nftables: use default drop in prerouting-raw table

nftables/nftables-attestation.conf

@@ -25,6 +25,7 @@ table inet filter {
 
     chain prerouting-raw {
         type filter hook prerouting priority raw
+        policy drop
 
         # drop packets without a reverse path (strict reverse path filtering)
         fib saddr . iif oif missing counter drop
@@ -39,6 +40,7 @@ table inet filter {
         # handle new TCP connections beyond rate limit via synproxy to avoid conntrack table exhaustion
         tcp dport { 22, 80, 443 } tcp flags syn limit rate over 1024/second burst 128 packets counter notrack accept
 
+        meta l4proto { tcp, udp } accept
         meta l4proto { icmp, ipv6-icmp } notrack accept
     }
 

nftables/nftables-discuss.conf

@@ -25,6 +25,7 @@ table inet filter {
 
     chain prerouting-raw {
         type filter hook prerouting priority raw
+        policy drop
 
         # drop packets without a reverse path (strict reverse path filtering)
         fib saddr . iif oif missing counter drop
@@ -39,6 +40,7 @@ table inet filter {
         # handle new TCP connections beyond rate limit via synproxy to avoid conntrack table exhaustion
         tcp dport { 22, 80, 443 } tcp flags syn limit rate over 1024/second burst 128 packets counter notrack accept
 
+        meta l4proto { tcp, udp } accept
         meta l4proto { icmp, ipv6-icmp } notrack accept
     }
 

nftables/nftables-mail.conf

@@ -37,6 +37,7 @@ table inet filter {
 
     chain prerouting-raw {
         type filter hook prerouting priority raw
+        policy drop
 
         # drop packets without a reverse path (strict reverse path filtering)
         fib saddr . iif oif missing counter drop
@@ -51,6 +52,7 @@ table inet filter {
         # handle new TCP connections beyond rate limit via synproxy to avoid conntrack table exhaustion
         tcp dport { 22, 25, 80, 443, 465, 993 } tcp flags syn limit rate over 1024/second burst 128 packets counter notrack accept
 
+        meta l4proto { tcp, udp } accept
         meta l4proto { icmp, ipv6-icmp } notrack accept
     }
 

nftables/nftables-matrix.conf

@@ -25,6 +25,7 @@ table inet filter {
 
     chain prerouting-raw {
         type filter hook prerouting priority raw
+        policy drop
 
         # drop packets without a reverse path (strict reverse path filtering)
         fib saddr . iif oif missing counter drop
@@ -39,6 +40,7 @@ table inet filter {
         # handle new TCP connections beyond rate limit via synproxy to avoid conntrack table exhaustion
         tcp dport { 22, 80, 443 } tcp flags syn limit rate over 1024/second burst 128 packets counter notrack accept
 
+        meta l4proto { tcp, udp } accept
         meta l4proto { icmp, ipv6-icmp } notrack accept
     }
 

nftables/nftables-network.conf

@@ -33,6 +33,7 @@ table inet filter {
 
     chain prerouting-raw {
         type filter hook prerouting priority raw
+        policy drop
 
         # drop packets without a reverse path (strict reverse path filtering)
         fib saddr . iif oif missing counter drop
@@ -48,6 +49,8 @@ table inet filter {
         tcp dport { 22, 80, 443, 7275 } tcp flags syn limit rate over 1024/second burst 128 packets counter notrack accept
 
         udp dport 123 notrack accept
+
+        meta l4proto { tcp, udp } accept
         meta l4proto { icmp, ipv6-icmp } notrack accept
     }
 

nftables/nftables-ns1.conf

@@ -25,6 +25,7 @@ table inet filter {
 
     chain prerouting-raw {
         type filter hook prerouting priority raw
+        policy drop
 
         # drop packets without a reverse path (strict reverse path filtering)
         fib saddr . iif oif missing counter drop
@@ -41,6 +42,7 @@ table inet filter {
         # handle new TCP connections beyond rate limit via synproxy to avoid conntrack table exhaustion
         tcp dport { 22, 53, 80, 443, 853 } tcp flags syn limit rate over 1024/second burst 128 packets counter notrack accept
 
+        meta l4proto { tcp, udp } accept
         meta l4proto { icmp, ipv6-icmp } notrack accept
     }
 

nftables/nftables-ns2.conf

@@ -35,6 +35,7 @@ table inet filter {
 
     chain prerouting-raw {
         type filter hook prerouting priority raw
+        policy drop
 
         # drop packets without a reverse path (strict reverse path filtering)
         fib saddr . iif oif missing counter drop
@@ -53,6 +54,7 @@ table inet filter {
         # handle new TCP connections beyond rate limit via synproxy to avoid conntrack table exhaustion
         tcp dport { 22, 53, 80, 443, 853 } tcp flags syn limit rate over 1024/second burst 128 packets counter notrack accept
 
+        meta l4proto { tcp, udp } accept
         meta l4proto { icmp, ipv6-icmp } notrack accept
     }
 

nftables/nftables-social.conf

@@ -25,6 +25,7 @@ table inet filter {
 
     chain prerouting-raw {
         type filter hook prerouting priority raw
+        policy drop
 
         # drop packets without a reverse path (strict reverse path filtering)
         fib saddr . iif oif missing counter drop
@@ -39,6 +40,7 @@ table inet filter {
         # handle new TCP connections beyond rate limit via synproxy to avoid conntrack table exhaustion
         tcp dport { 22, 80, 443 } tcp flags syn limit rate over 1024/second burst 128 packets counter notrack accept
 
+        meta l4proto { tcp, udp } accept
         meta l4proto { icmp, ipv6-icmp } notrack accept
     }
 

nftables/nftables-web.conf

@@ -35,6 +35,7 @@ table inet filter {
 
     chain prerouting-raw {
         type filter hook prerouting priority raw
+        policy drop
 
         # drop packets without a reverse path (strict reverse path filtering)
         fib saddr . iif oif missing counter drop
@@ -49,6 +50,7 @@ table inet filter {
         # handle new TCP connections beyond rate limit via synproxy to avoid conntrack table exhaustion
         tcp dport { 22, 80, 443 } tcp flags syn limit rate over 1024/second burst 128 packets counter notrack accept
 
+        meta l4proto { tcp, udp } accept
         meta l4proto { icmp, ipv6-icmp } notrack accept
     }