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 *); | |
ffc2e518 CL |
257 | }; |
258 | ||
e136d092 CL |
259 | /* |
260 | * TCP receive state flags | |
261 | */ | |
262 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
263 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
264 | #define TCP_RCV_COPY_XID (1UL << 2) | |
265 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
266 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
267 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
268 | |
269 | /* | |
270 | * TCP RPC flags | |
271 | */ | |
f4a2e418 | 272 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 273 | |
95392c59 CL |
274 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
275 | { | |
276 | return (struct sockaddr *) &xprt->addr; | |
277 | } | |
278 | ||
176e21ee CL |
279 | static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) |
280 | { | |
281 | return (struct sockaddr_un *) &xprt->addr; | |
282 | } | |
283 | ||
95392c59 | 284 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
edb267a6 | 285 | { |
95392c59 CL |
286 | return (struct sockaddr_in *) &xprt->addr; |
287 | } | |
288 | ||
289 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
290 | { | |
291 | return (struct sockaddr_in6 *) &xprt->addr; | |
292 | } | |
293 | ||
c877b849 | 294 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 295 | { |
c877b849 | 296 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
297 | struct sockaddr_in6 *sin6; |
298 | struct sockaddr_in *sin; | |
176e21ee | 299 | struct sockaddr_un *sun; |
c877b849 | 300 | char buf[128]; |
edb267a6 | 301 | |
9dc3b095 | 302 | switch (sap->sa_family) { |
176e21ee CL |
303 | case AF_LOCAL: |
304 | sun = xs_addr_un(xprt); | |
305 | strlcpy(buf, sun->sun_path, sizeof(buf)); | |
306 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
307 | kstrdup(buf, GFP_KERNEL); | |
308 | break; | |
9dc3b095 | 309 | case AF_INET: |
176e21ee CL |
310 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
311 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
312 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 313 | sin = xs_addr_in(xprt); |
fc0b5791 | 314 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
9dc3b095 CL |
315 | break; |
316 | case AF_INET6: | |
176e21ee CL |
317 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
318 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
319 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 320 | sin6 = xs_addr_in6(xprt); |
fc0b5791 | 321 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
9dc3b095 CL |
322 | break; |
323 | default: | |
324 | BUG(); | |
756805e7 | 325 | } |
176e21ee | 326 | |
9dc3b095 | 327 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
328 | } |
329 | ||
9dc3b095 | 330 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 331 | { |
9dc3b095 CL |
332 | struct sockaddr *sap = xs_addr(xprt); |
333 | char buf[128]; | |
4b6473fb | 334 | |
81160e66 | 335 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 336 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
4b6473fb | 337 | |
81160e66 | 338 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 CL |
339 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
340 | } | |
4b6473fb | 341 | |
9dc3b095 CL |
342 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
343 | const char *protocol, | |
344 | const char *netid) | |
c877b849 | 345 | { |
b454ae90 | 346 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 347 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 348 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 349 | xs_format_common_peer_ports(xprt); |
edb267a6 | 350 | } |
4b6473fb | 351 | |
9dc3b095 | 352 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 353 | { |
9dc3b095 CL |
354 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
355 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 356 | |
9dc3b095 | 357 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
358 | } |
359 | ||
360 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
361 | { | |
33e01dc7 CL |
362 | unsigned int i; |
363 | ||
364 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
365 | switch (i) { | |
366 | case RPC_DISPLAY_PROTO: | |
367 | case RPC_DISPLAY_NETID: | |
368 | continue; | |
369 | default: | |
370 | kfree(xprt->address_strings[i]); | |
371 | } | |
edb267a6 CL |
372 | } |
373 | ||
b4b5cc85 CL |
374 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
375 | ||
24c5684b | 376 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 377 | { |
b4b5cc85 CL |
378 | struct msghdr msg = { |
379 | .msg_name = addr, | |
380 | .msg_namelen = addrlen, | |
24c5684b TM |
381 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
382 | }; | |
383 | struct kvec iov = { | |
384 | .iov_base = vec->iov_base + base, | |
385 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
386 | }; |
387 | ||
24c5684b | 388 | if (iov.iov_len != 0) |
b4b5cc85 CL |
389 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
390 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
391 | } | |
392 | ||
24c5684b | 393 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 394 | { |
24c5684b TM |
395 | struct page **ppage; |
396 | unsigned int remainder; | |
397 | int err, sent = 0; | |
398 | ||
399 | remainder = xdr->page_len - base; | |
400 | base += xdr->page_base; | |
401 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
402 | base &= ~PAGE_MASK; | |
403 | for(;;) { | |
404 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
405 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 406 | |
24c5684b TM |
407 | remainder -= len; |
408 | if (remainder != 0 || more) | |
409 | flags |= MSG_MORE; | |
410 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
411 | if (remainder == 0 || err != len) | |
412 | break; | |
413 | sent += err; | |
414 | ppage++; | |
415 | base = 0; | |
416 | } | |
417 | if (sent == 0) | |
418 | return err; | |
419 | if (err > 0) | |
420 | sent += err; | |
421 | return sent; | |
b4b5cc85 CL |
422 | } |
423 | ||
9903cd1c CL |
424 | /** |
425 | * xs_sendpages - write pages directly to a socket | |
426 | * @sock: socket to send on | |
427 | * @addr: UDP only -- address of destination | |
428 | * @addrlen: UDP only -- length of destination address | |
429 | * @xdr: buffer containing this request | |
430 | * @base: starting position in the buffer | |
431 | * | |
a246b010 | 432 | */ |
24c5684b | 433 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 434 | { |
24c5684b TM |
435 | unsigned int remainder = xdr->len - base; |
436 | int err, sent = 0; | |
a246b010 | 437 | |
262965f5 | 438 | if (unlikely(!sock)) |
fba91afb | 439 | return -ENOTSOCK; |
262965f5 CL |
440 | |
441 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
442 | if (base != 0) { |
443 | addr = NULL; | |
444 | addrlen = 0; | |
445 | } | |
262965f5 | 446 | |
24c5684b TM |
447 | if (base < xdr->head[0].iov_len || addr != NULL) { |
448 | unsigned int len = xdr->head[0].iov_len - base; | |
449 | remainder -= len; | |
450 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
451 | if (remainder == 0 || err != len) | |
a246b010 | 452 | goto out; |
24c5684b | 453 | sent += err; |
a246b010 CL |
454 | base = 0; |
455 | } else | |
24c5684b | 456 | base -= xdr->head[0].iov_len; |
a246b010 | 457 | |
24c5684b TM |
458 | if (base < xdr->page_len) { |
459 | unsigned int len = xdr->page_len - base; | |
460 | remainder -= len; | |
461 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
462 | if (remainder == 0 || err != len) | |
a246b010 | 463 | goto out; |
24c5684b | 464 | sent += err; |
a246b010 | 465 | base = 0; |
24c5684b TM |
466 | } else |
467 | base -= xdr->page_len; | |
468 | ||
469 | if (base >= xdr->tail[0].iov_len) | |
470 | return sent; | |
471 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 472 | out: |
24c5684b TM |
473 | if (sent == 0) |
474 | return err; | |
475 | if (err > 0) | |
476 | sent += err; | |
477 | return sent; | |
a246b010 CL |
478 | } |
479 | ||
b6ddf64f TM |
480 | static void xs_nospace_callback(struct rpc_task *task) |
481 | { | |
482 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
483 | ||
484 | transport->inet->sk_write_pending--; | |
485 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
486 | } | |
487 | ||
9903cd1c | 488 | /** |
262965f5 CL |
489 | * xs_nospace - place task on wait queue if transmit was incomplete |
490 | * @task: task to put to sleep | |
9903cd1c | 491 | * |
a246b010 | 492 | */ |
5e3771ce | 493 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 494 | { |
262965f5 CL |
495 | struct rpc_rqst *req = task->tk_rqstp; |
496 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 497 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
24ca9a84 | 498 | int ret = -EAGAIN; |
a246b010 | 499 | |
46121cf7 | 500 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
501 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
502 | req->rq_slen); | |
503 | ||
b6ddf64f TM |
504 | /* Protect against races with write_space */ |
505 | spin_lock_bh(&xprt->transport_lock); | |
506 | ||
507 | /* Don't race with disconnect */ | |
508 | if (xprt_connected(xprt)) { | |
509 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
510 | /* | |
511 | * Notify TCP that we're limited by the application | |
512 | * window size | |
513 | */ | |
514 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
515 | transport->inet->sk_write_pending++; | |
516 | /* ...and wait for more buffer space */ | |
517 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
518 | } | |
519 | } else { | |
520 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 521 | ret = -ENOTCONN; |
b6ddf64f | 522 | } |
262965f5 | 523 | |
b6ddf64f | 524 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 525 | return ret; |
262965f5 CL |
526 | } |
527 | ||
61677eee CL |
528 | /* |
529 | * Construct a stream transport record marker in @buf. | |
530 | */ | |
531 | static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) | |
532 | { | |
533 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
534 | rpc_fraghdr *base = buf->head[0].iov_base; | |
535 | *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); | |
536 | } | |
537 | ||
176e21ee CL |
538 | /** |
539 | * xs_local_send_request - write an RPC request to an AF_LOCAL socket | |
540 | * @task: RPC task that manages the state of an RPC request | |
541 | * | |
542 | * Return values: | |
543 | * 0: The request has been sent | |
544 | * EAGAIN: The socket was blocked, please call again later to | |
545 | * complete the request | |
546 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
547 | * other: Some other error occured, the request was not sent | |
548 | */ | |
549 | static int xs_local_send_request(struct rpc_task *task) | |
550 | { | |
551 | struct rpc_rqst *req = task->tk_rqstp; | |
552 | struct rpc_xprt *xprt = req->rq_xprt; | |
553 | struct sock_xprt *transport = | |
554 | container_of(xprt, struct sock_xprt, xprt); | |
555 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
556 | int status; | |
557 | ||
558 | xs_encode_stream_record_marker(&req->rq_snd_buf); | |
559 | ||
560 | xs_pktdump("packet data:", | |
561 | req->rq_svec->iov_base, req->rq_svec->iov_len); | |
562 | ||
563 | status = xs_sendpages(transport->sock, NULL, 0, | |
564 | xdr, req->rq_bytes_sent); | |
565 | dprintk("RPC: %s(%u) = %d\n", | |
566 | __func__, xdr->len - req->rq_bytes_sent, status); | |
567 | if (likely(status >= 0)) { | |
568 | req->rq_bytes_sent += status; | |
569 | req->rq_xmit_bytes_sent += status; | |
570 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { | |
571 | req->rq_bytes_sent = 0; | |
572 | return 0; | |
573 | } | |
574 | status = -EAGAIN; | |
575 | } | |
576 | ||
577 | switch (status) { | |
578 | case -EAGAIN: | |
579 | status = xs_nospace(task); | |
580 | break; | |
581 | default: | |
582 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
583 | -status); | |
584 | case -EPIPE: | |
585 | xs_close(xprt); | |
586 | status = -ENOTCONN; | |
587 | } | |
588 | ||
589 | return status; | |
590 | } | |
591 | ||
262965f5 CL |
592 | /** |
593 | * xs_udp_send_request - write an RPC request to a UDP socket | |
594 | * @task: address of RPC task that manages the state of an RPC request | |
595 | * | |
596 | * Return values: | |
597 | * 0: The request has been sent | |
598 | * EAGAIN: The socket was blocked, please call again later to | |
599 | * complete the request | |
600 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 601 | * other: Some other error occurred, the request was not sent |
262965f5 CL |
602 | */ |
603 | static int xs_udp_send_request(struct rpc_task *task) | |
604 | { | |
605 | struct rpc_rqst *req = task->tk_rqstp; | |
606 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 607 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
608 | struct xdr_buf *xdr = &req->rq_snd_buf; |
609 | int status; | |
a246b010 | 610 | |
9903cd1c | 611 | xs_pktdump("packet data:", |
a246b010 CL |
612 | req->rq_svec->iov_base, |
613 | req->rq_svec->iov_len); | |
614 | ||
01d37c42 TM |
615 | if (!xprt_bound(xprt)) |
616 | return -ENOTCONN; | |
ee0ac0c2 | 617 | status = xs_sendpages(transport->sock, |
95392c59 | 618 | xs_addr(xprt), |
ee0ac0c2 CL |
619 | xprt->addrlen, xdr, |
620 | req->rq_bytes_sent); | |
a246b010 | 621 | |
46121cf7 | 622 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 623 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 624 | |
2199700f | 625 | if (status >= 0) { |
d60dbb20 | 626 | req->rq_xmit_bytes_sent += status; |
2199700f TM |
627 | if (status >= req->rq_slen) |
628 | return 0; | |
629 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 630 | status = -EAGAIN; |
2199700f | 631 | } |
a246b010 | 632 | |
262965f5 | 633 | switch (status) { |
fba91afb TM |
634 | case -ENOTSOCK: |
635 | status = -ENOTCONN; | |
636 | /* Should we call xs_close() here? */ | |
637 | break; | |
b6ddf64f | 638 | case -EAGAIN: |
5e3771ce | 639 | status = xs_nospace(task); |
b6ddf64f | 640 | break; |
c8485e4d TM |
641 | default: |
642 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
643 | -status); | |
262965f5 CL |
644 | case -ENETUNREACH: |
645 | case -EPIPE: | |
a246b010 CL |
646 | case -ECONNREFUSED: |
647 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 648 | * prompts ECONNREFUSED. */ |
b6ddf64f | 649 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 650 | } |
5fe46e9d | 651 | |
262965f5 | 652 | return status; |
a246b010 CL |
653 | } |
654 | ||
e06799f9 TM |
655 | /** |
656 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
657 | * @xprt: transport | |
658 | * | |
659 | * Initiates a graceful shutdown of the TCP socket by calling the | |
660 | * equivalent of shutdown(SHUT_WR); | |
661 | */ | |
662 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
663 | { | |
664 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
665 | struct socket *sock = transport->sock; | |
666 | ||
667 | if (sock != NULL) | |
668 | kernel_sock_shutdown(sock, SHUT_WR); | |
669 | } | |
670 | ||
9903cd1c | 671 | /** |
262965f5 | 672 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
673 | * @task: address of RPC task that manages the state of an RPC request |
674 | * | |
675 | * Return values: | |
262965f5 CL |
676 | * 0: The request has been sent |
677 | * EAGAIN: The socket was blocked, please call again later to | |
678 | * complete the request | |
679 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 680 | * other: Some other error occurred, the request was not sent |
9903cd1c CL |
681 | * |
682 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 683 | * if sendmsg is not able to make progress? |
9903cd1c | 684 | */ |
262965f5 | 685 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
686 | { |
687 | struct rpc_rqst *req = task->tk_rqstp; | |
688 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 689 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 690 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 691 | int status; |
a246b010 | 692 | |
61677eee | 693 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
a246b010 | 694 | |
262965f5 CL |
695 | xs_pktdump("packet data:", |
696 | req->rq_svec->iov_base, | |
697 | req->rq_svec->iov_len); | |
a246b010 CL |
698 | |
699 | /* Continue transmitting the packet/record. We must be careful | |
700 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 701 | * called sendmsg(). */ |
a246b010 | 702 | while (1) { |
ee0ac0c2 CL |
703 | status = xs_sendpages(transport->sock, |
704 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 705 | |
46121cf7 | 706 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 707 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 708 | |
262965f5 | 709 | if (unlikely(status < 0)) |
a246b010 | 710 | break; |
a246b010 | 711 | |
262965f5 CL |
712 | /* If we've sent the entire packet, immediately |
713 | * reset the count of bytes sent. */ | |
714 | req->rq_bytes_sent += status; | |
d60dbb20 | 715 | req->rq_xmit_bytes_sent += status; |
262965f5 CL |
716 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
717 | req->rq_bytes_sent = 0; | |
718 | return 0; | |
719 | } | |
a246b010 | 720 | |
06b4b681 TM |
721 | if (status != 0) |
722 | continue; | |
a246b010 | 723 | status = -EAGAIN; |
06b4b681 | 724 | break; |
a246b010 CL |
725 | } |
726 | ||
262965f5 | 727 | switch (status) { |
fba91afb TM |
728 | case -ENOTSOCK: |
729 | status = -ENOTCONN; | |
730 | /* Should we call xs_close() here? */ | |
731 | break; | |
262965f5 | 732 | case -EAGAIN: |
5e3771ce | 733 | status = xs_nospace(task); |
262965f5 | 734 | break; |
c8485e4d TM |
735 | default: |
736 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
737 | -status); | |
262965f5 | 738 | case -ECONNRESET: |
2a9e1cfa TM |
739 | xs_tcp_shutdown(xprt); |
740 | case -ECONNREFUSED: | |
262965f5 | 741 | case -ENOTCONN: |
b9d2bb2e | 742 | case -EPIPE: |
b6ddf64f | 743 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 744 | } |
5fe46e9d | 745 | |
a246b010 CL |
746 | return status; |
747 | } | |
748 | ||
e0ab53de TM |
749 | /** |
750 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
751 | * @xprt: transport | |
752 | * @task: rpc task | |
753 | * | |
754 | * This cleans up if an error causes us to abort the transmission of a request. | |
755 | * In this case, the socket may need to be reset in order to avoid confusing | |
756 | * the server. | |
757 | */ | |
758 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
759 | { | |
760 | struct rpc_rqst *req; | |
761 | ||
762 | if (task != xprt->snd_task) | |
763 | return; | |
764 | if (task == NULL) | |
765 | goto out_release; | |
766 | req = task->tk_rqstp; | |
43cedbf0 TM |
767 | if (req == NULL) |
768 | goto out_release; | |
e0ab53de TM |
769 | if (req->rq_bytes_sent == 0) |
770 | goto out_release; | |
771 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
772 | goto out_release; | |
773 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
774 | out_release: | |
775 | xprt_release_xprt(xprt, task); | |
776 | } | |
777 | ||
2a9e1cfa TM |
778 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
779 | { | |
780 | transport->old_data_ready = sk->sk_data_ready; | |
781 | transport->old_state_change = sk->sk_state_change; | |
782 | transport->old_write_space = sk->sk_write_space; | |
2a9e1cfa TM |
783 | } |
784 | ||
785 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
786 | { | |
787 | sk->sk_data_ready = transport->old_data_ready; | |
788 | sk->sk_state_change = transport->old_state_change; | |
789 | sk->sk_write_space = transport->old_write_space; | |
2a9e1cfa TM |
790 | } |
791 | ||
fe315e76 | 792 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 793 | { |
ee0ac0c2 CL |
794 | struct socket *sock = transport->sock; |
795 | struct sock *sk = transport->inet; | |
a246b010 | 796 | |
fe315e76 CL |
797 | if (sk == NULL) |
798 | return; | |
9903cd1c | 799 | |
246408dc TM |
800 | transport->srcport = 0; |
801 | ||
a246b010 | 802 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
803 | transport->inet = NULL; |
804 | transport->sock = NULL; | |
a246b010 | 805 | |
9903cd1c | 806 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
807 | |
808 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
809 | write_unlock_bh(&sk->sk_callback_lock); |
810 | ||
9903cd1c | 811 | sk->sk_no_check = 0; |
a246b010 CL |
812 | |
813 | sock_release(sock); | |
fe315e76 CL |
814 | } |
815 | ||
816 | /** | |
817 | * xs_close - close a socket | |
818 | * @xprt: transport | |
819 | * | |
820 | * This is used when all requests are complete; ie, no DRC state remains | |
821 | * on the server we want to save. | |
f75e6745 TM |
822 | * |
823 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
824 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
825 | */ |
826 | static void xs_close(struct rpc_xprt *xprt) | |
827 | { | |
828 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
829 | ||
830 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
831 | ||
832 | xs_reset_transport(transport); | |
61d0a8e6 | 833 | xprt->reestablish_timeout = 0; |
fe315e76 | 834 | |
632e3bdc | 835 | smp_mb__before_clear_bit(); |
7d1e8255 | 836 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 837 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 838 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 839 | smp_mb__after_clear_bit(); |
62da3b24 | 840 | xprt_disconnect_done(xprt); |
a246b010 CL |
841 | } |
842 | ||
f75e6745 TM |
843 | static void xs_tcp_close(struct rpc_xprt *xprt) |
844 | { | |
845 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
846 | xs_close(xprt); | |
847 | else | |
848 | xs_tcp_shutdown(xprt); | |
849 | } | |
850 | ||
9903cd1c CL |
851 | /** |
852 | * xs_destroy - prepare to shutdown a transport | |
853 | * @xprt: doomed transport | |
854 | * | |
855 | */ | |
856 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 857 | { |
c8475461 CL |
858 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
859 | ||
46121cf7 | 860 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 861 | |
afe2c511 | 862 | cancel_delayed_work_sync(&transport->connect_worker); |
a246b010 | 863 | |
9903cd1c | 864 | xs_close(xprt); |
edb267a6 | 865 | xs_free_peer_addresses(xprt); |
e204e621 | 866 | xprt_free(xprt); |
bc25571e | 867 | module_put(THIS_MODULE); |
a246b010 CL |
868 | } |
869 | ||
9903cd1c CL |
870 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
871 | { | |
872 | return (struct rpc_xprt *) sk->sk_user_data; | |
873 | } | |
874 | ||
176e21ee CL |
875 | static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) |
876 | { | |
877 | struct xdr_skb_reader desc = { | |
878 | .skb = skb, | |
879 | .offset = sizeof(rpc_fraghdr), | |
880 | .count = skb->len - sizeof(rpc_fraghdr), | |
881 | }; | |
882 | ||
883 | if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) | |
884 | return -1; | |
885 | if (desc.count) | |
886 | return -1; | |
887 | return 0; | |
888 | } | |
889 | ||
890 | /** | |
891 | * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets | |
892 | * @sk: socket with data to read | |
893 | * @len: how much data to read | |
894 | * | |
895 | * Currently this assumes we can read the whole reply in a single gulp. | |
896 | */ | |
897 | static void xs_local_data_ready(struct sock *sk, int len) | |
898 | { | |
899 | struct rpc_task *task; | |
900 | struct rpc_xprt *xprt; | |
901 | struct rpc_rqst *rovr; | |
902 | struct sk_buff *skb; | |
903 | int err, repsize, copied; | |
904 | u32 _xid; | |
905 | __be32 *xp; | |
906 | ||
907 | read_lock_bh(&sk->sk_callback_lock); | |
908 | dprintk("RPC: %s...\n", __func__); | |
909 | xprt = xprt_from_sock(sk); | |
910 | if (xprt == NULL) | |
911 | goto out; | |
912 | ||
913 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
914 | if (skb == NULL) | |
915 | goto out; | |
916 | ||
176e21ee CL |
917 | repsize = skb->len - sizeof(rpc_fraghdr); |
918 | if (repsize < 4) { | |
919 | dprintk("RPC: impossible RPC reply size %d\n", repsize); | |
920 | goto dropit; | |
921 | } | |
922 | ||
923 | /* Copy the XID from the skb... */ | |
924 | xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); | |
925 | if (xp == NULL) | |
926 | goto dropit; | |
927 | ||
928 | /* Look up and lock the request corresponding to the given XID */ | |
929 | spin_lock(&xprt->transport_lock); | |
930 | rovr = xprt_lookup_rqst(xprt, *xp); | |
931 | if (!rovr) | |
932 | goto out_unlock; | |
933 | task = rovr->rq_task; | |
934 | ||
935 | copied = rovr->rq_private_buf.buflen; | |
936 | if (copied > repsize) | |
937 | copied = repsize; | |
938 | ||
939 | if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { | |
940 | dprintk("RPC: sk_buff copy failed\n"); | |
941 | goto out_unlock; | |
942 | } | |
943 | ||
944 | xprt_complete_rqst(task, copied); | |
945 | ||
946 | out_unlock: | |
947 | spin_unlock(&xprt->transport_lock); | |
948 | dropit: | |
949 | skb_free_datagram(sk, skb); | |
950 | out: | |
951 | read_unlock_bh(&sk->sk_callback_lock); | |
952 | } | |
953 | ||
9903cd1c CL |
954 | /** |
955 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
956 | * @sk: socket with data to read | |
957 | * @len: how much data to read | |
958 | * | |
a246b010 | 959 | */ |
9903cd1c | 960 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 961 | { |
9903cd1c CL |
962 | struct rpc_task *task; |
963 | struct rpc_xprt *xprt; | |
a246b010 | 964 | struct rpc_rqst *rovr; |
9903cd1c | 965 | struct sk_buff *skb; |
a246b010 | 966 | int err, repsize, copied; |
d8ed029d AD |
967 | u32 _xid; |
968 | __be32 *xp; | |
a246b010 | 969 | |
f064af1e | 970 | read_lock_bh(&sk->sk_callback_lock); |
46121cf7 | 971 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 972 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 973 | goto out; |
a246b010 CL |
974 | |
975 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
976 | goto out; | |
977 | ||
a246b010 CL |
978 | repsize = skb->len - sizeof(struct udphdr); |
979 | if (repsize < 4) { | |
46121cf7 | 980 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
981 | goto dropit; |
982 | } | |
983 | ||
984 | /* Copy the XID from the skb... */ | |
985 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
986 | sizeof(_xid), &_xid); | |
987 | if (xp == NULL) | |
988 | goto dropit; | |
989 | ||
990 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 991 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
992 | rovr = xprt_lookup_rqst(xprt, *xp); |
993 | if (!rovr) | |
994 | goto out_unlock; | |
995 | task = rovr->rq_task; | |
996 | ||
a246b010 CL |
997 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
998 | copied = repsize; | |
999 | ||
1000 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
1001 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
1002 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 1003 | goto out_unlock; |
1781f7f5 HX |
1004 | } |
1005 | ||
1006 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 | 1007 | |
1570c1e4 | 1008 | xprt_adjust_cwnd(task, copied); |
1570c1e4 | 1009 | xprt_complete_rqst(task, copied); |
a246b010 CL |
1010 | |
1011 | out_unlock: | |
4a0f8c04 | 1012 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
1013 | dropit: |
1014 | skb_free_datagram(sk, skb); | |
1015 | out: | |
f064af1e | 1016 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1017 | } |
1018 | ||
a519fc7a TM |
1019 | /* |
1020 | * Helper function to force a TCP close if the server is sending | |
1021 | * junk and/or it has put us in CLOSE_WAIT | |
1022 | */ | |
1023 | static void xs_tcp_force_close(struct rpc_xprt *xprt) | |
1024 | { | |
1025 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
1026 | xprt_force_disconnect(xprt); | |
1027 | } | |
1028 | ||
dd456471 | 1029 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 1030 | { |
51971139 | 1031 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
1032 | size_t len, used; |
1033 | char *p; | |
1034 | ||
51971139 CL |
1035 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
1036 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 1037 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1038 | transport->tcp_offset += used; |
a246b010 CL |
1039 | if (used != len) |
1040 | return; | |
808012fb | 1041 | |
51971139 CL |
1042 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
1043 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 1044 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 1045 | else |
e136d092 | 1046 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 1047 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 1048 | |
e136d092 | 1049 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 1050 | transport->tcp_offset = 0; |
808012fb | 1051 | |
a246b010 | 1052 | /* Sanity check of the record length */ |
18dca02a | 1053 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 1054 | dprintk("RPC: invalid TCP record fragment length\n"); |
a519fc7a | 1055 | xs_tcp_force_close(xprt); |
9903cd1c | 1056 | return; |
a246b010 | 1057 | } |
46121cf7 | 1058 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 1059 | transport->tcp_reclen); |
a246b010 CL |
1060 | } |
1061 | ||
51971139 | 1062 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 1063 | { |
51971139 | 1064 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 1065 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 1066 | transport->tcp_offset = 0; |
e136d092 CL |
1067 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
1068 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1069 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 1070 | transport->tcp_copied = 0; |
a246b010 CL |
1071 | } |
1072 | } | |
1073 | } | |
1074 | ||
dd456471 | 1075 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1076 | { |
1077 | size_t len, used; | |
1078 | char *p; | |
1079 | ||
51971139 | 1080 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 1081 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 1082 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 1083 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1084 | transport->tcp_offset += used; |
a246b010 CL |
1085 | if (used != len) |
1086 | return; | |
e136d092 | 1087 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 1088 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 1089 | transport->tcp_copied = 4; |
18dca02a RL |
1090 | dprintk("RPC: reading %s XID %08x\n", |
1091 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
1092 | : "request with", | |
51971139 CL |
1093 | ntohl(transport->tcp_xid)); |
1094 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
1095 | } |
1096 | ||
18dca02a RL |
1097 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1098 | struct xdr_skb_reader *desc) | |
a246b010 | 1099 | { |
18dca02a RL |
1100 | size_t len, used; |
1101 | u32 offset; | |
b76ce561 | 1102 | char *p; |
18dca02a RL |
1103 | |
1104 | /* | |
1105 | * We want transport->tcp_offset to be 8 at the end of this routine | |
1106 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
1107 | * When this function is called for the first time, | |
1108 | * transport->tcp_offset is 4 (after having already read the xid). | |
1109 | */ | |
1110 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
b76ce561 | 1111 | len = sizeof(transport->tcp_calldir) - offset; |
18dca02a | 1112 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
b76ce561 TM |
1113 | p = ((char *) &transport->tcp_calldir) + offset; |
1114 | used = xdr_skb_read_bits(desc, p, len); | |
18dca02a RL |
1115 | transport->tcp_offset += used; |
1116 | if (used != len) | |
1117 | return; | |
f4a2e418 | 1118 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
f4a2e418 RL |
1119 | /* |
1120 | * We don't yet have the XDR buffer, so we will write the calldir | |
1121 | * out after we get the buffer from the 'struct rpc_rqst' | |
1122 | */ | |
b76ce561 TM |
1123 | switch (ntohl(transport->tcp_calldir)) { |
1124 | case RPC_REPLY: | |
1125 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1126 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1127 | transport->tcp_flags |= TCP_RPC_REPLY; |
b76ce561 TM |
1128 | break; |
1129 | case RPC_CALL: | |
1130 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1131 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1132 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
b76ce561 TM |
1133 | break; |
1134 | default: | |
1135 | dprintk("RPC: invalid request message type\n"); | |
a519fc7a | 1136 | xs_tcp_force_close(&transport->xprt); |
b76ce561 | 1137 | } |
18dca02a RL |
1138 | xs_tcp_check_fraghdr(transport); |
1139 | } | |
1140 | ||
44b98efd RL |
1141 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1142 | struct xdr_skb_reader *desc, | |
1143 | struct rpc_rqst *req) | |
a246b010 | 1144 | { |
44b98efd RL |
1145 | struct sock_xprt *transport = |
1146 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1147 | struct xdr_buf *rcvbuf; |
1148 | size_t len; | |
1149 | ssize_t r; | |
1150 | ||
a246b010 | 1151 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1152 | |
1153 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1154 | /* | |
1155 | * Save the RPC direction in the XDR buffer | |
1156 | */ | |
f4a2e418 | 1157 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
b76ce561 TM |
1158 | &transport->tcp_calldir, |
1159 | sizeof(transport->tcp_calldir)); | |
1160 | transport->tcp_copied += sizeof(transport->tcp_calldir); | |
f4a2e418 | 1161 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
a246b010 CL |
1162 | } |
1163 | ||
a246b010 | 1164 | len = desc->count; |
51971139 | 1165 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1166 | struct xdr_skb_reader my_desc; |
a246b010 | 1167 | |
51971139 | 1168 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1169 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1170 | my_desc.count = len; | |
51971139 | 1171 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1172 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1173 | desc->count -= r; |
1174 | desc->offset += r; | |
1175 | } else | |
51971139 | 1176 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1177 | desc, xdr_skb_read_bits); |
a246b010 CL |
1178 | |
1179 | if (r > 0) { | |
51971139 CL |
1180 | transport->tcp_copied += r; |
1181 | transport->tcp_offset += r; | |
a246b010 CL |
1182 | } |
1183 | if (r != len) { | |
1184 | /* Error when copying to the receive buffer, | |
1185 | * usually because we weren't able to allocate | |
1186 | * additional buffer pages. All we can do now | |
e136d092 | 1187 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1188 | * will not receive any additional updates, |
1189 | * and time out. | |
1190 | * Any remaining data from this record will | |
1191 | * be discarded. | |
1192 | */ | |
e136d092 | 1193 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1194 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1195 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1196 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1197 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1198 | xprt, transport->tcp_copied, | |
1199 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1200 | return; |
a246b010 CL |
1201 | } |
1202 | ||
46121cf7 | 1203 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1204 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1205 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1206 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1207 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1208 | |
1209 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1210 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1211 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1212 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1213 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 | 1214 | } |
44b98efd RL |
1215 | } |
1216 | ||
1217 | /* | |
1218 | * Finds the request corresponding to the RPC xid and invokes the common | |
1219 | * tcp read code to read the data. | |
1220 | */ | |
1221 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1222 | struct xdr_skb_reader *desc) | |
1223 | { | |
1224 | struct sock_xprt *transport = | |
1225 | container_of(xprt, struct sock_xprt, xprt); | |
1226 | struct rpc_rqst *req; | |
1227 | ||
1228 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1229 | ||
1230 | /* Find and lock the request corresponding to this xid */ | |
1231 | spin_lock(&xprt->transport_lock); | |
1232 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1233 | if (!req) { | |
1234 | dprintk("RPC: XID %08x request not found!\n", | |
1235 | ntohl(transport->tcp_xid)); | |
1236 | spin_unlock(&xprt->transport_lock); | |
1237 | return -1; | |
1238 | } | |
1239 | ||
1240 | xs_tcp_read_common(xprt, desc, req); | |
1241 | ||
e136d092 | 1242 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1243 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1244 | |
4a0f8c04 | 1245 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1246 | return 0; |
1247 | } | |
1248 | ||
9e00abc3 | 1249 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
44b98efd RL |
1250 | /* |
1251 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1252 | * tcp read code to read the data. The result is placed in the callback | |
1253 | * queue. | |
1254 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1255 | * connection and return -1. | |
1256 | */ | |
1257 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1258 | struct xdr_skb_reader *desc) | |
1259 | { | |
1260 | struct sock_xprt *transport = | |
1261 | container_of(xprt, struct sock_xprt, xprt); | |
1262 | struct rpc_rqst *req; | |
1263 | ||
1264 | req = xprt_alloc_bc_request(xprt); | |
1265 | if (req == NULL) { | |
1266 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1267 | xprt_force_disconnect(xprt); | |
1268 | return -1; | |
1269 | } | |
1270 | ||
1271 | req->rq_xid = transport->tcp_xid; | |
1272 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1273 | xs_tcp_read_common(xprt, desc, req); | |
1274 | ||
1275 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1276 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1277 | ||
1278 | /* | |
1279 | * Add callback request to callback list. The callback | |
1280 | * service sleeps on the sv_cb_waitq waiting for new | |
1281 | * requests. Wake it up after adding enqueing the | |
1282 | * request. | |
1283 | */ | |
1284 | dprintk("RPC: add callback request to list\n"); | |
1285 | spin_lock(&bc_serv->sv_cb_lock); | |
1286 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1287 | spin_unlock(&bc_serv->sv_cb_lock); | |
1288 | wake_up(&bc_serv->sv_cb_waitq); | |
1289 | } | |
1290 | ||
1291 | req->rq_private_buf.len = transport->tcp_copied; | |
1292 | ||
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1297 | struct xdr_skb_reader *desc) | |
1298 | { | |
1299 | struct sock_xprt *transport = | |
1300 | container_of(xprt, struct sock_xprt, xprt); | |
1301 | ||
1302 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1303 | xs_tcp_read_reply(xprt, desc) : | |
1304 | xs_tcp_read_callback(xprt, desc); | |
1305 | } | |
1306 | #else | |
1307 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1308 | struct xdr_skb_reader *desc) | |
1309 | { | |
1310 | return xs_tcp_read_reply(xprt, desc); | |
1311 | } | |
9e00abc3 | 1312 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
44b98efd RL |
1313 | |
1314 | /* | |
1315 | * Read data off the transport. This can be either an RPC_CALL or an | |
1316 | * RPC_REPLY. Relay the processing to helper functions. | |
1317 | */ | |
1318 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1319 | struct xdr_skb_reader *desc) | |
1320 | { | |
1321 | struct sock_xprt *transport = | |
1322 | container_of(xprt, struct sock_xprt, xprt); | |
1323 | ||
1324 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1325 | xs_tcp_check_fraghdr(transport); | |
1326 | else { | |
1327 | /* | |
1328 | * The transport_lock protects the request handling. | |
1329 | * There's no need to hold it to update the tcp_flags. | |
1330 | */ | |
1331 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1332 | } | |
a246b010 CL |
1333 | } |
1334 | ||
dd456471 | 1335 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1336 | { |
1337 | size_t len; | |
1338 | ||
51971139 | 1339 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1340 | if (len > desc->count) |
1341 | len = desc->count; | |
1342 | desc->count -= len; | |
1343 | desc->offset += len; | |
51971139 | 1344 | transport->tcp_offset += len; |
46121cf7 | 1345 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1346 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1347 | } |
1348 | ||
9903cd1c | 1349 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1350 | { |
1351 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1352 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1353 | struct xdr_skb_reader desc = { |
a246b010 CL |
1354 | .skb = skb, |
1355 | .offset = offset, | |
1356 | .count = len, | |
9903cd1c | 1357 | }; |
a246b010 | 1358 | |
46121cf7 | 1359 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1360 | do { |
1361 | /* Read in a new fragment marker if necessary */ | |
1362 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1363 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1364 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1365 | continue; |
1366 | } | |
1367 | /* Read in the xid if necessary */ | |
e136d092 | 1368 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1369 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1370 | continue; |
1371 | } | |
18dca02a | 1372 | /* Read in the call/reply flag */ |
f4a2e418 | 1373 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1374 | xs_tcp_read_calldir(transport, &desc); |
1375 | continue; | |
1376 | } | |
a246b010 | 1377 | /* Read in the request data */ |
e136d092 | 1378 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1379 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1380 | continue; |
1381 | } | |
1382 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1383 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1384 | } while (desc.count); |
46121cf7 | 1385 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1386 | return len - desc.count; |
1387 | } | |
1388 | ||
9903cd1c CL |
1389 | /** |
1390 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1391 | * @sk: socket with data to read | |
1392 | * @bytes: how much data to read | |
1393 | * | |
1394 | */ | |
1395 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1396 | { |
1397 | struct rpc_xprt *xprt; | |
1398 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1399 | int read; |
a246b010 | 1400 | |
46121cf7 CL |
1401 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1402 | ||
f064af1e | 1403 | read_lock_bh(&sk->sk_callback_lock); |
9903cd1c | 1404 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1405 | goto out; |
61d0a8e6 NB |
1406 | /* Any data means we had a useful conversation, so |
1407 | * the we don't need to delay the next reconnect | |
1408 | */ | |
1409 | if (xprt->reestablish_timeout) | |
1410 | xprt->reestablish_timeout = 0; | |
1411 | ||
9903cd1c | 1412 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1413 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1414 | do { |
1415 | rd_desc.count = 65536; | |
1416 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1417 | } while (read > 0); | |
a246b010 | 1418 | out: |
f064af1e | 1419 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1420 | } |
1421 | ||
7d1e8255 TM |
1422 | /* |
1423 | * Do the equivalent of linger/linger2 handling for dealing with | |
1424 | * broken servers that don't close the socket in a timely | |
1425 | * fashion | |
1426 | */ | |
1427 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1428 | unsigned long timeout) | |
1429 | { | |
1430 | struct sock_xprt *transport; | |
1431 | ||
1432 | if (xprt_test_and_set_connecting(xprt)) | |
1433 | return; | |
1434 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1435 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1436 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1437 | timeout); | |
1438 | } | |
1439 | ||
1440 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1441 | { | |
1442 | struct sock_xprt *transport; | |
1443 | ||
1444 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1445 | ||
1446 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1447 | !cancel_delayed_work(&transport->connect_worker)) | |
1448 | return; | |
1449 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1450 | xprt_clear_connecting(xprt); | |
1451 | } | |
1452 | ||
4bc1e68e | 1453 | static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) |
7d1e8255 TM |
1454 | { |
1455 | smp_mb__before_clear_bit(); | |
a519fc7a TM |
1456 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1457 | clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
7d1e8255 TM |
1458 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1459 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1460 | smp_mb__after_clear_bit(); | |
4bc1e68e TM |
1461 | } |
1462 | ||
1463 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1464 | { | |
1465 | xs_sock_reset_connection_flags(xprt); | |
7d1e8255 TM |
1466 | /* Mark transport as closed and wake up all pending tasks */ |
1467 | xprt_disconnect_done(xprt); | |
1468 | } | |
1469 | ||
9903cd1c CL |
1470 | /** |
1471 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1472 | * @sk: socket whose state has changed | |
1473 | * | |
1474 | */ | |
1475 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1476 | { |
9903cd1c | 1477 | struct rpc_xprt *xprt; |
a246b010 | 1478 | |
f064af1e | 1479 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1480 | if (!(xprt = xprt_from_sock(sk))) |
1481 | goto out; | |
46121cf7 | 1482 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
669502ff | 1483 | dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
46121cf7 CL |
1484 | sk->sk_state, xprt_connected(xprt), |
1485 | sock_flag(sk, SOCK_DEAD), | |
669502ff AC |
1486 | sock_flag(sk, SOCK_ZAPPED), |
1487 | sk->sk_shutdown); | |
a246b010 CL |
1488 | |
1489 | switch (sk->sk_state) { | |
1490 | case TCP_ESTABLISHED: | |
f064af1e | 1491 | spin_lock(&xprt->transport_lock); |
a246b010 | 1492 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1493 | struct sock_xprt *transport = container_of(xprt, |
1494 | struct sock_xprt, xprt); | |
1495 | ||
a246b010 | 1496 | /* Reset TCP record info */ |
51971139 CL |
1497 | transport->tcp_offset = 0; |
1498 | transport->tcp_reclen = 0; | |
1499 | transport->tcp_copied = 0; | |
e136d092 CL |
1500 | transport->tcp_flags = |
1501 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1502 | |
2a491991 | 1503 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1504 | } |
f064af1e | 1505 | spin_unlock(&xprt->transport_lock); |
a246b010 | 1506 | break; |
3b948ae5 TM |
1507 | case TCP_FIN_WAIT1: |
1508 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1509 | xprt->connect_cookie++; |
663b8858 | 1510 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1511 | set_bit(XPRT_CLOSING, &xprt->state); |
1512 | smp_mb__before_clear_bit(); | |
1513 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1514 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1515 | smp_mb__after_clear_bit(); |
25fe6142 | 1516 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1517 | break; |
632e3bdc | 1518 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1519 | /* The server initiated a shutdown of the socket */ |
7c1d71cf | 1520 | xprt->connect_cookie++; |
d0bea455 | 1521 | clear_bit(XPRT_CONNECTED, &xprt->state); |
a519fc7a | 1522 | xs_tcp_force_close(xprt); |
663b8858 TM |
1523 | case TCP_CLOSING: |
1524 | /* | |
1525 | * If the server closed down the connection, make sure that | |
1526 | * we back off before reconnecting | |
1527 | */ | |
1528 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1529 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1530 | break; |
1531 | case TCP_LAST_ACK: | |
670f9457 | 1532 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1533 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1534 | smp_mb__before_clear_bit(); |
1535 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1536 | smp_mb__after_clear_bit(); | |
1537 | break; | |
1538 | case TCP_CLOSE: | |
7d1e8255 TM |
1539 | xs_tcp_cancel_linger_timeout(xprt); |
1540 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1541 | } |
1542 | out: | |
f064af1e | 1543 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1544 | } |
1545 | ||
1f0fa154 IJ |
1546 | static void xs_write_space(struct sock *sk) |
1547 | { | |
1548 | struct socket *sock; | |
1549 | struct rpc_xprt *xprt; | |
1550 | ||
1551 | if (unlikely(!(sock = sk->sk_socket))) | |
1552 | return; | |
1553 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1554 | ||
1555 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1556 | return; | |
1557 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1558 | return; | |
1559 | ||
1560 | xprt_write_space(xprt); | |
1561 | } | |
1562 | ||
9903cd1c | 1563 | /** |
c7b2cae8 CL |
1564 | * xs_udp_write_space - callback invoked when socket buffer space |
1565 | * becomes available | |
9903cd1c CL |
1566 | * @sk: socket whose state has changed |
1567 | * | |
a246b010 CL |
1568 | * Called when more output buffer space is available for this socket. |
1569 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1570 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1571 | * with a bunch of small requests. |
1572 | */ | |
c7b2cae8 | 1573 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1574 | { |
f064af1e | 1575 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1576 | |
c7b2cae8 | 1577 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1578 | if (sock_writeable(sk)) |
1579 | xs_write_space(sk); | |
a246b010 | 1580 | |
f064af1e | 1581 | read_unlock_bh(&sk->sk_callback_lock); |
c7b2cae8 | 1582 | } |
a246b010 | 1583 | |
c7b2cae8 CL |
1584 | /** |
1585 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1586 | * becomes available | |
1587 | * @sk: socket whose state has changed | |
1588 | * | |
1589 | * Called when more output buffer space is available for this socket. | |
1590 | * We try not to wake our writers until they can make "significant" | |
1591 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1592 | * with a bunch of small requests. | |
1593 | */ | |
1594 | static void xs_tcp_write_space(struct sock *sk) | |
1595 | { | |
f064af1e | 1596 | read_lock_bh(&sk->sk_callback_lock); |
c7b2cae8 CL |
1597 | |
1598 | /* from net/core/stream.c:sk_stream_write_space */ | |
1f0fa154 IJ |
1599 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
1600 | xs_write_space(sk); | |
b6ddf64f | 1601 | |
f064af1e | 1602 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1603 | } |
1604 | ||
470056c2 | 1605 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1606 | { |
ee0ac0c2 CL |
1607 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1608 | struct sock *sk = transport->inet; | |
a246b010 | 1609 | |
7c6e066e | 1610 | if (transport->rcvsize) { |
a246b010 | 1611 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1612 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1613 | } |
7c6e066e | 1614 | if (transport->sndsize) { |
a246b010 | 1615 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1616 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1617 | sk->sk_write_space(sk); |
1618 | } | |
1619 | } | |
1620 | ||
43118c29 | 1621 | /** |
470056c2 | 1622 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1623 | * @xprt: generic transport |
470056c2 CL |
1624 | * @sndsize: requested size of send buffer, in bytes |
1625 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1626 | * |
470056c2 | 1627 | * Set socket send and receive buffer size limits. |
43118c29 | 1628 | */ |
470056c2 | 1629 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1630 | { |
7c6e066e CL |
1631 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1632 | ||
1633 | transport->sndsize = 0; | |
470056c2 | 1634 | if (sndsize) |
7c6e066e CL |
1635 | transport->sndsize = sndsize + 1024; |
1636 | transport->rcvsize = 0; | |
470056c2 | 1637 | if (rcvsize) |
7c6e066e | 1638 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1639 | |
1640 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1641 | } |
1642 | ||
46c0ee8b CL |
1643 | /** |
1644 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1645 | * @task: task that timed out | |
1646 | * | |
1647 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1648 | */ | |
1649 | static void xs_udp_timer(struct rpc_task *task) | |
1650 | { | |
1651 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1652 | } | |
1653 | ||
b85d8806 CL |
1654 | static unsigned short xs_get_random_port(void) |
1655 | { | |
1656 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1657 | unsigned short rand = (unsigned short) net_random() % range; | |
1658 | return rand + xprt_min_resvport; | |
1659 | } | |
1660 | ||
92200412 CL |
1661 | /** |
1662 | * xs_set_port - reset the port number in the remote endpoint address | |
1663 | * @xprt: generic transport | |
1664 | * @port: new port number | |
1665 | * | |
1666 | */ | |
1667 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1668 | { | |
46121cf7 | 1669 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1670 | |
9dc3b095 CL |
1671 | rpc_set_port(xs_addr(xprt), port); |
1672 | xs_update_peer_port(xprt); | |
92200412 CL |
1673 | } |
1674 | ||
5d4ec932 | 1675 | static unsigned short xs_get_srcport(struct sock_xprt *transport) |
67a391d7 | 1676 | { |
fbfffbd5 | 1677 | unsigned short port = transport->srcport; |
67a391d7 TM |
1678 | |
1679 | if (port == 0 && transport->xprt.resvport) | |
1680 | port = xs_get_random_port(); | |
1681 | return port; | |
1682 | } | |
1683 | ||
baaf4e48 | 1684 | static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
67a391d7 | 1685 | { |
fbfffbd5 CL |
1686 | if (transport->srcport != 0) |
1687 | transport->srcport = 0; | |
67a391d7 TM |
1688 | if (!transport->xprt.resvport) |
1689 | return 0; | |
1690 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1691 | return xprt_max_resvport; | |
1692 | return --port; | |
1693 | } | |
beb59b68 | 1694 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
a246b010 | 1695 | { |
beb59b68 | 1696 | struct sockaddr_storage myaddr; |
67a391d7 | 1697 | int err, nloop = 0; |
5d4ec932 | 1698 | unsigned short port = xs_get_srcport(transport); |
67a391d7 | 1699 | unsigned short last; |
a246b010 | 1700 | |
beb59b68 | 1701 | memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
a246b010 | 1702 | do { |
beb59b68 PE |
1703 | rpc_set_port((struct sockaddr *)&myaddr, port); |
1704 | err = kernel_bind(sock, (struct sockaddr *)&myaddr, | |
1705 | transport->xprt.addrlen); | |
67a391d7 | 1706 | if (port == 0) |
d3bc9a1d | 1707 | break; |
a246b010 | 1708 | if (err == 0) { |
fbfffbd5 | 1709 | transport->srcport = port; |
d3bc9a1d | 1710 | break; |
a246b010 | 1711 | } |
67a391d7 | 1712 | last = port; |
baaf4e48 | 1713 | port = xs_next_srcport(transport, port); |
67a391d7 TM |
1714 | if (port > last) |
1715 | nloop++; | |
1716 | } while (err == -EADDRINUSE && nloop != 2); | |
90058d37 | 1717 | |
4232e863 | 1718 | if (myaddr.ss_family == AF_INET) |
beb59b68 PE |
1719 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
1720 | &((struct sockaddr_in *)&myaddr)->sin_addr, | |
1721 | port, err ? "failed" : "ok", err); | |
1722 | else | |
1723 | dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, | |
1724 | &((struct sockaddr_in6 *)&myaddr)->sin6_addr, | |
1725 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1726 | return err; |
1727 | } | |
1728 | ||
176e21ee CL |
1729 | /* |
1730 | * We don't support autobind on AF_LOCAL sockets | |
1731 | */ | |
1732 | static void xs_local_rpcbind(struct rpc_task *task) | |
1733 | { | |
1734 | xprt_set_bound(task->tk_xprt); | |
1735 | } | |
1736 | ||
1737 | static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1738 | { | |
1739 | } | |
beb59b68 | 1740 | |
ed07536e PZ |
1741 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1742 | static struct lock_class_key xs_key[2]; | |
1743 | static struct lock_class_key xs_slock_key[2]; | |
1744 | ||
176e21ee CL |
1745 | static inline void xs_reclassify_socketu(struct socket *sock) |
1746 | { | |
1747 | struct sock *sk = sock->sk; | |
1748 | ||
1749 | BUG_ON(sock_owned_by_user(sk)); | |
1750 | sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", | |
1751 | &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); | |
1752 | } | |
1753 | ||
8945ee5e | 1754 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1755 | { |
1756 | struct sock *sk = sock->sk; | |
8945ee5e | 1757 | |
02b3d346 | 1758 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1759 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1760 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1761 | } | |
ed07536e | 1762 | |
8945ee5e CL |
1763 | static inline void xs_reclassify_socket6(struct socket *sock) |
1764 | { | |
1765 | struct sock *sk = sock->sk; | |
ed07536e | 1766 | |
f4921aff | 1767 | BUG_ON(sock_owned_by_user(sk)); |
8945ee5e CL |
1768 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1769 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e | 1770 | } |
6bc9638a PE |
1771 | |
1772 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1773 | { | |
4232e863 | 1774 | switch (family) { |
176e21ee CL |
1775 | case AF_LOCAL: |
1776 | xs_reclassify_socketu(sock); | |
1777 | break; | |
4232e863 | 1778 | case AF_INET: |
6bc9638a | 1779 | xs_reclassify_socket4(sock); |
4232e863 CL |
1780 | break; |
1781 | case AF_INET6: | |
6bc9638a | 1782 | xs_reclassify_socket6(sock); |
4232e863 CL |
1783 | break; |
1784 | } | |
6bc9638a | 1785 | } |
ed07536e | 1786 | #else |
176e21ee CL |
1787 | static inline void xs_reclassify_socketu(struct socket *sock) |
1788 | { | |
1789 | } | |
1790 | ||
8945ee5e CL |
1791 | static inline void xs_reclassify_socket4(struct socket *sock) |
1792 | { | |
1793 | } | |
1794 | ||
1795 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1796 | { |
1797 | } | |
6bc9638a PE |
1798 | |
1799 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1800 | { | |
1801 | } | |
ed07536e PZ |
1802 | #endif |
1803 | ||
6bc9638a PE |
1804 | static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
1805 | struct sock_xprt *transport, int family, int type, int protocol) | |
22f79326 PE |
1806 | { |
1807 | struct socket *sock; | |
1808 | int err; | |
1809 | ||
6bc9638a | 1810 | err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
22f79326 PE |
1811 | if (err < 0) { |
1812 | dprintk("RPC: can't create %d transport socket (%d).\n", | |
1813 | protocol, -err); | |
1814 | goto out; | |
1815 | } | |
6bc9638a | 1816 | xs_reclassify_socket(family, sock); |
22f79326 | 1817 | |
4cea288a BH |
1818 | err = xs_bind(transport, sock); |
1819 | if (err) { | |
22f79326 PE |
1820 | sock_release(sock); |
1821 | goto out; | |
1822 | } | |
1823 | ||
1824 | return sock; | |
1825 | out: | |
1826 | return ERR_PTR(err); | |
1827 | } | |
1828 | ||
176e21ee CL |
1829 | static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
1830 | struct socket *sock) | |
1831 | { | |
1832 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1833 | xprt); | |
1834 | ||
1835 | if (!transport->inet) { | |
1836 | struct sock *sk = sock->sk; | |
1837 | ||
1838 | write_lock_bh(&sk->sk_callback_lock); | |
1839 | ||
1840 | xs_save_old_callbacks(transport, sk); | |
1841 | ||
1842 | sk->sk_user_data = xprt; | |
1843 | sk->sk_data_ready = xs_local_data_ready; | |
1844 | sk->sk_write_space = xs_udp_write_space; | |
176e21ee CL |
1845 | sk->sk_allocation = GFP_ATOMIC; |
1846 | ||
1847 | xprt_clear_connected(xprt); | |
1848 | ||
1849 | /* Reset to new socket */ | |
1850 | transport->sock = sock; | |
1851 | transport->inet = sk; | |
1852 | ||
1853 | write_unlock_bh(&sk->sk_callback_lock); | |
1854 | } | |
1855 | ||
1856 | /* Tell the socket layer to start connecting... */ | |
1857 | xprt->stat.connect_count++; | |
1858 | xprt->stat.connect_start = jiffies; | |
1859 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); | |
1860 | } | |
1861 | ||
1862 | /** | |
1863 | * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint | |
1864 | * @xprt: RPC transport to connect | |
1865 | * @transport: socket transport to connect | |
1866 | * @create_sock: function to create a socket of the correct type | |
1867 | * | |
1868 | * Invoked by a work queue tasklet. | |
1869 | */ | |
1870 | static void xs_local_setup_socket(struct work_struct *work) | |
1871 | { | |
1872 | struct sock_xprt *transport = | |
1873 | container_of(work, struct sock_xprt, connect_worker.work); | |
1874 | struct rpc_xprt *xprt = &transport->xprt; | |
1875 | struct socket *sock; | |
1876 | int status = -EIO; | |
1877 | ||
5cf02d09 JL |
1878 | current->flags |= PF_FSTRANS; |
1879 | ||
176e21ee CL |
1880 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1881 | status = __sock_create(xprt->xprt_net, AF_LOCAL, | |
1882 | SOCK_STREAM, 0, &sock, 1); | |
1883 | if (status < 0) { | |
1884 | dprintk("RPC: can't create AF_LOCAL " | |
1885 | "transport socket (%d).\n", -status); | |
1886 | goto out; | |
1887 | } | |
1888 | xs_reclassify_socketu(sock); | |
1889 | ||
1890 | dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", | |
1891 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1892 | ||
1893 | status = xs_local_finish_connecting(xprt, sock); | |
1894 | switch (status) { | |
1895 | case 0: | |
1896 | dprintk("RPC: xprt %p connected to %s\n", | |
1897 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1898 | xprt_set_connected(xprt); | |
1899 | break; | |
1900 | case -ENOENT: | |
1901 | dprintk("RPC: xprt %p: socket %s does not exist\n", | |
1902 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1903 | break; | |
1904 | default: | |
1905 | printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", | |
1906 | __func__, -status, | |
1907 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1908 | } | |
1909 | ||
1910 | out: | |
1911 | xprt_clear_connecting(xprt); | |
1912 | xprt_wake_pending_tasks(xprt, status); | |
5cf02d09 | 1913 | current->flags &= ~PF_FSTRANS; |
176e21ee CL |
1914 | } |
1915 | ||
a564b8f0 MG |
1916 | #ifdef CONFIG_SUNRPC_SWAP |
1917 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
1918 | { | |
1919 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1920 | xprt); | |
1921 | ||
1922 | if (xprt->swapper) | |
1923 | sk_set_memalloc(transport->inet); | |
1924 | } | |
1925 | ||
1926 | /** | |
1927 | * xs_swapper - Tag this transport as being used for swap. | |
1928 | * @xprt: transport to tag | |
1929 | * @enable: enable/disable | |
1930 | * | |
1931 | */ | |
1932 | int xs_swapper(struct rpc_xprt *xprt, int enable) | |
1933 | { | |
1934 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1935 | xprt); | |
1936 | int err = 0; | |
1937 | ||
1938 | if (enable) { | |
1939 | xprt->swapper++; | |
1940 | xs_set_memalloc(xprt); | |
1941 | } else if (xprt->swapper) { | |
1942 | xprt->swapper--; | |
1943 | sk_clear_memalloc(transport->inet); | |
1944 | } | |
1945 | ||
1946 | return err; | |
1947 | } | |
1948 | EXPORT_SYMBOL_GPL(xs_swapper); | |
1949 | #else | |
1950 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
1951 | { | |
1952 | } | |
1953 | #endif | |
1954 | ||
16be2d20 CL |
1955 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1956 | { | |
1957 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1958 | ||
1959 | if (!transport->inet) { | |
1960 | struct sock *sk = sock->sk; | |
1961 | ||
1962 | write_lock_bh(&sk->sk_callback_lock); | |
1963 | ||
2a9e1cfa TM |
1964 | xs_save_old_callbacks(transport, sk); |
1965 | ||
16be2d20 | 1966 | sk->sk_user_data = xprt; |
16be2d20 CL |
1967 | sk->sk_data_ready = xs_udp_data_ready; |
1968 | sk->sk_write_space = xs_udp_write_space; | |
1969 | sk->sk_no_check = UDP_CSUM_NORCV; | |
1970 | sk->sk_allocation = GFP_ATOMIC; | |
1971 | ||
1972 | xprt_set_connected(xprt); | |
1973 | ||
1974 | /* Reset to new socket */ | |
1975 | transport->sock = sock; | |
1976 | transport->inet = sk; | |
1977 | ||
a564b8f0 MG |
1978 | xs_set_memalloc(xprt); |
1979 | ||
16be2d20 CL |
1980 | write_unlock_bh(&sk->sk_callback_lock); |
1981 | } | |
1982 | xs_udp_do_set_buffer_size(xprt); | |
1983 | } | |
1984 | ||
8c14ff2a | 1985 | static void xs_udp_setup_socket(struct work_struct *work) |
a246b010 | 1986 | { |
34161db6 TM |
1987 | struct sock_xprt *transport = |
1988 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1989 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1990 | struct socket *sock = transport->sock; |
b65c0310 | 1991 | int status = -EIO; |
9903cd1c | 1992 | |
5cf02d09 JL |
1993 | current->flags |= PF_FSTRANS; |
1994 | ||
b0d93ad5 | 1995 | /* Start by resetting any existing state */ |
fe315e76 | 1996 | xs_reset_transport(transport); |
8c14ff2a PE |
1997 | sock = xs_create_sock(xprt, transport, |
1998 | xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); | |
b65c0310 | 1999 | if (IS_ERR(sock)) |
b0d93ad5 | 2000 | goto out; |
68e220bd | 2001 | |
c740eff8 CL |
2002 | dprintk("RPC: worker connecting xprt %p via %s to " |
2003 | "%s (port %s)\n", xprt, | |
2004 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2005 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2006 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
2007 | |
2008 | xs_udp_finish_connecting(xprt, sock); | |
b0d93ad5 CL |
2009 | status = 0; |
2010 | out: | |
b0d93ad5 | 2011 | xprt_clear_connecting(xprt); |
7d1e8255 | 2012 | xprt_wake_pending_tasks(xprt, status); |
5cf02d09 | 2013 | current->flags &= ~PF_FSTRANS; |
a246b010 CL |
2014 | } |
2015 | ||
3167e12c CL |
2016 | /* |
2017 | * We need to preserve the port number so the reply cache on the server can | |
2018 | * find our cached RPC replies when we get around to reconnecting. | |
2019 | */ | |
58dddac9 | 2020 | static void xs_abort_connection(struct sock_xprt *transport) |
3167e12c CL |
2021 | { |
2022 | int result; | |
3167e12c CL |
2023 | struct sockaddr any; |
2024 | ||
58dddac9 | 2025 | dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); |
3167e12c CL |
2026 | |
2027 | /* | |
2028 | * Disconnect the transport socket by doing a connect operation | |
2029 | * with AF_UNSPEC. This should return immediately... | |
2030 | */ | |
2031 | memset(&any, 0, sizeof(any)); | |
2032 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 2033 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
7d1e8255 | 2034 | if (!result) |
4bc1e68e TM |
2035 | xs_sock_reset_connection_flags(&transport->xprt); |
2036 | dprintk("RPC: AF_UNSPEC connect return code %d\n", result); | |
3167e12c CL |
2037 | } |
2038 | ||
58dddac9 | 2039 | static void xs_tcp_reuse_connection(struct sock_xprt *transport) |
40d2549d TM |
2040 | { |
2041 | unsigned int state = transport->inet->sk_state; | |
2042 | ||
669502ff AC |
2043 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { |
2044 | /* we don't need to abort the connection if the socket | |
2045 | * hasn't undergone a shutdown | |
2046 | */ | |
2047 | if (transport->inet->sk_shutdown == 0) | |
2048 | return; | |
2049 | dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", | |
2050 | __func__, transport->inet->sk_shutdown); | |
2051 | } | |
2052 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { | |
2053 | /* we don't need to abort the connection if the socket | |
2054 | * hasn't undergone a shutdown | |
2055 | */ | |
2056 | if (transport->inet->sk_shutdown == 0) | |
2057 | return; | |
2058 | dprintk("RPC: %s: ESTABLISHED/SYN_SENT " | |
2059 | "sk_shutdown set to %d\n", | |
2060 | __func__, transport->inet->sk_shutdown); | |
2061 | } | |
58dddac9 | 2062 | xs_abort_connection(transport); |
40d2549d TM |
2063 | } |
2064 | ||
16be2d20 | 2065 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 2066 | { |
16be2d20 | 2067 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
fe19a96b | 2068 | int ret = -ENOTCONN; |
edb267a6 | 2069 | |
ee0ac0c2 | 2070 | if (!transport->inet) { |
b0d93ad5 CL |
2071 | struct sock *sk = sock->sk; |
2072 | ||
2073 | write_lock_bh(&sk->sk_callback_lock); | |
2074 | ||
2a9e1cfa TM |
2075 | xs_save_old_callbacks(transport, sk); |
2076 | ||
b0d93ad5 | 2077 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
2078 | sk->sk_data_ready = xs_tcp_data_ready; |
2079 | sk->sk_state_change = xs_tcp_state_change; | |
2080 | sk->sk_write_space = xs_tcp_write_space; | |
b079fa7b | 2081 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
2082 | |
2083 | /* socket options */ | |
2084 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
2085 | sock_reset_flag(sk, SOCK_LINGER); | |
2086 | tcp_sk(sk)->linger2 = 0; | |
2087 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
2088 | |
2089 | xprt_clear_connected(xprt); | |
2090 | ||
2091 | /* Reset to new socket */ | |
ee0ac0c2 CL |
2092 | transport->sock = sock; |
2093 | transport->inet = sk; | |
b0d93ad5 CL |
2094 | |
2095 | write_unlock_bh(&sk->sk_callback_lock); | |
2096 | } | |
2097 | ||
01d37c42 | 2098 | if (!xprt_bound(xprt)) |
fe19a96b | 2099 | goto out; |
01d37c42 | 2100 | |
a564b8f0 MG |
2101 | xs_set_memalloc(xprt); |
2102 | ||
b0d93ad5 | 2103 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
2104 | xprt->stat.connect_count++; |
2105 | xprt->stat.connect_start = jiffies; | |
fe19a96b TM |
2106 | ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
2107 | switch (ret) { | |
2108 | case 0: | |
2109 | case -EINPROGRESS: | |
2110 | /* SYN_SENT! */ | |
2111 | xprt->connect_cookie++; | |
2112 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
2113 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2114 | } | |
2115 | out: | |
2116 | return ret; | |
16be2d20 CL |
2117 | } |
2118 | ||
9903cd1c | 2119 | /** |
b61d59ff TM |
2120 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
2121 | * @xprt: RPC transport to connect | |
2122 | * @transport: socket transport to connect | |
2123 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
2124 | * |
2125 | * Invoked by a work queue tasklet. | |
a246b010 | 2126 | */ |
cdd518d5 | 2127 | static void xs_tcp_setup_socket(struct work_struct *work) |
a246b010 | 2128 | { |
cdd518d5 PE |
2129 | struct sock_xprt *transport = |
2130 | container_of(work, struct sock_xprt, connect_worker.work); | |
ee0ac0c2 | 2131 | struct socket *sock = transport->sock; |
a9f5f0f7 | 2132 | struct rpc_xprt *xprt = &transport->xprt; |
b61d59ff | 2133 | int status = -EIO; |
a246b010 | 2134 | |
5cf02d09 JL |
2135 | current->flags |= PF_FSTRANS; |
2136 | ||
ee0ac0c2 | 2137 | if (!sock) { |
7d1e8255 | 2138 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
cdd518d5 PE |
2139 | sock = xs_create_sock(xprt, transport, |
2140 | xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); | |
b61d59ff TM |
2141 | if (IS_ERR(sock)) { |
2142 | status = PTR_ERR(sock); | |
3167e12c CL |
2143 | goto out; |
2144 | } | |
7d1e8255 TM |
2145 | } else { |
2146 | int abort_and_exit; | |
a246b010 | 2147 | |
7d1e8255 TM |
2148 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
2149 | &xprt->state); | |
3167e12c | 2150 | /* "close" the socket, preserving the local port */ |
58dddac9 | 2151 | xs_tcp_reuse_connection(transport); |
a246b010 | 2152 | |
7d1e8255 TM |
2153 | if (abort_and_exit) |
2154 | goto out_eagain; | |
2155 | } | |
a246b010 | 2156 | |
c740eff8 CL |
2157 | dprintk("RPC: worker connecting xprt %p via %s to " |
2158 | "%s (port %s)\n", xprt, | |
2159 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2160 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2161 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 2162 | |
16be2d20 | 2163 | status = xs_tcp_finish_connecting(xprt, sock); |
46121cf7 CL |
2164 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
2165 | xprt, -status, xprt_connected(xprt), | |
2166 | sock->sk->sk_state); | |
2a491991 | 2167 | switch (status) { |
f75e6745 TM |
2168 | default: |
2169 | printk("%s: connect returned unhandled error %d\n", | |
2170 | __func__, status); | |
2171 | case -EADDRNOTAVAIL: | |
2172 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
2173 | * and retry | |
2174 | */ | |
a519fc7a | 2175 | xs_tcp_force_close(xprt); |
88b5ed73 | 2176 | break; |
8a2cec29 TM |
2177 | case -ECONNREFUSED: |
2178 | case -ECONNRESET: | |
2179 | case -ENETUNREACH: | |
2180 | /* retry with existing socket, after a delay */ | |
2a491991 TM |
2181 | case 0: |
2182 | case -EINPROGRESS: | |
2183 | case -EALREADY: | |
7d1e8255 | 2184 | xprt_clear_connecting(xprt); |
5cf02d09 | 2185 | current->flags &= ~PF_FSTRANS; |
7d1e8255 | 2186 | return; |
9fcfe0c8 TM |
2187 | case -EINVAL: |
2188 | /* Happens, for instance, if the user specified a link | |
2189 | * local IPv6 address without a scope-id. | |
2190 | */ | |
2191 | goto out; | |
a246b010 | 2192 | } |
7d1e8255 | 2193 | out_eagain: |
2a491991 | 2194 | status = -EAGAIN; |
a246b010 | 2195 | out: |
68e220bd | 2196 | xprt_clear_connecting(xprt); |
7d1e8255 | 2197 | xprt_wake_pending_tasks(xprt, status); |
5cf02d09 | 2198 | current->flags &= ~PF_FSTRANS; |
68e220bd | 2199 | } |
b0d93ad5 | 2200 | |
9903cd1c CL |
2201 | /** |
2202 | * xs_connect - connect a socket to a remote endpoint | |
2203 | * @task: address of RPC task that manages state of connect request | |
2204 | * | |
2205 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2206 | * |
2207 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2208 | * to guarantee that even unprivileged user processes can set up a | |
2209 | * socket on a privileged port. | |
2210 | * | |
2211 | * If a UDP socket connect fails, the delay behavior here prevents | |
2212 | * retry floods (hard mounts). | |
9903cd1c CL |
2213 | */ |
2214 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
2215 | { |
2216 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 2217 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2218 | |
09a21c41 | 2219 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
46121cf7 CL |
2220 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2221 | "seconds\n", | |
03bf4b70 | 2222 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2223 | queue_delayed_work(rpciod_workqueue, |
2224 | &transport->connect_worker, | |
2225 | xprt->reestablish_timeout); | |
03bf4b70 | 2226 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2227 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2228 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2229 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2230 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2231 | } else { |
46121cf7 | 2232 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2233 | queue_delayed_work(rpciod_workqueue, |
2234 | &transport->connect_worker, 0); | |
a246b010 CL |
2235 | } |
2236 | } | |
2237 | ||
176e21ee CL |
2238 | /** |
2239 | * xs_local_print_stats - display AF_LOCAL socket-specifc stats | |
2240 | * @xprt: rpc_xprt struct containing statistics | |
2241 | * @seq: output file | |
2242 | * | |
2243 | */ | |
2244 | static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2245 | { | |
2246 | long idle_time = 0; | |
2247 | ||
2248 | if (xprt_connected(xprt)) | |
2249 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2250 | ||
2251 | seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " | |
15a45206 | 2252 | "%llu %llu %lu %llu %llu\n", |
176e21ee CL |
2253 | xprt->stat.bind_count, |
2254 | xprt->stat.connect_count, | |
2255 | xprt->stat.connect_time, | |
2256 | idle_time, | |
2257 | xprt->stat.sends, | |
2258 | xprt->stat.recvs, | |
2259 | xprt->stat.bad_xids, | |
2260 | xprt->stat.req_u, | |
15a45206 AA |
2261 | xprt->stat.bklog_u, |
2262 | xprt->stat.max_slots, | |
2263 | xprt->stat.sending_u, | |
2264 | xprt->stat.pending_u); | |
176e21ee CL |
2265 | } |
2266 | ||
262ca07d CL |
2267 | /** |
2268 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2269 | * @xprt: rpc_xprt struct containing statistics | |
2270 | * @seq: output file | |
2271 | * | |
2272 | */ | |
2273 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2274 | { | |
c8475461 CL |
2275 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2276 | ||
15a45206 AA |
2277 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " |
2278 | "%lu %llu %llu\n", | |
fbfffbd5 | 2279 | transport->srcport, |
262ca07d CL |
2280 | xprt->stat.bind_count, |
2281 | xprt->stat.sends, | |
2282 | xprt->stat.recvs, | |
2283 | xprt->stat.bad_xids, | |
2284 | xprt->stat.req_u, | |
15a45206 AA |
2285 | xprt->stat.bklog_u, |
2286 | xprt->stat.max_slots, | |
2287 | xprt->stat.sending_u, | |
2288 | xprt->stat.pending_u); | |
262ca07d CL |
2289 | } |
2290 | ||
2291 | /** | |
2292 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2293 | * @xprt: rpc_xprt struct containing statistics | |
2294 | * @seq: output file | |
2295 | * | |
2296 | */ | |
2297 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2298 | { | |
c8475461 | 2299 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2300 | long idle_time = 0; |
2301 | ||
2302 | if (xprt_connected(xprt)) | |
2303 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2304 | ||
15a45206 AA |
2305 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " |
2306 | "%llu %llu %lu %llu %llu\n", | |
fbfffbd5 | 2307 | transport->srcport, |
262ca07d CL |
2308 | xprt->stat.bind_count, |
2309 | xprt->stat.connect_count, | |
2310 | xprt->stat.connect_time, | |
2311 | idle_time, | |
2312 | xprt->stat.sends, | |
2313 | xprt->stat.recvs, | |
2314 | xprt->stat.bad_xids, | |
2315 | xprt->stat.req_u, | |
15a45206 AA |
2316 | xprt->stat.bklog_u, |
2317 | xprt->stat.max_slots, | |
2318 | xprt->stat.sending_u, | |
2319 | xprt->stat.pending_u); | |
262ca07d CL |
2320 | } |
2321 | ||
4cfc7e60 RI |
2322 | /* |
2323 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2324 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2325 | * to use the server side send routines. | |
2326 | */ | |
5a51f13a | 2327 | static void *bc_malloc(struct rpc_task *task, size_t size) |
4cfc7e60 RI |
2328 | { |
2329 | struct page *page; | |
2330 | struct rpc_buffer *buf; | |
2331 | ||
2332 | BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); | |
2333 | page = alloc_page(GFP_KERNEL); | |
2334 | ||
2335 | if (!page) | |
2336 | return NULL; | |
2337 | ||
2338 | buf = page_address(page); | |
2339 | buf->len = PAGE_SIZE; | |
2340 | ||
2341 | return buf->data; | |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * Free the space allocated in the bc_alloc routine | |
2346 | */ | |
5a51f13a | 2347 | static void bc_free(void *buffer) |
4cfc7e60 RI |
2348 | { |
2349 | struct rpc_buffer *buf; | |
2350 | ||
2351 | if (!buffer) | |
2352 | return; | |
2353 | ||
2354 | buf = container_of(buffer, struct rpc_buffer, data); | |
2355 | free_page((unsigned long)buf); | |
2356 | } | |
2357 | ||
2358 | /* | |
2359 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2360 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2361 | */ | |
2362 | static int bc_sendto(struct rpc_rqst *req) | |
2363 | { | |
2364 | int len; | |
2365 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2366 | struct rpc_xprt *xprt = req->rq_xprt; | |
2367 | struct sock_xprt *transport = | |
2368 | container_of(xprt, struct sock_xprt, xprt); | |
2369 | struct socket *sock = transport->sock; | |
2370 | unsigned long headoff; | |
2371 | unsigned long tailoff; | |
2372 | ||
61677eee | 2373 | xs_encode_stream_record_marker(xbufp); |
4cfc7e60 RI |
2374 | |
2375 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2376 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2377 | len = svc_send_common(sock, xbufp, | |
2378 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2379 | xbufp->tail[0].iov_base, tailoff); | |
2380 | ||
2381 | if (len != xbufp->len) { | |
2382 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2383 | len = -EAGAIN; | |
2384 | } | |
2385 | ||
2386 | return len; | |
2387 | } | |
2388 | ||
2389 | /* | |
2390 | * The send routine. Borrows from svc_send | |
2391 | */ | |
2392 | static int bc_send_request(struct rpc_task *task) | |
2393 | { | |
2394 | struct rpc_rqst *req = task->tk_rqstp; | |
2395 | struct svc_xprt *xprt; | |
2396 | struct svc_sock *svsk; | |
2397 | u32 len; | |
2398 | ||
2399 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2400 | /* | |
2401 | * Get the server socket associated with this callback xprt | |
2402 | */ | |
2403 | xprt = req->rq_xprt->bc_xprt; | |
2404 | svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
2405 | ||
2406 | /* | |
2407 | * Grab the mutex to serialize data as the connection is shared | |
2408 | * with the fore channel | |
2409 | */ | |
2410 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2411 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2412 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2413 | return -EAGAIN; | |
2414 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2415 | } | |
2416 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2417 | len = -ENOTCONN; | |
2418 | else | |
2419 | len = bc_sendto(req); | |
2420 | mutex_unlock(&xprt->xpt_mutex); | |
2421 | ||
2422 | if (len > 0) | |
2423 | len = 0; | |
2424 | ||
2425 | return len; | |
2426 | } | |
2427 | ||
2428 | /* | |
2429 | * The close routine. Since this is client initiated, we do nothing | |
2430 | */ | |
2431 | ||
2432 | static void bc_close(struct rpc_xprt *xprt) | |
2433 | { | |
4cfc7e60 RI |
2434 | } |
2435 | ||
2436 | /* | |
2437 | * The xprt destroy routine. Again, because this connection is client | |
2438 | * initiated, we do nothing | |
2439 | */ | |
2440 | ||
2441 | static void bc_destroy(struct rpc_xprt *xprt) | |
2442 | { | |
4cfc7e60 RI |
2443 | } |
2444 | ||
176e21ee CL |
2445 | static struct rpc_xprt_ops xs_local_ops = { |
2446 | .reserve_xprt = xprt_reserve_xprt, | |
2447 | .release_xprt = xs_tcp_release_xprt, | |
f39c1bfb | 2448 | .alloc_slot = xprt_alloc_slot, |
176e21ee CL |
2449 | .rpcbind = xs_local_rpcbind, |
2450 | .set_port = xs_local_set_port, | |
2451 | .connect = xs_connect, | |
2452 | .buf_alloc = rpc_malloc, | |
2453 | .buf_free = rpc_free, | |
2454 | .send_request = xs_local_send_request, | |
2455 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2456 | .close = xs_close, | |
2457 | .destroy = xs_destroy, | |
2458 | .print_stats = xs_local_print_stats, | |
2459 | }; | |
2460 | ||
262965f5 | 2461 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2462 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2463 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2464 | .release_xprt = xprt_release_xprt_cong, |
f39c1bfb | 2465 | .alloc_slot = xprt_alloc_slot, |
45160d62 | 2466 | .rpcbind = rpcb_getport_async, |
92200412 | 2467 | .set_port = xs_set_port, |
262965f5 | 2468 | .connect = xs_connect, |
02107148 CL |
2469 | .buf_alloc = rpc_malloc, |
2470 | .buf_free = rpc_free, | |
262965f5 | 2471 | .send_request = xs_udp_send_request, |
fe3aca29 | 2472 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2473 | .timer = xs_udp_timer, |
a58dd398 | 2474 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2475 | .close = xs_close, |
2476 | .destroy = xs_destroy, | |
262ca07d | 2477 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2478 | }; |
2479 | ||
2480 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2481 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2482 | .release_xprt = xs_tcp_release_xprt, |
f39c1bfb | 2483 | .alloc_slot = xprt_lock_and_alloc_slot, |
45160d62 | 2484 | .rpcbind = rpcb_getport_async, |
92200412 | 2485 | .set_port = xs_set_port, |
0b9e7943 | 2486 | .connect = xs_connect, |
02107148 CL |
2487 | .buf_alloc = rpc_malloc, |
2488 | .buf_free = rpc_free, | |
262965f5 | 2489 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2490 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
f75e6745 | 2491 | .close = xs_tcp_close, |
9903cd1c | 2492 | .destroy = xs_destroy, |
262ca07d | 2493 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2494 | }; |
2495 | ||
4cfc7e60 RI |
2496 | /* |
2497 | * The rpc_xprt_ops for the server backchannel | |
2498 | */ | |
2499 | ||
2500 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2501 | .reserve_xprt = xprt_reserve_xprt, | |
2502 | .release_xprt = xprt_release_xprt, | |
84e28a30 | 2503 | .alloc_slot = xprt_alloc_slot, |
92769108 | 2504 | .rpcbind = xs_local_rpcbind, |
4cfc7e60 RI |
2505 | .buf_alloc = bc_malloc, |
2506 | .buf_free = bc_free, | |
2507 | .send_request = bc_send_request, | |
2508 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2509 | .close = bc_close, | |
2510 | .destroy = bc_destroy, | |
2511 | .print_stats = xs_tcp_print_stats, | |
2512 | }; | |
2513 | ||
92476850 CL |
2514 | static int xs_init_anyaddr(const int family, struct sockaddr *sap) |
2515 | { | |
2516 | static const struct sockaddr_in sin = { | |
2517 | .sin_family = AF_INET, | |
2518 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
2519 | }; | |
2520 | static const struct sockaddr_in6 sin6 = { | |
2521 | .sin6_family = AF_INET6, | |
2522 | .sin6_addr = IN6ADDR_ANY_INIT, | |
2523 | }; | |
2524 | ||
2525 | switch (family) { | |
176e21ee CL |
2526 | case AF_LOCAL: |
2527 | break; | |
92476850 CL |
2528 | case AF_INET: |
2529 | memcpy(sap, &sin, sizeof(sin)); | |
2530 | break; | |
2531 | case AF_INET6: | |
2532 | memcpy(sap, &sin6, sizeof(sin6)); | |
2533 | break; | |
2534 | default: | |
2535 | dprintk("RPC: %s: Bad address family\n", __func__); | |
2536 | return -EAFNOSUPPORT; | |
2537 | } | |
2538 | return 0; | |
2539 | } | |
2540 | ||
3c341b0b | 2541 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
d9ba131d TM |
2542 | unsigned int slot_table_size, |
2543 | unsigned int max_slot_table_size) | |
c8541ecd CL |
2544 | { |
2545 | struct rpc_xprt *xprt; | |
ffc2e518 | 2546 | struct sock_xprt *new; |
c8541ecd | 2547 | |
96802a09 | 2548 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2549 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2550 | return ERR_PTR(-EBADF); |
2551 | } | |
2552 | ||
d9ba131d TM |
2553 | xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, |
2554 | max_slot_table_size); | |
bd1722d4 | 2555 | if (xprt == NULL) { |
46121cf7 CL |
2556 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2557 | "rpc_xprt\n"); | |
c8541ecd CL |
2558 | return ERR_PTR(-ENOMEM); |
2559 | } | |
c8541ecd | 2560 | |
bd1722d4 | 2561 | new = container_of(xprt, struct sock_xprt, xprt); |
96802a09 FM |
2562 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2563 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2564 | if (args->srcaddr) |
fbfffbd5 | 2565 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
92476850 CL |
2566 | else { |
2567 | int err; | |
2568 | err = xs_init_anyaddr(args->dstaddr->sa_family, | |
2569 | (struct sockaddr *)&new->srcaddr); | |
2aa13531 SK |
2570 | if (err != 0) { |
2571 | xprt_free(xprt); | |
92476850 | 2572 | return ERR_PTR(err); |
2aa13531 | 2573 | } |
92476850 | 2574 | } |
c8541ecd CL |
2575 | |
2576 | return xprt; | |
2577 | } | |
2578 | ||
176e21ee CL |
2579 | static const struct rpc_timeout xs_local_default_timeout = { |
2580 | .to_initval = 10 * HZ, | |
2581 | .to_maxval = 10 * HZ, | |
2582 | .to_retries = 2, | |
2583 | }; | |
2584 | ||
2585 | /** | |
2586 | * xs_setup_local - Set up transport to use an AF_LOCAL socket | |
2587 | * @args: rpc transport creation arguments | |
2588 | * | |
2589 | * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP | |
2590 | */ | |
2591 | static struct rpc_xprt *xs_setup_local(struct xprt_create *args) | |
2592 | { | |
2593 | struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; | |
2594 | struct sock_xprt *transport; | |
2595 | struct rpc_xprt *xprt; | |
2596 | struct rpc_xprt *ret; | |
2597 | ||
d9ba131d TM |
2598 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2599 | xprt_max_tcp_slot_table_entries); | |
176e21ee CL |
2600 | if (IS_ERR(xprt)) |
2601 | return xprt; | |
2602 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2603 | ||
2604 | xprt->prot = 0; | |
2605 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2606 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2607 | ||
2608 | xprt->bind_timeout = XS_BIND_TO; | |
2609 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2610 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
2611 | ||
2612 | xprt->ops = &xs_local_ops; | |
2613 | xprt->timeout = &xs_local_default_timeout; | |
2614 | ||
2615 | switch (sun->sun_family) { | |
2616 | case AF_LOCAL: | |
2617 | if (sun->sun_path[0] != '/') { | |
2618 | dprintk("RPC: bad AF_LOCAL address: %s\n", | |
2619 | sun->sun_path); | |
2620 | ret = ERR_PTR(-EINVAL); | |
2621 | goto out_err; | |
2622 | } | |
2623 | xprt_set_bound(xprt); | |
2624 | INIT_DELAYED_WORK(&transport->connect_worker, | |
2625 | xs_local_setup_socket); | |
2626 | xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); | |
2627 | break; | |
2628 | default: | |
2629 | ret = ERR_PTR(-EAFNOSUPPORT); | |
2630 | goto out_err; | |
2631 | } | |
2632 | ||
2633 | dprintk("RPC: set up xprt to %s via AF_LOCAL\n", | |
2634 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2635 | ||
2636 | if (try_module_get(THIS_MODULE)) | |
2637 | return xprt; | |
2638 | ret = ERR_PTR(-EINVAL); | |
2639 | out_err: | |
2640 | xprt_free(xprt); | |
2641 | return ret; | |
2642 | } | |
2643 | ||
2881ae74 TM |
2644 | static const struct rpc_timeout xs_udp_default_timeout = { |
2645 | .to_initval = 5 * HZ, | |
2646 | .to_maxval = 30 * HZ, | |
2647 | .to_increment = 5 * HZ, | |
2648 | .to_retries = 5, | |
2649 | }; | |
2650 | ||
9903cd1c CL |
2651 | /** |
2652 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2653 | * @args: rpc transport creation arguments |
9903cd1c CL |
2654 | * |
2655 | */ | |
483066d6 | 2656 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2657 | { |
8f9d5b1a | 2658 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2659 | struct rpc_xprt *xprt; |
c8475461 | 2660 | struct sock_xprt *transport; |
0a68b0be | 2661 | struct rpc_xprt *ret; |
a246b010 | 2662 | |
d9ba131d TM |
2663 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, |
2664 | xprt_udp_slot_table_entries); | |
c8541ecd CL |
2665 | if (IS_ERR(xprt)) |
2666 | return xprt; | |
c8475461 | 2667 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2668 | |
ec739ef0 | 2669 | xprt->prot = IPPROTO_UDP; |
808012fb | 2670 | xprt->tsh_size = 0; |
a246b010 CL |
2671 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2672 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2673 | ||
03bf4b70 | 2674 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2675 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2676 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2677 | |
262965f5 | 2678 | xprt->ops = &xs_udp_ops; |
a246b010 | 2679 | |
ba7392bb | 2680 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2681 | |
8f9d5b1a CL |
2682 | switch (addr->sa_family) { |
2683 | case AF_INET: | |
2684 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2685 | xprt_set_bound(xprt); | |
2686 | ||
2687 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2688 | xs_udp_setup_socket); |
9dc3b095 | 2689 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2690 | break; |
2691 | case AF_INET6: | |
2692 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2693 | xprt_set_bound(xprt); | |
2694 | ||
2695 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2696 | xs_udp_setup_socket); |
9dc3b095 | 2697 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2698 | break; |
2699 | default: | |
0a68b0be BF |
2700 | ret = ERR_PTR(-EAFNOSUPPORT); |
2701 | goto out_err; | |
8f9d5b1a CL |
2702 | } |
2703 | ||
c740eff8 CL |
2704 | if (xprt_bound(xprt)) |
2705 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2706 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2707 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2708 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2709 | else | |
2710 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2711 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2712 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2713 | |
bc25571e TT |
2714 | if (try_module_get(THIS_MODULE)) |
2715 | return xprt; | |
0a68b0be BF |
2716 | ret = ERR_PTR(-EINVAL); |
2717 | out_err: | |
e204e621 | 2718 | xprt_free(xprt); |
0a68b0be | 2719 | return ret; |
a246b010 CL |
2720 | } |
2721 | ||
2881ae74 TM |
2722 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2723 | .to_initval = 60 * HZ, | |
2724 | .to_maxval = 60 * HZ, | |
2725 | .to_retries = 2, | |
2726 | }; | |
2727 | ||
9903cd1c CL |
2728 | /** |
2729 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2730 | * @args: rpc transport creation arguments |
9903cd1c CL |
2731 | * |
2732 | */ | |
483066d6 | 2733 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2734 | { |
8f9d5b1a | 2735 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2736 | struct rpc_xprt *xprt; |
c8475461 | 2737 | struct sock_xprt *transport; |
0a68b0be | 2738 | struct rpc_xprt *ret; |
a246b010 | 2739 | |
d9ba131d TM |
2740 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2741 | xprt_max_tcp_slot_table_entries); | |
c8541ecd CL |
2742 | if (IS_ERR(xprt)) |
2743 | return xprt; | |
c8475461 | 2744 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2745 | |
ec739ef0 | 2746 | xprt->prot = IPPROTO_TCP; |
808012fb | 2747 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2748 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2749 | |
03bf4b70 | 2750 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2751 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2752 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2753 | |
262965f5 | 2754 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2755 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2756 | |
8f9d5b1a CL |
2757 | switch (addr->sa_family) { |
2758 | case AF_INET: | |
2759 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2760 | xprt_set_bound(xprt); | |
2761 | ||
9dc3b095 | 2762 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2763 | xs_tcp_setup_socket); |
9dc3b095 | 2764 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2765 | break; |
2766 | case AF_INET6: | |
2767 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2768 | xprt_set_bound(xprt); | |
2769 | ||
9dc3b095 | 2770 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2771 | xs_tcp_setup_socket); |
9dc3b095 | 2772 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2773 | break; |
2774 | default: | |
0a68b0be BF |
2775 | ret = ERR_PTR(-EAFNOSUPPORT); |
2776 | goto out_err; | |
8f9d5b1a CL |
2777 | } |
2778 | ||
c740eff8 CL |
2779 | if (xprt_bound(xprt)) |
2780 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2781 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2782 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2783 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2784 | else | |
2785 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2786 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2787 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2788 | ||
edb267a6 | 2789 | |
bc25571e TT |
2790 | if (try_module_get(THIS_MODULE)) |
2791 | return xprt; | |
0a68b0be BF |
2792 | ret = ERR_PTR(-EINVAL); |
2793 | out_err: | |
e204e621 | 2794 | xprt_free(xprt); |
0a68b0be | 2795 | return ret; |
a246b010 | 2796 | } |
282b32e1 | 2797 | |
f300baba AB |
2798 | /** |
2799 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2800 | * @args: rpc transport creation arguments | |
2801 | * | |
2802 | */ | |
2803 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2804 | { | |
2805 | struct sockaddr *addr = args->dstaddr; | |
2806 | struct rpc_xprt *xprt; | |
2807 | struct sock_xprt *transport; | |
2808 | struct svc_sock *bc_sock; | |
0a68b0be | 2809 | struct rpc_xprt *ret; |
f300baba | 2810 | |
f0418aa4 BF |
2811 | if (args->bc_xprt->xpt_bc_xprt) { |
2812 | /* | |
2813 | * This server connection already has a backchannel | |
2814 | * export; we can't create a new one, as we wouldn't be | |
2815 | * able to match replies based on xid any more. So, | |
2816 | * reuse the already-existing one: | |
2817 | */ | |
2818 | return args->bc_xprt->xpt_bc_xprt; | |
2819 | } | |
d9ba131d TM |
2820 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2821 | xprt_tcp_slot_table_entries); | |
f300baba AB |
2822 | if (IS_ERR(xprt)) |
2823 | return xprt; | |
2824 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2825 | ||
2826 | xprt->prot = IPPROTO_TCP; | |
2827 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2828 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2829 | xprt->timeout = &xs_tcp_default_timeout; | |
2830 | ||
2831 | /* backchannel */ | |
2832 | xprt_set_bound(xprt); | |
2833 | xprt->bind_timeout = 0; | |
f300baba AB |
2834 | xprt->reestablish_timeout = 0; |
2835 | xprt->idle_timeout = 0; | |
2836 | ||
f300baba AB |
2837 | xprt->ops = &bc_tcp_ops; |
2838 | ||
2839 | switch (addr->sa_family) { | |
2840 | case AF_INET: | |
2841 | xs_format_peer_addresses(xprt, "tcp", | |
2842 | RPCBIND_NETID_TCP); | |
2843 | break; | |
2844 | case AF_INET6: | |
2845 | xs_format_peer_addresses(xprt, "tcp", | |
2846 | RPCBIND_NETID_TCP6); | |
2847 | break; | |
2848 | default: | |
0a68b0be BF |
2849 | ret = ERR_PTR(-EAFNOSUPPORT); |
2850 | goto out_err; | |
f300baba AB |
2851 | } |
2852 | ||
50fa0d40 PE |
2853 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2854 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2855 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2856 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
f300baba | 2857 | |
99de8ea9 BF |
2858 | /* |
2859 | * Once we've associated a backchannel xprt with a connection, | |
2860 | * we want to keep it around as long as long as the connection | |
2861 | * lasts, in case we need to start using it for a backchannel | |
2862 | * again; this reference won't be dropped until bc_xprt is | |
2863 | * destroyed. | |
2864 | */ | |
2865 | xprt_get(xprt); | |
2866 | args->bc_xprt->xpt_bc_xprt = xprt; | |
2867 | xprt->bc_xprt = args->bc_xprt; | |
2868 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
2869 | transport->sock = bc_sock->sk_sock; | |
2870 | transport->inet = bc_sock->sk_sk; | |
2871 | ||
f300baba AB |
2872 | /* |
2873 | * Since we don't want connections for the backchannel, we set | |
2874 | * the xprt status to connected | |
2875 | */ | |
2876 | xprt_set_connected(xprt); | |
2877 | ||
2878 | ||
2879 | if (try_module_get(THIS_MODULE)) | |
2880 | return xprt; | |
99de8ea9 | 2881 | xprt_put(xprt); |
0a68b0be BF |
2882 | ret = ERR_PTR(-EINVAL); |
2883 | out_err: | |
e204e621 | 2884 | xprt_free(xprt); |
0a68b0be | 2885 | return ret; |
f300baba AB |
2886 | } |
2887 | ||
176e21ee CL |
2888 | static struct xprt_class xs_local_transport = { |
2889 | .list = LIST_HEAD_INIT(xs_local_transport.list), | |
2890 | .name = "named UNIX socket", | |
2891 | .owner = THIS_MODULE, | |
2892 | .ident = XPRT_TRANSPORT_LOCAL, | |
2893 | .setup = xs_setup_local, | |
2894 | }; | |
2895 | ||
bc25571e TT |
2896 | static struct xprt_class xs_udp_transport = { |
2897 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2898 | .name = "udp", | |
2899 | .owner = THIS_MODULE, | |
f300baba | 2900 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
2901 | .setup = xs_setup_udp, |
2902 | }; | |
2903 | ||
2904 | static struct xprt_class xs_tcp_transport = { | |
2905 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2906 | .name = "tcp", | |
2907 | .owner = THIS_MODULE, | |
f300baba | 2908 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
2909 | .setup = xs_setup_tcp, |
2910 | }; | |
2911 | ||
f300baba AB |
2912 | static struct xprt_class xs_bc_tcp_transport = { |
2913 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
2914 | .name = "tcp NFSv4.1 backchannel", | |
2915 | .owner = THIS_MODULE, | |
2916 | .ident = XPRT_TRANSPORT_BC_TCP, | |
2917 | .setup = xs_setup_bc_tcp, | |
2918 | }; | |
2919 | ||
282b32e1 | 2920 | /** |
bc25571e | 2921 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2922 | * |
2923 | */ | |
2924 | int init_socket_xprt(void) | |
2925 | { | |
fbf76683 | 2926 | #ifdef RPC_DEBUG |
2b1bec5f | 2927 | if (!sunrpc_table_header) |
0b4d4147 | 2928 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2929 | #endif |
2930 | ||
176e21ee | 2931 | xprt_register_transport(&xs_local_transport); |
bc25571e TT |
2932 | xprt_register_transport(&xs_udp_transport); |
2933 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 2934 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 2935 | |
282b32e1 CL |
2936 | return 0; |
2937 | } | |
2938 | ||
2939 | /** | |
bc25571e | 2940 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2941 | * |
2942 | */ | |
2943 | void cleanup_socket_xprt(void) | |
2944 | { | |
fbf76683 CL |
2945 | #ifdef RPC_DEBUG |
2946 | if (sunrpc_table_header) { | |
2947 | unregister_sysctl_table(sunrpc_table_header); | |
2948 | sunrpc_table_header = NULL; | |
2949 | } | |
2950 | #endif | |
bc25571e | 2951 | |
176e21ee | 2952 | xprt_unregister_transport(&xs_local_transport); |
bc25571e TT |
2953 | xprt_unregister_transport(&xs_udp_transport); |
2954 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 2955 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 2956 | } |
cbf11071 | 2957 | |
9bbb9e5a RR |
2958 | static int param_set_uint_minmax(const char *val, |
2959 | const struct kernel_param *kp, | |
cbf11071 TM |
2960 | unsigned int min, unsigned int max) |
2961 | { | |
2962 | unsigned long num; | |
2963 | int ret; | |
2964 | ||
2965 | if (!val) | |
2966 | return -EINVAL; | |
2967 | ret = strict_strtoul(val, 0, &num); | |
2968 | if (ret == -EINVAL || num < min || num > max) | |
2969 | return -EINVAL; | |
2970 | *((unsigned int *)kp->arg) = num; | |
2971 | return 0; | |
2972 | } | |
2973 | ||
9bbb9e5a | 2974 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
cbf11071 TM |
2975 | { |
2976 | return param_set_uint_minmax(val, kp, | |
2977 | RPC_MIN_RESVPORT, | |
2978 | RPC_MAX_RESVPORT); | |
2979 | } | |
2980 | ||
9bbb9e5a RR |
2981 | static struct kernel_param_ops param_ops_portnr = { |
2982 | .set = param_set_portnr, | |
2983 | .get = param_get_uint, | |
2984 | }; | |
2985 | ||
cbf11071 TM |
2986 | #define param_check_portnr(name, p) \ |
2987 | __param_check(name, p, unsigned int); | |
2988 | ||
2989 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
2990 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
2991 | ||
9bbb9e5a RR |
2992 | static int param_set_slot_table_size(const char *val, |
2993 | const struct kernel_param *kp) | |
cbf11071 TM |
2994 | { |
2995 | return param_set_uint_minmax(val, kp, | |
2996 | RPC_MIN_SLOT_TABLE, | |
2997 | RPC_MAX_SLOT_TABLE); | |
2998 | } | |
2999 | ||
9bbb9e5a RR |
3000 | static struct kernel_param_ops param_ops_slot_table_size = { |
3001 | .set = param_set_slot_table_size, | |
3002 | .get = param_get_uint, | |
3003 | }; | |
3004 | ||
cbf11071 TM |
3005 | #define param_check_slot_table_size(name, p) \ |
3006 | __param_check(name, p, unsigned int); | |
3007 | ||
d9ba131d TM |
3008 | static int param_set_max_slot_table_size(const char *val, |
3009 | const struct kernel_param *kp) | |
3010 | { | |
3011 | return param_set_uint_minmax(val, kp, | |
3012 | RPC_MIN_SLOT_TABLE, | |
3013 | RPC_MAX_SLOT_TABLE_LIMIT); | |
3014 | } | |
3015 | ||
3016 | static struct kernel_param_ops param_ops_max_slot_table_size = { | |
3017 | .set = param_set_max_slot_table_size, | |
3018 | .get = param_get_uint, | |
3019 | }; | |
3020 | ||
3021 | #define param_check_max_slot_table_size(name, p) \ | |
3022 | __param_check(name, p, unsigned int); | |
3023 | ||
cbf11071 TM |
3024 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
3025 | slot_table_size, 0644); | |
d9ba131d TM |
3026 | module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, |
3027 | max_slot_table_size, 0644); | |
cbf11071 TM |
3028 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
3029 | slot_table_size, 0644); | |
3030 |