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* src: introduce SYNPROXY matchingFernando Fernandez Mancera2019-07-171-0/+11
| | | | | | | | | | | | | | | | | | | | Add support for "synproxy" statement. For example (for TCP port 8888): table ip x { chain y { type filter hook prerouting priority raw; policy accept; tcp dport 8888 tcp flags syn notrack } chain z { type filter hook input priority filter; policy accept; tcp dport 8888 ct state invalid,untracked synproxy mss 1460 wscale 7 timestamp sack-perm ct state invalid drop } } Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: statement: disable reject statement type omission for bridgeFlorian Westphal2019-06-191-1/+2
| | | | | | | | | | | | | add rule bridge test-bridge input reject with icmp type port-unreachable ... will be printed as 'reject', which is fine on ip family, but not on bridge -- 'with icmp type' adds an ipv4 dependency, but simple reject does not (it will use icmpx to also reject ipv6 packets with an icmpv6 error). Add a toggle to supress short-hand versions in this case. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add nat support for the inet familyFlorian Westphal2019-04-091-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | consider a simple ip6 nat table: table ip6 nat { chain output { type nat hook output priority 0; policy accept; dnat to dead:2::99 } Now consider same ruleset, but using 'table inet nat': nft now lacks context to determine address family to parse 'to $address'. This adds code to make the following work: table inet nat { [ .. ] # detect af from network protocol context: ip6 daddr dead::2::1 dnat to dead:2::99 # use new dnat ip6 keyword: dnat ip6 to dead:2::99 } On list side, the keyword is only shown in the inet family, else the short version (dnat to ...) is used as the family is redundant when the table already mandates the ip protocol version supported. Address mismatches such as table ip6 { .. dnat ip to 1.2.3.4 are detected/handled during the evaluation phase. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: remove opts field from struct xt_stmtPablo Neira Ayuso2018-10-171-1/+0
| | | | | | | | This is never used, ie. always NULL. Reported-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Acked-by: Phil Sutter <phil@nwl.cc>
* src: integrate stateful expressions into sets and mapsPablo Neira Ayuso2018-08-241-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The following example shows how to populate a set from the packet path using the destination IP address, for each entry there is a counter. The entry expires after the 1 hour timeout if no packets matching this entry are seen. table ip x { set xyz { type ipv4_addr size 65535 flags dynamic,timeout timeout 1h } chain y { type filter hook output priority filter; policy accept; update @xyz { ip daddr counter } counter } } Similar example, that creates a mapping better IP address and mark, where the mark is assigned using an incremental sequence generator from 0 to 1 inclusive. table ip x { map xyz { type ipv4_addr : mark size 65535 flags dynamic,timeout timeout 1h } chain y { type filter hook input priority filter; policy accept; update @xyz { ip saddr counter : numgen inc mod 2 } } } Supported stateful statements are: limit, quota, counter and connlimit. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: simplify map statementPablo Neira Ayuso2018-08-241-1/+2
| | | | | | | Instead of using the map expression, store dynamic key and data separately since they need special handling than constant maps. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: Add tproxy supportMáté Eckl2018-08-031-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support for transparent proxy functionality which is supported in ip, ip6 and inet tables. The syntax is the following: tproxy [{|ip|ip6}] to {<ip address>|:<port>|<ip address>:<port>} It looks for a socket listening on the specified address or port and assigns it to the matching packet. In an inet table, a packet matches for both families until address is specified. Network protocol family has to be specified **only** in inet tables if address is specified. As transparent proxy support is implemented for sockets with layer 4 information, a transport protocol header criterion has to be set in the same rule. eg. 'meta l4proto tcp' or 'udp dport 4444' Example ruleset: table ip x { chain y { type filter hook prerouting priority -150; policy accept; tcp dport ntp tproxy to 1.1.1.1 udp dport ssh tproxy to :2222 } } table ip6 x { chain y { type filter hook prerouting priority -150; policy accept; tcp dport ntp tproxy to [dead::beef] udp dport ssh tproxy to :2222 } } table inet x { chain y { type filter hook prerouting priority -150; policy accept; tcp dport 321 tproxy to :ssh tcp dport 99 tproxy ip to 1.1.1.1:999 udp dport 155 tproxy ip6 to [dead::beef]:smux } } Signed-off-by: Máté Eckl <ecklm94@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* expr: extend fwd statement to support address and familyPablo Neira Ayuso2018-06-061-1/+3
| | | | | | | | Allow to forward packets through to explicit destination and interface. nft add rule netdev x y fwd ip to 192.168.2.200 device eth0 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: connlimit supportPablo Neira Ayuso2018-06-061-0/+10
| | | | | | | | | | | | | | This patch adds support for the new connlimit stateful expression, that provides a mapping with the connlimit iptables extension through meters. eg. nft add rule filter input tcp dport 22 \ meter test { ip saddr ct count over 2 } counter reject This limits the maximum amount incoming of SSH connections per source address up to 2 simultaneous connections. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Implement JSON output supportPhil Sutter2018-05-111-0/+3
| | | | | | | | | | | | Although technically there already is support for JSON output via 'nft export json' command, it is hardly useable since it exports all the gory details of nftables VM. Also, libnftables has no control over what is exported since the content comes directly from libnftnl. Instead, implement JSON format support for regular 'nft list' commands. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Introduce a few helper functionsPhil Sutter2018-05-111-0/+3
| | | | | | | | | | | | | | | This adds a bunch of functions for conversion of different values into string (and vice-versa). * log_level_parse(): A simple helper to turn log level string representation into log level value. * nat_etype2str(): Translate nat statement type into string representation. * ct_dir2str(): Convert IP_CT_DIR_* values into string representation. * ct_label2str(): Convert ct_label values into string representation. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Make some functions globally accessiblePhil Sutter2018-05-111-0/+2
| | | | | | | | | | | | | | | This removes static flag and adds header prototype for the following functions: * must_print_eq_op() from src/expression.c * fib_result_str() from src/fib.c * set_policy2str() and chain_policy2str from src/rule.c In fib.h, include linux/netfilter/nf_tables.h to make sure enum nft_fib_result is known when including this file. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Make some arrays globally accessiblePhil Sutter2018-05-111-0/+2
| | | | | | | | | | | | | | | This removes static flag and adds declarations in headers for the following arrays: * ct_templates from src/ct.c * mark_tbl from src/datatype.c * meta_templates and devgroup_tbl from src/meta.c * table_flags_name from src/rule.c * set_stmt_op_names from src/statement.c * tcpopthdr_protocols from src/tcpopt.c Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* meter: enforce presence of a max sizeFlorian Westphal2018-05-021-0/+1
| | | | | | | | | | meters are updated dynamically, so we don't know in advance how large this structure can be. Add a 'size' keyword to specifiy an upper limit and update the old syntax to assume a default max value of 65535. Signed-off-by: Florian Westphal <fw@strlen.de>
* Combine redir and masq statements into natPhil Sutter2018-03-171-22/+10
| | | | | | | | | | | | | | | | | | | All these statements are very similar, handling them with the same code is obvious. The only thing required here is a custom extension of enum nft_nat_types which is used in nat_stmt to distinguish between snat and dnat already. Though since enum nft_nat_types is part of kernel uAPI, create a local extended version containing the additional fields. Note that nat statement printing got a bit more complicated to get the number of spaces right for every possible combination of attributes. Note also that there wasn't a case for STMT_MASQ in rule_parse_postprocess(), which seems like a bug. Since STMT_MASQ became just a variant of STMT_NAT, postprocessing will take place for it now anyway. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: support of dynamic map addition and update of elementsLaura Garcia Liebana2018-03-151-0/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The support of dynamic adds and updates are only available for sets and meters. This patch gives such abilities to maps as well. This patch is useful in cases where dynamic population of maps are required, for example, to maintain a persistence during some period of time. Example: table ip nftlb { map persistencia { type ipv4_addr : mark timeout 1h elements = { 192.168.1.132 expires 59m55s : 0x00000064, 192.168.56.101 expires 59m24s : 0x00000065 } } chain pre { type nat hook prerouting priority 0; policy accept; map update \ { @nh,96,32 : numgen inc mod 2 offset 100 } @persistencia } } An example of the netlink generated sequence: nft --debug=netlink add rule ip nftlb pre map add \ { ip saddr : numgen inc mod 2 offset 100 } @persistencia ip nftlb pre [ payload load 4b @ network header + 12 => reg 1 ] [ numgen reg 2 = inc mod 2 offset 100 ] [ dynset add reg_key 1 set persistencia sreg_data 2 ] Signed-off-by: Laura Garcia Liebana <nevola@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: flow offload supportPablo Neira Ayuso2018-03-051-0/+9
| | | | | | | | | | | | This patch allows us to refer to existing flowtables: # nft add rule x x flow offload @m Packets matching this rule create an entry in the flow table 'm', hence, follow up packets that get to the flowtable at ingress bypass the classic forwarding path. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* Revert ("src: Remove xt_stmt_() functions").Pablo Neira Ayuso2018-01-201-0/+2
| | | | | | | | | Revert commit bce55916b51ec1a4c23322781e3b0c698ecc9561, we need this code in place to properly make translation when iptables-compat loads rules. Reported-by: Duncan Roe <duncan_roe@optusnet.com.au> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: deprecate "flow table" syntax, replace it by "meter"Pablo Neira Ayuso2017-11-241-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | According to bugzilla 1137: "flow tables" should not be syntactically unique. "Flow tables are always named, but they don't conform to the way sets, maps, and dictionaries work in terms of "add" and "delete" and all that. They are also "flow tables" instead of one word like "flows" or "throttle" or something. It seems weird to just have these break the syntactic expectations." Personally, I never liked the reference to "table" since we have very specific semantics in terms of what a "table" is netfilter for long time. This patch promotes "meter" as the new keyword. The former syntax is still accepted for a while, just to reduce chances of breaking things. At some point the former syntax will just be removed. Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1137 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Acked-by: Arturo Borrero Gonzalez <arturo@netfilter.org>
* src: add stateful object support for limitPablo M. Bermudo Garay2017-09-041-0/+1
| | | | | | | | This patch adds support for a new type of stateful object: limit. Creation, deletion and listing operations are supported. Signed-off-by: Pablo M. Bermudo Garay <pablombg@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add tcp options set supportFlorian Westphal2017-08-221-0/+11
| | | | | | | | | | | | This adds support for tcp mss mangling: nft add rule filter input tcp option maxseg size 1200 Its also possible to change other tcp option fields, but maxseg is one of the more useful ones to change. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: Remove xt_stmt_() functions.Varsha Rao2017-08-171-2/+0
| | | | | | | | | Remove functions xt_stmt_alloc(), xt_stmt_release(), xt_stmt_xlate(), xt_stmt_print(), xt_stmt_destroy() as they are not used. Similarly, remove structure xt_stmt_ops. Signed-off-by: Varsha Rao <rvarsha016@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: Pass stateless, numeric, ip2name and handle variables as structure members.Varsha Rao2017-06-181-2/+3
| | | | | | | | | | | | | | | | | libnftables library will be created soon. So declare numeric_output, stateless_output, ip2name_output and handle_output as members of structure output_ctx, instead of global variables. Rename these variables as following, numeric_output -> numeric stateless_output -> stateless ip2name_output -> ip2name handle_output -> handle Also add struct output_ctx *octx as member of struct netlink_ctx. Signed-off-by: Varsha Rao <rvarsha016@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: support zone set statement with optional directionFlorian Westphal2017-02-281-0/+2
| | | | | | | | | | | | nft automatically understands 'ct zone set 1' but when a direction is specified too we get a parser error since they are currently only allowed for plain ct expressions. This permits the existing syntax ('ct original zone') for all tokens with an optional direction also for set statements. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add stateful object reference expressionPablo Neira Ayuso2017-01-031-0/+10
| | | | | | | | | This patch adds a new objref statement to refer to existing stateful objects from rules, eg. # nft add rule filter input counter name test counter Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: listing of stateful objectsPablo Neira Ayuso2017-01-031-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch allows you to dump existing stateful objects, eg. # nft list ruleset table ip filter { counter test { packets 64 bytes 1268 } quota test { over 1 mbytes used 1268 bytes } chain input { type filter hook input priority 0; policy accept; quota name test drop counter name test } } # nft list quotas table ip filter { quota test { over 1 mbytes used 1268 bytes } } # nft list counters table ip filter { counter test { packets 64 bytes 1268 } } Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add used quota supportPablo Neira Ayuso2017-01-031-0/+1
| | | | | | | | | | | | | table ip x { chain y { type filter hook forward priority 0; policy accept; quota over 200 mbytes used 1143 kbytes drop } } This patch allows us to list and to restore used quota. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add log flags syntax supportLiping Zhang2016-11-241-0/+1
| | | | | | | | | | | | | | | | | | | | | Now NF_LOG_XXX is exposed to the userspace, we can set it explicitly. Like iptables LOG target, we can log TCP sequence numbers, TCP options, IP options, UID owning local socket and decode MAC header. Note the log flags are mutually exclusive with group. Some examples are listed below: # nft add rule t c log flags tcp sequence,options # nft add rule t c log flags ip options # nft add rule t c log flags skuid # nft add rule t c log flags ether # nft add rule t c log flags all # nft add rule t c log flags all group 1 <cmdline>:1:14-16: Error: flags and group are mutually exclusive add rule t c log flags all group 1 ^^^ Signed-off-by: Liping Zhang <zlpnobody@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add notrack supportPablo Neira Ayuso2016-11-141-0/+2
| | | | | | | This patch adds the notrack statement, to skip connection tracking for certain packets. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add quota statementPablo Neira Ayuso2016-08-291-0/+10
| | | | | | | | | | | | | This new statement is stateful, so it can be used from flow tables, eg. # nft add rule filter input \ flow table http { ip saddr timeout 60s quota over 50 mbytes } drop This basically sets a quota per source IP address of 50 mbytes after which packets are dropped. Note that the timeout releases the entry if no traffic is seen from this IP after 60 seconds. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add xt compat supportPablo Neira Ayuso2016-07-131-0/+34
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | At compilation time, you have to pass this option. # ./configure --with-xtables And libxtables needs to be installed in your system. This patch allows to list a ruleset containing xt extensions loaded through iptables-compat-restore tool. Example: $ iptables-save > ruleset $ cat ruleset *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -p tcp -m multiport --dports 80,81 -j REJECT COMMIT $ sudo iptables-compat-restore ruleset $ sudo nft list rulseset table ip filter { chain INPUT { type filter hook input priority 0; policy accept; ip protocol tcp tcp dport { 80,81} counter packets 0 bytes 0 reject } chain FORWARD { type filter hook forward priority 0; policy drop; } chain OUTPUT { type filter hook output priority 0; policy accept; } } A translation of the extension is shown if this is available. In other case, match or target definition is preceded by a hash. For example, classify target has not translation: $ sudo nft list chain mangle POSTROUTING table ip mangle { chain POSTROUTING { type filter hook postrouting priority -150; policy accept; ip protocol tcp tcp dport 80 counter packets 0 bytes 0 # CLASSIFY set 20:10 ^^^ } } If the whole ruleset is translatable, the users can (re)load it using "nft -f" and get nft native support for all their rules. This patch is joint work by the authors listed below. Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo M. Bermudo Garay <pablombg@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add flow statementPatrick McHardy2016-05-131-0/+12
| | | | | | | | | | | | | | | The flow statement allows to instantiate per flow statements for user defined flows. This can so far be used for per flow accounting or limiting, similar to what the iptables hashlimit provides. Flows can be aged using the timeout option. Examples: # nft filter input flow ip saddr . tcp dport limit rate 10/second # nft filter input flow table acct iif . ip saddr timeout 60s counter Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* stmt: support generating stateful statements outside of rule contextPatrick McHardy2016-05-131-0/+1
| | | | | | | | | | The flow statement contains a stateful per flow statement, which is not directly part of the rule. Allow generating these statements without adding them to the rule and mark the supported statements using a new flag STMT_F_STATEFUL. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: Add support for masquerade port selectionShivani Bhardwaj2016-03-031-0/+1
| | | | | | | | | Provide full support for masquerading by allowing port range selection, eg. # nft add rule nat postrouting ip protocol tcp masquerade to :1024-10024 Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add fwd statement for netdevPablo Neira Ayuso2016-01-311-0/+10
| | | | | | | | | | | This patch add support for the forward statement, only available at the netdev family. # nft add table netdev filter # nft add chain netdev filter ingress { type filter hook ingress device eth0 priority 0\; } # nft add rule netdev filter ingress fwd to dummy0 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: support limit rate over valuePablo Neira Ayuso2016-01-141-0/+1
| | | | | | | | | | | | | | | | | | So far it was only possible to match packet under a rate limit, this patch allows you to explicitly indicate if you want to match packets that goes over or until the rate limit, eg. ... limit rate over 3/second counter log prefix "OVERLIMIT: " drop ... limit rate over 3 mbytes/second counter log prefix "OVERLIMIT: " drop ... ct state invalid limit rate until 1/second counter log prefix "INVALID: " When listing rate limit until, this shows: ... ct state invalid limit rate 1/second counter log prefix "INVALID: " thus, the existing syntax is still valid (i.e. default to rate limit until). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* payload: add payload statementPatrick McHardy2015-11-251-0/+11
| | | | | | | | | Add support for payload mangling using the payload statement. The syntax is similar to the other data changing statements: nft filter output tcp dport set 25 Signed-off-by: Patrick McHardy <kaber@trash.net>
* src: add dup statement supportPablo Neira Ayuso2015-09-301-0/+10
| | | | | | | | | | This allows you to clone packets to destination address, eg. ... dup to 172.20.0.2 ... dup to 172.20.0.2 device eth1 ... dup to ip saddr map { 192.168.0.2 : 172.20.0.2, ... } device eth1 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add burst parameter to limitPablo Neira Ayuso2015-09-231-0/+1
| | | | | | | | | | | ... limit rate 1024 mbytes/second burst 10240 bytes ... limit rate 1/second burst 3 packets This parameter is optional. You need a Linux kernel >= 4.3-rc1. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add per-bytes limitPablo Neira Ayuso2015-09-231-0/+1
| | | | | | | | | | This example show how to accept packets below the ratelimit: ... limit rate 1024 mbytes/second counter accept You need a Linux kernel >= 4.3-rc1. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* nftables: add set statemetPatrick McHardy2015-04-121-0/+11
| | | | | | | | | | | | The set statement is used to dynamically add or update elements in a set. Syntax: # nft filter input set add tcp dport @myset # nft filter input set add ip saddr timeout 10s @myset # nft filter input set update ip saddr timeout 10s @myset Signed-off-by: Patrick McHardy <kaber@trash.net>
* src: add redirect supportArturo Borrero2014-11-041-0/+10
| | | | | | | | | | | This patch adds redirect support for nft. The syntax is: % nft add rule nat prerouting redirect [port] [nat_flags] Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add masquerade supportArturo Borrero2014-10-091-0/+9
| | | | | | | | | | | | | | | | | This patch adds masquerade support for nft. The syntax is: % nft add rule nat postrouting masquerade [flags] Currently, flags are: random, random-fully, persistent Example: % nft add rule nat postrouting masquerade random,persistent Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add nat persistent and random optionsArturo Borrero2014-10-091-0/+1
| | | | | | | | | | | | | | | | | This patch adds more configuration options to the nat expression. The syntax is as follow: % nft add rule nat postrouting <snat|dnat> <nat_arguments> [flags] Flags are: random, persistent, random-fully. Example: % nft add rule nat postrouting dnat 1.1.1.1 random,persistent A requirement is to cache some [recent] copies of kernel headers. Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* nft: complete reject supportAlvaro Neira2014-10-091-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch allows to use the reject action in rules. For example: nft add rule filter input udp dport 22 reject In this rule, we assume that the reason is network unreachable. Also we can specify the reason with the option "with" and the reason. For example: nft add rule filter input tcp dport 22 reject with icmp type host-unreachable In the bridge tables and inet tables, we can use this action too. For example: nft add rule inet filter input reject with icmp type host-unreachable In this rule above, this generates a meta nfproto dependency to match ipv4 traffic because we use a icmpv4 reason to reject. If the reason is not specified, we infer it from the context. Moreover, we have the new icmpx datatype. You can use this datatype for the bridge and the inet tables to simplify your ruleset. For example: nft add rule inet filter input reject with icmpx type host-unreachable We have four icmpx reason and the mapping is: ICMPX reason | ICMPv6 | ICMPv4 | | admin-prohibited | admin-prohibited | admin-prohibited port-unreachable | port-unreachable | port-unreachable no-route | no-route | net-unreachable host-unreachable | addr-unreachable | host-unreachable Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: Enhance payload_gen_dependency()Alvaro Neira2014-10-091-0/+1
| | | | | | | | | | With this patch, this function returns a statement with the new dependency that we want to add, instead of an expression. This change is needed in a follow up patch. Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* queue: clean up queue statementPatrick McHardy2014-09-241-2/+1
| | | | | | | | | | | | | | | | | | - Rename keyword tokens to their actual keyword - Change the grammar to follow the standard schema for statements and arguments - Use actual expression for the queue numbers to support using normal range expressions, symbolic expression and so on. - restore comma seperation of flag keywords The result is that its possible to use standard ranges, prefix expressions, symbolic expressions etc for the queue number. We get checks for overflow, negative ranges and so on automatically. The comma seperation of flags is more similar to what we have for other flag values. It is still possible to use spaces, however this could be removed since we never had a release supporting that. Signed-off-by: Patrick McHardy <kaber@trash.net>
* src: add level option to the log statementPablo Neira Ayuso2014-07-251-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch is required if you use upcoming Linux kernels >= 3.17 which come with a complete logging support for nf_tables. If you use 'log' without options, the kernel logging buffer is used: nft> add rule filter input log You can also specify the logging prefix string: nft> add rule filter input log prefix "input: " You may want to specify the log level: nft> add rule filter input log prefix "input: " level notice By default, if not specified, the default level is 'warn' (just like in iptables). If you specify the group, then nft uses the nfnetlink_log instead: nft> add rule filter input log prefix "input: " group 10 You can also specify the snaplen and qthreshold for the nfnetlink_log. But you cannot mix level and group at the same time, they are mutually exclusive. Default values for both snaplen and qthreshold are 0 (just like in iptables). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: revert broken reject icmp code supportPablo Neira Ayuso2014-06-201-1/+0
| | | | | | | | | | | | | | | | | This patch reverts Alvaro's 34040b1 ("reject: add ICMP code parameter for indicating the type of error") and 11b2bb2 ("reject: Use protocol context for indicating the reject type"). These patches are flawed by two things: 1) IPv6 support is broken, only ICMP codes are considered. 2) If you don't specify any transport context, the utility exits without adding the rule, eg. nft add rule ip filter input reject. The kernel is also flawed when it comes to the inet table. Let's revert this until we can provide decent reject reason support. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* reject: add ICMP code parameter for indicating the type of errorÁlvaro Neira Ayuso2014-06-161-0/+1
| | | | | | | | | | | | | | | | | | | | This patch allows to indicate the ICMP code field in case that we use to reject. Before, we have always sent network unreachable error as ICMP code, now we can explicitly indicate the ICMP code that we want to use. Examples: nft add rule filter input tcp dport 22 reject with host-unreach nft add rule filter input udp dport 22 reject with host-unreach In this case, it will use the host unreachable code to reject traffic. The default code field still is network unreachable and we can also use the rules without the with like that: nft add rule filter input udp dport 22 reject Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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