprintk("RPC: worker connecting xprt %p via %s to " |
1762 | "%s (port %s)\n", xprt, | |
1763 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1764 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1765 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
1766 | |
1767 | xs_udp_finish_connecting(xprt, sock); | |
b0d93ad5 CL |
1768 | status = 0; |
1769 | out: | |
b0d93ad5 | 1770 | xprt_clear_connecting(xprt); |
7d1e8255 | 1771 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
1772 | } |
1773 | ||
3167e12c CL |
1774 | /* |
1775 | * We need to preserve the port number so the reply cache on the server can | |
1776 | * find our cached RPC replies when we get around to reconnecting. | |
1777 | */ | |
40d2549d | 1778 | static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
3167e12c CL |
1779 | { |
1780 | int result; | |
3167e12c CL |
1781 | struct sockaddr any; |
1782 | ||
46121cf7 | 1783 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
3167e12c CL |
1784 | |
1785 | /* | |
1786 | * Disconnect the transport socket by doing a connect operation | |
1787 | * with AF_UNSPEC. This should return immediately... | |
1788 | */ | |
1789 | memset(&any, 0, sizeof(any)); | |
1790 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1791 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
7d1e8255 TM |
1792 | if (!result) |
1793 | xs_sock_mark_closed(xprt); | |
1794 | else | |
46121cf7 | 1795 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
1796 | result); |
1797 | } | |
1798 | ||
40d2549d TM |
1799 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1800 | { | |
1801 | unsigned int state = transport->inet->sk_state; | |
1802 | ||
1803 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) | |
1804 | return; | |
1805 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) | |
1806 | return; | |
1807 | xs_abort_connection(xprt, transport); | |
1808 | } | |
1809 | ||
16be2d20 | 1810 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 1811 | { |
16be2d20 | 1812 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
edb267a6 | 1813 | |
ee0ac0c2 | 1814 | if (!transport->inet) { |
b0d93ad5 CL |
1815 | struct sock *sk = sock->sk; |
1816 | ||
1817 | write_lock_bh(&sk->sk_callback_lock); | |
1818 | ||
2a9e1cfa TM |
1819 | xs_save_old_callbacks(transport, sk); |
1820 | ||
b0d93ad5 | 1821 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
1822 | sk->sk_data_ready = xs_tcp_data_ready; |
1823 | sk->sk_state_change = xs_tcp_state_change; | |
1824 | sk->sk_write_space = xs_tcp_write_space; | |
482f32e6 | 1825 | sk->sk_error_report = xs_error_report; |
b079fa7b | 1826 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1827 | |
1828 | /* socket options */ | |
1829 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1830 | sock_reset_flag(sk, SOCK_LINGER); | |
1831 | tcp_sk(sk)->linger2 = 0; | |
1832 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1833 | |
1834 | xprt_clear_connected(xprt); | |
1835 | ||
1836 | /* Reset to new socket */ | |
ee0ac0c2 CL |
1837 | transport->sock = sock; |
1838 | transport->inet = sk; | |
b0d93ad5 CL |
1839 | |
1840 | write_unlock_bh(&sk->sk_callback_lock); | |
1841 | } | |
1842 | ||
01d37c42 TM |
1843 | if (!xprt_bound(xprt)) |
1844 | return -ENOTCONN; | |
1845 | ||
b0d93ad5 | 1846 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
1847 | xprt->stat.connect_count++; |
1848 | xprt->stat.connect_start = jiffies; | |
95392c59 | 1849 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
16be2d20 CL |
1850 | } |
1851 | ||
9903cd1c | 1852 | /** |
b61d59ff TM |
1853 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
1854 | * @xprt: RPC transport to connect | |
1855 | * @transport: socket transport to connect | |
1856 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
1857 | * |
1858 | * Invoked by a work queue tasklet. | |
a246b010 | 1859 | */ |
b61d59ff TM |
1860 | static void xs_tcp_setup_socket(struct rpc_xprt *xprt, |
1861 | struct sock_xprt *transport, | |
1862 | struct socket *(*create_sock)(struct rpc_xprt *, | |
1863 | struct sock_xprt *)) | |
a246b010 | 1864 | { |
ee0ac0c2 | 1865 | struct socket *sock = transport->sock; |
b61d59ff | 1866 | int status = -EIO; |
a246b010 | 1867 | |
01d37c42 | 1868 | if (xprt->shutdown) |
a246b010 CL |
1869 | goto out; |
1870 | ||
ee0ac0c2 | 1871 | if (!sock) { |
7d1e8255 | 1872 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
b61d59ff TM |
1873 | sock = create_sock(xprt, transport); |
1874 | if (IS_ERR(sock)) { | |
1875 | status = PTR_ERR(sock); | |
3167e12c CL |
1876 | goto out; |
1877 | } | |
7d1e8255 TM |
1878 | } else { |
1879 | int abort_and_exit; | |
a246b010 | 1880 | |
7d1e8255 TM |
1881 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
1882 | &xprt->state); | |
3167e12c | 1883 | /* "close" the socket, preserving the local port */ |
40d2549d | 1884 | xs_tcp_reuse_connection(xprt, transport); |
a246b010 | 1885 | |
7d1e8255 TM |
1886 | if (abort_and_exit) |
1887 | goto out_eagain; | |
1888 | } | |
a246b010 | 1889 | |
c740eff8 CL |
1890 | dprintk("RPC: worker connecting xprt %p via %s to " |
1891 | "%s (port %s)\n", xprt, | |
1892 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1893 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1894 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 1895 | |
16be2d20 | 1896 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 CL |
1897 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1898 | xprt, -status, xprt_connected(xprt), | |
1899 | sock->sk->sk_state); | |
2a491991 | 1900 | switch (status) { |
f75e6745 TM |
1901 | default: |
1902 | printk("%s: connect returned unhandled error %d\n", | |
1903 | __func__, status); | |
1904 | case -EADDRNOTAVAIL: | |
1905 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
1906 | * and retry | |
1907 | */ | |
1908 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
1909 | xprt_force_disconnect(xprt); | |
88b5ed73 | 1910 | break; |
8a2cec29 TM |
1911 | case -ECONNREFUSED: |
1912 | case -ECONNRESET: | |
1913 | case -ENETUNREACH: | |
1914 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
1915 | case 0: |
1916 | case -EINPROGRESS: | |
1917 | case -EALREADY: | |
7d1e8255 TM |
1918 | xprt_clear_connecting(xprt); |
1919 | return; | |
a246b010 | 1920 | } |
7d1e8255 | 1921 | out_eagain: |
2a491991 | 1922 | status = -EAGAIN; |
a246b010 | 1923 | out: |
68e220bd | 1924 | xprt_clear_connecting(xprt); |
7d1e8255 | 1925 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 1926 | } |
b0d93ad5 | 1927 | |
b61d59ff TM |
1928 | static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, |
1929 | struct sock_xprt *transport) | |
1930 | { | |
1931 | struct socket *sock; | |
1932 | int err; | |
1933 | ||
1934 | /* start from scratch */ | |
1935 | err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1936 | if (err < 0) { | |
1937 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
1938 | -err); | |
1939 | goto out_err; | |
1940 | } | |
1941 | xs_reclassify_socket4(sock); | |
1942 | ||
1943 | if (xs_bind4(transport, sock) < 0) { | |
1944 | sock_release(sock); | |
1945 | goto out_err; | |
1946 | } | |
1947 | return sock; | |
1948 | out_err: | |
1949 | return ERR_PTR(-EIO); | |
68e220bd | 1950 | } |
b0d93ad5 | 1951 | |
68e220bd | 1952 | /** |
b61d59ff | 1953 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
68e220bd CL |
1954 | * @work: RPC transport to connect |
1955 | * | |
1956 | * Invoked by a work queue tasklet. | |
1957 | */ | |
b61d59ff | 1958 | static void xs_tcp_connect_worker4(struct work_struct *work) |
68e220bd CL |
1959 | { |
1960 | struct sock_xprt *transport = | |
1961 | container_of(work, struct sock_xprt, connect_worker.work); | |
1962 | struct rpc_xprt *xprt = &transport->xprt; | |
3167e12c | 1963 | |
b61d59ff TM |
1964 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); |
1965 | } | |
b0d93ad5 | 1966 | |
b61d59ff TM |
1967 | static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, |
1968 | struct sock_xprt *transport) | |
1969 | { | |
1970 | struct socket *sock; | |
1971 | int err; | |
7d1e8255 | 1972 | |
b61d59ff TM |
1973 | /* start from scratch */ |
1974 | err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1975 | if (err < 0) { | |
1976 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
1977 | -err); | |
1978 | goto out_err; | |
1979 | } | |
1980 | xs_reclassify_socket6(sock); | |
b0d93ad5 | 1981 | |
b61d59ff TM |
1982 | if (xs_bind6(transport, sock) < 0) { |
1983 | sock_release(sock); | |
1984 | goto out_err; | |
7d1e8255 | 1985 | } |
b61d59ff TM |
1986 | return sock; |
1987 | out_err: | |
1988 | return ERR_PTR(-EIO); | |
1989 | } | |
b0d93ad5 | 1990 | |
b61d59ff TM |
1991 | /** |
1992 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint | |
1993 | * @work: RPC transport to connect | |
1994 | * | |
1995 | * Invoked by a work queue tasklet. | |
1996 | */ | |
1997 | static void xs_tcp_connect_worker6(struct work_struct *work) | |
1998 | { | |
1999 | struct sock_xprt *transport = | |
2000 | container_of(work, struct sock_xprt, connect_worker.work); | |
2001 | struct rpc_xprt *xprt = &transport->xprt; | |
b0d93ad5 | 2002 | |
b61d59ff | 2003 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); |
a246b010 CL |
2004 | } |
2005 | ||
9903cd1c CL |
2006 | /** |
2007 | * xs_connect - connect a socket to a remote endpoint | |
2008 | * @task: address of RPC task that manages state of connect request | |
2009 | * | |
2010 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2011 | * |
2012 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2013 | * to guarantee that even unprivileged user processes can set up a | |
2014 | * socket on a privileged port. | |
2015 | * | |
2016 | * If a UDP socket connect fails, the delay behavior here prevents | |
2017 | * retry floods (hard mounts). | |
9903cd1c CL |
2018 | */ |
2019 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
2020 | { |
2021 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 2022 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2023 | |
b0d93ad5 CL |
2024 | if (xprt_test_and_set_connecting(xprt)) |
2025 | return; | |
2026 | ||
ee0ac0c2 | 2027 | if (transport->sock != NULL) { |
46121cf7 CL |
2028 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2029 | "seconds\n", | |
03bf4b70 | 2030 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2031 | queue_delayed_work(rpciod_workqueue, |
2032 | &transport->connect_worker, | |
2033 | xprt->reestablish_timeout); | |
03bf4b70 CL |
2034 | xprt->reestablish_timeout <<= 1; |
2035 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) | |
2036 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2037 | } else { |
46121cf7 | 2038 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2039 | queue_delayed_work(rpciod_workqueue, |
2040 | &transport->connect_worker, 0); | |
a246b010 CL |
2041 | } |
2042 | } | |
2043 | ||
e06799f9 TM |
2044 | static void xs_tcp_connect(struct rpc_task *task) |
2045 | { | |
2046 | struct rpc_xprt *xprt = task->tk_xprt; | |
2047 | ||
e06799f9 TM |
2048 | /* Exit if we need to wait for socket shutdown to complete */ |
2049 | if (test_bit(XPRT_CLOSING, &xprt->state)) | |
2050 | return; | |
2051 | xs_connect(task); | |
2052 | } | |
2053 | ||
262ca07d CL |
2054 | /** |
2055 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2056 | * @xprt: rpc_xprt struct containing statistics | |
2057 | * @seq: output file | |
2058 | * | |
2059 | */ | |
2060 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2061 | { | |
c8475461 CL |
2062 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2063 | ||
262ca07d | 2064 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
fbfffbd5 | 2065 | transport->srcport, |
262ca07d CL |
2066 | xprt->stat.bind_count, |
2067 | xprt->stat.sends, | |
2068 | xprt->stat.recvs, | |
2069 | xprt->stat.bad_xids, | |
2070 | xprt->stat.req_u, | |
2071 | xprt->stat.bklog_u); | |
2072 | } | |
2073 | ||
2074 | /** | |
2075 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2076 | * @xprt: rpc_xprt struct containing statistics | |
2077 | * @seq: output file | |
2078 | * | |
2079 | */ | |
2080 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2081 | { | |
c8475461 | 2082 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2083 | long idle_time = 0; |
2084 | ||
2085 | if (xprt_connected(xprt)) | |
2086 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2087 | ||
2088 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
fbfffbd5 | 2089 | transport->srcport, |
262ca07d CL |
2090 | xprt->stat.bind_count, |
2091 | xprt->stat.connect_count, | |
2092 | xprt->stat.connect_time, | |
2093 | idle_time, | |
2094 | xprt->stat.sends, | |
2095 | xprt->stat.recvs, | |
2096 | xprt->stat.bad_xids, | |
2097 | xprt->stat.req_u, | |
2098 | xprt->stat.bklog_u); | |
2099 | } | |
2100 | ||
262965f5 | 2101 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2102 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2103 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2104 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 2105 | .rpcbind = rpcb_getport_async, |
92200412 | 2106 | .set_port = xs_set_port, |
262965f5 | 2107 | .connect = xs_connect, |
02107148 CL |
2108 | .buf_alloc = rpc_malloc, |
2109 | .buf_free = rpc_free, | |
262965f5 | 2110 | .send_request = xs_udp_send_request, |
fe3aca29 | 2111 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2112 | .timer = xs_udp_timer, |
a58dd398 | 2113 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2114 | .close = xs_close, |
2115 | .destroy = xs_destroy, | |
262ca07d | 2116 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2117 | }; |
2118 | ||
2119 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2120 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2121 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 2122 | .rpcbind = rpcb_getport_async, |
92200412 | 2123 | .set_port = xs_set_port, |
e06799f9 | 2124 | .connect = xs_tcp_connect, |
02107148 CL |
2125 | .buf_alloc = rpc_malloc, |
2126 | .buf_free = rpc_free, | |
262965f5 | 2127 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2128 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
0d90ba1c RL |
2129 | #if defined(CONFIG_NFS_V4_1) |
2130 | .release_request = bc_release_request, | |
2131 | #endif /* CONFIG_NFS_V4_1 */ | |
f75e6745 | 2132 | .close = xs_tcp_close, |
9903cd1c | 2133 | .destroy = xs_destroy, |
262ca07d | 2134 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2135 | }; |
2136 | ||
3c341b0b | 2137 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
bc25571e | 2138 | unsigned int slot_table_size) |
c8541ecd CL |
2139 | { |
2140 | struct rpc_xprt *xprt; | |
ffc2e518 | 2141 | struct sock_xprt *new; |
c8541ecd | 2142 | |
96802a09 | 2143 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2144 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2145 | return ERR_PTR(-EBADF); |
2146 | } | |
2147 | ||
ffc2e518 CL |
2148 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
2149 | if (new == NULL) { | |
46121cf7 CL |
2150 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2151 | "rpc_xprt\n"); | |
c8541ecd CL |
2152 | return ERR_PTR(-ENOMEM); |
2153 | } | |
ffc2e518 | 2154 | xprt = &new->xprt; |
c8541ecd CL |
2155 | |
2156 | xprt->max_reqs = slot_table_size; | |
2157 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); | |
2158 | if (xprt->slot == NULL) { | |
2159 | kfree(xprt); | |
46121cf7 CL |
2160 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
2161 | "table\n"); | |
c8541ecd CL |
2162 | return ERR_PTR(-ENOMEM); |
2163 | } | |
2164 | ||
96802a09 FM |
2165 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2166 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2167 | if (args->srcaddr) |
fbfffbd5 | 2168 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
c8541ecd CL |
2169 | |
2170 | return xprt; | |
2171 | } | |
2172 | ||
2881ae74 TM |
2173 | static const struct rpc_timeout xs_udp_default_timeout = { |
2174 | .to_initval = 5 * HZ, | |
2175 | .to_maxval = 30 * HZ, | |
2176 | .to_increment = 5 * HZ, | |
2177 | .to_retries = 5, | |
2178 | }; | |
2179 | ||
9903cd1c CL |
2180 | /** |
2181 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2182 | * @args: rpc transport creation arguments |
9903cd1c CL |
2183 | * |
2184 | */ | |
483066d6 | 2185 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2186 | { |
8f9d5b1a | 2187 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2188 | struct rpc_xprt *xprt; |
c8475461 | 2189 | struct sock_xprt *transport; |
a246b010 | 2190 | |
96802a09 | 2191 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
2192 | if (IS_ERR(xprt)) |
2193 | return xprt; | |
c8475461 | 2194 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2195 | |
ec739ef0 | 2196 | xprt->prot = IPPROTO_UDP; |
808012fb | 2197 | xprt->tsh_size = 0; |
a246b010 CL |
2198 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2199 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2200 | ||
03bf4b70 CL |
2201 | xprt->bind_timeout = XS_BIND_TO; |
2202 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
2203 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
2204 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2205 | |
262965f5 | 2206 | xprt->ops = &xs_udp_ops; |
a246b010 | 2207 | |
ba7392bb | 2208 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2209 | |
8f9d5b1a CL |
2210 | switch (addr->sa_family) { |
2211 | case AF_INET: | |
2212 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2213 | xprt_set_bound(xprt); | |
2214 | ||
2215 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2216 | xs_udp_connect_worker4); | |
9dc3b095 | 2217 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2218 | break; |
2219 | case AF_INET6: | |
2220 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2221 | xprt_set_bound(xprt); | |
2222 | ||
2223 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2224 | xs_udp_connect_worker6); | |
9dc3b095 | 2225 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2226 | break; |
2227 | default: | |
2228 | kfree(xprt); | |
2229 | return ERR_PTR(-EAFNOSUPPORT); | |
2230 | } | |
2231 | ||
c740eff8 CL |
2232 | if (xprt_bound(xprt)) |
2233 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2234 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2235 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2236 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2237 | else | |
2238 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2239 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2240 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2241 | |
bc25571e TT |
2242 | if (try_module_get(THIS_MODULE)) |
2243 | return xprt; | |
2244 | ||
2245 | kfree(xprt->slot); | |
2246 | kfree(xprt); | |
2247 | return ERR_PTR(-EINVAL); | |
a246b010 CL |
2248 | } |
2249 | ||
2881ae74 TM |
2250 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2251 | .to_initval = 60 * HZ, | |
2252 | .to_maxval = 60 * HZ, | |
2253 | .to_retries = 2, | |
2254 | }; | |
2255 | ||
9903cd1c CL |
2256 | /** |
2257 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2258 | * @args: rpc transport creation arguments |
9903cd1c CL |
2259 | * |
2260 | */ | |
483066d6 | 2261 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2262 | { |
8f9d5b1a | 2263 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2264 | struct rpc_xprt *xprt; |
c8475461 | 2265 | struct sock_xprt *transport; |
a246b010 | 2266 | |
96802a09 | 2267 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
2268 | if (IS_ERR(xprt)) |
2269 | return xprt; | |
c8475461 | 2270 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2271 | |
ec739ef0 | 2272 | xprt->prot = IPPROTO_TCP; |
808012fb | 2273 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2274 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2275 | |
03bf4b70 CL |
2276 | xprt->bind_timeout = XS_BIND_TO; |
2277 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
2278 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2279 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2280 | |
262965f5 | 2281 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2282 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2283 | |
8f9d5b1a CL |
2284 | switch (addr->sa_family) { |
2285 | case AF_INET: | |
2286 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2287 | xprt_set_bound(xprt); | |
2288 | ||
9dc3b095 CL |
2289 | INIT_DELAYED_WORK(&transport->connect_worker, |
2290 | xs_tcp_connect_worker4); | |
2291 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); | |
8f9d5b1a CL |
2292 | break; |
2293 | case AF_INET6: | |
2294 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2295 | xprt_set_bound(xprt); | |
2296 | ||
9dc3b095 CL |
2297 | INIT_DELAYED_WORK(&transport->connect_worker, |
2298 | xs_tcp_connect_worker6); | |
2299 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); | |
8f9d5b1a CL |
2300 | break; |
2301 | default: | |
2302 | kfree(xprt); | |
2303 | return ERR_PTR(-EAFNOSUPPORT); | |
2304 | } | |
2305 | ||
c740eff8 CL |
2306 | if (xprt_bound(xprt)) |
2307 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2308 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2309 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2310 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2311 | else | |
2312 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2313 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2314 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2315 | ||
edb267a6 | 2316 | |
bc25571e TT |
2317 | if (try_module_get(THIS_MODULE)) |
2318 | return xprt; | |
2319 | ||
2320 | kfree(xprt->slot); | |
2321 | kfree(xprt); | |
2322 | return ERR_PTR(-EINVAL); | |
a246b010 | 2323 | } |
282b32e1 | 2324 | |
bc25571e TT |
2325 | static struct xprt_class xs_udp_transport = { |
2326 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2327 | .name = "udp", | |
2328 | .owner = THIS_MODULE, | |
4fa016eb | 2329 | .ident = IPPROTO_UDP, |
bc25571e TT |
2330 | .setup = xs_setup_udp, |
2331 | }; | |
2332 | ||
2333 | static struct xprt_class xs_tcp_transport = { | |
2334 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2335 | .name = "tcp", | |
2336 | .owner = THIS_MODULE, | |
4fa016eb | 2337 | .ident = IPPROTO_TCP, |
bc25571e TT |
2338 | .setup = xs_setup_tcp, |
2339 | }; | |
2340 | ||
282b32e1 | 2341 | /** |
bc25571e | 2342 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2343 | * |
2344 | */ | |
2345 | int init_socket_xprt(void) | |
2346 | { | |
fbf76683 | 2347 | #ifdef RPC_DEBUG |
2b1bec5f | 2348 | if (!sunrpc_table_header) |
0b4d4147 | 2349 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2350 | #endif |
2351 | ||
bc25571e TT |
2352 | xprt_register_transport(&xs_udp_transport); |
2353 | xprt_register_transport(&xs_tcp_transport); | |
2354 | ||
282b32e1 CL |
2355 | return 0; |
2356 | } | |
2357 | ||
2358 | /** | |
bc25571e | 2359 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2360 | * |
2361 | */ | |
2362 | void cleanup_socket_xprt(void) | |
2363 | { | |
fbf76683 CL |
2364 | #ifdef RPC_DEBUG |
2365 | if (sunrpc_table_header) { | |
2366 | unregister_sysctl_table(sunrpc_table_header); | |
2367 | sunrpc_table_header = NULL; | |
2368 | } | |
2369 | #endif | |
bc25571e TT |
2370 | |
2371 | xprt_unregister_transport(&xs_udp_transport); | |
2372 | xprt_unregister_transport(&xs_tcp_transport); | |
282b32e1 | 2373 | } |
cbf11071 TM |
2374 | |
2375 | static int param_set_uint_minmax(const char *val, struct kernel_param *kp, | |
2376 | unsigned int min, unsigned int max) | |
2377 | { | |
2378 | unsigned long num; | |
2379 | int ret; | |
2380 | ||
2381 | if (!val) | |
2382 | return -EINVAL; | |
2383 | ret = strict_strtoul(val, 0, &num); | |
2384 | if (ret == -EINVAL || num < min || num > max) | |
2385 | return -EINVAL; | |
2386 | *((unsigned int *)kp->arg) = num; | |
2387 | return 0; | |
2388 | } | |
2389 | ||
2390 | static int param_set_portnr(const char *val, struct kernel_param *kp) | |
2391 | { | |
2392 | return param_set_uint_minmax(val, kp, | |
2393 | RPC_MIN_RESVPORT, | |
2394 | RPC_MAX_RESVPORT); | |
2395 | } | |
2396 | ||
2397 | static int param_get_portnr(char *buffer, struct kernel_param *kp) | |
2398 | { | |
2399 | return param_get_uint(buffer, kp); | |
2400 | } | |
2401 | #define param_check_portnr(name, p) \ | |
2402 | __param_check(name, p, unsigned int); | |
2403 | ||
2404 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
2405 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
2406 | ||
2407 | static int param_set_slot_table_size(const char *val, struct kernel_param *kp) | |
2408 | { | |
2409 | return param_set_uint_minmax(val, kp, | |
2410 | RPC_MIN_SLOT_TABLE, | |
2411 | RPC_MAX_SLOT_TABLE); | |
2412 | } | |
2413 | ||
2414 | static int param_get_slot_table_size(char *buffer, struct kernel_param *kp) | |
2415 | { | |
2416 | return param_get_uint(buffer, kp); | |
2417 | } | |
2418 | #define param_check_slot_table_size(name, p) \ | |
2419 | __param_check(name, p, unsigned int); | |
2420 | ||
2421 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, | |
2422 | slot_table_size, 0644); | |
2423 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, | |
2424 | slot_table_size, 0644); | |
2425 |