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 */
65 int
_nl_modify_ifp_generic(struct ifnet * ifp,struct nl_parsed_link * lattrs,const struct nlattr_bmask * bm,struct nl_pstate * npt)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) != 0 || lattrs->ifi_change == 0) {
86 /* Request to up or down the interface */
87 if (lattrs->ifi_flags & IFF_UP)
88 if_up(ifp);
89 else
90 if_down(ifp);
91 }
92
93 if (lattrs->ifla_mtu > 0) {
94 if (nlp_has_priv(npt->nlp, PRIV_NET_SETIFMTU)) {
95 struct ifreq ifr = { .ifr_mtu = lattrs->ifla_mtu };
96 error = ifhwioctl(SIOCSIFMTU, ifp, (char *)&ifr,
97 curthread);
98 if (error != 0) {
99 nlmsg_report_err_msg(npt, "Failed to set mtu");
100 return (error);
101 }
102 } else {
103 nlmsg_report_err_msg(npt, "Not enough privileges to set mtu");
104 return (EPERM);
105 }
106 }
107
108 if ((lattrs->ifi_change & IFF_PROMISC) != 0 ||
109 lattrs->ifi_change == 0)
110 /*
111 * When asking for IFF_PROMISC, set permanent flag instead
112 * (IFF_PPROMISC) as we have no way of doing promiscuity
113 * reference counting through ifpromisc(). Every call to this
114 * function either sets or unsets IFF_PROMISC, and ifi_change
115 * is usually set to 0xFFFFFFFF.
116 */
117 if_setppromisc(ifp, (lattrs->ifi_flags & IFF_PROMISC) != 0);
118
119 if (lattrs->ifla_address != NULL) {
120 if (nlp_has_priv(npt->nlp, PRIV_NET_SETIFMAC)) {
121 error = if_setlladdr(ifp,
122 NLA_DATA(lattrs->ifla_address),
123 NLA_DATA_LEN(lattrs->ifla_address));
124 if (error != 0) {
125 nlmsg_report_err_msg(npt,
126 "setting IFLA_ADDRESS failed with error code: %d",
127 error);
128 return (error);
129 }
130 } else {
131 nlmsg_report_err_msg(npt,
132 "Not enough privileges to set IFLA_ADDRESS");
133 return (EPERM);
134 }
135 }
136
137 return (0);
138 }
139
140 /*
141 * Saves the resulting ifindex and ifname to report them
142 * to userland along with the operation result.
143 * NLA format:
144 * NLMSGERR_ATTR_COOKIE(nested)
145 * IFLA_NEW_IFINDEX(u32)
146 * IFLA_IFNAME(string)
147 */
148 void
_nl_store_ifp_cookie(struct nl_pstate * npt,struct ifnet * ifp)149 _nl_store_ifp_cookie(struct nl_pstate *npt, struct ifnet *ifp)
150 {
151 int ifname_len = strlen(if_name(ifp));
152 uint32_t ifindex = (uint32_t)if_getindex(ifp);
153
154 int nla_len = sizeof(struct nlattr) * 3 +
155 sizeof(ifindex) + NL_ITEM_ALIGN(ifname_len + 1);
156 struct nlattr *nla_cookie = npt_alloc(npt, nla_len);
157
158 /* Nested TLV */
159 nla_cookie->nla_len = nla_len;
160 nla_cookie->nla_type = NLMSGERR_ATTR_COOKIE;
161
162 struct nlattr *nla = nla_cookie + 1;
163 nla->nla_len = sizeof(struct nlattr) + sizeof(ifindex);
164 nla->nla_type = IFLA_NEW_IFINDEX;
165 memcpy(NLA_DATA(nla), &ifindex, sizeof(ifindex));
166
167 nla = NLA_NEXT(nla);
168 nla->nla_len = sizeof(struct nlattr) + ifname_len + 1;
169 nla->nla_type = IFLA_IFNAME;
170 strlcpy(NLA_DATA(nla), if_name(ifp), ifname_len + 1);
171
172 nlmsg_report_cookie(npt, nla_cookie);
173 }
174
175