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
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34 #include <sys/socket.h>
35 #include <sys/sysctl.h>
36
37 #include <net/if.h>
38 #include <net/if_var.h>
39 #include <net/if_private.h>
40 #include <net/if_mib.h>
41 #include <net/vnet.h>
42
43 /*
44 * A sysctl(3) MIB for generic interface information. This information
45 * is exported in the net.link.generic branch, which has the following
46 * structure:
47 *
48 * net.link.generic .system - system-wide control variables
49 * and statistics (node)
50 * .ifdata.<ifindex>.general
51 * - what's in `struct ifdata'
52 * plus some other info
53 * .ifdata.<ifindex>.linkspecific
54 * - a link-type-specific data
55 * structure (as might be used
56 * by an SNMP agent
57 *
58 * Perhaps someday we will make addresses accessible via this interface
59 * as well (then there will be four such...). The reason that the
60 * index comes before the last element in the name is because it
61 * seems more orthogonal that way, particularly with the possibility
62 * of other per-interface data living down here as well (e.g., integrated
63 * services stuff).
64 */
65
66 static int
sysctl_ifdata(SYSCTL_HANDLER_ARGS)67 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
68 {
69 int *name = (int *)arg1;
70 int error;
71 u_int namelen = arg2;
72 struct ifnet *ifp;
73 struct ifmibdata ifmd;
74 struct epoch_tracker et;
75 size_t dlen;
76 char *dbuf;
77
78 if (namelen != 2)
79 return EINVAL;
80 if (name[0] <= 0)
81 return (ENOENT);
82 NET_EPOCH_ENTER(et);
83 ifp = ifnet_byindex_ref(name[0]);
84 NET_EPOCH_EXIT(et);
85 if (ifp == NULL)
86 return (ENOENT);
87
88 switch(name[1]) {
89 default:
90 error = ENOENT;
91 goto out;
92
93 case IFDATA_GENERAL:
94 bzero(&ifmd, sizeof(ifmd));
95 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
96
97 ifmd.ifmd_pcount = ifp->if_pcount;
98 if_data_copy(ifp, &ifmd.ifmd_data);
99
100 ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
101 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
102 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
103 ifmd.ifmd_snd_drops =
104 ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS);
105
106 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
107 if (error)
108 goto out;
109 break;
110
111 case IFDATA_LINKSPECIFIC:
112 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
113 if (error || !req->newptr)
114 goto out;
115 break;
116
117 case IFDATA_DRIVERNAME:
118 /* 20 is enough for 64bit ints */
119 dlen = strlen(ifp->if_dname) + 20 + 1;
120 if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
121 error = ENOMEM;
122 goto out;
123 }
124 if (ifp->if_dunit == IF_DUNIT_NONE)
125 strcpy(dbuf, ifp->if_dname);
126 else
127 sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
128
129 error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
130 if (error == 0 && req->newptr != NULL)
131 error = EPERM;
132 free(dbuf, M_TEMP);
133 goto out;
134 }
135 out:
136 if_rele(ifp);
137 return error;
138 }
139
140 SYSCTL_DECL(_net_link_generic);
141 static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata,
142 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ifdata,
143 "Interface table");
144