forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathsvcsock.c
1414 lines (1242 loc) · 37 KB
/
svcsock.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* linux/net/sunrpc/svcsock.c
*
* These are the RPC server socket internals.
*
* The server scheduling algorithm does not always distribute the load
* evenly when servicing a single client. May need to modify the
* svc_xprt_enqueue procedure...
*
* TCP support is largely untested and may be a little slow. The problem
* is that we currently do two separate recvfrom's, one for the 4-byte
* record length, and the second for the actual record. This could possibly
* be improved by always reading a minimum size of around 100 bytes and
* tucking any superfluous bytes away in a temporary store. Still, that
* leaves write requests out in the rain. An alternative may be to peek at
* the first skb in the queue, and if it matches the next TCP sequence
* number, to extract the record marker. Yuck.
*
* Copyright (C) 1995, 1996 Olaf Kirch <[email protected]>
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/file.h>
#include <linux/freezer.h>
#include <net/sock.h>
#include <net/checksum.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/tcp.h>
#include <net/tcp_states.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/stats.h>
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
int *errp, int flags);
static void svc_udp_data_ready(struct sock *, int);
static int svc_udp_recvfrom(struct svc_rqst *);
static int svc_udp_sendto(struct svc_rqst *);
static void svc_sock_detach(struct svc_xprt *);
static void svc_tcp_sock_detach(struct svc_xprt *);
static void svc_sock_free(struct svc_xprt *);
static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
struct sockaddr *, int, int);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key svc_key[2];
static struct lock_class_key svc_slock_key[2];
static void svc_reclassify_socket(struct socket *sock)
{
struct sock *sk = sock->sk;
BUG_ON(sock_owned_by_user(sk));
switch (sk->sk_family) {
case AF_INET:
sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
&svc_slock_key[0],
"sk_xprt.xpt_lock-AF_INET-NFSD",
&svc_key[0]);
break;
case AF_INET6:
sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
&svc_slock_key[1],
"sk_xprt.xpt_lock-AF_INET6-NFSD",
&svc_key[1]);
break;
default:
BUG();
}
}
#else
static void svc_reclassify_socket(struct socket *sock)
{
}
#endif
/*
* Release an skbuff after use
*/
static void svc_release_skb(struct svc_rqst *rqstp)
{
struct sk_buff *skb = rqstp->rq_xprt_ctxt;
if (skb) {
struct svc_sock *svsk =
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
rqstp->rq_xprt_ctxt = NULL;
dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
skb_free_datagram(svsk->sk_sk, skb);
}
}
union svc_pktinfo_u {
struct in_pktinfo pkti;
struct in6_pktinfo pkti6;
};
#define SVC_PKTINFO_SPACE \
CMSG_SPACE(sizeof(union svc_pktinfo_u))
static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
{
struct svc_sock *svsk =
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
switch (svsk->sk_sk->sk_family) {
case AF_INET: {
struct in_pktinfo *pki = CMSG_DATA(cmh);
cmh->cmsg_level = SOL_IP;
cmh->cmsg_type = IP_PKTINFO;
pki->ipi_ifindex = 0;
pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
}
break;
case AF_INET6: {
struct in6_pktinfo *pki = CMSG_DATA(cmh);
cmh->cmsg_level = SOL_IPV6;
cmh->cmsg_type = IPV6_PKTINFO;
pki->ipi6_ifindex = 0;
ipv6_addr_copy(&pki->ipi6_addr,
&rqstp->rq_daddr.addr6);
cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
}
break;
}
return;
}
/*
* Generic sendto routine
*/
static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
{
struct svc_sock *svsk =
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
struct socket *sock = svsk->sk_sock;
int slen;
union {
struct cmsghdr hdr;
long all[SVC_PKTINFO_SPACE / sizeof(long)];
} buffer;
struct cmsghdr *cmh = &buffer.hdr;
int len = 0;
int result;
int size;
struct page **ppage = xdr->pages;
size_t base = xdr->page_base;
unsigned int pglen = xdr->page_len;
unsigned int flags = MSG_MORE;
RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
slen = xdr->len;
if (rqstp->rq_prot == IPPROTO_UDP) {
struct msghdr msg = {
.msg_name = &rqstp->rq_addr,
.msg_namelen = rqstp->rq_addrlen,
.msg_control = cmh,
.msg_controllen = sizeof(buffer),
.msg_flags = MSG_MORE,
};
svc_set_cmsg_data(rqstp, cmh);
if (sock_sendmsg(sock, &msg, 0) < 0)
goto out;
}
/* send head */
if (slen == xdr->head[0].iov_len)
flags = 0;
len = kernel_sendpage(sock, rqstp->rq_respages[0], 0,
xdr->head[0].iov_len, flags);
if (len != xdr->head[0].iov_len)
goto out;
slen -= xdr->head[0].iov_len;
if (slen == 0)
goto out;
/* send page data */
size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
while (pglen > 0) {
if (slen == size)
flags = 0;
result = kernel_sendpage(sock, *ppage, base, size, flags);
if (result > 0)
len += result;
if (result != size)
goto out;
slen -= size;
pglen -= size;
size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
base = 0;
ppage++;
}
/* send tail */
if (xdr->tail[0].iov_len) {
result = kernel_sendpage(sock, rqstp->rq_respages[0],
((unsigned long)xdr->tail[0].iov_base)
& (PAGE_SIZE-1),
xdr->tail[0].iov_len, 0);
if (result > 0)
len += result;
}
out:
dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
return len;
}
/*
* Report socket names for nfsdfs
*/
static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
{
const struct sock *sk = svsk->sk_sk;
const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
"udp" : "tcp";
int len;
switch (sk->sk_family) {
case PF_INET:
len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
proto_name,
&inet_sk(sk)->rcv_saddr,
inet_sk(sk)->num);
break;
case PF_INET6:
len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
proto_name,
&inet6_sk(sk)->rcv_saddr,
inet_sk(sk)->num);
break;
default:
len = snprintf(buf, remaining, "*unknown-%d*\n",
sk->sk_family);
}
if (len >= remaining) {
*buf = '\0';
return -ENAMETOOLONG;
}
return len;
}
/**
* svc_sock_names - construct a list of listener names in a string
* @serv: pointer to RPC service
* @buf: pointer to a buffer to fill in with socket names
* @buflen: size of the buffer to be filled
* @toclose: pointer to '\0'-terminated C string containing the name
* of a listener to be closed
*
* Fills in @buf with a '\n'-separated list of names of listener
* sockets. If @toclose is not NULL, the socket named by @toclose
* is closed, and is not included in the output list.
*
* Returns positive length of the socket name string, or a negative
* errno value on error.
*/
int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
const char *toclose)
{
struct svc_sock *svsk, *closesk = NULL;
int len = 0;
if (!serv)
return 0;
spin_lock_bh(&serv->sv_lock);
list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
if (onelen < 0) {
len = onelen;
break;
}
if (toclose && strcmp(toclose, buf + len) == 0)
closesk = svsk;
else
len += onelen;
}
spin_unlock_bh(&serv->sv_lock);
if (closesk)
/* Should unregister with portmap, but you cannot
* unregister just one protocol...
*/
svc_close_xprt(&closesk->sk_xprt);
else if (toclose)
return -ENOENT;
return len;
}
EXPORT_SYMBOL_GPL(svc_sock_names);
/*
* Check input queue length
*/
static int svc_recv_available(struct svc_sock *svsk)
{
struct socket *sock = svsk->sk_sock;
int avail, err;
err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
return (err >= 0)? avail : err;
}
/*
* Generic recvfrom routine.
*/
static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
int buflen)
{
struct svc_sock *svsk =
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
struct msghdr msg = {
.msg_flags = MSG_DONTWAIT,
};
int len;
rqstp->rq_xprt_hlen = 0;
len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
msg.msg_flags);
dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
svsk, iov[0].iov_base, iov[0].iov_len, len);
return len;
}
/*
* Set socket snd and rcv buffer lengths
*/
static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
unsigned int rcv)
{
#if 0
mm_segment_t oldfs;
oldfs = get_fs(); set_fs(KERNEL_DS);
sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
(char*)&snd, sizeof(snd));
sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
(char*)&rcv, sizeof(rcv));
#else
/* sock_setsockopt limits use to sysctl_?mem_max,
* which isn't acceptable. Until that is made conditional
* on not having CAP_SYS_RESOURCE or similar, we go direct...
* DaveM said I could!
*/
lock_sock(sock->sk);
sock->sk->sk_sndbuf = snd * 2;
sock->sk->sk_rcvbuf = rcv * 2;
sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
sock->sk->sk_write_space(sock->sk);
release_sock(sock->sk);
#endif
}
/*
* INET callback when data has been received on the socket.
*/
static void svc_udp_data_ready(struct sock *sk, int count)
{
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
if (svsk) {
dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
svsk, sk, count,
test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
svc_xprt_enqueue(&svsk->sk_xprt);
}
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
wake_up_interruptible(sk->sk_sleep);
}
/*
* INET callback when space is newly available on the socket.
*/
static void svc_write_space(struct sock *sk)
{
struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
if (svsk) {
dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
svc_xprt_enqueue(&svsk->sk_xprt);
}
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) {
dprintk("RPC svc_write_space: someone sleeping on %p\n",
svsk);
wake_up_interruptible(sk->sk_sleep);
}
}
static void svc_tcp_write_space(struct sock *sk)
{
struct socket *sock = sk->sk_socket;
if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
clear_bit(SOCK_NOSPACE, &sock->flags);
svc_write_space(sk);
}
/*
* Copy the UDP datagram's destination address to the rqstp structure.
* The 'destination' address in this case is the address to which the
* peer sent the datagram, i.e. our local address. For multihomed
* hosts, this can change from msg to msg. Note that only the IP
* address changes, the port number should remain the same.
*/
static void svc_udp_get_dest_address(struct svc_rqst *rqstp,
struct cmsghdr *cmh)
{
struct svc_sock *svsk =
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
switch (svsk->sk_sk->sk_family) {
case AF_INET: {
struct in_pktinfo *pki = CMSG_DATA(cmh);
rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
break;
}
case AF_INET6: {
struct in6_pktinfo *pki = CMSG_DATA(cmh);
ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
break;
}
}
}
/*
* Receive a datagram from a UDP socket.
*/
static int svc_udp_recvfrom(struct svc_rqst *rqstp)
{
struct svc_sock *svsk =
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
struct svc_serv *serv = svsk->sk_xprt.xpt_server;
struct sk_buff *skb;
union {
struct cmsghdr hdr;
long all[SVC_PKTINFO_SPACE / sizeof(long)];
} buffer;
struct cmsghdr *cmh = &buffer.hdr;
struct msghdr msg = {
.msg_name = svc_addr(rqstp),
.msg_control = cmh,
.msg_controllen = sizeof(buffer),
.msg_flags = MSG_DONTWAIT,
};
size_t len;
int err;
if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
/* udp sockets need large rcvbuf as all pending
* requests are still in that buffer. sndbuf must
* also be large enough that there is enough space
* for one reply per thread. We count all threads
* rather than threads in a particular pool, which
* provides an upper bound on the number of threads
* which will access the socket.
*/
svc_sock_setbufsize(svsk->sk_sock,
(serv->sv_nrthreads+3) * serv->sv_max_mesg,
(serv->sv_nrthreads+3) * serv->sv_max_mesg);
clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
skb = NULL;
err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
0, 0, MSG_PEEK | MSG_DONTWAIT);
if (err >= 0)
skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
if (skb == NULL) {
if (err != -EAGAIN) {
/* possibly an icmp error */
dprintk("svc: recvfrom returned error %d\n", -err);
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
}
svc_xprt_received(&svsk->sk_xprt);
return -EAGAIN;
}
len = svc_addr_len(svc_addr(rqstp));
if (len == 0)
return -EAFNOSUPPORT;
rqstp->rq_addrlen = len;
if (skb->tstamp.tv64 == 0) {
skb->tstamp = ktime_get_real();
/* Don't enable netstamp, sunrpc doesn't
need that much accuracy */
}
svsk->sk_sk->sk_stamp = skb->tstamp;
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
/*
* Maybe more packets - kick another thread ASAP.
*/
svc_xprt_received(&svsk->sk_xprt);
len = skb->len - sizeof(struct udphdr);
rqstp->rq_arg.len = len;
rqstp->rq_prot = IPPROTO_UDP;
if (cmh->cmsg_level != IPPROTO_IP ||
cmh->cmsg_type != IP_PKTINFO) {
if (net_ratelimit())
printk("rpcsvc: received unknown control message:"
"%d/%d\n",
cmh->cmsg_level, cmh->cmsg_type);
skb_free_datagram(svsk->sk_sk, skb);
return 0;
}
svc_udp_get_dest_address(rqstp, cmh);
if (skb_is_nonlinear(skb)) {
/* we have to copy */
local_bh_disable();
if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
local_bh_enable();
/* checksum error */
skb_free_datagram(svsk->sk_sk, skb);
return 0;
}
local_bh_enable();
skb_free_datagram(svsk->sk_sk, skb);
} else {
/* we can use it in-place */
rqstp->rq_arg.head[0].iov_base = skb->data +
sizeof(struct udphdr);
rqstp->rq_arg.head[0].iov_len = len;
if (skb_checksum_complete(skb)) {
skb_free_datagram(svsk->sk_sk, skb);
return 0;
}
rqstp->rq_xprt_ctxt = skb;
}
rqstp->rq_arg.page_base = 0;
if (len <= rqstp->rq_arg.head[0].iov_len) {
rqstp->rq_arg.head[0].iov_len = len;
rqstp->rq_arg.page_len = 0;
rqstp->rq_respages = rqstp->rq_pages+1;
} else {
rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
rqstp->rq_respages = rqstp->rq_pages + 1 +
DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
}
if (serv->sv_stats)
serv->sv_stats->netudpcnt++;
return len;
}
static int
svc_udp_sendto(struct svc_rqst *rqstp)
{
int error;
error = svc_sendto(rqstp, &rqstp->rq_res);
if (error == -ECONNREFUSED)
/* ICMP error on earlier request. */
error = svc_sendto(rqstp, &rqstp->rq_res);
return error;
}
static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp)
{
}
static int svc_udp_has_wspace(struct svc_xprt *xprt)
{
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
struct svc_serv *serv = xprt->xpt_server;
unsigned long required;
/*
* Set the SOCK_NOSPACE flag before checking the available
* sock space.
*/
set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
if (required*2 > sock_wspace(svsk->sk_sk))
return 0;
clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
return 1;
}
static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
{
BUG();
return NULL;
}
static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
struct sockaddr *sa, int salen,
int flags)
{
return svc_create_socket(serv, IPPROTO_UDP, sa, salen, flags);
}
static struct svc_xprt_ops svc_udp_ops = {
.xpo_create = svc_udp_create,
.xpo_recvfrom = svc_udp_recvfrom,
.xpo_sendto = svc_udp_sendto,
.xpo_release_rqst = svc_release_skb,
.xpo_detach = svc_sock_detach,
.xpo_free = svc_sock_free,
.xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
.xpo_has_wspace = svc_udp_has_wspace,
.xpo_accept = svc_udp_accept,
};
static struct svc_xprt_class svc_udp_class = {
.xcl_name = "udp",
.xcl_owner = THIS_MODULE,
.xcl_ops = &svc_udp_ops,
.xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
};
static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
{
int one = 1;
mm_segment_t oldfs;
svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv);
clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
svsk->sk_sk->sk_write_space = svc_write_space;
/* initialise setting must have enough space to
* receive and respond to one request.
* svc_udp_recvfrom will re-adjust if necessary
*/
svc_sock_setbufsize(svsk->sk_sock,
3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
/* data might have come in before data_ready set up */
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
oldfs = get_fs();
set_fs(KERNEL_DS);
/* make sure we get destination address info */
svsk->sk_sock->ops->setsockopt(svsk->sk_sock, IPPROTO_IP, IP_PKTINFO,
(char __user *)&one, sizeof(one));
set_fs(oldfs);
}
/*
* A data_ready event on a listening socket means there's a connection
* pending. Do not use state_change as a substitute for it.
*/
static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused)
{
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
dprintk("svc: socket %p TCP (listen) state change %d\n",
sk, sk->sk_state);
/*
* This callback may called twice when a new connection
* is established as a child socket inherits everything
* from a parent LISTEN socket.
* 1) data_ready method of the parent socket will be called
* when one of child sockets become ESTABLISHED.
* 2) data_ready method of the child socket may be called
* when it receives data before the socket is accepted.
* In case of 2, we should ignore it silently.
*/
if (sk->sk_state == TCP_LISTEN) {
if (svsk) {
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
svc_xprt_enqueue(&svsk->sk_xprt);
} else
printk("svc: socket %p: no user data\n", sk);
}
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
wake_up_interruptible_all(sk->sk_sleep);
}
/*
* A state change on a connected socket means it's dying or dead.
*/
static void svc_tcp_state_change(struct sock *sk)
{
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
sk, sk->sk_state, sk->sk_user_data);
if (!svsk)
printk("svc: socket %p: no user data\n", sk);
else {
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
svc_xprt_enqueue(&svsk->sk_xprt);
}
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
wake_up_interruptible_all(sk->sk_sleep);
}
static void svc_tcp_data_ready(struct sock *sk, int count)
{
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
dprintk("svc: socket %p TCP data ready (svsk %p)\n",
sk, sk->sk_user_data);
if (svsk) {
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
svc_xprt_enqueue(&svsk->sk_xprt);
}
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
wake_up_interruptible(sk->sk_sleep);
}
/*
* Accept a TCP connection
*/
static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
{
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
struct sockaddr_storage addr;
struct sockaddr *sin = (struct sockaddr *) &addr;
struct svc_serv *serv = svsk->sk_xprt.xpt_server;
struct socket *sock = svsk->sk_sock;
struct socket *newsock;
struct svc_sock *newsvsk;
int err, slen;
RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
if (!sock)
return NULL;
clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
err = kernel_accept(sock, &newsock, O_NONBLOCK);
if (err < 0) {
if (err == -ENOMEM)
printk(KERN_WARNING "%s: no more sockets!\n",
serv->sv_name);
else if (err != -EAGAIN && net_ratelimit())
printk(KERN_WARNING "%s: accept failed (err %d)!\n",
serv->sv_name, -err);
return NULL;
}
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
err = kernel_getpeername(newsock, sin, &slen);
if (err < 0) {
if (net_ratelimit())
printk(KERN_WARNING "%s: peername failed (err %d)!\n",
serv->sv_name, -err);
goto failed; /* aborted connection or whatever */
}
/* Ideally, we would want to reject connections from unauthorized
* hosts here, but when we get encryption, the IP of the host won't
* tell us anything. For now just warn about unpriv connections.
*/
if (!svc_port_is_privileged(sin)) {
dprintk(KERN_WARNING
"%s: connect from unprivileged port: %s\n",
serv->sv_name,
__svc_print_addr(sin, buf, sizeof(buf)));
}
dprintk("%s: connect from %s\n", serv->sv_name,
__svc_print_addr(sin, buf, sizeof(buf)));
/* make sure that a write doesn't block forever when
* low on memory
*/
newsock->sk->sk_sndtimeo = HZ*30;
if (!(newsvsk = svc_setup_socket(serv, newsock, &err,
(SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
goto failed;
svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
err = kernel_getsockname(newsock, sin, &slen);
if (unlikely(err < 0)) {
dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
slen = offsetof(struct sockaddr, sa_data);
}
svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
if (serv->sv_stats)
serv->sv_stats->nettcpconn++;
return &newsvsk->sk_xprt;
failed:
sock_release(newsock);
return NULL;
}
/*
* Receive data from a TCP socket.
*/
static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
{
struct svc_sock *svsk =
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
struct svc_serv *serv = svsk->sk_xprt.xpt_server;
int len;
struct kvec *vec;
int pnum, vlen;
dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
/* sndbuf needs to have room for one request
* per thread, otherwise we can stall even when the
* network isn't a bottleneck.
*
* We count all threads rather than threads in a
* particular pool, which provides an upper bound
* on the number of threads which will access the socket.
*
* rcvbuf just needs to be able to hold a few requests.
* Normally they will be removed from the queue
* as soon a a complete request arrives.
*/
svc_sock_setbufsize(svsk->sk_sock,
(serv->sv_nrthreads+3) * serv->sv_max_mesg,
3 * serv->sv_max_mesg);
clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
/* Receive data. If we haven't got the record length yet, get
* the next four bytes. Otherwise try to gobble up as much as
* possible up to the complete record length.
*/
if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
int want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
struct kvec iov;
iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
iov.iov_len = want;
if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
goto error;
svsk->sk_tcplen += len;
if (len < want) {
dprintk("svc: short recvfrom while reading record "
"length (%d of %d)\n", len, want);
svc_xprt_received(&svsk->sk_xprt);
return -EAGAIN; /* record header not complete */
}
svsk->sk_reclen = ntohl(svsk->sk_reclen);
if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
/* FIXME: technically, a record can be fragmented,
* and non-terminal fragments will not have the top
* bit set in the fragment length header.
* But apparently no known nfs clients send fragmented
* records. */
if (net_ratelimit())
printk(KERN_NOTICE "RPC: multiple fragments "
"per record not supported\n");
goto err_delete;
}
svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
if (svsk->sk_reclen > serv->sv_max_mesg) {
if (net_ratelimit())
printk(KERN_NOTICE "RPC: "
"fragment too large: 0x%08lx\n",
(unsigned long)svsk->sk_reclen);
goto err_delete;
}
}
/* Check whether enough data is available */
len = svc_recv_available(svsk);
if (len < 0)
goto error;
if (len < svsk->sk_reclen) {
dprintk("svc: incomplete TCP record (%d of %d)\n",
len, svsk->sk_reclen);
svc_xprt_received(&svsk->sk_xprt);
return -EAGAIN; /* record not complete */
}
len = svsk->sk_reclen;
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
vec = rqstp->rq_vec;
vec[0] = rqstp->rq_arg.head[0];
vlen = PAGE_SIZE;
pnum = 1;
while (vlen < len) {
vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]);
vec[pnum].iov_len = PAGE_SIZE;
pnum++;
vlen += PAGE_SIZE;
}
rqstp->rq_respages = &rqstp->rq_pages[pnum];
/* Now receive data */
len = svc_recvfrom(rqstp, vec, pnum, len);
if (len < 0)
goto error;
dprintk("svc: TCP complete record (%d bytes)\n", len);
rqstp->rq_arg.len = len;
rqstp->rq_arg.page_base = 0;
if (len <= rqstp->rq_arg.head[0].iov_len) {
rqstp->rq_arg.head[0].iov_len = len;
rqstp->rq_arg.page_len = 0;
} else {
rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
}
rqstp->rq_xprt_ctxt = NULL;
rqstp->rq_prot = IPPROTO_TCP;
/* Reset TCP read info */
svsk->sk_reclen = 0;
svsk->sk_tcplen = 0;
svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
svc_xprt_received(&svsk->sk_xprt);
if (serv->sv_stats)
serv->sv_stats->nettcpcnt++;
return len;
err_delete:
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
return -EAGAIN;
error:
if (len == -EAGAIN) {
dprintk("RPC: TCP recvfrom got EAGAIN\n");
svc_xprt_received(&svsk->sk_xprt);
} else {
printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
svsk->sk_xprt.xpt_server->sv_name, -len);
goto err_delete;
}
return len;
}
/*
* Send out data on TCP socket.
*/
static int svc_tcp_sendto(struct svc_rqst *rqstp)
{
struct xdr_buf *xbufp = &rqstp->rq_res;
int sent;
__be32 reclen;
/* Set up the first element of the reply kvec.
* Any other kvecs that may be in use have been taken
* care of by the server implementation itself.
*/
reclen = htonl(0x80000000|((xbufp->len ) - 4));
memcpy(xbufp->head[0].iov_base, &reclen, 4);
if (test_bit(XPT_DEAD, &rqstp->rq_xprt->xpt_flags))
return -ENOTCONN;
sent = svc_sendto(rqstp, &rqstp->rq_res);
if (sent != xbufp->len) {