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 | |
54c09874 TM |
66 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
67 | ||
7d1e8255 | 68 | #define XS_TCP_LINGER_TO (15U * HZ) |
25fe6142 | 69 | static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
7d1e8255 | 70 | |
fbf76683 CL |
71 | /* |
72 | * We can register our own files under /proc/sys/sunrpc by | |
73 | * calling register_sysctl_table() again. The files in that | |
74 | * directory become the union of all files registered there. | |
75 | * | |
76 | * We simply need to make sure that we don't collide with | |
77 | * someone else's file names! | |
78 | */ | |
79 | ||
fbf76683 CL |
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 | ||
f895b252 | 189 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
a246b010 | 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 | ||
2118071d TM |
219 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
220 | { | |
221 | return (struct rpc_xprt *) sk->sk_user_data; | |
222 | } | |
223 | ||
95392c59 CL |
224 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
225 | { | |
226 | return (struct sockaddr *) &xprt->addr; | |
227 | } | |
228 | ||
176e21ee CL |
229 | static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) |
230 | { | |
231 | return (struct sockaddr_un *) &xprt->addr; | |
232 | } | |
233 | ||
95392c59 | 234 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
edb267a6 | 235 | { |
95392c59 CL |
236 | return (struct sockaddr_in *) &xprt->addr; |
237 | } | |
238 | ||
239 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
240 | { | |
241 | return (struct sockaddr_in6 *) &xprt->addr; | |
242 | } | |
243 | ||
c877b849 | 244 | static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 245 | { |
c877b849 | 246 | struct sockaddr *sap = xs_addr(xprt); |
9dc3b095 CL |
247 | struct sockaddr_in6 *sin6; |
248 | struct sockaddr_in *sin; | |
176e21ee | 249 | struct sockaddr_un *sun; |
c877b849 | 250 | char buf[128]; |
edb267a6 | 251 | |
9dc3b095 | 252 | switch (sap->sa_family) { |
176e21ee CL |
253 | case AF_LOCAL: |
254 | sun = xs_addr_un(xprt); | |
255 | strlcpy(buf, sun->sun_path, sizeof(buf)); | |
256 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
257 | kstrdup(buf, GFP_KERNEL); | |
258 | break; | |
9dc3b095 | 259 | case AF_INET: |
176e21ee CL |
260 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
261 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
262 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 263 | sin = xs_addr_in(xprt); |
fc0b5791 | 264 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
9dc3b095 CL |
265 | break; |
266 | case AF_INET6: | |
176e21ee CL |
267 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
268 | xprt->address_strings[RPC_DISPLAY_ADDR] = | |
269 | kstrdup(buf, GFP_KERNEL); | |
9dc3b095 | 270 | sin6 = xs_addr_in6(xprt); |
fc0b5791 | 271 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
9dc3b095 CL |
272 | break; |
273 | default: | |
274 | BUG(); | |
756805e7 | 275 | } |
176e21ee | 276 | |
9dc3b095 | 277 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
edb267a6 CL |
278 | } |
279 | ||
9dc3b095 | 280 | static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
4b6473fb | 281 | { |
9dc3b095 CL |
282 | struct sockaddr *sap = xs_addr(xprt); |
283 | char buf[128]; | |
4b6473fb | 284 | |
81160e66 | 285 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 286 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
4b6473fb | 287 | |
81160e66 | 288 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 CL |
289 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
290 | } | |
4b6473fb | 291 | |
9dc3b095 CL |
292 | static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
293 | const char *protocol, | |
294 | const char *netid) | |
c877b849 | 295 | { |
b454ae90 | 296 | xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
b454ae90 | 297 | xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
c877b849 | 298 | xs_format_common_peer_addresses(xprt); |
9dc3b095 | 299 | xs_format_common_peer_ports(xprt); |
edb267a6 | 300 | } |
4b6473fb | 301 | |
9dc3b095 | 302 | static void xs_update_peer_port(struct rpc_xprt *xprt) |
4b6473fb | 303 | { |
9dc3b095 CL |
304 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
305 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); | |
4417c8c4 | 306 | |
9dc3b095 | 307 | xs_format_common_peer_ports(xprt); |
edb267a6 CL |
308 | } |
309 | ||
310 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
311 | { | |
33e01dc7 CL |
312 | unsigned int i; |
313 | ||
314 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
315 | switch (i) { | |
316 | case RPC_DISPLAY_PROTO: | |
317 | case RPC_DISPLAY_NETID: | |
318 | continue; | |
319 | default: | |
320 | kfree(xprt->address_strings[i]); | |
321 | } | |
edb267a6 CL |
322 | } |
323 | ||
b4b5cc85 CL |
324 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
325 | ||
24c5684b | 326 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 327 | { |
b4b5cc85 CL |
328 | struct msghdr msg = { |
329 | .msg_name = addr, | |
330 | .msg_namelen = addrlen, | |
24c5684b TM |
331 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
332 | }; | |
333 | struct kvec iov = { | |
334 | .iov_base = vec->iov_base + base, | |
335 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
336 | }; |
337 | ||
24c5684b | 338 | if (iov.iov_len != 0) |
b4b5cc85 CL |
339 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
340 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
341 | } | |
342 | ||
f279cd00 | 343 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p) |
b4b5cc85 | 344 | { |
a6b31d18 TM |
345 | ssize_t (*do_sendpage)(struct socket *sock, struct page *page, |
346 | int offset, size_t size, int flags); | |
24c5684b TM |
347 | struct page **ppage; |
348 | unsigned int remainder; | |
f279cd00 | 349 | int err; |
24c5684b TM |
350 | |
351 | remainder = xdr->page_len - base; | |
352 | base += xdr->page_base; | |
353 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
354 | base &= ~PAGE_MASK; | |
a6b31d18 TM |
355 | do_sendpage = sock->ops->sendpage; |
356 | if (!zerocopy) | |
357 | do_sendpage = sock_no_sendpage; | |
24c5684b TM |
358 | for(;;) { |
359 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
360 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 361 | |
24c5684b TM |
362 | remainder -= len; |
363 | if (remainder != 0 || more) | |
364 | flags |= MSG_MORE; | |
a6b31d18 | 365 | err = do_sendpage(sock, *ppage, base, len, flags); |
24c5684b TM |
366 | if (remainder == 0 || err != len) |
367 | break; | |
f279cd00 | 368 | *sent_p += err; |
24c5684b TM |
369 | ppage++; |
370 | base = 0; | |
371 | } | |
f279cd00 JB |
372 | if (err > 0) { |
373 | *sent_p += err; | |
374 | err = 0; | |
375 | } | |
376 | return err; | |
b4b5cc85 CL |
377 | } |
378 | ||
9903cd1c CL |
379 | /** |
380 | * xs_sendpages - write pages directly to a socket | |
381 | * @sock: socket to send on | |
382 | * @addr: UDP only -- address of destination | |
383 | * @addrlen: UDP only -- length of destination address | |
384 | * @xdr: buffer containing this request | |
385 | * @base: starting position in the buffer | |
a6b31d18 | 386 | * @zerocopy: true if it is safe to use sendpage() |
f279cd00 | 387 | * @sent_p: return the total number of bytes successfully queued for sending |
9903cd1c | 388 | * |
a246b010 | 389 | */ |
f279cd00 | 390 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p) |
a246b010 | 391 | { |
24c5684b | 392 | unsigned int remainder = xdr->len - base; |
f279cd00 JB |
393 | int err = 0; |
394 | int sent = 0; | |
a246b010 | 395 | |
262965f5 | 396 | if (unlikely(!sock)) |
fba91afb | 397 | return -ENOTSOCK; |
262965f5 CL |
398 | |
399 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
400 | if (base != 0) { |
401 | addr = NULL; | |
402 | addrlen = 0; | |
403 | } | |
262965f5 | 404 | |
24c5684b TM |
405 | if (base < xdr->head[0].iov_len || addr != NULL) { |
406 | unsigned int len = xdr->head[0].iov_len - base; | |
407 | remainder -= len; | |
408 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
409 | if (remainder == 0 || err != len) | |
a246b010 | 410 | goto out; |
f279cd00 | 411 | *sent_p += err; |
a246b010 CL |
412 | base = 0; |
413 | } else | |
24c5684b | 414 | base -= xdr->head[0].iov_len; |
a246b010 | 415 | |
24c5684b TM |
416 | if (base < xdr->page_len) { |
417 | unsigned int len = xdr->page_len - base; | |
418 | remainder -= len; | |
f279cd00 JB |
419 | err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent); |
420 | *sent_p += sent; | |
421 | if (remainder == 0 || sent != len) | |
a246b010 CL |
422 | goto out; |
423 | base = 0; | |
24c5684b TM |
424 | } else |
425 | base -= xdr->page_len; | |
426 | ||
427 | if (base >= xdr->tail[0].iov_len) | |
f279cd00 | 428 | return 0; |
24c5684b | 429 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); |
a246b010 | 430 | out: |
f279cd00 JB |
431 | if (err > 0) { |
432 | *sent_p += err; | |
433 | err = 0; | |
434 | } | |
435 | return err; | |
a246b010 CL |
436 | } |
437 | ||
b6ddf64f TM |
438 | static void xs_nospace_callback(struct rpc_task *task) |
439 | { | |
440 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
441 | ||
442 | transport->inet->sk_write_pending--; | |
443 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
444 | } | |
445 | ||
9903cd1c | 446 | /** |
262965f5 CL |
447 | * xs_nospace - place task on wait queue if transmit was incomplete |
448 | * @task: task to put to sleep | |
9903cd1c | 449 | * |
a246b010 | 450 | */ |
5e3771ce | 451 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 452 | { |
262965f5 CL |
453 | struct rpc_rqst *req = task->tk_rqstp; |
454 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 455 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
06ea0bfe | 456 | struct sock *sk = transport->inet; |
24ca9a84 | 457 | int ret = -EAGAIN; |
a246b010 | 458 | |
46121cf7 | 459 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
460 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
461 | req->rq_slen); | |
462 | ||
b6ddf64f TM |
463 | /* Protect against races with write_space */ |
464 | spin_lock_bh(&xprt->transport_lock); | |
465 | ||
466 | /* Don't race with disconnect */ | |
467 | if (xprt_connected(xprt)) { | |
468 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { | |
469 | /* | |
470 | * Notify TCP that we're limited by the application | |
471 | * window size | |
472 | */ | |
473 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
06ea0bfe | 474 | sk->sk_write_pending++; |
b6ddf64f TM |
475 | /* ...and wait for more buffer space */ |
476 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
477 | } | |
478 | } else { | |
479 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); | |
5e3771ce | 480 | ret = -ENOTCONN; |
b6ddf64f | 481 | } |
262965f5 | 482 | |
b6ddf64f | 483 | spin_unlock_bh(&xprt->transport_lock); |
06ea0bfe TM |
484 | |
485 | /* Race breaker in case memory is freed before above code is called */ | |
486 | sk->sk_write_space(sk); | |
5e3771ce | 487 | return ret; |
262965f5 CL |
488 | } |
489 | ||
61677eee CL |
490 | /* |
491 | * Construct a stream transport record marker in @buf. | |
492 | */ | |
493 | static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) | |
494 | { | |
495 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
496 | rpc_fraghdr *base = buf->head[0].iov_base; | |
497 | *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); | |
498 | } | |
499 | ||
176e21ee CL |
500 | /** |
501 | * xs_local_send_request - write an RPC request to an AF_LOCAL socket | |
502 | * @task: RPC task that manages the state of an RPC request | |
503 | * | |
504 | * Return values: | |
505 | * 0: The request has been sent | |
506 | * EAGAIN: The socket was blocked, please call again later to | |
507 | * complete the request | |
508 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
509 | * other: Some other error occured, the request was not sent | |
510 | */ | |
511 | static int xs_local_send_request(struct rpc_task *task) | |
512 | { | |
513 | struct rpc_rqst *req = task->tk_rqstp; | |
514 | struct rpc_xprt *xprt = req->rq_xprt; | |
515 | struct sock_xprt *transport = | |
516 | container_of(xprt, struct sock_xprt, xprt); | |
517 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
518 | int status; | |
f279cd00 | 519 | int sent = 0; |
176e21ee CL |
520 | |
521 | xs_encode_stream_record_marker(&req->rq_snd_buf); | |
522 | ||
523 | xs_pktdump("packet data:", | |
524 | req->rq_svec->iov_base, req->rq_svec->iov_len); | |
525 | ||
f279cd00 JB |
526 | status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent, |
527 | true, &sent); | |
176e21ee CL |
528 | dprintk("RPC: %s(%u) = %d\n", |
529 | __func__, xdr->len - req->rq_bytes_sent, status); | |
f279cd00 JB |
530 | if (likely(sent > 0) || status == 0) { |
531 | req->rq_bytes_sent += sent; | |
532 | req->rq_xmit_bytes_sent += sent; | |
176e21ee CL |
533 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
534 | req->rq_bytes_sent = 0; | |
535 | return 0; | |
536 | } | |
537 | status = -EAGAIN; | |
538 | } | |
539 | ||
540 | switch (status) { | |
3601c4a9 | 541 | case -ENOBUFS: |
176e21ee CL |
542 | case -EAGAIN: |
543 | status = xs_nospace(task); | |
544 | break; | |
545 | default: | |
546 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
547 | -status); | |
548 | case -EPIPE: | |
549 | xs_close(xprt); | |
550 | status = -ENOTCONN; | |
551 | } | |
552 | ||
553 | return status; | |
554 | } | |
555 | ||
262965f5 CL |
556 | /** |
557 | * xs_udp_send_request - write an RPC request to a UDP socket | |
558 | * @task: address of RPC task that manages the state of an RPC request | |
559 | * | |
560 | * Return values: | |
561 | * 0: The request has been sent | |
562 | * EAGAIN: The socket was blocked, please call again later to | |
563 | * complete the request | |
564 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 565 | * other: Some other error occurred, the request was not sent |
262965f5 CL |
566 | */ |
567 | static int xs_udp_send_request(struct rpc_task *task) | |
568 | { | |
569 | struct rpc_rqst *req = task->tk_rqstp; | |
570 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 571 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 572 | struct xdr_buf *xdr = &req->rq_snd_buf; |
f279cd00 | 573 | int sent = 0; |
262965f5 | 574 | int status; |
a246b010 | 575 | |
9903cd1c | 576 | xs_pktdump("packet data:", |
a246b010 CL |
577 | req->rq_svec->iov_base, |
578 | req->rq_svec->iov_len); | |
579 | ||
01d37c42 TM |
580 | if (!xprt_bound(xprt)) |
581 | return -ENOTCONN; | |
f279cd00 JB |
582 | status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, |
583 | xdr, req->rq_bytes_sent, true, &sent); | |
a246b010 | 584 | |
46121cf7 | 585 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 586 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 587 | |
3dedbb5c JB |
588 | /* firewall is blocking us, don't return -EAGAIN or we end up looping */ |
589 | if (status == -EPERM) | |
590 | goto process_status; | |
591 | ||
f279cd00 JB |
592 | if (sent > 0 || status == 0) { |
593 | req->rq_xmit_bytes_sent += sent; | |
594 | if (sent >= req->rq_slen) | |
2199700f TM |
595 | return 0; |
596 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 597 | status = -EAGAIN; |
2199700f | 598 | } |
a246b010 | 599 | |
3dedbb5c | 600 | process_status: |
262965f5 | 601 | switch (status) { |
fba91afb TM |
602 | case -ENOTSOCK: |
603 | status = -ENOTCONN; | |
604 | /* Should we call xs_close() here? */ | |
605 | break; | |
b6ddf64f | 606 | case -EAGAIN: |
5e3771ce | 607 | status = xs_nospace(task); |
b6ddf64f | 608 | break; |
c8485e4d TM |
609 | default: |
610 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
611 | -status); | |
262965f5 | 612 | case -ENETUNREACH: |
3601c4a9 | 613 | case -ENOBUFS: |
262965f5 | 614 | case -EPIPE: |
a246b010 | 615 | case -ECONNREFUSED: |
3dedbb5c | 616 | case -EPERM: |
a246b010 | 617 | /* When the server has died, an ICMP port unreachable message |
9903cd1c | 618 | * prompts ECONNREFUSED. */ |
b6ddf64f | 619 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 620 | } |
5fe46e9d | 621 | |
262965f5 | 622 | return status; |
a246b010 CL |
623 | } |
624 | ||
e06799f9 TM |
625 | /** |
626 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
627 | * @xprt: transport | |
628 | * | |
629 | * Initiates a graceful shutdown of the TCP socket by calling the | |
0efeac26 | 630 | * equivalent of shutdown(SHUT_RDWR); |
e06799f9 TM |
631 | */ |
632 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
633 | { | |
634 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
635 | struct socket *sock = transport->sock; | |
636 | ||
40b5ea0c | 637 | if (sock != NULL) { |
0efeac26 | 638 | kernel_sock_shutdown(sock, SHUT_RDWR); |
40b5ea0c TM |
639 | trace_rpc_socket_shutdown(xprt, sock); |
640 | } | |
e06799f9 TM |
641 | } |
642 | ||
9903cd1c | 643 | /** |
262965f5 | 644 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
645 | * @task: address of RPC task that manages the state of an RPC request |
646 | * | |
647 | * Return values: | |
262965f5 CL |
648 | * 0: The request has been sent |
649 | * EAGAIN: The socket was blocked, please call again later to | |
650 | * complete the request | |
651 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 652 | * other: Some other error occurred, the request was not sent |
9903cd1c CL |
653 | * |
654 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 655 | * if sendmsg is not able to make progress? |
9903cd1c | 656 | */ |
262965f5 | 657 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
658 | { |
659 | struct rpc_rqst *req = task->tk_rqstp; | |
660 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 661 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 662 | struct xdr_buf *xdr = &req->rq_snd_buf; |
a6b31d18 | 663 | bool zerocopy = true; |
b595bb15 | 664 | int status; |
f279cd00 | 665 | int sent; |
a246b010 | 666 | |
61677eee | 667 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
a246b010 | 668 | |
262965f5 CL |
669 | xs_pktdump("packet data:", |
670 | req->rq_svec->iov_base, | |
671 | req->rq_svec->iov_len); | |
a6b31d18 TM |
672 | /* Don't use zero copy if this is a resend. If the RPC call |
673 | * completes while the socket holds a reference to the pages, | |
674 | * then we may end up resending corrupted data. | |
675 | */ | |
676 | if (task->tk_flags & RPC_TASK_SENT) | |
677 | zerocopy = false; | |
a246b010 CL |
678 | |
679 | /* Continue transmitting the packet/record. We must be careful | |
680 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 681 | * called sendmsg(). */ |
a246b010 | 682 | while (1) { |
f279cd00 JB |
683 | sent = 0; |
684 | status = xs_sendpages(transport->sock, NULL, 0, xdr, | |
685 | req->rq_bytes_sent, zerocopy, &sent); | |
a246b010 | 686 | |
46121cf7 | 687 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 688 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 689 | |
f279cd00 | 690 | if (unlikely(sent == 0 && status < 0)) |
a246b010 | 691 | break; |
a246b010 | 692 | |
262965f5 CL |
693 | /* If we've sent the entire packet, immediately |
694 | * reset the count of bytes sent. */ | |
f279cd00 JB |
695 | req->rq_bytes_sent += sent; |
696 | req->rq_xmit_bytes_sent += sent; | |
262965f5 CL |
697 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
698 | req->rq_bytes_sent = 0; | |
699 | return 0; | |
700 | } | |
a246b010 | 701 | |
f279cd00 | 702 | if (sent != 0) |
06b4b681 | 703 | continue; |
a246b010 | 704 | status = -EAGAIN; |
06b4b681 | 705 | break; |
a246b010 CL |
706 | } |
707 | ||
262965f5 | 708 | switch (status) { |
fba91afb TM |
709 | case -ENOTSOCK: |
710 | status = -ENOTCONN; | |
711 | /* Should we call xs_close() here? */ | |
712 | break; | |
3601c4a9 | 713 | case -ENOBUFS: |
262965f5 | 714 | case -EAGAIN: |
5e3771ce | 715 | status = xs_nospace(task); |
262965f5 | 716 | break; |
c8485e4d TM |
717 | default: |
718 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
719 | -status); | |
262965f5 | 720 | case -ECONNRESET: |
2a9e1cfa | 721 | case -ECONNREFUSED: |
262965f5 | 722 | case -ENOTCONN: |
3913c78c | 723 | case -EADDRINUSE: |
b9d2bb2e | 724 | case -EPIPE: |
b6ddf64f | 725 | clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 726 | } |
5fe46e9d | 727 | |
a246b010 CL |
728 | return status; |
729 | } | |
730 | ||
e0ab53de TM |
731 | /** |
732 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
733 | * @xprt: transport | |
734 | * @task: rpc task | |
735 | * | |
736 | * This cleans up if an error causes us to abort the transmission of a request. | |
737 | * In this case, the socket may need to be reset in order to avoid confusing | |
738 | * the server. | |
739 | */ | |
740 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
741 | { | |
742 | struct rpc_rqst *req; | |
743 | ||
744 | if (task != xprt->snd_task) | |
745 | return; | |
746 | if (task == NULL) | |
747 | goto out_release; | |
748 | req = task->tk_rqstp; | |
43cedbf0 TM |
749 | if (req == NULL) |
750 | goto out_release; | |
e0ab53de TM |
751 | if (req->rq_bytes_sent == 0) |
752 | goto out_release; | |
753 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
754 | goto out_release; | |
a4f0835c | 755 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
e0ab53de TM |
756 | out_release: |
757 | xprt_release_xprt(xprt, task); | |
758 | } | |
759 | ||
2a9e1cfa TM |
760 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
761 | { | |
762 | transport->old_data_ready = sk->sk_data_ready; | |
763 | transport->old_state_change = sk->sk_state_change; | |
764 | transport->old_write_space = sk->sk_write_space; | |
2118071d | 765 | transport->old_error_report = sk->sk_error_report; |
2a9e1cfa TM |
766 | } |
767 | ||
768 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
769 | { | |
770 | sk->sk_data_ready = transport->old_data_ready; | |
771 | sk->sk_state_change = transport->old_state_change; | |
772 | sk->sk_write_space = transport->old_write_space; | |
2118071d TM |
773 | sk->sk_error_report = transport->old_error_report; |
774 | } | |
775 | ||
b70ae915 TM |
776 | static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) |
777 | { | |
778 | smp_mb__before_atomic(); | |
779 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
780 | clear_bit(XPRT_CLOSING, &xprt->state); | |
781 | smp_mb__after_atomic(); | |
782 | } | |
783 | ||
784 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
785 | { | |
786 | xs_sock_reset_connection_flags(xprt); | |
787 | /* Mark transport as closed and wake up all pending tasks */ | |
788 | xprt_disconnect_done(xprt); | |
789 | } | |
790 | ||
2118071d TM |
791 | /** |
792 | * xs_error_report - callback to handle TCP socket state errors | |
793 | * @sk: socket | |
794 | * | |
795 | * Note: we don't call sock_error() since there may be a rpc_task | |
796 | * using the socket, and so we don't want to clear sk->sk_err. | |
797 | */ | |
798 | static void xs_error_report(struct sock *sk) | |
799 | { | |
800 | struct rpc_xprt *xprt; | |
801 | int err; | |
802 | ||
803 | read_lock_bh(&sk->sk_callback_lock); | |
804 | if (!(xprt = xprt_from_sock(sk))) | |
805 | goto out; | |
806 | ||
807 | err = -sk->sk_err; | |
808 | if (err == 0) | |
809 | goto out; | |
b70ae915 TM |
810 | /* Is this a reset event? */ |
811 | if (sk->sk_state == TCP_CLOSE) | |
812 | xs_sock_mark_closed(xprt); | |
2118071d TM |
813 | dprintk("RPC: xs_error_report client %p, error=%d...\n", |
814 | xprt, -err); | |
e8353c76 | 815 | trace_rpc_socket_error(xprt, sk->sk_socket, err); |
2118071d TM |
816 | xprt_wake_pending_tasks(xprt, err); |
817 | out: | |
818 | read_unlock_bh(&sk->sk_callback_lock); | |
2a9e1cfa TM |
819 | } |
820 | ||
fe315e76 | 821 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 822 | { |
ee0ac0c2 CL |
823 | struct socket *sock = transport->sock; |
824 | struct sock *sk = transport->inet; | |
6cc7e908 | 825 | struct rpc_xprt *xprt = &transport->xprt; |
a246b010 | 826 | |
fe315e76 CL |
827 | if (sk == NULL) |
828 | return; | |
9903cd1c | 829 | |
a246b010 | 830 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
831 | transport->inet = NULL; |
832 | transport->sock = NULL; | |
a246b010 | 833 | |
9903cd1c | 834 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
835 | |
836 | xs_restore_old_callbacks(transport, sk); | |
a246b010 | 837 | write_unlock_bh(&sk->sk_callback_lock); |
6cc7e908 | 838 | xs_sock_reset_connection_flags(xprt); |
a246b010 | 839 | |
6cc7e908 | 840 | trace_rpc_socket_close(xprt, sock); |
a246b010 | 841 | sock_release(sock); |
fe315e76 CL |
842 | } |
843 | ||
844 | /** | |
845 | * xs_close - close a socket | |
846 | * @xprt: transport | |
847 | * | |
848 | * This is used when all requests are complete; ie, no DRC state remains | |
849 | * on the server we want to save. | |
f75e6745 TM |
850 | * |
851 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
852 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
853 | */ |
854 | static void xs_close(struct rpc_xprt *xprt) | |
855 | { | |
856 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
857 | ||
858 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
859 | ||
860 | xs_reset_transport(transport); | |
61d0a8e6 | 861 | xprt->reestablish_timeout = 0; |
fe315e76 | 862 | |
62da3b24 | 863 | xprt_disconnect_done(xprt); |
a246b010 CL |
864 | } |
865 | ||
315f3812 KM |
866 | static void xs_xprt_free(struct rpc_xprt *xprt) |
867 | { | |
868 | xs_free_peer_addresses(xprt); | |
869 | xprt_free(xprt); | |
870 | } | |
871 | ||
9903cd1c CL |
872 | /** |
873 | * xs_destroy - prepare to shutdown a transport | |
874 | * @xprt: doomed transport | |
875 | * | |
876 | */ | |
877 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 878 | { |
46121cf7 | 879 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 880 | |
a1311d87 | 881 | xs_close(xprt); |
315f3812 | 882 | xs_xprt_free(xprt); |
a1311d87 | 883 | module_put(THIS_MODULE); |
a246b010 CL |
884 | } |
885 | ||
176e21ee CL |
886 | static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) |
887 | { | |
888 | struct xdr_skb_reader desc = { | |
889 | .skb = skb, | |
890 | .offset = sizeof(rpc_fraghdr), | |
891 | .count = skb->len - sizeof(rpc_fraghdr), | |
892 | }; | |
893 | ||
894 | if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) | |
895 | return -1; | |
896 | if (desc.count) | |
897 | return -1; | |
898 | return 0; | |
899 | } | |
900 | ||
901 | /** | |
902 | * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets | |
903 | * @sk: socket with data to read | |
904 | * @len: how much data to read | |
905 | * | |
906 | * Currently this assumes we can read the whole reply in a single gulp. | |
907 | */ | |
676d2369 | 908 | static void xs_local_data_ready(struct sock *sk) |
176e21ee CL |
909 | { |
910 | struct rpc_task *task; | |
911 | struct rpc_xprt *xprt; | |
912 | struct rpc_rqst *rovr; | |
913 | struct sk_buff *skb; | |
914 | int err, repsize, copied; | |
915 | u32 _xid; | |
916 | __be32 *xp; | |
917 | ||
918 | read_lock_bh(&sk->sk_callback_lock); | |
919 | dprintk("RPC: %s...\n", __func__); | |
920 | xprt = xprt_from_sock(sk); | |
921 | if (xprt == NULL) | |
922 | goto out; | |
923 | ||
924 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
925 | if (skb == NULL) | |
926 | goto out; | |
927 | ||
176e21ee CL |
928 | repsize = skb->len - sizeof(rpc_fraghdr); |
929 | if (repsize < 4) { | |
930 | dprintk("RPC: impossible RPC reply size %d\n", repsize); | |
931 | goto dropit; | |
932 | } | |
933 | ||
934 | /* Copy the XID from the skb... */ | |
935 | xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); | |
936 | if (xp == NULL) | |
937 | goto dropit; | |
938 | ||
939 | /* Look up and lock the request corresponding to the given XID */ | |
940 | spin_lock(&xprt->transport_lock); | |
941 | rovr = xprt_lookup_rqst(xprt, *xp); | |
942 | if (!rovr) | |
943 | goto out_unlock; | |
944 | task = rovr->rq_task; | |
945 | ||
946 | copied = rovr->rq_private_buf.buflen; | |
947 | if (copied > repsize) | |
948 | copied = repsize; | |
949 | ||
950 | if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { | |
951 | dprintk("RPC: sk_buff copy failed\n"); | |
952 | goto out_unlock; | |
953 | } | |
954 | ||
955 | xprt_complete_rqst(task, copied); | |
956 | ||
957 | out_unlock: | |
958 | spin_unlock(&xprt->transport_lock); | |
959 | dropit: | |
960 | skb_free_datagram(sk, skb); | |
961 | out: | |
962 | read_unlock_bh(&sk->sk_callback_lock); | |
963 | } | |
964 | ||
9903cd1c CL |
965 | /** |
966 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
967 | * @sk: socket with data to read | |
968 | * @len: how much data to read | |
969 | * | |
a246b010 | 970 | */ |
676d2369 | 971 | static void xs_udp_data_ready(struct sock *sk) |
a246b010 | 972 | { |
9903cd1c CL |
973 | struct rpc_task *task; |
974 | struct rpc_xprt *xprt; | |
a246b010 | 975 | struct rpc_rqst *rovr; |
9903cd1c | 976 | struct sk_buff *skb; |
a246b010 | 977 | int err, repsize, copied; |
d8ed029d AD |
978 | u32 _xid; |
979 | __be32 *xp; | |
a246b010 | 980 | |
f064af1e | 981 | read_lock_bh(&sk->sk_callback_lock); |
46121cf7 | 982 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 983 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 984 | goto out; |
a246b010 CL |
985 | |
986 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
987 | goto out; | |
988 | ||
a246b010 CL |
989 | repsize = skb->len - sizeof(struct udphdr); |
990 | if (repsize < 4) { | |
46121cf7 | 991 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
992 | goto dropit; |
993 | } | |
994 | ||
995 | /* Copy the XID from the skb... */ | |
996 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
997 | sizeof(_xid), &_xid); | |
998 | if (xp == NULL) | |
999 | goto dropit; | |
1000 | ||
1001 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 1002 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
1003 | rovr = xprt_lookup_rqst(xprt, *xp); |
1004 | if (!rovr) | |
1005 | goto out_unlock; | |
1006 | task = rovr->rq_task; | |
1007 | ||
a246b010 CL |
1008 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
1009 | copied = repsize; | |
1010 | ||
1011 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
1012 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
1013 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 1014 | goto out_unlock; |
1781f7f5 HX |
1015 | } |
1016 | ||
1017 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 | 1018 | |
6a24dfb6 | 1019 | xprt_adjust_cwnd(xprt, task, copied); |
1570c1e4 | 1020 | xprt_complete_rqst(task, copied); |
a246b010 CL |
1021 | |
1022 | out_unlock: | |
4a0f8c04 | 1023 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
1024 | dropit: |
1025 | skb_free_datagram(sk, skb); | |
1026 | out: | |
f064af1e | 1027 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1028 | } |
1029 | ||
a519fc7a TM |
1030 | /* |
1031 | * Helper function to force a TCP close if the server is sending | |
1032 | * junk and/or it has put us in CLOSE_WAIT | |
1033 | */ | |
1034 | static void xs_tcp_force_close(struct rpc_xprt *xprt) | |
1035 | { | |
a519fc7a TM |
1036 | xprt_force_disconnect(xprt); |
1037 | } | |
1038 | ||
dd456471 | 1039 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 1040 | { |
51971139 | 1041 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
1042 | size_t len, used; |
1043 | char *p; | |
1044 | ||
51971139 CL |
1045 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
1046 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 1047 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1048 | transport->tcp_offset += used; |
a246b010 CL |
1049 | if (used != len) |
1050 | return; | |
808012fb | 1051 | |
51971139 CL |
1052 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
1053 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 1054 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 1055 | else |
e136d092 | 1056 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 1057 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 1058 | |
e136d092 | 1059 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 1060 | transport->tcp_offset = 0; |
808012fb | 1061 | |
a246b010 | 1062 | /* Sanity check of the record length */ |
18dca02a | 1063 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 1064 | dprintk("RPC: invalid TCP record fragment length\n"); |
a519fc7a | 1065 | xs_tcp_force_close(xprt); |
9903cd1c | 1066 | return; |
a246b010 | 1067 | } |
46121cf7 | 1068 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 1069 | transport->tcp_reclen); |
a246b010 CL |
1070 | } |
1071 | ||
51971139 | 1072 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 1073 | { |
51971139 | 1074 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 1075 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 1076 | transport->tcp_offset = 0; |
e136d092 CL |
1077 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
1078 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1079 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 1080 | transport->tcp_copied = 0; |
a246b010 CL |
1081 | } |
1082 | } | |
1083 | } | |
1084 | ||
dd456471 | 1085 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1086 | { |
1087 | size_t len, used; | |
1088 | char *p; | |
1089 | ||
51971139 | 1090 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 1091 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 1092 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 1093 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1094 | transport->tcp_offset += used; |
a246b010 CL |
1095 | if (used != len) |
1096 | return; | |
e136d092 | 1097 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 1098 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 1099 | transport->tcp_copied = 4; |
18dca02a RL |
1100 | dprintk("RPC: reading %s XID %08x\n", |
1101 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
1102 | : "request with", | |
51971139 CL |
1103 | ntohl(transport->tcp_xid)); |
1104 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
1105 | } |
1106 | ||
18dca02a RL |
1107 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1108 | struct xdr_skb_reader *desc) | |
a246b010 | 1109 | { |
18dca02a RL |
1110 | size_t len, used; |
1111 | u32 offset; | |
b76ce561 | 1112 | char *p; |
18dca02a RL |
1113 | |
1114 | /* | |
1115 | * We want transport->tcp_offset to be 8 at the end of this routine | |
1116 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
1117 | * When this function is called for the first time, | |
1118 | * transport->tcp_offset is 4 (after having already read the xid). | |
1119 | */ | |
1120 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
b76ce561 | 1121 | len = sizeof(transport->tcp_calldir) - offset; |
18dca02a | 1122 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
b76ce561 TM |
1123 | p = ((char *) &transport->tcp_calldir) + offset; |
1124 | used = xdr_skb_read_bits(desc, p, len); | |
18dca02a RL |
1125 | transport->tcp_offset += used; |
1126 | if (used != len) | |
1127 | return; | |
f4a2e418 | 1128 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
f4a2e418 RL |
1129 | /* |
1130 | * We don't yet have the XDR buffer, so we will write the calldir | |
1131 | * out after we get the buffer from the 'struct rpc_rqst' | |
1132 | */ | |
b76ce561 TM |
1133 | switch (ntohl(transport->tcp_calldir)) { |
1134 | case RPC_REPLY: | |
1135 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1136 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1137 | transport->tcp_flags |= TCP_RPC_REPLY; |
b76ce561 TM |
1138 | break; |
1139 | case RPC_CALL: | |
1140 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1141 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1142 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
b76ce561 TM |
1143 | break; |
1144 | default: | |
1145 | dprintk("RPC: invalid request message type\n"); | |
a519fc7a | 1146 | xs_tcp_force_close(&transport->xprt); |
b76ce561 | 1147 | } |
18dca02a RL |
1148 | xs_tcp_check_fraghdr(transport); |
1149 | } | |
1150 | ||
44b98efd RL |
1151 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1152 | struct xdr_skb_reader *desc, | |
1153 | struct rpc_rqst *req) | |
a246b010 | 1154 | { |
44b98efd RL |
1155 | struct sock_xprt *transport = |
1156 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1157 | struct xdr_buf *rcvbuf; |
1158 | size_t len; | |
1159 | ssize_t r; | |
1160 | ||
a246b010 | 1161 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1162 | |
1163 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1164 | /* | |
1165 | * Save the RPC direction in the XDR buffer | |
1166 | */ | |
f4a2e418 | 1167 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
b76ce561 TM |
1168 | &transport->tcp_calldir, |
1169 | sizeof(transport->tcp_calldir)); | |
1170 | transport->tcp_copied += sizeof(transport->tcp_calldir); | |
f4a2e418 | 1171 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
a246b010 CL |
1172 | } |
1173 | ||
a246b010 | 1174 | len = desc->count; |
51971139 | 1175 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1176 | struct xdr_skb_reader my_desc; |
a246b010 | 1177 | |
51971139 | 1178 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1179 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1180 | my_desc.count = len; | |
51971139 | 1181 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1182 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1183 | desc->count -= r; |
1184 | desc->offset += r; | |
1185 | } else | |
51971139 | 1186 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1187 | desc, xdr_skb_read_bits); |
a246b010 CL |
1188 | |
1189 | if (r > 0) { | |
51971139 CL |
1190 | transport->tcp_copied += r; |
1191 | transport->tcp_offset += r; | |
a246b010 CL |
1192 | } |
1193 | if (r != len) { | |
1194 | /* Error when copying to the receive buffer, | |
1195 | * usually because we weren't able to allocate | |
1196 | * additional buffer pages. All we can do now | |
e136d092 | 1197 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1198 | * will not receive any additional updates, |
1199 | * and time out. | |
1200 | * Any remaining data from this record will | |
1201 | * be discarded. | |
1202 | */ | |
e136d092 | 1203 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1204 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1205 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1206 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1207 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1208 | xprt, transport->tcp_copied, | |
1209 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1210 | return; |
a246b010 CL |
1211 | } |
1212 | ||
46121cf7 | 1213 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1214 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1215 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1216 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1217 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1218 | |
1219 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1220 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1221 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1222 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1223 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 | 1224 | } |
44b98efd RL |
1225 | } |
1226 | ||
1227 | /* | |
1228 | * Finds the request corresponding to the RPC xid and invokes the common | |
1229 | * tcp read code to read the data. | |
1230 | */ | |
1231 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1232 | struct xdr_skb_reader *desc) | |
1233 | { | |
1234 | struct sock_xprt *transport = | |
1235 | container_of(xprt, struct sock_xprt, xprt); | |
1236 | struct rpc_rqst *req; | |
1237 | ||
1238 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1239 | ||
1240 | /* Find and lock the request corresponding to this xid */ | |
1241 | spin_lock(&xprt->transport_lock); | |
1242 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); | |
1243 | if (!req) { | |
1244 | dprintk("RPC: XID %08x request not found!\n", | |
1245 | ntohl(transport->tcp_xid)); | |
1246 | spin_unlock(&xprt->transport_lock); | |
1247 | return -1; | |
1248 | } | |
1249 | ||
1250 | xs_tcp_read_common(xprt, desc, req); | |
1251 | ||
e136d092 | 1252 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1253 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1254 | |
4a0f8c04 | 1255 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1256 | return 0; |
1257 | } | |
1258 | ||
9e00abc3 | 1259 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
44b98efd RL |
1260 | /* |
1261 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1262 | * tcp read code to read the data. The result is placed in the callback | |
1263 | * queue. | |
1264 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1265 | * connection and return -1. | |
1266 | */ | |
2ea24497 | 1267 | static int xs_tcp_read_callback(struct rpc_xprt *xprt, |
44b98efd RL |
1268 | struct xdr_skb_reader *desc) |
1269 | { | |
1270 | struct sock_xprt *transport = | |
1271 | container_of(xprt, struct sock_xprt, xprt); | |
1272 | struct rpc_rqst *req; | |
1273 | ||
2ea24497 TM |
1274 | /* Look up and lock the request corresponding to the given XID */ |
1275 | spin_lock(&xprt->transport_lock); | |
1276 | req = xprt_lookup_bc_request(xprt, transport->tcp_xid); | |
44b98efd | 1277 | if (req == NULL) { |
2ea24497 | 1278 | spin_unlock(&xprt->transport_lock); |
44b98efd RL |
1279 | printk(KERN_WARNING "Callback slot table overflowed\n"); |
1280 | xprt_force_disconnect(xprt); | |
1281 | return -1; | |
1282 | } | |
1283 | ||
44b98efd RL |
1284 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); |
1285 | xs_tcp_read_common(xprt, desc, req); | |
1286 | ||
2ea24497 TM |
1287 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
1288 | xprt_complete_bc_request(req, transport->tcp_copied); | |
1289 | spin_unlock(&xprt->transport_lock); | |
44b98efd RL |
1290 | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1295 | struct xdr_skb_reader *desc) | |
1296 | { | |
1297 | struct sock_xprt *transport = | |
1298 | container_of(xprt, struct sock_xprt, xprt); | |
1299 | ||
1300 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1301 | xs_tcp_read_reply(xprt, desc) : | |
1302 | xs_tcp_read_callback(xprt, desc); | |
1303 | } | |
1304 | #else | |
1305 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1306 | struct xdr_skb_reader *desc) | |
1307 | { | |
1308 | return xs_tcp_read_reply(xprt, desc); | |
1309 | } | |
9e00abc3 | 1310 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
44b98efd RL |
1311 | |
1312 | /* | |
1313 | * Read data off the transport. This can be either an RPC_CALL or an | |
1314 | * RPC_REPLY. Relay the processing to helper functions. | |
1315 | */ | |
1316 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1317 | struct xdr_skb_reader *desc) | |
1318 | { | |
1319 | struct sock_xprt *transport = | |
1320 | container_of(xprt, struct sock_xprt, xprt); | |
1321 | ||
1322 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1323 | xs_tcp_check_fraghdr(transport); | |
1324 | else { | |
1325 | /* | |
1326 | * The transport_lock protects the request handling. | |
1327 | * There's no need to hold it to update the tcp_flags. | |
1328 | */ | |
1329 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1330 | } | |
a246b010 CL |
1331 | } |
1332 | ||
dd456471 | 1333 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1334 | { |
1335 | size_t len; | |
1336 | ||
51971139 | 1337 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1338 | if (len > desc->count) |
1339 | len = desc->count; | |
1340 | desc->count -= len; | |
1341 | desc->offset += len; | |
51971139 | 1342 | transport->tcp_offset += len; |
46121cf7 | 1343 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1344 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1345 | } |
1346 | ||
9903cd1c | 1347 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1348 | { |
1349 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1350 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1351 | struct xdr_skb_reader desc = { |
a246b010 CL |
1352 | .skb = skb, |
1353 | .offset = offset, | |
1354 | .count = len, | |
9903cd1c | 1355 | }; |
a246b010 | 1356 | |
46121cf7 | 1357 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 | 1358 | do { |
1a867a08 | 1359 | trace_xs_tcp_data_recv(transport); |
a246b010 CL |
1360 | /* Read in a new fragment marker if necessary */ |
1361 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1362 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1363 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1364 | continue; |
1365 | } | |
1366 | /* Read in the xid if necessary */ | |
e136d092 | 1367 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1368 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1369 | continue; |
1370 | } | |
18dca02a | 1371 | /* Read in the call/reply flag */ |
f4a2e418 | 1372 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1373 | xs_tcp_read_calldir(transport, &desc); |
1374 | continue; | |
1375 | } | |
a246b010 | 1376 | /* Read in the request data */ |
e136d092 | 1377 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1378 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1379 | continue; |
1380 | } | |
1381 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1382 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1383 | } while (desc.count); |
1a867a08 | 1384 | trace_xs_tcp_data_recv(transport); |
46121cf7 | 1385 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1386 | return len - desc.count; |
1387 | } | |
1388 | ||
9903cd1c CL |
1389 | /** |
1390 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1391 | * @sk: socket with data to read | |
1392 | * @bytes: how much data to read | |
1393 | * | |
1394 | */ | |
676d2369 | 1395 | static void xs_tcp_data_ready(struct sock *sk) |
a246b010 CL |
1396 | { |
1397 | struct rpc_xprt *xprt; | |
1398 | read_descriptor_t rd_desc; | |
ff2d7db8 | 1399 | int read; |
3705ad64 | 1400 | unsigned long total = 0; |
a246b010 | 1401 | |
46121cf7 CL |
1402 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1403 | ||
f064af1e | 1404 | read_lock_bh(&sk->sk_callback_lock); |
3705ad64 JL |
1405 | if (!(xprt = xprt_from_sock(sk))) { |
1406 | read = 0; | |
a246b010 | 1407 | goto out; |
3705ad64 | 1408 | } |
61d0a8e6 NB |
1409 | /* Any data means we had a useful conversation, so |
1410 | * the we don't need to delay the next reconnect | |
1411 | */ | |
1412 | if (xprt->reestablish_timeout) | |
1413 | xprt->reestablish_timeout = 0; | |
1414 | ||
9903cd1c | 1415 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 | 1416 | rd_desc.arg.data = xprt; |
ff2d7db8 TM |
1417 | do { |
1418 | rd_desc.count = 65536; | |
1419 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); | |
3705ad64 JL |
1420 | if (read > 0) |
1421 | total += read; | |
ff2d7db8 | 1422 | } while (read > 0); |
a246b010 | 1423 | out: |
3705ad64 | 1424 | trace_xs_tcp_data_ready(xprt, read, total); |
f064af1e | 1425 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1426 | } |
1427 | ||
9903cd1c CL |
1428 | /** |
1429 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1430 | * @sk: socket whose state has changed | |
1431 | * | |
1432 | */ | |
1433 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1434 | { |
9903cd1c | 1435 | struct rpc_xprt *xprt; |
a246b010 | 1436 | |
f064af1e | 1437 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1438 | if (!(xprt = xprt_from_sock(sk))) |
1439 | goto out; | |
46121cf7 | 1440 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
669502ff | 1441 | dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
46121cf7 CL |
1442 | sk->sk_state, xprt_connected(xprt), |
1443 | sock_flag(sk, SOCK_DEAD), | |
669502ff AC |
1444 | sock_flag(sk, SOCK_ZAPPED), |
1445 | sk->sk_shutdown); | |
a246b010 | 1446 | |
40b5ea0c | 1447 | trace_rpc_socket_state_change(xprt, sk->sk_socket); |
a246b010 CL |
1448 | switch (sk->sk_state) { |
1449 | case TCP_ESTABLISHED: | |
f064af1e | 1450 | spin_lock(&xprt->transport_lock); |
a246b010 | 1451 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1452 | struct sock_xprt *transport = container_of(xprt, |
1453 | struct sock_xprt, xprt); | |
1454 | ||
a246b010 | 1455 | /* Reset TCP record info */ |
51971139 CL |
1456 | transport->tcp_offset = 0; |
1457 | transport->tcp_reclen = 0; | |
1458 | transport->tcp_copied = 0; | |
e136d092 CL |
1459 | transport->tcp_flags = |
1460 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
8b71798c | 1461 | xprt->connect_cookie++; |
51971139 | 1462 | |
2a491991 | 1463 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1464 | } |
f064af1e | 1465 | spin_unlock(&xprt->transport_lock); |
a246b010 | 1466 | break; |
3b948ae5 TM |
1467 | case TCP_FIN_WAIT1: |
1468 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1469 | xprt->connect_cookie++; |
663b8858 | 1470 | xprt->reestablish_timeout = 0; |
3b948ae5 | 1471 | set_bit(XPRT_CLOSING, &xprt->state); |
4e857c58 | 1472 | smp_mb__before_atomic(); |
3b948ae5 | 1473 | clear_bit(XPRT_CONNECTED, &xprt->state); |
ef803670 | 1474 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
4e857c58 | 1475 | smp_mb__after_atomic(); |
a246b010 | 1476 | break; |
632e3bdc | 1477 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1478 | /* The server initiated a shutdown of the socket */ |
7c1d71cf | 1479 | xprt->connect_cookie++; |
d0bea455 | 1480 | clear_bit(XPRT_CONNECTED, &xprt->state); |
a519fc7a | 1481 | xs_tcp_force_close(xprt); |
663b8858 TM |
1482 | case TCP_CLOSING: |
1483 | /* | |
1484 | * If the server closed down the connection, make sure that | |
1485 | * we back off before reconnecting | |
1486 | */ | |
1487 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1488 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1489 | break; |
1490 | case TCP_LAST_ACK: | |
670f9457 | 1491 | set_bit(XPRT_CLOSING, &xprt->state); |
4e857c58 | 1492 | smp_mb__before_atomic(); |
3b948ae5 | 1493 | clear_bit(XPRT_CONNECTED, &xprt->state); |
4e857c58 | 1494 | smp_mb__after_atomic(); |
3b948ae5 TM |
1495 | break; |
1496 | case TCP_CLOSE: | |
7d1e8255 | 1497 | xs_sock_mark_closed(xprt); |
a246b010 CL |
1498 | } |
1499 | out: | |
f064af1e | 1500 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1501 | } |
1502 | ||
1f0fa154 IJ |
1503 | static void xs_write_space(struct sock *sk) |
1504 | { | |
1505 | struct socket *sock; | |
1506 | struct rpc_xprt *xprt; | |
1507 | ||
1508 | if (unlikely(!(sock = sk->sk_socket))) | |
1509 | return; | |
1510 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1511 | ||
1512 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1513 | return; | |
1514 | if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) | |
1515 | return; | |
1516 | ||
1517 | xprt_write_space(xprt); | |
1518 | } | |
1519 | ||
9903cd1c | 1520 | /** |
c7b2cae8 CL |
1521 | * xs_udp_write_space - callback invoked when socket buffer space |
1522 | * becomes available | |
9903cd1c CL |
1523 | * @sk: socket whose state has changed |
1524 | * | |
a246b010 CL |
1525 | * Called when more output buffer space is available for this socket. |
1526 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1527 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1528 | * with a bunch of small requests. |
1529 | */ | |
c7b2cae8 | 1530 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1531 | { |
f064af1e | 1532 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1533 | |
c7b2cae8 | 1534 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1535 | if (sock_writeable(sk)) |
1536 | xs_write_space(sk); | |
a246b010 | 1537 | |
f064af1e | 1538 | read_unlock_bh(&sk->sk_callback_lock); |
c7b2cae8 | 1539 | } |
a246b010 | 1540 | |
c7b2cae8 CL |
1541 | /** |
1542 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1543 | * becomes available | |
1544 | * @sk: socket whose state has changed | |
1545 | * | |
1546 | * Called when more output buffer space is available for this socket. | |
1547 | * We try not to wake our writers until they can make "significant" | |
1548 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1549 | * with a bunch of small requests. | |
1550 | */ | |
1551 | static void xs_tcp_write_space(struct sock *sk) | |
1552 | { | |
f064af1e | 1553 | read_lock_bh(&sk->sk_callback_lock); |
c7b2cae8 CL |
1554 | |
1555 | /* from net/core/stream.c:sk_stream_write_space */ | |
64dc6130 | 1556 | if (sk_stream_is_writeable(sk)) |
1f0fa154 | 1557 | xs_write_space(sk); |
b6ddf64f | 1558 | |
f064af1e | 1559 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1560 | } |
1561 | ||
470056c2 | 1562 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1563 | { |
ee0ac0c2 CL |
1564 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1565 | struct sock *sk = transport->inet; | |
a246b010 | 1566 | |
7c6e066e | 1567 | if (transport->rcvsize) { |
a246b010 | 1568 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1569 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1570 | } |
7c6e066e | 1571 | if (transport->sndsize) { |
a246b010 | 1572 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1573 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1574 | sk->sk_write_space(sk); |
1575 | } | |
1576 | } | |
1577 | ||
43118c29 | 1578 | /** |
470056c2 | 1579 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1580 | * @xprt: generic transport |
470056c2 CL |
1581 | * @sndsize: requested size of send buffer, in bytes |
1582 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1583 | * |
470056c2 | 1584 | * Set socket send and receive buffer size limits. |
43118c29 | 1585 | */ |
470056c2 | 1586 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1587 | { |
7c6e066e CL |
1588 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1589 | ||
1590 | transport->sndsize = 0; | |
470056c2 | 1591 | if (sndsize) |
7c6e066e CL |
1592 | transport->sndsize = sndsize + 1024; |
1593 | transport->rcvsize = 0; | |
470056c2 | 1594 | if (rcvsize) |
7c6e066e | 1595 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1596 | |
1597 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1598 | } |
1599 | ||
46c0ee8b CL |
1600 | /** |
1601 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1602 | * @task: task that timed out | |
1603 | * | |
1604 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1605 | */ | |
6a24dfb6 | 1606 | static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) |
46c0ee8b | 1607 | { |
6a24dfb6 | 1608 | xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); |
46c0ee8b CL |
1609 | } |
1610 | ||
b85d8806 CL |
1611 | static unsigned short xs_get_random_port(void) |
1612 | { | |
1613 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
63862b5b | 1614 | unsigned short rand = (unsigned short) prandom_u32() % range; |
b85d8806 CL |
1615 | return rand + xprt_min_resvport; |
1616 | } | |
1617 | ||
4dda9c8a TM |
1618 | /** |
1619 | * xs_set_reuseaddr_port - set the socket's port and address reuse options | |
1620 | * @sock: socket | |
1621 | * | |
1622 | * Note that this function has to be called on all sockets that share the | |
1623 | * same port, and it must be called before binding. | |
1624 | */ | |
1625 | static void xs_sock_set_reuseport(struct socket *sock) | |
1626 | { | |
402e23b4 | 1627 | int opt = 1; |
4dda9c8a | 1628 | |
402e23b4 TM |
1629 | kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, |
1630 | (char *)&opt, sizeof(opt)); | |
4dda9c8a TM |
1631 | } |
1632 | ||
1633 | static unsigned short xs_sock_getport(struct socket *sock) | |
1634 | { | |
1635 | struct sockaddr_storage buf; | |
1636 | int buflen; | |
1637 | unsigned short port = 0; | |
1638 | ||
1639 | if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0) | |
1640 | goto out; | |
1641 | switch (buf.ss_family) { | |
1642 | case AF_INET6: | |
1643 | port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); | |
1644 | break; | |
1645 | case AF_INET: | |
1646 | port = ntohs(((struct sockaddr_in *)&buf)->sin_port); | |
1647 | } | |
1648 | out: | |
1649 | return port; | |
1650 | } | |
1651 | ||
92200412 CL |
1652 | /** |
1653 | * xs_set_port - reset the port number in the remote endpoint address | |
1654 | * @xprt: generic transport | |
1655 | * @port: new port number | |
1656 | * | |
1657 | */ | |
1658 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1659 | { | |
46121cf7 | 1660 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1661 | |
9dc3b095 CL |
1662 | rpc_set_port(xs_addr(xprt), port); |
1663 | xs_update_peer_port(xprt); | |
92200412 CL |
1664 | } |
1665 | ||
4dda9c8a TM |
1666 | static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) |
1667 | { | |
1668 | if (transport->srcport == 0) | |
1669 | transport->srcport = xs_sock_getport(sock); | |
1670 | } | |
1671 | ||
5d4ec932 | 1672 | static unsigned short xs_get_srcport(struct sock_xprt *transport) |
67a391d7 | 1673 | { |
fbfffbd5 | 1674 | unsigned short port = transport->srcport; |
67a391d7 TM |
1675 | |
1676 | if (port == 0 && transport->xprt.resvport) | |
1677 | port = xs_get_random_port(); | |
1678 | return port; | |
1679 | } | |
1680 | ||
baaf4e48 | 1681 | static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
67a391d7 | 1682 | { |
fbfffbd5 CL |
1683 | if (transport->srcport != 0) |
1684 | transport->srcport = 0; | |
67a391d7 TM |
1685 | if (!transport->xprt.resvport) |
1686 | return 0; | |
1687 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1688 | return xprt_max_resvport; | |
1689 | return --port; | |
1690 | } | |
beb59b68 | 1691 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
a246b010 | 1692 | { |
beb59b68 | 1693 | struct sockaddr_storage myaddr; |
67a391d7 | 1694 | int err, nloop = 0; |
5d4ec932 | 1695 | unsigned short port = xs_get_srcport(transport); |
67a391d7 | 1696 | unsigned short last; |
a246b010 | 1697 | |
0f7a622c CP |
1698 | /* |
1699 | * If we are asking for any ephemeral port (i.e. port == 0 && | |
1700 | * transport->xprt.resvport == 0), don't bind. Let the local | |
1701 | * port selection happen implicitly when the socket is used | |
1702 | * (for example at connect time). | |
1703 | * | |
1704 | * This ensures that we can continue to establish TCP | |
1705 | * connections even when all local ephemeral ports are already | |
1706 | * a part of some TCP connection. This makes no difference | |
1707 | * for UDP sockets, but also doens't harm them. | |
1708 | * | |
1709 | * If we're asking for any reserved port (i.e. port == 0 && | |
1710 | * transport->xprt.resvport == 1) xs_get_srcport above will | |
1711 | * ensure that port is non-zero and we will bind as needed. | |
1712 | */ | |
1713 | if (port == 0) | |
1714 | return 0; | |
1715 | ||
beb59b68 | 1716 | memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
a246b010 | 1717 | do { |
beb59b68 PE |
1718 | rpc_set_port((struct sockaddr *)&myaddr, port); |
1719 | err = kernel_bind(sock, (struct sockaddr *)&myaddr, | |
1720 | transport->xprt.addrlen); | |
a246b010 | 1721 | if (err == 0) { |
fbfffbd5 | 1722 | transport->srcport = port; |
d3bc9a1d | 1723 | break; |
a246b010 | 1724 | } |
67a391d7 | 1725 | last = port; |
baaf4e48 | 1726 | port = xs_next_srcport(transport, port); |
67a391d7 TM |
1727 | if (port > last) |
1728 | nloop++; | |
1729 | } while (err == -EADDRINUSE && nloop != 2); | |
90058d37 | 1730 | |
4232e863 | 1731 | if (myaddr.ss_family == AF_INET) |
beb59b68 PE |
1732 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
1733 | &((struct sockaddr_in *)&myaddr)->sin_addr, | |
1734 | port, err ? "failed" : "ok", err); | |
1735 | else | |
1736 | dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, | |
1737 | &((struct sockaddr_in6 *)&myaddr)->sin6_addr, | |
1738 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1739 | return err; |
1740 | } | |
1741 | ||
176e21ee CL |
1742 | /* |
1743 | * We don't support autobind on AF_LOCAL sockets | |
1744 | */ | |
1745 | static void xs_local_rpcbind(struct rpc_task *task) | |
1746 | { | |
3dc0da27 TM |
1747 | rcu_read_lock(); |
1748 | xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); | |
1749 | rcu_read_unlock(); | |
176e21ee CL |
1750 | } |
1751 | ||
1752 | static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1753 | { | |
1754 | } | |
beb59b68 | 1755 | |
ed07536e PZ |
1756 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1757 | static struct lock_class_key xs_key[2]; | |
1758 | static struct lock_class_key xs_slock_key[2]; | |
1759 | ||
176e21ee CL |
1760 | static inline void xs_reclassify_socketu(struct socket *sock) |
1761 | { | |
1762 | struct sock *sk = sock->sk; | |
1763 | ||
176e21ee CL |
1764 | sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", |
1765 | &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); | |
1766 | } | |
1767 | ||
8945ee5e | 1768 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1769 | { |
1770 | struct sock *sk = sock->sk; | |
8945ee5e | 1771 | |
8945ee5e CL |
1772 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1773 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1774 | } | |
ed07536e | 1775 | |
8945ee5e CL |
1776 | static inline void xs_reclassify_socket6(struct socket *sock) |
1777 | { | |
1778 | struct sock *sk = sock->sk; | |
ed07536e | 1779 | |
8945ee5e CL |
1780 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1781 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e | 1782 | } |
6bc9638a PE |
1783 | |
1784 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1785 | { | |
1b7a1819 WAA |
1786 | WARN_ON_ONCE(sock_owned_by_user(sock->sk)); |
1787 | if (sock_owned_by_user(sock->sk)) | |
1788 | return; | |
1789 | ||
4232e863 | 1790 | switch (family) { |
176e21ee CL |
1791 | case AF_LOCAL: |
1792 | xs_reclassify_socketu(sock); | |
1793 | break; | |
4232e863 | 1794 | case AF_INET: |
6bc9638a | 1795 | xs_reclassify_socket4(sock); |
4232e863 CL |
1796 | break; |
1797 | case AF_INET6: | |
6bc9638a | 1798 | xs_reclassify_socket6(sock); |
4232e863 CL |
1799 | break; |
1800 | } | |
6bc9638a | 1801 | } |
ed07536e | 1802 | #else |
176e21ee CL |
1803 | static inline void xs_reclassify_socketu(struct socket *sock) |
1804 | { | |
1805 | } | |
1806 | ||
8945ee5e CL |
1807 | static inline void xs_reclassify_socket4(struct socket *sock) |
1808 | { | |
1809 | } | |
1810 | ||
1811 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1812 | { |
1813 | } | |
6bc9638a PE |
1814 | |
1815 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1816 | { | |
1817 | } | |
ed07536e PZ |
1818 | #endif |
1819 | ||
93dc41bd N |
1820 | static void xs_dummy_setup_socket(struct work_struct *work) |
1821 | { | |
1822 | } | |
1823 | ||
6bc9638a | 1824 | static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
4dda9c8a TM |
1825 | struct sock_xprt *transport, int family, int type, |
1826 | int protocol, bool reuseport) | |
22f79326 PE |
1827 | { |
1828 | struct socket *sock; | |
1829 | int err; | |
1830 | ||
6bc9638a | 1831 | err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
22f79326 PE |
1832 | if (err < 0) { |
1833 | dprintk("RPC: can't create %d transport socket (%d).\n", | |
1834 | protocol, -err); | |
1835 | goto out; | |
1836 | } | |
6bc9638a | 1837 | xs_reclassify_socket(family, sock); |
22f79326 | 1838 | |
4dda9c8a TM |
1839 | if (reuseport) |
1840 | xs_sock_set_reuseport(sock); | |
1841 | ||
4cea288a BH |
1842 | err = xs_bind(transport, sock); |
1843 | if (err) { | |
22f79326 PE |
1844 | sock_release(sock); |
1845 | goto out; | |
1846 | } | |
1847 | ||
1848 | return sock; | |
1849 | out: | |
1850 | return ERR_PTR(err); | |
1851 | } | |
1852 | ||
176e21ee CL |
1853 | static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
1854 | struct socket *sock) | |
1855 | { | |
1856 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1857 | xprt); | |
1858 | ||
1859 | if (!transport->inet) { | |
1860 | struct sock *sk = sock->sk; | |
1861 | ||
1862 | write_lock_bh(&sk->sk_callback_lock); | |
1863 | ||
1864 | xs_save_old_callbacks(transport, sk); | |
1865 | ||
1866 | sk->sk_user_data = xprt; | |
1867 | sk->sk_data_ready = xs_local_data_ready; | |
1868 | sk->sk_write_space = xs_udp_write_space; | |
2118071d | 1869 | sk->sk_error_report = xs_error_report; |
176e21ee CL |
1870 | sk->sk_allocation = GFP_ATOMIC; |
1871 | ||
1872 | xprt_clear_connected(xprt); | |
1873 | ||
1874 | /* Reset to new socket */ | |
1875 | transport->sock = sock; | |
1876 | transport->inet = sk; | |
1877 | ||
1878 | write_unlock_bh(&sk->sk_callback_lock); | |
1879 | } | |
1880 | ||
1881 | /* Tell the socket layer to start connecting... */ | |
1882 | xprt->stat.connect_count++; | |
1883 | xprt->stat.connect_start = jiffies; | |
1884 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); | |
1885 | } | |
1886 | ||
1887 | /** | |
1888 | * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint | |
1889 | * @xprt: RPC transport to connect | |
1890 | * @transport: socket transport to connect | |
1891 | * @create_sock: function to create a socket of the correct type | |
176e21ee | 1892 | */ |
dc107402 | 1893 | static int xs_local_setup_socket(struct sock_xprt *transport) |
176e21ee | 1894 | { |
176e21ee CL |
1895 | struct rpc_xprt *xprt = &transport->xprt; |
1896 | struct socket *sock; | |
1897 | int status = -EIO; | |
1898 | ||
176e21ee CL |
1899 | status = __sock_create(xprt->xprt_net, AF_LOCAL, |
1900 | SOCK_STREAM, 0, &sock, 1); | |
1901 | if (status < 0) { | |
1902 | dprintk("RPC: can't create AF_LOCAL " | |
1903 | "transport socket (%d).\n", -status); | |
1904 | goto out; | |
1905 | } | |
1906 | xs_reclassify_socketu(sock); | |
1907 | ||
1908 | dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", | |
1909 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1910 | ||
1911 | status = xs_local_finish_connecting(xprt, sock); | |
40b5ea0c | 1912 | trace_rpc_socket_connect(xprt, sock, status); |
176e21ee CL |
1913 | switch (status) { |
1914 | case 0: | |
1915 | dprintk("RPC: xprt %p connected to %s\n", | |
1916 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1917 | xprt_set_connected(xprt); | |
3601c4a9 | 1918 | case -ENOBUFS: |
176e21ee CL |
1919 | break; |
1920 | case -ENOENT: | |
1921 | dprintk("RPC: xprt %p: socket %s does not exist\n", | |
1922 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1923 | break; | |
4a20a988 TM |
1924 | case -ECONNREFUSED: |
1925 | dprintk("RPC: xprt %p: connection refused for %s\n", | |
1926 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1927 | break; | |
176e21ee CL |
1928 | default: |
1929 | printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", | |
1930 | __func__, -status, | |
1931 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1932 | } | |
1933 | ||
1934 | out: | |
1935 | xprt_clear_connecting(xprt); | |
1936 | xprt_wake_pending_tasks(xprt, status); | |
dc107402 BF |
1937 | return status; |
1938 | } | |
1939 | ||
b6669737 | 1940 | static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
dc107402 | 1941 | { |
dc107402 BF |
1942 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1943 | int ret; | |
1944 | ||
1945 | if (RPC_IS_ASYNC(task)) { | |
1946 | /* | |
1947 | * We want the AF_LOCAL connect to be resolved in the | |
1948 | * filesystem namespace of the process making the rpc | |
1949 | * call. Thus we connect synchronously. | |
1950 | * | |
1951 | * If we want to support asynchronous AF_LOCAL calls, | |
1952 | * we'll need to figure out how to pass a namespace to | |
1953 | * connect. | |
1954 | */ | |
1955 | rpc_exit(task, -ENOTCONN); | |
1956 | return; | |
1957 | } | |
1958 | ret = xs_local_setup_socket(transport); | |
1959 | if (ret && !RPC_IS_SOFTCONN(task)) | |
1960 | msleep_interruptible(15000); | |
176e21ee CL |
1961 | } |
1962 | ||
a564b8f0 MG |
1963 | #ifdef CONFIG_SUNRPC_SWAP |
1964 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
1965 | { | |
1966 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1967 | xprt); | |
1968 | ||
1969 | if (xprt->swapper) | |
1970 | sk_set_memalloc(transport->inet); | |
1971 | } | |
1972 | ||
1973 | /** | |
1974 | * xs_swapper - Tag this transport as being used for swap. | |
1975 | * @xprt: transport to tag | |
1976 | * @enable: enable/disable | |
1977 | * | |
1978 | */ | |
1979 | int xs_swapper(struct rpc_xprt *xprt, int enable) | |
1980 | { | |
1981 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1982 | xprt); | |
1983 | int err = 0; | |
1984 | ||
1985 | if (enable) { | |
1986 | xprt->swapper++; | |
1987 | xs_set_memalloc(xprt); | |
1988 | } else if (xprt->swapper) { | |
1989 | xprt->swapper--; | |
1990 | sk_clear_memalloc(transport->inet); | |
1991 | } | |
1992 | ||
1993 | return err; | |
1994 | } | |
1995 | EXPORT_SYMBOL_GPL(xs_swapper); | |
1996 | #else | |
1997 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
1998 | { | |
1999 | } | |
2000 | #endif | |
2001 | ||
16be2d20 CL |
2002 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
2003 | { | |
2004 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
2005 | ||
2006 | if (!transport->inet) { | |
2007 | struct sock *sk = sock->sk; | |
2008 | ||
2009 | write_lock_bh(&sk->sk_callback_lock); | |
2010 | ||
2a9e1cfa TM |
2011 | xs_save_old_callbacks(transport, sk); |
2012 | ||
16be2d20 | 2013 | sk->sk_user_data = xprt; |
16be2d20 CL |
2014 | sk->sk_data_ready = xs_udp_data_ready; |
2015 | sk->sk_write_space = xs_udp_write_space; | |
16be2d20 CL |
2016 | sk->sk_allocation = GFP_ATOMIC; |
2017 | ||
2018 | xprt_set_connected(xprt); | |
2019 | ||
2020 | /* Reset to new socket */ | |
2021 | transport->sock = sock; | |
2022 | transport->inet = sk; | |
2023 | ||
a564b8f0 MG |
2024 | xs_set_memalloc(xprt); |
2025 | ||
16be2d20 CL |
2026 | write_unlock_bh(&sk->sk_callback_lock); |
2027 | } | |
2028 | xs_udp_do_set_buffer_size(xprt); | |
2029 | } | |
2030 | ||
8c14ff2a | 2031 | static void xs_udp_setup_socket(struct work_struct *work) |
a246b010 | 2032 | { |
34161db6 TM |
2033 | struct sock_xprt *transport = |
2034 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 2035 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 2036 | struct socket *sock = transport->sock; |
b65c0310 | 2037 | int status = -EIO; |
9903cd1c | 2038 | |
8c14ff2a | 2039 | sock = xs_create_sock(xprt, transport, |
4dda9c8a TM |
2040 | xs_addr(xprt)->sa_family, SOCK_DGRAM, |
2041 | IPPROTO_UDP, false); | |
b65c0310 | 2042 | if (IS_ERR(sock)) |
b0d93ad5 | 2043 | goto out; |
68e220bd | 2044 | |
c740eff8 CL |
2045 | dprintk("RPC: worker connecting xprt %p via %s to " |
2046 | "%s (port %s)\n", xprt, | |
2047 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2048 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2049 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
2050 | |
2051 | xs_udp_finish_connecting(xprt, sock); | |
40b5ea0c | 2052 | trace_rpc_socket_connect(xprt, sock, 0); |
b0d93ad5 CL |
2053 | status = 0; |
2054 | out: | |
718ba5b8 | 2055 | xprt_unlock_connect(xprt, transport); |
b0d93ad5 | 2056 | xprt_clear_connecting(xprt); |
7d1e8255 | 2057 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
2058 | } |
2059 | ||
16be2d20 | 2060 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 2061 | { |
16be2d20 | 2062 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
fe19a96b | 2063 | int ret = -ENOTCONN; |
edb267a6 | 2064 | |
ee0ac0c2 | 2065 | if (!transport->inet) { |
b0d93ad5 | 2066 | struct sock *sk = sock->sk; |
7f260e85 TM |
2067 | unsigned int keepidle = xprt->timeout->to_initval / HZ; |
2068 | unsigned int keepcnt = xprt->timeout->to_retries + 1; | |
2069 | unsigned int opt_on = 1; | |
2070 | ||
2071 | /* TCP Keepalive options */ | |
2072 | kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, | |
2073 | (char *)&opt_on, sizeof(opt_on)); | |
2074 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, | |
2075 | (char *)&keepidle, sizeof(keepidle)); | |
2076 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, | |
2077 | (char *)&keepidle, sizeof(keepidle)); | |
2078 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, | |
2079 | (char *)&keepcnt, sizeof(keepcnt)); | |
b0d93ad5 CL |
2080 | |
2081 | write_lock_bh(&sk->sk_callback_lock); | |
2082 | ||
2a9e1cfa TM |
2083 | xs_save_old_callbacks(transport, sk); |
2084 | ||
b0d93ad5 | 2085 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
2086 | sk->sk_data_ready = xs_tcp_data_ready; |
2087 | sk->sk_state_change = xs_tcp_state_change; | |
2088 | sk->sk_write_space = xs_tcp_write_space; | |
2118071d | 2089 | sk->sk_error_report = xs_error_report; |
b079fa7b | 2090 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
2091 | |
2092 | /* socket options */ | |
3167e12c | 2093 | sock_reset_flag(sk, SOCK_LINGER); |
3167e12c | 2094 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
b0d93ad5 CL |
2095 | |
2096 | xprt_clear_connected(xprt); | |
2097 | ||
2098 | /* Reset to new socket */ | |
ee0ac0c2 CL |
2099 | transport->sock = sock; |
2100 | transport->inet = sk; | |
b0d93ad5 CL |
2101 | |
2102 | write_unlock_bh(&sk->sk_callback_lock); | |
2103 | } | |
2104 | ||
01d37c42 | 2105 | if (!xprt_bound(xprt)) |
fe19a96b | 2106 | goto out; |
01d37c42 | 2107 | |
a564b8f0 MG |
2108 | xs_set_memalloc(xprt); |
2109 | ||
b0d93ad5 | 2110 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
2111 | xprt->stat.connect_count++; |
2112 | xprt->stat.connect_start = jiffies; | |
fe19a96b TM |
2113 | ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
2114 | switch (ret) { | |
2115 | case 0: | |
4dda9c8a | 2116 | xs_set_srcport(transport, sock); |
fe19a96b TM |
2117 | case -EINPROGRESS: |
2118 | /* SYN_SENT! */ | |
fe19a96b TM |
2119 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2120 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2121 | } | |
2122 | out: | |
2123 | return ret; | |
16be2d20 CL |
2124 | } |
2125 | ||
9903cd1c | 2126 | /** |
b61d59ff TM |
2127 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
2128 | * @xprt: RPC transport to connect | |
2129 | * @transport: socket transport to connect | |
2130 | * @create_sock: function to create a socket of the correct type | |
9903cd1c CL |
2131 | * |
2132 | * Invoked by a work queue tasklet. | |
a246b010 | 2133 | */ |
cdd518d5 | 2134 | static void xs_tcp_setup_socket(struct work_struct *work) |
a246b010 | 2135 | { |
cdd518d5 PE |
2136 | struct sock_xprt *transport = |
2137 | container_of(work, struct sock_xprt, connect_worker.work); | |
ee0ac0c2 | 2138 | struct socket *sock = transport->sock; |
a9f5f0f7 | 2139 | struct rpc_xprt *xprt = &transport->xprt; |
b61d59ff | 2140 | int status = -EIO; |
a246b010 | 2141 | |
ee0ac0c2 | 2142 | if (!sock) { |
cdd518d5 | 2143 | sock = xs_create_sock(xprt, transport, |
4dda9c8a TM |
2144 | xs_addr(xprt)->sa_family, SOCK_STREAM, |
2145 | IPPROTO_TCP, true); | |
b61d59ff TM |
2146 | if (IS_ERR(sock)) { |
2147 | status = PTR_ERR(sock); | |
3167e12c CL |
2148 | goto out; |
2149 | } | |
7d1e8255 | 2150 | } |
a246b010 | 2151 | |
c740eff8 CL |
2152 | dprintk("RPC: worker connecting xprt %p via %s to " |
2153 | "%s (port %s)\n", xprt, | |
2154 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2155 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2156 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 2157 | |
16be2d20 | 2158 | status = xs_tcp_finish_connecting(xprt, sock); |
40b5ea0c | 2159 | trace_rpc_socket_connect(xprt, sock, status); |
46121cf7 CL |
2160 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
2161 | xprt, -status, xprt_connected(xprt), | |
2162 | sock->sk->sk_state); | |
2a491991 | 2163 | switch (status) { |
f75e6745 TM |
2164 | default: |
2165 | printk("%s: connect returned unhandled error %d\n", | |
2166 | __func__, status); | |
2167 | case -EADDRNOTAVAIL: | |
2168 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
2169 | * and retry | |
2170 | */ | |
a519fc7a | 2171 | xs_tcp_force_close(xprt); |
88b5ed73 | 2172 | break; |
2a491991 TM |
2173 | case 0: |
2174 | case -EINPROGRESS: | |
2175 | case -EALREADY: | |
718ba5b8 | 2176 | xprt_unlock_connect(xprt, transport); |
7d1e8255 TM |
2177 | xprt_clear_connecting(xprt); |
2178 | return; | |
9fcfe0c8 TM |
2179 | case -EINVAL: |
2180 | /* Happens, for instance, if the user specified a link | |
2181 | * local IPv6 address without a scope-id. | |
2182 | */ | |
3ed5e2a2 TM |
2183 | case -ECONNREFUSED: |
2184 | case -ECONNRESET: | |
2185 | case -ENETUNREACH: | |
3913c78c | 2186 | case -EADDRINUSE: |
3601c4a9 | 2187 | case -ENOBUFS: |
3ed5e2a2 | 2188 | /* retry with existing socket, after a delay */ |
4efdd92c | 2189 | xs_tcp_force_close(xprt); |
9fcfe0c8 | 2190 | goto out; |
a246b010 | 2191 | } |
2a491991 | 2192 | status = -EAGAIN; |
a246b010 | 2193 | out: |
718ba5b8 | 2194 | xprt_unlock_connect(xprt, transport); |
68e220bd | 2195 | xprt_clear_connecting(xprt); |
7d1e8255 | 2196 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 2197 | } |
b0d93ad5 | 2198 | |
9903cd1c CL |
2199 | /** |
2200 | * xs_connect - connect a socket to a remote endpoint | |
1b092092 | 2201 | * @xprt: pointer to transport structure |
9903cd1c CL |
2202 | * @task: address of RPC task that manages state of connect request |
2203 | * | |
2204 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2205 | * |
2206 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2207 | * to guarantee that even unprivileged user processes can set up a | |
2208 | * socket on a privileged port. | |
2209 | * | |
2210 | * If a UDP socket connect fails, the delay behavior here prevents | |
2211 | * retry floods (hard mounts). | |
9903cd1c | 2212 | */ |
1b092092 | 2213 | static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
a246b010 | 2214 | { |
ee0ac0c2 | 2215 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2216 | |
718ba5b8 TM |
2217 | WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); |
2218 | ||
de84d890 TM |
2219 | /* Start by resetting any existing state */ |
2220 | xs_reset_transport(transport); | |
2221 | ||
09a21c41 | 2222 | if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
46121cf7 CL |
2223 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2224 | "seconds\n", | |
03bf4b70 | 2225 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
2226 | queue_delayed_work(rpciod_workqueue, |
2227 | &transport->connect_worker, | |
2228 | xprt->reestablish_timeout); | |
03bf4b70 | 2229 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2230 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2231 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2232 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2233 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2234 | } else { |
46121cf7 | 2235 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2236 | queue_delayed_work(rpciod_workqueue, |
2237 | &transport->connect_worker, 0); | |
a246b010 CL |
2238 | } |
2239 | } | |
2240 | ||
176e21ee CL |
2241 | /** |
2242 | * xs_local_print_stats - display AF_LOCAL socket-specifc stats | |
2243 | * @xprt: rpc_xprt struct containing statistics | |
2244 | * @seq: output file | |
2245 | * | |
2246 | */ | |
2247 | static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2248 | { | |
2249 | long idle_time = 0; | |
2250 | ||
2251 | if (xprt_connected(xprt)) | |
2252 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2253 | ||
2254 | seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " | |
15a45206 | 2255 | "%llu %llu %lu %llu %llu\n", |
176e21ee CL |
2256 | xprt->stat.bind_count, |
2257 | xprt->stat.connect_count, | |
2258 | xprt->stat.connect_time, | |
2259 | idle_time, | |
2260 | xprt->stat.sends, | |
2261 | xprt->stat.recvs, | |
2262 | xprt->stat.bad_xids, | |
2263 | xprt->stat.req_u, | |
15a45206 AA |
2264 | xprt->stat.bklog_u, |
2265 | xprt->stat.max_slots, | |
2266 | xprt->stat.sending_u, | |
2267 | xprt->stat.pending_u); | |
176e21ee CL |
2268 | } |
2269 | ||
262ca07d CL |
2270 | /** |
2271 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2272 | * @xprt: rpc_xprt struct containing statistics | |
2273 | * @seq: output file | |
2274 | * | |
2275 | */ | |
2276 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2277 | { | |
c8475461 CL |
2278 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2279 | ||
15a45206 AA |
2280 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " |
2281 | "%lu %llu %llu\n", | |
fbfffbd5 | 2282 | transport->srcport, |
262ca07d CL |
2283 | xprt->stat.bind_count, |
2284 | xprt->stat.sends, | |
2285 | xprt->stat.recvs, | |
2286 | xprt->stat.bad_xids, | |
2287 | xprt->stat.req_u, | |
15a45206 AA |
2288 | xprt->stat.bklog_u, |
2289 | xprt->stat.max_slots, | |
2290 | xprt->stat.sending_u, | |
2291 | xprt->stat.pending_u); | |
262ca07d CL |
2292 | } |
2293 | ||
2294 | /** | |
2295 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2296 | * @xprt: rpc_xprt struct containing statistics | |
2297 | * @seq: output file | |
2298 | * | |
2299 | */ | |
2300 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2301 | { | |
c8475461 | 2302 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2303 | long idle_time = 0; |
2304 | ||
2305 | if (xprt_connected(xprt)) | |
2306 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2307 | ||
15a45206 AA |
2308 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " |
2309 | "%llu %llu %lu %llu %llu\n", | |
fbfffbd5 | 2310 | transport->srcport, |
262ca07d CL |
2311 | xprt->stat.bind_count, |
2312 | xprt->stat.connect_count, | |
2313 | xprt->stat.connect_time, | |
2314 | idle_time, | |
2315 | xprt->stat.sends, | |
2316 | xprt->stat.recvs, | |
2317 | xprt->stat.bad_xids, | |
2318 | xprt->stat.req_u, | |
15a45206 AA |
2319 | xprt->stat.bklog_u, |
2320 | xprt->stat.max_slots, | |
2321 | xprt->stat.sending_u, | |
2322 | xprt->stat.pending_u); | |
262ca07d CL |
2323 | } |
2324 | ||
4cfc7e60 RI |
2325 | /* |
2326 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2327 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2328 | * to use the server side send routines. | |
2329 | */ | |
5a51f13a | 2330 | static void *bc_malloc(struct rpc_task *task, size_t size) |
4cfc7e60 RI |
2331 | { |
2332 | struct page *page; | |
2333 | struct rpc_buffer *buf; | |
2334 | ||
b8a13d03 WAA |
2335 | WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); |
2336 | if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) | |
2337 | return NULL; | |
4cfc7e60 | 2338 | |
b8a13d03 | 2339 | page = alloc_page(GFP_KERNEL); |
4cfc7e60 RI |
2340 | if (!page) |
2341 | return NULL; | |
2342 | ||
2343 | buf = page_address(page); | |
2344 | buf->len = PAGE_SIZE; | |
2345 | ||
2346 | return buf->data; | |
2347 | } | |
2348 | ||
2349 | /* | |
2350 | * Free the space allocated in the bc_alloc routine | |
2351 | */ | |
5a51f13a | 2352 | static void bc_free(void *buffer) |
4cfc7e60 RI |
2353 | { |
2354 | struct rpc_buffer *buf; | |
2355 | ||
2356 | if (!buffer) | |
2357 | return; | |
2358 | ||
2359 | buf = container_of(buffer, struct rpc_buffer, data); | |
2360 | free_page((unsigned long)buf); | |
2361 | } | |
2362 | ||
2363 | /* | |
2364 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2365 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2366 | */ | |
2367 | static int bc_sendto(struct rpc_rqst *req) | |
2368 | { | |
2369 | int len; | |
2370 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2371 | struct rpc_xprt *xprt = req->rq_xprt; | |
2372 | struct sock_xprt *transport = | |
2373 | container_of(xprt, struct sock_xprt, xprt); | |
2374 | struct socket *sock = transport->sock; | |
2375 | unsigned long headoff; | |
2376 | unsigned long tailoff; | |
2377 | ||
61677eee | 2378 | xs_encode_stream_record_marker(xbufp); |
4cfc7e60 RI |
2379 | |
2380 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2381 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2382 | len = svc_send_common(sock, xbufp, | |
2383 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2384 | xbufp->tail[0].iov_base, tailoff); | |
2385 | ||
2386 | if (len != xbufp->len) { | |
2387 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2388 | len = -EAGAIN; | |
2389 | } | |
2390 | ||
2391 | return len; | |
2392 | } | |
2393 | ||
2394 | /* | |
2395 | * The send routine. Borrows from svc_send | |
2396 | */ | |
2397 | static int bc_send_request(struct rpc_task *task) | |
2398 | { | |
2399 | struct rpc_rqst *req = task->tk_rqstp; | |
2400 | struct svc_xprt *xprt; | |
4cfc7e60 RI |
2401 | u32 len; |
2402 | ||
2403 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2404 | /* | |
2405 | * Get the server socket associated with this callback xprt | |
2406 | */ | |
2407 | xprt = req->rq_xprt->bc_xprt; | |
4cfc7e60 RI |
2408 | |
2409 | /* | |
2410 | * Grab the mutex to serialize data as the connection is shared | |
2411 | * with the fore channel | |
2412 | */ | |
2413 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2414 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2415 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2416 | return -EAGAIN; | |
2417 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2418 | } | |
2419 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2420 | len = -ENOTCONN; | |
2421 | else | |
2422 | len = bc_sendto(req); | |
2423 | mutex_unlock(&xprt->xpt_mutex); | |
2424 | ||
2425 | if (len > 0) | |
2426 | len = 0; | |
2427 | ||
2428 | return len; | |
2429 | } | |
2430 | ||
2431 | /* | |
2432 | * The close routine. Since this is client initiated, we do nothing | |
2433 | */ | |
2434 | ||
2435 | static void bc_close(struct rpc_xprt *xprt) | |
2436 | { | |
4cfc7e60 RI |
2437 | } |
2438 | ||
2439 | /* | |
2440 | * The xprt destroy routine. Again, because this connection is client | |
2441 | * initiated, we do nothing | |
2442 | */ | |
2443 | ||
2444 | static void bc_destroy(struct rpc_xprt *xprt) | |
2445 | { | |
47f72efa KM |
2446 | dprintk("RPC: bc_destroy xprt %p\n", xprt); |
2447 | ||
2448 | xs_xprt_free(xprt); | |
2449 | module_put(THIS_MODULE); | |
4cfc7e60 RI |
2450 | } |
2451 | ||
176e21ee CL |
2452 | static struct rpc_xprt_ops xs_local_ops = { |
2453 | .reserve_xprt = xprt_reserve_xprt, | |
2454 | .release_xprt = xs_tcp_release_xprt, | |
f39c1bfb | 2455 | .alloc_slot = xprt_alloc_slot, |
176e21ee CL |
2456 | .rpcbind = xs_local_rpcbind, |
2457 | .set_port = xs_local_set_port, | |
dc107402 | 2458 | .connect = xs_local_connect, |
176e21ee CL |
2459 | .buf_alloc = rpc_malloc, |
2460 | .buf_free = rpc_free, | |
2461 | .send_request = xs_local_send_request, | |
2462 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2463 | .close = xs_close, | |
a1311d87 | 2464 | .destroy = xs_destroy, |
176e21ee CL |
2465 | .print_stats = xs_local_print_stats, |
2466 | }; | |
2467 | ||
262965f5 | 2468 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2469 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2470 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2471 | .release_xprt = xprt_release_xprt_cong, |
f39c1bfb | 2472 | .alloc_slot = xprt_alloc_slot, |
45160d62 | 2473 | .rpcbind = rpcb_getport_async, |
92200412 | 2474 | .set_port = xs_set_port, |
262965f5 | 2475 | .connect = xs_connect, |
02107148 CL |
2476 | .buf_alloc = rpc_malloc, |
2477 | .buf_free = rpc_free, | |
262965f5 | 2478 | .send_request = xs_udp_send_request, |
fe3aca29 | 2479 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2480 | .timer = xs_udp_timer, |
a58dd398 | 2481 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2482 | .close = xs_close, |
2483 | .destroy = xs_destroy, | |
262ca07d | 2484 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
2485 | }; |
2486 | ||
2487 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2488 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2489 | .release_xprt = xs_tcp_release_xprt, |
f39c1bfb | 2490 | .alloc_slot = xprt_lock_and_alloc_slot, |
45160d62 | 2491 | .rpcbind = rpcb_getport_async, |
92200412 | 2492 | .set_port = xs_set_port, |
0b9e7943 | 2493 | .connect = xs_connect, |
02107148 CL |
2494 | .buf_alloc = rpc_malloc, |
2495 | .buf_free = rpc_free, | |
262965f5 | 2496 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2497 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
c627d31b | 2498 | .close = xs_tcp_shutdown, |
9903cd1c | 2499 | .destroy = xs_destroy, |
262ca07d | 2500 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
2501 | }; |
2502 | ||
4cfc7e60 RI |
2503 | /* |
2504 | * The rpc_xprt_ops for the server backchannel | |
2505 | */ | |
2506 | ||
2507 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2508 | .reserve_xprt = xprt_reserve_xprt, | |
2509 | .release_xprt = xprt_release_xprt, | |
84e28a30 | 2510 | .alloc_slot = xprt_alloc_slot, |
4cfc7e60 RI |
2511 | .buf_alloc = bc_malloc, |
2512 | .buf_free = bc_free, | |
2513 | .send_request = bc_send_request, | |
2514 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2515 | .close = bc_close, | |
2516 | .destroy = bc_destroy, | |
2517 | .print_stats = xs_tcp_print_stats, | |
2518 | }; | |
2519 | ||
92476850 CL |
2520 | static int xs_init_anyaddr(const int family, struct sockaddr *sap) |
2521 | { | |
2522 | static const struct sockaddr_in sin = { | |
2523 | .sin_family = AF_INET, | |
2524 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
2525 | }; | |
2526 | static const struct sockaddr_in6 sin6 = { | |
2527 | .sin6_family = AF_INET6, | |
2528 | .sin6_addr = IN6ADDR_ANY_INIT, | |
2529 | }; | |
2530 | ||
2531 | switch (family) { | |
176e21ee CL |
2532 | case AF_LOCAL: |
2533 | break; | |
92476850 CL |
2534 | case AF_INET: |
2535 | memcpy(sap, &sin, sizeof(sin)); | |
2536 | break; | |
2537 | case AF_INET6: | |
2538 | memcpy(sap, &sin6, sizeof(sin6)); | |
2539 | break; | |
2540 | default: | |
2541 | dprintk("RPC: %s: Bad address family\n", __func__); | |
2542 | return -EAFNOSUPPORT; | |
2543 | } | |
2544 | return 0; | |
2545 | } | |
2546 | ||
3c341b0b | 2547 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
d9ba131d TM |
2548 | unsigned int slot_table_size, |
2549 | unsigned int max_slot_table_size) | |
c8541ecd CL |
2550 | { |
2551 | struct rpc_xprt *xprt; | |
ffc2e518 | 2552 | struct sock_xprt *new; |
c8541ecd | 2553 | |
96802a09 | 2554 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2555 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2556 | return ERR_PTR(-EBADF); |
2557 | } | |
2558 | ||
d9ba131d TM |
2559 | xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, |
2560 | max_slot_table_size); | |
bd1722d4 | 2561 | if (xprt == NULL) { |
46121cf7 CL |
2562 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2563 | "rpc_xprt\n"); | |
c8541ecd CL |
2564 | return ERR_PTR(-ENOMEM); |
2565 | } | |
c8541ecd | 2566 | |
bd1722d4 | 2567 | new = container_of(xprt, struct sock_xprt, xprt); |
96802a09 FM |
2568 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2569 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2570 | if (args->srcaddr) |
fbfffbd5 | 2571 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
92476850 CL |
2572 | else { |
2573 | int err; | |
2574 | err = xs_init_anyaddr(args->dstaddr->sa_family, | |
2575 | (struct sockaddr *)&new->srcaddr); | |
2aa13531 SK |
2576 | if (err != 0) { |
2577 | xprt_free(xprt); | |
92476850 | 2578 | return ERR_PTR(err); |
2aa13531 | 2579 | } |
92476850 | 2580 | } |
c8541ecd CL |
2581 | |
2582 | return xprt; | |
2583 | } | |
2584 | ||
176e21ee CL |
2585 | static const struct rpc_timeout xs_local_default_timeout = { |
2586 | .to_initval = 10 * HZ, | |
2587 | .to_maxval = 10 * HZ, | |
2588 | .to_retries = 2, | |
2589 | }; | |
2590 | ||
2591 | /** | |
2592 | * xs_setup_local - Set up transport to use an AF_LOCAL socket | |
2593 | * @args: rpc transport creation arguments | |
2594 | * | |
2595 | * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP | |
2596 | */ | |
2597 | static struct rpc_xprt *xs_setup_local(struct xprt_create *args) | |
2598 | { | |
2599 | struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; | |
2600 | struct sock_xprt *transport; | |
2601 | struct rpc_xprt *xprt; | |
2602 | struct rpc_xprt *ret; | |
2603 | ||
d9ba131d TM |
2604 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2605 | xprt_max_tcp_slot_table_entries); | |
176e21ee CL |
2606 | if (IS_ERR(xprt)) |
2607 | return xprt; | |
2608 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2609 | ||
2610 | xprt->prot = 0; | |
2611 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2612 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2613 | ||
2614 | xprt->bind_timeout = XS_BIND_TO; | |
2615 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2616 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
2617 | ||
2618 | xprt->ops = &xs_local_ops; | |
2619 | xprt->timeout = &xs_local_default_timeout; | |
2620 | ||
93dc41bd N |
2621 | INIT_DELAYED_WORK(&transport->connect_worker, |
2622 | xs_dummy_setup_socket); | |
2623 | ||
176e21ee CL |
2624 | switch (sun->sun_family) { |
2625 | case AF_LOCAL: | |
2626 | if (sun->sun_path[0] != '/') { | |
2627 | dprintk("RPC: bad AF_LOCAL address: %s\n", | |
2628 | sun->sun_path); | |
2629 | ret = ERR_PTR(-EINVAL); | |
2630 | goto out_err; | |
2631 | } | |
2632 | xprt_set_bound(xprt); | |
176e21ee | 2633 | xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); |
7073ea87 BF |
2634 | ret = ERR_PTR(xs_local_setup_socket(transport)); |
2635 | if (ret) | |
2636 | goto out_err; | |
176e21ee CL |
2637 | break; |
2638 | default: | |
2639 | ret = ERR_PTR(-EAFNOSUPPORT); | |
2640 | goto out_err; | |
2641 | } | |
2642 | ||
2643 | dprintk("RPC: set up xprt to %s via AF_LOCAL\n", | |
2644 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2645 | ||
2646 | if (try_module_get(THIS_MODULE)) | |
2647 | return xprt; | |
2648 | ret = ERR_PTR(-EINVAL); | |
2649 | out_err: | |
315f3812 | 2650 | xs_xprt_free(xprt); |
176e21ee CL |
2651 | return ret; |
2652 | } | |
2653 | ||
2881ae74 TM |
2654 | static const struct rpc_timeout xs_udp_default_timeout = { |
2655 | .to_initval = 5 * HZ, | |
2656 | .to_maxval = 30 * HZ, | |
2657 | .to_increment = 5 * HZ, | |
2658 | .to_retries = 5, | |
2659 | }; | |
2660 | ||
9903cd1c CL |
2661 | /** |
2662 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2663 | * @args: rpc transport creation arguments |
9903cd1c CL |
2664 | * |
2665 | */ | |
483066d6 | 2666 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2667 | { |
8f9d5b1a | 2668 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2669 | struct rpc_xprt *xprt; |
c8475461 | 2670 | struct sock_xprt *transport; |
0a68b0be | 2671 | struct rpc_xprt *ret; |
a246b010 | 2672 | |
d9ba131d TM |
2673 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, |
2674 | xprt_udp_slot_table_entries); | |
c8541ecd CL |
2675 | if (IS_ERR(xprt)) |
2676 | return xprt; | |
c8475461 | 2677 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2678 | |
ec739ef0 | 2679 | xprt->prot = IPPROTO_UDP; |
808012fb | 2680 | xprt->tsh_size = 0; |
a246b010 CL |
2681 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2682 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2683 | ||
03bf4b70 | 2684 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2685 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2686 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2687 | |
262965f5 | 2688 | xprt->ops = &xs_udp_ops; |
a246b010 | 2689 | |
ba7392bb | 2690 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2691 | |
8f9d5b1a CL |
2692 | switch (addr->sa_family) { |
2693 | case AF_INET: | |
2694 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2695 | xprt_set_bound(xprt); | |
2696 | ||
2697 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2698 | xs_udp_setup_socket); |
9dc3b095 | 2699 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2700 | break; |
2701 | case AF_INET6: | |
2702 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2703 | xprt_set_bound(xprt); | |
2704 | ||
2705 | INIT_DELAYED_WORK(&transport->connect_worker, | |
8c14ff2a | 2706 | xs_udp_setup_socket); |
9dc3b095 | 2707 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2708 | break; |
2709 | default: | |
0a68b0be BF |
2710 | ret = ERR_PTR(-EAFNOSUPPORT); |
2711 | goto out_err; | |
8f9d5b1a CL |
2712 | } |
2713 | ||
c740eff8 CL |
2714 | if (xprt_bound(xprt)) |
2715 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2716 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2717 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2718 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2719 | else | |
2720 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2721 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2722 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2723 | |
bc25571e TT |
2724 | if (try_module_get(THIS_MODULE)) |
2725 | return xprt; | |
0a68b0be BF |
2726 | ret = ERR_PTR(-EINVAL); |
2727 | out_err: | |
315f3812 | 2728 | xs_xprt_free(xprt); |
0a68b0be | 2729 | return ret; |
a246b010 CL |
2730 | } |
2731 | ||
2881ae74 TM |
2732 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2733 | .to_initval = 60 * HZ, | |
2734 | .to_maxval = 60 * HZ, | |
2735 | .to_retries = 2, | |
2736 | }; | |
2737 | ||
9903cd1c CL |
2738 | /** |
2739 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2740 | * @args: rpc transport creation arguments |
9903cd1c CL |
2741 | * |
2742 | */ | |
483066d6 | 2743 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2744 | { |
8f9d5b1a | 2745 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2746 | struct rpc_xprt *xprt; |
c8475461 | 2747 | struct sock_xprt *transport; |
0a68b0be | 2748 | struct rpc_xprt *ret; |
b7993ceb TM |
2749 | unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; |
2750 | ||
2751 | if (args->flags & XPRT_CREATE_INFINITE_SLOTS) | |
2752 | max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; | |
a246b010 | 2753 | |
d9ba131d | 2754 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
b7993ceb | 2755 | max_slot_table_size); |
c8541ecd CL |
2756 | if (IS_ERR(xprt)) |
2757 | return xprt; | |
c8475461 | 2758 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2759 | |
ec739ef0 | 2760 | xprt->prot = IPPROTO_TCP; |
808012fb | 2761 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2762 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2763 | |
03bf4b70 | 2764 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2765 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2766 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2767 | |
262965f5 | 2768 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2769 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2770 | |
8f9d5b1a CL |
2771 | switch (addr->sa_family) { |
2772 | case AF_INET: | |
2773 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2774 | xprt_set_bound(xprt); | |
2775 | ||
9dc3b095 | 2776 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2777 | xs_tcp_setup_socket); |
9dc3b095 | 2778 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2779 | break; |
2780 | case AF_INET6: | |
2781 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2782 | xprt_set_bound(xprt); | |
2783 | ||
9dc3b095 | 2784 | INIT_DELAYED_WORK(&transport->connect_worker, |
cdd518d5 | 2785 | xs_tcp_setup_socket); |
9dc3b095 | 2786 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2787 | break; |
2788 | default: | |
0a68b0be BF |
2789 | ret = ERR_PTR(-EAFNOSUPPORT); |
2790 | goto out_err; | |
8f9d5b1a CL |
2791 | } |
2792 | ||
c740eff8 CL |
2793 | if (xprt_bound(xprt)) |
2794 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2795 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2796 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2797 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2798 | else | |
2799 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2800 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2801 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2802 | ||
bc25571e TT |
2803 | if (try_module_get(THIS_MODULE)) |
2804 | return xprt; | |
0a68b0be BF |
2805 | ret = ERR_PTR(-EINVAL); |
2806 | out_err: | |
315f3812 | 2807 | xs_xprt_free(xprt); |
0a68b0be | 2808 | return ret; |
a246b010 | 2809 | } |
282b32e1 | 2810 | |
f300baba AB |
2811 | /** |
2812 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2813 | * @args: rpc transport creation arguments | |
2814 | * | |
2815 | */ | |
2816 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2817 | { | |
2818 | struct sockaddr *addr = args->dstaddr; | |
2819 | struct rpc_xprt *xprt; | |
2820 | struct sock_xprt *transport; | |
2821 | struct svc_sock *bc_sock; | |
0a68b0be | 2822 | struct rpc_xprt *ret; |
f300baba | 2823 | |
d9ba131d TM |
2824 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2825 | xprt_tcp_slot_table_entries); | |
f300baba AB |
2826 | if (IS_ERR(xprt)) |
2827 | return xprt; | |
2828 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2829 | ||
2830 | xprt->prot = IPPROTO_TCP; | |
2831 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2832 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2833 | xprt->timeout = &xs_tcp_default_timeout; | |
2834 | ||
2835 | /* backchannel */ | |
2836 | xprt_set_bound(xprt); | |
2837 | xprt->bind_timeout = 0; | |
f300baba AB |
2838 | xprt->reestablish_timeout = 0; |
2839 | xprt->idle_timeout = 0; | |
2840 | ||
f300baba AB |
2841 | xprt->ops = &bc_tcp_ops; |
2842 | ||
2843 | switch (addr->sa_family) { | |
2844 | case AF_INET: | |
2845 | xs_format_peer_addresses(xprt, "tcp", | |
2846 | RPCBIND_NETID_TCP); | |
2847 | break; | |
2848 | case AF_INET6: | |
2849 | xs_format_peer_addresses(xprt, "tcp", | |
2850 | RPCBIND_NETID_TCP6); | |
2851 | break; | |
2852 | default: | |
0a68b0be BF |
2853 | ret = ERR_PTR(-EAFNOSUPPORT); |
2854 | goto out_err; | |
f300baba AB |
2855 | } |
2856 | ||
50fa0d40 PE |
2857 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
2858 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2859 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2860 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
f300baba | 2861 | |
99de8ea9 BF |
2862 | /* |
2863 | * Once we've associated a backchannel xprt with a connection, | |
28303ca3 WM |
2864 | * we want to keep it around as long as the connection lasts, |
2865 | * in case we need to start using it for a backchannel again; | |
2866 | * this reference won't be dropped until bc_xprt is destroyed. | |
99de8ea9 BF |
2867 | */ |
2868 | xprt_get(xprt); | |
2869 | args->bc_xprt->xpt_bc_xprt = xprt; | |
2870 | xprt->bc_xprt = args->bc_xprt; | |
2871 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
2872 | transport->sock = bc_sock->sk_sock; | |
2873 | transport->inet = bc_sock->sk_sk; | |
2874 | ||
f300baba AB |
2875 | /* |
2876 | * Since we don't want connections for the backchannel, we set | |
2877 | * the xprt status to connected | |
2878 | */ | |
2879 | xprt_set_connected(xprt); | |
2880 | ||
f300baba AB |
2881 | if (try_module_get(THIS_MODULE)) |
2882 | return xprt; | |
642aab58 KM |
2883 | |
2884 | args->bc_xprt->xpt_bc_xprt = NULL; | |
99de8ea9 | 2885 | xprt_put(xprt); |
0a68b0be BF |
2886 | ret = ERR_PTR(-EINVAL); |
2887 | out_err: | |
315f3812 | 2888 | xs_xprt_free(xprt); |
0a68b0be | 2889 | return ret; |
f300baba AB |
2890 | } |
2891 | ||
176e21ee CL |
2892 | static struct xprt_class xs_local_transport = { |
2893 | .list = LIST_HEAD_INIT(xs_local_transport.list), | |
2894 | .name = "named UNIX socket", | |
2895 | .owner = THIS_MODULE, | |
2896 | .ident = XPRT_TRANSPORT_LOCAL, | |
2897 | .setup = xs_setup_local, | |
2898 | }; | |
2899 | ||
bc25571e TT |
2900 | static struct xprt_class xs_udp_transport = { |
2901 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
2902 | .name = "udp", | |
2903 | .owner = THIS_MODULE, | |
f300baba | 2904 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
2905 | .setup = xs_setup_udp, |
2906 | }; | |
2907 | ||
2908 | static struct xprt_class xs_tcp_transport = { | |
2909 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
2910 | .name = "tcp", | |
2911 | .owner = THIS_MODULE, | |
f300baba | 2912 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
2913 | .setup = xs_setup_tcp, |
2914 | }; | |
2915 | ||
f300baba AB |
2916 | static struct xprt_class xs_bc_tcp_transport = { |
2917 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
2918 | .name = "tcp NFSv4.1 backchannel", | |
2919 | .owner = THIS_MODULE, | |
2920 | .ident = XPRT_TRANSPORT_BC_TCP, | |
2921 | .setup = xs_setup_bc_tcp, | |
2922 | }; | |
2923 | ||
282b32e1 | 2924 | /** |
bc25571e | 2925 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
2926 | * |
2927 | */ | |
2928 | int init_socket_xprt(void) | |
2929 | { | |
f895b252 | 2930 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
2b1bec5f | 2931 | if (!sunrpc_table_header) |
0b4d4147 | 2932 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
2933 | #endif |
2934 | ||
176e21ee | 2935 | xprt_register_transport(&xs_local_transport); |
bc25571e TT |
2936 | xprt_register_transport(&xs_udp_transport); |
2937 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 2938 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 2939 | |
282b32e1 CL |
2940 | return 0; |
2941 | } | |
2942 | ||
2943 | /** | |
bc25571e | 2944 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
2945 | * |
2946 | */ | |
2947 | void cleanup_socket_xprt(void) | |
2948 | { | |
f895b252 | 2949 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
fbf76683 CL |
2950 | if (sunrpc_table_header) { |
2951 | unregister_sysctl_table(sunrpc_table_header); | |
2952 | sunrpc_table_header = NULL; | |
2953 | } | |
2954 | #endif | |
bc25571e | 2955 | |
176e21ee | 2956 | xprt_unregister_transport(&xs_local_transport); |
bc25571e TT |
2957 | xprt_unregister_transport(&xs_udp_transport); |
2958 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 2959 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 2960 | } |
cbf11071 | 2961 | |
9bbb9e5a RR |
2962 | static int param_set_uint_minmax(const char *val, |
2963 | const struct kernel_param *kp, | |
cbf11071 TM |
2964 | unsigned int min, unsigned int max) |
2965 | { | |
00cfaa94 | 2966 | unsigned int num; |
cbf11071 TM |
2967 | int ret; |
2968 | ||
2969 | if (!val) | |
2970 | return -EINVAL; | |
00cfaa94 | 2971 | ret = kstrtouint(val, 0, &num); |
cbf11071 TM |
2972 | if (ret == -EINVAL || num < min || num > max) |
2973 | return -EINVAL; | |
2974 | *((unsigned int *)kp->arg) = num; | |
2975 | return 0; | |
2976 | } | |
2977 | ||
9bbb9e5a | 2978 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
cbf11071 TM |
2979 | { |
2980 | return param_set_uint_minmax(val, kp, | |
2981 | RPC_MIN_RESVPORT, | |
2982 | RPC_MAX_RESVPORT); | |
2983 | } | |
2984 | ||
9bbb9e5a RR |
2985 | static struct kernel_param_ops param_ops_portnr = { |
2986 | .set = param_set_portnr, | |
2987 | .get = param_get_uint, | |
2988 | }; | |
2989 | ||
cbf11071 TM |
2990 | #define param_check_portnr(name, p) \ |
2991 | __param_check(name, p, unsigned int); | |
2992 | ||
2993 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
2994 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
2995 | ||
9bbb9e5a RR |
2996 | static int param_set_slot_table_size(const char *val, |
2997 | const struct kernel_param *kp) | |
cbf11071 TM |
2998 | { |
2999 | return param_set_uint_minmax(val, kp, | |
3000 | RPC_MIN_SLOT_TABLE, | |
3001 | RPC_MAX_SLOT_TABLE); | |
3002 | } | |
3003 | ||
9bbb9e5a RR |
3004 | static struct kernel_param_ops param_ops_slot_table_size = { |
3005 | .set = param_set_slot_table_size, | |
3006 | .get = param_get_uint, | |
3007 | }; | |
3008 | ||
cbf11071 TM |
3009 | #define param_check_slot_table_size(name, p) \ |
3010 | __param_check(name, p, unsigned int); | |
3011 | ||
d9ba131d TM |
3012 | static int param_set_max_slot_table_size(const char *val, |
3013 | const struct kernel_param *kp) | |
3014 | { | |
3015 | return param_set_uint_minmax(val, kp, | |
3016 | RPC_MIN_SLOT_TABLE, | |
3017 | RPC_MAX_SLOT_TABLE_LIMIT); | |
3018 | } | |
3019 | ||
3020 | static struct kernel_param_ops param_ops_max_slot_table_size = { | |
3021 | .set = param_set_max_slot_table_size, | |
3022 | .get = param_get_uint, | |
3023 | }; | |
3024 | ||
3025 | #define param_check_max_slot_table_size(name, p) \ | |
3026 | __param_check(name, p, unsigned int); | |
3027 | ||
cbf11071 TM |
3028 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
3029 | slot_table_size, 0644); | |
d9ba131d TM |
3030 | module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, |
3031 | max_slot_table_size, 0644); | |
cbf11071 TM |
3032 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
3033 | slot_table_size, 0644); | |
3034 |