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 "opt_netlink.h" 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 #include "opt_inet.h" 32 #include "opt_inet6.h" 33 #include <sys/types.h> 34 #include <sys/malloc.h> 35 #include <sys/socket.h> 36 #include <sys/sockio.h> 37 #include <sys/syslog.h> 38 #include <sys/socketvar.h> 39 40 #include <net/ethernet.h> 41 #include <net/if.h> 42 #include <net/if_dl.h> 43 #include <net/if_media.h> 44 #include <net/if_var.h> 45 #include <net/if_clone.h> 46 #include <net/if_vlan_var.h> 47 #include <net/route.h> 48 #include <net/route/nhop.h> 49 #include <net/route/route_ctl.h> 50 #include <netlink/netlink.h> 51 #include <netlink/netlink_ctl.h> 52 #include <netlink/netlink_route.h> 53 #include <netlink/route/route_var.h> 54 55 #include <netinet6/scope6_var.h> /* scope deembedding */ 56 57 #define DEBUG_MOD_NAME nl_iface_drivers 58 #define DEBUG_MAX_LEVEL LOG_DEBUG3 59 #include <netlink/netlink_debug.h> 60 _DECLARE_DEBUG(LOG_INFO); 61 62 /* 63 * Generic modification interface handler. 64 * Responsible for changing network stack interface attributes 65 * such as state, mtu or description. 66 */ 67 int 68 _nl_modify_ifp_generic(struct ifnet *ifp, struct nl_parsed_link *lattrs, 69 const struct nlattr_bmask *bm, struct nl_pstate *npt) 70 { 71 int error; 72 73 if (lattrs->ifla_ifalias != NULL) { 74 if (nlp_has_priv(npt->nlp, PRIV_NET_SETIFDESCR)) { 75 int len = strlen(lattrs->ifla_ifalias) + 1; 76 char *buf = if_allocdescr(len, M_WAITOK); 77 78 memcpy(buf, lattrs->ifla_ifalias, len); 79 if_setdescr(ifp, buf); 80 getmicrotime(&ifp->if_lastchange); 81 } else { 82 nlmsg_report_err_msg(npt, "Not enough privileges to set descr"); 83 return (EPERM); 84 } 85 } 86 87 if ((lattrs->ifi_change & IFF_UP) && (lattrs->ifi_flags & IFF_UP) == 0) { 88 /* Request to down the interface */ 89 if_down(ifp); 90 } 91 92 if (lattrs->ifla_mtu > 0) { 93 if (nlp_has_priv(npt->nlp, PRIV_NET_SETIFMTU)) { 94 struct ifreq ifr = { .ifr_mtu = lattrs->ifla_mtu }; 95 error = ifhwioctl(SIOCSIFMTU, ifp, (char *)&ifr, curthread); 96 } else { 97 nlmsg_report_err_msg(npt, "Not enough privileges to set mtu"); 98 return (EPERM); 99 } 100 } 101 102 if (lattrs->ifi_change & IFF_PROMISC) { 103 error = ifpromisc(ifp, lattrs->ifi_flags & IFF_PROMISC); 104 if (error != 0) { 105 nlmsg_report_err_msg(npt, "unable to set promisc"); 106 return (error); 107 } 108 } 109 110 return (0); 111 } 112 113 /* 114 * Saves the resulting ifindex and ifname to report them 115 * to userland along with the operation result. 116 * NLA format: 117 * NLMSGERR_ATTR_COOKIE(nested) 118 * IFLA_NEW_IFINDEX(u32) 119 * IFLA_IFNAME(string) 120 */ 121 void 122 _nl_store_ifp_cookie(struct nl_pstate *npt, struct ifnet *ifp) 123 { 124 int ifname_len = strlen(if_name(ifp)); 125 uint32_t ifindex = (uint32_t)ifp->if_index; 126 127 int nla_len = sizeof(struct nlattr) * 3 + 128 sizeof(ifindex) + NL_ITEM_ALIGN(ifname_len + 1); 129 struct nlattr *nla_cookie = npt_alloc(npt, nla_len); 130 131 /* Nested TLV */ 132 nla_cookie->nla_len = nla_len; 133 nla_cookie->nla_type = NLMSGERR_ATTR_COOKIE; 134 135 struct nlattr *nla = nla_cookie + 1; 136 nla->nla_len = sizeof(struct nlattr) + sizeof(ifindex); 137 nla->nla_type = IFLA_NEW_IFINDEX; 138 memcpy(NLA_DATA(nla), &ifindex, sizeof(ifindex)); 139 140 nla = NLA_NEXT(nla); 141 nla->nla_len = sizeof(struct nlattr) + ifname_len + 1; 142 nla->nla_type = IFLA_IFNAME; 143 strlcpy(NLA_DATA(nla), if_name(ifp), ifname_len + 1); 144 145 nlmsg_report_cookie(npt, nla_cookie); 146 } 147 148