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Commit | Line | Data |
---|---|---|
a246b010 CL |
1 | /* |
2 | * linux/net/sunrpc/xprtsock.c | |
3 | * | |
4 | * Client-side transport implementation for sockets. | |
5 | * | |
113aa838 AC |
6 | * TCP callback races fixes (C) 1998 Red Hat |
7 | * TCP send fixes (C) 1998 Red Hat | |
a246b010 CL |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> | |
10 | * | |
11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. | |
12 | * Fix behaviour when socket buffer is full. | |
13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
176e21ee | 22 | #include <linux/string.h> |
a246b010 | 23 | #include <linux/slab.h> |
bc25571e | 24 | #include <linux/module.h> |
a246b010 | 25 | #include <linux/capability.h> |
a246b010 CL |
26 | #include <linux/pagemap.h> |
27 | #include <linux/errno.h> | |
28 | #include <linux/socket.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/mm.h> | |
176e21ee | 32 | #include <linux/un.h> |
a246b010 CL |
33 | #include <linux/udp.h> |
34 | #include <linux/tcp.h> | |
35 | #include <linux/sunrpc/clnt.h> | |
02107148 | 36 | #include <linux/sunrpc/sched.h> |
4cfc7e60 | 37 | #include <linux/sunrpc/svcsock.h> |
49c36fcc | 38 | #include <linux/sunrpc/xprtsock.h> |
a246b010 | 39 | #include <linux/file.h> |
9e00abc3 | 40 | #ifdef CONFIG_SUNRPC_BACKCHANNEL |
44b98efd RL |
41 | #include <linux/sunrpc/bc_xprt.h> |
42 | #endif | |
a246b010 CL |
43 | |
44 | #include <net/sock.h> | |
45 | #include <net/checksum.h> | |
46 | #include <net/udp.h> | |
47 | #include <net/tcp.h> | |
48 | ||
4cfc7e60 | 49 | #include "sunrpc.h" |
176e21ee CL |
50 | |
51 | static void xs_close(struct rpc_xprt *xprt); | |
52 | ||
c556b754 CL |
53 | /* |
54 | * xprtsock tunables | |
55 | */ | |
09acfea5 TM |
56 | static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
57 | static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; | |
58 | static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; | |
c556b754 | 59 | |
09acfea5 TM |
60 | static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; |
61 | static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
c556b754 | 62 | |
7d1e8255 | 63 | #define XS_TCP_LINGER_TO (15U * HZ) |
25fe6142 | 64 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
7d1e8255 | 65 | |
fbf76683 CL |
66 | /* |
67 | * We can register our own files under /proc/sys/sunrpc by | |
68 | * calling register_sysctl_table() again. The files in that | |
69 | * directory become the union of all files registered there. | |
70 | * | |
71 | * We simply need to make sure that we don't collide with | |
72 | * someone else's file names! | |
73 | */ | |
74 | ||
75 | #ifdef RPC_DEBUG | |
76 | ||
77 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
78 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
d9ba131d | 79 | static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; |
fbf76683 CL |
80 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; |
81 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
82 | ||
83 | static struct ctl_table_header *sunrpc_table_header; | |
84 | ||
85 | /* | |
86 | * FIXME: changing the UDP slot table size should also resize the UDP | |
87 | * socket buffers for existing UDP transports | |
88 | */ | |
89 | static ctl_table xs_tunables_table[] = { | |
90 | { | |
fbf76683 CL |
91 | .procname = "udp_slot_table_entries", |
92 | .data = &xprt_udp_slot_table_entries, | |
93 | .maxlen = sizeof(unsigned int), | |
94 | .mode = 0644, | |
6d456111 | 95 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
96 | .extra1 = &min_slot_table_size, |
97 | .extra2 = &max_slot_table_size | |
98 | }, | |
99 | { | |
fbf76683 CL |
100 | .procname = "tcp_slot_table_entries", |
101 | .data = &xprt_tcp_slot_table_entries, | |
102 | .maxlen = sizeof(unsigned int), | |
103 | .mode = 0644, | |
6d456111 | 104 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
105 | .extra1 = &min_slot_table_size, |
106 | .extra2 = &max_slot_table_size | |
107 | }, | |
d9ba131d TM |
108 | { |
109 | .procname = "tcp_max_slot_table_entries", | |
110 | .data = &xprt_max_tcp_slot_table_entries, | |
111 | .maxlen = sizeof(unsigned int), | |
112 | .mode = 0644, | |
113 | .proc_handler = proc_dointvec_minmax, | |
114 | .extra1 = &min_slot_table_size, | |
115 | .extra2 = &max_tcp_slot_table_limit | |
116 | }, | |
fbf76683 | 117 | { |
fbf76683 CL |
118 | .procname = "min_resvport", |
119 | .data = &xprt_min_resvport, | |
120 | .maxlen = sizeof(unsigned int), | |
121 | .mode = 0644, | |
6d456111 | 122 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
123 | .extra1 = &xprt_min_resvport_limit, |
124 | .extra2 = &xprt_max_resvport_limit | |
125 | }, | |
126 | { | |
fbf76683 CL |
127 | .procname = "max_resvport", |
128 | .data = &xprt_max_resvport, | |
129 | .maxlen = sizeof(unsigned int), | |
130 | .mode = 0644, | |
6d456111 | 131 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
132 | .extra1 = &xprt_min_resvport_limit, |
133 | .extra2 = &xprt_max_resvport_limit | |
134 | }, | |
25fe6142 TM |
135 | { |
136 | .procname = "tcp_fin_timeout", | |
137 | .data = &xs_tcp_fin_timeout, | |
138 | .maxlen = sizeof(xs_tcp_fin_timeout), | |
139 | .mode = 0644, | |
6d456111 | 140 | .proc_handler = proc_dointvec_jiffies, |
fbf76683 | 141 | }, |
f8572d8f | 142 | { }, |
fbf76683 CL |
143 | }; |
144 | ||
145 | static ctl_table sunrpc_table[] = { | |
146 | { | |
fbf76683 CL |
147 | .procname = "sunrpc", |
148 | .mode = 0555, | |
149 | .child = xs_tunables_table | |
150 | }, | |
f8572d8f | 151 | { }, |
fbf76683 CL |
152 | }; |
153 | ||
154 | #endif | |
155 | ||
03bf4b70 CL |
156 | /* |
157 | * Wait duration for a reply from the RPC portmapper. | |
158 | */ | |
159 | #define XS_BIND_TO (60U * HZ) | |
160 | ||
161 | /* | |
162 | * Delay if a UDP socket connect error occurs. This is most likely some | |
163 | * kind of resource problem on the local host. | |
164 | */ | |
165 | #define XS_UDP_REEST_TO (2U * HZ) | |
166 | ||
167 | /* | |
168 | * The reestablish timeout allows clients to delay for a bit before attempting | |
169 | * to reconnect to a server that just dropped our connection. | |
170 | * | |
171 | * We implement an exponential backoff when trying to reestablish a TCP | |
172 | * transport connection with the server. Some servers like to drop a TCP | |
173 | * connection when they are overworked, so we start with a short timeout and | |
174 | * increase over time if the server is down or not responding. | |
175 | */ | |
176 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
177 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
178 | ||
179 | /* | |
180 | * TCP idle timeout; client drops the transport socket if it is idle | |
181 | * for this long. Note that we also timeout UDP sockets to prevent | |
182 | * holding port numbers when there is no RPC traffic. | |
183 | */ | |
184 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
185 | ||
a246b010 CL |
186 | #ifdef RPC_DEBUG |
187 | # undef RPC_DEBUG_DATA | |
9903cd1c | 188 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
189 | #endif |
190 | ||
a246b010 | 191 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 192 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 193 | { |
9903cd1c CL |
194 | u8 *buf = (u8 *) packet; |
195 | int j; | |
a246b010 | 196 | |
46121cf7 | 197 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
198 | for (j = 0; j < count && j < 128; j += 4) { |
199 | if (!(j & 31)) { | |
200 | if (j) | |
201 | dprintk("\n"); | |
202 | dprintk("0x%04x ", j); | |
203 | } | |
204 | dprintk("%02x%02x%02x%02x ", | |
205 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
206 | } | |
207 | dprintk("\n"); | |
208 | } | |
209 | #else | |
9903cd1c | 210 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
211 | { |
212 | /* NOP */ | |
213 | } | |
214 | #endif | |
215 | ||
ffc2e518 CL |
216 | struct sock_xprt { |
217 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
218 | |
219 | /* | |
220 | * Network layer | |
221 | */ | |
222 | struct socket * sock; | |
223 | struct sock * inet; | |
51971139 CL |
224 | |
225 | /* | |
226 | * State of TCP reply receive | |
227 | */ | |
228 | __be32 tcp_fraghdr, | |
b76ce561 TM |
229 | tcp_xid, |
230 | tcp_calldir; | |
51971139 CL |
231 | |
232 | u32 tcp_offset, | |
233 | tcp_reclen; | |
234 | ||
235 | unsigned long tcp_copied, | |
236 | tcp_flags; | |
c8475461 CL |
237 | |
238 | /* | |
239 | * Connection of transports | |
240 | */ | |
34161db6 | 241 | struct delayed_work connect_worker; |
fbfffbd5 CL |
242 | struct sockaddr_storage srcaddr; |
243 | unsigned short srcport; | |
7c6e066e CL |
244 | |
245 | /* | |
246 | * UDP socket buffer size parameters | |
247 | */ | |
248 | size_t rcvsize, | |
249 | sndsize; | |
314dfd79 CL |
250 | |
251 | /* | |
252 | * Saved socket callback addresses | |
253 | */ | |
254 | void (*old_data_ready)(struct sock *, int); | |
255 | void (*old_state_change)(struct sock *); | |
256 | void (*old_write_space)(struct sock *); | |
2a9e1cfa | 257 | void (*old_error_report)(struct sock *); |
ffc2e518 CL |
258 | }; |
259 | ||
e136d092 CL |
260 | /* |
261 | * TCP receive state flags | |
262 | */ | |
263 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
264 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
265 | #define TCP_RCV_COPY_XID (1UL << 2) | |
266 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
267 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
268 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
269 | |
270 | /* | |
271 | * TCP RPC flags | |
272 | */ | |
f4a2e418 | 273 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 274 | |
95392c59 CL |
275 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
276 | { | |
277 | return (struct sockaddr *) &xprt->addr; | |
278 | } | |
279 | ||
176e21ee CL |
280 | static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) |
281 | { | |
282 | return (struct sockaddr_un *) &xprt->addr; | |
283 | } | |
284 | ||
95392c59 | 285 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
edb267a6 | 286 | { |
95392c59 CL |
287 | return (struct sockaddr_in *) &xprt->addr; |
288 | } | |
289 | ||
290 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
291 | { | |
292 | return (struct sockaddr_in6 *) &xprt->addr; | |
293 | } | |
294 | ||
c877b849 | 295 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 296 | { |
c877b849 | 297 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
298 | struct sockaddr_in6 *sin6; |
299 | struct sockaddr_in *sin; | |
176e21ee | 300 | struct sockaddr_un *sun; |
c877b849 | 301 | char buf[128]; |
edb267a6 | 302 | |
9dc3b095 | 303 | switch (sap->sa_family) { |
176e21ee CL |
304 | case AF_LOCAL: |
305 | sun = xs_addr_un(xprt); | |
306 | strlcpy(buf, sun->sun_path, sizeof(buf)); | |
307 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
308 | kstrdup(buf, GFP_KERNEL); | |
309 | break; | |
9dc3b095 | 310 | case AF_INET: |
176e21ee CL |
311 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
312 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
313 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 314 | sin = xs_addr_in(xprt); |
fc0b5791 | 315 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
9dc3b095 CL |
316 | break; |
317 | case AF_INET6: | |
176e21ee CL |
318 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
319 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
320 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 321 | sin6 = xs_addr_in6(xprt); |
fc0b5791 | 322 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
9dc3b095 CL |
323 | break; |
324 | default: | |
325 | BUG(); | |
756805e7 | 326 | } |
176e21ee | 327 | |
9dc3b095 | 328 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
329 | } |
330 | ||
9dc3b095 | 331 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 332 | { |
9dc3b095 CL |
333 | struct sockaddr *sap = xs_addr(xprt); |
334 | char buf[128]; | |
4b6473fb | 335 | |
81160e66 | 336 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 337 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
4b6473fb | 338 | |
81160e66 | 339 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 CL |
340 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
341 | } | |
4b6473fb | 342 | |
9dc3b095 CL |
343 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
344 | const char *protocol, | |
345 | const char *netid) | |
c877b849 | 346 | { |
b454ae90 | 347 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 348 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 349 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 350 | xs_format_common_peer_ports(xprt); |
edb267a6 | 351 | } |
4b6473fb | 352 | |
9dc3b095 | 353 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 354 | { |
9dc3b095 CL |
355 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
356 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 357 | |
9dc3b095 | 358 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
359 | } |
360 | ||
361 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
362 | { | |
33e01dc7 CL |
363 | unsigned int i; |
364 | ||
365 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
366 | switch (i) { | |
367 | case RPC_DISPLAY_PROTO: | |
368 | case RPC_DISPLAY_NETID: | |
369 | continue; | |
370 | default: | |
371 | kfree(xprt->address_strings[i]); | |
372 | } | |
edb267a6 CL |
373 | } |
374 | ||
b4b5cc85 CL |
375 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
376 | ||
24c5684b | 377 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 378 | { |
b4b5cc85 CL |
379 | struct msghdr msg = { |
380 | .msg_name = addr, | |
381 | .msg_namelen = addrlen, | |
24c5684b TM |
382 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
383 | }; | |
384 | struct kvec iov = { | |
385 | .iov_base = vec->iov_base + base, | |
386 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
387 | }; |
388 | ||
24c5684b | 389 | if (iov.iov_len != 0) |
b4b5cc85 CL |
390 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
391 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
392 | } | |
393 | ||
24c5684b | 394 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 395 | { |
24c5684b TM |
396 | struct page **ppage; |
397 | unsigned int remainder; | |
398 | int err, sent = 0; | |
399 | ||
400 | remainder = xdr->page_len - base; | |
401 | base += xdr->page_base; | |
402 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
403 | base &= ~PAGE_MASK; | |
404 | for(;;) { | |
405 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
406 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 407 | |
24c5684b TM |
408 | remainder -= len; |
409 | if (remainder != 0 || more) | |
410 | flags |= MSG_MORE; | |
411 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
412 | if (remainder == 0 || err != len) | |
413 | break; | |
414 | sent += err; | |
415 | ppage++; | |
416 | base = 0; | |
417 | } | |
418 | if (sent == 0) | |
419 | return err; | |
420 | if (err > 0) | |
421 | sent += err; | |
422 | return sent; | |
b4b5cc85 CL |
423 | } |
424 | ||
9903cd1c CL |
425 | /** |
426 | * xs_sendpages - write pages directly to a socket | |
427 | * @sock: socket to send on | |
428 | * @addr: UDP only -- address of destination | |
429 | * @addrlen: UDP only -- length of destination address | |
430 | * @xdr: buffer containing this request | |
431 | * @base: starting position in the buffer | |
432 | * | |
a246b010 | 433 | */ |
24c5684b | 434 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 435 | { |
24c5684b TM |
436 | unsigned int remainder = xdr->len - base; |
437 | int err, sent = 0; | |
a246b010 | 438 | |
262965f5 | 439 | if (unlikely(!sock)) |
fba91afb | 440 | return -ENOTSOCK; |
262965f5 CL |
441 | |
442 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
443 | if (base != 0) { |
444 | addr = NULL; | |
445 | addrlen = 0; | |
446 | } | |
262965f5 | 447 | |
24c5684b TM |
448 | if (base < xdr->head[0].iov_len || addr != NULL) { |
449 | unsigned int len = xdr->head[0].iov_len - base; | |
450 | remainder -= len; | |
451 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
452 | if (remainder == 0 || err != len) | |
a246b010 | 453 | goto out; |
24c5684b | 454 | sent += err; |
a246b010 CL |
455 | base = 0; |
456 | } else | |
24c5684b | 457 | base -= xdr->head[0].iov_len; |
a246b010 | 458 | |
24c5684b TM |
459 | if (base < xdr->page_len) { |
460 | unsigned int len = xdr->page_len - base; | |
461 | remainder -= len; | |
462 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
463 | if (remainder == 0 || err != len) | |
a246b010 | 464 | goto out; |
24c5684b | 465 | sent += err; |
a246b010 | 466 | base = 0; |
24c5684b TM |
467 | } else |
468 | base -= xdr->page_len; | |
469 | ||
470 | if (base >= xdr->tail[0].iov_len) | |
471 | return sent; | |
472 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 473 | out: |
24c5684b TM |
474 | if (sent == 0) |
475 | return err; | |
476 | if (err > 0) | |
477 | sent += err; | |
478 | return sent; | |
a246b010 CL |
479 | } |
480 | ||
b6ddf64f TM |
481 | static void xs_nospace_callback(struct rpc_task *task) |
482 | { | |
483 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
484 | ||
485 | transport->inet->sk_write_pending--; | |
486 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
487 | } | |
488 | ||
9903cd1c | 489 | /** |
262965f5 CL |
490 | * xs_nospace - place task on wait queue if transmit was incomplete |
491 | * @task: task to put to sleep | |
9903cd1c | 492 | * |
a246b010 | 493 | */ |
5e3771ce | 494 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 495 | { |
262965f5 CL |
496 | struct rpc_rqst *req = task->tk_rqstp; |
497 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 498 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
24ca9a84 | 499 | int ret = -EAGAIN; |
a246b010 | 500 | |
46121cf7 | 501 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
502 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
503 | req->rq_slen); | |
504 | ||
b6ddf64f TM |
505 | /* Protect against races with write_space */ |
506 | spin_lock_bh(&xprt->transport_lock); | |
507 | ||
508 | /* Don't race with disconnect */ | |
509 | if (xprt_connected(xprt)) { | |
510 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
511 | /* | |
512 | * Notify TCP that we're limited by the application | |
513 | * window size | |
514 | */ | |
515 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
516 | transport->inet->sk_write_pending++; | |
517 | /* ...and wait for more buffer space */ | |
518 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
519 | } | |
520 | } else { | |
521 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 522 | ret = -ENOTCONN; |
b6ddf64f | 523 | } |
262965f5 | 524 | |
b6ddf64f | 525 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 526 | return ret; |
262965f5 CL |
527 | } |
528 | ||
61677eee CL |
529 | /* |
530 | * Construct a stream transport record marker in @buf. | |
531 | */ | |
532 | static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) | |
533 | { | |
534 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
535 | rpc_fraghdr *base = buf->head[0].iov_base; | |
536 | *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); | |
537 | } | |
538 | ||
176e21ee CL |
539 | /** |
540 | * xs_local_send_request - write an RPC request to an AF_LOCAL socket | |
541 | * @task: RPC task that manages the state of an RPC request | |
542 | * | |
543 | * Return values: | |
544 | * 0: The request has been sent | |
545 | * EAGAIN: The socket was blocked, please call again later to | |
546 | * complete the request | |
547 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
548 | * other: Some other error occured, the request was not sent | |
549 | */ | |
550 | static int xs_local_send_request(struct rpc_task *task) | |
551 | { | |
552 | struct rpc_rqst *req = task->tk_rqstp; | |
553 | struct rpc_xprt *xprt = req->rq_xprt; | |
554 | struct sock_xprt *transport = | |
555 | container_of(xprt, struct sock_xprt, xprt); | |
556 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
557 | int status; | |
558 | ||
559 | xs_encode_stream_record_marker(&req->rq_snd_buf); | |
560 | ||
561 | xs_pktdump("packet data:", | |
562 | req->rq_svec->iov_base, req->rq_svec->iov_len); | |
563 | ||
564 | status = xs_sendpages(transport->sock, NULL, 0, | |
565 | xdr, req->rq_bytes_sent); | |
566 | dprintk("RPC: %s(%u) = %d\n", | |
567 | __func__, xdr->len - req->rq_bytes_sent, status); | |
568 | if (likely(status >= 0)) { | |
569 | req->rq_bytes_sent += status; | |
570 | req->rq_xmit_bytes_sent += status; | |
571 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { | |
572 | req->rq_bytes_sent = 0; | |
573 | return 0; | |
574 | } | |
575 | status = -EAGAIN; | |
576 | } | |
577 | ||
578 | switch (status) { | |
579 | case -EAGAIN: | |
580 | status = xs_nospace(task); | |
581 | break; | |
582 | default: | |
583 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
584 | -status); | |
585 | case -EPIPE: | |
586 | xs_close(xprt); | |
587 | status = -ENOTCONN; | |
588 | } | |
589 | ||
590 | return status; | |
591 | } | |
592 | ||
262965f5 CL |
593 | /** |
594 | * xs_udp_send_request - write an RPC request to a UDP socket | |
595 | * @task: address of RPC task that manages the state of an RPC request | |
596 | * | |
597 | * Return values: | |
598 | * 0: The request has been sent | |
599 | * EAGAIN: The socket was blocked, please call again later to | |
600 | * complete the request | |
601 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 602 | * other: Some other error occurred, the request was not sent |
262965f5 CL |
603 | */ |
604 | static int xs_udp_send_request(struct rpc_task *task) | |
605 | { | |
606 | struct rpc_rqst *req = task->tk_rqstp; | |
607 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 608 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
609 | struct xdr_buf *xdr = &req->rq_snd_buf; |
610 | int status; | |
a246b010 | 611 | |
9903cd1c | 612 | xs_pktdump("packet data:", |
a246b010 CL |
613 | req->rq_svec->iov_base, |
614 | req->rq_svec->iov_len); | |
615 | ||
01d37c42 TM |
616 | if (!xprt_bound(xprt)) |
617 | return -ENOTCONN; | |
ee0ac0c2 | 618 | status = xs_sendpages(transport->sock, |
95392c59 | 619 | xs_addr(xprt), |
ee0ac0c2 CL |
620 | xprt->addrlen, xdr, |
621 | req->rq_bytes_sent); | |
a246b010 | 622 | |
46121cf7 | 623 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 624 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 625 | |
2199700f | 626 | if (status >= 0) { |
d60dbb20 | 627 | req->rq_xmit_bytes_sent += status; |
2199700f TM |
628 | if (status >= req->rq_slen) |
629 | return 0; | |
630 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 631 | status = -EAGAIN; |
2199700f | 632 | } |
a246b010 | 633 | |
262965f5 | 634 | switch (status) { |
fba91afb TM |
635 | case -ENOTSOCK: |
636 | status = -ENOTCONN; | |
637 | /* Should we call xs_close() here? */ | |
638 | break; | |
b6ddf64f | 639 | case -EAGAIN: |
5e3771ce | 640 | status = xs_nospace(task); |
b6ddf64f | 641 | break; |
c8485e4d TM |
642 | default: |
643 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
644 | -status); | |
262965f5 CL |
645 | case -ENETUNREACH: |
646 | case -EPIPE: | |
a246b010 CL |
647 | case -ECONNREFUSED: |
648 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 649 | * prompts ECONNREFUSED. */ |
b6ddf64f | 650 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 651 | } |
5fe46e9d | 652 | |
262965f5 | 653 | return status; |
a246b010 CL |
654 | } |
655 | ||
e06799f9 TM |
656 | /** |
657 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
658 | * @xprt: transport | |
659 | * | |
660 | * Initiates a graceful shutdown of the TCP socket by calling the | |
661 | * equivalent of shutdown(SHUT_WR); | |
662 | */ | |
663 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
664 | { | |
665 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
666 | struct socket *sock = transport->sock; | |
667 | ||
668 | if (sock != NULL) | |
669 | kernel_sock_shutdown(sock, SHUT_WR); | |
670 | } | |
671 | ||
9903cd1c | 672 | /** |
262965f5 | 673 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
674 | * @task: address of RPC task that manages the state of an RPC request |
675 | * | |
676 | * Return values: | |
262965f5 CL |
677 | * 0: The request has been sent |
678 | * EAGAIN: The socket was blocked, please call again later to | |
679 | * complete the request | |
680 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 681 | * other: Some other error occurred, the request was not sent |
9903cd1c CL |
682 | * |
683 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 684 | * if sendmsg is not able to make progress? |
9903cd1c | 685 | */ |
262965f5 | 686 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
687 | { |
688 | struct rpc_rqst *req = task->tk_rqstp; | |
689 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 690 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 691 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 692 | int status; |
a246b010 | 693 | |
61677eee | 694 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
a246b010 | 695 | |
262965f5 CL |
696 | xs_pktdump("packet data:", |
697 | req->rq_svec->iov_base, | |
698 | req->rq_svec->iov_len); | |
a246b010 CL |
699 | |
700 | /* Continue transmitting the packet/record. We must be careful | |
701 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 702 | * called sendmsg(). */ |
a246b010 | 703 | while (1) { |
ee0ac0c2 CL |
704 | status = xs_sendpages(transport->sock, |
705 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 706 | |
46121cf7 | 707 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 708 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 709 | |
262965f5 | 710 | if (unlikely(status < 0)) |
a246b010 | 711 | break; |
a246b010 | 712 | |
262965f5 CL |
713 | /* If we've sent the entire packet, immediately |
714 | * reset the count of bytes sent. */ | |
715 | req->rq_bytes_sent += status; | |
d60dbb20 | 716 | req->rq_xmit_bytes_sent += status; |
262965f5 CL |
717 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
718 | req->rq_bytes_sent = 0; | |
719 | return 0; | |
720 | } | |
a246b010 | 721 | |
06b4b681 TM |
722 | if (status != 0) |
723 | continue; | |
a246b010 | 724 | status = -EAGAIN; |
06b4b681 | 725 | break; |
a246b010 CL |
726 | } |
727 | ||
262965f5 | 728 | switch (status) { |
fba91afb TM |
729 | case -ENOTSOCK: |
730 | status = -ENOTCONN; | |
731 | /* Should we call xs_close() here? */ | |
732 | break; | |
262965f5 | 733 | case -EAGAIN: |
5e3771ce | 734 | status = xs_nospace(task); |
262965f5 | 735 | break; |
c8485e4d TM |
736 | default: |
737 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
738 | -status); | |
262965f5 | 739 | case -ECONNRESET: |
55420c24 | 740 | case -EPIPE: |
2a9e1cfa TM |
741 | xs_tcp_shutdown(xprt); |
742 | case -ECONNREFUSED: | |
262965f5 | 743 | case -ENOTCONN: |
b6ddf64f | 744 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 745 | } |
5fe46e9d | 746 | |
a246b010 CL |
747 | return status; |
748 | } | |
749 | ||
e0ab53de TM |
750 | /** |
751 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
752 | * @xprt: transport | |
753 | * @task: rpc task | |
754 | * | |
755 | * This cleans up if an error causes us to abort the transmission of a request. | |
756 | * In this case, the socket may need to be reset in order to avoid confusing | |
757 | * the server. | |
758 | */ | |
759 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
760 | { | |
761 | struct rpc_rqst *req; | |
762 | ||
763 | if (task != xprt->snd_task) | |
764 | return; | |
765 | if (task == NULL) | |
766 | goto out_release; | |
767 | req = task->tk_rqstp; | |
43cedbf0 TM |
768 | if (req == NULL) |
769 | goto out_release; | |
e0ab53de TM |
770 | if (req->rq_bytes_sent == 0) |
771 | goto out_release; | |
772 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
773 | goto out_release; | |
774 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
775 | out_release: | |
776 | xprt_release_xprt(xprt, task); | |
777 | } | |
778 | ||
2a9e1cfa TM |
779 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
780 | { | |
781 | transport->old_data_ready = sk->sk_data_ready; | |
782 | transport->old_state_change = sk->sk_state_change; | |
783 | transport->old_write_space = sk->sk_write_space; | |
784 | transport->old_error_report = sk->sk_error_report; | |
785 | } | |
786 | ||
787 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
788 | { | |
789 | sk->sk_data_ready = transport->old_data_ready; | |
790 | sk->sk_state_change = transport->old_state_change; | |
791 | sk->sk_write_space = transport->old_write_space; | |
792 | sk->sk_error_report = transport->old_error_report; | |
793 | } | |
794 | ||
fe315e76 | 795 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 796 | { |
ee0ac0c2 CL |
797 | struct socket *sock = transport->sock; |
798 | struct sock *sk = transport->inet; | |
a246b010 | 799 | |
fe315e76 CL |
800 | if (sk == NULL) |
801 | return; | |
9903cd1c | 802 | |
246408dc TM |
803 | transport->srcport = 0; |
804 | ||
a246b010 | 805 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
806 | transport->inet = NULL; |
807 | transport->sock = NULL; | |
a246b010 | 808 | |
9903cd1c | 809 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
810 | |
811 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
812 | write_unlock_bh(&sk->sk_callback_lock); |
813 | ||
9903cd1c | 814 | sk->sk_no_check = 0; |
a246b010 CL |
815 | |
816 | sock_release(sock); | |
fe315e76 CL |
817 | } |
818 | ||
819 | /** | |
820 | * xs_close - close a socket | |
821 | * @xprt: transport | |
822 | * | |
823 | * This is used when all requests are complete; ie, no DRC state remains | |
824 | * on the server we want to save. | |
f75e6745 TM |
825 | * |
826 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
827 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
828 | */ |
829 | static void xs_close(struct rpc_xprt *xprt) | |
830 | { | |
831 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
832 | ||
833 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
834 | ||
835 | xs_reset_transport(transport); | |
61d0a8e6 | 836 | xprt->reestablish_timeout = 0; |
fe315e76 | 837 | |
632e3bdc | 838 | smp_mb__before_clear_bit(); |
7d1e8255 | 839 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 840 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 841 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 842 | smp_mb__after_clear_bit(); |
62da3b24 | 843 | xprt_disconnect_done(xprt); |
a246b010 CL |
844 | } |
845 | ||
f75e6745 TM |
846 | static void xs_tcp_close(struct rpc_xprt *xprt) |
847 | { | |
848 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
849 | xs_close(xprt); | |
850 | else | |
851 | xs_tcp_shutdown(xprt); | |
852 | } | |
853 | ||
9903cd1c CL |
854 | /** |
855 | * xs_destroy - prepare to shutdown a transport | |
856 | * @xprt: doomed transport | |
857 | * | |
858 | */ | |
859 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 860 | { |
c8475461 CL |
861 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
862 | ||
46121cf7 | 863 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 864 | |
afe2c511 | 865 | cancel_delayed_work_sync(&transport->connect_worker); |
a246b010 | 866 | |
9903cd1c | 867 | xs_close(xprt); |
edb267a6 | 868 | xs_free_peer_addresses(xprt); |
e204e621 | 869 | xprt_free(xprt); |
bc25571e | 870 | module_put(THIS_MODULE); |
a246b010 CL |
871 | } |
872 | ||
9903cd1c CL |
873 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
874 | { | |
875 | return (struct rpc_xprt *) sk->sk_user_data; | |
876 | } | |
877 | ||
176e21ee CL |
878 | static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) |
879 | { | |
880 | struct xdr_skb_reader desc = { | |
881 | .skb = skb, | |
882 | .offset = sizeof(rpc_fraghdr), | |
883 | .count = skb->len - sizeof(rpc_fraghdr), | |
884 | }; | |
885 | ||
886 | if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) | |
887 | return -1; | |
888 | if (desc.count) | |
889 | return -1; | |
890 | return 0; | |
891 | } | |
892 | ||
893 | /** | |
894 | * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets | |
895 | * @sk: socket with data to read | |
896 | * @len: how much data to read | |
897 | * | |
898 | * Currently this assumes we can read the whole reply in a single gulp. | |
899 | */ | |
900 | static void xs_local_data_ready(struct sock *sk, int len) | |
901 | { | |
902 | struct rpc_task *task; | |
903 | struct rpc_xprt *xprt; | |
904 | struct rpc_rqst *rovr; | |
905 | struct sk_buff *skb; | |
906 | int err, repsize, copied; | |
907 | u32 _xid; | |
908 | __be32 *xp; | |
909 | ||
910 | read_lock_bh(&sk->sk_callback_lock); | |
911 | dprintk("RPC: %s...\n", __func__); | |
912 | xprt = xprt_from_sock(sk); | |
913 | if (xprt == NULL) | |
914 | goto out; | |
915 | ||
916 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
917 | if (skb == NULL) | |
918 | goto out; | |
919 | ||
176e21ee CL |
920 | repsize = skb->len - sizeof(rpc_fraghdr); |
921 | if (repsize < 4) { | |
922 | dprintk("RPC: impossible RPC reply size %d\n", repsize); | |
923 | goto dropit; | |
924 | } | |
925 | ||
926 | /* Copy the XID from the skb... */ | |
927 | xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); | |
928 | if (xp == NULL) | |
929 | goto dropit; | |
930 | ||
931 | /* Look up and lock the request corresponding to the given XID */ | |
932 | spin_lock(&xprt->transport_lock); | |
933 | rovr = xprt_lookup_rqst(xprt, *xp); | |
934 | if (!rovr) | |
935 | goto out_unlock; | |
936 | task = rovr->rq_task; | |
937 | ||
938 | copied = rovr->rq_private_buf.buflen; | |
939 | if (copied > repsize) | |
940 | copied = repsize; | |
941 | ||
942 | if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { | |
943 | dprintk("RPC: sk_buff copy failed\n"); | |
944 | goto out_unlock; | |
945 | } | |
946 | ||
947 | xprt_complete_rqst(task, copied); | |
948 | ||
949 | out_unlock: | |
950 | spin_unlock(&xprt->transport_lock); | |
951 | dropit: | |
952 | skb_free_datagram(sk, skb); | |
953 | out: | |
954 | read_unlock_bh(&sk->sk_callback_lock); | |
955 | } | |
956 | ||
9903cd1c CL |
957 | /** |
958 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
959 | * @sk: socket with data to read | |
960 | * @len: how much data to read | |
961 | * | |
a246b010 | 962 | */ |
9903cd1c | 963 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 964 | { |
9903cd1c CL |
965 | struct rpc_task *task; |
966 | struct rpc_xprt *xprt; | |
a246b010 | 967 | struct rpc_rqst *rovr; |
9903cd1c | 968 | struct sk_buff *skb; |
a246b010 | 969 | int err, repsize, copied; |
d8ed029d AD |
970 | u32 _xid; |
971 | __be32 *xp; | |
a246b010 | 972 | |
f064af1e | 973 | read_lock_bh(&sk->sk_callback_lock); |
46121cf7 | 974 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 975 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 976 | goto out; |
a246b010 CL |
977 | |
978 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
979 | goto out; | |
980 | ||
a246b010 CL |
981 | repsize = skb->len - sizeof(struct udphdr); |
982 | if (repsize < 4) { | |
46121cf7 | 983 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
984 | goto dropit; |
985 | } | |
986 | ||
987 | /* Copy the XID from the skb... */ | |
988 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
989 | sizeof(_xid), &_xid); | |
990 | if (xp == NULL) | |
991 | goto dropit; | |
992 | ||
993 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 994 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
995 | rovr = xprt_lookup_rqst(xprt, *xp); |
996 | if (!rovr) | |
997 | goto out_unlock; | |
998 | task = rovr->rq_task; | |
999 | ||
a246b010 CL |
1000 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
1001 | copied = repsize; | |
1002 | ||
1003 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
1004 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
1005 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 1006 | goto out_unlock; |
1781f7f5 HX |
1007 | } |
1008 | ||
1009 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 | 1010 | |
1570c1e4 | 1011 | xprt_adjust_cwnd(task, copied); |
1570c1e4 | 1012 | xprt_complete_rqst(task, copied); |
a246b010 CL |
1013 | |
1014 | out_unlock: | |
4a0f8c04 | 1015 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
1016 | dropit: |
1017 | skb_free_datagram(sk, skb); | |
1018 | out: | |
f064af1e | 1019 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1020 | } |
1021 | ||
a519fc7a TM |
1022 | /* |
1023 | * Helper function to force a TCP close if the server is sending | |
1024 | * junk and/or it has put us in CLOSE_WAIT | |
1025 | */ | |
1026 | static void xs_tcp_force_close(struct rpc_xprt *xprt) | |
1027 | { | |
1028 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
1029 | xprt_force_disconnect(xprt); | |
1030 | } | |
1031 | ||
dd456471 | 1032 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 1033 | { |
51971139 | 1034 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
1035 | size_t len, used; |
1036 | char *p; | |
1037 | ||
51971139 CL |
1038 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
1039 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 1040 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1041 | transport->tcp_offset += used; |
a246b010 CL |
1042 | if (used != len) |
1043 | return; | |
808012fb | 1044 | |
51971139 CL |
1045 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
1046 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 1047 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 1048 | else |
e136d092 | 1049 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 1050 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 1051 | |
e136d092 | 1052 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 1053 | transport->tcp_offset = 0; |
808012fb | 1054 | |
a246b010 | 1055 | /* Sanity check of the record length */ |
18dca02a | 1056 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 1057 | dprintk("RPC: invalid TCP record fragment length\n"); |
a519fc7a | 1058 | xs_tcp_force_close(xprt); |
9903cd1c | 1059 | return; |
a246b010 | 1060 | } |
46121cf7 | 1061 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 1062 | transport->tcp_reclen); |
a246b010 CL |
1063 | } |
1064 | ||
51971139 | 1065 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 1066 | { |
51971139 | 1067 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 1068 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 1069 | transport->tcp_offset = 0; |
e136d092 CL |
1070 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
1071 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1072 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 1073 | transport->tcp_copied = 0; |
a246b010 CL |
1074 | } |
1075 | } | |
1076 | } | |
1077 | ||
dd456471 | 1078 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1079 | { |
1080 | size_t len, used; | |
1081 | char *p; | |
1082 | ||
51971139 | 1083 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 1084 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 1085 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 1086 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1087 | transport->tcp_offset += used; |
a246b010 CL |
1088 | if (used != len) |
1089 | return; | |
e136d092 | 1090 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 1091 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 1092 | transport->tcp_copied = 4; |
18dca02a RL |
1093 | dprintk("RPC: reading %s XID %08x\n", |
1094 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
1095 | : "request with", | |
51971139 CL |
1096 | ntohl(transport->tcp_xid)); |
1097 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
1098 | } |
1099 | ||
18dca02a RL |
1100 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1101 | struct xdr_skb_reader *desc) | |
a246b010 | 1102 | { |
18dca02a RL |
1103 | size_t len, used; |
1104 | u32 offset; | |
b76ce561 | 1105 | char *p; |
18dca02a RL |
1106 | |
1107 | /* | |
1108 | * We want transport->tcp_offset to be 8 at the end of this routine | |
1109 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
1110 | * When this function is called for the first time, | |
1111 | * transport->tcp_offset is 4 (after having already read the xid). | |
1112 | */ | |
1113 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
b76ce561 | 1114 | len = sizeof(transport->tcp_calldir) - offset; |
18dca02a | 1115 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
b76ce561 TM |
1116 | p = ((char *) &transport->tcp_calldir) + offset; |
1117 | used = xdr_skb_read_bits(desc, p, len); | |
18dca02a RL |
1118 | transport->tcp_offset += used; |
1119 | if (used != len) | |
1120 | return; | |
f4a2e418 | 1121 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
f4a2e418 RL |
1122 | /* |
1123 | * We don't yet have the XDR buffer, so we will write the calldir | |
1124 | * out after we get the buffer from the 'struct rpc_rqst' | |
1125 | */ | |
b76ce561 TM |
1126 | switch (ntohl(transport->tcp_calldir)) { |
1127 | case RPC_REPLY: | |
1128 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1129 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1130 | transport->tcp_flags |= TCP_RPC_REPLY; |
b76ce561 TM |
1131 | break; |
1132 | case RPC_CALL: | |
1133 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1134 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1135 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
b76ce561 TM |
1136 | break; |
1137 | default: | |
1138 | dprintk("RPC: invalid request message type\n"); | |
a519fc7a | 1139 | xs_tcp_force_close(&transport->xprt); |
b76ce561 | 1140 | } |
18dca02a RL |
1141 | xs_tcp_check_fraghdr(transport); |
1142 | } | |
1143 | ||
44b98efd RL |
1144 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1145 | struct xdr_skb_reader *desc, | |
1146 | struct rpc_rqst *req) | |
a246b010 | 1147 | { |
44b98efd RL |
1148 | struct sock_xprt *transport = |
1149 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1150 | struct xdr_buf *rcvbuf; |
1151 | size_t len; | |
1152 | ssize_t r; | |
1153 | ||
a246b010 | 1154 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1155 | |
1156 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1157 | /* | |
1158 | * Save the RPC direction in the XDR buffer | |
1159 | */ | |
f4a2e418 | 1160 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
b76ce561 TM |
1161 | &transport->tcp_calldir, |
1162 | sizeof(transport->tcp_calldir)); | |
1163 | transport->tcp_copied += sizeof(transport->tcp_calldir); | |
f4a2e418 | 1164 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
a246b010 CL |
1165 | } |
1166 | ||
a246b010 | 1167 | len = desc->count; |
51971139 | 1168 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1169 | struct xdr_skb_reader my_desc; |
a246b010 | 1170 | |
51971139 | 1171 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1172 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1173 | my_desc.count = len; | |
51971139 | 1174 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1175 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1176 | desc->count -= r; |
1177 | desc->offset += r; | |
1178 | } else | |
51971139 | 1179 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1180 | desc, xdr_skb_read_bits); |
a246b010 CL |
1181 | |
1182 | if (r > 0) { | |
51971139 CL |
1183 | transport->tcp_copied += r; |
1184 | transport->tcp_offset += r; | |
a246b010 CL |
1185 | } |
1186 | if (r != len) { | |
1187 | /* Error when copying to the receive buffer, | |
1188 | * usually because we weren't able to allocate | |
1189 | * additional buffer pages. All we can do now | |
e136d092 | 1190 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1191 | * will not receive any additional updates, |
1192 | * and time out. | |
1193 | * Any remaining data from this record will | |
1194 | * be discarded. | |
1195 | */ | |
e136d092 | 1196 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1197 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1198 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1199 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1200 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1201 | xprt, transport->tcp_copied, | |
1202 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1203 | return; |
a246b010 CL |
1204 | } |
1205 | ||
46121cf7 | 1206 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1207 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1208 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1209 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1210 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1211 | |
1212 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1213 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1214 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1215 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1216 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 | 1217 | } |
44b98efd RL |
1218 | } |
1219 | ||
1220 | /* | |
1221 | * Finds the request corresponding to the RPC xid and invokes the common | |
1222 | * tcp read code to read the data. | |
1223 | */ | |
1224 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1225 | struct xdr_skb_reader *desc) | |
1226 | { | |
1227 | struct sock_xprt *transport = | |
1228 | container_of(xprt, struct sock_xprt, xprt); | |
1229 | struct rpc_rqst *req; | |
1230 | ||
1231 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1232 | ||
1233 | /* Find and lock the request corresponding to this xid */ | |
1234 | spin_lock(&xprt->transport_lock); | |
1235 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1236 | if (!req) { | |
1237 | dprintk("RPC: XID %08x request not found!\n", | |
1238 | ntohl(transport->tcp_xid)); | |
1239 | spin_unlock(&xprt->transport_lock); | |
1240 | return -1; | |
1241 | } | |
1242 | ||
1243 | xs_tcp_read_common(xprt, desc, req); | |
1244 | ||
e136d092 | 1245 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1246 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1247 | |
4a0f8c04 | 1248 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1249 | return 0; |
1250 | } | |
1251 | ||
9e00abc3 | 1252 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
44b98efd RL |
1253 | /* |
1254 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1255 | * tcp read code to read the data. The result is placed in the callback | |
1256 | * queue. | |
1257 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1258 | * connection and return -1. | |
1259 | */ | |
1260 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1261 | struct xdr_skb_reader *desc) | |
1262 | { | |
1263 | struct sock_xprt *transport = | |
1264 | container_of(xprt, struct sock_xprt, xprt); | |
1265 | struct rpc_rqst *req; | |
1266 | ||
1267 | req = xprt_alloc_bc_request(xprt); | |
1268 | if (req == NULL) { | |
1269 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1270 | xprt_force_disconnect(xprt); | |
1271 | return -1; | |
1272 | } | |
1273 | ||
1274 | req->rq_xid = transport->tcp_xid; | |
1275 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1276 | xs_tcp_read_common(xprt, desc, req); | |
1277 | ||
1278 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1279 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1280 | ||
1281 | /* | |
1282 | * Add callback request to callback list. The callback | |
1283 | * service sleeps on the sv_cb_waitq waiting for new | |
1284 | * requests. Wake it up after adding enqueing the | |
1285 | * request. | |
1286 | */ | |
1287 | dprintk("RPC: add callback request to list\n"); | |
1288 | spin_lock(&bc_serv->sv_cb_lock); | |
1289 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1290 | spin_unlock(&bc_serv->sv_cb_lock); | |
1291 | wake_up(&bc_serv->sv_cb_waitq); | |
1292 | } | |
1293 | ||
1294 | req->rq_private_buf.len = transport->tcp_copied; | |
1295 | ||
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1300 | struct xdr_skb_reader *desc) | |
1301 | { | |
1302 | struct sock_xprt *transport = | |
1303 | container_of(xprt, struct sock_xprt, xprt); | |
1304 | ||
1305 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1306 | xs_tcp_read_reply(xprt, desc) : | |
1307 | xs_tcp_read_callback(xprt, desc); | |
1308 | } | |
1309 | #else | |
1310 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1311 | struct xdr_skb_reader *desc) | |
1312 | { | |
1313 | return xs_tcp_read_reply(xprt, desc); | |
1314 | } | |
9e00abc3 | 1315 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
44b98efd RL |
1316 | |
1317 | /* | |
1318 | * Read data off the transport. This can be either an RPC_CALL or an | |
1319 | * RPC_REPLY. Relay the processing to helper functions. | |
1320 | */ | |
1321 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1322 | struct xdr_skb_reader *desc) | |
1323 | { | |
1324 | struct sock_xprt *transport = | |
1325 | container_of(xprt, struct sock_xprt, xprt); | |
1326 | ||
1327 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1328 | xs_tcp_check_fraghdr(transport); | |
1329 | else { | |
1330 | /* | |
1331 | * The transport_lock protects the request handling. | |
1332 | * There's no need to hold it to update the tcp_flags. | |
1333 | */ | |
1334 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1335 | } | |
a246b010 CL |
1336 | } |
1337 | ||
dd456471 | 1338 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1339 | { |
1340 | size_t len; | |
1341 | ||
51971139 | 1342 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1343 | if (len > desc->count) |
1344 | len = desc->count; | |
1345 | desc->count -= len; | |
1346 | desc->offset += len; | |
51971139 | 1347 | transport->tcp_offset += len; |
46121cf7 | 1348 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1349 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1350 | } |
1351 | ||
9903cd1c | 1352 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1353 | { |
1354 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1355 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1356 | struct xdr_skb_reader desc = { |
a246b010 CL |
1357 | .skb = skb, |
1358 | .offset = offset, | |
1359 | .count = len, | |
9903cd1c | 1360 | }; |
a246b010 | 1361 | |
46121cf7 | 1362 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1363 | do { |
1364 | /* Read in a new fragment marker if necessary */ | |
1365 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1366 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1367 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1368 | continue; |
1369 | } | |
1370 | /* Read in the xid if necessary */ | |
e136d092 | 1371 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1372 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1373 | continue; |
1374 | } | |
18dca02a | 1375 | /* Read in the call/reply flag */ |
f4a2e418 | 1376 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1377 | xs_tcp_read_calldir(transport, &desc); |
1378 | continue; | |
1379 | } | |
a246b010 | 1380 | /* Read in the request data */ |
e136d092 | 1381 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1382 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1383 | continue; |
1384 | } | |
1385 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1386 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1387 | } while (desc.count); |
46121cf7 | 1388 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1389 | return len - desc.count; |
1390 | } | |
1391 | ||
9903cd1c CL |
1392 | /** |
1393 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1394 | * @sk: socket with data to read | |
1395 | * @bytes: how much data to read | |
1396 | * | |
1397 | */ | |
1398 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1399 | { |
1400 | struct rpc_xprt *xprt; | |
1401 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1402 | int read; |
a246b010 | 1403 | |
46121cf7 CL |
1404 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1405 | ||
f064af1e | 1406 | read_lock_bh(&sk->sk_callback_lock); |
9903cd1c | 1407 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1408 | goto out; |
61d0a8e6 NB |
1409 | /* Any data means we had a useful conversation, so |
1410 | * the we don't need to delay the next reconnect | |
1411 | */ | |
1412 | if (xprt->reestablish_timeout) | |
1413 | xprt->reestablish_timeout = 0; | |
1414 | ||
9903cd1c | 1415 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1416 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1417 | do { |
1418 | rd_desc.count = 65536; | |
1419 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1420 | } while (read > 0); | |
a246b010 | 1421 | out: |
f064af1e | 1422 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1423 | } |
1424 | ||
7d1e8255 TM |
1425 | /* |
1426 | * Do the equivalent of linger/linger2 handling for dealing with | |
1427 | * broken servers that don't close the socket in a timely | |
1428 | * fashion | |
1429 | */ | |
1430 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1431 | unsigned long timeout) | |
1432 | { | |
1433 | struct sock_xprt *transport; | |
1434 | ||
1435 | if (xprt_test_and_set_connecting(xprt)) | |
1436 | return; | |
1437 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1438 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1439 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1440 | timeout); | |
1441 | } | |
1442 | ||
1443 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1444 | { | |
1445 | struct sock_xprt *transport; | |
1446 | ||
1447 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1448 | ||
1449 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1450 | !cancel_delayed_work(&transport->connect_worker)) | |
1451 | return; | |
1452 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1453 | xprt_clear_connecting(xprt); | |
1454 | } | |
1455 | ||
1456 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1457 | { | |
1458 | smp_mb__before_clear_bit(); | |
a519fc7a TM |
1459 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1460 | clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
7d1e8255 TM |
1461 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1462 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1463 | smp_mb__after_clear_bit(); | |
1464 | /* Mark transport as closed and wake up all pending tasks */ | |
1465 | xprt_disconnect_done(xprt); | |
1466 | } | |
1467 | ||
9903cd1c CL |
1468 | /** |
1469 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1470 | * @sk: socket whose state has changed | |
1471 | * | |
1472 | */ | |
1473 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1474 | { |
9903cd1c | 1475 | struct rpc_xprt *xprt; |
a246b010 | 1476 | |
f064af1e | 1477 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1478 | if (!(xprt = xprt_from_sock(sk))) |
1479 | goto out; | |
46121cf7 | 1480 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
669502ff | 1481 | dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
46121cf7 CL |
1482 | sk->sk_state, xprt_connected(xprt), |
1483 | sock_flag(sk, SOCK_DEAD), | |
669502ff AC |
1484 | sock_flag(sk, SOCK_ZAPPED), |
1485 | sk->sk_shutdown); | |
a246b010 CL |
1486 | |
1487 | switch (sk->sk_state) { | |
1488 | case TCP_ESTABLISHED: | |
f064af1e | 1489 | spin_lock(&xprt->transport_lock); |
a246b010 | 1490 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1491 | struct sock_xprt *transport = container_of(xprt, |
1492 | struct sock_xprt, xprt); | |
1493 | ||
a246b010 | 1494 | /* Reset TCP record info */ |
51971139 CL |
1495 | transport->tcp_offset = 0; |
1496 | transport->tcp_reclen = 0; | |
1497 | transport->tcp_copied = 0; | |
e136d092 CL |
1498 | transport->tcp_flags = |
1499 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1500 | |
2a491991 | 1501 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1502 | } |
f064af1e | 1503 | spin_unlock(&xprt->transport_lock); |
a246b010 | 1504 | break; |
3b948ae5 TM |
1505 | case TCP_FIN_WAIT1: |
1506 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1507 | xprt->connect_cookie++; |
663b8858 | 1508 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1509 | set_bit(XPRT_CLOSING, &xprt->state); |
1510 | smp_mb__before_clear_bit(); | |
1511 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1512 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1513 | smp_mb__after_clear_bit(); |
25fe6142 | 1514 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1515 | break; |
632e3bdc | 1516 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1517 | /* The server initiated a shutdown of the socket */ |
7c1d71cf | 1518 | xprt->connect_cookie++; |
a519fc7a | 1519 | xs_tcp_force_close(xprt); |
663b8858 TM |
1520 | case TCP_CLOSING: |
1521 | /* | |
1522 | * If the server closed down the connection, make sure that | |
1523 | * we back off before reconnecting | |
1524 | */ | |
1525 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1526 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1527 | break; |
1528 | case TCP_LAST_ACK: | |
670f9457 | 1529 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1530 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1531 | smp_mb__before_clear_bit(); |
1532 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1533 | smp_mb__after_clear_bit(); | |
1534 | break; | |
1535 | case TCP_CLOSE: | |
7d1e8255 TM |
1536 | xs_tcp_cancel_linger_timeout(xprt); |
1537 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1538 | } |
1539 | out: | |
f064af1e | 1540 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1541 | } |
1542 | ||
2a9e1cfa | 1543 | /** |
482f32e6 | 1544 | * xs_error_report - callback mainly for catching socket errors |
2a9e1cfa TM |
1545 | * @sk: socket |
1546 | */ | |
482f32e6 | 1547 | static void xs_error_report(struct sock *sk) |
2a9e1cfa TM |
1548 | { |
1549 | struct rpc_xprt *xprt; | |
1550 | ||
f064af1e | 1551 | read_lock_bh(&sk->sk_callback_lock); |
2a9e1cfa TM |
1552 | if (!(xprt = xprt_from_sock(sk))) |
1553 | goto out; | |
1554 | dprintk("RPC: %s client %p...\n" | |
1555 | "RPC: error %d\n", | |
1556 | __func__, xprt, sk->sk_err); | |
482f32e6 | 1557 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
2a9e1cfa | 1558 | out: |
f064af1e | 1559 | read_unlock_bh(&sk->sk_callback_lock); |
2a9e1cfa TM |
1560 | } |
1561 | ||
1f0fa154 IJ |
1562 | static void xs_write_space(struct sock *sk) |
1563 | { | |
1564 | struct socket *sock; | |
1565 | struct rpc_xprt *xprt; | |
1566 | ||
1567 | if (unlikely(!(sock = sk->sk_socket))) | |
1568 | return; | |
1569 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1570 | ||
1571 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1572 | return; | |
1573 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1574 | return; | |
1575 | ||
1576 | xprt_write_space(xprt); | |
1577 | } | |
1578 | ||
9903cd1c | 1579 | /** |
c7b2cae8 CL |
1580 | * xs_udp_write_space - callback invoked when socket buffer space |
1581 | * becomes available | |
9903cd1c CL |
1582 | * @sk: socket whose state has changed |
1583 | * | |
a246b010 CL |
1584 | * Called when more output buffer space is available for this socket. |
1585 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1586 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1587 | * with a bunch of small requests. |
1588 | */ | |
c7b2cae8 | 1589 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1590 | { |
f064af1e | 1591 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1592 | |
c7b2cae8 | 1593 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1594 | if (sock_writeable(sk)) |
1595 | xs_write_space(sk); | |
a246b010 | 1596 | |
f064af1e | 1597 | read_unlock_bh(&sk->sk_callback_lock); |
c7b2cae8 | 1598 | } |
a246b010 | 1599 | |
c7b2cae8 CL |
1600 | /** |
1601 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1602 | * becomes available | |
1603 | * @sk: socket whose state has changed | |
1604 | * | |
1605 | * Called when more output buffer space is available for this socket. | |
1606 | * We try not to wake our writers until they can make "significant" | |
1607 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1608 | * with a bunch of small requests. | |
1609 | */ | |
1610 | static void xs_tcp_write_space(struct sock *sk) | |
1611 | { | |
f064af1e | 1612 | read_lock_bh(&sk->sk_callback_lock); |
c7b2cae8 CL |
1613 | |
1614 | /* from net/core/stream.c:sk_stream_write_space */ | |
1f0fa154 IJ |
1615 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1616 | xs_write_space(sk); | |
b6ddf64f | 1617 | |
f064af1e | 1618 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1619 | } |
1620 | ||
470056c2 | 1621 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1622 | { |
ee0ac0c2 CL |
1623 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1624 | struct sock *sk = transport->inet; | |
a246b010 | 1625 | |
7c6e066e | 1626 | if (transport->rcvsize) { |
a246b010 | 1627 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1628 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1629 | } |
7c6e066e | 1630 | if (transport->sndsize) { |
a246b010 | 1631 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1632 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1633 | sk->sk_write_space(sk); |
1634 | } | |
1635 | } | |
1636 | ||
43118c29 | 1637 | /** |
470056c2 | 1638 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1639 | * @xprt: generic transport |
470056c2 CL |
1640 | * @sndsize: requested size of send buffer, in bytes |
1641 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1642 | * |
470056c2 | 1643 | * Set socket send and receive buffer size limits. |
43118c29 | 1644 | */ |
470056c2 | 1645 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1646 | { |
7c6e066e CL |
1647 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1648 | ||
1649 | transport->sndsize = 0; | |
470056c2 | 1650 | if (sndsize) |
7c6e066e CL |
1651 | transport->sndsize = sndsize + 1024; |
1652 | transport->rcvsize = 0; | |
470056c2 | 1653 | if (rcvsize) |
7c6e066e | 1654 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1655 | |
1656 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1657 | } |
1658 | ||
46c0ee8b CL |
1659 | /** |
1660 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1661 | * @task: task that timed out | |
1662 | * | |
1663 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1664 | */ | |
1665 | static void xs_udp_timer(struct rpc_task *task) | |
1666 | { | |
1667 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1668 | } | |
1669 | ||
b85d8806 CL |
1670 | static unsigned short xs_get_random_port(void) |
1671 | { | |
1672 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1673 | unsigned short rand = (unsigned short) net_random() % range; | |
1674 | return rand + xprt_min_resvport; | |
1675 | } | |
1676 | ||
92200412 CL |
1677 | /** |
1678 | * xs_set_port - reset the port number in the remote endpoint address | |
1679 | * @xprt: generic transport | |
1680 | * @port: new port number | |
1681 | * | |
1682 | */ | |
1683 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1684 | { | |
46121cf7 | 1685 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1686 | |
9dc3b095 CL |
1687 | rpc_set_port(xs_addr(xprt), port); |
1688 | xs_update_peer_port(xprt); | |
92200412 CL |
1689 | } |
1690 | ||
5d4ec932 | 1691 | static unsigned short xs_get_srcport(struct sock_xprt *transport) |
67a391d7 | 1692 | { |
fbfffbd5 | 1693 | unsigned short port = transport->srcport; |
67a391d7 TM |
1694 | |
1695 | if (port == 0 && transport->xprt.resvport) | |
1696 | port = xs_get_random_port(); | |
1697 | return port; | |
1698 | } | |
1699 | ||
baaf4e48 | 1700 | static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
67a391d7 | 1701 | { |
fbfffbd5 CL |
1702 | if (transport->srcport != 0) |
1703 | transport->srcport = 0; | |
67a391d7 TM |
1704 | if (!transport->xprt.resvport) |
1705 | return 0; | |
1706 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1707 | return xprt_max_resvport; | |
1708 | return --port; | |
1709 | } | |
beb59b68 | 1710 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
a246b010 | 1711 | { |
beb59b68 | 1712 | struct sockaddr_storage myaddr; |
67a391d7 | 1713 | int err, nloop = 0; |
5d4ec932 | 1714 | unsigned short port = xs_get_srcport(transport); |
67a391d7 | 1715 | unsigned short last; |
a246b010 | 1716 | |
beb59b68 | 1717 | memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
a246b010 | 1718 | do { |
beb59b68 PE |
1719 | rpc_set_port((struct sockaddr *)&myaddr, port); |
1720 | err = kernel_bind(sock, (struct sockaddr *)&myaddr, | |
1721 | transport->xprt.addrlen); | |
67a391d7 | 1722 | if (port == 0) |
d3bc9a1d | 1723 | break; |
a246b010 | 1724 | if (err == 0) { |
fbfffbd5 | 1725 | transport->srcport = port; |
d3bc9a1d | 1726 | break; |
a246b010 | 1727 | } |
67a391d7 | 1728 | last = port; |
baaf4e48 | 1729 | port = xs_next_srcport(transport, port); |
67a391d7 TM |
1730 | if (port > last) |
1731 | nloop++; | |
1732 | } while (err == -EADDRINUSE && nloop != 2); | |
90058d37 | 1733 | |
4232e863 | 1734 | if (myaddr.ss_family == AF_INET) |
beb59b68 PE |
1735 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
1736 | &((struct sockaddr_in *)&myaddr)->sin_addr, | |
1737 | port, err ? "failed" : "ok", err); | |
1738 | else | |
1739 | dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, | |
1740 | &((struct sockaddr_in6 *)&myaddr)->sin6_addr, | |
1741 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1742 | return err; |
1743 | } | |
1744 | ||
176e21ee CL |
1745 | /* |
1746 | * We don't support autobind on AF_LOCAL sockets | |
1747 | */ | |
1748 | static void xs_local_rpcbind(struct rpc_task *task) | |
1749 | { | |
1750 | xprt_set_bound(task->tk_xprt); | |
1751 | } | |
1752 | ||
1753 | static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1754 | { | |
1755 | } | |
beb59b68 | 1756 | |
ed07536e PZ |
1757 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1758 | static struct lock_class_key xs_key[2]; | |
1759 | static struct lock_class_key xs_slock_key[2]; | |
1760 | ||
176e21ee CL |
1761 | static inline void xs_reclassify_socketu(struct socket *sock) |
1762 | { | |
1763 | struct sock *sk = sock->sk; | |
1764 | ||
1765 | BUG_ON(sock_owned_by_user(sk)); | |
1766 | sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", | |
1767 | &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); | |
1768 | } | |
1769 | ||
8945ee5e | 1770 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1771 | { |
1772 | struct sock *sk = sock->sk; | |
8945ee5e | 1773 | |
02b3d346 | 1774 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1775 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1776 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1777 | } | |
ed07536e | 1778 | |
8945ee5e CL |
1779 | static inline void xs_reclassify_socket6(struct socket *sock) |
1780 | { | |
1781 | struct sock *sk = sock->sk; | |
ed07536e | 1782 | |
f4921aff | 1783 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1784 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1785 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e | 1786 | } |
6bc9638a PE |
1787 | |
1788 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1789 | { | |
4232e863 | 1790 | switch (family) { |
176e21ee CL |
1791 | case AF_LOCAL: |
1792 | xs_reclassify_socketu(sock); | |
1793 | break; | |
4232e863 | 1794 | case AF_INET: |
6bc9638a | 1795 | xs_reclassify_socket4(sock); |
4232e863 CL |
1796 | break; |
1797 | case AF_INET6: | |
6bc9638a | 1798 | xs_reclassify_socket6(sock); |
4232e863 CL |
1799 | break; |
1800 | } | |
6bc9638a | 1801 | } |
ed07536e | 1802 | #else |
176e21ee CL |
1803 | static inline void xs_reclassify_socketu(struct socket *sock) |
1804 | { | |
1805 | } | |
1806 | ||
8945ee5e CL |
1807 | static inline void xs_reclassify_socket4(struct socket *sock) |
1808 | { | |
1809 | } | |
1810 | ||
1811 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1812 | { |
1813 | } | |
6bc9638a PE |
1814 | |
1815 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1816 | { | |
1817 | } | |
ed07536e PZ |
1818 | #endif |
1819 | ||
6bc9638a PE |
1820 | static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
1821 | struct sock_xprt *transport, int family, int type, int protocol) | |
22f79326 PE |
1822 | { |
1823 | struct socket *sock; | |
1824 | int err; | |
1825 | ||
6bc9638a | 1826 | err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
22f79326 PE |
1827 | if (err < 0) { |
1828 | dprintk("RPC: can't create %d transport socket (%d).\n", | |
1829 | protocol, -err); | |
1830 | goto out; | |
1831 | } | |
6bc9638a | 1832 | xs_reclassify_socket(family, sock); |
22f79326 | 1833 | |
4cea288a BH |
1834 | err = xs_bind(transport, sock); |
1835 | if (err) { | |
22f79326 PE |
1836 | sock_release(sock); |
1837 | goto out; | |
1838 | } | |
1839 | ||
1840 | return sock; | |
1841 | out: | |
1842 | return ERR_PTR(err); | |
1843 | } | |
1844 | ||
176e21ee CL |
1845 | static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
1846 | struct socket *sock) | |
1847 | { | |
1848 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1849 | xprt); | |
1850 | ||
1851 | if (!transport->inet) { | |
1852 | struct sock *sk = sock->sk; | |
1853 | ||
1854 | write_lock_bh(&sk->sk_callback_lock); | |
1855 | ||
1856 | xs_save_old_callbacks(transport, sk); | |
1857 | ||
1858 | sk->sk_user_data = xprt; | |
1859 | sk->sk_data_ready = xs_local_data_ready; | |
1860 | sk->sk_write_space = xs_udp_write_space; | |
1861 | sk->sk_error_report = xs_error_report; | |
1862 | sk->sk_allocation = GFP_ATOMIC; | |
1863 | ||
1864 | xprt_clear_connected(xprt); | |
1865 | ||
1866 | /* Reset to new socket */ | |
1867 | transport->sock = sock; | |
1868 | transport->inet = sk; | |
1869 | ||
1870 | write_unlock_bh(&sk->sk_callback_lock); | |
1871 | } | |
1872 | ||
1873 | /* Tell the socket layer to start connecting... */ | |
1874 | xprt->stat.connect_count++; | |
1875 | xprt->stat.connect_start = jiffies; | |
1876 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); | |
1877 | } | |
1878 | ||
1879 | /** | |
1880 | * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint | |
1881 | * @xprt: RPC transport to connect | |
1882 | * @transport: socket transport to connect | |
1883 | * @create_sock: function to create a socket of the correct type | |
1884 | * | |
1885 | * Invoked by a work queue tasklet. | |
1886 | */ | |
1887 | static void xs_local_setup_socket(struct work_struct *work) | |
1888 | { | |
1889 | struct sock_xprt *transport = | |
1890 | container_of(work, struct sock_xprt, connect_worker.work); | |
1891 | struct rpc_xprt *xprt = &transport->xprt; | |
1892 | struct socket *sock; | |
1893 | int status = -EIO; | |
1894 | ||
5cf02d09 JL |
1895 | current->flags |= PF_FSTRANS; |
1896 | ||
176e21ee CL |
1897 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1898 | status = __sock_create(xprt->xprt_net, AF_LOCAL, | |
1899 | SOCK_STREAM, 0, &sock, 1); | |
1900 | if (status < 0) { | |
1901 | dprintk("RPC: can't create AF_LOCAL " | |
1902 | "transport socket (%d).\n", -status); | |
1903 | goto out; | |
1904 | } | |
1905 | xs_reclassify_socketu(sock); | |
1906 | ||
1907 | dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", | |
1908 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1909 | ||
1910 | status = xs_local_finish_connecting(xprt, sock); | |
1911 | switch (status) { | |
1912 | case 0: | |
1913 | dprintk("RPC: xprt %p connected to %s\n", | |
1914 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1915 | xprt_set_connected(xprt); | |
1916 | break; | |
1917 | case -ENOENT: | |
1918 | dprintk("RPC: xprt %p: socket %s does not exist\n", | |
1919 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1920 | break; | |
1921 | default: | |
1922 | printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", | |
1923 | __func__, -status, | |
1924 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1925 | } | |
1926 | ||
1927 | out: | |
1928 | xprt_clear_connecting(xprt); | |
1929 | xprt_wake_pending_tasks(xprt, status); | |
5cf02d09 | 1930 | current->flags &= ~PF_FSTRANS; |
176e21ee CL |
1931 | } |
1932 | ||
a564b8f0 MG |
1933 | #ifdef CONFIG_SUNRPC_SWAP |
1934 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
1935 | { | |
1936 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1937 | xprt); | |
1938 | ||
1939 | if (xprt->swapper) | |
1940 | sk_set_memalloc(transport->inet); | |
1941 | } | |
1942 | ||
1943 | /** | |
1944 | * xs_swapper - Tag this transport as being used for swap. | |
1945 | * @xprt: transport to tag | |
1946 | * @enable: enable/disable | |
1947 | * | |
1948 | */ | |
1949 | int xs_swapper(struct rpc_xprt *xprt, int enable) | |
1950 | { | |
1951 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1952 | xprt); | |
1953 | int err = 0; | |
1954 | ||
1955 | if (enable) { | |
1956 | xprt->swapper++; | |
1957 | xs_set_memalloc(xprt); | |
1958 | } else if (xprt->swapper) { | |
1959 | xprt->swapper--; | |
1960 | sk_clear_memalloc(transport->inet); | |
1961 | } | |
1962 | ||
1963 | return err; | |
1964 | } | |
1965 | EXPORT_SYMBOL_GPL(xs_swapper); | |
1966 | #else | |
1967 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
1968 | { | |
1969 | } | |
1970 | #endif | |
1971 | ||
16be2d20 CL |
1972 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1973 | { | |
1974 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1975 | ||
1976 | if (!transport->inet) { | |
1977 | struct sock *sk = sock->sk; | |
1978 | ||
1979 | write_lock_bh(&sk->sk_callback_lock); | |
1980 | ||
2a9e1cfa TM |
1981 | xs_save_old_callbacks(transport, sk); |
1982 | ||
16be2d20 | 1983 | sk->sk_user_data = xprt; |
16be2d20 CL |
1984 | sk->sk_data_ready = xs_udp_data_ready; |
1985 | sk->sk_write_space = xs_udp_write_space; | |
482f32e6 | 1986 | sk->sk_error_report = xs_error_report; |
16be2d20 CL |
1987 | sk->sk_no_check = UDP_CSUM_NORCV; |
1988 | sk->sk_allocation = GFP_ATOMIC; | |
1989 | ||
1990 | xprt_set_connected(xprt); | |
1991 | ||
1992 | /* Reset to new socket */ | |
1993 | transport->sock = sock; | |
1994 | transport->inet = sk; | |
1995 | ||
a564b8f0 MG |
1996 | xs_set_memalloc(xprt); |
1997 | ||
16be2d20 CL |
1998 | write_unlock_bh(&sk->sk_callback_lock); |
1999 | } | |
2000 | xs_udp_do_set_buffer_size(xprt); | |
2001 | } | |
2002 | ||
8c14ff2a | 2003 | static void xs_udp_setup_socket(struct work_struct *work) |
a246b010 | 2004 | { |
34161db6 TM |
2005 | struct sock_xprt *transport = |
2006 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 2007 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 2008 | struct socket *sock = transport->sock; |
b65c0310 | 2009 | int status = -EIO; |
9903cd1c | 2010 | |
5cf02d09 JL |
2011 | current->flags |= PF_FSTRANS; |
2012 | ||
b0d93ad5 | 2013 | /* Start by resetting any existing state */ |
fe315e76 | 2014 | xs_reset_transport(transport); |
8c14ff2a PE |
2015 | sock = xs_create_sock(xprt, transport, |
2016 | xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); | |
b65c0310 | 2017 | if (IS_ERR(sock)) |
b0d93ad5 | 2018 | goto out; |
68e220bd | 2019 | |
c740eff8 CL |
2020 | dprintk("RPC: worker connecting xprt %p via %s to " |
2021 | "%s (port %s)\n", xprt, | |
2022 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2023 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2024 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
2025 | |
2026 | xs_udp_finish_connecting(xprt, sock); | |
b0d93ad5 CL |
2027 | status = 0; |
2028 | out: | |
b0d93ad5 | 2029 | xprt_clear_connecting(xprt); |
7d1e8255 | 2030 | xprt_wake_pending_tasks(xprt, status); |
5cf02d09 | 2031 | current->flags &= ~PF_FSTRANS; |
a246b010 CL |
2032 | } |
2033 | ||
3167e12c CL |
2034 | /* |
2035 | * We need to preserve the port number so the reply cache on the server can | |
2036 | * find our cached RPC replies when we get around to reconnecting. | |
2037 | */ | |
58dddac9 | 2038 | static void xs_abort_connection(struct sock_xprt *transport) |
3167e12c CL |
2039 | { |
2040 | int result; | |
3167e12c CL |
2041 | struct sockaddr any; |
2042 | ||
58dddac9 | 2043 | dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); |
3167e12c CL |
2044 | |
2045 | /* | |
2046 | * Disconnect the transport socket by doing a connect operation | |
2047 | * with AF_UNSPEC. This should return immediately... | |
2048 | */ | |
2049 | memset(&any, 0, sizeof(any)); | |
2050 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 2051 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
7d1e8255 | 2052 | if (!result) |
58dddac9 | 2053 | xs_sock_mark_closed(&transport->xprt); |
7d1e8255 | 2054 | else |
46121cf7 | 2055 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
2056 | result); |
2057 | } | |
2058 | ||
58dddac9 | 2059 | static void xs_tcp_reuse_connection(struct sock_xprt *transport) |
40d2549d TM |
2060 | { |
2061 | unsigned int state = transport->inet->sk_state; | |
2062 | ||
669502ff AC |
2063 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { |
2064 | /* we don't need to abort the connection if the socket | |
2065 | * hasn't undergone a shutdown | |
2066 | */ | |
2067 | if (transport->inet->sk_shutdown == 0) | |
2068 | return; | |
2069 | dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", | |
2070 | __func__, transport->inet->sk_shutdown); | |
2071 | } | |
2072 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { | |
2073 | /* we don't need to abort the connection if the socket | |
2074 | * hasn't undergone a shutdown | |
2075 | */ | |
2076 | if (transport->inet->sk_shutdown == 0) | |
2077 | return; | |
2078 | dprintk("RPC: %s: ESTABLISHED/SYN_SENT " | |
2079 | "sk_shutdown set to %d\n", | |
2080 | __func__, transport->inet->sk_shutdown); | |
2081 | } | |
58dddac9 | 2082 | xs_abort_connection(transport); |
40d2549d TM |
2083 | } |
2084 | ||
16be2d20 | 2085 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 2086 | { |
16be2d20 | 2087 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
fe19a96b | 2088 | int ret = -ENOTCONN; |
edb267a6 | 2089 | |
ee0ac0c2 | 2090 | if (!transport->inet) { |
b0d93ad5 CL |
2091 | struct sock *sk = sock->sk; |
2092 | ||
2093 | write_lock_bh(&sk->sk_callback_lock); | |
2094 | ||
2a9e1cfa TM |
2095 | xs_save_old_callbacks(transport, sk); |
2096 | ||
b0d93ad5 | 2097 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
2098 | sk->sk_data_ready = xs_tcp_data_ready; |
2099 | sk->sk_state_change = xs_tcp_state_change; | |
2100 | sk->sk_write_space = xs_tcp_write_space; | |
482f32e6 | 2101 | sk->sk_error_report = xs_error_report; |
b079fa7b | 2102 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
2103 | |
2104 | /* socket options */ | |
2105 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
2106 | sock_reset_flag(sk, SOCK_LINGER); | |
2107 | tcp_sk(sk)->linger2 = 0; | |
2108 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
2109 | |
2110 | xprt_clear_connected(xprt); | |
2111 | ||
2112 | /* Reset to new socket */ | |
ee0ac0c2 CL |
2113 | transport->sock = sock; |
2114 | transport->inet = sk; | |
b0d93ad5 CL |
2115 | |
2116 | write_unlock_bh(&sk->sk_callback_lock); | |
2117 | } | |
2118 | ||
01d37c42 | 2119 | if (!xprt_bound(xprt)) |
fe19a96b | 2120 | goto out; |
01d37c42 | 2121 | |
a564b8f0 MG |
2122 | xs_set_memalloc(xprt); |
2123 | ||
b0d93ad5 | 2124 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
2125 | xprt->stat.connect_count++; |
2126 | xprt->stat.connect_start = jiffies; | |
fe19a96b TM |
2127 | ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
2128 | switch (ret) { | |
2129 | case 0: | |
2130 | case -EINPROGRESS: | |
2131 | /* SYN_SENT! */ | |
2132 | xprt->connect_cookie++; | |
2133 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
2134 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2135 | } | |
2136 | out: | |
2137 | return ret; | |
16be2d20 CL |
2138 | } |
2139 | ||
9903cd1c | 2140 | /** |
b61d59ff TM |
2141 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
2142 | * @xprt: RPC transport to connect | |
2143 | * @transport: socket transport to connect | |
2144 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
2145 | * |
2146 | * Invoked by a work queue tasklet. | |
a246b010 | 2147 | */ |
cdd518d5 | 2148 | static void xs_tcp_setup_socket(struct work_struct *work) |
a246b010 | 2149 | { |
cdd518d5 PE |
2150 | struct sock_xprt *transport = |
2151 | container_of(work, struct sock_xprt, connect_worker.work); | |
ee0ac0c2 | 2152 | struct socket *sock = transport->sock; |
a9f5f0f7 | 2153 | struct rpc_xprt *xprt = &transport->xprt; |
b61d59ff | 2154 | int status = -EIO; |
a246b010 | 2155 | |
5cf02d09 JL |
2156 | current->flags |= PF_FSTRANS; |
2157 | ||
ee0ac0c2 | 2158 | if (!sock) { |
7d1e8255 | 2159 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
cdd518d5 PE |
2160 | sock = xs_create_sock(xprt, transport, |
2161 | xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); | |
b61d59ff TM |
2162 | if (IS_ERR(sock)) { |
2163 | status = PTR_ERR(sock); | |
3167e12c CL |
2164 | goto out; |
2165 | } | |
7d1e8255 TM |
2166 | } else { |
2167 | int abort_and_exit; | |
a246b010 | 2168 | |
7d1e8255 TM |
2169 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
2170 | &xprt->state); | |
3167e12c | 2171 | /* "close" the socket, preserving the local port */ |
58dddac9 | 2172 | xs_tcp_reuse_connection(transport); |
a246b010 | 2173 | |
7d1e8255 TM |
2174 | if (abort_and_exit) |
2175 | goto out_eagain; | |
2176 | } | |
a246b010 | 2177 | |
c740eff8 CL |
2178 | dprintk("RPC: worker connecting xprt %p via %s to " |
2179 | "%s (port %s)\n", xprt, | |
2180 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2181 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2182 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 2183 | |
16be2d20 | 2184 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 CL |
2185 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
2186 | xprt, -status, xprt_connected(xprt), | |
2187 | sock->sk->sk_state); | |
2a491991 | 2188 | switch (status) { |
f75e6745 TM |
2189 | default: |
2190 | printk("%s: connect returned unhandled error %d\n", | |
2191 | __func__, status); | |
2192 | case -EADDRNOTAVAIL: | |
2193 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
2194 | * and retry | |
2195 | */ | |
a519fc7a | 2196 | xs_tcp_force_close(xprt); |
88b5ed73 | 2197 | break; |
8a2cec29 TM |
2198 | case -ECONNREFUSED: |
2199 | case -ECONNRESET: | |
2200 | case -ENETUNREACH: | |
2201 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
2202 | case 0: |
2203 | case -EINPROGRESS: | |
2204 | case -EALREADY: | |
7d1e8255 | 2205 | xprt_clear_connecting(xprt); |
5cf02d09 | 2206 | current->flags &= ~PF_FSTRANS; |
7d1e8255 | 2207 | return; |
9fcfe0c8 TM |
2208 | case -EINVAL: |
2209 | /* Happens, for instance, if the user specified a link | |
2210 | * local IPv6 address without a scope-id. | |
2211 | */ | |
2212 | goto out; | |
a246b010 | 2213 | } |
7d1e8255 | 2214 | out_eagain: |
2a491991 | 2215 | status = -EAGAIN; |
a246b010 | 2216 | out: |
68e220bd | 2217 | xprt_clear_connecting(xprt); |
7d1e8255 | 2218 | xprt_wake_pending_tasks(xprt, status); |
5cf02d09 | 2219 | current->flags &= ~PF_FSTRANS; |
68e220bd | 2220 | } |
b0d93ad5 | 2221 | |
9903cd1c CL |
2222 | /** |
2223 | * xs_connect - connect a socket to a remote endpoint | |
2224 | * @task: address of RPC task that manages state of connect request | |
2225 | * | |
2226 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2227 | * |
2228 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2229 | * to guarantee that even unprivileged user processes can set up a | |
2230 | * socket on a privileged port. | |
2231 | * | |
2232 | * If a UDP socket connect fails, the delay behavior here prevents | |
2233 | * retry floods (hard mounts). | |
9903cd1c CL |
2234 | */ |
2235 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
2236 | { |
2237 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 2238 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2239 | |
09a21c41 | 2240 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
46121cf7 CL |
2241 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2242 | "seconds\n", | |
03bf4b70 | 2243 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2244 | queue_delayed_work(rpciod_workqueue, |
2245 | &transport->connect_worker, | |
2246 | xprt->reestablish_timeout); | |
03bf4b70 | 2247 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2248 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2249 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2250 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2251 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2252 | } else { |
46121cf7 | 2253 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2254 | queue_delayed_work(rpciod_workqueue, |
2255 | &transport->connect_worker, 0); | |
a246b010 CL |
2256 | } |
2257 | } | |
2258 | ||
176e21ee CL |
2259 | /** |
2260 | * xs_local_print_stats - display AF_LOCAL socket-specifc stats | |
2261 | * @xprt: rpc_xprt struct containing statistics | |
2262 | * @seq: output file | |
2263 | * | |
2264 | */ | |
2265 | static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2266 | { | |
2267 | long idle_time = 0; | |
2268 | ||
2269 | if (xprt_connected(xprt)) | |
2270 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2271 | ||
2272 | seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " | |
15a45206 | 2273 | "%llu %llu %lu %llu %llu\n", |
176e21ee CL |
2274 | xprt->stat.bind_count, |
2275 | xprt->stat.connect_count, | |
2276 | xprt->stat.connect_time, | |
2277 | idle_time, | |
2278 | xprt->stat.sends, | |
2279 | xprt->stat.recvs, | |
2280 | xprt->stat.bad_xids, | |
2281 | xprt->stat.req_u, | |
15a45206 AA |
2282 | xprt->stat.bklog_u, |
2283 | xprt->stat.max_slots, | |
2284 | xprt->stat.sending_u, | |
2285 | xprt->stat.pending_u); | |
176e21ee CL |
2286 | } |
2287 | ||
262ca07d CL |
2288 | /** |
2289 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2290 | * @xprt: rpc_xprt struct containing statistics | |
2291 | * @seq: output file | |
2292 | * | |
2293 | */ | |
2294 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2295 | { | |
c8475461 CL |
2296 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2297 | ||
15a45206 AA |
2298 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " |
2299 | "%lu %llu %llu\n", | |
fbfffbd5 | 2300 | transport->srcport, |
262ca07d CL |
2301 | xprt->stat.bind_count, |
2302 | xprt->stat.sends, | |
2303 | xprt->stat.recvs, | |
2304 | xprt->stat.bad_xids, | |
2305 | xprt->stat.req_u, | |
15a45206 AA |
2306 | xprt->stat.bklog_u, |
2307 | xprt->stat.max_slots, | |
2308 | xprt->stat.sending_u, | |
2309 | xprt->stat.pending_u); | |
262ca07d CL |
2310 | } |
2311 | ||
2312 | /** | |
2313 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2314 | * @xprt: rpc_xprt struct containing statistics | |
2315 | * @seq: output file | |
2316 | * | |
2317 | */ | |
2318 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2319 | { | |
c8475461 | 2320 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2321 | long idle_time = 0; |
2322 | ||
2323 | if (xprt_connected(xprt)) | |
2324 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2325 | ||
15a45206 AA |
2326 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " |
2327 | "%llu %llu %lu %llu %llu\n", | |
fbfffbd5 | 2328 | transport->srcport, |
262ca07d CL |
2329 | xprt->stat.bind_count, |
2330 | xprt->stat.connect_count, | |
2331 | xprt->stat.connect_time, | |
2332 | idle_time, | |
2333 | xprt->stat.sends, | |
2334 | xprt->stat.recvs, | |
2335 | xprt->stat.bad_xids, | |
2336 | xprt->stat.req_u, | |
15a45206 AA |
2337 | xprt->stat.bklog_u, |
2338 | xprt->stat.max_slots, | |
2339 | xprt->stat.sending_u, | |
2340 | xprt->stat.pending_u); | |
262ca07d CL |
2341 | } |
2342 | ||
4cfc7e60 RI |
2343 | /* |
2344 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2345 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2346 | * to use the server side send routines. | |
2347 | */ | |
5a51f13a | 2348 | static void *bc_malloc(struct rpc_task *task, size_t size) |
4cfc7e60 RI |
2349 | { |
2350 | struct page *page; | |
2351 | struct rpc_buffer *buf; | |
2352 | ||
2353 | BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); | |
2354 | page = alloc_page(GFP_KERNEL); | |
2355 | ||
2356 | if (!page) | |
2357 | return NULL; | |
2358 | ||
2359 | buf = page_address(page); | |
2360 | buf->len = PAGE_SIZE; | |
2361 | ||
2362 | return buf->data; | |
2363 | } | |
2364 | ||
2365 | /* | |
2366 | * Free the space allocated in the bc_alloc routine | |
2367 | */ | |
5a51f13a | 2368 | static void bc_free(void *buffer) |
4cfc7e60 RI |
2369 | { |
2370 | struct rpc_buffer *buf; | |
2371 | ||
2372 | if (!buffer) | |
2373 | return; | |
2374 | ||
2375 | buf = container_of(buffer, struct rpc_buffer, data); | |
2376 | free_page((unsigned long)buf); | |
2377 | } | |
2378 | ||
2379 | /* | |
2380 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2381 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2382 | */ | |
2383 | static int bc_sendto(struct rpc_rqst *req) | |
2384 | { | |
2385 | int len; | |
2386 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2387 | struct rpc_xprt *xprt = req->rq_xprt; | |
2388 | struct sock_xprt *transport = | |
2389 | container_of(xprt, struct sock_xprt, xprt); | |
2390 | struct socket *sock = transport->sock; | |
2391 | unsigned long headoff; | |
2392 | unsigned long tailoff; | |
2393 | ||
61677eee | 2394 | xs_encode_stream_record_marker(xbufp); |
4cfc7e60 RI |
2395 | |
2396 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2397 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2398 | len = svc_send_common(sock, xbufp, | |
2399 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2400 | xbufp->tail[0].iov_base, tailoff); | |
2401 | ||
2402 | if (len != xbufp->len) { | |
2403 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2404 | len = -EAGAIN; | |
2405 | } | |
2406 | ||
2407 | return len; | |
2408 | } | |
2409 | ||
2410 | /* | |
2411 | * The send routine. Borrows from svc_send | |
2412 | */ | |
2413 | static int bc_send_request(struct rpc_task *task) | |
2414 | { | |
2415 | struct rpc_rqst *req = task->tk_rqstp; | |
2416 | struct svc_xprt *xprt; | |
2417 | struct svc_sock *svsk; | |
2418 | u32 len; | |
2419 | ||
2420 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2421 | /* | |
2422 | * Get the server socket associated with this callback xprt | |
2423 | */ | |
2424 | xprt = req->rq_xprt->bc_xprt; | |
2425 | svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
2426 | ||
2427 | /* | |
2428 | * Grab the mutex to serialize data as the connection is shared | |
2429 | * with the fore channel | |
2430 | */ | |
2431 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2432 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2433 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2434 | return -EAGAIN; | |
2435 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2436 | } | |
2437 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2438 | len = -ENOTCONN; | |
2439 | else | |
2440 | len = bc_sendto(req); | |
2441 | mutex_unlock(&xprt->xpt_mutex); | |
2442 | ||
2443 | if (len > 0) | |
2444 | len = 0; | |
2445 | ||
2446 | return len; | |
2447 | } | |
2448 | ||
2449 | /* | |
2450 | * The close routine. Since this is client initiated, we do nothing | |
2451 | */ | |
2452 | ||
2453 | static void bc_close(struct rpc_xprt *xprt) | |
2454 | { | |
4cfc7e60 RI |
2455 | } |
2456 | ||
2457 | /* | |
2458 | * The xprt destroy routine. Again, because this connection is client | |
2459 | * initiated, we do nothing | |
2460 | */ | |
2461 | ||
2462 | static void bc_destroy(struct rpc_xprt *xprt) | |
2463 | { | |
4cfc7e60 RI |
2464 | } |
2465 | ||
176e21ee CL |
2466 | static struct rpc_xprt_ops xs_local_ops = { |
2467 | .reserve_xprt = xprt_reserve_xprt, | |
2468 | .release_xprt = xs_tcp_release_xprt, | |
f39c1bfb | 2469 | .alloc_slot = xprt_alloc_slot, |
176e21ee CL |
2470 | .rpcbind = xs_local_rpcbind, |
2471 | .set_port = xs_local_set_port, | |
2472 | .connect = xs_connect, | |
2473 | .buf_alloc = rpc_malloc, | |
2474 | .buf_free = rpc_free, | |
2475 | .send_request = xs_local_send_request, | |
2476 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2477 | .close = xs_close, | |
2478 | .destroy = xs_destroy, | |
2479 | .print_stats = xs_local_print_stats, | |
2480 | }; | |
2481 | ||
262965f5 | 2482 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2483 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2484 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2485 | .release_xprt = xprt_release_xprt_cong, |
f39c1bfb | 2486 | .alloc_slot = xprt_alloc_slot, |
45160d62 | 2487 | .rpcbind = rpcb_getport_async, |
92200412 | 2488 | .set_port = xs_set_port, |
262965f5 | 2489 | .connect = xs_connect, |
02107148 CL |
2490 | .buf_alloc = rpc_malloc, |
2491 | .buf_free = rpc_free, | |
262965f5 | 2492 | .send_request = xs_udp_send_request, |
fe3aca29 | 2493 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2494 | .timer = xs_udp_timer, |
a58dd398 | 2495 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2496 | .close = xs_close, |
2497 | .destroy = xs_destroy, | |
262ca07d | 2498 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2499 | }; |
2500 | ||
2501 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2502 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2503 | .release_xprt = xs_tcp_release_xprt, |
f39c1bfb | 2504 | .alloc_slot = xprt_lock_and_alloc_slot, |
45160d62 | 2505 | .rpcbind = rpcb_getport_async, |
92200412 | 2506 | .set_port = xs_set_port, |
0b9e7943 | 2507 | .connect = xs_connect, |
02107148 CL |
2508 | .buf_alloc = rpc_malloc, |
2509 | .buf_free = rpc_free, | |
262965f5 | 2510 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2511 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
f75e6745 | 2512 | .close = xs_tcp_close, |
9903cd1c | 2513 | .destroy = xs_destroy, |
262ca07d | 2514 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2515 | }; |
2516 | ||
4cfc7e60 RI |
2517 | /* |
2518 | * The rpc_xprt_ops for the server backchannel | |
2519 | */ | |
2520 | ||
2521 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2522 | .reserve_xprt = xprt_reserve_xprt, | |
2523 | .release_xprt = xprt_release_xprt, | |
84e28a30 | 2524 | .alloc_slot = xprt_alloc_slot, |
92769108 | 2525 | .rpcbind = xs_local_rpcbind, |
4cfc7e60 RI |
2526 | .buf_alloc = bc_malloc, |
2527 | .buf_free = bc_free, | |
2528 | .send_request = bc_send_request, | |
2529 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2530 | .close = bc_close, | |
2531 | .destroy = bc_destroy, | |
2532 | .print_stats = xs_tcp_print_stats, | |
2533 | }; | |
2534 | ||
92476850 CL |
2535 | static int xs_init_anyaddr(const int family, struct sockaddr *sap) |
2536 | { | |
2537 | static const struct sockaddr_in sin = { | |
2538 | .sin_family = AF_INET, | |
2539 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
2540 | }; | |
2541 | static const struct sockaddr_in6 sin6 = { | |
2542 | .sin6_family = AF_INET6, | |
2543 | .sin6_addr = IN6ADDR_ANY_INIT, | |
2544 | }; | |
2545 | ||
2546 | switch (family) { | |
176e21ee CL |
2547 | case AF_LOCAL: |
2548 | break; | |
92476850 CL |
2549 | case AF_INET: |
2550 | memcpy(sap, &sin, sizeof(sin)); | |
2551 | break; | |
2552 | case AF_INET6: | |
2553 | memcpy(sap, &sin6, sizeof(sin6)); | |
2554 | break; | |
2555 | default: | |
2556 | dprintk("RPC: %s: Bad address family\n", __func__); | |
2557 | return -EAFNOSUPPORT; | |
2558 | } | |
2559 | return 0; | |
2560 | } | |
2561 | ||
3c341b0b | 2562 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
d9ba131d TM |
2563 | unsigned int slot_table_size, |
2564 | unsigned int max_slot_table_size) | |
c8541ecd CL |
2565 | { |
2566 | struct rpc_xprt *xprt; | |
ffc2e518 | 2567 | struct sock_xprt *new; |
c8541ecd | 2568 | |
96802a09 | 2569 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2570 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2571 | return ERR_PTR(-EBADF); |
2572 | } | |
2573 | ||
d9ba131d TM |
2574 | xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, |
2575 | max_slot_table_size); | |
bd1722d4 | 2576 | if (xprt == NULL) { |
46121cf7 CL |
2577 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2578 | "rpc_xprt\n"); | |
c8541ecd CL |
2579 | return ERR_PTR(-ENOMEM); |
2580 | } | |
c8541ecd | 2581 | |
bd1722d4 | 2582 | new = container_of(xprt, struct sock_xprt, xprt); |
96802a09 FM |
2583 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2584 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2585 | if (args->srcaddr) |
fbfffbd5 | 2586 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
92476850 CL |
2587 | else { |
2588 | int err; | |
2589 | err = xs_init_anyaddr(args->dstaddr->sa_family, | |
2590 | (struct sockaddr *)&new->srcaddr); | |
2aa13531 SK |
2591 | if (err != 0) { |
2592 | xprt_free(xprt); | |
92476850 | 2593 | return ERR_PTR(err); |
2aa13531 | 2594 | } |
92476850 | 2595 | } |
c8541ecd CL |
2596 | |
2597 | return xprt; | |
2598 | } | |
2599 | ||
176e21ee CL |
2600 | static const struct rpc_timeout xs_local_default_timeout = { |
2601 | .to_initval = 10 * HZ, | |
2602 | .to_maxval = 10 * HZ, | |
2603 | .to_retries = 2, | |
2604 | }; | |
2605 | ||
2606 | /** | |
2607 | * xs_setup_local - Set up transport to use an AF_LOCAL socket | |
2608 | * @args: rpc transport creation arguments | |
2609 | * | |
2610 | * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP | |
2611 | */ | |
2612 | static struct rpc_xprt *xs_setup_local(struct xprt_create *args) | |
2613 | { | |
2614 | struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; | |
2615 | struct sock_xprt *transport; | |
2616 | struct rpc_xprt *xprt; | |
2617 | struct rpc_xprt *ret; | |
2618 | ||
d9ba131d TM |
2619 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2620 | xprt_max_tcp_slot_table_entries); | |
176e21ee CL |
2621 | if (IS_ERR(xprt)) |
2622 | return xprt; | |
2623 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2624 | ||
2625 | xprt->prot = 0; | |
2626 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2627 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2628 | ||
2629 | xprt->bind_timeout = XS_BIND_TO; | |
2630 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2631 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
2632 | ||
2633 | xprt->ops = &xs_local_ops; | |
2634 | xprt->timeout = &xs_local_default_timeout; | |
2635 | ||
2636 | switch (sun->sun_family) { | |
2637 | case AF_LOCAL: | |
2638 | if (sun->sun_path[0] != '/') { | |
2639 | dprintk("RPC: bad AF_LOCAL address: %s\n", | |
2640 | sun->sun_path); | |
2641 | ret = ERR_PTR(-EINVAL); | |
2642 | goto out_err; | |
2643 | } | |
2644 | xprt_set_bound(xprt); | |
2645 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2646 | xs_local_setup_socket); | |
2647 | xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); | |
2648 | break; | |
2649 | default: | |
2650 | ret = ERR_PTR(-EAFNOSUPPORT); | |
2651 | goto out_err; | |
2652 | } | |
2653 | ||
2654 | dprintk("RPC: set up xprt to %s via AF_LOCAL\n", | |
2655 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2656 | ||
2657 | if (try_module_get(THIS_MODULE)) | |
2658 | return xprt; | |
2659 | ret = ERR_PTR(-EINVAL); | |
2660 | out_err: | |
2661 | xprt_free(xprt); | |
2662 | return ret; | |
2663 | } | |
2664 | ||
2881ae74 TM |
2665 | static const struct rpc_timeout xs_udp_default_timeout = { |
2666 | .to_initval = 5 * HZ, | |
2667 | .to_maxval = 30 * HZ, | |
2668 | .to_increment = 5 * HZ, | |
2669 | .to_retries = 5, | |
2670 | }; | |
2671 | ||
9903cd1c CL |
2672 | /** |
2673 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2674 | * @args: rpc transport creation arguments |
9903cd1c CL |
2675 | * |
2676 | */ | |
483066d6 | 2677 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2678 | { |
8f9d5b1a | 2679 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2680 | struct rpc_xprt *xprt; |
c8475461 | 2681 | struct sock_xprt *transport; |
0a68b0be | 2682 | struct rpc_xprt *ret; |
a246b010 | 2683 | |
d9ba131d TM |
2684 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, |
2685 | xprt_udp_slot_table_entries); | |
c8541ecd CL |
2686 | if (IS_ERR(xprt)) |
2687 | return xprt; | |
c8475461 | 2688 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2689 | |
ec739ef0 | 2690 | xprt->prot = IPPROTO_UDP; |
808012fb | 2691 | xprt->tsh_size = 0; |
a246b010 CL |
2692 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2693 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2694 | ||
03bf4b70 | 2695 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2696 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2697 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2698 | |
262965f5 | 2699 | xprt->ops = &xs_udp_ops; |
a246b010 | 2700 | |
ba7392bb | 2701 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2702 | |
8f9d5b1a CL |
2703 | switch (addr->sa_family) { |
2704 | case AF_INET: | |
2705 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2706 | xprt_set_bound(xprt); | |
2707 | ||
2708 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2709 | xs_udp_setup_socket); |
9dc3b095 | 2710 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2711 | break; |
2712 | case AF_INET6: | |
2713 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2714 | xprt_set_bound(xprt); | |
2715 | ||
2716 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2717 | xs_udp_setup_socket); |
9dc3b095 | 2718 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2719 | break; |
2720 | default: | |
0a68b0be BF |
2721 | ret = ERR_PTR(-EAFNOSUPPORT); |
2722 | goto out_err; | |
8f9d5b1a CL |
2723 | } |
2724 | ||
c740eff8 CL |
2725 | if (xprt_bound(xprt)) |
2726 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2727 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2728 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2729 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2730 | else | |
2731 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2732 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2733 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2734 | |
bc25571e TT |
2735 | if (try_module_get(THIS_MODULE)) |
2736 | return xprt; | |
0a68b0be BF |
2737 | ret = ERR_PTR(-EINVAL); |
2738 | out_err: | |
e204e621 | 2739 | xprt_free(xprt); |
0a68b0be | 2740 | return ret; |
a246b010 CL |
2741 | } |
2742 | ||
2881ae74 TM |
2743 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2744 | .to_initval = 60 * HZ, | |
2745 | .to_maxval = 60 * HZ, | |
2746 | .to_retries = 2, | |
2747 | }; | |
2748 | ||
9903cd1c CL |
2749 | /** |
2750 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2751 | * @args: rpc transport creation arguments |
9903cd1c CL |
2752 | * |
2753 | */ | |
483066d6 | 2754 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2755 | { |
8f9d5b1a | 2756 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2757 | struct rpc_xprt *xprt; |
c8475461 | 2758 | struct sock_xprt *transport; |
0a68b0be | 2759 | struct rpc_xprt *ret; |
a246b010 | 2760 | |
d9ba131d TM |
2761 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2762 | xprt_max_tcp_slot_table_entries); | |
c8541ecd CL |
2763 | if (IS_ERR(xprt)) |
2764 | return xprt; | |
c8475461 | 2765 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2766 | |
ec739ef0 | 2767 | xprt->prot = IPPROTO_TCP; |
808012fb | 2768 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2769 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2770 | |
03bf4b70 | 2771 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2772 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2773 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2774 | |
262965f5 | 2775 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2776 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2777 | |
8f9d5b1a CL |
2778 | switch (addr->sa_family) { |
2779 | case AF_INET: | |
2780 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2781 | xprt_set_bound(xprt); | |
2782 | ||
9dc3b095 | 2783 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2784 | xs_tcp_setup_socket); |
9dc3b095 | 2785 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2786 | break; |
2787 | case AF_INET6: | |
2788 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2789 | xprt_set_bound(xprt); | |
2790 | ||
9dc3b095 | 2791 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2792 | xs_tcp_setup_socket); |
9dc3b095 | 2793 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2794 | break; |
2795 | default: | |
0a68b0be BF |
2796 | ret = ERR_PTR(-EAFNOSUPPORT); |
2797 | goto out_err; | |
8f9d5b1a CL |
2798 | } |
2799 | ||
c740eff8 CL |
2800 | if (xprt_bound(xprt)) |
2801 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2802 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2803 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2804 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2805 | else | |
2806 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2807 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2808 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2809 | ||
edb267a6 | 2810 | |
bc25571e TT |
2811 | if (try_module_get(THIS_MODULE)) |
2812 | return xprt; | |
0a68b0be BF |
2813 | ret = ERR_PTR(-EINVAL); |
2814 | out_err: | |
e204e621 | 2815 | xprt_free(xprt); |
0a68b0be | 2816 | return ret; |
a246b010 | 2817 | } |
282b32e1 | 2818 | |
f300baba AB |
2819 | /** |
2820 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2821 | * @args: rpc transport creation arguments | |
2822 | * | |
2823 | */ | |
2824 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2825 | { | |
2826 | struct sockaddr *addr = args->dstaddr; | |
2827 | struct rpc_xprt *xprt; | |
2828 | struct sock_xprt *transport; | |
2829 | struct svc_sock *bc_sock; | |
0a68b0be | 2830 | struct rpc_xprt *ret; |
f300baba | 2831 | |
f0418aa4 BF |
2832 | if (args->bc_xprt->xpt_bc_xprt) { |
2833 | /* | |
2834 | * This server connection already has a backchannel | |
2835 | * export; we can't create a new one, as we wouldn't be | |
2836 | * able to match replies based on xid any more. So, | |
2837 | * reuse the already-existing one: | |
2838 | */ | |
2839 | return args->bc_xprt->xpt_bc_xprt; | |
2840 | } | |
d9ba131d TM |
2841 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2842 | xprt_tcp_slot_table_entries); | |
f300baba AB |
2843 | if (IS_ERR(xprt)) |
2844 | return xprt; | |
2845 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2846 | ||
2847 | xprt->prot = IPPROTO_TCP; | |
2848 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2849 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2850 | xprt->timeout = &xs_tcp_default_timeout; | |
2851 | ||
2852 | /* backchannel */ | |
2853 | xprt_set_bound(xprt); | |
2854 | xprt->bind_timeout = 0; | |
f300baba AB |
2855 | xprt->reestablish_timeout = 0; |
2856 | xprt->idle_timeout = 0; | |
2857 | ||
f300baba AB |
2858 | xprt->ops = &bc_tcp_ops; |
2859 | ||
2860 | switch (addr->sa_family) { | |
2861 | case AF_INET: | |
2862 | xs_format_peer_addresses(xprt, "tcp", | |
2863 | RPCBIND_NETID_TCP); | |
2864 | break; | |
2865 | case AF_INET6: | |
2866 | xs_format_peer_addresses(xprt, "tcp", | |
2867 | RPCBIND_NETID_TCP6); | |
2868 | break; | |
2869 | default: | |
0a68b0be BF |
2870 | ret = ERR_PTR(-EAFNOSUPPORT); |
2871 | goto out_err; | |
f300baba AB |
2872 | } |
2873 | ||
50fa0d40 PE |
2874 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2875 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2876 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2877 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
f300baba | 2878 | |
99de8ea9 BF |
2879 | /* |
2880 | * Once we've associated a backchannel xprt with a connection, | |
2881 | * we want to keep it around as long as long as the connection | |
2882 | * lasts, in case we need to start using it for a backchannel | |
2883 | * again; this reference won't be dropped until bc_xprt is | |
2884 | * destroyed. | |
2885 | */ | |
2886 | xprt_get(xprt); | |
2887 | args->bc_xprt->xpt_bc_xprt = xprt; | |
2888 | xprt->bc_xprt = args->bc_xprt; | |
2889 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
2890 | transport->sock = bc_sock->sk_sock; | |
2891 | transport->inet = bc_sock->sk_sk; | |
2892 | ||
f300baba AB |
2893 | /* |
2894 | * Since we don't want connections for the backchannel, we set | |
2895 | * the xprt status to connected | |
2896 | */ | |
2897 | xprt_set_connected(xprt); | |
2898 | ||
2899 | ||
2900 | if (try_module_get(THIS_MODULE)) | |
2901 | return xprt; | |
99de8ea9 | 2902 | xprt_put(xprt); |
0a68b0be BF |
2903 | ret = ERR_PTR(-EINVAL); |
2904 | out_err: | |
e204e621 | 2905 | xprt_free(xprt); |
0a68b0be | 2906 | return ret; |
f300baba AB |
2907 | } |
2908 | ||
176e21ee CL |
2909 | static struct xprt_class xs_local_transport = { |
2910 | .list = LIST_HEAD_INIT(xs_local_transport.list), | |
2911 | .name = "named UNIX socket", | |
2912 | .owner = THIS_MODULE, | |
2913 | .ident = XPRT_TRANSPORT_LOCAL, | |
2914 | .setup = xs_setup_local, | |
2915 | }; | |
2916 | ||
bc25571e TT |
2917 | static struct xprt_class xs_udp_transport = { |
2918 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2919 | .name = "udp", | |
2920 | .owner = THIS_MODULE, | |
f300baba | 2921 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
2922 | .setup = xs_setup_udp, |
2923 | }; | |
2924 | ||
2925 | static struct xprt_class xs_tcp_transport = { | |
2926 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2927 | .name = "tcp", | |
2928 | .owner = THIS_MODULE, | |
f300baba | 2929 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
2930 | .setup = xs_setup_tcp, |
2931 | }; | |
2932 | ||
f300baba AB |
2933 | static struct xprt_class xs_bc_tcp_transport = { |
2934 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
2935 | .name = "tcp NFSv4.1 backchannel", | |
2936 | .owner = THIS_MODULE, | |
2937 | .ident = XPRT_TRANSPORT_BC_TCP, | |
2938 | .setup = xs_setup_bc_tcp, | |
2939 | }; | |
2940 | ||
282b32e1 | 2941 | /** |
bc25571e | 2942 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2943 | * |
2944 | */ | |
2945 | int init_socket_xprt(void) | |
2946 | { | |
fbf76683 | 2947 | #ifdef RPC_DEBUG |
2b1bec5f | 2948 | if (!sunrpc_table_header) |
0b4d4147 | 2949 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2950 | #endif |
2951 | ||
176e21ee | 2952 | xprt_register_transport(&xs_local_transport); |
bc25571e TT |
2953 | xprt_register_transport(&xs_udp_transport); |
2954 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 2955 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 2956 | |
282b32e1 CL |
2957 | return 0; |
2958 | } | |
2959 | ||
2960 | /** | |
bc25571e | 2961 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2962 | * |
2963 | */ | |
2964 | void cleanup_socket_xprt(void) | |
2965 | { | |
fbf76683 CL |
2966 | #ifdef RPC_DEBUG |
2967 | if (sunrpc_table_header) { | |
2968 | unregister_sysctl_table(sunrpc_table_header); | |
2969 | sunrpc_table_header = NULL; | |
2970 | } | |
2971 | #endif | |
bc25571e | 2972 | |
176e21ee | 2973 | xprt_unregister_transport(&xs_local_transport); |
bc25571e TT |
2974 | xprt_unregister_transport(&xs_udp_transport); |
2975 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 2976 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 2977 | } |
cbf11071 | 2978 | |
9bbb9e5a RR |
2979 | static int param_set_uint_minmax(const char *val, |
2980 | const struct kernel_param *kp, | |
cbf11071 TM |
2981 | unsigned int min, unsigned int max) |
2982 | { | |
2983 | unsigned long num; | |
2984 | int ret; | |
2985 | ||
2986 | if (!val) | |
2987 | return -EINVAL; | |
2988 | ret = strict_strtoul(val, 0, &num); | |
2989 | if (ret == -EINVAL || num < min || num > max) | |
2990 | return -EINVAL; | |
2991 | *((unsigned int *)kp->arg) = num; | |
2992 | return 0; | |
2993 | } | |
2994 | ||
9bbb9e5a | 2995 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
cbf11071 TM |
2996 | { |
2997 | return param_set_uint_minmax(val, kp, | |
2998 | RPC_MIN_RESVPORT, | |
2999 | RPC_MAX_RESVPORT); | |
3000 | } | |
3001 | ||
9bbb9e5a RR |
3002 | static struct kernel_param_ops param_ops_portnr = { |
3003 | .set = param_set_portnr, | |
3004 | .get = param_get_uint, | |
3005 | }; | |
3006 | ||
cbf11071 TM |
3007 | #define param_check_portnr(name, p) \ |
3008 | __param_check(name, p, unsigned int); | |
3009 | ||
3010 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
3011 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
3012 | ||
9bbb9e5a RR |
3013 | static int param_set_slot_table_size(const char *val, |
3014 | const struct kernel_param *kp) | |
cbf11071 TM |
3015 | { |
3016 | return param_set_uint_minmax(val, kp, | |
3017 | RPC_MIN_SLOT_TABLE, | |
3018 | RPC_MAX_SLOT_TABLE); | |
3019 | } | |
3020 | ||
9bbb9e5a RR |
3021 | static struct kernel_param_ops param_ops_slot_table_size = { |
3022 | .set = param_set_slot_table_size, | |
3023 | .get = param_get_uint, | |
3024 | }; | |
3025 | ||
cbf11071 TM |
3026 | #define param_check_slot_table_size(name, p) \ |
3027 | __param_check(name, p, unsigned int); | |
3028 | ||
d9ba131d TM |
3029 | static int param_set_max_slot_table_size(const char *val, |
3030 | const struct kernel_param *kp) | |
3031 | { | |
3032 | return param_set_uint_minmax(val, kp, | |
3033 | RPC_MIN_SLOT_TABLE, | |
3034 | RPC_MAX_SLOT_TABLE_LIMIT); | |
3035 | } | |
3036 | ||
3037 | static struct kernel_param_ops param_ops_max_slot_table_size = { | |
3038 | .set = param_set_max_slot_table_size, | |
3039 | .get = param_get_uint, | |
3040 | }; | |
3041 | ||
3042 | #define param_check_max_slot_table_size(name, p) \ | |
3043 | __param_check(name, p, unsigned int); | |
3044 | ||
cbf11071 TM |
3045 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
3046 | slot_table_size, 0644); | |
d9ba131d TM |
3047 | module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, |
3048 | max_slot_table_size, 0644); | |
cbf11071 TM |
3049 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
3050 | slot_table_size, 0644); | |
3051 |