IPsec, kara_am

[am kara]

 are net/ipv4/ipip.c and net/ipv4/tunnel4.c necessary
 to implement IPsec for Linux? What is the general
 functionalities of these two files?

 IPsec is done by net/ ipv4/ah4.c and net/ipv4/esp4.c,
 isn't it? How are they connected with ipip.c and
 tunnel4.c?




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