[NETNS][IPV6] ip6_fib - dynamically allocate the fib tables

This patch changes the fib6 tables to be dynamically allocated.  That
provides the ability to make several instances of them when a new
network namespace is created.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 48 insertions, 23 deletions

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index c70fd38b54b7..04d774963f3c 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -166,20 +166,14 @@ static __inline__ void rt6_release(struct rt6_info *rt)
                 dst_free(&rt->u.dst);
 }
 
-static struct fib6_table fib6_main_tbl = {
-        .tb6_id         = RT6_TABLE_MAIN,
-        .tb6_root       = {
-                .leaf           = &ip6_null_entry,
-                .fn_flags       = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO,
-        },
-};
+static struct fib6_table *fib6_main_tbl;
 
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 #define FIB_TABLE_HASHSZ 256
 #else
 #define FIB_TABLE_HASHSZ 1
 #endif
-static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ];
+static struct hlist_head *fib_table_hash;
 
 static void fib6_link_table(struct fib6_table *tb)
 {
@@ -201,13 +195,8 @@ static void fib6_link_table(struct fib6_table *tb)
 }
 
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
-static struct fib6_table fib6_local_tbl = {
-        .tb6_id         = RT6_TABLE_LOCAL,
-        .tb6_root       = {
-                .leaf           = &ip6_null_entry,
-                .fn_flags       = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO,
-        },
-};
+
+static struct fib6_table *fib6_local_tbl;
 
 static struct fib6_table *fib6_alloc_table(u32 id)
 {
@@ -263,8 +252,8 @@ struct fib6_table *fib6_get_table(u32 id)
 
 static void __init fib6_tables_init(void)
 {
-        fib6_link_table(&fib6_main_tbl);
-        fib6_link_table(&fib6_local_tbl);
+        fib6_link_table(fib6_main_tbl);
+        fib6_link_table(fib6_local_tbl);
 }
 
 #else
@@ -276,18 +265,18 @@ struct fib6_table *fib6_new_table(u32 id)
 
 struct fib6_table *fib6_get_table(u32 id)
 {
-        return &fib6_main_tbl;
+        return fib6_main_tbl;
 }
 
 struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
                                    pol_lookup_t lookup)
 {
-        return (struct dst_entry *) lookup(&fib6_main_tbl, fl, flags);
+        return (struct dst_entry *) lookup(fib6_main_tbl, fl, flags);
 }
 
 static void __init fib6_tables_init(void)
 {
-        fib6_link_table(&fib6_main_tbl);
+        fib6_link_table(fib6_main_tbl);
 }
 
 #endif
@@ -1479,22 +1468,53 @@ void fib6_run_gc(unsigned long dummy)
 
 int __init fib6_init(void)
 {
-        int ret;
+        int ret = -ENOMEM;
         fib6_node_kmem = kmem_cache_create("fib6_nodes",
                                            sizeof(struct fib6_node),
                                            0, SLAB_HWCACHE_ALIGN,
                                            NULL);
         if (!fib6_node_kmem)
-                return -ENOMEM;
+                goto out;
+
+        fib_table_hash = kzalloc(sizeof(*fib_table_hash)*FIB_TABLE_HASHSZ,
+                                 GFP_KERNEL);
+        if (!fib_table_hash)
+                goto out_kmem_cache_create;
+
+        fib6_main_tbl = kzalloc(sizeof(*fib6_main_tbl), GFP_KERNEL);
+        if (!fib6_main_tbl)
+                goto out_fib_table_hash;
+
+        fib6_main_tbl->tb6_id = RT6_TABLE_MAIN;
+        fib6_main_tbl->tb6_root.leaf = &ip6_null_entry;
+        fib6_main_tbl->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO;
+
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+        fib6_local_tbl = kzalloc(sizeof(*fib6_local_tbl), GFP_KERNEL);
+        if (!fib6_local_tbl)
+                goto out_fib6_main_tbl;
+
+        fib6_local_tbl->tb6_id = RT6_TABLE_LOCAL;
+        fib6_local_tbl->tb6_root.leaf = &ip6_null_entry;
+        fib6_local_tbl->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO;
+#endif
 
         fib6_tables_init();
 
         ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib);
         if (ret)
-                goto out_kmem_cache_create;
+                goto out_fib6_local_tbl;
 out:
         return ret;
 
+out_fib6_local_tbl:
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+        kfree(fib6_local_tbl);
+out_fib6_main_tbl:
+#endif
+        kfree(fib6_main_tbl);
+out_fib_table_hash:
+        kfree(fib_table_hash);
 out_kmem_cache_create:
         kmem_cache_destroy(fib6_node_kmem);
         goto out;
@@ -1503,5 +1523,10 @@ out_kmem_cache_create:
 void fib6_gc_cleanup(void)
 {
         del_timer(&ip6_fib_timer);
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+        kfree(fib6_local_tbl);
+#endif
+        kfree(fib6_main_tbl);
+        kfree(fib_table_hash);
         kmem_cache_destroy(fib6_node_kmem);
 }