src: Localify global variables, style, and add two XXXs.

[Repository Conversion <srcmastr%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/328fc1903208
branches:  trunk
changeset: 318144:328fc1903208
user:      maxv <maxv%NetBSD.org@localhost>
date:      Fri Apr 13 11:32:44 2018 +0000
description:
Localify global variables, style, and add two XXXs.

diffstat:

 sys/netinet6/frag6.c |  26 ++++++++++++++++----------
 1 files changed, 16 insertions(+), 10 deletions(-)

diffs (89 lines):

diff -r 83697512a3bb -r 328fc1903208 sys/netinet6/frag6.c
--- a/sys/netinet6/frag6.c      Fri Apr 13 11:24:34 2018 +0000
+++ b/sys/netinet6/frag6.c      Fri Apr 13 11:32:44 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: frag6.c,v 1.70 2018/04/13 11:19:09 maxv Exp $  */
+/*     $NetBSD: frag6.c,v 1.71 2018/04/13 11:32:44 maxv Exp $  */
 /*     $KAME: frag6.c,v 1.40 2002/05/27 21:40:31 itojun Exp $  */
 
 /*
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: frag6.c,v 1.70 2018/04/13 11:19:09 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: frag6.c,v 1.71 2018/04/13 11:32:44 maxv Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_net_mpsafe.h"
@@ -59,8 +59,10 @@
 #include <net/net_osdep.h>
 
 /*
- * IP6 reassembly queue structure.  Each fragment
- * being reassembled is attached to one of these structures.
+ * IPv6 reassembly queue structure. Each fragment being reassembled is
+ * attached to one of these structures.
+ *
+ * XXX: Would be better to use TAILQ.
  */
 struct ip6q {
        u_int32_t       ip6q_head;
@@ -93,7 +95,6 @@
        bool            ip6af_mff;      /* more fragment bit in frag off */
 };
 
-
 static void frag6_enq(struct ip6asfrag *, struct ip6asfrag *);
 static void frag6_deq(struct ip6asfrag *);
 static void frag6_insque(struct ip6q *, struct ip6q *);
@@ -102,9 +103,9 @@
 
 static int frag6_drainwanted;
 
-u_int frag6_nfragpackets;
-u_int frag6_nfrags;
-struct ip6q ip6q;      /* ip6 reassembly queue */
+static u_int frag6_nfragpackets;
+static u_int frag6_nfrags;
+static struct ip6q ip6q;       /* ip6 reassembly queue */
 
 /* Protects ip6q */
 static kmutex_t        frag6_lock __cacheline_aligned;
@@ -216,6 +217,10 @@
         * a Fragment Header with the "Fragment Offset" equal to 0 and
         * the "M" bit equal to 0 MUST process such packet in isolation
         * from any other packets/fragments.
+        *
+        * XXX: Would be better to remove this fragment header entirely,
+        * for us not to get confused later when looking back at the
+        * previous headers in the chain.
         */
        fragoff = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK);
        if (fragoff == 0 && !(ip6f->ip6f_offlg & IP6F_MORE_FRAG)) {
@@ -664,7 +669,7 @@
 
        mutex_enter(&frag6_lock);
        q6 = ip6q.ip6q_next;
-       if (q6)
+       if (q6) {
                while (q6 != &ip6q) {
                        --q6->ip6q_ttl;
                        q6 = q6->ip6q_next;
@@ -674,6 +679,8 @@
                                frag6_freef(q6->ip6q_prev);
                        }
                }
+       }
+
        /*
         * If we are over the maximum number of fragments
         * (due to the limit being lowered), drain off
@@ -698,7 +705,6 @@
        rtcache_free(&ip6_forward_rt);
        rtcache_free(&ipsrcchk_rt);
 #endif
-
 }
 
 void