Required add fc00::/7 into predefined lists

[sergey-safarov]

Is your feature request related to a problem? Please describe.
In private IPv6 networks can be used the private IPv6 range 'Unique local address'.
https://en.wikipedia.org/wiki/Unique_local_address

This address space is not globally routable and should not used by default for ICE candidates.

Describe the solution you'd like
Required to add fc00::/7 as deny network into 'rfc1918.auto', 'wan.auto', 'wan_v6.auto' lists.

freeswitch/src/switch_core.c

Lines 1492 to 1512 in 122c589

	switch_network_list_add_cidr(rfc_list, "fe80::/10", SWITCH_TRUE);
	switch_core_hash_insert(IP_LIST.hash, tmp_name, rfc_list);
	tmp_name = "wan.auto";
	switch_network_list_create(&rfc_list, tmp_name, SWITCH_TRUE, IP_LIST.pool);
	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "Created ip list %s default (allow)\n", tmp_name);
	switch_network_list_add_cidr(rfc_list, "0.0.0.0/8", SWITCH_FALSE);
	switch_network_list_add_cidr(rfc_list, "10.0.0.0/8", SWITCH_FALSE);
	switch_network_list_add_cidr(rfc_list, "172.16.0.0/12", SWITCH_FALSE);
	switch_network_list_add_cidr(rfc_list, "192.168.0.0/16", SWITCH_FALSE);
	switch_network_list_add_cidr(rfc_list, "169.254.0.0/16", SWITCH_FALSE);
	switch_network_list_add_cidr(rfc_list, "100.64.0.0/10", SWITCH_FALSE);
	switch_network_list_add_cidr(rfc_list, "fe80::/10", SWITCH_FALSE);
	switch_core_hash_insert(IP_LIST.hash, tmp_name, rfc_list);
	tmp_name = "wan_v6.auto";
	switch_network_list_create(&rfc_list, tmp_name, SWITCH_TRUE, IP_LIST.pool);
	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "Created ip list %s default (allow)\n", tmp_name);
	switch_network_list_add_cidr(rfc_list, "0.0.0.0/0", SWITCH_FALSE);
	switch_network_list_add_cidr(rfc_list, "fe80::/10", SWITCH_FALSE);
	switch_core_hash_insert(IP_LIST.hash, tmp_name, rfc_list);

Additional context
Checked via FS source in the master branch

[rlaager]

I am not a developer on this project, but I recommend you submit a PR for this.

As far as the idea goes, it seems fine.

[sergey-safarov]

I have already submitted several PR, but they have not been accepted.
Reason required to write unit tests.
I cannot write unit tests.
But I can report an issue.