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 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 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