2 * Copyright (c) 1999, Boris Popov
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $FreeBSD: src/sys/netncp/ncp_conn.c,v 1.3.2.5 2001/02/22 08:54:11 bp Exp $
32 * $DragonFly: src/sys/netproto/ncp/ncp_conn.c,v 1.15 2007/05/13 18:33:58 swildner Exp $
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
43 #include <sys/sysctl.h>
49 SLIST_HEAD(ncp_handle_head,ncp_handle);
51 int ncp_burst_enabled = 1;
53 struct ncp_conn_head conn_list={NULL};
54 static int ncp_conn_cnt = 0;
55 static int ncp_next_ref = 1;
56 static struct lock listlock;
58 struct ncp_handle_head lhlist={NULL};
59 static int ncp_next_handle = 1;
60 static struct lock lhlock;
62 static int ncp_sysctl_connstat(SYSCTL_HANDLER_ARGS);
63 static int ncp_conn_lock_any(struct ncp_conn *conn, struct thread *td,
66 SYSCTL_DECL(_net_ncp);
67 SYSCTL_INT (_net_ncp, OID_AUTO, burst_enabled, CTLFLAG_RD, &ncp_burst_enabled, 0, "");
68 SYSCTL_INT (_net_ncp, OID_AUTO, conn_cnt, CTLFLAG_RD, &ncp_conn_cnt, 0, "");
69 SYSCTL_PROC(_net_ncp, OID_AUTO, conn_stat, CTLFLAG_RD|CTLTYPE_OPAQUE,
70 NULL, 0, ncp_sysctl_connstat, "S,connstat", "Connections list");
72 MALLOC_DEFINE(M_NCPDATA, "NCP data", "NCP private data");
76 lockinit(&listlock, "ncpll", 0, 0);
77 lockinit(&lhlock, "ncplh", 0, 0);
82 ncp_conn_locklist(int flags, struct thread *td)
84 return lockmgr(&listlock, flags | LK_CANRECURSE);
88 ncp_conn_unlocklist(struct thread *td)
90 lockmgr(&listlock, LK_RELEASE);
94 ncp_conn_access(struct ncp_conn *conn, struct ucred *cred, mode_t mode)
98 if (cred == NOCRED || ncp_suser(cred) == 0 ||
99 cred->cr_uid == conn->nc_owner->cr_uid)
102 if (!groupmember(conn->nc_group, cred))
104 error = (conn->li.access_mode & mode) == mode ? 0 : EACCES;
109 * NOTE: The lockmgr() call is protected by nc_lwant
112 ncp_conn_lock_any(struct ncp_conn *conn, struct thread *td, struct ucred *cred)
116 if (conn->nc_id == 0)
118 error = lockmgr(&conn->nc_lock, LK_EXCLUSIVE | LK_CANRECURSE);
119 if (error == ERESTART)
121 error = ncp_chkintr(conn, td);
123 lockmgr(&conn->nc_lock, LK_RELEASE);
127 if (conn->nc_id == 0) {
128 lockmgr(&conn->nc_lock, LK_RELEASE);
131 conn->td = td; /* who currently operates */
137 * NOTE: The lockmgr() call should be protected by nc_lwant, but it
138 * is unclear whether callers have coded this correctly.
141 ncp_conn_lock(struct ncp_conn *conn, struct thread *td,
142 struct ucred *cred, int mode)
146 error = ncp_conn_access(conn, cred, mode);
149 return ncp_conn_lock_any(conn, td, cred);
153 * Lock conn but unlock connlist
156 ncp_conn_lock2(struct ncp_conn *conn, struct thread *td,
157 struct ucred *cred, int mode)
161 error = ncp_conn_access(conn, cred, mode);
163 ncp_conn_unlocklist(td);
167 ncp_conn_unlocklist(td);
168 error = ncp_conn_lock_any(conn, td, cred);
170 if (conn->nc_lwant == 0) {
171 wakeup(&conn->nc_lwant);
177 ncp_conn_unlock(struct ncp_conn *conn, struct thread *td) {
179 * note, that LK_RELASE will do wakeup() instead of wakeup_one().
180 * this will do a little overhead
182 lockmgr(&conn->nc_lock, LK_RELEASE);
186 ncp_conn_assert_locked(struct ncp_conn *conn, const char *checker,
189 if (conn->nc_lock.lk_flags & LK_HAVE_EXCL)
191 kprintf("%s: connection isn't locked!\n", checker);
196 * create, fill with defaults and return in locked state
199 ncp_conn_alloc(struct thread *td, struct ucred *cred, struct ncp_conn **conn)
202 struct ncp_conn *ncp;
204 MALLOC(ncp, struct ncp_conn *, sizeof(struct ncp_conn),
205 M_NCPDATA, M_WAITOK | M_ZERO);
207 lockinit(&ncp->nc_lock, "ncplck", 0, 0);
209 ncp->nc_id = ncp_next_ref++;
210 ncp->nc_owner = cred;
212 ncp->connid = 0xFFFF;
213 ncp_conn_lock_any(ncp, td, ncp->nc_owner);
215 ncp_conn_locklist(LK_EXCLUSIVE, td);
216 SLIST_INSERT_HEAD(&conn_list,ncp,nc_next);
217 ncp_conn_unlocklist(td);
222 * Remove the connection, on entry it must be locked
225 ncp_conn_free(struct ncp_conn *ncp)
228 struct ncp_conn *ncp1;
231 NCPFATAL("conn==NULL !\n");
234 if (ncp->nc_id == 0) {
235 kprintf("already!!!!\n");
238 error = ncp_conn_assert_locked(ncp, __func__, ncp->td);
242 NCPFATAL("there are %d references left\n",ncp->ref_cnt);
247 * Mark conn as died and wait for other process. This also
248 * interlocks against other ncp_conn_free() ops.
251 while (ncp->nc_lwant) {
252 ncp_conn_unlock(ncp, ncp->td);
253 kprintf("lwant = %d\n", ncp->nc_lwant);
254 tsleep(&ncp->nc_lwant, 0, "ncpdr", 2*hz);
255 lockmgr(&ncp->nc_lock, LK_EXCLUSIVE);
257 ncp_conn_locklist(LK_EXCLUSIVE, ncp->td);
258 SLIST_FOREACH(ncp1, &conn_list, nc_next) {
262 KKASSERT(ncp1 == ncp);
263 SLIST_REMOVE(&conn_list, ncp, ncp_conn, nc_next);
265 ncp_conn_unlocklist(ncp->td);
266 if (ncp->li.user) kfree(ncp->li.user, M_NCPDATA);
267 if (ncp->li.password) kfree(ncp->li.password, M_NCPDATA);
268 crfree(ncp->nc_owner);
269 FREE(ncp, M_NCPDATA);
274 * Lookup connection by handle, return a locked conn descriptor
277 ncp_conn_getbyref(int ref,struct thread *td,struct ucred *cred, int mode, struct ncp_conn **connpp){
278 struct ncp_conn *ncp;
281 ncp_conn_locklist(LK_SHARED, td);
282 SLIST_FOREACH(ncp, &conn_list, nc_next)
283 if (ncp->nc_id == ref) break;
285 ncp_conn_unlocklist(td);
288 error = ncp_conn_lock2(ncp, td, cred, mode);
294 * find attached, but not logged in connection to specified server
297 ncp_conn_getattached(struct ncp_conn_args *li,struct thread *td,struct ucred *cred,int mode, struct ncp_conn **connpp){
298 struct ncp_conn *ncp, *ncp2=NULL;
301 ncp_conn_locklist(LK_SHARED, td);
302 SLIST_FOREACH(ncp, &conn_list, nc_next) {
303 if ((ncp->flags & NCPFL_LOGGED) != 0 ||
304 strcmp(ncp->li.server,li->server) != 0 ||
305 ncp->li.saddr.sa_len != li->saddr.sa_len ||
306 bcmp(&ncp->li.saddr,&ncp->li.saddr,li->saddr.sa_len) != 0)
308 if (ncp_suser(cred) == 0 ||
309 cred->cr_uid == ncp->nc_owner->cr_uid)
311 error = ncp_conn_access(ncp,cred,mode);
312 if (!error && ncp2 == NULL)
315 if (ncp == NULL) ncp = ncp2;
317 ncp_conn_unlocklist(td);
320 error = ncp_conn_lock2(ncp,td,cred,mode);
327 * Lookup connection by server/user pair, return a locked conn descriptor.
328 * if li is NULL or server/user pair incomplete, try to select best connection
330 * Connection selected in next order:
331 * 1. Try to search conn with ucred owner, if li is NULL also find a primary
332 * 2. If 1. fails try to get first suitable shared connection
333 * 3. If 2. fails then nothing can help to poor ucred owner
337 ncp_conn_getbyli(struct ncp_conn_args *li, struct thread *td,
338 struct ucred *cred, int mode, struct ncp_conn **connpp)
340 struct ncp_conn *ncp, *ncp2=NULL;
341 int error=0, partial, haveserv;
343 partial = (li == NULL || li->server[0] == 0 || li->user == NULL);
344 haveserv = (li && li->server[0]);
345 ncp_conn_locklist(LK_SHARED, td);
346 SLIST_FOREACH(ncp, &conn_list, nc_next) {
348 if (cred->cr_uid == ncp->nc_owner->cr_uid) {
350 if (strcmp(ncp->li.server,li->server) == 0)
353 if (ncp->flags & NCPFL_PRIMARY)
360 if (strcmp(ncp->li.server,li->server) != 0 ||
361 ncp->li.user == NULL ||
362 strcmp(ncp->li.user,li->user) != 0)
364 if (cred->cr_uid == ncp->nc_owner->cr_uid)
366 if (ncp_suser(cred) == 0)
369 error = ncp_conn_access(ncp,cred,mode);
370 if (!error && ncp2 == NULL)
373 if (ncp == NULL) ncp = ncp2;
375 ncp_conn_unlocklist(td);
378 error = ncp_conn_lock2(ncp,td,cred,mode);
385 * Set primary connection flag, since it have sence only for an owner,
386 * only owner can modify this flag.
387 * connection expected to be locked.
390 ncp_conn_setprimary(struct ncp_conn *conn, int on){
391 struct ncp_conn *ncp=NULL;
393 if (conn->ucred->cr_uid != conn->nc_owner->cr_uid)
395 ncp_conn_locklist(LK_SHARED, conn->td);
396 SLIST_FOREACH(ncp, &conn_list, nc_next) {
397 if (conn->ucred->cr_uid == ncp->nc_owner->cr_uid)
398 ncp->flags &= ~NCPFL_PRIMARY;
400 ncp_conn_unlocklist(conn->td);
402 conn->flags |= NCPFL_PRIMARY;
406 * Lease conn to given proc, returning unique handle
407 * problem: how locks should be applied ?
410 ncp_conn_gethandle(struct ncp_conn *conn, struct thread *td, struct ncp_handle **handle){
411 struct ncp_handle *refp;
413 lockmgr(&lhlock, LK_EXCLUSIVE);
414 SLIST_FOREACH(refp, &lhlist, nh_next)
415 if (refp->nh_conn == conn && td == refp->nh_td) break;
420 lockmgr(&lhlock, LK_RELEASE);
423 MALLOC(refp,struct ncp_handle *,sizeof(struct ncp_handle),M_NCPDATA,
425 SLIST_INSERT_HEAD(&lhlist,refp,nh_next);
428 refp->nh_conn = conn;
429 refp->nh_id = ncp_next_handle++;
432 lockmgr(&lhlock, LK_RELEASE);
436 * release reference, if force - ignore refcount
439 ncp_conn_puthandle(struct ncp_handle *handle, struct thread *td, int force) {
440 struct ncp_handle *refp = handle;
442 lockmgr(&lhlock, LK_EXCLUSIVE);
444 refp->nh_conn->ref_cnt--;
446 refp->nh_conn->ref_cnt -= refp->nh_ref;
449 if (refp->nh_ref == 0) {
450 SLIST_REMOVE(&lhlist, refp, ncp_handle, nh_next);
451 FREE(refp, M_NCPDATA);
453 lockmgr(&lhlock, LK_RELEASE);
460 ncp_conn_findhandle(int connHandle, struct thread *td, struct ncp_handle **handle) {
461 struct ncp_handle *refp;
463 lockmgr(&lhlock, LK_SHARED);
464 SLIST_FOREACH(refp, &lhlist, nh_next)
465 if (refp->nh_td == td && refp->nh_id == connHandle) break;
466 lockmgr(&lhlock, LK_RELEASE);
474 * Clear handles associated with specified process
477 ncp_conn_putprochandles(struct thread *td) {
478 struct ncp_handle *hp, *nhp;
481 lockmgr(&lhlock, LK_EXCLUSIVE);
482 for (hp = SLIST_FIRST(&lhlist); hp; hp = nhp) {
483 nhp = SLIST_NEXT(hp, nh_next);
484 if (hp->nh_td != td) continue;
486 hp->nh_conn->ref_cnt -= hp->nh_ref;
487 SLIST_REMOVE(&lhlist, hp, ncp_handle, nh_next);
490 lockmgr(&lhlock, LK_RELEASE);
494 * remove references in all possible connections,
495 * XXX - possible problem is a locked list.
498 ncp_conn_list_rm_ref(pid_t pid) {
499 struct ncp_conn *ncp;
501 ncp_conn_locklist(LK_SHARED, NULL);
502 SLIST_FOREACH(ncp, &conn_list, nc_next) {
503 ncp_conn_rm_ref(ncp,pid,1);
505 ncp_conn_unlocklist(NULL);
510 ncp_conn_getinfo(struct ncp_conn *ncp, struct ncp_conn_stat *ncs) {
511 bzero(ncs,sizeof(*ncs));
513 ncs->li.user = ncs->user;
515 strcpy(ncs->user, ncp->li.user);
516 ncs->li.password = NULL;
517 ncs->connRef = ncp->nc_id;
518 ncs->ref_cnt = ncp->ref_cnt;
519 ncs->connid = ncp->connid;
520 ncs->owner = ncp->nc_owner->cr_uid;
521 ncs->group = ncp->nc_group;
522 ncs->flags = ncp->flags;
523 ncs->buffer_size = ncp->buffer_size;
528 ncp_sysctl_connstat(SYSCTL_HANDLER_ARGS) {
530 struct ncp_conn_stat ncs;
531 struct ncp_conn *ncp;
532 /* struct ucred *cred = req->p->p_ucred;*/
535 ncp_conn_locklist(LK_SHARED, req->td);
536 error = SYSCTL_OUT(req, &ncp_conn_cnt, sizeof(ncp_conn_cnt));
537 SLIST_FOREACH(ncp, &conn_list, nc_next) {
539 /* I can't do conn_lock while list is locked */
542 ncp_conn_getinfo(ncp, &ncs);
544 bzero(&ncs,sizeof(ncs));
545 ncs.connRef = ncp->nc_id;
546 strcpy(ncs.li.server,"***");
549 error = SYSCTL_OUT(req, &ncs, sizeof(ncs));
551 ncp_conn_unlocklist(req->td);