From: Florian Westphal <fw@xxxxxxxxx>
Instead of passing mask to all the helpers, just fixup the search key
early.
After rbtree conversion, each rbtree node stores connections of same
'addr & mask', so no need to pass the mask too.
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/netfilter/xt_connlimit.c | 52 +++++++++++++++++---------------------------
1 file changed, 20 insertions(+), 32 deletions(-)
diff --git a/net/netfilter/xt_connlimit.c b/net/netfilter/xt_connlimit.c
index ce2870428631..a6214f235333 100644
--- a/net/netfilter/xt_connlimit.c
+++ b/net/netfilter/xt_connlimit.c
@@ -71,16 +71,9 @@ static inline unsigned int connlimit_iphash(__be32 addr)
}
static inline unsigned int
-connlimit_iphash6(const union nf_inet_addr *addr,
- const union nf_inet_addr *mask)
+connlimit_iphash6(const union nf_inet_addr *addr)
{
- union nf_inet_addr res;
- unsigned int i;
-
- for (i = 0; i < ARRAY_SIZE(addr->ip6); ++i)
- res.ip6[i] = addr->ip6[i] & mask->ip6[i];
-
- return jhash2((u32 *)res.ip6, ARRAY_SIZE(res.ip6),
+ return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6),
connlimit_rnd) % CONNLIMIT_SLOTS;
}
@@ -94,24 +87,13 @@ static inline bool already_closed(const struct nf_conn *conn)
}
static int
-same_source_net(const union nf_inet_addr *addr,
- const union nf_inet_addr *mask,
- const union nf_inet_addr *u3, u_int8_t family)
+same_source(const union nf_inet_addr *addr,
+ const union nf_inet_addr *u3, u_int8_t family)
{
- if (family == NFPROTO_IPV4) {
- return ntohl(addr->ip & mask->ip) -
- ntohl(u3->ip & mask->ip);
- } else {
- union nf_inet_addr lh, rh;
- unsigned int i;
-
- for (i = 0; i < ARRAY_SIZE(addr->ip6); ++i) {
- lh.ip6[i] = addr->ip6[i] & mask->ip6[i];
- rh.ip6[i] = u3->ip6[i] & mask->ip6[i];
- }
+ if (family == NFPROTO_IPV4)
+ return ntohl(addr->ip) - ntohl(u3->ip);
- return memcmp(&lh.ip6, &rh.ip6, sizeof(lh.ip6));
- }
+ return memcmp(addr->ip6, u3->ip6, sizeof(addr->ip6));
}
static bool add_hlist(struct hlist_head *head,
@@ -194,7 +176,7 @@ static void tree_nodes_free(struct rb_root *root,
static unsigned int
count_tree(struct net *net, struct rb_root *root,
const struct nf_conntrack_tuple *tuple,
- const union nf_inet_addr *addr, const union nf_inet_addr *mask,
+ const union nf_inet_addr *addr,
u8 family, const struct nf_conntrack_zone *zone)
{
struct xt_connlimit_rb *gc_nodes[CONNLIMIT_GC_MAX_NODES];
@@ -215,7 +197,7 @@ count_tree(struct net *net, struct rb_root *root,
rbconn = rb_entry(*rbnode, struct xt_connlimit_rb, node);
parent = *rbnode;
- diff = same_source_net(addr, mask, &rbconn->addr, family);
+ diff = same_source(addr, &rbconn->addr, family);
if (diff < 0) {
rbnode = &((*rbnode)->rb_left);
} else if (diff > 0) {
@@ -282,7 +264,6 @@ static int count_them(struct net *net,
struct xt_connlimit_data *data,
const struct nf_conntrack_tuple *tuple,
const union nf_inet_addr *addr,
- const union nf_inet_addr *mask,
u_int8_t family,
const struct nf_conntrack_zone *zone)
{
@@ -291,14 +272,14 @@ static int count_them(struct net *net,
u32 hash;
if (family == NFPROTO_IPV6)
- hash = connlimit_iphash6(addr, mask);
+ hash = connlimit_iphash6(addr);
else
- hash = connlimit_iphash(addr->ip & mask->ip);
+ hash = connlimit_iphash(addr->ip);
root = &data->climit_root[hash];
spin_lock_bh(&xt_connlimit_locks[hash % CONNLIMIT_LOCK_SLOTS]);
- count = count_tree(net, root, tuple, addr, mask, family, zone);
+ count = count_tree(net, root, tuple, addr, family, zone);
spin_unlock_bh(&xt_connlimit_locks[hash % CONNLIMIT_LOCK_SLOTS]);
@@ -329,16 +310,23 @@ connlimit_mt(const struct sk_buff *skb, struct xt_action_param *par)
if (xt_family(par) == NFPROTO_IPV6) {
const struct ipv6hdr *iph = ipv6_hdr(skb);
+ unsigned int i;
+
memcpy(&addr.ip6, (info->flags & XT_CONNLIMIT_DADDR) ?
&iph->daddr : &iph->saddr, sizeof(addr.ip6));
+
+ for (i = 0; i < ARRAY_SIZE(addr.ip6); ++i)
+ addr.ip6[i] &= info->mask.ip6[i];
} else {
const struct iphdr *iph = ip_hdr(skb);
addr.ip = (info->flags & XT_CONNLIMIT_DADDR) ?
iph->daddr : iph->saddr;
+
+ addr.ip &= info->mask.ip;
}
connections = count_them(net, info->data, tuple_ptr, &addr,
- &info->mask, xt_family(par), zone);
+ xt_family(par), zone);
if (connections == 0)
/* kmalloc failed, drop it entirely */
goto hotdrop;
--
2.11.0
--
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