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
devipnet_fill_vattr(struct vattr * vap,dev_t dev)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
devipnet_validate(struct sdev_node * dv)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
devipnet_create_rvp(struct sdev_node * ddv,char * nm,void ** arg,cred_t * cred,void * whatever,char * whichever)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
devipnet_lookup(struct vnode * dvp,char * nm,struct vnode ** vpp,struct pathname * pnp,int flags,struct vnode * rdir,struct cred * cred,caller_context_t * ct,int * direntflags,pathname_t * realpnp)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
devipnet_filldir_entry(const char * name,void * arg,dev_t dev)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
devipnet_filldir(struct sdev_node * ddv)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
166 for (dv = SDEV_FIRST_ENTRY(ddv); dv; dv = next) {
167 next = SDEV_NEXT_ENTRY(ddv, dv);
168
169 /* validate and prune only ready nodes */
170 if (dv->sdev_state != SDEV_READY)
171 continue;
172 switch (devipnet_validate(dv)) {
173 case SDEV_VTOR_VALID:
174 case SDEV_VTOR_SKIP:
175 continue;
176 case SDEV_VTOR_INVALID:
177 case SDEV_VTOR_STALE:
178 sdcmn_err12(("devipnet_filldir: destroy invalid "
179 "node: %s(%p)\n", dv->sdev_name, (void *)dv));
180 break;
181 }
182
183 if (SDEVTOV(dv)->v_count > 0)
184 continue;
185 SDEV_HOLD(dv);
186 /* remove the cache node */
187 (void) sdev_cache_update(ddv, &dv, dv->sdev_name,
188 SDEV_CACHE_DELETE);
189 }
190
191 ipnet_walk_if(devipnet_filldir_entry, ddv, getzoneid());
192
193 rw_downgrade(&ddv->sdev_contents);
194 }
195
196 /*
197 * Display all instantiated ipnet device nodes.
198 */
199 /* ARGSUSED */
200 static int
devipnet_readdir(struct vnode * dvp,struct uio * uiop,struct cred * cred,int * eofp,caller_context_t * ct,int flags)201 devipnet_readdir(struct vnode *dvp, struct uio *uiop, struct cred *cred,
202 int *eofp, caller_context_t *ct, int flags)
203 {
204 struct sdev_node *sdvp = VTOSDEV(dvp);
205
206 if (uiop->uio_offset == 0)
207 devipnet_filldir(sdvp);
208
209 return (devname_readdir_func(dvp, uiop, cred, eofp, 0));
210 }
211
212 /*
213 * We override lookup and readdir to build entries based on the
214 * in kernel ipnet table.
215 */
216 const fs_operation_def_t devipnet_vnodeops_tbl[] = {
217 VOPNAME_READDIR, { .vop_readdir = devipnet_readdir },
218 VOPNAME_LOOKUP, { .vop_lookup = devipnet_lookup },
219 VOPNAME_CREATE, { .error = fs_nosys },
220 VOPNAME_REMOVE, { .error = fs_nosys },
221 VOPNAME_MKDIR, { .error = fs_nosys },
222 VOPNAME_RMDIR, { .error = fs_nosys },
223 VOPNAME_SYMLINK, { .error = fs_nosys },
224 VOPNAME_SETSECATTR, { .error = fs_nosys },
225 NULL, NULL
226 };
227