1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29#include "opt_inet.h"
30#include "opt_inet6.h"
31#include <sys/types.h>
32#include <sys/malloc.h>
33#include <sys/socket.h>
34#include <sys/sockio.h>
35#include <sys/syslog.h>
36#include <sys/socketvar.h>
37
38#include <net/ethernet.h>
39#include <net/if.h>
40#include <net/if_dl.h>
41#include <net/if_media.h>
42#include <net/if_var.h>
43#include <net/if_clone.h>
44#include <net/if_vlan_var.h>
45#include <net/route.h>
46#include <net/route/nhop.h>
47#include <net/route/route_ctl.h>
48#include <netlink/netlink.h>
49#include <netlink/netlink_ctl.h>
50#include <netlink/netlink_route.h>
51#include <netlink/route/route_var.h>
52
53#include <netinet6/scope6_var.h> /* scope deembedding */
54
55#define	DEBUG_MOD_NAME	nl_iface_drivers
56#define	DEBUG_MAX_LEVEL	LOG_DEBUG3
57#include <netlink/netlink_debug.h>
58_DECLARE_DEBUG(LOG_INFO);
59
60/*
61 * Generic modification interface handler.
62 * Responsible for changing network stack interface attributes
63 * such as state, mtu or description.
64 */
65int
66_nl_modify_ifp_generic(struct ifnet *ifp, struct nl_parsed_link *lattrs,
67    const struct nlattr_bmask *bm, struct nl_pstate *npt)
68{
69	int error;
70
71	if (lattrs->ifla_ifalias != NULL) {
72		if (nlp_has_priv(npt->nlp, PRIV_NET_SETIFDESCR)) {
73			int len = strlen(lattrs->ifla_ifalias) + 1;
74			char *buf = if_allocdescr(len, M_WAITOK);
75
76			memcpy(buf, lattrs->ifla_ifalias, len);
77			if_setdescr(ifp, buf);
78			if_setlastchange(ifp);
79		} else {
80			nlmsg_report_err_msg(npt, "Not enough privileges to set descr");
81			return (EPERM);
82		}
83	}
84
85	if ((lattrs->ifi_change & IFF_UP) && (lattrs->ifi_flags & IFF_UP) == 0) {
86		/* Request to down the interface */
87		if_down(ifp);
88	}
89
90	if (lattrs->ifla_mtu > 0) {
91		if (nlp_has_priv(npt->nlp, PRIV_NET_SETIFMTU)) {
92			struct ifreq ifr = { .ifr_mtu = lattrs->ifla_mtu };
93			error = ifhwioctl(SIOCSIFMTU, ifp, (char *)&ifr, curthread);
94		} else {
95			nlmsg_report_err_msg(npt, "Not enough privileges to set mtu");
96			return (EPERM);
97		}
98	}
99
100	if (lattrs->ifi_change & IFF_PROMISC) {
101		error = ifpromisc(ifp, lattrs->ifi_flags & IFF_PROMISC);
102		if (error != 0) {
103			nlmsg_report_err_msg(npt, "unable to set promisc");
104			return (error);
105		}
106	}
107
108	return (0);
109}
110
111/*
112 * Saves the resulting ifindex and ifname to report them
113 *  to userland along with the operation result.
114 * NLA format:
115 * NLMSGERR_ATTR_COOKIE(nested)
116 *  IFLA_NEW_IFINDEX(u32)
117 *  IFLA_IFNAME(string)
118 */
119void
120_nl_store_ifp_cookie(struct nl_pstate *npt, struct ifnet *ifp)
121{
122	int ifname_len = strlen(if_name(ifp));
123	uint32_t ifindex = (uint32_t)if_getindex(ifp);
124
125	int nla_len = sizeof(struct nlattr) * 3 +
126		sizeof(ifindex) + NL_ITEM_ALIGN(ifname_len + 1);
127	struct nlattr *nla_cookie = npt_alloc(npt, nla_len);
128
129	/* Nested TLV */
130	nla_cookie->nla_len = nla_len;
131	nla_cookie->nla_type = NLMSGERR_ATTR_COOKIE;
132
133	struct nlattr *nla = nla_cookie + 1;
134	nla->nla_len = sizeof(struct nlattr) + sizeof(ifindex);
135	nla->nla_type = IFLA_NEW_IFINDEX;
136	memcpy(NLA_DATA(nla), &ifindex, sizeof(ifindex));
137
138	nla = NLA_NEXT(nla);
139	nla->nla_len = sizeof(struct nlattr) + ifname_len + 1;
140	nla->nla_type = IFLA_IFNAME;
141	strlcpy(NLA_DATA(nla), if_name(ifp), ifname_len + 1);
142
143	nlmsg_report_cookie(npt, nla_cookie);
144}
145
146