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* setelem: add support for attaching comments to set elementsPatrick McHardy2015-04-123-0/+18
| | | | | | | | Syntax: # nft add element filter test { 192.168.0.1 comment "some host" } Signed-off-by: Patrick McHardy <kaber@trash.net>
* setelem: add timeout support for set elementsPatrick McHardy2015-04-123-0/+29
| | | | | | | | | | | | | | | | | | | | | | Support specifying per element timeout values and displaying the expiration time. If an element should not use the default timeout value of the set, an element specific value can be specified as follows: # nft add element filter test { 192.168.0.1, 192.168.0.2 timeout 10m} For listing of elements that use the default timeout value, just the expiration time is shown, otherwise the element specific timeout value is also displayed: set test { type ipv4_addr timeout 1h elements = { 192.168.0.2 timeout 10m expires 9m59s, 192.168.0.1 expires 59m59s} } Signed-off-by: Patrick McHardy <kaber@trash.net>
* set: add timeout support for setsPatrick McHardy2015-04-125-1/+51
| | | | | | | | | | | | | | | | | | | | | | | | Timeout support can be enabled in one of two ways: 1. Using a default timeout value: set test { type ipv4_addr; timeout 1h; } 2. Using the timeout flag without a default: set test { type ipv4_addr; flags timeout; } Optionally a garbage collection interval can be specified using gc-interval <interval>; Signed-off-by: Patrick McHardy <kaber@trash.net>
* expr: add set_elem_expr as container for set element attributesPatrick McHardy2015-04-127-30/+101
| | | | | | | | | | | | | | | | | | | | | | | | Add a new expression type "set_elem_expr" that is used as container for the key in order to attach different attributes, such as timeout values, to the key. The expression hierarchy is as follows: Sets: elem | key Maps: mapping / \ elem data | key Signed-off-by: Patrick McHardy <kaber@trash.net>
* parser: fix inconsistencies in set expression rulesPatrick McHardy2015-04-121-13/+18
| | | | | | | | | | | | | | | | | | | | | | | | Set keys are currently defined as a regular expr for pure sets and map_lhs_expr for maps. map_lhs_expr is what can actually be used for a single member, namely a concat_expr or a multiton_expr. The reason why pure sets use expr for the key is to allow recursive set specifications, which doesn't make sense for maps since every element needs a mapping. However, the rule is too wide and also allows map expressions as a key, which obviously doesn't make sense. Rearrange the rules so we have: set_lhs_expr: concat or multiton set_rhs_expr: concat or verdict and special case the recursive set specifications, as they deserve. Besides making it a lot easier to understand what is actually supported, this will be used by the following patch to support timeouts and comments for keys in a uniform way. Signed-off-by: Patrick McHardy <kaber@trash.net>
* parser: add a time_spec rulePatrick McHardy2015-04-121-0/+16
| | | | Signed-off-by: Patrick McHardy <kaber@trash.net>
* datatype: seperate time parsing/printing from time_typePatrick McHardy2015-04-121-25/+41
| | | | | | | Seperate relative time parsing and printing from the time_type to make it usable for set and set element time related parameters. Signed-off-by: Patrick McHardy <kaber@trash.net>
* datatype: less strict time parsingPatrick McHardy2015-04-121-12/+0
| | | | | | | | Don't require hours to be in range 0-23 and minutes/seconds in range 0-59. The time_type is used for relative times where it is entirely reasonable to specify 180s instead of 3m. Signed-off-by: Patrick McHardy <kaber@trash.net>
* datatype: fix parsing of time typePatrick McHardy2015-04-122-4/+7
| | | | | | Properly detect time strings in the lexer without quotation marks. Signed-off-by: Patrick McHardy <kaber@trash.net>
* src: restore interface to index cachePablo Neira Ayuso2015-04-115-3/+156
| | | | | | | | | | | | | | | | nftables used to have a cache to speed up interface name <-> index lookup, restore it using libmnl. This reduces netlink traffic since if_nametoindex() and if_indextoname() open, send a request, receive the list of interface and close a netlink socket for each call. I think this is also good for consistency since nft -f will operate with the same index number when reloading the ruleset. The cache is populated by when nft_if_nametoindex() and nft_if_indextoname() are used for first time. Then, it it released in the output path. In the interactive mode, it is invalidated after each command. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: introduce netlink_init_error()Pablo Neira Ayuso2015-04-091-4/+5
| | | | | | | | Based on the existing netlink_open_error(), but indicate file and line where the error happens. This will help us to diagnose what is going wrong when users can back to us to report problems. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* monitor: fix missing space after chain nameArturo Borrero2015-04-081-1/+1
| | | | | | | | | | | | | | | | Due to change f3ff9e9 ("rule: delete extra space in rule indentation") in function rule_print(), a missing space happens in monitor. before this patch: % nft monitor add rule ip test-table test-chainip protocol tcp after this patch: % nft monitor add rule ip test-table test-chain ip protocol tcp Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* parser: remove duplicated grammar for chain policyPatrick McHardy2015-03-251-12/+7
| | | | Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink_delinarize: fix payload dependency killing of link layer dependenciesPatrick McHardy2015-03-251-2/+2
| | | | | | | | | | | | | | | | | | | | | payload_dependency_kill() does not properly handle dependencies for link layer expressions. Since those dependencies are logically defined on an even lower layer (device layer), we don't have a payload base for them, meaning they will use PROTO_BASE_INVALID, which is skipped. So instead of storing the payload base on which the dependency is defined, we store the base of the layer for which the dependency applies, meaning dependencies defined by the device layer will properly work. This fixes killing the dependency of ether saddr, instead of iiftype ether ether ether saddr ... we now only display ether saddr ... Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink: fix use after free in netlink_get_table()Patrick McHardy2015-03-251-4/+4
| | | | Signed-off-by: Patrick McHardy <kaber@trash.net>
* set_elem: convert flag value to inclusive-OR binops during delinearizePatrick McHardy2015-03-231-0/+4
| | | | | | | | | | | | | | When a set contains combined flag values, they are displayed as numeric value since they don't match any of the single flag values: tcp flags { 18, psh, syn} Convert to a series of inclusive-OR binops of the single flag values for improved readability: tcp flags { syn | ack, psh, syn} Signed-off-by: Patrick McHardy <kaber@trash.net>
* rule: fix chain details align indentationsArturo Borrero2015-03-191-1/+1
| | | | | | | | | | f.i: type filter hook output priority 0; policy accept; ip daddr @test counter packets 14 bytes 1176 Reported-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netlink: fix crash when adding new non-base chainPablo Neira Ayuso2015-03-181-20/+24
| | | | | | | Fix crash when adding a non-base chain introduced by acdfae9 ("src: allow to specify the default policy for base chains"). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* rule: delete extra space in rule indentationArturo Borrero2015-03-181-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | Annoying extra space in rule indentation: Example before this patch: table ip6 test_table { chain test_chain { counter tcp dport { 22, 80, 443} accept # handle 1 ^ } } Example after this patch: table ip6 test_table { chain test_chain { counter tcp dport { 22, 80, 443} accept # handle 1 } } Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* evaluate: missing break; in str2hooknum()Pablo Neira Ayuso2015-03-171-0/+2
| | | | Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: allow to specify the default policy for base chainsPablo Neira Ayuso2015-03-173-5/+52
| | | | | | | | | | | | | | | | | | The new syntax is: nft add chain filter input { hook input type filter priority 0\; policy accept\; } but the previous syntax is still allowed: nft add chain filter input { hook input type filter priority 0\; } this assumes default policy to accept. If the base chain already exists, you can update the policy via: nft add chain filter input { policy drop\; } Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: expose table flagsPablo Neira Ayuso2015-03-174-4/+62
| | | | | | | | | | | | | | | | | | | The nf_tables kernel API provides a way to disable a table using the dormant flag. This patch adds the missing code to expose this feature through nft. Basically, if you want to disable a table and all its chains from seen any traffic, you have to type: nft add table filter { flags dormant\; } to re-enable the table, you have to: nft add table filter this clears the flags. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* main: display errors through stderrPablo Neira Ayuso2015-03-021-1/+1
| | | | | Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1000 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* rule: fix object order via nft -fPablo Neira Ayuso2015-02-181-2/+7
| | | | | | | | | | | | | | | | | | The objects need to be loaded in the following order: #1 tables #2 chains #3 sets #4 rules We have to make sure that chains are in place by when we add rules with jumps/gotos. Similarly, we have to make sure that the sets are in place by when rules reference them. Without this patch, you may hit ENOENT errors depending on your ruleset configuration. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* meta: register pkttype_type datatypePablo Neira Ayuso2015-02-011-0/+1
| | | | | Closes: http://bugzilla.netfilter.org/show_bug.cgi?id=995 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* evaluate: use stmt_evaluate_arg() in all casesPatrick McHardy2015-01-121-4/+3
| | | | | | | | | When using a symbolic vmap expression, we fail to verify that the map actually contains verdicts. Use stmt_evaluate_arg() everywhere to fix this. Signed-off-by: Patrick McHardy <kaber@trash.net>
* evaluate: check that map expressions' datatype matches mappingsPatrick McHardy2015-01-121-0/+7
| | | | | | | | | | | | Catch type errors in map expressions using named maps: # nft add map filter test { type ipv4_addr : inet_service; } # nft filter output mark set tcp dport map @test <cmdline>:1:38-42: Error: datatype mismatch, map expects IPv4 address, mapping expression has type internet network service filter output mark set tcp dport map @test ~~~~~~~~~ ^^^^^ Signed-off-by: Patrick McHardy <kaber@trash.net>
* evaluate: properly set datatype of map expressionPatrick McHardy2015-01-121-1/+1
| | | | | | | | | | | | | | | | | | | | | The datatype of the map expression is the datatype of the mappings. # nft add map filter test { type ipv4_addr : inet_service; } # nft filter output mark set ip daddr map @test Before: <cmdline>:1:24-41: Error: datatype mismatch: expected packet mark, expression has type IPv4 address filter output mark set ip daddr map @test ~~~~~~~~~^^^^^^^^^^^^^^^^^^ After: <cmdline>:1:24-41: Error: datatype mismatch: expected packet mark, expression has type internet network service filter output mark set ip daddr map @test ~~~~~~~~~^^^^^^^^^^^^^^^^^^ Signed-off-by: Patrick McHardy <kaber@trash.net>
* evaluate: verify named map is actually a mapPatrick McHardy2015-01-121-1/+2
| | | | | | | | | | | | | | | | | | | # nft add set filter test { type ipv4_addr; } # nft filter input ip daddr vmap @test Before: <cmdline>:0:0-32: Error: Could not process rule: Invalid argument filter input ip daddr vmap @test ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ After: <cmdline>:1:28-32: Error: Expression is not a map filter input ip daddr vmap @test ^^^^^ Signed-off-by: Patrick McHardy <kaber@trash.net>
* meta: don't print meta keyword for unqualified meta stmtsPatrick McHardy2015-01-121-7/+17
| | | | Signed-off-by: Patrick McHardy <kaber@trash.net>
* evaluate: clean up unused variables (pctx)Alvaro Neira Ayuso2015-01-121-3/+0
| | | | | Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* expr: fix crash when listing non-verdict mappingsPatrick McHardy2015-01-121-0/+6
| | | | | | | | | | | | | | | | Fix regression introduced by commit 87c2a2205: netlink_delinearize: clone on netlink_get_register(), release previous on _set() When using a non-verdict mapping, the set ref expression is assigned to the destination register. The next get_register() will attempt to clone it and crash because of the missing ->clone() callback. # nft filter input meta mark set ip daddr map { 192.168.0.1 : 123 } # nft list table filter Segmentation fault (core dumped) Signed-off-by: Patrick McHardy <kaber@trash.net>
* set: remove unused set_clone() functionPatrick McHardy2015-01-121-18/+0
| | | | | | | | The set_clone() function was added by the event monitor patchset and is unused. It is also broken since it simply initializes the list head to the list of the original set, so remove it. Signed-off-by: Patrick McHardy <kaber@trash.net>
* parser: properly fix handling of large integer valuesPatrick McHardy2015-01-112-16/+3
| | | | | | | | | | | | | | | Introduction of the ERROR symbol is an ugly hack. There's no reason to special case large integer values, the NUM token only exists for small values that are needed immediately, everything else is passed as EXPR_SYMBOL to evaluation anyways. Additionally the error reporting is different from what we'd usually report, the token is easy to confuse with the bison internal error token and it even has a name, messing up bison internal diagnostics. Simply return values to large to be handled by strtoull as STRING. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink_linearize: add register dumping helper functionPatrick McHardy2015-01-111-34/+40
| | | | | | | Add a helper function to dump netlink register numbers in preparation of concat support. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink_delinearize: add register parsing helper functionPatrick McHardy2015-01-111-20/+26
| | | | | | | Add a helper function to parse netlink register numbers in preparation of concat support. Signed-off-by: Patrick McHardy <kaber@trash.net>
* concat: add concat subtype lookup/id helpersPatrick McHardy2015-01-113-10/+6
| | | | Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink_delinearize: cleanup hard to read codePatrick McHardy2015-01-111-60/+79
| | | | | | | | | | | The netlink parsing code is full of long function calls spawning multiple lines and in some cases parses netlink attributes multiple times. Use local variables for the registers and other data required to reconstruct the expressions and statements and reorder the code in some cases to move related processing next to each other. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink_delinearize: rename netlink_parse_*_sreg/dreg functionsPatrick McHardy2015-01-111-8/+8
| | | | | | These are really badly chosen names, use parse_expr and parse_stmt instead. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink: readability fixesPatrick McHardy2015-01-111-56/+71
| | | | | | | | | Improve readability by using local variables for netlink attributes, ordering variables more logically, don't arbitrarily initialize some variables in the definition section and in the body and generally make similar functions look similar. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink: style fixesPatrick McHardy2015-01-111-24/+15
| | | | | | | | | Remove style discrepancies between different netlink I/O functions: - we don't use brackets for single line statements - most functions don't have a newline between error reporting and exit Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink: style fixesPatrick McHardy2015-01-111-12/+18
| | | | | | We include an empty line between variable definitions and code. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink: remove unnecessary temporary variablePatrick McHardy2015-01-111-54/+18
| | | | | | | Waste less space and return the results of the batch/compat functions directly. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink: fix memory leaksPatrick McHardy2015-01-112-1/+6
| | | | | | | Fix two memory leaks in netlink event monitor. Also fix a leak related to all sets, the ->init expression is not freed. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netlink_delinearize: fix error handling for invalid registersPatrick McHardy2015-01-101-1/+4
| | | | | | | | | | | netlink_delinearize is prepared to deal with malformed expressions from the kernel that it doesn't understand. However since expressions are now cloned unconditionally by netlink_get_register(), we crash before such errors can be detected for invalid inputs. Fix by only cloning non-NULL expressions. Signed-off-by: Patrick McHardy <kaber@trash.net>
* evaluate: add missing datatype compat checks for statement argumentsPatrick McHardy2015-01-101-23/+43
| | | | | | | | | | | | | | Add a helper function to evaluate expressions used as arguments for statements and report datatype mismatches. Fixes acceptance of mismatching expressions like: $ nft filter output meta mark set ip daddr <cmdline>:1:29-36: Error: datatype mismatch: expected packet mark. expression has type IPv4 address filter output meta mark set ip daddr ~~~~~~~~~~~~~~^^^^^^^^ Signed-off-by: Patrick McHardy <kaber@trash.net>
* eval: refactor NAT evaluation functionsPatrick McHardy2015-01-101-56/+54
| | | | | | | | | | The redir and masq evaluation functions include some useless context updates and checks. Refactor the NAT code to have a single instance of address and transport evaluation functions for simplicity and unified error reporting. Signed-off-by: Patrick McHardy <kaber@trash.net>
* src: modify pr_debug() to use printf and introduce to pr_gmp_debug()Pablo Neira Ayuso2015-01-081-11/+11
| | | | | | | | | | | | | Modify pr_debug() to use printf so we get debugging traces for proto-ctx when --with-mini-gmp is enabled. Add pr_gmp_debug(), this is disabled with --with-mini-gmp since it relies on the gmp_printf(), which is not available in the mini-gmp implementation. Suggested by Patrick. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* build: use -Wno-sign-compare to avoid compilation warning in mini-gmp.cPablo Neira Ayuso2015-01-081-0/+2
| | | | | | | | | | | | | | | | CC mini-gmp.o mini-gmp.c: In function ‘mpn_get_str_bits’: mini-gmp.c:1176:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] mini-gmp.c: In function ‘mpz_and’: mini-gmp.c:3650:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] mini-gmp.c: In function ‘mpz_ior’: mini-gmp.c:3723:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] mini-gmp.c: In function ‘mpz_xor’: mini-gmp.c:3792:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] mini-gmp.c: In function ‘mpz_set_str’: mini-gmp.c:4167:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* build: add --with-mini-gmp switch to disable linking libgmpSteven Barth2015-01-083-2/+4446
| | | | | | | | | | This allows to disable linking the >400 KB big libgmp and replace it with the builtin mini-gmp which only increases size by ~30KB. Enabling this selectively decreases debugging verbosity (pr_debug). Signed-off-by: Steven Barth <cyrus@openwrt.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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