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
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/malloc.h>
34#include <sys/socket.h>
35#include <sys/sysctl.h>
36
37#include <net/if.h>
38#include <net/if_var.h>
39#include <net/if_private.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
66static int
67sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
68{
69	int *name = (int *)arg1;
70	int error;
71	u_int namelen = arg2;
72	struct ifnet *ifp;
73	struct ifmibdata ifmd;
74	struct epoch_tracker et;
75	size_t dlen;
76	char *dbuf;
77
78	if (namelen != 2)
79		return EINVAL;
80	if (name[0] <= 0)
81		return (ENOENT);
82	NET_EPOCH_ENTER(et);
83	ifp = ifnet_byindex_ref(name[0]);
84	NET_EPOCH_EXIT(et);
85	if (ifp == NULL)
86		return (ENOENT);
87
88	switch(name[1]) {
89	default:
90		error = ENOENT;
91		goto out;
92
93	case IFDATA_GENERAL:
94		bzero(&ifmd, sizeof(ifmd));
95		strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
96
97		ifmd.ifmd_pcount = ifp->if_pcount;
98		if_data_copy(ifp, &ifmd.ifmd_data);
99
100		ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
101		ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
102		ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
103		ifmd.ifmd_snd_drops =
104		    ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS);
105
106		error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
107		if (error)
108			goto out;
109		break;
110
111	case IFDATA_LINKSPECIFIC:
112		error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
113		if (error || !req->newptr)
114			goto out;
115		break;
116
117	case IFDATA_DRIVERNAME:
118		/* 20 is enough for 64bit ints */
119		dlen = strlen(ifp->if_dname) + 20 + 1;
120		if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
121			error = ENOMEM;
122			goto out;
123		}
124		if (ifp->if_dunit == IF_DUNIT_NONE)
125			strcpy(dbuf, ifp->if_dname);
126		else
127			sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
128
129		error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
130		if (error == 0 && req->newptr != NULL)
131			error = EPERM;
132		free(dbuf, M_TEMP);
133		goto out;
134	}
135out:
136	if_rele(ifp);
137	return error;
138}
139
140SYSCTL_DECL(_net_link_generic);
141static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata,
142    CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_ifdata,
143    "Interface table");
144