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Add DHCPv6 ntp-server (56) option handling.

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There was discussion in the past regarding DHCPv6 NTP server option
which needs special subclassing per RFC5908.

Patch adds support for unicast, multicast IPv6 address and for FQDN string,
preserving possibly used (as suggested earlier) hex value.

Unfortunately it's still not fully free from limitations - only address list or
only fqdn value list is possible, not mixed due current
state option parsing & flagging.
This commit is contained in:
Vladislav Grishenko
2020-03-08 15:34:34 +00:00
committed by Simon Kelley
parent b594e8defa
commit dded78b233
4 changed files with 41 additions and 8 deletions
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24
src/rfc3315.c
View File

@@ -1311,23 +1311,39 @@ static struct dhcp_netid *add_options(struct state *state, int do_refresh)
for (a = (struct in6_addr *)opt_cfg->val, j = 0; j < opt_cfg->len; j+=IN6ADDRSZ, a++)
{
struct in6_addr *p = NULL;
if (IN6_IS_ADDR_UNSPECIFIED(a))
{
if (!add_local_addrs(state->context))
put_opt6(state->fallback, IN6ADDRSZ);
p = state->fallback;
}
else if (IN6_IS_ADDR_ULA_ZERO(a))
{
if (!IN6_IS_ADDR_UNSPECIFIED(state->ula_addr))
put_opt6(state->ula_addr, IN6ADDRSZ);
p = state->ula_addr;
}
else if (IN6_IS_ADDR_LINK_LOCAL_ZERO(a))
{
if (!IN6_IS_ADDR_UNSPECIFIED(state->ll_addr))
put_opt6(state->ll_addr, IN6ADDRSZ);
p = state->ll_addr;
}
else
put_opt6(a, IN6ADDRSZ);
p = a;
if (!p)
continue;
else if (opt_cfg->opt == OPTION6_NTP_SERVER)
{
if (IN6_IS_ADDR_MULTICAST(p))
o1 = new_opt6(NTP_SUBOPTION_MC_ADDR);
else
o1 = new_opt6(NTP_SUBOPTION_SRV_ADDR);
put_opt6(p, IN6ADDRSZ);
end_opt6(o1);
}
else
put_opt6(p, IN6ADDRSZ);
}
end_opt6(o);