| 1 | # 6in4.sh - IPv6-in-IPv4 tunnel backend |
| 2 | # Copyright (c) 2010 OpenWrt.org |
| 3 | |
| 4 | find_6in4_wanif() { |
| 5 | local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}" |
| 6 | [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if" |
| 7 | } |
| 8 | |
| 9 | find_6in4_wanip() { |
| 10 | local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }" |
| 11 | echo "${ip%%[^0-9.]*}" |
| 12 | } |
| 13 | |
| 14 | # Hook into scan_interfaces() to synthesize a .device option |
| 15 | # This is needed for /sbin/ifup to properly dispatch control |
| 16 | # to setup_interface_6in4() even if no .ifname is set in |
| 17 | # the configuration. |
| 18 | scan_6in4() { |
| 19 | config_set "$1" device "6in4-$1" |
| 20 | } |
| 21 | |
| 22 | coldplug_interface_6in4() { |
| 23 | setup_interface_6in4 "6in4-$1" "$1" |
| 24 | } |
| 25 | |
| 26 | setup_interface_6in4() { |
| 27 | local iface="$1" |
| 28 | local cfg="$2" |
| 29 | local link="6in4-$cfg" |
| 30 | |
| 31 | local local4=$(uci_get network "$cfg" ipaddr) |
| 32 | |
| 33 | local remote4 |
| 34 | config_get remote4 "$cfg" peeraddr |
| 35 | |
| 36 | local local6 |
| 37 | config_get local6 "$cfg" ip6addr |
| 38 | |
| 39 | local mtu |
| 40 | config_get mtu "$cfg" mtu |
| 41 | |
| 42 | local ttl |
| 43 | config_get ttl "$cfg" ttl |
| 44 | |
| 45 | local metric |
| 46 | config_get metric "$cfg" metric |
| 47 | |
| 48 | local defaultroute |
| 49 | config_get_bool defaultroute "$cfg" defaultroute 1 |
| 50 | |
| 51 | # If local4 is unset, guess local IPv4 address from the |
| 52 | # interface used by the default route. |
| 53 | [ -z "$local4" ] && { |
| 54 | local wanif=$(find_6in4_wanif) |
| 55 | [ -n "$wanif" ] && { |
| 56 | local4=$(find_6in4_wanip "$wanif") |
| 57 | uci_set_state network "$cfg" wan_device "$wanif" |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | [ -n "$local4" ] && { |
| 62 | # creating the tunnel below will trigger a net subsystem event |
| 63 | # prevent it from touching or iface by disabling .auto here |
| 64 | uci_set_state network "$cfg" ifname $link |
| 65 | uci_set_state network "$cfg" auto 0 |
| 66 | |
| 67 | ip tunnel add $link mode sit remote $remote4 local $local4 ttl ${ttl:-64} |
| 68 | ip link set $link up |
| 69 | ip link set mtu ${mtu:-1280} dev $link |
| 70 | ip addr add $local6 dev $link |
| 71 | |
| 72 | uci_set_state network "$cfg" ipaddr $local4 |
| 73 | uci_set_state network "$cfg" ip6addr $local6 |
| 74 | |
| 75 | [ "$defaultroute" = 1 ] && { |
| 76 | ip -6 route add ::/0 ${metric:+metric $metric} dev $link |
| 77 | uci_set_state network "$cfg" defaultroute 1 |
| 78 | } |
| 79 | |
| 80 | env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" & |
| 81 | } || { |
| 82 | echo "Cannot determine local IPv4 address for 6in4 tunnel $cfg - skipping" |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | stop_interface_6in4() { |
| 87 | local cfg="$1" |
| 88 | local link="6in4-$cfg" |
| 89 | |
| 90 | local local6=$(uci_get_state network "$cfg" ip6addr) |
| 91 | local defaultroute=$(uci_get_state network "$cfg" defaultroute) |
| 92 | |
| 93 | grep -qs "^ *$link:" /proc/net/dev && { |
| 94 | env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" & |
| 95 | |
| 96 | [ "$defaultroute" = "1" ] && { |
| 97 | ip -6 route del ::/0 dev $link |
| 98 | } |
| 99 | |
| 100 | ip addr del $local6 dev $link |
| 101 | ip link set $link down |
| 102 | ip tunnel del $link |
| 103 | } |
| 104 | } |
| 105 | |
