Commit | Line | Data |
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a2907882 KM |
1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Rick Macklem at The University of Guelph. | |
7 | * | |
8 | * Redistribution and use in source and binary forms are permitted | |
9 | * provided that the above copyright notice and this paragraph are | |
10 | * duplicated in all such forms and that any documentation, | |
11 | * advertising materials, and other materials related to such | |
12 | * distribution and use acknowledge that the software was developed | |
13 | * by the University of California, Berkeley. The name of the | |
14 | * University may not be used to endorse or promote products derived | |
15 | * from this software without specific prior written permission. | |
16 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
18 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
19 | * | |
170bfd05 | 20 | * @(#)nfs_socket.c 7.17 (Berkeley) %G% |
a2907882 KM |
21 | */ |
22 | ||
23 | /* | |
f0f1cbaa | 24 | * Socket operations for use by nfs |
a2907882 KM |
25 | */ |
26 | ||
27 | #include "types.h" | |
28 | #include "param.h" | |
29 | #include "uio.h" | |
30 | #include "user.h" | |
2f08b65a KM |
31 | #include "proc.h" |
32 | #include "signal.h" | |
a2907882 KM |
33 | #include "mount.h" |
34 | #include "kernel.h" | |
35 | #include "malloc.h" | |
36 | #include "mbuf.h" | |
37 | #include "vnode.h" | |
38 | #include "domain.h" | |
39 | #include "protosw.h" | |
40 | #include "socket.h" | |
41 | #include "socketvar.h" | |
37ced908 KM |
42 | #include "../netinet/in.h" |
43 | #include "../netinet/tcp.h" | |
a2907882 KM |
44 | #include "rpcv2.h" |
45 | #include "nfsv2.h" | |
46 | #include "nfs.h" | |
47 | #include "xdr_subs.h" | |
48 | #include "nfsm_subs.h" | |
49 | #include "nfsmount.h" | |
50 | ||
2f08b65a | 51 | #include "syslog.h" |
2f08b65a | 52 | |
a2907882 | 53 | #define TRUE 1 |
170bfd05 | 54 | #define FALSE 0 |
a2907882 | 55 | |
a2907882 KM |
56 | /* |
57 | * External data, mostly RPC constants in XDR form | |
58 | */ | |
59 | extern u_long rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, rpc_auth_unix, | |
60 | rpc_msgaccepted, rpc_call; | |
61 | extern u_long nfs_prog, nfs_vers; | |
170bfd05 | 62 | /* Maybe these should be bits in a u_long ?? */ |
f0f1cbaa KM |
63 | extern int nonidempotent[NFS_NPROCS]; |
64 | int nfs_sbwait(); | |
65 | void nfs_disconnect(); | |
66 | ||
a2907882 KM |
67 | int nfsrv_null(), |
68 | nfsrv_getattr(), | |
69 | nfsrv_setattr(), | |
70 | nfsrv_lookup(), | |
71 | nfsrv_readlink(), | |
72 | nfsrv_read(), | |
73 | nfsrv_write(), | |
74 | nfsrv_create(), | |
75 | nfsrv_remove(), | |
76 | nfsrv_rename(), | |
77 | nfsrv_link(), | |
78 | nfsrv_symlink(), | |
79 | nfsrv_mkdir(), | |
80 | nfsrv_rmdir(), | |
81 | nfsrv_readdir(), | |
82 | nfsrv_statfs(), | |
83 | nfsrv_noop(); | |
84 | ||
85 | int (*nfsrv_procs[NFS_NPROCS])() = { | |
86 | nfsrv_null, | |
87 | nfsrv_getattr, | |
88 | nfsrv_setattr, | |
89 | nfsrv_noop, | |
90 | nfsrv_lookup, | |
91 | nfsrv_readlink, | |
92 | nfsrv_read, | |
93 | nfsrv_noop, | |
94 | nfsrv_write, | |
95 | nfsrv_create, | |
96 | nfsrv_remove, | |
97 | nfsrv_rename, | |
98 | nfsrv_link, | |
99 | nfsrv_symlink, | |
100 | nfsrv_mkdir, | |
101 | nfsrv_rmdir, | |
102 | nfsrv_readdir, | |
103 | nfsrv_statfs, | |
104 | }; | |
105 | ||
2f08b65a KM |
106 | struct nfsreq nfsreqh; |
107 | int nfsrexmtthresh = NFS_FISHY; | |
f0f1cbaa | 108 | int nfs_tcpnodelay = 1; |
2f08b65a KM |
109 | |
110 | /* | |
f0f1cbaa | 111 | * Initialize sockets and congestion for a new NFS connection. |
2f08b65a KM |
112 | * We do not free the sockaddr if error. |
113 | */ | |
f0f1cbaa | 114 | nfs_connect(nmp) |
2f08b65a | 115 | register struct nfsmount *nmp; |
2f08b65a | 116 | { |
f0f1cbaa KM |
117 | register struct socket *so; |
118 | int s, error; | |
2f08b65a | 119 | struct mbuf *m; |
2f08b65a | 120 | |
f0f1cbaa KM |
121 | nmp->nm_so = (struct socket *)0; |
122 | if (error = socreate(mtod(nmp->nm_nam, struct sockaddr *)->sa_family, | |
123 | &nmp->nm_so, nmp->nm_sotype, nmp->nm_soproto)) | |
2f08b65a | 124 | goto bad; |
f0f1cbaa KM |
125 | so = nmp->nm_so; |
126 | nmp->nm_soflags = so->so_proto->pr_flags; | |
2f08b65a | 127 | |
f0f1cbaa KM |
128 | /* |
129 | * Protocols that do not require connections may be optionally left | |
130 | * unconnected for servers that reply from a port other than NFS_PORT. | |
131 | */ | |
132 | if (nmp->nm_flag & NFSMNT_NOCONN) { | |
133 | if (nmp->nm_soflags & PR_CONNREQUIRED) { | |
134 | error = ENOTCONN; | |
2f08b65a KM |
135 | goto bad; |
136 | } | |
f0f1cbaa KM |
137 | } else { |
138 | if (error = soconnect(so, nmp->nm_nam)) | |
2f08b65a | 139 | goto bad; |
f0f1cbaa KM |
140 | |
141 | /* | |
142 | * Wait for the connection to complete. Cribbed from the | |
143 | * connect system call but with the wait at negative prio. | |
144 | */ | |
145 | s = splnet(); | |
146 | while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) | |
170bfd05 | 147 | (void) tsleep((caddr_t)&so->so_timeo, PSOCK, "nfscon", 0); |
f0f1cbaa KM |
148 | splx(s); |
149 | if (so->so_error) { | |
150 | error = so->so_error; | |
151 | goto bad; | |
152 | } | |
2f08b65a | 153 | } |
f0f1cbaa | 154 | if (nmp->nm_sotype == SOCK_DGRAM) { |
170bfd05 | 155 | if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_SPONGY | NFSMNT_INT)) { |
f0f1cbaa KM |
156 | so->so_rcv.sb_timeo = (5 * hz); |
157 | so->so_snd.sb_timeo = (5 * hz); | |
158 | } else { | |
159 | so->so_rcv.sb_timeo = 0; | |
160 | so->so_snd.sb_timeo = 0; | |
161 | } | |
162 | if (error = soreserve(so, nmp->nm_wsize + NFS_MAXPKTHDR, | |
170bfd05 | 163 | nmp->nm_rsize + NFS_MAXPKTHDR)) |
f0f1cbaa KM |
164 | goto bad; |
165 | } else { | |
170bfd05 | 166 | if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_SPONGY | NFSMNT_INT)) { |
f0f1cbaa KM |
167 | so->so_rcv.sb_timeo = (5 * hz); |
168 | so->so_snd.sb_timeo = (5 * hz); | |
169 | } else { | |
170 | so->so_rcv.sb_timeo = 0; | |
171 | so->so_snd.sb_timeo = 0; | |
172 | } | |
173 | if (so->so_proto->pr_flags & PR_CONNREQUIRED) { | |
174 | MGET(m, M_WAIT, MT_SOOPTS); | |
175 | *mtod(m, int *) = 1; | |
176 | m->m_len = sizeof(int); | |
177 | sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); | |
178 | } | |
179 | if (so->so_proto->pr_domain->dom_family == AF_INET && | |
180 | so->so_proto->pr_protocol == IPPROTO_TCP && | |
181 | nfs_tcpnodelay) { | |
182 | MGET(m, M_WAIT, MT_SOOPTS); | |
183 | *mtod(m, int *) = 1; | |
184 | m->m_len = sizeof(int); | |
185 | sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); | |
186 | } | |
187 | if (error = soreserve(so, | |
170bfd05 | 188 | nmp->nm_wsize + NFS_MAXPKTHDR + sizeof(u_long), |
f0f1cbaa KM |
189 | nmp->nm_rsize + NFS_MAXPKTHDR + sizeof(u_long))) |
190 | goto bad; | |
191 | } | |
192 | so->so_rcv.sb_flags |= SB_NOINTR; | |
193 | so->so_snd.sb_flags |= SB_NOINTR; | |
2f08b65a | 194 | |
f0f1cbaa KM |
195 | /* Initialize other non-zero congestion variables */ |
196 | nmp->nm_rto = NFS_TIMEO; | |
197 | nmp->nm_window = 2; /* Initial send window */ | |
198 | nmp->nm_ssthresh = NFS_MAXWINDOW; /* Slowstart threshold */ | |
199 | nmp->nm_rttvar = nmp->nm_rto << 1; | |
200 | nmp->nm_sent = 0; | |
201 | nmp->nm_currexmit = 0; | |
202 | return (0); | |
2f08b65a | 203 | |
f0f1cbaa KM |
204 | bad: |
205 | nfs_disconnect(nmp); | |
206 | return (error); | |
207 | } | |
2f08b65a | 208 | |
f0f1cbaa KM |
209 | /* |
210 | * Reconnect routine: | |
211 | * Called when a connection is broken on a reliable protocol. | |
212 | * - clean up the old socket | |
213 | * - nfs_connect() again | |
214 | * - set R_MUSTRESEND for all outstanding requests on mount point | |
215 | * If this fails the mount point is DEAD! | |
216 | * nb: Must be called with the nfs_solock() set on the mount point. | |
217 | */ | |
218 | nfs_reconnect(rep, nmp) | |
219 | register struct nfsreq *rep; | |
220 | register struct nfsmount *nmp; | |
221 | { | |
222 | register struct nfsreq *rp; | |
f0f1cbaa | 223 | int error; |
2f08b65a | 224 | |
f0f1cbaa | 225 | if (rep->r_procp) |
5580a343 | 226 | tprintf(rep->r_procp->p_session, |
f0f1cbaa KM |
227 | "Nfs server %s, trying reconnect\n", |
228 | nmp->nm_mountp->mnt_stat.f_mntfromname); | |
229 | else | |
5580a343 | 230 | tprintf(NULL, "Nfs server %s, trying a reconnect\n", |
f0f1cbaa KM |
231 | nmp->nm_mountp->mnt_stat.f_mntfromname); |
232 | while (error = nfs_connect(nmp)) { | |
d4e5799e KM |
233 | #ifdef lint |
234 | error = error; | |
235 | #endif /* lint */ | |
f0f1cbaa KM |
236 | if ((nmp->nm_flag & NFSMNT_INT) && nfs_sigintr(rep->r_procp)) |
237 | return (EINTR); | |
170bfd05 | 238 | (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0); |
2f08b65a | 239 | } |
f0f1cbaa | 240 | if (rep->r_procp) |
5580a343 | 241 | tprintf(rep->r_procp->p_session, |
f0f1cbaa KM |
242 | "Nfs server %s, reconnected\n", |
243 | nmp->nm_mountp->mnt_stat.f_mntfromname); | |
244 | else | |
5580a343 | 245 | tprintf(NULL, "Nfs server %s, reconnected\n", |
f0f1cbaa KM |
246 | nmp->nm_mountp->mnt_stat.f_mntfromname); |
247 | ||
248 | /* | |
249 | * Loop through outstanding request list and fix up all requests | |
250 | * on old socket. | |
251 | */ | |
252 | rp = nfsreqh.r_next; | |
253 | while (rp != &nfsreqh) { | |
254 | if (rp->r_nmp == nmp) | |
255 | rp->r_flags |= R_MUSTRESEND; | |
256 | rp = rp->r_next; | |
2f08b65a KM |
257 | } |
258 | return (0); | |
2f08b65a KM |
259 | } |
260 | ||
261 | /* | |
262 | * NFS disconnect. Clean up and unlink. | |
263 | */ | |
f0f1cbaa | 264 | void |
2f08b65a KM |
265 | nfs_disconnect(nmp) |
266 | register struct nfsmount *nmp; | |
267 | { | |
f0f1cbaa | 268 | register struct socket *so; |
2f08b65a | 269 | |
f0f1cbaa KM |
270 | if (nmp->nm_so) { |
271 | so = nmp->nm_so; | |
272 | nmp->nm_so = (struct socket *)0; | |
273 | soshutdown(so, 2); | |
274 | soclose(so); | |
2f08b65a KM |
275 | } |
276 | } | |
a2907882 KM |
277 | |
278 | /* | |
f0f1cbaa KM |
279 | * This is the nfs send routine. For connection based socket types, it |
280 | * must be called with an nfs_solock() on the socket. | |
281 | * "rep == NULL" indicates that it has been called from a server. | |
a2907882 | 282 | */ |
f0f1cbaa | 283 | nfs_send(so, nam, top, rep) |
a2907882 KM |
284 | register struct socket *so; |
285 | struct mbuf *nam; | |
f0f1cbaa KM |
286 | register struct mbuf *top; |
287 | struct nfsreq *rep; | |
a2907882 | 288 | { |
f0f1cbaa KM |
289 | struct mbuf *sendnam; |
290 | int error, soflags; | |
a2907882 | 291 | |
f0f1cbaa KM |
292 | if (rep) { |
293 | if (rep->r_flags & R_SOFTTERM) { | |
2f08b65a | 294 | m_freem(top); |
f0f1cbaa | 295 | return (EINTR); |
2f08b65a | 296 | } |
5044b7a3 | 297 | if (rep->r_nmp->nm_so == NULL && |
f0f1cbaa KM |
298 | (error = nfs_reconnect(rep, rep->r_nmp))) |
299 | return (error); | |
300 | rep->r_flags &= ~R_MUSTRESEND; | |
5044b7a3 | 301 | so = rep->r_nmp->nm_so; |
f0f1cbaa KM |
302 | soflags = rep->r_nmp->nm_soflags; |
303 | } else | |
304 | soflags = so->so_proto->pr_flags; | |
305 | if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) | |
306 | sendnam = (struct mbuf *)0; | |
307 | else | |
308 | sendnam = nam; | |
309 | ||
310 | error = sosend(so, sendnam, (struct uio *)0, top, | |
311 | (struct mbuf *)0, 0); | |
312 | if (error == EWOULDBLOCK && rep) { | |
313 | if (rep->r_flags & R_SOFTTERM) | |
314 | error = EINTR; | |
315 | else { | |
316 | rep->r_flags |= R_MUSTRESEND; | |
317 | error = 0; | |
2f08b65a | 318 | } |
a2907882 | 319 | } |
f0f1cbaa KM |
320 | /* |
321 | * Ignore socket errors?? | |
322 | */ | |
323 | if (error && error != EINTR && error != ERESTART) | |
324 | error = 0; | |
a2907882 KM |
325 | return (error); |
326 | } | |
327 | ||
328 | /* | |
f0f1cbaa KM |
329 | * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all |
330 | * done by soreceive(), but for SOCK_STREAM we must deal with the Record | |
331 | * Mark and consolidate the data into a new mbuf list. | |
332 | * nb: Sometimes TCP passes the data up to soreceive() in long lists of | |
333 | * small mbufs. | |
334 | * For SOCK_STREAM we must be very careful to read an entire record once | |
335 | * we have read any of it, even if the system call has been interrupted. | |
a2907882 | 336 | */ |
f0f1cbaa | 337 | nfs_receive(so, aname, mp, rep) |
a2907882 KM |
338 | register struct socket *so; |
339 | struct mbuf **aname; | |
340 | struct mbuf **mp; | |
f0f1cbaa | 341 | register struct nfsreq *rep; |
a2907882 | 342 | { |
f0f1cbaa KM |
343 | struct uio auio; |
344 | struct iovec aio; | |
a2907882 | 345 | register struct mbuf *m; |
f0f1cbaa KM |
346 | struct mbuf *m2, *m3, *mnew, **mbp; |
347 | caddr_t fcp, tcp; | |
348 | u_long len; | |
349 | struct mbuf **getnam; | |
350 | int error, siz, mlen, soflags, rcvflg = MSG_WAITALL; | |
a2907882 | 351 | |
f0f1cbaa KM |
352 | /* |
353 | * Set up arguments for soreceive() | |
354 | */ | |
355 | *mp = (struct mbuf *)0; | |
356 | *aname = (struct mbuf *)0; | |
357 | if (rep) | |
358 | soflags = rep->r_nmp->nm_soflags; | |
359 | else | |
360 | soflags = so->so_proto->pr_flags; | |
a2907882 | 361 | |
f0f1cbaa KM |
362 | /* |
363 | * For reliable protocols, lock against other senders/receivers | |
364 | * in case a reconnect is necessary. | |
365 | * For SOCK_STREAM, first get the Record Mark to find out how much | |
366 | * more there is to get. | |
367 | * We must lock the socket against other receivers | |
368 | * until we have an entire rpc request/reply. | |
369 | */ | |
370 | if (soflags & PR_CONNREQUIRED) { | |
371 | tryagain: | |
372 | /* | |
373 | * Check for fatal errors and resending request. | |
374 | */ | |
375 | if (rep) { | |
376 | /* | |
377 | * Ugh: If a reconnect attempt just happened, nm_so | |
378 | * would have changed. NULL indicates a failed | |
379 | * attempt that has essentially shut down this | |
380 | * mount point. | |
381 | */ | |
382 | if (rep->r_mrep || (so = rep->r_nmp->nm_so) == NULL || | |
383 | (rep->r_flags & R_SOFTTERM)) | |
384 | return (EINTR); | |
385 | while (rep->r_flags & R_MUSTRESEND) { | |
386 | m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); | |
387 | nfsstats.rpcretries++; | |
388 | if (error = nfs_send(so, rep->r_nmp->nm_nam, m, | |
389 | rep)) | |
390 | goto errout; | |
2f08b65a | 391 | } |
e8540f59 | 392 | } |
f0f1cbaa KM |
393 | if ((soflags & PR_ATOMIC) == 0) { |
394 | aio.iov_base = (caddr_t) &len; | |
395 | aio.iov_len = sizeof(u_long); | |
396 | auio.uio_iov = &aio; | |
397 | auio.uio_iovcnt = 1; | |
398 | auio.uio_segflg = UIO_SYSSPACE; | |
399 | auio.uio_rw = UIO_READ; | |
400 | auio.uio_offset = 0; | |
401 | auio.uio_resid = sizeof(u_long); | |
402 | do { | |
403 | error = soreceive(so, (struct mbuf **)0, &auio, | |
404 | (struct mbuf **)0, (struct mbuf **)0, &rcvflg); | |
405 | if (error == EWOULDBLOCK && rep) { | |
406 | if (rep->r_flags & R_SOFTTERM) | |
407 | return (EINTR); | |
408 | if (rep->r_flags & R_MUSTRESEND) | |
409 | goto tryagain; | |
410 | } | |
411 | } while (error == EWOULDBLOCK); | |
412 | if (!error && auio.uio_resid > 0) | |
413 | error = EPIPE; | |
414 | if (error) | |
415 | goto errout; | |
416 | len = ntohl(len) & ~0x80000000; | |
417 | /* | |
418 | * This is SERIOUS! We are out of sync with the sender | |
419 | * and forcing a disconnect/reconnect is all I can do. | |
420 | */ | |
421 | if (len > NFS_MAXPACKET) { | |
422 | error = EFBIG; | |
423 | goto errout; | |
424 | } | |
425 | auio.uio_resid = len; | |
426 | do { | |
427 | error = soreceive(so, (struct mbuf **)0, | |
428 | &auio, mp, (struct mbuf **)0, &rcvflg); | |
429 | } while (error == EWOULDBLOCK || error == EINTR || | |
430 | error == ERESTART); | |
431 | if (!error && auio.uio_resid > 0) | |
432 | error = EPIPE; | |
2f08b65a | 433 | } else { |
f0f1cbaa KM |
434 | auio.uio_resid = len = 1000000; /* Anything Big */ |
435 | do { | |
436 | error = soreceive(so, (struct mbuf **)0, | |
437 | &auio, mp, (struct mbuf **)0, &rcvflg); | |
438 | if (error == EWOULDBLOCK && rep) { | |
439 | if (rep->r_flags & R_SOFTTERM) | |
440 | return (EINTR); | |
441 | if (rep->r_flags & R_MUSTRESEND) | |
442 | goto tryagain; | |
443 | } | |
444 | } while (error == EWOULDBLOCK); | |
445 | if (!error && *mp == NULL) | |
446 | error = EPIPE; | |
447 | len -= auio.uio_resid; | |
2f08b65a | 448 | } |
f0f1cbaa KM |
449 | errout: |
450 | if (error && rep && error != EINTR && error != ERESTART) { | |
451 | m_freem(*mp); | |
452 | *mp = (struct mbuf *)0; | |
453 | nfs_disconnect(rep->r_nmp); | |
454 | error = nfs_reconnect(rep, rep->r_nmp); | |
455 | if (!error) | |
456 | goto tryagain; | |
2f08b65a | 457 | } |
f0f1cbaa KM |
458 | } else { |
459 | if (so->so_state & SS_ISCONNECTED) | |
460 | getnam = (struct mbuf **)0; | |
461 | else | |
462 | getnam = aname; | |
463 | auio.uio_resid = len = 1000000; | |
464 | do { | |
465 | error = soreceive(so, getnam, &auio, mp, | |
466 | (struct mbuf **)0, &rcvflg); | |
467 | if (error == EWOULDBLOCK && rep && | |
468 | (rep->r_flags & R_SOFTTERM)) | |
469 | return (EINTR); | |
470 | } while (error == EWOULDBLOCK); | |
471 | len -= auio.uio_resid; | |
472 | } | |
473 | if (error) { | |
474 | m_freem(*mp); | |
475 | *mp = (struct mbuf *)0; | |
476 | } | |
477 | /* | |
478 | * Search for any mbufs that are not a multiple of 4 bytes long. | |
479 | * These could cause pointer alignment problems, so copy them to | |
480 | * well aligned mbufs. | |
481 | */ | |
482 | m = *mp; | |
483 | mbp = mp; | |
484 | while (m) { | |
485 | /* | |
486 | * All this for something that may never happen. | |
487 | */ | |
488 | if (m->m_len & 0x3) { | |
489 | printf("nfs_rcv odd length!\n"); | |
490 | fcp = mtod(m, caddr_t); | |
491 | mnew = m2 = (struct mbuf *)0; | |
d4e5799e KM |
492 | #ifdef lint |
493 | m3 = (struct mbuf *)0; | |
494 | mlen = 0; | |
495 | #endif /* lint */ | |
f0f1cbaa KM |
496 | while (m) { |
497 | if (m2 == NULL || mlen == 0) { | |
498 | MGET(m2, M_WAIT, MT_DATA); | |
499 | if (len > MINCLSIZE) | |
500 | MCLGET(m2, M_WAIT); | |
501 | m2->m_len = 0; | |
502 | mlen = M_TRAILINGSPACE(m2); | |
503 | tcp = mtod(m2, caddr_t); | |
504 | if (mnew) { | |
505 | m3->m_next = m2; | |
506 | m3 = m2; | |
507 | } else | |
508 | mnew = m3 = m2; | |
509 | } | |
510 | siz = (mlen > m->m_len) ? m->m_len : mlen; | |
511 | bcopy(fcp, tcp, siz); | |
512 | m2->m_len += siz; | |
513 | mlen -= siz; | |
514 | len -= siz; | |
515 | tcp += siz; | |
516 | m->m_len -= siz; | |
517 | fcp += siz; | |
518 | if (m->m_len == 0) { | |
519 | do { | |
520 | m = m->m_next; | |
521 | } while (m && m->m_len == 0); | |
522 | if (m) | |
523 | fcp = mtod(m, caddr_t); | |
524 | } | |
525 | } | |
526 | m = *mbp; | |
527 | *mbp = mnew; | |
528 | m_freem(m); | |
529 | break; | |
2f08b65a | 530 | } |
f0f1cbaa KM |
531 | len -= m->m_len; |
532 | mbp = &m->m_next; | |
533 | m = m->m_next; | |
a2907882 | 534 | } |
a2907882 KM |
535 | return (error); |
536 | } | |
537 | ||
a2907882 KM |
538 | struct rpc_replyhead { |
539 | u_long r_xid; | |
540 | u_long r_rep; | |
541 | }; | |
542 | ||
543 | /* | |
f0f1cbaa | 544 | * Implement receipt of reply on a socket. |
a2907882 KM |
545 | * We must search through the list of received datagrams matching them |
546 | * with outstanding requests using the xid, until ours is found. | |
547 | */ | |
f0f1cbaa KM |
548 | /* ARGSUSED */ |
549 | nfs_reply(nmp, myrep) | |
550 | struct nfsmount *nmp; | |
ffe6f482 | 551 | struct nfsreq *myrep; |
a2907882 KM |
552 | { |
553 | register struct mbuf *m; | |
554 | register struct nfsreq *rep; | |
f0f1cbaa | 555 | register int error = 0; |
a2907882 | 556 | struct rpc_replyhead replyh; |
f0f1cbaa KM |
557 | struct mbuf *mp, *nam; |
558 | char *cp; | |
559 | int cnt, xfer; | |
a2907882 KM |
560 | |
561 | /* | |
f0f1cbaa | 562 | * Loop around until we get our own reply |
a2907882 | 563 | */ |
f0f1cbaa KM |
564 | for (;;) { |
565 | /* | |
566 | * Lock against other receivers so that I don't get stuck in | |
567 | * sbwait() after someone else has received my reply for me. | |
568 | * Also necessary for connection based protocols to avoid | |
569 | * race conditions during a reconnect. | |
570 | */ | |
170bfd05 | 571 | nfs_solock(&nmp->nm_flag); |
f0f1cbaa KM |
572 | /* Already received, bye bye */ |
573 | if (myrep->r_mrep != NULL) { | |
574 | nfs_sounlock(&nmp->nm_flag); | |
575 | return (0); | |
576 | } | |
577 | /* | |
578 | * Get the next Rpc reply off the socket | |
579 | */ | |
580 | if (error = nfs_receive(nmp->nm_so, &nam, &mp, myrep)) { | |
581 | nfs_sounlock(&nmp->nm_flag); | |
a2907882 | 582 | |
f0f1cbaa KM |
583 | /* |
584 | * Ignore routing errors on connectionless protocols?? | |
585 | */ | |
586 | if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { | |
587 | nmp->nm_so->so_error = 0; | |
588 | continue; | |
a2907882 | 589 | } |
f0f1cbaa KM |
590 | |
591 | /* | |
592 | * Otherwise cleanup and return a fatal error. | |
593 | */ | |
594 | if (myrep->r_flags & R_TIMING) { | |
595 | myrep->r_flags &= ~R_TIMING; | |
596 | nmp->nm_rtt = -1; | |
a2907882 | 597 | } |
f0f1cbaa KM |
598 | if (myrep->r_flags & R_SENT) { |
599 | myrep->r_flags &= ~R_SENT; | |
600 | nmp->nm_sent--; | |
2f08b65a | 601 | } |
f0f1cbaa KM |
602 | return (error); |
603 | } | |
604 | ||
605 | /* | |
606 | * Get the xid and check that it is an rpc reply | |
607 | */ | |
608 | m = mp; | |
609 | if (m->m_len >= 2*NFSX_UNSIGNED) | |
610 | bcopy(mtod(m, caddr_t), (caddr_t)&replyh, | |
611 | 2*NFSX_UNSIGNED); | |
612 | else { | |
613 | cnt = 2*NFSX_UNSIGNED; | |
614 | cp = (caddr_t)&replyh; | |
615 | while (m && cnt > 0) { | |
616 | if (m->m_len > 0) { | |
617 | xfer = (m->m_len >= cnt) ? cnt : | |
618 | m->m_len; | |
619 | bcopy(mtod(m, caddr_t), cp, xfer); | |
620 | cnt -= xfer; | |
621 | cp += xfer; | |
622 | } | |
623 | if (cnt > 0) | |
624 | m = m->m_next; | |
2f08b65a | 625 | } |
f0f1cbaa KM |
626 | } |
627 | if (replyh.r_rep != rpc_reply || m == NULL) { | |
628 | nfsstats.rpcinvalid++; | |
629 | m_freem(mp); | |
630 | nfs_sounlock(&nmp->nm_flag); | |
631 | continue; | |
632 | } | |
633 | /* | |
634 | * Loop through the request list to match up the reply | |
635 | * Iff no match, just drop the datagram | |
636 | */ | |
637 | m = mp; | |
638 | rep = nfsreqh.r_next; | |
639 | while (rep != &nfsreqh) { | |
640 | if (rep->r_mrep == NULL && replyh.r_xid == rep->r_xid) { | |
641 | /* Found it.. */ | |
642 | rep->r_mrep = m; | |
643 | /* | |
644 | * Update timing | |
645 | */ | |
646 | if (rep->r_flags & R_TIMING) { | |
647 | nfs_updatetimer(rep->r_nmp); | |
648 | rep->r_flags &= ~R_TIMING; | |
649 | rep->r_nmp->nm_rtt = -1; | |
650 | } | |
651 | if (rep->r_flags & R_SENT) { | |
652 | rep->r_flags &= ~R_SENT; | |
653 | rep->r_nmp->nm_sent--; | |
654 | } | |
655 | break; | |
2f08b65a | 656 | } |
f0f1cbaa | 657 | rep = rep->r_next; |
a2907882 | 658 | } |
f0f1cbaa KM |
659 | nfs_sounlock(&nmp->nm_flag); |
660 | if (nam) | |
661 | m_freem(nam); | |
662 | /* | |
663 | * If not matched to a request, drop it. | |
664 | * If it's mine, get out. | |
665 | */ | |
666 | if (rep == &nfsreqh) { | |
667 | nfsstats.rpcunexpected++; | |
668 | m_freem(m); | |
669 | } else if (rep == myrep) | |
670 | return (0); | |
a2907882 | 671 | } |
a2907882 KM |
672 | } |
673 | ||
674 | /* | |
675 | * nfs_request - goes something like this | |
676 | * - fill in request struct | |
677 | * - links it into list | |
f0f1cbaa KM |
678 | * - calls nfs_send() for first transmit |
679 | * - calls nfs_receive() to get reply | |
a2907882 KM |
680 | * - break down rpc header and return with nfs reply pointed to |
681 | * by mrep or error | |
682 | * nb: always frees up mreq mbuf list | |
683 | */ | |
170bfd05 | 684 | nfs_request(vp, mreq, xid, procnum, procp, tryhard, mp, mrp, mdp, dposp) |
a2907882 KM |
685 | struct vnode *vp; |
686 | struct mbuf *mreq; | |
687 | u_long xid; | |
f0f1cbaa KM |
688 | int procnum; |
689 | struct proc *procp; | |
170bfd05 | 690 | int tryhard; |
a2907882 KM |
691 | struct mount *mp; |
692 | struct mbuf **mrp; | |
693 | struct mbuf **mdp; | |
694 | caddr_t *dposp; | |
695 | { | |
696 | register struct mbuf *m, *mrep; | |
697 | register struct nfsreq *rep; | |
698 | register u_long *p; | |
699 | register int len; | |
f0f1cbaa | 700 | struct nfsmount *nmp; |
a2907882 | 701 | struct mbuf *md; |
ffe6f482 | 702 | struct nfsreq *reph; |
a2907882 KM |
703 | caddr_t dpos; |
704 | char *cp2; | |
705 | int t1; | |
706 | int s; | |
f0f1cbaa | 707 | int error = 0; |
a2907882 | 708 | |
f0f1cbaa | 709 | nmp = VFSTONFS(mp); |
a2907882 KM |
710 | m = mreq; |
711 | MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); | |
712 | rep->r_xid = xid; | |
f0f1cbaa | 713 | rep->r_nmp = nmp; |
a2907882 | 714 | rep->r_vp = vp; |
f0f1cbaa | 715 | rep->r_procp = procp; |
170bfd05 KM |
716 | if ((nmp->nm_flag & NFSMNT_SOFT) || |
717 | ((nmp->nm_flag & NFSMNT_SPONGY) && !tryhard)) | |
f0f1cbaa | 718 | rep->r_retry = nmp->nm_retry; |
a2907882 | 719 | else |
2f08b65a KM |
720 | rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ |
721 | rep->r_flags = rep->r_rexmit = 0; | |
f0f1cbaa KM |
722 | /* |
723 | * Three cases: | |
724 | * - non-idempotent requests on SOCK_DGRAM use NFS_MINIDEMTIMEO | |
725 | * - idempotent requests on SOCK_DGRAM use 0 | |
726 | * - Reliable transports, NFS_RELIABLETIMEO | |
727 | * Timeouts are still done on reliable transports to ensure detection | |
170bfd05 | 728 | * of excessive connection delay. |
f0f1cbaa KM |
729 | */ |
730 | if (nmp->nm_sotype != SOCK_DGRAM) | |
731 | rep->r_timerinit = -NFS_RELIABLETIMEO; | |
732 | else if (nonidempotent[procnum]) | |
733 | rep->r_timerinit = -NFS_MINIDEMTIMEO; | |
734 | else | |
735 | rep->r_timerinit = 0; | |
736 | rep->r_timer = rep->r_timerinit; | |
a2907882 | 737 | rep->r_mrep = NULL; |
a2907882 KM |
738 | len = 0; |
739 | while (m) { | |
740 | len += m->m_len; | |
741 | m = m->m_next; | |
742 | } | |
f0f1cbaa KM |
743 | mreq->m_pkthdr.len = len; |
744 | mreq->m_pkthdr.rcvif = (struct ifnet *)0; | |
745 | /* | |
746 | * For non-atomic protocols, insert a Sun RPC Record Mark. | |
747 | */ | |
748 | if ((nmp->nm_soflags & PR_ATOMIC) == 0) { | |
749 | M_PREPEND(mreq, sizeof(u_long), M_WAIT); | |
750 | *mtod(mreq, u_long *) = htonl(0x80000000 | len); | |
751 | } | |
752 | rep->r_mreq = mreq; | |
a2907882 | 753 | |
2f08b65a KM |
754 | /* |
755 | * Do the client side RPC. | |
756 | */ | |
757 | nfsstats.rpcrequests++; | |
f0f1cbaa KM |
758 | /* |
759 | * Chain request into list of outstanding requests. Be sure | |
760 | * to put it LAST so timer finds oldest requests first. | |
761 | */ | |
a2907882 | 762 | s = splnet(); |
2f08b65a | 763 | reph = &nfsreqh; |
f0f1cbaa KM |
764 | reph->r_prev->r_next = rep; |
765 | rep->r_prev = reph->r_prev; | |
ffe6f482 KM |
766 | reph->r_prev = rep; |
767 | rep->r_next = reph; | |
2f08b65a KM |
768 | /* |
769 | * If backing off another request or avoiding congestion, don't | |
770 | * send this one now but let timer do it. If not timing a request, | |
771 | * do it now. | |
772 | */ | |
f0f1cbaa KM |
773 | if (nmp->nm_sent <= 0 || nmp->nm_sotype != SOCK_DGRAM || |
774 | (nmp->nm_currexmit == 0 && nmp->nm_sent < nmp->nm_window)) { | |
775 | nmp->nm_sent++; | |
776 | rep->r_flags |= R_SENT; | |
777 | if (nmp->nm_rtt == -1) { | |
778 | nmp->nm_rtt = 0; | |
779 | rep->r_flags |= R_TIMING; | |
780 | } | |
781 | splx(s); | |
782 | m = m_copym(mreq, 0, M_COPYALL, M_WAIT); | |
783 | if (nmp->nm_soflags & PR_CONNREQUIRED) | |
170bfd05 | 784 | nfs_solock(&nmp->nm_flag); |
f0f1cbaa KM |
785 | error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep); |
786 | if (nmp->nm_soflags & PR_CONNREQUIRED) | |
787 | nfs_sounlock(&nmp->nm_flag); | |
788 | if (error && NFSIGNORE_SOERROR(nmp->nm_soflags, error)) | |
789 | nmp->nm_so->so_error = error = 0; | |
790 | } else | |
2f08b65a | 791 | splx(s); |
a2907882 | 792 | |
2f08b65a KM |
793 | /* |
794 | * Wait for the reply from our send or the timer's. | |
795 | */ | |
f0f1cbaa KM |
796 | if (!error) |
797 | error = nfs_reply(nmp, rep); | |
a2907882 | 798 | |
2f08b65a KM |
799 | /* |
800 | * RPC done, unlink the request. | |
801 | */ | |
a2907882 KM |
802 | s = splnet(); |
803 | rep->r_prev->r_next = rep->r_next; | |
ffe6f482 | 804 | rep->r_next->r_prev = rep->r_prev; |
a2907882 | 805 | splx(s); |
f0f1cbaa KM |
806 | |
807 | /* | |
808 | * If there was a successful reply and a tprintf msg. | |
809 | * tprintf a response. | |
810 | */ | |
811 | if (!error && (rep->r_flags & R_TPRINTFMSG)) { | |
812 | if (rep->r_procp) | |
5580a343 | 813 | tprintf(rep->r_procp->p_session, |
f0f1cbaa KM |
814 | "Nfs server %s, is alive again\n", |
815 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); | |
816 | else | |
5580a343 | 817 | tprintf(NULL, "Nfs server %s, is alive again\n", |
f0f1cbaa KM |
818 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); |
819 | } | |
a2907882 KM |
820 | m_freem(rep->r_mreq); |
821 | mrep = md = rep->r_mrep; | |
822 | FREE((caddr_t)rep, M_NFSREQ); | |
823 | if (error) | |
824 | return (error); | |
825 | ||
826 | /* | |
827 | * break down the rpc header and check if ok | |
828 | */ | |
829 | dpos = mtod(md, caddr_t); | |
830 | nfsm_disect(p, u_long *, 5*NFSX_UNSIGNED); | |
831 | p += 2; | |
832 | if (*p++ == rpc_msgdenied) { | |
833 | if (*p == rpc_mismatch) | |
834 | error = EOPNOTSUPP; | |
835 | else | |
836 | error = EACCES; | |
837 | m_freem(mrep); | |
838 | return (error); | |
839 | } | |
840 | /* | |
841 | * skip over the auth_verf, someday we may want to cache auth_short's | |
842 | * for nfs_reqhead(), but for now just dump it | |
843 | */ | |
844 | if (*++p != 0) { | |
845 | len = nfsm_rndup(fxdr_unsigned(long, *p)); | |
846 | nfsm_adv(len); | |
847 | } | |
848 | nfsm_disect(p, u_long *, NFSX_UNSIGNED); | |
849 | /* 0 == ok */ | |
850 | if (*p == 0) { | |
851 | nfsm_disect(p, u_long *, NFSX_UNSIGNED); | |
852 | if (*p != 0) { | |
853 | error = fxdr_unsigned(int, *p); | |
854 | m_freem(mrep); | |
855 | return (error); | |
856 | } | |
857 | *mrp = mrep; | |
858 | *mdp = md; | |
859 | *dposp = dpos; | |
860 | return (0); | |
861 | } | |
862 | m_freem(mrep); | |
863 | return (EPROTONOSUPPORT); | |
864 | nfsmout: | |
865 | return (error); | |
866 | } | |
867 | ||
868 | /* | |
869 | * Get a request for the server main loop | |
870 | * - receive a request via. nfs_soreceive() | |
871 | * - verify it | |
872 | * - fill in the cred struct. | |
873 | */ | |
d4e5799e | 874 | nfs_getreq(so, prog, vers, maxproc, nam, mrp, mdp, dposp, retxid, procnum, cr, |
170bfd05 | 875 | msk, mtch) |
a2907882 KM |
876 | struct socket *so; |
877 | u_long prog; | |
878 | u_long vers; | |
879 | int maxproc; | |
880 | struct mbuf **nam; | |
881 | struct mbuf **mrp; | |
882 | struct mbuf **mdp; | |
883 | caddr_t *dposp; | |
884 | u_long *retxid; | |
d4e5799e | 885 | u_long *procnum; |
a2907882 | 886 | register struct ucred *cr; |
f0f1cbaa | 887 | struct mbuf *msk, *mtch; |
a2907882 KM |
888 | { |
889 | register int i; | |
0bd503ad KM |
890 | register u_long *p; |
891 | register long t1; | |
892 | caddr_t dpos, cp2; | |
893 | int error = 0; | |
894 | struct mbuf *mrep, *md; | |
895 | int len; | |
a2907882 | 896 | |
f0f1cbaa | 897 | if (so->so_proto->pr_flags & PR_CONNREQUIRED) { |
f0f1cbaa | 898 | error = nfs_receive(so, nam, &mrep, (struct nfsreq *)0); |
f0f1cbaa KM |
899 | } else { |
900 | mrep = (struct mbuf *)0; | |
901 | do { | |
902 | if (mrep) { | |
903 | m_freem(*nam); | |
904 | m_freem(mrep); | |
905 | } | |
906 | error = nfs_receive(so, nam, &mrep, (struct nfsreq *)0); | |
907 | } while (!error && nfs_badnam(*nam, msk, mtch)); | |
908 | } | |
909 | if (error) | |
a2907882 KM |
910 | return (error); |
911 | md = mrep; | |
912 | dpos = mtod(mrep, caddr_t); | |
913 | nfsm_disect(p, u_long *, 10*NFSX_UNSIGNED); | |
914 | *retxid = *p++; | |
915 | if (*p++ != rpc_call) { | |
916 | m_freem(mrep); | |
917 | return (ERPCMISMATCH); | |
918 | } | |
919 | if (*p++ != rpc_vers) { | |
920 | m_freem(mrep); | |
921 | return (ERPCMISMATCH); | |
922 | } | |
923 | if (*p++ != prog) { | |
924 | m_freem(mrep); | |
925 | return (EPROGUNAVAIL); | |
926 | } | |
927 | if (*p++ != vers) { | |
928 | m_freem(mrep); | |
929 | return (EPROGMISMATCH); | |
930 | } | |
d4e5799e KM |
931 | *procnum = fxdr_unsigned(u_long, *p++); |
932 | if (*procnum == NFSPROC_NULL) { | |
a2907882 KM |
933 | *mrp = mrep; |
934 | return (0); | |
935 | } | |
d4e5799e | 936 | if (*procnum > maxproc || *p++ != rpc_auth_unix) { |
a2907882 KM |
937 | m_freem(mrep); |
938 | return (EPROCUNAVAIL); | |
939 | } | |
f0f1cbaa KM |
940 | len = fxdr_unsigned(int, *p++); |
941 | if (len < 0 || len > RPCAUTH_MAXSIZ) { | |
942 | m_freem(mrep); | |
943 | return (EBADRPC); | |
944 | } | |
0bd503ad | 945 | len = fxdr_unsigned(int, *++p); |
f0f1cbaa KM |
946 | if (len < 0 || len > NFS_MAXNAMLEN) { |
947 | m_freem(mrep); | |
948 | return (EBADRPC); | |
949 | } | |
0bd503ad | 950 | nfsm_adv(nfsm_rndup(len)); |
a2907882 KM |
951 | nfsm_disect(p, u_long *, 3*NFSX_UNSIGNED); |
952 | cr->cr_uid = fxdr_unsigned(uid_t, *p++); | |
953 | cr->cr_gid = fxdr_unsigned(gid_t, *p++); | |
0bd503ad | 954 | len = fxdr_unsigned(int, *p); |
f0f1cbaa | 955 | if (len < 0 || len > RPCAUTH_UNIXGIDS) { |
a2907882 KM |
956 | m_freem(mrep); |
957 | return (EBADRPC); | |
958 | } | |
0bd503ad KM |
959 | nfsm_disect(p, u_long *, (len + 2)*NFSX_UNSIGNED); |
960 | for (i = 1; i <= len; i++) | |
f0f1cbaa KM |
961 | if (i < NGROUPS) |
962 | cr->cr_groups[i] = fxdr_unsigned(gid_t, *p++); | |
963 | else | |
964 | p++; | |
965 | cr->cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); | |
a2907882 KM |
966 | /* |
967 | * Do we have any use for the verifier. | |
968 | * According to the "Remote Procedure Call Protocol Spec." it | |
969 | * should be AUTH_NULL, but some clients make it AUTH_UNIX? | |
970 | * For now, just skip over it | |
971 | */ | |
0bd503ad | 972 | len = fxdr_unsigned(int, *++p); |
f0f1cbaa KM |
973 | if (len < 0 || len > RPCAUTH_MAXSIZ) { |
974 | m_freem(mrep); | |
975 | return (EBADRPC); | |
976 | } | |
0bd503ad KM |
977 | if (len > 0) |
978 | nfsm_adv(nfsm_rndup(len)); | |
a2907882 KM |
979 | *mrp = mrep; |
980 | *mdp = md; | |
981 | *dposp = dpos; | |
982 | return (0); | |
983 | nfsmout: | |
984 | return (error); | |
985 | } | |
986 | ||
987 | /* | |
988 | * Generate the rpc reply header | |
989 | * siz arg. is used to decide if adding a cluster is worthwhile | |
990 | */ | |
991 | nfs_rephead(siz, retxid, err, mrq, mbp, bposp) | |
992 | int siz; | |
993 | u_long retxid; | |
994 | int err; | |
995 | struct mbuf **mrq; | |
996 | struct mbuf **mbp; | |
997 | caddr_t *bposp; | |
998 | { | |
0bd503ad KM |
999 | register u_long *p; |
1000 | register long t1; | |
1001 | caddr_t bpos; | |
1002 | struct mbuf *mreq, *mb, *mb2; | |
a2907882 KM |
1003 | |
1004 | NFSMGETHDR(mreq); | |
1005 | mb = mreq; | |
1006 | if ((siz+RPC_REPLYSIZ) > MHLEN) | |
f0f1cbaa | 1007 | MCLGET(mreq, M_WAIT); |
a2907882 KM |
1008 | p = mtod(mreq, u_long *); |
1009 | mreq->m_len = 6*NFSX_UNSIGNED; | |
1010 | bpos = ((caddr_t)p)+mreq->m_len; | |
1011 | *p++ = retxid; | |
1012 | *p++ = rpc_reply; | |
1013 | if (err == ERPCMISMATCH) { | |
1014 | *p++ = rpc_msgdenied; | |
1015 | *p++ = rpc_mismatch; | |
1016 | *p++ = txdr_unsigned(2); | |
1017 | *p = txdr_unsigned(2); | |
1018 | } else { | |
1019 | *p++ = rpc_msgaccepted; | |
1020 | *p++ = 0; | |
1021 | *p++ = 0; | |
1022 | switch (err) { | |
1023 | case EPROGUNAVAIL: | |
1024 | *p = txdr_unsigned(RPC_PROGUNAVAIL); | |
1025 | break; | |
1026 | case EPROGMISMATCH: | |
1027 | *p = txdr_unsigned(RPC_PROGMISMATCH); | |
1028 | nfsm_build(p, u_long *, 2*NFSX_UNSIGNED); | |
1029 | *p++ = txdr_unsigned(2); | |
1030 | *p = txdr_unsigned(2); /* someday 3 */ | |
1031 | break; | |
1032 | case EPROCUNAVAIL: | |
1033 | *p = txdr_unsigned(RPC_PROCUNAVAIL); | |
1034 | break; | |
1035 | default: | |
1036 | *p = 0; | |
1037 | if (err != VNOVAL) { | |
1038 | nfsm_build(p, u_long *, NFSX_UNSIGNED); | |
1039 | *p = txdr_unsigned(err); | |
1040 | } | |
1041 | break; | |
1042 | }; | |
1043 | } | |
1044 | *mrq = mreq; | |
1045 | *mbp = mb; | |
1046 | *bposp = bpos; | |
1047 | if (err != 0 && err != VNOVAL) | |
1048 | nfsstats.srvrpc_errs++; | |
1049 | return (0); | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Nfs timer routine | |
1054 | * Scan the nfsreq list and retranmit any requests that have timed out | |
1055 | * To avoid retransmission attempts on STREAM sockets (in the future) make | |
2f08b65a | 1056 | * sure to set the r_retry field to 0 (implies nm_retry == 0). |
a2907882 KM |
1057 | */ |
1058 | nfs_timer() | |
1059 | { | |
1060 | register struct nfsreq *rep; | |
1061 | register struct mbuf *m; | |
1062 | register struct socket *so; | |
f0f1cbaa | 1063 | register struct nfsmount *nmp; |
2f08b65a | 1064 | int s, error; |
a2907882 KM |
1065 | |
1066 | s = splnet(); | |
f0f1cbaa KM |
1067 | for (rep = nfsreqh.r_next; rep != &nfsreqh; rep = rep->r_next) { |
1068 | nmp = rep->r_nmp; | |
1069 | if (rep->r_mrep || (rep->r_flags & R_SOFTTERM) || | |
1070 | (so = nmp->nm_so) == NULL) | |
1071 | continue; | |
1072 | if ((nmp->nm_flag & NFSMNT_INT) && nfs_sigintr(rep->r_procp)) { | |
1073 | rep->r_flags |= R_SOFTTERM; | |
1074 | continue; | |
1075 | } | |
2f08b65a | 1076 | if (rep->r_flags & R_TIMING) /* update rtt in mount */ |
f0f1cbaa | 1077 | nmp->nm_rtt++; |
f0f1cbaa KM |
1078 | /* If not timed out */ |
1079 | if (++rep->r_timer < nmp->nm_rto) | |
2f08b65a KM |
1080 | continue; |
1081 | /* Do backoff and save new timeout in mount */ | |
1082 | if (rep->r_flags & R_TIMING) { | |
f0f1cbaa | 1083 | nfs_backofftimer(nmp); |
2f08b65a | 1084 | rep->r_flags &= ~R_TIMING; |
f0f1cbaa | 1085 | nmp->nm_rtt = -1; |
2f08b65a KM |
1086 | } |
1087 | if (rep->r_flags & R_SENT) { | |
1088 | rep->r_flags &= ~R_SENT; | |
f0f1cbaa | 1089 | nmp->nm_sent--; |
2f08b65a | 1090 | } |
f0f1cbaa KM |
1091 | |
1092 | /* | |
1093 | * Check for too many retries on soft mount. | |
1094 | * nb: For hard mounts, r_retry == NFS_MAXREXMIT+1 | |
1095 | */ | |
1096 | if (++rep->r_rexmit > NFS_MAXREXMIT) | |
2f08b65a | 1097 | rep->r_rexmit = NFS_MAXREXMIT; |
2f08b65a | 1098 | |
f0f1cbaa KM |
1099 | /* |
1100 | * Check for server not responding | |
1101 | */ | |
1102 | if ((rep->r_flags & R_TPRINTFMSG) == 0 && | |
170bfd05 | 1103 | rep->r_rexmit > NFS_FISHY) { |
f0f1cbaa | 1104 | if (rep->r_procp && rep->r_procp->p_session) |
5580a343 | 1105 | tprintf(rep->r_procp->p_session, |
f0f1cbaa KM |
1106 | "Nfs server %s, not responding\n", |
1107 | nmp->nm_mountp->mnt_stat.f_mntfromname); | |
1108 | else | |
5580a343 | 1109 | tprintf(NULL, |
f0f1cbaa KM |
1110 | "Nfs server %s, not responding\n", |
1111 | nmp->nm_mountp->mnt_stat.f_mntfromname); | |
1112 | rep->r_flags |= R_TPRINTFMSG; | |
1113 | } | |
170bfd05 | 1114 | if (rep->r_rexmit >= rep->r_retry) { /* too many */ |
f0f1cbaa KM |
1115 | nfsstats.rpctimeouts++; |
1116 | rep->r_flags |= R_SOFTTERM; | |
1117 | continue; | |
1118 | } | |
170bfd05 KM |
1119 | if (nmp->nm_sotype != SOCK_DGRAM) |
1120 | continue; | |
f0f1cbaa KM |
1121 | |
1122 | /* | |
1123 | * If there is enough space and the window allows.. | |
1124 | * Resend it | |
1125 | */ | |
1126 | if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && | |
1127 | nmp->nm_sent < nmp->nm_window && | |
1128 | (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ | |
1129 | nfsstats.rpcretries++; | |
1130 | if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) | |
1131 | error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, | |
1132 | (caddr_t)0, (struct mbuf *)0, (struct mbuf *)0); | |
1133 | else | |
1134 | error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, | |
1135 | nmp->nm_nam, (struct mbuf *)0, (struct mbuf *)0); | |
1136 | if (error) { | |
1137 | if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) | |
1138 | so->so_error = 0; | |
1139 | } else { | |
1140 | /* | |
1141 | * We need to time the request even though we | |
1142 | * are retransmitting. | |
1143 | */ | |
1144 | nmp->nm_rtt = 0; | |
1145 | nmp->nm_sent++; | |
1146 | rep->r_flags |= (R_SENT|R_TIMING); | |
1147 | rep->r_timer = rep->r_timerinit; | |
1148 | } | |
1149 | } | |
2f08b65a KM |
1150 | } |
1151 | splx(s); | |
1152 | timeout(nfs_timer, (caddr_t)0, hz/NFS_HZ); | |
1153 | } | |
1154 | ||
1155 | /* | |
1156 | * NFS timer update and backoff. The "Jacobson/Karels/Karn" scheme is | |
1157 | * used here. The timer state is held in the nfsmount structure and | |
1158 | * a single request is used to clock the response. When successful | |
1159 | * the rtt smoothing in nfs_updatetimer is used, when failed the backoff | |
1160 | * is done by nfs_backofftimer. We also log failure messages in these | |
1161 | * routines. | |
1162 | * | |
1163 | * Congestion variables are held in the nfshost structure which | |
1164 | * is referenced by nfsmounts and shared per-server. This separation | |
1165 | * makes it possible to do per-mount timing which allows varying disk | |
1166 | * access times to be dealt with, while preserving a network oriented | |
1167 | * congestion control scheme. | |
1168 | * | |
1169 | * The windowing implements the Jacobson/Karels slowstart algorithm | |
1170 | * with adjusted scaling factors. We start with one request, then send | |
1171 | * 4 more after each success until the ssthresh limit is reached, then | |
1172 | * we increment at a rate proportional to the window. On failure, we | |
1173 | * remember 3/4 the current window and clamp the send limit to 1. Note | |
1174 | * ICMP source quench is not reflected in so->so_error so we ignore that | |
1175 | * for now. | |
1176 | * | |
1177 | * NFS behaves much more like a transport protocol with these changes, | |
1178 | * shedding the teenage pedal-to-the-metal tendencies of "other" | |
1179 | * implementations. | |
1180 | * | |
1181 | * Timers and congestion avoidance by Tom Talpey, Open Software Foundation. | |
1182 | */ | |
1183 | ||
1184 | /* | |
1185 | * The TCP algorithm was not forgiving enough. Because the NFS server | |
1186 | * responds only after performing lookups/diskio/etc, we have to be | |
1187 | * more prepared to accept a spiky variance. The TCP algorithm is: | |
f0f1cbaa | 1188 | * TCP_RTO(nmp) ((((nmp)->nm_srtt >> 2) + (nmp)->nm_rttvar) >> 1) |
2f08b65a | 1189 | */ |
f0f1cbaa | 1190 | #define NFS_RTO(nmp) (((nmp)->nm_srtt >> 3) + (nmp)->nm_rttvar) |
2f08b65a | 1191 | |
f0f1cbaa KM |
1192 | nfs_updatetimer(nmp) |
1193 | register struct nfsmount *nmp; | |
2f08b65a | 1194 | { |
2f08b65a KM |
1195 | |
1196 | /* If retransmitted, clear and return */ | |
f0f1cbaa KM |
1197 | if (nmp->nm_rexmit || nmp->nm_currexmit) { |
1198 | nmp->nm_rexmit = nmp->nm_currexmit = 0; | |
2f08b65a KM |
1199 | return; |
1200 | } | |
1201 | /* If have a measurement, do smoothing */ | |
f0f1cbaa | 1202 | if (nmp->nm_srtt) { |
2f08b65a | 1203 | register short delta; |
f0f1cbaa KM |
1204 | delta = nmp->nm_rtt - (nmp->nm_srtt >> 3); |
1205 | if ((nmp->nm_srtt += delta) <= 0) | |
1206 | nmp->nm_srtt = 1; | |
2f08b65a KM |
1207 | if (delta < 0) |
1208 | delta = -delta; | |
f0f1cbaa KM |
1209 | delta -= (nmp->nm_rttvar >> 2); |
1210 | if ((nmp->nm_rttvar += delta) <= 0) | |
1211 | nmp->nm_rttvar = 1; | |
2f08b65a KM |
1212 | /* Else initialize */ |
1213 | } else { | |
f0f1cbaa KM |
1214 | nmp->nm_rttvar = nmp->nm_rtt << 1; |
1215 | if (nmp->nm_rttvar == 0) nmp->nm_rttvar = 2; | |
1216 | nmp->nm_srtt = nmp->nm_rttvar << 2; | |
2f08b65a KM |
1217 | } |
1218 | /* Compute new Retransmission TimeOut and clip */ | |
f0f1cbaa KM |
1219 | nmp->nm_rto = NFS_RTO(nmp); |
1220 | if (nmp->nm_rto < NFS_MINTIMEO) | |
1221 | nmp->nm_rto = NFS_MINTIMEO; | |
1222 | else if (nmp->nm_rto > NFS_MAXTIMEO) | |
1223 | nmp->nm_rto = NFS_MAXTIMEO; | |
2f08b65a KM |
1224 | |
1225 | /* Update window estimate */ | |
f0f1cbaa KM |
1226 | if (nmp->nm_window < nmp->nm_ssthresh) /* quickly */ |
1227 | nmp->nm_window += 4; | |
2f08b65a | 1228 | else { /* slowly */ |
f0f1cbaa KM |
1229 | register long incr = ++nmp->nm_winext; |
1230 | incr = (incr * incr) / nmp->nm_window; | |
2f08b65a | 1231 | if (incr > 0) { |
f0f1cbaa KM |
1232 | nmp->nm_winext = 0; |
1233 | ++nmp->nm_window; | |
2f08b65a KM |
1234 | } |
1235 | } | |
f0f1cbaa KM |
1236 | if (nmp->nm_window > NFS_MAXWINDOW) |
1237 | nmp->nm_window = NFS_MAXWINDOW; | |
2f08b65a KM |
1238 | } |
1239 | ||
f0f1cbaa KM |
1240 | nfs_backofftimer(nmp) |
1241 | register struct nfsmount *nmp; | |
2f08b65a | 1242 | { |
2f08b65a KM |
1243 | register unsigned long newrto; |
1244 | ||
1245 | /* Clip shift count */ | |
f0f1cbaa KM |
1246 | if (++nmp->nm_rexmit > 8 * sizeof nmp->nm_rto) |
1247 | nmp->nm_rexmit = 8 * sizeof nmp->nm_rto; | |
2f08b65a | 1248 | /* Back off RTO exponentially */ |
f0f1cbaa KM |
1249 | newrto = NFS_RTO(nmp); |
1250 | newrto <<= (nmp->nm_rexmit - 1); | |
2f08b65a KM |
1251 | if (newrto == 0 || newrto > NFS_MAXTIMEO) |
1252 | newrto = NFS_MAXTIMEO; | |
f0f1cbaa | 1253 | nmp->nm_rto = newrto; |
2f08b65a KM |
1254 | |
1255 | /* If too many retries, message, assume a bogus RTT and re-measure */ | |
f0f1cbaa KM |
1256 | if (nmp->nm_currexmit < nmp->nm_rexmit) { |
1257 | nmp->nm_currexmit = nmp->nm_rexmit; | |
1258 | if (nmp->nm_currexmit >= nfsrexmtthresh) { | |
1259 | if (nmp->nm_currexmit == nfsrexmtthresh) { | |
1260 | nmp->nm_rttvar += (nmp->nm_srtt >> 2); | |
1261 | nmp->nm_srtt = 0; | |
a2907882 KM |
1262 | } |
1263 | } | |
a2907882 | 1264 | } |
2f08b65a | 1265 | /* Close down window but remember this point (3/4 current) for later */ |
f0f1cbaa KM |
1266 | nmp->nm_ssthresh = ((nmp->nm_window << 1) + nmp->nm_window) >> 2; |
1267 | nmp->nm_window = 1; | |
1268 | nmp->nm_winext = 0; | |
a2907882 KM |
1269 | } |
1270 | ||
1271 | /* | |
f0f1cbaa KM |
1272 | * Test for a termination signal pending on procp. |
1273 | * This is used for NFSMNT_INT mounts. | |
a2907882 | 1274 | */ |
f0f1cbaa KM |
1275 | nfs_sigintr(p) |
1276 | register struct proc *p; | |
1277 | { | |
1278 | if (p && p->p_sig && (((p->p_sig &~ p->p_sigmask) &~ p->p_sigignore) & | |
1279 | NFSINT_SIGMASK)) | |
1280 | return (1); | |
1281 | else | |
1282 | return (0); | |
1283 | } | |
2f08b65a | 1284 | |
f0f1cbaa KM |
1285 | /* |
1286 | * Lock a socket against others. | |
1287 | * Necessary for STREAM sockets to ensure you get an entire rpc request/reply | |
1288 | * and also to avoid race conditions between the processes with nfs requests | |
1289 | * in progress when a reconnect is necessary. | |
1290 | */ | |
170bfd05 KM |
1291 | nfs_solock(flagp) |
1292 | register int *flagp; | |
a2907882 | 1293 | { |
2f08b65a | 1294 | |
f0f1cbaa KM |
1295 | while (*flagp & NFSMNT_SCKLOCK) { |
1296 | *flagp |= NFSMNT_WANTSCK; | |
170bfd05 | 1297 | (void) tsleep((caddr_t)flagp, PZERO-1, "nfsolck", 0); |
2f08b65a | 1298 | } |
f0f1cbaa KM |
1299 | *flagp |= NFSMNT_SCKLOCK; |
1300 | } | |
2f08b65a | 1301 | |
f0f1cbaa KM |
1302 | /* |
1303 | * Unlock the stream socket for others. | |
1304 | */ | |
1305 | nfs_sounlock(flagp) | |
170bfd05 | 1306 | register int *flagp; |
f0f1cbaa KM |
1307 | { |
1308 | ||
1309 | if ((*flagp & NFSMNT_SCKLOCK) == 0) | |
1310 | panic("nfs sounlock"); | |
1311 | *flagp &= ~NFSMNT_SCKLOCK; | |
1312 | if (*flagp & NFSMNT_WANTSCK) { | |
1313 | *flagp &= ~NFSMNT_WANTSCK; | |
1314 | wakeup((caddr_t)flagp); | |
2f08b65a | 1315 | } |
f0f1cbaa KM |
1316 | } |
1317 | ||
1318 | /* | |
1319 | * This function compares two net addresses by family and returns TRUE | |
1320 | * if they are the same. | |
1321 | * If there is any doubt, return FALSE. | |
1322 | */ | |
1323 | nfs_netaddr_match(nam1, nam2) | |
1324 | struct mbuf *nam1, *nam2; | |
1325 | { | |
1326 | register struct sockaddr *saddr1, *saddr2; | |
1327 | ||
1328 | saddr1 = mtod(nam1, struct sockaddr *); | |
1329 | saddr2 = mtod(nam2, struct sockaddr *); | |
1330 | if (saddr1->sa_family != saddr2->sa_family) | |
1331 | return (0); | |
1332 | ||
1333 | /* | |
1334 | * Must do each address family separately since unused fields | |
1335 | * are undefined values and not always zeroed. | |
1336 | */ | |
1337 | switch (saddr1->sa_family) { | |
1338 | case AF_INET: | |
1339 | if (((struct sockaddr_in *)saddr1)->sin_addr.s_addr == | |
1340 | ((struct sockaddr_in *)saddr2)->sin_addr.s_addr) | |
1341 | return (1); | |
1342 | break; | |
1343 | default: | |
1344 | break; | |
1345 | }; | |
1346 | return (0); | |
1347 | } | |
1348 | ||
1349 | /* | |
1350 | * Check the hostname fields for nfsd's mask and match fields. | |
1351 | * By address family: | |
1352 | * - Bitwise AND the mask with the host address field | |
1353 | * - Compare for == with match | |
1354 | * return TRUE if not equal | |
1355 | */ | |
1356 | nfs_badnam(nam, msk, mtch) | |
1357 | register struct mbuf *nam, *msk, *mtch; | |
1358 | { | |
1359 | switch (mtod(nam, struct sockaddr *)->sa_family) { | |
1360 | case AF_INET: | |
1361 | return ((mtod(nam, struct sockaddr_in *)->sin_addr.s_addr & | |
1362 | mtod(msk, struct sockaddr_in *)->sin_addr.s_addr) != | |
1363 | mtod(mtch, struct sockaddr_in *)->sin_addr.s_addr); | |
1364 | default: | |
1365 | printf("nfs_badmatch, unknown sa_family\n"); | |
1366 | return (0); | |
1367 | }; | |
a2907882 | 1368 | } |