if_mib.c revision 194739 
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 194739 2009-06-23 17:03:45Z bz $
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#include <net/vnet.h>
42
43/*
44 * A sysctl(3) MIB for generic interface information.  This information
45 * is exported in the net.link.generic branch, which has the following
46 * structure:
47 *
48 * net.link.generic	.system			- system-wide control variables
49 *						  and statistics (node)
50 *			.ifdata.<ifindex>.general
51 *						- what's in `struct ifdata'
52 *						  plus some other info
53 *			.ifdata.<ifindex>.linkspecific
54 *						- a link-type-specific data
55 *						  structure (as might be used
56 *						  by an SNMP agent
57 *
58 * Perhaps someday we will make addresses accessible via this interface
59 * as well (then there will be four such...).  The reason that the
60 * index comes before the last element in the name is because it
61 * seems more orthogonal that way, particularly with the possibility
62 * of other per-interface data living down here as well (e.g., integrated
63 * services stuff).
64 */
65
66SYSCTL_DECL(_net_link_generic);
67SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
68	    "Variables global to all interfaces");
69
70SYSCTL_V_INT(V_NET, vnet_net, _net_link_generic_system, IFMIB_IFCOUNT,
71	     ifcount, CTLFLAG_RD, if_index, 0,
72	     "Number of configured interfaces");
73
74static int
75sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
76{
77	int *name = (int *)arg1;
78	int error;
79	u_int namelen = arg2;
80	struct ifnet *ifp;
81	struct ifmibdata ifmd;
82	size_t dlen;
83	char *dbuf;
84
85	if (namelen != 2)
86		return EINVAL;
87	if (name[0] <= 0)
88		return (ENOENT);
89	ifp = ifnet_byindex_ref(name[0]);
90	if (ifp == NULL)
91		return (ENOENT);
92
93	switch(name[1]) {
94	default:
95		error = ENOENT;
96		goto out;
97
98	case IFDATA_GENERAL:
99		bzero(&ifmd, sizeof(ifmd));
100		strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
101
102#define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
103		COPY(pcount);
104		COPY(data);
105#undef COPY
106		ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
107		ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
108		ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
109		ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
110
111		error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
112		if (error || !req->newptr)
113			goto out;
114
115		error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
116		if (error)
117			goto out;
118
119#define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
120		DONTCOPY(type);
121		DONTCOPY(physical);
122		DONTCOPY(addrlen);
123		DONTCOPY(hdrlen);
124		DONTCOPY(mtu);
125		DONTCOPY(metric);
126		DONTCOPY(baudrate);
127#undef DONTCOPY
128#define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
129		COPY(data);
130		ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
131		ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
132#undef COPY
133		break;
134
135	case IFDATA_LINKSPECIFIC:
136		error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
137		if (error || !req->newptr)
138			goto out;
139
140		error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
141		if (error)
142			goto out;
143		break;
144
145	case IFDATA_DRIVERNAME:
146		/* 20 is enough for 64bit ints */
147		dlen = strlen(ifp->if_dname) + 20 + 1;
148		if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
149			error = ENOMEM;
150			goto out;
151		}
152		if (ifp->if_dunit == IF_DUNIT_NONE)
153			strcpy(dbuf, ifp->if_dname);
154		else
155			sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
156
157		error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
158		if (error == 0 && req->newptr != NULL)
159			error = EPERM;
160		free(dbuf, M_TEMP);
161		goto out;
162	}
163out:
164	if_rele(ifp);
165	return error;
166}
167
168SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
169	    sysctl_ifdata, "Interface table");
170
171