* feat(dhcpv6): handle IA_NA/IA_PD requests and config options
Adds the DHCPv6 client request exchange with IA_NA/IA_PD handling,
reconfigure-renew (RFC 8415), DNS server and domain search options
(RFC 3646) and NTP server suboptions (RFC 5908).
Signed-off-by: Marvin Drees <marvin.drees@9elements.com>
* fix(dhcpv6): bound server-supplied option counts to prevent OOM
A DHCPv6 server may place arbitrarily many DNS servers, search domains,
NTP entries and delegated prefixes in a single message (RFC 8415). The
client appended every entry into growable slices with no upper bound, so
a malicious or misconfigured server could drive unbounded allocation.
Add a configurable Limits to RequestConfig (with safe defaults) capping
each repeated option. The backing arrays are sized to their caps once in
BeginRequest and reused across resets, so parsing a server message now
performs no allocation and stored entries stay bounded.
Add tests asserting the caps are enforced against a flooded Reply and that
option parsing is allocation-free after BeginRequest.
Signed-off-by: Marvin Drees <marvin.drees@9elements.com>
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Signed-off-by: Marvin Drees <marvin.drees@9elements.com>
Patricio Whittingslow
Marvin Drees