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Diffstat (limited to 'net/netfilter/xt_recent.c')
-rw-r--r--net/netfilter/xt_recent.c168
1 files changed, 111 insertions, 57 deletions
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index fc70a49c0afd..7073dbb8100c 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -28,6 +28,7 @@
#include <linux/skbuff.h>
#include <linux/inet.h>
#include <net/net_namespace.h>
+#include <net/netns/generic.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_recent.h>
@@ -52,7 +53,7 @@ module_param(ip_list_perms, uint, 0400);
module_param(ip_list_uid, uint, 0400);
module_param(ip_list_gid, uint, 0400);
MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list");
-MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP to remember (max. 255)");
+MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP address to remember (max. 255)");
MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs");
MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files");
MODULE_PARM_DESC(ip_list_uid,"owner of /proc/net/xt_recent/* files");
@@ -78,37 +79,40 @@ struct recent_table {
struct list_head iphash[0];
};
-static LIST_HEAD(tables);
+struct recent_net {
+ struct list_head tables;
+#ifdef CONFIG_PROC_FS
+ struct proc_dir_entry *xt_recent;
+#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
+ struct proc_dir_entry *ipt_recent;
+#endif
+#endif
+};
+
+static int recent_net_id;
+static inline struct recent_net *recent_pernet(struct net *net)
+{
+ return net_generic(net, recent_net_id);
+}
+
static DEFINE_SPINLOCK(recent_lock);
static DEFINE_MUTEX(recent_mutex);
#ifdef CONFIG_PROC_FS
-#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
-static struct proc_dir_entry *proc_old_dir;
-#endif
-static struct proc_dir_entry *recent_proc_dir;
static const struct file_operations recent_old_fops, recent_mt_fops;
#endif
-static u_int32_t hash_rnd;
-static bool hash_rnd_initted;
+static u_int32_t hash_rnd __read_mostly;
+static bool hash_rnd_inited __read_mostly;
-static unsigned int recent_entry_hash4(const union nf_inet_addr *addr)
+static inline unsigned int recent_entry_hash4(const union nf_inet_addr *addr)
{
- if (!hash_rnd_initted) {
- get_random_bytes(&hash_rnd, sizeof(hash_rnd));
- hash_rnd_initted = true;
- }
return jhash_1word((__force u32)addr->ip, hash_rnd) &
(ip_list_hash_size - 1);
}
-static unsigned int recent_entry_hash6(const union nf_inet_addr *addr)
+static inline unsigned int recent_entry_hash6(const union nf_inet_addr *addr)
{
- if (!hash_rnd_initted) {
- get_random_bytes(&hash_rnd, sizeof(hash_rnd));
- hash_rnd_initted = true;
- }
return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) &
(ip_list_hash_size - 1);
}
@@ -173,18 +177,19 @@ recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr,
static void recent_entry_update(struct recent_table *t, struct recent_entry *e)
{
+ e->index %= ip_pkt_list_tot;
e->stamps[e->index++] = jiffies;
if (e->index > e->nstamps)
e->nstamps = e->index;
- e->index %= ip_pkt_list_tot;
list_move_tail(&e->lru_list, &t->lru_list);
}
-static struct recent_table *recent_table_lookup(const char *name)
+static struct recent_table *recent_table_lookup(struct recent_net *recent_net,
+ const char *name)
{
struct recent_table *t;
- list_for_each_entry(t, &tables, list)
+ list_for_each_entry(t, &recent_net->tables, list)
if (!strcmp(t->name, name))
return t;
return NULL;
@@ -203,6 +208,8 @@ static void recent_table_flush(struct recent_table *t)
static bool
recent_mt(const struct sk_buff *skb, const struct xt_match_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;
struct recent_table *t;
struct recent_entry *e;
@@ -235,7 +242,7 @@ recent_mt(const struct sk_buff *skb, const struct xt_match_param *par)
ttl++;
spin_lock_bh(&recent_lock);
- t = recent_table_lookup(info->name);
+ t = recent_table_lookup(recent_net, info->name);
e = recent_entry_lookup(t, &addr, par->match->family,
(info->check_set & XT_RECENT_TTL) ? ttl : 0);
if (e == NULL) {
@@ -260,7 +267,7 @@ recent_mt(const struct sk_buff *skb, const struct xt_match_param *par)
for (i = 0; i < e->nstamps; i++) {
if (info->seconds && time_after(time, e->stamps[i]))
continue;
- if (++hits >= info->hit_count) {
+ if (info->hit_count && ++hits >= info->hit_count) {
ret = !ret;
break;
}
@@ -279,6 +286,7 @@ out:
static bool recent_mt_check(const struct xt_mtchk_param *par)
{
+ 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
@@ -287,6 +295,10 @@ static bool recent_mt_check(const struct xt_mtchk_param *par)
unsigned i;
bool ret = false;
+ if (unlikely(!hash_rnd_inited)) {
+ get_random_bytes(&hash_rnd, sizeof(hash_rnd));
+ hash_rnd_inited = true;
+ }
if (hweight8(info->check_set &
(XT_RECENT_SET | XT_RECENT_REMOVE |
XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1)
@@ -294,14 +306,18 @@ static bool recent_mt_check(const struct xt_mtchk_param *par)
if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) &&
(info->seconds || info->hit_count))
return false;
- if (info->hit_count > ip_pkt_list_tot)
+ if (info->hit_count > ip_pkt_list_tot) {
+ pr_info(KBUILD_MODNAME ": hitcount (%u) is larger than "
+ "packets to be remembered (%u)\n",
+ info->hit_count, ip_pkt_list_tot);
return false;
+ }
if (info->name[0] == '\0' ||
strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN)
return false;
mutex_lock(&recent_mutex);
- t = recent_table_lookup(info->name);
+ t = recent_table_lookup(recent_net, info->name);
if (t != NULL) {
t->refcnt++;
ret = true;
@@ -318,7 +334,7 @@ static bool recent_mt_check(const struct xt_mtchk_param *par)
for (i = 0; i < ip_list_hash_size; i++)
INIT_LIST_HEAD(&t->iphash[i]);
#ifdef CONFIG_PROC_FS
- pde = proc_create_data(t->name, ip_list_perms, recent_proc_dir,
+ pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent,
&recent_mt_fops, t);
if (pde == NULL) {
kfree(t);
@@ -327,10 +343,10 @@ static bool recent_mt_check(const struct xt_mtchk_param *par)
pde->uid = ip_list_uid;
pde->gid = ip_list_gid;
#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
- pde = proc_create_data(t->name, ip_list_perms, proc_old_dir,
+ pde = proc_create_data(t->name, ip_list_perms, recent_net->ipt_recent,
&recent_old_fops, t);
if (pde == NULL) {
- remove_proc_entry(t->name, proc_old_dir);
+ remove_proc_entry(t->name, recent_net->xt_recent);
kfree(t);
goto out;
}
@@ -339,7 +355,7 @@ static bool recent_mt_check(const struct xt_mtchk_param *par)
#endif
#endif
spin_lock_bh(&recent_lock);
- list_add_tail(&t->list, &tables);
+ list_add_tail(&t->list, &recent_net->tables);
spin_unlock_bh(&recent_lock);
ret = true;
out:
@@ -349,20 +365,21 @@ out:
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;
struct recent_table *t;
mutex_lock(&recent_mutex);
- t = recent_table_lookup(info->name);
+ t = recent_table_lookup(recent_net, info->name);
if (--t->refcnt == 0) {
spin_lock_bh(&recent_lock);
list_del(&t->list);
spin_unlock_bh(&recent_lock);
#ifdef CONFIG_PROC_FS
#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
- remove_proc_entry(t->name, proc_old_dir);
+ remove_proc_entry(t->name, recent_net->ipt_recent);
#endif
- remove_proc_entry(t->name, recent_proc_dir);
+ remove_proc_entry(t->name, recent_net->xt_recent);
#endif
recent_table_flush(t);
kfree(t);
@@ -611,8 +628,65 @@ static const struct file_operations recent_mt_fops = {
.release = seq_release_private,
.owner = THIS_MODULE,
};
+
+static int __net_init recent_proc_net_init(struct net *net)
+{
+ struct recent_net *recent_net = recent_pernet(net);
+
+ recent_net->xt_recent = proc_mkdir("xt_recent", net->proc_net);
+ if (!recent_net->xt_recent)
+ return -ENOMEM;
+#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
+ recent_net->ipt_recent = proc_mkdir("ipt_recent", net->proc_net);
+ if (!recent_net->ipt_recent) {
+ proc_net_remove(net, "xt_recent");
+ return -ENOMEM;
+ }
+#endif
+ return 0;
+}
+
+static void __net_exit recent_proc_net_exit(struct net *net)
+{
+#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
+ proc_net_remove(net, "ipt_recent");
+#endif
+ proc_net_remove(net, "xt_recent");
+}
+#else
+static inline int recent_proc_net_init(struct net *net)
+{
+ return 0;
+}
+
+static inline void recent_proc_net_exit(struct net *net)
+{
+}
#endif /* CONFIG_PROC_FS */
+static int __net_init recent_net_init(struct net *net)
+{
+ struct recent_net *recent_net = recent_pernet(net);
+
+ INIT_LIST_HEAD(&recent_net->tables);
+ return recent_proc_net_init(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);
+}
+
+static struct pernet_operations recent_net_ops = {
+ .init = recent_net_init,
+ .exit = recent_net_exit,
+ .id = &recent_net_id,
+ .size = sizeof(struct recent_net),
+};
+
static struct xt_match recent_mt_reg[] __read_mostly = {
{
.name = "recent",
@@ -644,39 +718,19 @@ static int __init recent_mt_init(void)
return -EINVAL;
ip_list_hash_size = 1 << fls(ip_list_tot);
- err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
-#ifdef CONFIG_PROC_FS
+ err = register_pernet_subsys(&recent_net_ops);
if (err)
return err;
- recent_proc_dir = proc_mkdir("xt_recent", init_net.proc_net);
- if (recent_proc_dir == NULL) {
- xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
- err = -ENOMEM;
- }
-#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
- if (err < 0)
- return err;
- proc_old_dir = proc_mkdir("ipt_recent", init_net.proc_net);
- if (proc_old_dir == NULL) {
- remove_proc_entry("xt_recent", init_net.proc_net);
- xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
- err = -ENOMEM;
- }
-#endif
-#endif
+ err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
+ if (err)
+ unregister_pernet_subsys(&recent_net_ops);
return err;
}
static void __exit recent_mt_exit(void)
{
- BUG_ON(!list_empty(&tables));
xt_unregister_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
-#ifdef CONFIG_PROC_FS
-#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
- remove_proc_entry("ipt_recent", init_net.proc_net);
-#endif
- remove_proc_entry("xt_recent", init_net.proc_net);
-#endif
+ unregister_pernet_subsys(&recent_net_ops);
}
module_init(recent_mt_init);
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-11 12:04:36 +0000