Messages in this thread |  | | From | kuznet@ms2 ... | Subject | Re: Bind to protocol with AF_PACKET doesn't work for outgoing packets | Date | Thu, 1 Nov 2001 22:48:13 +0300 (MSK) |
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Hello!
> Just to have an symmetric API. Everything else is too ugly to explain > in manpages ;)
Explaining is easy. Blah-blah-blah... Sockets bound to ETH_P_ALL are able to get copy of output packets which is useful f.e. for packet sniffers (ref to [libpacp],[tcpdump]). In later kernels this can be disabled with option PACKET_NOOUTPUT. When this option is not supported user of packet socket bound to ETH_P_ALL has to filter output packets at user level checking for pkt_type == PACKET_OUTPUT or using an equivalent BPF applet.
> That would require changing/breaking PF_PACKET, no?
No. Ideally the option could be PACKET_GRAB_OUTPUT and be disabled by default (for symmetry :-)). But as soon as it was forgotten, it has to be enabled by default.
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