static int __net_init fib4_rules_init(struct net *net)
{
struct fib_table *local_table, *main_table;
//分别为LOCAL和MAIN分配fib_table..
local_table = fib_hash_table(RT_TABLE_LOCAL);
if (local_table == NULL)
return -ENOMEM;
main_table = fib_hash_table(RT_TABLE_MAIN);
if (main_table == NULL)
goto fail;
//fib_table_hash为调用该函数时候分配的一个hash数组..也是只有2个数组项...
//因此就是把fib_table分别添加到对应的hlist上..
hlist_add_head_rcu(&local_table->tb_hlist, &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
hlist_add_head_rcu(&main_table->tb_hlist, &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
return 0;
fail:
kfree(local_table);
return -ENOMEM;
}
static int __net_init fib4_rules_init(struct net *net)
{
struct fib_table *local_table, *main_table;
local_table = fib_hash_table(RT_TABLE_LOCAL);
if (local_table == NULL)
return -ENOMEM;
main_table = fib_hash_table(RT_TABLE_MAIN);
if (main_table == NULL)
goto fail;
hlist_add_head_rcu(&local_table->tb_hlist,
&net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
hlist_add_head_rcu(&main_table->tb_hlist,
&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
return 0;
fail:
kfree(local_table);
return -ENOMEM;
}
struct fib_table *fib_new_table(struct net *net, u32 id)
{
struct fib_table *tb;
unsigned int h;
if (id == 0)
id = RT_TABLE_MAIN;
tb = fib_get_table(net, id);
if (tb)
return tb;
tb = fib_hash_table(id);
if (!tb)
return NULL;
h = id & (FIB_TABLE_HASHSZ - 1);
hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
return tb;
}
