ND6 / SIOCGNBRINFO_IN6 is the only subsystem using this struct.
Memory is allocated with the net lock held (incl. asserts) through
if_attach() -> if_attachsetup() -> if_attachdomain()
-> dom_ifattach/in6_domifattach()
Conversly, deallocation happens through
if_deattach() -> ... -> in6_domifattach()
ND6 then reads/writes this data through ND_IFINFO(), all occurences in
netinet6/nd6{,_nbr}.c are protected by the net lock (incl. asserts).
Same goes for the ones in netinet/tcp_input.c through ND6_HINT().
Comment copied from if_attachdomain() and fitted < 80 chars.
Feedback? Objection? OK?
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index b5ebe479b73..bddccd2443a 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -186,7 +186,7 @@ struct ifnet { /* and the
entries */
struct sockaddr_dl *if_sadl; /* [N] pointer to our sockaddr_dl */
- void *if_afdata[AF_MAX];
+ void *if_afdata[AF_MAX]; /* [N] AF dependent data region */
};
#define if_mtu if_data.ifi_mtu
#define if_type if_data.ifi_type
