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* src: Add command "replace" for rulesCarlos Falgueras García2015-11-021-0/+16
| | | | | | | | | | | | | | | | | | | | | | | | Modify the parser and add necessary functions to provide the command "nft replace rule <ruleid_spec> <new_rule>" Example of use: # nft list ruleset -a table ip filter { chain output { ip daddr 8.8.8.7 counter packets 0 bytes 0 # handle 3 } } # nft replace rule filter output handle 3 ip daddr 8.8.8.8 counter # nft list ruleset -a table ip filter { chain output { ip daddr 8.8.8.8 counter packets 0 bytes 0 # handle 3 } } Signed-off-by: Carlos Falgueras García <carlosfg@riseup.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: use new symbols in libnftnlPablo Neira Ayuso2015-09-161-202/+202
| | | | | | | | | Adapt the nftables code to use the new symbols in libnftnl. This patch contains quite some renaming to reserve the nft_ prefix for our high level library. Explicitly request libnftnl 1.0.5 at configure stage. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: rework netlink socket receive path for eventsPablo Neira Ayuso2015-09-071-1/+37
| | | | | | | | | | | | | This patch reworks two aspects of the netlink socket event receive path: 1) In case of ENOBUFS, stay in the loop to keep receiving messages. The tool displays a message so the user knows that we got lost event messages. 2) Rise the default size of the receive socket buffer up to 16 MBytes to reduce chances of hitting ENOBUFS. Asumming that the netlink event message size is ~150 bytes, we can bear with ~111848 rules without message loss. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: fix build with debug offFlorian Westphal2015-09-071-1/+1
| | | | | | mnl.c:241:1: error: expected identifier or '(' before '}' token Signed-off-by: Florian Westphal <fw@strlen.de>
* mnl: use new libnftnl batch APIPablo Neira Ayuso2015-04-141-91/+33
| | | | | | | | Each batch page has a size of 320 Kbytes, and the limit has been set to 256 KBytes, so the overrun area is 64 KBytes long to accomodate the largest netlink message (sets). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: expose table flagsPablo Neira Ayuso2015-03-171-0/+2
| | | | | | | | | | | | | | | | | | | 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>
* mnl: delete useless parameter nf_sock in batch functionsArturo Borrero2014-10-241-16/+16
| | | | | | | The 'struct mnl_socket *nf_sock' parameter is useless and perturbing. Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: use nft_batch_begin and nft_batch_end from libnftnlPablo Neira Ayuso2014-09-301-19/+6
| | | | | | Use the existing functions in libnftnl to begin and end a batch. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: consistency checks across several netlink dumpsPablo Neira Ayuso2014-09-191-0/+51
| | | | | | | | | | | | Obtain the generation ID before dumping the object lists. Then, check for generation ID updates when dumping the several lists that this needs. In case of interference, nft has to remove the stale objects and retry from scratch. This is complementary to the NLM_F_DUMP_INTR flag which is local to one single netlink dump. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: fix crashes when using sets with many elementsPablo Neira Ayuso2014-07-251-11/+32
| | | | | | | | | | | | | | | | | | | | | | nft crashes when adding many elements into a set for two reasons: 1) The overflow of the nla_len field for the NFTA_SET_ELEM_LIST_ELEMENTS attribute. 2) Out-of-bound memory writes to the reserved area for the netlink message, which is solved by the patch entitled ("mnl: introduce NFT_NLMSG_MAXSIZE"). This patch adds the corresponding nla_len overflow check for NFTA_SET_ELEM_LIST_ELEMENTS and it splits the elements in several netlink messages. This should be enough when set updates are handled by the transaction infrastructure. With this patch, nft should be now capable of adding an unlimited number of elements to a given set. Fixes: https://bugzilla.netfilter.org/show_bug.cgi?id=898 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: introduce NFT_NLMSG_MAXSIZEPablo Neira Ayuso2014-07-251-5/+13
| | | | | | | | | | | | | | | | | | | The NFT_NLMSG_MAXSIZE constant defines the maximum nf_tables netlink message. Currently, the largest is the set element message, which contains the NFTA_SET_ELEM_LIST_ELEMENTS attribute. This attribute is a nest that describes the set elements. Given that the netlink attribute length (nla_len) is 16 bits, the largest message is a bit larger than 64 KBytes. Thus, the proposed value of NFT_NLMSG_MAXSIZE is set to (1 << 16) + getpagesize(). This new constant is used to calculate the length of: 1) the batch page length, when the batching mode is used. 2) the buffer that stores the netlink message in the send (when no batching is used) and receive paths. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: rework batching logic to fix possible use of uninitialized pagesPablo Neira Ayuso2014-07-221-36/+46
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch reworks the batching logic in several aspects: 1) New batch pages are now always added into the batch page list in first place. Then, in the send path, if the last batch page is empty, it is removed from the batch list. 2) nft_batch_page_add() is only called if the current batch page is full. Therefore, it is guaranteed to find a valid netlink message in the batch page when moving the tail that didn't fit into a new batch page. 3) The batch paging is initialized and released from the nft_netlink() path. 4) No more global struct mnl_nlmsg_batch *batch that points to the current batch page. Instead, it is retrieved from the tail of the batch list, which indicates the current batch page. This patch fixes a crash due to access of uninitialized memory area in due to calling batch_page_add() with an empty batch in the send path, and the memleak of the batch page contents. Reported in: http://patchwork.ozlabs.org/patch/367085/ http://patchwork.ozlabs.org/patch/367774/ The patch is larger, but this saves the zeroing of the batch page area. Reported-by: Yanchuan Nian <ycnian@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: add nft_nlmsg_batch_current() helperPablo Neira Ayuso2014-07-221-13/+18
| | | | Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: add nft_batch_continue() helperPablo Neira Ayuso2014-07-221-28/+17
| | | | | | | Save some LOC with this function that wraps typical handling after pushing the netlink message into the batch. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: immediately return on errors in mnl_nft_ruleset_dump()Pablo Neira Ayuso2014-07-141-23/+24
| | | | | | If this fails to fetch any of the objects, stop handling inmediately. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add table netlink messages to the batchPablo Neira Ayuso2014-05-191-0/+34
| | | | | | | This patch moves the table messages to the netlink batch that is sent to kernel-space. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add chain netlink messages to the batchPablo Neira Ayuso2014-05-191-0/+35
| | | | | | | This patch moves the chain netlink messages to the big netlink batch that is sent to kernel-space. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add set netlink message to the batchPablo Neira Ayuso2014-05-191-0/+129
| | | | | | | | | | | | | This patch moves the netlink set messages to the batch that contains the rules. This helps to speed up rule-set restoration time by changing the operational. To achieve this, an internal set ID which is unique to the batch is allocated as suggested by Patrick. To retain backward compatibility, nft initially guesses if the kernel supports set in batches. Otherwise, it falls back to the previous (slowier) operational. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: split talk() and recv() functionsArturo Borrero2014-04-281-30/+38
| | | | | | | | | | | Let's split talk() and recv() functions, so they can be used independently. While at it, lets rename mnl_talk() to nft_mnl_talk() so we avoid potential clashes with other functions in external libs. Suggested-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add events reportingArturo Borrero2014-04-251-0/+10
| | | | | | | | | | This patch adds a basic events reporting option to nft. The syntax is: % nft monitor [new|destroy] [tables|chains|rules|sets|elements] [xml|json] Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* Merge branch 'master' into next-3.14Pablo Neira Ayuso2014-02-031-0/+10
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| * mnl: fix inclusion of last rule in batch pagePablo Neira Ayuso2014-01-301-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes the inclusion of the last rule that didn't fit into a batch page. When using sets this has manifested with the -EBUSY error when deleting the table (it was still containing unused sets after the flush). The following command line works fine here: nft -f test ; nft flush table filter ; nft delete chain filter output; nft delete table filter Tested using this kernel patch: http://patchwork.ozlabs.org/patch/314143/ Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* | ruleset: add XML/JSON exportArturo Borrero Gonzalez2014-01-231-1/+63
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds the following operation: :~# nft export <xml|json> The XML/JSON output is provided raw by libnftnl, thus without format. In case of XML, you can give format with the `xmllint' tool from libxml2-tools: :~# nft list ruleset xml | xmllint --format - In case of JSON, you can use `json_pp' from perl standar package: :~# nft list ruleset json | json_pp A format field is added in struct cmd, and it will be reused in the import operation. Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* | cmd: add create command for tables and chainsPatrick McHardy2014-01-211-7/+7
|/ | | | | | | | | We currently always use NLM_F_EXCL for add, which makes adding existing chains or tables fail. There's usually no reason why you would care about this, so change "add" to not use NLM_F_EXCL and add a new "create" command in case you do care. Signed-off-by: Patrick McHardy <kaber@trash.net>
* use new libnftnl library namePablo Neira Ayuso2014-01-201-5/+5
| | | | | | Adapt the current code to use the new library name libnftnl. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: fix chain type autoloadingPablo Neira Ayuso2014-01-171-1/+1
| | | | | | | | Add missing NLM_F_CREATE flag when creating new chains to trigger module autoloading in the kernel. Reported-by: Ana Rey Botello <anarey@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add new --debug=mnl option to enable libmnl debuggingPablo Neira Ayuso2014-01-161-2/+2
| | | | | | | This allows you to dump the netlink message that is send via libmnl. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* nftables: fix supression of "permission denied" errorsPatrick McHardy2014-01-091-3/+5
| | | | | | | | | | | | | | Introduction of batch support broke displaying of EPERM since those are generated by the kernel before batch processing starts and thus have the sequence number of the NFNL_MSG_BATCH_BEGIN message instead of the command messages. Also only a single error message is generated for the entire batch. This patch fixes this by noting the batch sequence number and displaying the error for all commands since this is what would happen if the permission check was inside batch processing as every other check. Signed-off-by: Patrick McHardy <kaber@trash.net>
* mnl: print netlink message if if --debug=netlink in mnl_talk()Pablo Neira Ayuso2013-12-281-0/+5
| | | | | | Useful for debugging purposes. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: don't set NLM_F_ACK flag in mnl_nft_rule_batch_[add|del]Pablo Neira Ayuso2013-12-071-2/+2
| | | | | | | | If the NLM_F_ACK flag is unset, the kernel still explicitly reports errors. Thus, we can save the handling of many explicit (useless) ack messages that indicate success. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: fix inconsistent name usage in nft_*_nlmsg_build_hdr callsArturo Borrero2013-12-041-22/+22
| | | | | | | Minor fix, given that all those functions are aliases. Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: fix typo in commentEric Leblond2013-10-031-1/+1
| | | | | Signed-off-by: Eric Leblond <eric@regit.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: add rule batching supportPablo Neira Ayuso2013-09-231-0/+250
| | | | | | | | | | | | | | | | | | | | | | | This patch allows nft to put all rule update messages into one single batch that is sent to the kernel if `-f' option is used. In order to provide fine grain error reporting, I decided to to correlate the netlink message sequence number with the correspoding command sequence number, which is the same. Thus, nft can identify what rules trigger problems inside a batch and report them accordingly. Moreover, to avoid playing buffer size games at batch building stage, ie. guess what is the final size of the batch for this ruleset update will be, this patch collects batch pages that are converted to iovec to ensure linearization when the batch is sent to the kernel. This reduces the amount of unnecessary memory usage that is allocated for the batch. This patch uses the libmnl nlmsg batching infrastructure and it requires the kernel patch entitled (netfilter: nfnetlink: add batch support and use it from nf_tables). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: Add support for insertion inside rule listEric Leblond2013-07-191-1/+1
| | | | | | | | | | | | | | This patch adds support to insert and to add rule using a rule handle as reference. The rule handle syntax has an new optional position field which take a handle as argument. Two examples: nft add rule filter output position 5 ip daddr 1.2.3.1 drop nft insert rule filter output position 5 ip daddr 1.2.3.1 drop Signed-off-by: Eric Leblond <eric@regit.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* mnl: use nft_*_list_add_tailPablo Neira Ayuso2013-07-161-4/+4
| | | | | | | Adapt it to the semantic fix that has been applied to libnftables, nft_*_list_add now inserts nodes, instead of appending them. Signed-off-by: Pablo Neira Ayuso <pablo@soleta.eu>
* src: use libnftablesPablo Neira Ayuso2013-06-241-0/+478
This patch migrates nft to use the libnftables library, that is used by the iptables over nftables compat utility as well. Most of the conversion was pretty straight forward. Some small significant changes happened in the handling of set element and immediate data abstraction that libnl provides. libnftables is a bit more granular since it splits the struct nfnl_nft_data into three attributes: verdict, chain and plain data (used in maps). I have added a new file src/mnl.c that contains the low level netlink communication that now resides in nftables source tree instead of the library. This should help to implement the batching support using libmnl in follow up patches. I also spent some significant amount of time running my tests to make sure that we don't increase the number of bugs that we already have (I plan to provide a list of those that I have detected and diagnosed, so anyone else can help us to fix them). As a side effect, this change should also prepare the ground for JSON and XML support anytime soon. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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