]>
Commit | Line | Data |
---|---|---|
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 | |
8 | * svc_xprt_enqueue procedure... | |
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 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/inet.h> | |
29 | #include <linux/udp.h> | |
30 | #include <linux/tcp.h> | |
31 | #include <linux/unistd.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/skbuff.h> | |
35 | #include <linux/file.h> | |
36 | #include <linux/freezer.h> | |
37 | #include <net/sock.h> | |
38 | #include <net/checksum.h> | |
39 | #include <net/ip.h> | |
40 | #include <net/ipv6.h> | |
41 | #include <net/tcp.h> | |
42 | #include <net/tcp_states.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/ioctls.h> | |
45 | ||
46 | #include <linux/sunrpc/types.h> | |
47 | #include <linux/sunrpc/clnt.h> | |
48 | #include <linux/sunrpc/xdr.h> | |
49 | #include <linux/sunrpc/msg_prot.h> | |
50 | #include <linux/sunrpc/svcsock.h> | |
51 | #include <linux/sunrpc/stats.h> | |
52 | #include <linux/sunrpc/xprt.h> | |
53 | ||
54 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT | |
55 | ||
56 | ||
57 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, | |
58 | int *errp, int flags); | |
59 | static void svc_udp_data_ready(struct sock *, int); | |
60 | static int svc_udp_recvfrom(struct svc_rqst *); | |
61 | static int svc_udp_sendto(struct svc_rqst *); | |
62 | static void svc_sock_detach(struct svc_xprt *); | |
63 | static void svc_tcp_sock_detach(struct svc_xprt *); | |
64 | static void svc_sock_free(struct svc_xprt *); | |
65 | ||
66 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, | |
67 | struct net *, struct sockaddr *, | |
68 | int, int); | |
69 | #if defined(CONFIG_NFS_V4_1) | |
70 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, | |
71 | struct net *, struct sockaddr *, | |
72 | int, int); | |
73 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
74 | #endif /* CONFIG_NFS_V4_1 */ | |
75 | ||
76 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
77 | static struct lock_class_key svc_key[2]; | |
78 | static struct lock_class_key svc_slock_key[2]; | |
79 | ||
80 | static void svc_reclassify_socket(struct socket *sock) | |
81 | { | |
82 | struct sock *sk = sock->sk; | |
83 | BUG_ON(sock_owned_by_user(sk)); | |
84 | switch (sk->sk_family) { | |
85 | case AF_INET: | |
86 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", | |
87 | &svc_slock_key[0], | |
88 | "sk_xprt.xpt_lock-AF_INET-NFSD", | |
89 | &svc_key[0]); | |
90 | break; | |
91 | ||
92 | case AF_INET6: | |
93 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", | |
94 | &svc_slock_key[1], | |
95 | "sk_xprt.xpt_lock-AF_INET6-NFSD", | |
96 | &svc_key[1]); | |
97 | break; | |
98 | ||
99 | default: | |
100 | BUG(); | |
101 | } | |
102 | } | |
103 | #else | |
104 | static void svc_reclassify_socket(struct socket *sock) | |
105 | { | |
106 | } | |
107 | #endif | |
108 | ||
109 | /* | |
110 | * Release an skbuff after use | |
111 | */ | |
112 | static void svc_release_skb(struct svc_rqst *rqstp) | |
113 | { | |
114 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; | |
115 | ||
116 | if (skb) { | |
117 | struct svc_sock *svsk = | |
118 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
119 | rqstp->rq_xprt_ctxt = NULL; | |
120 | ||
121 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); | |
122 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
123 | } | |
124 | } | |
125 | ||
126 | union svc_pktinfo_u { | |
127 | struct in_pktinfo pkti; | |
128 | struct in6_pktinfo pkti6; | |
129 | }; | |
130 | #define SVC_PKTINFO_SPACE \ | |
131 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) | |
132 | ||
133 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) | |
134 | { | |
135 | struct svc_sock *svsk = | |
136 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
137 | switch (svsk->sk_sk->sk_family) { | |
138 | case AF_INET: { | |
139 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
140 | ||
141 | cmh->cmsg_level = SOL_IP; | |
142 | cmh->cmsg_type = IP_PKTINFO; | |
143 | pki->ipi_ifindex = 0; | |
144 | pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr; | |
145 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
146 | } | |
147 | break; | |
148 | ||
149 | case AF_INET6: { | |
150 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
151 | ||
152 | cmh->cmsg_level = SOL_IPV6; | |
153 | cmh->cmsg_type = IPV6_PKTINFO; | |
154 | pki->ipi6_ifindex = 0; | |
155 | ipv6_addr_copy(&pki->ipi6_addr, | |
156 | &rqstp->rq_daddr.addr6); | |
157 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); | |
158 | } | |
159 | break; | |
160 | } | |
161 | } | |
162 | ||
163 | /* | |
164 | * send routine intended to be shared by the fore- and back-channel | |
165 | */ | |
166 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, | |
167 | struct page *headpage, unsigned long headoffset, | |
168 | struct page *tailpage, unsigned long tailoffset) | |
169 | { | |
170 | int result; | |
171 | int size; | |
172 | struct page **ppage = xdr->pages; | |
173 | size_t base = xdr->page_base; | |
174 | unsigned int pglen = xdr->page_len; | |
175 | unsigned int flags = MSG_MORE; | |
176 | int slen; | |
177 | int len = 0; | |
178 | ||
179 | slen = xdr->len; | |
180 | ||
181 | /* send head */ | |
182 | if (slen == xdr->head[0].iov_len) | |
183 | flags = 0; | |
184 | len = kernel_sendpage(sock, headpage, headoffset, | |
185 | xdr->head[0].iov_len, flags); | |
186 | if (len != xdr->head[0].iov_len) | |
187 | goto out; | |
188 | slen -= xdr->head[0].iov_len; | |
189 | if (slen == 0) | |
190 | goto out; | |
191 | ||
192 | /* send page data */ | |
193 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; | |
194 | while (pglen > 0) { | |
195 | if (slen == size) | |
196 | flags = 0; | |
197 | result = kernel_sendpage(sock, *ppage, base, size, flags); | |
198 | if (result > 0) | |
199 | len += result; | |
200 | if (result != size) | |
201 | goto out; | |
202 | slen -= size; | |
203 | pglen -= size; | |
204 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; | |
205 | base = 0; | |
206 | ppage++; | |
207 | } | |
208 | ||
209 | /* send tail */ | |
210 | if (xdr->tail[0].iov_len) { | |
211 | result = kernel_sendpage(sock, tailpage, tailoffset, | |
212 | xdr->tail[0].iov_len, 0); | |
213 | if (result > 0) | |
214 | len += result; | |
215 | } | |
216 | ||
217 | out: | |
218 | return len; | |
219 | } | |
220 | ||
221 | ||
222 | /* | |
223 | * Generic sendto routine | |
224 | */ | |
225 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) | |
226 | { | |
227 | struct svc_sock *svsk = | |
228 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
229 | struct socket *sock = svsk->sk_sock; | |
230 | union { | |
231 | struct cmsghdr hdr; | |
232 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
233 | } buffer; | |
234 | struct cmsghdr *cmh = &buffer.hdr; | |
235 | int len = 0; | |
236 | unsigned long tailoff; | |
237 | unsigned long headoff; | |
238 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
239 | ||
240 | if (rqstp->rq_prot == IPPROTO_UDP) { | |
241 | struct msghdr msg = { | |
242 | .msg_name = &rqstp->rq_addr, | |
243 | .msg_namelen = rqstp->rq_addrlen, | |
244 | .msg_control = cmh, | |
245 | .msg_controllen = sizeof(buffer), | |
246 | .msg_flags = MSG_MORE, | |
247 | }; | |
248 | ||
249 | svc_set_cmsg_data(rqstp, cmh); | |
250 | ||
251 | if (sock_sendmsg(sock, &msg, 0) < 0) | |
252 | goto out; | |
253 | } | |
254 | ||
255 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); | |
256 | headoff = 0; | |
257 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, | |
258 | rqstp->rq_respages[0], tailoff); | |
259 | ||
260 | out: | |
261 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", | |
262 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, | |
263 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); | |
264 | ||
265 | return len; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Report socket names for nfsdfs | |
270 | */ | |
271 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) | |
272 | { | |
273 | const struct sock *sk = svsk->sk_sk; | |
274 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? | |
275 | "udp" : "tcp"; | |
276 | int len; | |
277 | ||
278 | switch (sk->sk_family) { | |
279 | case PF_INET: | |
280 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", | |
281 | proto_name, | |
282 | &inet_sk(sk)->inet_rcv_saddr, | |
283 | inet_sk(sk)->inet_num); | |
284 | break; | |
285 | case PF_INET6: | |
286 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", | |
287 | proto_name, | |
288 | &inet6_sk(sk)->rcv_saddr, | |
289 | inet_sk(sk)->inet_num); | |
290 | break; | |
291 | default: | |
292 | len = snprintf(buf, remaining, "*unknown-%d*\n", | |
293 | sk->sk_family); | |
294 | } | |
295 | ||
296 | if (len >= remaining) { | |
297 | *buf = '\0'; | |
298 | return -ENAMETOOLONG; | |
299 | } | |
300 | return len; | |
301 | } | |
302 | ||
303 | /** | |
304 | * svc_sock_names - construct a list of listener names in a string | |
305 | * @serv: pointer to RPC service | |
306 | * @buf: pointer to a buffer to fill in with socket names | |
307 | * @buflen: size of the buffer to be filled | |
308 | * @toclose: pointer to '\0'-terminated C string containing the name | |
309 | * of a listener to be closed | |
310 | * | |
311 | * Fills in @buf with a '\n'-separated list of names of listener | |
312 | * sockets. If @toclose is not NULL, the socket named by @toclose | |
313 | * is closed, and is not included in the output list. | |
314 | * | |
315 | * Returns positive length of the socket name string, or a negative | |
316 | * errno value on error. | |
317 | */ | |
318 | int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen, | |
319 | const char *toclose) | |
320 | { | |
321 | struct svc_sock *svsk, *closesk = NULL; | |
322 | int len = 0; | |
323 | ||
324 | if (!serv) | |
325 | return 0; | |
326 | ||
327 | spin_lock_bh(&serv->sv_lock); | |
328 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { | |
329 | int onelen = svc_one_sock_name(svsk, buf + len, buflen - len); | |
330 | if (onelen < 0) { | |
331 | len = onelen; | |
332 | break; | |
333 | } | |
334 | if (toclose && strcmp(toclose, buf + len) == 0) { | |
335 | closesk = svsk; | |
336 | svc_xprt_get(&closesk->sk_xprt); | |
337 | } else | |
338 | len += onelen; | |
339 | } | |
340 | spin_unlock_bh(&serv->sv_lock); | |
341 | ||
342 | if (closesk) { | |
343 | /* Should unregister with portmap, but you cannot | |
344 | * unregister just one protocol... | |
345 | */ | |
346 | svc_close_xprt(&closesk->sk_xprt); | |
347 | svc_xprt_put(&closesk->sk_xprt); | |
348 | } else if (toclose) | |
349 | return -ENOENT; | |
350 | return len; | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(svc_sock_names); | |
353 | ||
354 | /* | |
355 | * Check input queue length | |
356 | */ | |
357 | static int svc_recv_available(struct svc_sock *svsk) | |
358 | { | |
359 | struct socket *sock = svsk->sk_sock; | |
360 | int avail, err; | |
361 | ||
362 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); | |
363 | ||
364 | return (err >= 0)? avail : err; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Generic recvfrom routine. | |
369 | */ | |
370 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, | |
371 | int buflen) | |
372 | { | |
373 | struct svc_sock *svsk = | |
374 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
375 | struct msghdr msg = { | |
376 | .msg_flags = MSG_DONTWAIT, | |
377 | }; | |
378 | int len; | |
379 | ||
380 | rqstp->rq_xprt_hlen = 0; | |
381 | ||
382 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, | |
383 | msg.msg_flags); | |
384 | ||
385 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", | |
386 | svsk, iov[0].iov_base, iov[0].iov_len, len); | |
387 | return len; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Set socket snd and rcv buffer lengths | |
392 | */ | |
393 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, | |
394 | unsigned int rcv) | |
395 | { | |
396 | #if 0 | |
397 | mm_segment_t oldfs; | |
398 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
399 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, | |
400 | (char*)&snd, sizeof(snd)); | |
401 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, | |
402 | (char*)&rcv, sizeof(rcv)); | |
403 | #else | |
404 | /* sock_setsockopt limits use to sysctl_?mem_max, | |
405 | * which isn't acceptable. Until that is made conditional | |
406 | * on not having CAP_SYS_RESOURCE or similar, we go direct... | |
407 | * DaveM said I could! | |
408 | */ | |
409 | lock_sock(sock->sk); | |
410 | sock->sk->sk_sndbuf = snd * 2; | |
411 | sock->sk->sk_rcvbuf = rcv * 2; | |
412 | sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK; | |
413 | sock->sk->sk_write_space(sock->sk); | |
414 | release_sock(sock->sk); | |
415 | #endif | |
416 | } | |
417 | /* | |
418 | * INET callback when data has been received on the socket. | |
419 | */ | |
420 | static void svc_udp_data_ready(struct sock *sk, int count) | |
421 | { | |
422 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; | |
423 | wait_queue_head_t *wq = sk_sleep(sk); | |
424 | ||
425 | if (svsk) { | |
426 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", | |
427 | svsk, sk, count, | |
428 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
429 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
430 | svc_xprt_enqueue(&svsk->sk_xprt); | |
431 | } | |
432 | if (wq && waitqueue_active(wq)) | |
433 | wake_up_interruptible(wq); | |
434 | } | |
435 | ||
436 | /* | |
437 | * INET callback when space is newly available on the socket. | |
438 | */ | |
439 | static void svc_write_space(struct sock *sk) | |
440 | { | |
441 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); | |
442 | wait_queue_head_t *wq = sk_sleep(sk); | |
443 | ||
444 | if (svsk) { | |
445 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", | |
446 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); | |
447 | svc_xprt_enqueue(&svsk->sk_xprt); | |
448 | } | |
449 | ||
450 | if (wq && waitqueue_active(wq)) { | |
451 | dprintk("RPC svc_write_space: someone sleeping on %p\n", | |
452 | svsk); | |
453 | wake_up_interruptible(wq); | |
454 | } | |
455 | } | |
456 | ||
457 | static void svc_tcp_write_space(struct sock *sk) | |
458 | { | |
459 | struct socket *sock = sk->sk_socket; | |
460 | ||
461 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) | |
462 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
463 | svc_write_space(sk); | |
464 | } | |
465 | ||
466 | /* | |
467 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo | |
468 | */ | |
469 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, | |
470 | struct cmsghdr *cmh) | |
471 | { | |
472 | struct in_pktinfo *pki = CMSG_DATA(cmh); | |
473 | if (cmh->cmsg_type != IP_PKTINFO) | |
474 | return 0; | |
475 | rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr; | |
476 | return 1; | |
477 | } | |
478 | ||
479 | /* | |
480 | * See net/ipv6/datagram.c : datagram_recv_ctl | |
481 | */ | |
482 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, | |
483 | struct cmsghdr *cmh) | |
484 | { | |
485 | struct in6_pktinfo *pki = CMSG_DATA(cmh); | |
486 | if (cmh->cmsg_type != IPV6_PKTINFO) | |
487 | return 0; | |
488 | ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr); | |
489 | return 1; | |
490 | } | |
491 | ||
492 | /* | |
493 | * Copy the UDP datagram's destination address to the rqstp structure. | |
494 | * The 'destination' address in this case is the address to which the | |
495 | * peer sent the datagram, i.e. our local address. For multihomed | |
496 | * hosts, this can change from msg to msg. Note that only the IP | |
497 | * address changes, the port number should remain the same. | |
498 | */ | |
499 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, | |
500 | struct cmsghdr *cmh) | |
501 | { | |
502 | switch (cmh->cmsg_level) { | |
503 | case SOL_IP: | |
504 | return svc_udp_get_dest_address4(rqstp, cmh); | |
505 | case SOL_IPV6: | |
506 | return svc_udp_get_dest_address6(rqstp, cmh); | |
507 | } | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Receive a datagram from a UDP socket. | |
514 | */ | |
515 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) | |
516 | { | |
517 | struct svc_sock *svsk = | |
518 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
519 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
520 | struct sk_buff *skb; | |
521 | union { | |
522 | struct cmsghdr hdr; | |
523 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; | |
524 | } buffer; | |
525 | struct cmsghdr *cmh = &buffer.hdr; | |
526 | struct msghdr msg = { | |
527 | .msg_name = svc_addr(rqstp), | |
528 | .msg_control = cmh, | |
529 | .msg_controllen = sizeof(buffer), | |
530 | .msg_flags = MSG_DONTWAIT, | |
531 | }; | |
532 | size_t len; | |
533 | int err; | |
534 | ||
535 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) | |
536 | /* udp sockets need large rcvbuf as all pending | |
537 | * requests are still in that buffer. sndbuf must | |
538 | * also be large enough that there is enough space | |
539 | * for one reply per thread. We count all threads | |
540 | * rather than threads in a particular pool, which | |
541 | * provides an upper bound on the number of threads | |
542 | * which will access the socket. | |
543 | */ | |
544 | svc_sock_setbufsize(svsk->sk_sock, | |
545 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, | |
546 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); | |
547 | ||
548 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
549 | skb = NULL; | |
550 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, | |
551 | 0, 0, MSG_PEEK | MSG_DONTWAIT); | |
552 | if (err >= 0) | |
553 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); | |
554 | ||
555 | if (skb == NULL) { | |
556 | if (err != -EAGAIN) { | |
557 | /* possibly an icmp error */ | |
558 | dprintk("svc: recvfrom returned error %d\n", -err); | |
559 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
560 | } | |
561 | return -EAGAIN; | |
562 | } | |
563 | len = svc_addr_len(svc_addr(rqstp)); | |
564 | if (len == 0) | |
565 | return -EAFNOSUPPORT; | |
566 | rqstp->rq_addrlen = len; | |
567 | if (skb->tstamp.tv64 == 0) { | |
568 | skb->tstamp = ktime_get_real(); | |
569 | /* Don't enable netstamp, sunrpc doesn't | |
570 | need that much accuracy */ | |
571 | } | |
572 | svsk->sk_sk->sk_stamp = skb->tstamp; | |
573 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ | |
574 | ||
575 | len = skb->len - sizeof(struct udphdr); | |
576 | rqstp->rq_arg.len = len; | |
577 | ||
578 | rqstp->rq_prot = IPPROTO_UDP; | |
579 | ||
580 | if (!svc_udp_get_dest_address(rqstp, cmh)) { | |
581 | if (net_ratelimit()) | |
582 | printk(KERN_WARNING | |
583 | "svc: received unknown control message %d/%d; " | |
584 | "dropping RPC reply datagram\n", | |
585 | cmh->cmsg_level, cmh->cmsg_type); | |
586 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
587 | return 0; | |
588 | } | |
589 | ||
590 | if (skb_is_nonlinear(skb)) { | |
591 | /* we have to copy */ | |
592 | local_bh_disable(); | |
593 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { | |
594 | local_bh_enable(); | |
595 | /* checksum error */ | |
596 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
597 | return 0; | |
598 | } | |
599 | local_bh_enable(); | |
600 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
601 | } else { | |
602 | /* we can use it in-place */ | |
603 | rqstp->rq_arg.head[0].iov_base = skb->data + | |
604 | sizeof(struct udphdr); | |
605 | rqstp->rq_arg.head[0].iov_len = len; | |
606 | if (skb_checksum_complete(skb)) { | |
607 | skb_free_datagram_locked(svsk->sk_sk, skb); | |
608 | return 0; | |
609 | } | |
610 | rqstp->rq_xprt_ctxt = skb; | |
611 | } | |
612 | ||
613 | rqstp->rq_arg.page_base = 0; | |
614 | if (len <= rqstp->rq_arg.head[0].iov_len) { | |
615 | rqstp->rq_arg.head[0].iov_len = len; | |
616 | rqstp->rq_arg.page_len = 0; | |
617 | rqstp->rq_respages = rqstp->rq_pages+1; | |
618 | } else { | |
619 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; | |
620 | rqstp->rq_respages = rqstp->rq_pages + 1 + | |
621 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); | |
622 | } | |
623 | ||
624 | if (serv->sv_stats) | |
625 | serv->sv_stats->netudpcnt++; | |
626 | ||
627 | return len; | |
628 | } | |
629 | ||
630 | static int | |
631 | svc_udp_sendto(struct svc_rqst *rqstp) | |
632 | { | |
633 | int error; | |
634 | ||
635 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
636 | if (error == -ECONNREFUSED) | |
637 | /* ICMP error on earlier request. */ | |
638 | error = svc_sendto(rqstp, &rqstp->rq_res); | |
639 | ||
640 | return error; | |
641 | } | |
642 | ||
643 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) | |
644 | { | |
645 | } | |
646 | ||
647 | static int svc_udp_has_wspace(struct svc_xprt *xprt) | |
648 | { | |
649 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
650 | struct svc_serv *serv = xprt->xpt_server; | |
651 | unsigned long required; | |
652 | ||
653 | /* | |
654 | * Set the SOCK_NOSPACE flag before checking the available | |
655 | * sock space. | |
656 | */ | |
657 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
658 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; | |
659 | if (required*2 > sock_wspace(svsk->sk_sk)) | |
660 | return 0; | |
661 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
662 | return 1; | |
663 | } | |
664 | ||
665 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) | |
666 | { | |
667 | BUG(); | |
668 | return NULL; | |
669 | } | |
670 | ||
671 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, | |
672 | struct net *net, | |
673 | struct sockaddr *sa, int salen, | |
674 | int flags) | |
675 | { | |
676 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); | |
677 | } | |
678 | ||
679 | static struct svc_xprt_ops svc_udp_ops = { | |
680 | .xpo_create = svc_udp_create, | |
681 | .xpo_recvfrom = svc_udp_recvfrom, | |
682 | .xpo_sendto = svc_udp_sendto, | |
683 | .xpo_release_rqst = svc_release_skb, | |
684 | .xpo_detach = svc_sock_detach, | |
685 | .xpo_free = svc_sock_free, | |
686 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, | |
687 | .xpo_has_wspace = svc_udp_has_wspace, | |
688 | .xpo_accept = svc_udp_accept, | |
689 | }; | |
690 | ||
691 | static struct svc_xprt_class svc_udp_class = { | |
692 | .xcl_name = "udp", | |
693 | .xcl_owner = THIS_MODULE, | |
694 | .xcl_ops = &svc_udp_ops, | |
695 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, | |
696 | }; | |
697 | ||
698 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) | |
699 | { | |
700 | int err, level, optname, one = 1; | |
701 | ||
702 | svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv); | |
703 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); | |
704 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; | |
705 | svsk->sk_sk->sk_write_space = svc_write_space; | |
706 | ||
707 | /* initialise setting must have enough space to | |
708 | * receive and respond to one request. | |
709 | * svc_udp_recvfrom will re-adjust if necessary | |
710 | */ | |
711 | svc_sock_setbufsize(svsk->sk_sock, | |
712 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, | |
713 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
714 | ||
715 | /* data might have come in before data_ready set up */ | |
716 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
717 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); | |
718 | ||
719 | /* make sure we get destination address info */ | |
720 | switch (svsk->sk_sk->sk_family) { | |
721 | case AF_INET: | |
722 | level = SOL_IP; | |
723 | optname = IP_PKTINFO; | |
724 | break; | |
725 | case AF_INET6: | |
726 | level = SOL_IPV6; | |
727 | optname = IPV6_RECVPKTINFO; | |
728 | break; | |
729 | default: | |
730 | BUG(); | |
731 | } | |
732 | err = kernel_setsockopt(svsk->sk_sock, level, optname, | |
733 | (char *)&one, sizeof(one)); | |
734 | dprintk("svc: kernel_setsockopt returned %d\n", err); | |
735 | } | |
736 | ||
737 | /* | |
738 | * A data_ready event on a listening socket means there's a connection | |
739 | * pending. Do not use state_change as a substitute for it. | |
740 | */ | |
741 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) | |
742 | { | |
743 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; | |
744 | wait_queue_head_t *wq; | |
745 | ||
746 | dprintk("svc: socket %p TCP (listen) state change %d\n", | |
747 | sk, sk->sk_state); | |
748 | ||
749 | /* | |
750 | * This callback may called twice when a new connection | |
751 | * is established as a child socket inherits everything | |
752 | * from a parent LISTEN socket. | |
753 | * 1) data_ready method of the parent socket will be called | |
754 | * when one of child sockets become ESTABLISHED. | |
755 | * 2) data_ready method of the child socket may be called | |
756 | * when it receives data before the socket is accepted. | |
757 | * In case of 2, we should ignore it silently. | |
758 | */ | |
759 | if (sk->sk_state == TCP_LISTEN) { | |
760 | if (svsk) { | |
761 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); | |
762 | svc_xprt_enqueue(&svsk->sk_xprt); | |
763 | } else | |
764 | printk("svc: socket %p: no user data\n", sk); | |
765 | } | |
766 | ||
767 | wq = sk_sleep(sk); | |
768 | if (wq && waitqueue_active(wq)) | |
769 | wake_up_interruptible_all(wq); | |
770 | } | |
771 | ||
772 | /* | |
773 | * A state change on a connected socket means it's dying or dead. | |
774 | */ | |
775 | static void svc_tcp_state_change(struct sock *sk) | |
776 | { | |
777 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; | |
778 | wait_queue_head_t *wq = sk_sleep(sk); | |
779 | ||
780 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", | |
781 | sk, sk->sk_state, sk->sk_user_data); | |
782 | ||
783 | if (!svsk) | |
784 | printk("svc: socket %p: no user data\n", sk); | |
785 | else { | |
786 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
787 | svc_xprt_enqueue(&svsk->sk_xprt); | |
788 | } | |
789 | if (wq && waitqueue_active(wq)) | |
790 | wake_up_interruptible_all(wq); | |
791 | } | |
792 | ||
793 | static void svc_tcp_data_ready(struct sock *sk, int count) | |
794 | { | |
795 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; | |
796 | wait_queue_head_t *wq = sk_sleep(sk); | |
797 | ||
798 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", | |
799 | sk, sk->sk_user_data); | |
800 | if (svsk) { | |
801 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
802 | svc_xprt_enqueue(&svsk->sk_xprt); | |
803 | } | |
804 | if (wq && waitqueue_active(wq)) | |
805 | wake_up_interruptible(wq); | |
806 | } | |
807 | ||
808 | /* | |
809 | * Accept a TCP connection | |
810 | */ | |
811 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) | |
812 | { | |
813 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
814 | struct sockaddr_storage addr; | |
815 | struct sockaddr *sin = (struct sockaddr *) &addr; | |
816 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
817 | struct socket *sock = svsk->sk_sock; | |
818 | struct socket *newsock; | |
819 | struct svc_sock *newsvsk; | |
820 | int err, slen; | |
821 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
822 | ||
823 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); | |
824 | if (!sock) | |
825 | return NULL; | |
826 | ||
827 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); | |
828 | err = kernel_accept(sock, &newsock, O_NONBLOCK); | |
829 | if (err < 0) { | |
830 | if (err == -ENOMEM) | |
831 | printk(KERN_WARNING "%s: no more sockets!\n", | |
832 | serv->sv_name); | |
833 | else if (err != -EAGAIN && net_ratelimit()) | |
834 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", | |
835 | serv->sv_name, -err); | |
836 | return NULL; | |
837 | } | |
838 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); | |
839 | ||
840 | err = kernel_getpeername(newsock, sin, &slen); | |
841 | if (err < 0) { | |
842 | if (net_ratelimit()) | |
843 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", | |
844 | serv->sv_name, -err); | |
845 | goto failed; /* aborted connection or whatever */ | |
846 | } | |
847 | ||
848 | /* Ideally, we would want to reject connections from unauthorized | |
849 | * hosts here, but when we get encryption, the IP of the host won't | |
850 | * tell us anything. For now just warn about unpriv connections. | |
851 | */ | |
852 | if (!svc_port_is_privileged(sin)) { | |
853 | dprintk(KERN_WARNING | |
854 | "%s: connect from unprivileged port: %s\n", | |
855 | serv->sv_name, | |
856 | __svc_print_addr(sin, buf, sizeof(buf))); | |
857 | } | |
858 | dprintk("%s: connect from %s\n", serv->sv_name, | |
859 | __svc_print_addr(sin, buf, sizeof(buf))); | |
860 | ||
861 | /* make sure that a write doesn't block forever when | |
862 | * low on memory | |
863 | */ | |
864 | newsock->sk->sk_sndtimeo = HZ*30; | |
865 | ||
866 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, | |
867 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) | |
868 | goto failed; | |
869 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); | |
870 | err = kernel_getsockname(newsock, sin, &slen); | |
871 | if (unlikely(err < 0)) { | |
872 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); | |
873 | slen = offsetof(struct sockaddr, sa_data); | |
874 | } | |
875 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); | |
876 | ||
877 | if (serv->sv_stats) | |
878 | serv->sv_stats->nettcpconn++; | |
879 | ||
880 | return &newsvsk->sk_xprt; | |
881 | ||
882 | failed: | |
883 | sock_release(newsock); | |
884 | return NULL; | |
885 | } | |
886 | ||
887 | /* | |
888 | * Receive data. | |
889 | * If we haven't gotten the record length yet, get the next four bytes. | |
890 | * Otherwise try to gobble up as much as possible up to the complete | |
891 | * record length. | |
892 | */ | |
893 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
894 | { | |
895 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
896 | unsigned int want; | |
897 | int len; | |
898 | ||
899 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) | |
900 | /* sndbuf needs to have room for one request | |
901 | * per thread, otherwise we can stall even when the | |
902 | * network isn't a bottleneck. | |
903 | * | |
904 | * We count all threads rather than threads in a | |
905 | * particular pool, which provides an upper bound | |
906 | * on the number of threads which will access the socket. | |
907 | * | |
908 | * rcvbuf just needs to be able to hold a few requests. | |
909 | * Normally they will be removed from the queue | |
910 | * as soon a a complete request arrives. | |
911 | */ | |
912 | svc_sock_setbufsize(svsk->sk_sock, | |
913 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, | |
914 | 3 * serv->sv_max_mesg); | |
915 | ||
916 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
917 | ||
918 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { | |
919 | struct kvec iov; | |
920 | ||
921 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; | |
922 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; | |
923 | iov.iov_len = want; | |
924 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) | |
925 | goto error; | |
926 | svsk->sk_tcplen += len; | |
927 | ||
928 | if (len < want) { | |
929 | dprintk("svc: short recvfrom while reading record " | |
930 | "length (%d of %d)\n", len, want); | |
931 | goto err_again; /* record header not complete */ | |
932 | } | |
933 | ||
934 | svsk->sk_reclen = ntohl(svsk->sk_reclen); | |
935 | if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { | |
936 | /* FIXME: technically, a record can be fragmented, | |
937 | * and non-terminal fragments will not have the top | |
938 | * bit set in the fragment length header. | |
939 | * But apparently no known nfs clients send fragmented | |
940 | * records. */ | |
941 | if (net_ratelimit()) | |
942 | printk(KERN_NOTICE "RPC: multiple fragments " | |
943 | "per record not supported\n"); | |
944 | goto err_delete; | |
945 | } | |
946 | ||
947 | svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; | |
948 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); | |
949 | if (svsk->sk_reclen > serv->sv_max_mesg) { | |
950 | if (net_ratelimit()) | |
951 | printk(KERN_NOTICE "RPC: " | |
952 | "fragment too large: 0x%08lx\n", | |
953 | (unsigned long)svsk->sk_reclen); | |
954 | goto err_delete; | |
955 | } | |
956 | } | |
957 | ||
958 | if (svsk->sk_reclen < 8) | |
959 | goto err_delete; /* client is nuts. */ | |
960 | ||
961 | /* Check whether enough data is available */ | |
962 | len = svc_recv_available(svsk); | |
963 | if (len < 0) | |
964 | goto error; | |
965 | ||
966 | if (len < svsk->sk_reclen) { | |
967 | dprintk("svc: incomplete TCP record (%d of %d)\n", | |
968 | len, svsk->sk_reclen); | |
969 | goto err_again; /* record not complete */ | |
970 | } | |
971 | len = svsk->sk_reclen; | |
972 | ||
973 | return len; | |
974 | error: | |
975 | if (len == -EAGAIN) | |
976 | dprintk("RPC: TCP recv_record got EAGAIN\n"); | |
977 | return len; | |
978 | err_delete: | |
979 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
980 | err_again: | |
981 | return -EAGAIN; | |
982 | } | |
983 | ||
984 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) | |
985 | { | |
986 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; | |
987 | struct rpc_rqst *req = NULL; | |
988 | struct kvec *src, *dst; | |
989 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
990 | __be32 xid; | |
991 | __be32 calldir; | |
992 | ||
993 | xid = *p++; | |
994 | calldir = *p; | |
995 | ||
996 | if (bc_xprt) | |
997 | req = xprt_lookup_rqst(bc_xprt, xid); | |
998 | ||
999 | if (!req) { | |
1000 | printk(KERN_NOTICE | |
1001 | "%s: Got unrecognized reply: " | |
1002 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", | |
1003 | __func__, ntohl(calldir), | |
1004 | bc_xprt, xid); | |
1005 | return -EAGAIN; | |
1006 | } | |
1007 | ||
1008 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); | |
1009 | /* | |
1010 | * XXX!: cheating for now! Only copying HEAD. | |
1011 | * But we know this is good enough for now (in fact, for any | |
1012 | * callback reply in the forseeable future). | |
1013 | */ | |
1014 | dst = &req->rq_private_buf.head[0]; | |
1015 | src = &rqstp->rq_arg.head[0]; | |
1016 | if (dst->iov_len < src->iov_len) | |
1017 | return -EAGAIN; /* whatever; just giving up. */ | |
1018 | memcpy(dst->iov_base, src->iov_base, src->iov_len); | |
1019 | xprt_complete_rqst(req->rq_task, svsk->sk_reclen); | |
1020 | rqstp->rq_arg.len = 0; | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) | |
1025 | { | |
1026 | int i = 0; | |
1027 | int t = 0; | |
1028 | ||
1029 | while (t < len) { | |
1030 | vec[i].iov_base = page_address(pages[i]); | |
1031 | vec[i].iov_len = PAGE_SIZE; | |
1032 | i++; | |
1033 | t += PAGE_SIZE; | |
1034 | } | |
1035 | return i; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Receive data from a TCP socket. | |
1040 | */ | |
1041 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) | |
1042 | { | |
1043 | struct svc_sock *svsk = | |
1044 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); | |
1045 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1046 | int len; | |
1047 | struct kvec *vec; | |
1048 | __be32 *p; | |
1049 | __be32 calldir; | |
1050 | int pnum; | |
1051 | ||
1052 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", | |
1053 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), | |
1054 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), | |
1055 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); | |
1056 | ||
1057 | len = svc_tcp_recv_record(svsk, rqstp); | |
1058 | if (len < 0) | |
1059 | goto error; | |
1060 | ||
1061 | vec = rqstp->rq_vec; | |
1062 | ||
1063 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], | |
1064 | svsk->sk_reclen); | |
1065 | ||
1066 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; | |
1067 | ||
1068 | /* Now receive data */ | |
1069 | len = svc_recvfrom(rqstp, vec, pnum, svsk->sk_reclen); | |
1070 | if (len < 0) | |
1071 | goto err_again; | |
1072 | ||
1073 | dprintk("svc: TCP complete record (%d bytes)\n", svsk->sk_reclen); | |
1074 | rqstp->rq_arg.len = svsk->sk_reclen; | |
1075 | rqstp->rq_arg.page_base = 0; | |
1076 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { | |
1077 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; | |
1078 | rqstp->rq_arg.page_len = 0; | |
1079 | } else | |
1080 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; | |
1081 | ||
1082 | rqstp->rq_xprt_ctxt = NULL; | |
1083 | rqstp->rq_prot = IPPROTO_TCP; | |
1084 | ||
1085 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; | |
1086 | calldir = p[1]; | |
1087 | if (calldir) { | |
1088 | len = receive_cb_reply(svsk, rqstp); | |
1089 | if (len < 0) | |
1090 | goto err_again; | |
1091 | } | |
1092 | ||
1093 | /* Reset TCP read info */ | |
1094 | svsk->sk_reclen = 0; | |
1095 | svsk->sk_tcplen = 0; | |
1096 | /* If we have more data, signal svc_xprt_enqueue() to try again */ | |
1097 | if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) | |
1098 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1099 | ||
1100 | ||
1101 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); | |
1102 | if (serv->sv_stats) | |
1103 | serv->sv_stats->nettcpcnt++; | |
1104 | ||
1105 | return rqstp->rq_arg.len; | |
1106 | ||
1107 | err_again: | |
1108 | if (len == -EAGAIN) { | |
1109 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); | |
1110 | return len; | |
1111 | } | |
1112 | error: | |
1113 | if (len != -EAGAIN) { | |
1114 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", | |
1115 | svsk->sk_xprt.xpt_server->sv_name, -len); | |
1116 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1117 | } | |
1118 | return -EAGAIN; | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Send out data on TCP socket. | |
1123 | */ | |
1124 | static int svc_tcp_sendto(struct svc_rqst *rqstp) | |
1125 | { | |
1126 | struct xdr_buf *xbufp = &rqstp->rq_res; | |
1127 | int sent; | |
1128 | __be32 reclen; | |
1129 | ||
1130 | /* Set up the first element of the reply kvec. | |
1131 | * Any other kvecs that may be in use have been taken | |
1132 | * care of by the server implementation itself. | |
1133 | */ | |
1134 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); | |
1135 | memcpy(xbufp->head[0].iov_base, &reclen, 4); | |
1136 | ||
1137 | sent = svc_sendto(rqstp, &rqstp->rq_res); | |
1138 | if (sent != xbufp->len) { | |
1139 | printk(KERN_NOTICE | |
1140 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " | |
1141 | "- shutting down socket\n", | |
1142 | rqstp->rq_xprt->xpt_server->sv_name, | |
1143 | (sent<0)?"got error":"sent only", | |
1144 | sent, xbufp->len); | |
1145 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); | |
1146 | svc_xprt_enqueue(rqstp->rq_xprt); | |
1147 | sent = -EAGAIN; | |
1148 | } | |
1149 | return sent; | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * Setup response header. TCP has a 4B record length field. | |
1154 | */ | |
1155 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) | |
1156 | { | |
1157 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
1158 | ||
1159 | /* tcp needs a space for the record length... */ | |
1160 | svc_putnl(resv, 0); | |
1161 | } | |
1162 | ||
1163 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) | |
1164 | { | |
1165 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1166 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; | |
1167 | int required; | |
1168 | ||
1169 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
1170 | return 1; | |
1171 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; | |
1172 | if (sk_stream_wspace(svsk->sk_sk) >= required) | |
1173 | return 1; | |
1174 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); | |
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, | |
1179 | struct net *net, | |
1180 | struct sockaddr *sa, int salen, | |
1181 | int flags) | |
1182 | { | |
1183 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1184 | } | |
1185 | ||
1186 | #if defined(CONFIG_NFS_V4_1) | |
1187 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, | |
1188 | struct net *, struct sockaddr *, | |
1189 | int, int); | |
1190 | static void svc_bc_sock_free(struct svc_xprt *xprt); | |
1191 | ||
1192 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, | |
1193 | struct net *net, | |
1194 | struct sockaddr *sa, int salen, | |
1195 | int flags) | |
1196 | { | |
1197 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); | |
1198 | } | |
1199 | ||
1200 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) | |
1201 | { | |
1202 | } | |
1203 | ||
1204 | static struct svc_xprt_ops svc_tcp_bc_ops = { | |
1205 | .xpo_create = svc_bc_tcp_create, | |
1206 | .xpo_detach = svc_bc_tcp_sock_detach, | |
1207 | .xpo_free = svc_bc_sock_free, | |
1208 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
1209 | }; | |
1210 | ||
1211 | static struct svc_xprt_class svc_tcp_bc_class = { | |
1212 | .xcl_name = "tcp-bc", | |
1213 | .xcl_owner = THIS_MODULE, | |
1214 | .xcl_ops = &svc_tcp_bc_ops, | |
1215 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1216 | }; | |
1217 | ||
1218 | static void svc_init_bc_xprt_sock(void) | |
1219 | { | |
1220 | svc_reg_xprt_class(&svc_tcp_bc_class); | |
1221 | } | |
1222 | ||
1223 | static void svc_cleanup_bc_xprt_sock(void) | |
1224 | { | |
1225 | svc_unreg_xprt_class(&svc_tcp_bc_class); | |
1226 | } | |
1227 | #else /* CONFIG_NFS_V4_1 */ | |
1228 | static void svc_init_bc_xprt_sock(void) | |
1229 | { | |
1230 | } | |
1231 | ||
1232 | static void svc_cleanup_bc_xprt_sock(void) | |
1233 | { | |
1234 | } | |
1235 | #endif /* CONFIG_NFS_V4_1 */ | |
1236 | ||
1237 | static struct svc_xprt_ops svc_tcp_ops = { | |
1238 | .xpo_create = svc_tcp_create, | |
1239 | .xpo_recvfrom = svc_tcp_recvfrom, | |
1240 | .xpo_sendto = svc_tcp_sendto, | |
1241 | .xpo_release_rqst = svc_release_skb, | |
1242 | .xpo_detach = svc_tcp_sock_detach, | |
1243 | .xpo_free = svc_sock_free, | |
1244 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, | |
1245 | .xpo_has_wspace = svc_tcp_has_wspace, | |
1246 | .xpo_accept = svc_tcp_accept, | |
1247 | }; | |
1248 | ||
1249 | static struct svc_xprt_class svc_tcp_class = { | |
1250 | .xcl_name = "tcp", | |
1251 | .xcl_owner = THIS_MODULE, | |
1252 | .xcl_ops = &svc_tcp_ops, | |
1253 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
1254 | }; | |
1255 | ||
1256 | void svc_init_xprt_sock(void) | |
1257 | { | |
1258 | svc_reg_xprt_class(&svc_tcp_class); | |
1259 | svc_reg_xprt_class(&svc_udp_class); | |
1260 | svc_init_bc_xprt_sock(); | |
1261 | } | |
1262 | ||
1263 | void svc_cleanup_xprt_sock(void) | |
1264 | { | |
1265 | svc_unreg_xprt_class(&svc_tcp_class); | |
1266 | svc_unreg_xprt_class(&svc_udp_class); | |
1267 | svc_cleanup_bc_xprt_sock(); | |
1268 | } | |
1269 | ||
1270 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) | |
1271 | { | |
1272 | struct sock *sk = svsk->sk_sk; | |
1273 | ||
1274 | svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv); | |
1275 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); | |
1276 | if (sk->sk_state == TCP_LISTEN) { | |
1277 | dprintk("setting up TCP socket for listening\n"); | |
1278 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); | |
1279 | sk->sk_data_ready = svc_tcp_listen_data_ready; | |
1280 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); | |
1281 | } else { | |
1282 | dprintk("setting up TCP socket for reading\n"); | |
1283 | sk->sk_state_change = svc_tcp_state_change; | |
1284 | sk->sk_data_ready = svc_tcp_data_ready; | |
1285 | sk->sk_write_space = svc_tcp_write_space; | |
1286 | ||
1287 | svsk->sk_reclen = 0; | |
1288 | svsk->sk_tcplen = 0; | |
1289 | ||
1290 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
1291 | ||
1292 | /* initialise setting must have enough space to | |
1293 | * receive and respond to one request. | |
1294 | * svc_tcp_recvfrom will re-adjust if necessary | |
1295 | */ | |
1296 | svc_sock_setbufsize(svsk->sk_sock, | |
1297 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, | |
1298 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); | |
1299 | ||
1300 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); | |
1301 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); | |
1302 | if (sk->sk_state != TCP_ESTABLISHED) | |
1303 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); | |
1304 | } | |
1305 | } | |
1306 | ||
1307 | void svc_sock_update_bufs(struct svc_serv *serv) | |
1308 | { | |
1309 | /* | |
1310 | * The number of server threads has changed. Update | |
1311 | * rcvbuf and sndbuf accordingly on all sockets | |
1312 | */ | |
1313 | struct svc_sock *svsk; | |
1314 | ||
1315 | spin_lock_bh(&serv->sv_lock); | |
1316 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) | |
1317 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); | |
1318 | list_for_each_entry(svsk, &serv->sv_tempsocks, sk_xprt.xpt_list) | |
1319 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); | |
1320 | spin_unlock_bh(&serv->sv_lock); | |
1321 | } | |
1322 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); | |
1323 | ||
1324 | /* | |
1325 | * Initialize socket for RPC use and create svc_sock struct | |
1326 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. | |
1327 | */ | |
1328 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, | |
1329 | struct socket *sock, | |
1330 | int *errp, int flags) | |
1331 | { | |
1332 | struct svc_sock *svsk; | |
1333 | struct sock *inet; | |
1334 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); | |
1335 | ||
1336 | dprintk("svc: svc_setup_socket %p\n", sock); | |
1337 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { | |
1338 | *errp = -ENOMEM; | |
1339 | return NULL; | |
1340 | } | |
1341 | ||
1342 | inet = sock->sk; | |
1343 | ||
1344 | /* Register socket with portmapper */ | |
1345 | if (*errp >= 0 && pmap_register) | |
1346 | *errp = svc_register(serv, inet->sk_family, inet->sk_protocol, | |
1347 | ntohs(inet_sk(inet)->inet_sport)); | |
1348 | ||
1349 | if (*errp < 0) { | |
1350 | kfree(svsk); | |
1351 | return NULL; | |
1352 | } | |
1353 | ||
1354 | inet->sk_user_data = svsk; | |
1355 | svsk->sk_sock = sock; | |
1356 | svsk->sk_sk = inet; | |
1357 | svsk->sk_ostate = inet->sk_state_change; | |
1358 | svsk->sk_odata = inet->sk_data_ready; | |
1359 | svsk->sk_owspace = inet->sk_write_space; | |
1360 | ||
1361 | /* Initialize the socket */ | |
1362 | if (sock->type == SOCK_DGRAM) | |
1363 | svc_udp_init(svsk, serv); | |
1364 | else | |
1365 | svc_tcp_init(svsk, serv); | |
1366 | ||
1367 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", | |
1368 | svsk, svsk->sk_sk); | |
1369 | ||
1370 | return svsk; | |
1371 | } | |
1372 | ||
1373 | /** | |
1374 | * svc_addsock - add a listener socket to an RPC service | |
1375 | * @serv: pointer to RPC service to which to add a new listener | |
1376 | * @fd: file descriptor of the new listener | |
1377 | * @name_return: pointer to buffer to fill in with name of listener | |
1378 | * @len: size of the buffer | |
1379 | * | |
1380 | * Fills in socket name and returns positive length of name if successful. | |
1381 | * Name is terminated with '\n'. On error, returns a negative errno | |
1382 | * value. | |
1383 | */ | |
1384 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, | |
1385 | const size_t len) | |
1386 | { | |
1387 | int err = 0; | |
1388 | struct socket *so = sockfd_lookup(fd, &err); | |
1389 | struct svc_sock *svsk = NULL; | |
1390 | ||
1391 | if (!so) | |
1392 | return err; | |
1393 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) | |
1394 | err = -EAFNOSUPPORT; | |
1395 | else if (so->sk->sk_protocol != IPPROTO_TCP && | |
1396 | so->sk->sk_protocol != IPPROTO_UDP) | |
1397 | err = -EPROTONOSUPPORT; | |
1398 | else if (so->state > SS_UNCONNECTED) | |
1399 | err = -EISCONN; | |
1400 | else { | |
1401 | if (!try_module_get(THIS_MODULE)) | |
1402 | err = -ENOENT; | |
1403 | else | |
1404 | svsk = svc_setup_socket(serv, so, &err, | |
1405 | SVC_SOCK_DEFAULTS); | |
1406 | if (svsk) { | |
1407 | struct sockaddr_storage addr; | |
1408 | struct sockaddr *sin = (struct sockaddr *)&addr; | |
1409 | int salen; | |
1410 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) | |
1411 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); | |
1412 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); | |
1413 | spin_lock_bh(&serv->sv_lock); | |
1414 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); | |
1415 | spin_unlock_bh(&serv->sv_lock); | |
1416 | svc_xprt_received(&svsk->sk_xprt); | |
1417 | err = 0; | |
1418 | } else | |
1419 | module_put(THIS_MODULE); | |
1420 | } | |
1421 | if (err) { | |
1422 | sockfd_put(so); | |
1423 | return err; | |
1424 | } | |
1425 | return svc_one_sock_name(svsk, name_return, len); | |
1426 | } | |
1427 | EXPORT_SYMBOL_GPL(svc_addsock); | |
1428 | ||
1429 | /* | |
1430 | * Create socket for RPC service. | |
1431 | */ | |
1432 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, | |
1433 | int protocol, | |
1434 | struct net *net, | |
1435 | struct sockaddr *sin, int len, | |
1436 | int flags) | |
1437 | { | |
1438 | struct svc_sock *svsk; | |
1439 | struct socket *sock; | |
1440 | int error; | |
1441 | int type; | |
1442 | struct sockaddr_storage addr; | |
1443 | struct sockaddr *newsin = (struct sockaddr *)&addr; | |
1444 | int newlen; | |
1445 | int family; | |
1446 | int val; | |
1447 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); | |
1448 | ||
1449 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", | |
1450 | serv->sv_program->pg_name, protocol, | |
1451 | __svc_print_addr(sin, buf, sizeof(buf))); | |
1452 | ||
1453 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { | |
1454 | printk(KERN_WARNING "svc: only UDP and TCP " | |
1455 | "sockets supported\n"); | |
1456 | return ERR_PTR(-EINVAL); | |
1457 | } | |
1458 | ||
1459 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; | |
1460 | switch (sin->sa_family) { | |
1461 | case AF_INET6: | |
1462 | family = PF_INET6; | |
1463 | break; | |
1464 | case AF_INET: | |
1465 | family = PF_INET; | |
1466 | break; | |
1467 | default: | |
1468 | return ERR_PTR(-EINVAL); | |
1469 | } | |
1470 | ||
1471 | error = __sock_create(net, family, type, protocol, &sock, 1); | |
1472 | if (error < 0) | |
1473 | return ERR_PTR(error); | |
1474 | ||
1475 | svc_reclassify_socket(sock); | |
1476 | ||
1477 | /* | |
1478 | * If this is an PF_INET6 listener, we want to avoid | |
1479 | * getting requests from IPv4 remotes. Those should | |
1480 | * be shunted to a PF_INET listener via rpcbind. | |
1481 | */ | |
1482 | val = 1; | |
1483 | if (family == PF_INET6) | |
1484 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, | |
1485 | (char *)&val, sizeof(val)); | |
1486 | ||
1487 | if (type == SOCK_STREAM) | |
1488 | sock->sk->sk_reuse = 1; /* allow address reuse */ | |
1489 | error = kernel_bind(sock, sin, len); | |
1490 | if (error < 0) | |
1491 | goto bummer; | |
1492 | ||
1493 | newlen = len; | |
1494 | error = kernel_getsockname(sock, newsin, &newlen); | |
1495 | if (error < 0) | |
1496 | goto bummer; | |
1497 | ||
1498 | if (protocol == IPPROTO_TCP) { | |
1499 | if ((error = kernel_listen(sock, 64)) < 0) | |
1500 | goto bummer; | |
1501 | } | |
1502 | ||
1503 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { | |
1504 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); | |
1505 | return (struct svc_xprt *)svsk; | |
1506 | } | |
1507 | ||
1508 | bummer: | |
1509 | dprintk("svc: svc_create_socket error = %d\n", -error); | |
1510 | sock_release(sock); | |
1511 | return ERR_PTR(error); | |
1512 | } | |
1513 | ||
1514 | /* | |
1515 | * Detach the svc_sock from the socket so that no | |
1516 | * more callbacks occur. | |
1517 | */ | |
1518 | static void svc_sock_detach(struct svc_xprt *xprt) | |
1519 | { | |
1520 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1521 | struct sock *sk = svsk->sk_sk; | |
1522 | wait_queue_head_t *wq; | |
1523 | ||
1524 | dprintk("svc: svc_sock_detach(%p)\n", svsk); | |
1525 | ||
1526 | /* put back the old socket callbacks */ | |
1527 | sk->sk_state_change = svsk->sk_ostate; | |
1528 | sk->sk_data_ready = svsk->sk_odata; | |
1529 | sk->sk_write_space = svsk->sk_owspace; | |
1530 | ||
1531 | wq = sk_sleep(sk); | |
1532 | if (wq && waitqueue_active(wq)) | |
1533 | wake_up_interruptible(wq); | |
1534 | } | |
1535 | ||
1536 | /* | |
1537 | * Disconnect the socket, and reset the callbacks | |
1538 | */ | |
1539 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) | |
1540 | { | |
1541 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1542 | ||
1543 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); | |
1544 | ||
1545 | svc_sock_detach(xprt); | |
1546 | ||
1547 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) | |
1548 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); | |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * Free the svc_sock's socket resources and the svc_sock itself. | |
1553 | */ | |
1554 | static void svc_sock_free(struct svc_xprt *xprt) | |
1555 | { | |
1556 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); | |
1557 | dprintk("svc: svc_sock_free(%p)\n", svsk); | |
1558 | ||
1559 | if (svsk->sk_sock->file) | |
1560 | sockfd_put(svsk->sk_sock); | |
1561 | else | |
1562 | sock_release(svsk->sk_sock); | |
1563 | kfree(svsk); | |
1564 | } | |
1565 | ||
1566 | #if defined(CONFIG_NFS_V4_1) | |
1567 | /* | |
1568 | * Create a back channel svc_xprt which shares the fore channel socket. | |
1569 | */ | |
1570 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, | |
1571 | int protocol, | |
1572 | struct net *net, | |
1573 | struct sockaddr *sin, int len, | |
1574 | int flags) | |
1575 | { | |
1576 | struct svc_sock *svsk; | |
1577 | struct svc_xprt *xprt; | |
1578 | ||
1579 | if (protocol != IPPROTO_TCP) { | |
1580 | printk(KERN_WARNING "svc: only TCP sockets" | |
1581 | " supported on shared back channel\n"); | |
1582 | return ERR_PTR(-EINVAL); | |
1583 | } | |
1584 | ||
1585 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); | |
1586 | if (!svsk) | |
1587 | return ERR_PTR(-ENOMEM); | |
1588 | ||
1589 | xprt = &svsk->sk_xprt; | |
1590 | svc_xprt_init(&svc_tcp_bc_class, xprt, serv); | |
1591 | ||
1592 | serv->sv_bc_xprt = xprt; | |
1593 | ||
1594 | return xprt; | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * Free a back channel svc_sock. | |
1599 | */ | |
1600 | static void svc_bc_sock_free(struct svc_xprt *xprt) | |
1601 | { | |
1602 | if (xprt) | |
1603 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); | |
1604 | } | |
1605 | #endif /* CONFIG_NFS_V4_1 */ |