Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/net/sunrpc/svcsock.c | |
4 | * | |
5 | * These are the RPC server socket internals. | |
6 | * | |
7 | * The server scheduling algorithm does not always distribute the load | |
8 | * evenly when servicing a single client. May need to modify the | |
f6150c3c | 9 | * svc_xprt_enqueue procedure... |
1da177e4 LT |
10 | * |
11 | * TCP support is largely untested and may be a little slow. The problem | |
12 | * is that we currently do two separate recvfrom's, one for the 4-byte | |
13 | * record length, and the second for the actual record. This could possibly | |
14 | * be improved by always reading a minimum size of around 100 bytes and | |
15 | * tucking any superfluous bytes away in a temporary store. Still, that | |
16 | * leaves write requests out in the rain. An alternative may be to peek at | |
17 | * the first skb in the queue, and if it matches the next TCP sequence | |
18 | * number, to extract the record marker. Yuck. | |
19 | * | |
20 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
21 | */ | |
22 | ||
172589cc | 23 | #include <linux/kernel.h> |
1da177e4 | 24 | #include <linux/sched.h> |
3a9a231d | 25 | #include <linux/module.h> |
1da177e4 LT |
26 | #include <linux/errno.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/inet.h> | |
31 | #include <linux/udp.h> | |
91483c4b | 32 | #include <linux/tcp.h> |
1da177e4 LT |
33 | #include <linux/unistd.h> |
34 | #include <linux/slab.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/skbuff.h> | |
b41b66d6 | 37 | #include <linux/file.h> |
7dfb7103 | 38 | #include <linux/freezer.h> |
1da177e4 LT |
39 | #include <net/sock.h> |
40 | #include <net/checksum.h> | |
41 | #include <net/ip.h> | |
b92503b2 | 42 | #include <net/ipv6.h> |
850cbadd | 43 | #include <net/udp.h> |
b7872fe8 | 44 | #include <net/tcp.h> |
c752f073 | 45 | #include <net/tcp_states.h> |
5e052dda | 46 | #include <net/tls.h> |
b3cbf98e | 47 | #include <net/handshake.h> |
7c0f6ba6 | 48 | #include <linux/uaccess.h> |
becd2014 | 49 | #include <linux/highmem.h> |
1da177e4 | 50 | #include <asm/ioctls.h> |
b3cbf98e | 51 | #include <linux/key.h> |
1da177e4 LT |
52 | |
53 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 54 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 55 | #include <linux/sunrpc/xdr.h> |
c0401ea0 | 56 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 LT |
57 | #include <linux/sunrpc/svcsock.h> |
58 | #include <linux/sunrpc/stats.h> | |
4cfc7e60 | 59 | #include <linux/sunrpc/xprt.h> |
1da177e4 | 60 | |
40e0b090 | 61 | #include <trace/events/sock.h> |
998024de CL |
62 | #include <trace/events/sunrpc.h> |
63 | ||
9e55eef4 | 64 | #include "socklib.h" |
177e4f99 HS |
65 | #include "sunrpc.h" |
66 | ||
360d8738 | 67 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 | 68 | |
b3cbf98e CL |
69 | /* To-do: to avoid tying up an nfsd thread while waiting for a |
70 | * handshake request, the request could instead be deferred. | |
71 | */ | |
72 | enum { | |
73 | SVC_HANDSHAKE_TO = 5U * HZ | |
74 | }; | |
1da177e4 LT |
75 | |
76 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
72c35376 | 77 | int flags); |
1da177e4 LT |
78 | static int svc_udp_recvfrom(struct svc_rqst *); |
79 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 80 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 81 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 82 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 83 | |
b700cbb1 | 84 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
62832c03 PE |
85 | struct net *, struct sockaddr *, |
86 | int, int); | |
ed07536e PZ |
87 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
88 | static struct lock_class_key svc_key[2]; | |
89 | static struct lock_class_key svc_slock_key[2]; | |
90 | ||
0f0257ea | 91 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
92 | { |
93 | struct sock *sk = sock->sk; | |
1b7a1819 | 94 | |
fafc4e1e | 95 | if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) |
1b7a1819 WAA |
96 | return; |
97 | ||
ed07536e PZ |
98 | switch (sk->sk_family) { |
99 | case AF_INET: | |
100 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
101 | &svc_slock_key[0], |
102 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
103 | &svc_key[0]); | |
ed07536e PZ |
104 | break; |
105 | ||
106 | case AF_INET6: | |
107 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
108 | &svc_slock_key[1], |
109 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
110 | &svc_key[1]); | |
ed07536e PZ |
111 | break; |
112 | ||
113 | default: | |
114 | BUG(); | |
115 | } | |
116 | } | |
117 | #else | |
0f0257ea | 118 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
119 | { |
120 | } | |
121 | #endif | |
122 | ||
cca557a5 | 123 | /** |
948f072a N |
124 | * svc_tcp_release_ctxt - Release transport-related resources |
125 | * @xprt: the transport which owned the context | |
126 | * @ctxt: the context from rqstp->rq_xprt_ctxt or dr->xprt_ctxt | |
cca557a5 | 127 | * |
1da177e4 | 128 | */ |
948f072a | 129 | static void svc_tcp_release_ctxt(struct svc_xprt *xprt, void *ctxt) |
1da177e4 | 130 | { |
1da177e4 LT |
131 | } |
132 | ||
cca557a5 | 133 | /** |
948f072a N |
134 | * svc_udp_release_ctxt - Release transport-related resources |
135 | * @xprt: the transport which owned the context | |
136 | * @ctxt: the context from rqstp->rq_xprt_ctxt or dr->xprt_ctxt | |
cca557a5 CL |
137 | * |
138 | */ | |
948f072a | 139 | static void svc_udp_release_ctxt(struct svc_xprt *xprt, void *ctxt) |
850cbadd | 140 | { |
948f072a | 141 | struct sk_buff *skb = ctxt; |
850cbadd | 142 | |
948f072a | 143 | if (skb) |
850cbadd | 144 | consume_skb(skb); |
850cbadd PA |
145 | } |
146 | ||
b92503b2 CL |
147 | union svc_pktinfo_u { |
148 | struct in_pktinfo pkti; | |
b92503b2 | 149 | struct in6_pktinfo pkti6; |
b92503b2 | 150 | }; |
bc375ea7 DM |
151 | #define SVC_PKTINFO_SPACE \ |
152 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
153 | |
154 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
155 | { | |
57b1d3ba TT |
156 | struct svc_sock *svsk = |
157 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
158 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
159 | case AF_INET: { |
160 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
161 | ||
162 | cmh->cmsg_level = SOL_IP; | |
163 | cmh->cmsg_type = IP_PKTINFO; | |
164 | pki->ipi_ifindex = 0; | |
849a1cf1 MJ |
165 | pki->ipi_spec_dst.s_addr = |
166 | svc_daddr_in(rqstp)->sin_addr.s_addr; | |
b92503b2 CL |
167 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
168 | } | |
169 | break; | |
5a05ed73 | 170 | |
b92503b2 CL |
171 | case AF_INET6: { |
172 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 | 173 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
b92503b2 CL |
174 | |
175 | cmh->cmsg_level = SOL_IPV6; | |
176 | cmh->cmsg_type = IPV6_PKTINFO; | |
849a1cf1 | 177 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
4e3fd7a0 | 178 | pki->ipi6_addr = daddr->sin6_addr; |
b92503b2 CL |
179 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
180 | } | |
181 | break; | |
b92503b2 | 182 | } |
b92503b2 CL |
183 | } |
184 | ||
03493bca CL |
185 | static int svc_sock_result_payload(struct svc_rqst *rqstp, unsigned int offset, |
186 | unsigned int length) | |
41205539 CL |
187 | { |
188 | return 0; | |
189 | } | |
190 | ||
80212d59 N |
191 | /* |
192 | * Report socket names for nfsdfs | |
193 | */ | |
e7942b9f | 194 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 195 | { |
017cb47f CL |
196 | const struct sock *sk = svsk->sk_sk; |
197 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
198 | "udp" : "tcp"; | |
80212d59 N |
199 | int len; |
200 | ||
017cb47f | 201 | switch (sk->sk_family) { |
e7942b9f CL |
202 | case PF_INET: |
203 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 204 | proto_name, |
c720c7e8 ED |
205 | &inet_sk(sk)->inet_rcv_saddr, |
206 | inet_sk(sk)->inet_num); | |
80212d59 | 207 | break; |
c2bb06db | 208 | #if IS_ENABLED(CONFIG_IPV6) |
58de2f86 CL |
209 | case PF_INET6: |
210 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f | 211 | proto_name, |
efe4208f | 212 | &sk->sk_v6_rcv_saddr, |
c720c7e8 | 213 | inet_sk(sk)->inet_num); |
80212d59 | 214 | break; |
c2bb06db | 215 | #endif |
80212d59 | 216 | default: |
e7942b9f | 217 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 218 | sk->sk_family); |
80212d59 | 219 | } |
e7942b9f CL |
220 | |
221 | if (len >= remaining) { | |
222 | *buf = '\0'; | |
223 | return -ENAMETOOLONG; | |
80212d59 N |
224 | } |
225 | return len; | |
226 | } | |
227 | ||
5e052dda CL |
228 | static int |
229 | svc_tcp_sock_process_cmsg(struct svc_sock *svsk, struct msghdr *msg, | |
230 | struct cmsghdr *cmsg, int ret) | |
231 | { | |
232 | if (cmsg->cmsg_level == SOL_TLS && | |
233 | cmsg->cmsg_type == TLS_GET_RECORD_TYPE) { | |
234 | u8 content_type = *((u8 *)CMSG_DATA(cmsg)); | |
235 | ||
236 | switch (content_type) { | |
237 | case TLS_RECORD_TYPE_DATA: | |
238 | /* TLS sets EOR at the end of each application data | |
239 | * record, even though there might be more frames | |
240 | * waiting to be decrypted. | |
241 | */ | |
242 | msg->msg_flags &= ~MSG_EOR; | |
243 | break; | |
244 | case TLS_RECORD_TYPE_ALERT: | |
245 | ret = -ENOTCONN; | |
246 | break; | |
247 | default: | |
248 | ret = -EAGAIN; | |
249 | } | |
250 | } | |
251 | return ret; | |
252 | } | |
253 | ||
254 | static int | |
255 | svc_tcp_sock_recv_cmsg(struct svc_sock *svsk, struct msghdr *msg) | |
256 | { | |
257 | union { | |
258 | struct cmsghdr cmsg; | |
259 | u8 buf[CMSG_SPACE(sizeof(u8))]; | |
260 | } u; | |
261 | int ret; | |
262 | ||
263 | msg->msg_control = &u; | |
264 | msg->msg_controllen = sizeof(u); | |
265 | ret = sock_recvmsg(svsk->sk_sock, msg, MSG_DONTWAIT); | |
266 | if (unlikely(msg->msg_controllen != sizeof(u))) | |
267 | ret = svc_tcp_sock_process_cmsg(svsk, msg, &u.cmsg, ret); | |
268 | return ret; | |
269 | } | |
270 | ||
ca07eda3 CL |
271 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
272 | static void svc_flush_bvec(const struct bio_vec *bvec, size_t size, size_t seek) | |
273 | { | |
274 | struct bvec_iter bi = { | |
13a9a9d7 | 275 | .bi_size = size + seek, |
ca07eda3 CL |
276 | }; |
277 | struct bio_vec bv; | |
278 | ||
279 | bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); | |
280 | for_each_bvec(bv, bvec, bi, bi) | |
281 | flush_dcache_page(bv.bv_page); | |
282 | } | |
283 | #else | |
284 | static inline void svc_flush_bvec(const struct bio_vec *bvec, size_t size, | |
285 | size_t seek) | |
286 | { | |
287 | } | |
288 | #endif | |
289 | ||
1da177e4 | 290 | /* |
ca07eda3 CL |
291 | * Read from @rqstp's transport socket. The incoming message fills whole |
292 | * pages in @rqstp's rq_pages array until the last page of the message | |
293 | * has been received into a partial page. | |
1da177e4 | 294 | */ |
ca07eda3 CL |
295 | static ssize_t svc_tcp_read_msg(struct svc_rqst *rqstp, size_t buflen, |
296 | size_t seek) | |
1da177e4 | 297 | { |
57b1d3ba TT |
298 | struct svc_sock *svsk = |
299 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
ca07eda3 | 300 | struct bio_vec *bvec = rqstp->rq_bvec; |
4c8e5537 | 301 | struct msghdr msg = { NULL }; |
ca07eda3 | 302 | unsigned int i; |
4c8e5537 | 303 | ssize_t len; |
ca07eda3 | 304 | size_t t; |
1da177e4 | 305 | |
f8d1ff47 | 306 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
ca07eda3 | 307 | |
9088151f CH |
308 | for (i = 0, t = 0; t < buflen; i++, t += PAGE_SIZE) |
309 | bvec_set_page(&bvec[i], rqstp->rq_pages[i], PAGE_SIZE, 0); | |
ca07eda3 CL |
310 | rqstp->rq_respages = &rqstp->rq_pages[i]; |
311 | rqstp->rq_next_page = rqstp->rq_respages + 1; | |
312 | ||
de4eda9d | 313 | iov_iter_bvec(&msg.msg_iter, ITER_DEST, bvec, i, buflen); |
ca07eda3 CL |
314 | if (seek) { |
315 | iov_iter_advance(&msg.msg_iter, seek); | |
316 | buflen -= seek; | |
4c8e5537 | 317 | } |
5e052dda | 318 | len = svc_tcp_sock_recv_cmsg(svsk, &msg); |
ca07eda3 CL |
319 | if (len > 0) |
320 | svc_flush_bvec(bvec, len, seek); | |
321 | ||
f8d1ff47 TM |
322 | /* If we read a full record, then assume there may be more |
323 | * data to read (stream based sockets only!) | |
324 | */ | |
325 | if (len == buflen) | |
326 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1da177e4 | 327 | |
1da177e4 LT |
328 | return len; |
329 | } | |
330 | ||
331 | /* | |
332 | * Set socket snd and rcv buffer lengths | |
333 | */ | |
b7e5034c | 334 | static void svc_sock_setbufsize(struct svc_sock *svsk, unsigned int nreqs) |
1da177e4 | 335 | { |
b7e5034c BF |
336 | unsigned int max_mesg = svsk->sk_xprt.xpt_server->sv_max_mesg; |
337 | struct socket *sock = svsk->sk_sock; | |
338 | ||
339 | nreqs = min(nreqs, INT_MAX / 2 / max_mesg); | |
340 | ||
1da177e4 | 341 | lock_sock(sock->sk); |
b7e5034c BF |
342 | sock->sk->sk_sndbuf = nreqs * max_mesg * 2; |
343 | sock->sk->sk_rcvbuf = nreqs * max_mesg * 2; | |
47fcb03f | 344 | sock->sk->sk_write_space(sock->sk); |
1da177e4 | 345 | release_sock(sock->sk); |
1da177e4 | 346 | } |
16e4d93f | 347 | |
989f881e | 348 | static void svc_sock_secure_port(struct svc_rqst *rqstp) |
16e4d93f | 349 | { |
989f881e | 350 | if (svc_port_is_privileged(svc_addr(rqstp))) |
7827c81f | 351 | set_bit(RQ_SECURE, &rqstp->rq_flags); |
989f881e | 352 | else |
7827c81f | 353 | clear_bit(RQ_SECURE, &rqstp->rq_flags); |
16e4d93f CL |
354 | } |
355 | ||
1da177e4 LT |
356 | /* |
357 | * INET callback when data has been received on the socket. | |
358 | */ | |
fa9251af | 359 | static void svc_data_ready(struct sock *sk) |
1da177e4 | 360 | { |
939bb7ef | 361 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 362 | |
40e0b090 PY |
363 | trace_sk_data_ready(sk); |
364 | ||
939bb7ef | 365 | if (svsk) { |
eebe53e8 VL |
366 | /* Refer to svc_setup_socket() for details. */ |
367 | rmb(); | |
fa9251af | 368 | svsk->sk_odata(sk); |
998024de | 369 | trace_svcsock_data_ready(&svsk->sk_xprt, 0); |
b3cbf98e CL |
370 | if (test_bit(XPT_HANDSHAKE, &svsk->sk_xprt.xpt_flags)) |
371 | return; | |
4720b070 TM |
372 | if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) |
373 | svc_xprt_enqueue(&svsk->sk_xprt); | |
939bb7ef | 374 | } |
1da177e4 LT |
375 | } |
376 | ||
377 | /* | |
378 | * INET callback when space is newly available on the socket. | |
379 | */ | |
0f0257ea | 380 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
381 | { |
382 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
383 | ||
384 | if (svsk) { | |
eebe53e8 VL |
385 | /* Refer to svc_setup_socket() for details. */ |
386 | rmb(); | |
998024de | 387 | trace_svcsock_write_space(&svsk->sk_xprt, 0); |
fa9251af | 388 | svsk->sk_owspace(sk); |
f6150c3c | 389 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 390 | } |
1da177e4 LT |
391 | } |
392 | ||
c7fb3f06 TM |
393 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
394 | { | |
637600f3 | 395 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
c7fb3f06 TM |
396 | |
397 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
398 | return 1; | |
637600f3 | 399 | return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
51877680 TM |
400 | } |
401 | ||
ea08e392 SM |
402 | static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt) |
403 | { | |
c433594c CH |
404 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
405 | ||
406 | sock_no_linger(svsk->sk_sock->sk); | |
ea08e392 SM |
407 | } |
408 | ||
b3cbf98e CL |
409 | /** |
410 | * svc_tcp_handshake_done - Handshake completion handler | |
411 | * @data: address of xprt to wake | |
412 | * @status: status of handshake | |
413 | * @peerid: serial number of key containing the remote peer's identity | |
414 | * | |
415 | * If a security policy is specified as an export option, we don't | |
416 | * have a specific export here to check. So we set a "TLS session | |
417 | * is present" flag on the xprt and let an upper layer enforce local | |
418 | * security policy. | |
419 | */ | |
420 | static void svc_tcp_handshake_done(void *data, int status, key_serial_t peerid) | |
421 | { | |
422 | struct svc_xprt *xprt = data; | |
423 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
424 | ||
425 | if (!status) { | |
426 | if (peerid != TLS_NO_PEERID) | |
427 | set_bit(XPT_PEER_AUTH, &xprt->xpt_flags); | |
428 | set_bit(XPT_TLS_SESSION, &xprt->xpt_flags); | |
429 | } | |
430 | clear_bit(XPT_HANDSHAKE, &xprt->xpt_flags); | |
431 | complete_all(&svsk->sk_handshake_done); | |
432 | } | |
433 | ||
434 | /** | |
435 | * svc_tcp_handshake - Perform a transport-layer security handshake | |
436 | * @xprt: connected transport endpoint | |
437 | * | |
438 | */ | |
439 | static void svc_tcp_handshake(struct svc_xprt *xprt) | |
440 | { | |
441 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
442 | struct sock *sk = svsk->sk_sock->sk; | |
443 | struct tls_handshake_args args = { | |
444 | .ta_sock = svsk->sk_sock, | |
445 | .ta_done = svc_tcp_handshake_done, | |
446 | .ta_data = xprt, | |
447 | }; | |
448 | int ret; | |
449 | ||
450 | trace_svc_tls_upcall(xprt); | |
451 | ||
452 | clear_bit(XPT_TLS_SESSION, &xprt->xpt_flags); | |
453 | init_completion(&svsk->sk_handshake_done); | |
454 | ||
455 | ret = tls_server_hello_x509(&args, GFP_KERNEL); | |
456 | if (ret) { | |
457 | trace_svc_tls_not_started(xprt); | |
458 | goto out_failed; | |
459 | } | |
460 | ||
461 | ret = wait_for_completion_interruptible_timeout(&svsk->sk_handshake_done, | |
462 | SVC_HANDSHAKE_TO); | |
463 | if (ret <= 0) { | |
464 | if (tls_handshake_cancel(sk)) { | |
465 | trace_svc_tls_timed_out(xprt); | |
466 | goto out_close; | |
467 | } | |
468 | } | |
469 | ||
470 | if (!test_bit(XPT_TLS_SESSION, &xprt->xpt_flags)) { | |
471 | trace_svc_tls_unavailable(xprt); | |
472 | goto out_close; | |
473 | } | |
474 | ||
475 | /* Mark the transport ready in case the remote sent RPC | |
476 | * traffic before the kernel received the handshake | |
477 | * completion downcall. | |
478 | */ | |
479 | set_bit(XPT_DATA, &xprt->xpt_flags); | |
480 | svc_xprt_enqueue(xprt); | |
481 | return; | |
482 | ||
483 | out_close: | |
484 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
485 | out_failed: | |
486 | clear_bit(XPT_HANDSHAKE, &xprt->xpt_flags); | |
487 | set_bit(XPT_DATA, &xprt->xpt_flags); | |
488 | svc_xprt_enqueue(xprt); | |
489 | } | |
490 | ||
7702ce40 CL |
491 | /* |
492 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
493 | */ | |
494 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
495 | struct cmsghdr *cmh) | |
496 | { | |
497 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
498 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
499 | ||
7702ce40 CL |
500 | if (cmh->cmsg_type != IP_PKTINFO) |
501 | return 0; | |
849a1cf1 MJ |
502 | |
503 | daddr->sin_family = AF_INET; | |
504 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
505 | return 1; |
506 | } | |
507 | ||
508 | /* | |
73df66f8 | 509 | * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
7702ce40 CL |
510 | */ |
511 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
512 | struct cmsghdr *cmh) | |
513 | { | |
514 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
515 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
516 | ||
7702ce40 CL |
517 | if (cmh->cmsg_type != IPV6_PKTINFO) |
518 | return 0; | |
849a1cf1 MJ |
519 | |
520 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 521 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 522 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
523 | return 1; |
524 | } | |
525 | ||
9dbc240f TT |
526 | /* |
527 | * Copy the UDP datagram's destination address to the rqstp structure. | |
528 | * The 'destination' address in this case is the address to which the | |
529 | * peer sent the datagram, i.e. our local address. For multihomed | |
530 | * hosts, this can change from msg to msg. Note that only the IP | |
531 | * address changes, the port number should remain the same. | |
532 | */ | |
7702ce40 CL |
533 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
534 | struct cmsghdr *cmh) | |
95756482 | 535 | { |
7702ce40 CL |
536 | switch (cmh->cmsg_level) { |
537 | case SOL_IP: | |
538 | return svc_udp_get_dest_address4(rqstp, cmh); | |
539 | case SOL_IPV6: | |
540 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 541 | } |
7702ce40 CL |
542 | |
543 | return 0; | |
95756482 CL |
544 | } |
545 | ||
fff1ebb2 CL |
546 | /** |
547 | * svc_udp_recvfrom - Receive a datagram from a UDP socket. | |
548 | * @rqstp: request structure into which to receive an RPC Call | |
549 | * | |
550 | * Called in a loop when XPT_DATA has been set. | |
551 | * | |
552 | * Returns: | |
553 | * On success, the number of bytes in a received RPC Call, or | |
554 | * %0 if a complete RPC Call message was not ready to return | |
1da177e4 | 555 | */ |
0f0257ea | 556 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 557 | { |
57b1d3ba TT |
558 | struct svc_sock *svsk = |
559 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 560 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 561 | struct sk_buff *skb; |
bc375ea7 DM |
562 | union { |
563 | struct cmsghdr hdr; | |
564 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
565 | } buffer; | |
566 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
567 | struct msghdr msg = { |
568 | .msg_name = svc_addr(rqstp), | |
569 | .msg_control = cmh, | |
570 | .msg_controllen = sizeof(buffer), | |
571 | .msg_flags = MSG_DONTWAIT, | |
572 | }; | |
abc5c44d CL |
573 | size_t len; |
574 | int err; | |
1da177e4 | 575 | |
02fc6c36 | 576 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
577 | /* udp sockets need large rcvbuf as all pending |
578 | * requests are still in that buffer. sndbuf must | |
579 | * also be large enough that there is enough space | |
3262c816 GB |
580 | * for one reply per thread. We count all threads |
581 | * rather than threads in a particular pool, which | |
582 | * provides an upper bound on the number of threads | |
583 | * which will access the socket. | |
1da177e4 | 584 | */ |
b7e5034c | 585 | svc_sock_setbufsize(svsk, serv->sv_nrthreads + 3); |
1da177e4 | 586 | |
02fc6c36 | 587 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
588 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, |
589 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
fff1ebb2 CL |
590 | if (err < 0) |
591 | goto out_recv_err; | |
ec095263 | 592 | skb = skb_recv_udp(svsk->sk_sk, MSG_DONTWAIT, &err); |
fff1ebb2 CL |
593 | if (!skb) |
594 | goto out_recv_err; | |
595 | ||
9dbc240f | 596 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 597 | rqstp->rq_addrlen = len; |
2456e855 | 598 | if (skb->tstamp == 0) { |
b7aa0bf7 | 599 | skb->tstamp = ktime_get_real(); |
cca5172a | 600 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
601 | need that much accuracy */ |
602 | } | |
3a0ed3e9 | 603 | sock_write_timestamp(svsk->sk_sk, skb->tstamp); |
02fc6c36 | 604 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 605 | |
fff1ebb2 | 606 | len = skb->len; |
1da177e4 | 607 | rqstp->rq_arg.len = len; |
fff1ebb2 | 608 | trace_svcsock_udp_recv(&svsk->sk_xprt, len); |
1da177e4 | 609 | |
95756482 | 610 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 611 | |
fff1ebb2 CL |
612 | if (!svc_udp_get_dest_address(rqstp, cmh)) |
613 | goto out_cmsg_err; | |
849a1cf1 | 614 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
615 | |
616 | if (skb_is_nonlinear(skb)) { | |
617 | /* we have to copy */ | |
618 | local_bh_disable(); | |
fff1ebb2 CL |
619 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) |
620 | goto out_bh_enable; | |
1da177e4 | 621 | local_bh_enable(); |
850cbadd | 622 | consume_skb(skb); |
1da177e4 LT |
623 | } else { |
624 | /* we can use it in-place */ | |
1da8c681 | 625 | rqstp->rq_arg.head[0].iov_base = skb->data; |
1da177e4 | 626 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
627 | if (skb_checksum_complete(skb)) |
628 | goto out_free; | |
5148bf4e | 629 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
630 | } |
631 | ||
632 | rqstp->rq_arg.page_base = 0; | |
633 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
634 | rqstp->rq_arg.head[0].iov_len = len; | |
635 | rqstp->rq_arg.page_len = 0; | |
44524359 | 636 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
637 | } else { |
638 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 639 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 640 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 | 641 | } |
afc59400 | 642 | rqstp->rq_next_page = rqstp->rq_respages+1; |
1da177e4 LT |
643 | |
644 | if (serv->sv_stats) | |
645 | serv->sv_stats->netudpcnt++; | |
646 | ||
319951eb | 647 | svc_sock_secure_port(rqstp); |
82011c80 | 648 | svc_xprt_received(rqstp->rq_xprt); |
1da177e4 | 649 | return len; |
fff1ebb2 CL |
650 | |
651 | out_recv_err: | |
652 | if (err != -EAGAIN) { | |
653 | /* possibly an icmp error */ | |
654 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
655 | } | |
656 | trace_svcsock_udp_recv_err(&svsk->sk_xprt, err); | |
82011c80 | 657 | goto out_clear_busy; |
fff1ebb2 CL |
658 | out_cmsg_err: |
659 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", | |
660 | cmh->cmsg_level, cmh->cmsg_type); | |
661 | goto out_free; | |
662 | out_bh_enable: | |
663 | local_bh_enable(); | |
f23abfdb | 664 | out_free: |
850cbadd | 665 | kfree_skb(skb); |
82011c80 CL |
666 | out_clear_busy: |
667 | svc_xprt_received(rqstp->rq_xprt); | |
f23abfdb | 668 | return 0; |
1da177e4 LT |
669 | } |
670 | ||
da1661b9 CL |
671 | /** |
672 | * svc_udp_sendto - Send out a reply on a UDP socket | |
673 | * @rqstp: completed svc_rqst | |
674 | * | |
ca4faf54 CL |
675 | * xpt_mutex ensures @rqstp's whole message is written to the socket |
676 | * without interruption. | |
677 | * | |
da1661b9 CL |
678 | * Returns the number of bytes sent, or a negative errno. |
679 | */ | |
680 | static int svc_udp_sendto(struct svc_rqst *rqstp) | |
1da177e4 | 681 | { |
da1661b9 CL |
682 | struct svc_xprt *xprt = rqstp->rq_xprt; |
683 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
684 | struct xdr_buf *xdr = &rqstp->rq_res; | |
685 | union { | |
686 | struct cmsghdr hdr; | |
687 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
688 | } buffer; | |
689 | struct cmsghdr *cmh = &buffer.hdr; | |
690 | struct msghdr msg = { | |
691 | .msg_name = &rqstp->rq_addr, | |
692 | .msg_namelen = rqstp->rq_addrlen, | |
693 | .msg_control = cmh, | |
694 | .msg_controllen = sizeof(buffer), | |
695 | }; | |
3f649ab7 | 696 | unsigned int sent; |
da1661b9 | 697 | int err; |
1da177e4 | 698 | |
948f072a N |
699 | svc_udp_release_ctxt(xprt, rqstp->rq_xprt_ctxt); |
700 | rqstp->rq_xprt_ctxt = NULL; | |
23cf1ee1 | 701 | |
da1661b9 | 702 | svc_set_cmsg_data(rqstp, cmh); |
1da177e4 | 703 | |
ca4faf54 CL |
704 | mutex_lock(&xprt->xpt_mutex); |
705 | ||
706 | if (svc_xprt_is_dead(xprt)) | |
707 | goto out_notconn; | |
708 | ||
ff053dbb TM |
709 | err = xdr_alloc_bvec(xdr, GFP_KERNEL); |
710 | if (err < 0) | |
711 | goto out_unlock; | |
712 | ||
da1661b9 | 713 | err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent); |
da1661b9 CL |
714 | if (err == -ECONNREFUSED) { |
715 | /* ICMP error on earlier request. */ | |
716 | err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent); | |
da1661b9 | 717 | } |
ff053dbb | 718 | xdr_free_bvec(xdr); |
998024de | 719 | trace_svcsock_udp_send(xprt, err); |
ff053dbb | 720 | out_unlock: |
ca4faf54 | 721 | mutex_unlock(&xprt->xpt_mutex); |
da1661b9 CL |
722 | if (err < 0) |
723 | return err; | |
724 | return sent; | |
ca4faf54 CL |
725 | |
726 | out_notconn: | |
727 | mutex_unlock(&xprt->xpt_mutex); | |
728 | return -ENOTCONN; | |
1da177e4 LT |
729 | } |
730 | ||
323bee32 TT |
731 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
732 | { | |
733 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 734 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
735 | unsigned long required; |
736 | ||
737 | /* | |
738 | * Set the SOCK_NOSPACE flag before checking the available | |
739 | * sock space. | |
740 | */ | |
741 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 742 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
743 | if (required*2 > sock_wspace(svsk->sk_sk)) |
744 | return 0; | |
745 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
746 | return 1; | |
747 | } | |
748 | ||
38a417cc TT |
749 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
750 | { | |
751 | BUG(); | |
752 | return NULL; | |
753 | } | |
754 | ||
ea08e392 SM |
755 | static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt) |
756 | { | |
757 | } | |
758 | ||
b700cbb1 | 759 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 760 | struct net *net, |
b700cbb1 TT |
761 | struct sockaddr *sa, int salen, |
762 | int flags) | |
763 | { | |
62832c03 | 764 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
765 | } |
766 | ||
2412e927 | 767 | static const struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 768 | .xpo_create = svc_udp_create, |
5d137990 TT |
769 | .xpo_recvfrom = svc_udp_recvfrom, |
770 | .xpo_sendto = svc_udp_sendto, | |
03493bca | 771 | .xpo_result_payload = svc_sock_result_payload, |
948f072a | 772 | .xpo_release_ctxt = svc_udp_release_ctxt, |
755cceab TT |
773 | .xpo_detach = svc_sock_detach, |
774 | .xpo_free = svc_sock_free, | |
323bee32 | 775 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 776 | .xpo_accept = svc_udp_accept, |
ea08e392 | 777 | .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt, |
360d8738 TT |
778 | }; |
779 | ||
780 | static struct svc_xprt_class svc_udp_class = { | |
781 | .xcl_name = "udp", | |
b700cbb1 | 782 | .xcl_owner = THIS_MODULE, |
360d8738 | 783 | .xcl_ops = &svc_udp_ops, |
49023155 | 784 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
3c45ddf8 | 785 | .xcl_ident = XPRT_TRANSPORT_UDP, |
360d8738 TT |
786 | }; |
787 | ||
bb5cf160 | 788 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 789 | { |
bd4620dd SK |
790 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
791 | &svsk->sk_xprt, serv); | |
def13d74 | 792 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
fa9251af | 793 | svsk->sk_sk->sk_data_ready = svc_data_ready; |
1da177e4 | 794 | svsk->sk_sk->sk_write_space = svc_write_space; |
1da177e4 LT |
795 | |
796 | /* initialise setting must have enough space to | |
cca5172a | 797 | * receive and respond to one request. |
1da177e4 LT |
798 | * svc_udp_recvfrom will re-adjust if necessary |
799 | */ | |
b7e5034c | 800 | svc_sock_setbufsize(svsk, 3); |
1da177e4 | 801 | |
0f0257ea TT |
802 | /* data might have come in before data_ready set up */ |
803 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 804 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 805 | |
7a37f578 | 806 | /* make sure we get destination address info */ |
7702ce40 CL |
807 | switch (svsk->sk_sk->sk_family) { |
808 | case AF_INET: | |
c1f9ec57 | 809 | ip_sock_set_pktinfo(svsk->sk_sock->sk); |
7d7207c2 | 810 | break; |
7702ce40 | 811 | case AF_INET6: |
7d7207c2 | 812 | ip6_sock_set_recvpktinfo(svsk->sk_sock->sk); |
7702ce40 CL |
813 | break; |
814 | default: | |
815 | BUG(); | |
816 | } | |
1da177e4 LT |
817 | } |
818 | ||
819 | /* | |
820 | * A data_ready event on a listening socket means there's a connection | |
821 | * pending. Do not use state_change as a substitute for it. | |
822 | */ | |
676d2369 | 823 | static void svc_tcp_listen_data_ready(struct sock *sk) |
1da177e4 | 824 | { |
939bb7ef | 825 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 826 | |
40e0b090 PY |
827 | trace_sk_data_ready(sk); |
828 | ||
eebe53e8 VL |
829 | if (svsk) { |
830 | /* Refer to svc_setup_socket() for details. */ | |
831 | rmb(); | |
fa9251af | 832 | svsk->sk_odata(sk); |
eebe53e8 VL |
833 | } |
834 | ||
939bb7ef NB |
835 | /* |
836 | * This callback may called twice when a new connection | |
837 | * is established as a child socket inherits everything | |
838 | * from a parent LISTEN socket. | |
839 | * 1) data_ready method of the parent socket will be called | |
840 | * when one of child sockets become ESTABLISHED. | |
841 | * 2) data_ready method of the child socket may be called | |
842 | * when it receives data before the socket is accepted. | |
843 | * In case of 2, we should ignore it silently. | |
844 | */ | |
845 | if (sk->sk_state == TCP_LISTEN) { | |
846 | if (svsk) { | |
02fc6c36 | 847 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 848 | svc_xprt_enqueue(&svsk->sk_xprt); |
a0469f46 | 849 | } |
1da177e4 | 850 | } |
1da177e4 LT |
851 | } |
852 | ||
853 | /* | |
854 | * A state change on a connected socket means it's dying or dead. | |
855 | */ | |
0f0257ea | 856 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 857 | { |
939bb7ef | 858 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 859 | |
a0469f46 | 860 | if (svsk) { |
eebe53e8 VL |
861 | /* Refer to svc_setup_socket() for details. */ |
862 | rmb(); | |
fa9251af | 863 | svsk->sk_ostate(sk); |
a0469f46 | 864 | trace_svcsock_tcp_state(&svsk->sk_xprt, svsk->sk_sock); |
e844d307 CL |
865 | if (sk->sk_state != TCP_ESTABLISHED) |
866 | svc_xprt_deferred_close(&svsk->sk_xprt); | |
1da177e4 | 867 | } |
1da177e4 LT |
868 | } |
869 | ||
870 | /* | |
871 | * Accept a TCP connection | |
872 | */ | |
38a417cc | 873 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 874 | { |
38a417cc | 875 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 876 | struct sockaddr_storage addr; |
877 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 878 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
879 | struct socket *sock = svsk->sk_sock; |
880 | struct socket *newsock; | |
1da177e4 LT |
881 | struct svc_sock *newsvsk; |
882 | int err, slen; | |
883 | ||
1da177e4 | 884 | if (!sock) |
38a417cc | 885 | return NULL; |
1da177e4 | 886 | |
02fc6c36 | 887 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
888 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
889 | if (err < 0) { | |
1da177e4 LT |
890 | if (err == -ENOMEM) |
891 | printk(KERN_WARNING "%s: no more sockets!\n", | |
892 | serv->sv_name); | |
e87cc472 JP |
893 | else if (err != -EAGAIN) |
894 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
895 | serv->sv_name, -err); | |
a0469f46 | 896 | trace_svcsock_accept_err(xprt, serv->sv_name, err); |
38a417cc | 897 | return NULL; |
1da177e4 | 898 | } |
319050d4 CL |
899 | if (IS_ERR(sock_alloc_file(newsock, O_NONBLOCK, NULL))) |
900 | return NULL; | |
901 | ||
02fc6c36 | 902 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 903 | |
9b2c45d4 | 904 | err = kernel_getpeername(newsock, sin); |
1da177e4 | 905 | if (err < 0) { |
a0469f46 | 906 | trace_svcsock_getpeername_err(xprt, serv->sv_name, err); |
1da177e4 LT |
907 | goto failed; /* aborted connection or whatever */ |
908 | } | |
9b2c45d4 | 909 | slen = err; |
1da177e4 | 910 | |
fa9251af TM |
911 | /* Reset the inherited callbacks before calling svc_setup_socket */ |
912 | newsock->sk->sk_state_change = svsk->sk_ostate; | |
913 | newsock->sk->sk_data_ready = svsk->sk_odata; | |
914 | newsock->sk->sk_write_space = svsk->sk_owspace; | |
915 | ||
1da177e4 LT |
916 | /* make sure that a write doesn't block forever when |
917 | * low on memory | |
918 | */ | |
919 | newsock->sk->sk_sndtimeo = HZ*30; | |
920 | ||
72c35376 BF |
921 | newsvsk = svc_setup_socket(serv, newsock, |
922 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
923 | if (IS_ERR(newsvsk)) | |
1da177e4 | 924 | goto failed; |
9dbc240f | 925 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
9b2c45d4 DV |
926 | err = kernel_getsockname(newsock, sin); |
927 | slen = err; | |
a0469f46 | 928 | if (unlikely(err < 0)) |
a9747692 | 929 | slen = offsetof(struct sockaddr, sa_data); |
9dbc240f | 930 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 931 | |
ef11ce24 N |
932 | if (sock_is_loopback(newsock->sk)) |
933 | set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
934 | else | |
935 | clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
f9f3cc4f TT |
936 | if (serv->sv_stats) |
937 | serv->sv_stats->nettcpconn++; | |
938 | ||
939 | return &newsvsk->sk_xprt; | |
940 | ||
941 | failed: | |
319050d4 | 942 | sockfd_put(newsock); |
f9f3cc4f TT |
943 | return NULL; |
944 | } | |
945 | ||
ca07eda3 CL |
946 | static size_t svc_tcp_restore_pages(struct svc_sock *svsk, |
947 | struct svc_rqst *rqstp) | |
31d68ef6 | 948 | { |
ca07eda3 CL |
949 | size_t len = svsk->sk_datalen; |
950 | unsigned int i, npages; | |
31d68ef6 | 951 | |
ca07eda3 | 952 | if (!len) |
31d68ef6 | 953 | return 0; |
31d68ef6 BF |
954 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
955 | for (i = 0; i < npages; i++) { | |
956 | if (rqstp->rq_pages[i] != NULL) | |
957 | put_page(rqstp->rq_pages[i]); | |
958 | BUG_ON(svsk->sk_pages[i] == NULL); | |
959 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
960 | svsk->sk_pages[i] = NULL; | |
961 | } | |
962 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
963 | return len; | |
964 | } | |
965 | ||
966 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
967 | { | |
968 | unsigned int i, len, npages; | |
969 | ||
8af345f5 | 970 | if (svsk->sk_datalen == 0) |
31d68ef6 | 971 | return; |
8af345f5 | 972 | len = svsk->sk_datalen; |
31d68ef6 BF |
973 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
974 | for (i = 0; i < npages; i++) { | |
975 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
976 | rqstp->rq_pages[i] = NULL; | |
977 | } | |
978 | } | |
979 | ||
980 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
981 | { | |
982 | unsigned int i, len, npages; | |
983 | ||
8af345f5 | 984 | if (svsk->sk_datalen == 0) |
31d68ef6 | 985 | goto out; |
8af345f5 | 986 | len = svsk->sk_datalen; |
31d68ef6 BF |
987 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
988 | for (i = 0; i < npages; i++) { | |
cf3aa02c BF |
989 | if (svsk->sk_pages[i] == NULL) { |
990 | WARN_ON_ONCE(1); | |
991 | continue; | |
992 | } | |
31d68ef6 BF |
993 | put_page(svsk->sk_pages[i]); |
994 | svsk->sk_pages[i] = NULL; | |
995 | } | |
996 | out: | |
997 | svsk->sk_tcplen = 0; | |
8af345f5 | 998 | svsk->sk_datalen = 0; |
31d68ef6 BF |
999 | } |
1000 | ||
1da177e4 | 1001 | /* |
a5cda73e | 1002 | * Receive fragment record header into sk_marker. |
1da177e4 | 1003 | */ |
a5cda73e CL |
1004 | static ssize_t svc_tcp_read_marker(struct svc_sock *svsk, |
1005 | struct svc_rqst *rqstp) | |
1da177e4 | 1006 | { |
a5cda73e | 1007 | ssize_t want, len; |
1da177e4 | 1008 | |
a5cda73e CL |
1009 | /* If we haven't gotten the record length yet, |
1010 | * get the next four bytes. | |
1011 | */ | |
c0401ea0 | 1012 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
a5cda73e | 1013 | struct msghdr msg = { NULL }; |
1da177e4 LT |
1014 | struct kvec iov; |
1015 | ||
5ee78d48 | 1016 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
02648908 | 1017 | iov.iov_base = ((char *)&svsk->sk_marker) + svsk->sk_tcplen; |
1da177e4 | 1018 | iov.iov_len = want; |
de4eda9d | 1019 | iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, want); |
5e052dda | 1020 | len = svc_tcp_sock_recv_cmsg(svsk, &msg); |
4c8e5537 | 1021 | if (len < 0) |
a5cda73e | 1022 | return len; |
1da177e4 | 1023 | svsk->sk_tcplen += len; |
1da177e4 | 1024 | if (len < want) { |
a5cda73e CL |
1025 | /* call again to read the remaining bytes */ |
1026 | goto err_short; | |
1da177e4 | 1027 | } |
a5cda73e | 1028 | trace_svcsock_marker(&svsk->sk_xprt, svsk->sk_marker); |
836fbadb | 1029 | if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
a5cda73e CL |
1030 | svsk->sk_xprt.xpt_server->sv_max_mesg) |
1031 | goto err_too_large; | |
1da177e4 | 1032 | } |
cc248d4b | 1033 | return svc_sock_reclen(svsk); |
a5cda73e CL |
1034 | |
1035 | err_too_large: | |
1036 | net_notice_ratelimited("svc: %s %s RPC fragment too large: %d\n", | |
1037 | __func__, svsk->sk_xprt.xpt_server->sv_name, | |
1038 | svc_sock_reclen(svsk)); | |
e844d307 | 1039 | svc_xprt_deferred_close(&svsk->sk_xprt); |
a5cda73e | 1040 | err_short: |
8f55f3c0 AB |
1041 | return -EAGAIN; |
1042 | } | |
1043 | ||
586c52cc | 1044 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 1045 | { |
586c52cc | 1046 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 1047 | struct rpc_rqst *req = NULL; |
586c52cc TM |
1048 | struct kvec *src, *dst; |
1049 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
1050 | __be32 xid; |
1051 | __be32 calldir; | |
4cfc7e60 | 1052 | |
4cfc7e60 RI |
1053 | xid = *p++; |
1054 | calldir = *p; | |
1055 | ||
093a1468 | 1056 | if (!bc_xprt) |
586c52cc | 1057 | return -EAGAIN; |
75c84151 | 1058 | spin_lock(&bc_xprt->queue_lock); |
093a1468 TM |
1059 | req = xprt_lookup_rqst(bc_xprt, xid); |
1060 | if (!req) | |
1061 | goto unlock_notfound; | |
586c52cc TM |
1062 | |
1063 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1064 | /* | |
1065 | * XXX!: cheating for now! Only copying HEAD. | |
1066 | * But we know this is good enough for now (in fact, for any | |
1067 | * callback reply in the forseeable future). | |
1068 | */ | |
1069 | dst = &req->rq_private_buf.head[0]; | |
1070 | src = &rqstp->rq_arg.head[0]; | |
1071 | if (dst->iov_len < src->iov_len) | |
093a1468 | 1072 | goto unlock_eagain; /* whatever; just giving up. */ |
586c52cc | 1073 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
cc248d4b | 1074 | xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
586c52cc | 1075 | rqstp->rq_arg.len = 0; |
75c84151 | 1076 | spin_unlock(&bc_xprt->queue_lock); |
586c52cc | 1077 | return 0; |
093a1468 TM |
1078 | unlock_notfound: |
1079 | printk(KERN_NOTICE | |
1080 | "%s: Got unrecognized reply: " | |
1081 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1082 | __func__, ntohl(calldir), | |
1083 | bc_xprt, ntohl(xid)); | |
1084 | unlock_eagain: | |
75c84151 | 1085 | spin_unlock(&bc_xprt->queue_lock); |
093a1468 | 1086 | return -EAGAIN; |
586c52cc TM |
1087 | } |
1088 | ||
836fbadb BF |
1089 | static void svc_tcp_fragment_received(struct svc_sock *svsk) |
1090 | { | |
1091 | /* If we have more data, signal svc_xprt_enqueue() to try again */ | |
836fbadb | 1092 | svsk->sk_tcplen = 0; |
02648908 | 1093 | svsk->sk_marker = xdr_zero; |
836fbadb | 1094 | } |
31d68ef6 | 1095 | |
ca07eda3 CL |
1096 | /** |
1097 | * svc_tcp_recvfrom - Receive data from a TCP socket | |
1098 | * @rqstp: request structure into which to receive an RPC Call | |
1099 | * | |
1100 | * Called in a loop when XPT_DATA has been set. | |
1101 | * | |
1102 | * Read the 4-byte stream record marker, then use the record length | |
1103 | * in that marker to set up exactly the resources needed to receive | |
1104 | * the next RPC message into @rqstp. | |
1105 | * | |
1106 | * Returns: | |
1107 | * On success, the number of bytes in a received RPC Call, or | |
1108 | * %0 if a complete RPC Call message was not ready to return | |
1109 | * | |
1110 | * The zero return case handles partial receives and callback Replies. | |
1111 | * The state of a partial receive is preserved in the svc_sock for | |
1112 | * the next call to svc_tcp_recvfrom. | |
8f55f3c0 AB |
1113 | */ |
1114 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1115 | { | |
1116 | struct svc_sock *svsk = | |
1117 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1118 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
ca07eda3 CL |
1119 | size_t want, base; |
1120 | ssize_t len; | |
586c52cc TM |
1121 | __be32 *p; |
1122 | __be32 calldir; | |
8f55f3c0 | 1123 | |
a5cda73e CL |
1124 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1125 | len = svc_tcp_read_marker(svsk, rqstp); | |
8f55f3c0 AB |
1126 | if (len < 0) |
1127 | goto error; | |
1128 | ||
31d68ef6 | 1129 | base = svc_tcp_restore_pages(svsk, rqstp); |
a5cda73e | 1130 | want = len - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
ca07eda3 | 1131 | len = svc_tcp_read_msg(rqstp, base + want, base); |
8af345f5 | 1132 | if (len >= 0) { |
7dae1dd7 | 1133 | trace_svcsock_tcp_recv(&svsk->sk_xprt, len); |
31d68ef6 | 1134 | svsk->sk_tcplen += len; |
8af345f5 BF |
1135 | svsk->sk_datalen += len; |
1136 | } | |
6be8c594 CL |
1137 | if (len != want || !svc_sock_final_rec(svsk)) |
1138 | goto err_incomplete; | |
1139 | if (svsk->sk_datalen < 8) | |
1140 | goto err_nuts; | |
ad46ccf0 | 1141 | |
836fbadb | 1142 | rqstp->rq_arg.len = svsk->sk_datalen; |
1da177e4 | 1143 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1144 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1145 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1146 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1147 | } else |
1148 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1149 | |
5148bf4e | 1150 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 | 1151 | rqstp->rq_prot = IPPROTO_TCP; |
7501cc2b | 1152 | if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
7827c81f | 1153 | set_bit(RQ_LOCAL, &rqstp->rq_flags); |
7501cc2b | 1154 | else |
7827c81f | 1155 | clear_bit(RQ_LOCAL, &rqstp->rq_flags); |
1da177e4 | 1156 | |
586c52cc TM |
1157 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1158 | calldir = p[1]; | |
8985ef0b | 1159 | if (calldir) |
586c52cc | 1160 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1161 | |
1da177e4 | 1162 | /* Reset TCP read info */ |
8af345f5 | 1163 | svsk->sk_datalen = 0; |
836fbadb | 1164 | svc_tcp_fragment_received(svsk); |
0601f793 | 1165 | |
8985ef0b BF |
1166 | if (len < 0) |
1167 | goto error; | |
1da177e4 | 1168 | |
9dbc240f | 1169 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1170 | if (serv->sv_stats) |
1171 | serv->sv_stats->nettcpcnt++; | |
1172 | ||
319951eb | 1173 | svc_sock_secure_port(rqstp); |
82011c80 | 1174 | svc_xprt_received(rqstp->rq_xprt); |
5ee78d48 | 1175 | return rqstp->rq_arg.len; |
1da177e4 | 1176 | |
6be8c594 CL |
1177 | err_incomplete: |
1178 | svc_tcp_save_pages(svsk, rqstp); | |
1179 | if (len < 0 && len != -EAGAIN) | |
1180 | goto err_delete; | |
1181 | if (len == want) | |
1182 | svc_tcp_fragment_received(svsk); | |
1183 | else | |
1184 | trace_svcsock_tcp_recv_short(&svsk->sk_xprt, | |
1185 | svc_sock_reclen(svsk), | |
1186 | svsk->sk_tcplen - sizeof(rpc_fraghdr)); | |
1187 | goto err_noclose; | |
8f55f3c0 | 1188 | error: |
31d68ef6 | 1189 | if (len != -EAGAIN) |
ad46ccf0 | 1190 | goto err_delete; |
6be8c594 | 1191 | trace_svcsock_tcp_recv_eagain(&svsk->sk_xprt, 0); |
82011c80 | 1192 | goto err_noclose; |
6be8c594 CL |
1193 | err_nuts: |
1194 | svsk->sk_datalen = 0; | |
ad46ccf0 | 1195 | err_delete: |
6be8c594 | 1196 | trace_svcsock_tcp_recv_err(&svsk->sk_xprt, len); |
e844d307 | 1197 | svc_xprt_deferred_close(&svsk->sk_xprt); |
31d68ef6 | 1198 | err_noclose: |
82011c80 | 1199 | svc_xprt_received(rqstp->rq_xprt); |
9f9d2ebe | 1200 | return 0; /* record not complete */ |
1da177e4 LT |
1201 | } |
1202 | ||
4a85a6a3 CL |
1203 | static int svc_tcp_send_kvec(struct socket *sock, const struct kvec *vec, |
1204 | int flags) | |
1205 | { | |
1206 | return kernel_sendpage(sock, virt_to_page(vec->iov_base), | |
1207 | offset_in_page(vec->iov_base), | |
1208 | vec->iov_len, flags); | |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * kernel_sendpage() is used exclusively to reduce the number of | |
1213 | * copy operations in this path. Therefore the caller must ensure | |
1214 | * that the pages backing @xdr are unchanging. | |
1215 | * | |
1216 | * In addition, the logic assumes that * .bv_len is never larger | |
1217 | * than PAGE_SIZE. | |
1218 | */ | |
4d12b727 CL |
1219 | static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr, |
1220 | rpc_fraghdr marker, unsigned int *sentp) | |
4a85a6a3 CL |
1221 | { |
1222 | const struct kvec *head = xdr->head; | |
1223 | const struct kvec *tail = xdr->tail; | |
1224 | struct kvec rm = { | |
1225 | .iov_base = &marker, | |
1226 | .iov_len = sizeof(marker), | |
1227 | }; | |
4d12b727 CL |
1228 | struct msghdr msg = { |
1229 | .msg_flags = 0, | |
1230 | }; | |
987c7b1d | 1231 | int ret; |
4a85a6a3 CL |
1232 | |
1233 | *sentp = 0; | |
b056fa07 TM |
1234 | ret = xdr_alloc_bvec(xdr, GFP_KERNEL); |
1235 | if (ret < 0) | |
1236 | return ret; | |
4a85a6a3 | 1237 | |
4d12b727 | 1238 | ret = kernel_sendmsg(sock, &msg, &rm, 1, rm.iov_len); |
4a85a6a3 CL |
1239 | if (ret < 0) |
1240 | return ret; | |
1241 | *sentp += ret; | |
1242 | if (ret != rm.iov_len) | |
1243 | return -EAGAIN; | |
1244 | ||
987c7b1d | 1245 | ret = svc_tcp_send_kvec(sock, head, 0); |
4a85a6a3 CL |
1246 | if (ret < 0) |
1247 | return ret; | |
1248 | *sentp += ret; | |
1249 | if (ret != head->iov_len) | |
1250 | goto out; | |
1251 | ||
1252 | if (xdr->page_len) { | |
1253 | unsigned int offset, len, remaining; | |
1254 | struct bio_vec *bvec; | |
1255 | ||
bad4c6eb CL |
1256 | bvec = xdr->bvec + (xdr->page_base >> PAGE_SHIFT); |
1257 | offset = offset_in_page(xdr->page_base); | |
4a85a6a3 | 1258 | remaining = xdr->page_len; |
4a85a6a3 | 1259 | while (remaining > 0) { |
bad4c6eb | 1260 | len = min(remaining, bvec->bv_len - offset); |
4a85a6a3 CL |
1261 | ret = kernel_sendpage(sock, bvec->bv_page, |
1262 | bvec->bv_offset + offset, | |
987c7b1d | 1263 | len, 0); |
4a85a6a3 CL |
1264 | if (ret < 0) |
1265 | return ret; | |
1266 | *sentp += ret; | |
1267 | if (ret != len) | |
1268 | goto out; | |
1269 | remaining -= len; | |
1270 | offset = 0; | |
1271 | bvec++; | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | if (tail->iov_len) { | |
1276 | ret = svc_tcp_send_kvec(sock, tail, 0); | |
1277 | if (ret < 0) | |
1278 | return ret; | |
1279 | *sentp += ret; | |
1280 | } | |
1281 | ||
1282 | out: | |
1283 | return 0; | |
1284 | } | |
1285 | ||
da1661b9 CL |
1286 | /** |
1287 | * svc_tcp_sendto - Send out a reply on a TCP socket | |
1288 | * @rqstp: completed svc_rqst | |
1289 | * | |
ca4faf54 CL |
1290 | * xpt_mutex ensures @rqstp's whole message is written to the socket |
1291 | * without interruption. | |
1292 | * | |
da1661b9 | 1293 | * Returns the number of bytes sent, or a negative errno. |
1da177e4 | 1294 | */ |
0f0257ea | 1295 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 | 1296 | { |
da1661b9 CL |
1297 | struct svc_xprt *xprt = rqstp->rq_xprt; |
1298 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1299 | struct xdr_buf *xdr = &rqstp->rq_res; | |
1300 | rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | | |
1301 | (u32)xdr->len); | |
3f649ab7 | 1302 | unsigned int sent; |
da1661b9 | 1303 | int err; |
1da177e4 | 1304 | |
948f072a N |
1305 | svc_tcp_release_ctxt(xprt, rqstp->rq_xprt_ctxt); |
1306 | rqstp->rq_xprt_ctxt = NULL; | |
23cf1ee1 | 1307 | |
e0a912e8 | 1308 | atomic_inc(&svsk->sk_sendqlen); |
ca4faf54 CL |
1309 | mutex_lock(&xprt->xpt_mutex); |
1310 | if (svc_xprt_is_dead(xprt)) | |
1311 | goto out_notconn; | |
e0a912e8 | 1312 | tcp_sock_set_cork(svsk->sk_sk, true); |
4d12b727 | 1313 | err = svc_tcp_sendmsg(svsk->sk_sock, xdr, marker, &sent); |
da1661b9 | 1314 | xdr_free_bvec(xdr); |
cb579086 | 1315 | trace_svcsock_tcp_send(xprt, err < 0 ? (long)err : sent); |
da1661b9 CL |
1316 | if (err < 0 || sent != (xdr->len + sizeof(marker))) |
1317 | goto out_close; | |
e0a912e8 TM |
1318 | if (atomic_dec_and_test(&svsk->sk_sendqlen)) |
1319 | tcp_sock_set_cork(svsk->sk_sk, false); | |
ca4faf54 | 1320 | mutex_unlock(&xprt->xpt_mutex); |
1da177e4 | 1321 | return sent; |
da1661b9 | 1322 | |
ca4faf54 | 1323 | out_notconn: |
e0a912e8 | 1324 | atomic_dec(&svsk->sk_sendqlen); |
ca4faf54 CL |
1325 | mutex_unlock(&xprt->xpt_mutex); |
1326 | return -ENOTCONN; | |
da1661b9 CL |
1327 | out_close: |
1328 | pr_notice("rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n", | |
1329 | xprt->xpt_server->sv_name, | |
1330 | (err < 0) ? "got error" : "sent", | |
1331 | (err < 0) ? err : sent, xdr->len); | |
e844d307 | 1332 | svc_xprt_deferred_close(xprt); |
e0a912e8 | 1333 | atomic_dec(&svsk->sk_sendqlen); |
ca4faf54 | 1334 | mutex_unlock(&xprt->xpt_mutex); |
da1661b9 | 1335 | return -EAGAIN; |
1da177e4 LT |
1336 | } |
1337 | ||
b700cbb1 | 1338 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1339 | struct net *net, |
b700cbb1 TT |
1340 | struct sockaddr *sa, int salen, |
1341 | int flags) | |
1342 | { | |
62832c03 | 1343 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1344 | } |
1345 | ||
2412e927 | 1346 | static const struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1347 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1348 | .xpo_recvfrom = svc_tcp_recvfrom, |
1349 | .xpo_sendto = svc_tcp_sendto, | |
03493bca | 1350 | .xpo_result_payload = svc_sock_result_payload, |
948f072a | 1351 | .xpo_release_ctxt = svc_tcp_release_ctxt, |
69b6ba37 | 1352 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1353 | .xpo_free = svc_sock_free, |
323bee32 | 1354 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1355 | .xpo_accept = svc_tcp_accept, |
ea08e392 | 1356 | .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt, |
b3cbf98e | 1357 | .xpo_handshake = svc_tcp_handshake, |
360d8738 TT |
1358 | }; |
1359 | ||
1360 | static struct svc_xprt_class svc_tcp_class = { | |
1361 | .xcl_name = "tcp", | |
b700cbb1 | 1362 | .xcl_owner = THIS_MODULE, |
360d8738 | 1363 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1364 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
3c45ddf8 | 1365 | .xcl_ident = XPRT_TRANSPORT_TCP, |
360d8738 TT |
1366 | }; |
1367 | ||
1368 | void svc_init_xprt_sock(void) | |
1369 | { | |
1370 | svc_reg_xprt_class(&svc_tcp_class); | |
1371 | svc_reg_xprt_class(&svc_udp_class); | |
1372 | } | |
1373 | ||
1374 | void svc_cleanup_xprt_sock(void) | |
1375 | { | |
1376 | svc_unreg_xprt_class(&svc_tcp_class); | |
1377 | svc_unreg_xprt_class(&svc_udp_class); | |
1378 | } | |
1379 | ||
bb5cf160 | 1380 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1381 | { |
1382 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1383 | |
bd4620dd SK |
1384 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1385 | &svsk->sk_xprt, serv); | |
def13d74 | 1386 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
362142b2 | 1387 | set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1388 | if (sk->sk_state == TCP_LISTEN) { |
ece200dd | 1389 | strcpy(svsk->sk_xprt.xpt_remotebuf, "listener"); |
02fc6c36 | 1390 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1391 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1392 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1393 | } else { |
1da177e4 | 1394 | sk->sk_state_change = svc_tcp_state_change; |
fa9251af | 1395 | sk->sk_data_ready = svc_data_ready; |
637600f3 | 1396 | sk->sk_write_space = svc_write_space; |
1da177e4 | 1397 | |
02648908 | 1398 | svsk->sk_marker = xdr_zero; |
1da177e4 | 1399 | svsk->sk_tcplen = 0; |
8af345f5 | 1400 | svsk->sk_datalen = 0; |
31d68ef6 | 1401 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1402 | |
e0a912e8 | 1403 | tcp_sock_set_nodelay(sk); |
1da177e4 | 1404 | |
02fc6c36 | 1405 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
b2f21f7d TM |
1406 | switch (sk->sk_state) { |
1407 | case TCP_SYN_RECV: | |
1408 | case TCP_ESTABLISHED: | |
1409 | break; | |
1410 | default: | |
e844d307 | 1411 | svc_xprt_deferred_close(&svsk->sk_xprt); |
b2f21f7d | 1412 | } |
1da177e4 LT |
1413 | } |
1414 | } | |
1415 | ||
0f0257ea | 1416 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1417 | { |
1418 | /* | |
1419 | * The number of server threads has changed. Update | |
1420 | * rcvbuf and sndbuf accordingly on all sockets | |
1421 | */ | |
8f3a6de3 | 1422 | struct svc_sock *svsk; |
1da177e4 LT |
1423 | |
1424 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1425 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1426 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1427 | spin_unlock_bh(&serv->sv_lock); |
1428 | } | |
24c3767e | 1429 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1430 | |
1da177e4 LT |
1431 | /* |
1432 | * Initialize socket for RPC use and create svc_sock struct | |
1da177e4 | 1433 | */ |
6b174337 CL |
1434 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1435 | struct socket *sock, | |
72c35376 | 1436 | int flags) |
1da177e4 LT |
1437 | { |
1438 | struct svc_sock *svsk; | |
1439 | struct sock *inet; | |
6b174337 | 1440 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
1da177e4 | 1441 | |
72c35376 BF |
1442 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1443 | if (!svsk) | |
1444 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1445 | |
1446 | inet = sock->sk; | |
1447 | ||
ae0d7770 CL |
1448 | if (pmap_register) { |
1449 | int err; | |
1450 | ||
72c35376 | 1451 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, |
5247fab5 | 1452 | inet->sk_protocol, |
c720c7e8 | 1453 | ntohs(inet_sk(inet)->inet_sport)); |
ae0d7770 | 1454 | if (err < 0) { |
ae0d7770 CL |
1455 | kfree(svsk); |
1456 | return ERR_PTR(err); | |
1457 | } | |
1da177e4 LT |
1458 | } |
1459 | ||
1da177e4 LT |
1460 | svsk->sk_sock = sock; |
1461 | svsk->sk_sk = inet; | |
1462 | svsk->sk_ostate = inet->sk_state_change; | |
1463 | svsk->sk_odata = inet->sk_data_ready; | |
1464 | svsk->sk_owspace = inet->sk_write_space; | |
eebe53e8 VL |
1465 | /* |
1466 | * This barrier is necessary in order to prevent race condition | |
1467 | * with svc_data_ready(), svc_listen_data_ready() and others | |
1468 | * when calling callbacks above. | |
1469 | */ | |
1470 | wmb(); | |
1471 | inet->sk_user_data = svsk; | |
1da177e4 LT |
1472 | |
1473 | /* Initialize the socket */ | |
1474 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1475 | svc_udp_init(svsk, serv); |
637600f3 | 1476 | else |
bb5cf160 | 1477 | svc_tcp_init(svsk, serv); |
1da177e4 | 1478 | |
998024de | 1479 | trace_svcsock_new_socket(sock); |
1da177e4 LT |
1480 | return svsk; |
1481 | } | |
1482 | ||
30646394 SK |
1483 | bool svc_alien_sock(struct net *net, int fd) |
1484 | { | |
1485 | int err; | |
1486 | struct socket *sock = sockfd_lookup(fd, &err); | |
1487 | bool ret = false; | |
1488 | ||
1489 | if (!sock) | |
1490 | goto out; | |
1491 | if (sock_net(sock->sk) != net) | |
1492 | ret = true; | |
1493 | sockfd_put(sock); | |
1494 | out: | |
1495 | return ret; | |
1496 | } | |
1497 | EXPORT_SYMBOL_GPL(svc_alien_sock); | |
1498 | ||
bfba9ab4 CL |
1499 | /** |
1500 | * svc_addsock - add a listener socket to an RPC service | |
1501 | * @serv: pointer to RPC service to which to add a new listener | |
1502 | * @fd: file descriptor of the new listener | |
1503 | * @name_return: pointer to buffer to fill in with name of listener | |
1504 | * @len: size of the buffer | |
4df493a2 | 1505 | * @cred: credential |
bfba9ab4 CL |
1506 | * |
1507 | * Fills in socket name and returns positive length of name if successful. | |
1508 | * Name is terminated with '\n'. On error, returns a negative errno | |
1509 | * value. | |
1510 | */ | |
1511 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
4df493a2 | 1512 | const size_t len, const struct cred *cred) |
b41b66d6 N |
1513 | { |
1514 | int err = 0; | |
1515 | struct socket *so = sockfd_lookup(fd, &err); | |
1516 | struct svc_sock *svsk = NULL; | |
a8e10078 BF |
1517 | struct sockaddr_storage addr; |
1518 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1519 | int salen; | |
b41b66d6 N |
1520 | |
1521 | if (!so) | |
1522 | return err; | |
a8e10078 | 1523 | err = -EAFNOSUPPORT; |
205ba423 | 1524 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
a8e10078 BF |
1525 | goto out; |
1526 | err = -EPROTONOSUPPORT; | |
1527 | if (so->sk->sk_protocol != IPPROTO_TCP && | |
b41b66d6 | 1528 | so->sk->sk_protocol != IPPROTO_UDP) |
a8e10078 BF |
1529 | goto out; |
1530 | err = -EISCONN; | |
1531 | if (so->state > SS_UNCONNECTED) | |
1532 | goto out; | |
1533 | err = -ENOENT; | |
1534 | if (!try_module_get(THIS_MODULE)) | |
1535 | goto out; | |
1536 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); | |
1537 | if (IS_ERR(svsk)) { | |
1538 | module_put(THIS_MODULE); | |
1539 | err = PTR_ERR(svsk); | |
1540 | goto out; | |
b41b66d6 | 1541 | } |
9b2c45d4 DV |
1542 | salen = kernel_getsockname(svsk->sk_sock, sin); |
1543 | if (salen >= 0) | |
a8e10078 | 1544 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); |
4df493a2 | 1545 | svsk->sk_xprt.xpt_cred = get_cred(cred); |
39b55301 | 1546 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
e7942b9f | 1547 | return svc_one_sock_name(svsk, name_return, len); |
a8e10078 BF |
1548 | out: |
1549 | sockfd_put(so); | |
1550 | return err; | |
b41b66d6 N |
1551 | } |
1552 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1553 | ||
1da177e4 LT |
1554 | /* |
1555 | * Create socket for RPC service. | |
1556 | */ | |
b700cbb1 TT |
1557 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1558 | int protocol, | |
62832c03 | 1559 | struct net *net, |
b700cbb1 TT |
1560 | struct sockaddr *sin, int len, |
1561 | int flags) | |
1da177e4 LT |
1562 | { |
1563 | struct svc_sock *svsk; | |
1564 | struct socket *sock; | |
1565 | int error; | |
1566 | int type; | |
9dbc240f TT |
1567 | struct sockaddr_storage addr; |
1568 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1569 | int newlen; | |
c69da774 | 1570 | int family; |
1da177e4 LT |
1571 | |
1572 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1573 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1574 | "sockets supported\n"); | |
b700cbb1 | 1575 | return ERR_PTR(-EINVAL); |
1da177e4 | 1576 | } |
c69da774 | 1577 | |
1da177e4 | 1578 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1579 | switch (sin->sa_family) { |
1580 | case AF_INET6: | |
1581 | family = PF_INET6; | |
1582 | break; | |
1583 | case AF_INET: | |
1584 | family = PF_INET; | |
1585 | break; | |
1586 | default: | |
1587 | return ERR_PTR(-EINVAL); | |
1588 | } | |
1da177e4 | 1589 | |
14ec63c3 | 1590 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1591 | if (error < 0) |
b700cbb1 | 1592 | return ERR_PTR(error); |
1da177e4 | 1593 | |
ed07536e PZ |
1594 | svc_reclassify_socket(sock); |
1595 | ||
c69da774 TM |
1596 | /* |
1597 | * If this is an PF_INET6 listener, we want to avoid | |
1598 | * getting requests from IPv4 remotes. Those should | |
1599 | * be shunted to a PF_INET listener via rpcbind. | |
1600 | */ | |
c69da774 | 1601 | if (family == PF_INET6) |
9b115749 | 1602 | ip6_sock_set_v6only(sock->sk); |
18114746 | 1603 | if (type == SOCK_STREAM) |
4a17fd52 | 1604 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
77f1f67a | 1605 | error = kernel_bind(sock, sin, len); |
18114746 ES |
1606 | if (error < 0) |
1607 | goto bummer; | |
1da177e4 | 1608 | |
9b2c45d4 | 1609 | error = kernel_getsockname(sock, newsin); |
9dbc240f TT |
1610 | if (error < 0) |
1611 | goto bummer; | |
9b2c45d4 | 1612 | newlen = error; |
9dbc240f | 1613 | |
1da177e4 | 1614 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1615 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1616 | goto bummer; |
1617 | } | |
1618 | ||
72c35376 | 1619 | svsk = svc_setup_socket(serv, sock, flags); |
a8e10078 BF |
1620 | if (IS_ERR(svsk)) { |
1621 | error = PTR_ERR(svsk); | |
1622 | goto bummer; | |
e79eff1f | 1623 | } |
a8e10078 BF |
1624 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
1625 | return (struct svc_xprt *)svsk; | |
1da177e4 | 1626 | bummer: |
1da177e4 | 1627 | sock_release(sock); |
b700cbb1 | 1628 | return ERR_PTR(error); |
1da177e4 LT |
1629 | } |
1630 | ||
755cceab TT |
1631 | /* |
1632 | * Detach the svc_sock from the socket so that no | |
1633 | * more callbacks occur. | |
1634 | */ | |
1635 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1636 | { | |
1637 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1638 | struct sock *sk = svsk->sk_sk; | |
1639 | ||
755cceab | 1640 | /* put back the old socket callbacks */ |
069c225b | 1641 | lock_sock(sk); |
755cceab TT |
1642 | sk->sk_state_change = svsk->sk_ostate; |
1643 | sk->sk_data_ready = svsk->sk_odata; | |
1644 | sk->sk_write_space = svsk->sk_owspace; | |
069c225b TM |
1645 | sk->sk_user_data = NULL; |
1646 | release_sock(sk); | |
69b6ba37 TM |
1647 | } |
1648 | ||
1649 | /* | |
1650 | * Disconnect the socket, and reset the callbacks | |
1651 | */ | |
1652 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1653 | { | |
1654 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1655 | ||
69b6ba37 TM |
1656 | svc_sock_detach(xprt); |
1657 | ||
31d68ef6 BF |
1658 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1659 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1660 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1661 | } |
755cceab TT |
1662 | } |
1663 | ||
1664 | /* | |
1665 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1666 | */ | |
1667 | static void svc_sock_free(struct svc_xprt *xprt) | |
1668 | { | |
1669 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
b3cbf98e | 1670 | struct socket *sock = svsk->sk_sock; |
755cceab | 1671 | |
b3cbf98e CL |
1672 | tls_handshake_cancel(sock->sk); |
1673 | if (sock->file) | |
1674 | sockfd_put(sock); | |
755cceab | 1675 | else |
b3cbf98e | 1676 | sock_release(sock); |
755cceab TT |
1677 | kfree(svsk); |
1678 | } |