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Message-Id: <1339522563-9227-2-git-send-email-pablo@netfilter.org>
Date: Tue, 12 Jun 2012 19:36:02 +0200
From: pablo@...filter.org
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 1/2] netfilter: xt_HMARK: fix endianness and provide consistent hashing
From: Hans Schillstrom <hans@...illstrom.com>
This patch addresses two issues:
a) Fix usage of u32 and __be32 that causes endianess warnings via sparse.
b) Ensure consistent hashing in a cluster that is composed of big and
little endian systems. Thus, we obtain the same hash mark in an
heterogeneous cluster.
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Hans Schillstrom <hans@...illstrom.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/linux/netfilter/xt_HMARK.h | 5 +++
net/netfilter/xt_HMARK.c | 72 ++++++++++++++++++++----------------
2 files changed, 46 insertions(+), 31 deletions(-)
diff --git a/include/linux/netfilter/xt_HMARK.h b/include/linux/netfilter/xt_HMARK.h
index abb1650..826fc58 100644
--- a/include/linux/netfilter/xt_HMARK.h
+++ b/include/linux/netfilter/xt_HMARK.h
@@ -27,7 +27,12 @@ union hmark_ports {
__u16 src;
__u16 dst;
} p16;
+ struct {
+ __be16 src;
+ __be16 dst;
+ } b16;
__u32 v32;
+ __be32 b32;
};
struct xt_hmark_info {
diff --git a/net/netfilter/xt_HMARK.c b/net/netfilter/xt_HMARK.c
index 0a96a43..1686ca1 100644
--- a/net/netfilter/xt_HMARK.c
+++ b/net/netfilter/xt_HMARK.c
@@ -32,13 +32,13 @@ MODULE_ALIAS("ipt_HMARK");
MODULE_ALIAS("ip6t_HMARK");
struct hmark_tuple {
- u32 src;
- u32 dst;
+ __be32 src;
+ __be32 dst;
union hmark_ports uports;
- uint8_t proto;
+ u8 proto;
};
-static inline u32 hmark_addr6_mask(const __u32 *addr32, const __u32 *mask)
+static inline __be32 hmark_addr6_mask(const __be32 *addr32, const __be32 *mask)
{
return (addr32[0] & mask[0]) ^
(addr32[1] & mask[1]) ^
@@ -46,8 +46,8 @@ static inline u32 hmark_addr6_mask(const __u32 *addr32, const __u32 *mask)
(addr32[3] & mask[3]);
}
-static inline u32
-hmark_addr_mask(int l3num, const __u32 *addr32, const __u32 *mask)
+static inline __be32
+hmark_addr_mask(int l3num, const __be32 *addr32, const __be32 *mask)
{
switch (l3num) {
case AF_INET:
@@ -58,6 +58,22 @@ hmark_addr_mask(int l3num, const __u32 *addr32, const __u32 *mask)
return 0;
}
+static inline void hmark_swap_ports(union hmark_ports *uports,
+ const struct xt_hmark_info *info)
+{
+ union hmark_ports hp;
+ u16 src, dst;
+
+ hp.b32 = (uports->b32 & info->port_mask.b32) | info->port_set.b32;
+ src = ntohs(hp.b16.src);
+ dst = ntohs(hp.b16.dst);
+
+ if (dst > src)
+ uports->v32 = (dst << 16) | src;
+ else
+ uports->v32 = (src << 16) | dst;
+}
+
static int
hmark_ct_set_htuple(const struct sk_buff *skb, struct hmark_tuple *t,
const struct xt_hmark_info *info)
@@ -74,22 +90,19 @@ hmark_ct_set_htuple(const struct sk_buff *skb, struct hmark_tuple *t,
otuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
rtuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
- t->src = hmark_addr_mask(otuple->src.l3num, otuple->src.u3.all,
- info->src_mask.all);
- t->dst = hmark_addr_mask(otuple->src.l3num, rtuple->src.u3.all,
- info->dst_mask.all);
+ t->src = hmark_addr_mask(otuple->src.l3num, otuple->src.u3.ip6,
+ info->src_mask.ip6);
+ t->dst = hmark_addr_mask(otuple->src.l3num, rtuple->src.u3.ip6,
+ info->dst_mask.ip6);
if (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))
return 0;
t->proto = nf_ct_protonum(ct);
if (t->proto != IPPROTO_ICMP) {
- t->uports.p16.src = otuple->src.u.all;
- t->uports.p16.dst = rtuple->src.u.all;
- t->uports.v32 = (t->uports.v32 & info->port_mask.v32) |
- info->port_set.v32;
- if (t->uports.p16.dst < t->uports.p16.src)
- swap(t->uports.p16.dst, t->uports.p16.src);
+ t->uports.b16.src = otuple->src.u.all;
+ t->uports.b16.dst = rtuple->src.u.all;
+ hmark_swap_ports(&t->uports, info);
}
return 0;
@@ -98,15 +111,19 @@ hmark_ct_set_htuple(const struct sk_buff *skb, struct hmark_tuple *t,
#endif
}
+/* This hash function is endian independent, to ensure consistent hashing if
+ * the cluster is composed of big and little endian systems. */
static inline u32
hmark_hash(struct hmark_tuple *t, const struct xt_hmark_info *info)
{
u32 hash;
+ u32 src = ntohl(t->src);
+ u32 dst = ntohl(t->dst);
- if (t->dst < t->src)
- swap(t->src, t->dst);
+ if (dst < src)
+ swap(src, dst);
- hash = jhash_3words(t->src, t->dst, t->uports.v32, info->hashrnd);
+ hash = jhash_3words(src, dst, t->uports.v32, info->hashrnd);
hash = hash ^ (t->proto & info->proto_mask);
return (((u64)hash * info->hmodulus) >> 32) + info->hoffset;
@@ -126,11 +143,7 @@ hmark_set_tuple_ports(const struct sk_buff *skb, unsigned int nhoff,
if (skb_copy_bits(skb, nhoff, &t->uports, sizeof(t->uports)) < 0)
return;
- t->uports.v32 = (t->uports.v32 & info->port_mask.v32) |
- info->port_set.v32;
-
- if (t->uports.p16.dst < t->uports.p16.src)
- swap(t->uports.p16.dst, t->uports.p16.src);
+ hmark_swap_ports(&t->uports, info);
}
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
@@ -178,8 +191,8 @@ hmark_pkt_set_htuple_ipv6(const struct sk_buff *skb, struct hmark_tuple *t,
return -1;
}
noicmp:
- t->src = hmark_addr6_mask(ip6->saddr.s6_addr32, info->src_mask.all);
- t->dst = hmark_addr6_mask(ip6->daddr.s6_addr32, info->dst_mask.all);
+ t->src = hmark_addr6_mask(ip6->saddr.s6_addr32, info->src_mask.ip6);
+ t->dst = hmark_addr6_mask(ip6->daddr.s6_addr32, info->dst_mask.ip6);
if (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))
return 0;
@@ -255,11 +268,8 @@ hmark_pkt_set_htuple_ipv4(const struct sk_buff *skb, struct hmark_tuple *t,
}
}
- t->src = (__force u32) ip->saddr;
- t->dst = (__force u32) ip->daddr;
-
- t->src &= info->src_mask.ip;
- t->dst &= info->dst_mask.ip;
+ t->src = ip->saddr & info->src_mask.ip;
+ t->dst = ip->daddr & info->dst_mask.ip;
if (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))
return 0;
--
1.7.10
--
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