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#!/bin/bash
set -e
$NFT -f /dev/stdin <<"EOF"
table ip t {
set s {
type ipv4_addr . iface_index
flags interval
elements = { 127.0.0.1 . 1 }
}
set s2 {
typeof ip saddr . meta iif
elements = { 127.0.0.1 . 1 }
}
set s3 {
type iface_index
elements = { "lo" }
}
set s4 {
type iface_index
flags interval
elements = { "lo" }
}
set nomatch {
typeof ip saddr . meta iif
elements = { 127.0.0.3 . 1 }
}
set nomatch2 {
type ipv4_addr . iface_index
elements = { 127.0.0.2 . 90000 }
}
chain c {
type filter hook input priority filter;
icmp type echo-request ip saddr . meta iif @s counter
icmp type echo-request ip saddr . 1 @s counter
icmp type echo-request ip saddr . "lo" @s counter
icmp type echo-request ip saddr . meta iif @s2 counter
icmp type echo-request ip saddr . 1 @s2 counter
icmp type echo-request ip saddr . "lo" @s2 counter
icmp type echo-request ip daddr . "lo" @s counter
icmp type echo-request ip daddr . "lo" @s2 counter
icmp type echo-request meta iif @s3 counter
icmp type echo-request meta iif @s4 counter
ip daddr . 1 @nomatch counter drop
ip daddr . meta iif @nomatch2 counter drop
}
}
EOF
$NFT add element t s { 127.0.0.2 . 1 }
$NFT add element t s2 { 127.0.0.2 . "lo" }
ip link set lo up
ping -q -c 1 127.0.0.2 > /dev/null
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