FreeBSD/Linux Kernel Cross Reference
sys/net/if_mib.c
1 /*-
2 * Copyright 1996 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission. M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose. It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/socket.h>
37 #include <sys/sysctl.h>
38
39 #include <net/if.h>
40 #include <net/if_var.h>
41 #include <net/if_mib.h>
42 #include <net/vnet.h>
43
44 /*
45 * A sysctl(3) MIB for generic interface information. This information
46 * is exported in the net.link.generic branch, which has the following
47 * structure:
48 *
49 * net.link.generic .system - system-wide control variables
50 * and statistics (node)
51 * .ifdata.<ifindex>.general
52 * - what's in `struct ifdata'
53 * plus some other info
54 * .ifdata.<ifindex>.linkspecific
55 * - a link-type-specific data
56 * structure (as might be used
57 * by an SNMP agent
58 *
59 * Perhaps someday we will make addresses accessible via this interface
60 * as well (then there will be four such...). The reason that the
61 * index comes before the last element in the name is because it
62 * seems more orthogonal that way, particularly with the possibility
63 * of other per-interface data living down here as well (e.g., integrated
64 * services stuff).
65 */
66
67 SYSCTL_DECL(_net_link_generic);
68 static SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
69 "Variables global to all interfaces");
70
71 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount,
72 CTLFLAG_VNET | CTLFLAG_RD, &VNET_NAME(if_index), 0,
73 "Number of configured interfaces");
74
75 static int
76 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
77 {
78 int *name = (int *)arg1;
79 int error;
80 u_int namelen = arg2;
81 struct ifnet *ifp;
82 struct ifmibdata ifmd;
83 size_t dlen;
84 char *dbuf;
85
86 if (namelen != 2)
87 return EINVAL;
88 if (name[0] <= 0)
89 return (ENOENT);
90 ifp = ifnet_byindex_ref(name[0]);
91 if (ifp == NULL)
92 return (ENOENT);
93
94 switch(name[1]) {
95 default:
96 error = ENOENT;
97 goto out;
98
99 case IFDATA_GENERAL:
100 bzero(&ifmd, sizeof(ifmd));
101 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
102
103 ifmd.ifmd_pcount = ifp->if_pcount;
104 if_data_copy(ifp, &ifmd.ifmd_data);
105
106 ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
107 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
108 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
109 ifmd.ifmd_snd_drops =
110 ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS);
111
112 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
113 if (error)
114 goto out;
115 break;
116
117 case IFDATA_LINKSPECIFIC:
118 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
119 if (error || !req->newptr)
120 goto out;
121
122 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
123 if (error)
124 goto out;
125 break;
126
127 case IFDATA_DRIVERNAME:
128 /* 20 is enough for 64bit ints */
129 dlen = strlen(ifp->if_dname) + 20 + 1;
130 if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
131 error = ENOMEM;
132 goto out;
133 }
134 if (ifp->if_dunit == IF_DUNIT_NONE)
135 strcpy(dbuf, ifp->if_dname);
136 else
137 sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
138
139 error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
140 if (error == 0 && req->newptr != NULL)
141 error = EPERM;
142 free(dbuf, M_TEMP);
143 goto out;
144 }
145 out:
146 if_rele(ifp);
147 return error;
148 }
149
150 static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
151 sysctl_ifdata, "Interface table");
152
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