From 5bc82be202f2b88fef7e6235e5586c1e83420dd3 Mon Sep 17 00:00:00 2001
From: tedu <tedu@openbsd.org>
Date: Thu, 18 Dec 2014 19:27:04 +0000
Subject: [PATCH] simple to use siphash here. ok deraadt

---
 usr.sbin/ospf6d/lsupdate.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/usr.sbin/ospf6d/lsupdate.c b/usr.sbin/ospf6d/lsupdate.c
index 60e355bd8ec..198309cf032 100644
--- a/usr.sbin/ospf6d/lsupdate.c
+++ b/usr.sbin/ospf6d/lsupdate.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: lsupdate.c,v 1.10 2013/03/25 14:29:35 markus Exp $ */
+/*	$OpenBSD: lsupdate.c,v 1.11 2014/12/18 19:27:04 tedu Exp $ */
 
 /*
  * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
@@ -18,7 +18,6 @@
  */
 
 #include <sys/types.h>
-#include <sys/hash.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <netinet/ip6.h>
@@ -27,6 +26,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <siphash.h>
 
 #include "ospf6.h"
 #include "ospf6d.h"
@@ -542,6 +542,8 @@ struct lsa_cache {
 	u_int32_t		 hashmask;
 } lsacache;
 
+SIPHASH_KEY lsacachekey;
+
 struct lsa_ref		*lsa_cache_look(struct lsa_hdr *);
 
 void
@@ -557,10 +559,17 @@ lsa_cache_init(u_int32_t hashsize)
 
 	for (i = 0; i < hs; i++)
 		LIST_INIT(&lsacache.hashtbl[i]);
+	arc4random_buf(&lsacachekey, sizeof(lsacachekey));
 
 	lsacache.hashmask = hs - 1;
 }
 
+uint32_t
+lsa_hash_hdr(const struct lsa_hdr *hdr)
+{
+	return SipHash24(&lsacachekey, hdr, sizeof(*hdr));
+}
+
 struct lsa_ref *
 lsa_cache_add(void *data, u_int16_t len)
 {
@@ -587,8 +596,7 @@ lsa_cache_add(void *data, u_int16_t len)
 	ref->len = len;
 	ref->refcnt = 1;
 
-	head = &lsacache.hashtbl[hash32_buf(&ref->hdr, sizeof(ref->hdr),
-	    HASHINIT) & lsacache.hashmask];
+	head = &lsacache.hashtbl[lsa_hash_hdr(&ref->hdr) & lsacache.hashmask];
 	LIST_INSERT_HEAD(head, ref, entry);
 	return (ref);
 }
@@ -626,8 +634,7 @@ lsa_cache_look(struct lsa_hdr *lsa_hdr)
 	struct lsa_cache_head	*head;
 	struct lsa_ref		*ref;
 
-	head = &lsacache.hashtbl[hash32_buf(lsa_hdr, sizeof(*lsa_hdr),
-	    HASHINIT) & lsacache.hashmask];
+	head = &lsacache.hashtbl[lsa_hash_hdr(lsa_hdr) & lsacache.hashmask];
 
 	LIST_FOREACH(ref, head, entry) {
 		if (memcmp(&ref->hdr, lsa_hdr, sizeof(*lsa_hdr)) == 0)
-- 
2.20.1