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Check if the Linux kernel is >= 2.6.26, otherwise it does not support
kernel-space filtering. This is not clean but we have no choice, the BSF
infrastructure does not return ENOTSUPP for unsupported operations.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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With this patch, we rely on the real source and destination of the
packet to perform the filter. The current NAT detection tweak is broken
for certain situations.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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We hit error if we try to change the expected bit for already existing
conntracks. On the other hand, if the conntrack does not exist, do not
change the expected bit, otherwise we also hit error.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Commit master entries before related ones to avoid ENOENT errors.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds nl_get_conntrack and it changes the behaviour of
nl_exist_conntrack. Now, nl_get_conntrack requests the kernel for
a conntrack and updates the cached entry. On the other hand,
nl_exist_conntrack only inquiries for the existence of the
entry.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Some users have reported crashes when nf_conntrack_ipv6 was not present.
This patch performs more robust sanity checks in the input path.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds support for kernel-space filtering via BSF by means of
the libnetfilter_conntrack's BSF high-level API.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch reworks the user-space filtering. Although we have
kernel-space filtering since Linux kernel >= 2.6.26, we keep userspace
filtering to ensure backward compatibility. Moreover, this patch
prepares the implementation of the kernel-space filtering via
libnetfilter_conntrack's high-level berkeley socket filter API.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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only which is incompatible AFAIK
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has been Max Kellermann and has no issues with relicensing their contributions.
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whitespace cleanups
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Simplify logging infrastructure
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import only required C headers and put local headers on top to check
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use C99 integers (uint32_t instead of u_int32_t)
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add missing function prototypes
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o minor irrelevant fixes for uncommon error paths and fix several typos
o use LOG_INFO for connection logging, use LOG_NOTICE for other information
o minor error handling updates
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feature is particularly useful for active-active setup without connection persistency, ie. you cannot know which firewall would filter a packet that belongs to a connection.
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- add len field to nethdr
- implement buffered send/recv to batch messages
- stop using netlink format for network messages: use similar TLV-based format
- reduce synchronization messages size up to 60%
- introduce periodic alive messages for sync-nack protocol
- timeslice alarm implementation: remove alarm pthread, remove locking
- simplify debugging functions: use nfct_snprintf instead
- remove major use of libnfnetlink functions: use libnetfilter_conntrack API
- deprecate conntrackd -F, use conntrack -F instead
- major rework of the network infrastructure: much simple, less messy
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o remove reminiscents of delay destroy message and relax transitions
o remove confusing StripNAT parameter: NAT support enabled by default
o relax event tracking: *_update callbacks use cache_update_force
o use wraparound-aware functions after/before/between
o lots of cleanups
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- empty debug_ct function if DEBUG_CT is not set
- revisit overrun handler: this is a hard battle, just try to do our best here, call Patrick :)
- explicit warning message when netlink_buffer_max_growth is reached
- fix silly bug in stats-mode when dumping in XML format
- fix UDP handler for conntrack
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