Commit | Line | Data |
---|---|---|
a246b010 CL |
1 | /* |
2 | * linux/net/sunrpc/xprtsock.c | |
3 | * | |
4 | * Client-side transport implementation for sockets. | |
5 | * | |
113aa838 AC |
6 | * TCP callback races fixes (C) 1998 Red Hat |
7 | * TCP send fixes (C) 1998 Red Hat | |
a246b010 CL |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> | |
10 | * | |
11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. | |
12 | * Fix behaviour when socket buffer is full. | |
13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/slab.h> | |
bc25571e | 23 | #include <linux/module.h> |
a246b010 | 24 | #include <linux/capability.h> |
a246b010 CL |
25 | #include <linux/pagemap.h> |
26 | #include <linux/errno.h> | |
27 | #include <linux/socket.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/net.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/udp.h> | |
32 | #include <linux/tcp.h> | |
33 | #include <linux/sunrpc/clnt.h> | |
02107148 | 34 | #include <linux/sunrpc/sched.h> |
4cfc7e60 | 35 | #include <linux/sunrpc/svcsock.h> |
49c36fcc | 36 | #include <linux/sunrpc/xprtsock.h> |
a246b010 | 37 | #include <linux/file.h> |
44b98efd RL |
38 | #ifdef CONFIG_NFS_V4_1 |
39 | #include <linux/sunrpc/bc_xprt.h> | |
40 | #endif | |
a246b010 CL |
41 | |
42 | #include <net/sock.h> | |
43 | #include <net/checksum.h> | |
44 | #include <net/udp.h> | |
45 | #include <net/tcp.h> | |
46 | ||
4cfc7e60 | 47 | #include "sunrpc.h" |
c556b754 CL |
48 | /* |
49 | * xprtsock tunables | |
50 | */ | |
51 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
52 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
53 | ||
54 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
55 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
56 | ||
7d1e8255 | 57 | #define XS_TCP_LINGER_TO (15U * HZ) |
25fe6142 | 58 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
7d1e8255 | 59 | |
fbf76683 CL |
60 | /* |
61 | * We can register our own files under /proc/sys/sunrpc by | |
62 | * calling register_sysctl_table() again. The files in that | |
63 | * directory become the union of all files registered there. | |
64 | * | |
65 | * We simply need to make sure that we don't collide with | |
66 | * someone else's file names! | |
67 | */ | |
68 | ||
69 | #ifdef RPC_DEBUG | |
70 | ||
71 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
72 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
73 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; | |
74 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
75 | ||
76 | static struct ctl_table_header *sunrpc_table_header; | |
77 | ||
78 | /* | |
79 | * FIXME: changing the UDP slot table size should also resize the UDP | |
80 | * socket buffers for existing UDP transports | |
81 | */ | |
82 | static ctl_table xs_tunables_table[] = { | |
83 | { | |
fbf76683 CL |
84 | .procname = "udp_slot_table_entries", |
85 | .data = &xprt_udp_slot_table_entries, | |
86 | .maxlen = sizeof(unsigned int), | |
87 | .mode = 0644, | |
6d456111 | 88 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
89 | .extra1 = &min_slot_table_size, |
90 | .extra2 = &max_slot_table_size | |
91 | }, | |
92 | { | |
fbf76683 CL |
93 | .procname = "tcp_slot_table_entries", |
94 | .data = &xprt_tcp_slot_table_entries, | |
95 | .maxlen = sizeof(unsigned int), | |
96 | .mode = 0644, | |
6d456111 | 97 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
98 | .extra1 = &min_slot_table_size, |
99 | .extra2 = &max_slot_table_size | |
100 | }, | |
101 | { | |
fbf76683 CL |
102 | .procname = "min_resvport", |
103 | .data = &xprt_min_resvport, | |
104 | .maxlen = sizeof(unsigned int), | |
105 | .mode = 0644, | |
6d456111 | 106 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
107 | .extra1 = &xprt_min_resvport_limit, |
108 | .extra2 = &xprt_max_resvport_limit | |
109 | }, | |
110 | { | |
fbf76683 CL |
111 | .procname = "max_resvport", |
112 | .data = &xprt_max_resvport, | |
113 | .maxlen = sizeof(unsigned int), | |
114 | .mode = 0644, | |
6d456111 | 115 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
116 | .extra1 = &xprt_min_resvport_limit, |
117 | .extra2 = &xprt_max_resvport_limit | |
118 | }, | |
25fe6142 TM |
119 | { |
120 | .procname = "tcp_fin_timeout", | |
121 | .data = &xs_tcp_fin_timeout, | |
122 | .maxlen = sizeof(xs_tcp_fin_timeout), | |
123 | .mode = 0644, | |
6d456111 | 124 | .proc_handler = proc_dointvec_jiffies, |
fbf76683 | 125 | }, |
f8572d8f | 126 | { }, |
fbf76683 CL |
127 | }; |
128 | ||
129 | static ctl_table sunrpc_table[] = { | |
130 | { | |
fbf76683 CL |
131 | .procname = "sunrpc", |
132 | .mode = 0555, | |
133 | .child = xs_tunables_table | |
134 | }, | |
f8572d8f | 135 | { }, |
fbf76683 CL |
136 | }; |
137 | ||
138 | #endif | |
139 | ||
03bf4b70 CL |
140 | /* |
141 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
142 | * synchronous, but we set a timeout anyway in case of resource | |
143 | * exhaustion on the local host. | |
144 | */ | |
145 | #define XS_UDP_CONN_TO (5U * HZ) | |
146 | ||
147 | /* | |
148 | * Wait duration for an RPC TCP connection to be established. Solaris | |
149 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
150 | * long a server takes to reboot. | |
151 | */ | |
152 | #define XS_TCP_CONN_TO (60U * HZ) | |
153 | ||
154 | /* | |
155 | * Wait duration for a reply from the RPC portmapper. | |
156 | */ | |
157 | #define XS_BIND_TO (60U * HZ) | |
158 | ||
159 | /* | |
160 | * Delay if a UDP socket connect error occurs. This is most likely some | |
161 | * kind of resource problem on the local host. | |
162 | */ | |
163 | #define XS_UDP_REEST_TO (2U * HZ) | |
164 | ||
165 | /* | |
166 | * The reestablish timeout allows clients to delay for a bit before attempting | |
167 | * to reconnect to a server that just dropped our connection. | |
168 | * | |
169 | * We implement an exponential backoff when trying to reestablish a TCP | |
170 | * transport connection with the server. Some servers like to drop a TCP | |
171 | * connection when they are overworked, so we start with a short timeout and | |
172 | * increase over time if the server is down or not responding. | |
173 | */ | |
174 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
175 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
176 | ||
177 | /* | |
178 | * TCP idle timeout; client drops the transport socket if it is idle | |
179 | * for this long. Note that we also timeout UDP sockets to prevent | |
180 | * holding port numbers when there is no RPC traffic. | |
181 | */ | |
182 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
183 | ||
a246b010 CL |
184 | #ifdef RPC_DEBUG |
185 | # undef RPC_DEBUG_DATA | |
9903cd1c | 186 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
187 | #endif |
188 | ||
a246b010 | 189 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 190 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 191 | { |
9903cd1c CL |
192 | u8 *buf = (u8 *) packet; |
193 | int j; | |
a246b010 | 194 | |
46121cf7 | 195 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
196 | for (j = 0; j < count && j < 128; j += 4) { |
197 | if (!(j & 31)) { | |
198 | if (j) | |
199 | dprintk("\n"); | |
200 | dprintk("0x%04x ", j); | |
201 | } | |
202 | dprintk("%02x%02x%02x%02x ", | |
203 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
204 | } | |
205 | dprintk("\n"); | |
206 | } | |
207 | #else | |
9903cd1c | 208 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
209 | { |
210 | /* NOP */ | |
211 | } | |
212 | #endif | |
213 | ||
ffc2e518 CL |
214 | struct sock_xprt { |
215 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
216 | |
217 | /* | |
218 | * Network layer | |
219 | */ | |
220 | struct socket * sock; | |
221 | struct sock * inet; | |
51971139 CL |
222 | |
223 | /* | |
224 | * State of TCP reply receive | |
225 | */ | |
226 | __be32 tcp_fraghdr, | |
227 | tcp_xid; | |
228 | ||
229 | u32 tcp_offset, | |
230 | tcp_reclen; | |
231 | ||
232 | unsigned long tcp_copied, | |
233 | tcp_flags; | |
c8475461 CL |
234 | |
235 | /* | |
236 | * Connection of transports | |
237 | */ | |
34161db6 | 238 | struct delayed_work connect_worker; |
fbfffbd5 CL |
239 | struct sockaddr_storage srcaddr; |
240 | unsigned short srcport; | |
7c6e066e CL |
241 | |
242 | /* | |
243 | * UDP socket buffer size parameters | |
244 | */ | |
245 | size_t rcvsize, | |
246 | sndsize; | |
314dfd79 CL |
247 | |
248 | /* | |
249 | * Saved socket callback addresses | |
250 | */ | |
251 | void (*old_data_ready)(struct sock *, int); | |
252 | void (*old_state_change)(struct sock *); | |
253 | void (*old_write_space)(struct sock *); | |
2a9e1cfa | 254 | void (*old_error_report)(struct sock *); |
ffc2e518 CL |
255 | }; |
256 | ||
e136d092 CL |
257 | /* |
258 | * TCP receive state flags | |
259 | */ | |
260 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
261 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
262 | #define TCP_RCV_COPY_XID (1UL << 2) | |
263 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
264 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
265 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
266 | |
267 | /* | |
268 | * TCP RPC flags | |
269 | */ | |
f4a2e418 | 270 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 271 | |
95392c59 CL |
272 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
273 | { | |
274 | return (struct sockaddr *) &xprt->addr; | |
275 | } | |
276 | ||
277 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) | |
edb267a6 | 278 | { |
95392c59 CL |
279 | return (struct sockaddr_in *) &xprt->addr; |
280 | } | |
281 | ||
282 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
283 | { | |
284 | return (struct sockaddr_in6 *) &xprt->addr; | |
285 | } | |
286 | ||
c877b849 | 287 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 288 | { |
c877b849 | 289 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
290 | struct sockaddr_in6 *sin6; |
291 | struct sockaddr_in *sin; | |
c877b849 | 292 | char buf[128]; |
edb267a6 | 293 | |
c877b849 CL |
294 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
295 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
fbfe3cc6 | 296 | |
9dc3b095 CL |
297 | switch (sap->sa_family) { |
298 | case AF_INET: | |
299 | sin = xs_addr_in(xprt); | |
fc0b5791 | 300 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
9dc3b095 CL |
301 | break; |
302 | case AF_INET6: | |
303 | sin6 = xs_addr_in6(xprt); | |
fc0b5791 | 304 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
9dc3b095 CL |
305 | break; |
306 | default: | |
307 | BUG(); | |
756805e7 | 308 | } |
9dc3b095 | 309 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
310 | } |
311 | ||
9dc3b095 | 312 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 313 | { |
9dc3b095 CL |
314 | struct sockaddr *sap = xs_addr(xprt); |
315 | char buf[128]; | |
4b6473fb | 316 | |
81160e66 | 317 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 318 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
4b6473fb | 319 | |
81160e66 | 320 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 CL |
321 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
322 | } | |
4b6473fb | 323 | |
9dc3b095 CL |
324 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
325 | const char *protocol, | |
326 | const char *netid) | |
c877b849 | 327 | { |
b454ae90 | 328 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 329 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 330 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 331 | xs_format_common_peer_ports(xprt); |
edb267a6 | 332 | } |
4b6473fb | 333 | |
9dc3b095 | 334 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 335 | { |
9dc3b095 CL |
336 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
337 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 338 | |
9dc3b095 | 339 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
340 | } |
341 | ||
342 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
343 | { | |
33e01dc7 CL |
344 | unsigned int i; |
345 | ||
346 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
347 | switch (i) { | |
348 | case RPC_DISPLAY_PROTO: | |
349 | case RPC_DISPLAY_NETID: | |
350 | continue; | |
351 | default: | |
352 | kfree(xprt->address_strings[i]); | |
353 | } | |
edb267a6 CL |
354 | } |
355 | ||
b4b5cc85 CL |
356 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
357 | ||
24c5684b | 358 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 359 | { |
b4b5cc85 CL |
360 | struct msghdr msg = { |
361 | .msg_name = addr, | |
362 | .msg_namelen = addrlen, | |
24c5684b TM |
363 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
364 | }; | |
365 | struct kvec iov = { | |
366 | .iov_base = vec->iov_base + base, | |
367 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
368 | }; |
369 | ||
24c5684b | 370 | if (iov.iov_len != 0) |
b4b5cc85 CL |
371 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
372 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
373 | } | |
374 | ||
24c5684b | 375 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 376 | { |
24c5684b TM |
377 | struct page **ppage; |
378 | unsigned int remainder; | |
379 | int err, sent = 0; | |
380 | ||
381 | remainder = xdr->page_len - base; | |
382 | base += xdr->page_base; | |
383 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
384 | base &= ~PAGE_MASK; | |
385 | for(;;) { | |
386 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
387 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 388 | |
24c5684b TM |
389 | remainder -= len; |
390 | if (remainder != 0 || more) | |
391 | flags |= MSG_MORE; | |
392 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
393 | if (remainder == 0 || err != len) | |
394 | break; | |
395 | sent += err; | |
396 | ppage++; | |
397 | base = 0; | |
398 | } | |
399 | if (sent == 0) | |
400 | return err; | |
401 | if (err > 0) | |
402 | sent += err; | |
403 | return sent; | |
b4b5cc85 CL |
404 | } |
405 | ||
9903cd1c CL |
406 | /** |
407 | * xs_sendpages - write pages directly to a socket | |
408 | * @sock: socket to send on | |
409 | * @addr: UDP only -- address of destination | |
410 | * @addrlen: UDP only -- length of destination address | |
411 | * @xdr: buffer containing this request | |
412 | * @base: starting position in the buffer | |
413 | * | |
a246b010 | 414 | */ |
24c5684b | 415 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 416 | { |
24c5684b TM |
417 | unsigned int remainder = xdr->len - base; |
418 | int err, sent = 0; | |
a246b010 | 419 | |
262965f5 | 420 | if (unlikely(!sock)) |
fba91afb | 421 | return -ENOTSOCK; |
262965f5 CL |
422 | |
423 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
424 | if (base != 0) { |
425 | addr = NULL; | |
426 | addrlen = 0; | |
427 | } | |
262965f5 | 428 | |
24c5684b TM |
429 | if (base < xdr->head[0].iov_len || addr != NULL) { |
430 | unsigned int len = xdr->head[0].iov_len - base; | |
431 | remainder -= len; | |
432 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
433 | if (remainder == 0 || err != len) | |
a246b010 | 434 | goto out; |
24c5684b | 435 | sent += err; |
a246b010 CL |
436 | base = 0; |
437 | } else | |
24c5684b | 438 | base -= xdr->head[0].iov_len; |
a246b010 | 439 | |
24c5684b TM |
440 | if (base < xdr->page_len) { |
441 | unsigned int len = xdr->page_len - base; | |
442 | remainder -= len; | |
443 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
444 | if (remainder == 0 || err != len) | |
a246b010 | 445 | goto out; |
24c5684b | 446 | sent += err; |
a246b010 | 447 | base = 0; |
24c5684b TM |
448 | } else |
449 | base -= xdr->page_len; | |
450 | ||
451 | if (base >= xdr->tail[0].iov_len) | |
452 | return sent; | |
453 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 454 | out: |
24c5684b TM |
455 | if (sent == 0) |
456 | return err; | |
457 | if (err > 0) | |
458 | sent += err; | |
459 | return sent; | |
a246b010 CL |
460 | } |
461 | ||
b6ddf64f TM |
462 | static void xs_nospace_callback(struct rpc_task *task) |
463 | { | |
464 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
465 | ||
466 | transport->inet->sk_write_pending--; | |
467 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
468 | } | |
469 | ||
9903cd1c | 470 | /** |
262965f5 CL |
471 | * xs_nospace - place task on wait queue if transmit was incomplete |
472 | * @task: task to put to sleep | |
9903cd1c | 473 | * |
a246b010 | 474 | */ |
5e3771ce | 475 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 476 | { |
262965f5 CL |
477 | struct rpc_rqst *req = task->tk_rqstp; |
478 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 479 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
5e3771ce | 480 | int ret = 0; |
a246b010 | 481 | |
46121cf7 | 482 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
483 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
484 | req->rq_slen); | |
485 | ||
b6ddf64f TM |
486 | /* Protect against races with write_space */ |
487 | spin_lock_bh(&xprt->transport_lock); | |
488 | ||
489 | /* Don't race with disconnect */ | |
490 | if (xprt_connected(xprt)) { | |
491 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
5e3771ce | 492 | ret = -EAGAIN; |
b6ddf64f TM |
493 | /* |
494 | * Notify TCP that we're limited by the application | |
495 | * window size | |
496 | */ | |
497 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
498 | transport->inet->sk_write_pending++; | |
499 | /* ...and wait for more buffer space */ | |
500 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
501 | } | |
502 | } else { | |
503 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 504 | ret = -ENOTCONN; |
b6ddf64f | 505 | } |
262965f5 | 506 | |
b6ddf64f | 507 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 508 | return ret; |
262965f5 CL |
509 | } |
510 | ||
511 | /** | |
512 | * xs_udp_send_request - write an RPC request to a UDP socket | |
513 | * @task: address of RPC task that manages the state of an RPC request | |
514 | * | |
515 | * Return values: | |
516 | * 0: The request has been sent | |
517 | * EAGAIN: The socket was blocked, please call again later to | |
518 | * complete the request | |
519 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
520 | * other: Some other error occured, the request was not sent | |
521 | */ | |
522 | static int xs_udp_send_request(struct rpc_task *task) | |
523 | { | |
524 | struct rpc_rqst *req = task->tk_rqstp; | |
525 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 526 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
527 | struct xdr_buf *xdr = &req->rq_snd_buf; |
528 | int status; | |
a246b010 | 529 | |
9903cd1c | 530 | xs_pktdump("packet data:", |
a246b010 CL |
531 | req->rq_svec->iov_base, |
532 | req->rq_svec->iov_len); | |
533 | ||
01d37c42 TM |
534 | if (!xprt_bound(xprt)) |
535 | return -ENOTCONN; | |
ee0ac0c2 | 536 | status = xs_sendpages(transport->sock, |
95392c59 | 537 | xs_addr(xprt), |
ee0ac0c2 CL |
538 | xprt->addrlen, xdr, |
539 | req->rq_bytes_sent); | |
a246b010 | 540 | |
46121cf7 | 541 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 542 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 543 | |
2199700f TM |
544 | if (status >= 0) { |
545 | task->tk_bytes_sent += status; | |
546 | if (status >= req->rq_slen) | |
547 | return 0; | |
548 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 549 | status = -EAGAIN; |
2199700f | 550 | } |
a246b010 | 551 | |
262965f5 | 552 | switch (status) { |
fba91afb TM |
553 | case -ENOTSOCK: |
554 | status = -ENOTCONN; | |
555 | /* Should we call xs_close() here? */ | |
556 | break; | |
b6ddf64f | 557 | case -EAGAIN: |
5e3771ce | 558 | status = xs_nospace(task); |
b6ddf64f | 559 | break; |
c8485e4d TM |
560 | default: |
561 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
562 | -status); | |
262965f5 CL |
563 | case -ENETUNREACH: |
564 | case -EPIPE: | |
a246b010 CL |
565 | case -ECONNREFUSED: |
566 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 567 | * prompts ECONNREFUSED. */ |
b6ddf64f | 568 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 569 | } |
5fe46e9d | 570 | |
262965f5 | 571 | return status; |
a246b010 CL |
572 | } |
573 | ||
e06799f9 TM |
574 | /** |
575 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
576 | * @xprt: transport | |
577 | * | |
578 | * Initiates a graceful shutdown of the TCP socket by calling the | |
579 | * equivalent of shutdown(SHUT_WR); | |
580 | */ | |
581 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
582 | { | |
583 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
584 | struct socket *sock = transport->sock; | |
585 | ||
586 | if (sock != NULL) | |
587 | kernel_sock_shutdown(sock, SHUT_WR); | |
588 | } | |
589 | ||
808012fb CL |
590 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
591 | { | |
592 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
593 | rpc_fraghdr *base = buf->head[0].iov_base; | |
594 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
595 | } | |
596 | ||
9903cd1c | 597 | /** |
262965f5 | 598 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
599 | * @task: address of RPC task that manages the state of an RPC request |
600 | * | |
601 | * Return values: | |
262965f5 CL |
602 | * 0: The request has been sent |
603 | * EAGAIN: The socket was blocked, please call again later to | |
604 | * complete the request | |
605 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
606 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
607 | * |
608 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 609 | * if sendmsg is not able to make progress? |
9903cd1c | 610 | */ |
262965f5 | 611 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
612 | { |
613 | struct rpc_rqst *req = task->tk_rqstp; | |
614 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 615 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 616 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 617 | int status; |
a246b010 | 618 | |
808012fb | 619 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 620 | |
262965f5 CL |
621 | xs_pktdump("packet data:", |
622 | req->rq_svec->iov_base, | |
623 | req->rq_svec->iov_len); | |
a246b010 CL |
624 | |
625 | /* Continue transmitting the packet/record. We must be careful | |
626 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 627 | * called sendmsg(). */ |
a246b010 | 628 | while (1) { |
ee0ac0c2 CL |
629 | status = xs_sendpages(transport->sock, |
630 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 631 | |
46121cf7 | 632 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 633 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 634 | |
262965f5 | 635 | if (unlikely(status < 0)) |
a246b010 | 636 | break; |
a246b010 | 637 | |
262965f5 CL |
638 | /* If we've sent the entire packet, immediately |
639 | * reset the count of bytes sent. */ | |
640 | req->rq_bytes_sent += status; | |
ef759a2e | 641 | task->tk_bytes_sent += status; |
262965f5 CL |
642 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
643 | req->rq_bytes_sent = 0; | |
644 | return 0; | |
645 | } | |
a246b010 | 646 | |
06b4b681 TM |
647 | if (status != 0) |
648 | continue; | |
a246b010 | 649 | status = -EAGAIN; |
06b4b681 | 650 | break; |
a246b010 CL |
651 | } |
652 | ||
262965f5 | 653 | switch (status) { |
fba91afb TM |
654 | case -ENOTSOCK: |
655 | status = -ENOTCONN; | |
656 | /* Should we call xs_close() here? */ | |
657 | break; | |
262965f5 | 658 | case -EAGAIN: |
5e3771ce | 659 | status = xs_nospace(task); |
262965f5 | 660 | break; |
c8485e4d TM |
661 | default: |
662 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
663 | -status); | |
262965f5 | 664 | case -ECONNRESET: |
55420c24 | 665 | case -EPIPE: |
2a9e1cfa TM |
666 | xs_tcp_shutdown(xprt); |
667 | case -ECONNREFUSED: | |
262965f5 | 668 | case -ENOTCONN: |
b6ddf64f | 669 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 670 | } |
5fe46e9d | 671 | |
a246b010 CL |
672 | return status; |
673 | } | |
674 | ||
e0ab53de TM |
675 | /** |
676 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
677 | * @xprt: transport | |
678 | * @task: rpc task | |
679 | * | |
680 | * This cleans up if an error causes us to abort the transmission of a request. | |
681 | * In this case, the socket may need to be reset in order to avoid confusing | |
682 | * the server. | |
683 | */ | |
684 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
685 | { | |
686 | struct rpc_rqst *req; | |
687 | ||
688 | if (task != xprt->snd_task) | |
689 | return; | |
690 | if (task == NULL) | |
691 | goto out_release; | |
692 | req = task->tk_rqstp; | |
693 | if (req->rq_bytes_sent == 0) | |
694 | goto out_release; | |
695 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
696 | goto out_release; | |
697 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
698 | out_release: | |
699 | xprt_release_xprt(xprt, task); | |
700 | } | |
701 | ||
2a9e1cfa TM |
702 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
703 | { | |
704 | transport->old_data_ready = sk->sk_data_ready; | |
705 | transport->old_state_change = sk->sk_state_change; | |
706 | transport->old_write_space = sk->sk_write_space; | |
707 | transport->old_error_report = sk->sk_error_report; | |
708 | } | |
709 | ||
710 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
711 | { | |
712 | sk->sk_data_ready = transport->old_data_ready; | |
713 | sk->sk_state_change = transport->old_state_change; | |
714 | sk->sk_write_space = transport->old_write_space; | |
715 | sk->sk_error_report = transport->old_error_report; | |
716 | } | |
717 | ||
fe315e76 | 718 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 719 | { |
ee0ac0c2 CL |
720 | struct socket *sock = transport->sock; |
721 | struct sock *sk = transport->inet; | |
a246b010 | 722 | |
fe315e76 CL |
723 | if (sk == NULL) |
724 | return; | |
9903cd1c | 725 | |
a246b010 | 726 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
727 | transport->inet = NULL; |
728 | transport->sock = NULL; | |
a246b010 | 729 | |
9903cd1c | 730 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
731 | |
732 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
733 | write_unlock_bh(&sk->sk_callback_lock); |
734 | ||
9903cd1c | 735 | sk->sk_no_check = 0; |
a246b010 CL |
736 | |
737 | sock_release(sock); | |
fe315e76 CL |
738 | } |
739 | ||
740 | /** | |
741 | * xs_close - close a socket | |
742 | * @xprt: transport | |
743 | * | |
744 | * This is used when all requests are complete; ie, no DRC state remains | |
745 | * on the server we want to save. | |
f75e6745 TM |
746 | * |
747 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
748 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
749 | */ |
750 | static void xs_close(struct rpc_xprt *xprt) | |
751 | { | |
752 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
753 | ||
754 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
755 | ||
756 | xs_reset_transport(transport); | |
61d0a8e6 | 757 | xprt->reestablish_timeout = 0; |
fe315e76 | 758 | |
632e3bdc | 759 | smp_mb__before_clear_bit(); |
7d1e8255 | 760 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 761 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 762 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 763 | smp_mb__after_clear_bit(); |
62da3b24 | 764 | xprt_disconnect_done(xprt); |
a246b010 CL |
765 | } |
766 | ||
f75e6745 TM |
767 | static void xs_tcp_close(struct rpc_xprt *xprt) |
768 | { | |
769 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
770 | xs_close(xprt); | |
771 | else | |
772 | xs_tcp_shutdown(xprt); | |
773 | } | |
774 | ||
9903cd1c CL |
775 | /** |
776 | * xs_destroy - prepare to shutdown a transport | |
777 | * @xprt: doomed transport | |
778 | * | |
779 | */ | |
780 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 781 | { |
c8475461 CL |
782 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
783 | ||
46121cf7 | 784 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 785 | |
c1384c9c | 786 | cancel_rearming_delayed_work(&transport->connect_worker); |
a246b010 | 787 | |
9903cd1c | 788 | xs_close(xprt); |
edb267a6 | 789 | xs_free_peer_addresses(xprt); |
a246b010 | 790 | kfree(xprt->slot); |
c8541ecd | 791 | kfree(xprt); |
bc25571e | 792 | module_put(THIS_MODULE); |
a246b010 CL |
793 | } |
794 | ||
9903cd1c CL |
795 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
796 | { | |
797 | return (struct rpc_xprt *) sk->sk_user_data; | |
798 | } | |
799 | ||
800 | /** | |
801 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
802 | * @sk: socket with data to read | |
803 | * @len: how much data to read | |
804 | * | |
a246b010 | 805 | */ |
9903cd1c | 806 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 807 | { |
9903cd1c CL |
808 | struct rpc_task *task; |
809 | struct rpc_xprt *xprt; | |
a246b010 | 810 | struct rpc_rqst *rovr; |
9903cd1c | 811 | struct sk_buff *skb; |
a246b010 | 812 | int err, repsize, copied; |
d8ed029d AD |
813 | u32 _xid; |
814 | __be32 *xp; | |
a246b010 CL |
815 | |
816 | read_lock(&sk->sk_callback_lock); | |
46121cf7 | 817 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 818 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 819 | goto out; |
a246b010 CL |
820 | |
821 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
822 | goto out; | |
823 | ||
824 | if (xprt->shutdown) | |
825 | goto dropit; | |
826 | ||
827 | repsize = skb->len - sizeof(struct udphdr); | |
828 | if (repsize < 4) { | |
46121cf7 | 829 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
830 | goto dropit; |
831 | } | |
832 | ||
833 | /* Copy the XID from the skb... */ | |
834 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
835 | sizeof(_xid), &_xid); | |
836 | if (xp == NULL) | |
837 | goto dropit; | |
838 | ||
839 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 840 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
841 | rovr = xprt_lookup_rqst(xprt, *xp); |
842 | if (!rovr) | |
843 | goto out_unlock; | |
844 | task = rovr->rq_task; | |
845 | ||
a246b010 CL |
846 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
847 | copied = repsize; | |
848 | ||
849 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
850 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
851 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 852 | goto out_unlock; |
1781f7f5 HX |
853 | } |
854 | ||
855 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 CL |
856 | |
857 | /* Something worked... */ | |
adf30907 | 858 | dst_confirm(skb_dst(skb)); |
a246b010 | 859 | |
1570c1e4 CL |
860 | xprt_adjust_cwnd(task, copied); |
861 | xprt_update_rtt(task); | |
862 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
863 | |
864 | out_unlock: | |
4a0f8c04 | 865 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
866 | dropit: |
867 | skb_free_datagram(sk, skb); | |
868 | out: | |
869 | read_unlock(&sk->sk_callback_lock); | |
870 | } | |
871 | ||
dd456471 | 872 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 873 | { |
51971139 | 874 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
875 | size_t len, used; |
876 | char *p; | |
877 | ||
51971139 CL |
878 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
879 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 880 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 881 | transport->tcp_offset += used; |
a246b010 CL |
882 | if (used != len) |
883 | return; | |
808012fb | 884 | |
51971139 CL |
885 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
886 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 887 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 888 | else |
e136d092 | 889 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 890 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 891 | |
e136d092 | 892 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 893 | transport->tcp_offset = 0; |
808012fb | 894 | |
a246b010 | 895 | /* Sanity check of the record length */ |
18dca02a | 896 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 897 | dprintk("RPC: invalid TCP record fragment length\n"); |
3ebb067d | 898 | xprt_force_disconnect(xprt); |
9903cd1c | 899 | return; |
a246b010 | 900 | } |
46121cf7 | 901 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 902 | transport->tcp_reclen); |
a246b010 CL |
903 | } |
904 | ||
51971139 | 905 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 906 | { |
51971139 | 907 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 908 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 909 | transport->tcp_offset = 0; |
e136d092 CL |
910 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
911 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
912 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 913 | transport->tcp_copied = 0; |
a246b010 CL |
914 | } |
915 | } | |
916 | } | |
917 | ||
dd456471 | 918 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
919 | { |
920 | size_t len, used; | |
921 | char *p; | |
922 | ||
51971139 | 923 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 924 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 925 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 926 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 927 | transport->tcp_offset += used; |
a246b010 CL |
928 | if (used != len) |
929 | return; | |
e136d092 | 930 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 931 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 932 | transport->tcp_copied = 4; |
18dca02a RL |
933 | dprintk("RPC: reading %s XID %08x\n", |
934 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
935 | : "request with", | |
51971139 CL |
936 | ntohl(transport->tcp_xid)); |
937 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
938 | } |
939 | ||
18dca02a RL |
940 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
941 | struct xdr_skb_reader *desc) | |
a246b010 | 942 | { |
18dca02a RL |
943 | size_t len, used; |
944 | u32 offset; | |
945 | __be32 calldir; | |
946 | ||
947 | /* | |
948 | * We want transport->tcp_offset to be 8 at the end of this routine | |
949 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
950 | * When this function is called for the first time, | |
951 | * transport->tcp_offset is 4 (after having already read the xid). | |
952 | */ | |
953 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
954 | len = sizeof(calldir) - offset; | |
955 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); | |
956 | used = xdr_skb_read_bits(desc, &calldir, len); | |
957 | transport->tcp_offset += used; | |
958 | if (used != len) | |
959 | return; | |
f4a2e418 RL |
960 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
961 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
18dca02a | 962 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
f4a2e418 RL |
963 | /* |
964 | * We don't yet have the XDR buffer, so we will write the calldir | |
965 | * out after we get the buffer from the 'struct rpc_rqst' | |
966 | */ | |
18dca02a RL |
967 | if (ntohl(calldir) == RPC_REPLY) |
968 | transport->tcp_flags |= TCP_RPC_REPLY; | |
969 | else | |
970 | transport->tcp_flags &= ~TCP_RPC_REPLY; | |
971 | dprintk("RPC: reading %s CALL/REPLY flag %08x\n", | |
972 | (transport->tcp_flags & TCP_RPC_REPLY) ? | |
973 | "reply for" : "request with", calldir); | |
974 | xs_tcp_check_fraghdr(transport); | |
975 | } | |
976 | ||
44b98efd RL |
977 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
978 | struct xdr_skb_reader *desc, | |
979 | struct rpc_rqst *req) | |
a246b010 | 980 | { |
44b98efd RL |
981 | struct sock_xprt *transport = |
982 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
983 | struct xdr_buf *rcvbuf; |
984 | size_t len; | |
985 | ssize_t r; | |
986 | ||
a246b010 | 987 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
988 | |
989 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
990 | /* | |
991 | * Save the RPC direction in the XDR buffer | |
992 | */ | |
993 | __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? | |
994 | htonl(RPC_REPLY) : 0; | |
995 | ||
996 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, | |
997 | &calldir, sizeof(calldir)); | |
998 | transport->tcp_copied += sizeof(calldir); | |
999 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; | |
a246b010 CL |
1000 | } |
1001 | ||
a246b010 | 1002 | len = desc->count; |
51971139 | 1003 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1004 | struct xdr_skb_reader my_desc; |
a246b010 | 1005 | |
51971139 | 1006 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1007 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1008 | my_desc.count = len; | |
51971139 | 1009 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1010 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1011 | desc->count -= r; |
1012 | desc->offset += r; | |
1013 | } else | |
51971139 | 1014 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1015 | desc, xdr_skb_read_bits); |
a246b010 CL |
1016 | |
1017 | if (r > 0) { | |
51971139 CL |
1018 | transport->tcp_copied += r; |
1019 | transport->tcp_offset += r; | |
a246b010 CL |
1020 | } |
1021 | if (r != len) { | |
1022 | /* Error when copying to the receive buffer, | |
1023 | * usually because we weren't able to allocate | |
1024 | * additional buffer pages. All we can do now | |
e136d092 | 1025 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1026 | * will not receive any additional updates, |
1027 | * and time out. | |
1028 | * Any remaining data from this record will | |
1029 | * be discarded. | |
1030 | */ | |
e136d092 | 1031 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1032 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1033 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1034 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1035 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1036 | xprt, transport->tcp_copied, | |
1037 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1038 | return; |
a246b010 CL |
1039 | } |
1040 | ||
46121cf7 | 1041 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1042 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1043 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1044 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1045 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1046 | |
1047 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1048 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1049 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1050 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1051 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 CL |
1052 | } |
1053 | ||
44b98efd RL |
1054 | return; |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Finds the request corresponding to the RPC xid and invokes the common | |
1059 | * tcp read code to read the data. | |
1060 | */ | |
1061 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1062 | struct xdr_skb_reader *desc) | |
1063 | { | |
1064 | struct sock_xprt *transport = | |
1065 | container_of(xprt, struct sock_xprt, xprt); | |
1066 | struct rpc_rqst *req; | |
1067 | ||
1068 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1069 | ||
1070 | /* Find and lock the request corresponding to this xid */ | |
1071 | spin_lock(&xprt->transport_lock); | |
1072 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1073 | if (!req) { | |
1074 | dprintk("RPC: XID %08x request not found!\n", | |
1075 | ntohl(transport->tcp_xid)); | |
1076 | spin_unlock(&xprt->transport_lock); | |
1077 | return -1; | |
1078 | } | |
1079 | ||
1080 | xs_tcp_read_common(xprt, desc, req); | |
1081 | ||
e136d092 | 1082 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1083 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1084 | |
4a0f8c04 | 1085 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1086 | return 0; |
1087 | } | |
1088 | ||
1089 | #if defined(CONFIG_NFS_V4_1) | |
1090 | /* | |
1091 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1092 | * tcp read code to read the data. The result is placed in the callback | |
1093 | * queue. | |
1094 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1095 | * connection and return -1. | |
1096 | */ | |
1097 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1098 | struct xdr_skb_reader *desc) | |
1099 | { | |
1100 | struct sock_xprt *transport = | |
1101 | container_of(xprt, struct sock_xprt, xprt); | |
1102 | struct rpc_rqst *req; | |
1103 | ||
1104 | req = xprt_alloc_bc_request(xprt); | |
1105 | if (req == NULL) { | |
1106 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1107 | xprt_force_disconnect(xprt); | |
1108 | return -1; | |
1109 | } | |
1110 | ||
1111 | req->rq_xid = transport->tcp_xid; | |
1112 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1113 | xs_tcp_read_common(xprt, desc, req); | |
1114 | ||
1115 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1116 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1117 | ||
1118 | /* | |
1119 | * Add callback request to callback list. The callback | |
1120 | * service sleeps on the sv_cb_waitq waiting for new | |
1121 | * requests. Wake it up after adding enqueing the | |
1122 | * request. | |
1123 | */ | |
1124 | dprintk("RPC: add callback request to list\n"); | |
1125 | spin_lock(&bc_serv->sv_cb_lock); | |
1126 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1127 | spin_unlock(&bc_serv->sv_cb_lock); | |
1128 | wake_up(&bc_serv->sv_cb_waitq); | |
1129 | } | |
1130 | ||
1131 | req->rq_private_buf.len = transport->tcp_copied; | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1137 | struct xdr_skb_reader *desc) | |
1138 | { | |
1139 | struct sock_xprt *transport = | |
1140 | container_of(xprt, struct sock_xprt, xprt); | |
1141 | ||
1142 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1143 | xs_tcp_read_reply(xprt, desc) : | |
1144 | xs_tcp_read_callback(xprt, desc); | |
1145 | } | |
1146 | #else | |
1147 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1148 | struct xdr_skb_reader *desc) | |
1149 | { | |
1150 | return xs_tcp_read_reply(xprt, desc); | |
1151 | } | |
1152 | #endif /* CONFIG_NFS_V4_1 */ | |
1153 | ||
1154 | /* | |
1155 | * Read data off the transport. This can be either an RPC_CALL or an | |
1156 | * RPC_REPLY. Relay the processing to helper functions. | |
1157 | */ | |
1158 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1159 | struct xdr_skb_reader *desc) | |
1160 | { | |
1161 | struct sock_xprt *transport = | |
1162 | container_of(xprt, struct sock_xprt, xprt); | |
1163 | ||
1164 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1165 | xs_tcp_check_fraghdr(transport); | |
1166 | else { | |
1167 | /* | |
1168 | * The transport_lock protects the request handling. | |
1169 | * There's no need to hold it to update the tcp_flags. | |
1170 | */ | |
1171 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1172 | } | |
a246b010 CL |
1173 | } |
1174 | ||
dd456471 | 1175 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1176 | { |
1177 | size_t len; | |
1178 | ||
51971139 | 1179 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1180 | if (len > desc->count) |
1181 | len = desc->count; | |
1182 | desc->count -= len; | |
1183 | desc->offset += len; | |
51971139 | 1184 | transport->tcp_offset += len; |
46121cf7 | 1185 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1186 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1187 | } |
1188 | ||
9903cd1c | 1189 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1190 | { |
1191 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1192 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1193 | struct xdr_skb_reader desc = { |
a246b010 CL |
1194 | .skb = skb, |
1195 | .offset = offset, | |
1196 | .count = len, | |
9903cd1c | 1197 | }; |
a246b010 | 1198 | |
46121cf7 | 1199 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1200 | do { |
1201 | /* Read in a new fragment marker if necessary */ | |
1202 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1203 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1204 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1205 | continue; |
1206 | } | |
1207 | /* Read in the xid if necessary */ | |
e136d092 | 1208 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1209 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1210 | continue; |
1211 | } | |
18dca02a | 1212 | /* Read in the call/reply flag */ |
f4a2e418 | 1213 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1214 | xs_tcp_read_calldir(transport, &desc); |
1215 | continue; | |
1216 | } | |
a246b010 | 1217 | /* Read in the request data */ |
e136d092 | 1218 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1219 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1220 | continue; |
1221 | } | |
1222 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1223 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1224 | } while (desc.count); |
46121cf7 | 1225 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1226 | return len - desc.count; |
1227 | } | |
1228 | ||
9903cd1c CL |
1229 | /** |
1230 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1231 | * @sk: socket with data to read | |
1232 | * @bytes: how much data to read | |
1233 | * | |
1234 | */ | |
1235 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1236 | { |
1237 | struct rpc_xprt *xprt; | |
1238 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1239 | int read; |
a246b010 | 1240 | |
46121cf7 CL |
1241 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1242 | ||
a246b010 | 1243 | read_lock(&sk->sk_callback_lock); |
9903cd1c | 1244 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1245 | goto out; |
a246b010 CL |
1246 | if (xprt->shutdown) |
1247 | goto out; | |
1248 | ||
61d0a8e6 NB |
1249 | /* Any data means we had a useful conversation, so |
1250 | * the we don't need to delay the next reconnect | |
1251 | */ | |
1252 | if (xprt->reestablish_timeout) | |
1253 | xprt->reestablish_timeout = 0; | |
1254 | ||
9903cd1c | 1255 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1256 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1257 | do { |
1258 | rd_desc.count = 65536; | |
1259 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1260 | } while (read > 0); | |
a246b010 CL |
1261 | out: |
1262 | read_unlock(&sk->sk_callback_lock); | |
1263 | } | |
1264 | ||
7d1e8255 TM |
1265 | /* |
1266 | * Do the equivalent of linger/linger2 handling for dealing with | |
1267 | * broken servers that don't close the socket in a timely | |
1268 | * fashion | |
1269 | */ | |
1270 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1271 | unsigned long timeout) | |
1272 | { | |
1273 | struct sock_xprt *transport; | |
1274 | ||
1275 | if (xprt_test_and_set_connecting(xprt)) | |
1276 | return; | |
1277 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1278 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1279 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1280 | timeout); | |
1281 | } | |
1282 | ||
1283 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1284 | { | |
1285 | struct sock_xprt *transport; | |
1286 | ||
1287 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1288 | ||
1289 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1290 | !cancel_delayed_work(&transport->connect_worker)) | |
1291 | return; | |
1292 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1293 | xprt_clear_connecting(xprt); | |
1294 | } | |
1295 | ||
1296 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1297 | { | |
1298 | smp_mb__before_clear_bit(); | |
1299 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1300 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1301 | smp_mb__after_clear_bit(); | |
1302 | /* Mark transport as closed and wake up all pending tasks */ | |
1303 | xprt_disconnect_done(xprt); | |
1304 | } | |
1305 | ||
9903cd1c CL |
1306 | /** |
1307 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1308 | * @sk: socket whose state has changed | |
1309 | * | |
1310 | */ | |
1311 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1312 | { |
9903cd1c | 1313 | struct rpc_xprt *xprt; |
a246b010 CL |
1314 | |
1315 | read_lock(&sk->sk_callback_lock); | |
1316 | if (!(xprt = xprt_from_sock(sk))) | |
1317 | goto out; | |
46121cf7 CL |
1318 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1319 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", | |
1320 | sk->sk_state, xprt_connected(xprt), | |
1321 | sock_flag(sk, SOCK_DEAD), | |
1322 | sock_flag(sk, SOCK_ZAPPED)); | |
a246b010 CL |
1323 | |
1324 | switch (sk->sk_state) { | |
1325 | case TCP_ESTABLISHED: | |
4a0f8c04 | 1326 | spin_lock_bh(&xprt->transport_lock); |
a246b010 | 1327 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1328 | struct sock_xprt *transport = container_of(xprt, |
1329 | struct sock_xprt, xprt); | |
1330 | ||
a246b010 | 1331 | /* Reset TCP record info */ |
51971139 CL |
1332 | transport->tcp_offset = 0; |
1333 | transport->tcp_reclen = 0; | |
1334 | transport->tcp_copied = 0; | |
e136d092 CL |
1335 | transport->tcp_flags = |
1336 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1337 | |
2a491991 | 1338 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1339 | } |
4a0f8c04 | 1340 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 | 1341 | break; |
3b948ae5 TM |
1342 | case TCP_FIN_WAIT1: |
1343 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1344 | xprt->connect_cookie++; |
663b8858 | 1345 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1346 | set_bit(XPRT_CLOSING, &xprt->state); |
1347 | smp_mb__before_clear_bit(); | |
1348 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1349 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1350 | smp_mb__after_clear_bit(); |
25fe6142 | 1351 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1352 | break; |
632e3bdc | 1353 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1354 | /* The server initiated a shutdown of the socket */ |
66af1e55 | 1355 | xprt_force_disconnect(xprt); |
663b8858 | 1356 | case TCP_SYN_SENT: |
7c1d71cf | 1357 | xprt->connect_cookie++; |
663b8858 TM |
1358 | case TCP_CLOSING: |
1359 | /* | |
1360 | * If the server closed down the connection, make sure that | |
1361 | * we back off before reconnecting | |
1362 | */ | |
1363 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1364 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1365 | break; |
1366 | case TCP_LAST_ACK: | |
670f9457 | 1367 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1368 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1369 | smp_mb__before_clear_bit(); |
1370 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1371 | smp_mb__after_clear_bit(); | |
1372 | break; | |
1373 | case TCP_CLOSE: | |
7d1e8255 TM |
1374 | xs_tcp_cancel_linger_timeout(xprt); |
1375 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1376 | } |
1377 | out: | |
1378 | read_unlock(&sk->sk_callback_lock); | |
1379 | } | |
1380 | ||
2a9e1cfa | 1381 | /** |
482f32e6 | 1382 | * xs_error_report - callback mainly for catching socket errors |
2a9e1cfa TM |
1383 | * @sk: socket |
1384 | */ | |
482f32e6 | 1385 | static void xs_error_report(struct sock *sk) |
2a9e1cfa TM |
1386 | { |
1387 | struct rpc_xprt *xprt; | |
1388 | ||
1389 | read_lock(&sk->sk_callback_lock); | |
2a9e1cfa TM |
1390 | if (!(xprt = xprt_from_sock(sk))) |
1391 | goto out; | |
1392 | dprintk("RPC: %s client %p...\n" | |
1393 | "RPC: error %d\n", | |
1394 | __func__, xprt, sk->sk_err); | |
482f32e6 | 1395 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
2a9e1cfa TM |
1396 | out: |
1397 | read_unlock(&sk->sk_callback_lock); | |
1398 | } | |
1399 | ||
1f0fa154 IJ |
1400 | static void xs_write_space(struct sock *sk) |
1401 | { | |
1402 | struct socket *sock; | |
1403 | struct rpc_xprt *xprt; | |
1404 | ||
1405 | if (unlikely(!(sock = sk->sk_socket))) | |
1406 | return; | |
1407 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1408 | ||
1409 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1410 | return; | |
1411 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1412 | return; | |
1413 | ||
1414 | xprt_write_space(xprt); | |
1415 | } | |
1416 | ||
9903cd1c | 1417 | /** |
c7b2cae8 CL |
1418 | * xs_udp_write_space - callback invoked when socket buffer space |
1419 | * becomes available | |
9903cd1c CL |
1420 | * @sk: socket whose state has changed |
1421 | * | |
a246b010 CL |
1422 | * Called when more output buffer space is available for this socket. |
1423 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1424 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1425 | * with a bunch of small requests. |
1426 | */ | |
c7b2cae8 | 1427 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1428 | { |
a246b010 | 1429 | read_lock(&sk->sk_callback_lock); |
a246b010 | 1430 | |
c7b2cae8 | 1431 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1432 | if (sock_writeable(sk)) |
1433 | xs_write_space(sk); | |
a246b010 | 1434 | |
c7b2cae8 CL |
1435 | read_unlock(&sk->sk_callback_lock); |
1436 | } | |
a246b010 | 1437 | |
c7b2cae8 CL |
1438 | /** |
1439 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1440 | * becomes available | |
1441 | * @sk: socket whose state has changed | |
1442 | * | |
1443 | * Called when more output buffer space is available for this socket. | |
1444 | * We try not to wake our writers until they can make "significant" | |
1445 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1446 | * with a bunch of small requests. | |
1447 | */ | |
1448 | static void xs_tcp_write_space(struct sock *sk) | |
1449 | { | |
1450 | read_lock(&sk->sk_callback_lock); | |
1451 | ||
1452 | /* from net/core/stream.c:sk_stream_write_space */ | |
1f0fa154 IJ |
1453 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1454 | xs_write_space(sk); | |
b6ddf64f | 1455 | |
a246b010 CL |
1456 | read_unlock(&sk->sk_callback_lock); |
1457 | } | |
1458 | ||
470056c2 | 1459 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1460 | { |
ee0ac0c2 CL |
1461 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1462 | struct sock *sk = transport->inet; | |
a246b010 | 1463 | |
7c6e066e | 1464 | if (transport->rcvsize) { |
a246b010 | 1465 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1466 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1467 | } |
7c6e066e | 1468 | if (transport->sndsize) { |
a246b010 | 1469 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1470 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1471 | sk->sk_write_space(sk); |
1472 | } | |
1473 | } | |
1474 | ||
43118c29 | 1475 | /** |
470056c2 | 1476 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1477 | * @xprt: generic transport |
470056c2 CL |
1478 | * @sndsize: requested size of send buffer, in bytes |
1479 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1480 | * |
470056c2 | 1481 | * Set socket send and receive buffer size limits. |
43118c29 | 1482 | */ |
470056c2 | 1483 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1484 | { |
7c6e066e CL |
1485 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1486 | ||
1487 | transport->sndsize = 0; | |
470056c2 | 1488 | if (sndsize) |
7c6e066e CL |
1489 | transport->sndsize = sndsize + 1024; |
1490 | transport->rcvsize = 0; | |
470056c2 | 1491 | if (rcvsize) |
7c6e066e | 1492 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1493 | |
1494 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1495 | } |
1496 | ||
46c0ee8b CL |
1497 | /** |
1498 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1499 | * @task: task that timed out | |
1500 | * | |
1501 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1502 | */ | |
1503 | static void xs_udp_timer(struct rpc_task *task) | |
1504 | { | |
1505 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1506 | } | |
1507 | ||
b85d8806 CL |
1508 | static unsigned short xs_get_random_port(void) |
1509 | { | |
1510 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1511 | unsigned short rand = (unsigned short) net_random() % range; | |
1512 | return rand + xprt_min_resvport; | |
1513 | } | |
1514 | ||
92200412 CL |
1515 | /** |
1516 | * xs_set_port - reset the port number in the remote endpoint address | |
1517 | * @xprt: generic transport | |
1518 | * @port: new port number | |
1519 | * | |
1520 | */ | |
1521 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1522 | { | |
46121cf7 | 1523 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1524 | |
9dc3b095 CL |
1525 | rpc_set_port(xs_addr(xprt), port); |
1526 | xs_update_peer_port(xprt); | |
92200412 CL |
1527 | } |
1528 | ||
67a391d7 TM |
1529 | static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) |
1530 | { | |
fbfffbd5 | 1531 | unsigned short port = transport->srcport; |
67a391d7 TM |
1532 | |
1533 | if (port == 0 && transport->xprt.resvport) | |
1534 | port = xs_get_random_port(); | |
1535 | return port; | |
1536 | } | |
1537 | ||
1538 | static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) | |
1539 | { | |
fbfffbd5 CL |
1540 | if (transport->srcport != 0) |
1541 | transport->srcport = 0; | |
67a391d7 TM |
1542 | if (!transport->xprt.resvport) |
1543 | return 0; | |
1544 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1545 | return xprt_max_resvport; | |
1546 | return --port; | |
1547 | } | |
1548 | ||
7dc753f0 | 1549 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
a246b010 CL |
1550 | { |
1551 | struct sockaddr_in myaddr = { | |
1552 | .sin_family = AF_INET, | |
1553 | }; | |
d3bc9a1d | 1554 | struct sockaddr_in *sa; |
67a391d7 TM |
1555 | int err, nloop = 0; |
1556 | unsigned short port = xs_get_srcport(transport, sock); | |
1557 | unsigned short last; | |
a246b010 | 1558 | |
fbfffbd5 | 1559 | sa = (struct sockaddr_in *)&transport->srcaddr; |
d3bc9a1d | 1560 | myaddr.sin_addr = sa->sin_addr; |
a246b010 CL |
1561 | do { |
1562 | myaddr.sin_port = htons(port); | |
e6242e92 | 1563 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 | 1564 | sizeof(myaddr)); |
67a391d7 | 1565 | if (port == 0) |
d3bc9a1d | 1566 | break; |
a246b010 | 1567 | if (err == 0) { |
fbfffbd5 | 1568 | transport->srcport = port; |
d3bc9a1d | 1569 | break; |
a246b010 | 1570 | } |
67a391d7 TM |
1571 | last = port; |
1572 | port = xs_next_srcport(transport, sock, port); | |
1573 | if (port > last) | |
1574 | nloop++; | |
1575 | } while (err == -EADDRINUSE && nloop != 2); | |
21454aaa HH |
1576 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", |
1577 | __func__, &myaddr.sin_addr, | |
7dc753f0 | 1578 | port, err ? "failed" : "ok", err); |
a246b010 CL |
1579 | return err; |
1580 | } | |
1581 | ||
90058d37 CL |
1582 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1583 | { | |
1584 | struct sockaddr_in6 myaddr = { | |
1585 | .sin6_family = AF_INET6, | |
1586 | }; | |
1587 | struct sockaddr_in6 *sa; | |
67a391d7 TM |
1588 | int err, nloop = 0; |
1589 | unsigned short port = xs_get_srcport(transport, sock); | |
1590 | unsigned short last; | |
90058d37 | 1591 | |
fbfffbd5 | 1592 | sa = (struct sockaddr_in6 *)&transport->srcaddr; |
90058d37 CL |
1593 | myaddr.sin6_addr = sa->sin6_addr; |
1594 | do { | |
1595 | myaddr.sin6_port = htons(port); | |
1596 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, | |
1597 | sizeof(myaddr)); | |
67a391d7 | 1598 | if (port == 0) |
90058d37 CL |
1599 | break; |
1600 | if (err == 0) { | |
fbfffbd5 | 1601 | transport->srcport = port; |
90058d37 CL |
1602 | break; |
1603 | } | |
67a391d7 TM |
1604 | last = port; |
1605 | port = xs_next_srcport(transport, sock, port); | |
1606 | if (port > last) | |
1607 | nloop++; | |
1608 | } while (err == -EADDRINUSE && nloop != 2); | |
5b095d98 | 1609 | dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", |
fdb46ee7 | 1610 | &myaddr.sin6_addr, port, err ? "failed" : "ok", err); |
a246b010 CL |
1611 | return err; |
1612 | } | |
1613 | ||
ed07536e PZ |
1614 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1615 | static struct lock_class_key xs_key[2]; | |
1616 | static struct lock_class_key xs_slock_key[2]; | |
1617 | ||
8945ee5e | 1618 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1619 | { |
1620 | struct sock *sk = sock->sk; | |
8945ee5e | 1621 | |
02b3d346 | 1622 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1623 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1624 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1625 | } | |
ed07536e | 1626 | |
8945ee5e CL |
1627 | static inline void xs_reclassify_socket6(struct socket *sock) |
1628 | { | |
1629 | struct sock *sk = sock->sk; | |
ed07536e | 1630 | |
f4921aff | 1631 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1632 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1633 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e PZ |
1634 | } |
1635 | #else | |
8945ee5e CL |
1636 | static inline void xs_reclassify_socket4(struct socket *sock) |
1637 | { | |
1638 | } | |
1639 | ||
1640 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1641 | { |
1642 | } | |
1643 | #endif | |
1644 | ||
16be2d20 CL |
1645 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1646 | { | |
1647 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1648 | ||
1649 | if (!transport->inet) { | |
1650 | struct sock *sk = sock->sk; | |
1651 | ||
1652 | write_lock_bh(&sk->sk_callback_lock); | |
1653 | ||
2a9e1cfa TM |
1654 | xs_save_old_callbacks(transport, sk); |
1655 | ||
16be2d20 | 1656 | sk->sk_user_data = xprt; |
16be2d20 CL |
1657 | sk->sk_data_ready = xs_udp_data_ready; |
1658 | sk->sk_write_space = xs_udp_write_space; | |
482f32e6 | 1659 | sk->sk_error_report = xs_error_report; |
16be2d20 CL |
1660 | sk->sk_no_check = UDP_CSUM_NORCV; |
1661 | sk->sk_allocation = GFP_ATOMIC; | |
1662 | ||
1663 | xprt_set_connected(xprt); | |
1664 | ||
1665 | /* Reset to new socket */ | |
1666 | transport->sock = sock; | |
1667 | transport->inet = sk; | |
1668 | ||
1669 | write_unlock_bh(&sk->sk_callback_lock); | |
1670 | } | |
1671 | xs_udp_do_set_buffer_size(xprt); | |
1672 | } | |
1673 | ||
b0d93ad5 | 1674 | /** |
9c3d72de | 1675 | * xs_udp_connect_worker4 - set up a UDP socket |
65f27f38 | 1676 | * @work: RPC transport to connect |
b0d93ad5 CL |
1677 | * |
1678 | * Invoked by a work queue tasklet. | |
1679 | */ | |
9c3d72de | 1680 | static void xs_udp_connect_worker4(struct work_struct *work) |
a246b010 | 1681 | { |
34161db6 TM |
1682 | struct sock_xprt *transport = |
1683 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1684 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1685 | struct socket *sock = transport->sock; |
b0d93ad5 | 1686 | int err, status = -EIO; |
9903cd1c | 1687 | |
01d37c42 | 1688 | if (xprt->shutdown) |
b0d93ad5 | 1689 | goto out; |
9903cd1c | 1690 | |
b0d93ad5 | 1691 | /* Start by resetting any existing state */ |
fe315e76 | 1692 | xs_reset_transport(transport); |
9903cd1c | 1693 | |
fe315e76 CL |
1694 | err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1695 | if (err < 0) { | |
46121cf7 | 1696 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
b0d93ad5 CL |
1697 | goto out; |
1698 | } | |
8945ee5e | 1699 | xs_reclassify_socket4(sock); |
9903cd1c | 1700 | |
7dc753f0 | 1701 | if (xs_bind4(transport, sock)) { |
b0d93ad5 CL |
1702 | sock_release(sock); |
1703 | goto out; | |
1704 | } | |
9903cd1c | 1705 | |
c740eff8 CL |
1706 | dprintk("RPC: worker connecting xprt %p via %s to " |
1707 | "%s (port %s)\n", xprt, | |
1708 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1709 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1710 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 1711 | |
16be2d20 | 1712 | xs_udp_finish_connecting(xprt, sock); |
b0d93ad5 CL |
1713 | status = 0; |
1714 | out: | |
b0d93ad5 | 1715 | xprt_clear_connecting(xprt); |
7d1e8255 | 1716 | xprt_wake_pending_tasks(xprt, status); |
a246b010 | 1717 | } |
a246b010 | 1718 | |
68e220bd CL |
1719 | /** |
1720 | * xs_udp_connect_worker6 - set up a UDP socket | |
1721 | * @work: RPC transport to connect | |
1722 | * | |
1723 | * Invoked by a work queue tasklet. | |
1724 | */ | |
1725 | static void xs_udp_connect_worker6(struct work_struct *work) | |
1726 | { | |
1727 | struct sock_xprt *transport = | |
1728 | container_of(work, struct sock_xprt, connect_worker.work); | |
1729 | struct rpc_xprt *xprt = &transport->xprt; | |
1730 | struct socket *sock = transport->sock; | |
1731 | int err, status = -EIO; | |
a246b010 | 1732 | |
01d37c42 | 1733 | if (xprt->shutdown) |
68e220bd | 1734 | goto out; |
b0d93ad5 | 1735 | |
68e220bd | 1736 | /* Start by resetting any existing state */ |
fe315e76 | 1737 | xs_reset_transport(transport); |
a246b010 | 1738 | |
fe315e76 CL |
1739 | err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); |
1740 | if (err < 0) { | |
68e220bd CL |
1741 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
1742 | goto out; | |
1743 | } | |
8945ee5e | 1744 | xs_reclassify_socket6(sock); |
a246b010 | 1745 | |
68e220bd CL |
1746 | if (xs_bind6(transport, sock) < 0) { |
1747 | sock_release(sock); | |
1748 | goto out; | |
b0d93ad5 | 1749 | } |
68e220bd | 1750 | |
c740eff8 CL |
1751 | dprintk("RPC: worker connecting xprt %p via %s to " |
1752 | "%s (port %s)\n", xprt, | |
1753 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1754 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1755 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
1756 | |
1757 | xs_udp_finish_connecting(xprt, sock); | |
b0d93ad5 CL |
1758 | status = 0; |
1759 | out: | |
b0d93ad5 | 1760 | xprt_clear_connecting(xprt); |
7d1e8255 | 1761 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
1762 | } |
1763 | ||
3167e12c CL |
1764 | /* |
1765 | * We need to preserve the port number so the reply cache on the server can | |
1766 | * find our cached RPC replies when we get around to reconnecting. | |
1767 | */ | |
40d2549d | 1768 | static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
3167e12c CL |
1769 | { |
1770 | int result; | |
3167e12c CL |
1771 | struct sockaddr any; |
1772 | ||
46121cf7 | 1773 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
3167e12c CL |
1774 | |
1775 | /* | |
1776 | * Disconnect the transport socket by doing a connect operation | |
1777 | * with AF_UNSPEC. This should return immediately... | |
1778 | */ | |
1779 | memset(&any, 0, sizeof(any)); | |
1780 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1781 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
7d1e8255 TM |
1782 | if (!result) |
1783 | xs_sock_mark_closed(xprt); | |
1784 | else | |
46121cf7 | 1785 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
1786 | result); |
1787 | } | |
1788 | ||
40d2549d TM |
1789 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) |
1790 | { | |
1791 | unsigned int state = transport->inet->sk_state; | |
1792 | ||
1793 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) | |
1794 | return; | |
1795 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) | |
1796 | return; | |
1797 | xs_abort_connection(xprt, transport); | |
1798 | } | |
1799 | ||
16be2d20 | 1800 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 1801 | { |
16be2d20 | 1802 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
edb267a6 | 1803 | |
ee0ac0c2 | 1804 | if (!transport->inet) { |
b0d93ad5 CL |
1805 | struct sock *sk = sock->sk; |
1806 | ||
1807 | write_lock_bh(&sk->sk_callback_lock); | |
1808 | ||
2a9e1cfa TM |
1809 | xs_save_old_callbacks(transport, sk); |
1810 | ||
b0d93ad5 | 1811 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
1812 | sk->sk_data_ready = xs_tcp_data_ready; |
1813 | sk->sk_state_change = xs_tcp_state_change; | |
1814 | sk->sk_write_space = xs_tcp_write_space; | |
482f32e6 | 1815 | sk->sk_error_report = xs_error_report; |
b079fa7b | 1816 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1817 | |
1818 | /* socket options */ | |
1819 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1820 | sock_reset_flag(sk, SOCK_LINGER); | |
1821 | tcp_sk(sk)->linger2 = 0; | |
1822 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1823 | |
1824 | xprt_clear_connected(xprt); | |
1825 | ||
1826 | /* Reset to new socket */ | |
ee0ac0c2 CL |
1827 | transport->sock = sock; |
1828 | transport->inet = sk; | |
b0d93ad5 CL |
1829 | |
1830 | write_unlock_bh(&sk->sk_callback_lock); | |
1831 | } | |
1832 | ||
01d37c42 TM |
1833 | if (!xprt_bound(xprt)) |
1834 | return -ENOTCONN; | |
1835 | ||
b0d93ad5 | 1836 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
1837 | xprt->stat.connect_count++; |
1838 | xprt->stat.connect_start = jiffies; | |
95392c59 | 1839 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
16be2d20 CL |
1840 | } |
1841 | ||
9903cd1c | 1842 | /** |
b61d59ff TM |
1843 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
1844 | * @xprt: RPC transport to connect | |
1845 | * @transport: socket transport to connect | |
1846 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
1847 | * |
1848 | * Invoked by a work queue tasklet. | |
a246b010 | 1849 | */ |
b61d59ff TM |
1850 | static void xs_tcp_setup_socket(struct rpc_xprt *xprt, |
1851 | struct sock_xprt *transport, | |
1852 | struct socket *(*create_sock)(struct rpc_xprt *, | |
1853 | struct sock_xprt *)) | |
a246b010 | 1854 | { |
ee0ac0c2 | 1855 | struct socket *sock = transport->sock; |
b61d59ff | 1856 | int status = -EIO; |
a246b010 | 1857 | |
01d37c42 | 1858 | if (xprt->shutdown) |
a246b010 CL |
1859 | goto out; |
1860 | ||
ee0ac0c2 | 1861 | if (!sock) { |
7d1e8255 | 1862 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
b61d59ff TM |
1863 | sock = create_sock(xprt, transport); |
1864 | if (IS_ERR(sock)) { | |
1865 | status = PTR_ERR(sock); | |
3167e12c CL |
1866 | goto out; |
1867 | } | |
7d1e8255 TM |
1868 | } else { |
1869 | int abort_and_exit; | |
a246b010 | 1870 | |
7d1e8255 TM |
1871 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
1872 | &xprt->state); | |
3167e12c | 1873 | /* "close" the socket, preserving the local port */ |
40d2549d | 1874 | xs_tcp_reuse_connection(xprt, transport); |
a246b010 | 1875 | |
7d1e8255 TM |
1876 | if (abort_and_exit) |
1877 | goto out_eagain; | |
1878 | } | |
a246b010 | 1879 | |
c740eff8 CL |
1880 | dprintk("RPC: worker connecting xprt %p via %s to " |
1881 | "%s (port %s)\n", xprt, | |
1882 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
1883 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
1884 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 1885 | |
16be2d20 | 1886 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 CL |
1887 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1888 | xprt, -status, xprt_connected(xprt), | |
1889 | sock->sk->sk_state); | |
2a491991 | 1890 | switch (status) { |
f75e6745 TM |
1891 | default: |
1892 | printk("%s: connect returned unhandled error %d\n", | |
1893 | __func__, status); | |
1894 | case -EADDRNOTAVAIL: | |
1895 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
1896 | * and retry | |
1897 | */ | |
1898 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
1899 | xprt_force_disconnect(xprt); | |
88b5ed73 | 1900 | break; |
8a2cec29 TM |
1901 | case -ECONNREFUSED: |
1902 | case -ECONNRESET: | |
1903 | case -ENETUNREACH: | |
1904 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
1905 | case 0: |
1906 | case -EINPROGRESS: | |
1907 | case -EALREADY: | |
7d1e8255 TM |
1908 | xprt_clear_connecting(xprt); |
1909 | return; | |
9fcfe0c8 TM |
1910 | case -EINVAL: |
1911 | /* Happens, for instance, if the user specified a link | |
1912 | * local IPv6 address without a scope-id. | |
1913 | */ | |
1914 | goto out; | |
a246b010 | 1915 | } |
7d1e8255 | 1916 | out_eagain: |
2a491991 | 1917 | status = -EAGAIN; |
a246b010 | 1918 | out: |
68e220bd | 1919 | xprt_clear_connecting(xprt); |
7d1e8255 | 1920 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 1921 | } |
b0d93ad5 | 1922 | |
b61d59ff TM |
1923 | static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, |
1924 | struct sock_xprt *transport) | |
1925 | { | |
1926 | struct socket *sock; | |
1927 | int err; | |
1928 | ||
1929 | /* start from scratch */ | |
1930 | err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1931 | if (err < 0) { | |
1932 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
1933 | -err); | |
1934 | goto out_err; | |
1935 | } | |
1936 | xs_reclassify_socket4(sock); | |
1937 | ||
1938 | if (xs_bind4(transport, sock) < 0) { | |
1939 | sock_release(sock); | |
1940 | goto out_err; | |
1941 | } | |
1942 | return sock; | |
1943 | out_err: | |
1944 | return ERR_PTR(-EIO); | |
68e220bd | 1945 | } |
b0d93ad5 | 1946 | |
68e220bd | 1947 | /** |
b61d59ff | 1948 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
68e220bd CL |
1949 | * @work: RPC transport to connect |
1950 | * | |
1951 | * Invoked by a work queue tasklet. | |
1952 | */ | |
b61d59ff | 1953 | static void xs_tcp_connect_worker4(struct work_struct *work) |
68e220bd CL |
1954 | { |
1955 | struct sock_xprt *transport = | |
1956 | container_of(work, struct sock_xprt, connect_worker.work); | |
1957 | struct rpc_xprt *xprt = &transport->xprt; | |
3167e12c | 1958 | |
b61d59ff TM |
1959 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); |
1960 | } | |
b0d93ad5 | 1961 | |
b61d59ff TM |
1962 | static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, |
1963 | struct sock_xprt *transport) | |
1964 | { | |
1965 | struct socket *sock; | |
1966 | int err; | |
7d1e8255 | 1967 | |
b61d59ff TM |
1968 | /* start from scratch */ |
1969 | err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1970 | if (err < 0) { | |
1971 | dprintk("RPC: can't create TCP transport socket (%d).\n", | |
1972 | -err); | |
1973 | goto out_err; | |
1974 | } | |
1975 | xs_reclassify_socket6(sock); | |
b0d93ad5 | 1976 | |
b61d59ff TM |
1977 | if (xs_bind6(transport, sock) < 0) { |
1978 | sock_release(sock); | |
1979 | goto out_err; | |
7d1e8255 | 1980 | } |
b61d59ff TM |
1981 | return sock; |
1982 | out_err: | |
1983 | return ERR_PTR(-EIO); | |
1984 | } | |
b0d93ad5 | 1985 | |
b61d59ff TM |
1986 | /** |
1987 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint | |
1988 | * @work: RPC transport to connect | |
1989 | * | |
1990 | * Invoked by a work queue tasklet. | |
1991 | */ | |
1992 | static void xs_tcp_connect_worker6(struct work_struct *work) | |
1993 | { | |
1994 | struct sock_xprt *transport = | |
1995 | container_of(work, struct sock_xprt, connect_worker.work); | |
1996 | struct rpc_xprt *xprt = &transport->xprt; | |
b0d93ad5 | 1997 | |
b61d59ff | 1998 | xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); |
a246b010 CL |
1999 | } |
2000 | ||
9903cd1c CL |
2001 | /** |
2002 | * xs_connect - connect a socket to a remote endpoint | |
2003 | * @task: address of RPC task that manages state of connect request | |
2004 | * | |
2005 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2006 | * |
2007 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2008 | * to guarantee that even unprivileged user processes can set up a | |
2009 | * socket on a privileged port. | |
2010 | * | |
2011 | * If a UDP socket connect fails, the delay behavior here prevents | |
2012 | * retry floods (hard mounts). | |
9903cd1c CL |
2013 | */ |
2014 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
2015 | { |
2016 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 2017 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2018 | |
b0d93ad5 CL |
2019 | if (xprt_test_and_set_connecting(xprt)) |
2020 | return; | |
2021 | ||
09a21c41 | 2022 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
46121cf7 CL |
2023 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2024 | "seconds\n", | |
03bf4b70 | 2025 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2026 | queue_delayed_work(rpciod_workqueue, |
2027 | &transport->connect_worker, | |
2028 | xprt->reestablish_timeout); | |
03bf4b70 | 2029 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2030 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2031 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2032 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2033 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2034 | } else { |
46121cf7 | 2035 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2036 | queue_delayed_work(rpciod_workqueue, |
2037 | &transport->connect_worker, 0); | |
a246b010 CL |
2038 | } |
2039 | } | |
2040 | ||
e06799f9 TM |
2041 | static void xs_tcp_connect(struct rpc_task *task) |
2042 | { | |
2043 | struct rpc_xprt *xprt = task->tk_xprt; | |
2044 | ||
e06799f9 TM |
2045 | /* Exit if we need to wait for socket shutdown to complete */ |
2046 | if (test_bit(XPRT_CLOSING, &xprt->state)) | |
2047 | return; | |
2048 | xs_connect(task); | |
2049 | } | |
2050 | ||
262ca07d CL |
2051 | /** |
2052 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2053 | * @xprt: rpc_xprt struct containing statistics | |
2054 | * @seq: output file | |
2055 | * | |
2056 | */ | |
2057 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2058 | { | |
c8475461 CL |
2059 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2060 | ||
262ca07d | 2061 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
fbfffbd5 | 2062 | transport->srcport, |
262ca07d CL |
2063 | xprt->stat.bind_count, |
2064 | xprt->stat.sends, | |
2065 | xprt->stat.recvs, | |
2066 | xprt->stat.bad_xids, | |
2067 | xprt->stat.req_u, | |
2068 | xprt->stat.bklog_u); | |
2069 | } | |
2070 | ||
2071 | /** | |
2072 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2073 | * @xprt: rpc_xprt struct containing statistics | |
2074 | * @seq: output file | |
2075 | * | |
2076 | */ | |
2077 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2078 | { | |
c8475461 | 2079 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2080 | long idle_time = 0; |
2081 | ||
2082 | if (xprt_connected(xprt)) | |
2083 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2084 | ||
2085 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
fbfffbd5 | 2086 | transport->srcport, |
262ca07d CL |
2087 | xprt->stat.bind_count, |
2088 | xprt->stat.connect_count, | |
2089 | xprt->stat.connect_time, | |
2090 | idle_time, | |
2091 | xprt->stat.sends, | |
2092 | xprt->stat.recvs, | |
2093 | xprt->stat.bad_xids, | |
2094 | xprt->stat.req_u, | |
2095 | xprt->stat.bklog_u); | |
2096 | } | |
2097 | ||
4cfc7e60 RI |
2098 | /* |
2099 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2100 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2101 | * to use the server side send routines. | |
2102 | */ | |
5a51f13a | 2103 | static void *bc_malloc(struct rpc_task *task, size_t size) |
4cfc7e60 RI |
2104 | { |
2105 | struct page *page; | |
2106 | struct rpc_buffer *buf; | |
2107 | ||
2108 | BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); | |
2109 | page = alloc_page(GFP_KERNEL); | |
2110 | ||
2111 | if (!page) | |
2112 | return NULL; | |
2113 | ||
2114 | buf = page_address(page); | |
2115 | buf->len = PAGE_SIZE; | |
2116 | ||
2117 | return buf->data; | |
2118 | } | |
2119 | ||
2120 | /* | |
2121 | * Free the space allocated in the bc_alloc routine | |
2122 | */ | |
5a51f13a | 2123 | static void bc_free(void *buffer) |
4cfc7e60 RI |
2124 | { |
2125 | struct rpc_buffer *buf; | |
2126 | ||
2127 | if (!buffer) | |
2128 | return; | |
2129 | ||
2130 | buf = container_of(buffer, struct rpc_buffer, data); | |
2131 | free_page((unsigned long)buf); | |
2132 | } | |
2133 | ||
2134 | /* | |
2135 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2136 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2137 | */ | |
2138 | static int bc_sendto(struct rpc_rqst *req) | |
2139 | { | |
2140 | int len; | |
2141 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2142 | struct rpc_xprt *xprt = req->rq_xprt; | |
2143 | struct sock_xprt *transport = | |
2144 | container_of(xprt, struct sock_xprt, xprt); | |
2145 | struct socket *sock = transport->sock; | |
2146 | unsigned long headoff; | |
2147 | unsigned long tailoff; | |
2148 | ||
2149 | /* | |
2150 | * Set up the rpc header and record marker stuff | |
2151 | */ | |
2152 | xs_encode_tcp_record_marker(xbufp); | |
2153 | ||
2154 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2155 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2156 | len = svc_send_common(sock, xbufp, | |
2157 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2158 | xbufp->tail[0].iov_base, tailoff); | |
2159 | ||
2160 | if (len != xbufp->len) { | |
2161 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2162 | len = -EAGAIN; | |
2163 | } | |
2164 | ||
2165 | return len; | |
2166 | } | |
2167 | ||
2168 | /* | |
2169 | * The send routine. Borrows from svc_send | |
2170 | */ | |
2171 | static int bc_send_request(struct rpc_task *task) | |
2172 | { | |
2173 | struct rpc_rqst *req = task->tk_rqstp; | |
2174 | struct svc_xprt *xprt; | |
2175 | struct svc_sock *svsk; | |
2176 | u32 len; | |
2177 | ||
2178 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2179 | /* | |
2180 | * Get the server socket associated with this callback xprt | |
2181 | */ | |
2182 | xprt = req->rq_xprt->bc_xprt; | |
2183 | svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
2184 | ||
2185 | /* | |
2186 | * Grab the mutex to serialize data as the connection is shared | |
2187 | * with the fore channel | |
2188 | */ | |
2189 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2190 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2191 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2192 | return -EAGAIN; | |
2193 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2194 | } | |
2195 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2196 | len = -ENOTCONN; | |
2197 | else | |
2198 | len = bc_sendto(req); | |
2199 | mutex_unlock(&xprt->xpt_mutex); | |
2200 | ||
2201 | if (len > 0) | |
2202 | len = 0; | |
2203 | ||
2204 | return len; | |
2205 | } | |
2206 | ||
2207 | /* | |
2208 | * The close routine. Since this is client initiated, we do nothing | |
2209 | */ | |
2210 | ||
2211 | static void bc_close(struct rpc_xprt *xprt) | |
2212 | { | |
2213 | return; | |
2214 | } | |
2215 | ||
2216 | /* | |
2217 | * The xprt destroy routine. Again, because this connection is client | |
2218 | * initiated, we do nothing | |
2219 | */ | |
2220 | ||
2221 | static void bc_destroy(struct rpc_xprt *xprt) | |
2222 | { | |
2223 | return; | |
2224 | } | |
2225 | ||
262965f5 | 2226 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2227 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2228 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2229 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 2230 | .rpcbind = rpcb_getport_async, |
92200412 | 2231 | .set_port = xs_set_port, |
262965f5 | 2232 | .connect = xs_connect, |
02107148 CL |
2233 | .buf_alloc = rpc_malloc, |
2234 | .buf_free = rpc_free, | |
262965f5 | 2235 | .send_request = xs_udp_send_request, |
fe3aca29 | 2236 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2237 | .timer = xs_udp_timer, |
a58dd398 | 2238 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2239 | .close = xs_close, |
2240 | .destroy = xs_destroy, | |
262ca07d | 2241 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2242 | }; |
2243 | ||
2244 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2245 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2246 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 2247 | .rpcbind = rpcb_getport_async, |
92200412 | 2248 | .set_port = xs_set_port, |
e06799f9 | 2249 | .connect = xs_tcp_connect, |
02107148 CL |
2250 | .buf_alloc = rpc_malloc, |
2251 | .buf_free = rpc_free, | |
262965f5 | 2252 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2253 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
f75e6745 | 2254 | .close = xs_tcp_close, |
9903cd1c | 2255 | .destroy = xs_destroy, |
262ca07d | 2256 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2257 | }; |
2258 | ||
4cfc7e60 RI |
2259 | /* |
2260 | * The rpc_xprt_ops for the server backchannel | |
2261 | */ | |
2262 | ||
2263 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2264 | .reserve_xprt = xprt_reserve_xprt, | |
2265 | .release_xprt = xprt_release_xprt, | |
2266 | .buf_alloc = bc_malloc, | |
2267 | .buf_free = bc_free, | |
2268 | .send_request = bc_send_request, | |
2269 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2270 | .close = bc_close, | |
2271 | .destroy = bc_destroy, | |
2272 | .print_stats = xs_tcp_print_stats, | |
2273 | }; | |
2274 | ||
3c341b0b | 2275 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
bc25571e | 2276 | unsigned int slot_table_size) |
c8541ecd CL |
2277 | { |
2278 | struct rpc_xprt *xprt; | |
ffc2e518 | 2279 | struct sock_xprt *new; |
c8541ecd | 2280 | |
96802a09 | 2281 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2282 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2283 | return ERR_PTR(-EBADF); |
2284 | } | |
2285 | ||
ffc2e518 CL |
2286 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
2287 | if (new == NULL) { | |
46121cf7 CL |
2288 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2289 | "rpc_xprt\n"); | |
c8541ecd CL |
2290 | return ERR_PTR(-ENOMEM); |
2291 | } | |
ffc2e518 | 2292 | xprt = &new->xprt; |
c8541ecd CL |
2293 | |
2294 | xprt->max_reqs = slot_table_size; | |
2295 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); | |
2296 | if (xprt->slot == NULL) { | |
2297 | kfree(xprt); | |
46121cf7 CL |
2298 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
2299 | "table\n"); | |
c8541ecd CL |
2300 | return ERR_PTR(-ENOMEM); |
2301 | } | |
2302 | ||
96802a09 FM |
2303 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2304 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2305 | if (args->srcaddr) |
fbfffbd5 | 2306 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
c8541ecd CL |
2307 | |
2308 | return xprt; | |
2309 | } | |
2310 | ||
2881ae74 TM |
2311 | static const struct rpc_timeout xs_udp_default_timeout = { |
2312 | .to_initval = 5 * HZ, | |
2313 | .to_maxval = 30 * HZ, | |
2314 | .to_increment = 5 * HZ, | |
2315 | .to_retries = 5, | |
2316 | }; | |
2317 | ||
9903cd1c CL |
2318 | /** |
2319 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2320 | * @args: rpc transport creation arguments |
9903cd1c CL |
2321 | * |
2322 | */ | |
483066d6 | 2323 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2324 | { |
8f9d5b1a | 2325 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2326 | struct rpc_xprt *xprt; |
c8475461 | 2327 | struct sock_xprt *transport; |
a246b010 | 2328 | |
96802a09 | 2329 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
2330 | if (IS_ERR(xprt)) |
2331 | return xprt; | |
c8475461 | 2332 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2333 | |
ec739ef0 | 2334 | xprt->prot = IPPROTO_UDP; |
808012fb | 2335 | xprt->tsh_size = 0; |
a246b010 CL |
2336 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2337 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2338 | ||
03bf4b70 CL |
2339 | xprt->bind_timeout = XS_BIND_TO; |
2340 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
2341 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
2342 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2343 | |
262965f5 | 2344 | xprt->ops = &xs_udp_ops; |
a246b010 | 2345 | |
ba7392bb | 2346 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2347 | |
8f9d5b1a CL |
2348 | switch (addr->sa_family) { |
2349 | case AF_INET: | |
2350 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2351 | xprt_set_bound(xprt); | |
2352 | ||
2353 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2354 | xs_udp_connect_worker4); | |
9dc3b095 | 2355 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2356 | break; |
2357 | case AF_INET6: | |
2358 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2359 | xprt_set_bound(xprt); | |
2360 | ||
2361 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2362 | xs_udp_connect_worker6); | |
9dc3b095 | 2363 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2364 | break; |
2365 | default: | |
2366 | kfree(xprt); | |
2367 | return ERR_PTR(-EAFNOSUPPORT); | |
2368 | } | |
2369 | ||
c740eff8 CL |
2370 | if (xprt_bound(xprt)) |
2371 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2372 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2373 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2374 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2375 | else | |
2376 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2377 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2378 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2379 | |
bc25571e TT |
2380 | if (try_module_get(THIS_MODULE)) |
2381 | return xprt; | |
2382 | ||
2383 | kfree(xprt->slot); | |
2384 | kfree(xprt); | |
2385 | return ERR_PTR(-EINVAL); | |
a246b010 CL |
2386 | } |
2387 | ||
2881ae74 TM |
2388 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2389 | .to_initval = 60 * HZ, | |
2390 | .to_maxval = 60 * HZ, | |
2391 | .to_retries = 2, | |
2392 | }; | |
2393 | ||
9903cd1c CL |
2394 | /** |
2395 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2396 | * @args: rpc transport creation arguments |
9903cd1c CL |
2397 | * |
2398 | */ | |
483066d6 | 2399 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2400 | { |
8f9d5b1a | 2401 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2402 | struct rpc_xprt *xprt; |
c8475461 | 2403 | struct sock_xprt *transport; |
a246b010 | 2404 | |
96802a09 | 2405 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
2406 | if (IS_ERR(xprt)) |
2407 | return xprt; | |
c8475461 | 2408 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2409 | |
ec739ef0 | 2410 | xprt->prot = IPPROTO_TCP; |
808012fb | 2411 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2412 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2413 | |
03bf4b70 CL |
2414 | xprt->bind_timeout = XS_BIND_TO; |
2415 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
2416 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2417 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2418 | |
262965f5 | 2419 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2420 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2421 | |
8f9d5b1a CL |
2422 | switch (addr->sa_family) { |
2423 | case AF_INET: | |
2424 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2425 | xprt_set_bound(xprt); | |
2426 | ||
9dc3b095 CL |
2427 | INIT_DELAYED_WORK(&transport->connect_worker, |
2428 | xs_tcp_connect_worker4); | |
2429 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); | |
8f9d5b1a CL |
2430 | break; |
2431 | case AF_INET6: | |
2432 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2433 | xprt_set_bound(xprt); | |
2434 | ||
9dc3b095 CL |
2435 | INIT_DELAYED_WORK(&transport->connect_worker, |
2436 | xs_tcp_connect_worker6); | |
2437 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); | |
8f9d5b1a CL |
2438 | break; |
2439 | default: | |
2440 | kfree(xprt); | |
2441 | return ERR_PTR(-EAFNOSUPPORT); | |
2442 | } | |
2443 | ||
c740eff8 CL |
2444 | if (xprt_bound(xprt)) |
2445 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2446 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2447 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2448 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2449 | else | |
2450 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2451 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2452 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2453 | ||
edb267a6 | 2454 | |
bc25571e TT |
2455 | if (try_module_get(THIS_MODULE)) |
2456 | return xprt; | |
2457 | ||
2458 | kfree(xprt->slot); | |
2459 | kfree(xprt); | |
2460 | return ERR_PTR(-EINVAL); | |
a246b010 | 2461 | } |
282b32e1 | 2462 | |
f300baba AB |
2463 | /** |
2464 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2465 | * @args: rpc transport creation arguments | |
2466 | * | |
2467 | */ | |
2468 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2469 | { | |
2470 | struct sockaddr *addr = args->dstaddr; | |
2471 | struct rpc_xprt *xprt; | |
2472 | struct sock_xprt *transport; | |
2473 | struct svc_sock *bc_sock; | |
2474 | ||
2475 | if (!args->bc_xprt) | |
2476 | ERR_PTR(-EINVAL); | |
2477 | ||
2478 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); | |
2479 | if (IS_ERR(xprt)) | |
2480 | return xprt; | |
2481 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2482 | ||
2483 | xprt->prot = IPPROTO_TCP; | |
2484 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2485 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2486 | xprt->timeout = &xs_tcp_default_timeout; | |
2487 | ||
2488 | /* backchannel */ | |
2489 | xprt_set_bound(xprt); | |
2490 | xprt->bind_timeout = 0; | |
2491 | xprt->connect_timeout = 0; | |
2492 | xprt->reestablish_timeout = 0; | |
2493 | xprt->idle_timeout = 0; | |
2494 | ||
2495 | /* | |
2496 | * The backchannel uses the same socket connection as the | |
2497 | * forechannel | |
2498 | */ | |
2499 | xprt->bc_xprt = args->bc_xprt; | |
2500 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
2501 | bc_sock->sk_bc_xprt = xprt; | |
2502 | transport->sock = bc_sock->sk_sock; | |
2503 | transport->inet = bc_sock->sk_sk; | |
2504 | ||
2505 | xprt->ops = &bc_tcp_ops; | |
2506 | ||
2507 | switch (addr->sa_family) { | |
2508 | case AF_INET: | |
2509 | xs_format_peer_addresses(xprt, "tcp", | |
2510 | RPCBIND_NETID_TCP); | |
2511 | break; | |
2512 | case AF_INET6: | |
2513 | xs_format_peer_addresses(xprt, "tcp", | |
2514 | RPCBIND_NETID_TCP6); | |
2515 | break; | |
2516 | default: | |
2517 | kfree(xprt); | |
2518 | return ERR_PTR(-EAFNOSUPPORT); | |
2519 | } | |
2520 | ||
2521 | if (xprt_bound(xprt)) | |
2522 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2523 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2524 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2525 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2526 | else | |
2527 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2528 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2529 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2530 | ||
2531 | /* | |
2532 | * Since we don't want connections for the backchannel, we set | |
2533 | * the xprt status to connected | |
2534 | */ | |
2535 | xprt_set_connected(xprt); | |
2536 | ||
2537 | ||
2538 | if (try_module_get(THIS_MODULE)) | |
2539 | return xprt; | |
2540 | kfree(xprt->slot); | |
2541 | kfree(xprt); | |
2542 | return ERR_PTR(-EINVAL); | |
2543 | } | |
2544 | ||
bc25571e TT |
2545 | static struct xprt_class xs_udp_transport = { |
2546 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2547 | .name = "udp", | |
2548 | .owner = THIS_MODULE, | |
f300baba | 2549 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
2550 | .setup = xs_setup_udp, |
2551 | }; | |
2552 | ||
2553 | static struct xprt_class xs_tcp_transport = { | |
2554 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2555 | .name = "tcp", | |
2556 | .owner = THIS_MODULE, | |
f300baba | 2557 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
2558 | .setup = xs_setup_tcp, |
2559 | }; | |
2560 | ||
f300baba AB |
2561 | static struct xprt_class xs_bc_tcp_transport = { |
2562 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
2563 | .name = "tcp NFSv4.1 backchannel", | |
2564 | .owner = THIS_MODULE, | |
2565 | .ident = XPRT_TRANSPORT_BC_TCP, | |
2566 | .setup = xs_setup_bc_tcp, | |
2567 | }; | |
2568 | ||
282b32e1 | 2569 | /** |
bc25571e | 2570 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2571 | * |
2572 | */ | |
2573 | int init_socket_xprt(void) | |
2574 | { | |
fbf76683 | 2575 | #ifdef RPC_DEBUG |
2b1bec5f | 2576 | if (!sunrpc_table_header) |
0b4d4147 | 2577 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2578 | #endif |
2579 | ||
bc25571e TT |
2580 | xprt_register_transport(&xs_udp_transport); |
2581 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 2582 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 2583 | |
282b32e1 CL |
2584 | return 0; |
2585 | } | |
2586 | ||
2587 | /** | |
bc25571e | 2588 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2589 | * |
2590 | */ | |
2591 | void cleanup_socket_xprt(void) | |
2592 | { | |
fbf76683 CL |
2593 | #ifdef RPC_DEBUG |
2594 | if (sunrpc_table_header) { | |
2595 | unregister_sysctl_table(sunrpc_table_header); | |
2596 | sunrpc_table_header = NULL; | |
2597 | } | |
2598 | #endif | |
bc25571e TT |
2599 | |
2600 | xprt_unregister_transport(&xs_udp_transport); | |
2601 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 2602 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 2603 | } |
cbf11071 TM |
2604 | |
2605 | static int param_set_uint_minmax(const char *val, struct kernel_param *kp, | |
2606 | unsigned int min, unsigned int max) | |
2607 | { | |
2608 | unsigned long num; | |
2609 | int ret; | |
2610 | ||
2611 | if (!val) | |
2612 | return -EINVAL; | |
2613 | ret = strict_strtoul(val, 0, &num); | |
2614 | if (ret == -EINVAL || num < min || num > max) | |
2615 | return -EINVAL; | |
2616 | *((unsigned int *)kp->arg) = num; | |
2617 | return 0; | |
2618 | } | |
2619 | ||
2620 | static int param_set_portnr(const char *val, struct kernel_param *kp) | |
2621 | { | |
2622 | return param_set_uint_minmax(val, kp, | |
2623 | RPC_MIN_RESVPORT, | |
2624 | RPC_MAX_RESVPORT); | |
2625 | } | |
2626 | ||
2627 | static int param_get_portnr(char *buffer, struct kernel_param *kp) | |
2628 | { | |
2629 | return param_get_uint(buffer, kp); | |
2630 | } | |
2631 | #define param_check_portnr(name, p) \ | |
2632 | __param_check(name, p, unsigned int); | |
2633 | ||
2634 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
2635 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
2636 | ||
2637 | static int param_set_slot_table_size(const char *val, struct kernel_param *kp) | |
2638 | { | |
2639 | return param_set_uint_minmax(val, kp, | |
2640 | RPC_MIN_SLOT_TABLE, | |
2641 | RPC_MAX_SLOT_TABLE); | |
2642 | } | |
2643 | ||
2644 | static int param_get_slot_table_size(char *buffer, struct kernel_param *kp) | |
2645 | { | |
2646 | return param_get_uint(buffer, kp); | |
2647 | } | |
2648 | #define param_check_slot_table_size(name, p) \ | |
2649 | __param_check(name, p, unsigned int); | |
2650 | ||
2651 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, | |
2652 | slot_table_size, 0644); | |
2653 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, | |
2654 | slot_table_size, 0644); | |
2655 |