branch: externals/nftables-mode
commit 103844fb4163415705597ff73b88609d082e9643
Author: Trent W. Buck <trentb...@gmail.com>
Commit: Trent W. Buck <trentb...@gmail.com>
move the ICMPv6 policy to a separate named map, so it's out of the way
---
nftables-host.nft | 80 ++++++++++++++++++++++++++++++-------------------------
1 file changed, 43 insertions(+), 37 deletions(-)
diff --git a/nftables-host.nft b/nftables-host.nft
index 48e6ded1be..01ddc68e2f 100644
--- a/nftables-host.nft
+++ b/nftables-host.nft
@@ -78,47 +78,14 @@ table inet my_filter {
# Loopback traffic is needed for e.g. NFS RPC, and for debugging.
# NOTE: assumes exactly one loopback interface named "lo" that already
exists.
# FIXME: why "iif lo" not "ifftype loopback"? Is it just inertia?
- iiftype loopback accept
+ iiftype loopback accept
# Allow arbitrary IPv4/ICMP and IPv6/ICMPv6.
# FIXME: this is too broad -- narrow this!
# FIXME: rate-limit (some) ICMPv4 by source IP?
- ip protocol icmp accept
-
- # Allow all ICMPv6 is wrong (insecure);
- # Deny all ICMPv6 is wrong (breaks IPv6).
- # The following vmap merges RFC 4890 4.4 (for hosts) and 4.4 (for
routers).
- # Fortunately, the only verdict conflicts occur in
- # "Traffic That Will Be Dropped Anyway" sections, so we can share this
vmap
- # between hook input (host) and hook forward (router).
- #
- # I *think* "dropped anyway" also means we also don't need these:
- # ip6 hoplimit 1 # for LLMNR
- # ip6 hoplimit 255 # for RA/RS/NA/NS
- # ip6 saddr fe80::/10 # for LLMNR and MLD
- icmpv6 type vmap {
- 1 - 4: accept, # RFC 4890 4.3.1 & 4.4.1 essential errors
- 128 - 129: accept, # RFC 4890 4.3.1 & 4.4.1 Echo (ping)
- 144 - 147: accept, # RFC 4890 4.3.2 & 4.4.3 Mobile IPv6
- 133 - 136: accept, # RFC 4890 4.3.3 & 4.4.1 (replaces ARP and
DHCPv4)
- 141 - 142: accept, # RFC 4890 4.3.3 & 4.4.1 (replaces ARP and
DHCPv4)
- 130 - 132: accept, # RFC 4890 4.3.3 & 4.4.1 LLMNR
- 143: accept, # RFC 4890 4.3.3 & 4.4.1 LLMNR
- 148 - 149: accept, # RFC 4890 4.3.3 & 4.4.1 SEND
- 151 - 153: accept, # RFC 4890 4.3.3 & 4.4.1 Multicast Router
- 137: drop, # RFC 4890 4.3.3 & 4.4.4 Redirect
- 150: drop, # RFC 4890 4.3.4 & 4.4.3 Seamoby
- 5 - 99: drop, # RFC 4890 4.3.4 & 4.4.4 unallocated error
messages
- 102 - 126: drop, # RFC 4890 4.3.4 & 4.4.4 unallocated error
messages
- 154 - 199: drop, # RFC 4890 4.3.4 & 4.4.? unallocated
informational messages
- 202 - 254: drop, # RFC 4890 4.3.4 & 4.4.? unallocated
informational messages
- 138: drop, # RFC 4890 4.3.5 & 4.4.3 route renumbering
- 100 - 101: drop, # RFC 4890 4.3.5 & 4.4.5 experimental
allocations
- 200 - 201: drop, # RFC 4890 4.3.5 & 4.4.5 experimental
allocations
- 127: drop, # RFC 4890 4.3.5 & 4.4.5 extension type numbers
- 139 - 140: drop, # RFC 4890 4.3.5 & 4.4.4 Node Information
- 255: drop, # RFC 4890 4.3.5 & 4.4.5 extension type numbers
- }
+ ip protocol icmp accept
+ # FIXME: should we limit to "ip6 nexthdr icmpv6"?
+ icmpv6 type vmap @ICMPv6_RFC4890_policy
# YOUR RULES HERE.
# NOTE: service names resolve via nss (/etc/hosts) only in nft 0.9.1+!
@@ -151,6 +118,45 @@ table inet my_filter {
# We want output to be "allow all", so we don't even create a chain.
+
+ # Allow all ICMPv6 is wrong (insecure);
+ # Deny all ICMPv6 is wrong (breaks IPv6).
+ # The following vmap merges RFC 4890 4.4 (for hosts) and 4.4 (for routers).
+ # Fortunately, the only verdict conflicts occur in
+ # "Traffic That Will Be Dropped Anyway" sections, so we can share this vmap
+ # between hook input (host) and hook forward (router).
+ #
+ # I *think* "dropped anyway" also means we also don't need these:
+ # ip6 hoplimit 1 # for LLMNR
+ # ip6 hoplimit 255 # for RA/RS/NA/NS
+ # ip6 saddr fe80::/10 # for LLMNR and MLD
+ map ICMPv6_RFC4890_policy {
+ type icmpv6_type : verdict
+ flags interval
+ elements = {
+ 1 - 4: accept, # RFC 4890 4.3.1 & 4.4.1 essential errors
+ 128 - 129: accept, # RFC 4890 4.3.1 & 4.4.1 Echo (ping)
+ 144 - 147: accept, # RFC 4890 4.3.2 & 4.4.3 Mobile IPv6
+ 133 - 136: accept, # RFC 4890 4.3.3 & 4.4.1 (replaces ARP and
DHCPv4)
+ 141 - 142: accept, # RFC 4890 4.3.3 & 4.4.1 (replaces ARP and
DHCPv4)
+ 130 - 132: accept, # RFC 4890 4.3.3 & 4.4.1 LLMNR
+ 143: accept, # RFC 4890 4.3.3 & 4.4.1 LLMNR
+ 148 - 149: accept, # RFC 4890 4.3.3 & 4.4.1 SEND
+ 151 - 153: accept, # RFC 4890 4.3.3 & 4.4.1 Multicast Router
+ 137: drop, # RFC 4890 4.3.3 & 4.4.4 Redirect
+ 150: drop, # RFC 4890 4.3.4 & 4.4.3 Seamoby
+ 5 - 99: drop, # RFC 4890 4.3.4 & 4.4.4 unallocated error
messages
+ 102 - 126: drop, # RFC 4890 4.3.4 & 4.4.4 unallocated error
messages
+ 154 - 199: drop, # RFC 4890 4.3.4 & 4.4.? unallocated
informational messages
+ 202 - 254: drop, # RFC 4890 4.3.4 & 4.4.? unallocated
informational messages
+ 138: drop, # RFC 4890 4.3.5 & 4.4.3 route renumbering
+ 100 - 101: drop, # RFC 4890 4.3.5 & 4.4.5 experimental
allocations
+ 200 - 201: drop, # RFC 4890 4.3.5 & 4.4.5 experimental
allocations
+ 127: drop, # RFC 4890 4.3.5 & 4.4.5 extension type numbers
+ 139 - 140: drop, # RFC 4890 4.3.5 & 4.4.4 Node Information
+ 255: drop, # RFC 4890 4.3.5 & 4.4.5 extension type numbers
+ }
+ }
}
list ruleset
