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 ### Collect arguments.
  29
  30 ## Collect the simple arguments.
  31 if [ $# -lt 3 ]; then
  32   echo >&2 "usage: $0 PEER IFNAME ADDR..."; exit 1
  33 fi
  34 peer=$1 ifname=$2 family=$3; shift 3
  35
  36 ## Parse the address family.
  37 case "$family,$#" in
  38   INET,1) addr=$1 port=4070 ;;
  39   INET,2) addr=$1 port=$2 ;;
  40   INET,*) echo >&2 "$0: bad INET address"; exit 1 ;;
  41   *)      echo >&2 "$0: unknown address family $family"; exit 1 ;;
  42 esac
  43
  44 ###--------------------------------------------------------------------------
  45 ### Set the interface name.
  46
  47 case "${P_IFNAME+set}" in
  48   set)
  49     ip link set "$ifname" name "$P_IFNAME"
  50     ifname=$P_IFNAME
  51     $tripectl setifname "$peer" "$ifname"
  52     ;;
  53 esac
  54
  55 ###--------------------------------------------------------------------------
  56 ### Configure the point-to-point link.
  57
  58 ## Split local addresses into v4 and v6 lists.
  59 unset l4addr l6addr
  60 for a in $P_LADDR; do
  61   case "$a" in
  62     *:*) l6addr=${l6addr+$l6addr }$a ;;
  63     *)   l4addr=${l4addr+$l4addr }$a ;;
  64   esac
  65 done
  66
  67 ## Determine the remote v4 and v6 addresses.  We only allow one remote
  68 ## address for each: others can be added as routes.
  69 unset r4addr r6addr
  70 for a in $P_RADDR; do
  71   case "$a" in
  72     *:*) r6addr=$a ;;
  73     *)   r4addr=$a ;;
  74   esac
  75 done
  76
  77 ## Configure the first v4 address as point-to-point; add the others as plain
  78 ## addresses.
  79 haveaddr4=nil
  80 set -- $l4addr
  81 case $#,${r4addr+set} in
  82   [1-9]*,set)
  83     ip addr add "$1" peer "$r4addr" dev "$ifname"
  84     haveaddr4=t
  85     shift
  86     ;;
  87 esac
  88 for a in "$@"; do
  89   ip addr add "$a/32" dev "$ifname"
  90   haveaddr4=t
  91 done
  92
  93 ## IPv6 point-to-point links seem broken in Linux.  Attach the local and
  94 ## remote addresses by hand.
  95 haveaddr6=nil
  96 set -- $l6addr
  97 case $have6,$# in
  98   t,[1-9]*)
  99     for a in "$@"; do
 100       ip addr add "$a/128" dev "$ifname"
 101       haveaddr6=t
 102     done
 103     case ${r6addr+set} in
 104       set) ip route add $r6addr/128 dev "$ifname" ;;
 105     esac
 106     ;;
 107 esac
 108
 109 ###--------------------------------------------------------------------------
 110 ### Set up routing.
 111
 112 ## Split the routes into v4 and v6 lists.
 113 unset route4 route6
 114 for p in $P_NETS; do
 115   case "$p" in
 116     *:*) route6=${route6+$route6 }$p ;;
 117     *)   route4=${route4+$route4 }$p ;;
 118   esac
 119 done
 120
 121 ## Add the v4 routes.
 122 set -- $route4
 123 case $haveaddr4,$# in
 124   t,[1-9]*)
 125     for p in "$@"; do
 126       ip route add $p via "$r4addr"
 127     done
 128     ;;
 129 esac
 130
 131 ## Add the v6 routes.
 132 set -- $route6
 133 case $haveaddr6,$# in
 134   t,[1-9]*)
 135     for p in "$@"; do
 136       ip route add $p via "$r6addr"
 137     done
 138     ;;
 139 esac
 140
 141 ###--------------------------------------------------------------------------
 142 ### Bring the interface up.
 143
 144 case $haveaddr4,$haveaddr6 in
 145   nil,nil)
 146     ;;
 147   *)
 148     case "${P_MTU+set}" in
 149       set)
 150         mtu=$P_MTU;;
 151       *)
 152         pathmtu=$(pathmtu "$addr")
 153         mtu=$(expr "$pathmtu" - 33 - $A_CIPHER_BLKSZ - $A_MAC_TAGSZ)
 154         ;;
 155     esac
 156     ip link set dev "$ifname" up mtu "$mtu"
 157     ;;
 158 esac
 159
 160 ###--------------------------------------------------------------------------
 161 ### Maybe invoke a follow-on script.
 162
 163 case "${P_IFUPEXTRA+set}" in
 164   set)
 165     eval "$P_IFUPEXTRA"
 166     ;;
 167 esac
 168
 169 ###--------------------------------------------------------------------------
 170 ### Issue a notification that we've won.
 171
 172 $tripectl notify tripe-ifup configured "$peer"
 173
 174 ###----- That's all, folks --------------------------------------------------