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Commit | Line | Data |
---|---|---|
a246b010 CL |
1 | /* |
2 | * linux/net/sunrpc/xprtsock.c | |
3 | * | |
4 | * Client-side transport implementation for sockets. | |
5 | * | |
113aa838 AC |
6 | * TCP callback races fixes (C) 1998 Red Hat |
7 | * TCP send fixes (C) 1998 Red Hat | |
a246b010 CL |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> | |
10 | * | |
11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. | |
12 | * Fix behaviour when socket buffer is full. | |
13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
176e21ee | 22 | #include <linux/string.h> |
a246b010 | 23 | #include <linux/slab.h> |
bc25571e | 24 | #include <linux/module.h> |
a246b010 | 25 | #include <linux/capability.h> |
a246b010 CL |
26 | #include <linux/pagemap.h> |
27 | #include <linux/errno.h> | |
28 | #include <linux/socket.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/mm.h> | |
176e21ee | 32 | #include <linux/un.h> |
a246b010 CL |
33 | #include <linux/udp.h> |
34 | #include <linux/tcp.h> | |
35 | #include <linux/sunrpc/clnt.h> | |
5976687a | 36 | #include <linux/sunrpc/addr.h> |
02107148 | 37 | #include <linux/sunrpc/sched.h> |
4cfc7e60 | 38 | #include <linux/sunrpc/svcsock.h> |
49c36fcc | 39 | #include <linux/sunrpc/xprtsock.h> |
a246b010 | 40 | #include <linux/file.h> |
9e00abc3 | 41 | #ifdef CONFIG_SUNRPC_BACKCHANNEL |
44b98efd RL |
42 | #include <linux/sunrpc/bc_xprt.h> |
43 | #endif | |
a246b010 CL |
44 | |
45 | #include <net/sock.h> | |
46 | #include <net/checksum.h> | |
47 | #include <net/udp.h> | |
48 | #include <net/tcp.h> | |
49 | ||
40b5ea0c TM |
50 | #include <trace/events/sunrpc.h> |
51 | ||
4cfc7e60 | 52 | #include "sunrpc.h" |
176e21ee CL |
53 | |
54 | static void xs_close(struct rpc_xprt *xprt); | |
55 | ||
c556b754 CL |
56 | /* |
57 | * xprtsock tunables | |
58 | */ | |
09acfea5 TM |
59 | static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
60 | static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; | |
61 | static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; | |
c556b754 | 62 | |
09acfea5 TM |
63 | static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; |
64 | static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
c556b754 | 65 | |
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 | 362 | remainder -= len; |
31303d6c | 363 | if (more) |
24c5684b | 364 | flags |= MSG_MORE; |
31303d6c TM |
365 | if (remainder != 0) |
366 | flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE; | |
a6b31d18 | 367 | err = do_sendpage(sock, *ppage, base, len, flags); |
24c5684b TM |
368 | if (remainder == 0 || err != len) |
369 | break; | |
f279cd00 | 370 | *sent_p += err; |
24c5684b TM |
371 | ppage++; |
372 | base = 0; | |
373 | } | |
f279cd00 JB |
374 | if (err > 0) { |
375 | *sent_p += err; | |
376 | err = 0; | |
377 | } | |
378 | return err; | |
b4b5cc85 CL |
379 | } |
380 | ||
9903cd1c CL |
381 | /** |
382 | * xs_sendpages - write pages directly to a socket | |
383 | * @sock: socket to send on | |
384 | * @addr: UDP only -- address of destination | |
385 | * @addrlen: UDP only -- length of destination address | |
386 | * @xdr: buffer containing this request | |
387 | * @base: starting position in the buffer | |
a6b31d18 | 388 | * @zerocopy: true if it is safe to use sendpage() |
f279cd00 | 389 | * @sent_p: return the total number of bytes successfully queued for sending |
9903cd1c | 390 | * |
a246b010 | 391 | */ |
f279cd00 | 392 | 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 | 393 | { |
24c5684b | 394 | unsigned int remainder = xdr->len - base; |
f279cd00 JB |
395 | int err = 0; |
396 | int sent = 0; | |
a246b010 | 397 | |
262965f5 | 398 | if (unlikely(!sock)) |
fba91afb | 399 | return -ENOTSOCK; |
262965f5 | 400 | |
9cd3e072 | 401 | clear_bit(SOCKWQ_ASYNC_NOSPACE, &sock->flags); |
24c5684b TM |
402 | if (base != 0) { |
403 | addr = NULL; | |
404 | addrlen = 0; | |
405 | } | |
262965f5 | 406 | |
24c5684b TM |
407 | if (base < xdr->head[0].iov_len || addr != NULL) { |
408 | unsigned int len = xdr->head[0].iov_len - base; | |
409 | remainder -= len; | |
410 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
411 | if (remainder == 0 || err != len) | |
a246b010 | 412 | goto out; |
f279cd00 | 413 | *sent_p += err; |
a246b010 CL |
414 | base = 0; |
415 | } else | |
24c5684b | 416 | base -= xdr->head[0].iov_len; |
a246b010 | 417 | |
24c5684b TM |
418 | if (base < xdr->page_len) { |
419 | unsigned int len = xdr->page_len - base; | |
420 | remainder -= len; | |
f279cd00 JB |
421 | err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent); |
422 | *sent_p += sent; | |
423 | if (remainder == 0 || sent != len) | |
a246b010 CL |
424 | goto out; |
425 | base = 0; | |
24c5684b TM |
426 | } else |
427 | base -= xdr->page_len; | |
428 | ||
429 | if (base >= xdr->tail[0].iov_len) | |
f279cd00 | 430 | return 0; |
24c5684b | 431 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); |
a246b010 | 432 | out: |
f279cd00 JB |
433 | if (err > 0) { |
434 | *sent_p += err; | |
435 | err = 0; | |
436 | } | |
437 | return err; | |
a246b010 CL |
438 | } |
439 | ||
b6ddf64f TM |
440 | static void xs_nospace_callback(struct rpc_task *task) |
441 | { | |
442 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
443 | ||
444 | transport->inet->sk_write_pending--; | |
9cd3e072 | 445 | clear_bit(SOCKWQ_ASYNC_NOSPACE, &transport->sock->flags); |
b6ddf64f TM |
446 | } |
447 | ||
9903cd1c | 448 | /** |
262965f5 CL |
449 | * xs_nospace - place task on wait queue if transmit was incomplete |
450 | * @task: task to put to sleep | |
9903cd1c | 451 | * |
a246b010 | 452 | */ |
5e3771ce | 453 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 454 | { |
262965f5 CL |
455 | struct rpc_rqst *req = task->tk_rqstp; |
456 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 457 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
06ea0bfe | 458 | struct sock *sk = transport->inet; |
24ca9a84 | 459 | int ret = -EAGAIN; |
a246b010 | 460 | |
46121cf7 | 461 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
462 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
463 | req->rq_slen); | |
464 | ||
b6ddf64f TM |
465 | /* Protect against races with write_space */ |
466 | spin_lock_bh(&xprt->transport_lock); | |
467 | ||
468 | /* Don't race with disconnect */ | |
469 | if (xprt_connected(xprt)) { | |
9cd3e072 | 470 | if (test_bit(SOCKWQ_ASYNC_NOSPACE, &transport->sock->flags)) { |
b6ddf64f TM |
471 | /* |
472 | * Notify TCP that we're limited by the application | |
473 | * window size | |
474 | */ | |
475 | set_bit(SOCK_NOSPACE, &transport->sock->flags); | |
06ea0bfe | 476 | sk->sk_write_pending++; |
b6ddf64f TM |
477 | /* ...and wait for more buffer space */ |
478 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
479 | } | |
480 | } else { | |
9cd3e072 | 481 | clear_bit(SOCKWQ_ASYNC_NOSPACE, &transport->sock->flags); |
5e3771ce | 482 | ret = -ENOTCONN; |
b6ddf64f | 483 | } |
262965f5 | 484 | |
b6ddf64f | 485 | spin_unlock_bh(&xprt->transport_lock); |
06ea0bfe TM |
486 | |
487 | /* Race breaker in case memory is freed before above code is called */ | |
488 | sk->sk_write_space(sk); | |
5e3771ce | 489 | return ret; |
262965f5 CL |
490 | } |
491 | ||
61677eee CL |
492 | /* |
493 | * Construct a stream transport record marker in @buf. | |
494 | */ | |
495 | static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) | |
496 | { | |
497 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
498 | rpc_fraghdr *base = buf->head[0].iov_base; | |
499 | *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); | |
500 | } | |
501 | ||
176e21ee CL |
502 | /** |
503 | * xs_local_send_request - write an RPC request to an AF_LOCAL socket | |
504 | * @task: RPC task that manages the state of an RPC request | |
505 | * | |
506 | * Return values: | |
507 | * 0: The request has been sent | |
508 | * EAGAIN: The socket was blocked, please call again later to | |
509 | * complete the request | |
510 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
511 | * other: Some other error occured, the request was not sent | |
512 | */ | |
513 | static int xs_local_send_request(struct rpc_task *task) | |
514 | { | |
515 | struct rpc_rqst *req = task->tk_rqstp; | |
516 | struct rpc_xprt *xprt = req->rq_xprt; | |
517 | struct sock_xprt *transport = | |
518 | container_of(xprt, struct sock_xprt, xprt); | |
519 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
520 | int status; | |
f279cd00 | 521 | int sent = 0; |
176e21ee CL |
522 | |
523 | xs_encode_stream_record_marker(&req->rq_snd_buf); | |
524 | ||
525 | xs_pktdump("packet data:", | |
526 | req->rq_svec->iov_base, req->rq_svec->iov_len); | |
527 | ||
f279cd00 JB |
528 | status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent, |
529 | true, &sent); | |
176e21ee CL |
530 | dprintk("RPC: %s(%u) = %d\n", |
531 | __func__, xdr->len - req->rq_bytes_sent, status); | |
743c69e7 N |
532 | |
533 | if (status == -EAGAIN && sock_writeable(transport->inet)) | |
534 | status = -ENOBUFS; | |
535 | ||
f279cd00 JB |
536 | if (likely(sent > 0) || status == 0) { |
537 | req->rq_bytes_sent += sent; | |
538 | req->rq_xmit_bytes_sent += sent; | |
176e21ee CL |
539 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
540 | req->rq_bytes_sent = 0; | |
541 | return 0; | |
542 | } | |
543 | status = -EAGAIN; | |
544 | } | |
545 | ||
546 | switch (status) { | |
3601c4a9 | 547 | case -ENOBUFS: |
b5872f0c | 548 | break; |
176e21ee CL |
549 | case -EAGAIN: |
550 | status = xs_nospace(task); | |
551 | break; | |
552 | default: | |
553 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
554 | -status); | |
555 | case -EPIPE: | |
556 | xs_close(xprt); | |
557 | status = -ENOTCONN; | |
558 | } | |
559 | ||
560 | return status; | |
561 | } | |
562 | ||
262965f5 CL |
563 | /** |
564 | * xs_udp_send_request - write an RPC request to a UDP socket | |
565 | * @task: address of RPC task that manages the state of an RPC request | |
566 | * | |
567 | * Return values: | |
568 | * 0: The request has been sent | |
569 | * EAGAIN: The socket was blocked, please call again later to | |
570 | * complete the request | |
571 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 572 | * other: Some other error occurred, the request was not sent |
262965f5 CL |
573 | */ |
574 | static int xs_udp_send_request(struct rpc_task *task) | |
575 | { | |
576 | struct rpc_rqst *req = task->tk_rqstp; | |
577 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 578 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 579 | struct xdr_buf *xdr = &req->rq_snd_buf; |
f279cd00 | 580 | int sent = 0; |
262965f5 | 581 | int status; |
a246b010 | 582 | |
9903cd1c | 583 | xs_pktdump("packet data:", |
a246b010 CL |
584 | req->rq_svec->iov_base, |
585 | req->rq_svec->iov_len); | |
586 | ||
01d37c42 TM |
587 | if (!xprt_bound(xprt)) |
588 | return -ENOTCONN; | |
f279cd00 JB |
589 | status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, |
590 | xdr, req->rq_bytes_sent, true, &sent); | |
a246b010 | 591 | |
46121cf7 | 592 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 593 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 594 | |
3dedbb5c JB |
595 | /* firewall is blocking us, don't return -EAGAIN or we end up looping */ |
596 | if (status == -EPERM) | |
597 | goto process_status; | |
598 | ||
743c69e7 N |
599 | if (status == -EAGAIN && sock_writeable(transport->inet)) |
600 | status = -ENOBUFS; | |
601 | ||
f279cd00 JB |
602 | if (sent > 0 || status == 0) { |
603 | req->rq_xmit_bytes_sent += sent; | |
604 | if (sent >= req->rq_slen) | |
2199700f TM |
605 | return 0; |
606 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 607 | status = -EAGAIN; |
2199700f | 608 | } |
a246b010 | 609 | |
3dedbb5c | 610 | process_status: |
262965f5 | 611 | switch (status) { |
fba91afb TM |
612 | case -ENOTSOCK: |
613 | status = -ENOTCONN; | |
614 | /* Should we call xs_close() here? */ | |
615 | break; | |
b6ddf64f | 616 | case -EAGAIN: |
5e3771ce | 617 | status = xs_nospace(task); |
b6ddf64f | 618 | break; |
c8485e4d TM |
619 | default: |
620 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
621 | -status); | |
262965f5 | 622 | case -ENETUNREACH: |
3601c4a9 | 623 | case -ENOBUFS: |
262965f5 | 624 | case -EPIPE: |
a246b010 | 625 | case -ECONNREFUSED: |
3dedbb5c | 626 | case -EPERM: |
a246b010 | 627 | /* When the server has died, an ICMP port unreachable message |
9903cd1c | 628 | * prompts ECONNREFUSED. */ |
9cd3e072 | 629 | clear_bit(SOCKWQ_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 630 | } |
5fe46e9d | 631 | |
262965f5 | 632 | return status; |
a246b010 CL |
633 | } |
634 | ||
9903cd1c | 635 | /** |
262965f5 | 636 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
637 | * @task: address of RPC task that manages the state of an RPC request |
638 | * | |
639 | * Return values: | |
262965f5 CL |
640 | * 0: The request has been sent |
641 | * EAGAIN: The socket was blocked, please call again later to | |
642 | * complete the request | |
643 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 644 | * other: Some other error occurred, the request was not sent |
9903cd1c CL |
645 | * |
646 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 647 | * if sendmsg is not able to make progress? |
9903cd1c | 648 | */ |
262965f5 | 649 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
650 | { |
651 | struct rpc_rqst *req = task->tk_rqstp; | |
652 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 653 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 654 | struct xdr_buf *xdr = &req->rq_snd_buf; |
a6b31d18 | 655 | bool zerocopy = true; |
b595bb15 | 656 | int status; |
f279cd00 | 657 | int sent; |
a246b010 | 658 | |
61677eee | 659 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
a246b010 | 660 | |
262965f5 CL |
661 | xs_pktdump("packet data:", |
662 | req->rq_svec->iov_base, | |
663 | req->rq_svec->iov_len); | |
a6b31d18 TM |
664 | /* Don't use zero copy if this is a resend. If the RPC call |
665 | * completes while the socket holds a reference to the pages, | |
666 | * then we may end up resending corrupted data. | |
667 | */ | |
668 | if (task->tk_flags & RPC_TASK_SENT) | |
669 | zerocopy = false; | |
a246b010 CL |
670 | |
671 | /* Continue transmitting the packet/record. We must be careful | |
672 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 673 | * called sendmsg(). */ |
a246b010 | 674 | while (1) { |
f279cd00 JB |
675 | sent = 0; |
676 | status = xs_sendpages(transport->sock, NULL, 0, xdr, | |
677 | req->rq_bytes_sent, zerocopy, &sent); | |
a246b010 | 678 | |
46121cf7 | 679 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 680 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 681 | |
262965f5 CL |
682 | /* If we've sent the entire packet, immediately |
683 | * reset the count of bytes sent. */ | |
f279cd00 JB |
684 | req->rq_bytes_sent += sent; |
685 | req->rq_xmit_bytes_sent += sent; | |
262965f5 CL |
686 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
687 | req->rq_bytes_sent = 0; | |
688 | return 0; | |
689 | } | |
a246b010 | 690 | |
f580dd04 TM |
691 | if (status < 0) |
692 | break; | |
693 | if (sent == 0) { | |
694 | status = -EAGAIN; | |
695 | break; | |
696 | } | |
a246b010 | 697 | } |
743c69e7 N |
698 | if (status == -EAGAIN && sk_stream_is_writeable(transport->inet)) |
699 | status = -ENOBUFS; | |
a246b010 | 700 | |
262965f5 | 701 | switch (status) { |
fba91afb TM |
702 | case -ENOTSOCK: |
703 | status = -ENOTCONN; | |
704 | /* Should we call xs_close() here? */ | |
705 | break; | |
262965f5 | 706 | case -EAGAIN: |
5e3771ce | 707 | status = xs_nospace(task); |
262965f5 | 708 | break; |
c8485e4d TM |
709 | default: |
710 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
711 | -status); | |
262965f5 | 712 | case -ECONNRESET: |
2a9e1cfa | 713 | case -ECONNREFUSED: |
262965f5 | 714 | case -ENOTCONN: |
3913c78c | 715 | case -EADDRINUSE: |
b5872f0c | 716 | case -ENOBUFS: |
b9d2bb2e | 717 | case -EPIPE: |
9cd3e072 | 718 | clear_bit(SOCKWQ_ASYNC_NOSPACE, &transport->sock->flags); |
a246b010 | 719 | } |
5fe46e9d | 720 | |
a246b010 CL |
721 | return status; |
722 | } | |
723 | ||
e0ab53de TM |
724 | /** |
725 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
726 | * @xprt: transport | |
727 | * @task: rpc task | |
728 | * | |
729 | * This cleans up if an error causes us to abort the transmission of a request. | |
730 | * In this case, the socket may need to be reset in order to avoid confusing | |
731 | * the server. | |
732 | */ | |
733 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
734 | { | |
735 | struct rpc_rqst *req; | |
736 | ||
737 | if (task != xprt->snd_task) | |
738 | return; | |
739 | if (task == NULL) | |
740 | goto out_release; | |
741 | req = task->tk_rqstp; | |
43cedbf0 TM |
742 | if (req == NULL) |
743 | goto out_release; | |
e0ab53de TM |
744 | if (req->rq_bytes_sent == 0) |
745 | goto out_release; | |
746 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
747 | goto out_release; | |
a4f0835c | 748 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
e0ab53de TM |
749 | out_release: |
750 | xprt_release_xprt(xprt, task); | |
751 | } | |
752 | ||
2a9e1cfa TM |
753 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
754 | { | |
755 | transport->old_data_ready = sk->sk_data_ready; | |
756 | transport->old_state_change = sk->sk_state_change; | |
757 | transport->old_write_space = sk->sk_write_space; | |
2118071d | 758 | transport->old_error_report = sk->sk_error_report; |
2a9e1cfa TM |
759 | } |
760 | ||
761 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
762 | { | |
763 | sk->sk_data_ready = transport->old_data_ready; | |
764 | sk->sk_state_change = transport->old_state_change; | |
765 | sk->sk_write_space = transport->old_write_space; | |
2118071d TM |
766 | sk->sk_error_report = transport->old_error_report; |
767 | } | |
768 | ||
b70ae915 TM |
769 | static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) |
770 | { | |
771 | smp_mb__before_atomic(); | |
772 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
773 | clear_bit(XPRT_CLOSING, &xprt->state); | |
774 | smp_mb__after_atomic(); | |
775 | } | |
776 | ||
777 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
778 | { | |
779 | xs_sock_reset_connection_flags(xprt); | |
780 | /* Mark transport as closed and wake up all pending tasks */ | |
781 | xprt_disconnect_done(xprt); | |
782 | } | |
783 | ||
2118071d TM |
784 | /** |
785 | * xs_error_report - callback to handle TCP socket state errors | |
786 | * @sk: socket | |
787 | * | |
788 | * Note: we don't call sock_error() since there may be a rpc_task | |
789 | * using the socket, and so we don't want to clear sk->sk_err. | |
790 | */ | |
791 | static void xs_error_report(struct sock *sk) | |
792 | { | |
793 | struct rpc_xprt *xprt; | |
794 | int err; | |
795 | ||
796 | read_lock_bh(&sk->sk_callback_lock); | |
797 | if (!(xprt = xprt_from_sock(sk))) | |
798 | goto out; | |
799 | ||
800 | err = -sk->sk_err; | |
801 | if (err == 0) | |
802 | goto out; | |
b70ae915 TM |
803 | /* Is this a reset event? */ |
804 | if (sk->sk_state == TCP_CLOSE) | |
805 | xs_sock_mark_closed(xprt); | |
2118071d TM |
806 | dprintk("RPC: xs_error_report client %p, error=%d...\n", |
807 | xprt, -err); | |
e8353c76 | 808 | trace_rpc_socket_error(xprt, sk->sk_socket, err); |
2118071d TM |
809 | xprt_wake_pending_tasks(xprt, err); |
810 | out: | |
811 | read_unlock_bh(&sk->sk_callback_lock); | |
2a9e1cfa TM |
812 | } |
813 | ||
fe315e76 | 814 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 815 | { |
ee0ac0c2 CL |
816 | struct socket *sock = transport->sock; |
817 | struct sock *sk = transport->inet; | |
6cc7e908 | 818 | struct rpc_xprt *xprt = &transport->xprt; |
a246b010 | 819 | |
fe315e76 CL |
820 | if (sk == NULL) |
821 | return; | |
9903cd1c | 822 | |
264d1df3 JL |
823 | if (atomic_read(&transport->xprt.swapper)) |
824 | sk_clear_memalloc(sk); | |
825 | ||
09939204 TM |
826 | kernel_sock_shutdown(sock, SHUT_RDWR); |
827 | ||
edc1b01c | 828 | mutex_lock(&transport->recv_mutex); |
a246b010 | 829 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
830 | transport->inet = NULL; |
831 | transport->sock = NULL; | |
a246b010 | 832 | |
9903cd1c | 833 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
834 | |
835 | xs_restore_old_callbacks(transport, sk); | |
0c78789e | 836 | xprt_clear_connected(xprt); |
a246b010 | 837 | write_unlock_bh(&sk->sk_callback_lock); |
6cc7e908 | 838 | xs_sock_reset_connection_flags(xprt); |
edc1b01c | 839 | mutex_unlock(&transport->recv_mutex); |
a246b010 | 840 | |
6cc7e908 | 841 | trace_rpc_socket_close(xprt, sock); |
a246b010 | 842 | sock_release(sock); |
fe315e76 CL |
843 | } |
844 | ||
845 | /** | |
846 | * xs_close - close a socket | |
847 | * @xprt: transport | |
848 | * | |
849 | * This is used when all requests are complete; ie, no DRC state remains | |
850 | * on the server we want to save. | |
f75e6745 TM |
851 | * |
852 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
853 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
854 | */ |
855 | static void xs_close(struct rpc_xprt *xprt) | |
856 | { | |
857 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
858 | ||
859 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
860 | ||
861 | xs_reset_transport(transport); | |
61d0a8e6 | 862 | xprt->reestablish_timeout = 0; |
fe315e76 | 863 | |
62da3b24 | 864 | xprt_disconnect_done(xprt); |
a246b010 CL |
865 | } |
866 | ||
4a068258 CL |
867 | static void xs_inject_disconnect(struct rpc_xprt *xprt) |
868 | { | |
869 | dprintk("RPC: injecting transport disconnect on xprt=%p\n", | |
870 | xprt); | |
871 | xprt_disconnect_done(xprt); | |
872 | } | |
873 | ||
315f3812 KM |
874 | static void xs_xprt_free(struct rpc_xprt *xprt) |
875 | { | |
876 | xs_free_peer_addresses(xprt); | |
877 | xprt_free(xprt); | |
878 | } | |
879 | ||
9903cd1c CL |
880 | /** |
881 | * xs_destroy - prepare to shutdown a transport | |
882 | * @xprt: doomed transport | |
883 | * | |
884 | */ | |
885 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 886 | { |
03c78827 TM |
887 | struct sock_xprt *transport = container_of(xprt, |
888 | struct sock_xprt, xprt); | |
46121cf7 | 889 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 890 | |
03c78827 | 891 | cancel_delayed_work_sync(&transport->connect_worker); |
a1311d87 | 892 | xs_close(xprt); |
edc1b01c | 893 | cancel_work_sync(&transport->recv_worker); |
315f3812 | 894 | xs_xprt_free(xprt); |
a1311d87 | 895 | module_put(THIS_MODULE); |
a246b010 CL |
896 | } |
897 | ||
176e21ee CL |
898 | static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) |
899 | { | |
900 | struct xdr_skb_reader desc = { | |
901 | .skb = skb, | |
902 | .offset = sizeof(rpc_fraghdr), | |
903 | .count = skb->len - sizeof(rpc_fraghdr), | |
904 | }; | |
905 | ||
906 | if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) | |
907 | return -1; | |
908 | if (desc.count) | |
909 | return -1; | |
910 | return 0; | |
911 | } | |
912 | ||
913 | /** | |
a2648094 TM |
914 | * xs_local_data_read_skb |
915 | * @xprt: transport | |
916 | * @sk: socket | |
917 | * @skb: skbuff | |
176e21ee CL |
918 | * |
919 | * Currently this assumes we can read the whole reply in a single gulp. | |
920 | */ | |
a2648094 TM |
921 | static void xs_local_data_read_skb(struct rpc_xprt *xprt, |
922 | struct sock *sk, | |
923 | struct sk_buff *skb) | |
176e21ee CL |
924 | { |
925 | struct rpc_task *task; | |
176e21ee | 926 | struct rpc_rqst *rovr; |
a2648094 | 927 | int repsize, copied; |
176e21ee CL |
928 | u32 _xid; |
929 | __be32 *xp; | |
930 | ||
176e21ee CL |
931 | repsize = skb->len - sizeof(rpc_fraghdr); |
932 | if (repsize < 4) { | |
933 | dprintk("RPC: impossible RPC reply size %d\n", repsize); | |
a2648094 | 934 | return; |
176e21ee CL |
935 | } |
936 | ||
937 | /* Copy the XID from the skb... */ | |
938 | xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); | |
939 | if (xp == NULL) | |
a2648094 | 940 | return; |
176e21ee CL |
941 | |
942 | /* Look up and lock the request corresponding to the given XID */ | |
a2648094 | 943 | spin_lock_bh(&xprt->transport_lock); |
176e21ee CL |
944 | rovr = xprt_lookup_rqst(xprt, *xp); |
945 | if (!rovr) | |
946 | goto out_unlock; | |
947 | task = rovr->rq_task; | |
948 | ||
949 | copied = rovr->rq_private_buf.buflen; | |
950 | if (copied > repsize) | |
951 | copied = repsize; | |
952 | ||
953 | if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { | |
954 | dprintk("RPC: sk_buff copy failed\n"); | |
955 | goto out_unlock; | |
956 | } | |
957 | ||
958 | xprt_complete_rqst(task, copied); | |
959 | ||
960 | out_unlock: | |
a2648094 TM |
961 | spin_unlock_bh(&xprt->transport_lock); |
962 | } | |
963 | ||
964 | static void xs_local_data_receive(struct sock_xprt *transport) | |
965 | { | |
966 | struct sk_buff *skb; | |
967 | struct sock *sk; | |
968 | int err; | |
969 | ||
970 | mutex_lock(&transport->recv_mutex); | |
971 | sk = transport->inet; | |
972 | if (sk == NULL) | |
973 | goto out; | |
974 | for (;;) { | |
975 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
976 | if (skb == NULL) | |
977 | break; | |
978 | xs_local_data_read_skb(&transport->xprt, sk, skb); | |
979 | skb_free_datagram(sk, skb); | |
980 | } | |
981 | out: | |
982 | mutex_unlock(&transport->recv_mutex); | |
983 | } | |
984 | ||
985 | static void xs_local_data_receive_workfn(struct work_struct *work) | |
986 | { | |
987 | struct sock_xprt *transport = | |
988 | container_of(work, struct sock_xprt, recv_worker); | |
989 | xs_local_data_receive(transport); | |
176e21ee CL |
990 | } |
991 | ||
9903cd1c | 992 | /** |
f9b2ee71 TM |
993 | * xs_udp_data_read_skb - receive callback for UDP sockets |
994 | * @xprt: transport | |
995 | * @sk: socket | |
996 | * @skb: skbuff | |
9903cd1c | 997 | * |
a246b010 | 998 | */ |
f9b2ee71 TM |
999 | static void xs_udp_data_read_skb(struct rpc_xprt *xprt, |
1000 | struct sock *sk, | |
1001 | struct sk_buff *skb) | |
a246b010 | 1002 | { |
9903cd1c | 1003 | struct rpc_task *task; |
a246b010 | 1004 | struct rpc_rqst *rovr; |
f9b2ee71 | 1005 | int repsize, copied; |
d8ed029d AD |
1006 | u32 _xid; |
1007 | __be32 *xp; | |
a246b010 | 1008 | |
a246b010 CL |
1009 | repsize = skb->len - sizeof(struct udphdr); |
1010 | if (repsize < 4) { | |
46121cf7 | 1011 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
f9b2ee71 | 1012 | return; |
a246b010 CL |
1013 | } |
1014 | ||
1015 | /* Copy the XID from the skb... */ | |
1016 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
1017 | sizeof(_xid), &_xid); | |
1018 | if (xp == NULL) | |
f9b2ee71 | 1019 | return; |
a246b010 CL |
1020 | |
1021 | /* Look up and lock the request corresponding to the given XID */ | |
f9b2ee71 | 1022 | spin_lock_bh(&xprt->transport_lock); |
a246b010 CL |
1023 | rovr = xprt_lookup_rqst(xprt, *xp); |
1024 | if (!rovr) | |
1025 | goto out_unlock; | |
1026 | task = rovr->rq_task; | |
1027 | ||
a246b010 CL |
1028 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
1029 | copied = repsize; | |
1030 | ||
1031 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 HX |
1032 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
1033 | UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); | |
a246b010 | 1034 | goto out_unlock; |
1781f7f5 HX |
1035 | } |
1036 | ||
1037 | UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); | |
a246b010 | 1038 | |
6a24dfb6 | 1039 | xprt_adjust_cwnd(xprt, task, copied); |
1570c1e4 | 1040 | xprt_complete_rqst(task, copied); |
a246b010 CL |
1041 | |
1042 | out_unlock: | |
f9b2ee71 TM |
1043 | spin_unlock_bh(&xprt->transport_lock); |
1044 | } | |
1045 | ||
1046 | static void xs_udp_data_receive(struct sock_xprt *transport) | |
1047 | { | |
1048 | struct sk_buff *skb; | |
1049 | struct sock *sk; | |
1050 | int err; | |
1051 | ||
1052 | mutex_lock(&transport->recv_mutex); | |
1053 | sk = transport->inet; | |
1054 | if (sk == NULL) | |
1055 | goto out; | |
1056 | for (;;) { | |
1057 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
1058 | if (skb == NULL) | |
1059 | break; | |
1060 | xs_udp_data_read_skb(&transport->xprt, sk, skb); | |
1061 | skb_free_datagram(sk, skb); | |
1062 | } | |
1063 | out: | |
1064 | mutex_unlock(&transport->recv_mutex); | |
1065 | } | |
1066 | ||
1067 | static void xs_udp_data_receive_workfn(struct work_struct *work) | |
1068 | { | |
1069 | struct sock_xprt *transport = | |
1070 | container_of(work, struct sock_xprt, recv_worker); | |
1071 | xs_udp_data_receive(transport); | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * xs_data_ready - "data ready" callback for UDP sockets | |
1076 | * @sk: socket with data to read | |
1077 | * | |
1078 | */ | |
1079 | static void xs_data_ready(struct sock *sk) | |
1080 | { | |
1081 | struct rpc_xprt *xprt; | |
1082 | ||
1083 | read_lock_bh(&sk->sk_callback_lock); | |
1084 | dprintk("RPC: xs_data_ready...\n"); | |
1085 | xprt = xprt_from_sock(sk); | |
1086 | if (xprt != NULL) { | |
1087 | struct sock_xprt *transport = container_of(xprt, | |
1088 | struct sock_xprt, xprt); | |
1089 | queue_work(rpciod_workqueue, &transport->recv_worker); | |
1090 | } | |
f064af1e | 1091 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1092 | } |
1093 | ||
a519fc7a TM |
1094 | /* |
1095 | * Helper function to force a TCP close if the server is sending | |
1096 | * junk and/or it has put us in CLOSE_WAIT | |
1097 | */ | |
1098 | static void xs_tcp_force_close(struct rpc_xprt *xprt) | |
1099 | { | |
a519fc7a TM |
1100 | xprt_force_disconnect(xprt); |
1101 | } | |
1102 | ||
dd456471 | 1103 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 1104 | { |
51971139 | 1105 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
1106 | size_t len, used; |
1107 | char *p; | |
1108 | ||
51971139 CL |
1109 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
1110 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 1111 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1112 | transport->tcp_offset += used; |
a246b010 CL |
1113 | if (used != len) |
1114 | return; | |
808012fb | 1115 | |
51971139 CL |
1116 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
1117 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 1118 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 1119 | else |
e136d092 | 1120 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 1121 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 1122 | |
e136d092 | 1123 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 1124 | transport->tcp_offset = 0; |
808012fb | 1125 | |
a246b010 | 1126 | /* Sanity check of the record length */ |
18dca02a | 1127 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 1128 | dprintk("RPC: invalid TCP record fragment length\n"); |
a519fc7a | 1129 | xs_tcp_force_close(xprt); |
9903cd1c | 1130 | return; |
a246b010 | 1131 | } |
46121cf7 | 1132 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 1133 | transport->tcp_reclen); |
a246b010 CL |
1134 | } |
1135 | ||
51971139 | 1136 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 1137 | { |
51971139 | 1138 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 1139 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 1140 | transport->tcp_offset = 0; |
e136d092 CL |
1141 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
1142 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1143 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 1144 | transport->tcp_copied = 0; |
a246b010 CL |
1145 | } |
1146 | } | |
1147 | } | |
1148 | ||
dd456471 | 1149 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1150 | { |
1151 | size_t len, used; | |
1152 | char *p; | |
1153 | ||
51971139 | 1154 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 1155 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 1156 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 1157 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1158 | transport->tcp_offset += used; |
a246b010 CL |
1159 | if (used != len) |
1160 | return; | |
e136d092 | 1161 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 1162 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 1163 | transport->tcp_copied = 4; |
18dca02a RL |
1164 | dprintk("RPC: reading %s XID %08x\n", |
1165 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
1166 | : "request with", | |
51971139 CL |
1167 | ntohl(transport->tcp_xid)); |
1168 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
1169 | } |
1170 | ||
18dca02a RL |
1171 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1172 | struct xdr_skb_reader *desc) | |
a246b010 | 1173 | { |
18dca02a RL |
1174 | size_t len, used; |
1175 | u32 offset; | |
b76ce561 | 1176 | char *p; |
18dca02a RL |
1177 | |
1178 | /* | |
1179 | * We want transport->tcp_offset to be 8 at the end of this routine | |
1180 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
1181 | * When this function is called for the first time, | |
1182 | * transport->tcp_offset is 4 (after having already read the xid). | |
1183 | */ | |
1184 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
b76ce561 | 1185 | len = sizeof(transport->tcp_calldir) - offset; |
18dca02a | 1186 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
b76ce561 TM |
1187 | p = ((char *) &transport->tcp_calldir) + offset; |
1188 | used = xdr_skb_read_bits(desc, p, len); | |
18dca02a RL |
1189 | transport->tcp_offset += used; |
1190 | if (used != len) | |
1191 | return; | |
f4a2e418 | 1192 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
f4a2e418 RL |
1193 | /* |
1194 | * We don't yet have the XDR buffer, so we will write the calldir | |
1195 | * out after we get the buffer from the 'struct rpc_rqst' | |
1196 | */ | |
b76ce561 TM |
1197 | switch (ntohl(transport->tcp_calldir)) { |
1198 | case RPC_REPLY: | |
1199 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1200 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1201 | transport->tcp_flags |= TCP_RPC_REPLY; |
b76ce561 TM |
1202 | break; |
1203 | case RPC_CALL: | |
1204 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1205 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1206 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
b76ce561 TM |
1207 | break; |
1208 | default: | |
1209 | dprintk("RPC: invalid request message type\n"); | |
a519fc7a | 1210 | xs_tcp_force_close(&transport->xprt); |
b76ce561 | 1211 | } |
18dca02a RL |
1212 | xs_tcp_check_fraghdr(transport); |
1213 | } | |
1214 | ||
44b98efd RL |
1215 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1216 | struct xdr_skb_reader *desc, | |
1217 | struct rpc_rqst *req) | |
a246b010 | 1218 | { |
44b98efd RL |
1219 | struct sock_xprt *transport = |
1220 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1221 | struct xdr_buf *rcvbuf; |
1222 | size_t len; | |
1223 | ssize_t r; | |
1224 | ||
a246b010 | 1225 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1226 | |
1227 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1228 | /* | |
1229 | * Save the RPC direction in the XDR buffer | |
1230 | */ | |
f4a2e418 | 1231 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
b76ce561 TM |
1232 | &transport->tcp_calldir, |
1233 | sizeof(transport->tcp_calldir)); | |
1234 | transport->tcp_copied += sizeof(transport->tcp_calldir); | |
f4a2e418 | 1235 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
a246b010 CL |
1236 | } |
1237 | ||
a246b010 | 1238 | len = desc->count; |
51971139 | 1239 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1240 | struct xdr_skb_reader my_desc; |
a246b010 | 1241 | |
51971139 | 1242 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1243 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1244 | my_desc.count = len; | |
51971139 | 1245 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1246 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1247 | desc->count -= r; |
1248 | desc->offset += r; | |
1249 | } else | |
51971139 | 1250 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1251 | desc, xdr_skb_read_bits); |
a246b010 CL |
1252 | |
1253 | if (r > 0) { | |
51971139 CL |
1254 | transport->tcp_copied += r; |
1255 | transport->tcp_offset += r; | |
a246b010 CL |
1256 | } |
1257 | if (r != len) { | |
1258 | /* Error when copying to the receive buffer, | |
1259 | * usually because we weren't able to allocate | |
1260 | * additional buffer pages. All we can do now | |
e136d092 | 1261 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1262 | * will not receive any additional updates, |
1263 | * and time out. | |
1264 | * Any remaining data from this record will | |
1265 | * be discarded. | |
1266 | */ | |
e136d092 | 1267 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1268 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1269 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1270 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1271 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1272 | xprt, transport->tcp_copied, | |
1273 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1274 | return; |
a246b010 CL |
1275 | } |
1276 | ||
46121cf7 | 1277 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1278 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1279 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1280 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1281 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1282 | |
1283 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1284 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1285 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1286 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1287 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 | 1288 | } |
44b98efd RL |
1289 | } |
1290 | ||
1291 | /* | |
1292 | * Finds the request corresponding to the RPC xid and invokes the common | |
1293 | * tcp read code to read the data. | |
1294 | */ | |
1295 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1296 | struct xdr_skb_reader *desc) | |
1297 | { | |
1298 | struct sock_xprt *transport = | |
1299 | container_of(xprt, struct sock_xprt, xprt); | |
1300 | struct rpc_rqst *req; | |
1301 | ||
1302 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1303 | ||
1304 | /* Find and lock the request corresponding to this xid */ | |
edc1b01c | 1305 | spin_lock_bh(&xprt->transport_lock); |
44b98efd RL |
1306 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
1307 | if (!req) { | |
1308 | dprintk("RPC: XID %08x request not found!\n", | |
1309 | ntohl(transport->tcp_xid)); | |
edc1b01c | 1310 | spin_unlock_bh(&xprt->transport_lock); |
44b98efd RL |
1311 | return -1; |
1312 | } | |
1313 | ||
1314 | xs_tcp_read_common(xprt, desc, req); | |
1315 | ||
e136d092 | 1316 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1317 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1318 | |
edc1b01c | 1319 | spin_unlock_bh(&xprt->transport_lock); |
44b98efd RL |
1320 | return 0; |
1321 | } | |
1322 | ||
9e00abc3 | 1323 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
44b98efd RL |
1324 | /* |
1325 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1326 | * tcp read code to read the data. The result is placed in the callback | |
1327 | * queue. | |
1328 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1329 | * connection and return -1. | |
1330 | */ | |
2ea24497 | 1331 | static int xs_tcp_read_callback(struct rpc_xprt *xprt, |
44b98efd RL |
1332 | struct xdr_skb_reader *desc) |
1333 | { | |
1334 | struct sock_xprt *transport = | |
1335 | container_of(xprt, struct sock_xprt, xprt); | |
1336 | struct rpc_rqst *req; | |
1337 | ||
2ea24497 | 1338 | /* Look up and lock the request corresponding to the given XID */ |
edc1b01c | 1339 | spin_lock_bh(&xprt->transport_lock); |
2ea24497 | 1340 | req = xprt_lookup_bc_request(xprt, transport->tcp_xid); |
44b98efd | 1341 | if (req == NULL) { |
edc1b01c | 1342 | spin_unlock_bh(&xprt->transport_lock); |
44b98efd RL |
1343 | printk(KERN_WARNING "Callback slot table overflowed\n"); |
1344 | xprt_force_disconnect(xprt); | |
1345 | return -1; | |
1346 | } | |
1347 | ||
44b98efd RL |
1348 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); |
1349 | xs_tcp_read_common(xprt, desc, req); | |
1350 | ||
2ea24497 TM |
1351 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
1352 | xprt_complete_bc_request(req, transport->tcp_copied); | |
edc1b01c | 1353 | spin_unlock_bh(&xprt->transport_lock); |
44b98efd RL |
1354 | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1359 | struct xdr_skb_reader *desc) | |
1360 | { | |
1361 | struct sock_xprt *transport = | |
1362 | container_of(xprt, struct sock_xprt, xprt); | |
1363 | ||
1364 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1365 | xs_tcp_read_reply(xprt, desc) : | |
1366 | xs_tcp_read_callback(xprt, desc); | |
1367 | } | |
76566773 CL |
1368 | |
1369 | static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net) | |
1370 | { | |
1371 | int ret; | |
1372 | ||
1373 | ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0, | |
1374 | SVC_SOCK_ANONYMOUS); | |
1375 | if (ret < 0) | |
1376 | return ret; | |
1377 | return 0; | |
1378 | } | |
44b98efd RL |
1379 | #else |
1380 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1381 | struct xdr_skb_reader *desc) | |
1382 | { | |
1383 | return xs_tcp_read_reply(xprt, desc); | |
1384 | } | |
9e00abc3 | 1385 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
44b98efd RL |
1386 | |
1387 | /* | |
1388 | * Read data off the transport. This can be either an RPC_CALL or an | |
1389 | * RPC_REPLY. Relay the processing to helper functions. | |
1390 | */ | |
1391 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1392 | struct xdr_skb_reader *desc) | |
1393 | { | |
1394 | struct sock_xprt *transport = | |
1395 | container_of(xprt, struct sock_xprt, xprt); | |
1396 | ||
1397 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1398 | xs_tcp_check_fraghdr(transport); | |
1399 | else { | |
1400 | /* | |
1401 | * The transport_lock protects the request handling. | |
1402 | * There's no need to hold it to update the tcp_flags. | |
1403 | */ | |
1404 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1405 | } | |
a246b010 CL |
1406 | } |
1407 | ||
dd456471 | 1408 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1409 | { |
1410 | size_t len; | |
1411 | ||
51971139 | 1412 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1413 | if (len > desc->count) |
1414 | len = desc->count; | |
1415 | desc->count -= len; | |
1416 | desc->offset += len; | |
51971139 | 1417 | transport->tcp_offset += len; |
46121cf7 | 1418 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1419 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1420 | } |
1421 | ||
9903cd1c | 1422 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1423 | { |
1424 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1425 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1426 | struct xdr_skb_reader desc = { |
a246b010 CL |
1427 | .skb = skb, |
1428 | .offset = offset, | |
1429 | .count = len, | |
9903cd1c | 1430 | }; |
a246b010 | 1431 | |
46121cf7 | 1432 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 | 1433 | do { |
1a867a08 | 1434 | trace_xs_tcp_data_recv(transport); |
a246b010 CL |
1435 | /* Read in a new fragment marker if necessary */ |
1436 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1437 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1438 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1439 | continue; |
1440 | } | |
1441 | /* Read in the xid if necessary */ | |
e136d092 | 1442 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1443 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1444 | continue; |
1445 | } | |
18dca02a | 1446 | /* Read in the call/reply flag */ |
f4a2e418 | 1447 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1448 | xs_tcp_read_calldir(transport, &desc); |
1449 | continue; | |
1450 | } | |
a246b010 | 1451 | /* Read in the request data */ |
e136d092 | 1452 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1453 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1454 | continue; |
1455 | } | |
1456 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1457 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1458 | } while (desc.count); |
1a867a08 | 1459 | trace_xs_tcp_data_recv(transport); |
46121cf7 | 1460 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1461 | return len - desc.count; |
1462 | } | |
1463 | ||
66d7a56a TM |
1464 | static void xs_tcp_data_receive(struct sock_xprt *transport) |
1465 | { | |
1466 | struct rpc_xprt *xprt = &transport->xprt; | |
1467 | struct sock *sk; | |
1468 | read_descriptor_t rd_desc = { | |
1469 | .count = 2*1024*1024, | |
1470 | .arg.data = xprt, | |
1471 | }; | |
1472 | unsigned long total = 0; | |
1473 | int read = 0; | |
1474 | ||
edc1b01c | 1475 | mutex_lock(&transport->recv_mutex); |
66d7a56a | 1476 | sk = transport->inet; |
edc1b01c TM |
1477 | if (sk == NULL) |
1478 | goto out; | |
66d7a56a TM |
1479 | |
1480 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ | |
1481 | for (;;) { | |
edc1b01c | 1482 | lock_sock(sk); |
66d7a56a | 1483 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
edc1b01c | 1484 | release_sock(sk); |
66d7a56a TM |
1485 | if (read <= 0) |
1486 | break; | |
1487 | total += read; | |
1488 | rd_desc.count = 65536; | |
1489 | } | |
edc1b01c TM |
1490 | out: |
1491 | mutex_unlock(&transport->recv_mutex); | |
66d7a56a TM |
1492 | trace_xs_tcp_data_ready(xprt, read, total); |
1493 | } | |
1494 | ||
edc1b01c TM |
1495 | static void xs_tcp_data_receive_workfn(struct work_struct *work) |
1496 | { | |
1497 | struct sock_xprt *transport = | |
1498 | container_of(work, struct sock_xprt, recv_worker); | |
1499 | xs_tcp_data_receive(transport); | |
1500 | } | |
1501 | ||
9903cd1c CL |
1502 | /** |
1503 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1504 | * @sk: socket with data to read | |
9903cd1c CL |
1505 | * |
1506 | */ | |
676d2369 | 1507 | static void xs_tcp_data_ready(struct sock *sk) |
a246b010 | 1508 | { |
66d7a56a | 1509 | struct sock_xprt *transport; |
a246b010 | 1510 | struct rpc_xprt *xprt; |
a246b010 | 1511 | |
46121cf7 CL |
1512 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1513 | ||
f064af1e | 1514 | read_lock_bh(&sk->sk_callback_lock); |
66d7a56a | 1515 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1516 | goto out; |
66d7a56a TM |
1517 | transport = container_of(xprt, struct sock_xprt, xprt); |
1518 | ||
61d0a8e6 NB |
1519 | /* Any data means we had a useful conversation, so |
1520 | * the we don't need to delay the next reconnect | |
1521 | */ | |
1522 | if (xprt->reestablish_timeout) | |
1523 | xprt->reestablish_timeout = 0; | |
edc1b01c | 1524 | queue_work(rpciod_workqueue, &transport->recv_worker); |
61d0a8e6 | 1525 | |
a246b010 | 1526 | out: |
f064af1e | 1527 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1528 | } |
1529 | ||
9903cd1c CL |
1530 | /** |
1531 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1532 | * @sk: socket whose state has changed | |
1533 | * | |
1534 | */ | |
1535 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1536 | { |
9903cd1c | 1537 | struct rpc_xprt *xprt; |
0fdea1e8 | 1538 | struct sock_xprt *transport; |
a246b010 | 1539 | |
f064af1e | 1540 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1541 | if (!(xprt = xprt_from_sock(sk))) |
1542 | goto out; | |
46121cf7 | 1543 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
669502ff | 1544 | dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
46121cf7 CL |
1545 | sk->sk_state, xprt_connected(xprt), |
1546 | sock_flag(sk, SOCK_DEAD), | |
669502ff AC |
1547 | sock_flag(sk, SOCK_ZAPPED), |
1548 | sk->sk_shutdown); | |
a246b010 | 1549 | |
0fdea1e8 | 1550 | transport = container_of(xprt, struct sock_xprt, xprt); |
40b5ea0c | 1551 | trace_rpc_socket_state_change(xprt, sk->sk_socket); |
a246b010 CL |
1552 | switch (sk->sk_state) { |
1553 | case TCP_ESTABLISHED: | |
f064af1e | 1554 | spin_lock(&xprt->transport_lock); |
a246b010 | 1555 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 | 1556 | |
a246b010 | 1557 | /* Reset TCP record info */ |
51971139 CL |
1558 | transport->tcp_offset = 0; |
1559 | transport->tcp_reclen = 0; | |
1560 | transport->tcp_copied = 0; | |
e136d092 CL |
1561 | transport->tcp_flags = |
1562 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
8b71798c | 1563 | xprt->connect_cookie++; |
0fdea1e8 TM |
1564 | clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); |
1565 | xprt_clear_connecting(xprt); | |
51971139 | 1566 | |
2a491991 | 1567 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1568 | } |
f064af1e | 1569 | spin_unlock(&xprt->transport_lock); |
a246b010 | 1570 | break; |
3b948ae5 TM |
1571 | case TCP_FIN_WAIT1: |
1572 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1573 | xprt->connect_cookie++; |
663b8858 | 1574 | xprt->reestablish_timeout = 0; |
3b948ae5 | 1575 | set_bit(XPRT_CLOSING, &xprt->state); |
4e857c58 | 1576 | smp_mb__before_atomic(); |
3b948ae5 | 1577 | clear_bit(XPRT_CONNECTED, &xprt->state); |
ef803670 | 1578 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
4e857c58 | 1579 | smp_mb__after_atomic(); |
a246b010 | 1580 | break; |
632e3bdc | 1581 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1582 | /* The server initiated a shutdown of the socket */ |
7c1d71cf | 1583 | xprt->connect_cookie++; |
d0bea455 | 1584 | clear_bit(XPRT_CONNECTED, &xprt->state); |
a519fc7a | 1585 | xs_tcp_force_close(xprt); |
663b8858 TM |
1586 | case TCP_CLOSING: |
1587 | /* | |
1588 | * If the server closed down the connection, make sure that | |
1589 | * we back off before reconnecting | |
1590 | */ | |
1591 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1592 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1593 | break; |
1594 | case TCP_LAST_ACK: | |
670f9457 | 1595 | set_bit(XPRT_CLOSING, &xprt->state); |
4e857c58 | 1596 | smp_mb__before_atomic(); |
3b948ae5 | 1597 | clear_bit(XPRT_CONNECTED, &xprt->state); |
4e857c58 | 1598 | smp_mb__after_atomic(); |
3b948ae5 TM |
1599 | break; |
1600 | case TCP_CLOSE: | |
0fdea1e8 TM |
1601 | if (test_and_clear_bit(XPRT_SOCK_CONNECTING, |
1602 | &transport->sock_state)) | |
1603 | xprt_clear_connecting(xprt); | |
7d1e8255 | 1604 | xs_sock_mark_closed(xprt); |
a246b010 CL |
1605 | } |
1606 | out: | |
f064af1e | 1607 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1608 | } |
1609 | ||
1f0fa154 IJ |
1610 | static void xs_write_space(struct sock *sk) |
1611 | { | |
1612 | struct socket *sock; | |
1613 | struct rpc_xprt *xprt; | |
1614 | ||
1615 | if (unlikely(!(sock = sk->sk_socket))) | |
1616 | return; | |
1617 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
1618 | ||
1619 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1620 | return; | |
9cd3e072 | 1621 | if (test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sock->flags) == 0) |
1f0fa154 IJ |
1622 | return; |
1623 | ||
1624 | xprt_write_space(xprt); | |
1625 | } | |
1626 | ||
9903cd1c | 1627 | /** |
c7b2cae8 CL |
1628 | * xs_udp_write_space - callback invoked when socket buffer space |
1629 | * becomes available | |
9903cd1c CL |
1630 | * @sk: socket whose state has changed |
1631 | * | |
a246b010 CL |
1632 | * Called when more output buffer space is available for this socket. |
1633 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1634 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1635 | * with a bunch of small requests. |
1636 | */ | |
c7b2cae8 | 1637 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1638 | { |
f064af1e | 1639 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1640 | |
c7b2cae8 | 1641 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1642 | if (sock_writeable(sk)) |
1643 | xs_write_space(sk); | |
a246b010 | 1644 | |
f064af1e | 1645 | read_unlock_bh(&sk->sk_callback_lock); |
c7b2cae8 | 1646 | } |
a246b010 | 1647 | |
c7b2cae8 CL |
1648 | /** |
1649 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1650 | * becomes available | |
1651 | * @sk: socket whose state has changed | |
1652 | * | |
1653 | * Called when more output buffer space is available for this socket. | |
1654 | * We try not to wake our writers until they can make "significant" | |
1655 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1656 | * with a bunch of small requests. | |
1657 | */ | |
1658 | static void xs_tcp_write_space(struct sock *sk) | |
1659 | { | |
f064af1e | 1660 | read_lock_bh(&sk->sk_callback_lock); |
c7b2cae8 CL |
1661 | |
1662 | /* from net/core/stream.c:sk_stream_write_space */ | |
64dc6130 | 1663 | if (sk_stream_is_writeable(sk)) |
1f0fa154 | 1664 | xs_write_space(sk); |
b6ddf64f | 1665 | |
f064af1e | 1666 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1667 | } |
1668 | ||
470056c2 | 1669 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1670 | { |
ee0ac0c2 CL |
1671 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1672 | struct sock *sk = transport->inet; | |
a246b010 | 1673 | |
7c6e066e | 1674 | if (transport->rcvsize) { |
a246b010 | 1675 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1676 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1677 | } |
7c6e066e | 1678 | if (transport->sndsize) { |
a246b010 | 1679 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1680 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1681 | sk->sk_write_space(sk); |
1682 | } | |
1683 | } | |
1684 | ||
43118c29 | 1685 | /** |
470056c2 | 1686 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1687 | * @xprt: generic transport |
470056c2 CL |
1688 | * @sndsize: requested size of send buffer, in bytes |
1689 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1690 | * |
470056c2 | 1691 | * Set socket send and receive buffer size limits. |
43118c29 | 1692 | */ |
470056c2 | 1693 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1694 | { |
7c6e066e CL |
1695 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1696 | ||
1697 | transport->sndsize = 0; | |
470056c2 | 1698 | if (sndsize) |
7c6e066e CL |
1699 | transport->sndsize = sndsize + 1024; |
1700 | transport->rcvsize = 0; | |
470056c2 | 1701 | if (rcvsize) |
7c6e066e | 1702 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1703 | |
1704 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1705 | } |
1706 | ||
46c0ee8b CL |
1707 | /** |
1708 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1709 | * @task: task that timed out | |
1710 | * | |
1711 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1712 | */ | |
6a24dfb6 | 1713 | static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) |
46c0ee8b | 1714 | { |
6a24dfb6 | 1715 | xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); |
46c0ee8b CL |
1716 | } |
1717 | ||
b85d8806 CL |
1718 | static unsigned short xs_get_random_port(void) |
1719 | { | |
1720 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
63862b5b | 1721 | unsigned short rand = (unsigned short) prandom_u32() % range; |
b85d8806 CL |
1722 | return rand + xprt_min_resvport; |
1723 | } | |
1724 | ||
4dda9c8a TM |
1725 | /** |
1726 | * xs_set_reuseaddr_port - set the socket's port and address reuse options | |
1727 | * @sock: socket | |
1728 | * | |
1729 | * Note that this function has to be called on all sockets that share the | |
1730 | * same port, and it must be called before binding. | |
1731 | */ | |
1732 | static void xs_sock_set_reuseport(struct socket *sock) | |
1733 | { | |
402e23b4 | 1734 | int opt = 1; |
4dda9c8a | 1735 | |
402e23b4 TM |
1736 | kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, |
1737 | (char *)&opt, sizeof(opt)); | |
4dda9c8a TM |
1738 | } |
1739 | ||
1740 | static unsigned short xs_sock_getport(struct socket *sock) | |
1741 | { | |
1742 | struct sockaddr_storage buf; | |
1743 | int buflen; | |
1744 | unsigned short port = 0; | |
1745 | ||
1746 | if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0) | |
1747 | goto out; | |
1748 | switch (buf.ss_family) { | |
1749 | case AF_INET6: | |
1750 | port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); | |
1751 | break; | |
1752 | case AF_INET: | |
1753 | port = ntohs(((struct sockaddr_in *)&buf)->sin_port); | |
1754 | } | |
1755 | out: | |
1756 | return port; | |
1757 | } | |
1758 | ||
92200412 CL |
1759 | /** |
1760 | * xs_set_port - reset the port number in the remote endpoint address | |
1761 | * @xprt: generic transport | |
1762 | * @port: new port number | |
1763 | * | |
1764 | */ | |
1765 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1766 | { | |
46121cf7 | 1767 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1768 | |
9dc3b095 CL |
1769 | rpc_set_port(xs_addr(xprt), port); |
1770 | xs_update_peer_port(xprt); | |
92200412 CL |
1771 | } |
1772 | ||
4dda9c8a TM |
1773 | static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) |
1774 | { | |
1775 | if (transport->srcport == 0) | |
1776 | transport->srcport = xs_sock_getport(sock); | |
1777 | } | |
1778 | ||
5d4ec932 | 1779 | static unsigned short xs_get_srcport(struct sock_xprt *transport) |
67a391d7 | 1780 | { |
fbfffbd5 | 1781 | unsigned short port = transport->srcport; |
67a391d7 TM |
1782 | |
1783 | if (port == 0 && transport->xprt.resvport) | |
1784 | port = xs_get_random_port(); | |
1785 | return port; | |
1786 | } | |
1787 | ||
baaf4e48 | 1788 | static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
67a391d7 | 1789 | { |
fbfffbd5 CL |
1790 | if (transport->srcport != 0) |
1791 | transport->srcport = 0; | |
67a391d7 TM |
1792 | if (!transport->xprt.resvport) |
1793 | return 0; | |
1794 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1795 | return xprt_max_resvport; | |
1796 | return --port; | |
1797 | } | |
beb59b68 | 1798 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
a246b010 | 1799 | { |
beb59b68 | 1800 | struct sockaddr_storage myaddr; |
67a391d7 | 1801 | int err, nloop = 0; |
5d4ec932 | 1802 | unsigned short port = xs_get_srcport(transport); |
67a391d7 | 1803 | unsigned short last; |
a246b010 | 1804 | |
0f7a622c CP |
1805 | /* |
1806 | * If we are asking for any ephemeral port (i.e. port == 0 && | |
1807 | * transport->xprt.resvport == 0), don't bind. Let the local | |
1808 | * port selection happen implicitly when the socket is used | |
1809 | * (for example at connect time). | |
1810 | * | |
1811 | * This ensures that we can continue to establish TCP | |
1812 | * connections even when all local ephemeral ports are already | |
1813 | * a part of some TCP connection. This makes no difference | |
1814 | * for UDP sockets, but also doens't harm them. | |
1815 | * | |
1816 | * If we're asking for any reserved port (i.e. port == 0 && | |
1817 | * transport->xprt.resvport == 1) xs_get_srcport above will | |
1818 | * ensure that port is non-zero and we will bind as needed. | |
1819 | */ | |
1820 | if (port == 0) | |
1821 | return 0; | |
1822 | ||
beb59b68 | 1823 | memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
a246b010 | 1824 | do { |
beb59b68 PE |
1825 | rpc_set_port((struct sockaddr *)&myaddr, port); |
1826 | err = kernel_bind(sock, (struct sockaddr *)&myaddr, | |
1827 | transport->xprt.addrlen); | |
a246b010 | 1828 | if (err == 0) { |
fbfffbd5 | 1829 | transport->srcport = port; |
d3bc9a1d | 1830 | break; |
a246b010 | 1831 | } |
67a391d7 | 1832 | last = port; |
baaf4e48 | 1833 | port = xs_next_srcport(transport, port); |
67a391d7 TM |
1834 | if (port > last) |
1835 | nloop++; | |
1836 | } while (err == -EADDRINUSE && nloop != 2); | |
90058d37 | 1837 | |
4232e863 | 1838 | if (myaddr.ss_family == AF_INET) |
beb59b68 PE |
1839 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
1840 | &((struct sockaddr_in *)&myaddr)->sin_addr, | |
1841 | port, err ? "failed" : "ok", err); | |
1842 | else | |
1843 | dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, | |
1844 | &((struct sockaddr_in6 *)&myaddr)->sin6_addr, | |
1845 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1846 | return err; |
1847 | } | |
1848 | ||
176e21ee CL |
1849 | /* |
1850 | * We don't support autobind on AF_LOCAL sockets | |
1851 | */ | |
1852 | static void xs_local_rpcbind(struct rpc_task *task) | |
1853 | { | |
3dc0da27 TM |
1854 | rcu_read_lock(); |
1855 | xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); | |
1856 | rcu_read_unlock(); | |
176e21ee CL |
1857 | } |
1858 | ||
1859 | static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1860 | { | |
1861 | } | |
beb59b68 | 1862 | |
ed07536e PZ |
1863 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1864 | static struct lock_class_key xs_key[2]; | |
1865 | static struct lock_class_key xs_slock_key[2]; | |
1866 | ||
176e21ee CL |
1867 | static inline void xs_reclassify_socketu(struct socket *sock) |
1868 | { | |
1869 | struct sock *sk = sock->sk; | |
1870 | ||
176e21ee CL |
1871 | sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", |
1872 | &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); | |
1873 | } | |
1874 | ||
8945ee5e | 1875 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1876 | { |
1877 | struct sock *sk = sock->sk; | |
8945ee5e | 1878 | |
8945ee5e CL |
1879 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1880 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1881 | } | |
ed07536e | 1882 | |
8945ee5e CL |
1883 | static inline void xs_reclassify_socket6(struct socket *sock) |
1884 | { | |
1885 | struct sock *sk = sock->sk; | |
ed07536e | 1886 | |
8945ee5e CL |
1887 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1888 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e | 1889 | } |
6bc9638a PE |
1890 | |
1891 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1892 | { | |
1b7a1819 WAA |
1893 | WARN_ON_ONCE(sock_owned_by_user(sock->sk)); |
1894 | if (sock_owned_by_user(sock->sk)) | |
1895 | return; | |
1896 | ||
4232e863 | 1897 | switch (family) { |
176e21ee CL |
1898 | case AF_LOCAL: |
1899 | xs_reclassify_socketu(sock); | |
1900 | break; | |
4232e863 | 1901 | case AF_INET: |
6bc9638a | 1902 | xs_reclassify_socket4(sock); |
4232e863 CL |
1903 | break; |
1904 | case AF_INET6: | |
6bc9638a | 1905 | xs_reclassify_socket6(sock); |
4232e863 CL |
1906 | break; |
1907 | } | |
6bc9638a | 1908 | } |
ed07536e | 1909 | #else |
176e21ee CL |
1910 | static inline void xs_reclassify_socketu(struct socket *sock) |
1911 | { | |
1912 | } | |
1913 | ||
8945ee5e CL |
1914 | static inline void xs_reclassify_socket4(struct socket *sock) |
1915 | { | |
1916 | } | |
1917 | ||
1918 | static inline void xs_reclassify_socket6(struct socket *sock) | |
ed07536e PZ |
1919 | { |
1920 | } | |
6bc9638a PE |
1921 | |
1922 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1923 | { | |
1924 | } | |
ed07536e PZ |
1925 | #endif |
1926 | ||
93dc41bd N |
1927 | static void xs_dummy_setup_socket(struct work_struct *work) |
1928 | { | |
1929 | } | |
1930 | ||
6bc9638a | 1931 | static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
4dda9c8a TM |
1932 | struct sock_xprt *transport, int family, int type, |
1933 | int protocol, bool reuseport) | |
22f79326 PE |
1934 | { |
1935 | struct socket *sock; | |
1936 | int err; | |
1937 | ||
6bc9638a | 1938 | err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
22f79326 PE |
1939 | if (err < 0) { |
1940 | dprintk("RPC: can't create %d transport socket (%d).\n", | |
1941 | protocol, -err); | |
1942 | goto out; | |
1943 | } | |
6bc9638a | 1944 | xs_reclassify_socket(family, sock); |
22f79326 | 1945 | |
4dda9c8a TM |
1946 | if (reuseport) |
1947 | xs_sock_set_reuseport(sock); | |
1948 | ||
4cea288a BH |
1949 | err = xs_bind(transport, sock); |
1950 | if (err) { | |
22f79326 PE |
1951 | sock_release(sock); |
1952 | goto out; | |
1953 | } | |
1954 | ||
1955 | return sock; | |
1956 | out: | |
1957 | return ERR_PTR(err); | |
1958 | } | |
1959 | ||
176e21ee CL |
1960 | static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
1961 | struct socket *sock) | |
1962 | { | |
1963 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1964 | xprt); | |
1965 | ||
1966 | if (!transport->inet) { | |
1967 | struct sock *sk = sock->sk; | |
1968 | ||
1969 | write_lock_bh(&sk->sk_callback_lock); | |
1970 | ||
1971 | xs_save_old_callbacks(transport, sk); | |
1972 | ||
1973 | sk->sk_user_data = xprt; | |
a2648094 | 1974 | sk->sk_data_ready = xs_data_ready; |
176e21ee | 1975 | sk->sk_write_space = xs_udp_write_space; |
2118071d | 1976 | sk->sk_error_report = xs_error_report; |
c2126157 | 1977 | sk->sk_allocation = GFP_NOIO; |
176e21ee CL |
1978 | |
1979 | xprt_clear_connected(xprt); | |
1980 | ||
1981 | /* Reset to new socket */ | |
1982 | transport->sock = sock; | |
1983 | transport->inet = sk; | |
1984 | ||
1985 | write_unlock_bh(&sk->sk_callback_lock); | |
1986 | } | |
1987 | ||
1988 | /* Tell the socket layer to start connecting... */ | |
1989 | xprt->stat.connect_count++; | |
1990 | xprt->stat.connect_start = jiffies; | |
1991 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); | |
1992 | } | |
1993 | ||
1994 | /** | |
1995 | * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint | |
176e21ee | 1996 | * @transport: socket transport to connect |
176e21ee | 1997 | */ |
dc107402 | 1998 | static int xs_local_setup_socket(struct sock_xprt *transport) |
176e21ee | 1999 | { |
176e21ee CL |
2000 | struct rpc_xprt *xprt = &transport->xprt; |
2001 | struct socket *sock; | |
2002 | int status = -EIO; | |
2003 | ||
176e21ee CL |
2004 | status = __sock_create(xprt->xprt_net, AF_LOCAL, |
2005 | SOCK_STREAM, 0, &sock, 1); | |
2006 | if (status < 0) { | |
2007 | dprintk("RPC: can't create AF_LOCAL " | |
2008 | "transport socket (%d).\n", -status); | |
2009 | goto out; | |
2010 | } | |
2011 | xs_reclassify_socketu(sock); | |
2012 | ||
2013 | dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", | |
2014 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2015 | ||
2016 | status = xs_local_finish_connecting(xprt, sock); | |
40b5ea0c | 2017 | trace_rpc_socket_connect(xprt, sock, status); |
176e21ee CL |
2018 | switch (status) { |
2019 | case 0: | |
2020 | dprintk("RPC: xprt %p connected to %s\n", | |
2021 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2022 | xprt_set_connected(xprt); | |
3601c4a9 | 2023 | case -ENOBUFS: |
176e21ee CL |
2024 | break; |
2025 | case -ENOENT: | |
2026 | dprintk("RPC: xprt %p: socket %s does not exist\n", | |
2027 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2028 | break; | |
4a20a988 TM |
2029 | case -ECONNREFUSED: |
2030 | dprintk("RPC: xprt %p: connection refused for %s\n", | |
2031 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2032 | break; | |
176e21ee CL |
2033 | default: |
2034 | printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", | |
2035 | __func__, -status, | |
2036 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2037 | } | |
2038 | ||
2039 | out: | |
2040 | xprt_clear_connecting(xprt); | |
2041 | xprt_wake_pending_tasks(xprt, status); | |
dc107402 BF |
2042 | return status; |
2043 | } | |
2044 | ||
b6669737 | 2045 | static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
dc107402 | 2046 | { |
dc107402 BF |
2047 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2048 | int ret; | |
2049 | ||
2050 | if (RPC_IS_ASYNC(task)) { | |
2051 | /* | |
2052 | * We want the AF_LOCAL connect to be resolved in the | |
2053 | * filesystem namespace of the process making the rpc | |
2054 | * call. Thus we connect synchronously. | |
2055 | * | |
2056 | * If we want to support asynchronous AF_LOCAL calls, | |
2057 | * we'll need to figure out how to pass a namespace to | |
2058 | * connect. | |
2059 | */ | |
2060 | rpc_exit(task, -ENOTCONN); | |
2061 | return; | |
2062 | } | |
2063 | ret = xs_local_setup_socket(transport); | |
2064 | if (ret && !RPC_IS_SOFTCONN(task)) | |
2065 | msleep_interruptible(15000); | |
176e21ee CL |
2066 | } |
2067 | ||
3c87ef6e | 2068 | #if IS_ENABLED(CONFIG_SUNRPC_SWAP) |
d6e971d8 JL |
2069 | /* |
2070 | * Note that this should be called with XPRT_LOCKED held (or when we otherwise | |
2071 | * know that we have exclusive access to the socket), to guard against | |
2072 | * races with xs_reset_transport. | |
2073 | */ | |
a564b8f0 MG |
2074 | static void xs_set_memalloc(struct rpc_xprt *xprt) |
2075 | { | |
2076 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
2077 | xprt); | |
2078 | ||
d6e971d8 JL |
2079 | /* |
2080 | * If there's no sock, then we have nothing to set. The | |
2081 | * reconnecting process will get it for us. | |
2082 | */ | |
2083 | if (!transport->inet) | |
2084 | return; | |
8e228133 | 2085 | if (atomic_read(&xprt->swapper)) |
a564b8f0 MG |
2086 | sk_set_memalloc(transport->inet); |
2087 | } | |
2088 | ||
2089 | /** | |
d67fa4d8 | 2090 | * xs_enable_swap - Tag this transport as being used for swap. |
a564b8f0 | 2091 | * @xprt: transport to tag |
a564b8f0 | 2092 | * |
8e228133 JL |
2093 | * Take a reference to this transport on behalf of the rpc_clnt, and |
2094 | * optionally mark it for swapping if it wasn't already. | |
a564b8f0 | 2095 | */ |
d67fa4d8 JL |
2096 | static int |
2097 | xs_enable_swap(struct rpc_xprt *xprt) | |
a564b8f0 | 2098 | { |
d6e971d8 | 2099 | struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); |
a564b8f0 | 2100 | |
d6e971d8 JL |
2101 | if (atomic_inc_return(&xprt->swapper) != 1) |
2102 | return 0; | |
2103 | if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) | |
2104 | return -ERESTARTSYS; | |
2105 | if (xs->inet) | |
2106 | sk_set_memalloc(xs->inet); | |
2107 | xprt_release_xprt(xprt, NULL); | |
8e228133 JL |
2108 | return 0; |
2109 | } | |
a564b8f0 | 2110 | |
8e228133 | 2111 | /** |
d67fa4d8 | 2112 | * xs_disable_swap - Untag this transport as being used for swap. |
8e228133 JL |
2113 | * @xprt: transport to tag |
2114 | * | |
2115 | * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the | |
2116 | * swapper refcount goes to 0, untag the socket as a memalloc socket. | |
2117 | */ | |
d67fa4d8 JL |
2118 | static void |
2119 | xs_disable_swap(struct rpc_xprt *xprt) | |
8e228133 | 2120 | { |
d6e971d8 | 2121 | struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); |
8e228133 | 2122 | |
d6e971d8 JL |
2123 | if (!atomic_dec_and_test(&xprt->swapper)) |
2124 | return; | |
2125 | if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) | |
2126 | return; | |
2127 | if (xs->inet) | |
2128 | sk_clear_memalloc(xs->inet); | |
2129 | xprt_release_xprt(xprt, NULL); | |
a564b8f0 | 2130 | } |
a564b8f0 MG |
2131 | #else |
2132 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
2133 | { | |
2134 | } | |
d67fa4d8 JL |
2135 | |
2136 | static int | |
2137 | xs_enable_swap(struct rpc_xprt *xprt) | |
2138 | { | |
2139 | return -EINVAL; | |
2140 | } | |
2141 | ||
2142 | static void | |
2143 | xs_disable_swap(struct rpc_xprt *xprt) | |
2144 | { | |
2145 | } | |
a564b8f0 MG |
2146 | #endif |
2147 | ||
16be2d20 CL |
2148 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
2149 | { | |
2150 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
2151 | ||
2152 | if (!transport->inet) { | |
2153 | struct sock *sk = sock->sk; | |
2154 | ||
2155 | write_lock_bh(&sk->sk_callback_lock); | |
2156 | ||
2a9e1cfa TM |
2157 | xs_save_old_callbacks(transport, sk); |
2158 | ||
16be2d20 | 2159 | sk->sk_user_data = xprt; |
f9b2ee71 | 2160 | sk->sk_data_ready = xs_data_ready; |
16be2d20 | 2161 | sk->sk_write_space = xs_udp_write_space; |
c2126157 | 2162 | sk->sk_allocation = GFP_NOIO; |
16be2d20 CL |
2163 | |
2164 | xprt_set_connected(xprt); | |
2165 | ||
2166 | /* Reset to new socket */ | |
2167 | transport->sock = sock; | |
2168 | transport->inet = sk; | |
2169 | ||
a564b8f0 MG |
2170 | xs_set_memalloc(xprt); |
2171 | ||
16be2d20 CL |
2172 | write_unlock_bh(&sk->sk_callback_lock); |
2173 | } | |
2174 | xs_udp_do_set_buffer_size(xprt); | |
2175 | } | |
2176 | ||
8c14ff2a | 2177 | static void xs_udp_setup_socket(struct work_struct *work) |
a246b010 | 2178 | { |
34161db6 TM |
2179 | struct sock_xprt *transport = |
2180 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 2181 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 2182 | struct socket *sock = transport->sock; |
b65c0310 | 2183 | int status = -EIO; |
9903cd1c | 2184 | |
8c14ff2a | 2185 | sock = xs_create_sock(xprt, transport, |
4dda9c8a TM |
2186 | xs_addr(xprt)->sa_family, SOCK_DGRAM, |
2187 | IPPROTO_UDP, false); | |
b65c0310 | 2188 | if (IS_ERR(sock)) |
b0d93ad5 | 2189 | goto out; |
68e220bd | 2190 | |
c740eff8 CL |
2191 | dprintk("RPC: worker connecting xprt %p via %s to " |
2192 | "%s (port %s)\n", xprt, | |
2193 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2194 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2195 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
2196 | |
2197 | xs_udp_finish_connecting(xprt, sock); | |
40b5ea0c | 2198 | trace_rpc_socket_connect(xprt, sock, 0); |
b0d93ad5 CL |
2199 | status = 0; |
2200 | out: | |
718ba5b8 | 2201 | xprt_unlock_connect(xprt, transport); |
b0d93ad5 | 2202 | xprt_clear_connecting(xprt); |
7d1e8255 | 2203 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
2204 | } |
2205 | ||
4876cc77 TM |
2206 | /** |
2207 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
2208 | * @xprt: transport | |
2209 | * | |
2210 | * Initiates a graceful shutdown of the TCP socket by calling the | |
2211 | * equivalent of shutdown(SHUT_RDWR); | |
2212 | */ | |
2213 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
2214 | { | |
2215 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
2216 | struct socket *sock = transport->sock; | |
2217 | ||
2218 | if (sock == NULL) | |
2219 | return; | |
2220 | if (xprt_connected(xprt)) { | |
2221 | kernel_sock_shutdown(sock, SHUT_RDWR); | |
2222 | trace_rpc_socket_shutdown(xprt, sock); | |
2223 | } else | |
2224 | xs_reset_transport(transport); | |
2225 | } | |
2226 | ||
16be2d20 | 2227 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 2228 | { |
16be2d20 | 2229 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
fe19a96b | 2230 | int ret = -ENOTCONN; |
edb267a6 | 2231 | |
ee0ac0c2 | 2232 | if (!transport->inet) { |
b0d93ad5 | 2233 | struct sock *sk = sock->sk; |
7f260e85 TM |
2234 | unsigned int keepidle = xprt->timeout->to_initval / HZ; |
2235 | unsigned int keepcnt = xprt->timeout->to_retries + 1; | |
2236 | unsigned int opt_on = 1; | |
775f06ab | 2237 | unsigned int timeo; |
7f260e85 TM |
2238 | |
2239 | /* TCP Keepalive options */ | |
2240 | kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, | |
2241 | (char *)&opt_on, sizeof(opt_on)); | |
2242 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, | |
2243 | (char *)&keepidle, sizeof(keepidle)); | |
2244 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, | |
2245 | (char *)&keepidle, sizeof(keepidle)); | |
2246 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, | |
2247 | (char *)&keepcnt, sizeof(keepcnt)); | |
b0d93ad5 | 2248 | |
775f06ab TM |
2249 | /* TCP user timeout (see RFC5482) */ |
2250 | timeo = jiffies_to_msecs(xprt->timeout->to_initval) * | |
2251 | (xprt->timeout->to_retries + 1); | |
2252 | kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, | |
2253 | (char *)&timeo, sizeof(timeo)); | |
2254 | ||
b0d93ad5 CL |
2255 | write_lock_bh(&sk->sk_callback_lock); |
2256 | ||
2a9e1cfa TM |
2257 | xs_save_old_callbacks(transport, sk); |
2258 | ||
b0d93ad5 | 2259 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
2260 | sk->sk_data_ready = xs_tcp_data_ready; |
2261 | sk->sk_state_change = xs_tcp_state_change; | |
2262 | sk->sk_write_space = xs_tcp_write_space; | |
2118071d | 2263 | sk->sk_error_report = xs_error_report; |
c2126157 | 2264 | sk->sk_allocation = GFP_NOIO; |
3167e12c CL |
2265 | |
2266 | /* socket options */ | |
3167e12c | 2267 | sock_reset_flag(sk, SOCK_LINGER); |
3167e12c | 2268 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
b0d93ad5 CL |
2269 | |
2270 | xprt_clear_connected(xprt); | |
2271 | ||
2272 | /* Reset to new socket */ | |
ee0ac0c2 CL |
2273 | transport->sock = sock; |
2274 | transport->inet = sk; | |
b0d93ad5 CL |
2275 | |
2276 | write_unlock_bh(&sk->sk_callback_lock); | |
2277 | } | |
2278 | ||
01d37c42 | 2279 | if (!xprt_bound(xprt)) |
fe19a96b | 2280 | goto out; |
01d37c42 | 2281 | |
a564b8f0 MG |
2282 | xs_set_memalloc(xprt); |
2283 | ||
b0d93ad5 | 2284 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
2285 | xprt->stat.connect_count++; |
2286 | xprt->stat.connect_start = jiffies; | |
0fdea1e8 | 2287 | set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); |
fe19a96b TM |
2288 | ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
2289 | switch (ret) { | |
2290 | case 0: | |
4dda9c8a | 2291 | xs_set_srcport(transport, sock); |
fe19a96b TM |
2292 | case -EINPROGRESS: |
2293 | /* SYN_SENT! */ | |
fe19a96b TM |
2294 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2295 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2296 | } | |
2297 | out: | |
2298 | return ret; | |
16be2d20 CL |
2299 | } |
2300 | ||
9903cd1c | 2301 | /** |
b61d59ff | 2302 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
9903cd1c CL |
2303 | * |
2304 | * Invoked by a work queue tasklet. | |
a246b010 | 2305 | */ |
cdd518d5 | 2306 | static void xs_tcp_setup_socket(struct work_struct *work) |
a246b010 | 2307 | { |
cdd518d5 PE |
2308 | struct sock_xprt *transport = |
2309 | container_of(work, struct sock_xprt, connect_worker.work); | |
ee0ac0c2 | 2310 | struct socket *sock = transport->sock; |
a9f5f0f7 | 2311 | struct rpc_xprt *xprt = &transport->xprt; |
b61d59ff | 2312 | int status = -EIO; |
a246b010 | 2313 | |
ee0ac0c2 | 2314 | if (!sock) { |
cdd518d5 | 2315 | sock = xs_create_sock(xprt, transport, |
4dda9c8a TM |
2316 | xs_addr(xprt)->sa_family, SOCK_STREAM, |
2317 | IPPROTO_TCP, true); | |
b61d59ff TM |
2318 | if (IS_ERR(sock)) { |
2319 | status = PTR_ERR(sock); | |
3167e12c CL |
2320 | goto out; |
2321 | } | |
7d1e8255 | 2322 | } |
a246b010 | 2323 | |
c740eff8 CL |
2324 | dprintk("RPC: worker connecting xprt %p via %s to " |
2325 | "%s (port %s)\n", xprt, | |
2326 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2327 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2328 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 2329 | |
16be2d20 | 2330 | status = xs_tcp_finish_connecting(xprt, sock); |
40b5ea0c | 2331 | trace_rpc_socket_connect(xprt, sock, status); |
46121cf7 CL |
2332 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
2333 | xprt, -status, xprt_connected(xprt), | |
2334 | sock->sk->sk_state); | |
2a491991 | 2335 | switch (status) { |
f75e6745 TM |
2336 | default: |
2337 | printk("%s: connect returned unhandled error %d\n", | |
2338 | __func__, status); | |
2339 | case -EADDRNOTAVAIL: | |
2340 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
2341 | * and retry | |
2342 | */ | |
a519fc7a | 2343 | xs_tcp_force_close(xprt); |
88b5ed73 | 2344 | break; |
2a491991 TM |
2345 | case 0: |
2346 | case -EINPROGRESS: | |
2347 | case -EALREADY: | |
718ba5b8 | 2348 | xprt_unlock_connect(xprt, transport); |
7d1e8255 | 2349 | return; |
9fcfe0c8 TM |
2350 | case -EINVAL: |
2351 | /* Happens, for instance, if the user specified a link | |
2352 | * local IPv6 address without a scope-id. | |
2353 | */ | |
3ed5e2a2 TM |
2354 | case -ECONNREFUSED: |
2355 | case -ECONNRESET: | |
2356 | case -ENETUNREACH: | |
3913c78c | 2357 | case -EADDRINUSE: |
3601c4a9 | 2358 | case -ENOBUFS: |
3ed5e2a2 | 2359 | /* retry with existing socket, after a delay */ |
4efdd92c | 2360 | xs_tcp_force_close(xprt); |
9fcfe0c8 | 2361 | goto out; |
a246b010 | 2362 | } |
2a491991 | 2363 | status = -EAGAIN; |
a246b010 | 2364 | out: |
718ba5b8 | 2365 | xprt_unlock_connect(xprt, transport); |
68e220bd | 2366 | xprt_clear_connecting(xprt); |
7d1e8255 | 2367 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 2368 | } |
b0d93ad5 | 2369 | |
9903cd1c CL |
2370 | /** |
2371 | * xs_connect - connect a socket to a remote endpoint | |
1b092092 | 2372 | * @xprt: pointer to transport structure |
9903cd1c CL |
2373 | * @task: address of RPC task that manages state of connect request |
2374 | * | |
2375 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2376 | * |
2377 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2378 | * to guarantee that even unprivileged user processes can set up a | |
2379 | * socket on a privileged port. | |
2380 | * | |
2381 | * If a UDP socket connect fails, the delay behavior here prevents | |
2382 | * retry floods (hard mounts). | |
9903cd1c | 2383 | */ |
1b092092 | 2384 | static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
a246b010 | 2385 | { |
ee0ac0c2 | 2386 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2387 | |
718ba5b8 TM |
2388 | WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); |
2389 | ||
99b1a4c3 | 2390 | if (transport->sock != NULL) { |
46121cf7 CL |
2391 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2392 | "seconds\n", | |
03bf4b70 | 2393 | xprt, xprt->reestablish_timeout / HZ); |
99b1a4c3 TM |
2394 | |
2395 | /* Start by resetting any existing state */ | |
2396 | xs_reset_transport(transport); | |
2397 | ||
c1384c9c TM |
2398 | queue_delayed_work(rpciod_workqueue, |
2399 | &transport->connect_worker, | |
2400 | xprt->reestablish_timeout); | |
03bf4b70 | 2401 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2402 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2403 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2404 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2405 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2406 | } else { |
46121cf7 | 2407 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2408 | queue_delayed_work(rpciod_workqueue, |
2409 | &transport->connect_worker, 0); | |
a246b010 CL |
2410 | } |
2411 | } | |
2412 | ||
176e21ee CL |
2413 | /** |
2414 | * xs_local_print_stats - display AF_LOCAL socket-specifc stats | |
2415 | * @xprt: rpc_xprt struct containing statistics | |
2416 | * @seq: output file | |
2417 | * | |
2418 | */ | |
2419 | static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2420 | { | |
2421 | long idle_time = 0; | |
2422 | ||
2423 | if (xprt_connected(xprt)) | |
2424 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2425 | ||
2426 | seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " | |
15a45206 | 2427 | "%llu %llu %lu %llu %llu\n", |
176e21ee CL |
2428 | xprt->stat.bind_count, |
2429 | xprt->stat.connect_count, | |
2430 | xprt->stat.connect_time, | |
2431 | idle_time, | |
2432 | xprt->stat.sends, | |
2433 | xprt->stat.recvs, | |
2434 | xprt->stat.bad_xids, | |
2435 | xprt->stat.req_u, | |
15a45206 AA |
2436 | xprt->stat.bklog_u, |
2437 | xprt->stat.max_slots, | |
2438 | xprt->stat.sending_u, | |
2439 | xprt->stat.pending_u); | |
176e21ee CL |
2440 | } |
2441 | ||
262ca07d CL |
2442 | /** |
2443 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2444 | * @xprt: rpc_xprt struct containing statistics | |
2445 | * @seq: output file | |
2446 | * | |
2447 | */ | |
2448 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2449 | { | |
c8475461 CL |
2450 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2451 | ||
15a45206 AA |
2452 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " |
2453 | "%lu %llu %llu\n", | |
fbfffbd5 | 2454 | transport->srcport, |
262ca07d CL |
2455 | xprt->stat.bind_count, |
2456 | xprt->stat.sends, | |
2457 | xprt->stat.recvs, | |
2458 | xprt->stat.bad_xids, | |
2459 | xprt->stat.req_u, | |
15a45206 AA |
2460 | xprt->stat.bklog_u, |
2461 | xprt->stat.max_slots, | |
2462 | xprt->stat.sending_u, | |
2463 | xprt->stat.pending_u); | |
262ca07d CL |
2464 | } |
2465 | ||
2466 | /** | |
2467 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2468 | * @xprt: rpc_xprt struct containing statistics | |
2469 | * @seq: output file | |
2470 | * | |
2471 | */ | |
2472 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2473 | { | |
c8475461 | 2474 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2475 | long idle_time = 0; |
2476 | ||
2477 | if (xprt_connected(xprt)) | |
2478 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2479 | ||
15a45206 AA |
2480 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " |
2481 | "%llu %llu %lu %llu %llu\n", | |
fbfffbd5 | 2482 | transport->srcport, |
262ca07d CL |
2483 | xprt->stat.bind_count, |
2484 | xprt->stat.connect_count, | |
2485 | xprt->stat.connect_time, | |
2486 | idle_time, | |
2487 | xprt->stat.sends, | |
2488 | xprt->stat.recvs, | |
2489 | xprt->stat.bad_xids, | |
2490 | xprt->stat.req_u, | |
15a45206 AA |
2491 | xprt->stat.bklog_u, |
2492 | xprt->stat.max_slots, | |
2493 | xprt->stat.sending_u, | |
2494 | xprt->stat.pending_u); | |
262ca07d CL |
2495 | } |
2496 | ||
4cfc7e60 RI |
2497 | /* |
2498 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2499 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2500 | * to use the server side send routines. | |
2501 | */ | |
5a51f13a | 2502 | static void *bc_malloc(struct rpc_task *task, size_t size) |
4cfc7e60 RI |
2503 | { |
2504 | struct page *page; | |
2505 | struct rpc_buffer *buf; | |
2506 | ||
b8a13d03 WAA |
2507 | WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); |
2508 | if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) | |
2509 | return NULL; | |
4cfc7e60 | 2510 | |
b8a13d03 | 2511 | page = alloc_page(GFP_KERNEL); |
4cfc7e60 RI |
2512 | if (!page) |
2513 | return NULL; | |
2514 | ||
2515 | buf = page_address(page); | |
2516 | buf->len = PAGE_SIZE; | |
2517 | ||
2518 | return buf->data; | |
2519 | } | |
2520 | ||
2521 | /* | |
2522 | * Free the space allocated in the bc_alloc routine | |
2523 | */ | |
5a51f13a | 2524 | static void bc_free(void *buffer) |
4cfc7e60 RI |
2525 | { |
2526 | struct rpc_buffer *buf; | |
2527 | ||
2528 | if (!buffer) | |
2529 | return; | |
2530 | ||
2531 | buf = container_of(buffer, struct rpc_buffer, data); | |
2532 | free_page((unsigned long)buf); | |
2533 | } | |
2534 | ||
2535 | /* | |
2536 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2537 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2538 | */ | |
2539 | static int bc_sendto(struct rpc_rqst *req) | |
2540 | { | |
2541 | int len; | |
2542 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2543 | struct rpc_xprt *xprt = req->rq_xprt; | |
2544 | struct sock_xprt *transport = | |
2545 | container_of(xprt, struct sock_xprt, xprt); | |
2546 | struct socket *sock = transport->sock; | |
2547 | unsigned long headoff; | |
2548 | unsigned long tailoff; | |
2549 | ||
61677eee | 2550 | xs_encode_stream_record_marker(xbufp); |
4cfc7e60 RI |
2551 | |
2552 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2553 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2554 | len = svc_send_common(sock, xbufp, | |
2555 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2556 | xbufp->tail[0].iov_base, tailoff); | |
2557 | ||
2558 | if (len != xbufp->len) { | |
2559 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2560 | len = -EAGAIN; | |
2561 | } | |
2562 | ||
2563 | return len; | |
2564 | } | |
2565 | ||
2566 | /* | |
2567 | * The send routine. Borrows from svc_send | |
2568 | */ | |
2569 | static int bc_send_request(struct rpc_task *task) | |
2570 | { | |
2571 | struct rpc_rqst *req = task->tk_rqstp; | |
2572 | struct svc_xprt *xprt; | |
7fc56136 | 2573 | int len; |
4cfc7e60 RI |
2574 | |
2575 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2576 | /* | |
2577 | * Get the server socket associated with this callback xprt | |
2578 | */ | |
2579 | xprt = req->rq_xprt->bc_xprt; | |
4cfc7e60 RI |
2580 | |
2581 | /* | |
2582 | * Grab the mutex to serialize data as the connection is shared | |
2583 | * with the fore channel | |
2584 | */ | |
2585 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2586 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2587 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2588 | return -EAGAIN; | |
2589 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2590 | } | |
2591 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2592 | len = -ENOTCONN; | |
2593 | else | |
2594 | len = bc_sendto(req); | |
2595 | mutex_unlock(&xprt->xpt_mutex); | |
2596 | ||
2597 | if (len > 0) | |
2598 | len = 0; | |
2599 | ||
2600 | return len; | |
2601 | } | |
2602 | ||
2603 | /* | |
2604 | * The close routine. Since this is client initiated, we do nothing | |
2605 | */ | |
2606 | ||
2607 | static void bc_close(struct rpc_xprt *xprt) | |
2608 | { | |
4cfc7e60 RI |
2609 | } |
2610 | ||
2611 | /* | |
2612 | * The xprt destroy routine. Again, because this connection is client | |
2613 | * initiated, we do nothing | |
2614 | */ | |
2615 | ||
2616 | static void bc_destroy(struct rpc_xprt *xprt) | |
2617 | { | |
47f72efa KM |
2618 | dprintk("RPC: bc_destroy xprt %p\n", xprt); |
2619 | ||
2620 | xs_xprt_free(xprt); | |
2621 | module_put(THIS_MODULE); | |
4cfc7e60 RI |
2622 | } |
2623 | ||
176e21ee CL |
2624 | static struct rpc_xprt_ops xs_local_ops = { |
2625 | .reserve_xprt = xprt_reserve_xprt, | |
2626 | .release_xprt = xs_tcp_release_xprt, | |
f39c1bfb | 2627 | .alloc_slot = xprt_alloc_slot, |
176e21ee CL |
2628 | .rpcbind = xs_local_rpcbind, |
2629 | .set_port = xs_local_set_port, | |
dc107402 | 2630 | .connect = xs_local_connect, |
176e21ee CL |
2631 | .buf_alloc = rpc_malloc, |
2632 | .buf_free = rpc_free, | |
2633 | .send_request = xs_local_send_request, | |
2634 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2635 | .close = xs_close, | |
a1311d87 | 2636 | .destroy = xs_destroy, |
176e21ee | 2637 | .print_stats = xs_local_print_stats, |
d67fa4d8 JL |
2638 | .enable_swap = xs_enable_swap, |
2639 | .disable_swap = xs_disable_swap, | |
176e21ee CL |
2640 | }; |
2641 | ||
262965f5 | 2642 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2643 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2644 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2645 | .release_xprt = xprt_release_xprt_cong, |
f39c1bfb | 2646 | .alloc_slot = xprt_alloc_slot, |
45160d62 | 2647 | .rpcbind = rpcb_getport_async, |
92200412 | 2648 | .set_port = xs_set_port, |
262965f5 | 2649 | .connect = xs_connect, |
02107148 CL |
2650 | .buf_alloc = rpc_malloc, |
2651 | .buf_free = rpc_free, | |
262965f5 | 2652 | .send_request = xs_udp_send_request, |
fe3aca29 | 2653 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2654 | .timer = xs_udp_timer, |
a58dd398 | 2655 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2656 | .close = xs_close, |
2657 | .destroy = xs_destroy, | |
262ca07d | 2658 | .print_stats = xs_udp_print_stats, |
d67fa4d8 JL |
2659 | .enable_swap = xs_enable_swap, |
2660 | .disable_swap = xs_disable_swap, | |
4a068258 | 2661 | .inject_disconnect = xs_inject_disconnect, |
262965f5 CL |
2662 | }; |
2663 | ||
2664 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2665 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2666 | .release_xprt = xs_tcp_release_xprt, |
f39c1bfb | 2667 | .alloc_slot = xprt_lock_and_alloc_slot, |
45160d62 | 2668 | .rpcbind = rpcb_getport_async, |
92200412 | 2669 | .set_port = xs_set_port, |
0b9e7943 | 2670 | .connect = xs_connect, |
02107148 CL |
2671 | .buf_alloc = rpc_malloc, |
2672 | .buf_free = rpc_free, | |
262965f5 | 2673 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2674 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
c627d31b | 2675 | .close = xs_tcp_shutdown, |
9903cd1c | 2676 | .destroy = xs_destroy, |
262ca07d | 2677 | .print_stats = xs_tcp_print_stats, |
d67fa4d8 JL |
2678 | .enable_swap = xs_enable_swap, |
2679 | .disable_swap = xs_disable_swap, | |
4a068258 | 2680 | .inject_disconnect = xs_inject_disconnect, |
42e5c3e2 CL |
2681 | #ifdef CONFIG_SUNRPC_BACKCHANNEL |
2682 | .bc_setup = xprt_setup_bc, | |
76566773 | 2683 | .bc_up = xs_tcp_bc_up, |
42e5c3e2 CL |
2684 | .bc_free_rqst = xprt_free_bc_rqst, |
2685 | .bc_destroy = xprt_destroy_bc, | |
2686 | #endif | |
a246b010 CL |
2687 | }; |
2688 | ||
4cfc7e60 RI |
2689 | /* |
2690 | * The rpc_xprt_ops for the server backchannel | |
2691 | */ | |
2692 | ||
2693 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2694 | .reserve_xprt = xprt_reserve_xprt, | |
2695 | .release_xprt = xprt_release_xprt, | |
84e28a30 | 2696 | .alloc_slot = xprt_alloc_slot, |
4cfc7e60 RI |
2697 | .buf_alloc = bc_malloc, |
2698 | .buf_free = bc_free, | |
2699 | .send_request = bc_send_request, | |
2700 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2701 | .close = bc_close, | |
2702 | .destroy = bc_destroy, | |
2703 | .print_stats = xs_tcp_print_stats, | |
d67fa4d8 JL |
2704 | .enable_swap = xs_enable_swap, |
2705 | .disable_swap = xs_disable_swap, | |
4a068258 | 2706 | .inject_disconnect = xs_inject_disconnect, |
4cfc7e60 RI |
2707 | }; |
2708 | ||
92476850 CL |
2709 | static int xs_init_anyaddr(const int family, struct sockaddr *sap) |
2710 | { | |
2711 | static const struct sockaddr_in sin = { | |
2712 | .sin_family = AF_INET, | |
2713 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
2714 | }; | |
2715 | static const struct sockaddr_in6 sin6 = { | |
2716 | .sin6_family = AF_INET6, | |
2717 | .sin6_addr = IN6ADDR_ANY_INIT, | |
2718 | }; | |
2719 | ||
2720 | switch (family) { | |
176e21ee CL |
2721 | case AF_LOCAL: |
2722 | break; | |
92476850 CL |
2723 | case AF_INET: |
2724 | memcpy(sap, &sin, sizeof(sin)); | |
2725 | break; | |
2726 | case AF_INET6: | |
2727 | memcpy(sap, &sin6, sizeof(sin6)); | |
2728 | break; | |
2729 | default: | |
2730 | dprintk("RPC: %s: Bad address family\n", __func__); | |
2731 | return -EAFNOSUPPORT; | |
2732 | } | |
2733 | return 0; | |
2734 | } | |
2735 | ||
3c341b0b | 2736 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
d9ba131d TM |
2737 | unsigned int slot_table_size, |
2738 | unsigned int max_slot_table_size) | |
c8541ecd CL |
2739 | { |
2740 | struct rpc_xprt *xprt; | |
ffc2e518 | 2741 | struct sock_xprt *new; |
c8541ecd | 2742 | |
96802a09 | 2743 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2744 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2745 | return ERR_PTR(-EBADF); |
2746 | } | |
2747 | ||
d9ba131d TM |
2748 | xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, |
2749 | max_slot_table_size); | |
bd1722d4 | 2750 | if (xprt == NULL) { |
46121cf7 CL |
2751 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2752 | "rpc_xprt\n"); | |
c8541ecd CL |
2753 | return ERR_PTR(-ENOMEM); |
2754 | } | |
c8541ecd | 2755 | |
bd1722d4 | 2756 | new = container_of(xprt, struct sock_xprt, xprt); |
edc1b01c | 2757 | mutex_init(&new->recv_mutex); |
96802a09 FM |
2758 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2759 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2760 | if (args->srcaddr) |
fbfffbd5 | 2761 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
92476850 CL |
2762 | else { |
2763 | int err; | |
2764 | err = xs_init_anyaddr(args->dstaddr->sa_family, | |
2765 | (struct sockaddr *)&new->srcaddr); | |
2aa13531 SK |
2766 | if (err != 0) { |
2767 | xprt_free(xprt); | |
92476850 | 2768 | return ERR_PTR(err); |
2aa13531 | 2769 | } |
92476850 | 2770 | } |
c8541ecd CL |
2771 | |
2772 | return xprt; | |
2773 | } | |
2774 | ||
176e21ee CL |
2775 | static const struct rpc_timeout xs_local_default_timeout = { |
2776 | .to_initval = 10 * HZ, | |
2777 | .to_maxval = 10 * HZ, | |
2778 | .to_retries = 2, | |
2779 | }; | |
2780 | ||
2781 | /** | |
2782 | * xs_setup_local - Set up transport to use an AF_LOCAL socket | |
2783 | * @args: rpc transport creation arguments | |
2784 | * | |
2785 | * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP | |
2786 | */ | |
2787 | static struct rpc_xprt *xs_setup_local(struct xprt_create *args) | |
2788 | { | |
2789 | struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; | |
2790 | struct sock_xprt *transport; | |
2791 | struct rpc_xprt *xprt; | |
2792 | struct rpc_xprt *ret; | |
2793 | ||
d9ba131d TM |
2794 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2795 | xprt_max_tcp_slot_table_entries); | |
176e21ee CL |
2796 | if (IS_ERR(xprt)) |
2797 | return xprt; | |
2798 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2799 | ||
2800 | xprt->prot = 0; | |
2801 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2802 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2803 | ||
2804 | xprt->bind_timeout = XS_BIND_TO; | |
2805 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2806 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
2807 | ||
2808 | xprt->ops = &xs_local_ops; | |
2809 | xprt->timeout = &xs_local_default_timeout; | |
2810 | ||
a2648094 | 2811 | INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn); |
93dc41bd N |
2812 | INIT_DELAYED_WORK(&transport->connect_worker, |
2813 | xs_dummy_setup_socket); | |
2814 | ||
176e21ee CL |
2815 | switch (sun->sun_family) { |
2816 | case AF_LOCAL: | |
2817 | if (sun->sun_path[0] != '/') { | |
2818 | dprintk("RPC: bad AF_LOCAL address: %s\n", | |
2819 | sun->sun_path); | |
2820 | ret = ERR_PTR(-EINVAL); | |
2821 | goto out_err; | |
2822 | } | |
2823 | xprt_set_bound(xprt); | |
176e21ee | 2824 | xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); |
7073ea87 BF |
2825 | ret = ERR_PTR(xs_local_setup_socket(transport)); |
2826 | if (ret) | |
2827 | goto out_err; | |
176e21ee CL |
2828 | break; |
2829 | default: | |
2830 | ret = ERR_PTR(-EAFNOSUPPORT); | |
2831 | goto out_err; | |
2832 | } | |
2833 | ||
2834 | dprintk("RPC: set up xprt to %s via AF_LOCAL\n", | |
2835 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2836 | ||
2837 | if (try_module_get(THIS_MODULE)) | |
2838 | return xprt; | |
2839 | ret = ERR_PTR(-EINVAL); | |
2840 | out_err: | |
315f3812 | 2841 | xs_xprt_free(xprt); |
176e21ee CL |
2842 | return ret; |
2843 | } | |
2844 | ||
2881ae74 TM |
2845 | static const struct rpc_timeout xs_udp_default_timeout = { |
2846 | .to_initval = 5 * HZ, | |
2847 | .to_maxval = 30 * HZ, | |
2848 | .to_increment = 5 * HZ, | |
2849 | .to_retries = 5, | |
2850 | }; | |
2851 | ||
9903cd1c CL |
2852 | /** |
2853 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2854 | * @args: rpc transport creation arguments |
9903cd1c CL |
2855 | * |
2856 | */ | |
483066d6 | 2857 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2858 | { |
8f9d5b1a | 2859 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2860 | struct rpc_xprt *xprt; |
c8475461 | 2861 | struct sock_xprt *transport; |
0a68b0be | 2862 | struct rpc_xprt *ret; |
a246b010 | 2863 | |
d9ba131d TM |
2864 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, |
2865 | xprt_udp_slot_table_entries); | |
c8541ecd CL |
2866 | if (IS_ERR(xprt)) |
2867 | return xprt; | |
c8475461 | 2868 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2869 | |
ec739ef0 | 2870 | xprt->prot = IPPROTO_UDP; |
808012fb | 2871 | xprt->tsh_size = 0; |
a246b010 CL |
2872 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2873 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2874 | ||
03bf4b70 | 2875 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2876 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2877 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2878 | |
262965f5 | 2879 | xprt->ops = &xs_udp_ops; |
a246b010 | 2880 | |
ba7392bb | 2881 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2882 | |
f9b2ee71 | 2883 | INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); |
edc1b01c TM |
2884 | INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); |
2885 | ||
8f9d5b1a CL |
2886 | switch (addr->sa_family) { |
2887 | case AF_INET: | |
2888 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2889 | xprt_set_bound(xprt); | |
2890 | ||
9dc3b095 | 2891 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2892 | break; |
2893 | case AF_INET6: | |
2894 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2895 | xprt_set_bound(xprt); | |
2896 | ||
9dc3b095 | 2897 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2898 | break; |
2899 | default: | |
0a68b0be BF |
2900 | ret = ERR_PTR(-EAFNOSUPPORT); |
2901 | goto out_err; | |
8f9d5b1a CL |
2902 | } |
2903 | ||
c740eff8 CL |
2904 | if (xprt_bound(xprt)) |
2905 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2906 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2907 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2908 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2909 | else | |
2910 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2911 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2912 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2913 | |
bc25571e TT |
2914 | if (try_module_get(THIS_MODULE)) |
2915 | return xprt; | |
0a68b0be BF |
2916 | ret = ERR_PTR(-EINVAL); |
2917 | out_err: | |
315f3812 | 2918 | xs_xprt_free(xprt); |
0a68b0be | 2919 | return ret; |
a246b010 CL |
2920 | } |
2921 | ||
2881ae74 TM |
2922 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2923 | .to_initval = 60 * HZ, | |
2924 | .to_maxval = 60 * HZ, | |
2925 | .to_retries = 2, | |
2926 | }; | |
2927 | ||
9903cd1c CL |
2928 | /** |
2929 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2930 | * @args: rpc transport creation arguments |
9903cd1c CL |
2931 | * |
2932 | */ | |
483066d6 | 2933 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2934 | { |
8f9d5b1a | 2935 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2936 | struct rpc_xprt *xprt; |
c8475461 | 2937 | struct sock_xprt *transport; |
0a68b0be | 2938 | struct rpc_xprt *ret; |
b7993ceb TM |
2939 | unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; |
2940 | ||
2941 | if (args->flags & XPRT_CREATE_INFINITE_SLOTS) | |
2942 | max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; | |
a246b010 | 2943 | |
d9ba131d | 2944 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
b7993ceb | 2945 | max_slot_table_size); |
c8541ecd CL |
2946 | if (IS_ERR(xprt)) |
2947 | return xprt; | |
c8475461 | 2948 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2949 | |
ec739ef0 | 2950 | xprt->prot = IPPROTO_TCP; |
808012fb | 2951 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2952 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2953 | |
03bf4b70 | 2954 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2955 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2956 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2957 | |
262965f5 | 2958 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2959 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2960 | |
edc1b01c TM |
2961 | INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn); |
2962 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); | |
2963 | ||
8f9d5b1a CL |
2964 | switch (addr->sa_family) { |
2965 | case AF_INET: | |
2966 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2967 | xprt_set_bound(xprt); | |
2968 | ||
9dc3b095 | 2969 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2970 | break; |
2971 | case AF_INET6: | |
2972 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2973 | xprt_set_bound(xprt); | |
2974 | ||
9dc3b095 | 2975 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2976 | break; |
2977 | default: | |
0a68b0be BF |
2978 | ret = ERR_PTR(-EAFNOSUPPORT); |
2979 | goto out_err; | |
8f9d5b1a CL |
2980 | } |
2981 | ||
c740eff8 CL |
2982 | if (xprt_bound(xprt)) |
2983 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2984 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2985 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2986 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2987 | else | |
2988 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2989 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2990 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2991 | ||
bc25571e TT |
2992 | if (try_module_get(THIS_MODULE)) |
2993 | return xprt; | |
0a68b0be BF |
2994 | ret = ERR_PTR(-EINVAL); |
2995 | out_err: | |
315f3812 | 2996 | xs_xprt_free(xprt); |
0a68b0be | 2997 | return ret; |
a246b010 | 2998 | } |
282b32e1 | 2999 | |
f300baba AB |
3000 | /** |
3001 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
3002 | * @args: rpc transport creation arguments | |
3003 | * | |
3004 | */ | |
3005 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
3006 | { | |
3007 | struct sockaddr *addr = args->dstaddr; | |
3008 | struct rpc_xprt *xprt; | |
3009 | struct sock_xprt *transport; | |
3010 | struct svc_sock *bc_sock; | |
0a68b0be | 3011 | struct rpc_xprt *ret; |
f300baba | 3012 | |
d9ba131d TM |
3013 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
3014 | xprt_tcp_slot_table_entries); | |
f300baba AB |
3015 | if (IS_ERR(xprt)) |
3016 | return xprt; | |
3017 | transport = container_of(xprt, struct sock_xprt, xprt); | |
3018 | ||
3019 | xprt->prot = IPPROTO_TCP; | |
3020 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
3021 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
3022 | xprt->timeout = &xs_tcp_default_timeout; | |
3023 | ||
3024 | /* backchannel */ | |
3025 | xprt_set_bound(xprt); | |
3026 | xprt->bind_timeout = 0; | |
f300baba AB |
3027 | xprt->reestablish_timeout = 0; |
3028 | xprt->idle_timeout = 0; | |
3029 | ||
f300baba AB |
3030 | xprt->ops = &bc_tcp_ops; |
3031 | ||
3032 | switch (addr->sa_family) { | |
3033 | case AF_INET: | |
3034 | xs_format_peer_addresses(xprt, "tcp", | |
3035 | RPCBIND_NETID_TCP); | |
3036 | break; | |
3037 | case AF_INET6: | |
3038 | xs_format_peer_addresses(xprt, "tcp", | |
3039 | RPCBIND_NETID_TCP6); | |
3040 | break; | |
3041 | default: | |
0a68b0be BF |
3042 | ret = ERR_PTR(-EAFNOSUPPORT); |
3043 | goto out_err; | |
f300baba AB |
3044 | } |
3045 | ||
50fa0d40 PE |
3046 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
3047 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
3048 | xprt->address_strings[RPC_DISPLAY_PORT], | |
3049 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
f300baba | 3050 | |
99de8ea9 BF |
3051 | /* |
3052 | * Once we've associated a backchannel xprt with a connection, | |
28303ca3 WM |
3053 | * we want to keep it around as long as the connection lasts, |
3054 | * in case we need to start using it for a backchannel again; | |
3055 | * this reference won't be dropped until bc_xprt is destroyed. | |
99de8ea9 BF |
3056 | */ |
3057 | xprt_get(xprt); | |
3058 | args->bc_xprt->xpt_bc_xprt = xprt; | |
3059 | xprt->bc_xprt = args->bc_xprt; | |
3060 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
3061 | transport->sock = bc_sock->sk_sock; | |
3062 | transport->inet = bc_sock->sk_sk; | |
3063 | ||
f300baba AB |
3064 | /* |
3065 | * Since we don't want connections for the backchannel, we set | |
3066 | * the xprt status to connected | |
3067 | */ | |
3068 | xprt_set_connected(xprt); | |
3069 | ||
f300baba AB |
3070 | if (try_module_get(THIS_MODULE)) |
3071 | return xprt; | |
642aab58 KM |
3072 | |
3073 | args->bc_xprt->xpt_bc_xprt = NULL; | |
99de8ea9 | 3074 | xprt_put(xprt); |
0a68b0be BF |
3075 | ret = ERR_PTR(-EINVAL); |
3076 | out_err: | |
315f3812 | 3077 | xs_xprt_free(xprt); |
0a68b0be | 3078 | return ret; |
f300baba AB |
3079 | } |
3080 | ||
176e21ee CL |
3081 | static struct xprt_class xs_local_transport = { |
3082 | .list = LIST_HEAD_INIT(xs_local_transport.list), | |
3083 | .name = "named UNIX socket", | |
3084 | .owner = THIS_MODULE, | |
3085 | .ident = XPRT_TRANSPORT_LOCAL, | |
3086 | .setup = xs_setup_local, | |
3087 | }; | |
3088 | ||
bc25571e TT |
3089 | static struct xprt_class xs_udp_transport = { |
3090 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
3091 | .name = "udp", | |
3092 | .owner = THIS_MODULE, | |
f300baba | 3093 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
3094 | .setup = xs_setup_udp, |
3095 | }; | |
3096 | ||
3097 | static struct xprt_class xs_tcp_transport = { | |
3098 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
3099 | .name = "tcp", | |
3100 | .owner = THIS_MODULE, | |
f300baba | 3101 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
3102 | .setup = xs_setup_tcp, |
3103 | }; | |
3104 | ||
f300baba AB |
3105 | static struct xprt_class xs_bc_tcp_transport = { |
3106 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
3107 | .name = "tcp NFSv4.1 backchannel", | |
3108 | .owner = THIS_MODULE, | |
3109 | .ident = XPRT_TRANSPORT_BC_TCP, | |
3110 | .setup = xs_setup_bc_tcp, | |
3111 | }; | |
3112 | ||
282b32e1 | 3113 | /** |
bc25571e | 3114 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
3115 | * |
3116 | */ | |
3117 | int init_socket_xprt(void) | |
3118 | { | |
f895b252 | 3119 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
2b1bec5f | 3120 | if (!sunrpc_table_header) |
0b4d4147 | 3121 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
3122 | #endif |
3123 | ||
176e21ee | 3124 | xprt_register_transport(&xs_local_transport); |
bc25571e TT |
3125 | xprt_register_transport(&xs_udp_transport); |
3126 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 3127 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 3128 | |
282b32e1 CL |
3129 | return 0; |
3130 | } | |
3131 | ||
3132 | /** | |
bc25571e | 3133 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
3134 | * |
3135 | */ | |
3136 | void cleanup_socket_xprt(void) | |
3137 | { | |
f895b252 | 3138 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
fbf76683 CL |
3139 | if (sunrpc_table_header) { |
3140 | unregister_sysctl_table(sunrpc_table_header); | |
3141 | sunrpc_table_header = NULL; | |
3142 | } | |
3143 | #endif | |
bc25571e | 3144 | |
176e21ee | 3145 | xprt_unregister_transport(&xs_local_transport); |
bc25571e TT |
3146 | xprt_unregister_transport(&xs_udp_transport); |
3147 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 3148 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 3149 | } |
cbf11071 | 3150 | |
9bbb9e5a RR |
3151 | static int param_set_uint_minmax(const char *val, |
3152 | const struct kernel_param *kp, | |
cbf11071 TM |
3153 | unsigned int min, unsigned int max) |
3154 | { | |
00cfaa94 | 3155 | unsigned int num; |
cbf11071 TM |
3156 | int ret; |
3157 | ||
3158 | if (!val) | |
3159 | return -EINVAL; | |
00cfaa94 | 3160 | ret = kstrtouint(val, 0, &num); |
cbf11071 TM |
3161 | if (ret == -EINVAL || num < min || num > max) |
3162 | return -EINVAL; | |
3163 | *((unsigned int *)kp->arg) = num; | |
3164 | return 0; | |
3165 | } | |
3166 | ||
9bbb9e5a | 3167 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
cbf11071 TM |
3168 | { |
3169 | return param_set_uint_minmax(val, kp, | |
3170 | RPC_MIN_RESVPORT, | |
3171 | RPC_MAX_RESVPORT); | |
3172 | } | |
3173 | ||
9c27847d | 3174 | static const struct kernel_param_ops param_ops_portnr = { |
9bbb9e5a RR |
3175 | .set = param_set_portnr, |
3176 | .get = param_get_uint, | |
3177 | }; | |
3178 | ||
cbf11071 TM |
3179 | #define param_check_portnr(name, p) \ |
3180 | __param_check(name, p, unsigned int); | |
3181 | ||
3182 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
3183 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
3184 | ||
9bbb9e5a RR |
3185 | static int param_set_slot_table_size(const char *val, |
3186 | const struct kernel_param *kp) | |
cbf11071 TM |
3187 | { |
3188 | return param_set_uint_minmax(val, kp, | |
3189 | RPC_MIN_SLOT_TABLE, | |
3190 | RPC_MAX_SLOT_TABLE); | |
3191 | } | |
3192 | ||
9c27847d | 3193 | static const struct kernel_param_ops param_ops_slot_table_size = { |
9bbb9e5a RR |
3194 | .set = param_set_slot_table_size, |
3195 | .get = param_get_uint, | |
3196 | }; | |
3197 | ||
cbf11071 TM |
3198 | #define param_check_slot_table_size(name, p) \ |
3199 | __param_check(name, p, unsigned int); | |
3200 | ||
d9ba131d TM |
3201 | static int param_set_max_slot_table_size(const char *val, |
3202 | const struct kernel_param *kp) | |
3203 | { | |
3204 | return param_set_uint_minmax(val, kp, | |
3205 | RPC_MIN_SLOT_TABLE, | |
3206 | RPC_MAX_SLOT_TABLE_LIMIT); | |
3207 | } | |
3208 | ||
9c27847d | 3209 | static const struct kernel_param_ops param_ops_max_slot_table_size = { |
d9ba131d TM |
3210 | .set = param_set_max_slot_table_size, |
3211 | .get = param_get_uint, | |
3212 | }; | |
3213 | ||
3214 | #define param_check_max_slot_table_size(name, p) \ | |
3215 | __param_check(name, p, unsigned int); | |
3216 | ||
cbf11071 TM |
3217 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
3218 | slot_table_size, 0644); | |
d9ba131d TM |
3219 | module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, |
3220 | max_slot_table_size, 0644); | |
cbf11071 TM |
3221 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
3222 | slot_table_size, 0644); | |
3223 |