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Commit | Line | Data |
---|---|---|
a246b010 CL |
1 | /* |
2 | * linux/net/sunrpc/xprtsock.c | |
3 | * | |
4 | * Client-side transport implementation for sockets. | |
5 | * | |
113aa838 AC |
6 | * TCP callback races fixes (C) 1998 Red Hat |
7 | * TCP send fixes (C) 1998 Red Hat | |
a246b010 CL |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> | |
10 | * | |
11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. | |
12 | * Fix behaviour when socket buffer is full. | |
13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
176e21ee | 22 | #include <linux/string.h> |
a246b010 | 23 | #include <linux/slab.h> |
bc25571e | 24 | #include <linux/module.h> |
a246b010 | 25 | #include <linux/capability.h> |
a246b010 CL |
26 | #include <linux/pagemap.h> |
27 | #include <linux/errno.h> | |
28 | #include <linux/socket.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/mm.h> | |
176e21ee | 32 | #include <linux/un.h> |
a246b010 CL |
33 | #include <linux/udp.h> |
34 | #include <linux/tcp.h> | |
35 | #include <linux/sunrpc/clnt.h> | |
5976687a | 36 | #include <linux/sunrpc/addr.h> |
02107148 | 37 | #include <linux/sunrpc/sched.h> |
4cfc7e60 | 38 | #include <linux/sunrpc/svcsock.h> |
49c36fcc | 39 | #include <linux/sunrpc/xprtsock.h> |
a246b010 | 40 | #include <linux/file.h> |
9e00abc3 | 41 | #ifdef CONFIG_SUNRPC_BACKCHANNEL |
44b98efd RL |
42 | #include <linux/sunrpc/bc_xprt.h> |
43 | #endif | |
a246b010 CL |
44 | |
45 | #include <net/sock.h> | |
46 | #include <net/checksum.h> | |
47 | #include <net/udp.h> | |
48 | #include <net/tcp.h> | |
49 | ||
40b5ea0c TM |
50 | #include <trace/events/sunrpc.h> |
51 | ||
4cfc7e60 | 52 | #include "sunrpc.h" |
176e21ee CL |
53 | |
54 | static void xs_close(struct rpc_xprt *xprt); | |
55 | ||
c556b754 CL |
56 | /* |
57 | * xprtsock tunables | |
58 | */ | |
09acfea5 TM |
59 | static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
60 | static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; | |
61 | static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; | |
c556b754 | 62 | |
09acfea5 TM |
63 | static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; |
64 | static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
c556b754 | 65 | |
7d1e8255 | 66 | #define XS_TCP_LINGER_TO (15U * HZ) |
25fe6142 | 67 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
7d1e8255 | 68 | |
fbf76683 CL |
69 | /* |
70 | * We can register our own files under /proc/sys/sunrpc by | |
71 | * calling register_sysctl_table() again. The files in that | |
72 | * directory become the union of all files registered there. | |
73 | * | |
74 | * We simply need to make sure that we don't collide with | |
75 | * someone else's file names! | |
76 | */ | |
77 | ||
78 | #ifdef RPC_DEBUG | |
79 | ||
80 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
81 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
d9ba131d | 82 | static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; |
fbf76683 CL |
83 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; |
84 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
85 | ||
86 | static struct ctl_table_header *sunrpc_table_header; | |
87 | ||
88 | /* | |
89 | * FIXME: changing the UDP slot table size should also resize the UDP | |
90 | * socket buffers for existing UDP transports | |
91 | */ | |
fe2c6338 | 92 | static struct ctl_table xs_tunables_table[] = { |
fbf76683 | 93 | { |
fbf76683 CL |
94 | .procname = "udp_slot_table_entries", |
95 | .data = &xprt_udp_slot_table_entries, | |
96 | .maxlen = sizeof(unsigned int), | |
97 | .mode = 0644, | |
6d456111 | 98 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
99 | .extra1 = &min_slot_table_size, |
100 | .extra2 = &max_slot_table_size | |
101 | }, | |
102 | { | |
fbf76683 CL |
103 | .procname = "tcp_slot_table_entries", |
104 | .data = &xprt_tcp_slot_table_entries, | |
105 | .maxlen = sizeof(unsigned int), | |
106 | .mode = 0644, | |
6d456111 | 107 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
108 | .extra1 = &min_slot_table_size, |
109 | .extra2 = &max_slot_table_size | |
110 | }, | |
d9ba131d TM |
111 | { |
112 | .procname = "tcp_max_slot_table_entries", | |
113 | .data = &xprt_max_tcp_slot_table_entries, | |
114 | .maxlen = sizeof(unsigned int), | |
115 | .mode = 0644, | |
116 | .proc_handler = proc_dointvec_minmax, | |
117 | .extra1 = &min_slot_table_size, | |
118 | .extra2 = &max_tcp_slot_table_limit | |
119 | }, | |
fbf76683 | 120 | { |
fbf76683 CL |
121 | .procname = "min_resvport", |
122 | .data = &xprt_min_resvport, | |
123 | .maxlen = sizeof(unsigned int), | |
124 | .mode = 0644, | |
6d456111 | 125 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
126 | .extra1 = &xprt_min_resvport_limit, |
127 | .extra2 = &xprt_max_resvport_limit | |
128 | }, | |
129 | { | |
fbf76683 CL |
130 | .procname = "max_resvport", |
131 | .data = &xprt_max_resvport, | |
132 | .maxlen = sizeof(unsigned int), | |
133 | .mode = 0644, | |
6d456111 | 134 | .proc_handler = proc_dointvec_minmax, |
fbf76683 CL |
135 | .extra1 = &xprt_min_resvport_limit, |
136 | .extra2 = &xprt_max_resvport_limit | |
137 | }, | |
25fe6142 TM |
138 | { |
139 | .procname = "tcp_fin_timeout", | |
140 | .data = &xs_tcp_fin_timeout, | |
141 | .maxlen = sizeof(xs_tcp_fin_timeout), | |
142 | .mode = 0644, | |
6d456111 | 143 | .proc_handler = proc_dointvec_jiffies, |
fbf76683 | 144 | }, |
f8572d8f | 145 | { }, |
fbf76683 CL |
146 | }; |
147 | ||
fe2c6338 | 148 | static struct ctl_table sunrpc_table[] = { |
fbf76683 | 149 | { |
fbf76683 CL |
150 | .procname = "sunrpc", |
151 | .mode = 0555, | |
152 | .child = xs_tunables_table | |
153 | }, | |
f8572d8f | 154 | { }, |
fbf76683 CL |
155 | }; |
156 | ||
157 | #endif | |
158 | ||
03bf4b70 CL |
159 | /* |
160 | * Wait duration for a reply from the RPC portmapper. | |
161 | */ | |
162 | #define XS_BIND_TO (60U * HZ) | |
163 | ||
164 | /* | |
165 | * Delay if a UDP socket connect error occurs. This is most likely some | |
166 | * kind of resource problem on the local host. | |
167 | */ | |
168 | #define XS_UDP_REEST_TO (2U * HZ) | |
169 | ||
170 | /* | |
171 | * The reestablish timeout allows clients to delay for a bit before attempting | |
172 | * to reconnect to a server that just dropped our connection. | |
173 | * | |
174 | * We implement an exponential backoff when trying to reestablish a TCP | |
175 | * transport connection with the server. Some servers like to drop a TCP | |
176 | * connection when they are overworked, so we start with a short timeout and | |
177 | * increase over time if the server is down or not responding. | |
178 | */ | |
179 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
180 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
181 | ||
182 | /* | |
183 | * TCP idle timeout; client drops the transport socket if it is idle | |
184 | * for this long. Note that we also timeout UDP sockets to prevent | |
185 | * holding port numbers when there is no RPC traffic. | |
186 | */ | |
187 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
188 | ||
a246b010 CL |
189 | #ifdef RPC_DEBUG |
190 | # undef RPC_DEBUG_DATA | |
9903cd1c | 191 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
192 | #endif |
193 | ||
a246b010 | 194 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 195 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 196 | { |
9903cd1c CL |
197 | u8 *buf = (u8 *) packet; |
198 | int j; | |
a246b010 | 199 | |
46121cf7 | 200 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
201 | for (j = 0; j < count && j < 128; j += 4) { |
202 | if (!(j & 31)) { | |
203 | if (j) | |
204 | dprintk("\n"); | |
205 | dprintk("0x%04x ", j); | |
206 | } | |
207 | dprintk("%02x%02x%02x%02x ", | |
208 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
209 | } | |
210 | dprintk("\n"); | |
211 | } | |
212 | #else | |
9903cd1c | 213 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
214 | { |
215 | /* NOP */ | |
216 | } | |
217 | #endif | |
218 | ||
ffc2e518 CL |
219 | struct sock_xprt { |
220 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
221 | |
222 | /* | |
223 | * Network layer | |
224 | */ | |
225 | struct socket * sock; | |
226 | struct sock * inet; | |
51971139 CL |
227 | |
228 | /* | |
229 | * State of TCP reply receive | |
230 | */ | |
231 | __be32 tcp_fraghdr, | |
b76ce561 TM |
232 | tcp_xid, |
233 | tcp_calldir; | |
51971139 CL |
234 | |
235 | u32 tcp_offset, | |
236 | tcp_reclen; | |
237 | ||
238 | unsigned long tcp_copied, | |
239 | tcp_flags; | |
c8475461 CL |
240 | |
241 | /* | |
242 | * Connection of transports | |
243 | */ | |
34161db6 | 244 | struct delayed_work connect_worker; |
fbfffbd5 CL |
245 | struct sockaddr_storage srcaddr; |
246 | unsigned short srcport; | |
7c6e066e CL |
247 | |
248 | /* | |
249 | * UDP socket buffer size parameters | |
250 | */ | |
251 | size_t rcvsize, | |
252 | sndsize; | |
314dfd79 CL |
253 | |
254 | /* | |
255 | * Saved socket callback addresses | |
256 | */ | |
257 | void (*old_data_ready)(struct sock *, int); | |
258 | void (*old_state_change)(struct sock *); | |
259 | void (*old_write_space)(struct sock *); | |
ffc2e518 CL |
260 | }; |
261 | ||
e136d092 CL |
262 | /* |
263 | * TCP receive state flags | |
264 | */ | |
265 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
266 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
267 | #define TCP_RCV_COPY_XID (1UL << 2) | |
268 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
269 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
270 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
271 | |
272 | /* | |
273 | * TCP RPC flags | |
274 | */ | |
f4a2e418 | 275 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 276 | |
95392c59 CL |
277 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
278 | { | |
279 | return (struct sockaddr *) &xprt->addr; | |
280 | } | |
281 | ||
176e21ee CL |
282 | static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) |
283 | { | |
284 | return (struct sockaddr_un *) &xprt->addr; | |
285 | } | |
286 | ||
95392c59 | 287 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
edb267a6 | 288 | { |
95392c59 CL |
289 | return (struct sockaddr_in *) &xprt->addr; |
290 | } | |
291 | ||
292 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
293 | { | |
294 | return (struct sockaddr_in6 *) &xprt->addr; | |
295 | } | |
296 | ||
c877b849 | 297 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 298 | { |
c877b849 | 299 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
300 | struct sockaddr_in6 *sin6; |
301 | struct sockaddr_in *sin; | |
176e21ee | 302 | struct sockaddr_un *sun; |
c877b849 | 303 | char buf[128]; |
edb267a6 | 304 | |
9dc3b095 | 305 | switch (sap->sa_family) { |
176e21ee CL |
306 | case AF_LOCAL: |
307 | sun = xs_addr_un(xprt); | |
308 | strlcpy(buf, sun->sun_path, sizeof(buf)); | |
309 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
310 | kstrdup(buf, GFP_KERNEL); | |
311 | break; | |
9dc3b095 | 312 | case AF_INET: |
176e21ee CL |
313 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
314 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
315 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 316 | sin = xs_addr_in(xprt); |
fc0b5791 | 317 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
9dc3b095 CL |
318 | break; |
319 | case AF_INET6: | |
176e21ee CL |
320 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
321 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
322 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 323 | sin6 = xs_addr_in6(xprt); |
fc0b5791 | 324 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
9dc3b095 CL |
325 | break; |
326 | default: | |
327 | BUG(); | |
756805e7 | 328 | } |
176e21ee | 329 | |
9dc3b095 | 330 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
331 | } |
332 | ||
9dc3b095 | 333 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 334 | { |
9dc3b095 CL |
335 | struct sockaddr *sap = xs_addr(xprt); |
336 | char buf[128]; | |
4b6473fb | 337 | |
81160e66 | 338 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 339 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
4b6473fb | 340 | |
81160e66 | 341 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 CL |
342 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
343 | } | |
4b6473fb | 344 | |
9dc3b095 CL |
345 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
346 | const char *protocol, | |
347 | const char *netid) | |
c877b849 | 348 | { |
b454ae90 | 349 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 350 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 351 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 352 | xs_format_common_peer_ports(xprt); |
edb267a6 | 353 | } |
4b6473fb | 354 | |
9dc3b095 | 355 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 356 | { |
9dc3b095 CL |
357 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
358 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 359 | |
9dc3b095 | 360 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
361 | } |
362 | ||
363 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
364 | { | |
33e01dc7 CL |
365 | unsigned int i; |
366 | ||
367 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
368 | switch (i) { | |
369 | case RPC_DISPLAY_PROTO: | |
370 | case RPC_DISPLAY_NETID: | |
371 | continue; | |
372 | default: | |
373 | kfree(xprt->address_strings[i]); | |
374 | } | |
edb267a6 CL |
375 | } |
376 | ||
b4b5cc85 CL |
377 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
378 | ||
24c5684b | 379 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 380 | { |
b4b5cc85 CL |
381 | struct msghdr msg = { |
382 | .msg_name = addr, | |
383 | .msg_namelen = addrlen, | |
24c5684b TM |
384 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
385 | }; | |
386 | struct kvec iov = { | |
387 | .iov_base = vec->iov_base + base, | |
388 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
389 | }; |
390 | ||
24c5684b | 391 | if (iov.iov_len != 0) |
b4b5cc85 CL |
392 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
393 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
394 | } | |
395 | ||
24c5684b | 396 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 397 | { |
24c5684b TM |
398 | struct page **ppage; |
399 | unsigned int remainder; | |
400 | int err, sent = 0; | |
401 | ||
402 | remainder = xdr->page_len - base; | |
403 | base += xdr->page_base; | |
404 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
405 | base &= ~PAGE_MASK; | |
406 | for(;;) { | |
407 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
408 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 409 | |
24c5684b TM |
410 | remainder -= len; |
411 | if (remainder != 0 || more) | |
412 | flags |= MSG_MORE; | |
413 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
414 | if (remainder == 0 || err != len) | |
415 | break; | |
416 | sent += err; | |
417 | ppage++; | |
418 | base = 0; | |
419 | } | |
420 | if (sent == 0) | |
421 | return err; | |
422 | if (err > 0) | |
423 | sent += err; | |
424 | return sent; | |
b4b5cc85 CL |
425 | } |
426 | ||
9903cd1c CL |
427 | /** |
428 | * xs_sendpages - write pages directly to a socket | |
429 | * @sock: socket to send on | |
430 | * @addr: UDP only -- address of destination | |
431 | * @addrlen: UDP only -- length of destination address | |
432 | * @xdr: buffer containing this request | |
433 | * @base: starting position in the buffer | |
434 | * | |
a246b010 | 435 | */ |
24c5684b | 436 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 437 | { |
24c5684b TM |
438 | unsigned int remainder = xdr->len - base; |
439 | int err, sent = 0; | |
a246b010 | 440 | |
262965f5 | 441 | if (unlikely(!sock)) |
fba91afb | 442 | return -ENOTSOCK; |
262965f5 CL |
443 | |
444 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
445 | if (base != 0) { |
446 | addr = NULL; | |
447 | addrlen = 0; | |
448 | } | |
262965f5 | 449 | |
24c5684b TM |
450 | if (base < xdr->head[0].iov_len || addr != NULL) { |
451 | unsigned int len = xdr->head[0].iov_len - base; | |
452 | remainder -= len; | |
453 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
454 | if (remainder == 0 || err != len) | |
a246b010 | 455 | goto out; |
24c5684b | 456 | sent += err; |
a246b010 CL |
457 | base = 0; |
458 | } else | |
24c5684b | 459 | base -= xdr->head[0].iov_len; |
a246b010 | 460 | |
24c5684b TM |
461 | if (base < xdr->page_len) { |
462 | unsigned int len = xdr->page_len - base; | |
463 | remainder -= len; | |
464 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
465 | if (remainder == 0 || err != len) | |
a246b010 | 466 | goto out; |
24c5684b | 467 | sent += err; |
a246b010 | 468 | base = 0; |
24c5684b TM |
469 | } else |
470 | base -= xdr->page_len; | |
471 | ||
472 | if (base >= xdr->tail[0].iov_len) | |
473 | return sent; | |
474 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 475 | out: |
24c5684b TM |
476 | if (sent == 0) |
477 | return err; | |
478 | if (err > 0) | |
479 | sent += err; | |
480 | return sent; | |
a246b010 CL |
481 | } |
482 | ||
b6ddf64f TM |
483 | static void xs_nospace_callback(struct rpc_task *task) |
484 | { | |
485 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
486 | ||
487 | transport->inet->sk_write_pending--; | |
488 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
489 | } | |
490 | ||
9903cd1c | 491 | /** |
262965f5 CL |
492 | * xs_nospace - place task on wait queue if transmit was incomplete |
493 | * @task: task to put to sleep | |
9903cd1c | 494 | * |
a246b010 | 495 | */ |
5e3771ce | 496 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 497 | { |
262965f5 CL |
498 | struct rpc_rqst *req = task->tk_rqstp; |
499 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 500 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
24ca9a84 | 501 | int ret = -EAGAIN; |
a246b010 | 502 | |
46121cf7 | 503 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
504 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
505 | req->rq_slen); | |
506 | ||
b6ddf64f TM |
507 | /* Protect against races with write_space */ |
508 | spin_lock_bh(&xprt->transport_lock); | |
509 | ||
510 | /* Don't race with disconnect */ | |
511 | if (xprt_connected(xprt)) { | |
512 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
513 | /* | |
514 | * Notify TCP that we're limited by the application | |
515 | * window size | |
516 | */ | |
517 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
518 | transport->inet->sk_write_pending++; | |
519 | /* ...and wait for more buffer space */ | |
520 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
521 | } | |
522 | } else { | |
523 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 524 | ret = -ENOTCONN; |
b6ddf64f | 525 | } |
262965f5 | 526 | |
b6ddf64f | 527 | spin_unlock_bh(&xprt->transport_lock); |
5e3771ce | 528 | return ret; |
262965f5 CL |
529 | } |
530 | ||
61677eee CL |
531 | /* |
532 | * Construct a stream transport record marker in @buf. | |
533 | */ | |
534 | static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) | |
535 | { | |
536 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
537 | rpc_fraghdr *base = buf->head[0].iov_base; | |
538 | *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); | |
539 | } | |
540 | ||
176e21ee CL |
541 | /** |
542 | * xs_local_send_request - write an RPC request to an AF_LOCAL socket | |
543 | * @task: RPC task that manages the state of an RPC request | |
544 | * | |
545 | * Return values: | |
546 | * 0: The request has been sent | |
547 | * EAGAIN: The socket was blocked, please call again later to | |
548 | * complete the request | |
549 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
550 | * other: Some other error occured, the request was not sent | |
551 | */ | |
552 | static int xs_local_send_request(struct rpc_task *task) | |
553 | { | |
554 | struct rpc_rqst *req = task->tk_rqstp; | |
555 | struct rpc_xprt *xprt = req->rq_xprt; | |
556 | struct sock_xprt *transport = | |
557 | container_of(xprt, struct sock_xprt, xprt); | |
558 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
559 | int status; | |
560 | ||
561 | xs_encode_stream_record_marker(&req->rq_snd_buf); | |
562 | ||
563 | xs_pktdump("packet data:", | |
564 | req->rq_svec->iov_base, req->rq_svec->iov_len); | |
565 | ||
566 | status = xs_sendpages(transport->sock, NULL, 0, | |
567 | xdr, req->rq_bytes_sent); | |
568 | dprintk("RPC: %s(%u) = %d\n", | |
569 | __func__, xdr->len - req->rq_bytes_sent, status); | |
570 | if (likely(status >= 0)) { | |
571 | req->rq_bytes_sent += status; | |
572 | req->rq_xmit_bytes_sent += status; | |
573 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { | |
574 | req->rq_bytes_sent = 0; | |
575 | return 0; | |
576 | } | |
577 | status = -EAGAIN; | |
578 | } | |
579 | ||
580 | switch (status) { | |
581 | case -EAGAIN: | |
582 | status = xs_nospace(task); | |
583 | break; | |
584 | default: | |
585 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
586 | -status); | |
587 | case -EPIPE: | |
588 | xs_close(xprt); | |
589 | status = -ENOTCONN; | |
590 | } | |
591 | ||
592 | return status; | |
593 | } | |
594 | ||
262965f5 CL |
595 | /** |
596 | * xs_udp_send_request - write an RPC request to a UDP socket | |
597 | * @task: address of RPC task that manages the state of an RPC request | |
598 | * | |
599 | * Return values: | |
600 | * 0: The request has been sent | |
601 | * EAGAIN: The socket was blocked, please call again later to | |
602 | * complete the request | |
603 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 604 | * other: Some other error occurred, the request was not sent |
262965f5 CL |
605 | */ |
606 | static int xs_udp_send_request(struct rpc_task *task) | |
607 | { | |
608 | struct rpc_rqst *req = task->tk_rqstp; | |
609 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 610 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
611 | struct xdr_buf *xdr = &req->rq_snd_buf; |
612 | int status; | |
a246b010 | 613 | |
9903cd1c | 614 | xs_pktdump("packet data:", |
a246b010 CL |
615 | req->rq_svec->iov_base, |
616 | req->rq_svec->iov_len); | |
617 | ||
01d37c42 TM |
618 | if (!xprt_bound(xprt)) |
619 | return -ENOTCONN; | |
ee0ac0c2 | 620 | status = xs_sendpages(transport->sock, |
95392c59 | 621 | xs_addr(xprt), |
ee0ac0c2 CL |
622 | xprt->addrlen, xdr, |
623 | req->rq_bytes_sent); | |
a246b010 | 624 | |
46121cf7 | 625 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 626 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 627 | |
2199700f | 628 | if (status >= 0) { |
d60dbb20 | 629 | req->rq_xmit_bytes_sent += status; |
2199700f TM |
630 | if (status >= req->rq_slen) |
631 | return 0; | |
632 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 633 | status = -EAGAIN; |
2199700f | 634 | } |
a246b010 | 635 | |
262965f5 | 636 | switch (status) { |
fba91afb TM |
637 | case -ENOTSOCK: |
638 | status = -ENOTCONN; | |
639 | /* Should we call xs_close() here? */ | |
640 | break; | |
b6ddf64f | 641 | case -EAGAIN: |
5e3771ce | 642 | status = xs_nospace(task); |
b6ddf64f | 643 | break; |
c8485e4d TM |
644 | default: |
645 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
646 | -status); | |
262965f5 CL |
647 | case -ENETUNREACH: |
648 | case -EPIPE: | |
a246b010 CL |
649 | case -ECONNREFUSED: |
650 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 651 | * prompts ECONNREFUSED. */ |
b6ddf64f | 652 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 653 | } |
5fe46e9d | 654 | |
262965f5 | 655 | return status; |
a246b010 CL |
656 | } |
657 | ||
e06799f9 TM |
658 | /** |
659 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
660 | * @xprt: transport | |
661 | * | |
662 | * Initiates a graceful shutdown of the TCP socket by calling the | |
663 | * equivalent of shutdown(SHUT_WR); | |
664 | */ | |
665 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
666 | { | |
667 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
668 | struct socket *sock = transport->sock; | |
669 | ||
40b5ea0c | 670 | if (sock != NULL) { |
e06799f9 | 671 | kernel_sock_shutdown(sock, SHUT_WR); |
40b5ea0c TM |
672 | trace_rpc_socket_shutdown(xprt, sock); |
673 | } | |
e06799f9 TM |
674 | } |
675 | ||
9903cd1c | 676 | /** |
262965f5 | 677 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
678 | * @task: address of RPC task that manages the state of an RPC request |
679 | * | |
680 | * Return values: | |
262965f5 CL |
681 | * 0: The request has been sent |
682 | * EAGAIN: The socket was blocked, please call again later to | |
683 | * complete the request | |
684 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 685 | * other: Some other error occurred, the request was not sent |
9903cd1c CL |
686 | * |
687 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 688 | * if sendmsg is not able to make progress? |
9903cd1c | 689 | */ |
262965f5 | 690 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
691 | { |
692 | struct rpc_rqst *req = task->tk_rqstp; | |
693 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 694 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 695 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 | 696 | int status; |
a246b010 | 697 | |
61677eee | 698 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
a246b010 | 699 | |
262965f5 CL |
700 | xs_pktdump("packet data:", |
701 | req->rq_svec->iov_base, | |
702 | req->rq_svec->iov_len); | |
a246b010 CL |
703 | |
704 | /* Continue transmitting the packet/record. We must be careful | |
705 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 706 | * called sendmsg(). */ |
a246b010 | 707 | while (1) { |
ee0ac0c2 CL |
708 | status = xs_sendpages(transport->sock, |
709 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 710 | |
46121cf7 | 711 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 712 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 713 | |
262965f5 | 714 | if (unlikely(status < 0)) |
a246b010 | 715 | break; |
a246b010 | 716 | |
262965f5 CL |
717 | /* If we've sent the entire packet, immediately |
718 | * reset the count of bytes sent. */ | |
719 | req->rq_bytes_sent += status; | |
d60dbb20 | 720 | req->rq_xmit_bytes_sent += status; |
262965f5 CL |
721 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
722 | req->rq_bytes_sent = 0; | |
723 | return 0; | |
724 | } | |
a246b010 | 725 | |
06b4b681 TM |
726 | if (status != 0) |
727 | continue; | |
a246b010 | 728 | status = -EAGAIN; |
06b4b681 | 729 | break; |
a246b010 CL |
730 | } |
731 | ||
262965f5 | 732 | switch (status) { |
fba91afb TM |
733 | case -ENOTSOCK: |
734 | status = -ENOTCONN; | |
735 | /* Should we call xs_close() here? */ | |
736 | break; | |
262965f5 | 737 | case -EAGAIN: |
5e3771ce | 738 | status = xs_nospace(task); |
262965f5 | 739 | break; |
c8485e4d TM |
740 | default: |
741 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
742 | -status); | |
262965f5 | 743 | case -ECONNRESET: |
2a9e1cfa TM |
744 | xs_tcp_shutdown(xprt); |
745 | case -ECONNREFUSED: | |
262965f5 | 746 | case -ENOTCONN: |
b9d2bb2e | 747 | case -EPIPE: |
b6ddf64f | 748 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 749 | } |
5fe46e9d | 750 | |
a246b010 CL |
751 | return status; |
752 | } | |
753 | ||
e0ab53de TM |
754 | /** |
755 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
756 | * @xprt: transport | |
757 | * @task: rpc task | |
758 | * | |
759 | * This cleans up if an error causes us to abort the transmission of a request. | |
760 | * In this case, the socket may need to be reset in order to avoid confusing | |
761 | * the server. | |
762 | */ | |
763 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
764 | { | |
765 | struct rpc_rqst *req; | |
766 | ||
767 | if (task != xprt->snd_task) | |
768 | return; | |
769 | if (task == NULL) | |
770 | goto out_release; | |
771 | req = task->tk_rqstp; | |
43cedbf0 TM |
772 | if (req == NULL) |
773 | goto out_release; | |
e0ab53de TM |
774 | if (req->rq_bytes_sent == 0) |
775 | goto out_release; | |
776 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
777 | goto out_release; | |
a4f0835c | 778 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
e0ab53de TM |
779 | out_release: |
780 | xprt_release_xprt(xprt, task); | |
781 | } | |
782 | ||
2a9e1cfa TM |
783 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
784 | { | |
785 | transport->old_data_ready = sk->sk_data_ready; | |
786 | transport->old_state_change = sk->sk_state_change; | |
787 | transport->old_write_space = sk->sk_write_space; | |
2a9e1cfa TM |
788 | } |
789 | ||
790 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
791 | { | |
792 | sk->sk_data_ready = transport->old_data_ready; | |
793 | sk->sk_state_change = transport->old_state_change; | |
794 | sk->sk_write_space = transport->old_write_space; | |
2a9e1cfa TM |
795 | } |
796 | ||
fe315e76 | 797 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 798 | { |
ee0ac0c2 CL |
799 | struct socket *sock = transport->sock; |
800 | struct sock *sk = transport->inet; | |
a246b010 | 801 | |
fe315e76 CL |
802 | if (sk == NULL) |
803 | return; | |
9903cd1c | 804 | |
246408dc TM |
805 | transport->srcport = 0; |
806 | ||
a246b010 | 807 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
808 | transport->inet = NULL; |
809 | transport->sock = NULL; | |
a246b010 | 810 | |
9903cd1c | 811 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
812 | |
813 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
814 | write_unlock_bh(&sk->sk_callback_lock); |
815 | ||
9903cd1c | 816 | sk->sk_no_check = 0; |
a246b010 | 817 | |
40b5ea0c | 818 | trace_rpc_socket_close(&transport->xprt, sock); |
a246b010 | 819 | sock_release(sock); |
fe315e76 CL |
820 | } |
821 | ||
822 | /** | |
823 | * xs_close - close a socket | |
824 | * @xprt: transport | |
825 | * | |
826 | * This is used when all requests are complete; ie, no DRC state remains | |
827 | * on the server we want to save. | |
f75e6745 TM |
828 | * |
829 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
830 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
831 | */ |
832 | static void xs_close(struct rpc_xprt *xprt) | |
833 | { | |
834 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
835 | ||
836 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
837 | ||
838 | xs_reset_transport(transport); | |
61d0a8e6 | 839 | xprt->reestablish_timeout = 0; |
fe315e76 | 840 | |
632e3bdc | 841 | smp_mb__before_clear_bit(); |
7d1e8255 | 842 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 843 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 844 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 845 | smp_mb__after_clear_bit(); |
62da3b24 | 846 | xprt_disconnect_done(xprt); |
a246b010 CL |
847 | } |
848 | ||
f75e6745 TM |
849 | static void xs_tcp_close(struct rpc_xprt *xprt) |
850 | { | |
851 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
852 | xs_close(xprt); | |
853 | else | |
854 | xs_tcp_shutdown(xprt); | |
855 | } | |
856 | ||
190b1ecf BF |
857 | static void xs_local_destroy(struct rpc_xprt *xprt) |
858 | { | |
859 | xs_close(xprt); | |
860 | xs_free_peer_addresses(xprt); | |
861 | xprt_free(xprt); | |
862 | module_put(THIS_MODULE); | |
863 | } | |
864 | ||
9903cd1c CL |
865 | /** |
866 | * xs_destroy - prepare to shutdown a transport | |
867 | * @xprt: doomed transport | |
868 | * | |
869 | */ | |
870 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 871 | { |
c8475461 CL |
872 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
873 | ||
46121cf7 | 874 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 875 | |
afe2c511 | 876 | cancel_delayed_work_sync(&transport->connect_worker); |
a246b010 | 877 | |
190b1ecf | 878 | xs_local_destroy(xprt); |
a246b010 CL |
879 | } |
880 | ||
9903cd1c CL |
881 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
882 | { | |
883 | return (struct rpc_xprt *) sk->sk_user_data; | |
884 | } | |
885 | ||
176e21ee CL |
886 | static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) |
887 | { | |
888 | struct xdr_skb_reader desc = { | |
889 | .skb = skb, | |
890 | .offset = sizeof(rpc_fraghdr), | |
891 | .count = skb->len - sizeof(rpc_fraghdr), | |
892 | }; | |
893 | ||
894 | if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) | |
895 | return -1; | |
896 | if (desc.count) | |
897 | return -1; | |
898 | return 0; | |
899 | } | |
900 | ||
901 | /** | |
902 | * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets | |
903 | * @sk: socket with data to read | |
904 | * @len: how much data to read | |
905 | * | |
906 | * Currently this assumes we can read the whole reply in a single gulp. | |
907 | */ | |
908 | static void xs_local_data_ready(struct sock *sk, int len) | |
909 | { | |
910 | struct rpc_task *task; | |
911 | struct rpc_xprt *xprt; | |
912 | struct rpc_rqst *rovr; | |
913 | struct sk_buff *skb; | |
914 | int err, repsize, copied; | |
915 | u32 _xid; | |
916 | __be32 *xp; | |
917 | ||
918 | read_lock_bh(&sk->sk_callback_lock); | |
919 | dprintk("RPC: %s...\n", __func__); | |
920 | xprt = xprt_from_sock(sk); | |
921 | if (xprt == NULL) | |
922 | goto out; | |
923 | ||
924 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
925 | if (skb == NULL) | |
926 | goto out; | |
927 | ||
176e21ee CL |
928 | repsize = skb->len - sizeof(rpc_fraghdr); |
929 | if (repsize < 4) { | |
930 | dprintk("RPC: impossible RPC reply size %d\n", repsize); | |
931 | goto dropit; | |
932 | } | |
933 | ||
934 | /* Copy the XID from the skb... */ | |
935 | xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); | |
936 | if (xp == NULL) | |
937 | goto dropit; | |
938 | ||
939 | /* Look up and lock the request corresponding to the given XID */ | |
940 | spin_lock(&xprt->transport_lock); | |
941 | rovr = xprt_lookup_rqst(xprt, *xp); | |
942 | if (!rovr) | |
943 | goto out_unlock; | |
944 | task = rovr->rq_task; | |
945 | ||
946 | copied = rovr->rq_private_buf.buflen; | |
947 | if (copied > repsize) | |
948 | copied = repsize; | |
949 | ||
950 | if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { | |
951 | dprintk("RPC: sk_buff copy failed\n"); | |
952 | goto out_unlock; | |
953 | } | |
954 | ||
955 | xprt_complete_rqst(task, copied); | |
956 | ||
957 | out_unlock: | |
958 | spin_unlock(&xprt->transport_lock); | |
959 | dropit: | |
960 | skb_free_datagram(sk, skb); | |
961 | out: | |
962 | read_unlock_bh(&sk->sk_callback_lock); | |
963 | } | |
964 | ||
9903cd1c CL |
965 | /** |
966 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
967 | * @sk: socket with data to read | |
968 | * @len: how much data to read | |
969 | * | |
a246b010 | 970 | */ |
9903cd1c | 971 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 972 | { |
9903cd1c CL |
973 | struct rpc_task *task; |
974 | struct rpc_xprt *xprt; | |
a246b010 | 975 | struct rpc_rqst *rovr; |
9903cd1c | 976 | struct sk_buff *skb; |
a246b010 | 977 | int err, repsize, copied; |
d8ed029d AD |
978 | u32 _xid; |
979 | __be32 *xp; | |
a246b010 | 980 | |
f064af1e | 981 | read_lock_bh(&sk->sk_callback_lock); |
46121cf7 | 982 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 983 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 984 | goto out; |
a246b010 CL |
985 | |
986 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
987 | goto out; | |
988 | ||
a246b010 CL |
989 | repsize = skb->len - sizeof(struct udphdr); |
990 | if (repsize < 4) { | |
46121cf7 | 991 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
992 | goto dropit; |
993 | } | |
994 | ||
995 | /* Copy the XID from the skb... */ | |
996 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
997 | sizeof(_xid), &_xid); | |
998 | if (xp == NULL) | |
999 | goto dropit; | |
1000 | ||
1001 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 1002 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
1003 | rovr = xprt_lookup_rqst(xprt, *xp); |
1004 | if (!rovr) | |
1005 | goto out_unlock; | |
1006 | task = rovr->rq_task; | |
1007 | ||
a246b010 CL |
1008 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
1009 | copied = repsize; | |
1010 | ||
1011 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
1012 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
1013 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 1014 | goto out_unlock; |
1781f7f5 HX |
1015 | } |
1016 | ||
1017 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 | 1018 | |
6a24dfb6 | 1019 | xprt_adjust_cwnd(xprt, task, copied); |
1570c1e4 | 1020 | xprt_complete_rqst(task, copied); |
a246b010 CL |
1021 | |
1022 | out_unlock: | |
4a0f8c04 | 1023 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
1024 | dropit: |
1025 | skb_free_datagram(sk, skb); | |
1026 | out: | |
f064af1e | 1027 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1028 | } |
1029 | ||
a519fc7a TM |
1030 | /* |
1031 | * Helper function to force a TCP close if the server is sending | |
1032 | * junk and/or it has put us in CLOSE_WAIT | |
1033 | */ | |
1034 | static void xs_tcp_force_close(struct rpc_xprt *xprt) | |
1035 | { | |
1036 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
1037 | xprt_force_disconnect(xprt); | |
1038 | } | |
1039 | ||
dd456471 | 1040 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 1041 | { |
51971139 | 1042 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
1043 | size_t len, used; |
1044 | char *p; | |
1045 | ||
51971139 CL |
1046 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
1047 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 1048 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1049 | transport->tcp_offset += used; |
a246b010 CL |
1050 | if (used != len) |
1051 | return; | |
808012fb | 1052 | |
51971139 CL |
1053 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
1054 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 1055 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 1056 | else |
e136d092 | 1057 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 1058 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 1059 | |
e136d092 | 1060 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 1061 | transport->tcp_offset = 0; |
808012fb | 1062 | |
a246b010 | 1063 | /* Sanity check of the record length */ |
18dca02a | 1064 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 1065 | dprintk("RPC: invalid TCP record fragment length\n"); |
a519fc7a | 1066 | xs_tcp_force_close(xprt); |
9903cd1c | 1067 | return; |
a246b010 | 1068 | } |
46121cf7 | 1069 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 1070 | transport->tcp_reclen); |
a246b010 CL |
1071 | } |
1072 | ||
51971139 | 1073 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 1074 | { |
51971139 | 1075 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 1076 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 1077 | transport->tcp_offset = 0; |
e136d092 CL |
1078 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
1079 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1080 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 1081 | transport->tcp_copied = 0; |
a246b010 CL |
1082 | } |
1083 | } | |
1084 | } | |
1085 | ||
dd456471 | 1086 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1087 | { |
1088 | size_t len, used; | |
1089 | char *p; | |
1090 | ||
51971139 | 1091 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 1092 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 1093 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 1094 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1095 | transport->tcp_offset += used; |
a246b010 CL |
1096 | if (used != len) |
1097 | return; | |
e136d092 | 1098 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 1099 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 1100 | transport->tcp_copied = 4; |
18dca02a RL |
1101 | dprintk("RPC: reading %s XID %08x\n", |
1102 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
1103 | : "request with", | |
51971139 CL |
1104 | ntohl(transport->tcp_xid)); |
1105 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
1106 | } |
1107 | ||
18dca02a RL |
1108 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1109 | struct xdr_skb_reader *desc) | |
a246b010 | 1110 | { |
18dca02a RL |
1111 | size_t len, used; |
1112 | u32 offset; | |
b76ce561 | 1113 | char *p; |
18dca02a RL |
1114 | |
1115 | /* | |
1116 | * We want transport->tcp_offset to be 8 at the end of this routine | |
1117 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
1118 | * When this function is called for the first time, | |
1119 | * transport->tcp_offset is 4 (after having already read the xid). | |
1120 | */ | |
1121 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
b76ce561 | 1122 | len = sizeof(transport->tcp_calldir) - offset; |
18dca02a | 1123 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
b76ce561 TM |
1124 | p = ((char *) &transport->tcp_calldir) + offset; |
1125 | used = xdr_skb_read_bits(desc, p, len); | |
18dca02a RL |
1126 | transport->tcp_offset += used; |
1127 | if (used != len) | |
1128 | return; | |
f4a2e418 | 1129 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
f4a2e418 RL |
1130 | /* |
1131 | * We don't yet have the XDR buffer, so we will write the calldir | |
1132 | * out after we get the buffer from the 'struct rpc_rqst' | |
1133 | */ | |
b76ce561 TM |
1134 | switch (ntohl(transport->tcp_calldir)) { |
1135 | case RPC_REPLY: | |
1136 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1137 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1138 | transport->tcp_flags |= TCP_RPC_REPLY; |
b76ce561 TM |
1139 | break; |
1140 | case RPC_CALL: | |
1141 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1142 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1143 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
b76ce561 TM |
1144 | break; |
1145 | default: | |
1146 | dprintk("RPC: invalid request message type\n"); | |
a519fc7a | 1147 | xs_tcp_force_close(&transport->xprt); |
b76ce561 | 1148 | } |
18dca02a RL |
1149 | xs_tcp_check_fraghdr(transport); |
1150 | } | |
1151 | ||
44b98efd RL |
1152 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1153 | struct xdr_skb_reader *desc, | |
1154 | struct rpc_rqst *req) | |
a246b010 | 1155 | { |
44b98efd RL |
1156 | struct sock_xprt *transport = |
1157 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1158 | struct xdr_buf *rcvbuf; |
1159 | size_t len; | |
1160 | ssize_t r; | |
1161 | ||
a246b010 | 1162 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1163 | |
1164 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1165 | /* | |
1166 | * Save the RPC direction in the XDR buffer | |
1167 | */ | |
f4a2e418 | 1168 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
b76ce561 TM |
1169 | &transport->tcp_calldir, |
1170 | sizeof(transport->tcp_calldir)); | |
1171 | transport->tcp_copied += sizeof(transport->tcp_calldir); | |
f4a2e418 | 1172 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
a246b010 CL |
1173 | } |
1174 | ||
a246b010 | 1175 | len = desc->count; |
51971139 | 1176 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1177 | struct xdr_skb_reader my_desc; |
a246b010 | 1178 | |
51971139 | 1179 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1180 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1181 | my_desc.count = len; | |
51971139 | 1182 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1183 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1184 | desc->count -= r; |
1185 | desc->offset += r; | |
1186 | } else | |
51971139 | 1187 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1188 | desc, xdr_skb_read_bits); |
a246b010 CL |
1189 | |
1190 | if (r > 0) { | |
51971139 CL |
1191 | transport->tcp_copied += r; |
1192 | transport->tcp_offset += r; | |
a246b010 CL |
1193 | } |
1194 | if (r != len) { | |
1195 | /* Error when copying to the receive buffer, | |
1196 | * usually because we weren't able to allocate | |
1197 | * additional buffer pages. All we can do now | |
e136d092 | 1198 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1199 | * will not receive any additional updates, |
1200 | * and time out. | |
1201 | * Any remaining data from this record will | |
1202 | * be discarded. | |
1203 | */ | |
e136d092 | 1204 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1205 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1206 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1207 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1208 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1209 | xprt, transport->tcp_copied, | |
1210 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1211 | return; |
a246b010 CL |
1212 | } |
1213 | ||
46121cf7 | 1214 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1215 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1216 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1217 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1218 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1219 | |
1220 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1221 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1222 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1223 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1224 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 | 1225 | } |
44b98efd RL |
1226 | } |
1227 | ||
1228 | /* | |
1229 | * Finds the request corresponding to the RPC xid and invokes the common | |
1230 | * tcp read code to read the data. | |
1231 | */ | |
1232 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1233 | struct xdr_skb_reader *desc) | |
1234 | { | |
1235 | struct sock_xprt *transport = | |
1236 | container_of(xprt, struct sock_xprt, xprt); | |
1237 | struct rpc_rqst *req; | |
1238 | ||
1239 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1240 | ||
1241 | /* Find and lock the request corresponding to this xid */ | |
1242 | spin_lock(&xprt->transport_lock); | |
1243 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1244 | if (!req) { | |
1245 | dprintk("RPC: XID %08x request not found!\n", | |
1246 | ntohl(transport->tcp_xid)); | |
1247 | spin_unlock(&xprt->transport_lock); | |
1248 | return -1; | |
1249 | } | |
1250 | ||
1251 | xs_tcp_read_common(xprt, desc, req); | |
1252 | ||
e136d092 | 1253 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1254 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1255 | |
4a0f8c04 | 1256 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1257 | return 0; |
1258 | } | |
1259 | ||
9e00abc3 | 1260 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
44b98efd RL |
1261 | /* |
1262 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1263 | * tcp read code to read the data. The result is placed in the callback | |
1264 | * queue. | |
1265 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1266 | * connection and return -1. | |
1267 | */ | |
1268 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1269 | struct xdr_skb_reader *desc) | |
1270 | { | |
1271 | struct sock_xprt *transport = | |
1272 | container_of(xprt, struct sock_xprt, xprt); | |
1273 | struct rpc_rqst *req; | |
1274 | ||
1275 | req = xprt_alloc_bc_request(xprt); | |
1276 | if (req == NULL) { | |
1277 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1278 | xprt_force_disconnect(xprt); | |
1279 | return -1; | |
1280 | } | |
1281 | ||
1282 | req->rq_xid = transport->tcp_xid; | |
1283 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1284 | xs_tcp_read_common(xprt, desc, req); | |
1285 | ||
1286 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1287 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1288 | ||
1289 | /* | |
1290 | * Add callback request to callback list. The callback | |
1291 | * service sleeps on the sv_cb_waitq waiting for new | |
1292 | * requests. Wake it up after adding enqueing the | |
1293 | * request. | |
1294 | */ | |
1295 | dprintk("RPC: add callback request to list\n"); | |
1296 | spin_lock(&bc_serv->sv_cb_lock); | |
1297 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1298 | spin_unlock(&bc_serv->sv_cb_lock); | |
1299 | wake_up(&bc_serv->sv_cb_waitq); | |
1300 | } | |
1301 | ||
1302 | req->rq_private_buf.len = transport->tcp_copied; | |
1303 | ||
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1308 | struct xdr_skb_reader *desc) | |
1309 | { | |
1310 | struct sock_xprt *transport = | |
1311 | container_of(xprt, struct sock_xprt, xprt); | |
1312 | ||
1313 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1314 | xs_tcp_read_reply(xprt, desc) : | |
1315 | xs_tcp_read_callback(xprt, desc); | |
1316 | } | |
1317 | #else | |
1318 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1319 | struct xdr_skb_reader *desc) | |
1320 | { | |
1321 | return xs_tcp_read_reply(xprt, desc); | |
1322 | } | |
9e00abc3 | 1323 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
44b98efd RL |
1324 | |
1325 | /* | |
1326 | * Read data off the transport. This can be either an RPC_CALL or an | |
1327 | * RPC_REPLY. Relay the processing to helper functions. | |
1328 | */ | |
1329 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1330 | struct xdr_skb_reader *desc) | |
1331 | { | |
1332 | struct sock_xprt *transport = | |
1333 | container_of(xprt, struct sock_xprt, xprt); | |
1334 | ||
1335 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1336 | xs_tcp_check_fraghdr(transport); | |
1337 | else { | |
1338 | /* | |
1339 | * The transport_lock protects the request handling. | |
1340 | * There's no need to hold it to update the tcp_flags. | |
1341 | */ | |
1342 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1343 | } | |
a246b010 CL |
1344 | } |
1345 | ||
dd456471 | 1346 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1347 | { |
1348 | size_t len; | |
1349 | ||
51971139 | 1350 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1351 | if (len > desc->count) |
1352 | len = desc->count; | |
1353 | desc->count -= len; | |
1354 | desc->offset += len; | |
51971139 | 1355 | transport->tcp_offset += len; |
46121cf7 | 1356 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1357 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1358 | } |
1359 | ||
9903cd1c | 1360 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1361 | { |
1362 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1363 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1364 | struct xdr_skb_reader desc = { |
a246b010 CL |
1365 | .skb = skb, |
1366 | .offset = offset, | |
1367 | .count = len, | |
9903cd1c | 1368 | }; |
a246b010 | 1369 | |
46121cf7 | 1370 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1371 | do { |
1372 | /* Read in a new fragment marker if necessary */ | |
1373 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1374 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1375 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1376 | continue; |
1377 | } | |
1378 | /* Read in the xid if necessary */ | |
e136d092 | 1379 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1380 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1381 | continue; |
1382 | } | |
18dca02a | 1383 | /* Read in the call/reply flag */ |
f4a2e418 | 1384 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1385 | xs_tcp_read_calldir(transport, &desc); |
1386 | continue; | |
1387 | } | |
a246b010 | 1388 | /* Read in the request data */ |
e136d092 | 1389 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1390 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1391 | continue; |
1392 | } | |
1393 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1394 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1395 | } while (desc.count); |
46121cf7 | 1396 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1397 | return len - desc.count; |
1398 | } | |
1399 | ||
9903cd1c CL |
1400 | /** |
1401 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1402 | * @sk: socket with data to read | |
1403 | * @bytes: how much data to read | |
1404 | * | |
1405 | */ | |
1406 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1407 | { |
1408 | struct rpc_xprt *xprt; | |
1409 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1410 | int read; |
a246b010 | 1411 | |
46121cf7 CL |
1412 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1413 | ||
f064af1e | 1414 | read_lock_bh(&sk->sk_callback_lock); |
9903cd1c | 1415 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1416 | goto out; |
61d0a8e6 NB |
1417 | /* Any data means we had a useful conversation, so |
1418 | * the we don't need to delay the next reconnect | |
1419 | */ | |
1420 | if (xprt->reestablish_timeout) | |
1421 | xprt->reestablish_timeout = 0; | |
1422 | ||
9903cd1c | 1423 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1424 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1425 | do { |
1426 | rd_desc.count = 65536; | |
1427 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1428 | } while (read > 0); | |
a246b010 | 1429 | out: |
f064af1e | 1430 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1431 | } |
1432 | ||
7d1e8255 TM |
1433 | /* |
1434 | * Do the equivalent of linger/linger2 handling for dealing with | |
1435 | * broken servers that don't close the socket in a timely | |
1436 | * fashion | |
1437 | */ | |
1438 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1439 | unsigned long timeout) | |
1440 | { | |
1441 | struct sock_xprt *transport; | |
1442 | ||
1443 | if (xprt_test_and_set_connecting(xprt)) | |
1444 | return; | |
1445 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1446 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1447 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1448 | timeout); | |
1449 | } | |
1450 | ||
1451 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1452 | { | |
1453 | struct sock_xprt *transport; | |
1454 | ||
1455 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1456 | ||
1457 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1458 | !cancel_delayed_work(&transport->connect_worker)) | |
1459 | return; | |
1460 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1461 | xprt_clear_connecting(xprt); | |
1462 | } | |
1463 | ||
4bc1e68e | 1464 | static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) |
7d1e8255 TM |
1465 | { |
1466 | smp_mb__before_clear_bit(); | |
a519fc7a TM |
1467 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1468 | clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
7d1e8255 TM |
1469 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1470 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1471 | smp_mb__after_clear_bit(); | |
4bc1e68e TM |
1472 | } |
1473 | ||
1474 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1475 | { | |
1476 | xs_sock_reset_connection_flags(xprt); | |
7d1e8255 TM |
1477 | /* Mark transport as closed and wake up all pending tasks */ |
1478 | xprt_disconnect_done(xprt); | |
1479 | } | |
1480 | ||
9903cd1c CL |
1481 | /** |
1482 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1483 | * @sk: socket whose state has changed | |
1484 | * | |
1485 | */ | |
1486 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1487 | { |
9903cd1c | 1488 | struct rpc_xprt *xprt; |
a246b010 | 1489 | |
f064af1e | 1490 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1491 | if (!(xprt = xprt_from_sock(sk))) |
1492 | goto out; | |
46121cf7 | 1493 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
669502ff | 1494 | dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
46121cf7 CL |
1495 | sk->sk_state, xprt_connected(xprt), |
1496 | sock_flag(sk, SOCK_DEAD), | |
669502ff AC |
1497 | sock_flag(sk, SOCK_ZAPPED), |
1498 | sk->sk_shutdown); | |
a246b010 | 1499 | |
40b5ea0c | 1500 | trace_rpc_socket_state_change(xprt, sk->sk_socket); |
a246b010 CL |
1501 | switch (sk->sk_state) { |
1502 | case TCP_ESTABLISHED: | |
f064af1e | 1503 | spin_lock(&xprt->transport_lock); |
a246b010 | 1504 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1505 | struct sock_xprt *transport = container_of(xprt, |
1506 | struct sock_xprt, xprt); | |
1507 | ||
a246b010 | 1508 | /* Reset TCP record info */ |
51971139 CL |
1509 | transport->tcp_offset = 0; |
1510 | transport->tcp_reclen = 0; | |
1511 | transport->tcp_copied = 0; | |
e136d092 CL |
1512 | transport->tcp_flags = |
1513 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1514 | |
2a491991 | 1515 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1516 | } |
f064af1e | 1517 | spin_unlock(&xprt->transport_lock); |
a246b010 | 1518 | break; |
3b948ae5 TM |
1519 | case TCP_FIN_WAIT1: |
1520 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1521 | xprt->connect_cookie++; |
663b8858 | 1522 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1523 | set_bit(XPRT_CLOSING, &xprt->state); |
1524 | smp_mb__before_clear_bit(); | |
1525 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1526 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1527 | smp_mb__after_clear_bit(); |
25fe6142 | 1528 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1529 | break; |
632e3bdc | 1530 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1531 | /* The server initiated a shutdown of the socket */ |
7c1d71cf | 1532 | xprt->connect_cookie++; |
d0bea455 | 1533 | clear_bit(XPRT_CONNECTED, &xprt->state); |
a519fc7a | 1534 | xs_tcp_force_close(xprt); |
663b8858 TM |
1535 | case TCP_CLOSING: |
1536 | /* | |
1537 | * If the server closed down the connection, make sure that | |
1538 | * we back off before reconnecting | |
1539 | */ | |
1540 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1541 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1542 | break; |
1543 | case TCP_LAST_ACK: | |
670f9457 | 1544 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1545 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1546 | smp_mb__before_clear_bit(); |
1547 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1548 | smp_mb__after_clear_bit(); | |
1549 | break; | |
1550 | case TCP_CLOSE: | |
7d1e8255 TM |
1551 | xs_tcp_cancel_linger_timeout(xprt); |
1552 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1553 | } |
1554 | out: | |
f064af1e | 1555 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1556 | } |
1557 | ||
1f0fa154 IJ |
1558 | static void xs_write_space(struct sock *sk) |
1559 | { | |
1560 | struct socket *sock; | |
1561 | struct rpc_xprt *xprt; | |
1562 | ||
1563 | if (unlikely(!(sock = sk->sk_socket))) | |
1564 | return; | |
1565 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1566 | ||
1567 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1568 | return; | |
1569 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1570 | return; | |
1571 | ||
1572 | xprt_write_space(xprt); | |
1573 | } | |
1574 | ||
9903cd1c | 1575 | /** |
c7b2cae8 CL |
1576 | * xs_udp_write_space - callback invoked when socket buffer space |
1577 | * becomes available | |
9903cd1c CL |
1578 | * @sk: socket whose state has changed |
1579 | * | |
a246b010 CL |
1580 | * Called when more output buffer space is available for this socket. |
1581 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1582 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1583 | * with a bunch of small requests. |
1584 | */ | |
c7b2cae8 | 1585 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1586 | { |
f064af1e | 1587 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1588 | |
c7b2cae8 | 1589 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1590 | if (sock_writeable(sk)) |
1591 | xs_write_space(sk); | |
a246b010 | 1592 | |
f064af1e | 1593 | read_unlock_bh(&sk->sk_callback_lock); |
c7b2cae8 | 1594 | } |
a246b010 | 1595 | |
c7b2cae8 CL |
1596 | /** |
1597 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1598 | * becomes available | |
1599 | * @sk: socket whose state has changed | |
1600 | * | |
1601 | * Called when more output buffer space is available for this socket. | |
1602 | * We try not to wake our writers until they can make "significant" | |
1603 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1604 | * with a bunch of small requests. | |
1605 | */ | |
1606 | static void xs_tcp_write_space(struct sock *sk) | |
1607 | { | |
f064af1e | 1608 | read_lock_bh(&sk->sk_callback_lock); |
c7b2cae8 CL |
1609 | |
1610 | /* from net/core/stream.c:sk_stream_write_space */ | |
64dc6130 | 1611 | if (sk_stream_is_writeable(sk)) |
1f0fa154 | 1612 | xs_write_space(sk); |
b6ddf64f | 1613 | |
f064af1e | 1614 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1615 | } |
1616 | ||
470056c2 | 1617 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1618 | { |
ee0ac0c2 CL |
1619 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1620 | struct sock *sk = transport->inet; | |
a246b010 | 1621 | |
7c6e066e | 1622 | if (transport->rcvsize) { |
a246b010 | 1623 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1624 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1625 | } |
7c6e066e | 1626 | if (transport->sndsize) { |
a246b010 | 1627 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1628 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1629 | sk->sk_write_space(sk); |
1630 | } | |
1631 | } | |
1632 | ||
43118c29 | 1633 | /** |
470056c2 | 1634 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1635 | * @xprt: generic transport |
470056c2 CL |
1636 | * @sndsize: requested size of send buffer, in bytes |
1637 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1638 | * |
470056c2 | 1639 | * Set socket send and receive buffer size limits. |
43118c29 | 1640 | */ |
470056c2 | 1641 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1642 | { |
7c6e066e CL |
1643 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1644 | ||
1645 | transport->sndsize = 0; | |
470056c2 | 1646 | if (sndsize) |
7c6e066e CL |
1647 | transport->sndsize = sndsize + 1024; |
1648 | transport->rcvsize = 0; | |
470056c2 | 1649 | if (rcvsize) |
7c6e066e | 1650 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1651 | |
1652 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1653 | } |
1654 | ||
46c0ee8b CL |
1655 | /** |
1656 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1657 | * @task: task that timed out | |
1658 | * | |
1659 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1660 | */ | |
6a24dfb6 | 1661 | static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) |
46c0ee8b | 1662 | { |
6a24dfb6 | 1663 | xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); |
46c0ee8b CL |
1664 | } |
1665 | ||
b85d8806 CL |
1666 | static unsigned short xs_get_random_port(void) |
1667 | { | |
1668 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1669 | unsigned short rand = (unsigned short) net_random() % range; | |
1670 | return rand + xprt_min_resvport; | |
1671 | } | |
1672 | ||
92200412 CL |
1673 | /** |
1674 | * xs_set_port - reset the port number in the remote endpoint address | |
1675 | * @xprt: generic transport | |
1676 | * @port: new port number | |
1677 | * | |
1678 | */ | |
1679 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1680 | { | |
46121cf7 | 1681 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1682 | |
9dc3b095 CL |
1683 | rpc_set_port(xs_addr(xprt), port); |
1684 | xs_update_peer_port(xprt); | |
92200412 CL |
1685 | } |
1686 | ||
5d4ec932 | 1687 | static unsigned short xs_get_srcport(struct sock_xprt *transport) |
67a391d7 | 1688 | { |
fbfffbd5 | 1689 | unsigned short port = transport->srcport; |
67a391d7 TM |
1690 | |
1691 | if (port == 0 && transport->xprt.resvport) | |
1692 | port = xs_get_random_port(); | |
1693 | return port; | |
1694 | } | |
1695 | ||
baaf4e48 | 1696 | static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
67a391d7 | 1697 | { |
fbfffbd5 CL |
1698 | if (transport->srcport != 0) |
1699 | transport->srcport = 0; | |
67a391d7 TM |
1700 | if (!transport->xprt.resvport) |
1701 | return 0; | |
1702 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1703 | return xprt_max_resvport; | |
1704 | return --port; | |
1705 | } | |
beb59b68 | 1706 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
a246b010 | 1707 | { |
beb59b68 | 1708 | struct sockaddr_storage myaddr; |
67a391d7 | 1709 | int err, nloop = 0; |
5d4ec932 | 1710 | unsigned short port = xs_get_srcport(transport); |
67a391d7 | 1711 | unsigned short last; |
a246b010 | 1712 | |
beb59b68 | 1713 | memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
a246b010 | 1714 | do { |
beb59b68 PE |
1715 | rpc_set_port((struct sockaddr *)&myaddr, port); |
1716 | err = kernel_bind(sock, (struct sockaddr *)&myaddr, | |
1717 | transport->xprt.addrlen); | |
67a391d7 | 1718 | if (port == 0) |
d3bc9a1d | 1719 | break; |
a246b010 | 1720 | if (err == 0) { |
fbfffbd5 | 1721 | transport->srcport = port; |
d3bc9a1d | 1722 | break; |
a246b010 | 1723 | } |
67a391d7 | 1724 | last = port; |
baaf4e48 | 1725 | port = xs_next_srcport(transport, port); |
67a391d7 TM |
1726 | if (port > last) |
1727 | nloop++; | |
1728 | } while (err == -EADDRINUSE && nloop != 2); | |
90058d37 | 1729 | |
4232e863 | 1730 | if (myaddr.ss_family == AF_INET) |
beb59b68 PE |
1731 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
1732 | &((struct sockaddr_in *)&myaddr)->sin_addr, | |
1733 | port, err ? "failed" : "ok", err); | |
1734 | else | |
1735 | dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, | |
1736 | &((struct sockaddr_in6 *)&myaddr)->sin6_addr, | |
1737 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1738 | return err; |
1739 | } | |
1740 | ||
176e21ee CL |
1741 | /* |
1742 | * We don't support autobind on AF_LOCAL sockets | |
1743 | */ | |
1744 | static void xs_local_rpcbind(struct rpc_task *task) | |
1745 | { | |
3dc0da27 TM |
1746 | rcu_read_lock(); |
1747 | xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); | |
1748 | rcu_read_unlock(); | |
176e21ee CL |
1749 | } |
1750 | ||
1751 | static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1752 | { | |
1753 | } | |
beb59b68 | 1754 | |
ed07536e PZ |
1755 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1756 | static struct lock_class_key xs_key[2]; | |
1757 | static struct lock_class_key xs_slock_key[2]; | |
1758 | ||
176e21ee CL |
1759 | static inline void xs_reclassify_socketu(struct socket *sock) |
1760 | { | |
1761 | struct sock *sk = sock->sk; | |
1762 | ||
176e21ee CL |
1763 | sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", |
1764 | &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); | |
1765 | } | |
1766 | ||
8945ee5e | 1767 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1768 | { |
1769 | struct sock *sk = sock->sk; | |
8945ee5e | 1770 | |
8945ee5e CL |
1771 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1772 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1773 | } | |
ed07536e | 1774 | |
8945ee5e CL |
1775 | static inline void xs_reclassify_socket6(struct socket *sock) |
1776 | { | |
1777 | struct sock *sk = sock->sk; | |
ed07536e | 1778 | |
8945ee5e CL |
1779 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1780 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e | 1781 | } |
6bc9638a PE |
1782 | |
1783 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1784 | { | |
1b7a1819 WAA |
1785 | WARN_ON_ONCE(sock_owned_by_user(sock->sk)); |
1786 | if (sock_owned_by_user(sock->sk)) | |
1787 | return; | |
1788 | ||
4232e863 | 1789 | switch (family) { |
176e21ee CL |
1790 | case AF_LOCAL: |
1791 | xs_reclassify_socketu(sock); | |
1792 | break; | |
4232e863 | 1793 | case AF_INET: |
6bc9638a | 1794 | xs_reclassify_socket4(sock); |
4232e863 CL |
1795 | break; |
1796 | case AF_INET6: | |
6bc9638a | 1797 | xs_reclassify_socket6(sock); |
4232e863 CL |
1798 | break; |
1799 | } | |
6bc9638a | 1800 | } |
ed07536e | 1801 | #else |
176e21ee CL |
1802 | static inline void xs_reclassify_socketu(struct socket *sock) |
1803 | { | |
1804 | } | |
1805 | ||
8945ee5e CL |
1806 | static inline void xs_reclassify_socket4(struct socket *sock) |
1807 | { | |
1808 | } | |
1809 | ||
1810 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1811 | { |
1812 | } | |
6bc9638a PE |
1813 | |
1814 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1815 | { | |
1816 | } | |
ed07536e PZ |
1817 | #endif |
1818 | ||
6bc9638a PE |
1819 | static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
1820 | struct sock_xprt *transport, int family, int type, int protocol) | |
22f79326 PE |
1821 | { |
1822 | struct socket *sock; | |
1823 | int err; | |
1824 | ||
6bc9638a | 1825 | err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
22f79326 PE |
1826 | if (err < 0) { |
1827 | dprintk("RPC: can't create %d transport socket (%d).\n", | |
1828 | protocol, -err); | |
1829 | goto out; | |
1830 | } | |
6bc9638a | 1831 | xs_reclassify_socket(family, sock); |
22f79326 | 1832 | |
4cea288a BH |
1833 | err = xs_bind(transport, sock); |
1834 | if (err) { | |
22f79326 PE |
1835 | sock_release(sock); |
1836 | goto out; | |
1837 | } | |
1838 | ||
1839 | return sock; | |
1840 | out: | |
1841 | return ERR_PTR(err); | |
1842 | } | |
1843 | ||
176e21ee CL |
1844 | static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
1845 | struct socket *sock) | |
1846 | { | |
1847 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1848 | xprt); | |
1849 | ||
1850 | if (!transport->inet) { | |
1851 | struct sock *sk = sock->sk; | |
1852 | ||
1853 | write_lock_bh(&sk->sk_callback_lock); | |
1854 | ||
1855 | xs_save_old_callbacks(transport, sk); | |
1856 | ||
1857 | sk->sk_user_data = xprt; | |
1858 | sk->sk_data_ready = xs_local_data_ready; | |
1859 | sk->sk_write_space = xs_udp_write_space; | |
176e21ee CL |
1860 | sk->sk_allocation = GFP_ATOMIC; |
1861 | ||
1862 | xprt_clear_connected(xprt); | |
1863 | ||
1864 | /* Reset to new socket */ | |
1865 | transport->sock = sock; | |
1866 | transport->inet = sk; | |
1867 | ||
1868 | write_unlock_bh(&sk->sk_callback_lock); | |
1869 | } | |
1870 | ||
1871 | /* Tell the socket layer to start connecting... */ | |
1872 | xprt->stat.connect_count++; | |
1873 | xprt->stat.connect_start = jiffies; | |
1874 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); | |
1875 | } | |
1876 | ||
1877 | /** | |
1878 | * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint | |
1879 | * @xprt: RPC transport to connect | |
1880 | * @transport: socket transport to connect | |
1881 | * @create_sock: function to create a socket of the correct type | |
176e21ee | 1882 | */ |
dc107402 | 1883 | static int xs_local_setup_socket(struct sock_xprt *transport) |
176e21ee | 1884 | { |
176e21ee CL |
1885 | struct rpc_xprt *xprt = &transport->xprt; |
1886 | struct socket *sock; | |
1887 | int status = -EIO; | |
1888 | ||
5cf02d09 JL |
1889 | current->flags |= PF_FSTRANS; |
1890 | ||
176e21ee CL |
1891 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1892 | status = __sock_create(xprt->xprt_net, AF_LOCAL, | |
1893 | SOCK_STREAM, 0, &sock, 1); | |
1894 | if (status < 0) { | |
1895 | dprintk("RPC: can't create AF_LOCAL " | |
1896 | "transport socket (%d).\n", -status); | |
1897 | goto out; | |
1898 | } | |
1899 | xs_reclassify_socketu(sock); | |
1900 | ||
1901 | dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", | |
1902 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1903 | ||
1904 | status = xs_local_finish_connecting(xprt, sock); | |
40b5ea0c | 1905 | trace_rpc_socket_connect(xprt, sock, status); |
176e21ee CL |
1906 | switch (status) { |
1907 | case 0: | |
1908 | dprintk("RPC: xprt %p connected to %s\n", | |
1909 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1910 | xprt_set_connected(xprt); | |
1911 | break; | |
1912 | case -ENOENT: | |
1913 | dprintk("RPC: xprt %p: socket %s does not exist\n", | |
1914 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1915 | break; | |
4a20a988 TM |
1916 | case -ECONNREFUSED: |
1917 | dprintk("RPC: xprt %p: connection refused for %s\n", | |
1918 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1919 | break; | |
176e21ee CL |
1920 | default: |
1921 | printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", | |
1922 | __func__, -status, | |
1923 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1924 | } | |
1925 | ||
1926 | out: | |
1927 | xprt_clear_connecting(xprt); | |
1928 | xprt_wake_pending_tasks(xprt, status); | |
5cf02d09 | 1929 | current->flags &= ~PF_FSTRANS; |
dc107402 BF |
1930 | return status; |
1931 | } | |
1932 | ||
b6669737 | 1933 | static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
dc107402 | 1934 | { |
dc107402 BF |
1935 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1936 | int ret; | |
1937 | ||
1938 | if (RPC_IS_ASYNC(task)) { | |
1939 | /* | |
1940 | * We want the AF_LOCAL connect to be resolved in the | |
1941 | * filesystem namespace of the process making the rpc | |
1942 | * call. Thus we connect synchronously. | |
1943 | * | |
1944 | * If we want to support asynchronous AF_LOCAL calls, | |
1945 | * we'll need to figure out how to pass a namespace to | |
1946 | * connect. | |
1947 | */ | |
1948 | rpc_exit(task, -ENOTCONN); | |
1949 | return; | |
1950 | } | |
1951 | ret = xs_local_setup_socket(transport); | |
1952 | if (ret && !RPC_IS_SOFTCONN(task)) | |
1953 | msleep_interruptible(15000); | |
176e21ee CL |
1954 | } |
1955 | ||
a564b8f0 MG |
1956 | #ifdef CONFIG_SUNRPC_SWAP |
1957 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
1958 | { | |
1959 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1960 | xprt); | |
1961 | ||
1962 | if (xprt->swapper) | |
1963 | sk_set_memalloc(transport->inet); | |
1964 | } | |
1965 | ||
1966 | /** | |
1967 | * xs_swapper - Tag this transport as being used for swap. | |
1968 | * @xprt: transport to tag | |
1969 | * @enable: enable/disable | |
1970 | * | |
1971 | */ | |
1972 | int xs_swapper(struct rpc_xprt *xprt, int enable) | |
1973 | { | |
1974 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1975 | xprt); | |
1976 | int err = 0; | |
1977 | ||
1978 | if (enable) { | |
1979 | xprt->swapper++; | |
1980 | xs_set_memalloc(xprt); | |
1981 | } else if (xprt->swapper) { | |
1982 | xprt->swapper--; | |
1983 | sk_clear_memalloc(transport->inet); | |
1984 | } | |
1985 | ||
1986 | return err; | |
1987 | } | |
1988 | EXPORT_SYMBOL_GPL(xs_swapper); | |
1989 | #else | |
1990 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
1991 | { | |
1992 | } | |
1993 | #endif | |
1994 | ||
16be2d20 CL |
1995 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1996 | { | |
1997 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1998 | ||
1999 | if (!transport->inet) { | |
2000 | struct sock *sk = sock->sk; | |
2001 | ||
2002 | write_lock_bh(&sk->sk_callback_lock); | |
2003 | ||
2a9e1cfa TM |
2004 | xs_save_old_callbacks(transport, sk); |
2005 | ||
16be2d20 | 2006 | sk->sk_user_data = xprt; |
16be2d20 CL |
2007 | sk->sk_data_ready = xs_udp_data_ready; |
2008 | sk->sk_write_space = xs_udp_write_space; | |
2009 | sk->sk_no_check = UDP_CSUM_NORCV; | |
2010 | sk->sk_allocation = GFP_ATOMIC; | |
2011 | ||
2012 | xprt_set_connected(xprt); | |
2013 | ||
2014 | /* Reset to new socket */ | |
2015 | transport->sock = sock; | |
2016 | transport->inet = sk; | |
2017 | ||
a564b8f0 MG |
2018 | xs_set_memalloc(xprt); |
2019 | ||
16be2d20 CL |
2020 | write_unlock_bh(&sk->sk_callback_lock); |
2021 | } | |
2022 | xs_udp_do_set_buffer_size(xprt); | |
2023 | } | |
2024 | ||
8c14ff2a | 2025 | static void xs_udp_setup_socket(struct work_struct *work) |
a246b010 | 2026 | { |
34161db6 TM |
2027 | struct sock_xprt *transport = |
2028 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 2029 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 2030 | struct socket *sock = transport->sock; |
b65c0310 | 2031 | int status = -EIO; |
9903cd1c | 2032 | |
5cf02d09 JL |
2033 | current->flags |= PF_FSTRANS; |
2034 | ||
b0d93ad5 | 2035 | /* Start by resetting any existing state */ |
fe315e76 | 2036 | xs_reset_transport(transport); |
8c14ff2a PE |
2037 | sock = xs_create_sock(xprt, transport, |
2038 | xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); | |
b65c0310 | 2039 | if (IS_ERR(sock)) |
b0d93ad5 | 2040 | goto out; |
68e220bd | 2041 | |
c740eff8 CL |
2042 | dprintk("RPC: worker connecting xprt %p via %s to " |
2043 | "%s (port %s)\n", xprt, | |
2044 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2045 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2046 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
2047 | |
2048 | xs_udp_finish_connecting(xprt, sock); | |
40b5ea0c | 2049 | trace_rpc_socket_connect(xprt, sock, 0); |
b0d93ad5 CL |
2050 | status = 0; |
2051 | out: | |
b0d93ad5 | 2052 | xprt_clear_connecting(xprt); |
7d1e8255 | 2053 | xprt_wake_pending_tasks(xprt, status); |
5cf02d09 | 2054 | current->flags &= ~PF_FSTRANS; |
a246b010 CL |
2055 | } |
2056 | ||
3167e12c CL |
2057 | /* |
2058 | * We need to preserve the port number so the reply cache on the server can | |
2059 | * find our cached RPC replies when we get around to reconnecting. | |
2060 | */ | |
58dddac9 | 2061 | static void xs_abort_connection(struct sock_xprt *transport) |
3167e12c CL |
2062 | { |
2063 | int result; | |
3167e12c CL |
2064 | struct sockaddr any; |
2065 | ||
58dddac9 | 2066 | dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); |
3167e12c CL |
2067 | |
2068 | /* | |
2069 | * Disconnect the transport socket by doing a connect operation | |
2070 | * with AF_UNSPEC. This should return immediately... | |
2071 | */ | |
2072 | memset(&any, 0, sizeof(any)); | |
2073 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 2074 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
40b5ea0c TM |
2075 | trace_rpc_socket_reset_connection(&transport->xprt, |
2076 | transport->sock, result); | |
7d1e8255 | 2077 | if (!result) |
4bc1e68e TM |
2078 | xs_sock_reset_connection_flags(&transport->xprt); |
2079 | dprintk("RPC: AF_UNSPEC connect return code %d\n", result); | |
3167e12c CL |
2080 | } |
2081 | ||
58dddac9 | 2082 | static void xs_tcp_reuse_connection(struct sock_xprt *transport) |
40d2549d TM |
2083 | { |
2084 | unsigned int state = transport->inet->sk_state; | |
2085 | ||
669502ff AC |
2086 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { |
2087 | /* we don't need to abort the connection if the socket | |
2088 | * hasn't undergone a shutdown | |
2089 | */ | |
2090 | if (transport->inet->sk_shutdown == 0) | |
2091 | return; | |
2092 | dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", | |
2093 | __func__, transport->inet->sk_shutdown); | |
2094 | } | |
2095 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { | |
2096 | /* we don't need to abort the connection if the socket | |
2097 | * hasn't undergone a shutdown | |
2098 | */ | |
2099 | if (transport->inet->sk_shutdown == 0) | |
2100 | return; | |
2101 | dprintk("RPC: %s: ESTABLISHED/SYN_SENT " | |
2102 | "sk_shutdown set to %d\n", | |
2103 | __func__, transport->inet->sk_shutdown); | |
2104 | } | |
58dddac9 | 2105 | xs_abort_connection(transport); |
40d2549d TM |
2106 | } |
2107 | ||
16be2d20 | 2108 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 2109 | { |
16be2d20 | 2110 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
fe19a96b | 2111 | int ret = -ENOTCONN; |
edb267a6 | 2112 | |
ee0ac0c2 | 2113 | if (!transport->inet) { |
b0d93ad5 | 2114 | struct sock *sk = sock->sk; |
7f260e85 TM |
2115 | unsigned int keepidle = xprt->timeout->to_initval / HZ; |
2116 | unsigned int keepcnt = xprt->timeout->to_retries + 1; | |
2117 | unsigned int opt_on = 1; | |
2118 | ||
2119 | /* TCP Keepalive options */ | |
2120 | kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, | |
2121 | (char *)&opt_on, sizeof(opt_on)); | |
2122 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, | |
2123 | (char *)&keepidle, sizeof(keepidle)); | |
2124 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, | |
2125 | (char *)&keepidle, sizeof(keepidle)); | |
2126 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, | |
2127 | (char *)&keepcnt, sizeof(keepcnt)); | |
b0d93ad5 CL |
2128 | |
2129 | write_lock_bh(&sk->sk_callback_lock); | |
2130 | ||
2a9e1cfa TM |
2131 | xs_save_old_callbacks(transport, sk); |
2132 | ||
b0d93ad5 | 2133 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
2134 | sk->sk_data_ready = xs_tcp_data_ready; |
2135 | sk->sk_state_change = xs_tcp_state_change; | |
2136 | sk->sk_write_space = xs_tcp_write_space; | |
b079fa7b | 2137 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
2138 | |
2139 | /* socket options */ | |
2140 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
2141 | sock_reset_flag(sk, SOCK_LINGER); | |
2142 | tcp_sk(sk)->linger2 = 0; | |
2143 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
2144 | |
2145 | xprt_clear_connected(xprt); | |
2146 | ||
2147 | /* Reset to new socket */ | |
ee0ac0c2 CL |
2148 | transport->sock = sock; |
2149 | transport->inet = sk; | |
b0d93ad5 CL |
2150 | |
2151 | write_unlock_bh(&sk->sk_callback_lock); | |
2152 | } | |
2153 | ||
01d37c42 | 2154 | if (!xprt_bound(xprt)) |
fe19a96b | 2155 | goto out; |
01d37c42 | 2156 | |
a564b8f0 MG |
2157 | xs_set_memalloc(xprt); |
2158 | ||
b0d93ad5 | 2159 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
2160 | xprt->stat.connect_count++; |
2161 | xprt->stat.connect_start = jiffies; | |
fe19a96b TM |
2162 | ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
2163 | switch (ret) { | |
2164 | case 0: | |
2165 | case -EINPROGRESS: | |
2166 | /* SYN_SENT! */ | |
2167 | xprt->connect_cookie++; | |
2168 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
2169 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2170 | } | |
2171 | out: | |
2172 | return ret; | |
16be2d20 CL |
2173 | } |
2174 | ||
9903cd1c | 2175 | /** |
b61d59ff TM |
2176 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
2177 | * @xprt: RPC transport to connect | |
2178 | * @transport: socket transport to connect | |
2179 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
2180 | * |
2181 | * Invoked by a work queue tasklet. | |
a246b010 | 2182 | */ |
cdd518d5 | 2183 | static void xs_tcp_setup_socket(struct work_struct *work) |
a246b010 | 2184 | { |
cdd518d5 PE |
2185 | struct sock_xprt *transport = |
2186 | container_of(work, struct sock_xprt, connect_worker.work); | |
ee0ac0c2 | 2187 | struct socket *sock = transport->sock; |
a9f5f0f7 | 2188 | struct rpc_xprt *xprt = &transport->xprt; |
b61d59ff | 2189 | int status = -EIO; |
a246b010 | 2190 | |
5cf02d09 JL |
2191 | current->flags |= PF_FSTRANS; |
2192 | ||
ee0ac0c2 | 2193 | if (!sock) { |
7d1e8255 | 2194 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
cdd518d5 PE |
2195 | sock = xs_create_sock(xprt, transport, |
2196 | xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); | |
b61d59ff TM |
2197 | if (IS_ERR(sock)) { |
2198 | status = PTR_ERR(sock); | |
3167e12c CL |
2199 | goto out; |
2200 | } | |
7d1e8255 TM |
2201 | } else { |
2202 | int abort_and_exit; | |
a246b010 | 2203 | |
7d1e8255 TM |
2204 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
2205 | &xprt->state); | |
3167e12c | 2206 | /* "close" the socket, preserving the local port */ |
58dddac9 | 2207 | xs_tcp_reuse_connection(transport); |
a246b010 | 2208 | |
7d1e8255 TM |
2209 | if (abort_and_exit) |
2210 | goto out_eagain; | |
2211 | } | |
a246b010 | 2212 | |
c740eff8 CL |
2213 | dprintk("RPC: worker connecting xprt %p via %s to " |
2214 | "%s (port %s)\n", xprt, | |
2215 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2216 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2217 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 2218 | |
16be2d20 | 2219 | status = xs_tcp_finish_connecting(xprt, sock); |
40b5ea0c | 2220 | trace_rpc_socket_connect(xprt, sock, status); |
46121cf7 CL |
2221 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
2222 | xprt, -status, xprt_connected(xprt), | |
2223 | sock->sk->sk_state); | |
2a491991 | 2224 | switch (status) { |
f75e6745 TM |
2225 | default: |
2226 | printk("%s: connect returned unhandled error %d\n", | |
2227 | __func__, status); | |
2228 | case -EADDRNOTAVAIL: | |
2229 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
2230 | * and retry | |
2231 | */ | |
a519fc7a | 2232 | xs_tcp_force_close(xprt); |
88b5ed73 | 2233 | break; |
2a491991 TM |
2234 | case 0: |
2235 | case -EINPROGRESS: | |
2236 | case -EALREADY: | |
7d1e8255 | 2237 | xprt_clear_connecting(xprt); |
5cf02d09 | 2238 | current->flags &= ~PF_FSTRANS; |
7d1e8255 | 2239 | return; |
9fcfe0c8 TM |
2240 | case -EINVAL: |
2241 | /* Happens, for instance, if the user specified a link | |
2242 | * local IPv6 address without a scope-id. | |
2243 | */ | |
3ed5e2a2 TM |
2244 | case -ECONNREFUSED: |
2245 | case -ECONNRESET: | |
2246 | case -ENETUNREACH: | |
2247 | /* retry with existing socket, after a delay */ | |
9fcfe0c8 | 2248 | goto out; |
a246b010 | 2249 | } |
7d1e8255 | 2250 | out_eagain: |
2a491991 | 2251 | status = -EAGAIN; |
a246b010 | 2252 | out: |
68e220bd | 2253 | xprt_clear_connecting(xprt); |
7d1e8255 | 2254 | xprt_wake_pending_tasks(xprt, status); |
5cf02d09 | 2255 | current->flags &= ~PF_FSTRANS; |
68e220bd | 2256 | } |
b0d93ad5 | 2257 | |
9903cd1c CL |
2258 | /** |
2259 | * xs_connect - connect a socket to a remote endpoint | |
1b092092 | 2260 | * @xprt: pointer to transport structure |
9903cd1c CL |
2261 | * @task: address of RPC task that manages state of connect request |
2262 | * | |
2263 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2264 | * |
2265 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2266 | * to guarantee that even unprivileged user processes can set up a | |
2267 | * socket on a privileged port. | |
2268 | * | |
2269 | * If a UDP socket connect fails, the delay behavior here prevents | |
2270 | * retry floods (hard mounts). | |
9903cd1c | 2271 | */ |
1b092092 | 2272 | static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
a246b010 | 2273 | { |
ee0ac0c2 | 2274 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2275 | |
09a21c41 | 2276 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
46121cf7 CL |
2277 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2278 | "seconds\n", | |
03bf4b70 | 2279 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2280 | queue_delayed_work(rpciod_workqueue, |
2281 | &transport->connect_worker, | |
2282 | xprt->reestablish_timeout); | |
03bf4b70 | 2283 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2284 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2285 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2286 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2287 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2288 | } else { |
46121cf7 | 2289 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2290 | queue_delayed_work(rpciod_workqueue, |
2291 | &transport->connect_worker, 0); | |
a246b010 CL |
2292 | } |
2293 | } | |
2294 | ||
176e21ee CL |
2295 | /** |
2296 | * xs_local_print_stats - display AF_LOCAL socket-specifc stats | |
2297 | * @xprt: rpc_xprt struct containing statistics | |
2298 | * @seq: output file | |
2299 | * | |
2300 | */ | |
2301 | static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2302 | { | |
2303 | long idle_time = 0; | |
2304 | ||
2305 | if (xprt_connected(xprt)) | |
2306 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2307 | ||
2308 | seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " | |
15a45206 | 2309 | "%llu %llu %lu %llu %llu\n", |
176e21ee CL |
2310 | xprt->stat.bind_count, |
2311 | xprt->stat.connect_count, | |
2312 | xprt->stat.connect_time, | |
2313 | idle_time, | |
2314 | xprt->stat.sends, | |
2315 | xprt->stat.recvs, | |
2316 | xprt->stat.bad_xids, | |
2317 | xprt->stat.req_u, | |
15a45206 AA |
2318 | xprt->stat.bklog_u, |
2319 | xprt->stat.max_slots, | |
2320 | xprt->stat.sending_u, | |
2321 | xprt->stat.pending_u); | |
176e21ee CL |
2322 | } |
2323 | ||
262ca07d CL |
2324 | /** |
2325 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2326 | * @xprt: rpc_xprt struct containing statistics | |
2327 | * @seq: output file | |
2328 | * | |
2329 | */ | |
2330 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2331 | { | |
c8475461 CL |
2332 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2333 | ||
15a45206 AA |
2334 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " |
2335 | "%lu %llu %llu\n", | |
fbfffbd5 | 2336 | transport->srcport, |
262ca07d CL |
2337 | xprt->stat.bind_count, |
2338 | xprt->stat.sends, | |
2339 | xprt->stat.recvs, | |
2340 | xprt->stat.bad_xids, | |
2341 | xprt->stat.req_u, | |
15a45206 AA |
2342 | xprt->stat.bklog_u, |
2343 | xprt->stat.max_slots, | |
2344 | xprt->stat.sending_u, | |
2345 | xprt->stat.pending_u); | |
262ca07d CL |
2346 | } |
2347 | ||
2348 | /** | |
2349 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2350 | * @xprt: rpc_xprt struct containing statistics | |
2351 | * @seq: output file | |
2352 | * | |
2353 | */ | |
2354 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2355 | { | |
c8475461 | 2356 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2357 | long idle_time = 0; |
2358 | ||
2359 | if (xprt_connected(xprt)) | |
2360 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2361 | ||
15a45206 AA |
2362 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " |
2363 | "%llu %llu %lu %llu %llu\n", | |
fbfffbd5 | 2364 | transport->srcport, |
262ca07d CL |
2365 | xprt->stat.bind_count, |
2366 | xprt->stat.connect_count, | |
2367 | xprt->stat.connect_time, | |
2368 | idle_time, | |
2369 | xprt->stat.sends, | |
2370 | xprt->stat.recvs, | |
2371 | xprt->stat.bad_xids, | |
2372 | xprt->stat.req_u, | |
15a45206 AA |
2373 | xprt->stat.bklog_u, |
2374 | xprt->stat.max_slots, | |
2375 | xprt->stat.sending_u, | |
2376 | xprt->stat.pending_u); | |
262ca07d CL |
2377 | } |
2378 | ||
4cfc7e60 RI |
2379 | /* |
2380 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2381 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2382 | * to use the server side send routines. | |
2383 | */ | |
5a51f13a | 2384 | static void *bc_malloc(struct rpc_task *task, size_t size) |
4cfc7e60 RI |
2385 | { |
2386 | struct page *page; | |
2387 | struct rpc_buffer *buf; | |
2388 | ||
b8a13d03 WAA |
2389 | WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); |
2390 | if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) | |
2391 | return NULL; | |
4cfc7e60 | 2392 | |
b8a13d03 | 2393 | page = alloc_page(GFP_KERNEL); |
4cfc7e60 RI |
2394 | if (!page) |
2395 | return NULL; | |
2396 | ||
2397 | buf = page_address(page); | |
2398 | buf->len = PAGE_SIZE; | |
2399 | ||
2400 | return buf->data; | |
2401 | } | |
2402 | ||
2403 | /* | |
2404 | * Free the space allocated in the bc_alloc routine | |
2405 | */ | |
5a51f13a | 2406 | static void bc_free(void *buffer) |
4cfc7e60 RI |
2407 | { |
2408 | struct rpc_buffer *buf; | |
2409 | ||
2410 | if (!buffer) | |
2411 | return; | |
2412 | ||
2413 | buf = container_of(buffer, struct rpc_buffer, data); | |
2414 | free_page((unsigned long)buf); | |
2415 | } | |
2416 | ||
2417 | /* | |
2418 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2419 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2420 | */ | |
2421 | static int bc_sendto(struct rpc_rqst *req) | |
2422 | { | |
2423 | int len; | |
2424 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2425 | struct rpc_xprt *xprt = req->rq_xprt; | |
2426 | struct sock_xprt *transport = | |
2427 | container_of(xprt, struct sock_xprt, xprt); | |
2428 | struct socket *sock = transport->sock; | |
2429 | unsigned long headoff; | |
2430 | unsigned long tailoff; | |
2431 | ||
61677eee | 2432 | xs_encode_stream_record_marker(xbufp); |
4cfc7e60 RI |
2433 | |
2434 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2435 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2436 | len = svc_send_common(sock, xbufp, | |
2437 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2438 | xbufp->tail[0].iov_base, tailoff); | |
2439 | ||
2440 | if (len != xbufp->len) { | |
2441 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2442 | len = -EAGAIN; | |
2443 | } | |
2444 | ||
2445 | return len; | |
2446 | } | |
2447 | ||
2448 | /* | |
2449 | * The send routine. Borrows from svc_send | |
2450 | */ | |
2451 | static int bc_send_request(struct rpc_task *task) | |
2452 | { | |
2453 | struct rpc_rqst *req = task->tk_rqstp; | |
2454 | struct svc_xprt *xprt; | |
4cfc7e60 RI |
2455 | u32 len; |
2456 | ||
2457 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2458 | /* | |
2459 | * Get the server socket associated with this callback xprt | |
2460 | */ | |
2461 | xprt = req->rq_xprt->bc_xprt; | |
4cfc7e60 RI |
2462 | |
2463 | /* | |
2464 | * Grab the mutex to serialize data as the connection is shared | |
2465 | * with the fore channel | |
2466 | */ | |
2467 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2468 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2469 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2470 | return -EAGAIN; | |
2471 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2472 | } | |
2473 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2474 | len = -ENOTCONN; | |
2475 | else | |
2476 | len = bc_sendto(req); | |
2477 | mutex_unlock(&xprt->xpt_mutex); | |
2478 | ||
2479 | if (len > 0) | |
2480 | len = 0; | |
2481 | ||
2482 | return len; | |
2483 | } | |
2484 | ||
2485 | /* | |
2486 | * The close routine. Since this is client initiated, we do nothing | |
2487 | */ | |
2488 | ||
2489 | static void bc_close(struct rpc_xprt *xprt) | |
2490 | { | |
4cfc7e60 RI |
2491 | } |
2492 | ||
2493 | /* | |
2494 | * The xprt destroy routine. Again, because this connection is client | |
2495 | * initiated, we do nothing | |
2496 | */ | |
2497 | ||
2498 | static void bc_destroy(struct rpc_xprt *xprt) | |
2499 | { | |
4cfc7e60 RI |
2500 | } |
2501 | ||
176e21ee CL |
2502 | static struct rpc_xprt_ops xs_local_ops = { |
2503 | .reserve_xprt = xprt_reserve_xprt, | |
2504 | .release_xprt = xs_tcp_release_xprt, | |
f39c1bfb | 2505 | .alloc_slot = xprt_alloc_slot, |
176e21ee CL |
2506 | .rpcbind = xs_local_rpcbind, |
2507 | .set_port = xs_local_set_port, | |
dc107402 | 2508 | .connect = xs_local_connect, |
176e21ee CL |
2509 | .buf_alloc = rpc_malloc, |
2510 | .buf_free = rpc_free, | |
2511 | .send_request = xs_local_send_request, | |
2512 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2513 | .close = xs_close, | |
190b1ecf | 2514 | .destroy = xs_local_destroy, |
176e21ee CL |
2515 | .print_stats = xs_local_print_stats, |
2516 | }; | |
2517 | ||
262965f5 | 2518 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2519 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2520 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2521 | .release_xprt = xprt_release_xprt_cong, |
f39c1bfb | 2522 | .alloc_slot = xprt_alloc_slot, |
45160d62 | 2523 | .rpcbind = rpcb_getport_async, |
92200412 | 2524 | .set_port = xs_set_port, |
262965f5 | 2525 | .connect = xs_connect, |
02107148 CL |
2526 | .buf_alloc = rpc_malloc, |
2527 | .buf_free = rpc_free, | |
262965f5 | 2528 | .send_request = xs_udp_send_request, |
fe3aca29 | 2529 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2530 | .timer = xs_udp_timer, |
a58dd398 | 2531 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2532 | .close = xs_close, |
2533 | .destroy = xs_destroy, | |
262ca07d | 2534 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2535 | }; |
2536 | ||
2537 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2538 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2539 | .release_xprt = xs_tcp_release_xprt, |
f39c1bfb | 2540 | .alloc_slot = xprt_lock_and_alloc_slot, |
45160d62 | 2541 | .rpcbind = rpcb_getport_async, |
92200412 | 2542 | .set_port = xs_set_port, |
0b9e7943 | 2543 | .connect = xs_connect, |
02107148 CL |
2544 | .buf_alloc = rpc_malloc, |
2545 | .buf_free = rpc_free, | |
262965f5 | 2546 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2547 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
f75e6745 | 2548 | .close = xs_tcp_close, |
9903cd1c | 2549 | .destroy = xs_destroy, |
262ca07d | 2550 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2551 | }; |
2552 | ||
4cfc7e60 RI |
2553 | /* |
2554 | * The rpc_xprt_ops for the server backchannel | |
2555 | */ | |
2556 | ||
2557 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2558 | .reserve_xprt = xprt_reserve_xprt, | |
2559 | .release_xprt = xprt_release_xprt, | |
84e28a30 | 2560 | .alloc_slot = xprt_alloc_slot, |
4cfc7e60 RI |
2561 | .buf_alloc = bc_malloc, |
2562 | .buf_free = bc_free, | |
2563 | .send_request = bc_send_request, | |
2564 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2565 | .close = bc_close, | |
2566 | .destroy = bc_destroy, | |
2567 | .print_stats = xs_tcp_print_stats, | |
2568 | }; | |
2569 | ||
92476850 CL |
2570 | static int xs_init_anyaddr(const int family, struct sockaddr *sap) |
2571 | { | |
2572 | static const struct sockaddr_in sin = { | |
2573 | .sin_family = AF_INET, | |
2574 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
2575 | }; | |
2576 | static const struct sockaddr_in6 sin6 = { | |
2577 | .sin6_family = AF_INET6, | |
2578 | .sin6_addr = IN6ADDR_ANY_INIT, | |
2579 | }; | |
2580 | ||
2581 | switch (family) { | |
176e21ee CL |
2582 | case AF_LOCAL: |
2583 | break; | |
92476850 CL |
2584 | case AF_INET: |
2585 | memcpy(sap, &sin, sizeof(sin)); | |
2586 | break; | |
2587 | case AF_INET6: | |
2588 | memcpy(sap, &sin6, sizeof(sin6)); | |
2589 | break; | |
2590 | default: | |
2591 | dprintk("RPC: %s: Bad address family\n", __func__); | |
2592 | return -EAFNOSUPPORT; | |
2593 | } | |
2594 | return 0; | |
2595 | } | |
2596 | ||
3c341b0b | 2597 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
d9ba131d TM |
2598 | unsigned int slot_table_size, |
2599 | unsigned int max_slot_table_size) | |
c8541ecd CL |
2600 | { |
2601 | struct rpc_xprt *xprt; | |
ffc2e518 | 2602 | struct sock_xprt *new; |
c8541ecd | 2603 | |
96802a09 | 2604 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2605 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2606 | return ERR_PTR(-EBADF); |
2607 | } | |
2608 | ||
d9ba131d TM |
2609 | xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, |
2610 | max_slot_table_size); | |
bd1722d4 | 2611 | if (xprt == NULL) { |
46121cf7 CL |
2612 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2613 | "rpc_xprt\n"); | |
c8541ecd CL |
2614 | return ERR_PTR(-ENOMEM); |
2615 | } | |
c8541ecd | 2616 | |
bd1722d4 | 2617 | new = container_of(xprt, struct sock_xprt, xprt); |
96802a09 FM |
2618 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2619 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2620 | if (args->srcaddr) |
fbfffbd5 | 2621 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
92476850 CL |
2622 | else { |
2623 | int err; | |
2624 | err = xs_init_anyaddr(args->dstaddr->sa_family, | |
2625 | (struct sockaddr *)&new->srcaddr); | |
2aa13531 SK |
2626 | if (err != 0) { |
2627 | xprt_free(xprt); | |
92476850 | 2628 | return ERR_PTR(err); |
2aa13531 | 2629 | } |
92476850 | 2630 | } |
c8541ecd CL |
2631 | |
2632 | return xprt; | |
2633 | } | |
2634 | ||
176e21ee CL |
2635 | static const struct rpc_timeout xs_local_default_timeout = { |
2636 | .to_initval = 10 * HZ, | |
2637 | .to_maxval = 10 * HZ, | |
2638 | .to_retries = 2, | |
2639 | }; | |
2640 | ||
2641 | /** | |
2642 | * xs_setup_local - Set up transport to use an AF_LOCAL socket | |
2643 | * @args: rpc transport creation arguments | |
2644 | * | |
2645 | * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP | |
2646 | */ | |
2647 | static struct rpc_xprt *xs_setup_local(struct xprt_create *args) | |
2648 | { | |
2649 | struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; | |
2650 | struct sock_xprt *transport; | |
2651 | struct rpc_xprt *xprt; | |
2652 | struct rpc_xprt *ret; | |
2653 | ||
d9ba131d TM |
2654 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2655 | xprt_max_tcp_slot_table_entries); | |
176e21ee CL |
2656 | if (IS_ERR(xprt)) |
2657 | return xprt; | |
2658 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2659 | ||
2660 | xprt->prot = 0; | |
2661 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2662 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2663 | ||
2664 | xprt->bind_timeout = XS_BIND_TO; | |
2665 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2666 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
2667 | ||
2668 | xprt->ops = &xs_local_ops; | |
2669 | xprt->timeout = &xs_local_default_timeout; | |
2670 | ||
2671 | switch (sun->sun_family) { | |
2672 | case AF_LOCAL: | |
2673 | if (sun->sun_path[0] != '/') { | |
2674 | dprintk("RPC: bad AF_LOCAL address: %s\n", | |
2675 | sun->sun_path); | |
2676 | ret = ERR_PTR(-EINVAL); | |
2677 | goto out_err; | |
2678 | } | |
2679 | xprt_set_bound(xprt); | |
176e21ee | 2680 | xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); |
7073ea87 BF |
2681 | ret = ERR_PTR(xs_local_setup_socket(transport)); |
2682 | if (ret) | |
2683 | goto out_err; | |
176e21ee CL |
2684 | break; |
2685 | default: | |
2686 | ret = ERR_PTR(-EAFNOSUPPORT); | |
2687 | goto out_err; | |
2688 | } | |
2689 | ||
2690 | dprintk("RPC: set up xprt to %s via AF_LOCAL\n", | |
2691 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2692 | ||
2693 | if (try_module_get(THIS_MODULE)) | |
2694 | return xprt; | |
2695 | ret = ERR_PTR(-EINVAL); | |
2696 | out_err: | |
2697 | xprt_free(xprt); | |
2698 | return ret; | |
2699 | } | |
2700 | ||
2881ae74 TM |
2701 | static const struct rpc_timeout xs_udp_default_timeout = { |
2702 | .to_initval = 5 * HZ, | |
2703 | .to_maxval = 30 * HZ, | |
2704 | .to_increment = 5 * HZ, | |
2705 | .to_retries = 5, | |
2706 | }; | |
2707 | ||
9903cd1c CL |
2708 | /** |
2709 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2710 | * @args: rpc transport creation arguments |
9903cd1c CL |
2711 | * |
2712 | */ | |
483066d6 | 2713 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2714 | { |
8f9d5b1a | 2715 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2716 | struct rpc_xprt *xprt; |
c8475461 | 2717 | struct sock_xprt *transport; |
0a68b0be | 2718 | struct rpc_xprt *ret; |
a246b010 | 2719 | |
d9ba131d TM |
2720 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, |
2721 | xprt_udp_slot_table_entries); | |
c8541ecd CL |
2722 | if (IS_ERR(xprt)) |
2723 | return xprt; | |
c8475461 | 2724 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2725 | |
ec739ef0 | 2726 | xprt->prot = IPPROTO_UDP; |
808012fb | 2727 | xprt->tsh_size = 0; |
a246b010 CL |
2728 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2729 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2730 | ||
03bf4b70 | 2731 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2732 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2733 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2734 | |
262965f5 | 2735 | xprt->ops = &xs_udp_ops; |
a246b010 | 2736 | |
ba7392bb | 2737 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2738 | |
8f9d5b1a CL |
2739 | switch (addr->sa_family) { |
2740 | case AF_INET: | |
2741 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2742 | xprt_set_bound(xprt); | |
2743 | ||
2744 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2745 | xs_udp_setup_socket); |
9dc3b095 | 2746 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2747 | break; |
2748 | case AF_INET6: | |
2749 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2750 | xprt_set_bound(xprt); | |
2751 | ||
2752 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2753 | xs_udp_setup_socket); |
9dc3b095 | 2754 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2755 | break; |
2756 | default: | |
0a68b0be BF |
2757 | ret = ERR_PTR(-EAFNOSUPPORT); |
2758 | goto out_err; | |
8f9d5b1a CL |
2759 | } |
2760 | ||
c740eff8 CL |
2761 | if (xprt_bound(xprt)) |
2762 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2763 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2764 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2765 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2766 | else | |
2767 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2768 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2769 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2770 | |
bc25571e TT |
2771 | if (try_module_get(THIS_MODULE)) |
2772 | return xprt; | |
0a68b0be BF |
2773 | ret = ERR_PTR(-EINVAL); |
2774 | out_err: | |
e204e621 | 2775 | xprt_free(xprt); |
0a68b0be | 2776 | return ret; |
a246b010 CL |
2777 | } |
2778 | ||
2881ae74 TM |
2779 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2780 | .to_initval = 60 * HZ, | |
2781 | .to_maxval = 60 * HZ, | |
2782 | .to_retries = 2, | |
2783 | }; | |
2784 | ||
9903cd1c CL |
2785 | /** |
2786 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2787 | * @args: rpc transport creation arguments |
9903cd1c CL |
2788 | * |
2789 | */ | |
483066d6 | 2790 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2791 | { |
8f9d5b1a | 2792 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2793 | struct rpc_xprt *xprt; |
c8475461 | 2794 | struct sock_xprt *transport; |
0a68b0be | 2795 | struct rpc_xprt *ret; |
b7993ceb TM |
2796 | unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; |
2797 | ||
2798 | if (args->flags & XPRT_CREATE_INFINITE_SLOTS) | |
2799 | max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; | |
a246b010 | 2800 | |
d9ba131d | 2801 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
b7993ceb | 2802 | max_slot_table_size); |
c8541ecd CL |
2803 | if (IS_ERR(xprt)) |
2804 | return xprt; | |
c8475461 | 2805 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2806 | |
ec739ef0 | 2807 | xprt->prot = IPPROTO_TCP; |
808012fb | 2808 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2809 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2810 | |
03bf4b70 | 2811 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2812 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2813 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2814 | |
262965f5 | 2815 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2816 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2817 | |
8f9d5b1a CL |
2818 | switch (addr->sa_family) { |
2819 | case AF_INET: | |
2820 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2821 | xprt_set_bound(xprt); | |
2822 | ||
9dc3b095 | 2823 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2824 | xs_tcp_setup_socket); |
9dc3b095 | 2825 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2826 | break; |
2827 | case AF_INET6: | |
2828 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2829 | xprt_set_bound(xprt); | |
2830 | ||
9dc3b095 | 2831 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2832 | xs_tcp_setup_socket); |
9dc3b095 | 2833 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2834 | break; |
2835 | default: | |
0a68b0be BF |
2836 | ret = ERR_PTR(-EAFNOSUPPORT); |
2837 | goto out_err; | |
8f9d5b1a CL |
2838 | } |
2839 | ||
c740eff8 CL |
2840 | if (xprt_bound(xprt)) |
2841 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2842 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2843 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2844 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2845 | else | |
2846 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2847 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2848 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2849 | ||
edb267a6 | 2850 | |
bc25571e TT |
2851 | if (try_module_get(THIS_MODULE)) |
2852 | return xprt; | |
0a68b0be BF |
2853 | ret = ERR_PTR(-EINVAL); |
2854 | out_err: | |
e204e621 | 2855 | xprt_free(xprt); |
0a68b0be | 2856 | return ret; |
a246b010 | 2857 | } |
282b32e1 | 2858 | |
f300baba AB |
2859 | /** |
2860 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2861 | * @args: rpc transport creation arguments | |
2862 | * | |
2863 | */ | |
2864 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2865 | { | |
2866 | struct sockaddr *addr = args->dstaddr; | |
2867 | struct rpc_xprt *xprt; | |
2868 | struct sock_xprt *transport; | |
2869 | struct svc_sock *bc_sock; | |
0a68b0be | 2870 | struct rpc_xprt *ret; |
f300baba | 2871 | |
f0418aa4 BF |
2872 | if (args->bc_xprt->xpt_bc_xprt) { |
2873 | /* | |
2874 | * This server connection already has a backchannel | |
2875 | * export; we can't create a new one, as we wouldn't be | |
2876 | * able to match replies based on xid any more. So, | |
2877 | * reuse the already-existing one: | |
2878 | */ | |
2879 | return args->bc_xprt->xpt_bc_xprt; | |
2880 | } | |
d9ba131d TM |
2881 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2882 | xprt_tcp_slot_table_entries); | |
f300baba AB |
2883 | if (IS_ERR(xprt)) |
2884 | return xprt; | |
2885 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2886 | ||
2887 | xprt->prot = IPPROTO_TCP; | |
2888 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2889 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2890 | xprt->timeout = &xs_tcp_default_timeout; | |
2891 | ||
2892 | /* backchannel */ | |
2893 | xprt_set_bound(xprt); | |
2894 | xprt->bind_timeout = 0; | |
f300baba AB |
2895 | xprt->reestablish_timeout = 0; |
2896 | xprt->idle_timeout = 0; | |
2897 | ||
f300baba AB |
2898 | xprt->ops = &bc_tcp_ops; |
2899 | ||
2900 | switch (addr->sa_family) { | |
2901 | case AF_INET: | |
2902 | xs_format_peer_addresses(xprt, "tcp", | |
2903 | RPCBIND_NETID_TCP); | |
2904 | break; | |
2905 | case AF_INET6: | |
2906 | xs_format_peer_addresses(xprt, "tcp", | |
2907 | RPCBIND_NETID_TCP6); | |
2908 | break; | |
2909 | default: | |
0a68b0be BF |
2910 | ret = ERR_PTR(-EAFNOSUPPORT); |
2911 | goto out_err; | |
f300baba AB |
2912 | } |
2913 | ||
50fa0d40 PE |
2914 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2915 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2916 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2917 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
f300baba | 2918 | |
99de8ea9 BF |
2919 | /* |
2920 | * Once we've associated a backchannel xprt with a connection, | |
2921 | * we want to keep it around as long as long as the connection | |
2922 | * lasts, in case we need to start using it for a backchannel | |
2923 | * again; this reference won't be dropped until bc_xprt is | |
2924 | * destroyed. | |
2925 | */ | |
2926 | xprt_get(xprt); | |
2927 | args->bc_xprt->xpt_bc_xprt = xprt; | |
2928 | xprt->bc_xprt = args->bc_xprt; | |
2929 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
2930 | transport->sock = bc_sock->sk_sock; | |
2931 | transport->inet = bc_sock->sk_sk; | |
2932 | ||
f300baba AB |
2933 | /* |
2934 | * Since we don't want connections for the backchannel, we set | |
2935 | * the xprt status to connected | |
2936 | */ | |
2937 | xprt_set_connected(xprt); | |
2938 | ||
2939 | ||
2940 | if (try_module_get(THIS_MODULE)) | |
2941 | return xprt; | |
99de8ea9 | 2942 | xprt_put(xprt); |
0a68b0be BF |
2943 | ret = ERR_PTR(-EINVAL); |
2944 | out_err: | |
e204e621 | 2945 | xprt_free(xprt); |
0a68b0be | 2946 | return ret; |
f300baba AB |
2947 | } |
2948 | ||
176e21ee CL |
2949 | static struct xprt_class xs_local_transport = { |
2950 | .list = LIST_HEAD_INIT(xs_local_transport.list), | |
2951 | .name = "named UNIX socket", | |
2952 | .owner = THIS_MODULE, | |
2953 | .ident = XPRT_TRANSPORT_LOCAL, | |
2954 | .setup = xs_setup_local, | |
2955 | }; | |
2956 | ||
bc25571e TT |
2957 | static struct xprt_class xs_udp_transport = { |
2958 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2959 | .name = "udp", | |
2960 | .owner = THIS_MODULE, | |
f300baba | 2961 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
2962 | .setup = xs_setup_udp, |
2963 | }; | |
2964 | ||
2965 | static struct xprt_class xs_tcp_transport = { | |
2966 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2967 | .name = "tcp", | |
2968 | .owner = THIS_MODULE, | |
f300baba | 2969 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
2970 | .setup = xs_setup_tcp, |
2971 | }; | |
2972 | ||
f300baba AB |
2973 | static struct xprt_class xs_bc_tcp_transport = { |
2974 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
2975 | .name = "tcp NFSv4.1 backchannel", | |
2976 | .owner = THIS_MODULE, | |
2977 | .ident = XPRT_TRANSPORT_BC_TCP, | |
2978 | .setup = xs_setup_bc_tcp, | |
2979 | }; | |
2980 | ||
282b32e1 | 2981 | /** |
bc25571e | 2982 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2983 | * |
2984 | */ | |
2985 | int init_socket_xprt(void) | |
2986 | { | |
fbf76683 | 2987 | #ifdef RPC_DEBUG |
2b1bec5f | 2988 | if (!sunrpc_table_header) |
0b4d4147 | 2989 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2990 | #endif |
2991 | ||
176e21ee | 2992 | xprt_register_transport(&xs_local_transport); |
bc25571e TT |
2993 | xprt_register_transport(&xs_udp_transport); |
2994 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 2995 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 2996 | |
282b32e1 CL |
2997 | return 0; |
2998 | } | |
2999 | ||
3000 | /** | |
bc25571e | 3001 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
3002 | * |
3003 | */ | |
3004 | void cleanup_socket_xprt(void) | |
3005 | { | |
fbf76683 CL |
3006 | #ifdef RPC_DEBUG |
3007 | if (sunrpc_table_header) { | |
3008 | unregister_sysctl_table(sunrpc_table_header); | |
3009 | sunrpc_table_header = NULL; | |
3010 | } | |
3011 | #endif | |
bc25571e | 3012 | |
176e21ee | 3013 | xprt_unregister_transport(&xs_local_transport); |
bc25571e TT |
3014 | xprt_unregister_transport(&xs_udp_transport); |
3015 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 3016 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 3017 | } |
cbf11071 | 3018 | |
9bbb9e5a RR |
3019 | static int param_set_uint_minmax(const char *val, |
3020 | const struct kernel_param *kp, | |
cbf11071 TM |
3021 | unsigned int min, unsigned int max) |
3022 | { | |
3023 | unsigned long num; | |
3024 | int ret; | |
3025 | ||
3026 | if (!val) | |
3027 | return -EINVAL; | |
3028 | ret = strict_strtoul(val, 0, &num); | |
3029 | if (ret == -EINVAL || num < min || num > max) | |
3030 | return -EINVAL; | |
3031 | *((unsigned int *)kp->arg) = num; | |
3032 | return 0; | |
3033 | } | |
3034 | ||
9bbb9e5a | 3035 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
cbf11071 TM |
3036 | { |
3037 | return param_set_uint_minmax(val, kp, | |
3038 | RPC_MIN_RESVPORT, | |
3039 | RPC_MAX_RESVPORT); | |
3040 | } | |
3041 | ||
9bbb9e5a RR |
3042 | static struct kernel_param_ops param_ops_portnr = { |
3043 | .set = param_set_portnr, | |
3044 | .get = param_get_uint, | |
3045 | }; | |
3046 | ||
cbf11071 TM |
3047 | #define param_check_portnr(name, p) \ |
3048 | __param_check(name, p, unsigned int); | |
3049 | ||
3050 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
3051 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
3052 | ||
9bbb9e5a RR |
3053 | static int param_set_slot_table_size(const char *val, |
3054 | const struct kernel_param *kp) | |
cbf11071 TM |
3055 | { |
3056 | return param_set_uint_minmax(val, kp, | |
3057 | RPC_MIN_SLOT_TABLE, | |
3058 | RPC_MAX_SLOT_TABLE); | |
3059 | } | |
3060 | ||
9bbb9e5a RR |
3061 | static struct kernel_param_ops param_ops_slot_table_size = { |
3062 | .set = param_set_slot_table_size, | |
3063 | .get = param_get_uint, | |
3064 | }; | |
3065 | ||
cbf11071 TM |
3066 | #define param_check_slot_table_size(name, p) \ |
3067 | __param_check(name, p, unsigned int); | |
3068 | ||
d9ba131d TM |
3069 | static int param_set_max_slot_table_size(const char *val, |
3070 | const struct kernel_param *kp) | |
3071 | { | |
3072 | return param_set_uint_minmax(val, kp, | |
3073 | RPC_MIN_SLOT_TABLE, | |
3074 | RPC_MAX_SLOT_TABLE_LIMIT); | |
3075 | } | |
3076 | ||
3077 | static struct kernel_param_ops param_ops_max_slot_table_size = { | |
3078 | .set = param_set_max_slot_table_size, | |
3079 | .get = param_get_uint, | |
3080 | }; | |
3081 | ||
3082 | #define param_check_max_slot_table_size(name, p) \ | |
3083 | __param_check(name, p, unsigned int); | |
3084 | ||
cbf11071 TM |
3085 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
3086 | slot_table_size, 0644); | |
d9ba131d TM |
3087 | module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, |
3088 | max_slot_table_size, 0644); | |
cbf11071 TM |
3089 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
3090 | slot_table_size, 0644); | |
3091 |