if_mib.c revision 193744 
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 193744 2009-06-08 19:57:35Z 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/route.h>
42#include <net/vnet.h>
43
44/*
45 * A sysctl(3) MIB for generic interface information.  This information
46 * is exported in the net.link.generic branch, which has the following
47 * structure:
48 *
49 * net.link.generic	.system			- system-wide control variables
50 *						  and statistics (node)
51 *			.ifdata.<ifindex>.general
52 *						- what's in `struct ifdata'
53 *						  plus some other info
54 *			.ifdata.<ifindex>.linkspecific
55 *						- a link-type-specific data
56 *						  structure (as might be used
57 *						  by an SNMP agent
58 *
59 * Perhaps someday we will make addresses accessible via this interface
60 * as well (then there will be four such...).  The reason that the
61 * index comes before the last element in the name is because it
62 * seems more orthogonal that way, particularly with the possibility
63 * of other per-interface data living down here as well (e.g., integrated
64 * services stuff).
65 */
66
67SYSCTL_DECL(_net_link_generic);
68SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
69	    "Variables global to all interfaces");
70
71SYSCTL_V_INT(V_NET, vnet_net, _net_link_generic_system, IFMIB_IFCOUNT,
72	     ifcount, CTLFLAG_RD, if_index, 0,
73	     "Number of configured interfaces");
74
75static int
76sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
77{
78	int *name = (int *)arg1;
79	int error;
80	u_int namelen = arg2;
81	struct ifnet *ifp;
82	struct ifmibdata ifmd;
83	size_t dlen;
84	char *dbuf;
85
86	if (namelen != 2)
87		return EINVAL;
88	if (name[0] <= 0)
89		return (ENOENT);
90	ifp = ifnet_byindex_ref(name[0]);
91	if (ifp == NULL)
92		return (ENOENT);
93
94	switch(name[1]) {
95	default:
96		error = ENOENT;
97		goto out;
98
99	case IFDATA_GENERAL:
100		bzero(&ifmd, sizeof(ifmd));
101		strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
102
103#define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
104		COPY(pcount);
105		COPY(data);
106#undef COPY
107		ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
108		ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
109		ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
110		ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
111
112		error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
113		if (error || !req->newptr)
114			goto out;
115
116		error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
117		if (error)
118			goto out;
119
120#define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
121		DONTCOPY(type);
122		DONTCOPY(physical);
123		DONTCOPY(addrlen);
124		DONTCOPY(hdrlen);
125		DONTCOPY(mtu);
126		DONTCOPY(metric);
127		DONTCOPY(baudrate);
128#undef DONTCOPY
129#define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
130		COPY(data);
131		ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
132		ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
133#undef COPY
134		break;
135
136	case IFDATA_LINKSPECIFIC:
137		error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
138		if (error || !req->newptr)
139			goto out;
140
141		error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
142		if (error)
143			goto out;
144		break;
145
146	case IFDATA_DRIVERNAME:
147		/* 20 is enough for 64bit ints */
148		dlen = strlen(ifp->if_dname) + 20 + 1;
149		if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
150			error = ENOMEM;
151			goto out;
152		}
153		if (ifp->if_dunit == IF_DUNIT_NONE)
154			strcpy(dbuf, ifp->if_dname);
155		else
156			sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
157
158		error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
159		if (error == 0 && req->newptr != NULL)
160			error = EPERM;
161		free(dbuf, M_TEMP);
162		goto out;
163	}
164out:
165	if_rele(ifp);
166	return error;
167}
168
169SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
170	    sysctl_ifdata, "Interface table");
171
172