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Date: Wed, 3 Dec 2014 13:55:38 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 08/12] netfilter: ipset: Alignment problem between 64bit kernel 32bit userspace
From: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
Sven-Haegar Koch reported the issue:
sims:~# iptables -A OUTPUT -m set --match-set testset src -j ACCEPT
iptables: Invalid argument. Run `dmesg' for more information.
In syslog:
x_tables: ip_tables: set.3 match: invalid size 48 (kernel) != (user) 32
which was introduced by the counter extension in ipset.
The patch fixes the alignment issue with introducing a new set match
revision with the fixed underlying 'struct ip_set_counter_match'
structure.
Signed-off-by: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/uapi/linux/netfilter/ipset/ip_set.h | 8 ++-
include/uapi/linux/netfilter/xt_set.h | 13 ++++-
net/netfilter/xt_set.c | 73 +++++++++++++++++++++++++--
3 files changed, 88 insertions(+), 6 deletions(-)
diff --git a/include/uapi/linux/netfilter/ipset/ip_set.h b/include/uapi/linux/netfilter/ipset/ip_set.h
index ca03119..5ab4e60 100644
--- a/include/uapi/linux/netfilter/ipset/ip_set.h
+++ b/include/uapi/linux/netfilter/ipset/ip_set.h
@@ -256,11 +256,17 @@ enum {
IPSET_COUNTER_GT,
};
-struct ip_set_counter_match {
+/* Backward compatibility for set match v3 */
+struct ip_set_counter_match0 {
__u8 op;
__u64 value;
};
+struct ip_set_counter_match {
+ __aligned_u64 value;
+ __u8 op;
+};
+
/* Interface to iptables/ip6tables */
#define SO_IP_SET 83
diff --git a/include/uapi/linux/netfilter/xt_set.h b/include/uapi/linux/netfilter/xt_set.h
index d6a1df1..d4e0234 100644
--- a/include/uapi/linux/netfilter/xt_set.h
+++ b/include/uapi/linux/netfilter/xt_set.h
@@ -66,8 +66,8 @@ struct xt_set_info_target_v2 {
struct xt_set_info_match_v3 {
struct xt_set_info match_set;
- struct ip_set_counter_match packets;
- struct ip_set_counter_match bytes;
+ struct ip_set_counter_match0 packets;
+ struct ip_set_counter_match0 bytes;
__u32 flags;
};
@@ -81,4 +81,13 @@ struct xt_set_info_target_v3 {
__u32 timeout;
};
+/* Revision 4 match */
+
+struct xt_set_info_match_v4 {
+ struct xt_set_info match_set;
+ struct ip_set_counter_match packets;
+ struct ip_set_counter_match bytes;
+ __u32 flags;
+};
+
#endif /*_XT_SET_H*/
diff --git a/net/netfilter/xt_set.c b/net/netfilter/xt_set.c
index 5732cd6..0d47afe 100644
--- a/net/netfilter/xt_set.c
+++ b/net/netfilter/xt_set.c
@@ -157,7 +157,7 @@ set_match_v1_destroy(const struct xt_mtdtor_param *par)
/* Revision 3 match */
static bool
-match_counter(u64 counter, const struct ip_set_counter_match *info)
+match_counter0(u64 counter, const struct ip_set_counter_match0 *info)
{
switch (info->op) {
case IPSET_COUNTER_NONE:
@@ -192,14 +192,60 @@ set_match_v3(const struct sk_buff *skb, struct xt_action_param *par)
if (!(ret && opt.cmdflags & IPSET_FLAG_MATCH_COUNTERS))
return ret;
- if (!match_counter(opt.ext.packets, &info->packets))
+ if (!match_counter0(opt.ext.packets, &info->packets))
return 0;
- return match_counter(opt.ext.bytes, &info->bytes);
+ return match_counter0(opt.ext.bytes, &info->bytes);
}
#define set_match_v3_checkentry set_match_v1_checkentry
#define set_match_v3_destroy set_match_v1_destroy
+/* Revision 4 match */
+
+static bool
+match_counter(u64 counter, const struct ip_set_counter_match *info)
+{
+ switch (info->op) {
+ case IPSET_COUNTER_NONE:
+ return true;
+ case IPSET_COUNTER_EQ:
+ return counter == info->value;
+ case IPSET_COUNTER_NE:
+ return counter != info->value;
+ case IPSET_COUNTER_LT:
+ return counter < info->value;
+ case IPSET_COUNTER_GT:
+ return counter > info->value;
+ }
+ return false;
+}
+
+static bool
+set_match_v4(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct xt_set_info_match_v4 *info = par->matchinfo;
+ ADT_OPT(opt, par->family, info->match_set.dim,
+ info->match_set.flags, info->flags, UINT_MAX);
+ int ret;
+
+ if (info->packets.op != IPSET_COUNTER_NONE ||
+ info->bytes.op != IPSET_COUNTER_NONE)
+ opt.cmdflags |= IPSET_FLAG_MATCH_COUNTERS;
+
+ ret = match_set(info->match_set.index, skb, par, &opt,
+ info->match_set.flags & IPSET_INV_MATCH);
+
+ if (!(ret && opt.cmdflags & IPSET_FLAG_MATCH_COUNTERS))
+ return ret;
+
+ if (!match_counter(opt.ext.packets, &info->packets))
+ return 0;
+ return match_counter(opt.ext.bytes, &info->bytes);
+}
+
+#define set_match_v4_checkentry set_match_v1_checkentry
+#define set_match_v4_destroy set_match_v1_destroy
+
/* Revision 0 interface: backward compatible with netfilter/iptables */
static unsigned int
@@ -573,6 +619,27 @@ static struct xt_match set_matches[] __read_mostly = {
.destroy = set_match_v3_destroy,
.me = THIS_MODULE
},
+ /* new revision for counters support: update, match */
+ {
+ .name = "set",
+ .family = NFPROTO_IPV4,
+ .revision = 4,
+ .match = set_match_v4,
+ .matchsize = sizeof(struct xt_set_info_match_v4),
+ .checkentry = set_match_v4_checkentry,
+ .destroy = set_match_v4_destroy,
+ .me = THIS_MODULE
+ },
+ {
+ .name = "set",
+ .family = NFPROTO_IPV6,
+ .revision = 4,
+ .match = set_match_v4,
+ .matchsize = sizeof(struct xt_set_info_match_v4),
+ .checkentry = set_match_v4_checkentry,
+ .destroy = set_match_v4_destroy,
+ .me = THIS_MODULE
+ },
};
static struct xt_target set_targets[] __read_mostly = {
--
1.7.10.4
--
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