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* tests: Add test cases for nested anonymous setsPhil Sutter2017-03-224-0/+57
| | | | | | | | | This makes sure nesting of anonymous sets works regardless of whether defines are used or not. As a side-effect, it also checks that overlap checking when IP address prefixes are used, works. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* proto: Add some exotic ICMPv6 typesPhil Sutter2017-03-202-3/+39
| | | | | | | | | | | | | | | This adds support for matching on inverse ND messages as defined by RFC3122 (not implemented in Linux) and MLDv2 as defined by RFC3810. Note that ICMPV6_MLD2_REPORT macro is defined in linux/icmpv6.h but including that header leads to conflicts with symbols defined in netinet/icmp6.h. In addition to the above, "mld-listener-done" is introduced as an alias for "mld-listener-reduction". Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: add insert-failure testFlorian Westphal2017-03-162-3/+15
| | | | | | | It should not be possible to add a ip6 restricted helper to ip family. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: add ct helper testsFlorian Westphal2017-03-163-1/+28
| | | | | | | needs minor tweak to nft-test.py so we don't zap the ';' withhin the {}. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: Adjust for changed exthdr debug outputPhil Sutter2017-03-132-14/+14
| | | | | | | | Debug output from libnftnl has changed to include 'present' keyword if NFT_EXTHDR_F_PRESENT flag is set in expression. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* fib: Support existence checkPhil Sutter2017-03-132-0/+13
| | | | | | | | | | | | | | | | | This allows to check whether a FIB entry exists for a given packet by comparing the expression with a boolean keyword like so: | fib daddr oif exists The implementation requires introduction of a generic expression flag EXPR_F_BOOLEAN which allows relational expression to signal it's LHS that a boolean comparison is being done (indicated by boolean type on RHS). In contrast to exthdr existence checks, fib expression can't know this in beforehand because the LHS syntax is absolutely identical to a non-boolean comparison. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* exthdr: Implement existence checkPhil Sutter2017-03-104-0/+96
| | | | | | | | | | | This allows to check for existence of an IPv6 extension or TCP option header by using the following syntax: | exthdr frag exists | tcpopt window exists Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: hash: support of symmetric hashLaura Garcia Liebana2017-03-062-0/+5
| | | | | | | | | | | | | | | | | | | | | This patch provides symmetric hash support according to source ip address and port, and destination ip address and port. The new attribute NFTA_HASH_TYPE has been included to support different types of hashing functions. Currently supported NFT_HASH_JENKINS through jhash and NFT_HASH_SYM through symhash. The main difference between both types are: - jhash requires an expression with sreg, symhash doesn't. - symhash supports modulus and offset, but not seed. Examples: nft add rule ip nat prerouting ct mark set jhash ip saddr mod 2 nft add rule ip nat prerouting ct mark set symhash mod 2 Signed-off-by: Laura Garcia Liebana <laura.garcia@zevenet.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: fix some typos in READMETimothy Redaelli2017-03-021-3/+3
| | | | | | | Python script name ends by .py instead of .sh Signed-off-by: Timothy Redaelli <tredaelli@redhat.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: revisit tcp options supportPablo Neira Ayuso2017-02-286-61/+60
| | | | | | | | | | | | | | | | | | | Rework syntax, add tokens so we can extend the grammar more easily. This has triggered several syntax changes with regards to the original patch, specifically: tcp option sack0 left 1 There is no space between sack and the block number anymore, no more offset field, now they are a single field. Just like we do with rt, rt0 and rt2. This simplifies our grammar and that is good since it makes our life easier when extending it later on to accomodate new features. I have also renamed sack_permitted to sack-permitted. I couldn't find any option using underscore so far, so let's keep it consistent with what we have. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: add test entries for conntrack zonesFlorian Westphal2017-02-282-0/+57
| | | | | Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: fix incorrect bytecode in numgen and hash mappingsPablo Neira Ayuso2017-02-252-2/+2
| | | | | | | Byteorder is not correct as it is expressed in network byteorder. This uncovered when storing set byteorder in NFTA_USER_DATA. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: Add basic tests for ip, ip6 and inetManuel Messner2017-02-126-0/+656
| | | | | Signed-off-by: Manuel Messner <mm@skelett.io> Signed-off-by: Florian Westphal <fw@strlen.de>
* statement: fix print of ip dnat addressFlorian Westphal2017-02-052-0/+13
| | | | | | | | | | | | the change causes non-ipv6 addresses to not be printed at all in case a nfproto was given. Also add a test case to catch this. Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1117 Fixes: 5ab0e10fc6e2c22363a ("src: support for RFC2732 IPv6 address format with brackets") Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: Add tests for stateful objectsElise Lennion2017-01-273-0/+59
| | | | | | | | These test for adding counters and quotas, to tables of different families, and for referencing the objects in rules. Signed-off-by: Elise Lennion <elise.lennion@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: Add suport for stateful objects in python testsElise Lennion2017-01-271-0/+131
| | | | | | | | | | | | | | This allows to write pytests using the new stateful objects. To add an object use the symbol '%', followed by the name, type and specifications (currently used in quota): %cnt1 type counter;ok # Adds the counter cnt1 to all tables %qt1 type quota over 25 mbytes;ok # Adds the quota qt1 to all tables Signed-off-by: Elise Lennion <elise.lennion@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* payload: explicit network ctx assignment for icmp/icmp6 in special familiesArturo Borrero Gonzalez2017-01-276-0/+132
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In the inet, bridge and netdev families, we can add rules like these: % nft add rule inet t c ip protocol icmp icmp type echo-request % nft add rule inet t c ip6 nexthdr icmpv6 icmpv6 type echo-request However, when we print the ruleset: % nft list ruleset table inet t { chain c { icmpv6 type echo-request icmp type echo-request } } These rules we obtain can't be added again: % nft add rule inet t c icmp type echo-request <cmdline>:1:19-27: Error: conflicting protocols specified: inet-service vs. icmp add rule inet t c icmp type echo-request ^^^^^^^^^ % nft add rule inet t c icmpv6 type echo-request <cmdline>:1:19-29: Error: conflicting protocols specified: inet-service vs. icmpv6 add rule inet t c icmpv6 type echo-request ^^^^^^^^^^^ Since I wouldn't expect an IP packet carrying ICMPv6, or IPv6 packet carrying ICMP, if the link layer is inet, the network layer protocol context can be safely update to 'ip' or 'ip6'. Moreover, nft currently generates a 'meta nfproto ipvX' depedency when using icmp or icmp6 in the inet family, and similar in netdev and bridge families. While at it, a bit of code factorization is introduced. Fixes: https://bugzilla.netfilter.org/show_bug.cgi?id=1073 Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: Use stateless option on testsElise Lennion2017-01-1812-15/+15
| | | | | | | | | | | To don't trigger false errors because of unrelated traffic on the tested machine. Tests, which have rules with counter and 'ok' result, are updated to avoid new Warnings. Signed-off-by: Elise Lennion <elise.lennion@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* ct: add average bytes per packet counter supportLiping Zhang2017-01-162-0/+15
| | | | | | | | | | | | | | | | | Similar to connbytes extension in iptables, now you can use it to match average bytes per packet a connection has transferred so far. For example, match avgpkt in "BOTH" diretion: # nft add rule x y ct avgpkt \> 100 Match avgpkt in reply direction: # nft add rule x y ct reply avgpkt \< 900 Or match avgpkt in original direction: # nft add rule x y ct original avgpkt \> 200 Signed-off-by: Liping Zhang <zlpnobody@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: update quota and payloadPablo Neira Ayuso2016-12-1411-61/+61
| | | | | | Include new consumed field for quota, and check for csum_flags in payload. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: don't send empty set elements netlink message to kernelPablo Neira Ayuso2016-12-142-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The following command: # nft --debug=mnl add rule x y flow table xyz { ip saddr timeout 30s counter } breaks with EINVAL. The following netlink message is causing the problem: ... ---------------- ------------------ | 0000000044 | | message length | | 02572 | R--- | | type | flags | | 0000000004 | | sequence number| | 0000000000 | | port ID | ---------------- ------------------ | 02 00 00 00 | | extra header | |00008|--|00002| |len |flags| type| | 78 79 7a 00 | | data | x y z |00008|--|00004| |len |flags| type| | 00 00 00 01 | | data | |00006|--|00001| |len |flags| type| | 78 00 00 00 | | data | x ---------------- ------------------ ... This is incorrect since this describes no elements at all, so it is useless. Add upfront check before iterating over the list of set elements so the netlink message is not placed in the batch. This patch also adds a set so flow tables are minimally covered. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: Test TCP flags match with parenthesesPhil Sutter2016-11-305-0/+33
| | | | | | | | This should test the fix in commit 7222680eb328b ("parser_bison: Allow parens on RHS of relational_expr"). Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
* tests/py: Unmask negative set lookupAnatole Denis2016-11-2985-226/+4690
| | | | | | | | Many testcases were masked because of bug #888. This series of patches unmasks them Signed-off-by: Anatole Denis <anatole@rezel.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add log flags syntax supportLiping Zhang2016-11-242-0/+21
| | | | | | | | | | | | | | | | | | | | | 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>
* Revert "tests: py: nft-tests.py: Add function for loading and removing ↵Florian Westphal2016-11-171-32/+0
| | | | | | | | | | | | | | | | | kernel modules" Its not needed at the moment, all tests that need a network interface (meta iif/oif) use the lo interface. For iifname/oifname the network device doesn't have to exist. We can revisit this in case we need it in the future. (seems commit causes issues on kernels built without dummy module). Reported-by: Arturo Borrero Gonzalez <arturo@debian.org> Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Manuel Messner <mm@skelett.io>
* src: add notrack supportPablo Neira Ayuso2016-11-142-0/+6
| | | | | | | This patch adds the notrack statement, to skip connection tracking for certain packets. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: missing range conversion in icmpv6Pablo Neira Ayuso2016-11-141-2/+1
| | | | | | Use range expression to negate ranges. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: add some testcases for log flagsPablo Neira Ayuso2016-11-143-17/+17
| | | | | | | Remove null and zero flags from tests, to reduce the noise when running tests. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add offset attribute for hash expressionLaura Garcia Liebana2016-11-092-0/+16
| | | | | | | | | | | Add support to add an offset to the hash generator, eg. ct mark set hash ip saddr mod 10 offset 100 This will generate marks with series between 100-109. Signed-off-by: Laura Garcia Liebana <nevola@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: make hash seed attribute optionalLaura Garcia Liebana2016-11-092-0/+8
| | | | | | | | | | | | | | | | | | The hash expression requires a seed attribute to call the jhash operation, eg. # nft add rule x y meta mark set jhash ip saddr . ip daddr mod 2 \ seed 0xdeadbeef With this patch the seed attribute is optional and it's generated by a random function from userspace, eg. # nft add rule x y meta mark set jhash ip saddr . ip daddr mod 2 The kernel will take care of generate a random seed. Signed-off-by: Laura Garcia Liebana <nevola@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netlink_linearize: skip set element expression in flow table keyPablo Neira Ayuso2016-10-312-0/+22
| | | | | | | | | | | | | | | | | | | | | Anders reports that: # nft add rule ip6 filter postrouting \ flow table acct_out \{ meta iif . ip6 saddr timeout 600s counter \} while the opposite doesn't work: # nft add rule ip6 filter postrouting \ flow table acct_out \{ ip6 saddr . meta iif timeout 600s counter \} netlink_gen_flow_stmt() relies on the flow table key, that is expressed as a set element. Use the set element key instead to skip the set element wrap, otherwise get_register() abort execution: nft: netlink_linearize.c:650: netlink_gen_expr: Assertion `dreg < ctx->reg_low' failed. Reported-by: Anders K. Pedersen <akp@cohaesio.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests/py: add missing payload test for numgen offsetPablo Neira Ayuso2016-10-311-0/+5
| | | | | | | | | | The new cover test for: ct mark set numgen inc mod 2 offset 100 was lacking the payload file chunk. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* Replace tests/files/expr-rt with Python based tests, and replace ether typeAnders K. Pedersen2016-10-298-0/+56
| | | | | | | with meta nfproto, which generates a bit fewer instructions. Signed-off-by: Anders K. Pedersen <akp@cohaesio.com> Signed-off-by: Florian Westphal <fw@strlen.de>
* src: add fib expressionFlorian Westphal2016-10-282-0/+36
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds the 'fib' expression which can be used to obtain the output interface from the route table based on either source or destination address of a packet. This can be used to e.g. add reverse path filtering: # drop if not coming from the same interface packet # arrived on # nft add rule x prerouting fib saddr . iif oif eq 0 drop # accept only if from eth0 # nft add rule x prerouting fib saddr . iif oif eq "eth0" accept # accept if from any valid interface # nft add rule x prerouting fib saddr oif accept Querying of address type is also supported. This can be used to e.g. only accept packets to addresses configured in the same interface: # fib daddr . iif type local Its also possible to use mark and verdict map, e.g.: # nft add rule x prerouting meta mark set 0xdead fib daddr . mark type vmap { blackhole : drop, prohibit : drop, unicast : accept } Signed-off-by: Florian Westphal <fw@strlen.de>
* ct: allow resolving ct keys at run timeFlorian Westphal2016-10-271-0/+5
| | | | | | | ... and remove those keywords we no longer need. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add offset attribute for numgen expressionLaura Garcia Liebana2016-10-271-0/+1
| | | | | | | | | | | | | Add support to add an offset to the numgen generated value. Example: ct mark set numgen inc mod 2 offset 100 This will generate marks with serie like 100, 101, 100, ... Signed-off-by: Laura Garcia Liebana <nevola@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* meta: fix pkttype name and add 'other' symbolFlorian Westphal2016-10-272-4/+4
| | | | | | | | | | | | | | 'unicast' doesn't check for unicast packets; it checks for PACKET_HOST, i.e. a packet coming in for this host. A unicast address to some other machine (e.g. because nic is in promisc mode) will have PACKET_OTHER. So at best this is misleading, so this patch changes it to 'host'. The unicast entry is retained for compat purpose. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: support ct l3proto/protocol without direction syntaxLiping Zhang2016-10-172-8/+8
| | | | | | | | | | | | | | | Acctually, ct l3proto and ct protocol are unrelated to direction, so it's unnecessary that we must specify dir if we want to use them. Now add support that we can match ct l3proto/protocol without direction: # nft add rule filter input ct l3proto ipv4 # nft add rule filter output ct protocol 17 Note: existing syntax is still preserved, so "ct reply l3proto ipv6" is still fine. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: use new range expression for != [a,b] intervalsPablo Neira Ayuso2016-10-1755-396/+198
| | | | | | | Use new range expression in the kernel to fix wrong bytecode generation. This patch also adjust tests so we don't hit problems there. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: fix numgen case failed due to changes in libnftnlLiping Zhang2016-09-231-3/+3
| | | | | | | | | | | | In nftnl_expr_ng_snprintf_default, format "(%u)" was changed to "mod %u", so numgen test case failed: ... '[ numgen reg 1 = inc(2) ]' mismatches '[ numgen reg 1 = inc mod 2 ]' ... ip/numgen.t: 3 unit tests, 3 error, 0 warning Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: add more test cases for queue exprLiping Zhang2016-09-232-6/+17
| | | | | | | | | | | It's necessary to cover more test cases, for example, large queue range 1-65535, error queue number 65536. Also add a space before tailing square brackets, this is updated to keep consistent with other expr. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: replace "eth0" with "lo" in dup expr testsLiping Zhang2016-09-124-12/+12
| | | | | | | | | | | | | | This patch follow up on Manuel's commit a8871ba6daa0 ("tests: py: any: Make tests more generic by using other interfaces"). The ifindex of "eth0" is not always 1, furthermore, "eth0" maybe not exist on some systems. So replace it with "lo" will make tests more rubost. In other test cases, "eth0" is used by iifname or oifname, so there's no need to convert it to "lo". Even if "eth0" is not exist, test will never fail. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Florian Westphal <fw@strlen.de>
* tests: catch ordering issue w. ether setFlorian Westphal2016-09-092-3/+3
| | | | | | | | | | | | | | | Before previous commit, ether set (payload statement) was reversed on output: ether daddr set 00:03:2d:2b:74:ec would be shown as 'ec:74:2b:2d:03:00'. With ff:ff:ff ... such bug doesn't appear so use something where it will show up. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* tests: py: any: Remove duplicate testsManuel Johannes Messner2016-09-062-15/+0
| | | | | | | This commit removes some duplicated tests. Signed-off-by: Manuel Johannes Messner <manuel.johannes.messner@hs-furtwangen.de> Signed-off-by: Florian Westphal <fw@strlen.de>
* tests: py: any: Make tests more generic by using other interfacesManuel Johannes Messner2016-09-062-71/+71
| | | | | | | | | | | Some tests use hard coded interface names and interface indexes. This commit removes these cases by exchanging "eth0" with "dummy0" and "lo" (depending on the test) in all ifname tests and by using "lo" instead of "eth0" in all interface index tests (because we can assume "lo" ifindex is 1). Signed-off-by: Manuel Johannes Messner <manuel.johannes.messner@hs-furtwangen.de> Signed-off-by: Florian Westphal <fw@strlen.de>
* tests: py: nft-tests.py: Add function for loading and removing kernel modulesManuel Johannes Messner2016-09-061-0/+32
| | | | | | | | Some tests use the dummy kernel module. This commit adds a function to automatically load that module and remove it afterwards. Signed-off-by: Manuel Johannes Messner <manuel.johannes.messner@hs-furtwangen.de> Signed-off-by: Florian Westphal <fw@strlen.de>
* tests: py: adapt netlink bytecode output of numgen and hashPablo Neira Ayuso2016-08-302-5/+5
| | | | | | Adapt them to the revisited output string now in libnftnl. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add hash expressionPablo Neira Ayuso2016-08-292-0/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This is special expression that transforms an input expression into a 32-bit unsigned integer. This expression takes a modulus parameter to scale the result and the random seed so the hash result becomes harder to predict. You can use it to set the packet mark, eg. # nft add rule x y meta mark set jhash ip saddr . ip daddr mod 2 seed 0xdeadbeef You can combine this with maps too, eg. # nft add rule x y dnat to jhash ip saddr mod 2 seed 0xdeadbeef map { \ 0 : 192.168.20.100, \ 1 : 192.168.30.100 \ } Currently, this expression implements the jenkins hash implementation available in the Linux kernel: http://lxr.free-electrons.com/source/include/linux/jhash.h But it should be possible to extend it to support any other hash function type. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add numgen expressionPablo Neira Ayuso2016-08-292-0/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This new expression allows us to generate incremental and random numbers bound to a specified modulus value. The following rule sets the conntrack mark of 0 to the first packet seen, then 1 to second packet, then 0 again to the third packet and so on: # nft add rule x y ct mark set numgen inc mod 2 A more useful example is a simple load balancing scenario, where you can also use maps to set the destination NAT address based on this new numgen expression: # nft add rule nat prerouting \ dnat to numgen inc mod 2 map { 0 : 192.168.10.100, 1 : 192.168.20.200 } So this is distributing new connections in a round-robin fashion between 192.168.10.100 and 192.168.20.200. Don't forget the special NAT chain semantics: Only the first packet evaluates the rule, follow up packets rely on conntrack to apply the NAT information. You can also emulate flow distribution with different backend weights using intervals: # nft add rule nat prerouting \ dnat to numgen inc mod 10 map { 0-5 : 192.168.10.100, 6-9 : 192.168.20.200 } So 192.168.10.100 gets 60% of the workload, while 192.168.20.200 gets 40%. We can also be mixed with dynamic sets, thus weight can be updated in runtime. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add quota statementPablo Neira Ayuso2016-08-292-0/+76
| | | | | | | | | | | | | 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>