dhcp6: implement lastlease and lastleaseextend

Summary:
This has resulted in a fair churn of code, but in summary:
  *  TIMEDOUT state introduced
  *  lease binding split out from handledata
  *  generic fail function introduced to attempt rebind
     of lastlease
  *  extended addresses are remembered and purged when a
     lease is re-negotiated
  *  defaults of 0 are no longer hard coded for most timers

Fixes T128.

Test Plan:
Obtain a dhcp6 lease, kill dhcpcd and the dhcp6 server.
run with `--lastlease` and check it's applied correctly.
Also, observe timers to ensure it renews, rebinds and expires.
Do same, but now with `--lastleaseextend as well`.
Observe same timers, but it should not expire but become an
infinite lease until a new one appears.

Reviewers: shahid

Reviewed By: shahid

Maniphest Tasks: T128

Differential Revision: https://dev.marples.name/D125

1 files changed, 2 insertions, 2 deletions

diff --git a/src/ipv6.c b/src/ipv6.c
index dfc7a3cb..e94a1253 100644
--- a/src/ipv6.c
+++ b/src/ipv6.c
@@ -594,7 +594,7 @@ ipv6_deletedaddr(struct ipv6_addr *ia)
 #endif
 }
 
-static void
+void
 ipv6_deleteaddr(struct ipv6_addr *ia)
 {
 	struct ipv6_state *state;
@@ -1447,7 +1447,7 @@ ipv6_tryaddlinklocal(struct interface *ifp)
 
 struct ipv6_addr *
 ipv6_newaddr(struct interface *ifp, struct in6_addr *addr, uint8_t prefix_len,
-    short flags)
+    int flags)
 {
 	struct ipv6_addr *ia;
 	char buf[INET6_ADDRSTRLEN];