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Commit | Line | Data |
---|---|---|
a246b010 CL |
1 | /* |
2 | * linux/net/sunrpc/xprtsock.c | |
3 | * | |
4 | * Client-side transport implementation for sockets. | |
5 | * | |
113aa838 AC |
6 | * TCP callback races fixes (C) 1998 Red Hat |
7 | * TCP send fixes (C) 1998 Red Hat | |
a246b010 CL |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> | |
10 | * | |
11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. | |
12 | * Fix behaviour when socket buffer is full. | |
13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
176e21ee | 22 | #include <linux/string.h> |
a246b010 | 23 | #include <linux/slab.h> |
bc25571e | 24 | #include <linux/module.h> |
a246b010 | 25 | #include <linux/capability.h> |
a246b010 CL |
26 | #include <linux/pagemap.h> |
27 | #include <linux/errno.h> | |
28 | #include <linux/socket.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/mm.h> | |
176e21ee | 32 | #include <linux/un.h> |
a246b010 CL |
33 | #include <linux/udp.h> |
34 | #include <linux/tcp.h> | |
35 | #include <linux/sunrpc/clnt.h> | |
02107148 | 36 | #include <linux/sunrpc/sched.h> |
4cfc7e60 | 37 | #include <linux/sunrpc/svcsock.h> |
49c36fcc | 38 | #include <linux/sunrpc/xprtsock.h> |
a246b010 | 39 | #include <linux/file.h> |
9e00abc3 | 40 | #ifdef CONFIG_SUNRPC_BACKCHANNEL |
44b98efd RL |
41 | #include <linux/sunrpc/bc_xprt.h> |
42 | #endif | |
a246b010 CL |
43 | |
44 | #include <net/sock.h> | |
45 | #include <net/checksum.h> | |
46 | #include <net/udp.h> | |
47 | #include <net/tcp.h> | |
48 | ||
4cfc7e60 | 49 | #include "sunrpc.h" |
176e21ee CL |
50 | |
51 | static void xs_close(struct rpc_xprt *xprt); | |
52 | ||
c556b754 CL |
53 | /* |
54 | * xprtsock tunables | |
55 | */ | |
56 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
57 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
58 | ||
59 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
60 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
61 | ||
7d1e8255 | 62 | #define XS_TCP_LINGER_TO (15U * HZ) |
25fe6142 | 63 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
7d1e8255 | 64 | |
fbf76683 CL |
65 | /* |
66 | * We can register our own files under /proc/sys/sunrpc by | |
67 | * calling register_sysctl_table() again. The files in that | |
68 | * directory become the union of all files registered there. | |
69 | * | |
70 | * We simply need to make sure that we don't collide with | |
71 | * someone else's file names! | |
72 | */ | |
73 | ||
74 | #ifdef RPC_DEBUG | |
75 | ||
76 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
77 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
78 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; | |
79 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
80 | ||
81 | static struct ctl_table_header *sunrpc_table_header; | |
82 | ||
83 | /* | |
84 | * FIXME: changing the UDP slot table size should also resize the UDP | |
85 | * socket buffers for existing UDP transports | |
86 | */ | |
87 | static ctl_table xs_tunables_table[] = { | |
88 | { | |
fbf76683 CL |
89 | .procname = "udp_slot_table_entries", |
90 | .data = &xprt_udp_slot_table_entries, | |
91 | .maxlen = sizeof(unsigned int), | |
92 | .mode = 0644, | |
6d456111 | 93 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
94 | .extra1 = &min_slot_table_size, |
95 | .extra2 = &max_slot_table_size | |
96 | }, | |
97 | { | |
fbf76683 CL |
98 | .procname = "tcp_slot_table_entries", |
99 | .data = &xprt_tcp_slot_table_entries, | |
100 | .maxlen = sizeof(unsigned int), | |
101 | .mode = 0644, | |
6d456111 | 102 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
103 | .extra1 = &min_slot_table_size, |
104 | .extra2 = &max_slot_table_size | |
105 | }, | |
106 | { | |
fbf76683 CL |
107 | .procname = "min_resvport", |
108 | .data = &xprt_min_resvport, | |
109 | .maxlen = sizeof(unsigned int), | |
110 | .mode = 0644, | |
6d456111 | 111 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
112 | .extra1 = &xprt_min_resvport_limit, |
113 | .extra2 = &xprt_max_resvport_limit | |
114 | }, | |
115 | { | |
fbf76683 CL |
116 | .procname = "max_resvport", |
117 | .data = &xprt_max_resvport, | |
118 | .maxlen = sizeof(unsigned int), | |
119 | .mode = 0644, | |
6d456111 | 120 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
121 | .extra1 = &xprt_min_resvport_limit, |
122 | .extra2 = &xprt_max_resvport_limit | |
123 | }, | |
25fe6142 TM |
124 | { |
125 | .procname = "tcp_fin_timeout", | |
126 | .data = &xs_tcp_fin_timeout, | |
127 | .maxlen = sizeof(xs_tcp_fin_timeout), | |
128 | .mode = 0644, | |
6d456111 | 129 | .proc_handler = proc_dointvec_jiffies, |
fbf76683 | 130 | }, |
f8572d8f | 131 | { }, |
fbf76683 CL |
132 | }; |
133 | ||
134 | static ctl_table sunrpc_table[] = { | |
135 | { | |
fbf76683 CL |
136 | .procname = "sunrpc", |
137 | .mode = 0555, | |
138 | .child = xs_tunables_table | |
139 | }, | |
f8572d8f | 140 | { }, |
fbf76683 CL |
141 | }; |
142 | ||
143 | #endif | |
144 | ||
03bf4b70 CL |
145 | /* |
146 | * Wait duration for a reply from the RPC portmapper. | |
147 | */ | |
148 | #define XS_BIND_TO (60U * HZ) | |
149 | ||
150 | /* | |
151 | * Delay if a UDP socket connect error occurs. This is most likely some | |
152 | * kind of resource problem on the local host. | |
153 | */ | |
154 | #define XS_UDP_REEST_TO (2U * HZ) | |
155 | ||
156 | /* | |
157 | * The reestablish timeout allows clients to delay for a bit before attempting | |
158 | * to reconnect to a server that just dropped our connection. | |
159 | * | |
160 | * We implement an exponential backoff when trying to reestablish a TCP | |
161 | * transport connection with the server. Some servers like to drop a TCP | |
162 | * connection when they are overworked, so we start with a short timeout and | |
163 | * increase over time if the server is down or not responding. | |
164 | */ | |
165 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
166 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
167 | ||
168 | /* | |
169 | * TCP idle timeout; client drops the transport socket if it is idle | |
170 | * for this long. Note that we also timeout UDP sockets to prevent | |
171 | * holding port numbers when there is no RPC traffic. | |
172 | */ | |
173 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
174 | ||
a246b010 CL |
175 | #ifdef RPC_DEBUG |
176 | # undef RPC_DEBUG_DATA | |
9903cd1c | 177 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
178 | #endif |
179 | ||
a246b010 | 180 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 181 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 182 | { |
9903cd1c CL |
183 | u8 *buf = (u8 *) packet; |
184 | int j; | |
a246b010 | 185 | |
46121cf7 | 186 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
187 | for (j = 0; j < count && j < 128; j += 4) { |
188 | if (!(j & 31)) { | |
189 | if (j) | |
190 | dprintk("\n"); | |
191 | dprintk("0x%04x ", j); | |
192 | } | |
193 | dprintk("%02x%02x%02x%02x ", | |
194 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
195 | } | |
196 | dprintk("\n"); | |
197 | } | |
198 | #else | |
9903cd1c | 199 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
200 | { |
201 | /* NOP */ | |
202 | } | |
203 | #endif | |
204 | ||
ffc2e518 CL |
205 | struct sock_xprt { |
206 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
207 | |
208 | /* | |
209 | * Network layer | |
210 | */ | |
211 | struct socket * sock; | |
212 | struct sock * inet; | |
51971139 CL |
213 | |
214 | /* | |
215 | * State of TCP reply receive | |
216 | */ | |
217 | __be32 tcp_fraghdr, | |
b76ce561 TM |
218 | tcp_xid, |
219 | tcp_calldir; | |
51971139 CL |
220 | |
221 | u32 tcp_offset, | |
222 | tcp_reclen; | |
223 | ||
224 | unsigned long tcp_copied, | |
225 | tcp_flags; | |
c8475461 CL |
226 | |
227 | /* | |
228 | * Connection of transports | |
229 | */ | |
34161db6 | 230 | struct delayed_work connect_worker; |
fbfffbd5 CL |
231 | struct sockaddr_storage srcaddr; |
232 | unsigned short srcport; | |
7c6e066e CL |
233 | |
234 | /* | |
235 | * UDP socket buffer size parameters | |
236 | */ | |
237 | size_t rcvsize, | |
238 | sndsize; | |
314dfd79 CL |
239 | |
240 | /* | |
241 | * Saved socket callback addresses | |
242 | */ | |
243 | void (*old_data_ready)(struct sock *, int); | |
244 | void (*old_state_change)(struct sock *); | |
245 | void (*old_write_space)(struct sock *); | |
2a9e1cfa | 246 | void (*old_error_report)(struct sock *); |
ffc2e518 CL |
247 | }; |
248 | ||
e136d092 CL |
249 | /* |
250 | * TCP receive state flags | |
251 | */ | |
252 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
253 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
254 | #define TCP_RCV_COPY_XID (1UL << 2) | |
255 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
256 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
257 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
258 | |
259 | /* | |
260 | * TCP RPC flags | |
261 | */ | |
f4a2e418 | 262 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 263 | |
95392c59 CL |
264 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
265 | { | |
266 | return (struct sockaddr *) &xprt->addr; | |
267 | } | |
268 | ||
176e21ee CL |
269 | static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) |
270 | { | |
271 | return (struct sockaddr_un *) &xprt->addr; | |
272 | } | |
273 | ||
95392c59 | 274 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
edb267a6 | 275 | { |
95392c59 CL |
276 | return (struct sockaddr_in *) &xprt->addr; |
277 | } | |
278 | ||
279 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
280 | { | |
281 | return (struct sockaddr_in6 *) &xprt->addr; | |
282 | } | |
283 | ||
c877b849 | 284 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 285 | { |
c877b849 | 286 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
287 | struct sockaddr_in6 *sin6; |
288 | struct sockaddr_in *sin; | |
176e21ee | 289 | struct sockaddr_un *sun; |
c877b849 | 290 | char buf[128]; |
edb267a6 | 291 | |
9dc3b095 | 292 | switch (sap->sa_family) { |
176e21ee CL |
293 | case AF_LOCAL: |
294 | sun = xs_addr_un(xprt); | |
295 | strlcpy(buf, sun->sun_path, sizeof(buf)); | |
296 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
297 | kstrdup(buf, GFP_KERNEL); | |
298 | break; | |
9dc3b095 | 299 | case AF_INET: |
176e21ee CL |
300 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
301 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
302 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 303 | sin = xs_addr_in(xprt); |
fc0b5791 | 304 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
9dc3b095 CL |
305 | break; |
306 | case AF_INET6: | |
176e21ee CL |
307 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
308 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
309 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 310 | sin6 = xs_addr_in6(xprt); |
fc0b5791 | 311 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
9dc3b095 CL |
312 | break; |
313 | default: | |
314 | BUG(); | |
756805e7 | 315 | } |
176e21ee | 316 | |
9dc3b095 | 317 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
318 | } |
319 | ||
9dc3b095 | 320 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 321 | { |
9dc3b095 CL |
322 | struct sockaddr *sap = xs_addr(xprt); |
323 | char buf[128]; | |
4b6473fb | 324 | |
81160e66 | 325 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 326 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
4b6473fb | 327 | |
81160e66 | 328 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 CL |
329 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
330 | } | |
4b6473fb | 331 | |
9dc3b095 CL |
332 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
333 | const char *protocol, | |
334 | const char *netid) | |
c877b849 | 335 | { |
b454ae90 | 336 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 337 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 338 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 339 | xs_format_common_peer_ports(xprt); |
edb267a6 | 340 | } |
4b6473fb | 341 | |
9dc3b095 | 342 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 343 | { |
9dc3b095 CL |
344 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
345 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 346 | |
9dc3b095 | 347 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
348 | } |
349 | ||
350 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
351 | { | |
33e01dc7 CL |
352 | unsigned int i; |
353 | ||
354 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
355 | switch (i) { | |
356 | case RPC_DISPLAY_PROTO: | |
357 | case RPC_DISPLAY_NETID: | |
358 | continue; | |
359 | default: | |
360 | kfree(xprt->address_strings[i]); | |
361 | } | |
edb267a6 CL |
362 | } |
363 | ||
b4b5cc85 CL |
364 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
365 | ||
24c5684b | 366 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 367 | { |
b4b5cc85 CL |
368 | struct msghdr msg = { |
369 | .msg_name = addr, | |
370 | .msg_namelen = addrlen, | |
24c5684b TM |
371 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
372 | }; | |
373 | struct kvec iov = { | |
374 | .iov_base = vec->iov_base + base, | |
375 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
376 | }; |
377 | ||
24c5684b | 378 | if (iov.iov_len != 0) |
b4b5cc85 CL |
379 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
380 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
381 | } | |
382 | ||
24c5684b | 383 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 384 | { |
24c5684b TM |
385 | struct page **ppage; |
386 | unsigned int remainder; | |
387 | int err, sent = 0; | |
388 | ||
389 | remainder = xdr->page_len - base; | |
390 | base += xdr->page_base; | |
391 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
392 | base &= ~PAGE_MASK; | |
393 | for(;;) { | |
394 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
395 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 396 | |
24c5684b TM |
397 | remainder -= len; |
398 | if (remainder != 0 || more) | |
399 | flags |= MSG_MORE; | |
400 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
401 | if (remainder == 0 || err != len) | |
402 | break; | |
403 | sent += err; | |
404 | ppage++; | |
405 | base = 0; | |
406 | } | |
407 | if (sent == 0) | |
408 | return err; | |
409 | if (err > 0) | |
410 | sent += err; | |
411 | return sent; | |
b4b5cc85 CL |
412 | } |
413 | ||
9903cd1c CL |
414 | /** |
415 | * xs_sendpages - write pages directly to a socket | |
416 | * @sock: socket to send on | |
417 | * @addr: UDP only -- address of destination | |
418 | * @addrlen: UDP only -- length of destination address | |
419 | * @xdr: buffer containing this request | |
420 | * @base: starting position in the buffer | |
421 | * | |
a246b010 | 422 | */ |
24c5684b | 423 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 424 | { |
24c5684b TM |
425 | unsigned int remainder = xdr->len - base; |
426 | int err, sent = 0; | |
a246b010 | 427 | |
262965f5 | 428 | if (unlikely(!sock)) |
fba91afb | 429 | return -ENOTSOCK; |
262965f5 CL |
430 | |
431 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
432 | if (base != 0) { |
433 | addr = NULL; | |
434 | addrlen = 0; | |
435 | } | |
262965f5 | 436 | |
24c5684b TM |
437 | if (base < xdr->head[0].iov_len || addr != NULL) { |
438 | unsigned int len = xdr->head[0].iov_len - base; | |
439 | remainder -= len; | |
440 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
441 | if (remainder == 0 || err != len) | |
a246b010 | 442 | goto out; |
24c5684b | 443 | sent += err; |
a246b010 CL |
444 | base = 0; |
445 | } else | |
24c5684b | 446 | base -= xdr->head[0].iov_len; |
a246b010 | 447 | |
24c5684b TM |
448 | if (base < xdr->page_len) { |
449 | unsigned int len = xdr->page_len - base; | |
450 | remainder -= len; | |
451 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
452 | if (remainder == 0 || err != len) | |
a246b010 | 453 | goto out; |
24c5684b | 454 | sent += err; |
a246b010 | 455 | base = 0; |
24c5684b TM |
456 | } else |
457 | base -= xdr->page_len; | |
458 | ||
459 | if (base >= xdr->tail[0].iov_len) | |
460 | return sent; | |
461 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 462 | out: |
24c5684b TM |
463 | if (sent == 0) |
464 | return err; | |
465 | if (err > 0) | |
466 | sent += err; | |
467 | return sent; | |
a246b010 CL |
468 | } |
469 | ||
b6ddf64f TM |
470 | static void xs_nospace_callback(struct rpc_task *task) |
471 | { | |
472 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
473 | ||
474 | transport->inet->sk_write_pending--; | |
475 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
476 | } | |
477 | ||
9903cd1c | 478 | /** |
262965f5 CL |
479 | * xs_nospace - place task on wait queue if transmit was incomplete |
480 | * @task: task to put to sleep | |
9903cd1c | 481 | * |
a246b010 | 482 | */ |
5e3771ce | 483 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 484 | { |
262965f5 CL |
485 | struct rpc_rqst *req = task->tk_rqstp; |
486 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 487 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
5e3771ce | 488 | int ret = 0; |
a246b010 | 489 | |
46121cf7 | 490 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
491 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
492 | req->rq_slen); | |
493 | ||
b6ddf64f TM |
494 | /* Protect against races with write_space */ |
495 | spin_lock_bh(&xprt->transport_lock); | |
496 | ||
497 | /* Don't race with disconnect */ | |
498 | if (xprt_connected(xprt)) { | |
499 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
5e3771ce | 500 | ret = -EAGAIN; |
b6ddf64f TM |
501 | /* |
502 | * Notify TCP that we're limited by the application | |
503 | * window size | |
504 | */ | |
505 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
506 | transport->inet->sk_write_pending++; | |
507 | /* ...and wait for more buffer space */ | |
508 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
509 | } | |
510 | } else { | |
511 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 512 | ret = -ENOTCONN; |
b6ddf64f | 513 | } |
262965f5 | 514 | |
b6ddf64f | 515 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 516 | return ret; |
262965f5 CL |
517 | } |
518 | ||
61677eee CL |
519 | /* |
520 | * Construct a stream transport record marker in @buf. | |
521 | */ | |
522 | static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) | |
523 | { | |
524 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
525 | rpc_fraghdr *base = buf->head[0].iov_base; | |
526 | *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); | |
527 | } | |
528 | ||
176e21ee CL |
529 | /** |
530 | * xs_local_send_request - write an RPC request to an AF_LOCAL socket | |
531 | * @task: RPC task that manages the state of an RPC request | |
532 | * | |
533 | * Return values: | |
534 | * 0: The request has been sent | |
535 | * EAGAIN: The socket was blocked, please call again later to | |
536 | * complete the request | |
537 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
538 | * other: Some other error occured, the request was not sent | |
539 | */ | |
540 | static int xs_local_send_request(struct rpc_task *task) | |
541 | { | |
542 | struct rpc_rqst *req = task->tk_rqstp; | |
543 | struct rpc_xprt *xprt = req->rq_xprt; | |
544 | struct sock_xprt *transport = | |
545 | container_of(xprt, struct sock_xprt, xprt); | |
546 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
547 | int status; | |
548 | ||
549 | xs_encode_stream_record_marker(&req->rq_snd_buf); | |
550 | ||
551 | xs_pktdump("packet data:", | |
552 | req->rq_svec->iov_base, req->rq_svec->iov_len); | |
553 | ||
554 | status = xs_sendpages(transport->sock, NULL, 0, | |
555 | xdr, req->rq_bytes_sent); | |
556 | dprintk("RPC: %s(%u) = %d\n", | |
557 | __func__, xdr->len - req->rq_bytes_sent, status); | |
558 | if (likely(status >= 0)) { | |
559 | req->rq_bytes_sent += status; | |
560 | req->rq_xmit_bytes_sent += status; | |
561 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { | |
562 | req->rq_bytes_sent = 0; | |
563 | return 0; | |
564 | } | |
565 | status = -EAGAIN; | |
566 | } | |
567 | ||
568 | switch (status) { | |
569 | case -EAGAIN: | |
570 | status = xs_nospace(task); | |
571 | break; | |
572 | default: | |
573 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
574 | -status); | |
575 | case -EPIPE: | |
576 | xs_close(xprt); | |
577 | status = -ENOTCONN; | |
578 | } | |
579 | ||
580 | return status; | |
581 | } | |
582 | ||
262965f5 CL |
583 | /** |
584 | * xs_udp_send_request - write an RPC request to a UDP socket | |
585 | * @task: address of RPC task that manages the state of an RPC request | |
586 | * | |
587 | * Return values: | |
588 | * 0: The request has been sent | |
589 | * EAGAIN: The socket was blocked, please call again later to | |
590 | * complete the request | |
591 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 592 | * other: Some other error occurred, the request was not sent |
262965f5 CL |
593 | */ |
594 | static int xs_udp_send_request(struct rpc_task *task) | |
595 | { | |
596 | struct rpc_rqst *req = task->tk_rqstp; | |
597 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 598 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
599 | struct xdr_buf *xdr = &req->rq_snd_buf; |
600 | int status; | |
a246b010 | 601 | |
9903cd1c | 602 | xs_pktdump("packet data:", |
a246b010 CL |
603 | req->rq_svec->iov_base, |
604 | req->rq_svec->iov_len); | |
605 | ||
01d37c42 TM |
606 | if (!xprt_bound(xprt)) |
607 | return -ENOTCONN; | |
ee0ac0c2 | 608 | status = xs_sendpages(transport->sock, |
95392c59 | 609 | xs_addr(xprt), |
ee0ac0c2 CL |
610 | xprt->addrlen, xdr, |
611 | req->rq_bytes_sent); | |
a246b010 | 612 | |
46121cf7 | 613 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 614 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 615 | |
2199700f | 616 | if (status >= 0) { |
d60dbb20 | 617 | req->rq_xmit_bytes_sent += status; |
2199700f TM |
618 | if (status >= req->rq_slen) |
619 | return 0; | |
620 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 621 | status = -EAGAIN; |
2199700f | 622 | } |
a246b010 | 623 | |
262965f5 | 624 | switch (status) { |
fba91afb TM |
625 | case -ENOTSOCK: |
626 | status = -ENOTCONN; | |
627 | /* Should we call xs_close() here? */ | |
628 | break; | |
b6ddf64f | 629 | case -EAGAIN: |
5e3771ce | 630 | status = xs_nospace(task); |
b6ddf64f | 631 | break; |
c8485e4d TM |
632 | default: |
633 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
634 | -status); | |
262965f5 CL |
635 | case -ENETUNREACH: |
636 | case -EPIPE: | |
a246b010 CL |
637 | case -ECONNREFUSED: |
638 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 639 | * prompts ECONNREFUSED. */ |
b6ddf64f | 640 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 641 | } |
5fe46e9d | 642 | |
262965f5 | 643 | return status; |
a246b010 CL |
644 | } |
645 | ||
e06799f9 TM |
646 | /** |
647 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
648 | * @xprt: transport | |
649 | * | |
650 | * Initiates a graceful shutdown of the TCP socket by calling the | |
651 | * equivalent of shutdown(SHUT_WR); | |
652 | */ | |
653 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
654 | { | |
655 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
656 | struct socket *sock = transport->sock; | |
657 | ||
658 | if (sock != NULL) | |
659 | kernel_sock_shutdown(sock, SHUT_WR); | |
660 | } | |
661 | ||
9903cd1c | 662 | /** |
262965f5 | 663 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
664 | * @task: address of RPC task that manages the state of an RPC request |
665 | * | |
666 | * Return values: | |
262965f5 CL |
667 | * 0: The request has been sent |
668 | * EAGAIN: The socket was blocked, please call again later to | |
669 | * complete the request | |
670 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 671 | * other: Some other error occurred, the request was not sent |
9903cd1c CL |
672 | * |
673 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 674 | * if sendmsg is not able to make progress? |
9903cd1c | 675 | */ |
262965f5 | 676 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
677 | { |
678 | struct rpc_rqst *req = task->tk_rqstp; | |
679 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 680 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 681 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 682 | int status; |
a246b010 | 683 | |
61677eee | 684 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
a246b010 | 685 | |
262965f5 CL |
686 | xs_pktdump("packet data:", |
687 | req->rq_svec->iov_base, | |
688 | req->rq_svec->iov_len); | |
a246b010 CL |
689 | |
690 | /* Continue transmitting the packet/record. We must be careful | |
691 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 692 | * called sendmsg(). */ |
a246b010 | 693 | while (1) { |
ee0ac0c2 CL |
694 | status = xs_sendpages(transport->sock, |
695 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 696 | |
46121cf7 | 697 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 698 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 699 | |
262965f5 | 700 | if (unlikely(status < 0)) |
a246b010 | 701 | break; |
a246b010 | 702 | |
262965f5 CL |
703 | /* If we've sent the entire packet, immediately |
704 | * reset the count of bytes sent. */ | |
705 | req->rq_bytes_sent += status; | |
d60dbb20 | 706 | req->rq_xmit_bytes_sent += status; |
262965f5 CL |
707 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
708 | req->rq_bytes_sent = 0; | |
709 | return 0; | |
710 | } | |
a246b010 | 711 | |
06b4b681 TM |
712 | if (status != 0) |
713 | continue; | |
a246b010 | 714 | status = -EAGAIN; |
06b4b681 | 715 | break; |
a246b010 CL |
716 | } |
717 | ||
262965f5 | 718 | switch (status) { |
fba91afb TM |
719 | case -ENOTSOCK: |
720 | status = -ENOTCONN; | |
721 | /* Should we call xs_close() here? */ | |
722 | break; | |
262965f5 | 723 | case -EAGAIN: |
5e3771ce | 724 | status = xs_nospace(task); |
262965f5 | 725 | break; |
c8485e4d TM |
726 | default: |
727 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
728 | -status); | |
262965f5 | 729 | case -ECONNRESET: |
55420c24 | 730 | case -EPIPE: |
2a9e1cfa TM |
731 | xs_tcp_shutdown(xprt); |
732 | case -ECONNREFUSED: | |
262965f5 | 733 | case -ENOTCONN: |
b6ddf64f | 734 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 735 | } |
5fe46e9d | 736 | |
a246b010 CL |
737 | return status; |
738 | } | |
739 | ||
e0ab53de TM |
740 | /** |
741 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
742 | * @xprt: transport | |
743 | * @task: rpc task | |
744 | * | |
745 | * This cleans up if an error causes us to abort the transmission of a request. | |
746 | * In this case, the socket may need to be reset in order to avoid confusing | |
747 | * the server. | |
748 | */ | |
749 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
750 | { | |
751 | struct rpc_rqst *req; | |
752 | ||
753 | if (task != xprt->snd_task) | |
754 | return; | |
755 | if (task == NULL) | |
756 | goto out_release; | |
757 | req = task->tk_rqstp; | |
758 | if (req->rq_bytes_sent == 0) | |
759 | goto out_release; | |
760 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
761 | goto out_release; | |
762 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
763 | out_release: | |
764 | xprt_release_xprt(xprt, task); | |
765 | } | |
766 | ||
2a9e1cfa TM |
767 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
768 | { | |
769 | transport->old_data_ready = sk->sk_data_ready; | |
770 | transport->old_state_change = sk->sk_state_change; | |
771 | transport->old_write_space = sk->sk_write_space; | |
772 | transport->old_error_report = sk->sk_error_report; | |
773 | } | |
774 | ||
775 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
776 | { | |
777 | sk->sk_data_ready = transport->old_data_ready; | |
778 | sk->sk_state_change = transport->old_state_change; | |
779 | sk->sk_write_space = transport->old_write_space; | |
780 | sk->sk_error_report = transport->old_error_report; | |
781 | } | |
782 | ||
fe315e76 | 783 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 784 | { |
ee0ac0c2 CL |
785 | struct socket *sock = transport->sock; |
786 | struct sock *sk = transport->inet; | |
a246b010 | 787 | |
fe315e76 CL |
788 | if (sk == NULL) |
789 | return; | |
9903cd1c | 790 | |
246408dc TM |
791 | transport->srcport = 0; |
792 | ||
a246b010 | 793 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
794 | transport->inet = NULL; |
795 | transport->sock = NULL; | |
a246b010 | 796 | |
9903cd1c | 797 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
798 | |
799 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
800 | write_unlock_bh(&sk->sk_callback_lock); |
801 | ||
9903cd1c | 802 | sk->sk_no_check = 0; |
a246b010 CL |
803 | |
804 | sock_release(sock); | |
fe315e76 CL |
805 | } |
806 | ||
807 | /** | |
808 | * xs_close - close a socket | |
809 | * @xprt: transport | |
810 | * | |
811 | * This is used when all requests are complete; ie, no DRC state remains | |
812 | * on the server we want to save. | |
f75e6745 TM |
813 | * |
814 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
815 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
816 | */ |
817 | static void xs_close(struct rpc_xprt *xprt) | |
818 | { | |
819 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
820 | ||
821 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
822 | ||
823 | xs_reset_transport(transport); | |
61d0a8e6 | 824 | xprt->reestablish_timeout = 0; |
fe315e76 | 825 | |
632e3bdc | 826 | smp_mb__before_clear_bit(); |
7d1e8255 | 827 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 828 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 829 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 830 | smp_mb__after_clear_bit(); |
62da3b24 | 831 | xprt_disconnect_done(xprt); |
a246b010 CL |
832 | } |
833 | ||
f75e6745 TM |
834 | static void xs_tcp_close(struct rpc_xprt *xprt) |
835 | { | |
836 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
837 | xs_close(xprt); | |
838 | else | |
839 | xs_tcp_shutdown(xprt); | |
840 | } | |
841 | ||
9903cd1c CL |
842 | /** |
843 | * xs_destroy - prepare to shutdown a transport | |
844 | * @xprt: doomed transport | |
845 | * | |
846 | */ | |
847 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 848 | { |
c8475461 CL |
849 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
850 | ||
46121cf7 | 851 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 852 | |
afe2c511 | 853 | cancel_delayed_work_sync(&transport->connect_worker); |
a246b010 | 854 | |
9903cd1c | 855 | xs_close(xprt); |
edb267a6 | 856 | xs_free_peer_addresses(xprt); |
e204e621 | 857 | xprt_free(xprt); |
bc25571e | 858 | module_put(THIS_MODULE); |
a246b010 CL |
859 | } |
860 | ||
9903cd1c CL |
861 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
862 | { | |
863 | return (struct rpc_xprt *) sk->sk_user_data; | |
864 | } | |
865 | ||
176e21ee CL |
866 | static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) |
867 | { | |
868 | struct xdr_skb_reader desc = { | |
869 | .skb = skb, | |
870 | .offset = sizeof(rpc_fraghdr), | |
871 | .count = skb->len - sizeof(rpc_fraghdr), | |
872 | }; | |
873 | ||
874 | if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) | |
875 | return -1; | |
876 | if (desc.count) | |
877 | return -1; | |
878 | return 0; | |
879 | } | |
880 | ||
881 | /** | |
882 | * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets | |
883 | * @sk: socket with data to read | |
884 | * @len: how much data to read | |
885 | * | |
886 | * Currently this assumes we can read the whole reply in a single gulp. | |
887 | */ | |
888 | static void xs_local_data_ready(struct sock *sk, int len) | |
889 | { | |
890 | struct rpc_task *task; | |
891 | struct rpc_xprt *xprt; | |
892 | struct rpc_rqst *rovr; | |
893 | struct sk_buff *skb; | |
894 | int err, repsize, copied; | |
895 | u32 _xid; | |
896 | __be32 *xp; | |
897 | ||
898 | read_lock_bh(&sk->sk_callback_lock); | |
899 | dprintk("RPC: %s...\n", __func__); | |
900 | xprt = xprt_from_sock(sk); | |
901 | if (xprt == NULL) | |
902 | goto out; | |
903 | ||
904 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
905 | if (skb == NULL) | |
906 | goto out; | |
907 | ||
908 | if (xprt->shutdown) | |
909 | goto dropit; | |
910 | ||
911 | repsize = skb->len - sizeof(rpc_fraghdr); | |
912 | if (repsize < 4) { | |
913 | dprintk("RPC: impossible RPC reply size %d\n", repsize); | |
914 | goto dropit; | |
915 | } | |
916 | ||
917 | /* Copy the XID from the skb... */ | |
918 | xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); | |
919 | if (xp == NULL) | |
920 | goto dropit; | |
921 | ||
922 | /* Look up and lock the request corresponding to the given XID */ | |
923 | spin_lock(&xprt->transport_lock); | |
924 | rovr = xprt_lookup_rqst(xprt, *xp); | |
925 | if (!rovr) | |
926 | goto out_unlock; | |
927 | task = rovr->rq_task; | |
928 | ||
929 | copied = rovr->rq_private_buf.buflen; | |
930 | if (copied > repsize) | |
931 | copied = repsize; | |
932 | ||
933 | if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { | |
934 | dprintk("RPC: sk_buff copy failed\n"); | |
935 | goto out_unlock; | |
936 | } | |
937 | ||
938 | xprt_complete_rqst(task, copied); | |
939 | ||
940 | out_unlock: | |
941 | spin_unlock(&xprt->transport_lock); | |
942 | dropit: | |
943 | skb_free_datagram(sk, skb); | |
944 | out: | |
945 | read_unlock_bh(&sk->sk_callback_lock); | |
946 | } | |
947 | ||
9903cd1c CL |
948 | /** |
949 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
950 | * @sk: socket with data to read | |
951 | * @len: how much data to read | |
952 | * | |
a246b010 | 953 | */ |
9903cd1c | 954 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 955 | { |
9903cd1c CL |
956 | struct rpc_task *task; |
957 | struct rpc_xprt *xprt; | |
a246b010 | 958 | struct rpc_rqst *rovr; |
9903cd1c | 959 | struct sk_buff *skb; |
a246b010 | 960 | int err, repsize, copied; |
d8ed029d AD |
961 | u32 _xid; |
962 | __be32 *xp; | |
a246b010 | 963 | |
f064af1e | 964 | read_lock_bh(&sk->sk_callback_lock); |
46121cf7 | 965 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 966 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 967 | goto out; |
a246b010 CL |
968 | |
969 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
970 | goto out; | |
971 | ||
972 | if (xprt->shutdown) | |
973 | goto dropit; | |
974 | ||
975 | repsize = skb->len - sizeof(struct udphdr); | |
976 | if (repsize < 4) { | |
46121cf7 | 977 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
978 | goto dropit; |
979 | } | |
980 | ||
981 | /* Copy the XID from the skb... */ | |
982 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
983 | sizeof(_xid), &_xid); | |
984 | if (xp == NULL) | |
985 | goto dropit; | |
986 | ||
987 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 988 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
989 | rovr = xprt_lookup_rqst(xprt, *xp); |
990 | if (!rovr) | |
991 | goto out_unlock; | |
992 | task = rovr->rq_task; | |
993 | ||
a246b010 CL |
994 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
995 | copied = repsize; | |
996 | ||
997 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
998 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
999 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 1000 | goto out_unlock; |
1781f7f5 HX |
1001 | } |
1002 | ||
1003 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 CL |
1004 | |
1005 | /* Something worked... */ | |
adf30907 | 1006 | dst_confirm(skb_dst(skb)); |
a246b010 | 1007 | |
1570c1e4 | 1008 | xprt_adjust_cwnd(task, copied); |
1570c1e4 | 1009 | xprt_complete_rqst(task, copied); |
a246b010 CL |
1010 | |
1011 | out_unlock: | |
4a0f8c04 | 1012 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
1013 | dropit: |
1014 | skb_free_datagram(sk, skb); | |
1015 | out: | |
f064af1e | 1016 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1017 | } |
1018 | ||
dd456471 | 1019 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 1020 | { |
51971139 | 1021 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
1022 | size_t len, used; |
1023 | char *p; | |
1024 | ||
51971139 CL |
1025 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
1026 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 1027 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1028 | transport->tcp_offset += used; |
a246b010 CL |
1029 | if (used != len) |
1030 | return; | |
808012fb | 1031 | |
51971139 CL |
1032 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
1033 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 1034 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 1035 | else |
e136d092 | 1036 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 1037 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 1038 | |
e136d092 | 1039 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 1040 | transport->tcp_offset = 0; |
808012fb | 1041 | |
a246b010 | 1042 | /* Sanity check of the record length */ |
18dca02a | 1043 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 1044 | dprintk("RPC: invalid TCP record fragment length\n"); |
3ebb067d | 1045 | xprt_force_disconnect(xprt); |
9903cd1c | 1046 | return; |
a246b010 | 1047 | } |
46121cf7 | 1048 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 1049 | transport->tcp_reclen); |
a246b010 CL |
1050 | } |
1051 | ||
51971139 | 1052 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 1053 | { |
51971139 | 1054 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 1055 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 1056 | transport->tcp_offset = 0; |
e136d092 CL |
1057 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
1058 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1059 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 1060 | transport->tcp_copied = 0; |
a246b010 CL |
1061 | } |
1062 | } | |
1063 | } | |
1064 | ||
dd456471 | 1065 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1066 | { |
1067 | size_t len, used; | |
1068 | char *p; | |
1069 | ||
51971139 | 1070 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 1071 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 1072 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 1073 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1074 | transport->tcp_offset += used; |
a246b010 CL |
1075 | if (used != len) |
1076 | return; | |
e136d092 | 1077 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 1078 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 1079 | transport->tcp_copied = 4; |
18dca02a RL |
1080 | dprintk("RPC: reading %s XID %08x\n", |
1081 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
1082 | : "request with", | |
51971139 CL |
1083 | ntohl(transport->tcp_xid)); |
1084 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
1085 | } |
1086 | ||
18dca02a RL |
1087 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1088 | struct xdr_skb_reader *desc) | |
a246b010 | 1089 | { |
18dca02a RL |
1090 | size_t len, used; |
1091 | u32 offset; | |
b76ce561 | 1092 | char *p; |
18dca02a RL |
1093 | |
1094 | /* | |
1095 | * We want transport->tcp_offset to be 8 at the end of this routine | |
1096 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
1097 | * When this function is called for the first time, | |
1098 | * transport->tcp_offset is 4 (after having already read the xid). | |
1099 | */ | |
1100 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
b76ce561 | 1101 | len = sizeof(transport->tcp_calldir) - offset; |
18dca02a | 1102 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
b76ce561 TM |
1103 | p = ((char *) &transport->tcp_calldir) + offset; |
1104 | used = xdr_skb_read_bits(desc, p, len); | |
18dca02a RL |
1105 | transport->tcp_offset += used; |
1106 | if (used != len) | |
1107 | return; | |
f4a2e418 | 1108 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
f4a2e418 RL |
1109 | /* |
1110 | * We don't yet have the XDR buffer, so we will write the calldir | |
1111 | * out after we get the buffer from the 'struct rpc_rqst' | |
1112 | */ | |
b76ce561 TM |
1113 | switch (ntohl(transport->tcp_calldir)) { |
1114 | case RPC_REPLY: | |
1115 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1116 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1117 | transport->tcp_flags |= TCP_RPC_REPLY; |
b76ce561 TM |
1118 | break; |
1119 | case RPC_CALL: | |
1120 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1121 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1122 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
b76ce561 TM |
1123 | break; |
1124 | default: | |
1125 | dprintk("RPC: invalid request message type\n"); | |
1126 | xprt_force_disconnect(&transport->xprt); | |
1127 | } | |
18dca02a RL |
1128 | xs_tcp_check_fraghdr(transport); |
1129 | } | |
1130 | ||
44b98efd RL |
1131 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1132 | struct xdr_skb_reader *desc, | |
1133 | struct rpc_rqst *req) | |
a246b010 | 1134 | { |
44b98efd RL |
1135 | struct sock_xprt *transport = |
1136 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1137 | struct xdr_buf *rcvbuf; |
1138 | size_t len; | |
1139 | ssize_t r; | |
1140 | ||
a246b010 | 1141 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1142 | |
1143 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1144 | /* | |
1145 | * Save the RPC direction in the XDR buffer | |
1146 | */ | |
f4a2e418 | 1147 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
b76ce561 TM |
1148 | &transport->tcp_calldir, |
1149 | sizeof(transport->tcp_calldir)); | |
1150 | transport->tcp_copied += sizeof(transport->tcp_calldir); | |
f4a2e418 | 1151 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
a246b010 CL |
1152 | } |
1153 | ||
a246b010 | 1154 | len = desc->count; |
51971139 | 1155 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1156 | struct xdr_skb_reader my_desc; |
a246b010 | 1157 | |
51971139 | 1158 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1159 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1160 | my_desc.count = len; | |
51971139 | 1161 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1162 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1163 | desc->count -= r; |
1164 | desc->offset += r; | |
1165 | } else | |
51971139 | 1166 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1167 | desc, xdr_skb_read_bits); |
a246b010 CL |
1168 | |
1169 | if (r > 0) { | |
51971139 CL |
1170 | transport->tcp_copied += r; |
1171 | transport->tcp_offset += r; | |
a246b010 CL |
1172 | } |
1173 | if (r != len) { | |
1174 | /* Error when copying to the receive buffer, | |
1175 | * usually because we weren't able to allocate | |
1176 | * additional buffer pages. All we can do now | |
e136d092 | 1177 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1178 | * will not receive any additional updates, |
1179 | * and time out. | |
1180 | * Any remaining data from this record will | |
1181 | * be discarded. | |
1182 | */ | |
e136d092 | 1183 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1184 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1185 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1186 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1187 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1188 | xprt, transport->tcp_copied, | |
1189 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1190 | return; |
a246b010 CL |
1191 | } |
1192 | ||
46121cf7 | 1193 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1194 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1195 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1196 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1197 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1198 | |
1199 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1200 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1201 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1202 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1203 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 | 1204 | } |
44b98efd RL |
1205 | } |
1206 | ||
1207 | /* | |
1208 | * Finds the request corresponding to the RPC xid and invokes the common | |
1209 | * tcp read code to read the data. | |
1210 | */ | |
1211 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1212 | struct xdr_skb_reader *desc) | |
1213 | { | |
1214 | struct sock_xprt *transport = | |
1215 | container_of(xprt, struct sock_xprt, xprt); | |
1216 | struct rpc_rqst *req; | |
1217 | ||
1218 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1219 | ||
1220 | /* Find and lock the request corresponding to this xid */ | |
1221 | spin_lock(&xprt->transport_lock); | |
1222 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1223 | if (!req) { | |
1224 | dprintk("RPC: XID %08x request not found!\n", | |
1225 | ntohl(transport->tcp_xid)); | |
1226 | spin_unlock(&xprt->transport_lock); | |
1227 | return -1; | |
1228 | } | |
1229 | ||
1230 | xs_tcp_read_common(xprt, desc, req); | |
1231 | ||
e136d092 | 1232 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1233 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1234 | |
4a0f8c04 | 1235 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1236 | return 0; |
1237 | } | |
1238 | ||
9e00abc3 | 1239 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
44b98efd RL |
1240 | /* |
1241 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1242 | * tcp read code to read the data. The result is placed in the callback | |
1243 | * queue. | |
1244 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1245 | * connection and return -1. | |
1246 | */ | |
1247 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1248 | struct xdr_skb_reader *desc) | |
1249 | { | |
1250 | struct sock_xprt *transport = | |
1251 | container_of(xprt, struct sock_xprt, xprt); | |
1252 | struct rpc_rqst *req; | |
1253 | ||
1254 | req = xprt_alloc_bc_request(xprt); | |
1255 | if (req == NULL) { | |
1256 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1257 | xprt_force_disconnect(xprt); | |
1258 | return -1; | |
1259 | } | |
1260 | ||
1261 | req->rq_xid = transport->tcp_xid; | |
1262 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1263 | xs_tcp_read_common(xprt, desc, req); | |
1264 | ||
1265 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1266 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1267 | ||
1268 | /* | |
1269 | * Add callback request to callback list. The callback | |
1270 | * service sleeps on the sv_cb_waitq waiting for new | |
1271 | * requests. Wake it up after adding enqueing the | |
1272 | * request. | |
1273 | */ | |
1274 | dprintk("RPC: add callback request to list\n"); | |
1275 | spin_lock(&bc_serv->sv_cb_lock); | |
1276 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1277 | spin_unlock(&bc_serv->sv_cb_lock); | |
1278 | wake_up(&bc_serv->sv_cb_waitq); | |
1279 | } | |
1280 | ||
1281 | req->rq_private_buf.len = transport->tcp_copied; | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1287 | struct xdr_skb_reader *desc) | |
1288 | { | |
1289 | struct sock_xprt *transport = | |
1290 | container_of(xprt, struct sock_xprt, xprt); | |
1291 | ||
1292 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1293 | xs_tcp_read_reply(xprt, desc) : | |
1294 | xs_tcp_read_callback(xprt, desc); | |
1295 | } | |
1296 | #else | |
1297 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1298 | struct xdr_skb_reader *desc) | |
1299 | { | |
1300 | return xs_tcp_read_reply(xprt, desc); | |
1301 | } | |
9e00abc3 | 1302 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
44b98efd RL |
1303 | |
1304 | /* | |
1305 | * Read data off the transport. This can be either an RPC_CALL or an | |
1306 | * RPC_REPLY. Relay the processing to helper functions. | |
1307 | */ | |
1308 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1309 | struct xdr_skb_reader *desc) | |
1310 | { | |
1311 | struct sock_xprt *transport = | |
1312 | container_of(xprt, struct sock_xprt, xprt); | |
1313 | ||
1314 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1315 | xs_tcp_check_fraghdr(transport); | |
1316 | else { | |
1317 | /* | |
1318 | * The transport_lock protects the request handling. | |
1319 | * There's no need to hold it to update the tcp_flags. | |
1320 | */ | |
1321 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1322 | } | |
a246b010 CL |
1323 | } |
1324 | ||
dd456471 | 1325 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1326 | { |
1327 | size_t len; | |
1328 | ||
51971139 | 1329 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1330 | if (len > desc->count) |
1331 | len = desc->count; | |
1332 | desc->count -= len; | |
1333 | desc->offset += len; | |
51971139 | 1334 | transport->tcp_offset += len; |
46121cf7 | 1335 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1336 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1337 | } |
1338 | ||
9903cd1c | 1339 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1340 | { |
1341 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1342 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1343 | struct xdr_skb_reader desc = { |
a246b010 CL |
1344 | .skb = skb, |
1345 | .offset = offset, | |
1346 | .count = len, | |
9903cd1c | 1347 | }; |
a246b010 | 1348 | |
46121cf7 | 1349 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1350 | do { |
1351 | /* Read in a new fragment marker if necessary */ | |
1352 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1353 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1354 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1355 | continue; |
1356 | } | |
1357 | /* Read in the xid if necessary */ | |
e136d092 | 1358 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1359 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1360 | continue; |
1361 | } | |
18dca02a | 1362 | /* Read in the call/reply flag */ |
f4a2e418 | 1363 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1364 | xs_tcp_read_calldir(transport, &desc); |
1365 | continue; | |
1366 | } | |
a246b010 | 1367 | /* Read in the request data */ |
e136d092 | 1368 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1369 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1370 | continue; |
1371 | } | |
1372 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1373 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1374 | } while (desc.count); |
46121cf7 | 1375 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1376 | return len - desc.count; |
1377 | } | |
1378 | ||
9903cd1c CL |
1379 | /** |
1380 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1381 | * @sk: socket with data to read | |
1382 | * @bytes: how much data to read | |
1383 | * | |
1384 | */ | |
1385 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1386 | { |
1387 | struct rpc_xprt *xprt; | |
1388 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1389 | int read; |
a246b010 | 1390 | |
46121cf7 CL |
1391 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1392 | ||
f064af1e | 1393 | read_lock_bh(&sk->sk_callback_lock); |
9903cd1c | 1394 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1395 | goto out; |
a246b010 CL |
1396 | if (xprt->shutdown) |
1397 | goto out; | |
1398 | ||
61d0a8e6 NB |
1399 | /* Any data means we had a useful conversation, so |
1400 | * the we don't need to delay the next reconnect | |
1401 | */ | |
1402 | if (xprt->reestablish_timeout) | |
1403 | xprt->reestablish_timeout = 0; | |
1404 | ||
9903cd1c | 1405 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1406 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1407 | do { |
1408 | rd_desc.count = 65536; | |
1409 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1410 | } while (read > 0); | |
a246b010 | 1411 | out: |
f064af1e | 1412 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1413 | } |
1414 | ||
7d1e8255 TM |
1415 | /* |
1416 | * Do the equivalent of linger/linger2 handling for dealing with | |
1417 | * broken servers that don't close the socket in a timely | |
1418 | * fashion | |
1419 | */ | |
1420 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1421 | unsigned long timeout) | |
1422 | { | |
1423 | struct sock_xprt *transport; | |
1424 | ||
1425 | if (xprt_test_and_set_connecting(xprt)) | |
1426 | return; | |
1427 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1428 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1429 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1430 | timeout); | |
1431 | } | |
1432 | ||
1433 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1434 | { | |
1435 | struct sock_xprt *transport; | |
1436 | ||
1437 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1438 | ||
1439 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1440 | !cancel_delayed_work(&transport->connect_worker)) | |
1441 | return; | |
1442 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1443 | xprt_clear_connecting(xprt); | |
1444 | } | |
1445 | ||
1446 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1447 | { | |
1448 | smp_mb__before_clear_bit(); | |
1449 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1450 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1451 | smp_mb__after_clear_bit(); | |
1452 | /* Mark transport as closed and wake up all pending tasks */ | |
1453 | xprt_disconnect_done(xprt); | |
1454 | } | |
1455 | ||
9903cd1c CL |
1456 | /** |
1457 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1458 | * @sk: socket whose state has changed | |
1459 | * | |
1460 | */ | |
1461 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1462 | { |
9903cd1c | 1463 | struct rpc_xprt *xprt; |
a246b010 | 1464 | |
f064af1e | 1465 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1466 | if (!(xprt = xprt_from_sock(sk))) |
1467 | goto out; | |
46121cf7 | 1468 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
669502ff | 1469 | dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
46121cf7 CL |
1470 | sk->sk_state, xprt_connected(xprt), |
1471 | sock_flag(sk, SOCK_DEAD), | |
669502ff AC |
1472 | sock_flag(sk, SOCK_ZAPPED), |
1473 | sk->sk_shutdown); | |
a246b010 CL |
1474 | |
1475 | switch (sk->sk_state) { | |
1476 | case TCP_ESTABLISHED: | |
f064af1e | 1477 | spin_lock(&xprt->transport_lock); |
a246b010 | 1478 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1479 | struct sock_xprt *transport = container_of(xprt, |
1480 | struct sock_xprt, xprt); | |
1481 | ||
a246b010 | 1482 | /* Reset TCP record info */ |
51971139 CL |
1483 | transport->tcp_offset = 0; |
1484 | transport->tcp_reclen = 0; | |
1485 | transport->tcp_copied = 0; | |
e136d092 CL |
1486 | transport->tcp_flags = |
1487 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1488 | |
2a491991 | 1489 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1490 | } |
f064af1e | 1491 | spin_unlock(&xprt->transport_lock); |
a246b010 | 1492 | break; |
3b948ae5 TM |
1493 | case TCP_FIN_WAIT1: |
1494 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1495 | xprt->connect_cookie++; |
663b8858 | 1496 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1497 | set_bit(XPRT_CLOSING, &xprt->state); |
1498 | smp_mb__before_clear_bit(); | |
1499 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1500 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1501 | smp_mb__after_clear_bit(); |
25fe6142 | 1502 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1503 | break; |
632e3bdc | 1504 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1505 | /* The server initiated a shutdown of the socket */ |
66af1e55 | 1506 | xprt_force_disconnect(xprt); |
7c1d71cf | 1507 | xprt->connect_cookie++; |
663b8858 TM |
1508 | case TCP_CLOSING: |
1509 | /* | |
1510 | * If the server closed down the connection, make sure that | |
1511 | * we back off before reconnecting | |
1512 | */ | |
1513 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1514 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1515 | break; |
1516 | case TCP_LAST_ACK: | |
670f9457 | 1517 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1518 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1519 | smp_mb__before_clear_bit(); |
1520 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1521 | smp_mb__after_clear_bit(); | |
1522 | break; | |
1523 | case TCP_CLOSE: | |
7d1e8255 TM |
1524 | xs_tcp_cancel_linger_timeout(xprt); |
1525 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1526 | } |
1527 | out: | |
f064af1e | 1528 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1529 | } |
1530 | ||
2a9e1cfa | 1531 | /** |
482f32e6 | 1532 | * xs_error_report - callback mainly for catching socket errors |
2a9e1cfa TM |
1533 | * @sk: socket |
1534 | */ | |
482f32e6 | 1535 | static void xs_error_report(struct sock *sk) |
2a9e1cfa TM |
1536 | { |
1537 | struct rpc_xprt *xprt; | |
1538 | ||
f064af1e | 1539 | read_lock_bh(&sk->sk_callback_lock); |
2a9e1cfa TM |
1540 | if (!(xprt = xprt_from_sock(sk))) |
1541 | goto out; | |
1542 | dprintk("RPC: %s client %p...\n" | |
1543 | "RPC: error %d\n", | |
1544 | __func__, xprt, sk->sk_err); | |
482f32e6 | 1545 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
2a9e1cfa | 1546 | out: |
f064af1e | 1547 | read_unlock_bh(&sk->sk_callback_lock); |
2a9e1cfa TM |
1548 | } |
1549 | ||
1f0fa154 IJ |
1550 | static void xs_write_space(struct sock *sk) |
1551 | { | |
1552 | struct socket *sock; | |
1553 | struct rpc_xprt *xprt; | |
1554 | ||
1555 | if (unlikely(!(sock = sk->sk_socket))) | |
1556 | return; | |
1557 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1558 | ||
1559 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1560 | return; | |
1561 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1562 | return; | |
1563 | ||
1564 | xprt_write_space(xprt); | |
1565 | } | |
1566 | ||
9903cd1c | 1567 | /** |
c7b2cae8 CL |
1568 | * xs_udp_write_space - callback invoked when socket buffer space |
1569 | * becomes available | |
9903cd1c CL |
1570 | * @sk: socket whose state has changed |
1571 | * | |
a246b010 CL |
1572 | * Called when more output buffer space is available for this socket. |
1573 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1574 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1575 | * with a bunch of small requests. |
1576 | */ | |
c7b2cae8 | 1577 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1578 | { |
f064af1e | 1579 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1580 | |
c7b2cae8 | 1581 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1582 | if (sock_writeable(sk)) |
1583 | xs_write_space(sk); | |
a246b010 | 1584 | |
f064af1e | 1585 | read_unlock_bh(&sk->sk_callback_lock); |
c7b2cae8 | 1586 | } |
a246b010 | 1587 | |
c7b2cae8 CL |
1588 | /** |
1589 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1590 | * becomes available | |
1591 | * @sk: socket whose state has changed | |
1592 | * | |
1593 | * Called when more output buffer space is available for this socket. | |
1594 | * We try not to wake our writers until they can make "significant" | |
1595 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1596 | * with a bunch of small requests. | |
1597 | */ | |
1598 | static void xs_tcp_write_space(struct sock *sk) | |
1599 | { | |
f064af1e | 1600 | read_lock_bh(&sk->sk_callback_lock); |
c7b2cae8 CL |
1601 | |
1602 | /* from net/core/stream.c:sk_stream_write_space */ | |
1f0fa154 IJ |
1603 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1604 | xs_write_space(sk); | |
b6ddf64f | 1605 | |
f064af1e | 1606 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1607 | } |
1608 | ||
470056c2 | 1609 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1610 | { |
ee0ac0c2 CL |
1611 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1612 | struct sock *sk = transport->inet; | |
a246b010 | 1613 | |
7c6e066e | 1614 | if (transport->rcvsize) { |
a246b010 | 1615 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1616 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1617 | } |
7c6e066e | 1618 | if (transport->sndsize) { |
a246b010 | 1619 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1620 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1621 | sk->sk_write_space(sk); |
1622 | } | |
1623 | } | |
1624 | ||
43118c29 | 1625 | /** |
470056c2 | 1626 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1627 | * @xprt: generic transport |
470056c2 CL |
1628 | * @sndsize: requested size of send buffer, in bytes |
1629 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1630 | * |
470056c2 | 1631 | * Set socket send and receive buffer size limits. |
43118c29 | 1632 | */ |
470056c2 | 1633 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1634 | { |
7c6e066e CL |
1635 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1636 | ||
1637 | transport->sndsize = 0; | |
470056c2 | 1638 | if (sndsize) |
7c6e066e CL |
1639 | transport->sndsize = sndsize + 1024; |
1640 | transport->rcvsize = 0; | |
470056c2 | 1641 | if (rcvsize) |
7c6e066e | 1642 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1643 | |
1644 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1645 | } |
1646 | ||
46c0ee8b CL |
1647 | /** |
1648 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1649 | * @task: task that timed out | |
1650 | * | |
1651 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1652 | */ | |
1653 | static void xs_udp_timer(struct rpc_task *task) | |
1654 | { | |
1655 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1656 | } | |
1657 | ||
b85d8806 CL |
1658 | static unsigned short xs_get_random_port(void) |
1659 | { | |
1660 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1661 | unsigned short rand = (unsigned short) net_random() % range; | |
1662 | return rand + xprt_min_resvport; | |
1663 | } | |
1664 | ||
92200412 CL |
1665 | /** |
1666 | * xs_set_port - reset the port number in the remote endpoint address | |
1667 | * @xprt: generic transport | |
1668 | * @port: new port number | |
1669 | * | |
1670 | */ | |
1671 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1672 | { | |
46121cf7 | 1673 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1674 | |
9dc3b095 CL |
1675 | rpc_set_port(xs_addr(xprt), port); |
1676 | xs_update_peer_port(xprt); | |
92200412 CL |
1677 | } |
1678 | ||
5d4ec932 | 1679 | static unsigned short xs_get_srcport(struct sock_xprt *transport) |
67a391d7 | 1680 | { |
fbfffbd5 | 1681 | unsigned short port = transport->srcport; |
67a391d7 TM |
1682 | |
1683 | if (port == 0 && transport->xprt.resvport) | |
1684 | port = xs_get_random_port(); | |
1685 | return port; | |
1686 | } | |
1687 | ||
baaf4e48 | 1688 | static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
67a391d7 | 1689 | { |
fbfffbd5 CL |
1690 | if (transport->srcport != 0) |
1691 | transport->srcport = 0; | |
67a391d7 TM |
1692 | if (!transport->xprt.resvport) |
1693 | return 0; | |
1694 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1695 | return xprt_max_resvport; | |
1696 | return --port; | |
1697 | } | |
beb59b68 | 1698 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
a246b010 | 1699 | { |
beb59b68 | 1700 | struct sockaddr_storage myaddr; |
67a391d7 | 1701 | int err, nloop = 0; |
5d4ec932 | 1702 | unsigned short port = xs_get_srcport(transport); |
67a391d7 | 1703 | unsigned short last; |
a246b010 | 1704 | |
beb59b68 | 1705 | memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
a246b010 | 1706 | do { |
beb59b68 PE |
1707 | rpc_set_port((struct sockaddr *)&myaddr, port); |
1708 | err = kernel_bind(sock, (struct sockaddr *)&myaddr, | |
1709 | transport->xprt.addrlen); | |
67a391d7 | 1710 | if (port == 0) |
d3bc9a1d | 1711 | break; |
a246b010 | 1712 | if (err == 0) { |
fbfffbd5 | 1713 | transport->srcport = port; |
d3bc9a1d | 1714 | break; |
a246b010 | 1715 | } |
67a391d7 | 1716 | last = port; |
baaf4e48 | 1717 | port = xs_next_srcport(transport, port); |
67a391d7 TM |
1718 | if (port > last) |
1719 | nloop++; | |
1720 | } while (err == -EADDRINUSE && nloop != 2); | |
90058d37 | 1721 | |
4232e863 | 1722 | if (myaddr.ss_family == AF_INET) |
beb59b68 PE |
1723 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
1724 | &((struct sockaddr_in *)&myaddr)->sin_addr, | |
1725 | port, err ? "failed" : "ok", err); | |
1726 | else | |
1727 | dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, | |
1728 | &((struct sockaddr_in6 *)&myaddr)->sin6_addr, | |
1729 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1730 | return err; |
1731 | } | |
1732 | ||
176e21ee CL |
1733 | /* |
1734 | * We don't support autobind on AF_LOCAL sockets | |
1735 | */ | |
1736 | static void xs_local_rpcbind(struct rpc_task *task) | |
1737 | { | |
1738 | xprt_set_bound(task->tk_xprt); | |
1739 | } | |
1740 | ||
1741 | static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1742 | { | |
1743 | } | |
beb59b68 | 1744 | |
ed07536e PZ |
1745 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1746 | static struct lock_class_key xs_key[2]; | |
1747 | static struct lock_class_key xs_slock_key[2]; | |
1748 | ||
176e21ee CL |
1749 | static inline void xs_reclassify_socketu(struct socket *sock) |
1750 | { | |
1751 | struct sock *sk = sock->sk; | |
1752 | ||
1753 | BUG_ON(sock_owned_by_user(sk)); | |
1754 | sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", | |
1755 | &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); | |
1756 | } | |
1757 | ||
8945ee5e | 1758 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1759 | { |
1760 | struct sock *sk = sock->sk; | |
8945ee5e | 1761 | |
02b3d346 | 1762 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1763 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1764 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1765 | } | |
ed07536e | 1766 | |
8945ee5e CL |
1767 | static inline void xs_reclassify_socket6(struct socket *sock) |
1768 | { | |
1769 | struct sock *sk = sock->sk; | |
ed07536e | 1770 | |
f4921aff | 1771 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1772 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1773 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e | 1774 | } |
6bc9638a PE |
1775 | |
1776 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1777 | { | |
4232e863 | 1778 | switch (family) { |
176e21ee CL |
1779 | case AF_LOCAL: |
1780 | xs_reclassify_socketu(sock); | |
1781 | break; | |
4232e863 | 1782 | case AF_INET: |
6bc9638a | 1783 | xs_reclassify_socket4(sock); |
4232e863 CL |
1784 | break; |
1785 | case AF_INET6: | |
6bc9638a | 1786 | xs_reclassify_socket6(sock); |
4232e863 CL |
1787 | break; |
1788 | } | |
6bc9638a | 1789 | } |
ed07536e | 1790 | #else |
176e21ee CL |
1791 | static inline void xs_reclassify_socketu(struct socket *sock) |
1792 | { | |
1793 | } | |
1794 | ||
8945ee5e CL |
1795 | static inline void xs_reclassify_socket4(struct socket *sock) |
1796 | { | |
1797 | } | |
1798 | ||
1799 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1800 | { |
1801 | } | |
6bc9638a PE |
1802 | |
1803 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1804 | { | |
1805 | } | |
ed07536e PZ |
1806 | #endif |
1807 | ||
6bc9638a PE |
1808 | static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
1809 | struct sock_xprt *transport, int family, int type, int protocol) | |
22f79326 PE |
1810 | { |
1811 | struct socket *sock; | |
1812 | int err; | |
1813 | ||
6bc9638a | 1814 | err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
22f79326 PE |
1815 | if (err < 0) { |
1816 | dprintk("RPC: can't create %d transport socket (%d).\n", | |
1817 | protocol, -err); | |
1818 | goto out; | |
1819 | } | |
6bc9638a | 1820 | xs_reclassify_socket(family, sock); |
22f79326 | 1821 | |
4cea288a BH |
1822 | err = xs_bind(transport, sock); |
1823 | if (err) { | |
22f79326 PE |
1824 | sock_release(sock); |
1825 | goto out; | |
1826 | } | |
1827 | ||
1828 | return sock; | |
1829 | out: | |
1830 | return ERR_PTR(err); | |
1831 | } | |
1832 | ||
176e21ee CL |
1833 | static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
1834 | struct socket *sock) | |
1835 | { | |
1836 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1837 | xprt); | |
1838 | ||
1839 | if (!transport->inet) { | |
1840 | struct sock *sk = sock->sk; | |
1841 | ||
1842 | write_lock_bh(&sk->sk_callback_lock); | |
1843 | ||
1844 | xs_save_old_callbacks(transport, sk); | |
1845 | ||
1846 | sk->sk_user_data = xprt; | |
1847 | sk->sk_data_ready = xs_local_data_ready; | |
1848 | sk->sk_write_space = xs_udp_write_space; | |
1849 | sk->sk_error_report = xs_error_report; | |
1850 | sk->sk_allocation = GFP_ATOMIC; | |
1851 | ||
1852 | xprt_clear_connected(xprt); | |
1853 | ||
1854 | /* Reset to new socket */ | |
1855 | transport->sock = sock; | |
1856 | transport->inet = sk; | |
1857 | ||
1858 | write_unlock_bh(&sk->sk_callback_lock); | |
1859 | } | |
1860 | ||
1861 | /* Tell the socket layer to start connecting... */ | |
1862 | xprt->stat.connect_count++; | |
1863 | xprt->stat.connect_start = jiffies; | |
1864 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); | |
1865 | } | |
1866 | ||
1867 | /** | |
1868 | * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint | |
1869 | * @xprt: RPC transport to connect | |
1870 | * @transport: socket transport to connect | |
1871 | * @create_sock: function to create a socket of the correct type | |
1872 | * | |
1873 | * Invoked by a work queue tasklet. | |
1874 | */ | |
1875 | static void xs_local_setup_socket(struct work_struct *work) | |
1876 | { | |
1877 | struct sock_xprt *transport = | |
1878 | container_of(work, struct sock_xprt, connect_worker.work); | |
1879 | struct rpc_xprt *xprt = &transport->xprt; | |
1880 | struct socket *sock; | |
1881 | int status = -EIO; | |
1882 | ||
1883 | if (xprt->shutdown) | |
1884 | goto out; | |
1885 | ||
1886 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1887 | status = __sock_create(xprt->xprt_net, AF_LOCAL, | |
1888 | SOCK_STREAM, 0, &sock, 1); | |
1889 | if (status < 0) { | |
1890 | dprintk("RPC: can't create AF_LOCAL " | |
1891 | "transport socket (%d).\n", -status); | |
1892 | goto out; | |
1893 | } | |
1894 | xs_reclassify_socketu(sock); | |
1895 | ||
1896 | dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", | |
1897 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1898 | ||
1899 | status = xs_local_finish_connecting(xprt, sock); | |
1900 | switch (status) { | |
1901 | case 0: | |
1902 | dprintk("RPC: xprt %p connected to %s\n", | |
1903 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1904 | xprt_set_connected(xprt); | |
1905 | break; | |
1906 | case -ENOENT: | |
1907 | dprintk("RPC: xprt %p: socket %s does not exist\n", | |
1908 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1909 | break; | |
1910 | default: | |
1911 | printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", | |
1912 | __func__, -status, | |
1913 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1914 | } | |
1915 | ||
1916 | out: | |
1917 | xprt_clear_connecting(xprt); | |
1918 | xprt_wake_pending_tasks(xprt, status); | |
1919 | } | |
1920 | ||
16be2d20 CL |
1921 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1922 | { | |
1923 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1924 | ||
1925 | if (!transport->inet) { | |
1926 | struct sock *sk = sock->sk; | |
1927 | ||
1928 | write_lock_bh(&sk->sk_callback_lock); | |
1929 | ||
2a9e1cfa TM |
1930 | xs_save_old_callbacks(transport, sk); |
1931 | ||
16be2d20 | 1932 | sk->sk_user_data = xprt; |
16be2d20 CL |
1933 | sk->sk_data_ready = xs_udp_data_ready; |
1934 | sk->sk_write_space = xs_udp_write_space; | |
482f32e6 | 1935 | sk->sk_error_report = xs_error_report; |
16be2d20 CL |
1936 | sk->sk_no_check = UDP_CSUM_NORCV; |
1937 | sk->sk_allocation = GFP_ATOMIC; | |
1938 | ||
1939 | xprt_set_connected(xprt); | |
1940 | ||
1941 | /* Reset to new socket */ | |
1942 | transport->sock = sock; | |
1943 | transport->inet = sk; | |
1944 | ||
1945 | write_unlock_bh(&sk->sk_callback_lock); | |
1946 | } | |
1947 | xs_udp_do_set_buffer_size(xprt); | |
1948 | } | |
1949 | ||
8c14ff2a | 1950 | static void xs_udp_setup_socket(struct work_struct *work) |
a246b010 | 1951 | { |
34161db6 TM |
1952 | struct sock_xprt *transport = |
1953 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1954 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1955 | struct socket *sock = transport->sock; |
b65c0310 | 1956 | int status = -EIO; |
9903cd1c | 1957 | |
01d37c42 | 1958 | if (xprt->shutdown) |
b0d93ad5 | 1959 | goto out; |
9903cd1c | 1960 | |
b0d93ad5 | 1961 | /* Start by resetting any existing state */ |
fe315e76 | 1962 | xs_reset_transport(transport); |
8c14ff2a PE |
1963 | sock = xs_create_sock(xprt, transport, |
1964 | xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); | |
b65c0310 | 1965 | if (IS_ERR(sock)) |
b0d93ad5 | 1966 | goto out; |
68e220bd | 1967 | |
c740eff8 CL |
1968 | dprintk("RPC: worker connecting xprt %p via %s to " |
1969 | "%s (port %s)\n", xprt, | |
1970 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1971 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1972 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
1973 | |
1974 | xs_udp_finish_connecting(xprt, sock); | |
b0d93ad5 CL |
1975 | status = 0; |
1976 | out: | |
b0d93ad5 | 1977 | xprt_clear_connecting(xprt); |
7d1e8255 | 1978 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
1979 | } |
1980 | ||
3167e12c CL |
1981 | /* |
1982 | * We need to preserve the port number so the reply cache on the server can | |
1983 | * find our cached RPC replies when we get around to reconnecting. | |
1984 | */ | |
58dddac9 | 1985 | static void xs_abort_connection(struct sock_xprt *transport) |
3167e12c CL |
1986 | { |
1987 | int result; | |
3167e12c CL |
1988 | struct sockaddr any; |
1989 | ||
58dddac9 | 1990 | dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); |
3167e12c CL |
1991 | |
1992 | /* | |
1993 | * Disconnect the transport socket by doing a connect operation | |
1994 | * with AF_UNSPEC. This should return immediately... | |
1995 | */ | |
1996 | memset(&any, 0, sizeof(any)); | |
1997 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1998 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
7d1e8255 | 1999 | if (!result) |
58dddac9 | 2000 | xs_sock_mark_closed(&transport->xprt); |
7d1e8255 | 2001 | else |
46121cf7 | 2002 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
2003 | result); |
2004 | } | |
2005 | ||
58dddac9 | 2006 | static void xs_tcp_reuse_connection(struct sock_xprt *transport) |
40d2549d TM |
2007 | { |
2008 | unsigned int state = transport->inet->sk_state; | |
2009 | ||
669502ff AC |
2010 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { |
2011 | /* we don't need to abort the connection if the socket | |
2012 | * hasn't undergone a shutdown | |
2013 | */ | |
2014 | if (transport->inet->sk_shutdown == 0) | |
2015 | return; | |
2016 | dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", | |
2017 | __func__, transport->inet->sk_shutdown); | |
2018 | } | |
2019 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { | |
2020 | /* we don't need to abort the connection if the socket | |
2021 | * hasn't undergone a shutdown | |
2022 | */ | |
2023 | if (transport->inet->sk_shutdown == 0) | |
2024 | return; | |
2025 | dprintk("RPC: %s: ESTABLISHED/SYN_SENT " | |
2026 | "sk_shutdown set to %d\n", | |
2027 | __func__, transport->inet->sk_shutdown); | |
2028 | } | |
58dddac9 | 2029 | xs_abort_connection(transport); |
40d2549d TM |
2030 | } |
2031 | ||
16be2d20 | 2032 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 2033 | { |
16be2d20 | 2034 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
fe19a96b | 2035 | int ret = -ENOTCONN; |
edb267a6 | 2036 | |
ee0ac0c2 | 2037 | if (!transport->inet) { |
b0d93ad5 CL |
2038 | struct sock *sk = sock->sk; |
2039 | ||
2040 | write_lock_bh(&sk->sk_callback_lock); | |
2041 | ||
2a9e1cfa TM |
2042 | xs_save_old_callbacks(transport, sk); |
2043 | ||
b0d93ad5 | 2044 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
2045 | sk->sk_data_ready = xs_tcp_data_ready; |
2046 | sk->sk_state_change = xs_tcp_state_change; | |
2047 | sk->sk_write_space = xs_tcp_write_space; | |
482f32e6 | 2048 | sk->sk_error_report = xs_error_report; |
b079fa7b | 2049 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
2050 | |
2051 | /* socket options */ | |
2052 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
2053 | sock_reset_flag(sk, SOCK_LINGER); | |
2054 | tcp_sk(sk)->linger2 = 0; | |
2055 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
2056 | |
2057 | xprt_clear_connected(xprt); | |
2058 | ||
2059 | /* Reset to new socket */ | |
ee0ac0c2 CL |
2060 | transport->sock = sock; |
2061 | transport->inet = sk; | |
b0d93ad5 CL |
2062 | |
2063 | write_unlock_bh(&sk->sk_callback_lock); | |
2064 | } | |
2065 | ||
01d37c42 | 2066 | if (!xprt_bound(xprt)) |
fe19a96b | 2067 | goto out; |
01d37c42 | 2068 | |
b0d93ad5 | 2069 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
2070 | xprt->stat.connect_count++; |
2071 | xprt->stat.connect_start = jiffies; | |
fe19a96b TM |
2072 | ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
2073 | switch (ret) { | |
2074 | case 0: | |
2075 | case -EINPROGRESS: | |
2076 | /* SYN_SENT! */ | |
2077 | xprt->connect_cookie++; | |
2078 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
2079 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2080 | } | |
2081 | out: | |
2082 | return ret; | |
16be2d20 CL |
2083 | } |
2084 | ||
9903cd1c | 2085 | /** |
b61d59ff TM |
2086 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
2087 | * @xprt: RPC transport to connect | |
2088 | * @transport: socket transport to connect | |
2089 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
2090 | * |
2091 | * Invoked by a work queue tasklet. | |
a246b010 | 2092 | */ |
cdd518d5 | 2093 | static void xs_tcp_setup_socket(struct work_struct *work) |
a246b010 | 2094 | { |
cdd518d5 PE |
2095 | struct sock_xprt *transport = |
2096 | container_of(work, struct sock_xprt, connect_worker.work); | |
ee0ac0c2 | 2097 | struct socket *sock = transport->sock; |
a9f5f0f7 | 2098 | struct rpc_xprt *xprt = &transport->xprt; |
b61d59ff | 2099 | int status = -EIO; |
a246b010 | 2100 | |
01d37c42 | 2101 | if (xprt->shutdown) |
a246b010 CL |
2102 | goto out; |
2103 | ||
ee0ac0c2 | 2104 | if (!sock) { |
7d1e8255 | 2105 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
cdd518d5 PE |
2106 | sock = xs_create_sock(xprt, transport, |
2107 | xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); | |
b61d59ff TM |
2108 | if (IS_ERR(sock)) { |
2109 | status = PTR_ERR(sock); | |
3167e12c CL |
2110 | goto out; |
2111 | } | |
7d1e8255 TM |
2112 | } else { |
2113 | int abort_and_exit; | |
a246b010 | 2114 | |
7d1e8255 TM |
2115 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
2116 | &xprt->state); | |
3167e12c | 2117 | /* "close" the socket, preserving the local port */ |
58dddac9 | 2118 | xs_tcp_reuse_connection(transport); |
a246b010 | 2119 | |
7d1e8255 TM |
2120 | if (abort_and_exit) |
2121 | goto out_eagain; | |
2122 | } | |
a246b010 | 2123 | |
c740eff8 CL |
2124 | dprintk("RPC: worker connecting xprt %p via %s to " |
2125 | "%s (port %s)\n", xprt, | |
2126 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2127 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2128 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 2129 | |
16be2d20 | 2130 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 CL |
2131 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
2132 | xprt, -status, xprt_connected(xprt), | |
2133 | sock->sk->sk_state); | |
2a491991 | 2134 | switch (status) { |
f75e6745 TM |
2135 | default: |
2136 | printk("%s: connect returned unhandled error %d\n", | |
2137 | __func__, status); | |
2138 | case -EADDRNOTAVAIL: | |
2139 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
2140 | * and retry | |
2141 | */ | |
2142 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
2143 | xprt_force_disconnect(xprt); | |
88b5ed73 | 2144 | break; |
8a2cec29 TM |
2145 | case -ECONNREFUSED: |
2146 | case -ECONNRESET: | |
2147 | case -ENETUNREACH: | |
2148 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
2149 | case 0: |
2150 | case -EINPROGRESS: | |
2151 | case -EALREADY: | |
7d1e8255 TM |
2152 | xprt_clear_connecting(xprt); |
2153 | return; | |
9fcfe0c8 TM |
2154 | case -EINVAL: |
2155 | /* Happens, for instance, if the user specified a link | |
2156 | * local IPv6 address without a scope-id. | |
2157 | */ | |
2158 | goto out; | |
a246b010 | 2159 | } |
7d1e8255 | 2160 | out_eagain: |
2a491991 | 2161 | status = -EAGAIN; |
a246b010 | 2162 | out: |
68e220bd | 2163 | xprt_clear_connecting(xprt); |
7d1e8255 | 2164 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 2165 | } |
b0d93ad5 | 2166 | |
9903cd1c CL |
2167 | /** |
2168 | * xs_connect - connect a socket to a remote endpoint | |
2169 | * @task: address of RPC task that manages state of connect request | |
2170 | * | |
2171 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2172 | * |
2173 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2174 | * to guarantee that even unprivileged user processes can set up a | |
2175 | * socket on a privileged port. | |
2176 | * | |
2177 | * If a UDP socket connect fails, the delay behavior here prevents | |
2178 | * retry floods (hard mounts). | |
9903cd1c CL |
2179 | */ |
2180 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
2181 | { |
2182 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 2183 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2184 | |
09a21c41 | 2185 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
46121cf7 CL |
2186 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2187 | "seconds\n", | |
03bf4b70 | 2188 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2189 | queue_delayed_work(rpciod_workqueue, |
2190 | &transport->connect_worker, | |
2191 | xprt->reestablish_timeout); | |
03bf4b70 | 2192 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2193 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2194 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2195 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2196 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2197 | } else { |
46121cf7 | 2198 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2199 | queue_delayed_work(rpciod_workqueue, |
2200 | &transport->connect_worker, 0); | |
a246b010 CL |
2201 | } |
2202 | } | |
2203 | ||
176e21ee CL |
2204 | /** |
2205 | * xs_local_print_stats - display AF_LOCAL socket-specifc stats | |
2206 | * @xprt: rpc_xprt struct containing statistics | |
2207 | * @seq: output file | |
2208 | * | |
2209 | */ | |
2210 | static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2211 | { | |
2212 | long idle_time = 0; | |
2213 | ||
2214 | if (xprt_connected(xprt)) | |
2215 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2216 | ||
2217 | seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " | |
2218 | "%llu %llu\n", | |
2219 | xprt->stat.bind_count, | |
2220 | xprt->stat.connect_count, | |
2221 | xprt->stat.connect_time, | |
2222 | idle_time, | |
2223 | xprt->stat.sends, | |
2224 | xprt->stat.recvs, | |
2225 | xprt->stat.bad_xids, | |
2226 | xprt->stat.req_u, | |
2227 | xprt->stat.bklog_u); | |
2228 | } | |
2229 | ||
262ca07d CL |
2230 | /** |
2231 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2232 | * @xprt: rpc_xprt struct containing statistics | |
2233 | * @seq: output file | |
2234 | * | |
2235 | */ | |
2236 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2237 | { | |
c8475461 CL |
2238 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2239 | ||
262ca07d | 2240 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
fbfffbd5 | 2241 | transport->srcport, |
262ca07d CL |
2242 | xprt->stat.bind_count, |
2243 | xprt->stat.sends, | |
2244 | xprt->stat.recvs, | |
2245 | xprt->stat.bad_xids, | |
2246 | xprt->stat.req_u, | |
2247 | xprt->stat.bklog_u); | |
2248 | } | |
2249 | ||
2250 | /** | |
2251 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2252 | * @xprt: rpc_xprt struct containing statistics | |
2253 | * @seq: output file | |
2254 | * | |
2255 | */ | |
2256 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2257 | { | |
c8475461 | 2258 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2259 | long idle_time = 0; |
2260 | ||
2261 | if (xprt_connected(xprt)) | |
2262 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2263 | ||
2264 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
fbfffbd5 | 2265 | transport->srcport, |
262ca07d CL |
2266 | xprt->stat.bind_count, |
2267 | xprt->stat.connect_count, | |
2268 | xprt->stat.connect_time, | |
2269 | idle_time, | |
2270 | xprt->stat.sends, | |
2271 | xprt->stat.recvs, | |
2272 | xprt->stat.bad_xids, | |
2273 | xprt->stat.req_u, | |
2274 | xprt->stat.bklog_u); | |
2275 | } | |
2276 | ||
4cfc7e60 RI |
2277 | /* |
2278 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2279 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2280 | * to use the server side send routines. | |
2281 | */ | |
5a51f13a | 2282 | static void *bc_malloc(struct rpc_task *task, size_t size) |
4cfc7e60 RI |
2283 | { |
2284 | struct page *page; | |
2285 | struct rpc_buffer *buf; | |
2286 | ||
2287 | BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); | |
2288 | page = alloc_page(GFP_KERNEL); | |
2289 | ||
2290 | if (!page) | |
2291 | return NULL; | |
2292 | ||
2293 | buf = page_address(page); | |
2294 | buf->len = PAGE_SIZE; | |
2295 | ||
2296 | return buf->data; | |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * Free the space allocated in the bc_alloc routine | |
2301 | */ | |
5a51f13a | 2302 | static void bc_free(void *buffer) |
4cfc7e60 RI |
2303 | { |
2304 | struct rpc_buffer *buf; | |
2305 | ||
2306 | if (!buffer) | |
2307 | return; | |
2308 | ||
2309 | buf = container_of(buffer, struct rpc_buffer, data); | |
2310 | free_page((unsigned long)buf); | |
2311 | } | |
2312 | ||
2313 | /* | |
2314 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2315 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2316 | */ | |
2317 | static int bc_sendto(struct rpc_rqst *req) | |
2318 | { | |
2319 | int len; | |
2320 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2321 | struct rpc_xprt *xprt = req->rq_xprt; | |
2322 | struct sock_xprt *transport = | |
2323 | container_of(xprt, struct sock_xprt, xprt); | |
2324 | struct socket *sock = transport->sock; | |
2325 | unsigned long headoff; | |
2326 | unsigned long tailoff; | |
2327 | ||
61677eee | 2328 | xs_encode_stream_record_marker(xbufp); |
4cfc7e60 RI |
2329 | |
2330 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2331 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2332 | len = svc_send_common(sock, xbufp, | |
2333 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2334 | xbufp->tail[0].iov_base, tailoff); | |
2335 | ||
2336 | if (len != xbufp->len) { | |
2337 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2338 | len = -EAGAIN; | |
2339 | } | |
2340 | ||
2341 | return len; | |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * The send routine. Borrows from svc_send | |
2346 | */ | |
2347 | static int bc_send_request(struct rpc_task *task) | |
2348 | { | |
2349 | struct rpc_rqst *req = task->tk_rqstp; | |
2350 | struct svc_xprt *xprt; | |
2351 | struct svc_sock *svsk; | |
2352 | u32 len; | |
2353 | ||
2354 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2355 | /* | |
2356 | * Get the server socket associated with this callback xprt | |
2357 | */ | |
2358 | xprt = req->rq_xprt->bc_xprt; | |
2359 | svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
2360 | ||
2361 | /* | |
2362 | * Grab the mutex to serialize data as the connection is shared | |
2363 | * with the fore channel | |
2364 | */ | |
2365 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2366 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2367 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2368 | return -EAGAIN; | |
2369 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2370 | } | |
2371 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2372 | len = -ENOTCONN; | |
2373 | else | |
2374 | len = bc_sendto(req); | |
2375 | mutex_unlock(&xprt->xpt_mutex); | |
2376 | ||
2377 | if (len > 0) | |
2378 | len = 0; | |
2379 | ||
2380 | return len; | |
2381 | } | |
2382 | ||
2383 | /* | |
2384 | * The close routine. Since this is client initiated, we do nothing | |
2385 | */ | |
2386 | ||
2387 | static void bc_close(struct rpc_xprt *xprt) | |
2388 | { | |
4cfc7e60 RI |
2389 | } |
2390 | ||
2391 | /* | |
2392 | * The xprt destroy routine. Again, because this connection is client | |
2393 | * initiated, we do nothing | |
2394 | */ | |
2395 | ||
2396 | static void bc_destroy(struct rpc_xprt *xprt) | |
2397 | { | |
4cfc7e60 RI |
2398 | } |
2399 | ||
176e21ee CL |
2400 | static struct rpc_xprt_ops xs_local_ops = { |
2401 | .reserve_xprt = xprt_reserve_xprt, | |
2402 | .release_xprt = xs_tcp_release_xprt, | |
2403 | .rpcbind = xs_local_rpcbind, | |
2404 | .set_port = xs_local_set_port, | |
2405 | .connect = xs_connect, | |
2406 | .buf_alloc = rpc_malloc, | |
2407 | .buf_free = rpc_free, | |
2408 | .send_request = xs_local_send_request, | |
2409 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2410 | .close = xs_close, | |
2411 | .destroy = xs_destroy, | |
2412 | .print_stats = xs_local_print_stats, | |
2413 | }; | |
2414 | ||
262965f5 | 2415 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2416 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2417 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2418 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 2419 | .rpcbind = rpcb_getport_async, |
92200412 | 2420 | .set_port = xs_set_port, |
262965f5 | 2421 | .connect = xs_connect, |
02107148 CL |
2422 | .buf_alloc = rpc_malloc, |
2423 | .buf_free = rpc_free, | |
262965f5 | 2424 | .send_request = xs_udp_send_request, |
fe3aca29 | 2425 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2426 | .timer = xs_udp_timer, |
a58dd398 | 2427 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2428 | .close = xs_close, |
2429 | .destroy = xs_destroy, | |
262ca07d | 2430 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2431 | }; |
2432 | ||
2433 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2434 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2435 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 2436 | .rpcbind = rpcb_getport_async, |
92200412 | 2437 | .set_port = xs_set_port, |
0b9e7943 | 2438 | .connect = xs_connect, |
02107148 CL |
2439 | .buf_alloc = rpc_malloc, |
2440 | .buf_free = rpc_free, | |
262965f5 | 2441 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2442 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
f75e6745 | 2443 | .close = xs_tcp_close, |
9903cd1c | 2444 | .destroy = xs_destroy, |
262ca07d | 2445 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2446 | }; |
2447 | ||
4cfc7e60 RI |
2448 | /* |
2449 | * The rpc_xprt_ops for the server backchannel | |
2450 | */ | |
2451 | ||
2452 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2453 | .reserve_xprt = xprt_reserve_xprt, | |
2454 | .release_xprt = xprt_release_xprt, | |
2455 | .buf_alloc = bc_malloc, | |
2456 | .buf_free = bc_free, | |
2457 | .send_request = bc_send_request, | |
2458 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2459 | .close = bc_close, | |
2460 | .destroy = bc_destroy, | |
2461 | .print_stats = xs_tcp_print_stats, | |
2462 | }; | |
2463 | ||
92476850 CL |
2464 | static int xs_init_anyaddr(const int family, struct sockaddr *sap) |
2465 | { | |
2466 | static const struct sockaddr_in sin = { | |
2467 | .sin_family = AF_INET, | |
2468 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
2469 | }; | |
2470 | static const struct sockaddr_in6 sin6 = { | |
2471 | .sin6_family = AF_INET6, | |
2472 | .sin6_addr = IN6ADDR_ANY_INIT, | |
2473 | }; | |
2474 | ||
2475 | switch (family) { | |
176e21ee CL |
2476 | case AF_LOCAL: |
2477 | break; | |
92476850 CL |
2478 | case AF_INET: |
2479 | memcpy(sap, &sin, sizeof(sin)); | |
2480 | break; | |
2481 | case AF_INET6: | |
2482 | memcpy(sap, &sin6, sizeof(sin6)); | |
2483 | break; | |
2484 | default: | |
2485 | dprintk("RPC: %s: Bad address family\n", __func__); | |
2486 | return -EAFNOSUPPORT; | |
2487 | } | |
2488 | return 0; | |
2489 | } | |
2490 | ||
3c341b0b | 2491 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
bc25571e | 2492 | unsigned int slot_table_size) |
c8541ecd CL |
2493 | { |
2494 | struct rpc_xprt *xprt; | |
ffc2e518 | 2495 | struct sock_xprt *new; |
c8541ecd | 2496 | |
96802a09 | 2497 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2498 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2499 | return ERR_PTR(-EBADF); |
2500 | } | |
2501 | ||
37aa2133 | 2502 | xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size); |
bd1722d4 | 2503 | if (xprt == NULL) { |
46121cf7 CL |
2504 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2505 | "rpc_xprt\n"); | |
c8541ecd CL |
2506 | return ERR_PTR(-ENOMEM); |
2507 | } | |
c8541ecd | 2508 | |
bd1722d4 | 2509 | new = container_of(xprt, struct sock_xprt, xprt); |
96802a09 FM |
2510 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2511 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2512 | if (args->srcaddr) |
fbfffbd5 | 2513 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
92476850 CL |
2514 | else { |
2515 | int err; | |
2516 | err = xs_init_anyaddr(args->dstaddr->sa_family, | |
2517 | (struct sockaddr *)&new->srcaddr); | |
2518 | if (err != 0) | |
2519 | return ERR_PTR(err); | |
2520 | } | |
c8541ecd CL |
2521 | |
2522 | return xprt; | |
2523 | } | |
2524 | ||
176e21ee CL |
2525 | static const struct rpc_timeout xs_local_default_timeout = { |
2526 | .to_initval = 10 * HZ, | |
2527 | .to_maxval = 10 * HZ, | |
2528 | .to_retries = 2, | |
2529 | }; | |
2530 | ||
2531 | /** | |
2532 | * xs_setup_local - Set up transport to use an AF_LOCAL socket | |
2533 | * @args: rpc transport creation arguments | |
2534 | * | |
2535 | * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP | |
2536 | */ | |
2537 | static struct rpc_xprt *xs_setup_local(struct xprt_create *args) | |
2538 | { | |
2539 | struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; | |
2540 | struct sock_xprt *transport; | |
2541 | struct rpc_xprt *xprt; | |
2542 | struct rpc_xprt *ret; | |
2543 | ||
2544 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); | |
2545 | if (IS_ERR(xprt)) | |
2546 | return xprt; | |
2547 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2548 | ||
2549 | xprt->prot = 0; | |
2550 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2551 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2552 | ||
2553 | xprt->bind_timeout = XS_BIND_TO; | |
2554 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2555 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
2556 | ||
2557 | xprt->ops = &xs_local_ops; | |
2558 | xprt->timeout = &xs_local_default_timeout; | |
2559 | ||
2560 | switch (sun->sun_family) { | |
2561 | case AF_LOCAL: | |
2562 | if (sun->sun_path[0] != '/') { | |
2563 | dprintk("RPC: bad AF_LOCAL address: %s\n", | |
2564 | sun->sun_path); | |
2565 | ret = ERR_PTR(-EINVAL); | |
2566 | goto out_err; | |
2567 | } | |
2568 | xprt_set_bound(xprt); | |
2569 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2570 | xs_local_setup_socket); | |
2571 | xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); | |
2572 | break; | |
2573 | default: | |
2574 | ret = ERR_PTR(-EAFNOSUPPORT); | |
2575 | goto out_err; | |
2576 | } | |
2577 | ||
2578 | dprintk("RPC: set up xprt to %s via AF_LOCAL\n", | |
2579 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2580 | ||
2581 | if (try_module_get(THIS_MODULE)) | |
2582 | return xprt; | |
2583 | ret = ERR_PTR(-EINVAL); | |
2584 | out_err: | |
2585 | xprt_free(xprt); | |
2586 | return ret; | |
2587 | } | |
2588 | ||
2881ae74 TM |
2589 | static const struct rpc_timeout xs_udp_default_timeout = { |
2590 | .to_initval = 5 * HZ, | |
2591 | .to_maxval = 30 * HZ, | |
2592 | .to_increment = 5 * HZ, | |
2593 | .to_retries = 5, | |
2594 | }; | |
2595 | ||
9903cd1c CL |
2596 | /** |
2597 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2598 | * @args: rpc transport creation arguments |
9903cd1c CL |
2599 | * |
2600 | */ | |
483066d6 | 2601 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2602 | { |
8f9d5b1a | 2603 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2604 | struct rpc_xprt *xprt; |
c8475461 | 2605 | struct sock_xprt *transport; |
0a68b0be | 2606 | struct rpc_xprt *ret; |
a246b010 | 2607 | |
96802a09 | 2608 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
2609 | if (IS_ERR(xprt)) |
2610 | return xprt; | |
c8475461 | 2611 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2612 | |
ec739ef0 | 2613 | xprt->prot = IPPROTO_UDP; |
808012fb | 2614 | xprt->tsh_size = 0; |
a246b010 CL |
2615 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2616 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2617 | ||
03bf4b70 | 2618 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2619 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2620 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2621 | |
262965f5 | 2622 | xprt->ops = &xs_udp_ops; |
a246b010 | 2623 | |
ba7392bb | 2624 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2625 | |
8f9d5b1a CL |
2626 | switch (addr->sa_family) { |
2627 | case AF_INET: | |
2628 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2629 | xprt_set_bound(xprt); | |
2630 | ||
2631 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2632 | xs_udp_setup_socket); |
9dc3b095 | 2633 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2634 | break; |
2635 | case AF_INET6: | |
2636 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2637 | xprt_set_bound(xprt); | |
2638 | ||
2639 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2640 | xs_udp_setup_socket); |
9dc3b095 | 2641 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2642 | break; |
2643 | default: | |
0a68b0be BF |
2644 | ret = ERR_PTR(-EAFNOSUPPORT); |
2645 | goto out_err; | |
8f9d5b1a CL |
2646 | } |
2647 | ||
c740eff8 CL |
2648 | if (xprt_bound(xprt)) |
2649 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2650 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2651 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2652 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2653 | else | |
2654 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2655 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2656 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2657 | |
bc25571e TT |
2658 | if (try_module_get(THIS_MODULE)) |
2659 | return xprt; | |
0a68b0be BF |
2660 | ret = ERR_PTR(-EINVAL); |
2661 | out_err: | |
e204e621 | 2662 | xprt_free(xprt); |
0a68b0be | 2663 | return ret; |
a246b010 CL |
2664 | } |
2665 | ||
2881ae74 TM |
2666 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2667 | .to_initval = 60 * HZ, | |
2668 | .to_maxval = 60 * HZ, | |
2669 | .to_retries = 2, | |
2670 | }; | |
2671 | ||
9903cd1c CL |
2672 | /** |
2673 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2674 | * @args: rpc transport creation arguments |
9903cd1c CL |
2675 | * |
2676 | */ | |
483066d6 | 2677 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2678 | { |
8f9d5b1a | 2679 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2680 | struct rpc_xprt *xprt; |
c8475461 | 2681 | struct sock_xprt *transport; |
0a68b0be | 2682 | struct rpc_xprt *ret; |
a246b010 | 2683 | |
96802a09 | 2684 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
2685 | if (IS_ERR(xprt)) |
2686 | return xprt; | |
c8475461 | 2687 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2688 | |
ec739ef0 | 2689 | xprt->prot = IPPROTO_TCP; |
808012fb | 2690 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2691 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2692 | |
03bf4b70 | 2693 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2694 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2695 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2696 | |
262965f5 | 2697 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2698 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2699 | |
8f9d5b1a CL |
2700 | switch (addr->sa_family) { |
2701 | case AF_INET: | |
2702 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2703 | xprt_set_bound(xprt); | |
2704 | ||
9dc3b095 | 2705 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2706 | xs_tcp_setup_socket); |
9dc3b095 | 2707 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2708 | break; |
2709 | case AF_INET6: | |
2710 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2711 | xprt_set_bound(xprt); | |
2712 | ||
9dc3b095 | 2713 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2714 | xs_tcp_setup_socket); |
9dc3b095 | 2715 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2716 | break; |
2717 | default: | |
0a68b0be BF |
2718 | ret = ERR_PTR(-EAFNOSUPPORT); |
2719 | goto out_err; | |
8f9d5b1a CL |
2720 | } |
2721 | ||
c740eff8 CL |
2722 | if (xprt_bound(xprt)) |
2723 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2724 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2725 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2726 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2727 | else | |
2728 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2729 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2730 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2731 | ||
edb267a6 | 2732 | |
bc25571e TT |
2733 | if (try_module_get(THIS_MODULE)) |
2734 | return xprt; | |
0a68b0be BF |
2735 | ret = ERR_PTR(-EINVAL); |
2736 | out_err: | |
e204e621 | 2737 | xprt_free(xprt); |
0a68b0be | 2738 | return ret; |
a246b010 | 2739 | } |
282b32e1 | 2740 | |
f300baba AB |
2741 | /** |
2742 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2743 | * @args: rpc transport creation arguments | |
2744 | * | |
2745 | */ | |
2746 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2747 | { | |
2748 | struct sockaddr *addr = args->dstaddr; | |
2749 | struct rpc_xprt *xprt; | |
2750 | struct sock_xprt *transport; | |
2751 | struct svc_sock *bc_sock; | |
0a68b0be | 2752 | struct rpc_xprt *ret; |
f300baba | 2753 | |
f0418aa4 BF |
2754 | if (args->bc_xprt->xpt_bc_xprt) { |
2755 | /* | |
2756 | * This server connection already has a backchannel | |
2757 | * export; we can't create a new one, as we wouldn't be | |
2758 | * able to match replies based on xid any more. So, | |
2759 | * reuse the already-existing one: | |
2760 | */ | |
2761 | return args->bc_xprt->xpt_bc_xprt; | |
2762 | } | |
f300baba AB |
2763 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
2764 | if (IS_ERR(xprt)) | |
2765 | return xprt; | |
2766 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2767 | ||
2768 | xprt->prot = IPPROTO_TCP; | |
2769 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2770 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2771 | xprt->timeout = &xs_tcp_default_timeout; | |
2772 | ||
2773 | /* backchannel */ | |
2774 | xprt_set_bound(xprt); | |
2775 | xprt->bind_timeout = 0; | |
f300baba AB |
2776 | xprt->reestablish_timeout = 0; |
2777 | xprt->idle_timeout = 0; | |
2778 | ||
f300baba AB |
2779 | xprt->ops = &bc_tcp_ops; |
2780 | ||
2781 | switch (addr->sa_family) { | |
2782 | case AF_INET: | |
2783 | xs_format_peer_addresses(xprt, "tcp", | |
2784 | RPCBIND_NETID_TCP); | |
2785 | break; | |
2786 | case AF_INET6: | |
2787 | xs_format_peer_addresses(xprt, "tcp", | |
2788 | RPCBIND_NETID_TCP6); | |
2789 | break; | |
2790 | default: | |
0a68b0be BF |
2791 | ret = ERR_PTR(-EAFNOSUPPORT); |
2792 | goto out_err; | |
f300baba AB |
2793 | } |
2794 | ||
50fa0d40 PE |
2795 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2796 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2797 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2798 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
f300baba | 2799 | |
99de8ea9 BF |
2800 | /* |
2801 | * Once we've associated a backchannel xprt with a connection, | |
2802 | * we want to keep it around as long as long as the connection | |
2803 | * lasts, in case we need to start using it for a backchannel | |
2804 | * again; this reference won't be dropped until bc_xprt is | |
2805 | * destroyed. | |
2806 | */ | |
2807 | xprt_get(xprt); | |
2808 | args->bc_xprt->xpt_bc_xprt = xprt; | |
2809 | xprt->bc_xprt = args->bc_xprt; | |
2810 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
2811 | transport->sock = bc_sock->sk_sock; | |
2812 | transport->inet = bc_sock->sk_sk; | |
2813 | ||
f300baba AB |
2814 | /* |
2815 | * Since we don't want connections for the backchannel, we set | |
2816 | * the xprt status to connected | |
2817 | */ | |
2818 | xprt_set_connected(xprt); | |
2819 | ||
2820 | ||
2821 | if (try_module_get(THIS_MODULE)) | |
2822 | return xprt; | |
99de8ea9 | 2823 | xprt_put(xprt); |
0a68b0be BF |
2824 | ret = ERR_PTR(-EINVAL); |
2825 | out_err: | |
e204e621 | 2826 | xprt_free(xprt); |
0a68b0be | 2827 | return ret; |
f300baba AB |
2828 | } |
2829 | ||
176e21ee CL |
2830 | static struct xprt_class xs_local_transport = { |
2831 | .list = LIST_HEAD_INIT(xs_local_transport.list), | |
2832 | .name = "named UNIX socket", | |
2833 | .owner = THIS_MODULE, | |
2834 | .ident = XPRT_TRANSPORT_LOCAL, | |
2835 | .setup = xs_setup_local, | |
2836 | }; | |
2837 | ||
bc25571e TT |
2838 | static struct xprt_class xs_udp_transport = { |
2839 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2840 | .name = "udp", | |
2841 | .owner = THIS_MODULE, | |
f300baba | 2842 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
2843 | .setup = xs_setup_udp, |
2844 | }; | |
2845 | ||
2846 | static struct xprt_class xs_tcp_transport = { | |
2847 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2848 | .name = "tcp", | |
2849 | .owner = THIS_MODULE, | |
f300baba | 2850 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
2851 | .setup = xs_setup_tcp, |
2852 | }; | |
2853 | ||
f300baba AB |
2854 | static struct xprt_class xs_bc_tcp_transport = { |
2855 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
2856 | .name = "tcp NFSv4.1 backchannel", | |
2857 | .owner = THIS_MODULE, | |
2858 | .ident = XPRT_TRANSPORT_BC_TCP, | |
2859 | .setup = xs_setup_bc_tcp, | |
2860 | }; | |
2861 | ||
282b32e1 | 2862 | /** |
bc25571e | 2863 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2864 | * |
2865 | */ | |
2866 | int init_socket_xprt(void) | |
2867 | { | |
fbf76683 | 2868 | #ifdef RPC_DEBUG |
2b1bec5f | 2869 | if (!sunrpc_table_header) |
0b4d4147 | 2870 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2871 | #endif |
2872 | ||
176e21ee | 2873 | xprt_register_transport(&xs_local_transport); |
bc25571e TT |
2874 | xprt_register_transport(&xs_udp_transport); |
2875 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 2876 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 2877 | |
282b32e1 CL |
2878 | return 0; |
2879 | } | |
2880 | ||
2881 | /** | |
bc25571e | 2882 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2883 | * |
2884 | */ | |
2885 | void cleanup_socket_xprt(void) | |
2886 | { | |
fbf76683 CL |
2887 | #ifdef RPC_DEBUG |
2888 | if (sunrpc_table_header) { | |
2889 | unregister_sysctl_table(sunrpc_table_header); | |
2890 | sunrpc_table_header = NULL; | |
2891 | } | |
2892 | #endif | |
bc25571e | 2893 | |
176e21ee | 2894 | xprt_unregister_transport(&xs_local_transport); |
bc25571e TT |
2895 | xprt_unregister_transport(&xs_udp_transport); |
2896 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 2897 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 2898 | } |
cbf11071 | 2899 | |
9bbb9e5a RR |
2900 | static int param_set_uint_minmax(const char *val, |
2901 | const struct kernel_param *kp, | |
cbf11071 TM |
2902 | unsigned int min, unsigned int max) |
2903 | { | |
2904 | unsigned long num; | |
2905 | int ret; | |
2906 | ||
2907 | if (!val) | |
2908 | return -EINVAL; | |
2909 | ret = strict_strtoul(val, 0, &num); | |
2910 | if (ret == -EINVAL || num < min || num > max) | |
2911 | return -EINVAL; | |
2912 | *((unsigned int *)kp->arg) = num; | |
2913 | return 0; | |
2914 | } | |
2915 | ||
9bbb9e5a | 2916 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
cbf11071 TM |
2917 | { |
2918 | return param_set_uint_minmax(val, kp, | |
2919 | RPC_MIN_RESVPORT, | |
2920 | RPC_MAX_RESVPORT); | |
2921 | } | |
2922 | ||
9bbb9e5a RR |
2923 | static struct kernel_param_ops param_ops_portnr = { |
2924 | .set = param_set_portnr, | |
2925 | .get = param_get_uint, | |
2926 | }; | |
2927 | ||
cbf11071 TM |
2928 | #define param_check_portnr(name, p) \ |
2929 | __param_check(name, p, unsigned int); | |
2930 | ||
2931 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
2932 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
2933 | ||
9bbb9e5a RR |
2934 | static int param_set_slot_table_size(const char *val, |
2935 | const struct kernel_param *kp) | |
cbf11071 TM |
2936 | { |
2937 | return param_set_uint_minmax(val, kp, | |
2938 | RPC_MIN_SLOT_TABLE, | |
2939 | RPC_MAX_SLOT_TABLE); | |
2940 | } | |
2941 | ||
9bbb9e5a RR |
2942 | static struct kernel_param_ops param_ops_slot_table_size = { |
2943 | .set = param_set_slot_table_size, | |
2944 | .get = param_get_uint, | |
2945 | }; | |
2946 | ||
cbf11071 TM |
2947 | #define param_check_slot_table_size(name, p) \ |
2948 | __param_check(name, p, unsigned int); | |
2949 | ||
2950 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, | |
2951 | slot_table_size, 0644); | |
2952 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, | |
2953 | slot_table_size, 0644); | |
2954 |