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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 | |
24c5684b TM |
401 | if (base != 0) { |
402 | addr = NULL; | |
403 | addrlen = 0; | |
404 | } | |
262965f5 | 405 | |
24c5684b TM |
406 | if (base < xdr->head[0].iov_len || addr != NULL) { |
407 | unsigned int len = xdr->head[0].iov_len - base; | |
408 | remainder -= len; | |
409 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
410 | if (remainder == 0 || err != len) | |
a246b010 | 411 | goto out; |
f279cd00 | 412 | *sent_p += err; |
a246b010 CL |
413 | base = 0; |
414 | } else | |
24c5684b | 415 | base -= xdr->head[0].iov_len; |
a246b010 | 416 | |
24c5684b TM |
417 | if (base < xdr->page_len) { |
418 | unsigned int len = xdr->page_len - base; | |
419 | remainder -= len; | |
f279cd00 JB |
420 | err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent); |
421 | *sent_p += sent; | |
422 | if (remainder == 0 || sent != len) | |
a246b010 CL |
423 | goto out; |
424 | base = 0; | |
24c5684b TM |
425 | } else |
426 | base -= xdr->page_len; | |
427 | ||
428 | if (base >= xdr->tail[0].iov_len) | |
f279cd00 | 429 | return 0; |
24c5684b | 430 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); |
a246b010 | 431 | out: |
f279cd00 JB |
432 | if (err > 0) { |
433 | *sent_p += err; | |
434 | err = 0; | |
435 | } | |
436 | return err; | |
a246b010 CL |
437 | } |
438 | ||
b6ddf64f TM |
439 | static void xs_nospace_callback(struct rpc_task *task) |
440 | { | |
441 | struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); | |
442 | ||
443 | transport->inet->sk_write_pending--; | |
b6ddf64f TM |
444 | } |
445 | ||
9903cd1c | 446 | /** |
262965f5 CL |
447 | * xs_nospace - place task on wait queue if transmit was incomplete |
448 | * @task: task to put to sleep | |
9903cd1c | 449 | * |
a246b010 | 450 | */ |
5e3771ce | 451 | static int xs_nospace(struct rpc_task *task) |
a246b010 | 452 | { |
262965f5 CL |
453 | struct rpc_rqst *req = task->tk_rqstp; |
454 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 455 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
06ea0bfe | 456 | struct sock *sk = transport->inet; |
24ca9a84 | 457 | int ret = -EAGAIN; |
a246b010 | 458 | |
46121cf7 | 459 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
460 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
461 | req->rq_slen); | |
462 | ||
b6ddf64f TM |
463 | /* Protect against races with write_space */ |
464 | spin_lock_bh(&xprt->transport_lock); | |
465 | ||
466 | /* Don't race with disconnect */ | |
467 | if (xprt_connected(xprt)) { | |
13331a55 TM |
468 | /* wait for more buffer space */ |
469 | sk->sk_write_pending++; | |
470 | xprt_wait_for_buffer_space(task, xs_nospace_callback); | |
471 | } else | |
5e3771ce | 472 | ret = -ENOTCONN; |
262965f5 | 473 | |
b6ddf64f | 474 | spin_unlock_bh(&xprt->transport_lock); |
06ea0bfe TM |
475 | |
476 | /* Race breaker in case memory is freed before above code is called */ | |
477 | sk->sk_write_space(sk); | |
5e3771ce | 478 | return ret; |
262965f5 CL |
479 | } |
480 | ||
61677eee CL |
481 | /* |
482 | * Construct a stream transport record marker in @buf. | |
483 | */ | |
484 | static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) | |
485 | { | |
486 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
487 | rpc_fraghdr *base = buf->head[0].iov_base; | |
488 | *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); | |
489 | } | |
490 | ||
176e21ee CL |
491 | /** |
492 | * xs_local_send_request - write an RPC request to an AF_LOCAL socket | |
493 | * @task: RPC task that manages the state of an RPC request | |
494 | * | |
495 | * Return values: | |
496 | * 0: The request has been sent | |
497 | * EAGAIN: The socket was blocked, please call again later to | |
498 | * complete the request | |
499 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
500 | * other: Some other error occured, the request was not sent | |
501 | */ | |
502 | static int xs_local_send_request(struct rpc_task *task) | |
503 | { | |
504 | struct rpc_rqst *req = task->tk_rqstp; | |
505 | struct rpc_xprt *xprt = req->rq_xprt; | |
506 | struct sock_xprt *transport = | |
507 | container_of(xprt, struct sock_xprt, xprt); | |
508 | struct xdr_buf *xdr = &req->rq_snd_buf; | |
509 | int status; | |
f279cd00 | 510 | int sent = 0; |
176e21ee CL |
511 | |
512 | xs_encode_stream_record_marker(&req->rq_snd_buf); | |
513 | ||
514 | xs_pktdump("packet data:", | |
515 | req->rq_svec->iov_base, req->rq_svec->iov_len); | |
516 | ||
f279cd00 JB |
517 | status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent, |
518 | true, &sent); | |
176e21ee CL |
519 | dprintk("RPC: %s(%u) = %d\n", |
520 | __func__, xdr->len - req->rq_bytes_sent, status); | |
743c69e7 N |
521 | |
522 | if (status == -EAGAIN && sock_writeable(transport->inet)) | |
523 | status = -ENOBUFS; | |
524 | ||
f279cd00 JB |
525 | if (likely(sent > 0) || status == 0) { |
526 | req->rq_bytes_sent += sent; | |
527 | req->rq_xmit_bytes_sent += sent; | |
176e21ee CL |
528 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
529 | req->rq_bytes_sent = 0; | |
530 | return 0; | |
531 | } | |
532 | status = -EAGAIN; | |
533 | } | |
534 | ||
535 | switch (status) { | |
3601c4a9 | 536 | case -ENOBUFS: |
b5872f0c | 537 | break; |
176e21ee CL |
538 | case -EAGAIN: |
539 | status = xs_nospace(task); | |
540 | break; | |
541 | default: | |
542 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
543 | -status); | |
544 | case -EPIPE: | |
545 | xs_close(xprt); | |
546 | status = -ENOTCONN; | |
547 | } | |
548 | ||
549 | return status; | |
550 | } | |
551 | ||
262965f5 CL |
552 | /** |
553 | * xs_udp_send_request - write an RPC request to a UDP socket | |
554 | * @task: address of RPC task that manages the state of an RPC request | |
555 | * | |
556 | * Return values: | |
557 | * 0: The request has been sent | |
558 | * EAGAIN: The socket was blocked, please call again later to | |
559 | * complete the request | |
560 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 561 | * other: Some other error occurred, the request was not sent |
262965f5 CL |
562 | */ |
563 | static int xs_udp_send_request(struct rpc_task *task) | |
564 | { | |
565 | struct rpc_rqst *req = task->tk_rqstp; | |
566 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 567 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 568 | struct xdr_buf *xdr = &req->rq_snd_buf; |
f279cd00 | 569 | int sent = 0; |
262965f5 | 570 | int status; |
a246b010 | 571 | |
9903cd1c | 572 | xs_pktdump("packet data:", |
a246b010 CL |
573 | req->rq_svec->iov_base, |
574 | req->rq_svec->iov_len); | |
575 | ||
01d37c42 TM |
576 | if (!xprt_bound(xprt)) |
577 | return -ENOTCONN; | |
f279cd00 JB |
578 | status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, |
579 | xdr, req->rq_bytes_sent, true, &sent); | |
a246b010 | 580 | |
46121cf7 | 581 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 582 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 583 | |
3dedbb5c JB |
584 | /* firewall is blocking us, don't return -EAGAIN or we end up looping */ |
585 | if (status == -EPERM) | |
586 | goto process_status; | |
587 | ||
743c69e7 N |
588 | if (status == -EAGAIN && sock_writeable(transport->inet)) |
589 | status = -ENOBUFS; | |
590 | ||
f279cd00 JB |
591 | if (sent > 0 || status == 0) { |
592 | req->rq_xmit_bytes_sent += sent; | |
593 | if (sent >= req->rq_slen) | |
2199700f TM |
594 | return 0; |
595 | /* Still some bytes left; set up for a retry later. */ | |
262965f5 | 596 | status = -EAGAIN; |
2199700f | 597 | } |
a246b010 | 598 | |
3dedbb5c | 599 | process_status: |
262965f5 | 600 | switch (status) { |
fba91afb TM |
601 | case -ENOTSOCK: |
602 | status = -ENOTCONN; | |
603 | /* Should we call xs_close() here? */ | |
604 | break; | |
b6ddf64f | 605 | case -EAGAIN: |
5e3771ce | 606 | status = xs_nospace(task); |
b6ddf64f | 607 | break; |
262965f5 | 608 | case -ENETUNREACH: |
3601c4a9 | 609 | case -ENOBUFS: |
262965f5 | 610 | case -EPIPE: |
a246b010 | 611 | case -ECONNREFUSED: |
3dedbb5c | 612 | case -EPERM: |
a246b010 | 613 | /* When the server has died, an ICMP port unreachable message |
9903cd1c | 614 | * prompts ECONNREFUSED. */ |
13331a55 TM |
615 | break; |
616 | default: | |
617 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
618 | -status); | |
a246b010 | 619 | } |
5fe46e9d | 620 | |
262965f5 | 621 | return status; |
a246b010 CL |
622 | } |
623 | ||
9903cd1c | 624 | /** |
262965f5 | 625 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
626 | * @task: address of RPC task that manages the state of an RPC request |
627 | * | |
628 | * Return values: | |
262965f5 CL |
629 | * 0: The request has been sent |
630 | * EAGAIN: The socket was blocked, please call again later to | |
631 | * complete the request | |
632 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
25985edc | 633 | * other: Some other error occurred, the request was not sent |
9903cd1c CL |
634 | * |
635 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 636 | * if sendmsg is not able to make progress? |
9903cd1c | 637 | */ |
262965f5 | 638 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
639 | { |
640 | struct rpc_rqst *req = task->tk_rqstp; | |
641 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 642 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 643 | struct xdr_buf *xdr = &req->rq_snd_buf; |
a6b31d18 | 644 | bool zerocopy = true; |
b595bb15 | 645 | int status; |
f279cd00 | 646 | int sent; |
a246b010 | 647 | |
61677eee | 648 | xs_encode_stream_record_marker(&req->rq_snd_buf); |
a246b010 | 649 | |
262965f5 CL |
650 | xs_pktdump("packet data:", |
651 | req->rq_svec->iov_base, | |
652 | req->rq_svec->iov_len); | |
a6b31d18 TM |
653 | /* Don't use zero copy if this is a resend. If the RPC call |
654 | * completes while the socket holds a reference to the pages, | |
655 | * then we may end up resending corrupted data. | |
656 | */ | |
657 | if (task->tk_flags & RPC_TASK_SENT) | |
658 | zerocopy = false; | |
a246b010 CL |
659 | |
660 | /* Continue transmitting the packet/record. We must be careful | |
661 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 662 | * called sendmsg(). */ |
a246b010 | 663 | while (1) { |
f279cd00 JB |
664 | sent = 0; |
665 | status = xs_sendpages(transport->sock, NULL, 0, xdr, | |
666 | req->rq_bytes_sent, zerocopy, &sent); | |
a246b010 | 667 | |
46121cf7 | 668 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 669 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 670 | |
262965f5 CL |
671 | /* If we've sent the entire packet, immediately |
672 | * reset the count of bytes sent. */ | |
f279cd00 JB |
673 | req->rq_bytes_sent += sent; |
674 | req->rq_xmit_bytes_sent += sent; | |
262965f5 CL |
675 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
676 | req->rq_bytes_sent = 0; | |
677 | return 0; | |
678 | } | |
a246b010 | 679 | |
f580dd04 TM |
680 | if (status < 0) |
681 | break; | |
682 | if (sent == 0) { | |
683 | status = -EAGAIN; | |
684 | break; | |
685 | } | |
a246b010 | 686 | } |
743c69e7 N |
687 | if (status == -EAGAIN && sk_stream_is_writeable(transport->inet)) |
688 | status = -ENOBUFS; | |
a246b010 | 689 | |
262965f5 | 690 | switch (status) { |
fba91afb TM |
691 | case -ENOTSOCK: |
692 | status = -ENOTCONN; | |
693 | /* Should we call xs_close() here? */ | |
694 | break; | |
262965f5 | 695 | case -EAGAIN: |
5e3771ce | 696 | status = xs_nospace(task); |
262965f5 | 697 | break; |
262965f5 | 698 | case -ECONNRESET: |
2a9e1cfa | 699 | case -ECONNREFUSED: |
262965f5 | 700 | case -ENOTCONN: |
3913c78c | 701 | case -EADDRINUSE: |
b5872f0c | 702 | case -ENOBUFS: |
b9d2bb2e | 703 | case -EPIPE: |
13331a55 TM |
704 | break; |
705 | default: | |
706 | dprintk("RPC: sendmsg returned unrecognized error %d\n", | |
707 | -status); | |
a246b010 | 708 | } |
5fe46e9d | 709 | |
a246b010 CL |
710 | return status; |
711 | } | |
712 | ||
e0ab53de TM |
713 | /** |
714 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
715 | * @xprt: transport | |
716 | * @task: rpc task | |
717 | * | |
718 | * This cleans up if an error causes us to abort the transmission of a request. | |
719 | * In this case, the socket may need to be reset in order to avoid confusing | |
720 | * the server. | |
721 | */ | |
722 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
723 | { | |
724 | struct rpc_rqst *req; | |
725 | ||
726 | if (task != xprt->snd_task) | |
727 | return; | |
728 | if (task == NULL) | |
729 | goto out_release; | |
730 | req = task->tk_rqstp; | |
43cedbf0 TM |
731 | if (req == NULL) |
732 | goto out_release; | |
e0ab53de TM |
733 | if (req->rq_bytes_sent == 0) |
734 | goto out_release; | |
735 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
736 | goto out_release; | |
a4f0835c | 737 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
e0ab53de TM |
738 | out_release: |
739 | xprt_release_xprt(xprt, task); | |
740 | } | |
741 | ||
2a9e1cfa TM |
742 | static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
743 | { | |
744 | transport->old_data_ready = sk->sk_data_ready; | |
745 | transport->old_state_change = sk->sk_state_change; | |
746 | transport->old_write_space = sk->sk_write_space; | |
2118071d | 747 | transport->old_error_report = sk->sk_error_report; |
2a9e1cfa TM |
748 | } |
749 | ||
750 | static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) | |
751 | { | |
752 | sk->sk_data_ready = transport->old_data_ready; | |
753 | sk->sk_state_change = transport->old_state_change; | |
754 | sk->sk_write_space = transport->old_write_space; | |
2118071d TM |
755 | sk->sk_error_report = transport->old_error_report; |
756 | } | |
757 | ||
b70ae915 TM |
758 | static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) |
759 | { | |
760 | smp_mb__before_atomic(); | |
761 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
762 | clear_bit(XPRT_CLOSING, &xprt->state); | |
763 | smp_mb__after_atomic(); | |
764 | } | |
765 | ||
766 | static void xs_sock_mark_closed(struct rpc_xprt *xprt) | |
767 | { | |
768 | xs_sock_reset_connection_flags(xprt); | |
769 | /* Mark transport as closed and wake up all pending tasks */ | |
770 | xprt_disconnect_done(xprt); | |
771 | } | |
772 | ||
2118071d TM |
773 | /** |
774 | * xs_error_report - callback to handle TCP socket state errors | |
775 | * @sk: socket | |
776 | * | |
777 | * Note: we don't call sock_error() since there may be a rpc_task | |
778 | * using the socket, and so we don't want to clear sk->sk_err. | |
779 | */ | |
780 | static void xs_error_report(struct sock *sk) | |
781 | { | |
782 | struct rpc_xprt *xprt; | |
783 | int err; | |
784 | ||
785 | read_lock_bh(&sk->sk_callback_lock); | |
786 | if (!(xprt = xprt_from_sock(sk))) | |
787 | goto out; | |
788 | ||
789 | err = -sk->sk_err; | |
790 | if (err == 0) | |
791 | goto out; | |
b70ae915 TM |
792 | /* Is this a reset event? */ |
793 | if (sk->sk_state == TCP_CLOSE) | |
794 | xs_sock_mark_closed(xprt); | |
2118071d TM |
795 | dprintk("RPC: xs_error_report client %p, error=%d...\n", |
796 | xprt, -err); | |
e8353c76 | 797 | trace_rpc_socket_error(xprt, sk->sk_socket, err); |
2118071d TM |
798 | xprt_wake_pending_tasks(xprt, err); |
799 | out: | |
800 | read_unlock_bh(&sk->sk_callback_lock); | |
2a9e1cfa TM |
801 | } |
802 | ||
fe315e76 | 803 | static void xs_reset_transport(struct sock_xprt *transport) |
a246b010 | 804 | { |
ee0ac0c2 CL |
805 | struct socket *sock = transport->sock; |
806 | struct sock *sk = transport->inet; | |
6cc7e908 | 807 | struct rpc_xprt *xprt = &transport->xprt; |
a246b010 | 808 | |
fe315e76 CL |
809 | if (sk == NULL) |
810 | return; | |
9903cd1c | 811 | |
264d1df3 JL |
812 | if (atomic_read(&transport->xprt.swapper)) |
813 | sk_clear_memalloc(sk); | |
814 | ||
09939204 TM |
815 | kernel_sock_shutdown(sock, SHUT_RDWR); |
816 | ||
edc1b01c | 817 | mutex_lock(&transport->recv_mutex); |
a246b010 | 818 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
819 | transport->inet = NULL; |
820 | transport->sock = NULL; | |
a246b010 | 821 | |
9903cd1c | 822 | sk->sk_user_data = NULL; |
2a9e1cfa TM |
823 | |
824 | xs_restore_old_callbacks(transport, sk); | |
0c78789e | 825 | xprt_clear_connected(xprt); |
a246b010 | 826 | write_unlock_bh(&sk->sk_callback_lock); |
6cc7e908 | 827 | xs_sock_reset_connection_flags(xprt); |
edc1b01c | 828 | mutex_unlock(&transport->recv_mutex); |
a246b010 | 829 | |
6cc7e908 | 830 | trace_rpc_socket_close(xprt, sock); |
a246b010 | 831 | sock_release(sock); |
fe315e76 CL |
832 | } |
833 | ||
834 | /** | |
835 | * xs_close - close a socket | |
836 | * @xprt: transport | |
837 | * | |
838 | * This is used when all requests are complete; ie, no DRC state remains | |
839 | * on the server we want to save. | |
f75e6745 TM |
840 | * |
841 | * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with | |
842 | * xs_reset_transport() zeroing the socket from underneath a writer. | |
fe315e76 CL |
843 | */ |
844 | static void xs_close(struct rpc_xprt *xprt) | |
845 | { | |
846 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
847 | ||
848 | dprintk("RPC: xs_close xprt %p\n", xprt); | |
849 | ||
850 | xs_reset_transport(transport); | |
61d0a8e6 | 851 | xprt->reestablish_timeout = 0; |
fe315e76 | 852 | |
62da3b24 | 853 | xprt_disconnect_done(xprt); |
a246b010 CL |
854 | } |
855 | ||
4a068258 CL |
856 | static void xs_inject_disconnect(struct rpc_xprt *xprt) |
857 | { | |
858 | dprintk("RPC: injecting transport disconnect on xprt=%p\n", | |
859 | xprt); | |
860 | xprt_disconnect_done(xprt); | |
861 | } | |
862 | ||
315f3812 KM |
863 | static void xs_xprt_free(struct rpc_xprt *xprt) |
864 | { | |
865 | xs_free_peer_addresses(xprt); | |
866 | xprt_free(xprt); | |
867 | } | |
868 | ||
9903cd1c CL |
869 | /** |
870 | * xs_destroy - prepare to shutdown a transport | |
871 | * @xprt: doomed transport | |
872 | * | |
873 | */ | |
874 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 875 | { |
03c78827 TM |
876 | struct sock_xprt *transport = container_of(xprt, |
877 | struct sock_xprt, xprt); | |
46121cf7 | 878 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 879 | |
03c78827 | 880 | cancel_delayed_work_sync(&transport->connect_worker); |
a1311d87 | 881 | xs_close(xprt); |
edc1b01c | 882 | cancel_work_sync(&transport->recv_worker); |
315f3812 | 883 | xs_xprt_free(xprt); |
a1311d87 | 884 | module_put(THIS_MODULE); |
a246b010 CL |
885 | } |
886 | ||
176e21ee CL |
887 | static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) |
888 | { | |
889 | struct xdr_skb_reader desc = { | |
890 | .skb = skb, | |
891 | .offset = sizeof(rpc_fraghdr), | |
892 | .count = skb->len - sizeof(rpc_fraghdr), | |
893 | }; | |
894 | ||
895 | if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) | |
896 | return -1; | |
897 | if (desc.count) | |
898 | return -1; | |
899 | return 0; | |
900 | } | |
901 | ||
902 | /** | |
a2648094 TM |
903 | * xs_local_data_read_skb |
904 | * @xprt: transport | |
905 | * @sk: socket | |
906 | * @skb: skbuff | |
176e21ee CL |
907 | * |
908 | * Currently this assumes we can read the whole reply in a single gulp. | |
909 | */ | |
a2648094 TM |
910 | static void xs_local_data_read_skb(struct rpc_xprt *xprt, |
911 | struct sock *sk, | |
912 | struct sk_buff *skb) | |
176e21ee CL |
913 | { |
914 | struct rpc_task *task; | |
176e21ee | 915 | struct rpc_rqst *rovr; |
a2648094 | 916 | int repsize, copied; |
176e21ee CL |
917 | u32 _xid; |
918 | __be32 *xp; | |
919 | ||
176e21ee CL |
920 | repsize = skb->len - sizeof(rpc_fraghdr); |
921 | if (repsize < 4) { | |
922 | dprintk("RPC: impossible RPC reply size %d\n", repsize); | |
a2648094 | 923 | return; |
176e21ee CL |
924 | } |
925 | ||
926 | /* Copy the XID from the skb... */ | |
927 | xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); | |
928 | if (xp == NULL) | |
a2648094 | 929 | return; |
176e21ee CL |
930 | |
931 | /* Look up and lock the request corresponding to the given XID */ | |
a2648094 | 932 | spin_lock_bh(&xprt->transport_lock); |
176e21ee CL |
933 | rovr = xprt_lookup_rqst(xprt, *xp); |
934 | if (!rovr) | |
935 | goto out_unlock; | |
936 | task = rovr->rq_task; | |
937 | ||
938 | copied = rovr->rq_private_buf.buflen; | |
939 | if (copied > repsize) | |
940 | copied = repsize; | |
941 | ||
942 | if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { | |
943 | dprintk("RPC: sk_buff copy failed\n"); | |
944 | goto out_unlock; | |
945 | } | |
946 | ||
947 | xprt_complete_rqst(task, copied); | |
948 | ||
949 | out_unlock: | |
a2648094 TM |
950 | spin_unlock_bh(&xprt->transport_lock); |
951 | } | |
952 | ||
953 | static void xs_local_data_receive(struct sock_xprt *transport) | |
954 | { | |
955 | struct sk_buff *skb; | |
956 | struct sock *sk; | |
957 | int err; | |
958 | ||
959 | mutex_lock(&transport->recv_mutex); | |
960 | sk = transport->inet; | |
961 | if (sk == NULL) | |
962 | goto out; | |
963 | for (;;) { | |
964 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
965 | if (skb == NULL) | |
966 | break; | |
967 | xs_local_data_read_skb(&transport->xprt, sk, skb); | |
968 | skb_free_datagram(sk, skb); | |
969 | } | |
970 | out: | |
971 | mutex_unlock(&transport->recv_mutex); | |
972 | } | |
973 | ||
974 | static void xs_local_data_receive_workfn(struct work_struct *work) | |
975 | { | |
976 | struct sock_xprt *transport = | |
977 | container_of(work, struct sock_xprt, recv_worker); | |
978 | xs_local_data_receive(transport); | |
176e21ee CL |
979 | } |
980 | ||
9903cd1c | 981 | /** |
f9b2ee71 TM |
982 | * xs_udp_data_read_skb - receive callback for UDP sockets |
983 | * @xprt: transport | |
984 | * @sk: socket | |
985 | * @skb: skbuff | |
9903cd1c | 986 | * |
a246b010 | 987 | */ |
f9b2ee71 TM |
988 | static void xs_udp_data_read_skb(struct rpc_xprt *xprt, |
989 | struct sock *sk, | |
990 | struct sk_buff *skb) | |
a246b010 | 991 | { |
9903cd1c | 992 | struct rpc_task *task; |
a246b010 | 993 | struct rpc_rqst *rovr; |
f9b2ee71 | 994 | int repsize, copied; |
d8ed029d AD |
995 | u32 _xid; |
996 | __be32 *xp; | |
a246b010 | 997 | |
1da8c681 | 998 | repsize = skb->len; |
a246b010 | 999 | if (repsize < 4) { |
46121cf7 | 1000 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
f9b2ee71 | 1001 | return; |
a246b010 CL |
1002 | } |
1003 | ||
1004 | /* Copy the XID from the skb... */ | |
1da8c681 | 1005 | xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); |
a246b010 | 1006 | if (xp == NULL) |
f9b2ee71 | 1007 | return; |
a246b010 CL |
1008 | |
1009 | /* Look up and lock the request corresponding to the given XID */ | |
f9b2ee71 | 1010 | spin_lock_bh(&xprt->transport_lock); |
a246b010 CL |
1011 | rovr = xprt_lookup_rqst(xprt, *xp); |
1012 | if (!rovr) | |
1013 | goto out_unlock; | |
1014 | task = rovr->rq_task; | |
1015 | ||
a246b010 CL |
1016 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
1017 | copied = repsize; | |
1018 | ||
1019 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
1781f7f5 | 1020 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
02c22347 | 1021 | __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); |
a246b010 | 1022 | goto out_unlock; |
1781f7f5 HX |
1023 | } |
1024 | ||
02c22347 | 1025 | __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); |
a246b010 | 1026 | |
6a24dfb6 | 1027 | xprt_adjust_cwnd(xprt, task, copied); |
1570c1e4 | 1028 | xprt_complete_rqst(task, copied); |
a246b010 CL |
1029 | |
1030 | out_unlock: | |
f9b2ee71 TM |
1031 | spin_unlock_bh(&xprt->transport_lock); |
1032 | } | |
1033 | ||
1034 | static void xs_udp_data_receive(struct sock_xprt *transport) | |
1035 | { | |
1036 | struct sk_buff *skb; | |
1037 | struct sock *sk; | |
1038 | int err; | |
1039 | ||
1040 | mutex_lock(&transport->recv_mutex); | |
1041 | sk = transport->inet; | |
1042 | if (sk == NULL) | |
1043 | goto out; | |
1044 | for (;;) { | |
1045 | skb = skb_recv_datagram(sk, 0, 1, &err); | |
1046 | if (skb == NULL) | |
1047 | break; | |
1048 | xs_udp_data_read_skb(&transport->xprt, sk, skb); | |
1049 | skb_free_datagram(sk, skb); | |
1050 | } | |
1051 | out: | |
1052 | mutex_unlock(&transport->recv_mutex); | |
1053 | } | |
1054 | ||
1055 | static void xs_udp_data_receive_workfn(struct work_struct *work) | |
1056 | { | |
1057 | struct sock_xprt *transport = | |
1058 | container_of(work, struct sock_xprt, recv_worker); | |
1059 | xs_udp_data_receive(transport); | |
1060 | } | |
1061 | ||
1062 | /** | |
1063 | * xs_data_ready - "data ready" callback for UDP sockets | |
1064 | * @sk: socket with data to read | |
1065 | * | |
1066 | */ | |
1067 | static void xs_data_ready(struct sock *sk) | |
1068 | { | |
1069 | struct rpc_xprt *xprt; | |
1070 | ||
1071 | read_lock_bh(&sk->sk_callback_lock); | |
1072 | dprintk("RPC: xs_data_ready...\n"); | |
1073 | xprt = xprt_from_sock(sk); | |
1074 | if (xprt != NULL) { | |
1075 | struct sock_xprt *transport = container_of(xprt, | |
1076 | struct sock_xprt, xprt); | |
1077 | queue_work(rpciod_workqueue, &transport->recv_worker); | |
1078 | } | |
f064af1e | 1079 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1080 | } |
1081 | ||
a519fc7a TM |
1082 | /* |
1083 | * Helper function to force a TCP close if the server is sending | |
1084 | * junk and/or it has put us in CLOSE_WAIT | |
1085 | */ | |
1086 | static void xs_tcp_force_close(struct rpc_xprt *xprt) | |
1087 | { | |
a519fc7a TM |
1088 | xprt_force_disconnect(xprt); |
1089 | } | |
1090 | ||
dd456471 | 1091 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 1092 | { |
51971139 | 1093 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
1094 | size_t len, used; |
1095 | char *p; | |
1096 | ||
51971139 CL |
1097 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
1098 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 1099 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1100 | transport->tcp_offset += used; |
a246b010 CL |
1101 | if (used != len) |
1102 | return; | |
808012fb | 1103 | |
51971139 CL |
1104 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
1105 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 1106 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 1107 | else |
e136d092 | 1108 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 1109 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 1110 | |
e136d092 | 1111 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 1112 | transport->tcp_offset = 0; |
808012fb | 1113 | |
a246b010 | 1114 | /* Sanity check of the record length */ |
18dca02a | 1115 | if (unlikely(transport->tcp_reclen < 8)) { |
46121cf7 | 1116 | dprintk("RPC: invalid TCP record fragment length\n"); |
a519fc7a | 1117 | xs_tcp_force_close(xprt); |
9903cd1c | 1118 | return; |
a246b010 | 1119 | } |
46121cf7 | 1120 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 1121 | transport->tcp_reclen); |
a246b010 CL |
1122 | } |
1123 | ||
51971139 | 1124 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 1125 | { |
51971139 | 1126 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 1127 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 1128 | transport->tcp_offset = 0; |
e136d092 CL |
1129 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
1130 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1131 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 1132 | transport->tcp_copied = 0; |
a246b010 CL |
1133 | } |
1134 | } | |
1135 | } | |
1136 | ||
dd456471 | 1137 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1138 | { |
1139 | size_t len, used; | |
1140 | char *p; | |
1141 | ||
51971139 | 1142 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 1143 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 1144 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 1145 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 1146 | transport->tcp_offset += used; |
a246b010 CL |
1147 | if (used != len) |
1148 | return; | |
e136d092 | 1149 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
f4a2e418 | 1150 | transport->tcp_flags |= TCP_RCV_READ_CALLDIR; |
51971139 | 1151 | transport->tcp_copied = 4; |
18dca02a RL |
1152 | dprintk("RPC: reading %s XID %08x\n", |
1153 | (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" | |
1154 | : "request with", | |
51971139 CL |
1155 | ntohl(transport->tcp_xid)); |
1156 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
1157 | } |
1158 | ||
18dca02a RL |
1159 | static inline void xs_tcp_read_calldir(struct sock_xprt *transport, |
1160 | struct xdr_skb_reader *desc) | |
a246b010 | 1161 | { |
18dca02a RL |
1162 | size_t len, used; |
1163 | u32 offset; | |
b76ce561 | 1164 | char *p; |
18dca02a RL |
1165 | |
1166 | /* | |
1167 | * We want transport->tcp_offset to be 8 at the end of this routine | |
1168 | * (4 bytes for the xid and 4 bytes for the call/reply flag). | |
1169 | * When this function is called for the first time, | |
1170 | * transport->tcp_offset is 4 (after having already read the xid). | |
1171 | */ | |
1172 | offset = transport->tcp_offset - sizeof(transport->tcp_xid); | |
b76ce561 | 1173 | len = sizeof(transport->tcp_calldir) - offset; |
18dca02a | 1174 | dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); |
b76ce561 TM |
1175 | p = ((char *) &transport->tcp_calldir) + offset; |
1176 | used = xdr_skb_read_bits(desc, p, len); | |
18dca02a RL |
1177 | transport->tcp_offset += used; |
1178 | if (used != len) | |
1179 | return; | |
f4a2e418 | 1180 | transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; |
f4a2e418 RL |
1181 | /* |
1182 | * We don't yet have the XDR buffer, so we will write the calldir | |
1183 | * out after we get the buffer from the 'struct rpc_rqst' | |
1184 | */ | |
b76ce561 TM |
1185 | switch (ntohl(transport->tcp_calldir)) { |
1186 | case RPC_REPLY: | |
1187 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1188 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1189 | transport->tcp_flags |= TCP_RPC_REPLY; |
b76ce561 TM |
1190 | break; |
1191 | case RPC_CALL: | |
1192 | transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; | |
1193 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
18dca02a | 1194 | transport->tcp_flags &= ~TCP_RPC_REPLY; |
b76ce561 TM |
1195 | break; |
1196 | default: | |
1197 | dprintk("RPC: invalid request message type\n"); | |
a519fc7a | 1198 | xs_tcp_force_close(&transport->xprt); |
b76ce561 | 1199 | } |
18dca02a RL |
1200 | xs_tcp_check_fraghdr(transport); |
1201 | } | |
1202 | ||
44b98efd RL |
1203 | static inline void xs_tcp_read_common(struct rpc_xprt *xprt, |
1204 | struct xdr_skb_reader *desc, | |
1205 | struct rpc_rqst *req) | |
a246b010 | 1206 | { |
44b98efd RL |
1207 | struct sock_xprt *transport = |
1208 | container_of(xprt, struct sock_xprt, xprt); | |
a246b010 CL |
1209 | struct xdr_buf *rcvbuf; |
1210 | size_t len; | |
1211 | ssize_t r; | |
1212 | ||
a246b010 | 1213 | rcvbuf = &req->rq_private_buf; |
f4a2e418 RL |
1214 | |
1215 | if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { | |
1216 | /* | |
1217 | * Save the RPC direction in the XDR buffer | |
1218 | */ | |
f4a2e418 | 1219 | memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, |
b76ce561 TM |
1220 | &transport->tcp_calldir, |
1221 | sizeof(transport->tcp_calldir)); | |
1222 | transport->tcp_copied += sizeof(transport->tcp_calldir); | |
f4a2e418 | 1223 | transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; |
a246b010 CL |
1224 | } |
1225 | ||
a246b010 | 1226 | len = desc->count; |
51971139 | 1227 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 1228 | struct xdr_skb_reader my_desc; |
a246b010 | 1229 | |
51971139 | 1230 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1231 | memcpy(&my_desc, desc, sizeof(my_desc)); |
1232 | my_desc.count = len; | |
51971139 | 1233 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1234 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
1235 | desc->count -= r; |
1236 | desc->offset += r; | |
1237 | } else | |
51971139 | 1238 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 1239 | desc, xdr_skb_read_bits); |
a246b010 CL |
1240 | |
1241 | if (r > 0) { | |
51971139 CL |
1242 | transport->tcp_copied += r; |
1243 | transport->tcp_offset += r; | |
a246b010 CL |
1244 | } |
1245 | if (r != len) { | |
1246 | /* Error when copying to the receive buffer, | |
1247 | * usually because we weren't able to allocate | |
1248 | * additional buffer pages. All we can do now | |
e136d092 | 1249 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
1250 | * will not receive any additional updates, |
1251 | * and time out. | |
1252 | * Any remaining data from this record will | |
1253 | * be discarded. | |
1254 | */ | |
e136d092 | 1255 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 1256 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 1257 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
1258 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
1259 | "tcp_offset = %u, tcp_reclen = %u\n", | |
1260 | xprt, transport->tcp_copied, | |
1261 | transport->tcp_offset, transport->tcp_reclen); | |
44b98efd | 1262 | return; |
a246b010 CL |
1263 | } |
1264 | ||
46121cf7 | 1265 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 1266 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
1267 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
1268 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
1269 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
1270 | |
1271 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 1272 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 1273 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
1274 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
1275 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 | 1276 | } |
44b98efd RL |
1277 | } |
1278 | ||
1279 | /* | |
1280 | * Finds the request corresponding to the RPC xid and invokes the common | |
1281 | * tcp read code to read the data. | |
1282 | */ | |
1283 | static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, | |
1284 | struct xdr_skb_reader *desc) | |
1285 | { | |
1286 | struct sock_xprt *transport = | |
1287 | container_of(xprt, struct sock_xprt, xprt); | |
1288 | struct rpc_rqst *req; | |
1289 | ||
1290 | dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); | |
1291 | ||
1292 | /* Find and lock the request corresponding to this xid */ | |
edc1b01c | 1293 | spin_lock_bh(&xprt->transport_lock); |
44b98efd RL |
1294 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
1295 | if (!req) { | |
1296 | dprintk("RPC: XID %08x request not found!\n", | |
1297 | ntohl(transport->tcp_xid)); | |
edc1b01c | 1298 | spin_unlock_bh(&xprt->transport_lock); |
44b98efd RL |
1299 | return -1; |
1300 | } | |
1301 | ||
1302 | xs_tcp_read_common(xprt, desc, req); | |
1303 | ||
e136d092 | 1304 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 1305 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
44b98efd | 1306 | |
edc1b01c | 1307 | spin_unlock_bh(&xprt->transport_lock); |
44b98efd RL |
1308 | return 0; |
1309 | } | |
1310 | ||
9e00abc3 | 1311 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
44b98efd RL |
1312 | /* |
1313 | * Obtains an rpc_rqst previously allocated and invokes the common | |
1314 | * tcp read code to read the data. The result is placed in the callback | |
1315 | * queue. | |
1316 | * If we're unable to obtain the rpc_rqst we schedule the closing of the | |
1317 | * connection and return -1. | |
1318 | */ | |
2ea24497 | 1319 | static int xs_tcp_read_callback(struct rpc_xprt *xprt, |
44b98efd RL |
1320 | struct xdr_skb_reader *desc) |
1321 | { | |
1322 | struct sock_xprt *transport = | |
1323 | container_of(xprt, struct sock_xprt, xprt); | |
1324 | struct rpc_rqst *req; | |
1325 | ||
2ea24497 | 1326 | /* Look up and lock the request corresponding to the given XID */ |
edc1b01c | 1327 | spin_lock_bh(&xprt->transport_lock); |
2ea24497 | 1328 | req = xprt_lookup_bc_request(xprt, transport->tcp_xid); |
44b98efd | 1329 | if (req == NULL) { |
edc1b01c | 1330 | spin_unlock_bh(&xprt->transport_lock); |
44b98efd RL |
1331 | printk(KERN_WARNING "Callback slot table overflowed\n"); |
1332 | xprt_force_disconnect(xprt); | |
1333 | return -1; | |
1334 | } | |
1335 | ||
44b98efd RL |
1336 | dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); |
1337 | xs_tcp_read_common(xprt, desc, req); | |
1338 | ||
2ea24497 TM |
1339 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
1340 | xprt_complete_bc_request(req, transport->tcp_copied); | |
edc1b01c | 1341 | spin_unlock_bh(&xprt->transport_lock); |
44b98efd RL |
1342 | |
1343 | return 0; | |
1344 | } | |
1345 | ||
1346 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1347 | struct xdr_skb_reader *desc) | |
1348 | { | |
1349 | struct sock_xprt *transport = | |
1350 | container_of(xprt, struct sock_xprt, xprt); | |
1351 | ||
1352 | return (transport->tcp_flags & TCP_RPC_REPLY) ? | |
1353 | xs_tcp_read_reply(xprt, desc) : | |
1354 | xs_tcp_read_callback(xprt, desc); | |
1355 | } | |
76566773 CL |
1356 | |
1357 | static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net) | |
1358 | { | |
1359 | int ret; | |
1360 | ||
1361 | ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0, | |
1362 | SVC_SOCK_ANONYMOUS); | |
1363 | if (ret < 0) | |
1364 | return ret; | |
1365 | return 0; | |
1366 | } | |
6b26cc8c CL |
1367 | |
1368 | static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) | |
1369 | { | |
1370 | return PAGE_SIZE; | |
1371 | } | |
44b98efd RL |
1372 | #else |
1373 | static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, | |
1374 | struct xdr_skb_reader *desc) | |
1375 | { | |
1376 | return xs_tcp_read_reply(xprt, desc); | |
1377 | } | |
9e00abc3 | 1378 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
44b98efd RL |
1379 | |
1380 | /* | |
1381 | * Read data off the transport. This can be either an RPC_CALL or an | |
1382 | * RPC_REPLY. Relay the processing to helper functions. | |
1383 | */ | |
1384 | static void xs_tcp_read_data(struct rpc_xprt *xprt, | |
1385 | struct xdr_skb_reader *desc) | |
1386 | { | |
1387 | struct sock_xprt *transport = | |
1388 | container_of(xprt, struct sock_xprt, xprt); | |
1389 | ||
1390 | if (_xs_tcp_read_data(xprt, desc) == 0) | |
1391 | xs_tcp_check_fraghdr(transport); | |
1392 | else { | |
1393 | /* | |
1394 | * The transport_lock protects the request handling. | |
1395 | * There's no need to hold it to update the tcp_flags. | |
1396 | */ | |
1397 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
1398 | } | |
a246b010 CL |
1399 | } |
1400 | ||
dd456471 | 1401 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
1402 | { |
1403 | size_t len; | |
1404 | ||
51971139 | 1405 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
1406 | if (len > desc->count) |
1407 | len = desc->count; | |
1408 | desc->count -= len; | |
1409 | desc->offset += len; | |
51971139 | 1410 | transport->tcp_offset += len; |
46121cf7 | 1411 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 1412 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
1413 | } |
1414 | ||
9903cd1c | 1415 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
1416 | { |
1417 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 1418 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 1419 | struct xdr_skb_reader desc = { |
a246b010 CL |
1420 | .skb = skb, |
1421 | .offset = offset, | |
1422 | .count = len, | |
9903cd1c | 1423 | }; |
a246b010 | 1424 | |
46121cf7 | 1425 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 | 1426 | do { |
1a867a08 | 1427 | trace_xs_tcp_data_recv(transport); |
a246b010 CL |
1428 | /* Read in a new fragment marker if necessary */ |
1429 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1430 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1431 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1432 | continue; |
1433 | } | |
1434 | /* Read in the xid if necessary */ | |
e136d092 | 1435 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1436 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1437 | continue; |
1438 | } | |
18dca02a | 1439 | /* Read in the call/reply flag */ |
f4a2e418 | 1440 | if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { |
18dca02a RL |
1441 | xs_tcp_read_calldir(transport, &desc); |
1442 | continue; | |
1443 | } | |
a246b010 | 1444 | /* Read in the request data */ |
e136d092 | 1445 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
44b98efd | 1446 | xs_tcp_read_data(xprt, &desc); |
a246b010 CL |
1447 | continue; |
1448 | } | |
1449 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1450 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1451 | } while (desc.count); |
1a867a08 | 1452 | trace_xs_tcp_data_recv(transport); |
46121cf7 | 1453 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1454 | return len - desc.count; |
1455 | } | |
1456 | ||
66d7a56a TM |
1457 | static void xs_tcp_data_receive(struct sock_xprt *transport) |
1458 | { | |
1459 | struct rpc_xprt *xprt = &transport->xprt; | |
1460 | struct sock *sk; | |
1461 | read_descriptor_t rd_desc = { | |
1462 | .count = 2*1024*1024, | |
1463 | .arg.data = xprt, | |
1464 | }; | |
1465 | unsigned long total = 0; | |
1466 | int read = 0; | |
1467 | ||
edc1b01c | 1468 | mutex_lock(&transport->recv_mutex); |
66d7a56a | 1469 | sk = transport->inet; |
edc1b01c TM |
1470 | if (sk == NULL) |
1471 | goto out; | |
66d7a56a TM |
1472 | |
1473 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ | |
1474 | for (;;) { | |
edc1b01c | 1475 | lock_sock(sk); |
66d7a56a | 1476 | read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
edc1b01c | 1477 | release_sock(sk); |
66d7a56a TM |
1478 | if (read <= 0) |
1479 | break; | |
1480 | total += read; | |
1481 | rd_desc.count = 65536; | |
1482 | } | |
edc1b01c TM |
1483 | out: |
1484 | mutex_unlock(&transport->recv_mutex); | |
66d7a56a TM |
1485 | trace_xs_tcp_data_ready(xprt, read, total); |
1486 | } | |
1487 | ||
edc1b01c TM |
1488 | static void xs_tcp_data_receive_workfn(struct work_struct *work) |
1489 | { | |
1490 | struct sock_xprt *transport = | |
1491 | container_of(work, struct sock_xprt, recv_worker); | |
1492 | xs_tcp_data_receive(transport); | |
1493 | } | |
1494 | ||
9903cd1c CL |
1495 | /** |
1496 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1497 | * @sk: socket with data to read | |
9903cd1c CL |
1498 | * |
1499 | */ | |
676d2369 | 1500 | static void xs_tcp_data_ready(struct sock *sk) |
a246b010 | 1501 | { |
66d7a56a | 1502 | struct sock_xprt *transport; |
a246b010 | 1503 | struct rpc_xprt *xprt; |
a246b010 | 1504 | |
46121cf7 CL |
1505 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1506 | ||
f064af1e | 1507 | read_lock_bh(&sk->sk_callback_lock); |
66d7a56a | 1508 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1509 | goto out; |
66d7a56a TM |
1510 | transport = container_of(xprt, struct sock_xprt, xprt); |
1511 | ||
61d0a8e6 NB |
1512 | /* Any data means we had a useful conversation, so |
1513 | * the we don't need to delay the next reconnect | |
1514 | */ | |
1515 | if (xprt->reestablish_timeout) | |
1516 | xprt->reestablish_timeout = 0; | |
edc1b01c | 1517 | queue_work(rpciod_workqueue, &transport->recv_worker); |
61d0a8e6 | 1518 | |
a246b010 | 1519 | out: |
f064af1e | 1520 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1521 | } |
1522 | ||
9903cd1c CL |
1523 | /** |
1524 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1525 | * @sk: socket whose state has changed | |
1526 | * | |
1527 | */ | |
1528 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1529 | { |
9903cd1c | 1530 | struct rpc_xprt *xprt; |
0fdea1e8 | 1531 | struct sock_xprt *transport; |
a246b010 | 1532 | |
f064af1e | 1533 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1534 | if (!(xprt = xprt_from_sock(sk))) |
1535 | goto out; | |
46121cf7 | 1536 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
669502ff | 1537 | dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
46121cf7 CL |
1538 | sk->sk_state, xprt_connected(xprt), |
1539 | sock_flag(sk, SOCK_DEAD), | |
669502ff AC |
1540 | sock_flag(sk, SOCK_ZAPPED), |
1541 | sk->sk_shutdown); | |
a246b010 | 1542 | |
0fdea1e8 | 1543 | transport = container_of(xprt, struct sock_xprt, xprt); |
40b5ea0c | 1544 | trace_rpc_socket_state_change(xprt, sk->sk_socket); |
a246b010 CL |
1545 | switch (sk->sk_state) { |
1546 | case TCP_ESTABLISHED: | |
f064af1e | 1547 | spin_lock(&xprt->transport_lock); |
a246b010 | 1548 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 | 1549 | |
a246b010 | 1550 | /* Reset TCP record info */ |
51971139 CL |
1551 | transport->tcp_offset = 0; |
1552 | transport->tcp_reclen = 0; | |
1553 | transport->tcp_copied = 0; | |
e136d092 CL |
1554 | transport->tcp_flags = |
1555 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
8b71798c | 1556 | xprt->connect_cookie++; |
0fdea1e8 TM |
1557 | clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); |
1558 | xprt_clear_connecting(xprt); | |
51971139 | 1559 | |
2a491991 | 1560 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
a246b010 | 1561 | } |
f064af1e | 1562 | spin_unlock(&xprt->transport_lock); |
a246b010 | 1563 | break; |
3b948ae5 TM |
1564 | case TCP_FIN_WAIT1: |
1565 | /* The client initiated a shutdown of the socket */ | |
7c1d71cf | 1566 | xprt->connect_cookie++; |
663b8858 | 1567 | xprt->reestablish_timeout = 0; |
3b948ae5 | 1568 | set_bit(XPRT_CLOSING, &xprt->state); |
4e857c58 | 1569 | smp_mb__before_atomic(); |
3b948ae5 | 1570 | clear_bit(XPRT_CONNECTED, &xprt->state); |
ef803670 | 1571 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
4e857c58 | 1572 | smp_mb__after_atomic(); |
a246b010 | 1573 | break; |
632e3bdc | 1574 | case TCP_CLOSE_WAIT: |
3b948ae5 | 1575 | /* The server initiated a shutdown of the socket */ |
7c1d71cf | 1576 | xprt->connect_cookie++; |
d0bea455 | 1577 | clear_bit(XPRT_CONNECTED, &xprt->state); |
a519fc7a | 1578 | xs_tcp_force_close(xprt); |
663b8858 TM |
1579 | case TCP_CLOSING: |
1580 | /* | |
1581 | * If the server closed down the connection, make sure that | |
1582 | * we back off before reconnecting | |
1583 | */ | |
1584 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) | |
1585 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
3b948ae5 TM |
1586 | break; |
1587 | case TCP_LAST_ACK: | |
670f9457 | 1588 | set_bit(XPRT_CLOSING, &xprt->state); |
4e857c58 | 1589 | smp_mb__before_atomic(); |
3b948ae5 | 1590 | clear_bit(XPRT_CONNECTED, &xprt->state); |
4e857c58 | 1591 | smp_mb__after_atomic(); |
3b948ae5 TM |
1592 | break; |
1593 | case TCP_CLOSE: | |
0fdea1e8 TM |
1594 | if (test_and_clear_bit(XPRT_SOCK_CONNECTING, |
1595 | &transport->sock_state)) | |
1596 | xprt_clear_connecting(xprt); | |
7d1e8255 | 1597 | xs_sock_mark_closed(xprt); |
a246b010 CL |
1598 | } |
1599 | out: | |
f064af1e | 1600 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1601 | } |
1602 | ||
1f0fa154 IJ |
1603 | static void xs_write_space(struct sock *sk) |
1604 | { | |
13331a55 | 1605 | struct socket_wq *wq; |
1f0fa154 IJ |
1606 | struct rpc_xprt *xprt; |
1607 | ||
13331a55 | 1608 | if (!sk->sk_socket) |
1f0fa154 | 1609 | return; |
13331a55 | 1610 | clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
1f0fa154 IJ |
1611 | |
1612 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1613 | return; | |
13331a55 TM |
1614 | rcu_read_lock(); |
1615 | wq = rcu_dereference(sk->sk_wq); | |
1616 | if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) | |
1617 | goto out; | |
1f0fa154 IJ |
1618 | |
1619 | xprt_write_space(xprt); | |
13331a55 TM |
1620 | out: |
1621 | rcu_read_unlock(); | |
1f0fa154 IJ |
1622 | } |
1623 | ||
9903cd1c | 1624 | /** |
c7b2cae8 CL |
1625 | * xs_udp_write_space - callback invoked when socket buffer space |
1626 | * becomes available | |
9903cd1c CL |
1627 | * @sk: socket whose state has changed |
1628 | * | |
a246b010 CL |
1629 | * Called when more output buffer space is available for this socket. |
1630 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1631 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1632 | * with a bunch of small requests. |
1633 | */ | |
c7b2cae8 | 1634 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1635 | { |
f064af1e | 1636 | read_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1637 | |
c7b2cae8 | 1638 | /* from net/core/sock.c:sock_def_write_space */ |
1f0fa154 IJ |
1639 | if (sock_writeable(sk)) |
1640 | xs_write_space(sk); | |
a246b010 | 1641 | |
f064af1e | 1642 | read_unlock_bh(&sk->sk_callback_lock); |
c7b2cae8 | 1643 | } |
a246b010 | 1644 | |
c7b2cae8 CL |
1645 | /** |
1646 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1647 | * becomes available | |
1648 | * @sk: socket whose state has changed | |
1649 | * | |
1650 | * Called when more output buffer space is available for this socket. | |
1651 | * We try not to wake our writers until they can make "significant" | |
1652 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1653 | * with a bunch of small requests. | |
1654 | */ | |
1655 | static void xs_tcp_write_space(struct sock *sk) | |
1656 | { | |
f064af1e | 1657 | read_lock_bh(&sk->sk_callback_lock); |
c7b2cae8 CL |
1658 | |
1659 | /* from net/core/stream.c:sk_stream_write_space */ | |
64dc6130 | 1660 | if (sk_stream_is_writeable(sk)) |
1f0fa154 | 1661 | xs_write_space(sk); |
b6ddf64f | 1662 | |
f064af1e | 1663 | read_unlock_bh(&sk->sk_callback_lock); |
a246b010 CL |
1664 | } |
1665 | ||
470056c2 | 1666 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1667 | { |
ee0ac0c2 CL |
1668 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1669 | struct sock *sk = transport->inet; | |
a246b010 | 1670 | |
7c6e066e | 1671 | if (transport->rcvsize) { |
a246b010 | 1672 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1673 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1674 | } |
7c6e066e | 1675 | if (transport->sndsize) { |
a246b010 | 1676 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1677 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1678 | sk->sk_write_space(sk); |
1679 | } | |
1680 | } | |
1681 | ||
43118c29 | 1682 | /** |
470056c2 | 1683 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1684 | * @xprt: generic transport |
470056c2 CL |
1685 | * @sndsize: requested size of send buffer, in bytes |
1686 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1687 | * |
470056c2 | 1688 | * Set socket send and receive buffer size limits. |
43118c29 | 1689 | */ |
470056c2 | 1690 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1691 | { |
7c6e066e CL |
1692 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1693 | ||
1694 | transport->sndsize = 0; | |
470056c2 | 1695 | if (sndsize) |
7c6e066e CL |
1696 | transport->sndsize = sndsize + 1024; |
1697 | transport->rcvsize = 0; | |
470056c2 | 1698 | if (rcvsize) |
7c6e066e | 1699 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1700 | |
1701 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1702 | } |
1703 | ||
46c0ee8b CL |
1704 | /** |
1705 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1706 | * @task: task that timed out | |
1707 | * | |
1708 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1709 | */ | |
6a24dfb6 | 1710 | static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) |
46c0ee8b | 1711 | { |
6a24dfb6 | 1712 | xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); |
46c0ee8b CL |
1713 | } |
1714 | ||
b85d8806 CL |
1715 | static unsigned short xs_get_random_port(void) |
1716 | { | |
1717 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
63862b5b | 1718 | unsigned short rand = (unsigned short) prandom_u32() % range; |
b85d8806 CL |
1719 | return rand + xprt_min_resvport; |
1720 | } | |
1721 | ||
4dda9c8a TM |
1722 | /** |
1723 | * xs_set_reuseaddr_port - set the socket's port and address reuse options | |
1724 | * @sock: socket | |
1725 | * | |
1726 | * Note that this function has to be called on all sockets that share the | |
1727 | * same port, and it must be called before binding. | |
1728 | */ | |
1729 | static void xs_sock_set_reuseport(struct socket *sock) | |
1730 | { | |
402e23b4 | 1731 | int opt = 1; |
4dda9c8a | 1732 | |
402e23b4 TM |
1733 | kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, |
1734 | (char *)&opt, sizeof(opt)); | |
4dda9c8a TM |
1735 | } |
1736 | ||
1737 | static unsigned short xs_sock_getport(struct socket *sock) | |
1738 | { | |
1739 | struct sockaddr_storage buf; | |
1740 | int buflen; | |
1741 | unsigned short port = 0; | |
1742 | ||
1743 | if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0) | |
1744 | goto out; | |
1745 | switch (buf.ss_family) { | |
1746 | case AF_INET6: | |
1747 | port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); | |
1748 | break; | |
1749 | case AF_INET: | |
1750 | port = ntohs(((struct sockaddr_in *)&buf)->sin_port); | |
1751 | } | |
1752 | out: | |
1753 | return port; | |
1754 | } | |
1755 | ||
92200412 CL |
1756 | /** |
1757 | * xs_set_port - reset the port number in the remote endpoint address | |
1758 | * @xprt: generic transport | |
1759 | * @port: new port number | |
1760 | * | |
1761 | */ | |
1762 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1763 | { | |
46121cf7 | 1764 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1765 | |
9dc3b095 CL |
1766 | rpc_set_port(xs_addr(xprt), port); |
1767 | xs_update_peer_port(xprt); | |
92200412 CL |
1768 | } |
1769 | ||
4dda9c8a TM |
1770 | static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) |
1771 | { | |
1772 | if (transport->srcport == 0) | |
1773 | transport->srcport = xs_sock_getport(sock); | |
1774 | } | |
1775 | ||
5d4ec932 | 1776 | static unsigned short xs_get_srcport(struct sock_xprt *transport) |
67a391d7 | 1777 | { |
fbfffbd5 | 1778 | unsigned short port = transport->srcport; |
67a391d7 TM |
1779 | |
1780 | if (port == 0 && transport->xprt.resvport) | |
1781 | port = xs_get_random_port(); | |
1782 | return port; | |
1783 | } | |
1784 | ||
baaf4e48 | 1785 | static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
67a391d7 | 1786 | { |
fbfffbd5 CL |
1787 | if (transport->srcport != 0) |
1788 | transport->srcport = 0; | |
67a391d7 TM |
1789 | if (!transport->xprt.resvport) |
1790 | return 0; | |
1791 | if (port <= xprt_min_resvport || port > xprt_max_resvport) | |
1792 | return xprt_max_resvport; | |
1793 | return --port; | |
1794 | } | |
beb59b68 | 1795 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
a246b010 | 1796 | { |
beb59b68 | 1797 | struct sockaddr_storage myaddr; |
67a391d7 | 1798 | int err, nloop = 0; |
5d4ec932 | 1799 | unsigned short port = xs_get_srcport(transport); |
67a391d7 | 1800 | unsigned short last; |
a246b010 | 1801 | |
0f7a622c CP |
1802 | /* |
1803 | * If we are asking for any ephemeral port (i.e. port == 0 && | |
1804 | * transport->xprt.resvport == 0), don't bind. Let the local | |
1805 | * port selection happen implicitly when the socket is used | |
1806 | * (for example at connect time). | |
1807 | * | |
1808 | * This ensures that we can continue to establish TCP | |
1809 | * connections even when all local ephemeral ports are already | |
1810 | * a part of some TCP connection. This makes no difference | |
1811 | * for UDP sockets, but also doens't harm them. | |
1812 | * | |
1813 | * If we're asking for any reserved port (i.e. port == 0 && | |
1814 | * transport->xprt.resvport == 1) xs_get_srcport above will | |
1815 | * ensure that port is non-zero and we will bind as needed. | |
1816 | */ | |
1817 | if (port == 0) | |
1818 | return 0; | |
1819 | ||
beb59b68 | 1820 | memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
a246b010 | 1821 | do { |
beb59b68 PE |
1822 | rpc_set_port((struct sockaddr *)&myaddr, port); |
1823 | err = kernel_bind(sock, (struct sockaddr *)&myaddr, | |
1824 | transport->xprt.addrlen); | |
a246b010 | 1825 | if (err == 0) { |
fbfffbd5 | 1826 | transport->srcport = port; |
d3bc9a1d | 1827 | break; |
a246b010 | 1828 | } |
67a391d7 | 1829 | last = port; |
baaf4e48 | 1830 | port = xs_next_srcport(transport, port); |
67a391d7 TM |
1831 | if (port > last) |
1832 | nloop++; | |
1833 | } while (err == -EADDRINUSE && nloop != 2); | |
90058d37 | 1834 | |
4232e863 | 1835 | if (myaddr.ss_family == AF_INET) |
beb59b68 PE |
1836 | dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
1837 | &((struct sockaddr_in *)&myaddr)->sin_addr, | |
1838 | port, err ? "failed" : "ok", err); | |
1839 | else | |
1840 | dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, | |
1841 | &((struct sockaddr_in6 *)&myaddr)->sin6_addr, | |
1842 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1843 | return err; |
1844 | } | |
1845 | ||
176e21ee CL |
1846 | /* |
1847 | * We don't support autobind on AF_LOCAL sockets | |
1848 | */ | |
1849 | static void xs_local_rpcbind(struct rpc_task *task) | |
1850 | { | |
fb43d172 | 1851 | xprt_set_bound(task->tk_xprt); |
176e21ee CL |
1852 | } |
1853 | ||
1854 | static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1855 | { | |
1856 | } | |
beb59b68 | 1857 | |
ed07536e PZ |
1858 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1859 | static struct lock_class_key xs_key[2]; | |
1860 | static struct lock_class_key xs_slock_key[2]; | |
1861 | ||
176e21ee CL |
1862 | static inline void xs_reclassify_socketu(struct socket *sock) |
1863 | { | |
1864 | struct sock *sk = sock->sk; | |
1865 | ||
176e21ee CL |
1866 | sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", |
1867 | &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); | |
1868 | } | |
1869 | ||
8945ee5e | 1870 | static inline void xs_reclassify_socket4(struct socket *sock) |
ed07536e PZ |
1871 | { |
1872 | struct sock *sk = sock->sk; | |
8945ee5e | 1873 | |
8945ee5e CL |
1874 | sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
1875 | &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); | |
1876 | } | |
ed07536e | 1877 | |
8945ee5e CL |
1878 | static inline void xs_reclassify_socket6(struct socket *sock) |
1879 | { | |
1880 | struct sock *sk = sock->sk; | |
ed07536e | 1881 | |
8945ee5e CL |
1882 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
1883 | &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); | |
ed07536e | 1884 | } |
6bc9638a PE |
1885 | |
1886 | static inline void xs_reclassify_socket(int family, struct socket *sock) | |
1887 | { | |
fafc4e1e | 1888 | if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) |
1b7a1819 WAA |
1889 | return; |
1890 | ||
4232e863 | 1891 | switch (family) { |
176e21ee CL |
1892 | case AF_LOCAL: |
1893 | xs_reclassify_socketu(sock); | |
1894 | break; | |
4232e863 | 1895 | case AF_INET: |
6bc9638a | 1896 | xs_reclassify_socket4(sock); |
4232e863 CL |
1897 | break; |
1898 | case AF_INET6: | |
6bc9638a | 1899 | xs_reclassify_socket6(sock); |
4232e863 CL |
1900 | break; |
1901 | } | |
6bc9638a | 1902 | } |
ed07536e | 1903 | #else |
6bc9638a PE |
1904 | static inline void xs_reclassify_socket(int family, struct socket *sock) |
1905 | { | |
1906 | } | |
ed07536e PZ |
1907 | #endif |
1908 | ||
93dc41bd N |
1909 | static void xs_dummy_setup_socket(struct work_struct *work) |
1910 | { | |
1911 | } | |
1912 | ||
6bc9638a | 1913 | static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
4dda9c8a TM |
1914 | struct sock_xprt *transport, int family, int type, |
1915 | int protocol, bool reuseport) | |
22f79326 PE |
1916 | { |
1917 | struct socket *sock; | |
1918 | int err; | |
1919 | ||
6bc9638a | 1920 | err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
22f79326 PE |
1921 | if (err < 0) { |
1922 | dprintk("RPC: can't create %d transport socket (%d).\n", | |
1923 | protocol, -err); | |
1924 | goto out; | |
1925 | } | |
6bc9638a | 1926 | xs_reclassify_socket(family, sock); |
22f79326 | 1927 | |
4dda9c8a TM |
1928 | if (reuseport) |
1929 | xs_sock_set_reuseport(sock); | |
1930 | ||
4cea288a BH |
1931 | err = xs_bind(transport, sock); |
1932 | if (err) { | |
22f79326 PE |
1933 | sock_release(sock); |
1934 | goto out; | |
1935 | } | |
1936 | ||
1937 | return sock; | |
1938 | out: | |
1939 | return ERR_PTR(err); | |
1940 | } | |
1941 | ||
176e21ee CL |
1942 | static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
1943 | struct socket *sock) | |
1944 | { | |
1945 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
1946 | xprt); | |
1947 | ||
1948 | if (!transport->inet) { | |
1949 | struct sock *sk = sock->sk; | |
1950 | ||
1951 | write_lock_bh(&sk->sk_callback_lock); | |
1952 | ||
1953 | xs_save_old_callbacks(transport, sk); | |
1954 | ||
1955 | sk->sk_user_data = xprt; | |
a2648094 | 1956 | sk->sk_data_ready = xs_data_ready; |
176e21ee | 1957 | sk->sk_write_space = xs_udp_write_space; |
b4411457 | 1958 | sock_set_flag(sk, SOCK_FASYNC); |
2118071d | 1959 | sk->sk_error_report = xs_error_report; |
c2126157 | 1960 | sk->sk_allocation = GFP_NOIO; |
176e21ee CL |
1961 | |
1962 | xprt_clear_connected(xprt); | |
1963 | ||
1964 | /* Reset to new socket */ | |
1965 | transport->sock = sock; | |
1966 | transport->inet = sk; | |
1967 | ||
1968 | write_unlock_bh(&sk->sk_callback_lock); | |
1969 | } | |
1970 | ||
1971 | /* Tell the socket layer to start connecting... */ | |
1972 | xprt->stat.connect_count++; | |
1973 | xprt->stat.connect_start = jiffies; | |
1974 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); | |
1975 | } | |
1976 | ||
1977 | /** | |
1978 | * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint | |
176e21ee | 1979 | * @transport: socket transport to connect |
176e21ee | 1980 | */ |
dc107402 | 1981 | static int xs_local_setup_socket(struct sock_xprt *transport) |
176e21ee | 1982 | { |
176e21ee CL |
1983 | struct rpc_xprt *xprt = &transport->xprt; |
1984 | struct socket *sock; | |
1985 | int status = -EIO; | |
1986 | ||
176e21ee CL |
1987 | status = __sock_create(xprt->xprt_net, AF_LOCAL, |
1988 | SOCK_STREAM, 0, &sock, 1); | |
1989 | if (status < 0) { | |
1990 | dprintk("RPC: can't create AF_LOCAL " | |
1991 | "transport socket (%d).\n", -status); | |
1992 | goto out; | |
1993 | } | |
d1358917 | 1994 | xs_reclassify_socket(AF_LOCAL, sock); |
176e21ee CL |
1995 | |
1996 | dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", | |
1997 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
1998 | ||
1999 | status = xs_local_finish_connecting(xprt, sock); | |
40b5ea0c | 2000 | trace_rpc_socket_connect(xprt, sock, status); |
176e21ee CL |
2001 | switch (status) { |
2002 | case 0: | |
2003 | dprintk("RPC: xprt %p connected to %s\n", | |
2004 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2005 | xprt_set_connected(xprt); | |
3601c4a9 | 2006 | case -ENOBUFS: |
176e21ee CL |
2007 | break; |
2008 | case -ENOENT: | |
2009 | dprintk("RPC: xprt %p: socket %s does not exist\n", | |
2010 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2011 | break; | |
4a20a988 TM |
2012 | case -ECONNREFUSED: |
2013 | dprintk("RPC: xprt %p: connection refused for %s\n", | |
2014 | xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2015 | break; | |
176e21ee CL |
2016 | default: |
2017 | printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", | |
2018 | __func__, -status, | |
2019 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2020 | } | |
2021 | ||
2022 | out: | |
2023 | xprt_clear_connecting(xprt); | |
2024 | xprt_wake_pending_tasks(xprt, status); | |
dc107402 BF |
2025 | return status; |
2026 | } | |
2027 | ||
b6669737 | 2028 | static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
dc107402 | 2029 | { |
dc107402 BF |
2030 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2031 | int ret; | |
2032 | ||
2033 | if (RPC_IS_ASYNC(task)) { | |
2034 | /* | |
2035 | * We want the AF_LOCAL connect to be resolved in the | |
2036 | * filesystem namespace of the process making the rpc | |
2037 | * call. Thus we connect synchronously. | |
2038 | * | |
2039 | * If we want to support asynchronous AF_LOCAL calls, | |
2040 | * we'll need to figure out how to pass a namespace to | |
2041 | * connect. | |
2042 | */ | |
2043 | rpc_exit(task, -ENOTCONN); | |
2044 | return; | |
2045 | } | |
2046 | ret = xs_local_setup_socket(transport); | |
2047 | if (ret && !RPC_IS_SOFTCONN(task)) | |
2048 | msleep_interruptible(15000); | |
176e21ee CL |
2049 | } |
2050 | ||
3c87ef6e | 2051 | #if IS_ENABLED(CONFIG_SUNRPC_SWAP) |
d6e971d8 JL |
2052 | /* |
2053 | * Note that this should be called with XPRT_LOCKED held (or when we otherwise | |
2054 | * know that we have exclusive access to the socket), to guard against | |
2055 | * races with xs_reset_transport. | |
2056 | */ | |
a564b8f0 MG |
2057 | static void xs_set_memalloc(struct rpc_xprt *xprt) |
2058 | { | |
2059 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, | |
2060 | xprt); | |
2061 | ||
d6e971d8 JL |
2062 | /* |
2063 | * If there's no sock, then we have nothing to set. The | |
2064 | * reconnecting process will get it for us. | |
2065 | */ | |
2066 | if (!transport->inet) | |
2067 | return; | |
8e228133 | 2068 | if (atomic_read(&xprt->swapper)) |
a564b8f0 MG |
2069 | sk_set_memalloc(transport->inet); |
2070 | } | |
2071 | ||
2072 | /** | |
d67fa4d8 | 2073 | * xs_enable_swap - Tag this transport as being used for swap. |
a564b8f0 | 2074 | * @xprt: transport to tag |
a564b8f0 | 2075 | * |
8e228133 JL |
2076 | * Take a reference to this transport on behalf of the rpc_clnt, and |
2077 | * optionally mark it for swapping if it wasn't already. | |
a564b8f0 | 2078 | */ |
d67fa4d8 JL |
2079 | static int |
2080 | xs_enable_swap(struct rpc_xprt *xprt) | |
a564b8f0 | 2081 | { |
d6e971d8 | 2082 | struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); |
a564b8f0 | 2083 | |
d6e971d8 JL |
2084 | if (atomic_inc_return(&xprt->swapper) != 1) |
2085 | return 0; | |
2086 | if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) | |
2087 | return -ERESTARTSYS; | |
2088 | if (xs->inet) | |
2089 | sk_set_memalloc(xs->inet); | |
2090 | xprt_release_xprt(xprt, NULL); | |
8e228133 JL |
2091 | return 0; |
2092 | } | |
a564b8f0 | 2093 | |
8e228133 | 2094 | /** |
d67fa4d8 | 2095 | * xs_disable_swap - Untag this transport as being used for swap. |
8e228133 JL |
2096 | * @xprt: transport to tag |
2097 | * | |
2098 | * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the | |
2099 | * swapper refcount goes to 0, untag the socket as a memalloc socket. | |
2100 | */ | |
d67fa4d8 JL |
2101 | static void |
2102 | xs_disable_swap(struct rpc_xprt *xprt) | |
8e228133 | 2103 | { |
d6e971d8 | 2104 | struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); |
8e228133 | 2105 | |
d6e971d8 JL |
2106 | if (!atomic_dec_and_test(&xprt->swapper)) |
2107 | return; | |
2108 | if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) | |
2109 | return; | |
2110 | if (xs->inet) | |
2111 | sk_clear_memalloc(xs->inet); | |
2112 | xprt_release_xprt(xprt, NULL); | |
a564b8f0 | 2113 | } |
a564b8f0 MG |
2114 | #else |
2115 | static void xs_set_memalloc(struct rpc_xprt *xprt) | |
2116 | { | |
2117 | } | |
d67fa4d8 JL |
2118 | |
2119 | static int | |
2120 | xs_enable_swap(struct rpc_xprt *xprt) | |
2121 | { | |
2122 | return -EINVAL; | |
2123 | } | |
2124 | ||
2125 | static void | |
2126 | xs_disable_swap(struct rpc_xprt *xprt) | |
2127 | { | |
2128 | } | |
a564b8f0 MG |
2129 | #endif |
2130 | ||
16be2d20 CL |
2131 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
2132 | { | |
2133 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
2134 | ||
2135 | if (!transport->inet) { | |
2136 | struct sock *sk = sock->sk; | |
2137 | ||
2138 | write_lock_bh(&sk->sk_callback_lock); | |
2139 | ||
2a9e1cfa TM |
2140 | xs_save_old_callbacks(transport, sk); |
2141 | ||
16be2d20 | 2142 | sk->sk_user_data = xprt; |
f9b2ee71 | 2143 | sk->sk_data_ready = xs_data_ready; |
16be2d20 | 2144 | sk->sk_write_space = xs_udp_write_space; |
b4411457 | 2145 | sock_set_flag(sk, SOCK_FASYNC); |
c2126157 | 2146 | sk->sk_allocation = GFP_NOIO; |
16be2d20 CL |
2147 | |
2148 | xprt_set_connected(xprt); | |
2149 | ||
2150 | /* Reset to new socket */ | |
2151 | transport->sock = sock; | |
2152 | transport->inet = sk; | |
2153 | ||
a564b8f0 MG |
2154 | xs_set_memalloc(xprt); |
2155 | ||
16be2d20 CL |
2156 | write_unlock_bh(&sk->sk_callback_lock); |
2157 | } | |
2158 | xs_udp_do_set_buffer_size(xprt); | |
2159 | } | |
2160 | ||
8c14ff2a | 2161 | static void xs_udp_setup_socket(struct work_struct *work) |
a246b010 | 2162 | { |
34161db6 TM |
2163 | struct sock_xprt *transport = |
2164 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 2165 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 2166 | struct socket *sock = transport->sock; |
b65c0310 | 2167 | int status = -EIO; |
9903cd1c | 2168 | |
8c14ff2a | 2169 | sock = xs_create_sock(xprt, transport, |
4dda9c8a TM |
2170 | xs_addr(xprt)->sa_family, SOCK_DGRAM, |
2171 | IPPROTO_UDP, false); | |
b65c0310 | 2172 | if (IS_ERR(sock)) |
b0d93ad5 | 2173 | goto out; |
68e220bd | 2174 | |
c740eff8 CL |
2175 | dprintk("RPC: worker connecting xprt %p via %s to " |
2176 | "%s (port %s)\n", xprt, | |
2177 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2178 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2179 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
68e220bd CL |
2180 | |
2181 | xs_udp_finish_connecting(xprt, sock); | |
40b5ea0c | 2182 | trace_rpc_socket_connect(xprt, sock, 0); |
b0d93ad5 CL |
2183 | status = 0; |
2184 | out: | |
718ba5b8 | 2185 | xprt_unlock_connect(xprt, transport); |
b0d93ad5 | 2186 | xprt_clear_connecting(xprt); |
7d1e8255 | 2187 | xprt_wake_pending_tasks(xprt, status); |
a246b010 CL |
2188 | } |
2189 | ||
4876cc77 TM |
2190 | /** |
2191 | * xs_tcp_shutdown - gracefully shut down a TCP socket | |
2192 | * @xprt: transport | |
2193 | * | |
2194 | * Initiates a graceful shutdown of the TCP socket by calling the | |
2195 | * equivalent of shutdown(SHUT_RDWR); | |
2196 | */ | |
2197 | static void xs_tcp_shutdown(struct rpc_xprt *xprt) | |
2198 | { | |
2199 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
2200 | struct socket *sock = transport->sock; | |
2201 | ||
2202 | if (sock == NULL) | |
2203 | return; | |
2204 | if (xprt_connected(xprt)) { | |
2205 | kernel_sock_shutdown(sock, SHUT_RDWR); | |
2206 | trace_rpc_socket_shutdown(xprt, sock); | |
2207 | } else | |
2208 | xs_reset_transport(transport); | |
2209 | } | |
2210 | ||
16be2d20 | 2211 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 2212 | { |
16be2d20 | 2213 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
fe19a96b | 2214 | int ret = -ENOTCONN; |
edb267a6 | 2215 | |
ee0ac0c2 | 2216 | if (!transport->inet) { |
b0d93ad5 | 2217 | struct sock *sk = sock->sk; |
7f260e85 TM |
2218 | unsigned int keepidle = xprt->timeout->to_initval / HZ; |
2219 | unsigned int keepcnt = xprt->timeout->to_retries + 1; | |
2220 | unsigned int opt_on = 1; | |
775f06ab | 2221 | unsigned int timeo; |
7f260e85 TM |
2222 | |
2223 | /* TCP Keepalive options */ | |
2224 | kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, | |
2225 | (char *)&opt_on, sizeof(opt_on)); | |
2226 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, | |
2227 | (char *)&keepidle, sizeof(keepidle)); | |
2228 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, | |
2229 | (char *)&keepidle, sizeof(keepidle)); | |
2230 | kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, | |
2231 | (char *)&keepcnt, sizeof(keepcnt)); | |
b0d93ad5 | 2232 | |
775f06ab TM |
2233 | /* TCP user timeout (see RFC5482) */ |
2234 | timeo = jiffies_to_msecs(xprt->timeout->to_initval) * | |
2235 | (xprt->timeout->to_retries + 1); | |
2236 | kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, | |
2237 | (char *)&timeo, sizeof(timeo)); | |
2238 | ||
b0d93ad5 CL |
2239 | write_lock_bh(&sk->sk_callback_lock); |
2240 | ||
2a9e1cfa TM |
2241 | xs_save_old_callbacks(transport, sk); |
2242 | ||
b0d93ad5 | 2243 | sk->sk_user_data = xprt; |
b0d93ad5 CL |
2244 | sk->sk_data_ready = xs_tcp_data_ready; |
2245 | sk->sk_state_change = xs_tcp_state_change; | |
2246 | sk->sk_write_space = xs_tcp_write_space; | |
b4411457 | 2247 | sock_set_flag(sk, SOCK_FASYNC); |
2118071d | 2248 | sk->sk_error_report = xs_error_report; |
c2126157 | 2249 | sk->sk_allocation = GFP_NOIO; |
3167e12c CL |
2250 | |
2251 | /* socket options */ | |
3167e12c | 2252 | sock_reset_flag(sk, SOCK_LINGER); |
3167e12c | 2253 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
b0d93ad5 CL |
2254 | |
2255 | xprt_clear_connected(xprt); | |
2256 | ||
2257 | /* Reset to new socket */ | |
ee0ac0c2 CL |
2258 | transport->sock = sock; |
2259 | transport->inet = sk; | |
b0d93ad5 CL |
2260 | |
2261 | write_unlock_bh(&sk->sk_callback_lock); | |
2262 | } | |
2263 | ||
01d37c42 | 2264 | if (!xprt_bound(xprt)) |
fe19a96b | 2265 | goto out; |
01d37c42 | 2266 | |
a564b8f0 MG |
2267 | xs_set_memalloc(xprt); |
2268 | ||
b0d93ad5 | 2269 | /* Tell the socket layer to start connecting... */ |
262ca07d CL |
2270 | xprt->stat.connect_count++; |
2271 | xprt->stat.connect_start = jiffies; | |
0fdea1e8 | 2272 | set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); |
fe19a96b TM |
2273 | ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
2274 | switch (ret) { | |
2275 | case 0: | |
4dda9c8a | 2276 | xs_set_srcport(transport, sock); |
fe19a96b TM |
2277 | case -EINPROGRESS: |
2278 | /* SYN_SENT! */ | |
fe19a96b TM |
2279 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2280 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2281 | } | |
2282 | out: | |
2283 | return ret; | |
16be2d20 CL |
2284 | } |
2285 | ||
9903cd1c | 2286 | /** |
b61d59ff | 2287 | * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
9903cd1c CL |
2288 | * |
2289 | * Invoked by a work queue tasklet. | |
a246b010 | 2290 | */ |
cdd518d5 | 2291 | static void xs_tcp_setup_socket(struct work_struct *work) |
a246b010 | 2292 | { |
cdd518d5 PE |
2293 | struct sock_xprt *transport = |
2294 | container_of(work, struct sock_xprt, connect_worker.work); | |
ee0ac0c2 | 2295 | struct socket *sock = transport->sock; |
a9f5f0f7 | 2296 | struct rpc_xprt *xprt = &transport->xprt; |
b61d59ff | 2297 | int status = -EIO; |
a246b010 | 2298 | |
ee0ac0c2 | 2299 | if (!sock) { |
cdd518d5 | 2300 | sock = xs_create_sock(xprt, transport, |
4dda9c8a TM |
2301 | xs_addr(xprt)->sa_family, SOCK_STREAM, |
2302 | IPPROTO_TCP, true); | |
b61d59ff TM |
2303 | if (IS_ERR(sock)) { |
2304 | status = PTR_ERR(sock); | |
3167e12c CL |
2305 | goto out; |
2306 | } | |
7d1e8255 | 2307 | } |
a246b010 | 2308 | |
c740eff8 CL |
2309 | dprintk("RPC: worker connecting xprt %p via %s to " |
2310 | "%s (port %s)\n", xprt, | |
2311 | xprt->address_strings[RPC_DISPLAY_PROTO], | |
2312 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2313 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
edb267a6 | 2314 | |
16be2d20 | 2315 | status = xs_tcp_finish_connecting(xprt, sock); |
40b5ea0c | 2316 | trace_rpc_socket_connect(xprt, sock, status); |
46121cf7 CL |
2317 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
2318 | xprt, -status, xprt_connected(xprt), | |
2319 | sock->sk->sk_state); | |
2a491991 | 2320 | switch (status) { |
f75e6745 TM |
2321 | default: |
2322 | printk("%s: connect returned unhandled error %d\n", | |
2323 | __func__, status); | |
2324 | case -EADDRNOTAVAIL: | |
2325 | /* We're probably in TIME_WAIT. Get rid of existing socket, | |
2326 | * and retry | |
2327 | */ | |
a519fc7a | 2328 | xs_tcp_force_close(xprt); |
88b5ed73 | 2329 | break; |
2a491991 TM |
2330 | case 0: |
2331 | case -EINPROGRESS: | |
2332 | case -EALREADY: | |
718ba5b8 | 2333 | xprt_unlock_connect(xprt, transport); |
7d1e8255 | 2334 | return; |
9fcfe0c8 TM |
2335 | case -EINVAL: |
2336 | /* Happens, for instance, if the user specified a link | |
2337 | * local IPv6 address without a scope-id. | |
2338 | */ | |
3ed5e2a2 TM |
2339 | case -ECONNREFUSED: |
2340 | case -ECONNRESET: | |
2341 | case -ENETUNREACH: | |
3913c78c | 2342 | case -EADDRINUSE: |
3601c4a9 | 2343 | case -ENOBUFS: |
3ed5e2a2 | 2344 | /* retry with existing socket, after a delay */ |
4efdd92c | 2345 | xs_tcp_force_close(xprt); |
9fcfe0c8 | 2346 | goto out; |
a246b010 | 2347 | } |
2a491991 | 2348 | status = -EAGAIN; |
a246b010 | 2349 | out: |
718ba5b8 | 2350 | xprt_unlock_connect(xprt, transport); |
68e220bd | 2351 | xprt_clear_connecting(xprt); |
7d1e8255 | 2352 | xprt_wake_pending_tasks(xprt, status); |
68e220bd | 2353 | } |
b0d93ad5 | 2354 | |
9903cd1c CL |
2355 | /** |
2356 | * xs_connect - connect a socket to a remote endpoint | |
1b092092 | 2357 | * @xprt: pointer to transport structure |
9903cd1c CL |
2358 | * @task: address of RPC task that manages state of connect request |
2359 | * | |
2360 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
2361 | * |
2362 | * UDP socket connects are synchronous, but we use a work queue anyway | |
2363 | * to guarantee that even unprivileged user processes can set up a | |
2364 | * socket on a privileged port. | |
2365 | * | |
2366 | * If a UDP socket connect fails, the delay behavior here prevents | |
2367 | * retry floods (hard mounts). | |
9903cd1c | 2368 | */ |
1b092092 | 2369 | static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
a246b010 | 2370 | { |
ee0ac0c2 | 2371 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2372 | |
718ba5b8 TM |
2373 | WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); |
2374 | ||
99b1a4c3 | 2375 | if (transport->sock != NULL) { |
46121cf7 CL |
2376 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
2377 | "seconds\n", | |
03bf4b70 | 2378 | xprt, xprt->reestablish_timeout / HZ); |
99b1a4c3 TM |
2379 | |
2380 | /* Start by resetting any existing state */ | |
2381 | xs_reset_transport(transport); | |
2382 | ||
c1384c9c TM |
2383 | queue_delayed_work(rpciod_workqueue, |
2384 | &transport->connect_worker, | |
2385 | xprt->reestablish_timeout); | |
03bf4b70 | 2386 | xprt->reestablish_timeout <<= 1; |
61d0a8e6 NB |
2387 | if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
2388 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
03bf4b70 CL |
2389 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
2390 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 2391 | } else { |
46121cf7 | 2392 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
2393 | queue_delayed_work(rpciod_workqueue, |
2394 | &transport->connect_worker, 0); | |
a246b010 CL |
2395 | } |
2396 | } | |
2397 | ||
176e21ee CL |
2398 | /** |
2399 | * xs_local_print_stats - display AF_LOCAL socket-specifc stats | |
2400 | * @xprt: rpc_xprt struct containing statistics | |
2401 | * @seq: output file | |
2402 | * | |
2403 | */ | |
2404 | static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2405 | { | |
2406 | long idle_time = 0; | |
2407 | ||
2408 | if (xprt_connected(xprt)) | |
2409 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2410 | ||
2411 | seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " | |
15a45206 | 2412 | "%llu %llu %lu %llu %llu\n", |
176e21ee CL |
2413 | xprt->stat.bind_count, |
2414 | xprt->stat.connect_count, | |
2415 | xprt->stat.connect_time, | |
2416 | idle_time, | |
2417 | xprt->stat.sends, | |
2418 | xprt->stat.recvs, | |
2419 | xprt->stat.bad_xids, | |
2420 | xprt->stat.req_u, | |
15a45206 AA |
2421 | xprt->stat.bklog_u, |
2422 | xprt->stat.max_slots, | |
2423 | xprt->stat.sending_u, | |
2424 | xprt->stat.pending_u); | |
176e21ee CL |
2425 | } |
2426 | ||
262ca07d CL |
2427 | /** |
2428 | * xs_udp_print_stats - display UDP socket-specifc stats | |
2429 | * @xprt: rpc_xprt struct containing statistics | |
2430 | * @seq: output file | |
2431 | * | |
2432 | */ | |
2433 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2434 | { | |
c8475461 CL |
2435 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
2436 | ||
15a45206 AA |
2437 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " |
2438 | "%lu %llu %llu\n", | |
fbfffbd5 | 2439 | transport->srcport, |
262ca07d CL |
2440 | xprt->stat.bind_count, |
2441 | xprt->stat.sends, | |
2442 | xprt->stat.recvs, | |
2443 | xprt->stat.bad_xids, | |
2444 | xprt->stat.req_u, | |
15a45206 AA |
2445 | xprt->stat.bklog_u, |
2446 | xprt->stat.max_slots, | |
2447 | xprt->stat.sending_u, | |
2448 | xprt->stat.pending_u); | |
262ca07d CL |
2449 | } |
2450 | ||
2451 | /** | |
2452 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
2453 | * @xprt: rpc_xprt struct containing statistics | |
2454 | * @seq: output file | |
2455 | * | |
2456 | */ | |
2457 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
2458 | { | |
c8475461 | 2459 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
2460 | long idle_time = 0; |
2461 | ||
2462 | if (xprt_connected(xprt)) | |
2463 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
2464 | ||
15a45206 AA |
2465 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " |
2466 | "%llu %llu %lu %llu %llu\n", | |
fbfffbd5 | 2467 | transport->srcport, |
262ca07d CL |
2468 | xprt->stat.bind_count, |
2469 | xprt->stat.connect_count, | |
2470 | xprt->stat.connect_time, | |
2471 | idle_time, | |
2472 | xprt->stat.sends, | |
2473 | xprt->stat.recvs, | |
2474 | xprt->stat.bad_xids, | |
2475 | xprt->stat.req_u, | |
15a45206 AA |
2476 | xprt->stat.bklog_u, |
2477 | xprt->stat.max_slots, | |
2478 | xprt->stat.sending_u, | |
2479 | xprt->stat.pending_u); | |
262ca07d CL |
2480 | } |
2481 | ||
4cfc7e60 RI |
2482 | /* |
2483 | * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason | |
2484 | * we allocate pages instead doing a kmalloc like rpc_malloc is because we want | |
2485 | * to use the server side send routines. | |
2486 | */ | |
5a51f13a | 2487 | static void *bc_malloc(struct rpc_task *task, size_t size) |
4cfc7e60 RI |
2488 | { |
2489 | struct page *page; | |
2490 | struct rpc_buffer *buf; | |
2491 | ||
b8a13d03 WAA |
2492 | WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); |
2493 | if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) | |
2494 | return NULL; | |
4cfc7e60 | 2495 | |
b8a13d03 | 2496 | page = alloc_page(GFP_KERNEL); |
4cfc7e60 RI |
2497 | if (!page) |
2498 | return NULL; | |
2499 | ||
2500 | buf = page_address(page); | |
2501 | buf->len = PAGE_SIZE; | |
2502 | ||
2503 | return buf->data; | |
2504 | } | |
2505 | ||
2506 | /* | |
2507 | * Free the space allocated in the bc_alloc routine | |
2508 | */ | |
5a51f13a | 2509 | static void bc_free(void *buffer) |
4cfc7e60 RI |
2510 | { |
2511 | struct rpc_buffer *buf; | |
2512 | ||
2513 | if (!buffer) | |
2514 | return; | |
2515 | ||
2516 | buf = container_of(buffer, struct rpc_buffer, data); | |
2517 | free_page((unsigned long)buf); | |
2518 | } | |
2519 | ||
2520 | /* | |
2521 | * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex | |
2522 | * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. | |
2523 | */ | |
2524 | static int bc_sendto(struct rpc_rqst *req) | |
2525 | { | |
2526 | int len; | |
2527 | struct xdr_buf *xbufp = &req->rq_snd_buf; | |
2528 | struct rpc_xprt *xprt = req->rq_xprt; | |
2529 | struct sock_xprt *transport = | |
2530 | container_of(xprt, struct sock_xprt, xprt); | |
2531 | struct socket *sock = transport->sock; | |
2532 | unsigned long headoff; | |
2533 | unsigned long tailoff; | |
2534 | ||
61677eee | 2535 | xs_encode_stream_record_marker(xbufp); |
4cfc7e60 RI |
2536 | |
2537 | tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; | |
2538 | headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; | |
2539 | len = svc_send_common(sock, xbufp, | |
2540 | virt_to_page(xbufp->head[0].iov_base), headoff, | |
2541 | xbufp->tail[0].iov_base, tailoff); | |
2542 | ||
2543 | if (len != xbufp->len) { | |
2544 | printk(KERN_NOTICE "Error sending entire callback!\n"); | |
2545 | len = -EAGAIN; | |
2546 | } | |
2547 | ||
2548 | return len; | |
2549 | } | |
2550 | ||
2551 | /* | |
2552 | * The send routine. Borrows from svc_send | |
2553 | */ | |
2554 | static int bc_send_request(struct rpc_task *task) | |
2555 | { | |
2556 | struct rpc_rqst *req = task->tk_rqstp; | |
2557 | struct svc_xprt *xprt; | |
7fc56136 | 2558 | int len; |
4cfc7e60 RI |
2559 | |
2560 | dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); | |
2561 | /* | |
2562 | * Get the server socket associated with this callback xprt | |
2563 | */ | |
2564 | xprt = req->rq_xprt->bc_xprt; | |
4cfc7e60 RI |
2565 | |
2566 | /* | |
2567 | * Grab the mutex to serialize data as the connection is shared | |
2568 | * with the fore channel | |
2569 | */ | |
2570 | if (!mutex_trylock(&xprt->xpt_mutex)) { | |
2571 | rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); | |
2572 | if (!mutex_trylock(&xprt->xpt_mutex)) | |
2573 | return -EAGAIN; | |
2574 | rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); | |
2575 | } | |
2576 | if (test_bit(XPT_DEAD, &xprt->xpt_flags)) | |
2577 | len = -ENOTCONN; | |
2578 | else | |
2579 | len = bc_sendto(req); | |
2580 | mutex_unlock(&xprt->xpt_mutex); | |
2581 | ||
2582 | if (len > 0) | |
2583 | len = 0; | |
2584 | ||
2585 | return len; | |
2586 | } | |
2587 | ||
2588 | /* | |
2589 | * The close routine. Since this is client initiated, we do nothing | |
2590 | */ | |
2591 | ||
2592 | static void bc_close(struct rpc_xprt *xprt) | |
2593 | { | |
4cfc7e60 RI |
2594 | } |
2595 | ||
2596 | /* | |
2597 | * The xprt destroy routine. Again, because this connection is client | |
2598 | * initiated, we do nothing | |
2599 | */ | |
2600 | ||
2601 | static void bc_destroy(struct rpc_xprt *xprt) | |
2602 | { | |
47f72efa KM |
2603 | dprintk("RPC: bc_destroy xprt %p\n", xprt); |
2604 | ||
2605 | xs_xprt_free(xprt); | |
2606 | module_put(THIS_MODULE); | |
4cfc7e60 RI |
2607 | } |
2608 | ||
176e21ee CL |
2609 | static struct rpc_xprt_ops xs_local_ops = { |
2610 | .reserve_xprt = xprt_reserve_xprt, | |
2611 | .release_xprt = xs_tcp_release_xprt, | |
f39c1bfb | 2612 | .alloc_slot = xprt_alloc_slot, |
176e21ee CL |
2613 | .rpcbind = xs_local_rpcbind, |
2614 | .set_port = xs_local_set_port, | |
dc107402 | 2615 | .connect = xs_local_connect, |
176e21ee CL |
2616 | .buf_alloc = rpc_malloc, |
2617 | .buf_free = rpc_free, | |
2618 | .send_request = xs_local_send_request, | |
2619 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2620 | .close = xs_close, | |
a1311d87 | 2621 | .destroy = xs_destroy, |
176e21ee | 2622 | .print_stats = xs_local_print_stats, |
d67fa4d8 JL |
2623 | .enable_swap = xs_enable_swap, |
2624 | .disable_swap = xs_disable_swap, | |
176e21ee CL |
2625 | }; |
2626 | ||
262965f5 | 2627 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 2628 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 2629 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 2630 | .release_xprt = xprt_release_xprt_cong, |
f39c1bfb | 2631 | .alloc_slot = xprt_alloc_slot, |
45160d62 | 2632 | .rpcbind = rpcb_getport_async, |
92200412 | 2633 | .set_port = xs_set_port, |
262965f5 | 2634 | .connect = xs_connect, |
02107148 CL |
2635 | .buf_alloc = rpc_malloc, |
2636 | .buf_free = rpc_free, | |
262965f5 | 2637 | .send_request = xs_udp_send_request, |
fe3aca29 | 2638 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 2639 | .timer = xs_udp_timer, |
a58dd398 | 2640 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
2641 | .close = xs_close, |
2642 | .destroy = xs_destroy, | |
262ca07d | 2643 | .print_stats = xs_udp_print_stats, |
d67fa4d8 JL |
2644 | .enable_swap = xs_enable_swap, |
2645 | .disable_swap = xs_disable_swap, | |
4a068258 | 2646 | .inject_disconnect = xs_inject_disconnect, |
262965f5 CL |
2647 | }; |
2648 | ||
2649 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 2650 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 2651 | .release_xprt = xs_tcp_release_xprt, |
f39c1bfb | 2652 | .alloc_slot = xprt_lock_and_alloc_slot, |
45160d62 | 2653 | .rpcbind = rpcb_getport_async, |
92200412 | 2654 | .set_port = xs_set_port, |
0b9e7943 | 2655 | .connect = xs_connect, |
02107148 CL |
2656 | .buf_alloc = rpc_malloc, |
2657 | .buf_free = rpc_free, | |
262965f5 | 2658 | .send_request = xs_tcp_send_request, |
fe3aca29 | 2659 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
c627d31b | 2660 | .close = xs_tcp_shutdown, |
9903cd1c | 2661 | .destroy = xs_destroy, |
262ca07d | 2662 | .print_stats = xs_tcp_print_stats, |
d67fa4d8 JL |
2663 | .enable_swap = xs_enable_swap, |
2664 | .disable_swap = xs_disable_swap, | |
4a068258 | 2665 | .inject_disconnect = xs_inject_disconnect, |
42e5c3e2 CL |
2666 | #ifdef CONFIG_SUNRPC_BACKCHANNEL |
2667 | .bc_setup = xprt_setup_bc, | |
76566773 | 2668 | .bc_up = xs_tcp_bc_up, |
6b26cc8c | 2669 | .bc_maxpayload = xs_tcp_bc_maxpayload, |
42e5c3e2 CL |
2670 | .bc_free_rqst = xprt_free_bc_rqst, |
2671 | .bc_destroy = xprt_destroy_bc, | |
2672 | #endif | |
a246b010 CL |
2673 | }; |
2674 | ||
4cfc7e60 RI |
2675 | /* |
2676 | * The rpc_xprt_ops for the server backchannel | |
2677 | */ | |
2678 | ||
2679 | static struct rpc_xprt_ops bc_tcp_ops = { | |
2680 | .reserve_xprt = xprt_reserve_xprt, | |
2681 | .release_xprt = xprt_release_xprt, | |
84e28a30 | 2682 | .alloc_slot = xprt_alloc_slot, |
4cfc7e60 RI |
2683 | .buf_alloc = bc_malloc, |
2684 | .buf_free = bc_free, | |
2685 | .send_request = bc_send_request, | |
2686 | .set_retrans_timeout = xprt_set_retrans_timeout_def, | |
2687 | .close = bc_close, | |
2688 | .destroy = bc_destroy, | |
2689 | .print_stats = xs_tcp_print_stats, | |
d67fa4d8 JL |
2690 | .enable_swap = xs_enable_swap, |
2691 | .disable_swap = xs_disable_swap, | |
4a068258 | 2692 | .inject_disconnect = xs_inject_disconnect, |
4cfc7e60 RI |
2693 | }; |
2694 | ||
92476850 CL |
2695 | static int xs_init_anyaddr(const int family, struct sockaddr *sap) |
2696 | { | |
2697 | static const struct sockaddr_in sin = { | |
2698 | .sin_family = AF_INET, | |
2699 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
2700 | }; | |
2701 | static const struct sockaddr_in6 sin6 = { | |
2702 | .sin6_family = AF_INET6, | |
2703 | .sin6_addr = IN6ADDR_ANY_INIT, | |
2704 | }; | |
2705 | ||
2706 | switch (family) { | |
176e21ee CL |
2707 | case AF_LOCAL: |
2708 | break; | |
92476850 CL |
2709 | case AF_INET: |
2710 | memcpy(sap, &sin, sizeof(sin)); | |
2711 | break; | |
2712 | case AF_INET6: | |
2713 | memcpy(sap, &sin6, sizeof(sin6)); | |
2714 | break; | |
2715 | default: | |
2716 | dprintk("RPC: %s: Bad address family\n", __func__); | |
2717 | return -EAFNOSUPPORT; | |
2718 | } | |
2719 | return 0; | |
2720 | } | |
2721 | ||
3c341b0b | 2722 | static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, |
d9ba131d TM |
2723 | unsigned int slot_table_size, |
2724 | unsigned int max_slot_table_size) | |
c8541ecd CL |
2725 | { |
2726 | struct rpc_xprt *xprt; | |
ffc2e518 | 2727 | struct sock_xprt *new; |
c8541ecd | 2728 | |
96802a09 | 2729 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 2730 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
2731 | return ERR_PTR(-EBADF); |
2732 | } | |
2733 | ||
d9ba131d TM |
2734 | xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, |
2735 | max_slot_table_size); | |
bd1722d4 | 2736 | if (xprt == NULL) { |
46121cf7 CL |
2737 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
2738 | "rpc_xprt\n"); | |
c8541ecd CL |
2739 | return ERR_PTR(-ENOMEM); |
2740 | } | |
c8541ecd | 2741 | |
bd1722d4 | 2742 | new = container_of(xprt, struct sock_xprt, xprt); |
edc1b01c | 2743 | mutex_init(&new->recv_mutex); |
96802a09 FM |
2744 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
2745 | xprt->addrlen = args->addrlen; | |
d3bc9a1d | 2746 | if (args->srcaddr) |
fbfffbd5 | 2747 | memcpy(&new->srcaddr, args->srcaddr, args->addrlen); |
92476850 CL |
2748 | else { |
2749 | int err; | |
2750 | err = xs_init_anyaddr(args->dstaddr->sa_family, | |
2751 | (struct sockaddr *)&new->srcaddr); | |
2aa13531 SK |
2752 | if (err != 0) { |
2753 | xprt_free(xprt); | |
92476850 | 2754 | return ERR_PTR(err); |
2aa13531 | 2755 | } |
92476850 | 2756 | } |
c8541ecd CL |
2757 | |
2758 | return xprt; | |
2759 | } | |
2760 | ||
176e21ee CL |
2761 | static const struct rpc_timeout xs_local_default_timeout = { |
2762 | .to_initval = 10 * HZ, | |
2763 | .to_maxval = 10 * HZ, | |
2764 | .to_retries = 2, | |
2765 | }; | |
2766 | ||
2767 | /** | |
2768 | * xs_setup_local - Set up transport to use an AF_LOCAL socket | |
2769 | * @args: rpc transport creation arguments | |
2770 | * | |
2771 | * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP | |
2772 | */ | |
2773 | static struct rpc_xprt *xs_setup_local(struct xprt_create *args) | |
2774 | { | |
2775 | struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; | |
2776 | struct sock_xprt *transport; | |
2777 | struct rpc_xprt *xprt; | |
2778 | struct rpc_xprt *ret; | |
2779 | ||
d9ba131d TM |
2780 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
2781 | xprt_max_tcp_slot_table_entries); | |
176e21ee CL |
2782 | if (IS_ERR(xprt)) |
2783 | return xprt; | |
2784 | transport = container_of(xprt, struct sock_xprt, xprt); | |
2785 | ||
2786 | xprt->prot = 0; | |
2787 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
2788 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
2789 | ||
2790 | xprt->bind_timeout = XS_BIND_TO; | |
2791 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
2792 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
2793 | ||
2794 | xprt->ops = &xs_local_ops; | |
2795 | xprt->timeout = &xs_local_default_timeout; | |
2796 | ||
a2648094 | 2797 | INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn); |
93dc41bd N |
2798 | INIT_DELAYED_WORK(&transport->connect_worker, |
2799 | xs_dummy_setup_socket); | |
2800 | ||
176e21ee CL |
2801 | switch (sun->sun_family) { |
2802 | case AF_LOCAL: | |
2803 | if (sun->sun_path[0] != '/') { | |
2804 | dprintk("RPC: bad AF_LOCAL address: %s\n", | |
2805 | sun->sun_path); | |
2806 | ret = ERR_PTR(-EINVAL); | |
2807 | goto out_err; | |
2808 | } | |
2809 | xprt_set_bound(xprt); | |
176e21ee | 2810 | xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); |
7073ea87 BF |
2811 | ret = ERR_PTR(xs_local_setup_socket(transport)); |
2812 | if (ret) | |
2813 | goto out_err; | |
176e21ee CL |
2814 | break; |
2815 | default: | |
2816 | ret = ERR_PTR(-EAFNOSUPPORT); | |
2817 | goto out_err; | |
2818 | } | |
2819 | ||
2820 | dprintk("RPC: set up xprt to %s via AF_LOCAL\n", | |
2821 | xprt->address_strings[RPC_DISPLAY_ADDR]); | |
2822 | ||
2823 | if (try_module_get(THIS_MODULE)) | |
2824 | return xprt; | |
2825 | ret = ERR_PTR(-EINVAL); | |
2826 | out_err: | |
315f3812 | 2827 | xs_xprt_free(xprt); |
176e21ee CL |
2828 | return ret; |
2829 | } | |
2830 | ||
2881ae74 TM |
2831 | static const struct rpc_timeout xs_udp_default_timeout = { |
2832 | .to_initval = 5 * HZ, | |
2833 | .to_maxval = 30 * HZ, | |
2834 | .to_increment = 5 * HZ, | |
2835 | .to_retries = 5, | |
2836 | }; | |
2837 | ||
9903cd1c CL |
2838 | /** |
2839 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 2840 | * @args: rpc transport creation arguments |
9903cd1c CL |
2841 | * |
2842 | */ | |
483066d6 | 2843 | static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) |
a246b010 | 2844 | { |
8f9d5b1a | 2845 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2846 | struct rpc_xprt *xprt; |
c8475461 | 2847 | struct sock_xprt *transport; |
0a68b0be | 2848 | struct rpc_xprt *ret; |
a246b010 | 2849 | |
d9ba131d TM |
2850 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, |
2851 | xprt_udp_slot_table_entries); | |
c8541ecd CL |
2852 | if (IS_ERR(xprt)) |
2853 | return xprt; | |
c8475461 | 2854 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2855 | |
ec739ef0 | 2856 | xprt->prot = IPPROTO_UDP; |
808012fb | 2857 | xprt->tsh_size = 0; |
a246b010 CL |
2858 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
2859 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
2860 | ||
03bf4b70 | 2861 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2862 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
2863 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2864 | |
262965f5 | 2865 | xprt->ops = &xs_udp_ops; |
a246b010 | 2866 | |
ba7392bb | 2867 | xprt->timeout = &xs_udp_default_timeout; |
a246b010 | 2868 | |
f9b2ee71 | 2869 | INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); |
edc1b01c TM |
2870 | INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); |
2871 | ||
8f9d5b1a CL |
2872 | switch (addr->sa_family) { |
2873 | case AF_INET: | |
2874 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2875 | xprt_set_bound(xprt); | |
2876 | ||
9dc3b095 | 2877 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); |
8f9d5b1a CL |
2878 | break; |
2879 | case AF_INET6: | |
2880 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2881 | xprt_set_bound(xprt); | |
2882 | ||
9dc3b095 | 2883 | xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); |
8f9d5b1a CL |
2884 | break; |
2885 | default: | |
0a68b0be BF |
2886 | ret = ERR_PTR(-EAFNOSUPPORT); |
2887 | goto out_err; | |
8f9d5b1a CL |
2888 | } |
2889 | ||
c740eff8 CL |
2890 | if (xprt_bound(xprt)) |
2891 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2892 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2893 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2894 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2895 | else | |
2896 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2897 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2898 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
edb267a6 | 2899 | |
bc25571e TT |
2900 | if (try_module_get(THIS_MODULE)) |
2901 | return xprt; | |
0a68b0be BF |
2902 | ret = ERR_PTR(-EINVAL); |
2903 | out_err: | |
315f3812 | 2904 | xs_xprt_free(xprt); |
0a68b0be | 2905 | return ret; |
a246b010 CL |
2906 | } |
2907 | ||
2881ae74 TM |
2908 | static const struct rpc_timeout xs_tcp_default_timeout = { |
2909 | .to_initval = 60 * HZ, | |
2910 | .to_maxval = 60 * HZ, | |
2911 | .to_retries = 2, | |
2912 | }; | |
2913 | ||
9903cd1c CL |
2914 | /** |
2915 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 2916 | * @args: rpc transport creation arguments |
9903cd1c CL |
2917 | * |
2918 | */ | |
483066d6 | 2919 | static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) |
a246b010 | 2920 | { |
8f9d5b1a | 2921 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 2922 | struct rpc_xprt *xprt; |
c8475461 | 2923 | struct sock_xprt *transport; |
0a68b0be | 2924 | struct rpc_xprt *ret; |
b7993ceb TM |
2925 | unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; |
2926 | ||
2927 | if (args->flags & XPRT_CREATE_INFINITE_SLOTS) | |
2928 | max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; | |
a246b010 | 2929 | |
d9ba131d | 2930 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
b7993ceb | 2931 | max_slot_table_size); |
c8541ecd CL |
2932 | if (IS_ERR(xprt)) |
2933 | return xprt; | |
c8475461 | 2934 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 2935 | |
ec739ef0 | 2936 | xprt->prot = IPPROTO_TCP; |
808012fb | 2937 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 2938 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 2939 | |
03bf4b70 | 2940 | xprt->bind_timeout = XS_BIND_TO; |
03bf4b70 CL |
2941 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
2942 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 2943 | |
262965f5 | 2944 | xprt->ops = &xs_tcp_ops; |
ba7392bb | 2945 | xprt->timeout = &xs_tcp_default_timeout; |
a246b010 | 2946 | |
edc1b01c TM |
2947 | INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn); |
2948 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); | |
2949 | ||
8f9d5b1a CL |
2950 | switch (addr->sa_family) { |
2951 | case AF_INET: | |
2952 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
2953 | xprt_set_bound(xprt); | |
2954 | ||
9dc3b095 | 2955 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
8f9d5b1a CL |
2956 | break; |
2957 | case AF_INET6: | |
2958 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
2959 | xprt_set_bound(xprt); | |
2960 | ||
9dc3b095 | 2961 | xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
8f9d5b1a CL |
2962 | break; |
2963 | default: | |
0a68b0be BF |
2964 | ret = ERR_PTR(-EAFNOSUPPORT); |
2965 | goto out_err; | |
8f9d5b1a CL |
2966 | } |
2967 | ||
c740eff8 CL |
2968 | if (xprt_bound(xprt)) |
2969 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", | |
2970 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2971 | xprt->address_strings[RPC_DISPLAY_PORT], | |
2972 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2973 | else | |
2974 | dprintk("RPC: set up xprt to %s (autobind) via %s\n", | |
2975 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
2976 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
2977 | ||
bc25571e TT |
2978 | if (try_module_get(THIS_MODULE)) |
2979 | return xprt; | |
0a68b0be BF |
2980 | ret = ERR_PTR(-EINVAL); |
2981 | out_err: | |
315f3812 | 2982 | xs_xprt_free(xprt); |
0a68b0be | 2983 | return ret; |
a246b010 | 2984 | } |
282b32e1 | 2985 | |
f300baba AB |
2986 | /** |
2987 | * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket | |
2988 | * @args: rpc transport creation arguments | |
2989 | * | |
2990 | */ | |
2991 | static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) | |
2992 | { | |
2993 | struct sockaddr *addr = args->dstaddr; | |
2994 | struct rpc_xprt *xprt; | |
2995 | struct sock_xprt *transport; | |
2996 | struct svc_sock *bc_sock; | |
0a68b0be | 2997 | struct rpc_xprt *ret; |
f300baba | 2998 | |
d9ba131d TM |
2999 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
3000 | xprt_tcp_slot_table_entries); | |
f300baba AB |
3001 | if (IS_ERR(xprt)) |
3002 | return xprt; | |
3003 | transport = container_of(xprt, struct sock_xprt, xprt); | |
3004 | ||
3005 | xprt->prot = IPPROTO_TCP; | |
3006 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); | |
3007 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; | |
3008 | xprt->timeout = &xs_tcp_default_timeout; | |
3009 | ||
3010 | /* backchannel */ | |
3011 | xprt_set_bound(xprt); | |
3012 | xprt->bind_timeout = 0; | |
f300baba AB |
3013 | xprt->reestablish_timeout = 0; |
3014 | xprt->idle_timeout = 0; | |
3015 | ||
f300baba AB |
3016 | xprt->ops = &bc_tcp_ops; |
3017 | ||
3018 | switch (addr->sa_family) { | |
3019 | case AF_INET: | |
3020 | xs_format_peer_addresses(xprt, "tcp", | |
3021 | RPCBIND_NETID_TCP); | |
3022 | break; | |
3023 | case AF_INET6: | |
3024 | xs_format_peer_addresses(xprt, "tcp", | |
3025 | RPCBIND_NETID_TCP6); | |
3026 | break; | |
3027 | default: | |
0a68b0be BF |
3028 | ret = ERR_PTR(-EAFNOSUPPORT); |
3029 | goto out_err; | |
f300baba AB |
3030 | } |
3031 | ||
50fa0d40 PE |
3032 | dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
3033 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
3034 | xprt->address_strings[RPC_DISPLAY_PORT], | |
3035 | xprt->address_strings[RPC_DISPLAY_PROTO]); | |
f300baba | 3036 | |
99de8ea9 BF |
3037 | /* |
3038 | * Once we've associated a backchannel xprt with a connection, | |
28303ca3 WM |
3039 | * we want to keep it around as long as the connection lasts, |
3040 | * in case we need to start using it for a backchannel again; | |
3041 | * this reference won't be dropped until bc_xprt is destroyed. | |
99de8ea9 BF |
3042 | */ |
3043 | xprt_get(xprt); | |
3044 | args->bc_xprt->xpt_bc_xprt = xprt; | |
3045 | xprt->bc_xprt = args->bc_xprt; | |
3046 | bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); | |
3047 | transport->sock = bc_sock->sk_sock; | |
3048 | transport->inet = bc_sock->sk_sk; | |
3049 | ||
f300baba AB |
3050 | /* |
3051 | * Since we don't want connections for the backchannel, we set | |
3052 | * the xprt status to connected | |
3053 | */ | |
3054 | xprt_set_connected(xprt); | |
3055 | ||
f300baba AB |
3056 | if (try_module_get(THIS_MODULE)) |
3057 | return xprt; | |
642aab58 KM |
3058 | |
3059 | args->bc_xprt->xpt_bc_xprt = NULL; | |
39a9beab | 3060 | args->bc_xprt->xpt_bc_xps = NULL; |
99de8ea9 | 3061 | xprt_put(xprt); |
0a68b0be BF |
3062 | ret = ERR_PTR(-EINVAL); |
3063 | out_err: | |
315f3812 | 3064 | xs_xprt_free(xprt); |
0a68b0be | 3065 | return ret; |
f300baba AB |
3066 | } |
3067 | ||
176e21ee CL |
3068 | static struct xprt_class xs_local_transport = { |
3069 | .list = LIST_HEAD_INIT(xs_local_transport.list), | |
3070 | .name = "named UNIX socket", | |
3071 | .owner = THIS_MODULE, | |
3072 | .ident = XPRT_TRANSPORT_LOCAL, | |
3073 | .setup = xs_setup_local, | |
3074 | }; | |
3075 | ||
bc25571e TT |
3076 | static struct xprt_class xs_udp_transport = { |
3077 | .list = LIST_HEAD_INIT(xs_udp_transport.list), | |
3078 | .name = "udp", | |
3079 | .owner = THIS_MODULE, | |
f300baba | 3080 | .ident = XPRT_TRANSPORT_UDP, |
bc25571e TT |
3081 | .setup = xs_setup_udp, |
3082 | }; | |
3083 | ||
3084 | static struct xprt_class xs_tcp_transport = { | |
3085 | .list = LIST_HEAD_INIT(xs_tcp_transport.list), | |
3086 | .name = "tcp", | |
3087 | .owner = THIS_MODULE, | |
f300baba | 3088 | .ident = XPRT_TRANSPORT_TCP, |
bc25571e TT |
3089 | .setup = xs_setup_tcp, |
3090 | }; | |
3091 | ||
f300baba AB |
3092 | static struct xprt_class xs_bc_tcp_transport = { |
3093 | .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), | |
3094 | .name = "tcp NFSv4.1 backchannel", | |
3095 | .owner = THIS_MODULE, | |
3096 | .ident = XPRT_TRANSPORT_BC_TCP, | |
3097 | .setup = xs_setup_bc_tcp, | |
3098 | }; | |
3099 | ||
282b32e1 | 3100 | /** |
bc25571e | 3101 | * init_socket_xprt - set up xprtsock's sysctls, register with RPC client |
282b32e1 CL |
3102 | * |
3103 | */ | |
3104 | int init_socket_xprt(void) | |
3105 | { | |
f895b252 | 3106 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
2b1bec5f | 3107 | if (!sunrpc_table_header) |
0b4d4147 | 3108 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
3109 | #endif |
3110 | ||
176e21ee | 3111 | xprt_register_transport(&xs_local_transport); |
bc25571e TT |
3112 | xprt_register_transport(&xs_udp_transport); |
3113 | xprt_register_transport(&xs_tcp_transport); | |
f300baba | 3114 | xprt_register_transport(&xs_bc_tcp_transport); |
bc25571e | 3115 | |
282b32e1 CL |
3116 | return 0; |
3117 | } | |
3118 | ||
3119 | /** | |
bc25571e | 3120 | * cleanup_socket_xprt - remove xprtsock's sysctls, unregister |
282b32e1 CL |
3121 | * |
3122 | */ | |
3123 | void cleanup_socket_xprt(void) | |
3124 | { | |
f895b252 | 3125 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
fbf76683 CL |
3126 | if (sunrpc_table_header) { |
3127 | unregister_sysctl_table(sunrpc_table_header); | |
3128 | sunrpc_table_header = NULL; | |
3129 | } | |
3130 | #endif | |
bc25571e | 3131 | |
176e21ee | 3132 | xprt_unregister_transport(&xs_local_transport); |
bc25571e TT |
3133 | xprt_unregister_transport(&xs_udp_transport); |
3134 | xprt_unregister_transport(&xs_tcp_transport); | |
f300baba | 3135 | xprt_unregister_transport(&xs_bc_tcp_transport); |
282b32e1 | 3136 | } |
cbf11071 | 3137 | |
9bbb9e5a RR |
3138 | static int param_set_uint_minmax(const char *val, |
3139 | const struct kernel_param *kp, | |
cbf11071 TM |
3140 | unsigned int min, unsigned int max) |
3141 | { | |
00cfaa94 | 3142 | unsigned int num; |
cbf11071 TM |
3143 | int ret; |
3144 | ||
3145 | if (!val) | |
3146 | return -EINVAL; | |
00cfaa94 | 3147 | ret = kstrtouint(val, 0, &num); |
cbf11071 TM |
3148 | if (ret == -EINVAL || num < min || num > max) |
3149 | return -EINVAL; | |
3150 | *((unsigned int *)kp->arg) = num; | |
3151 | return 0; | |
3152 | } | |
3153 | ||
9bbb9e5a | 3154 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
cbf11071 TM |
3155 | { |
3156 | return param_set_uint_minmax(val, kp, | |
3157 | RPC_MIN_RESVPORT, | |
3158 | RPC_MAX_RESVPORT); | |
3159 | } | |
3160 | ||
9c27847d | 3161 | static const struct kernel_param_ops param_ops_portnr = { |
9bbb9e5a RR |
3162 | .set = param_set_portnr, |
3163 | .get = param_get_uint, | |
3164 | }; | |
3165 | ||
cbf11071 TM |
3166 | #define param_check_portnr(name, p) \ |
3167 | __param_check(name, p, unsigned int); | |
3168 | ||
3169 | module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); | |
3170 | module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); | |
3171 | ||
9bbb9e5a RR |
3172 | static int param_set_slot_table_size(const char *val, |
3173 | const struct kernel_param *kp) | |
cbf11071 TM |
3174 | { |
3175 | return param_set_uint_minmax(val, kp, | |
3176 | RPC_MIN_SLOT_TABLE, | |
3177 | RPC_MAX_SLOT_TABLE); | |
3178 | } | |
3179 | ||
9c27847d | 3180 | static const struct kernel_param_ops param_ops_slot_table_size = { |
9bbb9e5a RR |
3181 | .set = param_set_slot_table_size, |
3182 | .get = param_get_uint, | |
3183 | }; | |
3184 | ||
cbf11071 TM |
3185 | #define param_check_slot_table_size(name, p) \ |
3186 | __param_check(name, p, unsigned int); | |
3187 | ||
d9ba131d TM |
3188 | static int param_set_max_slot_table_size(const char *val, |
3189 | const struct kernel_param *kp) | |
3190 | { | |
3191 | return param_set_uint_minmax(val, kp, | |
3192 | RPC_MIN_SLOT_TABLE, | |
3193 | RPC_MAX_SLOT_TABLE_LIMIT); | |
3194 | } | |
3195 | ||
9c27847d | 3196 | static const struct kernel_param_ops param_ops_max_slot_table_size = { |
d9ba131d TM |
3197 | .set = param_set_max_slot_table_size, |
3198 | .get = param_get_uint, | |
3199 | }; | |
3200 | ||
3201 | #define param_check_max_slot_table_size(name, p) \ | |
3202 | __param_check(name, p, unsigned int); | |
3203 | ||
cbf11071 TM |
3204 | module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, |
3205 | slot_table_size, 0644); | |
d9ba131d TM |
3206 | module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, |
3207 | max_slot_table_size, 0644); | |
cbf11071 TM |
3208 | module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, |
3209 | slot_table_size, 0644); | |
3210 |