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extended option
SIMPLE RULESET FOR A SERVER Simple ruleset for a server. Here's a very basic example of the nftables.conf file you might use on a web server. In this example, we have the option to block off all incoming traffic from the server except from "safe" IP ranges. This is handy if your server is behindCloudFlare, Sucuri,
MATCHING PACKET HEADERS You can also match packets on IEEE 802.1Q VLAN fields, if present: . vlan type «ether_type» - always vlan for 802.1Q; vlan id «12-bit integer» - match VID, the VLAN ID; vlan cfi «1-bit integer» - match DEI, Drop Eligible Indicator (formerly CFI, Canonical Format Indicator) ; vlan pcp «3-bit integer» - match IEEE P802.1p PCP, Priority Code Point; Do not forget that the layer 2 headerCONFIGURING CHAINS
Configuring chains. As in iptables, with nftables you attach your rules to chains. Unlike in iptables, there are no predefined chains like INPUT, OUTPUT, etc. Instead, to filter packets at a particular processing step, you explicitly create a base chain with name of yourchoosing, and
MATCHING ROUTING INFORMATION The directly connected IP address that an outgoing packet is sent to, which can be used either for matching or accounting, eg: nft add rule filter postrouting ip daddr 192.168.1.0/24 rt nexthop != 192.168.0.1 drop. This will drop any traffic to 192.168.1.0/24 that is not routed via 192.168.0.1. nft add rule filter postrouting meter acct { rt PERFORMING NETWORK ADDRESS TRANSLATION (NAT) The stateful NAT involves the nf_conntrack kernel engine to match/set packet stateful information and will engage according to the state of connections. This is the most common way of performing NAT and the approach we recommend you to follow. Be aware that with kernel versions before 4.18, you have to register the prerouting/postroutingchains
JUMPING TO CHAIN
Jumping to chain. It's often beneficial to structure your ruleset using a tree of chains. To do so, you first need to create at least one regular chain via: The example above creates the tcp-chain which will be used to add rules to filter tcp traffic, eg. We can just add asimple
NETFILTER/IPTABLES PROJECT HOMEPAGE The netfilter project is a community-driven collaborative FOSS project that provides packet filtering software for the Linux 2.4.x and later kernel series. The netfilter project is commonly associated with iptables and its successor nftables.. The netfilter project enables packet filtering, network address translation (NAT), packet logging, userspace packet queueing and other NFTABLES WIKIRATE LIMITING MATCHINGSNFTABLES FAMILIESNFTABLES FROM DISTRIBUTIONSCONFIGURING CHAINS Welcome to the nftables HOWTO documentation page. Here you will find documentation on how to build, install, configure and use nftables. If you have any suggestion to improve it, please send your comments to Netfilter users mailing list . DATA TYPES - NFTABLES WIKI Data types used in Netfilter. The following data types are used in nft expressions to select matching packets: Sunday = 0, Saturday = 6. Symbolic constants are case insensitive, and unique abbreviations are accepted: Sun = sun = Sunday = 0. Device group (32 bit integer). Can be specified numerically or as symbolic name defined in /etc/iproute2 MATCHING CONNECTION TRACKING STATEFUL Conntrack itself maintains most of its metadata for each tracked connection. The conntrack command-line tool makes it easy to list these metadata as well as manage the connections. Following is a sample partial output, run on a host serving an active sshd session. The id option includes the unique conntrack id in the output; theextended option
SIMPLE RULESET FOR A SERVER Simple ruleset for a server. Here's a very basic example of the nftables.conf file you might use on a web server. In this example, we have the option to block off all incoming traffic from the server except from "safe" IP ranges. This is handy if your server is behindCloudFlare, Sucuri,
MATCHING PACKET HEADERS You can also match packets on IEEE 802.1Q VLAN fields, if present: . vlan type «ether_type» - always vlan for 802.1Q; vlan id «12-bit integer» - match VID, the VLAN ID; vlan cfi «1-bit integer» - match DEI, Drop Eligible Indicator (formerly CFI, Canonical Format Indicator) ; vlan pcp «3-bit integer» - match IEEE P802.1p PCP, Priority Code Point; Do not forget that the layer 2 headerCONFIGURING CHAINS
Configuring chains. As in iptables, with nftables you attach your rules to chains. Unlike in iptables, there are no predefined chains like INPUT, OUTPUT, etc. Instead, to filter packets at a particular processing step, you explicitly create a base chain with name of yourchoosing, and
MATCHING ROUTING INFORMATION The directly connected IP address that an outgoing packet is sent to, which can be used either for matching or accounting, eg: nft add rule filter postrouting ip daddr 192.168.1.0/24 rt nexthop != 192.168.0.1 drop. This will drop any traffic to 192.168.1.0/24 that is not routed via 192.168.0.1. nft add rule filter postrouting meter acct { rt PERFORMING NETWORK ADDRESS TRANSLATION (NAT) The stateful NAT involves the nf_conntrack kernel engine to match/set packet stateful information and will engage according to the state of connections. This is the most common way of performing NAT and the approach we recommend you to follow. Be aware that with kernel versions before 4.18, you have to register the prerouting/postroutingchains
JUMPING TO CHAIN
Jumping to chain. It's often beneficial to structure your ruleset using a tree of chains. To do so, you first need to create at least one regular chain via: The example above creates the tcp-chain which will be used to add rules to filter tcp traffic, eg. We can just add asimple
BUILDING AND INSTALLING NFTABLES FROM SOURCES Other family modules are nf_tables_ipv6, nf_tables_bridge, nf_tables_arp and (since Linux kernel >= 3.14) nf_tables_inet.. These modules provide the corresponding table and the filter chain support for the given family.. You could also check which modules are supported by your current kernel. How to to do this, depends on yourdistro:
TROUBLESHOOTING
If I try to start nft, I get this error: % nft list table filter :1:1-17: Error: Could not receive sets from kernel: Address family not supported by protocol list table filter ^^^^^^^^^^^^^^^^^. Answer: You have to create the table before you can actually list it, ie. nft add table filter. Please, see how to configure tables. MATCHING ROUTING INFORMATION The directly connected IP address that an outgoing packet is sent to, which can be used either for matching or accounting, eg: nft add rule filter postrouting ip daddr 192.168.1.0/24 rt nexthop != 192.168.0.1 drop. This will drop any traffic to 192.168.1.0/24 that is not routed via 192.168.0.1. nft add rule filter postrouting meter acct { rtJUMPING TO CHAIN
Jumping to chain. It's often beneficial to structure your ruleset using a tree of chains. To do so, you first need to create at least one regular chain via: The example above creates the tcp-chain which will be used to add rules to filter tcp traffic, eg. We can just add asimple
NETFILTER HOOKS
Priority within hook. Within a given hook, Netfilter performs operations in order of increasing numerical priority. Each nftables base chain and flowtable is assigned a priority that defines its ordering among other base chains and flowtables and Netfilter internal operations at the same hook. For example, a chain on the prerouting hook with priority -300 will be placed before connection SETTING PACKET METAINFORMATION You can set the priority of a packet. This example shows a similar operation to what "-j CLASSIFY" does in iptables: % nft add table mangle % nft add chain postrouting {type route hook output priority -150 \; } % nft add rule mangle postrouting tcp sport 80 meta priority set 1. Warning: There is a bug in the priority syntax that will befixed
SETTING PACKET CONNECTION TRACKING notrack - Bypass connection tracking. You can use the notrack statement (added in Linux kernel 4.9, nftables 0.7) to explicitly skip connection tracking for matched packets. To be effective your notrack rule must come before conntrack is triggered.You can ensure this by attaching it to a base chain with prerouting hook and priority < NF_IP_PRI_CONNTRACK (-200). USING CONFIGURATION MANAGEMENT SYSTEMS Using configuration management systems. This page shows a basic example on how to integrate nftables scripting capabilities with configuration management systems (like puppet, ansible, chef, salt and others). The basic approach is to have a central point where we deploy nftables, with a ruleset layout that allows other files to be deployedand
CONNTRACK HELPERS
Some internet protocols use multiple ports that are negotiated between endpoints during the initial connection. Netfilter's connection tracking system uses protocol helpers that look inside these negotiation packets to determine which ports will be part of the connection. The ct helper tells conntrack to expect packets to these ports; when such packets arrive conntrack assigns them related status.REJECTING TRAFFIC
port-unreachable: Port unreachable. From the inet family, you can use an abstraction, the so-called icmpx, to reject the IPv4 and IPv6 traffic using one single rule. For example: % nft add rule inet filter input reject with icmpx type no-route. This rule rejects IPv4 traffic with the reason "net unreachable" and the IPv6 traffic with the reason NETFILTER/IPTABLES PROJECT HOMEPAGE The netfilter project is a community-driven collaborative FOSS project that provides packet filtering software for the Linux 2.4.x and later kernel series. The netfilter project is commonly associated with iptables and its successor nftables.. The netfilter project enables packet filtering, network address translation (NAT), packet logging, userspace packet queueing and other DATA TYPES - NFTABLES WIKI Data types used in Netfilter. The following data types are used in nft expressions to select matching packets: Sunday = 0, Saturday = 6. Symbolic constants are case insensitive, and unique abbreviations are accepted: Sun = sun = Sunday = 0. Device group (32 bit integer). Can be specified numerically or as symbolic name defined in /etc/iproute2 MATCHING PACKET HEADERS You can also match packets on IEEE 802.1Q VLAN fields, if present: . vlan type «ether_type» - always vlan for 802.1Q; vlan id «12-bit integer» - match VID, the VLAN ID; vlan cfi «1-bit integer» - match DEI, Drop Eligible Indicator (formerly CFI, Canonical Format Indicator) ; vlan pcp «3-bit integer» - match IEEE P802.1p PCP, Priority Code Point; Do not forget that the layer 2 header DATA TYPES - NFTABLES WIKI Netfilter Data Types Data Type Description nft Expressions Notes day Day of week of packet reception (8 bit integer, with pre-defined symbolic constants): Sunday MATCHING ROUTING INFORMATION The directly connected IP address that an outgoing packet is sent to, which can be used either for matching or accounting, eg: nft add rule filter postrouting ip daddr 192.168.1.0/24 rt nexthop != 192.168.0.1 drop. This will drop any traffic to 192.168.1.0/24 that is not routed via 192.168.0.1. nft add rule filter postrouting meter acct { rt MATCHING CONNECTION TRACKING STATEFUL Conntrack itself maintains most of its metadata for each tracked connection. The conntrack command-line tool makes it easy to list these metadata as well as manage the connections. Following is a sample partial output, run on a host serving an active sshd session. The id option includes the unique conntrack id in the output; theextended option
PERFORMING NETWORK ADDRESS TRANSLATION (NAT) The stateful NAT involves the nf_conntrack kernel engine to match/set packet stateful information and will engage according to the state of connections. This is the most common way of performing NAT and the approach we recommend you to follow. Be aware that with kernel versions before 4.18, you have to register the prerouting/postroutingchains
USING CONFIGURATION MANAGEMENT SYSTEMS Using configuration management systems. This page shows a basic example on how to integrate nftables scripting capabilities with configuration management systems (like puppet, ansible, chef, salt and others). The basic approach is to have a central point where we deploy nftables, with a ruleset layout that allows other files to be deployedand
JUMPING TO CHAIN
Jumping to chain. It's often beneficial to structure your ruleset using a tree of chains. To do so, you first need to create at least one regular chain via: The example above creates the tcp-chain which will be used to add rules to filter tcp traffic, eg. We can just add asimple
CONNTRACK HELPERS
Some internet protocols use multiple ports that are negotiated between endpoints during the initial connection. Netfilter's connection tracking system uses protocol helpers that look inside these negotiation packets to determine which ports will be part of the connection. The ct helper tells conntrack to expect packets to these ports; when such packets arrive conntrack assigns them related status. NETFILTER/IPTABLES PROJECT HOMEPAGE The netfilter project is a community-driven collaborative FOSS project that provides packet filtering software for the Linux 2.4.x and later kernel series. The netfilter project is commonly associated with iptables and its successor nftables.. The netfilter project enables packet filtering, network address translation (NAT), packet logging, userspace packet queueing and other DATA TYPES - NFTABLES WIKI Data types used in Netfilter. The following data types are used in nft expressions to select matching packets: Sunday = 0, Saturday = 6. Symbolic constants are case insensitive, and unique abbreviations are accepted: Sun = sun = Sunday = 0. Device group (32 bit integer). Can be specified numerically or as symbolic name defined in /etc/iproute2 MATCHING PACKET HEADERS You can also match packets on IEEE 802.1Q VLAN fields, if present: . vlan type «ether_type» - always vlan for 802.1Q; vlan id «12-bit integer» - match VID, the VLAN ID; vlan cfi «1-bit integer» - match DEI, Drop Eligible Indicator (formerly CFI, Canonical Format Indicator) ; vlan pcp «3-bit integer» - match IEEE P802.1p PCP, Priority Code Point; Do not forget that the layer 2 header DATA TYPES - NFTABLES WIKI Netfilter Data Types Data Type Description nft Expressions Notes day Day of week of packet reception (8 bit integer, with pre-defined symbolic constants): Sunday MATCHING ROUTING INFORMATION The directly connected IP address that an outgoing packet is sent to, which can be used either for matching or accounting, eg: nft add rule filter postrouting ip daddr 192.168.1.0/24 rt nexthop != 192.168.0.1 drop. This will drop any traffic to 192.168.1.0/24 that is not routed via 192.168.0.1. nft add rule filter postrouting meter acct { rt MATCHING CONNECTION TRACKING STATEFUL Conntrack itself maintains most of its metadata for each tracked connection. The conntrack command-line tool makes it easy to list these metadata as well as manage the connections. Following is a sample partial output, run on a host serving an active sshd session. The id option includes the unique conntrack id in the output; theextended option
PERFORMING NETWORK ADDRESS TRANSLATION (NAT) The stateful NAT involves the nf_conntrack kernel engine to match/set packet stateful information and will engage according to the state of connections. This is the most common way of performing NAT and the approach we recommend you to follow. Be aware that with kernel versions before 4.18, you have to register the prerouting/postroutingchains
USING CONFIGURATION MANAGEMENT SYSTEMS Using configuration management systems. This page shows a basic example on how to integrate nftables scripting capabilities with configuration management systems (like puppet, ansible, chef, salt and others). The basic approach is to have a central point where we deploy nftables, with a ruleset layout that allows other files to be deployedand
JUMPING TO CHAIN
Jumping to chain. It's often beneficial to structure your ruleset using a tree of chains. To do so, you first need to create at least one regular chain via: The example above creates the tcp-chain which will be used to add rules to filter tcp traffic, eg. We can just add asimple
CONNTRACK HELPERS
Some internet protocols use multiple ports that are negotiated between endpoints during the initial connection. Netfilter's connection tracking system uses protocol helpers that look inside these negotiation packets to determine which ports will be part of the connection. The ct helper tells conntrack to expect packets to these ports; when such packets arrive conntrack assigns them related status.NFTABLES WIKI
Welcome to the nftables HOWTO documentation page. Here you will find documentation on how to build, install, configure and use nftables. If you have any suggestion to improve it, please send your comments to Netfilter users mailing list . QUICK REFERENCE-NFTABLES IN 10 MINUTES The argument -n shows the addresses and other information that uses names in numeric format. The -a argument is used to display the handle.. Chains. type refers to the kind of chain to be created. Possible types are: filter: Supported by arp, bridge, ip, ip6 and inet table families.; route: Mark packets (like mangle for the output hook, for other hooks use the type filter instead), supported DATA TYPES - NFTABLES WIKI Netfilter Data Types Data Type Description nft Expressions Notes day Day of week of packet reception (8 bit integer, with pre-defined symbolic constants): SundayCONFIGURING CHAINS
Configuring chains. As in iptables, with nftables you attach your rules to chains. Unlike in iptables, there are no predefined chains like INPUT, OUTPUT, etc. Instead, to filter packets at a particular processing step, you explicitly create a base chain with name of yourchoosing, and
TROUBLESHOOTING
If I try to start nft, I get this error: % nft list table filter :1:1-17: Error: Could not receive sets from kernel: Address family not supported by protocol list table filter ^^^^^^^^^^^^^^^^^. Answer: You have to create the table before you can actually list it, ie. nft add table filter. Please, see how to configure tables. MOVING FROM IPTABLES TO NFTABLES Moving from iptables to nftables. This page gives information on moving/migrating from the old iptables/xtables (legacy) world to the new nftables framework. A common situation is the need to move from an existing iptables ruleset to nftables. The Netfilter team has created some tools and mechanisms to ease in this move.LOGGING TRAFFIC
The most simple rule to log all incoming traffic is: % nft add rule filter input log. A typical rule match, log and accept incoming ssh traffic looks like: % nft add rule filter input tcp dport 22 ct state new log prefix \" New SSH connection: \" accept. The prefix indicatesthe
USING CONFIGURATION MANAGEMENT SYSTEMS Using configuration management systems. This page shows a basic example on how to integrate nftables scripting capabilities with configuration management systems (like puppet, ansible, chef, salt and others). The basic approach is to have a central point where we deploy nftables, with a ruleset layout that allows other files to be deployedand
MATCHING ROUTING INFORMATION The directly connected IP address that an outgoing packet is sent to, which can be used either for matching or accounting, eg: nft add rule filter postrouting ip daddr 192.168.1.0/24 rt nexthop != 192.168.0.1 drop. This will drop any traffic to 192.168.1.0/24 that is not routed via 192.168.0.1. nft add rule filter postrouting meter acct { rtCONNTRACK HELPERS
Some internet protocols use multiple ports that are negotiated between endpoints during the initial connection. Netfilter's connection tracking system uses protocol helpers that look inside these negotiation packets to determine which ports will be part of the connection. The ct helper tells conntrack to expect packets to these ports; when such packets arrive conntrack assigns them related status.home | download
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Supporting netfilter THE NETFILTER.ORG PROJECT WHAT IS THE NETFILTER.ORG PROJECT? The netfilter project is a community-driven collaborative FOSSproject
that provides packet filtering software for the Linux 2.4.x and later kernel series. The netfilter project is commonly associated with iptables and its successor nftables.
The netfilter project enables packet filtering, network address translation (NAT), packet logging, userspace packet queueing and other packet mangling. The netfilter hooks are a framework inside the Linux kernel that allows kernel modules to register callback functions at different locations of the Linux network stack. The registered callback function is then called back for every packet that traverses the respective hook within the Linux network stack. iptables is a generic firewalling software that allows you to define rulesets. Each rule within an IP table consists of a number of classifiers (iptables matches) and one connected action (iptables target). nftables is the successor of iptables , it allows for much more flexible, scalable and performance packet classification. This is where all the fancy new features are developed.MAIN FEATURES
* stateless packet filtering (IPv4 and IPv6) * stateful packet filtering (IPv4 and IPv6) * all kinds of network address and port translation, e.g. NAT/NAPT(IPv4 and IPv6)
* flexible and extensible infrastructure * multiple layers of API's for 3rd party extensions WHAT CAN I DO WITH NETFILTER? * build internet firewalls based on stateless and stateful packetfiltering
* deploy highly available stateless and stateful firewall clusters * use NAT and masquerading for sharing internet access if you don't have enough public IP addresses * use NAT to implement transparent proxies * aid the tc and iproute2 systems used to build sophisticated QoS andpolicy routers
* do further packet manipulation (mangling) like altering the TOS/DSCP/ECN bits of the IP header WHAT VALUE DOES NFTABLES PROVIDE? * a single tool with consistent syntax as opposed to the fragmented {ip,ip6,eb,arp}tables and ipset * faster kernel-side transactional ruleset updates, no need foruser-space locking
* sets are more flexible and powerful than ipset, maps push the concept even further * full ruleset flexibility: * no pre-defined tables and chains * arbitrary number of user-defined tables to separate the rulesetinto "namespaces"
* base chain's hook and priority are configurable * more flexible rules: No mandatory parts (like counters), multiple actions allowed (e.g. log and drop) * ingress hook attaching a chain to an interface for early filteringright after TC
* flowtables provide a software fast path and hardware acceleration * some limited scripting ability embedded in the syntax (define variables, include other files), support for extensive scripting via JSON input and outputLICENSING TERMS
netfilter.org develops software within the Linux kernel, which is released under the terms of the GNU General Public License version 2 (GPL-2.0) and compatible licenses. This project also provides userspace libraries and utilities that are released under the GPL-2.0, please consult licensing terms of each library and userspace tool specifically for details. For more information, you can consult our licensing section . Copyright © 1999-2021 The Netfilter's webmasters . Contact webmasterDetails
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