if_mib.c revision 154023 
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: head/sys/net/if_mib.c 154023 2006-01-04 12:57:09Z harti $
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
64SYSCTL_DECL(_net_link_generic);
65SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
66	    "Variables global to all interfaces");
67SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
68	   &if_index, 0, "Number of configured interfaces");
69
70static int
71sysctl_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	    ifnet_byindex(name[0]) == NULL)
86		return ENOENT;
87
88	ifp = ifnet_byindex(name[0]);
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	return 0;
157}
158
159SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
160	    sysctl_ifdata, "Interface table");
161
162