Revert "netfilter: avoid get_random_bytes calls"

This reverts commit a42b99a6e329654d376b330de057eff87686d890.

Hannes Frederic Sowa reported some problems with this patch, more specifically
that prandom_u32() may not be ready at boot time, see:

http://marc.info/?l=linux-netdev&m=138896532403533&w=2

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

6 files changed, 13 insertions, 5 deletions

diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 7d4254b0dc6b..3c4b69e5fe17 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -28,6 +28,8 @@
 #include <linux/proc_fs.h>
 #include <linux/security.h>
 #include <linux/list.h>
+#include <linux/jhash.h>
+#include <linux/random.h>
 #include <linux/slab.h>
 #include <net/sock.h>
 #include <net/netfilter/nf_log.h>
@@ -73,6 +75,7 @@ struct nfulnl_instance {
 };
 
 #define INSTANCE_BUCKETS        16
+static unsigned int hash_init;
 
 static int nfnl_log_net_id __read_mostly;
 
@@ -1063,6 +1066,11 @@ static int __init nfnetlink_log_init(void)
 {
         int status = -ENOMEM;
 
+        /* it's not really all that important to have a random value, so
+         * we can do this from the init function, even if there hasn't
+         * been that much entropy yet */
+        get_random_bytes(&hash_init, sizeof(hash_init));
+
         netlink_register_notifier(&nfulnl_rtnl_notifier);
         status = nfnetlink_subsys_register(&nfulnl_subsys);
         if (status < 0) {
diff --git a/net/netfilter/nft_hash.c b/net/netfilter/nft_hash.c
index 6aae699aeb46..3d3f8fce10a5 100644
--- a/net/netfilter/nft_hash.c
+++ b/net/netfilter/nft_hash.c
@@ -164,7 +164,7 @@ static int nft_hash_init(const struct nft_set *set,
         unsigned int cnt, i;
 
         if (unlikely(!nft_hash_rnd_initted)) {
-                nft_hash_rnd = prandom_u32();
+                get_random_bytes(&nft_hash_rnd, 4);
                 nft_hash_rnd_initted = true;
         }
 
diff --git a/net/netfilter/xt_RATEEST.c b/net/netfilter/xt_RATEEST.c
index 190854be7629..370adf622cef 100644
--- a/net/netfilter/xt_RATEEST.c
+++ b/net/netfilter/xt_RATEEST.c
@@ -100,7 +100,7 @@ static int xt_rateest_tg_checkentry(const struct xt_tgchk_param *par)
         int ret;
 
         if (unlikely(!rnd_inited)) {
-                jhash_rnd = prandom_u32();
+                get_random_bytes(&jhash_rnd, sizeof(jhash_rnd));
                 rnd_inited = true;
         }
 
diff --git a/net/netfilter/xt_connlimit.c b/net/netfilter/xt_connlimit.c
index 7671e8214919..c40b2695633b 100644
--- a/net/netfilter/xt_connlimit.c
+++ b/net/netfilter/xt_connlimit.c
@@ -229,7 +229,7 @@ static int connlimit_mt_check(const struct xt_mtchk_param *par)
                 u_int32_t rand;
 
                 do {
-                        rand = prandom_u32();
+                        get_random_bytes(&rand, sizeof(rand));
                 } while (!rand);
                 cmpxchg(&connlimit_rnd, 0, rand);
         }
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index d819f62b3b7c..a3910fc2122b 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -177,7 +177,7 @@ dsthash_alloc_init(struct xt_hashlimit_htable *ht,
         /* initialize hash with random val at the time we allocate
          * the first hashtable entry */
         if (unlikely(!ht->rnd_initialized)) {
-                ht->rnd = prandom_u32();
+                get_random_bytes(&ht->rnd, sizeof(ht->rnd));
                 ht->rnd_initialized = true;
         }
 
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index bfdc29f1a04a..1e657cf715c4 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -334,7 +334,7 @@ static int recent_mt_check(const struct xt_mtchk_param *par,
         size_t sz;
 
         if (unlikely(!hash_rnd_inited)) {
-                hash_rnd = prandom_u32();
+                get_random_bytes(&hash_rnd, sizeof(hash_rnd));
                 hash_rnd_inited = true;
         }
         if (info->check_set & ~XT_RECENT_VALID_FLAGS) {