[Bug 242606] Low capacity of Variable "IPSEC_MANUAL_REQID_MAX" crashes StrongSwan IPSec/IKEV2 VPN Server

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242606

--- Comment #5 from Conrad Meyer <cem at freebsd.org> ---
Anyway, the comment in the header is clear enough: REQIDs over 0x3fff are
reserved for the kernel.  Linux uses this range for the kernel as well (see
net/key/af_key.c#L1915, gen_reqid()). They simply ignore bogus user requests
for higher numbers:

https://github.com/torvalds/linux/blob/master/net/key/af_key.c#L1959

                if (t->reqid > IPSEC_MANUAL_REQID_MAX)
                        t->reqid = 0;

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