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#include <net/vnet.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);
66static SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
67	    "Variables global to all interfaces");
68
69SYSCTL_VNET_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
70	    &VNET_NAME(if_index), 0,
71	     "Number of configured interfaces");
72
73static int
74sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
75{
76	int *name = (int *)arg1;
77	int error;
78	u_int namelen = arg2;
79	struct ifnet *ifp;
80	struct ifmibdata ifmd;
81	size_t dlen;
82	char *dbuf;
83
84	if (namelen != 2)
85		return EINVAL;
86	if (name[0] <= 0)
87		return (ENOENT);
88	ifp = ifnet_byindex_ref(name[0]);
89	if (ifp == NULL)
90		return (ENOENT);
91
92	switch(name[1]) {
93	default:
94		error = ENOENT;
95		goto out;
96
97	case IFDATA_GENERAL:
98		bzero(&ifmd, sizeof(ifmd));
99		strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
100
101#define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
102		COPY(pcount);
103		COPY(data);
104#undef COPY
105		ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
106		ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
107		ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
108		ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
109
110		error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
111		if (error || !req->newptr)
112			goto out;
113
114		error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
115		if (error)
116			goto out;
117
118#define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
119		DONTCOPY(type);
120		DONTCOPY(physical);
121		DONTCOPY(addrlen);
122		DONTCOPY(hdrlen);
123		DONTCOPY(mtu);
124		DONTCOPY(metric);
125		DONTCOPY(baudrate);
126#undef DONTCOPY
127#define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
128		COPY(data);
129		ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
130		ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
131#undef COPY
132		break;
133
134	case IFDATA_LINKSPECIFIC:
135		error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
136		if (error || !req->newptr)
137			goto out;
138
139		error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
140		if (error)
141			goto out;
142		break;
143
144	case IFDATA_DRIVERNAME:
145		/* 20 is enough for 64bit ints */
146		dlen = strlen(ifp->if_dname) + 20 + 1;
147		if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
148			error = ENOMEM;
149			goto out;
150		}
151		if (ifp->if_dunit == IF_DUNIT_NONE)
152			strcpy(dbuf, ifp->if_dname);
153		else
154			sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
155
156		error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
157		if (error == 0 && req->newptr != NULL)
158			error = EPERM;
159		free(dbuf, M_TEMP);
160		goto out;
161	}
162out:
163	if_rele(ifp);
164	return error;
165}
166
167static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
168	    sysctl_ifdata, "Interface table");
169
170