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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/module.h>
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>
31#include <linux/tcp.h>
32#include <linux/unistd.h>
33#include <linux/slab.h>
34#include <linux/netdevice.h>
35#include <linux/skbuff.h>
36#include <linux/file.h>
37#include <linux/freezer.h>
38#include <net/sock.h>
39#include <net/checksum.h>
40#include <net/ip.h>
41#include <net/ipv6.h>
42#include <net/tcp.h>
43#include <net/tcp_states.h>
44#include <asm/uaccess.h>
45#include <asm/ioctls.h>
46#include <trace/events/skb.h>
47
48#include <linux/sunrpc/types.h>
49#include <linux/sunrpc/clnt.h>
50#include <linux/sunrpc/xdr.h>
51#include <linux/sunrpc/msg_prot.h>
52#include <linux/sunrpc/svcsock.h>
53#include <linux/sunrpc/stats.h>
54#include <linux/sunrpc/xprt.h>
55
56#include "sunrpc.h"
57
58#define RPCDBG_FACILITY RPCDBG_SVCXPRT
59
60
61static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
62 int flags);
63static void svc_udp_data_ready(struct sock *);
64static int svc_udp_recvfrom(struct svc_rqst *);
65static int svc_udp_sendto(struct svc_rqst *);
66static void svc_sock_detach(struct svc_xprt *);
67static void svc_tcp_sock_detach(struct svc_xprt *);
68static void svc_sock_free(struct svc_xprt *);
69
70static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
71 struct net *, struct sockaddr *,
72 int, int);
73#if defined(CONFIG_SUNRPC_BACKCHANNEL)
74static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
75 struct net *, struct sockaddr *,
76 int, int);
77static void svc_bc_sock_free(struct svc_xprt *xprt);
78#endif /* CONFIG_SUNRPC_BACKCHANNEL */
79
80#ifdef CONFIG_DEBUG_LOCK_ALLOC
81static struct lock_class_key svc_key[2];
82static struct lock_class_key svc_slock_key[2];
83
84static void svc_reclassify_socket(struct socket *sock)
85{
86 struct sock *sk = sock->sk;
87
88 WARN_ON_ONCE(sock_owned_by_user(sk));
89 if (sock_owned_by_user(sk))
90 return;
91
92 switch (sk->sk_family) {
93 case AF_INET:
94 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
95 &svc_slock_key[0],
96 "sk_xprt.xpt_lock-AF_INET-NFSD",
97 &svc_key[0]);
98 break;
99
100 case AF_INET6:
101 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
102 &svc_slock_key[1],
103 "sk_xprt.xpt_lock-AF_INET6-NFSD",
104 &svc_key[1]);
105 break;
106
107 default:
108 BUG();
109 }
110}
111#else
112static void svc_reclassify_socket(struct socket *sock)
113{
114}
115#endif
116
117/*
118 * Release an skbuff after use
119 */
120static void svc_release_skb(struct svc_rqst *rqstp)
121{
122 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
123
124 if (skb) {
125 struct svc_sock *svsk =
126 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
127 rqstp->rq_xprt_ctxt = NULL;
128
129 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
130 skb_free_datagram_locked(svsk->sk_sk, skb);
131 }
132}
133
134union svc_pktinfo_u {
135 struct in_pktinfo pkti;
136 struct in6_pktinfo pkti6;
137};
138#define SVC_PKTINFO_SPACE \
139 CMSG_SPACE(sizeof(union svc_pktinfo_u))
140
141static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
142{
143 struct svc_sock *svsk =
144 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
145 switch (svsk->sk_sk->sk_family) {
146 case AF_INET: {
147 struct in_pktinfo *pki = CMSG_DATA(cmh);
148
149 cmh->cmsg_level = SOL_IP;
150 cmh->cmsg_type = IP_PKTINFO;
151 pki->ipi_ifindex = 0;
152 pki->ipi_spec_dst.s_addr =
153 svc_daddr_in(rqstp)->sin_addr.s_addr;
154 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
155 }
156 break;
157
158 case AF_INET6: {
159 struct in6_pktinfo *pki = CMSG_DATA(cmh);
160 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
161
162 cmh->cmsg_level = SOL_IPV6;
163 cmh->cmsg_type = IPV6_PKTINFO;
164 pki->ipi6_ifindex = daddr->sin6_scope_id;
165 pki->ipi6_addr = daddr->sin6_addr;
166 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
167 }
168 break;
169 }
170}
171
172/*
173 * send routine intended to be shared by the fore- and back-channel
174 */
175int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
176 struct page *headpage, unsigned long headoffset,
177 struct page *tailpage, unsigned long tailoffset)
178{
179 int result;
180 int size;
181 struct page **ppage = xdr->pages;
182 size_t base = xdr->page_base;
183 unsigned int pglen = xdr->page_len;
184 unsigned int flags = MSG_MORE | MSG_SENDPAGE_NOTLAST;
185 int slen;
186 int len = 0;
187
188 slen = xdr->len;
189
190 /* send head */
191 if (slen == xdr->head[0].iov_len)
192 flags = 0;
193 len = kernel_sendpage(sock, headpage, headoffset,
194 xdr->head[0].iov_len, flags);
195 if (len != xdr->head[0].iov_len)
196 goto out;
197 slen -= xdr->head[0].iov_len;
198 if (slen == 0)
199 goto out;
200
201 /* send page data */
202 size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
203 while (pglen > 0) {
204 if (slen == size)
205 flags = 0;
206 result = kernel_sendpage(sock, *ppage, base, size, flags);
207 if (result > 0)
208 len += result;
209 if (result != size)
210 goto out;
211 slen -= size;
212 pglen -= size;
213 size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
214 base = 0;
215 ppage++;
216 }
217
218 /* send tail */
219 if (xdr->tail[0].iov_len) {
220 result = kernel_sendpage(sock, tailpage, tailoffset,
221 xdr->tail[0].iov_len, 0);
222 if (result > 0)
223 len += result;
224 }
225
226out:
227 return len;
228}
229
230
231/*
232 * Generic sendto routine
233 */
234static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
235{
236 struct svc_sock *svsk =
237 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
238 struct socket *sock = svsk->sk_sock;
239 union {
240 struct cmsghdr hdr;
241 long all[SVC_PKTINFO_SPACE / sizeof(long)];
242 } buffer;
243 struct cmsghdr *cmh = &buffer.hdr;
244 int len = 0;
245 unsigned long tailoff;
246 unsigned long headoff;
247 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
248
249 if (rqstp->rq_prot == IPPROTO_UDP) {
250 struct msghdr msg = {
251 .msg_name = &rqstp->rq_addr,
252 .msg_namelen = rqstp->rq_addrlen,
253 .msg_control = cmh,
254 .msg_controllen = sizeof(buffer),
255 .msg_flags = MSG_MORE,
256 };
257
258 svc_set_cmsg_data(rqstp, cmh);
259
260 if (sock_sendmsg(sock, &msg) < 0)
261 goto out;
262 }
263
264 tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
265 headoff = 0;
266 len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
267 rqstp->rq_respages[0], tailoff);
268
269out:
270 dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
271 svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
272 xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
273
274 return len;
275}
276
277/*
278 * Report socket names for nfsdfs
279 */
280static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
281{
282 const struct sock *sk = svsk->sk_sk;
283 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
284 "udp" : "tcp";
285 int len;
286
287 switch (sk->sk_family) {
288 case PF_INET:
289 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
290 proto_name,
291 &inet_sk(sk)->inet_rcv_saddr,
292 inet_sk(sk)->inet_num);
293 break;
294#if IS_ENABLED(CONFIG_IPV6)
295 case PF_INET6:
296 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
297 proto_name,
298 &sk->sk_v6_rcv_saddr,
299 inet_sk(sk)->inet_num);
300 break;
301#endif
302 default:
303 len = snprintf(buf, remaining, "*unknown-%d*\n",
304 sk->sk_family);
305 }
306
307 if (len >= remaining) {
308 *buf = '\0';
309 return -ENAMETOOLONG;
310 }
311 return len;
312}
313
314/*
315 * Generic recvfrom routine.
316 */
317static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
318 int buflen)
319{
320 struct svc_sock *svsk =
321 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
322 struct msghdr msg = {
323 .msg_flags = MSG_DONTWAIT,
324 };
325 int len;
326
327 rqstp->rq_xprt_hlen = 0;
328
329 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
330 len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
331 msg.msg_flags);
332 /* If we read a full record, then assume there may be more
333 * data to read (stream based sockets only!)
334 */
335 if (len == buflen)
336 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
337
338 dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
339 svsk, iov[0].iov_base, iov[0].iov_len, len);
340 return len;
341}
342
343static int svc_partial_recvfrom(struct svc_rqst *rqstp,
344 struct kvec *iov, int nr,
345 int buflen, unsigned int base)
346{
347 size_t save_iovlen;
348 void *save_iovbase;
349 unsigned int i;
350 int ret;
351
352 if (base == 0)
353 return svc_recvfrom(rqstp, iov, nr, buflen);
354
355 for (i = 0; i < nr; i++) {
356 if (iov[i].iov_len > base)
357 break;
358 base -= iov[i].iov_len;
359 }
360 save_iovlen = iov[i].iov_len;
361 save_iovbase = iov[i].iov_base;
362 iov[i].iov_len -= base;
363 iov[i].iov_base += base;
364 ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
365 iov[i].iov_len = save_iovlen;
366 iov[i].iov_base = save_iovbase;
367 return ret;
368}
369
370/*
371 * Set socket snd and rcv buffer lengths
372 */
373static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
374 unsigned int rcv)
375{
376#if 0
377 mm_segment_t oldfs;
378 oldfs = get_fs(); set_fs(KERNEL_DS);
379 sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
380 (char*)&snd, sizeof(snd));
381 sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
382 (char*)&rcv, sizeof(rcv));
383#else
384 /* sock_setsockopt limits use to sysctl_?mem_max,
385 * which isn't acceptable. Until that is made conditional
386 * on not having CAP_SYS_RESOURCE or similar, we go direct...
387 * DaveM said I could!
388 */
389 lock_sock(sock->sk);
390 sock->sk->sk_sndbuf = snd * 2;
391 sock->sk->sk_rcvbuf = rcv * 2;
392 sock->sk->sk_write_space(sock->sk);
393 release_sock(sock->sk);
394#endif
395}
396
397static int svc_sock_secure_port(struct svc_rqst *rqstp)
398{
399 return svc_port_is_privileged(svc_addr(rqstp));
400}
401
402static bool sunrpc_waitqueue_active(wait_queue_head_t *wq)
403{
404 if (!wq)
405 return false;
406 /*
407 * There should normally be a memory * barrier here--see
408 * wq_has_sleeper().
409 *
410 * It appears that isn't currently necessary, though, basically
411 * because callers all appear to have sufficient memory barriers
412 * between the time the relevant change is made and the
413 * time they call these callbacks.
414 *
415 * The nfsd code itself doesn't actually explicitly wait on
416 * these waitqueues, but it may wait on them for example in
417 * sendpage() or sendmsg() calls. (And those may be the only
418 * places, since it it uses nonblocking reads.)
419 *
420 * Maybe we should add the memory barriers anyway, but these are
421 * hot paths so we'd need to be convinced there's no sigificant
422 * penalty.
423 */
424 return waitqueue_active(wq);
425}
426
427/*
428 * INET callback when data has been received on the socket.
429 */
430static void svc_udp_data_ready(struct sock *sk)
431{
432 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
433 wait_queue_head_t *wq = sk_sleep(sk);
434
435 if (svsk) {
436 dprintk("svc: socket %p(inet %p), busy=%d\n",
437 svsk, sk,
438 test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
439 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
440 svc_xprt_enqueue(&svsk->sk_xprt);
441 }
442 if (sunrpc_waitqueue_active(wq))
443 wake_up_interruptible(wq);
444}
445
446/*
447 * INET callback when space is newly available on the socket.
448 */
449static void svc_write_space(struct sock *sk)
450{
451 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
452 wait_queue_head_t *wq = sk_sleep(sk);
453
454 if (svsk) {
455 dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
456 svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
457 svc_xprt_enqueue(&svsk->sk_xprt);
458 }
459
460 if (sunrpc_waitqueue_active(wq)) {
461 dprintk("RPC svc_write_space: someone sleeping on %p\n",
462 svsk);
463 wake_up_interruptible(wq);
464 }
465}
466
467static int svc_tcp_has_wspace(struct svc_xprt *xprt)
468{
469 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
470 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
471 int required;
472
473 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
474 return 1;
475 required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
476 if (sk_stream_wspace(svsk->sk_sk) >= required ||
477 (sk_stream_min_wspace(svsk->sk_sk) == 0 &&
478 atomic_read(&xprt->xpt_reserved) == 0))
479 return 1;
480 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
481 return 0;
482}
483
484static void svc_tcp_write_space(struct sock *sk)
485{
486 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
487 struct socket *sock = sk->sk_socket;
488
489 if (!sk_stream_is_writeable(sk) || !sock)
490 return;
491 if (!svsk || svc_tcp_has_wspace(&svsk->sk_xprt))
492 clear_bit(SOCK_NOSPACE, &sock->flags);
493 svc_write_space(sk);
494}
495
496static void svc_tcp_adjust_wspace(struct svc_xprt *xprt)
497{
498 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
499
500 if (svc_tcp_has_wspace(xprt))
501 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
502}
503
504/*
505 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
506 */
507static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
508 struct cmsghdr *cmh)
509{
510 struct in_pktinfo *pki = CMSG_DATA(cmh);
511 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
512
513 if (cmh->cmsg_type != IP_PKTINFO)
514 return 0;
515
516 daddr->sin_family = AF_INET;
517 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
518 return 1;
519}
520
521/*
522 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
523 */
524static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
525 struct cmsghdr *cmh)
526{
527 struct in6_pktinfo *pki = CMSG_DATA(cmh);
528 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
529
530 if (cmh->cmsg_type != IPV6_PKTINFO)
531 return 0;
532
533 daddr->sin6_family = AF_INET6;
534 daddr->sin6_addr = pki->ipi6_addr;
535 daddr->sin6_scope_id = pki->ipi6_ifindex;
536 return 1;
537}
538
539/*
540 * Copy the UDP datagram's destination address to the rqstp structure.
541 * The 'destination' address in this case is the address to which the
542 * peer sent the datagram, i.e. our local address. For multihomed
543 * hosts, this can change from msg to msg. Note that only the IP
544 * address changes, the port number should remain the same.
545 */
546static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
547 struct cmsghdr *cmh)
548{
549 switch (cmh->cmsg_level) {
550 case SOL_IP:
551 return svc_udp_get_dest_address4(rqstp, cmh);
552 case SOL_IPV6:
553 return svc_udp_get_dest_address6(rqstp, cmh);
554 }
555
556 return 0;
557}
558
559/*
560 * Receive a datagram from a UDP socket.
561 */
562static int svc_udp_recvfrom(struct svc_rqst *rqstp)
563{
564 struct svc_sock *svsk =
565 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
566 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
567 struct sk_buff *skb;
568 union {
569 struct cmsghdr hdr;
570 long all[SVC_PKTINFO_SPACE / sizeof(long)];
571 } buffer;
572 struct cmsghdr *cmh = &buffer.hdr;
573 struct msghdr msg = {
574 .msg_name = svc_addr(rqstp),
575 .msg_control = cmh,
576 .msg_controllen = sizeof(buffer),
577 .msg_flags = MSG_DONTWAIT,
578 };
579 size_t len;
580 int err;
581
582 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
583 /* udp sockets need large rcvbuf as all pending
584 * requests are still in that buffer. sndbuf must
585 * also be large enough that there is enough space
586 * for one reply per thread. We count all threads
587 * rather than threads in a particular pool, which
588 * provides an upper bound on the number of threads
589 * which will access the socket.
590 */
591 svc_sock_setbufsize(svsk->sk_sock,
592 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
593 (serv->sv_nrthreads+3) * serv->sv_max_mesg);
594
595 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
596 skb = NULL;
597 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
598 0, 0, MSG_PEEK | MSG_DONTWAIT);
599 if (err >= 0)
600 skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
601
602 if (skb == NULL) {
603 if (err != -EAGAIN) {
604 /* possibly an icmp error */
605 dprintk("svc: recvfrom returned error %d\n", -err);
606 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
607 }
608 return 0;
609 }
610 len = svc_addr_len(svc_addr(rqstp));
611 rqstp->rq_addrlen = len;
612 if (skb->tstamp.tv64 == 0) {
613 skb->tstamp = ktime_get_real();
614 /* Don't enable netstamp, sunrpc doesn't
615 need that much accuracy */
616 }
617 svsk->sk_sk->sk_stamp = skb->tstamp;
618 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
619
620 len = skb->len - sizeof(struct udphdr);
621 rqstp->rq_arg.len = len;
622
623 rqstp->rq_prot = IPPROTO_UDP;
624
625 if (!svc_udp_get_dest_address(rqstp, cmh)) {
626 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
627 cmh->cmsg_level, cmh->cmsg_type);
628 goto out_free;
629 }
630 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
631
632 if (skb_is_nonlinear(skb)) {
633 /* we have to copy */
634 local_bh_disable();
635 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
636 local_bh_enable();
637 /* checksum error */
638 goto out_free;
639 }
640 local_bh_enable();
641 skb_free_datagram_locked(svsk->sk_sk, skb);
642 } else {
643 /* we can use it in-place */
644 rqstp->rq_arg.head[0].iov_base = skb->data +
645 sizeof(struct udphdr);
646 rqstp->rq_arg.head[0].iov_len = len;
647 if (skb_checksum_complete(skb))
648 goto out_free;
649 rqstp->rq_xprt_ctxt = skb;
650 }
651
652 rqstp->rq_arg.page_base = 0;
653 if (len <= rqstp->rq_arg.head[0].iov_len) {
654 rqstp->rq_arg.head[0].iov_len = len;
655 rqstp->rq_arg.page_len = 0;
656 rqstp->rq_respages = rqstp->rq_pages+1;
657 } else {
658 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
659 rqstp->rq_respages = rqstp->rq_pages + 1 +
660 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
661 }
662 rqstp->rq_next_page = rqstp->rq_respages+1;
663
664 if (serv->sv_stats)
665 serv->sv_stats->netudpcnt++;
666
667 return len;
668out_free:
669 trace_kfree_skb(skb, svc_udp_recvfrom);
670 skb_free_datagram_locked(svsk->sk_sk, skb);
671 return 0;
672}
673
674static int
675svc_udp_sendto(struct svc_rqst *rqstp)
676{
677 int error;
678
679 error = svc_sendto(rqstp, &rqstp->rq_res);
680 if (error == -ECONNREFUSED)
681 /* ICMP error on earlier request. */
682 error = svc_sendto(rqstp, &rqstp->rq_res);
683
684 return error;
685}
686
687static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
688{
689}
690
691static int svc_udp_has_wspace(struct svc_xprt *xprt)
692{
693 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
694 struct svc_serv *serv = xprt->xpt_server;
695 unsigned long required;
696
697 /*
698 * Set the SOCK_NOSPACE flag before checking the available
699 * sock space.
700 */
701 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
702 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
703 if (required*2 > sock_wspace(svsk->sk_sk))
704 return 0;
705 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
706 return 1;
707}
708
709static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
710{
711 BUG();
712 return NULL;
713}
714
715static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
716 struct net *net,
717 struct sockaddr *sa, int salen,
718 int flags)
719{
720 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
721}
722
723static struct svc_xprt_ops svc_udp_ops = {
724 .xpo_create = svc_udp_create,
725 .xpo_recvfrom = svc_udp_recvfrom,
726 .xpo_sendto = svc_udp_sendto,
727 .xpo_release_rqst = svc_release_skb,
728 .xpo_detach = svc_sock_detach,
729 .xpo_free = svc_sock_free,
730 .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
731 .xpo_has_wspace = svc_udp_has_wspace,
732 .xpo_accept = svc_udp_accept,
733 .xpo_secure_port = svc_sock_secure_port,
734};
735
736static struct svc_xprt_class svc_udp_class = {
737 .xcl_name = "udp",
738 .xcl_owner = THIS_MODULE,
739 .xcl_ops = &svc_udp_ops,
740 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
741 .xcl_ident = XPRT_TRANSPORT_UDP,
742};
743
744static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
745{
746 int err, level, optname, one = 1;
747
748 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
749 &svsk->sk_xprt, serv);
750 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
751 svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
752 svsk->sk_sk->sk_write_space = svc_write_space;
753
754 /* initialise setting must have enough space to
755 * receive and respond to one request.
756 * svc_udp_recvfrom will re-adjust if necessary
757 */
758 svc_sock_setbufsize(svsk->sk_sock,
759 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
760 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
761
762 /* data might have come in before data_ready set up */
763 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
764 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
765
766 /* make sure we get destination address info */
767 switch (svsk->sk_sk->sk_family) {
768 case AF_INET:
769 level = SOL_IP;
770 optname = IP_PKTINFO;
771 break;
772 case AF_INET6:
773 level = SOL_IPV6;
774 optname = IPV6_RECVPKTINFO;
775 break;
776 default:
777 BUG();
778 }
779 err = kernel_setsockopt(svsk->sk_sock, level, optname,
780 (char *)&one, sizeof(one));
781 dprintk("svc: kernel_setsockopt returned %d\n", err);
782}
783
784/*
785 * A data_ready event on a listening socket means there's a connection
786 * pending. Do not use state_change as a substitute for it.
787 */
788static void svc_tcp_listen_data_ready(struct sock *sk)
789{
790 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
791 wait_queue_head_t *wq;
792
793 dprintk("svc: socket %p TCP (listen) state change %d\n",
794 sk, sk->sk_state);
795
796 /*
797 * This callback may called twice when a new connection
798 * is established as a child socket inherits everything
799 * from a parent LISTEN socket.
800 * 1) data_ready method of the parent socket will be called
801 * when one of child sockets become ESTABLISHED.
802 * 2) data_ready method of the child socket may be called
803 * when it receives data before the socket is accepted.
804 * In case of 2, we should ignore it silently.
805 */
806 if (sk->sk_state == TCP_LISTEN) {
807 if (svsk) {
808 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
809 svc_xprt_enqueue(&svsk->sk_xprt);
810 } else
811 printk("svc: socket %p: no user data\n", sk);
812 }
813
814 wq = sk_sleep(sk);
815 if (sunrpc_waitqueue_active(wq))
816 wake_up_interruptible_all(wq);
817}
818
819/*
820 * A state change on a connected socket means it's dying or dead.
821 */
822static void svc_tcp_state_change(struct sock *sk)
823{
824 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
825 wait_queue_head_t *wq = sk_sleep(sk);
826
827 dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
828 sk, sk->sk_state, sk->sk_user_data);
829
830 if (!svsk)
831 printk("svc: socket %p: no user data\n", sk);
832 else {
833 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
834 svc_xprt_enqueue(&svsk->sk_xprt);
835 }
836 if (sunrpc_waitqueue_active(wq))
837 wake_up_interruptible_all(wq);
838}
839
840static void svc_tcp_data_ready(struct sock *sk)
841{
842 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
843 wait_queue_head_t *wq = sk_sleep(sk);
844
845 dprintk("svc: socket %p TCP data ready (svsk %p)\n",
846 sk, sk->sk_user_data);
847 if (svsk) {
848 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
849 svc_xprt_enqueue(&svsk->sk_xprt);
850 }
851 if (sunrpc_waitqueue_active(wq))
852 wake_up_interruptible(wq);
853}
854
855/*
856 * Accept a TCP connection
857 */
858static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
859{
860 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
861 struct sockaddr_storage addr;
862 struct sockaddr *sin = (struct sockaddr *) &addr;
863 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
864 struct socket *sock = svsk->sk_sock;
865 struct socket *newsock;
866 struct svc_sock *newsvsk;
867 int err, slen;
868 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
869
870 dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
871 if (!sock)
872 return NULL;
873
874 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
875 err = kernel_accept(sock, &newsock, O_NONBLOCK);
876 if (err < 0) {
877 if (err == -ENOMEM)
878 printk(KERN_WARNING "%s: no more sockets!\n",
879 serv->sv_name);
880 else if (err != -EAGAIN)
881 net_warn_ratelimited("%s: accept failed (err %d)!\n",
882 serv->sv_name, -err);
883 return NULL;
884 }
885 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
886
887 err = kernel_getpeername(newsock, sin, &slen);
888 if (err < 0) {
889 net_warn_ratelimited("%s: peername failed (err %d)!\n",
890 serv->sv_name, -err);
891 goto failed; /* aborted connection or whatever */
892 }
893
894 /* Ideally, we would want to reject connections from unauthorized
895 * hosts here, but when we get encryption, the IP of the host won't
896 * tell us anything. For now just warn about unpriv connections.
897 */
898 if (!svc_port_is_privileged(sin)) {
899 dprintk("%s: connect from unprivileged port: %s\n",
900 serv->sv_name,
901 __svc_print_addr(sin, buf, sizeof(buf)));
902 }
903 dprintk("%s: connect from %s\n", serv->sv_name,
904 __svc_print_addr(sin, buf, sizeof(buf)));
905
906 /* make sure that a write doesn't block forever when
907 * low on memory
908 */
909 newsock->sk->sk_sndtimeo = HZ*30;
910
911 newsvsk = svc_setup_socket(serv, newsock,
912 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
913 if (IS_ERR(newsvsk))
914 goto failed;
915 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
916 err = kernel_getsockname(newsock, sin, &slen);
917 if (unlikely(err < 0)) {
918 dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
919 slen = offsetof(struct sockaddr, sa_data);
920 }
921 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
922
923 if (sock_is_loopback(newsock->sk))
924 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
925 else
926 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
927 if (serv->sv_stats)
928 serv->sv_stats->nettcpconn++;
929
930 return &newsvsk->sk_xprt;
931
932failed:
933 sock_release(newsock);
934 return NULL;
935}
936
937static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
938{
939 unsigned int i, len, npages;
940
941 if (svsk->sk_datalen == 0)
942 return 0;
943 len = svsk->sk_datalen;
944 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
945 for (i = 0; i < npages; i++) {
946 if (rqstp->rq_pages[i] != NULL)
947 put_page(rqstp->rq_pages[i]);
948 BUG_ON(svsk->sk_pages[i] == NULL);
949 rqstp->rq_pages[i] = svsk->sk_pages[i];
950 svsk->sk_pages[i] = NULL;
951 }
952 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
953 return len;
954}
955
956static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
957{
958 unsigned int i, len, npages;
959
960 if (svsk->sk_datalen == 0)
961 return;
962 len = svsk->sk_datalen;
963 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
964 for (i = 0; i < npages; i++) {
965 svsk->sk_pages[i] = rqstp->rq_pages[i];
966 rqstp->rq_pages[i] = NULL;
967 }
968}
969
970static void svc_tcp_clear_pages(struct svc_sock *svsk)
971{
972 unsigned int i, len, npages;
973
974 if (svsk->sk_datalen == 0)
975 goto out;
976 len = svsk->sk_datalen;
977 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
978 for (i = 0; i < npages; i++) {
979 if (svsk->sk_pages[i] == NULL) {
980 WARN_ON_ONCE(1);
981 continue;
982 }
983 put_page(svsk->sk_pages[i]);
984 svsk->sk_pages[i] = NULL;
985 }
986out:
987 svsk->sk_tcplen = 0;
988 svsk->sk_datalen = 0;
989}
990
991/*
992 * Receive fragment record header.
993 * If we haven't gotten the record length yet, get the next four bytes.
994 */
995static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
996{
997 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
998 unsigned int want;
999 int len;
1000
1001 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
1002 struct kvec iov;
1003
1004 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
1005 iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
1006 iov.iov_len = want;
1007 if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
1008 goto error;
1009 svsk->sk_tcplen += len;
1010
1011 if (len < want) {
1012 dprintk("svc: short recvfrom while reading record "
1013 "length (%d of %d)\n", len, want);
1014 return -EAGAIN;
1015 }
1016
1017 dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
1018 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
1019 serv->sv_max_mesg) {
1020 net_notice_ratelimited("RPC: fragment too large: %d\n",
1021 svc_sock_reclen(svsk));
1022 goto err_delete;
1023 }
1024 }
1025
1026 return svc_sock_reclen(svsk);
1027error:
1028 dprintk("RPC: TCP recv_record got %d\n", len);
1029 return len;
1030err_delete:
1031 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1032 return -EAGAIN;
1033}
1034
1035static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
1036{
1037 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
1038 struct rpc_rqst *req = NULL;
1039 struct kvec *src, *dst;
1040 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1041 __be32 xid;
1042 __be32 calldir;
1043
1044 xid = *p++;
1045 calldir = *p;
1046
1047 if (!bc_xprt)
1048 return -EAGAIN;
1049 spin_lock_bh(&bc_xprt->transport_lock);
1050 req = xprt_lookup_rqst(bc_xprt, xid);
1051 if (!req)
1052 goto unlock_notfound;
1053
1054 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
1055 /*
1056 * XXX!: cheating for now! Only copying HEAD.
1057 * But we know this is good enough for now (in fact, for any
1058 * callback reply in the forseeable future).
1059 */
1060 dst = &req->rq_private_buf.head[0];
1061 src = &rqstp->rq_arg.head[0];
1062 if (dst->iov_len < src->iov_len)
1063 goto unlock_eagain; /* whatever; just giving up. */
1064 memcpy(dst->iov_base, src->iov_base, src->iov_len);
1065 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
1066 rqstp->rq_arg.len = 0;
1067 spin_unlock_bh(&bc_xprt->transport_lock);
1068 return 0;
1069unlock_notfound:
1070 printk(KERN_NOTICE
1071 "%s: Got unrecognized reply: "
1072 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
1073 __func__, ntohl(calldir),
1074 bc_xprt, ntohl(xid));
1075unlock_eagain:
1076 spin_unlock_bh(&bc_xprt->transport_lock);
1077 return -EAGAIN;
1078}
1079
1080static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
1081{
1082 int i = 0;
1083 int t = 0;
1084
1085 while (t < len) {
1086 vec[i].iov_base = page_address(pages[i]);
1087 vec[i].iov_len = PAGE_SIZE;
1088 i++;
1089 t += PAGE_SIZE;
1090 }
1091 return i;
1092}
1093
1094static void svc_tcp_fragment_received(struct svc_sock *svsk)
1095{
1096 /* If we have more data, signal svc_xprt_enqueue() to try again */
1097 dprintk("svc: TCP %s record (%d bytes)\n",
1098 svc_sock_final_rec(svsk) ? "final" : "nonfinal",
1099 svc_sock_reclen(svsk));
1100 svsk->sk_tcplen = 0;
1101 svsk->sk_reclen = 0;
1102}
1103
1104/*
1105 * Receive data from a TCP socket.
1106 */
1107static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
1108{
1109 struct svc_sock *svsk =
1110 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
1111 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
1112 int len;
1113 struct kvec *vec;
1114 unsigned int want, base;
1115 __be32 *p;
1116 __be32 calldir;
1117 int pnum;
1118
1119 dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
1120 svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
1121 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
1122 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
1123
1124 len = svc_tcp_recv_record(svsk, rqstp);
1125 if (len < 0)
1126 goto error;
1127
1128 base = svc_tcp_restore_pages(svsk, rqstp);
1129 want = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
1130
1131 vec = rqstp->rq_vec;
1132
1133 pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
1134 svsk->sk_datalen + want);
1135
1136 rqstp->rq_respages = &rqstp->rq_pages[pnum];
1137 rqstp->rq_next_page = rqstp->rq_respages + 1;
1138
1139 /* Now receive data */
1140 len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
1141 if (len >= 0) {
1142 svsk->sk_tcplen += len;
1143 svsk->sk_datalen += len;
1144 }
1145 if (len != want || !svc_sock_final_rec(svsk)) {
1146 svc_tcp_save_pages(svsk, rqstp);
1147 if (len < 0 && len != -EAGAIN)
1148 goto err_delete;
1149 if (len == want)
1150 svc_tcp_fragment_received(svsk);
1151 else
1152 dprintk("svc: incomplete TCP record (%d of %d)\n",
1153 (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
1154 svc_sock_reclen(svsk));
1155 goto err_noclose;
1156 }
1157
1158 if (svsk->sk_datalen < 8) {
1159 svsk->sk_datalen = 0;
1160 goto err_delete; /* client is nuts. */
1161 }
1162
1163 rqstp->rq_arg.len = svsk->sk_datalen;
1164 rqstp->rq_arg.page_base = 0;
1165 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1166 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1167 rqstp->rq_arg.page_len = 0;
1168 } else
1169 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1170
1171 rqstp->rq_xprt_ctxt = NULL;
1172 rqstp->rq_prot = IPPROTO_TCP;
1173 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
1174 set_bit(RQ_LOCAL, &rqstp->rq_flags);
1175 else
1176 clear_bit(RQ_LOCAL, &rqstp->rq_flags);
1177
1178 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1179 calldir = p[1];
1180 if (calldir)
1181 len = receive_cb_reply(svsk, rqstp);
1182
1183 /* Reset TCP read info */
1184 svsk->sk_datalen = 0;
1185 svc_tcp_fragment_received(svsk);
1186
1187 if (len < 0)
1188 goto error;
1189
1190 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1191 if (serv->sv_stats)
1192 serv->sv_stats->nettcpcnt++;
1193
1194 return rqstp->rq_arg.len;
1195
1196error:
1197 if (len != -EAGAIN)
1198 goto err_delete;
1199 dprintk("RPC: TCP recvfrom got EAGAIN\n");
1200 return 0;
1201err_delete:
1202 printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
1203 svsk->sk_xprt.xpt_server->sv_name, -len);
1204 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1205err_noclose:
1206 return 0; /* record not complete */
1207}
1208
1209/*
1210 * Send out data on TCP socket.
1211 */
1212static int svc_tcp_sendto(struct svc_rqst *rqstp)
1213{
1214 struct xdr_buf *xbufp = &rqstp->rq_res;
1215 int sent;
1216 __be32 reclen;
1217
1218 /* Set up the first element of the reply kvec.
1219 * Any other kvecs that may be in use have been taken
1220 * care of by the server implementation itself.
1221 */
1222 reclen = htonl(0x80000000|((xbufp->len ) - 4));
1223 memcpy(xbufp->head[0].iov_base, &reclen, 4);
1224
1225 sent = svc_sendto(rqstp, &rqstp->rq_res);
1226 if (sent != xbufp->len) {
1227 printk(KERN_NOTICE
1228 "rpc-srv/tcp: %s: %s %d when sending %d bytes "
1229 "- shutting down socket\n",
1230 rqstp->rq_xprt->xpt_server->sv_name,
1231 (sent<0)?"got error":"sent only",
1232 sent, xbufp->len);
1233 set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
1234 svc_xprt_enqueue(rqstp->rq_xprt);
1235 sent = -EAGAIN;
1236 }
1237 return sent;
1238}
1239
1240/*
1241 * Setup response header. TCP has a 4B record length field.
1242 */
1243static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
1244{
1245 struct kvec *resv = &rqstp->rq_res.head[0];
1246
1247 /* tcp needs a space for the record length... */
1248 svc_putnl(resv, 0);
1249}
1250
1251static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1252 struct net *net,
1253 struct sockaddr *sa, int salen,
1254 int flags)
1255{
1256 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1257}
1258
1259#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1260static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
1261 struct net *, struct sockaddr *,
1262 int, int);
1263static void svc_bc_sock_free(struct svc_xprt *xprt);
1264
1265static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
1266 struct net *net,
1267 struct sockaddr *sa, int salen,
1268 int flags)
1269{
1270 return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1271}
1272
1273static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
1274{
1275}
1276
1277static struct svc_xprt_ops svc_tcp_bc_ops = {
1278 .xpo_create = svc_bc_tcp_create,
1279 .xpo_detach = svc_bc_tcp_sock_detach,
1280 .xpo_free = svc_bc_sock_free,
1281 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1282 .xpo_secure_port = svc_sock_secure_port,
1283};
1284
1285static struct svc_xprt_class svc_tcp_bc_class = {
1286 .xcl_name = "tcp-bc",
1287 .xcl_owner = THIS_MODULE,
1288 .xcl_ops = &svc_tcp_bc_ops,
1289 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1290};
1291
1292static void svc_init_bc_xprt_sock(void)
1293{
1294 svc_reg_xprt_class(&svc_tcp_bc_class);
1295}
1296
1297static void svc_cleanup_bc_xprt_sock(void)
1298{
1299 svc_unreg_xprt_class(&svc_tcp_bc_class);
1300}
1301#else /* CONFIG_SUNRPC_BACKCHANNEL */
1302static void svc_init_bc_xprt_sock(void)
1303{
1304}
1305
1306static void svc_cleanup_bc_xprt_sock(void)
1307{
1308}
1309#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1310
1311static struct svc_xprt_ops svc_tcp_ops = {
1312 .xpo_create = svc_tcp_create,
1313 .xpo_recvfrom = svc_tcp_recvfrom,
1314 .xpo_sendto = svc_tcp_sendto,
1315 .xpo_release_rqst = svc_release_skb,
1316 .xpo_detach = svc_tcp_sock_detach,
1317 .xpo_free = svc_sock_free,
1318 .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
1319 .xpo_has_wspace = svc_tcp_has_wspace,
1320 .xpo_accept = svc_tcp_accept,
1321 .xpo_secure_port = svc_sock_secure_port,
1322 .xpo_adjust_wspace = svc_tcp_adjust_wspace,
1323};
1324
1325static struct svc_xprt_class svc_tcp_class = {
1326 .xcl_name = "tcp",
1327 .xcl_owner = THIS_MODULE,
1328 .xcl_ops = &svc_tcp_ops,
1329 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1330 .xcl_ident = XPRT_TRANSPORT_TCP,
1331};
1332
1333void svc_init_xprt_sock(void)
1334{
1335 svc_reg_xprt_class(&svc_tcp_class);
1336 svc_reg_xprt_class(&svc_udp_class);
1337 svc_init_bc_xprt_sock();
1338}
1339
1340void svc_cleanup_xprt_sock(void)
1341{
1342 svc_unreg_xprt_class(&svc_tcp_class);
1343 svc_unreg_xprt_class(&svc_udp_class);
1344 svc_cleanup_bc_xprt_sock();
1345}
1346
1347static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1348{
1349 struct sock *sk = svsk->sk_sk;
1350
1351 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1352 &svsk->sk_xprt, serv);
1353 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1354 if (sk->sk_state == TCP_LISTEN) {
1355 dprintk("setting up TCP socket for listening\n");
1356 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1357 sk->sk_data_ready = svc_tcp_listen_data_ready;
1358 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1359 } else {
1360 dprintk("setting up TCP socket for reading\n");
1361 sk->sk_state_change = svc_tcp_state_change;
1362 sk->sk_data_ready = svc_tcp_data_ready;
1363 sk->sk_write_space = svc_tcp_write_space;
1364
1365 svsk->sk_reclen = 0;
1366 svsk->sk_tcplen = 0;
1367 svsk->sk_datalen = 0;
1368 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1369
1370 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1371
1372 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1373 if (sk->sk_state != TCP_ESTABLISHED)
1374 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
1375 }
1376}
1377
1378void svc_sock_update_bufs(struct svc_serv *serv)
1379{
1380 /*
1381 * The number of server threads has changed. Update
1382 * rcvbuf and sndbuf accordingly on all sockets
1383 */
1384 struct svc_sock *svsk;
1385
1386 spin_lock_bh(&serv->sv_lock);
1387 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1388 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1389 spin_unlock_bh(&serv->sv_lock);
1390}
1391EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1392
1393/*
1394 * Initialize socket for RPC use and create svc_sock struct
1395 */
1396static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1397 struct socket *sock,
1398 int flags)
1399{
1400 struct svc_sock *svsk;
1401 struct sock *inet;
1402 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1403 int err = 0;
1404
1405 dprintk("svc: svc_setup_socket %p\n", sock);
1406 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1407 if (!svsk)
1408 return ERR_PTR(-ENOMEM);
1409
1410 inet = sock->sk;
1411
1412 /* Register socket with portmapper */
1413 if (pmap_register)
1414 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1415 inet->sk_protocol,
1416 ntohs(inet_sk(inet)->inet_sport));
1417
1418 if (err < 0) {
1419 kfree(svsk);
1420 return ERR_PTR(err);
1421 }
1422
1423 inet->sk_user_data = svsk;
1424 svsk->sk_sock = sock;
1425 svsk->sk_sk = inet;
1426 svsk->sk_ostate = inet->sk_state_change;
1427 svsk->sk_odata = inet->sk_data_ready;
1428 svsk->sk_owspace = inet->sk_write_space;
1429
1430 /* Initialize the socket */
1431 if (sock->type == SOCK_DGRAM)
1432 svc_udp_init(svsk, serv);
1433 else {
1434 /* initialise setting must have enough space to
1435 * receive and respond to one request.
1436 */
1437 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1438 4 * serv->sv_max_mesg);
1439 svc_tcp_init(svsk, serv);
1440 }
1441
1442 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1443 svsk, svsk->sk_sk);
1444
1445 return svsk;
1446}
1447
1448bool svc_alien_sock(struct net *net, int fd)
1449{
1450 int err;
1451 struct socket *sock = sockfd_lookup(fd, &err);
1452 bool ret = false;
1453
1454 if (!sock)
1455 goto out;
1456 if (sock_net(sock->sk) != net)
1457 ret = true;
1458 sockfd_put(sock);
1459out:
1460 return ret;
1461}
1462EXPORT_SYMBOL_GPL(svc_alien_sock);
1463
1464/**
1465 * svc_addsock - add a listener socket to an RPC service
1466 * @serv: pointer to RPC service to which to add a new listener
1467 * @fd: file descriptor of the new listener
1468 * @name_return: pointer to buffer to fill in with name of listener
1469 * @len: size of the buffer
1470 *
1471 * Fills in socket name and returns positive length of name if successful.
1472 * Name is terminated with '\n'. On error, returns a negative errno
1473 * value.
1474 */
1475int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1476 const size_t len)
1477{
1478 int err = 0;
1479 struct socket *so = sockfd_lookup(fd, &err);
1480 struct svc_sock *svsk = NULL;
1481 struct sockaddr_storage addr;
1482 struct sockaddr *sin = (struct sockaddr *)&addr;
1483 int salen;
1484
1485 if (!so)
1486 return err;
1487 err = -EAFNOSUPPORT;
1488 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1489 goto out;
1490 err = -EPROTONOSUPPORT;
1491 if (so->sk->sk_protocol != IPPROTO_TCP &&
1492 so->sk->sk_protocol != IPPROTO_UDP)
1493 goto out;
1494 err = -EISCONN;
1495 if (so->state > SS_UNCONNECTED)
1496 goto out;
1497 err = -ENOENT;
1498 if (!try_module_get(THIS_MODULE))
1499 goto out;
1500 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1501 if (IS_ERR(svsk)) {
1502 module_put(THIS_MODULE);
1503 err = PTR_ERR(svsk);
1504 goto out;
1505 }
1506 if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
1507 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1508 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1509 return svc_one_sock_name(svsk, name_return, len);
1510out:
1511 sockfd_put(so);
1512 return err;
1513}
1514EXPORT_SYMBOL_GPL(svc_addsock);
1515
1516/*
1517 * Create socket for RPC service.
1518 */
1519static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1520 int protocol,
1521 struct net *net,
1522 struct sockaddr *sin, int len,
1523 int flags)
1524{
1525 struct svc_sock *svsk;
1526 struct socket *sock;
1527 int error;
1528 int type;
1529 struct sockaddr_storage addr;
1530 struct sockaddr *newsin = (struct sockaddr *)&addr;
1531 int newlen;
1532 int family;
1533 int val;
1534 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
1535
1536 dprintk("svc: svc_create_socket(%s, %d, %s)\n",
1537 serv->sv_program->pg_name, protocol,
1538 __svc_print_addr(sin, buf, sizeof(buf)));
1539
1540 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1541 printk(KERN_WARNING "svc: only UDP and TCP "
1542 "sockets supported\n");
1543 return ERR_PTR(-EINVAL);
1544 }
1545
1546 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1547 switch (sin->sa_family) {
1548 case AF_INET6:
1549 family = PF_INET6;
1550 break;
1551 case AF_INET:
1552 family = PF_INET;
1553 break;
1554 default:
1555 return ERR_PTR(-EINVAL);
1556 }
1557
1558 error = __sock_create(net, family, type, protocol, &sock, 1);
1559 if (error < 0)
1560 return ERR_PTR(error);
1561
1562 svc_reclassify_socket(sock);
1563
1564 /*
1565 * If this is an PF_INET6 listener, we want to avoid
1566 * getting requests from IPv4 remotes. Those should
1567 * be shunted to a PF_INET listener via rpcbind.
1568 */
1569 val = 1;
1570 if (family == PF_INET6)
1571 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
1572 (char *)&val, sizeof(val));
1573
1574 if (type == SOCK_STREAM)
1575 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1576 error = kernel_bind(sock, sin, len);
1577 if (error < 0)
1578 goto bummer;
1579
1580 newlen = len;
1581 error = kernel_getsockname(sock, newsin, &newlen);
1582 if (error < 0)
1583 goto bummer;
1584
1585 if (protocol == IPPROTO_TCP) {
1586 if ((error = kernel_listen(sock, 64)) < 0)
1587 goto bummer;
1588 }
1589
1590 svsk = svc_setup_socket(serv, sock, flags);
1591 if (IS_ERR(svsk)) {
1592 error = PTR_ERR(svsk);
1593 goto bummer;
1594 }
1595 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1596 return (struct svc_xprt *)svsk;
1597bummer:
1598 dprintk("svc: svc_create_socket error = %d\n", -error);
1599 sock_release(sock);
1600 return ERR_PTR(error);
1601}
1602
1603/*
1604 * Detach the svc_sock from the socket so that no
1605 * more callbacks occur.
1606 */
1607static void svc_sock_detach(struct svc_xprt *xprt)
1608{
1609 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1610 struct sock *sk = svsk->sk_sk;
1611 wait_queue_head_t *wq;
1612
1613 dprintk("svc: svc_sock_detach(%p)\n", svsk);
1614
1615 /* put back the old socket callbacks */
1616 sk->sk_state_change = svsk->sk_ostate;
1617 sk->sk_data_ready = svsk->sk_odata;
1618 sk->sk_write_space = svsk->sk_owspace;
1619
1620 wq = sk_sleep(sk);
1621 if (sunrpc_waitqueue_active(wq))
1622 wake_up_interruptible(wq);
1623}
1624
1625/*
1626 * Disconnect the socket, and reset the callbacks
1627 */
1628static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1629{
1630 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1631
1632 dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
1633
1634 svc_sock_detach(xprt);
1635
1636 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1637 svc_tcp_clear_pages(svsk);
1638 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1639 }
1640}
1641
1642/*
1643 * Free the svc_sock's socket resources and the svc_sock itself.
1644 */
1645static void svc_sock_free(struct svc_xprt *xprt)
1646{
1647 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1648 dprintk("svc: svc_sock_free(%p)\n", svsk);
1649
1650 if (svsk->sk_sock->file)
1651 sockfd_put(svsk->sk_sock);
1652 else
1653 sock_release(svsk->sk_sock);
1654 kfree(svsk);
1655}
1656
1657#if defined(CONFIG_SUNRPC_BACKCHANNEL)
1658/*
1659 * Create a back channel svc_xprt which shares the fore channel socket.
1660 */
1661static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
1662 int protocol,
1663 struct net *net,
1664 struct sockaddr *sin, int len,
1665 int flags)
1666{
1667 struct svc_sock *svsk;
1668 struct svc_xprt *xprt;
1669
1670 if (protocol != IPPROTO_TCP) {
1671 printk(KERN_WARNING "svc: only TCP sockets"
1672 " supported on shared back channel\n");
1673 return ERR_PTR(-EINVAL);
1674 }
1675
1676 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1677 if (!svsk)
1678 return ERR_PTR(-ENOMEM);
1679
1680 xprt = &svsk->sk_xprt;
1681 svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
1682
1683 serv->sv_bc_xprt = xprt;
1684
1685 return xprt;
1686}
1687
1688/*
1689 * Free a back channel svc_sock.
1690 */
1691static void svc_bc_sock_free(struct svc_xprt *xprt)
1692{
1693 if (xprt)
1694 kfree(container_of(xprt, struct svc_sock, sk_xprt));
1695}
1696#endif /* CONFIG_SUNRPC_BACKCHANNEL */
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/net/sunrpc/svcsock.c
4 *
5 * These are the RPC server socket internals.
6 *
7 * The server scheduling algorithm does not always distribute the load
8 * evenly when servicing a single client. May need to modify the
9 * svc_xprt_enqueue procedure...
10 *
11 * TCP support is largely untested and may be a little slow. The problem
12 * is that we currently do two separate recvfrom's, one for the 4-byte
13 * record length, and the second for the actual record. This could possibly
14 * be improved by always reading a minimum size of around 100 bytes and
15 * tucking any superfluous bytes away in a temporary store. Still, that
16 * leaves write requests out in the rain. An alternative may be to peek at
17 * the first skb in the queue, and if it matches the next TCP sequence
18 * number, to extract the record marker. Yuck.
19 *
20 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
21 */
22
23#include <linux/kernel.h>
24#include <linux/sched.h>
25#include <linux/module.h>
26#include <linux/errno.h>
27#include <linux/fcntl.h>
28#include <linux/net.h>
29#include <linux/in.h>
30#include <linux/inet.h>
31#include <linux/udp.h>
32#include <linux/tcp.h>
33#include <linux/unistd.h>
34#include <linux/slab.h>
35#include <linux/netdevice.h>
36#include <linux/skbuff.h>
37#include <linux/file.h>
38#include <linux/freezer.h>
39#include <net/sock.h>
40#include <net/checksum.h>
41#include <net/ip.h>
42#include <net/ipv6.h>
43#include <net/udp.h>
44#include <net/tcp.h>
45#include <net/tcp_states.h>
46#include <linux/uaccess.h>
47#include <linux/highmem.h>
48#include <asm/ioctls.h>
49
50#include <linux/sunrpc/types.h>
51#include <linux/sunrpc/clnt.h>
52#include <linux/sunrpc/xdr.h>
53#include <linux/sunrpc/msg_prot.h>
54#include <linux/sunrpc/svcsock.h>
55#include <linux/sunrpc/stats.h>
56#include <linux/sunrpc/xprt.h>
57
58#include <trace/events/sunrpc.h>
59
60#include "socklib.h"
61#include "sunrpc.h"
62
63#define RPCDBG_FACILITY RPCDBG_SVCXPRT
64
65
66static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
67 int flags);
68static int svc_udp_recvfrom(struct svc_rqst *);
69static int svc_udp_sendto(struct svc_rqst *);
70static void svc_sock_detach(struct svc_xprt *);
71static void svc_tcp_sock_detach(struct svc_xprt *);
72static void svc_sock_free(struct svc_xprt *);
73
74static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
75 struct net *, struct sockaddr *,
76 int, int);
77#ifdef CONFIG_DEBUG_LOCK_ALLOC
78static struct lock_class_key svc_key[2];
79static struct lock_class_key svc_slock_key[2];
80
81static void svc_reclassify_socket(struct socket *sock)
82{
83 struct sock *sk = sock->sk;
84
85 if (WARN_ON_ONCE(!sock_allow_reclassification(sk)))
86 return;
87
88 switch (sk->sk_family) {
89 case AF_INET:
90 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
91 &svc_slock_key[0],
92 "sk_xprt.xpt_lock-AF_INET-NFSD",
93 &svc_key[0]);
94 break;
95
96 case AF_INET6:
97 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
98 &svc_slock_key[1],
99 "sk_xprt.xpt_lock-AF_INET6-NFSD",
100 &svc_key[1]);
101 break;
102
103 default:
104 BUG();
105 }
106}
107#else
108static void svc_reclassify_socket(struct socket *sock)
109{
110}
111#endif
112
113/**
114 * svc_tcp_release_rqst - Release transport-related resources
115 * @rqstp: request structure with resources to be released
116 *
117 */
118static void svc_tcp_release_rqst(struct svc_rqst *rqstp)
119{
120}
121
122/**
123 * svc_udp_release_rqst - Release transport-related resources
124 * @rqstp: request structure with resources to be released
125 *
126 */
127static void svc_udp_release_rqst(struct svc_rqst *rqstp)
128{
129 struct sk_buff *skb = rqstp->rq_xprt_ctxt;
130
131 if (skb) {
132 rqstp->rq_xprt_ctxt = NULL;
133 consume_skb(skb);
134 }
135}
136
137union svc_pktinfo_u {
138 struct in_pktinfo pkti;
139 struct in6_pktinfo pkti6;
140};
141#define SVC_PKTINFO_SPACE \
142 CMSG_SPACE(sizeof(union svc_pktinfo_u))
143
144static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
145{
146 struct svc_sock *svsk =
147 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
148 switch (svsk->sk_sk->sk_family) {
149 case AF_INET: {
150 struct in_pktinfo *pki = CMSG_DATA(cmh);
151
152 cmh->cmsg_level = SOL_IP;
153 cmh->cmsg_type = IP_PKTINFO;
154 pki->ipi_ifindex = 0;
155 pki->ipi_spec_dst.s_addr =
156 svc_daddr_in(rqstp)->sin_addr.s_addr;
157 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
158 }
159 break;
160
161 case AF_INET6: {
162 struct in6_pktinfo *pki = CMSG_DATA(cmh);
163 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
164
165 cmh->cmsg_level = SOL_IPV6;
166 cmh->cmsg_type = IPV6_PKTINFO;
167 pki->ipi6_ifindex = daddr->sin6_scope_id;
168 pki->ipi6_addr = daddr->sin6_addr;
169 cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
170 }
171 break;
172 }
173}
174
175static int svc_sock_result_payload(struct svc_rqst *rqstp, unsigned int offset,
176 unsigned int length)
177{
178 return 0;
179}
180
181/*
182 * Report socket names for nfsdfs
183 */
184static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
185{
186 const struct sock *sk = svsk->sk_sk;
187 const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
188 "udp" : "tcp";
189 int len;
190
191 switch (sk->sk_family) {
192 case PF_INET:
193 len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
194 proto_name,
195 &inet_sk(sk)->inet_rcv_saddr,
196 inet_sk(sk)->inet_num);
197 break;
198#if IS_ENABLED(CONFIG_IPV6)
199 case PF_INET6:
200 len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
201 proto_name,
202 &sk->sk_v6_rcv_saddr,
203 inet_sk(sk)->inet_num);
204 break;
205#endif
206 default:
207 len = snprintf(buf, remaining, "*unknown-%d*\n",
208 sk->sk_family);
209 }
210
211 if (len >= remaining) {
212 *buf = '\0';
213 return -ENAMETOOLONG;
214 }
215 return len;
216}
217
218#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
219static void svc_flush_bvec(const struct bio_vec *bvec, size_t size, size_t seek)
220{
221 struct bvec_iter bi = {
222 .bi_size = size + seek,
223 };
224 struct bio_vec bv;
225
226 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
227 for_each_bvec(bv, bvec, bi, bi)
228 flush_dcache_page(bv.bv_page);
229}
230#else
231static inline void svc_flush_bvec(const struct bio_vec *bvec, size_t size,
232 size_t seek)
233{
234}
235#endif
236
237/*
238 * Read from @rqstp's transport socket. The incoming message fills whole
239 * pages in @rqstp's rq_pages array until the last page of the message
240 * has been received into a partial page.
241 */
242static ssize_t svc_tcp_read_msg(struct svc_rqst *rqstp, size_t buflen,
243 size_t seek)
244{
245 struct svc_sock *svsk =
246 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
247 struct bio_vec *bvec = rqstp->rq_bvec;
248 struct msghdr msg = { NULL };
249 unsigned int i;
250 ssize_t len;
251 size_t t;
252
253 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
254
255 for (i = 0, t = 0; t < buflen; i++, t += PAGE_SIZE) {
256 bvec[i].bv_page = rqstp->rq_pages[i];
257 bvec[i].bv_len = PAGE_SIZE;
258 bvec[i].bv_offset = 0;
259 }
260 rqstp->rq_respages = &rqstp->rq_pages[i];
261 rqstp->rq_next_page = rqstp->rq_respages + 1;
262
263 iov_iter_bvec(&msg.msg_iter, ITER_DEST, bvec, i, buflen);
264 if (seek) {
265 iov_iter_advance(&msg.msg_iter, seek);
266 buflen -= seek;
267 }
268 len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);
269 if (len > 0)
270 svc_flush_bvec(bvec, len, seek);
271
272 /* If we read a full record, then assume there may be more
273 * data to read (stream based sockets only!)
274 */
275 if (len == buflen)
276 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
277
278 return len;
279}
280
281/*
282 * Set socket snd and rcv buffer lengths
283 */
284static void svc_sock_setbufsize(struct svc_sock *svsk, unsigned int nreqs)
285{
286 unsigned int max_mesg = svsk->sk_xprt.xpt_server->sv_max_mesg;
287 struct socket *sock = svsk->sk_sock;
288
289 nreqs = min(nreqs, INT_MAX / 2 / max_mesg);
290
291 lock_sock(sock->sk);
292 sock->sk->sk_sndbuf = nreqs * max_mesg * 2;
293 sock->sk->sk_rcvbuf = nreqs * max_mesg * 2;
294 sock->sk->sk_write_space(sock->sk);
295 release_sock(sock->sk);
296}
297
298static void svc_sock_secure_port(struct svc_rqst *rqstp)
299{
300 if (svc_port_is_privileged(svc_addr(rqstp)))
301 set_bit(RQ_SECURE, &rqstp->rq_flags);
302 else
303 clear_bit(RQ_SECURE, &rqstp->rq_flags);
304}
305
306/*
307 * INET callback when data has been received on the socket.
308 */
309static void svc_data_ready(struct sock *sk)
310{
311 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
312
313 if (svsk) {
314 /* Refer to svc_setup_socket() for details. */
315 rmb();
316 svsk->sk_odata(sk);
317 trace_svcsock_data_ready(&svsk->sk_xprt, 0);
318 if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
319 svc_xprt_enqueue(&svsk->sk_xprt);
320 }
321}
322
323/*
324 * INET callback when space is newly available on the socket.
325 */
326static void svc_write_space(struct sock *sk)
327{
328 struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
329
330 if (svsk) {
331 /* Refer to svc_setup_socket() for details. */
332 rmb();
333 trace_svcsock_write_space(&svsk->sk_xprt, 0);
334 svsk->sk_owspace(sk);
335 svc_xprt_enqueue(&svsk->sk_xprt);
336 }
337}
338
339static int svc_tcp_has_wspace(struct svc_xprt *xprt)
340{
341 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
342
343 if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
344 return 1;
345 return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
346}
347
348static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
349{
350 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
351
352 sock_no_linger(svsk->sk_sock->sk);
353}
354
355/*
356 * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
357 */
358static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
359 struct cmsghdr *cmh)
360{
361 struct in_pktinfo *pki = CMSG_DATA(cmh);
362 struct sockaddr_in *daddr = svc_daddr_in(rqstp);
363
364 if (cmh->cmsg_type != IP_PKTINFO)
365 return 0;
366
367 daddr->sin_family = AF_INET;
368 daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
369 return 1;
370}
371
372/*
373 * See net/ipv6/datagram.c : ip6_datagram_recv_ctl
374 */
375static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
376 struct cmsghdr *cmh)
377{
378 struct in6_pktinfo *pki = CMSG_DATA(cmh);
379 struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
380
381 if (cmh->cmsg_type != IPV6_PKTINFO)
382 return 0;
383
384 daddr->sin6_family = AF_INET6;
385 daddr->sin6_addr = pki->ipi6_addr;
386 daddr->sin6_scope_id = pki->ipi6_ifindex;
387 return 1;
388}
389
390/*
391 * Copy the UDP datagram's destination address to the rqstp structure.
392 * The 'destination' address in this case is the address to which the
393 * peer sent the datagram, i.e. our local address. For multihomed
394 * hosts, this can change from msg to msg. Note that only the IP
395 * address changes, the port number should remain the same.
396 */
397static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
398 struct cmsghdr *cmh)
399{
400 switch (cmh->cmsg_level) {
401 case SOL_IP:
402 return svc_udp_get_dest_address4(rqstp, cmh);
403 case SOL_IPV6:
404 return svc_udp_get_dest_address6(rqstp, cmh);
405 }
406
407 return 0;
408}
409
410/**
411 * svc_udp_recvfrom - Receive a datagram from a UDP socket.
412 * @rqstp: request structure into which to receive an RPC Call
413 *
414 * Called in a loop when XPT_DATA has been set.
415 *
416 * Returns:
417 * On success, the number of bytes in a received RPC Call, or
418 * %0 if a complete RPC Call message was not ready to return
419 */
420static int svc_udp_recvfrom(struct svc_rqst *rqstp)
421{
422 struct svc_sock *svsk =
423 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
424 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
425 struct sk_buff *skb;
426 union {
427 struct cmsghdr hdr;
428 long all[SVC_PKTINFO_SPACE / sizeof(long)];
429 } buffer;
430 struct cmsghdr *cmh = &buffer.hdr;
431 struct msghdr msg = {
432 .msg_name = svc_addr(rqstp),
433 .msg_control = cmh,
434 .msg_controllen = sizeof(buffer),
435 .msg_flags = MSG_DONTWAIT,
436 };
437 size_t len;
438 int err;
439
440 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
441 /* udp sockets need large rcvbuf as all pending
442 * requests are still in that buffer. sndbuf must
443 * also be large enough that there is enough space
444 * for one reply per thread. We count all threads
445 * rather than threads in a particular pool, which
446 * provides an upper bound on the number of threads
447 * which will access the socket.
448 */
449 svc_sock_setbufsize(svsk, serv->sv_nrthreads + 3);
450
451 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
452 err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
453 0, 0, MSG_PEEK | MSG_DONTWAIT);
454 if (err < 0)
455 goto out_recv_err;
456 skb = skb_recv_udp(svsk->sk_sk, MSG_DONTWAIT, &err);
457 if (!skb)
458 goto out_recv_err;
459
460 len = svc_addr_len(svc_addr(rqstp));
461 rqstp->rq_addrlen = len;
462 if (skb->tstamp == 0) {
463 skb->tstamp = ktime_get_real();
464 /* Don't enable netstamp, sunrpc doesn't
465 need that much accuracy */
466 }
467 sock_write_timestamp(svsk->sk_sk, skb->tstamp);
468 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
469
470 len = skb->len;
471 rqstp->rq_arg.len = len;
472 trace_svcsock_udp_recv(&svsk->sk_xprt, len);
473
474 rqstp->rq_prot = IPPROTO_UDP;
475
476 if (!svc_udp_get_dest_address(rqstp, cmh))
477 goto out_cmsg_err;
478 rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
479
480 if (skb_is_nonlinear(skb)) {
481 /* we have to copy */
482 local_bh_disable();
483 if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb))
484 goto out_bh_enable;
485 local_bh_enable();
486 consume_skb(skb);
487 } else {
488 /* we can use it in-place */
489 rqstp->rq_arg.head[0].iov_base = skb->data;
490 rqstp->rq_arg.head[0].iov_len = len;
491 if (skb_checksum_complete(skb))
492 goto out_free;
493 rqstp->rq_xprt_ctxt = skb;
494 }
495
496 rqstp->rq_arg.page_base = 0;
497 if (len <= rqstp->rq_arg.head[0].iov_len) {
498 rqstp->rq_arg.head[0].iov_len = len;
499 rqstp->rq_arg.page_len = 0;
500 rqstp->rq_respages = rqstp->rq_pages+1;
501 } else {
502 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
503 rqstp->rq_respages = rqstp->rq_pages + 1 +
504 DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
505 }
506 rqstp->rq_next_page = rqstp->rq_respages+1;
507
508 if (serv->sv_stats)
509 serv->sv_stats->netudpcnt++;
510
511 svc_xprt_received(rqstp->rq_xprt);
512 return len;
513
514out_recv_err:
515 if (err != -EAGAIN) {
516 /* possibly an icmp error */
517 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
518 }
519 trace_svcsock_udp_recv_err(&svsk->sk_xprt, err);
520 goto out_clear_busy;
521out_cmsg_err:
522 net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
523 cmh->cmsg_level, cmh->cmsg_type);
524 goto out_free;
525out_bh_enable:
526 local_bh_enable();
527out_free:
528 kfree_skb(skb);
529out_clear_busy:
530 svc_xprt_received(rqstp->rq_xprt);
531 return 0;
532}
533
534/**
535 * svc_udp_sendto - Send out a reply on a UDP socket
536 * @rqstp: completed svc_rqst
537 *
538 * xpt_mutex ensures @rqstp's whole message is written to the socket
539 * without interruption.
540 *
541 * Returns the number of bytes sent, or a negative errno.
542 */
543static int svc_udp_sendto(struct svc_rqst *rqstp)
544{
545 struct svc_xprt *xprt = rqstp->rq_xprt;
546 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
547 struct xdr_buf *xdr = &rqstp->rq_res;
548 union {
549 struct cmsghdr hdr;
550 long all[SVC_PKTINFO_SPACE / sizeof(long)];
551 } buffer;
552 struct cmsghdr *cmh = &buffer.hdr;
553 struct msghdr msg = {
554 .msg_name = &rqstp->rq_addr,
555 .msg_namelen = rqstp->rq_addrlen,
556 .msg_control = cmh,
557 .msg_controllen = sizeof(buffer),
558 };
559 unsigned int sent;
560 int err;
561
562 svc_udp_release_rqst(rqstp);
563
564 svc_set_cmsg_data(rqstp, cmh);
565
566 mutex_lock(&xprt->xpt_mutex);
567
568 if (svc_xprt_is_dead(xprt))
569 goto out_notconn;
570
571 err = xdr_alloc_bvec(xdr, GFP_KERNEL);
572 if (err < 0)
573 goto out_unlock;
574
575 err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
576 if (err == -ECONNREFUSED) {
577 /* ICMP error on earlier request. */
578 err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
579 }
580 xdr_free_bvec(xdr);
581 trace_svcsock_udp_send(xprt, err);
582out_unlock:
583 mutex_unlock(&xprt->xpt_mutex);
584 if (err < 0)
585 return err;
586 return sent;
587
588out_notconn:
589 mutex_unlock(&xprt->xpt_mutex);
590 return -ENOTCONN;
591}
592
593static int svc_udp_has_wspace(struct svc_xprt *xprt)
594{
595 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
596 struct svc_serv *serv = xprt->xpt_server;
597 unsigned long required;
598
599 /*
600 * Set the SOCK_NOSPACE flag before checking the available
601 * sock space.
602 */
603 set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
604 required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
605 if (required*2 > sock_wspace(svsk->sk_sk))
606 return 0;
607 clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
608 return 1;
609}
610
611static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
612{
613 BUG();
614 return NULL;
615}
616
617static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt)
618{
619}
620
621static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
622 struct net *net,
623 struct sockaddr *sa, int salen,
624 int flags)
625{
626 return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
627}
628
629static const struct svc_xprt_ops svc_udp_ops = {
630 .xpo_create = svc_udp_create,
631 .xpo_recvfrom = svc_udp_recvfrom,
632 .xpo_sendto = svc_udp_sendto,
633 .xpo_result_payload = svc_sock_result_payload,
634 .xpo_release_rqst = svc_udp_release_rqst,
635 .xpo_detach = svc_sock_detach,
636 .xpo_free = svc_sock_free,
637 .xpo_has_wspace = svc_udp_has_wspace,
638 .xpo_accept = svc_udp_accept,
639 .xpo_secure_port = svc_sock_secure_port,
640 .xpo_kill_temp_xprt = svc_udp_kill_temp_xprt,
641};
642
643static struct svc_xprt_class svc_udp_class = {
644 .xcl_name = "udp",
645 .xcl_owner = THIS_MODULE,
646 .xcl_ops = &svc_udp_ops,
647 .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
648 .xcl_ident = XPRT_TRANSPORT_UDP,
649};
650
651static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
652{
653 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
654 &svsk->sk_xprt, serv);
655 clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
656 svsk->sk_sk->sk_data_ready = svc_data_ready;
657 svsk->sk_sk->sk_write_space = svc_write_space;
658
659 /* initialise setting must have enough space to
660 * receive and respond to one request.
661 * svc_udp_recvfrom will re-adjust if necessary
662 */
663 svc_sock_setbufsize(svsk, 3);
664
665 /* data might have come in before data_ready set up */
666 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
667 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
668
669 /* make sure we get destination address info */
670 switch (svsk->sk_sk->sk_family) {
671 case AF_INET:
672 ip_sock_set_pktinfo(svsk->sk_sock->sk);
673 break;
674 case AF_INET6:
675 ip6_sock_set_recvpktinfo(svsk->sk_sock->sk);
676 break;
677 default:
678 BUG();
679 }
680}
681
682/*
683 * A data_ready event on a listening socket means there's a connection
684 * pending. Do not use state_change as a substitute for it.
685 */
686static void svc_tcp_listen_data_ready(struct sock *sk)
687{
688 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
689
690 if (svsk) {
691 /* Refer to svc_setup_socket() for details. */
692 rmb();
693 svsk->sk_odata(sk);
694 }
695
696 /*
697 * This callback may called twice when a new connection
698 * is established as a child socket inherits everything
699 * from a parent LISTEN socket.
700 * 1) data_ready method of the parent socket will be called
701 * when one of child sockets become ESTABLISHED.
702 * 2) data_ready method of the child socket may be called
703 * when it receives data before the socket is accepted.
704 * In case of 2, we should ignore it silently.
705 */
706 if (sk->sk_state == TCP_LISTEN) {
707 if (svsk) {
708 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
709 svc_xprt_enqueue(&svsk->sk_xprt);
710 }
711 }
712}
713
714/*
715 * A state change on a connected socket means it's dying or dead.
716 */
717static void svc_tcp_state_change(struct sock *sk)
718{
719 struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
720
721 if (svsk) {
722 /* Refer to svc_setup_socket() for details. */
723 rmb();
724 svsk->sk_ostate(sk);
725 trace_svcsock_tcp_state(&svsk->sk_xprt, svsk->sk_sock);
726 if (sk->sk_state != TCP_ESTABLISHED)
727 svc_xprt_deferred_close(&svsk->sk_xprt);
728 }
729}
730
731/*
732 * Accept a TCP connection
733 */
734static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
735{
736 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
737 struct sockaddr_storage addr;
738 struct sockaddr *sin = (struct sockaddr *) &addr;
739 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
740 struct socket *sock = svsk->sk_sock;
741 struct socket *newsock;
742 struct svc_sock *newsvsk;
743 int err, slen;
744
745 if (!sock)
746 return NULL;
747
748 clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
749 err = kernel_accept(sock, &newsock, O_NONBLOCK);
750 if (err < 0) {
751 if (err == -ENOMEM)
752 printk(KERN_WARNING "%s: no more sockets!\n",
753 serv->sv_name);
754 else if (err != -EAGAIN)
755 net_warn_ratelimited("%s: accept failed (err %d)!\n",
756 serv->sv_name, -err);
757 trace_svcsock_accept_err(xprt, serv->sv_name, err);
758 return NULL;
759 }
760 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
761
762 err = kernel_getpeername(newsock, sin);
763 if (err < 0) {
764 trace_svcsock_getpeername_err(xprt, serv->sv_name, err);
765 goto failed; /* aborted connection or whatever */
766 }
767 slen = err;
768
769 /* Reset the inherited callbacks before calling svc_setup_socket */
770 newsock->sk->sk_state_change = svsk->sk_ostate;
771 newsock->sk->sk_data_ready = svsk->sk_odata;
772 newsock->sk->sk_write_space = svsk->sk_owspace;
773
774 /* make sure that a write doesn't block forever when
775 * low on memory
776 */
777 newsock->sk->sk_sndtimeo = HZ*30;
778
779 newsvsk = svc_setup_socket(serv, newsock,
780 (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
781 if (IS_ERR(newsvsk))
782 goto failed;
783 svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
784 err = kernel_getsockname(newsock, sin);
785 slen = err;
786 if (unlikely(err < 0))
787 slen = offsetof(struct sockaddr, sa_data);
788 svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
789
790 if (sock_is_loopback(newsock->sk))
791 set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
792 else
793 clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
794 if (serv->sv_stats)
795 serv->sv_stats->nettcpconn++;
796
797 return &newsvsk->sk_xprt;
798
799failed:
800 sock_release(newsock);
801 return NULL;
802}
803
804static size_t svc_tcp_restore_pages(struct svc_sock *svsk,
805 struct svc_rqst *rqstp)
806{
807 size_t len = svsk->sk_datalen;
808 unsigned int i, npages;
809
810 if (!len)
811 return 0;
812 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
813 for (i = 0; i < npages; i++) {
814 if (rqstp->rq_pages[i] != NULL)
815 put_page(rqstp->rq_pages[i]);
816 BUG_ON(svsk->sk_pages[i] == NULL);
817 rqstp->rq_pages[i] = svsk->sk_pages[i];
818 svsk->sk_pages[i] = NULL;
819 }
820 rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
821 return len;
822}
823
824static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
825{
826 unsigned int i, len, npages;
827
828 if (svsk->sk_datalen == 0)
829 return;
830 len = svsk->sk_datalen;
831 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
832 for (i = 0; i < npages; i++) {
833 svsk->sk_pages[i] = rqstp->rq_pages[i];
834 rqstp->rq_pages[i] = NULL;
835 }
836}
837
838static void svc_tcp_clear_pages(struct svc_sock *svsk)
839{
840 unsigned int i, len, npages;
841
842 if (svsk->sk_datalen == 0)
843 goto out;
844 len = svsk->sk_datalen;
845 npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
846 for (i = 0; i < npages; i++) {
847 if (svsk->sk_pages[i] == NULL) {
848 WARN_ON_ONCE(1);
849 continue;
850 }
851 put_page(svsk->sk_pages[i]);
852 svsk->sk_pages[i] = NULL;
853 }
854out:
855 svsk->sk_tcplen = 0;
856 svsk->sk_datalen = 0;
857}
858
859/*
860 * Receive fragment record header into sk_marker.
861 */
862static ssize_t svc_tcp_read_marker(struct svc_sock *svsk,
863 struct svc_rqst *rqstp)
864{
865 ssize_t want, len;
866
867 /* If we haven't gotten the record length yet,
868 * get the next four bytes.
869 */
870 if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
871 struct msghdr msg = { NULL };
872 struct kvec iov;
873
874 want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
875 iov.iov_base = ((char *)&svsk->sk_marker) + svsk->sk_tcplen;
876 iov.iov_len = want;
877 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, want);
878 len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);
879 if (len < 0)
880 return len;
881 svsk->sk_tcplen += len;
882 if (len < want) {
883 /* call again to read the remaining bytes */
884 goto err_short;
885 }
886 trace_svcsock_marker(&svsk->sk_xprt, svsk->sk_marker);
887 if (svc_sock_reclen(svsk) + svsk->sk_datalen >
888 svsk->sk_xprt.xpt_server->sv_max_mesg)
889 goto err_too_large;
890 }
891 return svc_sock_reclen(svsk);
892
893err_too_large:
894 net_notice_ratelimited("svc: %s %s RPC fragment too large: %d\n",
895 __func__, svsk->sk_xprt.xpt_server->sv_name,
896 svc_sock_reclen(svsk));
897 svc_xprt_deferred_close(&svsk->sk_xprt);
898err_short:
899 return -EAGAIN;
900}
901
902static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
903{
904 struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
905 struct rpc_rqst *req = NULL;
906 struct kvec *src, *dst;
907 __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
908 __be32 xid;
909 __be32 calldir;
910
911 xid = *p++;
912 calldir = *p;
913
914 if (!bc_xprt)
915 return -EAGAIN;
916 spin_lock(&bc_xprt->queue_lock);
917 req = xprt_lookup_rqst(bc_xprt, xid);
918 if (!req)
919 goto unlock_notfound;
920
921 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
922 /*
923 * XXX!: cheating for now! Only copying HEAD.
924 * But we know this is good enough for now (in fact, for any
925 * callback reply in the forseeable future).
926 */
927 dst = &req->rq_private_buf.head[0];
928 src = &rqstp->rq_arg.head[0];
929 if (dst->iov_len < src->iov_len)
930 goto unlock_eagain; /* whatever; just giving up. */
931 memcpy(dst->iov_base, src->iov_base, src->iov_len);
932 xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
933 rqstp->rq_arg.len = 0;
934 spin_unlock(&bc_xprt->queue_lock);
935 return 0;
936unlock_notfound:
937 printk(KERN_NOTICE
938 "%s: Got unrecognized reply: "
939 "calldir 0x%x xpt_bc_xprt %p xid %08x\n",
940 __func__, ntohl(calldir),
941 bc_xprt, ntohl(xid));
942unlock_eagain:
943 spin_unlock(&bc_xprt->queue_lock);
944 return -EAGAIN;
945}
946
947static void svc_tcp_fragment_received(struct svc_sock *svsk)
948{
949 /* If we have more data, signal svc_xprt_enqueue() to try again */
950 svsk->sk_tcplen = 0;
951 svsk->sk_marker = xdr_zero;
952}
953
954/**
955 * svc_tcp_recvfrom - Receive data from a TCP socket
956 * @rqstp: request structure into which to receive an RPC Call
957 *
958 * Called in a loop when XPT_DATA has been set.
959 *
960 * Read the 4-byte stream record marker, then use the record length
961 * in that marker to set up exactly the resources needed to receive
962 * the next RPC message into @rqstp.
963 *
964 * Returns:
965 * On success, the number of bytes in a received RPC Call, or
966 * %0 if a complete RPC Call message was not ready to return
967 *
968 * The zero return case handles partial receives and callback Replies.
969 * The state of a partial receive is preserved in the svc_sock for
970 * the next call to svc_tcp_recvfrom.
971 */
972static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
973{
974 struct svc_sock *svsk =
975 container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
976 struct svc_serv *serv = svsk->sk_xprt.xpt_server;
977 size_t want, base;
978 ssize_t len;
979 __be32 *p;
980 __be32 calldir;
981
982 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
983 len = svc_tcp_read_marker(svsk, rqstp);
984 if (len < 0)
985 goto error;
986
987 base = svc_tcp_restore_pages(svsk, rqstp);
988 want = len - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
989 len = svc_tcp_read_msg(rqstp, base + want, base);
990 if (len >= 0) {
991 trace_svcsock_tcp_recv(&svsk->sk_xprt, len);
992 svsk->sk_tcplen += len;
993 svsk->sk_datalen += len;
994 }
995 if (len != want || !svc_sock_final_rec(svsk))
996 goto err_incomplete;
997 if (svsk->sk_datalen < 8)
998 goto err_nuts;
999
1000 rqstp->rq_arg.len = svsk->sk_datalen;
1001 rqstp->rq_arg.page_base = 0;
1002 if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
1003 rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
1004 rqstp->rq_arg.page_len = 0;
1005 } else
1006 rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
1007
1008 rqstp->rq_xprt_ctxt = NULL;
1009 rqstp->rq_prot = IPPROTO_TCP;
1010 if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
1011 set_bit(RQ_LOCAL, &rqstp->rq_flags);
1012 else
1013 clear_bit(RQ_LOCAL, &rqstp->rq_flags);
1014
1015 p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
1016 calldir = p[1];
1017 if (calldir)
1018 len = receive_cb_reply(svsk, rqstp);
1019
1020 /* Reset TCP read info */
1021 svsk->sk_datalen = 0;
1022 svc_tcp_fragment_received(svsk);
1023
1024 if (len < 0)
1025 goto error;
1026
1027 svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
1028 if (serv->sv_stats)
1029 serv->sv_stats->nettcpcnt++;
1030
1031 svc_xprt_received(rqstp->rq_xprt);
1032 return rqstp->rq_arg.len;
1033
1034err_incomplete:
1035 svc_tcp_save_pages(svsk, rqstp);
1036 if (len < 0 && len != -EAGAIN)
1037 goto err_delete;
1038 if (len == want)
1039 svc_tcp_fragment_received(svsk);
1040 else
1041 trace_svcsock_tcp_recv_short(&svsk->sk_xprt,
1042 svc_sock_reclen(svsk),
1043 svsk->sk_tcplen - sizeof(rpc_fraghdr));
1044 goto err_noclose;
1045error:
1046 if (len != -EAGAIN)
1047 goto err_delete;
1048 trace_svcsock_tcp_recv_eagain(&svsk->sk_xprt, 0);
1049 goto err_noclose;
1050err_nuts:
1051 svsk->sk_datalen = 0;
1052err_delete:
1053 trace_svcsock_tcp_recv_err(&svsk->sk_xprt, len);
1054 svc_xprt_deferred_close(&svsk->sk_xprt);
1055err_noclose:
1056 svc_xprt_received(rqstp->rq_xprt);
1057 return 0; /* record not complete */
1058}
1059
1060static int svc_tcp_send_kvec(struct socket *sock, const struct kvec *vec,
1061 int flags)
1062{
1063 return kernel_sendpage(sock, virt_to_page(vec->iov_base),
1064 offset_in_page(vec->iov_base),
1065 vec->iov_len, flags);
1066}
1067
1068/*
1069 * kernel_sendpage() is used exclusively to reduce the number of
1070 * copy operations in this path. Therefore the caller must ensure
1071 * that the pages backing @xdr are unchanging.
1072 *
1073 * In addition, the logic assumes that * .bv_len is never larger
1074 * than PAGE_SIZE.
1075 */
1076static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr,
1077 rpc_fraghdr marker, unsigned int *sentp)
1078{
1079 const struct kvec *head = xdr->head;
1080 const struct kvec *tail = xdr->tail;
1081 struct kvec rm = {
1082 .iov_base = &marker,
1083 .iov_len = sizeof(marker),
1084 };
1085 struct msghdr msg = {
1086 .msg_flags = 0,
1087 };
1088 int ret;
1089
1090 *sentp = 0;
1091 ret = xdr_alloc_bvec(xdr, GFP_KERNEL);
1092 if (ret < 0)
1093 return ret;
1094
1095 ret = kernel_sendmsg(sock, &msg, &rm, 1, rm.iov_len);
1096 if (ret < 0)
1097 return ret;
1098 *sentp += ret;
1099 if (ret != rm.iov_len)
1100 return -EAGAIN;
1101
1102 ret = svc_tcp_send_kvec(sock, head, 0);
1103 if (ret < 0)
1104 return ret;
1105 *sentp += ret;
1106 if (ret != head->iov_len)
1107 goto out;
1108
1109 if (xdr->page_len) {
1110 unsigned int offset, len, remaining;
1111 struct bio_vec *bvec;
1112
1113 bvec = xdr->bvec + (xdr->page_base >> PAGE_SHIFT);
1114 offset = offset_in_page(xdr->page_base);
1115 remaining = xdr->page_len;
1116 while (remaining > 0) {
1117 len = min(remaining, bvec->bv_len - offset);
1118 ret = kernel_sendpage(sock, bvec->bv_page,
1119 bvec->bv_offset + offset,
1120 len, 0);
1121 if (ret < 0)
1122 return ret;
1123 *sentp += ret;
1124 if (ret != len)
1125 goto out;
1126 remaining -= len;
1127 offset = 0;
1128 bvec++;
1129 }
1130 }
1131
1132 if (tail->iov_len) {
1133 ret = svc_tcp_send_kvec(sock, tail, 0);
1134 if (ret < 0)
1135 return ret;
1136 *sentp += ret;
1137 }
1138
1139out:
1140 return 0;
1141}
1142
1143/**
1144 * svc_tcp_sendto - Send out a reply on a TCP socket
1145 * @rqstp: completed svc_rqst
1146 *
1147 * xpt_mutex ensures @rqstp's whole message is written to the socket
1148 * without interruption.
1149 *
1150 * Returns the number of bytes sent, or a negative errno.
1151 */
1152static int svc_tcp_sendto(struct svc_rqst *rqstp)
1153{
1154 struct svc_xprt *xprt = rqstp->rq_xprt;
1155 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1156 struct xdr_buf *xdr = &rqstp->rq_res;
1157 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
1158 (u32)xdr->len);
1159 unsigned int sent;
1160 int err;
1161
1162 svc_tcp_release_rqst(rqstp);
1163
1164 atomic_inc(&svsk->sk_sendqlen);
1165 mutex_lock(&xprt->xpt_mutex);
1166 if (svc_xprt_is_dead(xprt))
1167 goto out_notconn;
1168 tcp_sock_set_cork(svsk->sk_sk, true);
1169 err = svc_tcp_sendmsg(svsk->sk_sock, xdr, marker, &sent);
1170 xdr_free_bvec(xdr);
1171 trace_svcsock_tcp_send(xprt, err < 0 ? (long)err : sent);
1172 if (err < 0 || sent != (xdr->len + sizeof(marker)))
1173 goto out_close;
1174 if (atomic_dec_and_test(&svsk->sk_sendqlen))
1175 tcp_sock_set_cork(svsk->sk_sk, false);
1176 mutex_unlock(&xprt->xpt_mutex);
1177 return sent;
1178
1179out_notconn:
1180 atomic_dec(&svsk->sk_sendqlen);
1181 mutex_unlock(&xprt->xpt_mutex);
1182 return -ENOTCONN;
1183out_close:
1184 pr_notice("rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n",
1185 xprt->xpt_server->sv_name,
1186 (err < 0) ? "got error" : "sent",
1187 (err < 0) ? err : sent, xdr->len);
1188 svc_xprt_deferred_close(xprt);
1189 atomic_dec(&svsk->sk_sendqlen);
1190 mutex_unlock(&xprt->xpt_mutex);
1191 return -EAGAIN;
1192}
1193
1194static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
1195 struct net *net,
1196 struct sockaddr *sa, int salen,
1197 int flags)
1198{
1199 return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
1200}
1201
1202static const struct svc_xprt_ops svc_tcp_ops = {
1203 .xpo_create = svc_tcp_create,
1204 .xpo_recvfrom = svc_tcp_recvfrom,
1205 .xpo_sendto = svc_tcp_sendto,
1206 .xpo_result_payload = svc_sock_result_payload,
1207 .xpo_release_rqst = svc_tcp_release_rqst,
1208 .xpo_detach = svc_tcp_sock_detach,
1209 .xpo_free = svc_sock_free,
1210 .xpo_has_wspace = svc_tcp_has_wspace,
1211 .xpo_accept = svc_tcp_accept,
1212 .xpo_secure_port = svc_sock_secure_port,
1213 .xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
1214};
1215
1216static struct svc_xprt_class svc_tcp_class = {
1217 .xcl_name = "tcp",
1218 .xcl_owner = THIS_MODULE,
1219 .xcl_ops = &svc_tcp_ops,
1220 .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
1221 .xcl_ident = XPRT_TRANSPORT_TCP,
1222};
1223
1224void svc_init_xprt_sock(void)
1225{
1226 svc_reg_xprt_class(&svc_tcp_class);
1227 svc_reg_xprt_class(&svc_udp_class);
1228}
1229
1230void svc_cleanup_xprt_sock(void)
1231{
1232 svc_unreg_xprt_class(&svc_tcp_class);
1233 svc_unreg_xprt_class(&svc_udp_class);
1234}
1235
1236static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1237{
1238 struct sock *sk = svsk->sk_sk;
1239
1240 svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
1241 &svsk->sk_xprt, serv);
1242 set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
1243 set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
1244 if (sk->sk_state == TCP_LISTEN) {
1245 strcpy(svsk->sk_xprt.xpt_remotebuf, "listener");
1246 set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
1247 sk->sk_data_ready = svc_tcp_listen_data_ready;
1248 set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
1249 } else {
1250 sk->sk_state_change = svc_tcp_state_change;
1251 sk->sk_data_ready = svc_data_ready;
1252 sk->sk_write_space = svc_write_space;
1253
1254 svsk->sk_marker = xdr_zero;
1255 svsk->sk_tcplen = 0;
1256 svsk->sk_datalen = 0;
1257 memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
1258
1259 tcp_sock_set_nodelay(sk);
1260
1261 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1262 switch (sk->sk_state) {
1263 case TCP_SYN_RECV:
1264 case TCP_ESTABLISHED:
1265 break;
1266 default:
1267 svc_xprt_deferred_close(&svsk->sk_xprt);
1268 }
1269 }
1270}
1271
1272void svc_sock_update_bufs(struct svc_serv *serv)
1273{
1274 /*
1275 * The number of server threads has changed. Update
1276 * rcvbuf and sndbuf accordingly on all sockets
1277 */
1278 struct svc_sock *svsk;
1279
1280 spin_lock_bh(&serv->sv_lock);
1281 list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
1282 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1283 spin_unlock_bh(&serv->sv_lock);
1284}
1285EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
1286
1287/*
1288 * Initialize socket for RPC use and create svc_sock struct
1289 */
1290static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1291 struct socket *sock,
1292 int flags)
1293{
1294 struct svc_sock *svsk;
1295 struct sock *inet;
1296 int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
1297 int err = 0;
1298
1299 svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
1300 if (!svsk)
1301 return ERR_PTR(-ENOMEM);
1302
1303 inet = sock->sk;
1304
1305 /* Register socket with portmapper */
1306 if (pmap_register)
1307 err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
1308 inet->sk_protocol,
1309 ntohs(inet_sk(inet)->inet_sport));
1310
1311 if (err < 0) {
1312 kfree(svsk);
1313 return ERR_PTR(err);
1314 }
1315
1316 svsk->sk_sock = sock;
1317 svsk->sk_sk = inet;
1318 svsk->sk_ostate = inet->sk_state_change;
1319 svsk->sk_odata = inet->sk_data_ready;
1320 svsk->sk_owspace = inet->sk_write_space;
1321 /*
1322 * This barrier is necessary in order to prevent race condition
1323 * with svc_data_ready(), svc_listen_data_ready() and others
1324 * when calling callbacks above.
1325 */
1326 wmb();
1327 inet->sk_user_data = svsk;
1328
1329 /* Initialize the socket */
1330 if (sock->type == SOCK_DGRAM)
1331 svc_udp_init(svsk, serv);
1332 else
1333 svc_tcp_init(svsk, serv);
1334
1335 trace_svcsock_new_socket(sock);
1336 return svsk;
1337}
1338
1339bool svc_alien_sock(struct net *net, int fd)
1340{
1341 int err;
1342 struct socket *sock = sockfd_lookup(fd, &err);
1343 bool ret = false;
1344
1345 if (!sock)
1346 goto out;
1347 if (sock_net(sock->sk) != net)
1348 ret = true;
1349 sockfd_put(sock);
1350out:
1351 return ret;
1352}
1353EXPORT_SYMBOL_GPL(svc_alien_sock);
1354
1355/**
1356 * svc_addsock - add a listener socket to an RPC service
1357 * @serv: pointer to RPC service to which to add a new listener
1358 * @fd: file descriptor of the new listener
1359 * @name_return: pointer to buffer to fill in with name of listener
1360 * @len: size of the buffer
1361 * @cred: credential
1362 *
1363 * Fills in socket name and returns positive length of name if successful.
1364 * Name is terminated with '\n'. On error, returns a negative errno
1365 * value.
1366 */
1367int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
1368 const size_t len, const struct cred *cred)
1369{
1370 int err = 0;
1371 struct socket *so = sockfd_lookup(fd, &err);
1372 struct svc_sock *svsk = NULL;
1373 struct sockaddr_storage addr;
1374 struct sockaddr *sin = (struct sockaddr *)&addr;
1375 int salen;
1376
1377 if (!so)
1378 return err;
1379 err = -EAFNOSUPPORT;
1380 if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
1381 goto out;
1382 err = -EPROTONOSUPPORT;
1383 if (so->sk->sk_protocol != IPPROTO_TCP &&
1384 so->sk->sk_protocol != IPPROTO_UDP)
1385 goto out;
1386 err = -EISCONN;
1387 if (so->state > SS_UNCONNECTED)
1388 goto out;
1389 err = -ENOENT;
1390 if (!try_module_get(THIS_MODULE))
1391 goto out;
1392 svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
1393 if (IS_ERR(svsk)) {
1394 module_put(THIS_MODULE);
1395 err = PTR_ERR(svsk);
1396 goto out;
1397 }
1398 salen = kernel_getsockname(svsk->sk_sock, sin);
1399 if (salen >= 0)
1400 svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
1401 svsk->sk_xprt.xpt_cred = get_cred(cred);
1402 svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
1403 return svc_one_sock_name(svsk, name_return, len);
1404out:
1405 sockfd_put(so);
1406 return err;
1407}
1408EXPORT_SYMBOL_GPL(svc_addsock);
1409
1410/*
1411 * Create socket for RPC service.
1412 */
1413static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
1414 int protocol,
1415 struct net *net,
1416 struct sockaddr *sin, int len,
1417 int flags)
1418{
1419 struct svc_sock *svsk;
1420 struct socket *sock;
1421 int error;
1422 int type;
1423 struct sockaddr_storage addr;
1424 struct sockaddr *newsin = (struct sockaddr *)&addr;
1425 int newlen;
1426 int family;
1427
1428 if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
1429 printk(KERN_WARNING "svc: only UDP and TCP "
1430 "sockets supported\n");
1431 return ERR_PTR(-EINVAL);
1432 }
1433
1434 type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
1435 switch (sin->sa_family) {
1436 case AF_INET6:
1437 family = PF_INET6;
1438 break;
1439 case AF_INET:
1440 family = PF_INET;
1441 break;
1442 default:
1443 return ERR_PTR(-EINVAL);
1444 }
1445
1446 error = __sock_create(net, family, type, protocol, &sock, 1);
1447 if (error < 0)
1448 return ERR_PTR(error);
1449
1450 svc_reclassify_socket(sock);
1451
1452 /*
1453 * If this is an PF_INET6 listener, we want to avoid
1454 * getting requests from IPv4 remotes. Those should
1455 * be shunted to a PF_INET listener via rpcbind.
1456 */
1457 if (family == PF_INET6)
1458 ip6_sock_set_v6only(sock->sk);
1459 if (type == SOCK_STREAM)
1460 sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
1461 error = kernel_bind(sock, sin, len);
1462 if (error < 0)
1463 goto bummer;
1464
1465 error = kernel_getsockname(sock, newsin);
1466 if (error < 0)
1467 goto bummer;
1468 newlen = error;
1469
1470 if (protocol == IPPROTO_TCP) {
1471 if ((error = kernel_listen(sock, 64)) < 0)
1472 goto bummer;
1473 }
1474
1475 svsk = svc_setup_socket(serv, sock, flags);
1476 if (IS_ERR(svsk)) {
1477 error = PTR_ERR(svsk);
1478 goto bummer;
1479 }
1480 svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
1481 return (struct svc_xprt *)svsk;
1482bummer:
1483 sock_release(sock);
1484 return ERR_PTR(error);
1485}
1486
1487/*
1488 * Detach the svc_sock from the socket so that no
1489 * more callbacks occur.
1490 */
1491static void svc_sock_detach(struct svc_xprt *xprt)
1492{
1493 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1494 struct sock *sk = svsk->sk_sk;
1495
1496 /* put back the old socket callbacks */
1497 lock_sock(sk);
1498 sk->sk_state_change = svsk->sk_ostate;
1499 sk->sk_data_ready = svsk->sk_odata;
1500 sk->sk_write_space = svsk->sk_owspace;
1501 sk->sk_user_data = NULL;
1502 release_sock(sk);
1503}
1504
1505/*
1506 * Disconnect the socket, and reset the callbacks
1507 */
1508static void svc_tcp_sock_detach(struct svc_xprt *xprt)
1509{
1510 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1511
1512 svc_sock_detach(xprt);
1513
1514 if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
1515 svc_tcp_clear_pages(svsk);
1516 kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
1517 }
1518}
1519
1520/*
1521 * Free the svc_sock's socket resources and the svc_sock itself.
1522 */
1523static void svc_sock_free(struct svc_xprt *xprt)
1524{
1525 struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
1526
1527 if (svsk->sk_sock->file)
1528 sockfd_put(svsk->sk_sock);
1529 else
1530 sock_release(svsk->sk_sock);
1531 kfree(svsk);
1532}