Clarify IFA_LOCAL code in kernel_netlink.

kernel_netlink.c

@@ -1334,13 +1334,16 @@ parse_addr_rta(struct ifaddrmsg *addr, int len, struct in6_addr *res)
     struct rtattr *rta;
     len -= NLMSG_ALIGN(sizeof(*addr));
     rta = IFA_RTA(addr);
-    int has_local = 0; /* A _LOCAL TLV may be bound with a _ADDRESS' which
-        represents the peer's address.  In this case, ignore _ADDRESS. */
+    int is_local = 0;
 
     while(RTA_OK(rta, len)) {
         switch(rta->rta_type) {
         case IFA_LOCAL:
-            has_local = 1;
+            /* On some point-to-point technologies, there's both _LOCAL
+               and _ADDRESS, and _ADDRESS is apparently the peer address
+               while _LOCAL is the one we want. */
+            is_local = 1;
+            /* fallthrough */
         case IFA_ADDRESS:
             switch(addr->ifa_family) {
             case AF_INET:
@@ -1357,7 +1360,7 @@ parse_addr_rta(struct ifaddrmsg *addr, int len, struct in6_addr *res)
                 return -1;
                 break;
             }
-            if(has_local)
+            if(is_local)
                 return 0;
             break;
         default: