aboutsummaryrefslogtreecommitdiff
path: root/net/netfilter/xt_recent.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/netfilter/xt_recent.c')
-rw-r--r--net/netfilter/xt_recent.c122
1 files changed, 97 insertions, 25 deletions
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index d2ff15a2412..a9faae89f95 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -29,6 +29,7 @@
#include <linux/skbuff.h>
#include <linux/inet.h>
#include <linux/slab.h>
+#include <linux/vmalloc.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
@@ -75,6 +76,7 @@ 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 +230,10 @@ 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 +263,15 @@ 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;
@@ -306,16 +311,24 @@ out:
return ret;
}
-static int recent_mt_check(const struct xt_mtchk_param *par)
+static void recent_table_free(void *addr)
+{
+ kvfree(addr);
+}
+
+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;
+ kuid_t uid;
+ kgid_t gid;
#endif
- unsigned i;
+ unsigned int i;
int ret = -EINVAL;
+ size_t sz;
if (unlikely(!hash_rnd_inited)) {
get_random_bytes(&hash_rnd, sizeof(hash_rnd));
@@ -354,27 +367,38 @@ static int recent_mt_check(const struct xt_mtchk_param *par)
goto out;
}
- t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size,
- GFP_KERNEL);
+ sz = sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size;
+ if (sz <= PAGE_SIZE)
+ t = kzalloc(sz, GFP_KERNEL);
+ else
+ t = vzalloc(sz);
if (t == NULL) {
ret = -ENOMEM;
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++)
INIT_LIST_HEAD(&t->iphash[i]);
#ifdef CONFIG_PROC_FS
+ uid = make_kuid(&init_user_ns, ip_list_uid);
+ gid = make_kgid(&init_user_ns, ip_list_gid);
+ if (!uid_valid(uid) || !gid_valid(gid)) {
+ recent_table_free(t);
+ ret = -EINVAL;
+ goto out;
+ }
pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent,
&recent_mt_fops, t);
if (pde == NULL) {
- kfree(t);
+ recent_table_free(t);
ret = -ENOMEM;
goto out;
}
- pde->uid = ip_list_uid;
- pde->gid = ip_list_gid;
+ proc_set_user(pde, uid, gid);
#endif
spin_lock_bh(&recent_lock);
list_add_tail(&t->list, &recent_net->tables);
@@ -385,10 +409,28 @@ 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);
@@ -398,10 +440,11 @@ static void recent_mt_destroy(const struct xt_mtdtor_param *par)
list_del(&t->list);
spin_unlock_bh(&recent_lock);
#ifdef CONFIG_PROC_FS
- remove_proc_entry(t->name, recent_net->xt_recent);
+ if (recent_net->xt_recent != NULL)
+ remove_proc_entry(t->name, recent_net->xt_recent);
#endif
recent_table_flush(t);
- kfree(t);
+ recent_table_free(t);
}
mutex_unlock(&recent_mutex);
}
@@ -478,14 +521,13 @@ static const struct seq_operations recent_seq_ops = {
static int recent_seq_open(struct inode *inode, struct file *file)
{
- struct proc_dir_entry *pde = PDE(inode);
struct recent_iter_state *st;
st = __seq_open_private(file, &recent_seq_ops, sizeof(*st));
if (st == NULL)
return -ENOMEM;
- st->table = pde->data;
+ st->table = PDE_DATA(inode);
return 0;
}
@@ -493,8 +535,7 @@ static ssize_t
recent_mt_proc_write(struct file *file, const char __user *input,
size_t size, loff_t *loff)
{
- const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
- struct recent_table *t = pde->data;
+ struct recent_table *t = PDE_DATA(file_inode(file));
struct recent_entry *e;
char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")];
const char *c = buf;
@@ -582,7 +623,21 @@ static int __net_init recent_proc_net_init(struct net *net)
static void __net_exit recent_proc_net_exit(struct net *net)
{
- proc_net_remove(net, "xt_recent");
+ struct recent_net *recent_net = recent_pernet(net);
+ struct recent_table *t;
+
+ /* recent_net_exit() is called before recent_mt_destroy(). Make sure
+ * that the parent xt_recent proc entry is is empty before trying to
+ * remove it.
+ */
+ spin_lock_bh(&recent_lock);
+ list_for_each_entry(t, &recent_net->tables, list)
+ remove_proc_entry(t->name, recent_net->xt_recent);
+
+ recent_net->xt_recent = NULL;
+ spin_unlock_bh(&recent_lock);
+
+ remove_proc_entry("xt_recent", net->proc_net);
}
#else
static inline int recent_proc_net_init(struct net *net)
@@ -605,9 +660,6 @@ static int __net_init recent_net_init(struct net *net)
static void __net_exit recent_net_exit(struct net *net)
{
- struct recent_net *recent_net = recent_pernet(net);
-
- BUG_ON(!list_empty(&recent_net->tables));
recent_proc_net_exit(net);
}
@@ -625,7 +677,7 @@ 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 +687,30 @@ 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)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 08:09:13 +0000