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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 *); | |
2118071d | 260 | void (*old_error_report)(struct sock *); |
ffc2e518 CL |
261 | }; |
262 | ||
e136d092 CL |
263 | /* |
264 | * TCP receive state flags | |
265 | */ | |
266 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
267 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
268 | #define TCP_RCV_COPY_XID (1UL << 2) | |
269 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
f4a2e418 RL |
270 | #define TCP_RCV_READ_CALLDIR (1UL << 4) |
271 | #define TCP_RCV_COPY_CALLDIR (1UL << 5) | |
18dca02a RL |
272 | |
273 | /* | |
274 | * TCP RPC flags | |
275 | */ | |
f4a2e418 | 276 | #define TCP_RPC_REPLY (1UL << 6) |
e136d092 | 277 | |
2118071d TM |
278 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
279 | { | |
280 | return (struct rpc_xprt *) sk->sk_user_data; | |
281 | } | |
282 | ||
95392c59 CL |
283 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
284 | { | |
285 | return (struct sockaddr *) &xprt->addr; | |
286 | } | |
287 | ||
176e21ee CL |
288 | static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) |
289 | { | |
290 | return (struct sockaddr_un *) &xprt->addr; | |
291 | } | |
292 | ||
95392c59 | 293 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
edb267a6 | 294 | { |
95392c59 CL |
295 | return (struct sockaddr_in *) &xprt->addr; |
296 | } | |
297 | ||
298 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
299 | { | |
300 | return (struct sockaddr_in6 *) &xprt->addr; | |
301 | } | |
302 | ||
c877b849 | 303 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 304 | { |
c877b849 | 305 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
306 | struct sockaddr_in6 *sin6; |
307 | struct sockaddr_in *sin; | |
176e21ee | 308 | struct sockaddr_un *sun; |
c877b849 | 309 | char buf[128]; |
edb267a6 | 310 | |
9dc3b095 | 311 | switch (sap->sa_family) { |
176e21ee CL |
312 | case AF_LOCAL: |
313 | sun = xs_addr_un(xprt); | |
314 | strlcpy(buf, sun->sun_path, sizeof(buf)); | |
315 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
316 | kstrdup(buf, GFP_KERNEL); | |
317 | break; | |
9dc3b095 | 318 | case AF_INET: |
176e21ee CL |
319 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
320 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
321 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 322 | sin = xs_addr_in(xprt); |
fc0b5791 | 323 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
9dc3b095 CL |
324 | break; |
325 | case AF_INET6: | |
176e21ee CL |
326 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
327 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
328 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 329 | sin6 = xs_addr_in6(xprt); |
fc0b5791 | 330 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
9dc3b095 CL |
331 | break; |
332 | default: | |
333 | BUG(); | |
756805e7 | 334 | } |
176e21ee | 335 | |
9dc3b095 | 336 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
337 | } |
338 | ||
9dc3b095 | 339 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 340 | { |
9dc3b095 CL |
341 | struct sockaddr *sap = xs_addr(xprt); |
342 | char buf[128]; | |
4b6473fb | 343 | |
81160e66 | 344 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 345 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
4b6473fb | 346 | |
81160e66 | 347 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 CL |
348 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
349 | } | |
4b6473fb | 350 | |
9dc3b095 CL |
351 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
352 | const char *protocol, | |
353 | const char *netid) | |
c877b849 | 354 | { |
b454ae90 | 355 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 356 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 357 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 358 | xs_format_common_peer_ports(xprt); |
edb267a6 | 359 | } |
4b6473fb | 360 | |
9dc3b095 | 361 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 362 | { |
9dc3b095 CL |
363 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
364 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 365 | |
9dc3b095 | 366 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
367 | } |
368 | ||
369 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
370 | { | |
33e01dc7 CL |
371 | unsigned int i; |
372 | ||
373 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
374 | switch (i) { | |
375 | case RPC_DISPLAY_PROTO: | |
376 | case RPC_DISPLAY_NETID: | |
377 | continue; | |
378 | default: | |
379 | kfree(xprt->address_strings[i]); | |
380 | } | |
edb267a6 CL |
381 | } |
382 | ||
b4b5cc85 CL |
383 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
384 | ||
24c5684b | 385 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 386 | { |
b4b5cc85 CL |
387 | struct msghdr msg = { |
388 | .msg_name = addr, | |
389 | .msg_namelen = addrlen, | |
24c5684b TM |
390 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
391 | }; | |
392 | struct kvec iov = { | |
393 | .iov_base = vec->iov_base + base, | |
394 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
395 | }; |
396 | ||
24c5684b | 397 | if (iov.iov_len != 0) |
b4b5cc85 CL |
398 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
399 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
400 | } | |
401 | ||
a6b31d18 | 402 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy) |
b4b5cc85 | 403 | { |
a6b31d18 TM |
404 | ssize_t (*do_sendpage)(struct socket *sock, struct page *page, |
405 | int offset, size_t size, int flags); | |
24c5684b TM |
406 | struct page **ppage; |
407 | unsigned int remainder; | |
408 | int err, sent = 0; | |
409 | ||
410 | remainder = xdr->page_len - base; | |
411 | base += xdr->page_base; | |
412 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
413 | base &= ~PAGE_MASK; | |
a6b31d18 TM |
414 | do_sendpage = sock->ops->sendpage; |
415 | if (!zerocopy) | |
416 | do_sendpage = sock_no_sendpage; | |
24c5684b TM |
417 | for(;;) { |
418 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
419 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 420 | |
24c5684b TM |
421 | remainder -= len; |
422 | if (remainder != 0 || more) | |
423 | flags |= MSG_MORE; | |
a6b31d18 | 424 | err = do_sendpage(sock, *ppage, base, len, flags); |
24c5684b TM |
425 | if (remainder == 0 || err != len) |
426 | break; | |
427 | sent += err; | |
428 | ppage++; | |
429 | base = 0; | |
430 | } | |
431 | if (sent == 0) | |
432 | return err; | |
433 | if (err > 0) | |
434 | sent += err; | |
435 | return sent; | |
b4b5cc85 CL |
436 | } |
437 | ||
9903cd1c CL |
438 | /** |
439 | * xs_sendpages - write pages directly to a socket | |
440 | * @sock: socket to send on | |
441 | * @addr: UDP only -- address of destination | |
442 | * @addrlen: UDP only -- length of destination address | |
443 | * @xdr: buffer containing this request | |
444 | * @base: starting position in the buffer | |
a6b31d18 | 445 | * @zerocopy: true if it is safe to use sendpage() |
9903cd1c | 446 | * |
a246b010 | 447 | */ |
a6b31d18 | 448 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy) |
a246b010 | 449 | { |
24c5684b TM |
450 | unsigned int remainder = xdr->len - base; |
451 | int err, sent = 0; | |
a246b010 | 452 | |
262965f5 | 453 | if (unlikely(!sock)) |
fba91afb | 454 | return -ENOTSOCK; |
262965f5 CL |
455 | |
456 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
457 | if (base != 0) { |
458 | addr = NULL; | |
459 | addrlen = 0; | |
460 | } | |
262965f5 | 461 | |
24c5684b TM |
462 | if (base < xdr->head[0].iov_len || addr != NULL) { |
463 | unsigned int len = xdr->head[0].iov_len - base; | |
464 | remainder -= len; | |
465 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
466 | if (remainder == 0 || err != len) | |
a246b010 | 467 | goto out; |
24c5684b | 468 | sent += err; |
a246b010 CL |
469 | base = 0; |
470 | } else | |
24c5684b | 471 | base -= xdr->head[0].iov_len; |
a246b010 | 472 | |
24c5684b TM |
473 | if (base < xdr->page_len) { |
474 | unsigned int len = xdr->page_len - base; | |
475 | remainder -= len; | |
a6b31d18 | 476 | err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy); |
24c5684b | 477 | if (remainder == 0 || err != len) |
a246b010 | 478 | goto out; |
24c5684b | 479 | sent += err; |
a246b010 | 480 | base = 0; |
24c5684b TM |
481 | } else |
482 | base -= xdr->page_len; | |
483 | ||
484 | if (base >= xdr->tail[0].iov_len) | |
485 | return sent; | |
486 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 487 | out: |
24c5684b TM |
488 | if (sent == 0) |
489 | return err; | |
490 | if (err > 0) | |
491 | sent += err; | |
492 | return sent; | |
a246b010 CL |
493 | } |
494 | ||
b6ddf64f TM |
495 | static void xs_nospace_callback(struct rpc_task *task) |
496 | { | |
497 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
498 | ||
499 | transport->inet->sk_write_pending--; | |
500 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
501 | } | |
502 | ||
9903cd1c | 503 | /** |
262965f5 CL |
504 | * xs_nospace - place task on wait queue if transmit was incomplete |
505 | * @task: task to put to sleep | |
9903cd1c | 506 | * |
a246b010 | 507 | */ |
5e3771ce | 508 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 509 | { |
262965f5 CL |
510 | struct rpc_rqst *req = task->tk_rqstp; |
511 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 512 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
06ea0bfe | 513 | struct sock *sk = transport->inet; |
24ca9a84 | 514 | int ret = -EAGAIN; |
a246b010 | 515 | |
46121cf7 | 516 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
517 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
518 | req->rq_slen); | |
519 | ||
b6ddf64f TM |
520 | /* Protect against races with write_space */ |
521 | spin_lock_bh(&xprt->transport_lock); | |
522 | ||
523 | /* Don't race with disconnect */ | |
524 | if (xprt_connected(xprt)) { | |
525 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
526 | /* | |
527 | * Notify TCP that we're limited by the application | |
528 | * window size | |
529 | */ | |
530 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
06ea0bfe | 531 | sk->sk_write_pending++; |
b6ddf64f TM |
532 | /* ...and wait for more buffer space */ |
533 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
534 | } | |
535 | } else { | |
536 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 537 | ret = -ENOTCONN; |
b6ddf64f | 538 | } |
262965f5 | 539 | |
b6ddf64f | 540 | spin_unlock_bh(&xprt->transport_lock); |
06ea0bfe TM |
541 | |
542 | /* Race breaker in case memory is freed before above code is called */ | |
543 | sk->sk_write_space(sk); | |
5e3771ce | 544 | return ret; |
262965f5 CL |
545 | } |
546 | ||
61677eee CL |
547 | /* |
548 | * Construct a stream transport record marker in @buf. | |
549 | */ | |
550 | static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) | |
551 | { | |
552 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
553 | rpc_fraghdr *base = buf->head[0].iov_base; | |
554 | *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); | |
555 | } | |
556 | ||
176e21ee CL |
557 | /** |
558 | * xs_local_send_request - write an RPC request to an AF_LOCAL socket | |
559 | * @task: RPC task that manages the state of an RPC request | |
560 | * | |
561 | * Return values: | |
562 | * 0: The request has been sent | |
563 | * EAGAIN: The socket was blocked, please call again later to | |
564 | * complete the request | |
565 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
566 | * other: Some other error occured, the request was not sent | |
567 | */ | |
568 | static int xs_local_send_request(struct rpc_task *task) | |
569 | { | |
570 | struct rpc_rqst *req = task->tk_rqstp; | |
571 | struct rpc_xprt *xprt = req->rq_xprt; | |
572 | struct sock_xprt *transport = | |
573 | container_of(xprt, struct sock_xprt, xprt); | |
574 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
575 | int status; | |
576 | ||
577 | xs_encode_stream_record_marker(&req->rq_snd_buf); | |
578 | ||
579 | xs_pktdump("packet data:", | |
580 | req->rq_svec->iov_base, req->rq_svec->iov_len); | |
581 | ||
582 | status = xs_sendpages(transport->sock, NULL, 0, | |
a6b31d18 | 583 | xdr, req->rq_bytes_sent, true); |
176e21ee CL |
584 | dprintk("RPC: %s(%u) = %d\n", |
585 | __func__, xdr->len - req->rq_bytes_sent, status); | |
586 | if (likely(status >= 0)) { | |
587 | req->rq_bytes_sent += status; | |
588 | req->rq_xmit_bytes_sent += status; | |
589 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { | |
590 | req->rq_bytes_sent = 0; | |
591 | return 0; | |
592 | } | |
593 | status = -EAGAIN; | |
594 | } | |
595 | ||
596 | switch (status) { | |
597 | case -EAGAIN: | |
598 | status = xs_nospace(task); | |
599 | break; | |
600 | default: | |
601 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
602 | -status); | |
603 | case -EPIPE: | |
604 | xs_close(xprt); | |
605 | status = -ENOTCONN; | |
606 | } | |
607 | ||
608 | return status; | |
609 | } | |
610 | ||
262965f5 CL |
611 | /** |
612 | * xs_udp_send_request - write an RPC request to a UDP socket | |
613 | * @task: address of RPC task that manages the state of an RPC request | |
614 | * | |
615 | * Return values: | |
616 | * 0: The request has been sent | |
617 | * EAGAIN: The socket was blocked, please call again later to | |
618 | * complete the request | |
619 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 620 | * other: Some other error occurred, the request was not sent |
262965f5 CL |
621 | */ |
622 | static int xs_udp_send_request(struct rpc_task *task) | |
623 | { | |
624 | struct rpc_rqst *req = task->tk_rqstp; | |
625 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 626 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
627 | struct xdr_buf *xdr = &req->rq_snd_buf; |
628 | int status; | |
a246b010 | 629 | |
9903cd1c | 630 | xs_pktdump("packet data:", |
a246b010 CL |
631 | req->rq_svec->iov_base, |
632 | req->rq_svec->iov_len); | |
633 | ||
01d37c42 TM |
634 | if (!xprt_bound(xprt)) |
635 | return -ENOTCONN; | |
ee0ac0c2 | 636 | status = xs_sendpages(transport->sock, |
95392c59 | 637 | xs_addr(xprt), |
ee0ac0c2 | 638 | xprt->addrlen, xdr, |
a6b31d18 | 639 | req->rq_bytes_sent, true); |
a246b010 | 640 | |
46121cf7 | 641 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 642 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 643 | |
2199700f | 644 | if (status >= 0) { |
d60dbb20 | 645 | req->rq_xmit_bytes_sent += status; |
2199700f TM |
646 | if (status >= req->rq_slen) |
647 | return 0; | |
648 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 649 | status = -EAGAIN; |
2199700f | 650 | } |
a246b010 | 651 | |
262965f5 | 652 | switch (status) { |
fba91afb TM |
653 | case -ENOTSOCK: |
654 | status = -ENOTCONN; | |
655 | /* Should we call xs_close() here? */ | |
656 | break; | |
b6ddf64f | 657 | case -EAGAIN: |
5e3771ce | 658 | status = xs_nospace(task); |
b6ddf64f | 659 | break; |
c8485e4d TM |
660 | default: |
661 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
662 | -status); | |
262965f5 CL |
663 | case -ENETUNREACH: |
664 | case -EPIPE: | |
a246b010 CL |
665 | case -ECONNREFUSED: |
666 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 667 | * prompts ECONNREFUSED. */ |
b6ddf64f | 668 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 669 | } |
5fe46e9d | 670 | |
262965f5 | 671 | return status; |
a246b010 CL |
672 | } |
673 | ||
e06799f9 TM |
674 | /** |
675 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
676 | * @xprt: transport | |
677 | * | |
678 | * Initiates a graceful shutdown of the TCP socket by calling the | |
679 | * equivalent of shutdown(SHUT_WR); | |
680 | */ | |
681 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
682 | { | |
683 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
684 | struct socket *sock = transport->sock; | |
685 | ||
40b5ea0c | 686 | if (sock != NULL) { |
e06799f9 | 687 | kernel_sock_shutdown(sock, SHUT_WR); |
40b5ea0c TM |
688 | trace_rpc_socket_shutdown(xprt, sock); |
689 | } | |
e06799f9 TM |
690 | } |
691 | ||
9903cd1c | 692 | /** |
262965f5 | 693 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
694 | * @task: address of RPC task that manages the state of an RPC request |
695 | * | |
696 | * Return values: | |
262965f5 CL |
697 | * 0: The request has been sent |
698 | * EAGAIN: The socket was blocked, please call again later to | |
699 | * complete the request | |
700 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 701 | * other: Some other error occurred, the request was not sent |
9903cd1c CL |
702 | * |
703 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 704 | * if sendmsg is not able to make progress? |
9903cd1c | 705 | */ |
262965f5 | 706 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
707 | { |
708 | struct rpc_rqst *req = task->tk_rqstp; | |
709 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 710 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 711 | struct xdr_buf *xdr = &req->rq_snd_buf; |
a6b31d18 | 712 | bool zerocopy = true; |
b595bb15 | 713 | int status; |
a246b010 | 714 | |
61677eee | 715 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
a246b010 | 716 | |
262965f5 CL |
717 | xs_pktdump("packet data:", |
718 | req->rq_svec->iov_base, | |
719 | req->rq_svec->iov_len); | |
a6b31d18 TM |
720 | /* Don't use zero copy if this is a resend. If the RPC call |
721 | * completes while the socket holds a reference to the pages, | |
722 | * then we may end up resending corrupted data. | |
723 | */ | |
724 | if (task->tk_flags & RPC_TASK_SENT) | |
725 | zerocopy = false; | |
a246b010 CL |
726 | |
727 | /* Continue transmitting the packet/record. We must be careful | |
728 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 729 | * called sendmsg(). */ |
a246b010 | 730 | while (1) { |
ee0ac0c2 | 731 | status = xs_sendpages(transport->sock, |
a6b31d18 TM |
732 | NULL, 0, xdr, req->rq_bytes_sent, |
733 | zerocopy); | |
a246b010 | 734 | |
46121cf7 | 735 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 736 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 737 | |
262965f5 | 738 | if (unlikely(status < 0)) |
a246b010 | 739 | break; |
a246b010 | 740 | |
262965f5 CL |
741 | /* If we've sent the entire packet, immediately |
742 | * reset the count of bytes sent. */ | |
743 | req->rq_bytes_sent += status; | |
d60dbb20 | 744 | req->rq_xmit_bytes_sent += status; |
262965f5 CL |
745 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
746 | req->rq_bytes_sent = 0; | |
747 | return 0; | |
748 | } | |
a246b010 | 749 | |
06b4b681 TM |
750 | if (status != 0) |
751 | continue; | |
a246b010 | 752 | status = -EAGAIN; |
06b4b681 | 753 | break; |
a246b010 CL |
754 | } |
755 | ||
262965f5 | 756 | switch (status) { |
fba91afb TM |
757 | case -ENOTSOCK: |
758 | status = -ENOTCONN; | |
759 | /* Should we call xs_close() here? */ | |
760 | break; | |
262965f5 | 761 | case -EAGAIN: |
5e3771ce | 762 | status = xs_nospace(task); |
262965f5 | 763 | break; |
c8485e4d TM |
764 | default: |
765 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
766 | -status); | |
262965f5 | 767 | case -ECONNRESET: |
2a9e1cfa TM |
768 | xs_tcp_shutdown(xprt); |
769 | case -ECONNREFUSED: | |
262965f5 | 770 | case -ENOTCONN: |
b9d2bb2e | 771 | case -EPIPE: |
b6ddf64f | 772 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 773 | } |
5fe46e9d | 774 | |
a246b010 CL |
775 | return status; |
776 | } | |
777 | ||
e0ab53de TM |
778 | /** |
779 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
780 | * @xprt: transport | |
781 | * @task: rpc task | |
782 | * | |
783 | * This cleans up if an error causes us to abort the transmission of a request. | |
784 | * In this case, the socket may need to be reset in order to avoid confusing | |
785 | * the server. | |
786 | */ | |
787 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
788 | { | |
789 | struct rpc_rqst *req; | |
790 | ||
791 | if (task != xprt->snd_task) | |
792 | return; | |
793 | if (task == NULL) | |
794 | goto out_release; | |
795 | req = task->tk_rqstp; | |
43cedbf0 TM |
796 | if (req == NULL) |
797 | goto out_release; | |
e0ab53de TM |
798 | if (req->rq_bytes_sent == 0) |
799 | goto out_release; | |
800 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
801 | goto out_release; | |
a4f0835c | 802 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
e0ab53de TM |
803 | out_release: |
804 | xprt_release_xprt(xprt, task); | |
805 | } | |
806 | ||
2a9e1cfa TM |
807 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
808 | { | |
809 | transport->old_data_ready = sk->sk_data_ready; | |
810 | transport->old_state_change = sk->sk_state_change; | |
811 | transport->old_write_space = sk->sk_write_space; | |
2118071d | 812 | transport->old_error_report = sk->sk_error_report; |
2a9e1cfa TM |
813 | } |
814 | ||
815 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
816 | { | |
817 | sk->sk_data_ready = transport->old_data_ready; | |
818 | sk->sk_state_change = transport->old_state_change; | |
819 | sk->sk_write_space = transport->old_write_space; | |
2118071d TM |
820 | sk->sk_error_report = transport->old_error_report; |
821 | } | |
822 | ||
823 | /** | |
824 | * xs_error_report - callback to handle TCP socket state errors | |
825 | * @sk: socket | |
826 | * | |
827 | * Note: we don't call sock_error() since there may be a rpc_task | |
828 | * using the socket, and so we don't want to clear sk->sk_err. | |
829 | */ | |
830 | static void xs_error_report(struct sock *sk) | |
831 | { | |
832 | struct rpc_xprt *xprt; | |
833 | int err; | |
834 | ||
835 | read_lock_bh(&sk->sk_callback_lock); | |
836 | if (!(xprt = xprt_from_sock(sk))) | |
837 | goto out; | |
838 | ||
839 | err = -sk->sk_err; | |
840 | if (err == 0) | |
841 | goto out; | |
842 | dprintk("RPC: xs_error_report client %p, error=%d...\n", | |
843 | xprt, -err); | |
e8353c76 | 844 | trace_rpc_socket_error(xprt, sk->sk_socket, err); |
2118071d TM |
845 | xprt_wake_pending_tasks(xprt, err); |
846 | out: | |
847 | read_unlock_bh(&sk->sk_callback_lock); | |
2a9e1cfa TM |
848 | } |
849 | ||
fe315e76 | 850 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 851 | { |
ee0ac0c2 CL |
852 | struct socket *sock = transport->sock; |
853 | struct sock *sk = transport->inet; | |
a246b010 | 854 | |
fe315e76 CL |
855 | if (sk == NULL) |
856 | return; | |
9903cd1c | 857 | |
246408dc TM |
858 | transport->srcport = 0; |
859 | ||
a246b010 | 860 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
861 | transport->inet = NULL; |
862 | transport->sock = NULL; | |
a246b010 | 863 | |
9903cd1c | 864 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
865 | |
866 | xs_restore_old_callbacks(transport, sk); | |
a246b010 CL |
867 | write_unlock_bh(&sk->sk_callback_lock); |
868 | ||
9903cd1c | 869 | sk->sk_no_check = 0; |
a246b010 | 870 | |
40b5ea0c | 871 | trace_rpc_socket_close(&transport->xprt, sock); |
a246b010 | 872 | sock_release(sock); |
fe315e76 CL |
873 | } |
874 | ||
875 | /** | |
876 | * xs_close - close a socket | |
877 | * @xprt: transport | |
878 | * | |
879 | * This is used when all requests are complete; ie, no DRC state remains | |
880 | * on the server we want to save. | |
f75e6745 TM |
881 | * |
882 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
883 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
884 | */ |
885 | static void xs_close(struct rpc_xprt *xprt) | |
886 | { | |
887 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
888 | ||
889 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
890 | ||
93dc41bd N |
891 | cancel_delayed_work_sync(&transport->connect_worker); |
892 | ||
fe315e76 | 893 | xs_reset_transport(transport); |
61d0a8e6 | 894 | xprt->reestablish_timeout = 0; |
fe315e76 | 895 | |
632e3bdc | 896 | smp_mb__before_clear_bit(); |
7d1e8255 | 897 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
632e3bdc | 898 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 899 | clear_bit(XPRT_CLOSING, &xprt->state); |
632e3bdc | 900 | smp_mb__after_clear_bit(); |
62da3b24 | 901 | xprt_disconnect_done(xprt); |
a246b010 CL |
902 | } |
903 | ||
f75e6745 TM |
904 | static void xs_tcp_close(struct rpc_xprt *xprt) |
905 | { | |
906 | if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) | |
907 | xs_close(xprt); | |
908 | else | |
909 | xs_tcp_shutdown(xprt); | |
910 | } | |
911 | ||
9903cd1c CL |
912 | /** |
913 | * xs_destroy - prepare to shutdown a transport | |
914 | * @xprt: doomed transport | |
915 | * | |
916 | */ | |
917 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 918 | { |
46121cf7 | 919 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 920 | |
a1311d87 TM |
921 | xs_close(xprt); |
922 | xs_free_peer_addresses(xprt); | |
923 | xprt_free(xprt); | |
924 | module_put(THIS_MODULE); | |
a246b010 CL |
925 | } |
926 | ||
176e21ee CL |
927 | static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) |
928 | { | |
929 | struct xdr_skb_reader desc = { | |
930 | .skb = skb, | |
931 | .offset = sizeof(rpc_fraghdr), | |
932 | .count = skb->len - sizeof(rpc_fraghdr), | |
933 | }; | |
934 | ||
935 | if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) | |
936 | return -1; | |
937 | if (desc.count) | |
938 | return -1; | |
939 | return 0; | |
940 | } | |
941 | ||
942 | /** | |
943 | * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets | |
944 | * @sk: socket with data to read | |
945 | * @len: how much data to read | |
946 | * | |
947 | * Currently this assumes we can read the whole reply in a single gulp. | |
948 | */ | |
949 | static void xs_local_data_ready(struct sock *sk, int len) | |
950 | { | |
951 | struct rpc_task *task; | |
952 | struct rpc_xprt *xprt; | |
953 | struct rpc_rqst *rovr; | |
954 | struct sk_buff *skb; | |
955 | int err, repsize, copied; | |
956 | u32 _xid; | |
957 | __be32 *xp; | |
958 | ||
959 | read_lock_bh(&sk->sk_callback_lock); | |
960 | dprintk("RPC: %s...\n", __func__); | |
961 | xprt = xprt_from_sock(sk); | |
962 | if (xprt == NULL) | |
963 | goto out; | |
964 | ||
965 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
966 | if (skb == NULL) | |
967 | goto out; | |
968 | ||
176e21ee CL |
969 | repsize = skb->len - sizeof(rpc_fraghdr); |
970 | if (repsize < 4) { | |
971 | dprintk("RPC: impossible RPC reply size %d\n", repsize); | |
972 | goto dropit; | |
973 | } | |
974 | ||
975 | /* Copy the XID from the skb... */ | |
976 | xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); | |
977 | if (xp == NULL) | |
978 | goto dropit; | |
979 | ||
980 | /* Look up and lock the request corresponding to the given XID */ | |
981 | spin_lock(&xprt->transport_lock); | |
982 | rovr = xprt_lookup_rqst(xprt, *xp); | |
983 | if (!rovr) | |
984 | goto out_unlock; | |
985 | task = rovr->rq_task; | |
986 | ||
987 | copied = rovr->rq_private_buf.buflen; | |
988 | if (copied > repsize) | |
989 | copied = repsize; | |
990 | ||
991 | if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { | |
992 | dprintk("RPC: sk_buff copy failed\n"); | |
993 | goto out_unlock; | |
994 | } | |
995 | ||
996 | xprt_complete_rqst(task, copied); | |
997 | ||
998 | out_unlock: | |
999 | spin_unlock(&xprt->transport_lock); | |
1000 | dropit: | |
1001 | skb_free_datagram(sk, skb); | |
1002 | out: | |
1003 | read_unlock_bh(&sk->sk_callback_lock); | |
1004 | } | |
1005 | ||
9903cd1c CL |
1006 | /** |
1007 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
1008 | * @sk: socket with data to read | |
1009 | * @len: how much data to read | |
1010 | * | |
a246b010 | 1011 | */ |
9903cd1c | 1012 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 1013 | { |
9903cd1c CL |
1014 | struct rpc_task *task; |
1015 | struct rpc_xprt *xprt; | |
a246b010 | 1016 | struct rpc_rqst *rovr; |
9903cd1c | 1017 | struct sk_buff *skb; |
a246b010 | 1018 | int err, repsize, copied; |
d8ed029d AD |
1019 | u32 _xid; |
1020 | __be32 *xp; | |
a246b010 | 1021 | |
f064af1e | 1022 | read_lock_bh(&sk->sk_callback_lock); |
46121cf7 | 1023 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 1024 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1025 | goto out; |
a246b010 CL |
1026 | |
1027 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
1028 | goto out; | |
1029 | ||
a246b010 CL |
1030 | repsize = skb->len - sizeof(struct udphdr); |
1031 | if (repsize < 4) { | |
46121cf7 | 1032 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
1033 | goto dropit; |
1034 | } | |
1035 | ||
1036 | /* Copy the XID from the skb... */ | |
1037 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
1038 | sizeof(_xid), &_xid); | |
1039 | if (xp == NULL) | |
1040 | goto dropit; | |
1041 | ||
1042 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 1043 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
1044 | rovr = xprt_lookup_rqst(xprt, *xp); |
1045 | if (!rovr) | |
1046 | goto out_unlock; | |
1047 | task = rovr->rq_task; | |
1048 | ||
a246b010 CL |
1049 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
1050 | copied = repsize; | |
1051 | ||
1052 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
1053 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
1054 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 1055 | goto out_unlock; |
1781f7f5 HX |
1056 | } |
1057 | ||
1058 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 | 1059 | |
6a24dfb6 | 1060 | xprt_adjust_cwnd(xprt, task, copied); |
1570c1e4 | 1061 | xprt_complete_rqst(task, copied); |
a246b010 CL |
1062 | |
1063 | out_unlock: | |
4a0f8c04 | 1064 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
1065 | dropit: |
1066 | skb_free_datagram(sk, skb); | |
1067 | out: | |
f064af1e | 1068 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1069 | } |
1070 | ||
a519fc7a TM |
1071 | /* |
1072 | * Helper function to force a TCP close if the server is sending | |
1073 | * junk and/or it has put us in CLOSE_WAIT | |
1074 | */ | |
1075 | static void xs_tcp_force_close(struct rpc_xprt *xprt) | |
1076 | { | |
1077 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
1078 | xprt_force_disconnect(xprt); | |
1079 | } | |
1080 | ||
dd456471 | 1081 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 1082 | { |
51971139 | 1083 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
1084 | size_t len, used; |
1085 | char *p; | |
1086 | ||
51971139 CL |
1087 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
1088 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 1089 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1090 | transport->tcp_offset += used; |
a246b010 CL |
1091 | if (used != len) |
1092 | return; | |
808012fb | 1093 | |
51971139 CL |
1094 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
1095 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 1096 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 1097 | else |
e136d092 | 1098 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 1099 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 1100 | |
e136d092 | 1101 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 1102 | transport->tcp_offset = 0; |
808012fb | 1103 | |
a246b010 | 1104 | /* Sanity check of the record length */ |
18dca02a | 1105 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 1106 | dprintk("RPC: invalid TCP record fragment length\n"); |
a519fc7a | 1107 | xs_tcp_force_close(xprt); |
9903cd1c | 1108 | return; |
a246b010 | 1109 | } |
46121cf7 | 1110 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 1111 | transport->tcp_reclen); |
a246b010 CL |
1112 | } |
1113 | ||
51971139 | 1114 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 1115 | { |
51971139 | 1116 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 1117 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 1118 | transport->tcp_offset = 0; |
e136d092 CL |
1119 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
1120 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1121 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 1122 | transport->tcp_copied = 0; |
a246b010 CL |
1123 | } |
1124 | } | |
1125 | } | |
1126 | ||
dd456471 | 1127 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1128 | { |
1129 | size_t len, used; | |
1130 | char *p; | |
1131 | ||
51971139 | 1132 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 1133 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 1134 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 1135 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1136 | transport->tcp_offset += used; |
a246b010 CL |
1137 | if (used != len) |
1138 | return; | |
e136d092 | 1139 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 1140 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 1141 | transport->tcp_copied = 4; |
18dca02a RL |
1142 | dprintk("RPC: reading %s XID %08x\n", |
1143 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
1144 | : "request with", | |
51971139 CL |
1145 | ntohl(transport->tcp_xid)); |
1146 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
1147 | } |
1148 | ||
18dca02a RL |
1149 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1150 | struct xdr_skb_reader *desc) | |
a246b010 | 1151 | { |
18dca02a RL |
1152 | size_t len, used; |
1153 | u32 offset; | |
b76ce561 | 1154 | char *p; |
18dca02a RL |
1155 | |
1156 | /* | |
1157 | * We want transport->tcp_offset to be 8 at the end of this routine | |
1158 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
1159 | * When this function is called for the first time, | |
1160 | * transport->tcp_offset is 4 (after having already read the xid). | |
1161 | */ | |
1162 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
b76ce561 | 1163 | len = sizeof(transport->tcp_calldir) - offset; |
18dca02a | 1164 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
b76ce561 TM |
1165 | p = ((char *) &transport->tcp_calldir) + offset; |
1166 | used = xdr_skb_read_bits(desc, p, len); | |
18dca02a RL |
1167 | transport->tcp_offset += used; |
1168 | if (used != len) | |
1169 | return; | |
f4a2e418 | 1170 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
f4a2e418 RL |
1171 | /* |
1172 | * We don't yet have the XDR buffer, so we will write the calldir | |
1173 | * out after we get the buffer from the 'struct rpc_rqst' | |
1174 | */ | |
b76ce561 TM |
1175 | switch (ntohl(transport->tcp_calldir)) { |
1176 | case RPC_REPLY: | |
1177 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1178 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1179 | transport->tcp_flags |= TCP_RPC_REPLY; |
b76ce561 TM |
1180 | break; |
1181 | case RPC_CALL: | |
1182 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1183 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1184 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
b76ce561 TM |
1185 | break; |
1186 | default: | |
1187 | dprintk("RPC: invalid request message type\n"); | |
a519fc7a | 1188 | xs_tcp_force_close(&transport->xprt); |
b76ce561 | 1189 | } |
18dca02a RL |
1190 | xs_tcp_check_fraghdr(transport); |
1191 | } | |
1192 | ||
44b98efd RL |
1193 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1194 | struct xdr_skb_reader *desc, | |
1195 | struct rpc_rqst *req) | |
a246b010 | 1196 | { |
44b98efd RL |
1197 | struct sock_xprt *transport = |
1198 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1199 | struct xdr_buf *rcvbuf; |
1200 | size_t len; | |
1201 | ssize_t r; | |
1202 | ||
a246b010 | 1203 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1204 | |
1205 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1206 | /* | |
1207 | * Save the RPC direction in the XDR buffer | |
1208 | */ | |
f4a2e418 | 1209 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
b76ce561 TM |
1210 | &transport->tcp_calldir, |
1211 | sizeof(transport->tcp_calldir)); | |
1212 | transport->tcp_copied += sizeof(transport->tcp_calldir); | |
f4a2e418 | 1213 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
a246b010 CL |
1214 | } |
1215 | ||
a246b010 | 1216 | len = desc->count; |
51971139 | 1217 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1218 | struct xdr_skb_reader my_desc; |
a246b010 | 1219 | |
51971139 | 1220 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1221 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1222 | my_desc.count = len; | |
51971139 | 1223 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1224 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1225 | desc->count -= r; |
1226 | desc->offset += r; | |
1227 | } else | |
51971139 | 1228 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1229 | desc, xdr_skb_read_bits); |
a246b010 CL |
1230 | |
1231 | if (r > 0) { | |
51971139 CL |
1232 | transport->tcp_copied += r; |
1233 | transport->tcp_offset += r; | |
a246b010 CL |
1234 | } |
1235 | if (r != len) { | |
1236 | /* Error when copying to the receive buffer, | |
1237 | * usually because we weren't able to allocate | |
1238 | * additional buffer pages. All we can do now | |
e136d092 | 1239 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1240 | * will not receive any additional updates, |
1241 | * and time out. | |
1242 | * Any remaining data from this record will | |
1243 | * be discarded. | |
1244 | */ | |
e136d092 | 1245 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1246 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1247 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1248 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1249 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1250 | xprt, transport->tcp_copied, | |
1251 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1252 | return; |
a246b010 CL |
1253 | } |
1254 | ||
46121cf7 | 1255 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1256 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1257 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1258 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1259 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1260 | |
1261 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1262 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1263 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1264 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1265 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 | 1266 | } |
44b98efd RL |
1267 | } |
1268 | ||
1269 | /* | |
1270 | * Finds the request corresponding to the RPC xid and invokes the common | |
1271 | * tcp read code to read the data. | |
1272 | */ | |
1273 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1274 | struct xdr_skb_reader *desc) | |
1275 | { | |
1276 | struct sock_xprt *transport = | |
1277 | container_of(xprt, struct sock_xprt, xprt); | |
1278 | struct rpc_rqst *req; | |
1279 | ||
1280 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1281 | ||
1282 | /* Find and lock the request corresponding to this xid */ | |
1283 | spin_lock(&xprt->transport_lock); | |
1284 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1285 | if (!req) { | |
1286 | dprintk("RPC: XID %08x request not found!\n", | |
1287 | ntohl(transport->tcp_xid)); | |
1288 | spin_unlock(&xprt->transport_lock); | |
1289 | return -1; | |
1290 | } | |
1291 | ||
1292 | xs_tcp_read_common(xprt, desc, req); | |
1293 | ||
e136d092 | 1294 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1295 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1296 | |
4a0f8c04 | 1297 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1298 | return 0; |
1299 | } | |
1300 | ||
9e00abc3 | 1301 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
44b98efd RL |
1302 | /* |
1303 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1304 | * tcp read code to read the data. The result is placed in the callback | |
1305 | * queue. | |
1306 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1307 | * connection and return -1. | |
1308 | */ | |
1309 | static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, | |
1310 | struct xdr_skb_reader *desc) | |
1311 | { | |
1312 | struct sock_xprt *transport = | |
1313 | container_of(xprt, struct sock_xprt, xprt); | |
1314 | struct rpc_rqst *req; | |
1315 | ||
1316 | req = xprt_alloc_bc_request(xprt); | |
1317 | if (req == NULL) { | |
1318 | printk(KERN_WARNING "Callback slot table overflowed\n"); | |
1319 | xprt_force_disconnect(xprt); | |
1320 | return -1; | |
1321 | } | |
1322 | ||
1323 | req->rq_xid = transport->tcp_xid; | |
1324 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); | |
1325 | xs_tcp_read_common(xprt, desc, req); | |
1326 | ||
1327 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { | |
1328 | struct svc_serv *bc_serv = xprt->bc_serv; | |
1329 | ||
1330 | /* | |
1331 | * Add callback request to callback list. The callback | |
1332 | * service sleeps on the sv_cb_waitq waiting for new | |
1333 | * requests. Wake it up after adding enqueing the | |
1334 | * request. | |
1335 | */ | |
1336 | dprintk("RPC: add callback request to list\n"); | |
1337 | spin_lock(&bc_serv->sv_cb_lock); | |
1338 | list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); | |
1339 | spin_unlock(&bc_serv->sv_cb_lock); | |
1340 | wake_up(&bc_serv->sv_cb_waitq); | |
1341 | } | |
1342 | ||
1343 | req->rq_private_buf.len = transport->tcp_copied; | |
1344 | ||
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1349 | struct xdr_skb_reader *desc) | |
1350 | { | |
1351 | struct sock_xprt *transport = | |
1352 | container_of(xprt, struct sock_xprt, xprt); | |
1353 | ||
1354 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1355 | xs_tcp_read_reply(xprt, desc) : | |
1356 | xs_tcp_read_callback(xprt, desc); | |
1357 | } | |
1358 | #else | |
1359 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1360 | struct xdr_skb_reader *desc) | |
1361 | { | |
1362 | return xs_tcp_read_reply(xprt, desc); | |
1363 | } | |
9e00abc3 | 1364 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
44b98efd RL |
1365 | |
1366 | /* | |
1367 | * Read data off the transport. This can be either an RPC_CALL or an | |
1368 | * RPC_REPLY. Relay the processing to helper functions. | |
1369 | */ | |
1370 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1371 | struct xdr_skb_reader *desc) | |
1372 | { | |
1373 | struct sock_xprt *transport = | |
1374 | container_of(xprt, struct sock_xprt, xprt); | |
1375 | ||
1376 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1377 | xs_tcp_check_fraghdr(transport); | |
1378 | else { | |
1379 | /* | |
1380 | * The transport_lock protects the request handling. | |
1381 | * There's no need to hold it to update the tcp_flags. | |
1382 | */ | |
1383 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1384 | } | |
a246b010 CL |
1385 | } |
1386 | ||
dd456471 | 1387 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1388 | { |
1389 | size_t len; | |
1390 | ||
51971139 | 1391 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1392 | if (len > desc->count) |
1393 | len = desc->count; | |
1394 | desc->count -= len; | |
1395 | desc->offset += len; | |
51971139 | 1396 | transport->tcp_offset += len; |
46121cf7 | 1397 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1398 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1399 | } |
1400 | ||
9903cd1c | 1401 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1402 | { |
1403 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1404 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1405 | struct xdr_skb_reader desc = { |
a246b010 CL |
1406 | .skb = skb, |
1407 | .offset = offset, | |
1408 | .count = len, | |
9903cd1c | 1409 | }; |
a246b010 | 1410 | |
46121cf7 | 1411 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
1412 | do { |
1413 | /* Read in a new fragment marker if necessary */ | |
1414 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1415 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1416 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1417 | continue; |
1418 | } | |
1419 | /* Read in the xid if necessary */ | |
e136d092 | 1420 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1421 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1422 | continue; |
1423 | } | |
18dca02a | 1424 | /* Read in the call/reply flag */ |
f4a2e418 | 1425 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1426 | xs_tcp_read_calldir(transport, &desc); |
1427 | continue; | |
1428 | } | |
a246b010 | 1429 | /* Read in the request data */ |
e136d092 | 1430 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1431 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1432 | continue; |
1433 | } | |
1434 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1435 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1436 | } while (desc.count); |
46121cf7 | 1437 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1438 | return len - desc.count; |
1439 | } | |
1440 | ||
9903cd1c CL |
1441 | /** |
1442 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1443 | * @sk: socket with data to read | |
1444 | * @bytes: how much data to read | |
1445 | * | |
1446 | */ | |
1447 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1448 | { |
1449 | struct rpc_xprt *xprt; | |
1450 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1451 | int read; |
a246b010 | 1452 | |
46121cf7 CL |
1453 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1454 | ||
f064af1e | 1455 | read_lock_bh(&sk->sk_callback_lock); |
9903cd1c | 1456 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1457 | goto out; |
61d0a8e6 NB |
1458 | /* Any data means we had a useful conversation, so |
1459 | * the we don't need to delay the next reconnect | |
1460 | */ | |
1461 | if (xprt->reestablish_timeout) | |
1462 | xprt->reestablish_timeout = 0; | |
1463 | ||
9903cd1c | 1464 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1465 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1466 | do { |
1467 | rd_desc.count = 65536; | |
1468 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
1469 | } while (read > 0); | |
a246b010 | 1470 | out: |
f064af1e | 1471 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1472 | } |
1473 | ||
7d1e8255 TM |
1474 | /* |
1475 | * Do the equivalent of linger/linger2 handling for dealing with | |
1476 | * broken servers that don't close the socket in a timely | |
1477 | * fashion | |
1478 | */ | |
1479 | static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, | |
1480 | unsigned long timeout) | |
1481 | { | |
1482 | struct sock_xprt *transport; | |
1483 | ||
1484 | if (xprt_test_and_set_connecting(xprt)) | |
1485 | return; | |
1486 | set_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1487 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1488 | queue_delayed_work(rpciod_workqueue, &transport->connect_worker, | |
1489 | timeout); | |
1490 | } | |
1491 | ||
1492 | static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) | |
1493 | { | |
1494 | struct sock_xprt *transport; | |
1495 | ||
1496 | transport = container_of(xprt, struct sock_xprt, xprt); | |
1497 | ||
1498 | if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || | |
1499 | !cancel_delayed_work(&transport->connect_worker)) | |
1500 | return; | |
1501 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); | |
1502 | xprt_clear_connecting(xprt); | |
1503 | } | |
1504 | ||
4bc1e68e | 1505 | static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) |
7d1e8255 TM |
1506 | { |
1507 | smp_mb__before_clear_bit(); | |
a519fc7a TM |
1508 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1509 | clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); | |
7d1e8255 TM |
1510 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1511 | clear_bit(XPRT_CLOSING, &xprt->state); | |
1512 | smp_mb__after_clear_bit(); | |
4bc1e68e TM |
1513 | } |
1514 | ||
1515 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
1516 | { | |
1517 | xs_sock_reset_connection_flags(xprt); | |
7d1e8255 TM |
1518 | /* Mark transport as closed and wake up all pending tasks */ |
1519 | xprt_disconnect_done(xprt); | |
1520 | } | |
1521 | ||
9903cd1c CL |
1522 | /** |
1523 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1524 | * @sk: socket whose state has changed | |
1525 | * | |
1526 | */ | |
1527 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1528 | { |
9903cd1c | 1529 | struct rpc_xprt *xprt; |
a246b010 | 1530 | |
f064af1e | 1531 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1532 | if (!(xprt = xprt_from_sock(sk))) |
1533 | goto out; | |
46121cf7 | 1534 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
669502ff | 1535 | dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
46121cf7 CL |
1536 | sk->sk_state, xprt_connected(xprt), |
1537 | sock_flag(sk, SOCK_DEAD), | |
669502ff AC |
1538 | sock_flag(sk, SOCK_ZAPPED), |
1539 | sk->sk_shutdown); | |
a246b010 | 1540 | |
40b5ea0c | 1541 | trace_rpc_socket_state_change(xprt, sk->sk_socket); |
a246b010 CL |
1542 | switch (sk->sk_state) { |
1543 | case TCP_ESTABLISHED: | |
f064af1e | 1544 | spin_lock(&xprt->transport_lock); |
a246b010 | 1545 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1546 | struct sock_xprt *transport = container_of(xprt, |
1547 | struct sock_xprt, xprt); | |
1548 | ||
a246b010 | 1549 | /* Reset TCP record info */ |
51971139 CL |
1550 | transport->tcp_offset = 0; |
1551 | transport->tcp_reclen = 0; | |
1552 | transport->tcp_copied = 0; | |
e136d092 CL |
1553 | transport->tcp_flags = |
1554 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
8b71798c | 1555 | xprt->connect_cookie++; |
51971139 | 1556 | |
2a491991 | 1557 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1558 | } |
f064af1e | 1559 | spin_unlock(&xprt->transport_lock); |
a246b010 | 1560 | break; |
3b948ae5 TM |
1561 | case TCP_FIN_WAIT1: |
1562 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1563 | xprt->connect_cookie++; |
663b8858 | 1564 | xprt->reestablish_timeout = 0; |
3b948ae5 TM |
1565 | set_bit(XPRT_CLOSING, &xprt->state); |
1566 | smp_mb__before_clear_bit(); | |
1567 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
ef803670 | 1568 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
3b948ae5 | 1569 | smp_mb__after_clear_bit(); |
25fe6142 | 1570 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
a246b010 | 1571 | break; |
632e3bdc | 1572 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1573 | /* The server initiated a shutdown of the socket */ |
7c1d71cf | 1574 | xprt->connect_cookie++; |
d0bea455 | 1575 | clear_bit(XPRT_CONNECTED, &xprt->state); |
a519fc7a | 1576 | xs_tcp_force_close(xprt); |
663b8858 TM |
1577 | case TCP_CLOSING: |
1578 | /* | |
1579 | * If the server closed down the connection, make sure that | |
1580 | * we back off before reconnecting | |
1581 | */ | |
1582 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1583 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1584 | break; |
1585 | case TCP_LAST_ACK: | |
670f9457 | 1586 | set_bit(XPRT_CLOSING, &xprt->state); |
25fe6142 | 1587 | xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
3b948ae5 TM |
1588 | smp_mb__before_clear_bit(); |
1589 | clear_bit(XPRT_CONNECTED, &xprt->state); | |
1590 | smp_mb__after_clear_bit(); | |
1591 | break; | |
1592 | case TCP_CLOSE: | |
7d1e8255 TM |
1593 | xs_tcp_cancel_linger_timeout(xprt); |
1594 | xs_sock_mark_closed(xprt); | |
a246b010 CL |
1595 | } |
1596 | out: | |
f064af1e | 1597 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1598 | } |
1599 | ||
1f0fa154 IJ |
1600 | static void xs_write_space(struct sock *sk) |
1601 | { | |
1602 | struct socket *sock; | |
1603 | struct rpc_xprt *xprt; | |
1604 | ||
1605 | if (unlikely(!(sock = sk->sk_socket))) | |
1606 | return; | |
1607 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1608 | ||
1609 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1610 | return; | |
1611 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1612 | return; | |
1613 | ||
1614 | xprt_write_space(xprt); | |
1615 | } | |
1616 | ||
9903cd1c | 1617 | /** |
c7b2cae8 CL |
1618 | * xs_udp_write_space - callback invoked when socket buffer space |
1619 | * becomes available | |
9903cd1c CL |
1620 | * @sk: socket whose state has changed |
1621 | * | |
a246b010 CL |
1622 | * Called when more output buffer space is available for this socket. |
1623 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1624 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1625 | * with a bunch of small requests. |
1626 | */ | |
c7b2cae8 | 1627 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1628 | { |
f064af1e | 1629 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1630 | |
c7b2cae8 | 1631 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1632 | if (sock_writeable(sk)) |
1633 | xs_write_space(sk); | |
a246b010 | 1634 | |
f064af1e | 1635 | read_unlock_bh(&sk->sk_callback_lock); |
c7b2cae8 | 1636 | } |
a246b010 | 1637 | |
c7b2cae8 CL |
1638 | /** |
1639 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1640 | * becomes available | |
1641 | * @sk: socket whose state has changed | |
1642 | * | |
1643 | * Called when more output buffer space is available for this socket. | |
1644 | * We try not to wake our writers until they can make "significant" | |
1645 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1646 | * with a bunch of small requests. | |
1647 | */ | |
1648 | static void xs_tcp_write_space(struct sock *sk) | |
1649 | { | |
f064af1e | 1650 | read_lock_bh(&sk->sk_callback_lock); |
c7b2cae8 CL |
1651 | |
1652 | /* from net/core/stream.c:sk_stream_write_space */ | |
64dc6130 | 1653 | if (sk_stream_is_writeable(sk)) |
1f0fa154 | 1654 | xs_write_space(sk); |
b6ddf64f | 1655 | |
f064af1e | 1656 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1657 | } |
1658 | ||
470056c2 | 1659 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1660 | { |
ee0ac0c2 CL |
1661 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1662 | struct sock *sk = transport->inet; | |
a246b010 | 1663 | |
7c6e066e | 1664 | if (transport->rcvsize) { |
a246b010 | 1665 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1666 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1667 | } |
7c6e066e | 1668 | if (transport->sndsize) { |
a246b010 | 1669 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1670 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1671 | sk->sk_write_space(sk); |
1672 | } | |
1673 | } | |
1674 | ||
43118c29 | 1675 | /** |
470056c2 | 1676 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1677 | * @xprt: generic transport |
470056c2 CL |
1678 | * @sndsize: requested size of send buffer, in bytes |
1679 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1680 | * |
470056c2 | 1681 | * Set socket send and receive buffer size limits. |
43118c29 | 1682 | */ |
470056c2 | 1683 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1684 | { |
7c6e066e CL |
1685 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1686 | ||
1687 | transport->sndsize = 0; | |
470056c2 | 1688 | if (sndsize) |
7c6e066e CL |
1689 | transport->sndsize = sndsize + 1024; |
1690 | transport->rcvsize = 0; | |
470056c2 | 1691 | if (rcvsize) |
7c6e066e | 1692 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1693 | |
1694 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1695 | } |
1696 | ||
46c0ee8b CL |
1697 | /** |
1698 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1699 | * @task: task that timed out | |
1700 | * | |
1701 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1702 | */ | |
6a24dfb6 | 1703 | static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) |
46c0ee8b | 1704 | { |
6a24dfb6 | 1705 | xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); |
46c0ee8b CL |
1706 | } |
1707 | ||
b85d8806 CL |
1708 | static unsigned short xs_get_random_port(void) |
1709 | { | |
1710 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
63862b5b | 1711 | unsigned short rand = (unsigned short) prandom_u32() % range; |
b85d8806 CL |
1712 | return rand + xprt_min_resvport; |
1713 | } | |
1714 | ||
92200412 CL |
1715 | /** |
1716 | * xs_set_port - reset the port number in the remote endpoint address | |
1717 | * @xprt: generic transport | |
1718 | * @port: new port number | |
1719 | * | |
1720 | */ | |
1721 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1722 | { | |
46121cf7 | 1723 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1724 | |
9dc3b095 CL |
1725 | rpc_set_port(xs_addr(xprt), port); |
1726 | xs_update_peer_port(xprt); | |
92200412 CL |
1727 | } |
1728 | ||
5d4ec932 | 1729 | static unsigned short xs_get_srcport(struct sock_xprt *transport) |
67a391d7 | 1730 | { |
fbfffbd5 | 1731 | unsigned short port = transport->srcport; |
67a391d7 TM |
1732 | |
1733 | if (port == 0 && transport->xprt.resvport) | |
1734 | port = xs_get_random_port(); | |
1735 | return port; | |
1736 | } | |
1737 | ||
baaf4e48 | 1738 | static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
67a391d7 | 1739 | { |
fbfffbd5 CL |
1740 | if (transport->srcport != 0) |
1741 | transport->srcport = 0; | |
67a391d7 TM |
1742 | if (!transport->xprt.resvport) |
1743 | return 0; | |
1744 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1745 | return xprt_max_resvport; | |
1746 | return --port; | |
1747 | } | |
beb59b68 | 1748 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
a246b010 | 1749 | { |
beb59b68 | 1750 | struct sockaddr_storage myaddr; |
67a391d7 | 1751 | int err, nloop = 0; |
5d4ec932 | 1752 | unsigned short port = xs_get_srcport(transport); |
67a391d7 | 1753 | unsigned short last; |
a246b010 | 1754 | |
beb59b68 | 1755 | memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
a246b010 | 1756 | do { |
beb59b68 PE |
1757 | rpc_set_port((struct sockaddr *)&myaddr, port); |
1758 | err = kernel_bind(sock, (struct sockaddr *)&myaddr, | |
1759 | transport->xprt.addrlen); | |
67a391d7 | 1760 | if (port == 0) |
d3bc9a1d | 1761 | break; |
a246b010 | 1762 | if (err == 0) { |
fbfffbd5 | 1763 | transport->srcport = port; |
d3bc9a1d | 1764 | break; |
a246b010 | 1765 | } |
67a391d7 | 1766 | last = port; |
baaf4e48 | 1767 | port = xs_next_srcport(transport, port); |
67a391d7 TM |
1768 | if (port > last) |
1769 | nloop++; | |
1770 | } while (err == -EADDRINUSE && nloop != 2); | |
90058d37 | 1771 | |
4232e863 | 1772 | if (myaddr.ss_family == AF_INET) |
beb59b68 PE |
1773 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
1774 | &((struct sockaddr_in *)&myaddr)->sin_addr, | |
1775 | port, err ? "failed" : "ok", err); | |
1776 | else | |
1777 | dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, | |
1778 | &((struct sockaddr_in6 *)&myaddr)->sin6_addr, | |
1779 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1780 | return err; |
1781 | } | |
1782 | ||
176e21ee CL |
1783 | /* |
1784 | * We don't support autobind on AF_LOCAL sockets | |
1785 | */ | |
1786 | static void xs_local_rpcbind(struct rpc_task *task) | |
1787 | { | |
3dc0da27 TM |
1788 | rcu_read_lock(); |
1789 | xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); | |
1790 | rcu_read_unlock(); | |
176e21ee CL |
1791 | } |
1792 | ||
1793 | static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1794 | { | |
1795 | } | |
beb59b68 | 1796 | |
ed07536e PZ |
1797 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1798 | static struct lock_class_key xs_key[2]; | |
1799 | static struct lock_class_key xs_slock_key[2]; | |
1800 | ||
176e21ee CL |
1801 | static inline void xs_reclassify_socketu(struct socket *sock) |
1802 | { | |
1803 | struct sock *sk = sock->sk; | |
1804 | ||
176e21ee CL |
1805 | sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", |
1806 | &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); | |
1807 | } | |
1808 | ||
8945ee5e | 1809 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1810 | { |
1811 | struct sock *sk = sock->sk; | |
8945ee5e | 1812 | |
8945ee5e CL |
1813 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1814 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1815 | } | |
ed07536e | 1816 | |
8945ee5e CL |
1817 | static inline void xs_reclassify_socket6(struct socket *sock) |
1818 | { | |
1819 | struct sock *sk = sock->sk; | |
ed07536e | 1820 | |
8945ee5e CL |
1821 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1822 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e | 1823 | } |
6bc9638a PE |
1824 | |
1825 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1826 | { | |
1b7a1819 WAA |
1827 | WARN_ON_ONCE(sock_owned_by_user(sock->sk)); |
1828 | if (sock_owned_by_user(sock->sk)) | |
1829 | return; | |
1830 | ||
4232e863 | 1831 | switch (family) { |
176e21ee CL |
1832 | case AF_LOCAL: |
1833 | xs_reclassify_socketu(sock); | |
1834 | break; | |
4232e863 | 1835 | case AF_INET: |
6bc9638a | 1836 | xs_reclassify_socket4(sock); |
4232e863 CL |
1837 | break; |
1838 | case AF_INET6: | |
6bc9638a | 1839 | xs_reclassify_socket6(sock); |
4232e863 CL |
1840 | break; |
1841 | } | |
6bc9638a | 1842 | } |
ed07536e | 1843 | #else |
176e21ee CL |
1844 | static inline void xs_reclassify_socketu(struct socket *sock) |
1845 | { | |
1846 | } | |
1847 | ||
8945ee5e CL |
1848 | static inline void xs_reclassify_socket4(struct socket *sock) |
1849 | { | |
1850 | } | |
1851 | ||
1852 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1853 | { |
1854 | } | |
6bc9638a PE |
1855 | |
1856 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1857 | { | |
1858 | } | |
ed07536e PZ |
1859 | #endif |
1860 | ||
93dc41bd N |
1861 | static void xs_dummy_setup_socket(struct work_struct *work) |
1862 | { | |
1863 | } | |
1864 | ||
6bc9638a PE |
1865 | static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
1866 | struct sock_xprt *transport, int family, int type, int protocol) | |
22f79326 PE |
1867 | { |
1868 | struct socket *sock; | |
1869 | int err; | |
1870 | ||
6bc9638a | 1871 | err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
22f79326 PE |
1872 | if (err < 0) { |
1873 | dprintk("RPC: can't create %d transport socket (%d).\n", | |
1874 | protocol, -err); | |
1875 | goto out; | |
1876 | } | |
6bc9638a | 1877 | xs_reclassify_socket(family, sock); |
22f79326 | 1878 | |
4cea288a BH |
1879 | err = xs_bind(transport, sock); |
1880 | if (err) { | |
22f79326 PE |
1881 | sock_release(sock); |
1882 | goto out; | |
1883 | } | |
1884 | ||
1885 | return sock; | |
1886 | out: | |
1887 | return ERR_PTR(err); | |
1888 | } | |
1889 | ||
176e21ee CL |
1890 | static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
1891 | struct socket *sock) | |
1892 | { | |
1893 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1894 | xprt); | |
1895 | ||
1896 | if (!transport->inet) { | |
1897 | struct sock *sk = sock->sk; | |
1898 | ||
1899 | write_lock_bh(&sk->sk_callback_lock); | |
1900 | ||
1901 | xs_save_old_callbacks(transport, sk); | |
1902 | ||
1903 | sk->sk_user_data = xprt; | |
1904 | sk->sk_data_ready = xs_local_data_ready; | |
1905 | sk->sk_write_space = xs_udp_write_space; | |
2118071d | 1906 | sk->sk_error_report = xs_error_report; |
176e21ee CL |
1907 | sk->sk_allocation = GFP_ATOMIC; |
1908 | ||
1909 | xprt_clear_connected(xprt); | |
1910 | ||
1911 | /* Reset to new socket */ | |
1912 | transport->sock = sock; | |
1913 | transport->inet = sk; | |
1914 | ||
1915 | write_unlock_bh(&sk->sk_callback_lock); | |
1916 | } | |
1917 | ||
1918 | /* Tell the socket layer to start connecting... */ | |
1919 | xprt->stat.connect_count++; | |
1920 | xprt->stat.connect_start = jiffies; | |
1921 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); | |
1922 | } | |
1923 | ||
1924 | /** | |
1925 | * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint | |
1926 | * @xprt: RPC transport to connect | |
1927 | * @transport: socket transport to connect | |
1928 | * @create_sock: function to create a socket of the correct type | |
176e21ee | 1929 | */ |
dc107402 | 1930 | static int xs_local_setup_socket(struct sock_xprt *transport) |
176e21ee | 1931 | { |
176e21ee CL |
1932 | struct rpc_xprt *xprt = &transport->xprt; |
1933 | struct socket *sock; | |
1934 | int status = -EIO; | |
1935 | ||
5cf02d09 JL |
1936 | current->flags |= PF_FSTRANS; |
1937 | ||
176e21ee CL |
1938 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
1939 | status = __sock_create(xprt->xprt_net, AF_LOCAL, | |
1940 | SOCK_STREAM, 0, &sock, 1); | |
1941 | if (status < 0) { | |
1942 | dprintk("RPC: can't create AF_LOCAL " | |
1943 | "transport socket (%d).\n", -status); | |
1944 | goto out; | |
1945 | } | |
1946 | xs_reclassify_socketu(sock); | |
1947 | ||
1948 | dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", | |
1949 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1950 | ||
1951 | status = xs_local_finish_connecting(xprt, sock); | |
40b5ea0c | 1952 | trace_rpc_socket_connect(xprt, sock, status); |
176e21ee CL |
1953 | switch (status) { |
1954 | case 0: | |
1955 | dprintk("RPC: xprt %p connected to %s\n", | |
1956 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1957 | xprt_set_connected(xprt); | |
1958 | break; | |
1959 | case -ENOENT: | |
1960 | dprintk("RPC: xprt %p: socket %s does not exist\n", | |
1961 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1962 | break; | |
4a20a988 TM |
1963 | case -ECONNREFUSED: |
1964 | dprintk("RPC: xprt %p: connection refused for %s\n", | |
1965 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1966 | break; | |
176e21ee CL |
1967 | default: |
1968 | printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", | |
1969 | __func__, -status, | |
1970 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1971 | } | |
1972 | ||
1973 | out: | |
1974 | xprt_clear_connecting(xprt); | |
1975 | xprt_wake_pending_tasks(xprt, status); | |
5cf02d09 | 1976 | current->flags &= ~PF_FSTRANS; |
dc107402 BF |
1977 | return status; |
1978 | } | |
1979 | ||
b6669737 | 1980 | static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
dc107402 | 1981 | { |
dc107402 BF |
1982 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1983 | int ret; | |
1984 | ||
1985 | if (RPC_IS_ASYNC(task)) { | |
1986 | /* | |
1987 | * We want the AF_LOCAL connect to be resolved in the | |
1988 | * filesystem namespace of the process making the rpc | |
1989 | * call. Thus we connect synchronously. | |
1990 | * | |
1991 | * If we want to support asynchronous AF_LOCAL calls, | |
1992 | * we'll need to figure out how to pass a namespace to | |
1993 | * connect. | |
1994 | */ | |
1995 | rpc_exit(task, -ENOTCONN); | |
1996 | return; | |
1997 | } | |
1998 | ret = xs_local_setup_socket(transport); | |
1999 | if (ret && !RPC_IS_SOFTCONN(task)) | |
2000 | msleep_interruptible(15000); | |
176e21ee CL |
2001 | } |
2002 | ||
a564b8f0 MG |
2003 | #ifdef CONFIG_SUNRPC_SWAP |
2004 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
2005 | { | |
2006 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
2007 | xprt); | |
2008 | ||
2009 | if (xprt->swapper) | |
2010 | sk_set_memalloc(transport->inet); | |
2011 | } | |
2012 | ||
2013 | /** | |
2014 | * xs_swapper - Tag this transport as being used for swap. | |
2015 | * @xprt: transport to tag | |
2016 | * @enable: enable/disable | |
2017 | * | |
2018 | */ | |
2019 | int xs_swapper(struct rpc_xprt *xprt, int enable) | |
2020 | { | |
2021 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
2022 | xprt); | |
2023 | int err = 0; | |
2024 | ||
2025 | if (enable) { | |
2026 | xprt->swapper++; | |
2027 | xs_set_memalloc(xprt); | |
2028 | } else if (xprt->swapper) { | |
2029 | xprt->swapper--; | |
2030 | sk_clear_memalloc(transport->inet); | |
2031 | } | |
2032 | ||
2033 | return err; | |
2034 | } | |
2035 | EXPORT_SYMBOL_GPL(xs_swapper); | |
2036 | #else | |
2037 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
2038 | { | |
2039 | } | |
2040 | #endif | |
2041 | ||
16be2d20 CL |
2042 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
2043 | { | |
2044 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
2045 | ||
2046 | if (!transport->inet) { | |
2047 | struct sock *sk = sock->sk; | |
2048 | ||
2049 | write_lock_bh(&sk->sk_callback_lock); | |
2050 | ||
2a9e1cfa TM |
2051 | xs_save_old_callbacks(transport, sk); |
2052 | ||
16be2d20 | 2053 | sk->sk_user_data = xprt; |
16be2d20 CL |
2054 | sk->sk_data_ready = xs_udp_data_ready; |
2055 | sk->sk_write_space = xs_udp_write_space; | |
2056 | sk->sk_no_check = UDP_CSUM_NORCV; | |
2057 | sk->sk_allocation = GFP_ATOMIC; | |
2058 | ||
2059 | xprt_set_connected(xprt); | |
2060 | ||
2061 | /* Reset to new socket */ | |
2062 | transport->sock = sock; | |
2063 | transport->inet = sk; | |
2064 | ||
a564b8f0 MG |
2065 | xs_set_memalloc(xprt); |
2066 | ||
16be2d20 CL |
2067 | write_unlock_bh(&sk->sk_callback_lock); |
2068 | } | |
2069 | xs_udp_do_set_buffer_size(xprt); | |
2070 | } | |
2071 | ||
8c14ff2a | 2072 | static void xs_udp_setup_socket(struct work_struct *work) |
a246b010 | 2073 | { |
34161db6 TM |
2074 | struct sock_xprt *transport = |
2075 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 2076 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 2077 | struct socket *sock = transport->sock; |
b65c0310 | 2078 | int status = -EIO; |
9903cd1c | 2079 | |
5cf02d09 JL |
2080 | current->flags |= PF_FSTRANS; |
2081 | ||
b0d93ad5 | 2082 | /* Start by resetting any existing state */ |
fe315e76 | 2083 | xs_reset_transport(transport); |
8c14ff2a PE |
2084 | sock = xs_create_sock(xprt, transport, |
2085 | xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); | |
b65c0310 | 2086 | if (IS_ERR(sock)) |
b0d93ad5 | 2087 | goto out; |
68e220bd | 2088 | |
c740eff8 CL |
2089 | dprintk("RPC: worker connecting xprt %p via %s to " |
2090 | "%s (port %s)\n", xprt, | |
2091 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2092 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2093 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
2094 | |
2095 | xs_udp_finish_connecting(xprt, sock); | |
40b5ea0c | 2096 | trace_rpc_socket_connect(xprt, sock, 0); |
b0d93ad5 CL |
2097 | status = 0; |
2098 | out: | |
b0d93ad5 | 2099 | xprt_clear_connecting(xprt); |
7d1e8255 | 2100 | xprt_wake_pending_tasks(xprt, status); |
5cf02d09 | 2101 | current->flags &= ~PF_FSTRANS; |
a246b010 CL |
2102 | } |
2103 | ||
3167e12c CL |
2104 | /* |
2105 | * We need to preserve the port number so the reply cache on the server can | |
2106 | * find our cached RPC replies when we get around to reconnecting. | |
2107 | */ | |
58dddac9 | 2108 | static void xs_abort_connection(struct sock_xprt *transport) |
3167e12c CL |
2109 | { |
2110 | int result; | |
3167e12c CL |
2111 | struct sockaddr any; |
2112 | ||
58dddac9 | 2113 | dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); |
3167e12c CL |
2114 | |
2115 | /* | |
2116 | * Disconnect the transport socket by doing a connect operation | |
2117 | * with AF_UNSPEC. This should return immediately... | |
2118 | */ | |
2119 | memset(&any, 0, sizeof(any)); | |
2120 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 2121 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
40b5ea0c TM |
2122 | trace_rpc_socket_reset_connection(&transport->xprt, |
2123 | transport->sock, result); | |
7d1e8255 | 2124 | if (!result) |
4bc1e68e TM |
2125 | xs_sock_reset_connection_flags(&transport->xprt); |
2126 | dprintk("RPC: AF_UNSPEC connect return code %d\n", result); | |
3167e12c CL |
2127 | } |
2128 | ||
58dddac9 | 2129 | static void xs_tcp_reuse_connection(struct sock_xprt *transport) |
40d2549d TM |
2130 | { |
2131 | unsigned int state = transport->inet->sk_state; | |
2132 | ||
669502ff AC |
2133 | if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { |
2134 | /* we don't need to abort the connection if the socket | |
2135 | * hasn't undergone a shutdown | |
2136 | */ | |
2137 | if (transport->inet->sk_shutdown == 0) | |
2138 | return; | |
2139 | dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", | |
2140 | __func__, transport->inet->sk_shutdown); | |
2141 | } | |
2142 | if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { | |
2143 | /* we don't need to abort the connection if the socket | |
2144 | * hasn't undergone a shutdown | |
2145 | */ | |
2146 | if (transport->inet->sk_shutdown == 0) | |
2147 | return; | |
2148 | dprintk("RPC: %s: ESTABLISHED/SYN_SENT " | |
2149 | "sk_shutdown set to %d\n", | |
2150 | __func__, transport->inet->sk_shutdown); | |
2151 | } | |
58dddac9 | 2152 | xs_abort_connection(transport); |
40d2549d TM |
2153 | } |
2154 | ||
16be2d20 | 2155 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 2156 | { |
16be2d20 | 2157 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
fe19a96b | 2158 | int ret = -ENOTCONN; |
edb267a6 | 2159 | |
ee0ac0c2 | 2160 | if (!transport->inet) { |
b0d93ad5 | 2161 | struct sock *sk = sock->sk; |
7f260e85 TM |
2162 | unsigned int keepidle = xprt->timeout->to_initval / HZ; |
2163 | unsigned int keepcnt = xprt->timeout->to_retries + 1; | |
2164 | unsigned int opt_on = 1; | |
2165 | ||
2166 | /* TCP Keepalive options */ | |
2167 | kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, | |
2168 | (char *)&opt_on, sizeof(opt_on)); | |
2169 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, | |
2170 | (char *)&keepidle, sizeof(keepidle)); | |
2171 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, | |
2172 | (char *)&keepidle, sizeof(keepidle)); | |
2173 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, | |
2174 | (char *)&keepcnt, sizeof(keepcnt)); | |
b0d93ad5 CL |
2175 | |
2176 | write_lock_bh(&sk->sk_callback_lock); | |
2177 | ||
2a9e1cfa TM |
2178 | xs_save_old_callbacks(transport, sk); |
2179 | ||
b0d93ad5 | 2180 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
2181 | sk->sk_data_ready = xs_tcp_data_ready; |
2182 | sk->sk_state_change = xs_tcp_state_change; | |
2183 | sk->sk_write_space = xs_tcp_write_space; | |
2118071d | 2184 | sk->sk_error_report = xs_error_report; |
b079fa7b | 2185 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
2186 | |
2187 | /* socket options */ | |
2188 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
2189 | sock_reset_flag(sk, SOCK_LINGER); | |
2190 | tcp_sk(sk)->linger2 = 0; | |
2191 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
2192 | |
2193 | xprt_clear_connected(xprt); | |
2194 | ||
2195 | /* Reset to new socket */ | |
ee0ac0c2 CL |
2196 | transport->sock = sock; |
2197 | transport->inet = sk; | |
b0d93ad5 CL |
2198 | |
2199 | write_unlock_bh(&sk->sk_callback_lock); | |
2200 | } | |
2201 | ||
01d37c42 | 2202 | if (!xprt_bound(xprt)) |
fe19a96b | 2203 | goto out; |
01d37c42 | 2204 | |
a564b8f0 MG |
2205 | xs_set_memalloc(xprt); |
2206 | ||
b0d93ad5 | 2207 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
2208 | xprt->stat.connect_count++; |
2209 | xprt->stat.connect_start = jiffies; | |
fe19a96b TM |
2210 | ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
2211 | switch (ret) { | |
2212 | case 0: | |
2213 | case -EINPROGRESS: | |
2214 | /* SYN_SENT! */ | |
fe19a96b TM |
2215 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2216 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2217 | } | |
2218 | out: | |
2219 | return ret; | |
16be2d20 CL |
2220 | } |
2221 | ||
9903cd1c | 2222 | /** |
b61d59ff TM |
2223 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
2224 | * @xprt: RPC transport to connect | |
2225 | * @transport: socket transport to connect | |
2226 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
2227 | * |
2228 | * Invoked by a work queue tasklet. | |
a246b010 | 2229 | */ |
cdd518d5 | 2230 | static void xs_tcp_setup_socket(struct work_struct *work) |
a246b010 | 2231 | { |
cdd518d5 PE |
2232 | struct sock_xprt *transport = |
2233 | container_of(work, struct sock_xprt, connect_worker.work); | |
ee0ac0c2 | 2234 | struct socket *sock = transport->sock; |
a9f5f0f7 | 2235 | struct rpc_xprt *xprt = &transport->xprt; |
b61d59ff | 2236 | int status = -EIO; |
a246b010 | 2237 | |
5cf02d09 JL |
2238 | current->flags |= PF_FSTRANS; |
2239 | ||
ee0ac0c2 | 2240 | if (!sock) { |
7d1e8255 | 2241 | clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
cdd518d5 PE |
2242 | sock = xs_create_sock(xprt, transport, |
2243 | xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); | |
b61d59ff TM |
2244 | if (IS_ERR(sock)) { |
2245 | status = PTR_ERR(sock); | |
3167e12c CL |
2246 | goto out; |
2247 | } | |
7d1e8255 TM |
2248 | } else { |
2249 | int abort_and_exit; | |
a246b010 | 2250 | |
7d1e8255 TM |
2251 | abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
2252 | &xprt->state); | |
3167e12c | 2253 | /* "close" the socket, preserving the local port */ |
58dddac9 | 2254 | xs_tcp_reuse_connection(transport); |
a246b010 | 2255 | |
7d1e8255 TM |
2256 | if (abort_and_exit) |
2257 | goto out_eagain; | |
2258 | } | |
a246b010 | 2259 | |
c740eff8 CL |
2260 | dprintk("RPC: worker connecting xprt %p via %s to " |
2261 | "%s (port %s)\n", xprt, | |
2262 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2263 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2264 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 2265 | |
16be2d20 | 2266 | status = xs_tcp_finish_connecting(xprt, sock); |
40b5ea0c | 2267 | trace_rpc_socket_connect(xprt, sock, status); |
46121cf7 CL |
2268 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
2269 | xprt, -status, xprt_connected(xprt), | |
2270 | sock->sk->sk_state); | |
2a491991 | 2271 | switch (status) { |
f75e6745 TM |
2272 | default: |
2273 | printk("%s: connect returned unhandled error %d\n", | |
2274 | __func__, status); | |
2275 | case -EADDRNOTAVAIL: | |
2276 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
2277 | * and retry | |
2278 | */ | |
a519fc7a | 2279 | xs_tcp_force_close(xprt); |
88b5ed73 | 2280 | break; |
2a491991 TM |
2281 | case 0: |
2282 | case -EINPROGRESS: | |
2283 | case -EALREADY: | |
7d1e8255 | 2284 | xprt_clear_connecting(xprt); |
5cf02d09 | 2285 | current->flags &= ~PF_FSTRANS; |
7d1e8255 | 2286 | return; |
9fcfe0c8 TM |
2287 | case -EINVAL: |
2288 | /* Happens, for instance, if the user specified a link | |
2289 | * local IPv6 address without a scope-id. | |
2290 | */ | |
3ed5e2a2 TM |
2291 | case -ECONNREFUSED: |
2292 | case -ECONNRESET: | |
2293 | case -ENETUNREACH: | |
2294 | /* retry with existing socket, after a delay */ | |
9fcfe0c8 | 2295 | goto out; |
a246b010 | 2296 | } |
7d1e8255 | 2297 | out_eagain: |
2a491991 | 2298 | status = -EAGAIN; |
a246b010 | 2299 | out: |
68e220bd | 2300 | xprt_clear_connecting(xprt); |
7d1e8255 | 2301 | xprt_wake_pending_tasks(xprt, status); |
5cf02d09 | 2302 | current->flags &= ~PF_FSTRANS; |
68e220bd | 2303 | } |
b0d93ad5 | 2304 | |
9903cd1c CL |
2305 | /** |
2306 | * xs_connect - connect a socket to a remote endpoint | |
1b092092 | 2307 | * @xprt: pointer to transport structure |
9903cd1c CL |
2308 | * @task: address of RPC task that manages state of connect request |
2309 | * | |
2310 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2311 | * |
2312 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2313 | * to guarantee that even unprivileged user processes can set up a | |
2314 | * socket on a privileged port. | |
2315 | * | |
2316 | * If a UDP socket connect fails, the delay behavior here prevents | |
2317 | * retry floods (hard mounts). | |
9903cd1c | 2318 | */ |
1b092092 | 2319 | static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
a246b010 | 2320 | { |
ee0ac0c2 | 2321 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2322 | |
09a21c41 | 2323 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
46121cf7 CL |
2324 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2325 | "seconds\n", | |
03bf4b70 | 2326 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2327 | queue_delayed_work(rpciod_workqueue, |
2328 | &transport->connect_worker, | |
2329 | xprt->reestablish_timeout); | |
03bf4b70 | 2330 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2331 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2332 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2333 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2334 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2335 | } else { |
46121cf7 | 2336 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2337 | queue_delayed_work(rpciod_workqueue, |
2338 | &transport->connect_worker, 0); | |
a246b010 CL |
2339 | } |
2340 | } | |
2341 | ||
176e21ee CL |
2342 | /** |
2343 | * xs_local_print_stats - display AF_LOCAL socket-specifc stats | |
2344 | * @xprt: rpc_xprt struct containing statistics | |
2345 | * @seq: output file | |
2346 | * | |
2347 | */ | |
2348 | static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2349 | { | |
2350 | long idle_time = 0; | |
2351 | ||
2352 | if (xprt_connected(xprt)) | |
2353 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2354 | ||
2355 | seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " | |
15a45206 | 2356 | "%llu %llu %lu %llu %llu\n", |
176e21ee CL |
2357 | xprt->stat.bind_count, |
2358 | xprt->stat.connect_count, | |
2359 | xprt->stat.connect_time, | |
2360 | idle_time, | |
2361 | xprt->stat.sends, | |
2362 | xprt->stat.recvs, | |
2363 | xprt->stat.bad_xids, | |
2364 | xprt->stat.req_u, | |
15a45206 AA |
2365 | xprt->stat.bklog_u, |
2366 | xprt->stat.max_slots, | |
2367 | xprt->stat.sending_u, | |
2368 | xprt->stat.pending_u); | |
176e21ee CL |
2369 | } |
2370 | ||
262ca07d CL |
2371 | /** |
2372 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2373 | * @xprt: rpc_xprt struct containing statistics | |
2374 | * @seq: output file | |
2375 | * | |
2376 | */ | |
2377 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2378 | { | |
c8475461 CL |
2379 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2380 | ||
15a45206 AA |
2381 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " |
2382 | "%lu %llu %llu\n", | |
fbfffbd5 | 2383 | transport->srcport, |
262ca07d CL |
2384 | xprt->stat.bind_count, |
2385 | xprt->stat.sends, | |
2386 | xprt->stat.recvs, | |
2387 | xprt->stat.bad_xids, | |
2388 | xprt->stat.req_u, | |
15a45206 AA |
2389 | xprt->stat.bklog_u, |
2390 | xprt->stat.max_slots, | |
2391 | xprt->stat.sending_u, | |
2392 | xprt->stat.pending_u); | |
262ca07d CL |
2393 | } |
2394 | ||
2395 | /** | |
2396 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2397 | * @xprt: rpc_xprt struct containing statistics | |
2398 | * @seq: output file | |
2399 | * | |
2400 | */ | |
2401 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2402 | { | |
c8475461 | 2403 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2404 | long idle_time = 0; |
2405 | ||
2406 | if (xprt_connected(xprt)) | |
2407 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2408 | ||
15a45206 AA |
2409 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " |
2410 | "%llu %llu %lu %llu %llu\n", | |
fbfffbd5 | 2411 | transport->srcport, |
262ca07d CL |
2412 | xprt->stat.bind_count, |
2413 | xprt->stat.connect_count, | |
2414 | xprt->stat.connect_time, | |
2415 | idle_time, | |
2416 | xprt->stat.sends, | |
2417 | xprt->stat.recvs, | |
2418 | xprt->stat.bad_xids, | |
2419 | xprt->stat.req_u, | |
15a45206 AA |
2420 | xprt->stat.bklog_u, |
2421 | xprt->stat.max_slots, | |
2422 | xprt->stat.sending_u, | |
2423 | xprt->stat.pending_u); | |
262ca07d CL |
2424 | } |
2425 | ||
4cfc7e60 RI |
2426 | /* |
2427 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2428 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2429 | * to use the server side send routines. | |
2430 | */ | |
5a51f13a | 2431 | static void *bc_malloc(struct rpc_task *task, size_t size) |
4cfc7e60 RI |
2432 | { |
2433 | struct page *page; | |
2434 | struct rpc_buffer *buf; | |
2435 | ||
b8a13d03 WAA |
2436 | WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); |
2437 | if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) | |
2438 | return NULL; | |
4cfc7e60 | 2439 | |
b8a13d03 | 2440 | page = alloc_page(GFP_KERNEL); |
4cfc7e60 RI |
2441 | if (!page) |
2442 | return NULL; | |
2443 | ||
2444 | buf = page_address(page); | |
2445 | buf->len = PAGE_SIZE; | |
2446 | ||
2447 | return buf->data; | |
2448 | } | |
2449 | ||
2450 | /* | |
2451 | * Free the space allocated in the bc_alloc routine | |
2452 | */ | |
5a51f13a | 2453 | static void bc_free(void *buffer) |
4cfc7e60 RI |
2454 | { |
2455 | struct rpc_buffer *buf; | |
2456 | ||
2457 | if (!buffer) | |
2458 | return; | |
2459 | ||
2460 | buf = container_of(buffer, struct rpc_buffer, data); | |
2461 | free_page((unsigned long)buf); | |
2462 | } | |
2463 | ||
2464 | /* | |
2465 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2466 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2467 | */ | |
2468 | static int bc_sendto(struct rpc_rqst *req) | |
2469 | { | |
2470 | int len; | |
2471 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2472 | struct rpc_xprt *xprt = req->rq_xprt; | |
2473 | struct sock_xprt *transport = | |
2474 | container_of(xprt, struct sock_xprt, xprt); | |
2475 | struct socket *sock = transport->sock; | |
2476 | unsigned long headoff; | |
2477 | unsigned long tailoff; | |
2478 | ||
61677eee | 2479 | xs_encode_stream_record_marker(xbufp); |
4cfc7e60 RI |
2480 | |
2481 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2482 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2483 | len = svc_send_common(sock, xbufp, | |
2484 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2485 | xbufp->tail[0].iov_base, tailoff); | |
2486 | ||
2487 | if (len != xbufp->len) { | |
2488 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2489 | len = -EAGAIN; | |
2490 | } | |
2491 | ||
2492 | return len; | |
2493 | } | |
2494 | ||
2495 | /* | |
2496 | * The send routine. Borrows from svc_send | |
2497 | */ | |
2498 | static int bc_send_request(struct rpc_task *task) | |
2499 | { | |
2500 | struct rpc_rqst *req = task->tk_rqstp; | |
2501 | struct svc_xprt *xprt; | |
4cfc7e60 RI |
2502 | u32 len; |
2503 | ||
2504 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2505 | /* | |
2506 | * Get the server socket associated with this callback xprt | |
2507 | */ | |
2508 | xprt = req->rq_xprt->bc_xprt; | |
4cfc7e60 RI |
2509 | |
2510 | /* | |
2511 | * Grab the mutex to serialize data as the connection is shared | |
2512 | * with the fore channel | |
2513 | */ | |
2514 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2515 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2516 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2517 | return -EAGAIN; | |
2518 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2519 | } | |
2520 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2521 | len = -ENOTCONN; | |
2522 | else | |
2523 | len = bc_sendto(req); | |
2524 | mutex_unlock(&xprt->xpt_mutex); | |
2525 | ||
2526 | if (len > 0) | |
2527 | len = 0; | |
2528 | ||
2529 | return len; | |
2530 | } | |
2531 | ||
2532 | /* | |
2533 | * The close routine. Since this is client initiated, we do nothing | |
2534 | */ | |
2535 | ||
2536 | static void bc_close(struct rpc_xprt *xprt) | |
2537 | { | |
4cfc7e60 RI |
2538 | } |
2539 | ||
2540 | /* | |
2541 | * The xprt destroy routine. Again, because this connection is client | |
2542 | * initiated, we do nothing | |
2543 | */ | |
2544 | ||
2545 | static void bc_destroy(struct rpc_xprt *xprt) | |
2546 | { | |
4cfc7e60 RI |
2547 | } |
2548 | ||
176e21ee CL |
2549 | static struct rpc_xprt_ops xs_local_ops = { |
2550 | .reserve_xprt = xprt_reserve_xprt, | |
2551 | .release_xprt = xs_tcp_release_xprt, | |
f39c1bfb | 2552 | .alloc_slot = xprt_alloc_slot, |
176e21ee CL |
2553 | .rpcbind = xs_local_rpcbind, |
2554 | .set_port = xs_local_set_port, | |
dc107402 | 2555 | .connect = xs_local_connect, |
176e21ee CL |
2556 | .buf_alloc = rpc_malloc, |
2557 | .buf_free = rpc_free, | |
2558 | .send_request = xs_local_send_request, | |
2559 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2560 | .close = xs_close, | |
a1311d87 | 2561 | .destroy = xs_destroy, |
176e21ee CL |
2562 | .print_stats = xs_local_print_stats, |
2563 | }; | |
2564 | ||
262965f5 | 2565 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2566 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2567 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2568 | .release_xprt = xprt_release_xprt_cong, |
f39c1bfb | 2569 | .alloc_slot = xprt_alloc_slot, |
45160d62 | 2570 | .rpcbind = rpcb_getport_async, |
92200412 | 2571 | .set_port = xs_set_port, |
262965f5 | 2572 | .connect = xs_connect, |
02107148 CL |
2573 | .buf_alloc = rpc_malloc, |
2574 | .buf_free = rpc_free, | |
262965f5 | 2575 | .send_request = xs_udp_send_request, |
fe3aca29 | 2576 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2577 | .timer = xs_udp_timer, |
a58dd398 | 2578 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2579 | .close = xs_close, |
2580 | .destroy = xs_destroy, | |
262ca07d | 2581 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2582 | }; |
2583 | ||
2584 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2585 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2586 | .release_xprt = xs_tcp_release_xprt, |
f39c1bfb | 2587 | .alloc_slot = xprt_lock_and_alloc_slot, |
45160d62 | 2588 | .rpcbind = rpcb_getport_async, |
92200412 | 2589 | .set_port = xs_set_port, |
0b9e7943 | 2590 | .connect = xs_connect, |
02107148 CL |
2591 | .buf_alloc = rpc_malloc, |
2592 | .buf_free = rpc_free, | |
262965f5 | 2593 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2594 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
f75e6745 | 2595 | .close = xs_tcp_close, |
9903cd1c | 2596 | .destroy = xs_destroy, |
262ca07d | 2597 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2598 | }; |
2599 | ||
4cfc7e60 RI |
2600 | /* |
2601 | * The rpc_xprt_ops for the server backchannel | |
2602 | */ | |
2603 | ||
2604 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2605 | .reserve_xprt = xprt_reserve_xprt, | |
2606 | .release_xprt = xprt_release_xprt, | |
84e28a30 | 2607 | .alloc_slot = xprt_alloc_slot, |
4cfc7e60 RI |
2608 | .buf_alloc = bc_malloc, |
2609 | .buf_free = bc_free, | |
2610 | .send_request = bc_send_request, | |
2611 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2612 | .close = bc_close, | |
2613 | .destroy = bc_destroy, | |
2614 | .print_stats = xs_tcp_print_stats, | |
2615 | }; | |
2616 | ||
92476850 CL |
2617 | static int xs_init_anyaddr(const int family, struct sockaddr *sap) |
2618 | { | |
2619 | static const struct sockaddr_in sin = { | |
2620 | .sin_family = AF_INET, | |
2621 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
2622 | }; | |
2623 | static const struct sockaddr_in6 sin6 = { | |
2624 | .sin6_family = AF_INET6, | |
2625 | .sin6_addr = IN6ADDR_ANY_INIT, | |
2626 | }; | |
2627 | ||
2628 | switch (family) { | |
176e21ee CL |
2629 | case AF_LOCAL: |
2630 | break; | |
92476850 CL |
2631 | case AF_INET: |
2632 | memcpy(sap, &sin, sizeof(sin)); | |
2633 | break; | |
2634 | case AF_INET6: | |
2635 | memcpy(sap, &sin6, sizeof(sin6)); | |
2636 | break; | |
2637 | default: | |
2638 | dprintk("RPC: %s: Bad address family\n", __func__); | |
2639 | return -EAFNOSUPPORT; | |
2640 | } | |
2641 | return 0; | |
2642 | } | |
2643 | ||
3c341b0b | 2644 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
d9ba131d TM |
2645 | unsigned int slot_table_size, |
2646 | unsigned int max_slot_table_size) | |
c8541ecd CL |
2647 | { |
2648 | struct rpc_xprt *xprt; | |
ffc2e518 | 2649 | struct sock_xprt *new; |
c8541ecd | 2650 | |
96802a09 | 2651 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2652 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2653 | return ERR_PTR(-EBADF); |
2654 | } | |
2655 | ||
d9ba131d TM |
2656 | xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, |
2657 | max_slot_table_size); | |
bd1722d4 | 2658 | if (xprt == NULL) { |
46121cf7 CL |
2659 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2660 | "rpc_xprt\n"); | |
c8541ecd CL |
2661 | return ERR_PTR(-ENOMEM); |
2662 | } | |
c8541ecd | 2663 | |
bd1722d4 | 2664 | new = container_of(xprt, struct sock_xprt, xprt); |
96802a09 FM |
2665 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2666 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2667 | if (args->srcaddr) |
fbfffbd5 | 2668 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
92476850 CL |
2669 | else { |
2670 | int err; | |
2671 | err = xs_init_anyaddr(args->dstaddr->sa_family, | |
2672 | (struct sockaddr *)&new->srcaddr); | |
2aa13531 SK |
2673 | if (err != 0) { |
2674 | xprt_free(xprt); | |
92476850 | 2675 | return ERR_PTR(err); |
2aa13531 | 2676 | } |
92476850 | 2677 | } |
c8541ecd CL |
2678 | |
2679 | return xprt; | |
2680 | } | |
2681 | ||
176e21ee CL |
2682 | static const struct rpc_timeout xs_local_default_timeout = { |
2683 | .to_initval = 10 * HZ, | |
2684 | .to_maxval = 10 * HZ, | |
2685 | .to_retries = 2, | |
2686 | }; | |
2687 | ||
2688 | /** | |
2689 | * xs_setup_local - Set up transport to use an AF_LOCAL socket | |
2690 | * @args: rpc transport creation arguments | |
2691 | * | |
2692 | * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP | |
2693 | */ | |
2694 | static struct rpc_xprt *xs_setup_local(struct xprt_create *args) | |
2695 | { | |
2696 | struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; | |
2697 | struct sock_xprt *transport; | |
2698 | struct rpc_xprt *xprt; | |
2699 | struct rpc_xprt *ret; | |
2700 | ||
d9ba131d TM |
2701 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2702 | xprt_max_tcp_slot_table_entries); | |
176e21ee CL |
2703 | if (IS_ERR(xprt)) |
2704 | return xprt; | |
2705 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2706 | ||
2707 | xprt->prot = 0; | |
2708 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2709 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2710 | ||
2711 | xprt->bind_timeout = XS_BIND_TO; | |
2712 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2713 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
2714 | ||
2715 | xprt->ops = &xs_local_ops; | |
2716 | xprt->timeout = &xs_local_default_timeout; | |
2717 | ||
93dc41bd N |
2718 | INIT_DELAYED_WORK(&transport->connect_worker, |
2719 | xs_dummy_setup_socket); | |
2720 | ||
176e21ee CL |
2721 | switch (sun->sun_family) { |
2722 | case AF_LOCAL: | |
2723 | if (sun->sun_path[0] != '/') { | |
2724 | dprintk("RPC: bad AF_LOCAL address: %s\n", | |
2725 | sun->sun_path); | |
2726 | ret = ERR_PTR(-EINVAL); | |
2727 | goto out_err; | |
2728 | } | |
2729 | xprt_set_bound(xprt); | |
176e21ee | 2730 | xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); |
7073ea87 BF |
2731 | ret = ERR_PTR(xs_local_setup_socket(transport)); |
2732 | if (ret) | |
2733 | goto out_err; | |
176e21ee CL |
2734 | break; |
2735 | default: | |
2736 | ret = ERR_PTR(-EAFNOSUPPORT); | |
2737 | goto out_err; | |
2738 | } | |
2739 | ||
2740 | dprintk("RPC: set up xprt to %s via AF_LOCAL\n", | |
2741 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2742 | ||
2743 | if (try_module_get(THIS_MODULE)) | |
2744 | return xprt; | |
2745 | ret = ERR_PTR(-EINVAL); | |
2746 | out_err: | |
2747 | xprt_free(xprt); | |
2748 | return ret; | |
2749 | } | |
2750 | ||
2881ae74 TM |
2751 | static const struct rpc_timeout xs_udp_default_timeout = { |
2752 | .to_initval = 5 * HZ, | |
2753 | .to_maxval = 30 * HZ, | |
2754 | .to_increment = 5 * HZ, | |
2755 | .to_retries = 5, | |
2756 | }; | |
2757 | ||
9903cd1c CL |
2758 | /** |
2759 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2760 | * @args: rpc transport creation arguments |
9903cd1c CL |
2761 | * |
2762 | */ | |
483066d6 | 2763 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2764 | { |
8f9d5b1a | 2765 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2766 | struct rpc_xprt *xprt; |
c8475461 | 2767 | struct sock_xprt *transport; |
0a68b0be | 2768 | struct rpc_xprt *ret; |
a246b010 | 2769 | |
d9ba131d TM |
2770 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, |
2771 | xprt_udp_slot_table_entries); | |
c8541ecd CL |
2772 | if (IS_ERR(xprt)) |
2773 | return xprt; | |
c8475461 | 2774 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2775 | |
ec739ef0 | 2776 | xprt->prot = IPPROTO_UDP; |
808012fb | 2777 | xprt->tsh_size = 0; |
a246b010 CL |
2778 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2779 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2780 | ||
03bf4b70 | 2781 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2782 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2783 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2784 | |
262965f5 | 2785 | xprt->ops = &xs_udp_ops; |
a246b010 | 2786 | |
ba7392bb | 2787 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2788 | |
8f9d5b1a CL |
2789 | switch (addr->sa_family) { |
2790 | case AF_INET: | |
2791 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2792 | xprt_set_bound(xprt); | |
2793 | ||
2794 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2795 | xs_udp_setup_socket); |
9dc3b095 | 2796 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2797 | break; |
2798 | case AF_INET6: | |
2799 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2800 | xprt_set_bound(xprt); | |
2801 | ||
2802 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2803 | xs_udp_setup_socket); |
9dc3b095 | 2804 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2805 | break; |
2806 | default: | |
0a68b0be BF |
2807 | ret = ERR_PTR(-EAFNOSUPPORT); |
2808 | goto out_err; | |
8f9d5b1a CL |
2809 | } |
2810 | ||
c740eff8 CL |
2811 | if (xprt_bound(xprt)) |
2812 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2813 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2814 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2815 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2816 | else | |
2817 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2818 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2819 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2820 | |
bc25571e TT |
2821 | if (try_module_get(THIS_MODULE)) |
2822 | return xprt; | |
0a68b0be BF |
2823 | ret = ERR_PTR(-EINVAL); |
2824 | out_err: | |
e204e621 | 2825 | xprt_free(xprt); |
0a68b0be | 2826 | return ret; |
a246b010 CL |
2827 | } |
2828 | ||
2881ae74 TM |
2829 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2830 | .to_initval = 60 * HZ, | |
2831 | .to_maxval = 60 * HZ, | |
2832 | .to_retries = 2, | |
2833 | }; | |
2834 | ||
9903cd1c CL |
2835 | /** |
2836 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2837 | * @args: rpc transport creation arguments |
9903cd1c CL |
2838 | * |
2839 | */ | |
483066d6 | 2840 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2841 | { |
8f9d5b1a | 2842 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2843 | struct rpc_xprt *xprt; |
c8475461 | 2844 | struct sock_xprt *transport; |
0a68b0be | 2845 | struct rpc_xprt *ret; |
b7993ceb TM |
2846 | unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; |
2847 | ||
2848 | if (args->flags & XPRT_CREATE_INFINITE_SLOTS) | |
2849 | max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; | |
a246b010 | 2850 | |
d9ba131d | 2851 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
b7993ceb | 2852 | max_slot_table_size); |
c8541ecd CL |
2853 | if (IS_ERR(xprt)) |
2854 | return xprt; | |
c8475461 | 2855 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2856 | |
ec739ef0 | 2857 | xprt->prot = IPPROTO_TCP; |
808012fb | 2858 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2859 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2860 | |
03bf4b70 | 2861 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2862 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2863 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2864 | |
262965f5 | 2865 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2866 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2867 | |
8f9d5b1a CL |
2868 | switch (addr->sa_family) { |
2869 | case AF_INET: | |
2870 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2871 | xprt_set_bound(xprt); | |
2872 | ||
9dc3b095 | 2873 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2874 | xs_tcp_setup_socket); |
9dc3b095 | 2875 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2876 | break; |
2877 | case AF_INET6: | |
2878 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2879 | xprt_set_bound(xprt); | |
2880 | ||
9dc3b095 | 2881 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2882 | xs_tcp_setup_socket); |
9dc3b095 | 2883 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2884 | break; |
2885 | default: | |
0a68b0be BF |
2886 | ret = ERR_PTR(-EAFNOSUPPORT); |
2887 | goto out_err; | |
8f9d5b1a CL |
2888 | } |
2889 | ||
c740eff8 CL |
2890 | if (xprt_bound(xprt)) |
2891 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2892 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2893 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2894 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2895 | else | |
2896 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2897 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2898 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2899 | ||
edb267a6 | 2900 | |
bc25571e TT |
2901 | if (try_module_get(THIS_MODULE)) |
2902 | return xprt; | |
0a68b0be BF |
2903 | ret = ERR_PTR(-EINVAL); |
2904 | out_err: | |
e204e621 | 2905 | xprt_free(xprt); |
0a68b0be | 2906 | return ret; |
a246b010 | 2907 | } |
282b32e1 | 2908 | |
f300baba AB |
2909 | /** |
2910 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2911 | * @args: rpc transport creation arguments | |
2912 | * | |
2913 | */ | |
2914 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2915 | { | |
2916 | struct sockaddr *addr = args->dstaddr; | |
2917 | struct rpc_xprt *xprt; | |
2918 | struct sock_xprt *transport; | |
2919 | struct svc_sock *bc_sock; | |
0a68b0be | 2920 | struct rpc_xprt *ret; |
f300baba | 2921 | |
f0418aa4 BF |
2922 | if (args->bc_xprt->xpt_bc_xprt) { |
2923 | /* | |
2924 | * This server connection already has a backchannel | |
e3bfab18 BF |
2925 | * transport; we can't create a new one, as we wouldn't |
2926 | * be able to match replies based on xid any more. So, | |
f0418aa4 BF |
2927 | * reuse the already-existing one: |
2928 | */ | |
2929 | return args->bc_xprt->xpt_bc_xprt; | |
2930 | } | |
d9ba131d TM |
2931 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2932 | xprt_tcp_slot_table_entries); | |
f300baba AB |
2933 | if (IS_ERR(xprt)) |
2934 | return xprt; | |
2935 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2936 | ||
2937 | xprt->prot = IPPROTO_TCP; | |
2938 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2939 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2940 | xprt->timeout = &xs_tcp_default_timeout; | |
2941 | ||
2942 | /* backchannel */ | |
2943 | xprt_set_bound(xprt); | |
2944 | xprt->bind_timeout = 0; | |
f300baba AB |
2945 | xprt->reestablish_timeout = 0; |
2946 | xprt->idle_timeout = 0; | |
2947 | ||
f300baba AB |
2948 | xprt->ops = &bc_tcp_ops; |
2949 | ||
2950 | switch (addr->sa_family) { | |
2951 | case AF_INET: | |
2952 | xs_format_peer_addresses(xprt, "tcp", | |
2953 | RPCBIND_NETID_TCP); | |
2954 | break; | |
2955 | case AF_INET6: | |
2956 | xs_format_peer_addresses(xprt, "tcp", | |
2957 | RPCBIND_NETID_TCP6); | |
2958 | break; | |
2959 | default: | |
0a68b0be BF |
2960 | ret = ERR_PTR(-EAFNOSUPPORT); |
2961 | goto out_err; | |
f300baba AB |
2962 | } |
2963 | ||
50fa0d40 PE |
2964 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2965 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2966 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2967 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
f300baba | 2968 | |
99de8ea9 BF |
2969 | /* |
2970 | * Once we've associated a backchannel xprt with a connection, | |
28303ca3 WM |
2971 | * we want to keep it around as long as the connection lasts, |
2972 | * in case we need to start using it for a backchannel again; | |
2973 | * this reference won't be dropped until bc_xprt is destroyed. | |
99de8ea9 BF |
2974 | */ |
2975 | xprt_get(xprt); | |
2976 | args->bc_xprt->xpt_bc_xprt = xprt; | |
2977 | xprt->bc_xprt = args->bc_xprt; | |
2978 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
2979 | transport->sock = bc_sock->sk_sock; | |
2980 | transport->inet = bc_sock->sk_sk; | |
2981 | ||
f300baba AB |
2982 | /* |
2983 | * Since we don't want connections for the backchannel, we set | |
2984 | * the xprt status to connected | |
2985 | */ | |
2986 | xprt_set_connected(xprt); | |
2987 | ||
2988 | ||
2989 | if (try_module_get(THIS_MODULE)) | |
2990 | return xprt; | |
99de8ea9 | 2991 | xprt_put(xprt); |
0a68b0be BF |
2992 | ret = ERR_PTR(-EINVAL); |
2993 | out_err: | |
e204e621 | 2994 | xprt_free(xprt); |
0a68b0be | 2995 | return ret; |
f300baba AB |
2996 | } |
2997 | ||
176e21ee CL |
2998 | static struct xprt_class xs_local_transport = { |
2999 | .list = LIST_HEAD_INIT(xs_local_transport.list), | |
3000 | .name = "named UNIX socket", | |
3001 | .owner = THIS_MODULE, | |
3002 | .ident = XPRT_TRANSPORT_LOCAL, | |
3003 | .setup = xs_setup_local, | |
3004 | }; | |
3005 | ||
bc25571e TT |
3006 | static struct xprt_class xs_udp_transport = { |
3007 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
3008 | .name = "udp", | |
3009 | .owner = THIS_MODULE, | |
f300baba | 3010 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
3011 | .setup = xs_setup_udp, |
3012 | }; | |
3013 | ||
3014 | static struct xprt_class xs_tcp_transport = { | |
3015 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
3016 | .name = "tcp", | |
3017 | .owner = THIS_MODULE, | |
f300baba | 3018 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
3019 | .setup = xs_setup_tcp, |
3020 | }; | |
3021 | ||
f300baba AB |
3022 | static struct xprt_class xs_bc_tcp_transport = { |
3023 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
3024 | .name = "tcp NFSv4.1 backchannel", | |
3025 | .owner = THIS_MODULE, | |
3026 | .ident = XPRT_TRANSPORT_BC_TCP, | |
3027 | .setup = xs_setup_bc_tcp, | |
3028 | }; | |
3029 | ||
282b32e1 | 3030 | /** |
bc25571e | 3031 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
3032 | * |
3033 | */ | |
3034 | int init_socket_xprt(void) | |
3035 | { | |
fbf76683 | 3036 | #ifdef RPC_DEBUG |
2b1bec5f | 3037 | if (!sunrpc_table_header) |
0b4d4147 | 3038 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
3039 | #endif |
3040 | ||
176e21ee | 3041 | xprt_register_transport(&xs_local_transport); |
bc25571e TT |
3042 | xprt_register_transport(&xs_udp_transport); |
3043 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 3044 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 3045 | |
282b32e1 CL |
3046 | return 0; |
3047 | } | |
3048 | ||
3049 | /** | |
bc25571e | 3050 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
3051 | * |
3052 | */ | |
3053 | void cleanup_socket_xprt(void) | |
3054 | { | |
fbf76683 CL |
3055 | #ifdef RPC_DEBUG |
3056 | if (sunrpc_table_header) { | |
3057 | unregister_sysctl_table(sunrpc_table_header); | |
3058 | sunrpc_table_header = NULL; | |
3059 | } | |
3060 | #endif | |
bc25571e | 3061 | |
176e21ee | 3062 | xprt_unregister_transport(&xs_local_transport); |
bc25571e TT |
3063 | xprt_unregister_transport(&xs_udp_transport); |
3064 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 3065 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 3066 | } |
cbf11071 | 3067 | |
9bbb9e5a RR |
3068 | static int param_set_uint_minmax(const char *val, |
3069 | const struct kernel_param *kp, | |
cbf11071 TM |
3070 | unsigned int min, unsigned int max) |
3071 | { | |
3072 | unsigned long num; | |
3073 | int ret; | |
3074 | ||
3075 | if (!val) | |
3076 | return -EINVAL; | |
3077 | ret = strict_strtoul(val, 0, &num); | |
3078 | if (ret == -EINVAL || num < min || num > max) | |
3079 | return -EINVAL; | |
3080 | *((unsigned int *)kp->arg) = num; | |
3081 | return 0; | |
3082 | } | |
3083 | ||
9bbb9e5a | 3084 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
cbf11071 TM |
3085 | { |
3086 | return param_set_uint_minmax(val, kp, | |
3087 | RPC_MIN_RESVPORT, | |
3088 | RPC_MAX_RESVPORT); | |
3089 | } | |
3090 | ||
9bbb9e5a RR |
3091 | static struct kernel_param_ops param_ops_portnr = { |
3092 | .set = param_set_portnr, | |
3093 | .get = param_get_uint, | |
3094 | }; | |
3095 | ||
cbf11071 TM |
3096 | #define param_check_portnr(name, p) \ |
3097 | __param_check(name, p, unsigned int); | |
3098 | ||
3099 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
3100 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
3101 | ||
9bbb9e5a RR |
3102 | static int param_set_slot_table_size(const char *val, |
3103 | const struct kernel_param *kp) | |
cbf11071 TM |
3104 | { |
3105 | return param_set_uint_minmax(val, kp, | |
3106 | RPC_MIN_SLOT_TABLE, | |
3107 | RPC_MAX_SLOT_TABLE); | |
3108 | } | |
3109 | ||
9bbb9e5a RR |
3110 | static struct kernel_param_ops param_ops_slot_table_size = { |
3111 | .set = param_set_slot_table_size, | |
3112 | .get = param_get_uint, | |
3113 | }; | |
3114 | ||
cbf11071 TM |
3115 | #define param_check_slot_table_size(name, p) \ |
3116 | __param_check(name, p, unsigned int); | |
3117 | ||
d9ba131d TM |
3118 | static int param_set_max_slot_table_size(const char *val, |
3119 | const struct kernel_param *kp) | |
3120 | { | |
3121 | return param_set_uint_minmax(val, kp, | |
3122 | RPC_MIN_SLOT_TABLE, | |
3123 | RPC_MAX_SLOT_TABLE_LIMIT); | |
3124 | } | |
3125 | ||
3126 | static struct kernel_param_ops param_ops_max_slot_table_size = { | |
3127 | .set = param_set_max_slot_table_size, | |
3128 | .get = param_get_uint, | |
3129 | }; | |
3130 | ||
3131 | #define param_check_max_slot_table_size(name, p) \ | |
3132 | __param_check(name, p, unsigned int); | |
3133 | ||
cbf11071 TM |
3134 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
3135 | slot_table_size, 0644); | |
d9ba131d TM |
3136 | module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, |
3137 | max_slot_table_size, 0644); | |
cbf11071 TM |
3138 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
3139 | slot_table_size, 0644); | |
3140 |