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: releng/6.3/sys/net/if_mib.c 173886 2007-11-24 19:45:58Z cvs2svn $
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_DECL(_net_link_generic);
65 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
66 "Variables global to all interfaces");
67 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
68 &if_index, 0, "Number of configured interfaces");
69
70 static int
71 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
72 {
73 int *name = (int *)arg1;
74 int error;
75 u_int namelen = arg2;
76 struct ifnet *ifp;
77 struct ifmibdata ifmd;
78 size_t dlen;
79 char *dbuf;
80
81 if (namelen != 2)
82 return EINVAL;
83
84 if (name[0] <= 0 || name[0] > if_index ||
85 ifaddr_byindex(name[0]) == NULL)
86 return ENOENT;
87
88 ifp = ifaddr_byindex(name[0])->ifa_ifp;
89
90 switch(name[1]) {
91 default:
92 return ENOENT;
93
94 case IFDATA_GENERAL:
95 bzero(&ifmd, sizeof(ifmd));
96 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
97
98 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
99 COPY(pcount);
100 COPY(data);
101 #undef COPY
102 ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
103 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
104 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
105 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
106
107 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
108 if (error || !req->newptr)
109 return error;
110
111 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
112 if (error)
113 return error;
114
115 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
116 DONTCOPY(type);
117 DONTCOPY(physical);
118 DONTCOPY(addrlen);
119 DONTCOPY(hdrlen);
120 DONTCOPY(mtu);
121 DONTCOPY(metric);
122 DONTCOPY(baudrate);
123 #undef DONTCOPY
124 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
125 COPY(data);
126 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
127 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
128 #undef COPY
129 break;
130
131 case IFDATA_LINKSPECIFIC:
132 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
133 if (error || !req->newptr)
134 return error;
135
136 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
137 if (error)
138 return error;
139
140 case IFDATA_DRIVERNAME:
141 /* 20 is enough for 64bit ints */
142 dlen = strlen(ifp->if_dname) + 20 + 1;
143 if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL)
144 return (ENOMEM);
145 if (ifp->if_dunit == IF_DUNIT_NONE)
146 strcpy(dbuf, ifp->if_dname);
147 else
148 sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
149
150 error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
151 if (error == 0 && req->newptr != NULL)
152 error = EPERM;
153 free(dbuf, M_TEMP);
154 return (error);
155
156 }
157 return 0;
158 }
159
160 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
161 sysctl_ifdata, "Interface table");
162
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