[src/trunk]: src/sys/netinet Dedup code.

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4b31f0397bc4
branches:  trunk
changeset: 359390:4b31f0397bc4
user:      maxv <maxv%NetBSD.org@localhost>
date:      Thu Feb 08 20:06:21 2018 +0000

description:
Dedup code.

diffstat:

 sys/netinet/tcp_input.c |  23 +++++++++--------------
 1 files changed, 9 insertions(+), 14 deletions(-)

diffs (58 lines):

diff -r c9937a706228 -r 4b31f0397bc4 sys/netinet/tcp_input.c
--- a/sys/netinet/tcp_input.c   Thu Feb 08 19:58:05 2018 +0000
+++ b/sys/netinet/tcp_input.c   Thu Feb 08 20:06:21 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tcp_input.c,v 1.369 2018/02/08 19:58:05 maxv Exp $     */
+/*     $NetBSD: tcp_input.c,v 1.370 2018/02/08 20:06:21 maxv Exp $     */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -148,7 +148,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tcp_input.c,v 1.369 2018/02/08 19:58:05 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tcp_input.c,v 1.370 2018/02/08 20:06:21 maxv Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -1274,6 +1274,12 @@
        }
 #endif
 
+       IP6_EXTHDR_GET(th, struct tcphdr *, m, toff, sizeof(struct tcphdr));
+       if (th == NULL) {
+               TCP_STATINC(TCP_STAT_RCVSHORT);
+               return;
+       }
+
        /*
         * Get IP and TCP header.
         * Note: IP leaves IP header in first mbuf.
@@ -1287,12 +1293,7 @@
 #endif
                af = AF_INET;
                iphlen = sizeof(struct ip);
-               IP6_EXTHDR_GET(th, struct tcphdr *, m, toff,
-                   sizeof(struct tcphdr));
-               if (th == NULL) {
-                       TCP_STATINC(TCP_STAT_RCVSHORT);
-                       return;
-               }
+
                /* We do the checksum after PCB lookup... */
                len = ntohs(ip->ip_len);
                tlen = len - toff;
@@ -1305,12 +1306,6 @@
                iphlen = sizeof(struct ip6_hdr);
                af = AF_INET6;
                ip6 = mtod(m, struct ip6_hdr *);
-               IP6_EXTHDR_GET(th, struct tcphdr *, m, toff,
-                   sizeof(struct tcphdr));
-               if (th == NULL) {
-                       TCP_STATINC(TCP_STAT_RCVSHORT);
-                       return;
-               }
 
                /*
                 * Be proactive about unspecified IPv6 address in source.