xnu-1228.tar.gz

[apple/xnu.git] / bsd / netinet6 / nd6.h

diff --git a/bsd/netinet6/nd6.h b/bsd/netinet6/nd6.h
index 8f525ce3358564e0644e0d134df8d00ced32153b..b85be0157ceaca7c878066beb883ef81daeee043 100644 (file)
--- a/bsd/netinet6/nd6.h
+++ b/bsd/netinet6/nd6.h
@@ -188,6 +188,24 @@ struct     in6_ndifreq {
 #define ND6_INFINITE_LIFETIME          0xffffffff
 
 #ifdef KERNEL_PRIVATE
+#define ND_IFINFO(ifp) \
+       (&nd_ifinfo[(ifp)->if_index])
+/*
+ * In a more readable form, we derive linkmtu based on:
+ *
+ * if (ND_IFINFO(ifp)->linkmtu && ND_IFINFO(ifp)->linkmtu < ifp->if_mtu)
+ *         linkmtu = ND_IFINFO(ifp)->linkmtu;
+ * else if ((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < ifp->if_mtu))
+ *         linkmtu = ND_IFINFO(ifp)->maxmtu;
+ * else
+ *         linkmtu = ifp->if_mtu;
+ */
+#define IN6_LINKMTU(ifp)                                                     \
+       ((ND_IFINFO(ifp)->linkmtu &&                                          \
+       ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) ? ND_IFINFO(ifp)->linkmtu :  \
+       ((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) ? \
+       ND_IFINFO(ifp)->maxmtu : (ifp)->if_mtu))
+
 /* node constants */
 #define MAX_REACHABLE_TIME             3600000 /* msec */
 #define REACHABLE_TIME                 30000   /* msec */
@@ -230,7 +248,8 @@ struct nd_prefix {
        /* list of routers that advertise the prefix: */
        LIST_HEAD(pr_rtrhead, nd_pfxrouter) ndpr_advrtrs;
        u_char  ndpr_plen;
-       int     ndpr_refcnt;    /* reference couter from addresses */
+       int     ndpr_refcnt;    /* reference counter from addresses */
+       int     ndpr_usecnt;    /* actual use count; prevents free */
 };
 
 #define ndpr_next              ndpr_entry.le_next
@@ -398,6 +417,8 @@ int in6_init_prefix_ltimes(struct nd_prefix *ndpr);
 void rt6_flush(struct in6_addr *, struct ifnet *);
 int nd6_setdefaultiface(int);
 int in6_tmpifadd(const struct in6_ifaddr *, int);
+void ndpr_hold(struct nd_prefix *, boolean_t);
+void ndpr_rele(struct nd_prefix *, boolean_t);
 #endif /* KERNEL_PRIVATE */
 
 #ifdef KERNEL