Commit | Line | Data |
---|---|---|
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> |
7c0f6ba6 | 46 | #include <linux/uaccess.h> |
1da177e4 | 47 | #include <asm/ioctls.h> |
22911fc5 | 48 | #include <trace/events/skb.h> |
1da177e4 LT |
49 | |
50 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 51 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 52 | #include <linux/sunrpc/xdr.h> |
c0401ea0 | 53 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 LT |
54 | #include <linux/sunrpc/svcsock.h> |
55 | #include <linux/sunrpc/stats.h> | |
4cfc7e60 | 56 | #include <linux/sunrpc/xprt.h> |
1da177e4 | 57 | |
177e4f99 HS |
58 | #include "sunrpc.h" |
59 | ||
360d8738 | 60 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
61 | |
62 | ||
63 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
72c35376 | 64 | int flags); |
1da177e4 LT |
65 | static int svc_udp_recvfrom(struct svc_rqst *); |
66 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 67 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 68 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 69 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 70 | |
b700cbb1 | 71 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
62832c03 PE |
72 | struct net *, struct sockaddr *, |
73 | int, int); | |
ed07536e PZ |
74 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
75 | static struct lock_class_key svc_key[2]; | |
76 | static struct lock_class_key svc_slock_key[2]; | |
77 | ||
0f0257ea | 78 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
79 | { |
80 | struct sock *sk = sock->sk; | |
1b7a1819 | 81 | |
fafc4e1e | 82 | if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) |
1b7a1819 WAA |
83 | return; |
84 | ||
ed07536e PZ |
85 | switch (sk->sk_family) { |
86 | case AF_INET: | |
87 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
88 | &svc_slock_key[0], |
89 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
90 | &svc_key[0]); | |
ed07536e PZ |
91 | break; |
92 | ||
93 | case AF_INET6: | |
94 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
95 | &svc_slock_key[1], |
96 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
97 | &svc_key[1]); | |
ed07536e PZ |
98 | break; |
99 | ||
100 | default: | |
101 | BUG(); | |
102 | } | |
103 | } | |
104 | #else | |
0f0257ea | 105 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
106 | { |
107 | } | |
108 | #endif | |
109 | ||
1da177e4 LT |
110 | /* |
111 | * Release an skbuff after use | |
112 | */ | |
5148bf4e | 113 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 114 | { |
5148bf4e | 115 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
116 | |
117 | if (skb) { | |
57b1d3ba TT |
118 | struct svc_sock *svsk = |
119 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 120 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
121 | |
122 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 123 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 124 | } |
1da177e4 LT |
125 | } |
126 | ||
850cbadd PA |
127 | static void svc_release_udp_skb(struct svc_rqst *rqstp) |
128 | { | |
129 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; | |
130 | ||
131 | if (skb) { | |
132 | rqstp->rq_xprt_ctxt = NULL; | |
133 | ||
134 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
135 | consume_skb(skb); | |
136 | } | |
137 | } | |
138 | ||
b92503b2 CL |
139 | union svc_pktinfo_u { |
140 | struct in_pktinfo pkti; | |
b92503b2 | 141 | struct in6_pktinfo pkti6; |
b92503b2 | 142 | }; |
bc375ea7 DM |
143 | #define SVC_PKTINFO_SPACE \ |
144 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
145 | |
146 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
147 | { | |
57b1d3ba TT |
148 | struct svc_sock *svsk = |
149 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
150 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
151 | case AF_INET: { |
152 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
153 | ||
154 | cmh->cmsg_level = SOL_IP; | |
155 | cmh->cmsg_type = IP_PKTINFO; | |
156 | pki->ipi_ifindex = 0; | |
849a1cf1 MJ |
157 | pki->ipi_spec_dst.s_addr = |
158 | svc_daddr_in(rqstp)->sin_addr.s_addr; | |
b92503b2 CL |
159 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
160 | } | |
161 | break; | |
5a05ed73 | 162 | |
b92503b2 CL |
163 | case AF_INET6: { |
164 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 | 165 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
b92503b2 CL |
166 | |
167 | cmh->cmsg_level = SOL_IPV6; | |
168 | cmh->cmsg_type = IPV6_PKTINFO; | |
849a1cf1 | 169 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
4e3fd7a0 | 170 | pki->ipi6_addr = daddr->sin6_addr; |
b92503b2 CL |
171 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
172 | } | |
173 | break; | |
b92503b2 | 174 | } |
b92503b2 CL |
175 | } |
176 | ||
1da177e4 | 177 | /* |
4cfc7e60 | 178 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 179 | */ |
4cfc7e60 RI |
180 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
181 | struct page *headpage, unsigned long headoffset, | |
182 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 183 | { |
1da177e4 LT |
184 | int result; |
185 | int size; | |
186 | struct page **ppage = xdr->pages; | |
187 | size_t base = xdr->page_base; | |
188 | unsigned int pglen = xdr->page_len; | |
226453d8 | 189 | unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST; |
4cfc7e60 RI |
190 | int slen; |
191 | int len = 0; | |
1da177e4 LT |
192 | |
193 | slen = xdr->len; | |
194 | ||
1da177e4 LT |
195 | /* send head */ |
196 | if (slen == xdr->head[0].iov_len) | |
197 | flags = 0; | |
4cfc7e60 | 198 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 199 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
200 | if (len != xdr->head[0].iov_len) |
201 | goto out; | |
202 | slen -= xdr->head[0].iov_len; | |
203 | if (slen == 0) | |
204 | goto out; | |
205 | ||
206 | /* send page data */ | |
207 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
208 | while (pglen > 0) { | |
209 | if (slen == size) | |
210 | flags = 0; | |
e6242e92 | 211 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
212 | if (result > 0) |
213 | len += result; | |
214 | if (result != size) | |
215 | goto out; | |
216 | slen -= size; | |
217 | pglen -= size; | |
218 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
219 | base = 0; | |
220 | ppage++; | |
221 | } | |
4cfc7e60 | 222 | |
1da177e4 LT |
223 | /* send tail */ |
224 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
225 | result = kernel_sendpage(sock, tailpage, tailoffset, |
226 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
227 | if (result > 0) |
228 | len += result; | |
229 | } | |
4cfc7e60 RI |
230 | |
231 | out: | |
232 | return len; | |
233 | } | |
234 | ||
235 | ||
236 | /* | |
237 | * Generic sendto routine | |
238 | */ | |
239 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
240 | { | |
241 | struct svc_sock *svsk = | |
242 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
243 | struct socket *sock = svsk->sk_sock; | |
244 | union { | |
245 | struct cmsghdr hdr; | |
246 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
247 | } buffer; | |
248 | struct cmsghdr *cmh = &buffer.hdr; | |
249 | int len = 0; | |
250 | unsigned long tailoff; | |
251 | unsigned long headoff; | |
252 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
253 | ||
254 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
255 | struct msghdr msg = { | |
256 | .msg_name = &rqstp->rq_addr, | |
257 | .msg_namelen = rqstp->rq_addrlen, | |
258 | .msg_control = cmh, | |
259 | .msg_controllen = sizeof(buffer), | |
260 | .msg_flags = MSG_MORE, | |
261 | }; | |
262 | ||
263 | svc_set_cmsg_data(rqstp, cmh); | |
264 | ||
d8725c86 | 265 | if (sock_sendmsg(sock, &msg) < 0) |
4cfc7e60 RI |
266 | goto out; |
267 | } | |
268 | ||
269 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
270 | headoff = 0; | |
271 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
272 | rqstp->rq_respages[0], tailoff); | |
273 | ||
1da177e4 | 274 | out: |
5b5e0928 | 275 | dprintk("svc: socket %p sendto([%p %zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 276 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 277 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
278 | |
279 | return len; | |
280 | } | |
281 | ||
80212d59 N |
282 | /* |
283 | * Report socket names for nfsdfs | |
284 | */ | |
e7942b9f | 285 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 286 | { |
017cb47f CL |
287 | const struct sock *sk = svsk->sk_sk; |
288 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
289 | "udp" : "tcp"; | |
80212d59 N |
290 | int len; |
291 | ||
017cb47f | 292 | switch (sk->sk_family) { |
e7942b9f CL |
293 | case PF_INET: |
294 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 295 | proto_name, |
c720c7e8 ED |
296 | &inet_sk(sk)->inet_rcv_saddr, |
297 | inet_sk(sk)->inet_num); | |
80212d59 | 298 | break; |
c2bb06db | 299 | #if IS_ENABLED(CONFIG_IPV6) |
58de2f86 CL |
300 | case PF_INET6: |
301 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f | 302 | proto_name, |
efe4208f | 303 | &sk->sk_v6_rcv_saddr, |
c720c7e8 | 304 | inet_sk(sk)->inet_num); |
80212d59 | 305 | break; |
c2bb06db | 306 | #endif |
80212d59 | 307 | default: |
e7942b9f | 308 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 309 | sk->sk_family); |
80212d59 | 310 | } |
e7942b9f CL |
311 | |
312 | if (len >= remaining) { | |
313 | *buf = '\0'; | |
314 | return -ENAMETOOLONG; | |
80212d59 N |
315 | } |
316 | return len; | |
317 | } | |
318 | ||
1da177e4 LT |
319 | /* |
320 | * Generic recvfrom routine. | |
321 | */ | |
4c8e5537 TM |
322 | static ssize_t svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, |
323 | unsigned int nr, size_t buflen, unsigned int base) | |
1da177e4 | 324 | { |
57b1d3ba TT |
325 | struct svc_sock *svsk = |
326 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
4c8e5537 TM |
327 | struct msghdr msg = { NULL }; |
328 | ssize_t len; | |
1da177e4 | 329 | |
260c1d12 TT |
330 | rqstp->rq_xprt_hlen = 0; |
331 | ||
f8d1ff47 | 332 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
aa563d7b | 333 | iov_iter_kvec(&msg.msg_iter, READ, iov, nr, buflen); |
4c8e5537 TM |
334 | if (base != 0) { |
335 | iov_iter_advance(&msg.msg_iter, base); | |
336 | buflen -= base; | |
337 | } | |
338 | len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT); | |
f8d1ff47 TM |
339 | /* If we read a full record, then assume there may be more |
340 | * data to read (stream based sockets only!) | |
341 | */ | |
342 | if (len == buflen) | |
343 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1da177e4 | 344 | |
4c8e5537 | 345 | dprintk("svc: socket %p recvfrom(%p, %zu) = %zd\n", |
1ba95105 | 346 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
347 | return len; |
348 | } | |
349 | ||
350 | /* | |
351 | * Set socket snd and rcv buffer lengths | |
352 | */ | |
b7e5034c | 353 | static void svc_sock_setbufsize(struct svc_sock *svsk, unsigned int nreqs) |
1da177e4 | 354 | { |
b7e5034c BF |
355 | unsigned int max_mesg = svsk->sk_xprt.xpt_server->sv_max_mesg; |
356 | struct socket *sock = svsk->sk_sock; | |
357 | ||
358 | nreqs = min(nreqs, INT_MAX / 2 / max_mesg); | |
359 | ||
1da177e4 | 360 | lock_sock(sock->sk); |
b7e5034c BF |
361 | sock->sk->sk_sndbuf = nreqs * max_mesg * 2; |
362 | sock->sk->sk_rcvbuf = nreqs * max_mesg * 2; | |
47fcb03f | 363 | sock->sk->sk_write_space(sock->sk); |
1da177e4 | 364 | release_sock(sock->sk); |
1da177e4 | 365 | } |
16e4d93f | 366 | |
989f881e | 367 | static void svc_sock_secure_port(struct svc_rqst *rqstp) |
16e4d93f | 368 | { |
989f881e CL |
369 | if (svc_port_is_privileged(svc_addr(rqstp))) |
370 | set_bit(RQ_SECURE, &rqstp->rq_flags); | |
371 | else | |
372 | clear_bit(RQ_SECURE, &rqstp->rq_flags); | |
16e4d93f CL |
373 | } |
374 | ||
1da177e4 LT |
375 | /* |
376 | * INET callback when data has been received on the socket. | |
377 | */ | |
fa9251af | 378 | static void svc_data_ready(struct sock *sk) |
1da177e4 | 379 | { |
939bb7ef | 380 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 381 | |
939bb7ef | 382 | if (svsk) { |
676d2369 DM |
383 | dprintk("svc: socket %p(inet %p), busy=%d\n", |
384 | svsk, sk, | |
02fc6c36 | 385 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
eebe53e8 VL |
386 | |
387 | /* Refer to svc_setup_socket() for details. */ | |
388 | rmb(); | |
fa9251af | 389 | svsk->sk_odata(sk); |
4720b070 TM |
390 | if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) |
391 | svc_xprt_enqueue(&svsk->sk_xprt); | |
939bb7ef | 392 | } |
1da177e4 LT |
393 | } |
394 | ||
395 | /* | |
396 | * INET callback when space is newly available on the socket. | |
397 | */ | |
0f0257ea | 398 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
399 | { |
400 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
401 | ||
402 | if (svsk) { | |
403 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 404 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
eebe53e8 VL |
405 | |
406 | /* Refer to svc_setup_socket() for details. */ | |
407 | rmb(); | |
fa9251af | 408 | svsk->sk_owspace(sk); |
f6150c3c | 409 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 410 | } |
1da177e4 LT |
411 | } |
412 | ||
c7fb3f06 TM |
413 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
414 | { | |
637600f3 | 415 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
c7fb3f06 TM |
416 | |
417 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
418 | return 1; | |
637600f3 | 419 | return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
51877680 TM |
420 | } |
421 | ||
ea08e392 SM |
422 | static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt) |
423 | { | |
424 | struct svc_sock *svsk; | |
425 | struct socket *sock; | |
426 | struct linger no_linger = { | |
427 | .l_onoff = 1, | |
428 | .l_linger = 0, | |
429 | }; | |
430 | ||
431 | svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
432 | sock = svsk->sk_sock; | |
433 | kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER, | |
434 | (char *)&no_linger, sizeof(no_linger)); | |
435 | } | |
436 | ||
7702ce40 CL |
437 | /* |
438 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
439 | */ | |
440 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
441 | struct cmsghdr *cmh) | |
442 | { | |
443 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
444 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
445 | ||
7702ce40 CL |
446 | if (cmh->cmsg_type != IP_PKTINFO) |
447 | return 0; | |
849a1cf1 MJ |
448 | |
449 | daddr->sin_family = AF_INET; | |
450 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
451 | return 1; |
452 | } | |
453 | ||
454 | /* | |
73df66f8 | 455 | * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
7702ce40 CL |
456 | */ |
457 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
458 | struct cmsghdr *cmh) | |
459 | { | |
460 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
461 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
462 | ||
7702ce40 CL |
463 | if (cmh->cmsg_type != IPV6_PKTINFO) |
464 | return 0; | |
849a1cf1 MJ |
465 | |
466 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 467 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 468 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
469 | return 1; |
470 | } | |
471 | ||
9dbc240f TT |
472 | /* |
473 | * Copy the UDP datagram's destination address to the rqstp structure. | |
474 | * The 'destination' address in this case is the address to which the | |
475 | * peer sent the datagram, i.e. our local address. For multihomed | |
476 | * hosts, this can change from msg to msg. Note that only the IP | |
477 | * address changes, the port number should remain the same. | |
478 | */ | |
7702ce40 CL |
479 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
480 | struct cmsghdr *cmh) | |
95756482 | 481 | { |
7702ce40 CL |
482 | switch (cmh->cmsg_level) { |
483 | case SOL_IP: | |
484 | return svc_udp_get_dest_address4(rqstp, cmh); | |
485 | case SOL_IPV6: | |
486 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 487 | } |
7702ce40 CL |
488 | |
489 | return 0; | |
95756482 CL |
490 | } |
491 | ||
1da177e4 LT |
492 | /* |
493 | * Receive a datagram from a UDP socket. | |
494 | */ | |
0f0257ea | 495 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 496 | { |
57b1d3ba TT |
497 | struct svc_sock *svsk = |
498 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 499 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 500 | struct sk_buff *skb; |
bc375ea7 DM |
501 | union { |
502 | struct cmsghdr hdr; | |
503 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
504 | } buffer; | |
505 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
506 | struct msghdr msg = { |
507 | .msg_name = svc_addr(rqstp), | |
508 | .msg_control = cmh, | |
509 | .msg_controllen = sizeof(buffer), | |
510 | .msg_flags = MSG_DONTWAIT, | |
511 | }; | |
abc5c44d CL |
512 | size_t len; |
513 | int err; | |
1da177e4 | 514 | |
02fc6c36 | 515 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
516 | /* udp sockets need large rcvbuf as all pending |
517 | * requests are still in that buffer. sndbuf must | |
518 | * also be large enough that there is enough space | |
3262c816 GB |
519 | * for one reply per thread. We count all threads |
520 | * rather than threads in a particular pool, which | |
521 | * provides an upper bound on the number of threads | |
522 | * which will access the socket. | |
1da177e4 | 523 | */ |
b7e5034c | 524 | svc_sock_setbufsize(svsk, serv->sv_nrthreads + 3); |
1da177e4 | 525 | |
02fc6c36 | 526 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
527 | skb = NULL; |
528 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
529 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
530 | if (err >= 0) | |
7c13f97f | 531 | skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err); |
05ed690e N |
532 | |
533 | if (skb == NULL) { | |
534 | if (err != -EAGAIN) { | |
535 | /* possibly an icmp error */ | |
536 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 537 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 538 | } |
9f9d2ebe | 539 | return 0; |
1da177e4 | 540 | } |
9dbc240f | 541 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 542 | rqstp->rq_addrlen = len; |
2456e855 | 543 | if (skb->tstamp == 0) { |
b7aa0bf7 | 544 | skb->tstamp = ktime_get_real(); |
cca5172a | 545 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
546 | need that much accuracy */ |
547 | } | |
3a0ed3e9 | 548 | sock_write_timestamp(svsk->sk_sk, skb->tstamp); |
02fc6c36 | 549 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 550 | |
1da8c681 | 551 | len = skb->len; |
1da177e4 LT |
552 | rqstp->rq_arg.len = len; |
553 | ||
95756482 | 554 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 555 | |
7702ce40 | 556 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
557 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
558 | cmh->cmsg_level, cmh->cmsg_type); | |
f23abfdb | 559 | goto out_free; |
7a37f578 | 560 | } |
849a1cf1 | 561 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
562 | |
563 | if (skb_is_nonlinear(skb)) { | |
564 | /* we have to copy */ | |
565 | local_bh_disable(); | |
566 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
567 | local_bh_enable(); | |
568 | /* checksum error */ | |
22911fc5 | 569 | goto out_free; |
1da177e4 LT |
570 | } |
571 | local_bh_enable(); | |
850cbadd | 572 | consume_skb(skb); |
1da177e4 LT |
573 | } else { |
574 | /* we can use it in-place */ | |
1da8c681 | 575 | rqstp->rq_arg.head[0].iov_base = skb->data; |
1da177e4 | 576 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
577 | if (skb_checksum_complete(skb)) |
578 | goto out_free; | |
5148bf4e | 579 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
580 | } |
581 | ||
582 | rqstp->rq_arg.page_base = 0; | |
583 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
584 | rqstp->rq_arg.head[0].iov_len = len; | |
585 | rqstp->rq_arg.page_len = 0; | |
44524359 | 586 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
587 | } else { |
588 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 589 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 590 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 | 591 | } |
afc59400 | 592 | rqstp->rq_next_page = rqstp->rq_respages+1; |
1da177e4 LT |
593 | |
594 | if (serv->sv_stats) | |
595 | serv->sv_stats->netudpcnt++; | |
596 | ||
597 | return len; | |
f23abfdb | 598 | out_free: |
850cbadd | 599 | kfree_skb(skb); |
f23abfdb | 600 | return 0; |
1da177e4 LT |
601 | } |
602 | ||
603 | static int | |
604 | svc_udp_sendto(struct svc_rqst *rqstp) | |
605 | { | |
606 | int error; | |
607 | ||
608 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
609 | if (error == -ECONNREFUSED) | |
610 | /* ICMP error on earlier request. */ | |
611 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
612 | ||
613 | return error; | |
614 | } | |
615 | ||
323bee32 TT |
616 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
617 | { | |
618 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 619 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
620 | unsigned long required; |
621 | ||
622 | /* | |
623 | * Set the SOCK_NOSPACE flag before checking the available | |
624 | * sock space. | |
625 | */ | |
626 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 627 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
628 | if (required*2 > sock_wspace(svsk->sk_sk)) |
629 | return 0; | |
630 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
631 | return 1; | |
632 | } | |
633 | ||
38a417cc TT |
634 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
635 | { | |
636 | BUG(); | |
637 | return NULL; | |
638 | } | |
639 | ||
ea08e392 SM |
640 | static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt) |
641 | { | |
642 | } | |
643 | ||
b700cbb1 | 644 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 645 | struct net *net, |
b700cbb1 TT |
646 | struct sockaddr *sa, int salen, |
647 | int flags) | |
648 | { | |
62832c03 | 649 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
650 | } |
651 | ||
2412e927 | 652 | static const struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 653 | .xpo_create = svc_udp_create, |
5d137990 TT |
654 | .xpo_recvfrom = svc_udp_recvfrom, |
655 | .xpo_sendto = svc_udp_sendto, | |
850cbadd | 656 | .xpo_release_rqst = svc_release_udp_skb, |
755cceab TT |
657 | .xpo_detach = svc_sock_detach, |
658 | .xpo_free = svc_sock_free, | |
323bee32 | 659 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 660 | .xpo_accept = svc_udp_accept, |
16e4d93f | 661 | .xpo_secure_port = svc_sock_secure_port, |
ea08e392 | 662 | .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt, |
360d8738 TT |
663 | }; |
664 | ||
665 | static struct svc_xprt_class svc_udp_class = { | |
666 | .xcl_name = "udp", | |
b700cbb1 | 667 | .xcl_owner = THIS_MODULE, |
360d8738 | 668 | .xcl_ops = &svc_udp_ops, |
49023155 | 669 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
3c45ddf8 | 670 | .xcl_ident = XPRT_TRANSPORT_UDP, |
360d8738 TT |
671 | }; |
672 | ||
bb5cf160 | 673 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 674 | { |
7702ce40 | 675 | int err, level, optname, one = 1; |
7a37f578 | 676 | |
bd4620dd SK |
677 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
678 | &svsk->sk_xprt, serv); | |
def13d74 | 679 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
fa9251af | 680 | svsk->sk_sk->sk_data_ready = svc_data_ready; |
1da177e4 | 681 | svsk->sk_sk->sk_write_space = svc_write_space; |
1da177e4 LT |
682 | |
683 | /* initialise setting must have enough space to | |
cca5172a | 684 | * receive and respond to one request. |
1da177e4 LT |
685 | * svc_udp_recvfrom will re-adjust if necessary |
686 | */ | |
b7e5034c | 687 | svc_sock_setbufsize(svsk, 3); |
1da177e4 | 688 | |
0f0257ea TT |
689 | /* data might have come in before data_ready set up */ |
690 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 691 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 692 | |
7a37f578 | 693 | /* make sure we get destination address info */ |
7702ce40 CL |
694 | switch (svsk->sk_sk->sk_family) { |
695 | case AF_INET: | |
696 | level = SOL_IP; | |
697 | optname = IP_PKTINFO; | |
698 | break; | |
699 | case AF_INET6: | |
700 | level = SOL_IPV6; | |
701 | optname = IPV6_RECVPKTINFO; | |
702 | break; | |
703 | default: | |
704 | BUG(); | |
705 | } | |
706 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
707 | (char *)&one, sizeof(one)); | |
708 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
709 | } |
710 | ||
711 | /* | |
712 | * A data_ready event on a listening socket means there's a connection | |
713 | * pending. Do not use state_change as a substitute for it. | |
714 | */ | |
676d2369 | 715 | static void svc_tcp_listen_data_ready(struct sock *sk) |
1da177e4 | 716 | { |
939bb7ef | 717 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
718 | |
719 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 720 | sk, sk->sk_state); |
1da177e4 | 721 | |
eebe53e8 VL |
722 | if (svsk) { |
723 | /* Refer to svc_setup_socket() for details. */ | |
724 | rmb(); | |
fa9251af | 725 | svsk->sk_odata(sk); |
eebe53e8 VL |
726 | } |
727 | ||
939bb7ef NB |
728 | /* |
729 | * This callback may called twice when a new connection | |
730 | * is established as a child socket inherits everything | |
731 | * from a parent LISTEN socket. | |
732 | * 1) data_ready method of the parent socket will be called | |
733 | * when one of child sockets become ESTABLISHED. | |
734 | * 2) data_ready method of the child socket may be called | |
735 | * when it receives data before the socket is accepted. | |
736 | * In case of 2, we should ignore it silently. | |
737 | */ | |
738 | if (sk->sk_state == TCP_LISTEN) { | |
739 | if (svsk) { | |
02fc6c36 | 740 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 741 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
742 | } else |
743 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 744 | } |
1da177e4 LT |
745 | } |
746 | ||
747 | /* | |
748 | * A state change on a connected socket means it's dying or dead. | |
749 | */ | |
0f0257ea | 750 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 751 | { |
939bb7ef | 752 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
753 | |
754 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 755 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 756 | |
939bb7ef | 757 | if (!svsk) |
1da177e4 | 758 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 759 | else { |
eebe53e8 VL |
760 | /* Refer to svc_setup_socket() for details. */ |
761 | rmb(); | |
fa9251af | 762 | svsk->sk_ostate(sk); |
b2f21f7d TM |
763 | if (sk->sk_state != TCP_ESTABLISHED) { |
764 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
765 | svc_xprt_enqueue(&svsk->sk_xprt); | |
766 | } | |
1da177e4 | 767 | } |
1da177e4 LT |
768 | } |
769 | ||
770 | /* | |
771 | * Accept a TCP connection | |
772 | */ | |
38a417cc | 773 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 774 | { |
38a417cc | 775 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f | 776 | struct sockaddr_storage addr; |
777 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 778 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
779 | struct socket *sock = svsk->sk_sock; |
780 | struct socket *newsock; | |
1da177e4 LT |
781 | struct svc_sock *newsvsk; |
782 | int err, slen; | |
5216a8e7 | 783 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
784 | |
785 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
786 | if (!sock) | |
38a417cc | 787 | return NULL; |
1da177e4 | 788 | |
02fc6c36 | 789 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
790 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
791 | if (err < 0) { | |
1da177e4 LT |
792 | if (err == -ENOMEM) |
793 | printk(KERN_WARNING "%s: no more sockets!\n", | |
794 | serv->sv_name); | |
e87cc472 JP |
795 | else if (err != -EAGAIN) |
796 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
797 | serv->sv_name, -err); | |
38a417cc | 798 | return NULL; |
1da177e4 | 799 | } |
02fc6c36 | 800 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 801 | |
9b2c45d4 | 802 | err = kernel_getpeername(newsock, sin); |
1da177e4 | 803 | if (err < 0) { |
e87cc472 JP |
804 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
805 | serv->sv_name, -err); | |
1da177e4 LT |
806 | goto failed; /* aborted connection or whatever */ |
807 | } | |
9b2c45d4 | 808 | slen = err; |
1da177e4 LT |
809 | |
810 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
811 | * hosts here, but when we get encryption, the IP of the host won't |
812 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 813 | */ |
cdd88b9f | 814 | if (!svc_port_is_privileged(sin)) { |
a48fd0f9 | 815 | dprintk("%s: connect from unprivileged port: %s\n", |
cca5172a | 816 | serv->sv_name, |
cdd88b9f | 817 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 818 | } |
ad06e4bd | 819 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 820 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 821 | |
fa9251af TM |
822 | /* Reset the inherited callbacks before calling svc_setup_socket */ |
823 | newsock->sk->sk_state_change = svsk->sk_ostate; | |
824 | newsock->sk->sk_data_ready = svsk->sk_odata; | |
825 | newsock->sk->sk_write_space = svsk->sk_owspace; | |
826 | ||
1da177e4 LT |
827 | /* make sure that a write doesn't block forever when |
828 | * low on memory | |
829 | */ | |
830 | newsock->sk->sk_sndtimeo = HZ*30; | |
831 | ||
72c35376 BF |
832 | newsvsk = svc_setup_socket(serv, newsock, |
833 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
834 | if (IS_ERR(newsvsk)) | |
1da177e4 | 835 | goto failed; |
9dbc240f | 836 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
9b2c45d4 DV |
837 | err = kernel_getsockname(newsock, sin); |
838 | slen = err; | |
a9747692 FM |
839 | if (unlikely(err < 0)) { |
840 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
841 | slen = offsetof(struct sockaddr, sa_data); | |
842 | } | |
9dbc240f | 843 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 844 | |
ef11ce24 N |
845 | if (sock_is_loopback(newsock->sk)) |
846 | set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
847 | else | |
848 | clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
f9f3cc4f TT |
849 | if (serv->sv_stats) |
850 | serv->sv_stats->nettcpconn++; | |
851 | ||
852 | return &newsvsk->sk_xprt; | |
853 | ||
854 | failed: | |
855 | sock_release(newsock); | |
856 | return NULL; | |
857 | } | |
858 | ||
31d68ef6 BF |
859 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
860 | { | |
861 | unsigned int i, len, npages; | |
862 | ||
8af345f5 | 863 | if (svsk->sk_datalen == 0) |
31d68ef6 | 864 | return 0; |
8af345f5 | 865 | len = svsk->sk_datalen; |
31d68ef6 BF |
866 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
867 | for (i = 0; i < npages; i++) { | |
868 | if (rqstp->rq_pages[i] != NULL) | |
869 | put_page(rqstp->rq_pages[i]); | |
870 | BUG_ON(svsk->sk_pages[i] == NULL); | |
871 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
872 | svsk->sk_pages[i] = NULL; | |
873 | } | |
874 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
875 | return len; | |
876 | } | |
877 | ||
878 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
879 | { | |
880 | unsigned int i, len, npages; | |
881 | ||
8af345f5 | 882 | if (svsk->sk_datalen == 0) |
31d68ef6 | 883 | return; |
8af345f5 | 884 | len = svsk->sk_datalen; |
31d68ef6 BF |
885 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
886 | for (i = 0; i < npages; i++) { | |
887 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
888 | rqstp->rq_pages[i] = NULL; | |
889 | } | |
890 | } | |
891 | ||
892 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
893 | { | |
894 | unsigned int i, len, npages; | |
895 | ||
8af345f5 | 896 | if (svsk->sk_datalen == 0) |
31d68ef6 | 897 | goto out; |
8af345f5 | 898 | len = svsk->sk_datalen; |
31d68ef6 BF |
899 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
900 | for (i = 0; i < npages; i++) { | |
cf3aa02c BF |
901 | if (svsk->sk_pages[i] == NULL) { |
902 | WARN_ON_ONCE(1); | |
903 | continue; | |
904 | } | |
31d68ef6 BF |
905 | put_page(svsk->sk_pages[i]); |
906 | svsk->sk_pages[i] = NULL; | |
907 | } | |
908 | out: | |
909 | svsk->sk_tcplen = 0; | |
8af345f5 | 910 | svsk->sk_datalen = 0; |
31d68ef6 BF |
911 | } |
912 | ||
1da177e4 | 913 | /* |
ad46ccf0 | 914 | * Receive fragment record header. |
8f55f3c0 | 915 | * If we haven't gotten the record length yet, get the next four bytes. |
1da177e4 | 916 | */ |
8f55f3c0 | 917 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 918 | { |
bb5cf160 | 919 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 920 | unsigned int want; |
8f55f3c0 | 921 | int len; |
1da177e4 | 922 | |
c0401ea0 | 923 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
924 | struct kvec iov; |
925 | ||
5ee78d48 | 926 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
927 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
928 | iov.iov_len = want; | |
4c8e5537 TM |
929 | len = svc_recvfrom(rqstp, &iov, 1, want, 0); |
930 | if (len < 0) | |
1da177e4 LT |
931 | goto error; |
932 | svsk->sk_tcplen += len; | |
933 | ||
934 | if (len < want) { | |
c0401ea0 CL |
935 | dprintk("svc: short recvfrom while reading record " |
936 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 937 | return -EAGAIN; |
1da177e4 LT |
938 | } |
939 | ||
cc248d4b | 940 | dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); |
836fbadb BF |
941 | if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
942 | serv->sv_max_mesg) { | |
3a28e331 BF |
943 | net_notice_ratelimited("RPC: fragment too large: %d\n", |
944 | svc_sock_reclen(svsk)); | |
1da177e4 LT |
945 | goto err_delete; |
946 | } | |
947 | } | |
948 | ||
cc248d4b | 949 | return svc_sock_reclen(svsk); |
31d68ef6 BF |
950 | error: |
951 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 952 | return len; |
31d68ef6 | 953 | err_delete: |
8f55f3c0 | 954 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
955 | return -EAGAIN; |
956 | } | |
957 | ||
586c52cc | 958 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 959 | { |
586c52cc | 960 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 961 | struct rpc_rqst *req = NULL; |
586c52cc TM |
962 | struct kvec *src, *dst; |
963 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
964 | __be32 xid; |
965 | __be32 calldir; | |
4cfc7e60 | 966 | |
4cfc7e60 RI |
967 | xid = *p++; |
968 | calldir = *p; | |
969 | ||
093a1468 | 970 | if (!bc_xprt) |
586c52cc | 971 | return -EAGAIN; |
75c84151 | 972 | spin_lock(&bc_xprt->queue_lock); |
093a1468 TM |
973 | req = xprt_lookup_rqst(bc_xprt, xid); |
974 | if (!req) | |
975 | goto unlock_notfound; | |
586c52cc TM |
976 | |
977 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
978 | /* | |
979 | * XXX!: cheating for now! Only copying HEAD. | |
980 | * But we know this is good enough for now (in fact, for any | |
981 | * callback reply in the forseeable future). | |
982 | */ | |
983 | dst = &req->rq_private_buf.head[0]; | |
984 | src = &rqstp->rq_arg.head[0]; | |
985 | if (dst->iov_len < src->iov_len) | |
093a1468 | 986 | goto unlock_eagain; /* whatever; just giving up. */ |
586c52cc | 987 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
cc248d4b | 988 | xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
586c52cc | 989 | rqstp->rq_arg.len = 0; |
75c84151 | 990 | spin_unlock(&bc_xprt->queue_lock); |
586c52cc | 991 | return 0; |
093a1468 TM |
992 | unlock_notfound: |
993 | printk(KERN_NOTICE | |
994 | "%s: Got unrecognized reply: " | |
995 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
996 | __func__, ntohl(calldir), | |
997 | bc_xprt, ntohl(xid)); | |
998 | unlock_eagain: | |
75c84151 | 999 | spin_unlock(&bc_xprt->queue_lock); |
093a1468 | 1000 | return -EAGAIN; |
586c52cc TM |
1001 | } |
1002 | ||
1003 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1004 | { | |
1005 | int i = 0; | |
1006 | int t = 0; | |
1007 | ||
1008 | while (t < len) { | |
1009 | vec[i].iov_base = page_address(pages[i]); | |
1010 | vec[i].iov_len = PAGE_SIZE; | |
1011 | i++; | |
1012 | t += PAGE_SIZE; | |
1013 | } | |
1014 | return i; | |
4cfc7e60 RI |
1015 | } |
1016 | ||
836fbadb BF |
1017 | static void svc_tcp_fragment_received(struct svc_sock *svsk) |
1018 | { | |
1019 | /* If we have more data, signal svc_xprt_enqueue() to try again */ | |
836fbadb BF |
1020 | dprintk("svc: TCP %s record (%d bytes)\n", |
1021 | svc_sock_final_rec(svsk) ? "final" : "nonfinal", | |
1022 | svc_sock_reclen(svsk)); | |
1023 | svsk->sk_tcplen = 0; | |
1024 | svsk->sk_reclen = 0; | |
1025 | } | |
31d68ef6 | 1026 | |
8f55f3c0 AB |
1027 | /* |
1028 | * Receive data from a TCP socket. | |
1029 | */ | |
1030 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1031 | { | |
1032 | struct svc_sock *svsk = | |
1033 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1034 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1035 | int len; | |
1036 | struct kvec *vec; | |
31d68ef6 | 1037 | unsigned int want, base; |
586c52cc TM |
1038 | __be32 *p; |
1039 | __be32 calldir; | |
5ee78d48 | 1040 | int pnum; |
8f55f3c0 AB |
1041 | |
1042 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1043 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1044 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1045 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1046 | ||
1047 | len = svc_tcp_recv_record(svsk, rqstp); | |
1048 | if (len < 0) | |
1049 | goto error; | |
1050 | ||
31d68ef6 | 1051 | base = svc_tcp_restore_pages(svsk, rqstp); |
836fbadb | 1052 | want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
31d68ef6 | 1053 | |
3cc03b16 | 1054 | vec = rqstp->rq_vec; |
4cfc7e60 | 1055 | |
4c8e5537 | 1056 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], base + want); |
586c52cc | 1057 | |
44524359 | 1058 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
afc59400 | 1059 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
1da177e4 LT |
1060 | |
1061 | /* Now receive data */ | |
4c8e5537 | 1062 | len = svc_recvfrom(rqstp, vec, pnum, base + want, base); |
8af345f5 | 1063 | if (len >= 0) { |
31d68ef6 | 1064 | svsk->sk_tcplen += len; |
8af345f5 BF |
1065 | svsk->sk_datalen += len; |
1066 | } | |
836fbadb | 1067 | if (len != want || !svc_sock_final_rec(svsk)) { |
be1e4444 | 1068 | svc_tcp_save_pages(svsk, rqstp); |
31d68ef6 | 1069 | if (len < 0 && len != -EAGAIN) |
ad46ccf0 | 1070 | goto err_delete; |
836fbadb BF |
1071 | if (len == want) |
1072 | svc_tcp_fragment_received(svsk); | |
1073 | else | |
3a28e331 BF |
1074 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
1075 | (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), | |
836fbadb | 1076 | svc_sock_reclen(svsk)); |
31d68ef6 BF |
1077 | goto err_noclose; |
1078 | } | |
1da177e4 | 1079 | |
1f691b07 | 1080 | if (svsk->sk_datalen < 8) { |
cf3aa02c | 1081 | svsk->sk_datalen = 0; |
ad46ccf0 | 1082 | goto err_delete; /* client is nuts. */ |
cf3aa02c | 1083 | } |
ad46ccf0 | 1084 | |
836fbadb | 1085 | rqstp->rq_arg.len = svsk->sk_datalen; |
1da177e4 | 1086 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1087 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1088 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1089 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1090 | } else |
1091 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1092 | |
5148bf4e | 1093 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 | 1094 | rqstp->rq_prot = IPPROTO_TCP; |
7501cc2b JL |
1095 | if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
1096 | set_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1097 | else | |
1098 | clear_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1da177e4 | 1099 | |
586c52cc TM |
1100 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1101 | calldir = p[1]; | |
8985ef0b | 1102 | if (calldir) |
586c52cc | 1103 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1104 | |
1da177e4 | 1105 | /* Reset TCP read info */ |
8af345f5 | 1106 | svsk->sk_datalen = 0; |
836fbadb | 1107 | svc_tcp_fragment_received(svsk); |
0601f793 | 1108 | |
8985ef0b BF |
1109 | if (len < 0) |
1110 | goto error; | |
1da177e4 | 1111 | |
9dbc240f | 1112 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1113 | if (serv->sv_stats) |
1114 | serv->sv_stats->nettcpcnt++; | |
1115 | ||
5ee78d48 | 1116 | return rqstp->rq_arg.len; |
1da177e4 | 1117 | |
8f55f3c0 | 1118 | error: |
31d68ef6 | 1119 | if (len != -EAGAIN) |
ad46ccf0 | 1120 | goto err_delete; |
31d68ef6 | 1121 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
9f9d2ebe | 1122 | return 0; |
ad46ccf0 | 1123 | err_delete: |
31d68ef6 BF |
1124 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
1125 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1126 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1127 | err_noclose: | |
9f9d2ebe | 1128 | return 0; /* record not complete */ |
1da177e4 LT |
1129 | } |
1130 | ||
1131 | /* | |
1132 | * Send out data on TCP socket. | |
1133 | */ | |
0f0257ea | 1134 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1135 | { |
1136 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1137 | int sent; | |
d8ed029d | 1138 | __be32 reclen; |
1da177e4 LT |
1139 | |
1140 | /* Set up the first element of the reply kvec. | |
1141 | * Any other kvecs that may be in use have been taken | |
1142 | * care of by the server implementation itself. | |
1143 | */ | |
1144 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1145 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1146 | ||
1da177e4 LT |
1147 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1148 | if (sent != xbufp->len) { | |
0f0257ea TT |
1149 | printk(KERN_NOTICE |
1150 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1151 | "- shutting down socket\n", | |
57b1d3ba | 1152 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1153 | (sent<0)?"got error":"sent only", |
1154 | sent, xbufp->len); | |
57b1d3ba | 1155 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1156 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1157 | sent = -EAGAIN; |
1158 | } | |
1159 | return sent; | |
1160 | } | |
1161 | ||
b700cbb1 | 1162 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1163 | struct net *net, |
b700cbb1 TT |
1164 | struct sockaddr *sa, int salen, |
1165 | int flags) | |
1166 | { | |
62832c03 | 1167 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1168 | } |
1169 | ||
2412e927 | 1170 | static const struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1171 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1172 | .xpo_recvfrom = svc_tcp_recvfrom, |
1173 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1174 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1175 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1176 | .xpo_free = svc_sock_free, |
323bee32 | 1177 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1178 | .xpo_accept = svc_tcp_accept, |
16e4d93f | 1179 | .xpo_secure_port = svc_sock_secure_port, |
ea08e392 | 1180 | .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt, |
360d8738 TT |
1181 | }; |
1182 | ||
1183 | static struct svc_xprt_class svc_tcp_class = { | |
1184 | .xcl_name = "tcp", | |
b700cbb1 | 1185 | .xcl_owner = THIS_MODULE, |
360d8738 | 1186 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1187 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
3c45ddf8 | 1188 | .xcl_ident = XPRT_TRANSPORT_TCP, |
360d8738 TT |
1189 | }; |
1190 | ||
1191 | void svc_init_xprt_sock(void) | |
1192 | { | |
1193 | svc_reg_xprt_class(&svc_tcp_class); | |
1194 | svc_reg_xprt_class(&svc_udp_class); | |
1195 | } | |
1196 | ||
1197 | void svc_cleanup_xprt_sock(void) | |
1198 | { | |
1199 | svc_unreg_xprt_class(&svc_tcp_class); | |
1200 | svc_unreg_xprt_class(&svc_udp_class); | |
1201 | } | |
1202 | ||
bb5cf160 | 1203 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1204 | { |
1205 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1206 | |
bd4620dd SK |
1207 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1208 | &svsk->sk_xprt, serv); | |
def13d74 | 1209 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
362142b2 | 1210 | set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1211 | if (sk->sk_state == TCP_LISTEN) { |
1212 | dprintk("setting up TCP socket for listening\n"); | |
ece200dd | 1213 | strcpy(svsk->sk_xprt.xpt_remotebuf, "listener"); |
02fc6c36 | 1214 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1215 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1216 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1217 | } else { |
1218 | dprintk("setting up TCP socket for reading\n"); | |
1219 | sk->sk_state_change = svc_tcp_state_change; | |
fa9251af | 1220 | sk->sk_data_ready = svc_data_ready; |
637600f3 | 1221 | sk->sk_write_space = svc_write_space; |
1da177e4 LT |
1222 | |
1223 | svsk->sk_reclen = 0; | |
1224 | svsk->sk_tcplen = 0; | |
8af345f5 | 1225 | svsk->sk_datalen = 0; |
31d68ef6 | 1226 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1227 | |
b7872fe8 | 1228 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1229 | |
02fc6c36 | 1230 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
b2f21f7d TM |
1231 | switch (sk->sk_state) { |
1232 | case TCP_SYN_RECV: | |
1233 | case TCP_ESTABLISHED: | |
1234 | break; | |
1235 | default: | |
02fc6c36 | 1236 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
b2f21f7d | 1237 | } |
1da177e4 LT |
1238 | } |
1239 | } | |
1240 | ||
0f0257ea | 1241 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1242 | { |
1243 | /* | |
1244 | * The number of server threads has changed. Update | |
1245 | * rcvbuf and sndbuf accordingly on all sockets | |
1246 | */ | |
8f3a6de3 | 1247 | struct svc_sock *svsk; |
1da177e4 LT |
1248 | |
1249 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1250 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1251 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1252 | spin_unlock_bh(&serv->sv_lock); |
1253 | } | |
24c3767e | 1254 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1255 | |
1da177e4 LT |
1256 | /* |
1257 | * Initialize socket for RPC use and create svc_sock struct | |
1da177e4 | 1258 | */ |
6b174337 CL |
1259 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1260 | struct socket *sock, | |
72c35376 | 1261 | int flags) |
1da177e4 LT |
1262 | { |
1263 | struct svc_sock *svsk; | |
1264 | struct sock *inet; | |
6b174337 | 1265 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
72c35376 | 1266 | int err = 0; |
1da177e4 LT |
1267 | |
1268 | dprintk("svc: svc_setup_socket %p\n", sock); | |
72c35376 BF |
1269 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1270 | if (!svsk) | |
1271 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1272 | |
1273 | inet = sock->sk; | |
1274 | ||
1275 | /* Register socket with portmapper */ | |
72c35376 BF |
1276 | if (pmap_register) |
1277 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, | |
5247fab5 | 1278 | inet->sk_protocol, |
c720c7e8 | 1279 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 | 1280 | |
72c35376 | 1281 | if (err < 0) { |
1da177e4 | 1282 | kfree(svsk); |
72c35376 | 1283 | return ERR_PTR(err); |
1da177e4 LT |
1284 | } |
1285 | ||
1da177e4 LT |
1286 | svsk->sk_sock = sock; |
1287 | svsk->sk_sk = inet; | |
1288 | svsk->sk_ostate = inet->sk_state_change; | |
1289 | svsk->sk_odata = inet->sk_data_ready; | |
1290 | svsk->sk_owspace = inet->sk_write_space; | |
eebe53e8 VL |
1291 | /* |
1292 | * This barrier is necessary in order to prevent race condition | |
1293 | * with svc_data_ready(), svc_listen_data_ready() and others | |
1294 | * when calling callbacks above. | |
1295 | */ | |
1296 | wmb(); | |
1297 | inet->sk_user_data = svsk; | |
1da177e4 LT |
1298 | |
1299 | /* Initialize the socket */ | |
1300 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1301 | svc_udp_init(svsk, serv); |
637600f3 | 1302 | else |
bb5cf160 | 1303 | svc_tcp_init(svsk, serv); |
1da177e4 | 1304 | |
c7995f8a TM |
1305 | dprintk("svc: svc_setup_socket created %p (inet %p), " |
1306 | "listen %d close %d\n", | |
1307 | svsk, svsk->sk_sk, | |
1308 | test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags), | |
1309 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1da177e4 | 1310 | |
1da177e4 LT |
1311 | return svsk; |
1312 | } | |
1313 | ||
30646394 SK |
1314 | bool svc_alien_sock(struct net *net, int fd) |
1315 | { | |
1316 | int err; | |
1317 | struct socket *sock = sockfd_lookup(fd, &err); | |
1318 | bool ret = false; | |
1319 | ||
1320 | if (!sock) | |
1321 | goto out; | |
1322 | if (sock_net(sock->sk) != net) | |
1323 | ret = true; | |
1324 | sockfd_put(sock); | |
1325 | out: | |
1326 | return ret; | |
1327 | } | |
1328 | EXPORT_SYMBOL_GPL(svc_alien_sock); | |
1329 | ||
bfba9ab4 CL |
1330 | /** |
1331 | * svc_addsock - add a listener socket to an RPC service | |
1332 | * @serv: pointer to RPC service to which to add a new listener | |
1333 | * @fd: file descriptor of the new listener | |
1334 | * @name_return: pointer to buffer to fill in with name of listener | |
1335 | * @len: size of the buffer | |
4df493a2 | 1336 | * @cred: credential |
bfba9ab4 CL |
1337 | * |
1338 | * Fills in socket name and returns positive length of name if successful. | |
1339 | * Name is terminated with '\n'. On error, returns a negative errno | |
1340 | * value. | |
1341 | */ | |
1342 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
4df493a2 | 1343 | const size_t len, const struct cred *cred) |
b41b66d6 N |
1344 | { |
1345 | int err = 0; | |
1346 | struct socket *so = sockfd_lookup(fd, &err); | |
1347 | struct svc_sock *svsk = NULL; | |
a8e10078 BF |
1348 | struct sockaddr_storage addr; |
1349 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1350 | int salen; | |
b41b66d6 N |
1351 | |
1352 | if (!so) | |
1353 | return err; | |
a8e10078 | 1354 | err = -EAFNOSUPPORT; |
205ba423 | 1355 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
a8e10078 BF |
1356 | goto out; |
1357 | err = -EPROTONOSUPPORT; | |
1358 | if (so->sk->sk_protocol != IPPROTO_TCP && | |
b41b66d6 | 1359 | so->sk->sk_protocol != IPPROTO_UDP) |
a8e10078 BF |
1360 | goto out; |
1361 | err = -EISCONN; | |
1362 | if (so->state > SS_UNCONNECTED) | |
1363 | goto out; | |
1364 | err = -ENOENT; | |
1365 | if (!try_module_get(THIS_MODULE)) | |
1366 | goto out; | |
1367 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); | |
1368 | if (IS_ERR(svsk)) { | |
1369 | module_put(THIS_MODULE); | |
1370 | err = PTR_ERR(svsk); | |
1371 | goto out; | |
b41b66d6 | 1372 | } |
9b2c45d4 DV |
1373 | salen = kernel_getsockname(svsk->sk_sock, sin); |
1374 | if (salen >= 0) | |
a8e10078 | 1375 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); |
4df493a2 | 1376 | svsk->sk_xprt.xpt_cred = get_cred(cred); |
39b55301 | 1377 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
e7942b9f | 1378 | return svc_one_sock_name(svsk, name_return, len); |
a8e10078 BF |
1379 | out: |
1380 | sockfd_put(so); | |
1381 | return err; | |
b41b66d6 N |
1382 | } |
1383 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1384 | ||
1da177e4 LT |
1385 | /* |
1386 | * Create socket for RPC service. | |
1387 | */ | |
b700cbb1 TT |
1388 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1389 | int protocol, | |
62832c03 | 1390 | struct net *net, |
b700cbb1 TT |
1391 | struct sockaddr *sin, int len, |
1392 | int flags) | |
1da177e4 LT |
1393 | { |
1394 | struct svc_sock *svsk; | |
1395 | struct socket *sock; | |
1396 | int error; | |
1397 | int type; | |
9dbc240f TT |
1398 | struct sockaddr_storage addr; |
1399 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1400 | int newlen; | |
c69da774 TM |
1401 | int family; |
1402 | int val; | |
5216a8e7 | 1403 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1404 | |
ad06e4bd CL |
1405 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1406 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1407 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1408 | |
1409 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1410 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1411 | "sockets supported\n"); | |
b700cbb1 | 1412 | return ERR_PTR(-EINVAL); |
1da177e4 | 1413 | } |
c69da774 | 1414 | |
1da177e4 | 1415 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1416 | switch (sin->sa_family) { |
1417 | case AF_INET6: | |
1418 | family = PF_INET6; | |
1419 | break; | |
1420 | case AF_INET: | |
1421 | family = PF_INET; | |
1422 | break; | |
1423 | default: | |
1424 | return ERR_PTR(-EINVAL); | |
1425 | } | |
1da177e4 | 1426 | |
14ec63c3 | 1427 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1428 | if (error < 0) |
b700cbb1 | 1429 | return ERR_PTR(error); |
1da177e4 | 1430 | |
ed07536e PZ |
1431 | svc_reclassify_socket(sock); |
1432 | ||
c69da774 TM |
1433 | /* |
1434 | * If this is an PF_INET6 listener, we want to avoid | |
1435 | * getting requests from IPv4 remotes. Those should | |
1436 | * be shunted to a PF_INET listener via rpcbind. | |
1437 | */ | |
1438 | val = 1; | |
1439 | if (family == PF_INET6) | |
1440 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1441 | (char *)&val, sizeof(val)); | |
1442 | ||
18114746 | 1443 | if (type == SOCK_STREAM) |
4a17fd52 | 1444 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
77f1f67a | 1445 | error = kernel_bind(sock, sin, len); |
18114746 ES |
1446 | if (error < 0) |
1447 | goto bummer; | |
1da177e4 | 1448 | |
9b2c45d4 | 1449 | error = kernel_getsockname(sock, newsin); |
9dbc240f TT |
1450 | if (error < 0) |
1451 | goto bummer; | |
9b2c45d4 | 1452 | newlen = error; |
9dbc240f | 1453 | |
1da177e4 | 1454 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1455 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1456 | goto bummer; |
1457 | } | |
1458 | ||
72c35376 | 1459 | svsk = svc_setup_socket(serv, sock, flags); |
a8e10078 BF |
1460 | if (IS_ERR(svsk)) { |
1461 | error = PTR_ERR(svsk); | |
1462 | goto bummer; | |
e79eff1f | 1463 | } |
a8e10078 BF |
1464 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
1465 | return (struct svc_xprt *)svsk; | |
1da177e4 LT |
1466 | bummer: |
1467 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1468 | sock_release(sock); | |
b700cbb1 | 1469 | return ERR_PTR(error); |
1da177e4 LT |
1470 | } |
1471 | ||
755cceab TT |
1472 | /* |
1473 | * Detach the svc_sock from the socket so that no | |
1474 | * more callbacks occur. | |
1475 | */ | |
1476 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1477 | { | |
1478 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1479 | struct sock *sk = svsk->sk_sk; | |
1480 | ||
1481 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1482 | ||
1483 | /* put back the old socket callbacks */ | |
069c225b | 1484 | lock_sock(sk); |
755cceab TT |
1485 | sk->sk_state_change = svsk->sk_ostate; |
1486 | sk->sk_data_ready = svsk->sk_odata; | |
1487 | sk->sk_write_space = svsk->sk_owspace; | |
069c225b TM |
1488 | sk->sk_user_data = NULL; |
1489 | release_sock(sk); | |
69b6ba37 TM |
1490 | } |
1491 | ||
1492 | /* | |
1493 | * Disconnect the socket, and reset the callbacks | |
1494 | */ | |
1495 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1496 | { | |
1497 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1498 | ||
1499 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1500 | ||
1501 | svc_sock_detach(xprt); | |
1502 | ||
31d68ef6 BF |
1503 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1504 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1505 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1506 | } |
755cceab TT |
1507 | } |
1508 | ||
1509 | /* | |
1510 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1511 | */ | |
1512 | static void svc_sock_free(struct svc_xprt *xprt) | |
1513 | { | |
1514 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1515 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1516 | ||
755cceab TT |
1517 | if (svsk->sk_sock->file) |
1518 | sockfd_put(svsk->sk_sock); | |
1519 | else | |
1520 | sock_release(svsk->sk_sock); | |
1521 | kfree(svsk); | |
1522 | } |