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netfilter: connlimit: move insertion of new element out of count function 

Allows easier code-reuse in followup patches.

Reviewed-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2014-03-07 14:37:11 +01:00 committed by Pablo Neira Ayuso
parent d9ec4f1ee2
commit 3bcc5fdf1b
1 changed files with 23 additions and 15 deletions
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38
net/netfilter/xt_connlimit.c
View File

@ -97,13 +97,12 @@ static int count_hlist(struct net *net,
const struct nf_conntrack_tuple *tuple,
const union nf_inet_addr *addr,
const union nf_inet_addr *mask,
u_int8_t family)
u_int8_t family, bool *addit)
{
const struct nf_conntrack_tuple_hash *found;
struct xt_connlimit_conn *conn;
struct hlist_node *n;
struct nf_conn *found_ct;
bool addit = true;
int matches = 0;
rcu_read_lock();
@ -126,7 +125,7 @@ static int count_hlist(struct net *net,
* We should not see tuples twice unless someone hooks
* this into a table without "-p tcp --syn".
*/
addit = false;
*addit = false;
} else if (already_closed(found_ct)) {
/*
* we do not care about connections which are
@ -146,20 +145,22 @@ static int count_hlist(struct net *net,
rcu_read_unlock();
if (addit) {
/* save the new connection in our list */
conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
if (conn == NULL)
return -ENOMEM;
conn->tuple = *tuple;
conn->addr = *addr;
hlist_add_head(&conn->node, head);
++matches;
}
return matches;
}
static bool add_hlist(struct hlist_head *head,
const struct nf_conntrack_tuple *tuple,
const union nf_inet_addr *addr)
{
struct xt_connlimit_conn *conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
if (conn == NULL)
return false;
conn->tuple = *tuple;
conn->addr = *addr;
hlist_add_head(&conn->node, head);
return true;
}
static int count_them(struct net *net,
struct xt_connlimit_data *data,
const struct nf_conntrack_tuple *tuple,
@ -170,6 +171,7 @@ static int count_them(struct net *net,
struct hlist_head *hhead;
int count;
u32 hash;
bool addit = true;
if (family == NFPROTO_IPV6)
hash = connlimit_iphash6(addr, mask);
@ -179,7 +181,13 @@ static int count_them(struct net *net,
hhead = &data->iphash[hash];
spin_lock_bh(&data->lock);
count = count_hlist(net, hhead, tuple, addr, mask, family);
count = count_hlist(net, hhead, tuple, addr, mask, family, &addit);
if (addit) {
if (add_hlist(hhead, tuple, addr))
count++;
else
count = -ENOMEM;
}
spin_unlock_bh(&data->lock);
return count;