1. 18 Jun, 2012 17 commits
  2. 17 Jun, 2012 6 commits
  3. 16 Jun, 2012 12 commits
    • David S. Miller's avatar
      Merge branch 'master' of git://1984.lsi.us.es/nf-next · 82f437b9
      David S. Miller authored
      Pablo says:
      
      ====================
      This is the second batch of Netfilter updates for net-next. It contains the
      kernel changes for the new user-space connection tracking helper
      infrastructure.
      
      More details on this infrastructure are provides here:
      http://lwn.net/Articles/500196/
      
      
      
      Still, I plan to provide some official documentation through the
      conntrack-tools user manual on how to setup user-space utilities for this.
      So far, it provides two helper in user-space, one for NFSv3 and another for
      Oracle/SQLnet/TNS. Yet in my TODO list.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      82f437b9
    • Eldad Zack's avatar
      include/net/dst.h: neaten asterisk placement · 7f95e188
      Eldad Zack authored
      
      
      Fix code style - place the asterisk where it belongs.
      Signed-off-by: default avatarEldad Zack <eldad@fogrefinery.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7f95e188
    • Pablo Neira Ayuso's avatar
      netfilter: add user-space connection tracking helper infrastructure · 12f7a505
      Pablo Neira Ayuso authored
      
      
      There are good reasons to supports helpers in user-space instead:
      
      * Rapid connection tracking helper development, as developing code
        in user-space is usually faster.
      
      * Reliability: A buggy helper does not crash the kernel. Moreover,
        we can monitor the helper process and restart it in case of problems.
      
      * Security: Avoid complex string matching and mangling in kernel-space
        running in privileged mode. Going further, we can even think about
        running user-space helpers as a non-root process.
      
      * Extensibility: It allows the development of very specific helpers (most
        likely non-standard proprietary protocols) that are very likely not to be
        accepted for mainline inclusion in the form of kernel-space connection
        tracking helpers.
      
      This patch adds the infrastructure to allow the implementation of
      user-space conntrack helpers by means of the new nfnetlink subsystem
      `nfnetlink_cthelper' and the existing queueing infrastructure
      (nfnetlink_queue).
      
      I had to add the new hook NF_IP6_PRI_CONNTRACK_HELPER to register
      ipv[4|6]_helper which results from splitting ipv[4|6]_confirm into
      two pieces. This change is required not to break NAT sequence
      adjustment and conntrack confirmation for traffic that is enqueued
      to our user-space conntrack helpers.
      
      Basic operation, in a few steps:
      
      1) Register user-space helper by means of `nfct':
      
       nfct helper add ftp inet tcp
      
       [ It must be a valid existing helper supported by conntrack-tools ]
      
      2) Add rules to enable the FTP user-space helper which is
         used to track traffic going to TCP port 21.
      
      For locally generated packets:
      
       iptables -I OUTPUT -t raw -p tcp --dport 21 -j CT --helper ftp
      
      For non-locally generated packets:
      
       iptables -I PREROUTING -t raw -p tcp --dport 21 -j CT --helper ftp
      
      3) Run the test conntrackd in helper mode (see example files under
         doc/helper/conntrackd.conf
      
       conntrackd
      
      4) Generate FTP traffic going, if everything is OK, then conntrackd
         should create expectations (you can check that with `conntrack':
      
       conntrack -E expect
      
          [NEW] 301 proto=6 src=192.168.1.136 dst=130.89.148.12 sport=0 dport=54037 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.1.136 master-dst=130.89.148.12 sport=57127 dport=21 class=0 helper=ftp
      [DESTROY] 301 proto=6 src=192.168.1.136 dst=130.89.148.12 sport=0 dport=54037 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.1.136 master-dst=130.89.148.12 sport=57127 dport=21 class=0 helper=ftp
      
      This confirms that our test helper is receiving packets including the
      conntrack information, and adding expectations in kernel-space.
      
      The user-space helper can also store its private tracking information
      in the conntrack structure in the kernel via the CTA_HELP_INFO. The
      kernel will consider this a binary blob whose layout is unknown. This
      information will be included in the information that is transfered
      to user-space via glue code that integrates nfnetlink_queue and
      ctnetlink.
      Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
      12f7a505
    • Pablo Neira Ayuso's avatar
      netfilter: ctnetlink: add CTA_HELP_INFO attribute · ae243bee
      Pablo Neira Ayuso authored
      
      
      This attribute can be used to modify and to dump the internal
      protocol information.
      Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
      ae243bee
    • Pablo Neira Ayuso's avatar
      netfilter: nfnetlink_queue: add NAT TCP sequence adjustment if packet mangled · 8c88f87c
      Pablo Neira Ayuso authored
      User-space programs that receive traffic via NFQUEUE may mangle packets.
      If NAT is enabled, this usually puzzles sequence tracking, leading to
      traffic disruptions.
      
      With this patch, nfnl_queue will make the corresponding NAT TCP sequence
      adjustment if:
      
      1) The packet has been mangled,
      2) the NFQA_CFG_F_CONNTRACK flag has been set, and
      3) NAT is detected.
      
      There are some records on the Internet complaning about this issue:
      http://stackoverflow.com/questions/260757/packet-mangling-utilities-besides-iptables
      
      
      
      By now, we only support TCP since we have no helpers for DCCP or SCTP.
      Better to add this if we ever have some helper over those layer 4 protocols.
      Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
      8c88f87c
    • Pablo Neira Ayuso's avatar
      netfilter: add glue code to integrate nfnetlink_queue and ctnetlink · 9cb01766
      Pablo Neira Ayuso authored
      
      
      This patch allows you to include the conntrack information together
      with the packet that is sent to user-space via NFQUEUE.
      
      Previously, there was no integration between ctnetlink and
      nfnetlink_queue. If you wanted to access conntrack information
      from your libnetfilter_queue program, you required to query
      ctnetlink from user-space to obtain it. Thus, delaying the packet
      processing even more.
      
      Including the conntrack information is optional, you can set it
      via NFQA_CFG_F_CONNTRACK flag with the new NFQA_CFG_FLAGS attribute.
      Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
      9cb01766
    • Pablo Neira Ayuso's avatar
      netfilter: nf_ct_helper: implement variable length helper private data · 1afc5679
      Pablo Neira Ayuso authored
      
      
      This patch uses the new variable length conntrack extensions.
      
      Instead of using union nf_conntrack_help that contain all the
      helper private data information, we allocate variable length
      area to store the private helper data.
      
      This patch includes the modification of all existing helpers.
      It also includes a couple of include header to avoid compilation
      warnings.
      Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
      1afc5679
    • Pablo Neira Ayuso's avatar
      netfilter: nf_ct_ext: support variable length extensions · 3cf4c7e3
      Pablo Neira Ayuso authored
      
      
      We can now define conntrack extensions of variable size. This
      patch is useful to get rid of these unions:
      
      union nf_conntrack_help
      union nf_conntrack_proto
      union nf_conntrack_nat_help
      Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
      3cf4c7e3
    • Pablo Neira Ayuso's avatar
      netfilter: nf_ct_helper: allocate 16 bytes for the helper and policy names · 3a8fc53a
      Pablo Neira Ayuso authored
      
      
      This patch modifies the struct nf_conntrack_helper to allocate
      the room for the helper name. The maximum length is 16 bytes
      (this was already introduced in 2.6.24).
      
      For the maximum length for expectation policy names, I have
      also selected 16 bytes.
      
      This patch is required by the follow-up patch to support
      user-space connection tracking helpers.
      Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
      3a8fc53a
    • David S. Miller's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · aee289ba
      David S. Miller authored
      
      
      Conflicts:
      	net/ipv6/route.c
      
      Pull in 'net' again to get the revert of Thomas's change
      which introduced regressions.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      aee289ba
    • David S. Miller's avatar
      Revert "ipv6: Prevent access to uninitialized fib_table_hash via /proc/net/ipv6_route" · e8803b6c
      David S. Miller authored
      This reverts commit 2a0c451a
      
      .
      
      It causes crashes, because now ip6_null_entry is used before
      it is initialized.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e8803b6c
    • David S. Miller's avatar
      ipv6: Fix types of ip6_update_pmtu(). · 42ae66c8
      David S. Miller authored
      
      
      The mtu should be a __be32, not the mark.
      Reported-by: default avatarNeal Cardwell <ncardwell@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      42ae66c8
  4. 15 Jun, 2012 5 commits