Feel free to ack or reject these individually.

Kill redundant offsetof definitions. All of these files include sys/param.h.

Index: frag6.c
===================================================================
RCS file: /cvs/src/sys/netinet6/frag6.c,v
retrieving revision 1.32
diff -u -p -r1.32 frag6.c
--- frag6.c     6 Mar 2011 19:55:54 -0000       1.32
+++ frag6.c     19 Mar 2011 12:53:43 -0000
@@ -124,10 +124,6 @@ do {                                                       
                \
 
 #define        IP6Q_UNLOCK()           ip6q_unlock()
 
-#ifndef offsetof               /* XXX */
-#define        offsetof(type, member)  ((size_t)(&((type *)0)->member))
-#endif
-
 /*
  * Initialise reassembly queue and fragment identifier.
  */
Index: icmp6.c
===================================================================
RCS file: /cvs/src/sys/netinet6/icmp6.c,v
retrieving revision 1.113
diff -u -p -r1.113 icmp6.c
--- icmp6.c     9 Jul 2010 15:44:20 -0000       1.113
+++ icmp6.c     2 Apr 2011 11:46:06 -0000
@@ -1181,9 +1181,6 @@ icmp6_mtudisc_update(struct ip6ctlparam 
  * - joins NI group address at in6_ifattach() time only, does not cope
  *   with hostname changes by sethostname(3)
  */
-#ifndef offsetof               /* XXX */
-#define        offsetof(type, member)  ((size_t)(&((type *)0)->member))
-#endif
 struct mbuf *
 ni6_input(struct mbuf *m, int off)
 {
Index: in6_gif.c
===================================================================
RCS file: /cvs/src/sys/netinet6/in6_gif.c,v
retrieving revision 1.29
diff -u -p -r1.29 in6_gif.c
--- in6_gif.c   11 May 2010 09:36:07 -0000      1.29
+++ in6_gif.c   2 Apr 2011 11:45:41 -0000
@@ -69,10 +69,6 @@
 #include <netinet/ip_ether.h>
 #endif
 
-#ifndef offsetof
-#define offsetof(s, e) ((int)&((s *)0)->e)
-#endif
-
 /*
  * family - family of the packet to be encapsulate.
  */



As of r1.54 of nd6_rtr.c we don't add addresses in interrupt context anymore.
So this allocation can now wait:

Index: in6.c
===================================================================
RCS file: /cvs/src/sys/netinet6/in6.c,v
retrieving revision 1.89
diff -u -p -r1.89 in6.c
--- in6.c       7 Oct 2010 22:07:06 -0000       1.89
+++ in6.c       2 Apr 2011 12:02:04 -0000
@@ -910,14 +910,7 @@ in6_update_ifa(struct ifnet *ifp, struct
         */
        if (ia == NULL) {
                hostIsNew = 1;
-               /*
-                * When in6_update_ifa() is called in a process of a received
-                * RA, it is called under an interrupt context.  So, we should
-                * call malloc with M_NOWAIT.
-                */
-               ia = malloc(sizeof(*ia), M_IFADDR, M_NOWAIT | M_ZERO);
-               if (ia == NULL)
-                       return (ENOBUFS);
+               ia = malloc(sizeof(*ia), M_IFADDR, M_WAITOK | M_ZERO);
                LIST_INIT(&ia->ia6_memberships);
                /* Initialize the address and masks, and put time stamp */
                ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;



Typos in comments:

Index: ip6_input.c
===================================================================
RCS file: /cvs/src/sys/netinet6/ip6_input.c,v
retrieving revision 1.98
diff -u -p -r1.98 ip6_input.c
--- ip6_input.c 9 Sep 2010 09:46:13 -0000       1.98
+++ ip6_input.c 17 Dec 2010 21:54:45 -0000
@@ -974,8 +974,8 @@ ip6_process_hopopts(struct mbuf *m, u_in
 /*
  * Unknown option processing.
  * The third argument `off' is the offset from the IPv6 header to the option,
- * which is necessary if the IPv6 header the and option header and IPv6 header
- * is not continuous in order to return an ICMPv6 error.
+ * which allows returning an ICMPv6 error even if the IPv6 header and the
+ * option header are not continuous.
  */
 int
 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
Index: nd6.h
===================================================================
RCS file: /cvs/src/sys/netinet6/nd6.h,v
retrieving revision 1.27
diff -u -p -r1.27 nd6.h
--- nd6.h       6 Apr 2010 14:12:10 -0000       1.27
+++ nd6.h       24 Oct 2010 12:04:13 -0000
@@ -267,7 +267,7 @@ 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 */
 };
 
 #define ndpr_next              ndpr_entry.le_next

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