:len ends up being -13 because tp->t_maxopd = 64, optlen = 12, 
        :and ipoptlen = 65 (because ipsec_hdrsiz_tcp(tp) = 65.
        :
        :But I don't know, how to handle this case correctly.

A maxopd value of 64 seems really small.  What's the link MTU as
shown by ifconfig?

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