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ntp+cmdmon: fix responding to link-local addresses

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After commit e49aececce ("socket: don't set interface for sent
packets") the NTP and cmdmon server stopped responding to requests from
link-local addresses.

Set the interface specifically for packets sent to a link-local address.
This commit is contained in:
Miroslav Lichvar
2020-06-30 16:13:48 +02:00
parent 99e3c67a81
commit 4e747da4b4
4 changed files with 28 additions and 4 deletions
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6
ntp_io.c
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@@ -454,8 +454,10 @@ NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
message.local_addr.ip = local_addr->ip_addr;
/* Don't require the response to use the same interface */
message.if_index = INVALID_IF_INDEX;
/* Don't require responses to non-link-local addresses to use the same
interface */
message.if_index = SCK_IsLinkLocalIPAddress(&message.remote_addr.ip.ip_addr) ?
local_addr->if_index : INVALID_IF_INDEX;
#if !defined(HAVE_IN_PKTINFO) && defined(IP_SENDSRCADDR)
/* On FreeBSD a local IPv4 address cannot be specified on bound socket */