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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/svcsock.c | |
3 | * | |
4 | * These are the RPC server socket internals. | |
5 | * | |
6 | * The server scheduling algorithm does not always distribute the load | |
7 | * evenly when servicing a single client. May need to modify the | |
f6150c3c | 8 | * svc_xprt_enqueue procedure... |
1da177e4 LT |
9 | * |
10 | * TCP support is largely untested and may be a little slow. The problem | |
11 | * is that we currently do two separate recvfrom's, one for the 4-byte | |
12 | * record length, and the second for the actual record. This could possibly | |
13 | * be improved by always reading a minimum size of around 100 bytes and | |
14 | * tucking any superfluous bytes away in a temporary store. Still, that | |
15 | * leaves write requests out in the rain. An alternative may be to peek at | |
16 | * the first skb in the queue, and if it matches the next TCP sequence | |
17 | * number, to extract the record marker. Yuck. | |
18 | * | |
19 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
20 | */ | |
21 | ||
172589cc | 22 | #include <linux/kernel.h> |
1da177e4 | 23 | #include <linux/sched.h> |
3a9a231d | 24 | #include <linux/module.h> |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/fcntl.h> | |
27 | #include <linux/net.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/inet.h> | |
30 | #include <linux/udp.h> | |
91483c4b | 31 | #include <linux/tcp.h> |
1da177e4 LT |
32 | #include <linux/unistd.h> |
33 | #include <linux/slab.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/skbuff.h> | |
b41b66d6 | 36 | #include <linux/file.h> |
7dfb7103 | 37 | #include <linux/freezer.h> |
1da177e4 LT |
38 | #include <net/sock.h> |
39 | #include <net/checksum.h> | |
40 | #include <net/ip.h> | |
b92503b2 | 41 | #include <net/ipv6.h> |
850cbadd | 42 | #include <net/udp.h> |
b7872fe8 | 43 | #include <net/tcp.h> |
c752f073 | 44 | #include <net/tcp_states.h> |
7c0f6ba6 | 45 | #include <linux/uaccess.h> |
1da177e4 | 46 | #include <asm/ioctls.h> |
22911fc5 | 47 | #include <trace/events/skb.h> |
1da177e4 LT |
48 | |
49 | #include <linux/sunrpc/types.h> | |
ad06e4bd | 50 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 51 | #include <linux/sunrpc/xdr.h> |
c0401ea0 | 52 | #include <linux/sunrpc/msg_prot.h> |
1da177e4 LT |
53 | #include <linux/sunrpc/svcsock.h> |
54 | #include <linux/sunrpc/stats.h> | |
4cfc7e60 | 55 | #include <linux/sunrpc/xprt.h> |
1da177e4 | 56 | |
177e4f99 HS |
57 | #include "sunrpc.h" |
58 | ||
360d8738 | 59 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
1da177e4 LT |
60 | |
61 | ||
62 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
72c35376 | 63 | int flags); |
1da177e4 LT |
64 | static int svc_udp_recvfrom(struct svc_rqst *); |
65 | static int svc_udp_sendto(struct svc_rqst *); | |
755cceab | 66 | static void svc_sock_detach(struct svc_xprt *); |
69b6ba37 | 67 | static void svc_tcp_sock_detach(struct svc_xprt *); |
755cceab | 68 | static void svc_sock_free(struct svc_xprt *); |
1da177e4 | 69 | |
b700cbb1 | 70 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
62832c03 PE |
71 | struct net *, struct sockaddr *, |
72 | int, int); | |
ed07536e PZ |
73 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
74 | static struct lock_class_key svc_key[2]; | |
75 | static struct lock_class_key svc_slock_key[2]; | |
76 | ||
0f0257ea | 77 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
78 | { |
79 | struct sock *sk = sock->sk; | |
1b7a1819 | 80 | |
fafc4e1e | 81 | if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) |
1b7a1819 WAA |
82 | return; |
83 | ||
ed07536e PZ |
84 | switch (sk->sk_family) { |
85 | case AF_INET: | |
86 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
def13d74 TT |
87 | &svc_slock_key[0], |
88 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
89 | &svc_key[0]); | |
ed07536e PZ |
90 | break; |
91 | ||
92 | case AF_INET6: | |
93 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
def13d74 TT |
94 | &svc_slock_key[1], |
95 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
96 | &svc_key[1]); | |
ed07536e PZ |
97 | break; |
98 | ||
99 | default: | |
100 | BUG(); | |
101 | } | |
102 | } | |
103 | #else | |
0f0257ea | 104 | static void svc_reclassify_socket(struct socket *sock) |
ed07536e PZ |
105 | { |
106 | } | |
107 | #endif | |
108 | ||
1da177e4 LT |
109 | /* |
110 | * Release an skbuff after use | |
111 | */ | |
5148bf4e | 112 | static void svc_release_skb(struct svc_rqst *rqstp) |
1da177e4 | 113 | { |
5148bf4e | 114 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
1da177e4 LT |
115 | |
116 | if (skb) { | |
57b1d3ba TT |
117 | struct svc_sock *svsk = |
118 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
5148bf4e | 119 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 LT |
120 | |
121 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
9d410c79 | 122 | skb_free_datagram_locked(svsk->sk_sk, skb); |
1da177e4 | 123 | } |
1da177e4 LT |
124 | } |
125 | ||
850cbadd PA |
126 | static void svc_release_udp_skb(struct svc_rqst *rqstp) |
127 | { | |
128 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; | |
129 | ||
130 | if (skb) { | |
131 | rqstp->rq_xprt_ctxt = NULL; | |
132 | ||
133 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
134 | consume_skb(skb); | |
135 | } | |
136 | } | |
137 | ||
b92503b2 CL |
138 | union svc_pktinfo_u { |
139 | struct in_pktinfo pkti; | |
b92503b2 | 140 | struct in6_pktinfo pkti6; |
b92503b2 | 141 | }; |
bc375ea7 DM |
142 | #define SVC_PKTINFO_SPACE \ |
143 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
b92503b2 CL |
144 | |
145 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
146 | { | |
57b1d3ba TT |
147 | struct svc_sock *svsk = |
148 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
149 | switch (svsk->sk_sk->sk_family) { | |
b92503b2 CL |
150 | case AF_INET: { |
151 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
152 | ||
153 | cmh->cmsg_level = SOL_IP; | |
154 | cmh->cmsg_type = IP_PKTINFO; | |
155 | pki->ipi_ifindex = 0; | |
849a1cf1 MJ |
156 | pki->ipi_spec_dst.s_addr = |
157 | svc_daddr_in(rqstp)->sin_addr.s_addr; | |
b92503b2 CL |
158 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
159 | } | |
160 | break; | |
5a05ed73 | 161 | |
b92503b2 CL |
162 | case AF_INET6: { |
163 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 | 164 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
b92503b2 CL |
165 | |
166 | cmh->cmsg_level = SOL_IPV6; | |
167 | cmh->cmsg_type = IPV6_PKTINFO; | |
849a1cf1 | 168 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
4e3fd7a0 | 169 | pki->ipi6_addr = daddr->sin6_addr; |
b92503b2 CL |
170 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
171 | } | |
172 | break; | |
b92503b2 | 173 | } |
b92503b2 CL |
174 | } |
175 | ||
1da177e4 | 176 | /* |
4cfc7e60 | 177 | * send routine intended to be shared by the fore- and back-channel |
1da177e4 | 178 | */ |
4cfc7e60 RI |
179 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
180 | struct page *headpage, unsigned long headoffset, | |
181 | struct page *tailpage, unsigned long tailoffset) | |
1da177e4 | 182 | { |
1da177e4 LT |
183 | int result; |
184 | int size; | |
185 | struct page **ppage = xdr->pages; | |
186 | size_t base = xdr->page_base; | |
187 | unsigned int pglen = xdr->page_len; | |
226453d8 | 188 | unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST; |
4cfc7e60 RI |
189 | int slen; |
190 | int len = 0; | |
1da177e4 LT |
191 | |
192 | slen = xdr->len; | |
193 | ||
1da177e4 LT |
194 | /* send head */ |
195 | if (slen == xdr->head[0].iov_len) | |
196 | flags = 0; | |
4cfc7e60 | 197 | len = kernel_sendpage(sock, headpage, headoffset, |
44524359 | 198 | xdr->head[0].iov_len, flags); |
1da177e4 LT |
199 | if (len != xdr->head[0].iov_len) |
200 | goto out; | |
201 | slen -= xdr->head[0].iov_len; | |
202 | if (slen == 0) | |
203 | goto out; | |
204 | ||
205 | /* send page data */ | |
206 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
207 | while (pglen > 0) { | |
208 | if (slen == size) | |
209 | flags = 0; | |
e6242e92 | 210 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
1da177e4 LT |
211 | if (result > 0) |
212 | len += result; | |
213 | if (result != size) | |
214 | goto out; | |
215 | slen -= size; | |
216 | pglen -= size; | |
217 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
218 | base = 0; | |
219 | ppage++; | |
220 | } | |
4cfc7e60 | 221 | |
1da177e4 LT |
222 | /* send tail */ |
223 | if (xdr->tail[0].iov_len) { | |
4cfc7e60 RI |
224 | result = kernel_sendpage(sock, tailpage, tailoffset, |
225 | xdr->tail[0].iov_len, 0); | |
1da177e4 LT |
226 | if (result > 0) |
227 | len += result; | |
228 | } | |
4cfc7e60 RI |
229 | |
230 | out: | |
231 | return len; | |
232 | } | |
233 | ||
234 | ||
235 | /* | |
236 | * Generic sendto routine | |
237 | */ | |
238 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
239 | { | |
240 | struct svc_sock *svsk = | |
241 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
242 | struct socket *sock = svsk->sk_sock; | |
243 | union { | |
244 | struct cmsghdr hdr; | |
245 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
246 | } buffer; | |
247 | struct cmsghdr *cmh = &buffer.hdr; | |
248 | int len = 0; | |
249 | unsigned long tailoff; | |
250 | unsigned long headoff; | |
251 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
252 | ||
253 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
254 | struct msghdr msg = { | |
255 | .msg_name = &rqstp->rq_addr, | |
256 | .msg_namelen = rqstp->rq_addrlen, | |
257 | .msg_control = cmh, | |
258 | .msg_controllen = sizeof(buffer), | |
259 | .msg_flags = MSG_MORE, | |
260 | }; | |
261 | ||
262 | svc_set_cmsg_data(rqstp, cmh); | |
263 | ||
d8725c86 | 264 | if (sock_sendmsg(sock, &msg) < 0) |
4cfc7e60 RI |
265 | goto out; |
266 | } | |
267 | ||
268 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
269 | headoff = 0; | |
270 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
271 | rqstp->rq_respages[0], tailoff); | |
272 | ||
1da177e4 | 273 | out: |
5b5e0928 | 274 | dprintk("svc: socket %p sendto([%p %zu... ], %d) = %d (addr %s)\n", |
57b1d3ba | 275 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
ad06e4bd | 276 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
1da177e4 LT |
277 | |
278 | return len; | |
279 | } | |
280 | ||
80212d59 N |
281 | /* |
282 | * Report socket names for nfsdfs | |
283 | */ | |
e7942b9f | 284 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
80212d59 | 285 | { |
017cb47f CL |
286 | const struct sock *sk = svsk->sk_sk; |
287 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
288 | "udp" : "tcp"; | |
80212d59 N |
289 | int len; |
290 | ||
017cb47f | 291 | switch (sk->sk_family) { |
e7942b9f CL |
292 | case PF_INET: |
293 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
017cb47f | 294 | proto_name, |
c720c7e8 ED |
295 | &inet_sk(sk)->inet_rcv_saddr, |
296 | inet_sk(sk)->inet_num); | |
80212d59 | 297 | break; |
c2bb06db | 298 | #if IS_ENABLED(CONFIG_IPV6) |
58de2f86 CL |
299 | case PF_INET6: |
300 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
017cb47f | 301 | proto_name, |
efe4208f | 302 | &sk->sk_v6_rcv_saddr, |
c720c7e8 | 303 | inet_sk(sk)->inet_num); |
80212d59 | 304 | break; |
c2bb06db | 305 | #endif |
80212d59 | 306 | default: |
e7942b9f | 307 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
017cb47f | 308 | sk->sk_family); |
80212d59 | 309 | } |
e7942b9f CL |
310 | |
311 | if (len >= remaining) { | |
312 | *buf = '\0'; | |
313 | return -ENAMETOOLONG; | |
80212d59 N |
314 | } |
315 | return len; | |
316 | } | |
317 | ||
1da177e4 LT |
318 | /* |
319 | * Generic recvfrom routine. | |
320 | */ | |
4c8e5537 TM |
321 | static ssize_t svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, |
322 | unsigned int nr, size_t buflen, unsigned int base) | |
1da177e4 | 323 | { |
57b1d3ba TT |
324 | struct svc_sock *svsk = |
325 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
4c8e5537 TM |
326 | struct msghdr msg = { NULL }; |
327 | ssize_t len; | |
1da177e4 | 328 | |
260c1d12 TT |
329 | rqstp->rq_xprt_hlen = 0; |
330 | ||
f8d1ff47 | 331 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
aa563d7b | 332 | iov_iter_kvec(&msg.msg_iter, READ, iov, nr, buflen); |
4c8e5537 TM |
333 | if (base != 0) { |
334 | iov_iter_advance(&msg.msg_iter, base); | |
335 | buflen -= base; | |
336 | } | |
337 | len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT); | |
f8d1ff47 TM |
338 | /* If we read a full record, then assume there may be more |
339 | * data to read (stream based sockets only!) | |
340 | */ | |
341 | if (len == buflen) | |
342 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1da177e4 | 343 | |
4c8e5537 | 344 | dprintk("svc: socket %p recvfrom(%p, %zu) = %zd\n", |
1ba95105 | 345 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
1da177e4 LT |
346 | return len; |
347 | } | |
348 | ||
349 | /* | |
350 | * Set socket snd and rcv buffer lengths | |
351 | */ | |
0f0257ea TT |
352 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
353 | unsigned int rcv) | |
1da177e4 | 354 | { |
1da177e4 LT |
355 | lock_sock(sock->sk); |
356 | sock->sk->sk_sndbuf = snd * 2; | |
357 | sock->sk->sk_rcvbuf = rcv * 2; | |
47fcb03f | 358 | sock->sk->sk_write_space(sock->sk); |
1da177e4 | 359 | release_sock(sock->sk); |
1da177e4 | 360 | } |
16e4d93f | 361 | |
989f881e | 362 | static void svc_sock_secure_port(struct svc_rqst *rqstp) |
16e4d93f | 363 | { |
989f881e CL |
364 | if (svc_port_is_privileged(svc_addr(rqstp))) |
365 | set_bit(RQ_SECURE, &rqstp->rq_flags); | |
366 | else | |
367 | clear_bit(RQ_SECURE, &rqstp->rq_flags); | |
16e4d93f CL |
368 | } |
369 | ||
1da177e4 LT |
370 | /* |
371 | * INET callback when data has been received on the socket. | |
372 | */ | |
fa9251af | 373 | static void svc_data_ready(struct sock *sk) |
1da177e4 | 374 | { |
939bb7ef | 375 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 | 376 | |
939bb7ef | 377 | if (svsk) { |
676d2369 DM |
378 | dprintk("svc: socket %p(inet %p), busy=%d\n", |
379 | svsk, sk, | |
02fc6c36 | 380 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
eebe53e8 VL |
381 | |
382 | /* Refer to svc_setup_socket() for details. */ | |
383 | rmb(); | |
fa9251af | 384 | svsk->sk_odata(sk); |
4720b070 TM |
385 | if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) |
386 | svc_xprt_enqueue(&svsk->sk_xprt); | |
939bb7ef | 387 | } |
1da177e4 LT |
388 | } |
389 | ||
390 | /* | |
391 | * INET callback when space is newly available on the socket. | |
392 | */ | |
0f0257ea | 393 | static void svc_write_space(struct sock *sk) |
1da177e4 LT |
394 | { |
395 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
396 | ||
397 | if (svsk) { | |
398 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
02fc6c36 | 399 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
eebe53e8 VL |
400 | |
401 | /* Refer to svc_setup_socket() for details. */ | |
402 | rmb(); | |
fa9251af | 403 | svsk->sk_owspace(sk); |
f6150c3c | 404 | svc_xprt_enqueue(&svsk->sk_xprt); |
1da177e4 | 405 | } |
1da177e4 LT |
406 | } |
407 | ||
c7fb3f06 TM |
408 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
409 | { | |
637600f3 | 410 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
c7fb3f06 TM |
411 | |
412 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
413 | return 1; | |
637600f3 | 414 | return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
51877680 TM |
415 | } |
416 | ||
ea08e392 SM |
417 | static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt) |
418 | { | |
419 | struct svc_sock *svsk; | |
420 | struct socket *sock; | |
421 | struct linger no_linger = { | |
422 | .l_onoff = 1, | |
423 | .l_linger = 0, | |
424 | }; | |
425 | ||
426 | svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
427 | sock = svsk->sk_sock; | |
428 | kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER, | |
429 | (char *)&no_linger, sizeof(no_linger)); | |
430 | } | |
431 | ||
7702ce40 CL |
432 | /* |
433 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
434 | */ | |
435 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
436 | struct cmsghdr *cmh) | |
437 | { | |
438 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
439 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
440 | ||
7702ce40 CL |
441 | if (cmh->cmsg_type != IP_PKTINFO) |
442 | return 0; | |
849a1cf1 MJ |
443 | |
444 | daddr->sin_family = AF_INET; | |
445 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; | |
7702ce40 CL |
446 | return 1; |
447 | } | |
448 | ||
449 | /* | |
73df66f8 | 450 | * See net/ipv6/datagram.c : ip6_datagram_recv_ctl |
7702ce40 CL |
451 | */ |
452 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
453 | struct cmsghdr *cmh) | |
454 | { | |
455 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
849a1cf1 MJ |
456 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
457 | ||
7702ce40 CL |
458 | if (cmh->cmsg_type != IPV6_PKTINFO) |
459 | return 0; | |
849a1cf1 MJ |
460 | |
461 | daddr->sin6_family = AF_INET6; | |
4e3fd7a0 | 462 | daddr->sin6_addr = pki->ipi6_addr; |
849a1cf1 | 463 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
7702ce40 CL |
464 | return 1; |
465 | } | |
466 | ||
9dbc240f TT |
467 | /* |
468 | * Copy the UDP datagram's destination address to the rqstp structure. | |
469 | * The 'destination' address in this case is the address to which the | |
470 | * peer sent the datagram, i.e. our local address. For multihomed | |
471 | * hosts, this can change from msg to msg. Note that only the IP | |
472 | * address changes, the port number should remain the same. | |
473 | */ | |
7702ce40 CL |
474 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
475 | struct cmsghdr *cmh) | |
95756482 | 476 | { |
7702ce40 CL |
477 | switch (cmh->cmsg_level) { |
478 | case SOL_IP: | |
479 | return svc_udp_get_dest_address4(rqstp, cmh); | |
480 | case SOL_IPV6: | |
481 | return svc_udp_get_dest_address6(rqstp, cmh); | |
95756482 | 482 | } |
7702ce40 CL |
483 | |
484 | return 0; | |
95756482 CL |
485 | } |
486 | ||
1da177e4 LT |
487 | /* |
488 | * Receive a datagram from a UDP socket. | |
489 | */ | |
0f0257ea | 490 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
1da177e4 | 491 | { |
57b1d3ba TT |
492 | struct svc_sock *svsk = |
493 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 494 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 | 495 | struct sk_buff *skb; |
bc375ea7 DM |
496 | union { |
497 | struct cmsghdr hdr; | |
498 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
499 | } buffer; | |
500 | struct cmsghdr *cmh = &buffer.hdr; | |
7a37f578 N |
501 | struct msghdr msg = { |
502 | .msg_name = svc_addr(rqstp), | |
503 | .msg_control = cmh, | |
504 | .msg_controllen = sizeof(buffer), | |
505 | .msg_flags = MSG_DONTWAIT, | |
506 | }; | |
abc5c44d CL |
507 | size_t len; |
508 | int err; | |
1da177e4 | 509 | |
02fc6c36 | 510 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
1da177e4 LT |
511 | /* udp sockets need large rcvbuf as all pending |
512 | * requests are still in that buffer. sndbuf must | |
513 | * also be large enough that there is enough space | |
3262c816 GB |
514 | * for one reply per thread. We count all threads |
515 | * rather than threads in a particular pool, which | |
516 | * provides an upper bound on the number of threads | |
517 | * which will access the socket. | |
1da177e4 LT |
518 | */ |
519 | svc_sock_setbufsize(svsk->sk_sock, | |
c6b0a9f8 N |
520 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
521 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
1da177e4 | 522 | |
02fc6c36 | 523 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
05ed690e N |
524 | skb = NULL; |
525 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
526 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
527 | if (err >= 0) | |
7c13f97f | 528 | skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err); |
05ed690e N |
529 | |
530 | if (skb == NULL) { | |
531 | if (err != -EAGAIN) { | |
532 | /* possibly an icmp error */ | |
533 | dprintk("svc: recvfrom returned error %d\n", -err); | |
02fc6c36 | 534 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 535 | } |
9f9d2ebe | 536 | return 0; |
1da177e4 | 537 | } |
9dbc240f | 538 | len = svc_addr_len(svc_addr(rqstp)); |
9dbc240f | 539 | rqstp->rq_addrlen = len; |
2456e855 | 540 | if (skb->tstamp == 0) { |
b7aa0bf7 | 541 | skb->tstamp = ktime_get_real(); |
cca5172a | 542 | /* Don't enable netstamp, sunrpc doesn't |
1da177e4 LT |
543 | need that much accuracy */ |
544 | } | |
3a0ed3e9 | 545 | sock_write_timestamp(svsk->sk_sk, skb->tstamp); |
02fc6c36 | 546 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
1da177e4 | 547 | |
1da8c681 | 548 | len = skb->len; |
1da177e4 LT |
549 | rqstp->rq_arg.len = len; |
550 | ||
95756482 | 551 | rqstp->rq_prot = IPPROTO_UDP; |
27459f09 | 552 | |
7702ce40 | 553 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
e87cc472 JP |
554 | net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
555 | cmh->cmsg_level, cmh->cmsg_type); | |
f23abfdb | 556 | goto out_free; |
7a37f578 | 557 | } |
849a1cf1 | 558 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
1da177e4 LT |
559 | |
560 | if (skb_is_nonlinear(skb)) { | |
561 | /* we have to copy */ | |
562 | local_bh_disable(); | |
563 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
564 | local_bh_enable(); | |
565 | /* checksum error */ | |
22911fc5 | 566 | goto out_free; |
1da177e4 LT |
567 | } |
568 | local_bh_enable(); | |
850cbadd | 569 | consume_skb(skb); |
1da177e4 LT |
570 | } else { |
571 | /* we can use it in-place */ | |
1da8c681 | 572 | rqstp->rq_arg.head[0].iov_base = skb->data; |
1da177e4 | 573 | rqstp->rq_arg.head[0].iov_len = len; |
22911fc5 ED |
574 | if (skb_checksum_complete(skb)) |
575 | goto out_free; | |
5148bf4e | 576 | rqstp->rq_xprt_ctxt = skb; |
1da177e4 LT |
577 | } |
578 | ||
579 | rqstp->rq_arg.page_base = 0; | |
580 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
581 | rqstp->rq_arg.head[0].iov_len = len; | |
582 | rqstp->rq_arg.page_len = 0; | |
44524359 | 583 | rqstp->rq_respages = rqstp->rq_pages+1; |
1da177e4 LT |
584 | } else { |
585 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
44524359 | 586 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
172589cc | 587 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
1da177e4 | 588 | } |
afc59400 | 589 | rqstp->rq_next_page = rqstp->rq_respages+1; |
1da177e4 LT |
590 | |
591 | if (serv->sv_stats) | |
592 | serv->sv_stats->netudpcnt++; | |
593 | ||
594 | return len; | |
f23abfdb | 595 | out_free: |
850cbadd | 596 | kfree_skb(skb); |
f23abfdb | 597 | return 0; |
1da177e4 LT |
598 | } |
599 | ||
600 | static int | |
601 | svc_udp_sendto(struct svc_rqst *rqstp) | |
602 | { | |
603 | int error; | |
604 | ||
605 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
606 | if (error == -ECONNREFUSED) | |
607 | /* ICMP error on earlier request. */ | |
608 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
609 | ||
610 | return error; | |
611 | } | |
612 | ||
323bee32 TT |
613 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
614 | { | |
615 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
bb5cf160 | 616 | struct svc_serv *serv = xprt->xpt_server; |
323bee32 TT |
617 | unsigned long required; |
618 | ||
619 | /* | |
620 | * Set the SOCK_NOSPACE flag before checking the available | |
621 | * sock space. | |
622 | */ | |
623 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
7a90e8cc | 624 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
323bee32 TT |
625 | if (required*2 > sock_wspace(svsk->sk_sk)) |
626 | return 0; | |
627 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
628 | return 1; | |
629 | } | |
630 | ||
38a417cc TT |
631 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
632 | { | |
633 | BUG(); | |
634 | return NULL; | |
635 | } | |
636 | ||
ea08e392 SM |
637 | static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt) |
638 | { | |
639 | } | |
640 | ||
b700cbb1 | 641 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
62832c03 | 642 | struct net *net, |
b700cbb1 TT |
643 | struct sockaddr *sa, int salen, |
644 | int flags) | |
645 | { | |
62832c03 | 646 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
b700cbb1 TT |
647 | } |
648 | ||
2412e927 | 649 | static const struct svc_xprt_ops svc_udp_ops = { |
b700cbb1 | 650 | .xpo_create = svc_udp_create, |
5d137990 TT |
651 | .xpo_recvfrom = svc_udp_recvfrom, |
652 | .xpo_sendto = svc_udp_sendto, | |
850cbadd | 653 | .xpo_release_rqst = svc_release_udp_skb, |
755cceab TT |
654 | .xpo_detach = svc_sock_detach, |
655 | .xpo_free = svc_sock_free, | |
323bee32 | 656 | .xpo_has_wspace = svc_udp_has_wspace, |
38a417cc | 657 | .xpo_accept = svc_udp_accept, |
16e4d93f | 658 | .xpo_secure_port = svc_sock_secure_port, |
ea08e392 | 659 | .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt, |
360d8738 TT |
660 | }; |
661 | ||
662 | static struct svc_xprt_class svc_udp_class = { | |
663 | .xcl_name = "udp", | |
b700cbb1 | 664 | .xcl_owner = THIS_MODULE, |
360d8738 | 665 | .xcl_ops = &svc_udp_ops, |
49023155 | 666 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
3c45ddf8 | 667 | .xcl_ident = XPRT_TRANSPORT_UDP, |
360d8738 TT |
668 | }; |
669 | ||
bb5cf160 | 670 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 | 671 | { |
7702ce40 | 672 | int err, level, optname, one = 1; |
7a37f578 | 673 | |
bd4620dd SK |
674 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
675 | &svsk->sk_xprt, serv); | |
def13d74 | 676 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
fa9251af | 677 | svsk->sk_sk->sk_data_ready = svc_data_ready; |
1da177e4 | 678 | svsk->sk_sk->sk_write_space = svc_write_space; |
1da177e4 LT |
679 | |
680 | /* initialise setting must have enough space to | |
cca5172a | 681 | * receive and respond to one request. |
1da177e4 LT |
682 | * svc_udp_recvfrom will re-adjust if necessary |
683 | */ | |
684 | svc_sock_setbufsize(svsk->sk_sock, | |
bb5cf160 TT |
685 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
686 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1da177e4 | 687 | |
0f0257ea TT |
688 | /* data might have come in before data_ready set up */ |
689 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
02fc6c36 | 690 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
7a37f578 | 691 | |
7a37f578 | 692 | /* make sure we get destination address info */ |
7702ce40 CL |
693 | switch (svsk->sk_sk->sk_family) { |
694 | case AF_INET: | |
695 | level = SOL_IP; | |
696 | optname = IP_PKTINFO; | |
697 | break; | |
698 | case AF_INET6: | |
699 | level = SOL_IPV6; | |
700 | optname = IPV6_RECVPKTINFO; | |
701 | break; | |
702 | default: | |
703 | BUG(); | |
704 | } | |
705 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
706 | (char *)&one, sizeof(one)); | |
707 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
1da177e4 LT |
708 | } |
709 | ||
710 | /* | |
711 | * A data_ready event on a listening socket means there's a connection | |
712 | * pending. Do not use state_change as a substitute for it. | |
713 | */ | |
676d2369 | 714 | static void svc_tcp_listen_data_ready(struct sock *sk) |
1da177e4 | 715 | { |
939bb7ef | 716 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
717 | |
718 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
939bb7ef | 719 | sk, sk->sk_state); |
1da177e4 | 720 | |
eebe53e8 VL |
721 | if (svsk) { |
722 | /* Refer to svc_setup_socket() for details. */ | |
723 | rmb(); | |
fa9251af | 724 | svsk->sk_odata(sk); |
eebe53e8 VL |
725 | } |
726 | ||
939bb7ef NB |
727 | /* |
728 | * This callback may called twice when a new connection | |
729 | * is established as a child socket inherits everything | |
730 | * from a parent LISTEN socket. | |
731 | * 1) data_ready method of the parent socket will be called | |
732 | * when one of child sockets become ESTABLISHED. | |
733 | * 2) data_ready method of the child socket may be called | |
734 | * when it receives data before the socket is accepted. | |
735 | * In case of 2, we should ignore it silently. | |
736 | */ | |
737 | if (sk->sk_state == TCP_LISTEN) { | |
738 | if (svsk) { | |
02fc6c36 | 739 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
f6150c3c | 740 | svc_xprt_enqueue(&svsk->sk_xprt); |
939bb7ef NB |
741 | } else |
742 | printk("svc: socket %p: no user data\n", sk); | |
1da177e4 | 743 | } |
1da177e4 LT |
744 | } |
745 | ||
746 | /* | |
747 | * A state change on a connected socket means it's dying or dead. | |
748 | */ | |
0f0257ea | 749 | static void svc_tcp_state_change(struct sock *sk) |
1da177e4 | 750 | { |
939bb7ef | 751 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
1da177e4 LT |
752 | |
753 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
939bb7ef | 754 | sk, sk->sk_state, sk->sk_user_data); |
1da177e4 | 755 | |
939bb7ef | 756 | if (!svsk) |
1da177e4 | 757 | printk("svc: socket %p: no user data\n", sk); |
939bb7ef | 758 | else { |
eebe53e8 VL |
759 | /* Refer to svc_setup_socket() for details. */ |
760 | rmb(); | |
fa9251af | 761 | svsk->sk_ostate(sk); |
b2f21f7d TM |
762 | if (sk->sk_state != TCP_ESTABLISHED) { |
763 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
764 | svc_xprt_enqueue(&svsk->sk_xprt); | |
765 | } | |
1da177e4 | 766 | } |
1da177e4 LT |
767 | } |
768 | ||
769 | /* | |
770 | * Accept a TCP connection | |
771 | */ | |
38a417cc | 772 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
1da177e4 | 773 | { |
38a417cc | 774 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
cdd88b9f AM |
775 | struct sockaddr_storage addr; |
776 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
bb5cf160 | 777 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
1da177e4 LT |
778 | struct socket *sock = svsk->sk_sock; |
779 | struct socket *newsock; | |
1da177e4 LT |
780 | struct svc_sock *newsvsk; |
781 | int err, slen; | |
5216a8e7 | 782 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 LT |
783 | |
784 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
785 | if (!sock) | |
38a417cc | 786 | return NULL; |
1da177e4 | 787 | |
02fc6c36 | 788 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
e6242e92 SS |
789 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
790 | if (err < 0) { | |
1da177e4 LT |
791 | if (err == -ENOMEM) |
792 | printk(KERN_WARNING "%s: no more sockets!\n", | |
793 | serv->sv_name); | |
e87cc472 JP |
794 | else if (err != -EAGAIN) |
795 | net_warn_ratelimited("%s: accept failed (err %d)!\n", | |
796 | serv->sv_name, -err); | |
38a417cc | 797 | return NULL; |
1da177e4 | 798 | } |
02fc6c36 | 799 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 800 | |
9b2c45d4 | 801 | err = kernel_getpeername(newsock, sin); |
1da177e4 | 802 | if (err < 0) { |
e87cc472 JP |
803 | net_warn_ratelimited("%s: peername failed (err %d)!\n", |
804 | serv->sv_name, -err); | |
1da177e4 LT |
805 | goto failed; /* aborted connection or whatever */ |
806 | } | |
9b2c45d4 | 807 | slen = err; |
1da177e4 LT |
808 | |
809 | /* Ideally, we would want to reject connections from unauthorized | |
ad06e4bd CL |
810 | * hosts here, but when we get encryption, the IP of the host won't |
811 | * tell us anything. For now just warn about unpriv connections. | |
1da177e4 | 812 | */ |
cdd88b9f | 813 | if (!svc_port_is_privileged(sin)) { |
a48fd0f9 | 814 | dprintk("%s: connect from unprivileged port: %s\n", |
cca5172a | 815 | serv->sv_name, |
cdd88b9f | 816 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 817 | } |
ad06e4bd | 818 | dprintk("%s: connect from %s\n", serv->sv_name, |
cdd88b9f | 819 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 | 820 | |
fa9251af TM |
821 | /* Reset the inherited callbacks before calling svc_setup_socket */ |
822 | newsock->sk->sk_state_change = svsk->sk_ostate; | |
823 | newsock->sk->sk_data_ready = svsk->sk_odata; | |
824 | newsock->sk->sk_write_space = svsk->sk_owspace; | |
825 | ||
1da177e4 LT |
826 | /* make sure that a write doesn't block forever when |
827 | * low on memory | |
828 | */ | |
829 | newsock->sk->sk_sndtimeo = HZ*30; | |
830 | ||
72c35376 BF |
831 | newsvsk = svc_setup_socket(serv, newsock, |
832 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); | |
833 | if (IS_ERR(newsvsk)) | |
1da177e4 | 834 | goto failed; |
9dbc240f | 835 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
9b2c45d4 DV |
836 | err = kernel_getsockname(newsock, sin); |
837 | slen = err; | |
a9747692 FM |
838 | if (unlikely(err < 0)) { |
839 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
840 | slen = offsetof(struct sockaddr, sa_data); | |
841 | } | |
9dbc240f | 842 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
067d7817 | 843 | |
ef11ce24 N |
844 | if (sock_is_loopback(newsock->sk)) |
845 | set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
846 | else | |
847 | clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); | |
f9f3cc4f TT |
848 | if (serv->sv_stats) |
849 | serv->sv_stats->nettcpconn++; | |
850 | ||
851 | return &newsvsk->sk_xprt; | |
852 | ||
853 | failed: | |
854 | sock_release(newsock); | |
855 | return NULL; | |
856 | } | |
857 | ||
31d68ef6 BF |
858 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
859 | { | |
860 | unsigned int i, len, npages; | |
861 | ||
8af345f5 | 862 | if (svsk->sk_datalen == 0) |
31d68ef6 | 863 | return 0; |
8af345f5 | 864 | len = svsk->sk_datalen; |
31d68ef6 BF |
865 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
866 | for (i = 0; i < npages; i++) { | |
867 | if (rqstp->rq_pages[i] != NULL) | |
868 | put_page(rqstp->rq_pages[i]); | |
869 | BUG_ON(svsk->sk_pages[i] == NULL); | |
870 | rqstp->rq_pages[i] = svsk->sk_pages[i]; | |
871 | svsk->sk_pages[i] = NULL; | |
872 | } | |
873 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); | |
874 | return len; | |
875 | } | |
876 | ||
877 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
878 | { | |
879 | unsigned int i, len, npages; | |
880 | ||
8af345f5 | 881 | if (svsk->sk_datalen == 0) |
31d68ef6 | 882 | return; |
8af345f5 | 883 | len = svsk->sk_datalen; |
31d68ef6 BF |
884 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
885 | for (i = 0; i < npages; i++) { | |
886 | svsk->sk_pages[i] = rqstp->rq_pages[i]; | |
887 | rqstp->rq_pages[i] = NULL; | |
888 | } | |
889 | } | |
890 | ||
891 | static void svc_tcp_clear_pages(struct svc_sock *svsk) | |
892 | { | |
893 | unsigned int i, len, npages; | |
894 | ||
8af345f5 | 895 | if (svsk->sk_datalen == 0) |
31d68ef6 | 896 | goto out; |
8af345f5 | 897 | len = svsk->sk_datalen; |
31d68ef6 BF |
898 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
899 | for (i = 0; i < npages; i++) { | |
cf3aa02c BF |
900 | if (svsk->sk_pages[i] == NULL) { |
901 | WARN_ON_ONCE(1); | |
902 | continue; | |
903 | } | |
31d68ef6 BF |
904 | put_page(svsk->sk_pages[i]); |
905 | svsk->sk_pages[i] = NULL; | |
906 | } | |
907 | out: | |
908 | svsk->sk_tcplen = 0; | |
8af345f5 | 909 | svsk->sk_datalen = 0; |
31d68ef6 BF |
910 | } |
911 | ||
1da177e4 | 912 | /* |
ad46ccf0 | 913 | * Receive fragment record header. |
8f55f3c0 | 914 | * If we haven't gotten the record length yet, get the next four bytes. |
1da177e4 | 915 | */ |
8f55f3c0 | 916 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
1da177e4 | 917 | { |
bb5cf160 | 918 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
5ee78d48 | 919 | unsigned int want; |
8f55f3c0 | 920 | int len; |
1da177e4 | 921 | |
c0401ea0 | 922 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
1da177e4 LT |
923 | struct kvec iov; |
924 | ||
5ee78d48 | 925 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
1da177e4 LT |
926 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
927 | iov.iov_len = want; | |
4c8e5537 TM |
928 | len = svc_recvfrom(rqstp, &iov, 1, want, 0); |
929 | if (len < 0) | |
1da177e4 LT |
930 | goto error; |
931 | svsk->sk_tcplen += len; | |
932 | ||
933 | if (len < want) { | |
c0401ea0 CL |
934 | dprintk("svc: short recvfrom while reading record " |
935 | "length (%d of %d)\n", len, want); | |
31d68ef6 | 936 | return -EAGAIN; |
1da177e4 LT |
937 | } |
938 | ||
cc248d4b | 939 | dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk)); |
836fbadb BF |
940 | if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
941 | serv->sv_max_mesg) { | |
3a28e331 BF |
942 | net_notice_ratelimited("RPC: fragment too large: %d\n", |
943 | svc_sock_reclen(svsk)); | |
1da177e4 LT |
944 | goto err_delete; |
945 | } | |
946 | } | |
947 | ||
cc248d4b | 948 | return svc_sock_reclen(svsk); |
31d68ef6 BF |
949 | error: |
950 | dprintk("RPC: TCP recv_record got %d\n", len); | |
8f55f3c0 | 951 | return len; |
31d68ef6 | 952 | err_delete: |
8f55f3c0 | 953 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
8f55f3c0 AB |
954 | return -EAGAIN; |
955 | } | |
956 | ||
586c52cc | 957 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
4cfc7e60 | 958 | { |
586c52cc | 959 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
4cfc7e60 | 960 | struct rpc_rqst *req = NULL; |
586c52cc TM |
961 | struct kvec *src, *dst; |
962 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
48e6555c BF |
963 | __be32 xid; |
964 | __be32 calldir; | |
4cfc7e60 | 965 | |
4cfc7e60 RI |
966 | xid = *p++; |
967 | calldir = *p; | |
968 | ||
093a1468 | 969 | if (!bc_xprt) |
586c52cc | 970 | return -EAGAIN; |
75c84151 | 971 | spin_lock(&bc_xprt->queue_lock); |
093a1468 TM |
972 | req = xprt_lookup_rqst(bc_xprt, xid); |
973 | if (!req) | |
974 | goto unlock_notfound; | |
586c52cc TM |
975 | |
976 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
977 | /* | |
978 | * XXX!: cheating for now! Only copying HEAD. | |
979 | * But we know this is good enough for now (in fact, for any | |
980 | * callback reply in the forseeable future). | |
981 | */ | |
982 | dst = &req->rq_private_buf.head[0]; | |
983 | src = &rqstp->rq_arg.head[0]; | |
984 | if (dst->iov_len < src->iov_len) | |
093a1468 | 985 | goto unlock_eagain; /* whatever; just giving up. */ |
586c52cc | 986 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
cc248d4b | 987 | xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
586c52cc | 988 | rqstp->rq_arg.len = 0; |
75c84151 | 989 | spin_unlock(&bc_xprt->queue_lock); |
586c52cc | 990 | return 0; |
093a1468 TM |
991 | unlock_notfound: |
992 | printk(KERN_NOTICE | |
993 | "%s: Got unrecognized reply: " | |
994 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
995 | __func__, ntohl(calldir), | |
996 | bc_xprt, ntohl(xid)); | |
997 | unlock_eagain: | |
75c84151 | 998 | spin_unlock(&bc_xprt->queue_lock); |
093a1468 | 999 | return -EAGAIN; |
586c52cc TM |
1000 | } |
1001 | ||
1002 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1003 | { | |
1004 | int i = 0; | |
1005 | int t = 0; | |
1006 | ||
1007 | while (t < len) { | |
1008 | vec[i].iov_base = page_address(pages[i]); | |
1009 | vec[i].iov_len = PAGE_SIZE; | |
1010 | i++; | |
1011 | t += PAGE_SIZE; | |
1012 | } | |
1013 | return i; | |
4cfc7e60 RI |
1014 | } |
1015 | ||
836fbadb BF |
1016 | static void svc_tcp_fragment_received(struct svc_sock *svsk) |
1017 | { | |
1018 | /* If we have more data, signal svc_xprt_enqueue() to try again */ | |
836fbadb BF |
1019 | dprintk("svc: TCP %s record (%d bytes)\n", |
1020 | svc_sock_final_rec(svsk) ? "final" : "nonfinal", | |
1021 | svc_sock_reclen(svsk)); | |
1022 | svsk->sk_tcplen = 0; | |
1023 | svsk->sk_reclen = 0; | |
1024 | } | |
31d68ef6 | 1025 | |
8f55f3c0 AB |
1026 | /* |
1027 | * Receive data from a TCP socket. | |
1028 | */ | |
1029 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1030 | { | |
1031 | struct svc_sock *svsk = | |
1032 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1033 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1034 | int len; | |
1035 | struct kvec *vec; | |
31d68ef6 | 1036 | unsigned int want, base; |
586c52cc TM |
1037 | __be32 *p; |
1038 | __be32 calldir; | |
5ee78d48 | 1039 | int pnum; |
8f55f3c0 AB |
1040 | |
1041 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1042 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1043 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1044 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1045 | ||
1046 | len = svc_tcp_recv_record(svsk, rqstp); | |
1047 | if (len < 0) | |
1048 | goto error; | |
1049 | ||
31d68ef6 | 1050 | base = svc_tcp_restore_pages(svsk, rqstp); |
836fbadb | 1051 | want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
31d68ef6 | 1052 | |
3cc03b16 | 1053 | vec = rqstp->rq_vec; |
4cfc7e60 | 1054 | |
4c8e5537 | 1055 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], base + want); |
586c52cc | 1056 | |
44524359 | 1057 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
afc59400 | 1058 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
1da177e4 LT |
1059 | |
1060 | /* Now receive data */ | |
4c8e5537 | 1061 | len = svc_recvfrom(rqstp, vec, pnum, base + want, base); |
8af345f5 | 1062 | if (len >= 0) { |
31d68ef6 | 1063 | svsk->sk_tcplen += len; |
8af345f5 BF |
1064 | svsk->sk_datalen += len; |
1065 | } | |
836fbadb | 1066 | if (len != want || !svc_sock_final_rec(svsk)) { |
be1e4444 | 1067 | svc_tcp_save_pages(svsk, rqstp); |
31d68ef6 | 1068 | if (len < 0 && len != -EAGAIN) |
ad46ccf0 | 1069 | goto err_delete; |
836fbadb BF |
1070 | if (len == want) |
1071 | svc_tcp_fragment_received(svsk); | |
1072 | else | |
3a28e331 BF |
1073 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
1074 | (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)), | |
836fbadb | 1075 | svc_sock_reclen(svsk)); |
31d68ef6 BF |
1076 | goto err_noclose; |
1077 | } | |
1da177e4 | 1078 | |
1f691b07 | 1079 | if (svsk->sk_datalen < 8) { |
cf3aa02c | 1080 | svsk->sk_datalen = 0; |
ad46ccf0 | 1081 | goto err_delete; /* client is nuts. */ |
cf3aa02c | 1082 | } |
ad46ccf0 | 1083 | |
836fbadb | 1084 | rqstp->rq_arg.len = svsk->sk_datalen; |
1da177e4 | 1085 | rqstp->rq_arg.page_base = 0; |
5ee78d48 TM |
1086 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
1087 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1da177e4 | 1088 | rqstp->rq_arg.page_len = 0; |
5ee78d48 TM |
1089 | } else |
1090 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1da177e4 | 1091 | |
5148bf4e | 1092 | rqstp->rq_xprt_ctxt = NULL; |
1da177e4 | 1093 | rqstp->rq_prot = IPPROTO_TCP; |
7501cc2b JL |
1094 | if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
1095 | set_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1096 | else | |
1097 | clear_bit(RQ_LOCAL, &rqstp->rq_flags); | |
1da177e4 | 1098 | |
586c52cc TM |
1099 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
1100 | calldir = p[1]; | |
8985ef0b | 1101 | if (calldir) |
586c52cc | 1102 | len = receive_cb_reply(svsk, rqstp); |
586c52cc | 1103 | |
1da177e4 | 1104 | /* Reset TCP read info */ |
8af345f5 | 1105 | svsk->sk_datalen = 0; |
836fbadb | 1106 | svc_tcp_fragment_received(svsk); |
0601f793 | 1107 | |
8985ef0b BF |
1108 | if (len < 0) |
1109 | goto error; | |
1da177e4 | 1110 | |
9dbc240f | 1111 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
1da177e4 LT |
1112 | if (serv->sv_stats) |
1113 | serv->sv_stats->nettcpcnt++; | |
1114 | ||
5ee78d48 | 1115 | return rqstp->rq_arg.len; |
1da177e4 | 1116 | |
8f55f3c0 | 1117 | error: |
31d68ef6 | 1118 | if (len != -EAGAIN) |
ad46ccf0 | 1119 | goto err_delete; |
31d68ef6 | 1120 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
9f9d2ebe | 1121 | return 0; |
ad46ccf0 | 1122 | err_delete: |
31d68ef6 BF |
1123 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
1124 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1125 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1126 | err_noclose: | |
9f9d2ebe | 1127 | return 0; /* record not complete */ |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | /* | |
1131 | * Send out data on TCP socket. | |
1132 | */ | |
0f0257ea | 1133 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
1da177e4 LT |
1134 | { |
1135 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1136 | int sent; | |
d8ed029d | 1137 | __be32 reclen; |
1da177e4 LT |
1138 | |
1139 | /* Set up the first element of the reply kvec. | |
1140 | * Any other kvecs that may be in use have been taken | |
1141 | * care of by the server implementation itself. | |
1142 | */ | |
1143 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1144 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1145 | ||
1da177e4 LT |
1146 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
1147 | if (sent != xbufp->len) { | |
0f0257ea TT |
1148 | printk(KERN_NOTICE |
1149 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1150 | "- shutting down socket\n", | |
57b1d3ba | 1151 | rqstp->rq_xprt->xpt_server->sv_name, |
1da177e4 LT |
1152 | (sent<0)?"got error":"sent only", |
1153 | sent, xbufp->len); | |
57b1d3ba | 1154 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
f6150c3c | 1155 | svc_xprt_enqueue(rqstp->rq_xprt); |
1da177e4 LT |
1156 | sent = -EAGAIN; |
1157 | } | |
1158 | return sent; | |
1159 | } | |
1160 | ||
b700cbb1 | 1161 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
62832c03 | 1162 | struct net *net, |
b700cbb1 TT |
1163 | struct sockaddr *sa, int salen, |
1164 | int flags) | |
1165 | { | |
62832c03 | 1166 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
b700cbb1 TT |
1167 | } |
1168 | ||
2412e927 | 1169 | static const struct svc_xprt_ops svc_tcp_ops = { |
b700cbb1 | 1170 | .xpo_create = svc_tcp_create, |
5d137990 TT |
1171 | .xpo_recvfrom = svc_tcp_recvfrom, |
1172 | .xpo_sendto = svc_tcp_sendto, | |
5148bf4e | 1173 | .xpo_release_rqst = svc_release_skb, |
69b6ba37 | 1174 | .xpo_detach = svc_tcp_sock_detach, |
755cceab | 1175 | .xpo_free = svc_sock_free, |
323bee32 | 1176 | .xpo_has_wspace = svc_tcp_has_wspace, |
38a417cc | 1177 | .xpo_accept = svc_tcp_accept, |
16e4d93f | 1178 | .xpo_secure_port = svc_sock_secure_port, |
ea08e392 | 1179 | .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt, |
360d8738 TT |
1180 | }; |
1181 | ||
1182 | static struct svc_xprt_class svc_tcp_class = { | |
1183 | .xcl_name = "tcp", | |
b700cbb1 | 1184 | .xcl_owner = THIS_MODULE, |
360d8738 | 1185 | .xcl_ops = &svc_tcp_ops, |
49023155 | 1186 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
3c45ddf8 | 1187 | .xcl_ident = XPRT_TRANSPORT_TCP, |
360d8738 TT |
1188 | }; |
1189 | ||
1190 | void svc_init_xprt_sock(void) | |
1191 | { | |
1192 | svc_reg_xprt_class(&svc_tcp_class); | |
1193 | svc_reg_xprt_class(&svc_udp_class); | |
1194 | } | |
1195 | ||
1196 | void svc_cleanup_xprt_sock(void) | |
1197 | { | |
1198 | svc_unreg_xprt_class(&svc_tcp_class); | |
1199 | svc_unreg_xprt_class(&svc_udp_class); | |
1200 | } | |
1201 | ||
bb5cf160 | 1202 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
1da177e4 LT |
1203 | { |
1204 | struct sock *sk = svsk->sk_sk; | |
1da177e4 | 1205 | |
bd4620dd SK |
1206 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
1207 | &svsk->sk_xprt, serv); | |
def13d74 | 1208 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
362142b2 | 1209 | set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1210 | if (sk->sk_state == TCP_LISTEN) { |
1211 | dprintk("setting up TCP socket for listening\n"); | |
ece200dd | 1212 | strcpy(svsk->sk_xprt.xpt_remotebuf, "listener"); |
02fc6c36 | 1213 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
1da177e4 | 1214 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
02fc6c36 | 1215 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1216 | } else { |
1217 | dprintk("setting up TCP socket for reading\n"); | |
1218 | sk->sk_state_change = svc_tcp_state_change; | |
fa9251af | 1219 | sk->sk_data_ready = svc_data_ready; |
637600f3 | 1220 | sk->sk_write_space = svc_write_space; |
1da177e4 LT |
1221 | |
1222 | svsk->sk_reclen = 0; | |
1223 | svsk->sk_tcplen = 0; | |
8af345f5 | 1224 | svsk->sk_datalen = 0; |
31d68ef6 | 1225 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
1da177e4 | 1226 | |
b7872fe8 | 1227 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
1da177e4 | 1228 | |
02fc6c36 | 1229 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
b2f21f7d TM |
1230 | switch (sk->sk_state) { |
1231 | case TCP_SYN_RECV: | |
1232 | case TCP_ESTABLISHED: | |
1233 | break; | |
1234 | default: | |
02fc6c36 | 1235 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
b2f21f7d | 1236 | } |
1da177e4 LT |
1237 | } |
1238 | } | |
1239 | ||
0f0257ea | 1240 | void svc_sock_update_bufs(struct svc_serv *serv) |
1da177e4 LT |
1241 | { |
1242 | /* | |
1243 | * The number of server threads has changed. Update | |
1244 | * rcvbuf and sndbuf accordingly on all sockets | |
1245 | */ | |
8f3a6de3 | 1246 | struct svc_sock *svsk; |
1da177e4 LT |
1247 | |
1248 | spin_lock_bh(&serv->sv_lock); | |
8f3a6de3 | 1249 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
02fc6c36 | 1250 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
1da177e4 LT |
1251 | spin_unlock_bh(&serv->sv_lock); |
1252 | } | |
24c3767e | 1253 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
1da177e4 | 1254 | |
1da177e4 LT |
1255 | /* |
1256 | * Initialize socket for RPC use and create svc_sock struct | |
1da177e4 | 1257 | */ |
6b174337 CL |
1258 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
1259 | struct socket *sock, | |
72c35376 | 1260 | int flags) |
1da177e4 LT |
1261 | { |
1262 | struct svc_sock *svsk; | |
1263 | struct sock *inet; | |
6b174337 | 1264 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
72c35376 | 1265 | int err = 0; |
1da177e4 LT |
1266 | |
1267 | dprintk("svc: svc_setup_socket %p\n", sock); | |
72c35376 BF |
1268 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
1269 | if (!svsk) | |
1270 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
1271 | |
1272 | inet = sock->sk; | |
1273 | ||
1274 | /* Register socket with portmapper */ | |
72c35376 BF |
1275 | if (pmap_register) |
1276 | err = svc_register(serv, sock_net(sock->sk), inet->sk_family, | |
5247fab5 | 1277 | inet->sk_protocol, |
c720c7e8 | 1278 | ntohs(inet_sk(inet)->inet_sport)); |
1da177e4 | 1279 | |
72c35376 | 1280 | if (err < 0) { |
1da177e4 | 1281 | kfree(svsk); |
72c35376 | 1282 | return ERR_PTR(err); |
1da177e4 LT |
1283 | } |
1284 | ||
1da177e4 LT |
1285 | svsk->sk_sock = sock; |
1286 | svsk->sk_sk = inet; | |
1287 | svsk->sk_ostate = inet->sk_state_change; | |
1288 | svsk->sk_odata = inet->sk_data_ready; | |
1289 | svsk->sk_owspace = inet->sk_write_space; | |
eebe53e8 VL |
1290 | /* |
1291 | * This barrier is necessary in order to prevent race condition | |
1292 | * with svc_data_ready(), svc_listen_data_ready() and others | |
1293 | * when calling callbacks above. | |
1294 | */ | |
1295 | wmb(); | |
1296 | inet->sk_user_data = svsk; | |
1da177e4 LT |
1297 | |
1298 | /* Initialize the socket */ | |
1299 | if (sock->type == SOCK_DGRAM) | |
bb5cf160 | 1300 | svc_udp_init(svsk, serv); |
637600f3 | 1301 | else |
bb5cf160 | 1302 | svc_tcp_init(svsk, serv); |
1da177e4 | 1303 | |
c7995f8a TM |
1304 | dprintk("svc: svc_setup_socket created %p (inet %p), " |
1305 | "listen %d close %d\n", | |
1306 | svsk, svsk->sk_sk, | |
1307 | test_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags), | |
1308 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1da177e4 | 1309 | |
1da177e4 LT |
1310 | return svsk; |
1311 | } | |
1312 | ||
30646394 SK |
1313 | bool svc_alien_sock(struct net *net, int fd) |
1314 | { | |
1315 | int err; | |
1316 | struct socket *sock = sockfd_lookup(fd, &err); | |
1317 | bool ret = false; | |
1318 | ||
1319 | if (!sock) | |
1320 | goto out; | |
1321 | if (sock_net(sock->sk) != net) | |
1322 | ret = true; | |
1323 | sockfd_put(sock); | |
1324 | out: | |
1325 | return ret; | |
1326 | } | |
1327 | EXPORT_SYMBOL_GPL(svc_alien_sock); | |
1328 | ||
bfba9ab4 CL |
1329 | /** |
1330 | * svc_addsock - add a listener socket to an RPC service | |
1331 | * @serv: pointer to RPC service to which to add a new listener | |
1332 | * @fd: file descriptor of the new listener | |
1333 | * @name_return: pointer to buffer to fill in with name of listener | |
1334 | * @len: size of the buffer | |
1335 | * | |
1336 | * Fills in socket name and returns positive length of name if successful. | |
1337 | * Name is terminated with '\n'. On error, returns a negative errno | |
1338 | * value. | |
1339 | */ | |
1340 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1341 | const size_t len) | |
b41b66d6 N |
1342 | { |
1343 | int err = 0; | |
1344 | struct socket *so = sockfd_lookup(fd, &err); | |
1345 | struct svc_sock *svsk = NULL; | |
a8e10078 BF |
1346 | struct sockaddr_storage addr; |
1347 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1348 | int salen; | |
b41b66d6 N |
1349 | |
1350 | if (!so) | |
1351 | return err; | |
a8e10078 | 1352 | err = -EAFNOSUPPORT; |
205ba423 | 1353 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
a8e10078 BF |
1354 | goto out; |
1355 | err = -EPROTONOSUPPORT; | |
1356 | if (so->sk->sk_protocol != IPPROTO_TCP && | |
b41b66d6 | 1357 | so->sk->sk_protocol != IPPROTO_UDP) |
a8e10078 BF |
1358 | goto out; |
1359 | err = -EISCONN; | |
1360 | if (so->state > SS_UNCONNECTED) | |
1361 | goto out; | |
1362 | err = -ENOENT; | |
1363 | if (!try_module_get(THIS_MODULE)) | |
1364 | goto out; | |
1365 | svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); | |
1366 | if (IS_ERR(svsk)) { | |
1367 | module_put(THIS_MODULE); | |
1368 | err = PTR_ERR(svsk); | |
1369 | goto out; | |
b41b66d6 | 1370 | } |
9b2c45d4 DV |
1371 | salen = kernel_getsockname(svsk->sk_sock, sin); |
1372 | if (salen >= 0) | |
a8e10078 | 1373 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); |
39b55301 | 1374 | svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
e7942b9f | 1375 | return svc_one_sock_name(svsk, name_return, len); |
a8e10078 BF |
1376 | out: |
1377 | sockfd_put(so); | |
1378 | return err; | |
b41b66d6 N |
1379 | } |
1380 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1381 | ||
1da177e4 LT |
1382 | /* |
1383 | * Create socket for RPC service. | |
1384 | */ | |
b700cbb1 TT |
1385 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
1386 | int protocol, | |
62832c03 | 1387 | struct net *net, |
b700cbb1 TT |
1388 | struct sockaddr *sin, int len, |
1389 | int flags) | |
1da177e4 LT |
1390 | { |
1391 | struct svc_sock *svsk; | |
1392 | struct socket *sock; | |
1393 | int error; | |
1394 | int type; | |
9dbc240f TT |
1395 | struct sockaddr_storage addr; |
1396 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1397 | int newlen; | |
c69da774 TM |
1398 | int family; |
1399 | int val; | |
5216a8e7 | 1400 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 1401 | |
ad06e4bd CL |
1402 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
1403 | serv->sv_program->pg_name, protocol, | |
77f1f67a | 1404 | __svc_print_addr(sin, buf, sizeof(buf))); |
1da177e4 LT |
1405 | |
1406 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1407 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1408 | "sockets supported\n"); | |
b700cbb1 | 1409 | return ERR_PTR(-EINVAL); |
1da177e4 | 1410 | } |
c69da774 | 1411 | |
1da177e4 | 1412 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
c69da774 TM |
1413 | switch (sin->sa_family) { |
1414 | case AF_INET6: | |
1415 | family = PF_INET6; | |
1416 | break; | |
1417 | case AF_INET: | |
1418 | family = PF_INET; | |
1419 | break; | |
1420 | default: | |
1421 | return ERR_PTR(-EINVAL); | |
1422 | } | |
1da177e4 | 1423 | |
14ec63c3 | 1424 | error = __sock_create(net, family, type, protocol, &sock, 1); |
77f1f67a | 1425 | if (error < 0) |
b700cbb1 | 1426 | return ERR_PTR(error); |
1da177e4 | 1427 | |
ed07536e PZ |
1428 | svc_reclassify_socket(sock); |
1429 | ||
c69da774 TM |
1430 | /* |
1431 | * If this is an PF_INET6 listener, we want to avoid | |
1432 | * getting requests from IPv4 remotes. Those should | |
1433 | * be shunted to a PF_INET listener via rpcbind. | |
1434 | */ | |
1435 | val = 1; | |
1436 | if (family == PF_INET6) | |
1437 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1438 | (char *)&val, sizeof(val)); | |
1439 | ||
18114746 | 1440 | if (type == SOCK_STREAM) |
4a17fd52 | 1441 | sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
77f1f67a | 1442 | error = kernel_bind(sock, sin, len); |
18114746 ES |
1443 | if (error < 0) |
1444 | goto bummer; | |
1da177e4 | 1445 | |
9b2c45d4 | 1446 | error = kernel_getsockname(sock, newsin); |
9dbc240f TT |
1447 | if (error < 0) |
1448 | goto bummer; | |
9b2c45d4 | 1449 | newlen = error; |
9dbc240f | 1450 | |
1da177e4 | 1451 | if (protocol == IPPROTO_TCP) { |
e6242e92 | 1452 | if ((error = kernel_listen(sock, 64)) < 0) |
1da177e4 LT |
1453 | goto bummer; |
1454 | } | |
1455 | ||
72c35376 | 1456 | svsk = svc_setup_socket(serv, sock, flags); |
a8e10078 BF |
1457 | if (IS_ERR(svsk)) { |
1458 | error = PTR_ERR(svsk); | |
1459 | goto bummer; | |
e79eff1f | 1460 | } |
a8e10078 BF |
1461 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
1462 | return (struct svc_xprt *)svsk; | |
1da177e4 LT |
1463 | bummer: |
1464 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1465 | sock_release(sock); | |
b700cbb1 | 1466 | return ERR_PTR(error); |
1da177e4 LT |
1467 | } |
1468 | ||
755cceab TT |
1469 | /* |
1470 | * Detach the svc_sock from the socket so that no | |
1471 | * more callbacks occur. | |
1472 | */ | |
1473 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1474 | { | |
1475 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1476 | struct sock *sk = svsk->sk_sk; | |
1477 | ||
1478 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1479 | ||
1480 | /* put back the old socket callbacks */ | |
069c225b | 1481 | lock_sock(sk); |
755cceab TT |
1482 | sk->sk_state_change = svsk->sk_ostate; |
1483 | sk->sk_data_ready = svsk->sk_odata; | |
1484 | sk->sk_write_space = svsk->sk_owspace; | |
069c225b TM |
1485 | sk->sk_user_data = NULL; |
1486 | release_sock(sk); | |
69b6ba37 TM |
1487 | } |
1488 | ||
1489 | /* | |
1490 | * Disconnect the socket, and reset the callbacks | |
1491 | */ | |
1492 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1493 | { | |
1494 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1495 | ||
1496 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1497 | ||
1498 | svc_sock_detach(xprt); | |
1499 | ||
31d68ef6 BF |
1500 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
1501 | svc_tcp_clear_pages(svsk); | |
69b6ba37 | 1502 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
31d68ef6 | 1503 | } |
755cceab TT |
1504 | } |
1505 | ||
1506 | /* | |
1507 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1508 | */ | |
1509 | static void svc_sock_free(struct svc_xprt *xprt) | |
1510 | { | |
1511 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1512 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1513 | ||
755cceab TT |
1514 | if (svsk->sk_sock->file) |
1515 | sockfd_put(svsk->sk_sock); | |
1516 | else | |
1517 | sock_release(svsk->sk_sock); | |
1518 | kfree(svsk); | |
1519 | } |