[IPV6]: ADDRCONF: Use our standard algorithm for randomized ifid.

RFC 3041 describes an algorithm to generate random interface
identifier.  In RFC 3041bis, it is allowed to use different
algorithm than one described in RFC 3041.

So, let's use our standard pseudo random algorithm to simplify
our implementation.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 44 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 441eeacfc851..c92f3d6a8f13 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -78,8 +78,6 @@
 
 #ifdef CONFIG_IPV6_PRIVACY
 #include <linux/random.h>
-#include <linux/crypto.h>
-#include <linux/scatterlist.h>
 #endif
 
 #include <asm/uaccess.h>
@@ -110,8 +108,6 @@ static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpad
 static void ipv6_regen_rndid(unsigned long data);
 
 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
-static struct crypto_tfm *md5_tfm;
-static DEFINE_SPINLOCK(md5_tfm_lock);
 #endif
 
 static int ipv6_count_addresses(struct inet6_dev *idev);
@@ -371,8 +367,6 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
                 in6_dev_hold(ndev);
 
 #ifdef CONFIG_IPV6_PRIVACY
-                get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
-                get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
                 init_timer(&ndev->regen_timer);
                 ndev->regen_timer.function = ipv6_regen_rndid;
                 ndev->regen_timer.data = (unsigned long) ndev;
@@ -1376,34 +1370,9 @@ static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
 static int __ipv6_regen_rndid(struct inet6_dev *idev)
 {
-        struct net_device *dev;
-        struct scatterlist sg[2];
-
-        sg_set_buf(&sg[0], idev->entropy, 8);
-        sg_set_buf(&sg[1], idev->work_eui64, 8);
-
-        dev = idev->dev;
-
-        if (ipv6_generate_eui64(idev->work_eui64, dev)) {
-                printk(KERN_INFO
-                        "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
-                        idev);
-                get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
-        }
 regen:
-        spin_lock(&md5_tfm_lock);
-        if (unlikely(md5_tfm == NULL)) {
-                spin_unlock(&md5_tfm_lock);
-                return -1;
-        }
-        crypto_digest_init(md5_tfm);
-        crypto_digest_update(md5_tfm, sg, 2);
-        crypto_digest_final(md5_tfm, idev->work_digest);
-        spin_unlock(&md5_tfm_lock);
-
-        memcpy(idev->rndid, &idev->work_digest[0], 8);
+        get_random_bytes(idev->rndid, sizeof(idev->rndid));
         idev->rndid[0] &= ~0x02;
-        memcpy(idev->entropy, &idev->work_digest[8], 8);
 
         /*
          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
@@ -3759,13 +3728,6 @@ int __init addrconf_init(void)
 
         register_netdevice_notifier(&ipv6_dev_notf);
 
-#ifdef CONFIG_IPV6_PRIVACY
-        md5_tfm = crypto_alloc_tfm("md5", 0);
-        if (unlikely(md5_tfm == NULL))
-                printk(KERN_WARNING
-                        "failed to load transform for md5\n");
-#endif
-
         addrconf_verify(0);
         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
 #ifdef CONFIG_SYSCTL
@@ -3828,11 +3790,6 @@ void __exit addrconf_cleanup(void)
 
         rtnl_unlock();
 
-#ifdef CONFIG_IPV6_PRIVACY
-        crypto_free_tfm(md5_tfm);
-        md5_tfm = NULL;
-#endif
-
 #ifdef CONFIG_PROC_FS
         proc_net_remove("if_inet6");
 #endif