1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * vnode ops for the /dev/ipnet directory
28 * The lookup is based on the ipnetif nodes held
29 * in the ipnet module. We also override readdir
30 * in order to delete ipnet nodes no longer in use.
31 */
32
33 #include <sys/types.h>
34 #include <sys/param.h>
35 #include <sys/sysmacros.h>
36 #include <sys/sunndi.h>
37 #include <fs/fs_subr.h>
38 #include <sys/fs/dv_node.h>
39 #include <sys/fs/sdev_impl.h>
40 #include <sys/policy.h>
41 #include <inet/ipnet.h>
42 #include <sys/zone.h>
43
44 struct vnodeops *devipnet_vnodeops;
45
46 static void
47 devipnet_fill_vattr(struct vattr *vap, dev_t dev)
48 {
49 timestruc_t now;
50
51 *vap = sdev_vattr_chr;
52 vap->va_rdev = dev;
53 vap->va_mode |= 0666;
54
55 gethrestime(&now);
56 vap->va_atime = now;
57 vap->va_mtime = now;
58 vap->va_ctime = now;
59 }
60
61 /*
62 * Check if an ipnet sdev_node is still valid.
63 */
64 int
65 devipnet_validate(struct sdev_node *dv)
66 {
67 dev_t dev;
68
69 dev = ipnet_if_getdev(dv->sdev_name, getzoneid());
70 if (dev == (dev_t)-1)
71 return (SDEV_VTOR_INVALID);
72 if (getminor(SDEVTOV(dv)->v_rdev) != getminor(dev))
73 return (SDEV_VTOR_STALE);
74 return (SDEV_VTOR_VALID);
75 }
76
77 /*
78 * This callback is invoked from devname_lookup_func() to create
79 * an ipnet entry when the node is not found in the cache.
80 */
81 /*ARGSUSED*/
82 static int
83 devipnet_create_rvp(struct sdev_node *ddv, char *nm,
84 void **arg, cred_t *cred, void *whatever, char *whichever)
85 {
86 dev_t dev;
87 struct vattr *vap = (struct vattr *)arg;
88 int err = 0;
89
90 if ((dev = ipnet_if_getdev(nm, getzoneid())) == (dev_t)-1)
91 err = ENOENT;
92 else
93 devipnet_fill_vattr(vap, dev);
94
95 return (err);
96 }
97
98 /*
99 * Lookup for /dev/ipnet directory
100 * If the entry does not exist, the devipnet_create_rvp() callback
101 * is invoked to create it. Nodes do not persist across reboot.
102 */
103 /*ARGSUSED3*/
104 static int
105 devipnet_lookup(struct vnode *dvp, char *nm, struct vnode **vpp,
106 struct pathname *pnp, int flags, struct vnode *rdir, struct cred *cred,
107 caller_context_t *ct, int *direntflags, pathname_t *realpnp)
108 {
109 struct sdev_node *sdvp = VTOSDEV(dvp);
110 struct sdev_node *dv;
111 struct vnode *rvp = NULL;
112 int error;
113
114 error = devname_lookup_func(sdvp, nm, vpp, cred, devipnet_create_rvp,
115 SDEV_VATTR);
116
117 if (error == 0) {
118 switch ((*vpp)->v_type) {
119 case VCHR:
120 dv = VTOSDEV(VTOS(*vpp)->s_realvp);
121 ASSERT(VOP_REALVP(SDEVTOV(dv), &rvp, NULL) == ENOSYS);
122 break;
123 case VDIR:
124 dv = VTOSDEV(*vpp);
125 break;
126 default:
127 cmn_err(CE_PANIC, "devipnet_lookup: Unsupported node "
128 "type: %p: %d", (void *)(*vpp), (*vpp)->v_type);
129 break;
130 }
131 ASSERT(SDEV_HELD(dv));
132 }
133
134 return (error);
135 }
136
137 static void
138 devipnet_filldir_entry(const char *name, void *arg, dev_t dev)
139 {
140 struct sdev_node *ddv = arg;
141 struct vattr vattr;
142 struct sdev_node *dv;
143
144 ASSERT(RW_WRITE_HELD(&ddv->sdev_contents));
145
146 if ((dv = sdev_cache_lookup(ddv, (char *)name)) == NULL) {
147 devipnet_fill_vattr(&vattr, dev);
148 if (sdev_mknode(ddv, (char *)name, &dv, &vattr, NULL, NULL,
149 kcred, SDEV_READY) != 0)
150 return;
151 }
152 SDEV_SIMPLE_RELE(dv);
153 }
154
155 static void
156 devipnet_filldir(struct sdev_node *ddv)
157 {
158 sdev_node_t *dv, *next;
159
160 ASSERT(RW_READ_HELD(&ddv->sdev_contents));
161 if (rw_tryupgrade(&ddv->sdev_contents) == NULL) {
162 rw_exit(&ddv->sdev_contents);
163 rw_enter(&ddv->sdev_contents, RW_WRITER);
164 /*
165 * We've been made a zombie while we weren't looking. We'll bail
166 * if that's the case.
167 */
168 if (ddv->sdev_state == SDEV_ZOMBIE) {
169 rw_exit(&ddv->sdev_contents);
170 return;
171 }
172 }
173
174 for (dv = SDEV_FIRST_ENTRY(ddv); dv; dv = next) {
175 next = SDEV_NEXT_ENTRY(ddv, dv);
176
177 /* validate and prune only ready nodes */
178 if (dv->sdev_state != SDEV_READY)
179 continue;
180 switch (devipnet_validate(dv)) {
181 case SDEV_VTOR_VALID:
182 case SDEV_VTOR_SKIP:
183 continue;
184 case SDEV_VTOR_INVALID:
185 case SDEV_VTOR_STALE:
186 sdcmn_err12(("devipnet_filldir: destroy invalid "
187 "node: %s(%p)\n", dv->sdev_name, (void *)dv));
188 break;
189 }
190
191 if (SDEVTOV(dv)->v_count > 0)
192 continue;
193 SDEV_HOLD(dv);
194 /* remove the cache node */
195 (void) sdev_cache_update(ddv, &dv, dv->sdev_name,
196 SDEV_CACHE_DELETE);
197 SDEV_RELE(dv);
198 }
199
200 ipnet_walk_if(devipnet_filldir_entry, ddv, getzoneid());
201
202 rw_downgrade(&ddv->sdev_contents);
203 }
204
205 /*
206 * Display all instantiated ipnet device nodes.
207 */
208 /* ARGSUSED */
209 static int
210 devipnet_readdir(struct vnode *dvp, struct uio *uiop, struct cred *cred,
211 int *eofp, caller_context_t *ct, int flags)
212 {
213 struct sdev_node *sdvp = VTOSDEV(dvp);
214
215 if (uiop->uio_offset == 0)
216 devipnet_filldir(sdvp);
217
218 return (devname_readdir_func(dvp, uiop, cred, eofp, 0));
219 }
220
221 /*
222 * We override lookup and readdir to build entries based on the
223 * in kernel ipnet table.
224 */
225 const fs_operation_def_t devipnet_vnodeops_tbl[] = {
226 VOPNAME_READDIR, { .vop_readdir = devipnet_readdir },
227 VOPNAME_LOOKUP, { .vop_lookup = devipnet_lookup },
228 VOPNAME_CREATE, { .error = fs_nosys },
229 VOPNAME_REMOVE, { .error = fs_nosys },
230 VOPNAME_MKDIR, { .error = fs_nosys },
231 VOPNAME_RMDIR, { .error = fs_nosys },
232 VOPNAME_SYMLINK, { .error = fs_nosys },
233 VOPNAME_SETSECATTR, { .error = fs_nosys },
234 NULL, NULL
235 };