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/socket.h>
36 #include <sys/sysctl.h>
37
38 #include <net/if.h>
39 #include <net/if_mib.h>
40
41 /*
42 * A sysctl(3) MIB for generic interface information. This information
43 * is exported in the net.link.generic branch, which has the following
44 * structure:
45 *
46 * net.link.generic .system - system-wide control variables
47 * and statistics (node)
48 * .ifdata.<ifindex>.general
49 * - what's in `struct ifdata'
50 * plus some other info
51 * .ifdata.<ifindex>.linkspecific
52 * - a link-type-specific data
53 * structure (as might be used
54 * by an SNMP agent
55 *
56 * Perhaps someday we will make addresses accessible via this interface
57 * as well (then there will be four such...). The reason that the
58 * index comes before the last element in the name is because it
59 * seems more orthogonal that way, particularly with the possibility
60 * of other per-interface data living down here as well (e.g., integrated
61 * services stuff).
62 */
63
64 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
65 "Variables global to all interfaces");
66 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
67 &if_index, 0, "Number of configured interfaces");
68
69 static int
70 sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
71 {
72 int *name = (int *)arg1;
73 int error, ifnlen;
74 u_int namelen = arg2;
75 struct ifnet *ifp;
76 char workbuf[64];
77 struct ifmibdata ifmd;
78
79 if (namelen != 2)
80 return EINVAL;
81
82 if (name[0] <= 0 || name[0] > if_index)
83 return ENOENT;
84
85 ifp = ifnet_addrs[name[0] - 1]->ifa_ifp;
86
87 switch(name[1]) {
88 default:
89 return ENOENT;
90
91 case IFDATA_GENERAL:
92 ifnlen = snprintf(workbuf, sizeof(workbuf),
93 "%s%d", ifp->if_name, ifp->if_unit);
94 if(ifnlen + 1 > sizeof ifmd.ifmd_name) {
95 return ENAMETOOLONG;
96 } else {
97 strcpy(ifmd.ifmd_name, workbuf);
98 }
99
100 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
101 COPY(pcount);
102 COPY(flags);
103 COPY(data);
104 #undef COPY
105 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
106 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
107 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
108
109 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
110 if (error || !req->newptr)
111 return error;
112
113 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
114 if (error)
115 return error;
116
117 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
118 DONTCOPY(type);
119 DONTCOPY(physical);
120 DONTCOPY(addrlen);
121 DONTCOPY(hdrlen);
122 DONTCOPY(mtu);
123 DONTCOPY(metric);
124 DONTCOPY(baudrate);
125 #undef DONTCOPY
126 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
127 COPY(data);
128 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
129 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
130 #undef COPY
131 break;
132
133 case IFDATA_LINKSPECIFIC:
134 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
135 if (error || !req->newptr)
136 return error;
137
138 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
139 if (error)
140 return error;
141
142 }
143 return 0;
144 }
145
146 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
147 sysctl_ifdata, "Interface table");
148
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