From: Roy Marples <roy@marples.name>
Date: Mon, 16 Dec 2019 16:56:17 +0000 (+0000)
Subject: DHCP6: Fix deprecating a delegated prefix
X-Git-Tag: v8.1.3~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fd70db72f05447d17188c8885a7f6743888c04b0;p=thirdparty%2Fdhcpcd.git

DHCP6: Fix deprecating a delegated prefix

Be sure to remove the address using the right TAILQ member.
While here, simplify the initialisation of pd_pfxs.
---

diff --git a/src/dhcp6.c b/src/dhcp6.c
index 6bda4845..fadf7144 100644
--- a/src/dhcp6.c
+++ b/src/dhcp6.c
@@ -2132,13 +2132,10 @@ dhcp6_findpd(struct interface *ifp, const uint8_t *iaid,
 			a->dadcallback = dhcp6_dadcallback;
 			a->ia_type = D6_OPTION_IA_PD;
 			memcpy(a->iaid, iaid, sizeof(a->iaid));
-			TAILQ_INIT(&a->pd_pfxs);
 			TAILQ_INSERT_TAIL(&state->addrs, a, next);
 		} else {
-			if (!(a->flags & IPV6_AF_DELEGATEDPFX)) {
+			if (!(a->flags & IPV6_AF_DELEGATEDPFX))
 				a->flags |= IPV6_AF_NEW | IPV6_AF_DELEGATEDPFX;
-				TAILQ_INIT(&a->pd_pfxs);
-			}
 			a->flags &= ~(IPV6_AF_STALE |
 			              IPV6_AF_EXTENDED |
 			              IPV6_AF_REQUEST);
diff --git a/src/ipv6.c b/src/ipv6.c
index 8a77a401..a83a1818 100644
--- a/src/ipv6.c
+++ b/src/ipv6.c
@@ -943,8 +943,17 @@ ipv6_addaddrs(struct ipv6_addrhead *addrs)
 			if (ap->flags & IPV6_AF_REQUEST) {
 				ap->flags &= ~IPV6_AF_ADDED;
 			} else {
-				TAILQ_REMOVE(addrs, ap, next);
-				ipv6_freeaddr(ap);
+#ifndef SMALL
+				if (ap->delegating_prefix != NULL &&
+				    addrs == &ap->delegating_prefix->pd_pfxs) {
+					TAILQ_REMOVE(addrs, ap, pd_next);
+					ap->delegating_prefix = NULL;
+				} else
+#endif
+				{
+					TAILQ_REMOVE(addrs, ap, next);
+					ipv6_freeaddr(ap);
+				}
 			}
 		} else if (!(ap->flags & IPV6_AF_STALE) &&
 		    !IN6_IS_ADDR_UNSPECIFIED(&ap->addr))
@@ -1544,6 +1553,10 @@ ipv6_newaddr(struct interface *ifp, const struct in6_addr *addr,
 	ia->prefix_len = prefix_len;
 	ia->dhcp6_fd = -1;
 
+#ifndef SMALL
+	TAILQ_INIT(&ia->pd_pfxs);
+#endif
+
 #ifdef IPV6_AF_TEMPORARY
 	tempaddr = ia->flags & IPV6_AF_TEMPORARY;
 #else