Commit | Line | Data |
---|---|---|
a2907882 | 1 | /* |
f777974b | 2 | * Copyright (c) 1989, 1991 The Regents of the University of California. |
a2907882 KM |
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 | * | |
dbf0c423 | 8 | * %sccs.include.redist.c% |
a2907882 | 9 | * |
3e005f29 | 10 | * @(#)nfs_socket.c 7.23 (Berkeley) %G% |
a2907882 KM |
11 | */ |
12 | ||
13 | /* | |
f0f1cbaa | 14 | * Socket operations for use by nfs |
a2907882 KM |
15 | */ |
16 | ||
a2907882 | 17 | #include "param.h" |
2f08b65a | 18 | #include "proc.h" |
a2907882 KM |
19 | #include "mount.h" |
20 | #include "kernel.h" | |
21 | #include "malloc.h" | |
22 | #include "mbuf.h" | |
206e686b | 23 | #include "namei.h" |
a2907882 KM |
24 | #include "vnode.h" |
25 | #include "domain.h" | |
26 | #include "protosw.h" | |
27 | #include "socket.h" | |
28 | #include "socketvar.h" | |
f777974b | 29 | #include "syslog.h" |
79993818 | 30 | #include "tprintf.h" |
37ced908 KM |
31 | #include "../netinet/in.h" |
32 | #include "../netinet/tcp.h" | |
f777974b | 33 | |
a2907882 KM |
34 | #include "rpcv2.h" |
35 | #include "nfsv2.h" | |
36 | #include "nfs.h" | |
37 | #include "xdr_subs.h" | |
38 | #include "nfsm_subs.h" | |
39 | #include "nfsmount.h" | |
40 | ||
41 | #define TRUE 1 | |
170bfd05 | 42 | #define FALSE 0 |
a2907882 | 43 | |
a2907882 KM |
44 | /* |
45 | * External data, mostly RPC constants in XDR form | |
46 | */ | |
47 | extern u_long rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, rpc_auth_unix, | |
48 | rpc_msgaccepted, rpc_call; | |
49 | extern u_long nfs_prog, nfs_vers; | |
170bfd05 | 50 | /* Maybe these should be bits in a u_long ?? */ |
f0f1cbaa | 51 | extern int nonidempotent[NFS_NPROCS]; |
958df9fb KM |
52 | static int compressrequest[NFS_NPROCS] = { |
53 | FALSE, | |
54 | TRUE, | |
55 | TRUE, | |
56 | FALSE, | |
57 | TRUE, | |
58 | TRUE, | |
59 | TRUE, | |
60 | FALSE, | |
61 | FALSE, | |
62 | TRUE, | |
63 | TRUE, | |
64 | TRUE, | |
65 | TRUE, | |
66 | TRUE, | |
67 | TRUE, | |
68 | TRUE, | |
69 | TRUE, | |
70 | TRUE, | |
71 | }; | |
f0f1cbaa KM |
72 | int nfs_sbwait(); |
73 | void nfs_disconnect(); | |
958df9fb | 74 | struct mbuf *nfs_compress(), *nfs_uncompress(); |
f0f1cbaa | 75 | |
a2907882 KM |
76 | int nfsrv_null(), |
77 | nfsrv_getattr(), | |
78 | nfsrv_setattr(), | |
79 | nfsrv_lookup(), | |
80 | nfsrv_readlink(), | |
81 | nfsrv_read(), | |
82 | nfsrv_write(), | |
83 | nfsrv_create(), | |
84 | nfsrv_remove(), | |
85 | nfsrv_rename(), | |
86 | nfsrv_link(), | |
87 | nfsrv_symlink(), | |
88 | nfsrv_mkdir(), | |
89 | nfsrv_rmdir(), | |
90 | nfsrv_readdir(), | |
91 | nfsrv_statfs(), | |
92 | nfsrv_noop(); | |
93 | ||
94 | int (*nfsrv_procs[NFS_NPROCS])() = { | |
95 | nfsrv_null, | |
96 | nfsrv_getattr, | |
97 | nfsrv_setattr, | |
98 | nfsrv_noop, | |
99 | nfsrv_lookup, | |
100 | nfsrv_readlink, | |
101 | nfsrv_read, | |
102 | nfsrv_noop, | |
103 | nfsrv_write, | |
104 | nfsrv_create, | |
105 | nfsrv_remove, | |
106 | nfsrv_rename, | |
107 | nfsrv_link, | |
108 | nfsrv_symlink, | |
109 | nfsrv_mkdir, | |
110 | nfsrv_rmdir, | |
111 | nfsrv_readdir, | |
112 | nfsrv_statfs, | |
113 | }; | |
114 | ||
2f08b65a KM |
115 | struct nfsreq nfsreqh; |
116 | int nfsrexmtthresh = NFS_FISHY; | |
f0f1cbaa | 117 | int nfs_tcpnodelay = 1; |
2f08b65a KM |
118 | |
119 | /* | |
f0f1cbaa | 120 | * Initialize sockets and congestion for a new NFS connection. |
2f08b65a KM |
121 | * We do not free the sockaddr if error. |
122 | */ | |
f0f1cbaa | 123 | nfs_connect(nmp) |
2f08b65a | 124 | register struct nfsmount *nmp; |
2f08b65a | 125 | { |
f0f1cbaa | 126 | register struct socket *so; |
3e005f29 | 127 | int s, error, bufsize; |
2f08b65a | 128 | struct mbuf *m; |
2f08b65a | 129 | |
f0f1cbaa KM |
130 | nmp->nm_so = (struct socket *)0; |
131 | if (error = socreate(mtod(nmp->nm_nam, struct sockaddr *)->sa_family, | |
132 | &nmp->nm_so, nmp->nm_sotype, nmp->nm_soproto)) | |
2f08b65a | 133 | goto bad; |
f0f1cbaa KM |
134 | so = nmp->nm_so; |
135 | nmp->nm_soflags = so->so_proto->pr_flags; | |
2f08b65a | 136 | |
3e005f29 MK |
137 | if (nmp->nm_sotype == SOCK_DGRAM) |
138 | bufsize = min(4 * (nmp->nm_wsize + NFS_MAXPKTHDR), | |
139 | NFS_MAXPACKET); | |
140 | else | |
141 | bufsize = min(4 * (nmp->nm_wsize + NFS_MAXPKTHDR + sizeof(u_long)), | |
142 | NFS_MAXPACKET + sizeof(u_long)); | |
143 | if (error = soreserve(so, bufsize, bufsize)) | |
144 | goto bad; | |
145 | ||
f0f1cbaa KM |
146 | /* |
147 | * Protocols that do not require connections may be optionally left | |
148 | * unconnected for servers that reply from a port other than NFS_PORT. | |
149 | */ | |
150 | if (nmp->nm_flag & NFSMNT_NOCONN) { | |
151 | if (nmp->nm_soflags & PR_CONNREQUIRED) { | |
152 | error = ENOTCONN; | |
2f08b65a KM |
153 | goto bad; |
154 | } | |
f0f1cbaa KM |
155 | } else { |
156 | if (error = soconnect(so, nmp->nm_nam)) | |
2f08b65a | 157 | goto bad; |
f0f1cbaa KM |
158 | |
159 | /* | |
160 | * Wait for the connection to complete. Cribbed from the | |
161 | * connect system call but with the wait at negative prio. | |
162 | */ | |
163 | s = splnet(); | |
164 | while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) | |
170bfd05 | 165 | (void) tsleep((caddr_t)&so->so_timeo, PSOCK, "nfscon", 0); |
f0f1cbaa KM |
166 | splx(s); |
167 | if (so->so_error) { | |
168 | error = so->so_error; | |
169 | goto bad; | |
170 | } | |
2f08b65a | 171 | } |
f0f1cbaa | 172 | if (nmp->nm_sotype == SOCK_DGRAM) { |
170bfd05 | 173 | if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_SPONGY | NFSMNT_INT)) { |
f0f1cbaa KM |
174 | so->so_rcv.sb_timeo = (5 * hz); |
175 | so->so_snd.sb_timeo = (5 * hz); | |
176 | } else { | |
177 | so->so_rcv.sb_timeo = 0; | |
178 | so->so_snd.sb_timeo = 0; | |
179 | } | |
3e005f29 | 180 | nmp->nm_rto = NFS_TIMEO; |
f0f1cbaa | 181 | } else { |
170bfd05 | 182 | if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_SPONGY | NFSMNT_INT)) { |
f0f1cbaa KM |
183 | so->so_rcv.sb_timeo = (5 * hz); |
184 | so->so_snd.sb_timeo = (5 * hz); | |
185 | } else { | |
186 | so->so_rcv.sb_timeo = 0; | |
187 | so->so_snd.sb_timeo = 0; | |
188 | } | |
189 | if (so->so_proto->pr_flags & PR_CONNREQUIRED) { | |
190 | MGET(m, M_WAIT, MT_SOOPTS); | |
191 | *mtod(m, int *) = 1; | |
192 | m->m_len = sizeof(int); | |
193 | sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); | |
194 | } | |
195 | if (so->so_proto->pr_domain->dom_family == AF_INET && | |
196 | so->so_proto->pr_protocol == IPPROTO_TCP && | |
197 | nfs_tcpnodelay) { | |
198 | MGET(m, M_WAIT, MT_SOOPTS); | |
199 | *mtod(m, int *) = 1; | |
200 | m->m_len = sizeof(int); | |
201 | sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); | |
202 | } | |
3e005f29 | 203 | nmp->nm_rto = 10 * NFS_TIMEO; /* XXX */ |
f0f1cbaa KM |
204 | } |
205 | so->so_rcv.sb_flags |= SB_NOINTR; | |
206 | so->so_snd.sb_flags |= SB_NOINTR; | |
2f08b65a | 207 | |
f0f1cbaa | 208 | /* Initialize other non-zero congestion variables */ |
3e005f29 MK |
209 | nmp->nm_window = 2; /* Initial send window */ |
210 | nmp->nm_ssthresh = NFS_MAXWINDOW; /* Slowstart threshold */ | |
f0f1cbaa KM |
211 | nmp->nm_rttvar = nmp->nm_rto << 1; |
212 | nmp->nm_sent = 0; | |
213 | nmp->nm_currexmit = 0; | |
214 | return (0); | |
2f08b65a | 215 | |
f0f1cbaa KM |
216 | bad: |
217 | nfs_disconnect(nmp); | |
218 | return (error); | |
219 | } | |
2f08b65a | 220 | |
f0f1cbaa KM |
221 | /* |
222 | * Reconnect routine: | |
223 | * Called when a connection is broken on a reliable protocol. | |
224 | * - clean up the old socket | |
225 | * - nfs_connect() again | |
226 | * - set R_MUSTRESEND for all outstanding requests on mount point | |
227 | * If this fails the mount point is DEAD! | |
228 | * nb: Must be called with the nfs_solock() set on the mount point. | |
229 | */ | |
230 | nfs_reconnect(rep, nmp) | |
231 | register struct nfsreq *rep; | |
232 | register struct nfsmount *nmp; | |
233 | { | |
234 | register struct nfsreq *rp; | |
f0f1cbaa | 235 | int error; |
2f08b65a | 236 | |
79993818 MK |
237 | nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, |
238 | "trying reconnect"); | |
f0f1cbaa | 239 | while (error = nfs_connect(nmp)) { |
d4e5799e KM |
240 | #ifdef lint |
241 | error = error; | |
242 | #endif /* lint */ | |
f0f1cbaa KM |
243 | if ((nmp->nm_flag & NFSMNT_INT) && nfs_sigintr(rep->r_procp)) |
244 | return (EINTR); | |
170bfd05 | 245 | (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0); |
2f08b65a | 246 | } |
79993818 MK |
247 | nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, |
248 | "reconnected"); | |
f0f1cbaa KM |
249 | |
250 | /* | |
251 | * Loop through outstanding request list and fix up all requests | |
252 | * on old socket. | |
253 | */ | |
254 | rp = nfsreqh.r_next; | |
255 | while (rp != &nfsreqh) { | |
256 | if (rp->r_nmp == nmp) | |
257 | rp->r_flags |= R_MUSTRESEND; | |
258 | rp = rp->r_next; | |
2f08b65a KM |
259 | } |
260 | return (0); | |
2f08b65a KM |
261 | } |
262 | ||
263 | /* | |
264 | * NFS disconnect. Clean up and unlink. | |
265 | */ | |
f0f1cbaa | 266 | void |
2f08b65a KM |
267 | nfs_disconnect(nmp) |
268 | register struct nfsmount *nmp; | |
269 | { | |
f0f1cbaa | 270 | register struct socket *so; |
2f08b65a | 271 | |
f0f1cbaa KM |
272 | if (nmp->nm_so) { |
273 | so = nmp->nm_so; | |
274 | nmp->nm_so = (struct socket *)0; | |
275 | soshutdown(so, 2); | |
276 | soclose(so); | |
2f08b65a KM |
277 | } |
278 | } | |
a2907882 KM |
279 | |
280 | /* | |
f0f1cbaa KM |
281 | * This is the nfs send routine. For connection based socket types, it |
282 | * must be called with an nfs_solock() on the socket. | |
283 | * "rep == NULL" indicates that it has been called from a server. | |
a2907882 | 284 | */ |
f0f1cbaa | 285 | nfs_send(so, nam, top, rep) |
a2907882 KM |
286 | register struct socket *so; |
287 | struct mbuf *nam; | |
f0f1cbaa KM |
288 | register struct mbuf *top; |
289 | struct nfsreq *rep; | |
a2907882 | 290 | { |
f0f1cbaa KM |
291 | struct mbuf *sendnam; |
292 | int error, soflags; | |
a2907882 | 293 | |
f0f1cbaa KM |
294 | if (rep) { |
295 | if (rep->r_flags & R_SOFTTERM) { | |
2f08b65a | 296 | m_freem(top); |
f0f1cbaa | 297 | return (EINTR); |
2f08b65a | 298 | } |
5044b7a3 | 299 | if (rep->r_nmp->nm_so == NULL && |
f0f1cbaa KM |
300 | (error = nfs_reconnect(rep, rep->r_nmp))) |
301 | return (error); | |
302 | rep->r_flags &= ~R_MUSTRESEND; | |
5044b7a3 | 303 | so = rep->r_nmp->nm_so; |
f0f1cbaa KM |
304 | soflags = rep->r_nmp->nm_soflags; |
305 | } else | |
306 | soflags = so->so_proto->pr_flags; | |
307 | if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) | |
308 | sendnam = (struct mbuf *)0; | |
309 | else | |
310 | sendnam = nam; | |
311 | ||
312 | error = sosend(so, sendnam, (struct uio *)0, top, | |
313 | (struct mbuf *)0, 0); | |
314 | if (error == EWOULDBLOCK && rep) { | |
315 | if (rep->r_flags & R_SOFTTERM) | |
316 | error = EINTR; | |
317 | else { | |
318 | rep->r_flags |= R_MUSTRESEND; | |
319 | error = 0; | |
2f08b65a | 320 | } |
a2907882 | 321 | } |
f0f1cbaa KM |
322 | /* |
323 | * Ignore socket errors?? | |
324 | */ | |
325 | if (error && error != EINTR && error != ERESTART) | |
326 | error = 0; | |
a2907882 KM |
327 | return (error); |
328 | } | |
329 | ||
330 | /* | |
f0f1cbaa KM |
331 | * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all |
332 | * done by soreceive(), but for SOCK_STREAM we must deal with the Record | |
333 | * Mark and consolidate the data into a new mbuf list. | |
334 | * nb: Sometimes TCP passes the data up to soreceive() in long lists of | |
335 | * small mbufs. | |
336 | * For SOCK_STREAM we must be very careful to read an entire record once | |
337 | * we have read any of it, even if the system call has been interrupted. | |
a2907882 | 338 | */ |
f0f1cbaa | 339 | nfs_receive(so, aname, mp, rep) |
a2907882 KM |
340 | register struct socket *so; |
341 | struct mbuf **aname; | |
342 | struct mbuf **mp; | |
f0f1cbaa | 343 | register struct nfsreq *rep; |
a2907882 | 344 | { |
f0f1cbaa KM |
345 | struct uio auio; |
346 | struct iovec aio; | |
a2907882 | 347 | register struct mbuf *m; |
958df9fb | 348 | struct mbuf *m2, *mnew, **mbp; |
f0f1cbaa KM |
349 | caddr_t fcp, tcp; |
350 | u_long len; | |
351 | struct mbuf **getnam; | |
79993818 | 352 | int error, siz, mlen, soflags, rcvflg; |
a2907882 | 353 | |
f0f1cbaa KM |
354 | /* |
355 | * Set up arguments for soreceive() | |
356 | */ | |
357 | *mp = (struct mbuf *)0; | |
358 | *aname = (struct mbuf *)0; | |
359 | if (rep) | |
360 | soflags = rep->r_nmp->nm_soflags; | |
361 | else | |
362 | soflags = so->so_proto->pr_flags; | |
a2907882 | 363 | |
f0f1cbaa KM |
364 | /* |
365 | * For reliable protocols, lock against other senders/receivers | |
366 | * in case a reconnect is necessary. | |
367 | * For SOCK_STREAM, first get the Record Mark to find out how much | |
368 | * more there is to get. | |
369 | * We must lock the socket against other receivers | |
370 | * until we have an entire rpc request/reply. | |
371 | */ | |
372 | if (soflags & PR_CONNREQUIRED) { | |
373 | tryagain: | |
374 | /* | |
375 | * Check for fatal errors and resending request. | |
376 | */ | |
377 | if (rep) { | |
378 | /* | |
379 | * Ugh: If a reconnect attempt just happened, nm_so | |
380 | * would have changed. NULL indicates a failed | |
381 | * attempt that has essentially shut down this | |
382 | * mount point. | |
383 | */ | |
384 | if (rep->r_mrep || (so = rep->r_nmp->nm_so) == NULL || | |
385 | (rep->r_flags & R_SOFTTERM)) | |
386 | return (EINTR); | |
387 | while (rep->r_flags & R_MUSTRESEND) { | |
388 | m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); | |
389 | nfsstats.rpcretries++; | |
390 | if (error = nfs_send(so, rep->r_nmp->nm_nam, m, | |
391 | rep)) | |
392 | goto errout; | |
2f08b65a | 393 | } |
e8540f59 | 394 | } |
f0f1cbaa KM |
395 | if ((soflags & PR_ATOMIC) == 0) { |
396 | aio.iov_base = (caddr_t) &len; | |
397 | aio.iov_len = sizeof(u_long); | |
398 | auio.uio_iov = &aio; | |
399 | auio.uio_iovcnt = 1; | |
400 | auio.uio_segflg = UIO_SYSSPACE; | |
401 | auio.uio_rw = UIO_READ; | |
206e686b | 402 | auio.uio_procp = (struct proc *)0; |
f0f1cbaa KM |
403 | auio.uio_offset = 0; |
404 | auio.uio_resid = sizeof(u_long); | |
405 | do { | |
79993818 MK |
406 | rcvflg = MSG_WAITALL; |
407 | error = soreceive(so, (struct mbuf **)0, &auio, | |
f0f1cbaa | 408 | (struct mbuf **)0, (struct mbuf **)0, &rcvflg); |
79993818 | 409 | if (error == EWOULDBLOCK && rep) { |
f0f1cbaa KM |
410 | if (rep->r_flags & R_SOFTTERM) |
411 | return (EINTR); | |
412 | if (rep->r_flags & R_MUSTRESEND) | |
413 | goto tryagain; | |
79993818 | 414 | } |
f0f1cbaa | 415 | } while (error == EWOULDBLOCK); |
79993818 MK |
416 | if (!error && auio.uio_resid > 0) { |
417 | if (rep) | |
418 | log(LOG_INFO, | |
419 | "short receive (%d/%d) from nfs server %s\n", | |
420 | sizeof(u_long) - auio.uio_resid, | |
421 | sizeof(u_long), | |
422 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); | |
423 | error = EPIPE; | |
424 | } | |
f0f1cbaa KM |
425 | if (error) |
426 | goto errout; | |
427 | len = ntohl(len) & ~0x80000000; | |
428 | /* | |
429 | * This is SERIOUS! We are out of sync with the sender | |
430 | * and forcing a disconnect/reconnect is all I can do. | |
431 | */ | |
432 | if (len > NFS_MAXPACKET) { | |
79993818 MK |
433 | if (rep) |
434 | log(LOG_ERR, "%s (%d) from nfs server %s\n", | |
435 | "impossible packet length", | |
436 | len, | |
437 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); | |
438 | error = EFBIG; | |
439 | goto errout; | |
f0f1cbaa KM |
440 | } |
441 | auio.uio_resid = len; | |
442 | do { | |
79993818 | 443 | rcvflg = MSG_WAITALL; |
f0f1cbaa KM |
444 | error = soreceive(so, (struct mbuf **)0, |
445 | &auio, mp, (struct mbuf **)0, &rcvflg); | |
446 | } while (error == EWOULDBLOCK || error == EINTR || | |
447 | error == ERESTART); | |
79993818 MK |
448 | if (!error && auio.uio_resid > 0) { |
449 | if (rep) | |
450 | log(LOG_INFO, | |
451 | "short receive (%d/%d) from nfs server %s\n", | |
452 | len - auio.uio_resid, len, | |
453 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); | |
454 | error = EPIPE; | |
455 | } | |
2f08b65a | 456 | } else { |
f0f1cbaa KM |
457 | auio.uio_resid = len = 1000000; /* Anything Big */ |
458 | do { | |
79993818 | 459 | rcvflg = 0; |
f0f1cbaa KM |
460 | error = soreceive(so, (struct mbuf **)0, |
461 | &auio, mp, (struct mbuf **)0, &rcvflg); | |
462 | if (error == EWOULDBLOCK && rep) { | |
463 | if (rep->r_flags & R_SOFTTERM) | |
464 | return (EINTR); | |
465 | if (rep->r_flags & R_MUSTRESEND) | |
466 | goto tryagain; | |
467 | } | |
468 | } while (error == EWOULDBLOCK); | |
469 | if (!error && *mp == NULL) | |
470 | error = EPIPE; | |
471 | len -= auio.uio_resid; | |
2f08b65a | 472 | } |
f0f1cbaa KM |
473 | errout: |
474 | if (error && rep && error != EINTR && error != ERESTART) { | |
475 | m_freem(*mp); | |
476 | *mp = (struct mbuf *)0; | |
79993818 MK |
477 | if (error != EPIPE && rep) |
478 | log(LOG_INFO, | |
479 | "receive error %d from nfs server %s\n", | |
480 | error, | |
481 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); | |
f0f1cbaa KM |
482 | nfs_disconnect(rep->r_nmp); |
483 | error = nfs_reconnect(rep, rep->r_nmp); | |
484 | if (!error) | |
485 | goto tryagain; | |
2f08b65a | 486 | } |
f0f1cbaa KM |
487 | } else { |
488 | if (so->so_state & SS_ISCONNECTED) | |
489 | getnam = (struct mbuf **)0; | |
490 | else | |
491 | getnam = aname; | |
492 | auio.uio_resid = len = 1000000; | |
493 | do { | |
79993818 | 494 | rcvflg = 0; |
f0f1cbaa KM |
495 | error = soreceive(so, getnam, &auio, mp, |
496 | (struct mbuf **)0, &rcvflg); | |
497 | if (error == EWOULDBLOCK && rep && | |
498 | (rep->r_flags & R_SOFTTERM)) | |
499 | return (EINTR); | |
500 | } while (error == EWOULDBLOCK); | |
501 | len -= auio.uio_resid; | |
502 | } | |
503 | if (error) { | |
504 | m_freem(*mp); | |
505 | *mp = (struct mbuf *)0; | |
506 | } | |
507 | /* | |
508 | * Search for any mbufs that are not a multiple of 4 bytes long. | |
509 | * These could cause pointer alignment problems, so copy them to | |
510 | * well aligned mbufs. | |
511 | */ | |
512 | m = *mp; | |
513 | mbp = mp; | |
514 | while (m) { | |
515 | /* | |
516 | * All this for something that may never happen. | |
517 | */ | |
958df9fb | 518 | if (m->m_next && (m->m_len & 0x3)) { |
f0f1cbaa | 519 | printf("nfs_rcv odd length!\n"); |
d4e5799e | 520 | mlen = 0; |
f0f1cbaa | 521 | while (m) { |
958df9fb KM |
522 | fcp = mtod(m, caddr_t); |
523 | while (m->m_len > 0) { | |
524 | if (mlen == 0) { | |
525 | MGET(m2, M_WAIT, MT_DATA); | |
526 | if (len >= MINCLSIZE) | |
527 | MCLGET(m2, M_WAIT); | |
528 | m2->m_len = 0; | |
529 | mlen = M_TRAILINGSPACE(m2); | |
530 | tcp = mtod(m2, caddr_t); | |
531 | *mbp = m2; | |
532 | mbp = &m2->m_next; | |
533 | } | |
534 | siz = MIN(mlen, m->m_len); | |
535 | bcopy(fcp, tcp, siz); | |
536 | m2->m_len += siz; | |
537 | mlen -= siz; | |
538 | len -= siz; | |
539 | tcp += siz; | |
540 | m->m_len -= siz; | |
541 | fcp += siz; | |
f0f1cbaa | 542 | } |
958df9fb KM |
543 | MFREE(m, mnew); |
544 | m = mnew; | |
f0f1cbaa | 545 | } |
f0f1cbaa | 546 | break; |
2f08b65a | 547 | } |
f0f1cbaa KM |
548 | len -= m->m_len; |
549 | mbp = &m->m_next; | |
550 | m = m->m_next; | |
a2907882 | 551 | } |
a2907882 KM |
552 | return (error); |
553 | } | |
554 | ||
a2907882 | 555 | /* |
f0f1cbaa | 556 | * Implement receipt of reply on a socket. |
a2907882 KM |
557 | * We must search through the list of received datagrams matching them |
558 | * with outstanding requests using the xid, until ours is found. | |
559 | */ | |
f0f1cbaa KM |
560 | /* ARGSUSED */ |
561 | nfs_reply(nmp, myrep) | |
562 | struct nfsmount *nmp; | |
ffe6f482 | 563 | struct nfsreq *myrep; |
a2907882 KM |
564 | { |
565 | register struct mbuf *m; | |
566 | register struct nfsreq *rep; | |
f0f1cbaa | 567 | register int error = 0; |
958df9fb | 568 | u_long rxid; |
f0f1cbaa KM |
569 | struct mbuf *mp, *nam; |
570 | char *cp; | |
571 | int cnt, xfer; | |
a2907882 KM |
572 | |
573 | /* | |
f0f1cbaa | 574 | * Loop around until we get our own reply |
a2907882 | 575 | */ |
f0f1cbaa KM |
576 | for (;;) { |
577 | /* | |
578 | * Lock against other receivers so that I don't get stuck in | |
579 | * sbwait() after someone else has received my reply for me. | |
580 | * Also necessary for connection based protocols to avoid | |
581 | * race conditions during a reconnect. | |
582 | */ | |
170bfd05 | 583 | nfs_solock(&nmp->nm_flag); |
f0f1cbaa KM |
584 | /* Already received, bye bye */ |
585 | if (myrep->r_mrep != NULL) { | |
586 | nfs_sounlock(&nmp->nm_flag); | |
587 | return (0); | |
588 | } | |
589 | /* | |
590 | * Get the next Rpc reply off the socket | |
591 | */ | |
592 | if (error = nfs_receive(nmp->nm_so, &nam, &mp, myrep)) { | |
593 | nfs_sounlock(&nmp->nm_flag); | |
a2907882 | 594 | |
f0f1cbaa KM |
595 | /* |
596 | * Ignore routing errors on connectionless protocols?? | |
597 | */ | |
598 | if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { | |
599 | nmp->nm_so->so_error = 0; | |
600 | continue; | |
a2907882 | 601 | } |
f0f1cbaa KM |
602 | |
603 | /* | |
604 | * Otherwise cleanup and return a fatal error. | |
605 | */ | |
606 | if (myrep->r_flags & R_TIMING) { | |
607 | myrep->r_flags &= ~R_TIMING; | |
608 | nmp->nm_rtt = -1; | |
a2907882 | 609 | } |
f0f1cbaa KM |
610 | if (myrep->r_flags & R_SENT) { |
611 | myrep->r_flags &= ~R_SENT; | |
612 | nmp->nm_sent--; | |
2f08b65a | 613 | } |
f0f1cbaa KM |
614 | return (error); |
615 | } | |
616 | ||
617 | /* | |
618 | * Get the xid and check that it is an rpc reply | |
619 | */ | |
620 | m = mp; | |
958df9fb KM |
621 | while (m && m->m_len == 0) |
622 | m = m->m_next; | |
623 | if (m == NULL) { | |
f0f1cbaa KM |
624 | nfsstats.rpcinvalid++; |
625 | m_freem(mp); | |
626 | nfs_sounlock(&nmp->nm_flag); | |
627 | continue; | |
628 | } | |
958df9fb | 629 | bcopy(mtod(m, caddr_t), (caddr_t)&rxid, NFSX_UNSIGNED); |
f0f1cbaa KM |
630 | /* |
631 | * Loop through the request list to match up the reply | |
632 | * Iff no match, just drop the datagram | |
633 | */ | |
634 | m = mp; | |
635 | rep = nfsreqh.r_next; | |
636 | while (rep != &nfsreqh) { | |
958df9fb | 637 | if (rep->r_mrep == NULL && rxid == rep->r_xid) { |
f0f1cbaa KM |
638 | /* Found it.. */ |
639 | rep->r_mrep = m; | |
640 | /* | |
641 | * Update timing | |
642 | */ | |
643 | if (rep->r_flags & R_TIMING) { | |
644 | nfs_updatetimer(rep->r_nmp); | |
645 | rep->r_flags &= ~R_TIMING; | |
646 | rep->r_nmp->nm_rtt = -1; | |
647 | } | |
648 | if (rep->r_flags & R_SENT) { | |
649 | rep->r_flags &= ~R_SENT; | |
650 | rep->r_nmp->nm_sent--; | |
651 | } | |
652 | break; | |
2f08b65a | 653 | } |
f0f1cbaa | 654 | rep = rep->r_next; |
a2907882 | 655 | } |
f0f1cbaa KM |
656 | nfs_sounlock(&nmp->nm_flag); |
657 | if (nam) | |
658 | m_freem(nam); | |
659 | /* | |
660 | * If not matched to a request, drop it. | |
661 | * If it's mine, get out. | |
662 | */ | |
663 | if (rep == &nfsreqh) { | |
664 | nfsstats.rpcunexpected++; | |
665 | m_freem(m); | |
666 | } else if (rep == myrep) | |
667 | return (0); | |
a2907882 | 668 | } |
a2907882 KM |
669 | } |
670 | ||
671 | /* | |
672 | * nfs_request - goes something like this | |
673 | * - fill in request struct | |
674 | * - links it into list | |
f0f1cbaa KM |
675 | * - calls nfs_send() for first transmit |
676 | * - calls nfs_receive() to get reply | |
a2907882 KM |
677 | * - break down rpc header and return with nfs reply pointed to |
678 | * by mrep or error | |
679 | * nb: always frees up mreq mbuf list | |
680 | */ | |
170bfd05 | 681 | nfs_request(vp, mreq, xid, procnum, procp, tryhard, mp, mrp, mdp, dposp) |
a2907882 KM |
682 | struct vnode *vp; |
683 | struct mbuf *mreq; | |
684 | u_long xid; | |
f0f1cbaa KM |
685 | int procnum; |
686 | struct proc *procp; | |
170bfd05 | 687 | int tryhard; |
a2907882 KM |
688 | struct mount *mp; |
689 | struct mbuf **mrp; | |
690 | struct mbuf **mdp; | |
691 | caddr_t *dposp; | |
692 | { | |
693 | register struct mbuf *m, *mrep; | |
694 | register struct nfsreq *rep; | |
206e686b | 695 | register u_long *tl; |
a2907882 | 696 | register int len; |
f0f1cbaa | 697 | struct nfsmount *nmp; |
a2907882 | 698 | struct mbuf *md; |
ffe6f482 | 699 | struct nfsreq *reph; |
a2907882 KM |
700 | caddr_t dpos; |
701 | char *cp2; | |
702 | int t1; | |
958df9fb | 703 | int s, compressed; |
f0f1cbaa | 704 | int error = 0; |
a2907882 | 705 | |
f0f1cbaa | 706 | nmp = VFSTONFS(mp); |
a2907882 KM |
707 | m = mreq; |
708 | MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); | |
709 | rep->r_xid = xid; | |
f0f1cbaa | 710 | rep->r_nmp = nmp; |
a2907882 | 711 | rep->r_vp = vp; |
f0f1cbaa | 712 | rep->r_procp = procp; |
170bfd05 KM |
713 | if ((nmp->nm_flag & NFSMNT_SOFT) || |
714 | ((nmp->nm_flag & NFSMNT_SPONGY) && !tryhard)) | |
f0f1cbaa | 715 | rep->r_retry = nmp->nm_retry; |
a2907882 | 716 | else |
2f08b65a KM |
717 | rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ |
718 | rep->r_flags = rep->r_rexmit = 0; | |
f0f1cbaa KM |
719 | /* |
720 | * Three cases: | |
721 | * - non-idempotent requests on SOCK_DGRAM use NFS_MINIDEMTIMEO | |
722 | * - idempotent requests on SOCK_DGRAM use 0 | |
723 | * - Reliable transports, NFS_RELIABLETIMEO | |
724 | * Timeouts are still done on reliable transports to ensure detection | |
170bfd05 | 725 | * of excessive connection delay. |
f0f1cbaa KM |
726 | */ |
727 | if (nmp->nm_sotype != SOCK_DGRAM) | |
728 | rep->r_timerinit = -NFS_RELIABLETIMEO; | |
729 | else if (nonidempotent[procnum]) | |
730 | rep->r_timerinit = -NFS_MINIDEMTIMEO; | |
731 | else | |
732 | rep->r_timerinit = 0; | |
733 | rep->r_timer = rep->r_timerinit; | |
a2907882 | 734 | rep->r_mrep = NULL; |
a2907882 KM |
735 | len = 0; |
736 | while (m) { | |
737 | len += m->m_len; | |
738 | m = m->m_next; | |
739 | } | |
f0f1cbaa KM |
740 | mreq->m_pkthdr.len = len; |
741 | mreq->m_pkthdr.rcvif = (struct ifnet *)0; | |
958df9fb KM |
742 | compressed = 0; |
743 | m = mreq; | |
744 | if ((nmp->nm_flag & NFSMNT_COMPRESS) && compressrequest[procnum]) { | |
745 | mreq = nfs_compress(mreq); | |
746 | if (mreq != m) { | |
747 | len = mreq->m_pkthdr.len; | |
748 | compressed++; | |
749 | } | |
750 | } | |
f0f1cbaa KM |
751 | /* |
752 | * For non-atomic protocols, insert a Sun RPC Record Mark. | |
753 | */ | |
754 | if ((nmp->nm_soflags & PR_ATOMIC) == 0) { | |
755 | M_PREPEND(mreq, sizeof(u_long), M_WAIT); | |
756 | *mtod(mreq, u_long *) = htonl(0x80000000 | len); | |
757 | } | |
758 | rep->r_mreq = mreq; | |
a2907882 | 759 | |
2f08b65a KM |
760 | /* |
761 | * Do the client side RPC. | |
762 | */ | |
763 | nfsstats.rpcrequests++; | |
f0f1cbaa KM |
764 | /* |
765 | * Chain request into list of outstanding requests. Be sure | |
766 | * to put it LAST so timer finds oldest requests first. | |
767 | */ | |
a2907882 | 768 | s = splnet(); |
2f08b65a | 769 | reph = &nfsreqh; |
f0f1cbaa KM |
770 | reph->r_prev->r_next = rep; |
771 | rep->r_prev = reph->r_prev; | |
ffe6f482 KM |
772 | reph->r_prev = rep; |
773 | rep->r_next = reph; | |
2f08b65a KM |
774 | /* |
775 | * If backing off another request or avoiding congestion, don't | |
776 | * send this one now but let timer do it. If not timing a request, | |
777 | * do it now. | |
778 | */ | |
f0f1cbaa KM |
779 | if (nmp->nm_sent <= 0 || nmp->nm_sotype != SOCK_DGRAM || |
780 | (nmp->nm_currexmit == 0 && nmp->nm_sent < nmp->nm_window)) { | |
781 | nmp->nm_sent++; | |
782 | rep->r_flags |= R_SENT; | |
783 | if (nmp->nm_rtt == -1) { | |
784 | nmp->nm_rtt = 0; | |
785 | rep->r_flags |= R_TIMING; | |
786 | } | |
787 | splx(s); | |
788 | m = m_copym(mreq, 0, M_COPYALL, M_WAIT); | |
789 | if (nmp->nm_soflags & PR_CONNREQUIRED) | |
170bfd05 | 790 | nfs_solock(&nmp->nm_flag); |
f0f1cbaa KM |
791 | error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep); |
792 | if (nmp->nm_soflags & PR_CONNREQUIRED) | |
793 | nfs_sounlock(&nmp->nm_flag); | |
794 | if (error && NFSIGNORE_SOERROR(nmp->nm_soflags, error)) | |
795 | nmp->nm_so->so_error = error = 0; | |
796 | } else | |
2f08b65a | 797 | splx(s); |
a2907882 | 798 | |
2f08b65a KM |
799 | /* |
800 | * Wait for the reply from our send or the timer's. | |
801 | */ | |
f0f1cbaa KM |
802 | if (!error) |
803 | error = nfs_reply(nmp, rep); | |
a2907882 | 804 | |
2f08b65a KM |
805 | /* |
806 | * RPC done, unlink the request. | |
807 | */ | |
a2907882 KM |
808 | s = splnet(); |
809 | rep->r_prev->r_next = rep->r_next; | |
ffe6f482 | 810 | rep->r_next->r_prev = rep->r_prev; |
a2907882 | 811 | splx(s); |
f0f1cbaa KM |
812 | |
813 | /* | |
814 | * If there was a successful reply and a tprintf msg. | |
815 | * tprintf a response. | |
816 | */ | |
79993818 MK |
817 | if (!error && (rep->r_flags & R_TPRINTFMSG)) |
818 | nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, | |
819 | "is alive again"); | |
a2907882 | 820 | m_freem(rep->r_mreq); |
958df9fb | 821 | mrep = rep->r_mrep; |
a2907882 KM |
822 | FREE((caddr_t)rep, M_NFSREQ); |
823 | if (error) | |
824 | return (error); | |
825 | ||
958df9fb KM |
826 | if (compressed) |
827 | mrep = nfs_uncompress(mrep); | |
828 | md = mrep; | |
a2907882 KM |
829 | /* |
830 | * break down the rpc header and check if ok | |
831 | */ | |
832 | dpos = mtod(md, caddr_t); | |
206e686b KM |
833 | nfsm_disect(tl, u_long *, 5*NFSX_UNSIGNED); |
834 | tl += 2; | |
835 | if (*tl++ == rpc_msgdenied) { | |
836 | if (*tl == rpc_mismatch) | |
a2907882 KM |
837 | error = EOPNOTSUPP; |
838 | else | |
839 | error = EACCES; | |
840 | m_freem(mrep); | |
841 | return (error); | |
842 | } | |
843 | /* | |
844 | * skip over the auth_verf, someday we may want to cache auth_short's | |
845 | * for nfs_reqhead(), but for now just dump it | |
846 | */ | |
206e686b KM |
847 | if (*++tl != 0) { |
848 | len = nfsm_rndup(fxdr_unsigned(long, *tl)); | |
a2907882 KM |
849 | nfsm_adv(len); |
850 | } | |
206e686b | 851 | nfsm_disect(tl, u_long *, NFSX_UNSIGNED); |
a2907882 | 852 | /* 0 == ok */ |
206e686b KM |
853 | if (*tl == 0) { |
854 | nfsm_disect(tl, u_long *, NFSX_UNSIGNED); | |
855 | if (*tl != 0) { | |
856 | error = fxdr_unsigned(int, *tl); | |
a2907882 KM |
857 | m_freem(mrep); |
858 | return (error); | |
859 | } | |
860 | *mrp = mrep; | |
861 | *mdp = md; | |
862 | *dposp = dpos; | |
863 | return (0); | |
864 | } | |
865 | m_freem(mrep); | |
866 | return (EPROTONOSUPPORT); | |
867 | nfsmout: | |
868 | return (error); | |
869 | } | |
870 | ||
871 | /* | |
872 | * Get a request for the server main loop | |
873 | * - receive a request via. nfs_soreceive() | |
874 | * - verify it | |
875 | * - fill in the cred struct. | |
876 | */ | |
d4e5799e | 877 | nfs_getreq(so, prog, vers, maxproc, nam, mrp, mdp, dposp, retxid, procnum, cr, |
958df9fb | 878 | msk, mtch, wascomp) |
a2907882 KM |
879 | struct socket *so; |
880 | u_long prog; | |
881 | u_long vers; | |
882 | int maxproc; | |
883 | struct mbuf **nam; | |
884 | struct mbuf **mrp; | |
885 | struct mbuf **mdp; | |
886 | caddr_t *dposp; | |
887 | u_long *retxid; | |
d4e5799e | 888 | u_long *procnum; |
a2907882 | 889 | register struct ucred *cr; |
f0f1cbaa | 890 | struct mbuf *msk, *mtch; |
958df9fb | 891 | int *wascomp; |
a2907882 KM |
892 | { |
893 | register int i; | |
206e686b | 894 | register u_long *tl; |
0bd503ad KM |
895 | register long t1; |
896 | caddr_t dpos, cp2; | |
897 | int error = 0; | |
898 | struct mbuf *mrep, *md; | |
899 | int len; | |
a2907882 | 900 | |
f0f1cbaa | 901 | if (so->so_proto->pr_flags & PR_CONNREQUIRED) { |
f0f1cbaa | 902 | error = nfs_receive(so, nam, &mrep, (struct nfsreq *)0); |
f0f1cbaa KM |
903 | } else { |
904 | mrep = (struct mbuf *)0; | |
905 | do { | |
906 | if (mrep) { | |
907 | m_freem(*nam); | |
908 | m_freem(mrep); | |
909 | } | |
910 | error = nfs_receive(so, nam, &mrep, (struct nfsreq *)0); | |
911 | } while (!error && nfs_badnam(*nam, msk, mtch)); | |
912 | } | |
913 | if (error) | |
a2907882 KM |
914 | return (error); |
915 | md = mrep; | |
958df9fb KM |
916 | mrep = nfs_uncompress(mrep); |
917 | if (mrep != md) { | |
918 | *wascomp = 1; | |
919 | md = mrep; | |
920 | } else | |
921 | *wascomp = 0; | |
a2907882 | 922 | dpos = mtod(mrep, caddr_t); |
206e686b KM |
923 | nfsm_disect(tl, u_long *, 10*NFSX_UNSIGNED); |
924 | *retxid = *tl++; | |
925 | if (*tl++ != rpc_call) { | |
a2907882 KM |
926 | m_freem(mrep); |
927 | return (ERPCMISMATCH); | |
928 | } | |
206e686b | 929 | if (*tl++ != rpc_vers) { |
a2907882 KM |
930 | m_freem(mrep); |
931 | return (ERPCMISMATCH); | |
932 | } | |
206e686b | 933 | if (*tl++ != prog) { |
a2907882 KM |
934 | m_freem(mrep); |
935 | return (EPROGUNAVAIL); | |
936 | } | |
206e686b | 937 | if (*tl++ != vers) { |
a2907882 KM |
938 | m_freem(mrep); |
939 | return (EPROGMISMATCH); | |
940 | } | |
206e686b | 941 | *procnum = fxdr_unsigned(u_long, *tl++); |
d4e5799e | 942 | if (*procnum == NFSPROC_NULL) { |
a2907882 KM |
943 | *mrp = mrep; |
944 | return (0); | |
945 | } | |
206e686b | 946 | if (*procnum > maxproc || *tl++ != rpc_auth_unix) { |
a2907882 KM |
947 | m_freem(mrep); |
948 | return (EPROCUNAVAIL); | |
949 | } | |
206e686b | 950 | len = fxdr_unsigned(int, *tl++); |
f0f1cbaa KM |
951 | if (len < 0 || len > RPCAUTH_MAXSIZ) { |
952 | m_freem(mrep); | |
953 | return (EBADRPC); | |
954 | } | |
206e686b | 955 | len = fxdr_unsigned(int, *++tl); |
f0f1cbaa KM |
956 | if (len < 0 || len > NFS_MAXNAMLEN) { |
957 | m_freem(mrep); | |
958 | return (EBADRPC); | |
959 | } | |
0bd503ad | 960 | nfsm_adv(nfsm_rndup(len)); |
206e686b KM |
961 | nfsm_disect(tl, u_long *, 3*NFSX_UNSIGNED); |
962 | cr->cr_uid = fxdr_unsigned(uid_t, *tl++); | |
963 | cr->cr_gid = fxdr_unsigned(gid_t, *tl++); | |
964 | len = fxdr_unsigned(int, *tl); | |
f0f1cbaa | 965 | if (len < 0 || len > RPCAUTH_UNIXGIDS) { |
a2907882 KM |
966 | m_freem(mrep); |
967 | return (EBADRPC); | |
968 | } | |
206e686b | 969 | nfsm_disect(tl, u_long *, (len + 2)*NFSX_UNSIGNED); |
0bd503ad | 970 | for (i = 1; i <= len; i++) |
f0f1cbaa | 971 | if (i < NGROUPS) |
206e686b | 972 | cr->cr_groups[i] = fxdr_unsigned(gid_t, *tl++); |
f0f1cbaa | 973 | else |
206e686b | 974 | tl++; |
f0f1cbaa | 975 | cr->cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); |
a2907882 KM |
976 | /* |
977 | * Do we have any use for the verifier. | |
978 | * According to the "Remote Procedure Call Protocol Spec." it | |
979 | * should be AUTH_NULL, but some clients make it AUTH_UNIX? | |
980 | * For now, just skip over it | |
981 | */ | |
206e686b | 982 | len = fxdr_unsigned(int, *++tl); |
f0f1cbaa KM |
983 | if (len < 0 || len > RPCAUTH_MAXSIZ) { |
984 | m_freem(mrep); | |
985 | return (EBADRPC); | |
986 | } | |
0bd503ad KM |
987 | if (len > 0) |
988 | nfsm_adv(nfsm_rndup(len)); | |
a2907882 KM |
989 | *mrp = mrep; |
990 | *mdp = md; | |
991 | *dposp = dpos; | |
992 | return (0); | |
993 | nfsmout: | |
994 | return (error); | |
995 | } | |
996 | ||
997 | /* | |
998 | * Generate the rpc reply header | |
999 | * siz arg. is used to decide if adding a cluster is worthwhile | |
1000 | */ | |
1001 | nfs_rephead(siz, retxid, err, mrq, mbp, bposp) | |
1002 | int siz; | |
1003 | u_long retxid; | |
1004 | int err; | |
1005 | struct mbuf **mrq; | |
1006 | struct mbuf **mbp; | |
1007 | caddr_t *bposp; | |
1008 | { | |
206e686b | 1009 | register u_long *tl; |
0bd503ad KM |
1010 | register long t1; |
1011 | caddr_t bpos; | |
1012 | struct mbuf *mreq, *mb, *mb2; | |
a2907882 KM |
1013 | |
1014 | NFSMGETHDR(mreq); | |
1015 | mb = mreq; | |
1016 | if ((siz+RPC_REPLYSIZ) > MHLEN) | |
f0f1cbaa | 1017 | MCLGET(mreq, M_WAIT); |
206e686b | 1018 | tl = mtod(mreq, u_long *); |
a2907882 | 1019 | mreq->m_len = 6*NFSX_UNSIGNED; |
206e686b KM |
1020 | bpos = ((caddr_t)tl)+mreq->m_len; |
1021 | *tl++ = retxid; | |
1022 | *tl++ = rpc_reply; | |
a2907882 | 1023 | if (err == ERPCMISMATCH) { |
206e686b KM |
1024 | *tl++ = rpc_msgdenied; |
1025 | *tl++ = rpc_mismatch; | |
1026 | *tl++ = txdr_unsigned(2); | |
1027 | *tl = txdr_unsigned(2); | |
a2907882 | 1028 | } else { |
206e686b KM |
1029 | *tl++ = rpc_msgaccepted; |
1030 | *tl++ = 0; | |
1031 | *tl++ = 0; | |
a2907882 KM |
1032 | switch (err) { |
1033 | case EPROGUNAVAIL: | |
206e686b | 1034 | *tl = txdr_unsigned(RPC_PROGUNAVAIL); |
a2907882 KM |
1035 | break; |
1036 | case EPROGMISMATCH: | |
206e686b KM |
1037 | *tl = txdr_unsigned(RPC_PROGMISMATCH); |
1038 | nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED); | |
1039 | *tl++ = txdr_unsigned(2); | |
1040 | *tl = txdr_unsigned(2); /* someday 3 */ | |
a2907882 KM |
1041 | break; |
1042 | case EPROCUNAVAIL: | |
206e686b | 1043 | *tl = txdr_unsigned(RPC_PROCUNAVAIL); |
a2907882 KM |
1044 | break; |
1045 | default: | |
206e686b | 1046 | *tl = 0; |
a2907882 | 1047 | if (err != VNOVAL) { |
206e686b KM |
1048 | nfsm_build(tl, u_long *, NFSX_UNSIGNED); |
1049 | *tl = txdr_unsigned(err); | |
a2907882 KM |
1050 | } |
1051 | break; | |
1052 | }; | |
1053 | } | |
1054 | *mrq = mreq; | |
1055 | *mbp = mb; | |
1056 | *bposp = bpos; | |
1057 | if (err != 0 && err != VNOVAL) | |
1058 | nfsstats.srvrpc_errs++; | |
1059 | return (0); | |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Nfs timer routine | |
1064 | * Scan the nfsreq list and retranmit any requests that have timed out | |
1065 | * To avoid retransmission attempts on STREAM sockets (in the future) make | |
2f08b65a | 1066 | * sure to set the r_retry field to 0 (implies nm_retry == 0). |
a2907882 KM |
1067 | */ |
1068 | nfs_timer() | |
1069 | { | |
1070 | register struct nfsreq *rep; | |
1071 | register struct mbuf *m; | |
1072 | register struct socket *so; | |
f0f1cbaa | 1073 | register struct nfsmount *nmp; |
2f08b65a | 1074 | int s, error; |
a2907882 KM |
1075 | |
1076 | s = splnet(); | |
f0f1cbaa KM |
1077 | for (rep = nfsreqh.r_next; rep != &nfsreqh; rep = rep->r_next) { |
1078 | nmp = rep->r_nmp; | |
1079 | if (rep->r_mrep || (rep->r_flags & R_SOFTTERM) || | |
1080 | (so = nmp->nm_so) == NULL) | |
1081 | continue; | |
1082 | if ((nmp->nm_flag & NFSMNT_INT) && nfs_sigintr(rep->r_procp)) { | |
1083 | rep->r_flags |= R_SOFTTERM; | |
1084 | continue; | |
1085 | } | |
2f08b65a | 1086 | if (rep->r_flags & R_TIMING) /* update rtt in mount */ |
f0f1cbaa | 1087 | nmp->nm_rtt++; |
f0f1cbaa KM |
1088 | /* If not timed out */ |
1089 | if (++rep->r_timer < nmp->nm_rto) | |
2f08b65a KM |
1090 | continue; |
1091 | /* Do backoff and save new timeout in mount */ | |
1092 | if (rep->r_flags & R_TIMING) { | |
f0f1cbaa | 1093 | nfs_backofftimer(nmp); |
2f08b65a | 1094 | rep->r_flags &= ~R_TIMING; |
f0f1cbaa | 1095 | nmp->nm_rtt = -1; |
2f08b65a KM |
1096 | } |
1097 | if (rep->r_flags & R_SENT) { | |
1098 | rep->r_flags &= ~R_SENT; | |
f0f1cbaa | 1099 | nmp->nm_sent--; |
2f08b65a | 1100 | } |
f0f1cbaa KM |
1101 | |
1102 | /* | |
1103 | * Check for too many retries on soft mount. | |
1104 | * nb: For hard mounts, r_retry == NFS_MAXREXMIT+1 | |
1105 | */ | |
1106 | if (++rep->r_rexmit > NFS_MAXREXMIT) | |
2f08b65a | 1107 | rep->r_rexmit = NFS_MAXREXMIT; |
2f08b65a | 1108 | |
f0f1cbaa KM |
1109 | /* |
1110 | * Check for server not responding | |
1111 | */ | |
1112 | if ((rep->r_flags & R_TPRINTFMSG) == 0 && | |
170bfd05 | 1113 | rep->r_rexmit > NFS_FISHY) { |
79993818 MK |
1114 | nfs_msg(rep->r_procp, |
1115 | nmp->nm_mountp->mnt_stat.f_mntfromname, | |
1116 | "not responding"); | |
f0f1cbaa KM |
1117 | rep->r_flags |= R_TPRINTFMSG; |
1118 | } | |
170bfd05 | 1119 | if (rep->r_rexmit >= rep->r_retry) { /* too many */ |
f0f1cbaa KM |
1120 | nfsstats.rpctimeouts++; |
1121 | rep->r_flags |= R_SOFTTERM; | |
1122 | continue; | |
1123 | } | |
170bfd05 KM |
1124 | if (nmp->nm_sotype != SOCK_DGRAM) |
1125 | continue; | |
f0f1cbaa KM |
1126 | |
1127 | /* | |
1128 | * If there is enough space and the window allows.. | |
1129 | * Resend it | |
1130 | */ | |
1131 | if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && | |
1132 | nmp->nm_sent < nmp->nm_window && | |
1133 | (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ | |
1134 | nfsstats.rpcretries++; | |
1135 | if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) | |
1136 | error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, | |
1137 | (caddr_t)0, (struct mbuf *)0, (struct mbuf *)0); | |
1138 | else | |
1139 | error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, | |
1140 | nmp->nm_nam, (struct mbuf *)0, (struct mbuf *)0); | |
1141 | if (error) { | |
1142 | if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) | |
1143 | so->so_error = 0; | |
1144 | } else { | |
1145 | /* | |
1146 | * We need to time the request even though we | |
1147 | * are retransmitting. | |
1148 | */ | |
1149 | nmp->nm_rtt = 0; | |
1150 | nmp->nm_sent++; | |
1151 | rep->r_flags |= (R_SENT|R_TIMING); | |
1152 | rep->r_timer = rep->r_timerinit; | |
1153 | } | |
1154 | } | |
2f08b65a KM |
1155 | } |
1156 | splx(s); | |
1157 | timeout(nfs_timer, (caddr_t)0, hz/NFS_HZ); | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * NFS timer update and backoff. The "Jacobson/Karels/Karn" scheme is | |
1162 | * used here. The timer state is held in the nfsmount structure and | |
1163 | * a single request is used to clock the response. When successful | |
1164 | * the rtt smoothing in nfs_updatetimer is used, when failed the backoff | |
1165 | * is done by nfs_backofftimer. We also log failure messages in these | |
1166 | * routines. | |
1167 | * | |
1168 | * Congestion variables are held in the nfshost structure which | |
1169 | * is referenced by nfsmounts and shared per-server. This separation | |
1170 | * makes it possible to do per-mount timing which allows varying disk | |
1171 | * access times to be dealt with, while preserving a network oriented | |
1172 | * congestion control scheme. | |
1173 | * | |
1174 | * The windowing implements the Jacobson/Karels slowstart algorithm | |
1175 | * with adjusted scaling factors. We start with one request, then send | |
1176 | * 4 more after each success until the ssthresh limit is reached, then | |
1177 | * we increment at a rate proportional to the window. On failure, we | |
1178 | * remember 3/4 the current window and clamp the send limit to 1. Note | |
1179 | * ICMP source quench is not reflected in so->so_error so we ignore that | |
1180 | * for now. | |
1181 | * | |
1182 | * NFS behaves much more like a transport protocol with these changes, | |
1183 | * shedding the teenage pedal-to-the-metal tendencies of "other" | |
1184 | * implementations. | |
1185 | * | |
1186 | * Timers and congestion avoidance by Tom Talpey, Open Software Foundation. | |
1187 | */ | |
1188 | ||
1189 | /* | |
1190 | * The TCP algorithm was not forgiving enough. Because the NFS server | |
1191 | * responds only after performing lookups/diskio/etc, we have to be | |
1192 | * more prepared to accept a spiky variance. The TCP algorithm is: | |
f0f1cbaa | 1193 | * TCP_RTO(nmp) ((((nmp)->nm_srtt >> 2) + (nmp)->nm_rttvar) >> 1) |
2f08b65a | 1194 | */ |
f0f1cbaa | 1195 | #define NFS_RTO(nmp) (((nmp)->nm_srtt >> 3) + (nmp)->nm_rttvar) |
2f08b65a | 1196 | |
f0f1cbaa KM |
1197 | nfs_updatetimer(nmp) |
1198 | register struct nfsmount *nmp; | |
2f08b65a | 1199 | { |
2f08b65a KM |
1200 | |
1201 | /* If retransmitted, clear and return */ | |
f0f1cbaa KM |
1202 | if (nmp->nm_rexmit || nmp->nm_currexmit) { |
1203 | nmp->nm_rexmit = nmp->nm_currexmit = 0; | |
2f08b65a KM |
1204 | return; |
1205 | } | |
1206 | /* If have a measurement, do smoothing */ | |
f0f1cbaa | 1207 | if (nmp->nm_srtt) { |
2f08b65a | 1208 | register short delta; |
f0f1cbaa KM |
1209 | delta = nmp->nm_rtt - (nmp->nm_srtt >> 3); |
1210 | if ((nmp->nm_srtt += delta) <= 0) | |
1211 | nmp->nm_srtt = 1; | |
2f08b65a KM |
1212 | if (delta < 0) |
1213 | delta = -delta; | |
f0f1cbaa KM |
1214 | delta -= (nmp->nm_rttvar >> 2); |
1215 | if ((nmp->nm_rttvar += delta) <= 0) | |
1216 | nmp->nm_rttvar = 1; | |
2f08b65a KM |
1217 | /* Else initialize */ |
1218 | } else { | |
f0f1cbaa KM |
1219 | nmp->nm_rttvar = nmp->nm_rtt << 1; |
1220 | if (nmp->nm_rttvar == 0) nmp->nm_rttvar = 2; | |
1221 | nmp->nm_srtt = nmp->nm_rttvar << 2; | |
2f08b65a KM |
1222 | } |
1223 | /* Compute new Retransmission TimeOut and clip */ | |
f0f1cbaa KM |
1224 | nmp->nm_rto = NFS_RTO(nmp); |
1225 | if (nmp->nm_rto < NFS_MINTIMEO) | |
1226 | nmp->nm_rto = NFS_MINTIMEO; | |
1227 | else if (nmp->nm_rto > NFS_MAXTIMEO) | |
1228 | nmp->nm_rto = NFS_MAXTIMEO; | |
2f08b65a KM |
1229 | |
1230 | /* Update window estimate */ | |
f0f1cbaa KM |
1231 | if (nmp->nm_window < nmp->nm_ssthresh) /* quickly */ |
1232 | nmp->nm_window += 4; | |
2f08b65a | 1233 | else { /* slowly */ |
f0f1cbaa KM |
1234 | register long incr = ++nmp->nm_winext; |
1235 | incr = (incr * incr) / nmp->nm_window; | |
2f08b65a | 1236 | if (incr > 0) { |
f0f1cbaa KM |
1237 | nmp->nm_winext = 0; |
1238 | ++nmp->nm_window; | |
2f08b65a KM |
1239 | } |
1240 | } | |
f0f1cbaa KM |
1241 | if (nmp->nm_window > NFS_MAXWINDOW) |
1242 | nmp->nm_window = NFS_MAXWINDOW; | |
2f08b65a KM |
1243 | } |
1244 | ||
f0f1cbaa KM |
1245 | nfs_backofftimer(nmp) |
1246 | register struct nfsmount *nmp; | |
2f08b65a | 1247 | { |
2f08b65a KM |
1248 | register unsigned long newrto; |
1249 | ||
1250 | /* Clip shift count */ | |
f0f1cbaa KM |
1251 | if (++nmp->nm_rexmit > 8 * sizeof nmp->nm_rto) |
1252 | nmp->nm_rexmit = 8 * sizeof nmp->nm_rto; | |
2f08b65a | 1253 | /* Back off RTO exponentially */ |
f0f1cbaa KM |
1254 | newrto = NFS_RTO(nmp); |
1255 | newrto <<= (nmp->nm_rexmit - 1); | |
2f08b65a KM |
1256 | if (newrto == 0 || newrto > NFS_MAXTIMEO) |
1257 | newrto = NFS_MAXTIMEO; | |
f0f1cbaa | 1258 | nmp->nm_rto = newrto; |
2f08b65a KM |
1259 | |
1260 | /* If too many retries, message, assume a bogus RTT and re-measure */ | |
f0f1cbaa KM |
1261 | if (nmp->nm_currexmit < nmp->nm_rexmit) { |
1262 | nmp->nm_currexmit = nmp->nm_rexmit; | |
1263 | if (nmp->nm_currexmit >= nfsrexmtthresh) { | |
1264 | if (nmp->nm_currexmit == nfsrexmtthresh) { | |
1265 | nmp->nm_rttvar += (nmp->nm_srtt >> 2); | |
1266 | nmp->nm_srtt = 0; | |
a2907882 KM |
1267 | } |
1268 | } | |
a2907882 | 1269 | } |
2f08b65a | 1270 | /* Close down window but remember this point (3/4 current) for later */ |
f0f1cbaa KM |
1271 | nmp->nm_ssthresh = ((nmp->nm_window << 1) + nmp->nm_window) >> 2; |
1272 | nmp->nm_window = 1; | |
1273 | nmp->nm_winext = 0; | |
a2907882 KM |
1274 | } |
1275 | ||
1276 | /* | |
f0f1cbaa KM |
1277 | * Test for a termination signal pending on procp. |
1278 | * This is used for NFSMNT_INT mounts. | |
a2907882 | 1279 | */ |
f0f1cbaa KM |
1280 | nfs_sigintr(p) |
1281 | register struct proc *p; | |
1282 | { | |
1283 | if (p && p->p_sig && (((p->p_sig &~ p->p_sigmask) &~ p->p_sigignore) & | |
1284 | NFSINT_SIGMASK)) | |
1285 | return (1); | |
1286 | else | |
1287 | return (0); | |
1288 | } | |
2f08b65a | 1289 | |
79993818 MK |
1290 | nfs_msg(p, server, msg) |
1291 | struct proc *p; | |
1292 | char *server, *msg; | |
1293 | { | |
1294 | tpr_t tpr; | |
1295 | ||
1296 | if (p) | |
1297 | tpr = tprintf_open(p); | |
1298 | else | |
1299 | tpr = NULL; | |
1300 | tprintf(tpr, "nfs server %s: %s\n", server, msg); | |
1301 | tprintf_close(tpr); | |
1302 | } | |
1303 | ||
f0f1cbaa KM |
1304 | /* |
1305 | * Lock a socket against others. | |
1306 | * Necessary for STREAM sockets to ensure you get an entire rpc request/reply | |
1307 | * and also to avoid race conditions between the processes with nfs requests | |
1308 | * in progress when a reconnect is necessary. | |
1309 | */ | |
170bfd05 KM |
1310 | nfs_solock(flagp) |
1311 | register int *flagp; | |
a2907882 | 1312 | { |
2f08b65a | 1313 | |
f0f1cbaa KM |
1314 | while (*flagp & NFSMNT_SCKLOCK) { |
1315 | *flagp |= NFSMNT_WANTSCK; | |
170bfd05 | 1316 | (void) tsleep((caddr_t)flagp, PZERO-1, "nfsolck", 0); |
2f08b65a | 1317 | } |
f0f1cbaa KM |
1318 | *flagp |= NFSMNT_SCKLOCK; |
1319 | } | |
2f08b65a | 1320 | |
f0f1cbaa KM |
1321 | /* |
1322 | * Unlock the stream socket for others. | |
1323 | */ | |
1324 | nfs_sounlock(flagp) | |
170bfd05 | 1325 | register int *flagp; |
f0f1cbaa KM |
1326 | { |
1327 | ||
1328 | if ((*flagp & NFSMNT_SCKLOCK) == 0) | |
1329 | panic("nfs sounlock"); | |
1330 | *flagp &= ~NFSMNT_SCKLOCK; | |
1331 | if (*flagp & NFSMNT_WANTSCK) { | |
1332 | *flagp &= ~NFSMNT_WANTSCK; | |
1333 | wakeup((caddr_t)flagp); | |
2f08b65a | 1334 | } |
f0f1cbaa KM |
1335 | } |
1336 | ||
1337 | /* | |
1338 | * This function compares two net addresses by family and returns TRUE | |
1339 | * if they are the same. | |
1340 | * If there is any doubt, return FALSE. | |
1341 | */ | |
1342 | nfs_netaddr_match(nam1, nam2) | |
1343 | struct mbuf *nam1, *nam2; | |
1344 | { | |
1345 | register struct sockaddr *saddr1, *saddr2; | |
1346 | ||
1347 | saddr1 = mtod(nam1, struct sockaddr *); | |
1348 | saddr2 = mtod(nam2, struct sockaddr *); | |
1349 | if (saddr1->sa_family != saddr2->sa_family) | |
1350 | return (0); | |
1351 | ||
1352 | /* | |
1353 | * Must do each address family separately since unused fields | |
1354 | * are undefined values and not always zeroed. | |
1355 | */ | |
1356 | switch (saddr1->sa_family) { | |
1357 | case AF_INET: | |
1358 | if (((struct sockaddr_in *)saddr1)->sin_addr.s_addr == | |
1359 | ((struct sockaddr_in *)saddr2)->sin_addr.s_addr) | |
1360 | return (1); | |
1361 | break; | |
1362 | default: | |
1363 | break; | |
1364 | }; | |
1365 | return (0); | |
1366 | } | |
1367 | ||
1368 | /* | |
1369 | * Check the hostname fields for nfsd's mask and match fields. | |
1370 | * By address family: | |
1371 | * - Bitwise AND the mask with the host address field | |
1372 | * - Compare for == with match | |
1373 | * return TRUE if not equal | |
1374 | */ | |
1375 | nfs_badnam(nam, msk, mtch) | |
1376 | register struct mbuf *nam, *msk, *mtch; | |
1377 | { | |
1378 | switch (mtod(nam, struct sockaddr *)->sa_family) { | |
1379 | case AF_INET: | |
1380 | return ((mtod(nam, struct sockaddr_in *)->sin_addr.s_addr & | |
1381 | mtod(msk, struct sockaddr_in *)->sin_addr.s_addr) != | |
1382 | mtod(mtch, struct sockaddr_in *)->sin_addr.s_addr); | |
1383 | default: | |
1384 | printf("nfs_badmatch, unknown sa_family\n"); | |
1385 | return (0); | |
1386 | }; | |
a2907882 | 1387 | } |