xnu-2422.1.72.tar.gz

[apple/xnu.git] / bsd / netinet6 / ip6_id.c

diff --git a/bsd/netinet6/ip6_id.c b/bsd/netinet6/ip6_id.c
index 26fffd286dec2c7fe6cb7d44366609e599cae775..eab70a6c01ea63dfa6fad8e0ca11a47e78dac967 100644 (file)
--- a/bsd/netinet6/ip6_id.c
+++ b/bsd/netinet6/ip6_id.c
@@ -1,8 +1,8 @@
 /*
- * Copyright (c) 2009 Apple Inc. All rights reserved.
+ * Copyright (c) 2009-2013 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- * 
+ *
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
@@ -11,10 +11,10 @@
  * unlawful or unlicensed copies of an Apple operating system, or to
  * circumvent, violate, or enable the circumvention or violation of, any
  * terms of an Apple operating system software license agreement.
- * 
+ *
  * Please obtain a copy of the License at
  * http://www.opensource.apple.com/apsl/ and read it before using this file.
- * 
+ *
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
@@ -22,7 +22,7 @@
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.
- * 
+ *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 
@@ -53,8 +53,6 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- *
- *     $KAME: ip6_id.c,v 1.13 2003/09/16 09:11:19 itojun Exp $
  */
 
 /*-
@@ -90,8 +88,6 @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * $OpenBSD: ip_id.c,v 1.6 2002/03/15 18:19:52 millert Exp $
  */
 
 #include <sys/cdefs.h>
@@ -122,7 +118,9 @@
 #include <sys/time.h>
 #include <sys/kernel.h>
 #include <sys/random.h>
+#include <sys/protosw.h>
 #include <libkern/libkern.h>
+#include <dev/random/randomdev.h>
 
 #include <net/if.h>
 #include <net/route.h>
@@ -130,10 +128,6 @@
 #include <netinet/ip6.h>
 #include <netinet6/ip6_var.h>
 
-#ifndef INT32_MAX
-#define INT32_MAX      0x7fffffffU
-#endif
-
 struct randomtab {
        const int       ru_bits; /* resulting bits */
        const long      ru_out; /* Time after wich will be reseeded */
@@ -215,26 +209,24 @@ pmod(u_int32_t gen, u_int32_t expo, u_int32_t mod)
 static void
 initid(struct randomtab *p)
 {
+       time_t curtime = (time_t)net_uptime();
        u_int32_t j, i;
        int noprime = 1;
-       struct timeval timenow;
-       
-       getmicrotime(&timenow);
 
-       p->ru_x = random() % p->ru_m;
+       p->ru_x = RandomULong() % p->ru_m;
 
        /* (bits - 1) bits of random seed */
-       p->ru_seed = random() & (~0U >> (32 - p->ru_bits + 1));
-       p->ru_seed2 = random() & (~0U >> (32 - p->ru_bits + 1));
+       p->ru_seed = RandomULong() & (~0U >> (32 - p->ru_bits + 1));
+       p->ru_seed2 = RandomULong() & (~0U >> (32 - p->ru_bits + 1));
 
        /* Determine the LCG we use */
-       p->ru_b = (random() & (~0U >> (32 - p->ru_bits))) | 1;
+       p->ru_b = (RandomULong() & (~0U >> (32 - p->ru_bits))) | 1;
        p->ru_a = pmod(p->ru_agen,
-           (random() & (~0U >> (32 - p->ru_bits))) & (~1U), p->ru_m);
+           (RandomULong() & (~0U >> (32 - p->ru_bits))) & (~1U), p->ru_m);
        while (p->ru_b % 3 == 0)
                p->ru_b += 2;
 
-       j = random() % p->ru_n;
+       j = RandomULong() % p->ru_n;
 
        /*
         * Do a fast gcd(j, RU_N - 1), so we can find a j with
@@ -255,23 +247,21 @@ initid(struct randomtab *p)
        p->ru_g = pmod(p->ru_gen, j, p->ru_n);
        p->ru_counter = 0;
 
-       p->ru_reseed = timenow.tv_sec + p->ru_out;
+       p->ru_reseed = curtime + p->ru_out;
        p->ru_msb = p->ru_msb ? 0 : (1U << (p->ru_bits - 1));
 }
 
 static u_int32_t
 randomid(struct randomtab *p)
 {
+       time_t curtime = (time_t)net_uptime();
        int i, n;
        u_int32_t tmp;
-       struct timeval timenow;
-
-       getmicrotime(&timenow);
 
-       if (p->ru_counter >= p->ru_max || timenow.tv_sec > p->ru_reseed)
+       if (p->ru_counter >= p->ru_max || curtime > p->ru_reseed)
                initid(p);
 
-       tmp = random();
+       tmp = RandomULong();
 
        /* Skip a random number of ids */
        n = tmp & 0x3; tmp = tmp >> 2;
@@ -280,25 +270,25 @@ randomid(struct randomtab *p)
 
        for (i = 0; i <= n; i++) {
                /* Linear Congruential Generator */
-               p->ru_x = (u_int32_t)((u_int64_t)p->ru_a * p->ru_x + p->ru_b) % p->ru_m;
+               p->ru_x = ((u_int64_t)p->ru_a * p->ru_x + p->ru_b) % p->ru_m;
        }
 
        p->ru_counter += i;
 
-       return (p->ru_seed ^ pmod(p->ru_g, p->ru_seed2 ^ p->ru_x, p->ru_n)) |
-           p->ru_msb;
+       return ((p->ru_seed ^ pmod(p->ru_g, p->ru_seed2 ^ p->ru_x, p->ru_n)) |
+           p->ru_msb);
 }
 
 u_int32_t
 ip6_randomid(void)
 {
 
-       return randomid(&randomtab_32);
+       return (randomid(&randomtab_32));
 }
 
 u_int32_t
 ip6_randomflowlabel(void)
 {
 
-       return randomid(&randomtab_20) & 0xfffff;
+       return (randomid(&randomtab_20) & 0xfffff);
 }