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Date: Mon, 4 Jun 2012 14:21:18 +0200 From: pablo@...filter.org To: netfilter-devel@...r.kernel.org Cc: netdev@...r.kernel.org Subject: [PATCH 0/7] [RFC] new user-space connection tracking helper infrastructure From: Pablo Neira Ayuso <pablo@...filter.org> Hi! This is a new try to provide a full user-space connection tracking helper infrastructure. Some of you, that check my tree, already know that I've been working on this since time ago. Previous approaches had important limitations and the integration with iptables was not precisely nice. The initial patches prepare the field for the introduction of the cthelper infrastructure: 1) allocate fixed area for helper name, as a side effect, the initialization code of the kernel-space helpers looks better IMO. 2) allow variable length conntrack extensions. 3) add support for variable length helper extensions. 4) improve integration between nfnetlink_queue and ctnetlink. Now, you don't have to open two handlers listen to packets via nfqueue and receive events via ctnetlink. Instead, you can enable one flag to get the conntrack data together with the packet via nfqueue. 5) improve integration of packet mangling and nf_conntrack. This has been a long standing issue. If you mangle one TCP packet in user-space and connection tracking is enabled, nf_ct_tcp reports sequence tracking errors. This patch aims to resolve this issue. 6) Add CTA_HELP_INFO attribute. This is used to store the private helper data. Thus, we don't need to keep a redundant cache of conntrack entries in user-space. The private helper information is stored. 7) finally, the netlink cthelper infrastructure. Of course, this patch makes no sense without the user-space changes, they are: * updates in the conntrack-tools (see cthelper11 branch): http://git.netfilter.org/cgi-bin/gitweb.cgi?p=conntrack-tools.git;a=shortlog;h=refs/heads/cthelper11 It includes the FTP user-space helper, one RPC helper (for NFSv3) and one TNS helper (for Oracle). * libnetfilter_cthelper http://git.netfilter.org/cgi-bin/gitweb.cgi?p=libnetfilter_cthelper.git;a=summary * libnetfilter_conntrack (new libmnl API) http://git.netfilter.org/cgi-bin/gitweb.cgi?p=libnetfilter_conntrack.git;a=summary * libnetfilter_queue http://git.netfilter.org/cgi-bin/gitweb.cgi?p=libnetfilter_queue.git;a=shortlog;h=refs/heads/cthelper2 WARNING: Changes may occur in the user-space side until all those cthelper branches are merged into master. Mind that this is work-in-progress. Pablo Neira Ayuso (7): netfilter: nf_ct_helper: allocate 16 bytes for the helper and policy names netfilter: nf_ct_ext: support variable length extensions netfilter: nf_ct_helper: implement variable length helper private data netfilter: add glue code to integrate nfnetlink_queue and ctnetlink netfilter: nfnl_queue: support NAT TCP sequence adjustment if packet mangled netfilter: ctnetlink: add CTA_HELP_INFO attribute netfilter: add user-space connection tracking helper infrastructure include/linux/netfilter.h | 10 + include/linux/netfilter/Kbuild | 1 + include/linux/netfilter/nf_conntrack_sip.h | 1 + include/linux/netfilter/nfnetlink.h | 3 +- include/linux/netfilter/nfnetlink_conntrack.h | 1 + include/linux/netfilter/nfnetlink_cthelper.h | 55 ++ include/linux/netfilter/nfnetlink_queue.h | 7 + include/linux/netfilter_ipv4.h | 1 + include/linux/netfilter_ipv6.h | 1 + include/net/netfilter/nf_conntrack.h | 35 +- include/net/netfilter/nf_conntrack_expect.h | 4 +- include/net/netfilter/nf_conntrack_extend.h | 7 +- include/net/netfilter/nf_conntrack_helper.h | 29 +- include/net/netfilter/nf_nat_helper.h | 7 + net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 56 +- net/ipv4/netfilter/nf_nat_amanda.c | 4 +- net/ipv4/netfilter/nf_nat_h323.c | 8 +- net/ipv4/netfilter/nf_nat_helper.c | 13 + net/ipv4/netfilter/nf_nat_pptp.c | 6 +- net/ipv4/netfilter/nf_nat_sip.c | 14 +- net/ipv4/netfilter/nf_nat_tftp.c | 4 +- net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c | 56 +- net/netfilter/Kconfig | 8 + net/netfilter/Makefile | 1 + net/netfilter/core.c | 4 + net/netfilter/nf_conntrack_core.c | 3 +- net/netfilter/nf_conntrack_extend.c | 16 +- net/netfilter/nf_conntrack_ftp.c | 11 +- net/netfilter/nf_conntrack_h323_main.c | 16 +- net/netfilter/nf_conntrack_helper.c | 35 +- net/netfilter/nf_conntrack_irc.c | 8 +- net/netfilter/nf_conntrack_netlink.c | 190 ++++++- net/netfilter/nf_conntrack_pptp.c | 17 +- net/netfilter/nf_conntrack_proto_gre.c | 16 +- net/netfilter/nf_conntrack_sane.c | 12 +- net/netfilter/nf_conntrack_sip.c | 36 +- net/netfilter/nf_conntrack_tftp.c | 8 +- net/netfilter/nfnetlink_cthelper.c | 668 ++++++++++++++++++++++++ net/netfilter/nfnetlink_queue.c | 84 ++- net/netfilter/xt_CT.c | 44 +- 40 files changed, 1309 insertions(+), 191 deletions(-) create mode 100644 include/linux/netfilter/nfnetlink_cthelper.h create mode 100644 net/netfilter/nfnetlink_cthelper.c -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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