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New option retrieve-vlan (experimental)

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This commit is contained in:
Gerhard Rieger 2023-09-30 15:18:39 +02:00
parent 11d1e9e11f
commit b5640dd707
24 changed files with 273 additions and 55 deletions

15
doc/socat.yo
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@ -3004,9 +3004,20 @@ startdit()enddit()nl()
label(GROUP_INTERFACE)em(bf(INTERFACE option group))
Options that control Linux INTERFACE addresses.
These options may be applied to addresses link(INTERFACE)(ADDRESS_INTERFACE) and
link(TUN)(ADDRESS_TUN). These address types and options are currently only
implemented on Linux operating system.
Note regarding VLANs: On incoming packets the Linux kernel strips off the VLAN
tag before passing the data to the user space program on raw sockets. Special
measures are required to get the VLAN information, see NOEXPAND(packet(7)) PACKET_AUXDATA,
and to optionally insert the tag into the packet again, use option
link(retrieve-vlan)(OPTION_RETRIEVE_VLAN) when you need this.
label(OPTION_RETRIEVE_VLAN)dit(bf(tt(retrieve-vlan)))
On packets incoming on raw sockets, retrieve the VLAN information and insert
it into the packets for further processing (Linux)
startdit()
label(OPTION_IFF_UP)dit(bf(tt(iff-up)))
Sets the TUN network interface status UP. Strongly recommended.
label(OPTION_IFF_BROADCAST)dit(bf(tt(iff-broadcast)))