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-rw-r--r--Documentation/feature-removal-schedule.txt7
-rw-r--r--include/linux/netfilter.h10
-rw-r--r--include/linux/netfilter/xt_recent.h10
-rw-r--r--net/netfilter/xt_recent.c62
4 files changed, 80 insertions, 9 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 24ac00f..bc4b9c6 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -574,6 +574,13 @@ Why: Remount currently allows changing bound subsystems and
----------------------------
+What: xt_recent rev 0
+When: 2013
+Who: Pablo Neira Ayuso <pablo@netfilter.org>
+Files: net/netfilter/xt_recent.c
+
+----------------------------
+
What: KVM debugfs statistics
When: 2013
Why: KVM tracepoints provide mostly equivalent information in a much more
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index ff9c84c..4541f33 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -94,6 +94,16 @@ static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
a1->all[3] == a2->all[3];
}
+static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
+ union nf_inet_addr *result,
+ const union nf_inet_addr *mask)
+{
+ result->all[0] = a1->all[0] & mask->all[0];
+ result->all[1] = a1->all[1] & mask->all[1];
+ result->all[2] = a1->all[2] & mask->all[2];
+ result->all[3] = a1->all[3] & mask->all[3];
+}
+
extern void netfilter_init(void);
/* Largest hook number + 1 */
diff --git a/include/linux/netfilter/xt_recent.h b/include/linux/netfilter/xt_recent.h
index 83318e0..6ef36c1 100644
--- a/include/linux/netfilter/xt_recent.h
+++ b/include/linux/netfilter/xt_recent.h
@@ -32,4 +32,14 @@ struct xt_recent_mtinfo {
__u8 side;
};
+struct xt_recent_mtinfo_v1 {
+ __u32 seconds;
+ __u32 hit_count;
+ __u8 check_set;
+ __u8 invert;
+ char name[XT_RECENT_NAME_LEN];
+ __u8 side;
+ union nf_inet_addr mask;
+};
+
#endif /* _LINUX_NETFILTER_XT_RECENT_H */
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index fc0d6db..ae2ad1e 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -75,6 +75,7 @@ struct recent_entry {
struct recent_table {
struct list_head list;
char name[XT_RECENT_NAME_LEN];
+ union nf_inet_addr mask;
unsigned int refcnt;
unsigned int entries;
struct list_head lru_list;
@@ -228,10 +229,10 @@ recent_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
struct net *net = dev_net(par->in ? par->in : par->out);
struct recent_net *recent_net = recent_pernet(net);
- const struct xt_recent_mtinfo *info = par->matchinfo;
+ const struct xt_recent_mtinfo_v1 *info = par->matchinfo;
struct recent_table *t;
struct recent_entry *e;
- union nf_inet_addr addr = {};
+ union nf_inet_addr addr = {}, addr_mask;
u_int8_t ttl;
bool ret = info->invert;
@@ -261,12 +262,15 @@ recent_mt(const struct sk_buff *skb, struct xt_action_param *par)
spin_lock_bh(&recent_lock);
t = recent_table_lookup(recent_net, info->name);
- e = recent_entry_lookup(t, &addr, par->family,
+
+ nf_inet_addr_mask(&addr, &addr_mask, &t->mask);
+
+ e = recent_entry_lookup(t, &addr_mask, par->family,
(info->check_set & XT_RECENT_TTL) ? ttl : 0);
if (e == NULL) {
if (!(info->check_set & XT_RECENT_SET))
goto out;
- e = recent_entry_init(t, &addr, par->family, ttl);
+ e = recent_entry_init(t, &addr_mask, par->family, ttl);
if (e == NULL)
par->hotdrop = true;
ret = !ret;
@@ -306,10 +310,10 @@ out:
return ret;
}
-static int recent_mt_check(const struct xt_mtchk_param *par)
+static int recent_mt_check(const struct xt_mtchk_param *par,
+ const struct xt_recent_mtinfo_v1 *info)
{
struct recent_net *recent_net = recent_pernet(par->net);
- const struct xt_recent_mtinfo *info = par->matchinfo;
struct recent_table *t;
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *pde;
@@ -361,6 +365,8 @@ static int recent_mt_check(const struct xt_mtchk_param *par)
goto out;
}
t->refcnt = 1;
+
+ memcpy(&t->mask, &info->mask, sizeof(t->mask));
strcpy(t->name, info->name);
INIT_LIST_HEAD(&t->lru_list);
for (i = 0; i < ip_list_hash_size; i++)
@@ -385,10 +391,28 @@ out:
return ret;
}
+static int recent_mt_check_v0(const struct xt_mtchk_param *par)
+{
+ const struct xt_recent_mtinfo_v0 *info_v0 = par->matchinfo;
+ struct xt_recent_mtinfo_v1 info_v1;
+
+ /* Copy revision 0 structure to revision 1 */
+ memcpy(&info_v1, info_v0, sizeof(struct xt_recent_mtinfo));
+ /* Set default mask to ensure backward compatible behaviour */
+ memset(info_v1.mask.all, 0xFF, sizeof(info_v1.mask.all));
+
+ return recent_mt_check(par, &info_v1);
+}
+
+static int recent_mt_check_v1(const struct xt_mtchk_param *par)
+{
+ return recent_mt_check(par, par->matchinfo);
+}
+
static void recent_mt_destroy(const struct xt_mtdtor_param *par)
{
struct recent_net *recent_net = recent_pernet(par->net);
- const struct xt_recent_mtinfo *info = par->matchinfo;
+ const struct xt_recent_mtinfo_v1 *info = par->matchinfo;
struct recent_table *t;
mutex_lock(&recent_mutex);
@@ -625,7 +649,7 @@ static struct xt_match recent_mt_reg[] __read_mostly = {
.family = NFPROTO_IPV4,
.match = recent_mt,
.matchsize = sizeof(struct xt_recent_mtinfo),
- .checkentry = recent_mt_check,
+ .checkentry = recent_mt_check_v0,
.destroy = recent_mt_destroy,
.me = THIS_MODULE,
},
@@ -635,10 +659,30 @@ static struct xt_match recent_mt_reg[] __read_mostly = {
.family = NFPROTO_IPV6,
.match = recent_mt,
.matchsize = sizeof(struct xt_recent_mtinfo),
- .checkentry = recent_mt_check,
+ .checkentry = recent_mt_check_v0,
+ .destroy = recent_mt_destroy,
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "recent",
+ .revision = 1,
+ .family = NFPROTO_IPV4,
+ .match = recent_mt,
+ .matchsize = sizeof(struct xt_recent_mtinfo_v1),
+ .checkentry = recent_mt_check_v1,
.destroy = recent_mt_destroy,
.me = THIS_MODULE,
},
+ {
+ .name = "recent",
+ .revision = 1,
+ .family = NFPROTO_IPV6,
+ .match = recent_mt,
+ .matchsize = sizeof(struct xt_recent_mtinfo_v1),
+ .checkentry = recent_mt_check_v1,
+ .destroy = recent_mt_destroy,
+ .me = THIS_MODULE,
+ }
};
static int __init recent_mt_init(void)
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