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,1) addr=$1 port=4070 ;;
  51   INET,2) addr=$1 port=$2 ;;
  52   INET,*) echo >&2 "$0: bad INET address"; exit 1 ;;
  53   *)      echo >&2 "$0: unknown address family $family"; exit 1 ;;
  54 esac
  55
  56 ###--------------------------------------------------------------------------
  57 ### Set the interface name.
  58
  59 case "${P_IFNAME+set}" in
  60   set)
  61     try ip link set "$ifname" name "$P_IFNAME"
  62     ifname=$P_IFNAME
  63     $tripectl setifname "$peer" "$ifname"
  64     ;;
  65 esac
  66
  67 ###--------------------------------------------------------------------------
  68 ### Configure the link.
  69
  70 ## Split local addresses into v4 and v6 lists.
  71 unset l4addr l6addr
  72 for a in $P_LADDR; do
  73   case "$a" in
  74     *:*) l6addr=${l6addr+$l6addr }$a ;;
  75     *)   l4addr=${l4addr+$l4addr }$a ;;
  76   esac
  77 done
  78
  79 ## Determine the remote v4 and v6 addresses.  We only allow one remote
  80 ## address for each: others can be added as routes.
  81 unset r4addr r6addr
  82 for a in $P_RADDR; do
  83   case "$a" in
  84     *:*) r6addr=$a ;;
  85     *)   r4addr=$a ;;
  86   esac
  87 done
  88
  89 ## Configure the first v4 address as point-to-point; add the others as plain
  90 ## addresses.
  91 haveaddr4=nil
  92 set -- $l4addr
  93 case $#,${r4addr+set} in
  94   [1-9]*,set)
  95     try ip addr add "$1" peer "$r4addr" dev "$ifname"
  96     haveaddr4=t
  97     shift
  98     ;;
  99 esac
 100 for a in "$@"; do
 101   try ip addr add "$a" dev "$ifname"
 102   haveaddr4=t
 103 done
 104
 105 ## IPv6 point-to-point links seem broken in Linux.  Attach the local and
 106 ## remote addresses by hand.
 107 haveaddr6=nil
 108 set -- $l6addr
 109 case $have6,$# in
 110   t,[1-9]*)
 111
 112     ## If we're configured to set IPv6 addresses then we should ensure that
 113     ## they're going to work, even if the default setting for new interfaces
 114     ## is to disable IPv6.
 115     try sysctl -q net.ipv6.conf."$ifname".disable_ipv6=0
 116
 117     ## Now add the source and destination addresses.
 118     for a in "$@"; do
 119       try ip addr add "$a" dev "$ifname"
 120       haveaddr6=t
 121     done
 122     case ${r6addr+set} in
 123       set) try ip route add $r6addr proto static dev "$ifname" ;;
 124     esac
 125     ;;
 126 esac
 127
 128 ###--------------------------------------------------------------------------
 129 ### Bring the interface up.
 130
 131 case $haveaddr4,$haveaddr6 in
 132   nil,nil)
 133     ;;
 134   *)
 135     case "${P_MTU+set}" in
 136       set)
 137         mtu=$P_MTU;;
 138       *)
 139         pathmtu=$(pathmtu "$addr")
 140         mtu=$(expr "$pathmtu" - 29 - $A_BULK_OVERHEAD)
 141         ;;
 142     esac
 143     try ip link set dev "$ifname" up mtu "$mtu"
 144     ;;
 145 esac
 146
 147 ###--------------------------------------------------------------------------
 148 ### Set up routing.
 149
 150 ## Split the routes into v4 and v6 lists.
 151 unset route4 route6
 152 for p in $P_NETS; do
 153   case "$p" in
 154     *:*) route6=${route6+$route6 }$p ;;
 155     *)   route4=${route4+$route4 }$p ;;
 156   esac
 157 done
 158
 159 ## Add the v4 routes.
 160 set -- $route4
 161 case $haveaddr4,$# in
 162   t,[1-9]*)
 163     for p in "$@"; do
 164       try ip route add $p proto static via "$r4addr"
 165     done
 166     ;;
 167 esac
 168
 169 ## Add the v6 routes.
 170 set -- $route6
 171 case $haveaddr6,$# in
 172   t,[1-9]*)
 173     for p in "$@"; do
 174       try ip route add $p proto static via "${r6addr%/*}"
 175     done
 176     ;;
 177 esac
 178
 179 ###--------------------------------------------------------------------------
 180 ### Maybe invoke a follow-on script.
 181
 182 case "${P_IFUPEXTRA+set}" in
 183   set)
 184     eval "$P_IFUPEXTRA"
 185     ;;
 186 esac
 187
 188 ###--------------------------------------------------------------------------
 189 ### Issue a notification that we've won.
 190
 191 case $win in
 192   t) $tripectl notify tripe-ifup configured "$peer" ;;
 193   nil) $tripectl notify tripe-ifup configured "$peer" failed ;;
 194 esac
 195
 196 ###----- That's all, folks --------------------------------------------------