if_mib.c revision 182904 
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 182904 2008-09-10 13:08:37Z bms $
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#include <sys/vimage.h>
38
39#include <net/if.h>
40#include <net/if_mib.h>
41
42/*
43 * A sysctl(3) MIB for generic interface information.  This information
44 * is exported in the net.link.generic branch, which has the following
45 * structure:
46 *
47 * net.link.generic	.system			- system-wide control variables
48 *						  and statistics (node)
49 *			.ifdata.<ifindex>.general
50 *						- what's in `struct ifdata'
51 *						  plus some other info
52 *			.ifdata.<ifindex>.linkspecific
53 *						- a link-type-specific data
54 *						  structure (as might be used
55 *						  by an SNMP agent
56 *
57 * Perhaps someday we will make addresses accessible via this interface
58 * as well (then there will be four such...).  The reason that the
59 * index comes before the last element in the name is because it
60 * seems more orthogonal that way, particularly with the possibility
61 * of other per-interface data living down here as well (e.g., integrated
62 * services stuff).
63 */
64
65SYSCTL_DECL(_net_link_generic);
66SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
67	    "Variables global to all interfaces");
68SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
69	   &if_index, 0, "Number of configured interfaces");
70
71static int
72sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
73{
74	int *name = (int *)arg1;
75	int error;
76	u_int namelen = arg2;
77	struct ifnet *ifp;
78	struct ifmibdata ifmd;
79	size_t dlen;
80	char *dbuf;
81
82	if (namelen != 2)
83		return EINVAL;
84
85	if (name[0] <= 0 || name[0] > V_if_index ||
86	    ifnet_byindex(name[0]) == NULL)
87		return ENOENT;
88
89	ifp = ifnet_byindex(name[0]);
90
91	switch(name[1]) {
92	default:
93		return ENOENT;
94
95	case IFDATA_GENERAL:
96		bzero(&ifmd, sizeof(ifmd));
97		strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
98
99#define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
100		COPY(pcount);
101		COPY(data);
102#undef COPY
103		ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
104		ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
105		ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
106		ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
107
108		error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
109		if (error || !req->newptr)
110			return error;
111
112		error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
113		if (error)
114			return error;
115
116#define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
117		DONTCOPY(type);
118		DONTCOPY(physical);
119		DONTCOPY(addrlen);
120		DONTCOPY(hdrlen);
121		DONTCOPY(mtu);
122		DONTCOPY(metric);
123		DONTCOPY(baudrate);
124#undef DONTCOPY
125#define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
126		COPY(data);
127		ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
128		ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
129#undef COPY
130		break;
131
132	case IFDATA_LINKSPECIFIC:
133		error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
134		if (error || !req->newptr)
135			return error;
136
137		error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
138		if (error)
139			return error;
140		break;
141
142	case IFDATA_DRIVERNAME:
143		/* 20 is enough for 64bit ints */
144		dlen = strlen(ifp->if_dname) + 20 + 1;
145		if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL)
146			return (ENOMEM);
147		if (ifp->if_dunit == IF_DUNIT_NONE)
148			strcpy(dbuf, ifp->if_dname);
149		else
150			sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
151
152		error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
153		if (error == 0 && req->newptr != NULL)
154			error = EPERM;
155		free(dbuf, M_TEMP);
156		return (error);
157	}
158	return 0;
159}
160
161SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
162	    sysctl_ifdata, "Interface table");
163
164