#!/bin/sh - # # $OpenBSD: netstart,v 1.219 2022/07/03 12:14:36 kn Exp $ # Turn off Strict Bourne shell mode. set +o sh # Show usage of the netstart script and exit. usage() { print -u2 "usage: ${0##*/} [[-n] interface ...]" exit 1 } # Test the first argument against the remaining ones, return success on a match. isin() { local _a=$1 _b shift for _b; do [[ $_a == "$_b" ]] && return 0 done return 1 } # Echo file $1 to stdout. Skip comment lines. Strip leading and trailing # whitespace if IFS is set. # Usage: stripcom /path/to/file stripcom() { local _file=$1 _line [[ -f $_file ]] || return while read _line; do [[ -n ${_line%%#*} ]] && print -r -- "$_line" done <$_file } # Parse and "unpack" a hostname.if(5) line given as positional parameters. # Fill the _cmds array with the resulting interface configuration commands. parse_hn_line() { local _af=0 _name=1 _mask=2 _bc=3 _prefix=2 _c _cmd _prev _daddr _dhcp _i set -A _c -- "$@" set -o noglob case ${_c[_af]} in ''|*([[:blank:]])'#'*) return ;; inet) ((${#_c[*]} > 1)) || return if [[ ${_c[_name]} == autoconf ]]; then _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}" V4_AUTOCONF=true return fi [[ ${_c[_name]} == alias ]] && _mask=3 _bc=4 [[ -n ${_c[_mask]} ]] && _c[_mask]="netmask ${_c[_mask]}" if [[ -n ${_c[_bc]} ]]; then _c[_bc]="broadcast ${_c[_bc]}" [[ ${_c[_bc]} == *NONE ]] && _c[_bc]= fi _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}" ;; inet6) ((${#_c[*]} > 1)) || return if [[ ${_c[_name]} == autoconf ]]; then _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}" V6_AUTOCONF=true return fi [[ ${_c[_name]} == alias ]] && _prefix=3 [[ -n ${_c[_prefix]} ]] && _c[_prefix]="prefixlen ${_c[_prefix]}" _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}" ;; dest) ((${#_c[*]} == 2)) && _daddr=${_c[1]} || return _prev=$((${#_cmds[*]} - 1)) ((_prev >= 0)) || return set -A _c -- ${_cmds[_prev]} _name=3 [[ ${_c[_name]} == alias ]] && _name=4 _c[_name]="${_c[_name]} $_daddr" _cmds[$_prev]="${_c[@]}" ;; dhcp) _cmds[${#_cmds[*]}]="ifconfig $_if inet autoconf" V4_AUTOCONF=true ;; '!'*) _cmd=$(print -- "${_c[@]}" | sed 's/\$if/'$_if'/g') _cmds[${#_cmds[*]}]="${_cmd#!}" ;; *) _cmds[${#_cmds[*]}]="ifconfig $_if ${_c[@]}" ;; esac unset _c set +o noglob } # Create interface $1 if it does not yet exist. # Usage: ifcreate if1 ifcreate() { local _if=$1 if $PRINT_ONLY; then print -r -- "{ ifconfig $_if || ifconfig $_if create; }" else { ifconfig $_if || ifconfig $_if create; } >/dev/null 2>&1 fi } # Create interfaces for network pseudo-devices referred to by hostname.if files. # Optionally, limit creation to given interfaces only. # Usage: vifscreate [if ...] vifscreate() { local _vif _hn _if for _vif in $(ifconfig -C); do for _hn in /etc/hostname.${_vif}+([[:digit:]]); do [[ -f $_hn ]] || continue _if=${_hn#/etc/hostname.} # loopback for routing domain is created by kernel [[ -n ${_if##lo[1-9]*} ]] || continue if (($# > 0)) && ! isin $_if "$@"; then continue fi if ! ifcreate $_if; then print -u2 "${0##*/}: create for '$_if' failed." fi done done } # Start a single interface. # Usage: ifstart if1 ifstart() { local _if=$1 _hn=/etc/hostname.$1 _cmds _i=0 _line _stat set -A _cmds # Interface names must be alphanumeric only. We check to avoid # configuring backup or temp files, and to catch the "*" case. [[ $_if != +([[:alpha:]])+([[:digit:]]) ]] && return if [[ ! -f $_hn ]]; then print -u2 "${0##*/}: $_hn: No such file or directory." return fi # Not using stat(1), we can't rely on having /usr yet. set -A _stat -- $(ls -nL $_hn) if [[ "${_stat[0]}${_stat[2]}${_stat[3]}" != *---00 ]]; then print -u2 "WARNING: $_hn is insecure, fixing permissions." chmod -LR o-rwx $_hn chown -LR root:wheel $_hn fi # Check for ifconfig'able interface, except if -n option is specified. ifcreate $_if || return # Parse the hostname.if(5) file and fill _cmds array with interface # configuration commands. set -o noglob while IFS= read -- _line; do parse_hn_line $_line done <$_hn # Apply the interface configuration commands stored in _cmds array. while ((_i < ${#_cmds[*]})); do if $PRINT_ONLY; then print -r -- "${_cmds[_i]}" else eval "${_cmds[_i]}" fi ((_i++)) done unset _cmds set +o noglob } # Start multiple interfaces by driver name. # Usage: ifmstart "em iwm" "trunk vlan" # Start "$1" interfaces in order or all interfaces if empty. # Don't start "$2" interfaces. "$2" is optional. ifmstart() { local _sifs=$1 _xifs=$2 _hn _if _sif _xif for _sif in ${_sifs:-ALL}; do for _hn in /etc/hostname.+([[:alpha:]])+([[:digit:]]); do [[ -f $_hn ]] || continue _if=${_hn#/etc/hostname.} # Skip unwanted ifs. for _xif in $_xifs; do [[ $_xif == ${_if%%[0-9]*} ]] && continue 2 done # Start wanted ifs. [[ $_sif == @(ALL|${_if%%[0-9]*}) ]] && ifstart $_if done done } # Parse /etc/mygate and add default routes for IPv4 and IPv6. # Usage: defaultroute defaultroute() { local _cmd _v4set=false _v6set=false; set -o noglob stripcom /etc/mygate | while read gw; do case $gw in '!'*) _cmd=$(print -- "$gw") _cmd="${_cmd#!}" ;; !(*:*)) ($_v4set || $V4_AUTOCONF) && continue _cmd="route -qn add -host default $gw" _v4set=true ;; *) ($_v6set || $V6_AUTOCONF) && continue _cmd="route -qn add -host -inet6 default $gw" _v6set=true ;; esac if $PRINT_ONLY; then print -r -- "$_cmd" else $_cmd fi done set +o noglob } # add all the routes needed for IPv6 ip6routes() { local _i=0 set -A _cmds # Disallow link-local unicast dest without outgoing scope identifiers. _cmds[_i++]="route -qn add -inet6 fe80:: -prefixlen 10 ::1 -reject" # Disallow site-local unicast dest without outgoing scope identifiers. # If you configure site-locals without scope id (it is permissible # config for routers that are not on scope boundary), you may want # to comment the line out. _cmds[_i++]="route -qn add -inet6 fec0:: -prefixlen 10 ::1 -reject" # Disallow "internal" addresses to appear on the wire. _cmds[_i++]="route -qn add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject" # Disallow packets to malicious 6to4 prefix. _cmds[_i++]="route -qn add -inet6 2002:e000:: -prefixlen 20 ::1 -reject" _cmds[_i++]="route -qn add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject" _cmds[_i++]="route -qn add -inet6 2002:0000:: -prefixlen 24 ::1 -reject" _cmds[_i++]="route -qn add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject" # Disallow packets without scope identifier. _cmds[_i++]="route -qn add -inet6 ff01:: -prefixlen 16 ::1 -reject" _cmds[_i++]="route -qn add -inet6 ff02:: -prefixlen 16 ::1 -reject" # Completely disallow packets to IPv4 compatible prefix. # # This may conflict with RFC1933 under following circumstances: # (1) An IPv6-only KAME node tries to originate packets to IPv4 # compatible destination. The KAME node has no IPv4 compatible # support. Under RFC1933, it should transmit native IPv6 # packets toward IPv4 compatible destination, hoping it would # reach a router that forwards the packet toward auto-tunnel # interface. # (2) An IPv6-only node originates a packet to an IPv4 compatible # destination. A KAME node is acting as an IPv6 router, and # asked to forward it. # # Due to rare use of IPv4 compatible addresses, and security issues # with it, we disable it by default. _cmds[_i++]="route -qn add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject" # Apply the interface configuration commands stored in _cmds array. _i=0 while ((_i < ${#_cmds[*]})); do if $PRINT_ONLY; then print -r -- "${_cmds[_i]}" else eval "${_cmds[_i]}" fi ((_i++)) done unset _cmds } # wait for autoconf interfaces wait_autoconf_default() { if ifconfig | grep -q ': flags=.*<.*AUTOCONF.*>'; then count=0 while ((count++ < 20)); do route -n show | grep -q ^default && break sleep .5 done fi } # Make sure the invoking user has the right privileges. Check for presence of # id(1) to avoid problems with diskless setups. if [[ -x /usr/bin/id ]] && (($(id -u) != 0)); then echo "${0##*/}: need root privileges" exit 1 fi # Get network related vars from rc.conf using the parsing routine from rc.subr. FUNCS_ONLY=1 . /etc/rc.d/rc.subr _rc_parse_conf PRINT_ONLY=false V4_AUTOCONF=false V6_AUTOCONF=false while getopts ":n" opt; do case $opt in n) PRINT_ONLY=true;; *) usage;; esac done shift $((OPTIND-1)) # Load key material for the generation of IPv6 Semantically Opaque Interface # Identifiers (SOII) used for link local and SLAAC addresses. $PRINT_ONLY || [[ ! -f /etc/soii.key ]] || sysctl -q "net.inet6.ip6.soiikey=$(</etc/soii.key)" # If we were invoked with a list of interface names, just reconfigure these # interfaces (or bridges), add default routes and return. # Create virtual interfaces upfront to make ifconfig commands depending on # other interfaces, e.g. "patch", work regardless of in which order interface # names were specified. if (($# > 0)); then vifscreate "$@" for _if; do ifstart $_if; done defaultroute return fi # Otherwise, process with the complete network initialization. # Set the address for the loopback interface. Bringing the interface up, # automatically invokes the IPv6 address ::1. if $PRINT_ONLY; then print -r -- "ifconfig lo0 inet 127.0.0.1/8" else ifconfig lo0 inet 127.0.0.1/8 fi # IPv6 configuration. if ifconfig lo0 inet6 >/dev/null 2>&1; then ip6kernel=YES ip6routes else ip6kernel=NO fi # Create all the pseudo interfaces up front. vifscreate # Configure all the non-loopback interfaces which we know about, but # do not start interfaces which must be delayed. Refer to hostname.if(5) ifmstart "" "aggr trunk svlan vlan carp pppoe tun tap gif etherip gre egre nvgre eoip vxlan pflow wg" # The aggr and trunk interfaces need to come up first in this list. # The (s)vlan interfaces need to come up after trunk. # Configure all the carp interfaces which we know about before default route. ifmstart "aggr trunk svlan vlan carp pppoe" # Set default routes for IPv4 and IPv6. defaultroute # Multicast routing. if [[ $multicast != YES ]]; then if $PRINT_ONLY; then print -r -- "route -qn delete 224.0.0.0/4" print -r -- "route -qn add -net 224.0.0.0/4 -interface 127.0.0.1 -reject" else route -qn delete 224.0.0.0/4 route -qn add -net 224.0.0.0/4 -interface 127.0.0.1 -reject fi fi # Reject 127/8 other than 127.0.0.1. if $PRINT_ONLY; then print -r -- "route -qn add -net 127 127.0.0.1 -reject" else route -qn add -net 127 127.0.0.1 -reject fi # If interface autoconf exists, pause a little for at least one default route wait_autoconf_default # Configure interfaces that rely on routing ifmstart "tun tap gif etherip gre egre nvgre eoip vxlan pflow wg" if [[ $ip6kernel == YES ]]; then # Ensure IPv6 Duplicate Address Detection (DAD) is completed. count=0 while ((count++ < 10 && $(sysctl -n net.inet6.ip6.dad_pending) != 0)); do sleep 1 done fi