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authorWillem de Bruijn <willemb@google.com>2016-08-10 15:23:07 -0400
committerPablo Neira Ayuso <pablo@netfilter.org>2016-08-12 12:46:26 +0200
commitbd1f88bf85100554d35e74273d907db1fdcd250f (patch)
tree6bbf358fd8dba3157872d43a1d0f23a58372a1f4 /extensions/libxt_cpu.man
parenta44bee8c3582cb72868a3b7f703494dd2b24bf7d (diff)
extensions/libxt_bpf.man: clarify BPF code generation with tcpdump
The xt_bpf module applies BPF bytecode to the packet. Depending on where the module is invoked, the kernel may pass a packet with or without link layer header. Iptables has no such header. A common `tcpdump -ddd <string>` compilation command may revert to a physical device that generates code for packets starting from the mac layer up (e.g., E10MB data link type: Ethernet). Clarify in the man page that when using this tool for code generation, a suitable target device must be chosen. Netfilter Bugzilla Bug #1048 Reported-by: Lorenzo Pistone <blaffablaffa@gmail.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'extensions/libxt_cpu.man')
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