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Linux/net/sunrpc/svcsock.c

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

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