1/*
2 * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * Copyright 1996 Massachusetts Institute of Technology
30 *
31 * Permission to use, copy, modify, and distribute this software and
32 * its documentation for any purpose and without fee is hereby
33 * granted, provided that both the above copyright notice and this
34 * permission notice appear in all copies, that both the above
35 * copyright notice and this permission notice appear in all
36 * supporting documentation, and that the name of M.I.T. not be used
37 * in advertising or publicity pertaining to distribution of the
38 * software without specific, written prior permission.  M.I.T. makes
39 * no representations about the suitability of this software for any
40 * purpose.  It is provided "as is" without express or implied
41 * warranty.
42 *
43 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
44 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
45 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
46 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
47 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
50 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
51 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
52 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
53 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
54 * SUCH DAMAGE.
55 *
56 * $FreeBSD: src/sys/net/if_mib.c,v 1.8.2.1 2000/08/03 00:09:34 ps Exp $
57 */
58
59#include <sys/param.h>
60#include <sys/systm.h>
61#include <sys/kernel.h>
62#include <sys/socket.h>
63#include <sys/sysctl.h>
64#include <sys/systm.h>
65
66#include <net/if.h>
67#include <net/if_mib.h>
68#include <net/if_var.h>
69
70/*
71 * A sysctl(3) MIB for generic interface information.  This information
72 * is exported in the net.link.generic branch, which has the following
73 * structure:
74 *
75 * net.link.generic	.system			- system-wide control variables
76 *						  and statistics (node)
77 *			.ifdata.<ifindex>.general
78 *						- what's in `struct ifdata'
79 *						  plus some other info
80 *			.ifdata.<ifindex>.linkspecific
81 *						- a link-type-specific data
82 *						  structure (as might be used
83 *						  by an SNMP agent
84 *
85 * Perhaps someday we will make addresses accessible via this interface
86 * as well (then there will be four such...).  The reason that the
87 * index comes before the last element in the name is because it
88 * seems more orthogonal that way, particularly with the possibility
89 * of other per-interface data living down here as well (e.g., integrated
90 * services stuff).
91 */
92
93SYSCTL_DECL(_net_link_generic);
94
95SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RD|CTLFLAG_LOCKED, 0,
96	    "Variables global to all interfaces");
97
98SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD | CTLFLAG_LOCKED,
99	   &if_index, 0, "Number of configured interfaces");
100
101static int sysctl_ifdata SYSCTL_HANDLER_ARGS;
102SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RD | CTLFLAG_LOCKED,
103            sysctl_ifdata, "Interface table");
104
105static int sysctl_ifalldata SYSCTL_HANDLER_ARGS;
106SYSCTL_NODE(_net_link_generic, IFMIB_IFALLDATA, ifalldata, CTLFLAG_RD | CTLFLAG_LOCKED,
107            sysctl_ifalldata, "Interface table");
108
109static int make_ifmibdata(struct ifnet *, int *, struct sysctl_req *);
110
111int
112make_ifmibdata(struct ifnet *ifp, int *name, struct sysctl_req *req)
113{
114	struct ifmibdata	ifmd;
115	int error = 0;
116
117	switch(name[1]) {
118	default:
119		error = ENOENT;
120		break;
121
122	case IFDATA_GENERAL:
123		bzero(&ifmd, sizeof(ifmd));
124		/*
125		 * Make sure the interface is in use
126		 */
127		if (ifnet_is_attached(ifp, 0)) {
128			snprintf(ifmd.ifmd_name, sizeof(ifmd.ifmd_name), "%s",
129				if_name(ifp));
130
131#define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
132			COPY(pcount);
133			COPY(flags);
134			if_data_internal_to_if_data64(ifp, &ifp->if_data, &ifmd.ifmd_data);
135#undef COPY
136			ifmd.ifmd_snd_len = IFCQ_LEN(&ifp->if_snd);
137			ifmd.ifmd_snd_maxlen = IFCQ_MAXLEN(&ifp->if_snd);
138			ifmd.ifmd_snd_drops = ifp->if_snd.ifcq_dropcnt.packets;
139		}
140		error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
141		if (error || !req->newptr)
142			break;
143
144#ifdef IF_MIB_WR
145		error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
146		if (error)
147			break;
148
149#define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
150		DONTCOPY(type);
151		DONTCOPY(physical);
152		DONTCOPY(addrlen);
153		DONTCOPY(hdrlen);
154		DONTCOPY(mtu);
155		DONTCOPY(metric);
156		DONTCOPY(baudrate);
157#undef DONTCOPY
158#define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
159		COPY(data);
160		ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
161		ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
162#undef COPY
163#endif /* IF_MIB_WR */
164		break;
165
166	case IFDATA_LINKSPECIFIC:
167		error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
168		if (error || !req->newptr)
169			break;
170
171#ifdef IF_MIB_WR
172		error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
173		if (error)
174			break;
175#endif /* IF_MIB_WR */
176		break;
177
178	case IFDATA_SUPPLEMENTAL: {
179		struct ifmibdata_supplemental *ifmd_supp;
180
181		if ((ifmd_supp = _MALLOC(sizeof (*ifmd_supp), M_TEMP,
182		    M_NOWAIT | M_ZERO)) == NULL) {
183			error = ENOMEM;
184			break;
185		}
186
187		if_copy_traffic_class(ifp, &ifmd_supp->ifmd_traffic_class);
188		if_copy_data_extended(ifp, &ifmd_supp->ifmd_data_extended);
189		if_copy_packet_stats(ifp, &ifmd_supp->ifmd_packet_stats);
190		if_copy_rxpoll_stats(ifp, &ifmd_supp->ifmd_rxpoll_stats);
191
192		if (req->oldptr == USER_ADDR_NULL)
193			req->oldlen = sizeof (*ifmd_supp);
194
195		error = SYSCTL_OUT(req, ifmd_supp, MIN(sizeof (*ifmd_supp),
196		    req->oldlen));
197
198		_FREE(ifmd_supp, M_TEMP);
199		break;
200	}
201	}
202
203	return error;
204}
205
206int
207sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
208{
209#pragma unused(oidp)
210	int *name = (int *)arg1;
211	int error = 0;
212	u_int namelen = arg2;
213	struct ifnet *ifp;
214
215	if (namelen != 2)
216		return (EINVAL);
217
218	ifnet_head_lock_shared();
219	if (name[0] <= 0 || name[0] > if_index ||
220	    (ifp = ifindex2ifnet[name[0]]) == NULL) {
221		ifnet_head_done();
222		return (ENOENT);
223	}
224	ifnet_reference(ifp);
225	ifnet_head_done();
226
227	ifnet_lock_shared(ifp);
228	error = make_ifmibdata(ifp, name, req);
229	ifnet_lock_done(ifp);
230
231	ifnet_release(ifp);
232
233	return (error);
234}
235
236int
237sysctl_ifalldata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
238{
239#pragma unused(oidp)
240	int *name = (int *)arg1;
241	int error = 0;
242	u_int namelen = arg2;
243	struct ifnet *ifp;
244
245	if (namelen != 2)
246		return (EINVAL);
247
248	ifnet_head_lock_shared();
249	TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
250		ifnet_lock_shared(ifp);
251
252		error = make_ifmibdata(ifp, name, req);
253
254		ifnet_lock_done(ifp);
255		if (error != 0)
256			break;
257	}
258	ifnet_head_done();
259	return error;
260}
261