summaryrefslogtreecommitdiffstats
path: root/src/rt.c
Commit message (Collapse)AuthorAgeFilesLines
* src: remove global symbol_tablePablo Neira Ayuso2019-08-081-7/+6
| | | | | | | | | Store symbol tables in context object instead. Use the nft_ctx object to store the dynamic symbol table. Pass it on to the parse_ctx object so this can be accessed from the parse routines. This dynamic symbol table is also accesible from the output_ctx object for print routines. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add parse_ctx objectPablo Neira Ayuso2019-08-081-2/+3
| | | | | | | | This object stores the dynamic symbol tables that are loaded from files. Pass this object to datatype parse functions, although this new parameter is not used yet, this is just a preparation patch. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add reference counter for dynamic datatypesPablo Neira Ayuso2019-06-131-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are two datatypes are using runtime datatype allocation: * Concatenations. * Integer, that require byteorder adjustment. From the evaluation / postprocess step, transformations are common, hence expressions may end up fetching (infering) datatypes from an existing one. This patch adds a reference counter to release the dynamic datatype object when it is shared. The API includes the following helper functions: * datatype_set(expr, datatype), to assign a datatype to an expression. This helper already deals with reference counting for dynamic datatypes. This also drops the reference counter of any previous datatype (to deal with the datatype replacement case). * datatype_get(datatype) bumps the reference counter. This function also deals with nul-pointers, that occurs when the datatype is unset. * datatype_free() drops the reference counter, and it also releases the datatype if there are not more clients of it. Rule of thumb is: The reference counter of any newly allocated datatype is set to zero. This patch also updates every spot to use datatype_set() for non-dynamic datatypes, for consistency. In this case, the helper just makes an simple assignment. Note that expr_alloc() has been updated to call datatype_get() on the datatype that is assigned to this new expression. Moreover, expr_free() calls datatype_free(). This fixes valgrind reports like this one: ==28352== 1,350 (440 direct, 910 indirect) bytes in 5 blocks are definitely lost in loss recor 3 of 3 ==28352== at 0x4C2BBAF: malloc (vg_replace_malloc.c:299) ==28352== by 0x4E79558: xmalloc (utils.c:36) ==28352== by 0x4E7963D: xzalloc (utils.c:65) ==28352== by 0x4E6029B: dtype_alloc (datatype.c:1073) ==28352== by 0x4E6029B: concat_type_alloc (datatype.c:1127) ==28352== by 0x4E6D3B3: netlink_delinearize_set (netlink.c:578) ==28352== by 0x4E6D68E: list_set_cb (netlink.c:648) ==28352== by 0x5D74023: nftnl_set_list_foreach (set.c:780) ==28352== by 0x4E6D6F3: netlink_list_sets (netlink.c:669) ==28352== by 0x4E5A7A3: cache_init_objects (rule.c:159) ==28352== by 0x4E5A7A3: cache_init (rule.c:216) ==28352== by 0x4E5A7A3: cache_update (rule.c:266) ==28352== by 0x4E7E0EE: nft_evaluate (libnftables.c:388) ==28352== by 0x4E7EADD: nft_run_cmd_from_filename (libnftables.c:479) ==28352== by 0x109A53: main (main.c:310) This patch also removes the DTYPE_F_CLONE flag which is broken and not needed anymore since proper reference counting is in place. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: expr: remove expr_ops from struct exprFlorian Westphal2019-02-081-3/+3
| | | | | | | | size of struct expr changes from 144 to 128 bytes on x86_64. This doesn't look like much, but large rulesets can have tens of thousands of expressions (each set element is represented by an expression). Signed-off-by: Florian Westphal <fw@strlen.de>
* src: rt: add support to check if route will perform ipsec transformationFlorian Westphal2018-09-211-0/+5
| | | | | Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* libnftables: Implement JSON output supportPhil Sutter2018-05-111-0/+2
| | | | | | | | | | | | 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: Make some arrays globally accessiblePhil Sutter2018-05-111-1/+1
| | | | | | | | | | | | | | | 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>
* src: rt: add keyword distinction for nexthop vs nexthop6Florian Westphal2017-09-291-1/+14
| | | | | | | | | | | | | | | | | | | | | the rt expression currently always sets NFT_RT_NEXTHOP4 and then uses the network base to determine if its really supposed to be NEXTHOP6. For inet, this will fail because the network base is not known, so this currently enforces need for "meta nfproto" to dermine the type. Allow following syntax instead: rt ip nexthop rt ip6 nexthop There is no need for a dependency anymore, as rt expression checks the hook protocol, ie. NEXTHOP4 will break if the hook pf is not NFPROTO_IPV4. Cc: Anders K. Pedersen <akp@cohaesio.com> Signed-off-by: Florian Westphal <fw@strlen.de>
* src: get rid of printfPhil Sutter2017-09-291-1/+1
| | | | | | | | | | | | | | | | | This patch introduces nft_print()/nft_gmp_print() functions which have to be used instead of printf to output information that were previously send to stdout. These functions print to a FILE pointer defined in struct output_ctx. It is set by calling: | old_fp = nft_ctx_set_output(ctx, new_fp); Having an application-defined FILE pointer is actually quite flexible: Using fmemopen() or even fopencookie(), an application gains full control over what is printed and where it should go to. Signed-off-by: Eric Leblond <eric@regit.org> Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* rt: add path mtu supportFlorian Westphal2017-08-221-0/+5
| | | | | | | | | | Only use case is to allow similar behaviour to iptables TCPMSS --clamp-mss-to-pmtu, by combining this with exthdr statement: tcp option maxseg size set rt mtu Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: Remove __init and __exit macro definitions.Varsha Rao2017-07-171-2/+2
| | | | | | | | | | | | Add nft_init and nft_exit functions, which calls _init and _exit functions in main.c file. Remove __init and __exit macro definitions as libnftables library will be created soon. Rename realm_table_init() and realm_table_exit() functions to avoid ambiguity as realm_table_rt_init(), realm_table_meta_init, realm_table_rt_exit() and realm_table_meta_exit() in rt.c and meta.c files. Signed-off-by: Varsha Rao <rvarsha016@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* include: Remove datatype_register().Varsha Rao2017-06-301-6/+1
| | | | | | | | Remove datatype_register() function and its calling __init functions. Add arguments of datatype_register() function to datatype array. 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 Rao2017-06-181-3/+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>
* rt: introduce routing expressionAnders K. Pedersen2016-10-281-0/+141
Introduce rt expression for routing related data with support for nexthop (i.e. 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 \ flow table acct { rt nexthop timeout 600s counter } # nft add rule ip6 filter postrouting \ flow table acct { rt nexthop timeout 600s counter } These rules count outgoing traffic per nexthop. Note that the timeout releases an entry if no traffic is seen for this nexthop within 10 minutes. # nft add rule inet filter postrouting \ ether type ip \ flow table acct { rt nexthop timeout 600s counter } # nft add rule inet filter postrouting \ ether type ip6 \ flow table acct { rt nexthop timeout 600s counter } Same as above, but via the inet family, where the ether type must be specified explicitly. "rt classid" is also implemented identical to "meta rtclassid", since it is more logical to have this match in the routing expression going forward. Signed-off-by: Anders K. Pedersen <akp@cohaesio.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>