mdw@git.distorted.org.uk Git - tripe/blob - svc/tripe-ifup.in

   1 #! /bin/sh
   2 ###
   3 ### TrIPE interface initialization script
   4 ###   suitable for Linux; other operating systems probably want something
   5 ###   similar
   6
   7 ###----- Licensing notica ---------------------------------------------------
   8 ###
   9 ### Redistribution, modification and use of this file is permitted without
  10 ### limitation.
  11 ###
  12 ### This file is distributed in the hope that it will be useful,
  13 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  15
  16 set -e
  17
  18 ## Import compile-time configuration.
  19 : ${bindir=@bindir@}
  20 : ${tripectl=$bindir/tripectl}
  21 PATH=/usr/bin:/usr/sbin:/bin:/sbin:$bindir
  22 export PATH TRIPEDIR
  23
  24 ## Determine whether we have IPv6 support.
  25 if [ -d /proc/sys/net/ipv6 ]; then have6=t; else have6=nil; fi
  26
  27 ###--------------------------------------------------------------------------
  28 ### Error handling.
  29
  30 win=t
  31 try () {
  32   if "$@"; then :; else
  33     rc=$?
  34     tripectl warn tripe-ifup command-failed rc=$rc "$*"
  35     win=nil
  36   fi
  37 }
  38
  39 ###--------------------------------------------------------------------------
  40 ### Collect arguments.
  41
  42 ## Collect the simple arguments.
  43 if [ $# -lt 3 ]; then
  44   echo >&2 "usage: $0 PEER IFNAME ADDR..."; exit 1
  45 fi
  46 peer=$1 ifname=$2 family=$3; shift 3
  47
  48 ## Parse the address family.
  49 case "$family" in
  50   INET) ipsz=20 ;;
  51   INET6) ipsz=40 ;;
  52   *) echo >&2 "$0: unknown address family $family"; exit 1 ;;
  53 esac
  54 case "$family,$#" in
  55   INET,1 | INET6,1) addr=$1 port=4070 ;;
  56   INET,2 | INET6,2) addr=$1 port=$2 ;;
  57   INET,* | INET6,*) echo >&2 "$0: bad $family address"; exit 1 ;;
  58   *) echo >&2 "$0: unknown address family $family"; exit 1 ;;
  59 esac
  60
  61 ###--------------------------------------------------------------------------
  62 ### Set the interface name.
  63
  64 case "${P_IFNAME+set}" in
  65   set)
  66     try ip link set "$ifname" name "$P_IFNAME"
  67     ifname=$P_IFNAME
  68     $tripectl setifname "$peer" "$ifname"
  69     ;;
  70 esac
  71
  72 ###--------------------------------------------------------------------------
  73 ### Configure the link.
  74
  75 ## Split local addresses into v4 and v6 lists.
  76 unset l4addr l6addr
  77 for a in $P_LADDR; do
  78   case "$a" in
  79     *:*) l6addr=${l6addr+$l6addr }$a ;;
  80     *)   l4addr=${l4addr+$l4addr }$a ;;
  81   esac
  82 done
  83
  84 ## Determine the remote v4 and v6 addresses.  We only allow one remote
  85 ## address for each: others can be added as routes.
  86 unset r4addr r6addr
  87 for a in $P_RADDR; do
  88   case "$a" in
  89     *:*) r6addr=$a ;;
  90     *)   r4addr=$a ;;
  91   esac
  92 done
  93
  94 ## Configure the first v4 address as point-to-point; add the others as plain
  95 ## addresses.
  96 haveaddr4=nil
  97 set -- $l4addr
  98 case $#,${r4addr+set} in
  99   [1-9]*,set)
 100     try ip addr add "$1" peer "$r4addr" dev "$ifname"
 101     haveaddr4=t
 102     shift
 103     ;;
 104 esac
 105 for a in "$@"; do
 106   try ip addr add "$a" dev "$ifname"
 107   haveaddr4=t
 108 done
 109
 110 ## IPv6 point-to-point links seem broken in Linux.  Attach the local and
 111 ## remote addresses by hand.
 112 haveaddr6=nil
 113 set -- $l6addr
 114 case $have6,$# in
 115   t,[1-9]*)
 116
 117     ## If we're configured to set IPv6 addresses then we should ensure that
 118     ## they're going to work, even if the default setting for new interfaces
 119     ## is to disable IPv6.
 120     try sysctl -q net.ipv6.conf."$ifname".disable_ipv6=0
 121
 122     ## Now add the source and destination addresses.
 123     for a in "$@"; do
 124       try ip addr add "$a" dev "$ifname"
 125       haveaddr6=t
 126     done
 127     ;;
 128 esac
 129
 130 ###--------------------------------------------------------------------------
 131 ### Bring the interface up.
 132
 133 case $haveaddr4,$haveaddr6 in
 134   nil,nil)
 135     ;;
 136   *)
 137     case "${P_MTU+set}" in
 138       set)
 139         mtu=$P_MTU;;
 140       *)
 141         pathmtu=$(pathmtu "$addr")
 142         mtu=$(( $pathmtu - $ipsz - 9 - $A_BULK_OVERHEAD ))
 143         ;;
 144     esac
 145     try ip link set dev "$ifname" up mtu "$mtu"
 146     ;;
 147 esac
 148
 149 ###--------------------------------------------------------------------------
 150 ### Set the peer IPv6 address if any.
 151
 152 ## IPv6 point-to-point links seem broken in Linux.  Attach the local and
 153 ## remote addresses by hand.
 154 set -- $l6addr
 155 case $have6,$#,${r6addr+set} in
 156   t,[1-9]*,set)
 157     try ip route add $r6addr proto static dev "$ifname"
 158     ;;
 159 esac
 160
 161 ###--------------------------------------------------------------------------
 162 ### Set up routing.
 163
 164 ## Split the routes into v4 and v6 lists.
 165 unset route4 route6
 166 for p in $P_NETS; do
 167   case "$p" in
 168     *:*) route6=${route6+$route6 }$p ;;
 169     *)   route4=${route4+$route4 }$p ;;
 170   esac
 171 done
 172
 173 ## Add the v4 routes.
 174 set -- $route4
 175 case $haveaddr4,$# in
 176   t,[1-9]*)
 177     for p in "$@"; do
 178       try ip route add $p proto static via "$r4addr"
 179     done
 180     ;;
 181 esac
 182
 183 ## Add the v6 routes.
 184 set -- $route6
 185 case $haveaddr6,$# in
 186   t,[1-9]*)
 187     for p in "$@"; do
 188       try ip route add $p proto static via "${r6addr%/*}"
 189     done
 190     ;;
 191 esac
 192
 193 ###--------------------------------------------------------------------------
 194 ### Maybe invoke a follow-on script.
 195
 196 case "${P_IFUPEXTRA+set}" in
 197   set)
 198     eval "$P_IFUPEXTRA"
 199     ;;
 200 esac
 201
 202 ###--------------------------------------------------------------------------
 203 ### Issue a notification that we've won.
 204
 205 case $win in
 206   t) $tripectl notify tripe-ifup configured "$peer" ;;
 207   nil) $tripectl notify tripe-ifup configured "$peer" failed ;;
 208 esac
 209
 210 ###----- That's all, folks --------------------------------------------------