diff options
| -rw-r--r-- | net/netfilter/xt_hashlimit.c | 141 |
1 files changed, 98 insertions, 43 deletions
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c index 944fd11c8989..fb7fcb773a3f 100644 --- a/net/netfilter/xt_hashlimit.c +++ b/net/netfilter/xt_hashlimit.c @@ -26,6 +26,7 @@ #endif #include <net/net_namespace.h> +#include <net/netns/generic.h> #include <linux/netfilter/x_tables.h> #include <linux/netfilter_ipv4/ip_tables.h> @@ -40,9 +41,19 @@ MODULE_DESCRIPTION("Xtables: per hash-bucket rate-limit match"); MODULE_ALIAS("ipt_hashlimit"); MODULE_ALIAS("ip6t_hashlimit"); +struct hashlimit_net { + struct hlist_head htables; + struct proc_dir_entry *ipt_hashlimit; + struct proc_dir_entry *ip6t_hashlimit; +}; + +static int hashlimit_net_id; +static inline struct hashlimit_net *hashlimit_pernet(struct net *net) +{ + return net_generic(net, hashlimit_net_id); +} + /* need to declare this at the top */ -static struct proc_dir_entry *hashlimit_procdir4; -static struct proc_dir_entry *hashlimit_procdir6; static const struct file_operations dl_file_ops; /* hash table crap */ @@ -93,13 +104,13 @@ struct xt_hashlimit_htable { /* seq_file stuff */ struct proc_dir_entry *pde; + struct net *net; struct hlist_head hash[0]; /* hashtable itself */ }; static DEFINE_SPINLOCK(hashlimit_lock); /* protects htables list */ static DEFINE_MUTEX(hlimit_mutex); /* additional checkentry protection */ -static HLIST_HEAD(hashlimit_htables); static struct kmem_cache *hashlimit_cachep __read_mostly; static inline bool dst_cmp(const struct dsthash_ent *ent, @@ -185,8 +196,9 @@ dsthash_free(struct xt_hashlimit_htable *ht, struct dsthash_ent *ent) } static void htable_gc(unsigned long htlong); -static int htable_create_v0(struct xt_hashlimit_info *minfo, u_int8_t family) +static int htable_create_v0(struct net *net, struct xt_hashlimit_info *minfo, u_int8_t family) { + struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); struct xt_hashlimit_htable *hinfo; unsigned int size; unsigned int i; @@ -239,26 +251,29 @@ static int htable_create_v0(struct xt_hashlimit_info *minfo, u_int8_t family) spin_lock_init(&hinfo->lock); hinfo->pde = proc_create_data(minfo->name, 0, (family == NFPROTO_IPV4) ? - hashlimit_procdir4 : hashlimit_procdir6, + hashlimit_net->ipt_hashlimit : hashlimit_net->ip6t_hashlimit, &dl_file_ops, hinfo); if (!hinfo->pde) { vfree(hinfo); return -1; } + hinfo->net = net; setup_timer(&hinfo->timer, htable_gc, (unsigned long )hinfo); hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval); add_timer(&hinfo->timer); spin_lock_bh(&hashlimit_lock); - hlist_add_head(&hinfo->node, &hashlimit_htables); + hlist_add_head(&hinfo->node, &hashlimit_net->htables); spin_unlock_bh(&hashlimit_lock); return 0; } -static int htable_create(struct xt_hashlimit_mtinfo1 *minfo, u_int8_t family) +static int htable_create(struct net *net, struct xt_hashlimit_mtinfo1 *minfo, + u_int8_t family) { + struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); struct xt_hashlimit_htable *hinfo; unsigned int size; unsigned int i; @@ -301,19 +316,20 @@ static int htable_create(struct xt_hashlimit_mtinfo1 *minfo, u_int8_t family) hinfo->pde = proc_create_data(minfo->name, 0, (family == NFPROTO_IPV4) ? - hashlimit_procdir4 : hashlimit_procdir6, + hashlimit_net->ipt_hashlimit : hashlimit_net->ip6t_hashlimit, &dl_file_ops, hinfo); if (hinfo->pde == NULL) { vfree(hinfo); return -1; } + hinfo->net = net; setup_timer(&hinfo->timer, htable_gc, (unsigned long)hinfo); hinfo->timer.expires = jiffies + msecs_to_jiffies(hinfo->cfg.gc_interval); add_timer(&hinfo->timer); spin_lock_bh(&hashlimit_lock); - hlist_add_head(&hinfo->node, &hashlimit_htables); + hlist_add_head(&hinfo->node, &hashlimit_net->htables); spin_unlock_bh(&hashlimit_lock); return 0; @@ -364,24 +380,30 @@ static void htable_gc(unsigned long htlong) static void htable_destroy(struct xt_hashlimit_htable *hinfo) { + struct hashlimit_net *hashlimit_net = hashlimit_pernet(hinfo->net); + struct proc_dir_entry *parent; + del_timer_sync(&hinfo->timer); - /* remove proc entry */ - remove_proc_entry(hinfo->pde->name, - hinfo->family == NFPROTO_IPV4 ? hashlimit_procdir4 : - hashlimit_procdir6); + if (hinfo->family == NFPROTO_IPV4) + parent = hashlimit_net->ipt_hashlimit; + else + parent = hashlimit_net->ip6t_hashlimit; + remove_proc_entry(hinfo->pde->name, parent); htable_selective_cleanup(hinfo, select_all); vfree(hinfo); } -static struct xt_hashlimit_htable *htable_find_get(const char *name, +static struct xt_hashlimit_htable *htable_find_get(struct net *net, + const char *name, u_int8_t family) { + struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); struct xt_hashlimit_htable *hinfo; struct hlist_node *pos; spin_lock_bh(&hashlimit_lock); - hlist_for_each_entry(hinfo, pos, &hashlimit_htables, node) { + hlist_for_each_entry(hinfo, pos, &hashlimit_net->htables, node) { if (!strcmp(name, hinfo->pde->name) && hinfo->family == family) { atomic_inc(&hinfo->use); @@ -665,6 +687,7 @@ hashlimit_mt(const struct sk_buff *skb, const struct xt_match_param *par) static bool hashlimit_mt_check_v0(const struct xt_mtchk_param *par) { + struct net *net = par->net; struct xt_hashlimit_info *r = par->matchinfo; /* Check for overflow. */ @@ -694,8 +717,8 @@ static bool hashlimit_mt_check_v0(const struct xt_mtchk_param *par) * the list of htable's in htable_create(), since then we would * create duplicate proc files. -HW */ mutex_lock(&hlimit_mutex); - r->hinfo = htable_find_get(r->name, par->match->family); - if (!r->hinfo && htable_create_v0(r, par->match->family) != 0) { + r->hinfo = htable_find_get(net, r->name, par->match->family); + if (!r->hinfo && htable_create_v0(net, r, par->match->family) != 0) { mutex_unlock(&hlimit_mutex); return false; } @@ -706,6 +729,7 @@ static bool hashlimit_mt_check_v0(const struct xt_mtchk_param *par) static bool hashlimit_mt_check(const struct xt_mtchk_param *par) { + struct net *net = par->net; struct xt_hashlimit_mtinfo1 *info = par->matchinfo; /* Check for overflow. */ @@ -735,8 +759,8 @@ static bool hashlimit_mt_check(const struct xt_mtchk_param *par) * the list of htable's in htable_create(), since then we would * create duplicate proc files. -HW */ mutex_lock(&hlimit_mutex); - info->hinfo = htable_find_get(info->name, par->match->family); - if (!info->hinfo && htable_create(info, par->match->family) != 0) { + info->hinfo = htable_find_get(net, info->name, par->match->family); + if (!info->hinfo && htable_create(net, info, par->match->family) != 0) { mutex_unlock(&hlimit_mutex); return false; } @@ -953,10 +977,61 @@ static const struct file_operations dl_file_ops = { .release = seq_release }; +static int __net_init hashlimit_proc_net_init(struct net *net) +{ + struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); + + hashlimit_net->ipt_hashlimit = proc_mkdir("ipt_hashlimit", net->proc_net); + if (!hashlimit_net->ipt_hashlimit) + return -ENOMEM; +#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) + hashlimit_net->ip6t_hashlimit = proc_mkdir("ip6t_hashlimit", net->proc_net); + if (!hashlimit_net->ip6t_hashlimit) { + proc_net_remove(net, "ipt_hashlimit"); + return -ENOMEM; + } +#endif + return 0; +} + +static void __net_exit hashlimit_proc_net_exit(struct net *net) +{ + proc_net_remove(net, "ipt_hashlimit"); +#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) + proc_net_remove(net, "ip6t_hashlimit"); +#endif +} + +static int __net_init hashlimit_net_init(struct net *net) +{ + struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); + + INIT_HLIST_HEAD(&hashlimit_net->htables); + return hashlimit_proc_net_init(net); +} + +static void __net_exit hashlimit_net_exit(struct net *net) +{ + struct hashlimit_net *hashlimit_net = hashlimit_pernet(net); + + BUG_ON(!hlist_empty(&hashlimit_net->htables)); + hashlimit_proc_net_exit(net); +} + +static struct pernet_operations hashlimit_net_ops = { + .init = hashlimit_net_init, + .exit = hashlimit_net_exit, + .id = &hashlimit_net_id, + .size = sizeof(struct hashlimit_net), +}; + static int __init hashlimit_mt_init(void) { int err; + err = register_pernet_subsys(&hashlimit_net_ops); + if (err < 0) + return err; err = xt_register_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg)); if (err < 0) @@ -970,41 +1045,21 @@ static int __init hashlimit_mt_init(void) printk(KERN_ERR "xt_hashlimit: unable to create slab cache\n"); goto err2; } - hashlimit_procdir4 = proc_mkdir("ipt_hashlimit", init_net.proc_net); - if (!hashlimit_procdir4) { - printk(KERN_ERR "xt_hashlimit: unable to create proc dir " - "entry\n"); - goto err3; - } - err = 0; -#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) - hashlimit_procdir6 = proc_mkdir("ip6t_hashlimit", init_net.proc_net); - if (!hashlimit_procdir6) { - printk(KERN_ERR "xt_hashlimit: unable to create proc dir " - "entry\n"); - err = -ENOMEM; - } -#endif - if (!err) - return 0; - remove_proc_entry("ipt_hashlimit", init_net.proc_net); -err3: - kmem_cache_destroy(hashlimit_cachep); + return 0; + err2: xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg)); err1: + unregister_pernet_subsys(&hashlimit_net_ops); return err; } static void __exit hashlimit_mt_exit(void) { - remove_proc_entry("ipt_hashlimit", init_net.proc_net); -#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) - remove_proc_entry("ip6t_hashlimit", init_net.proc_net); -#endif kmem_cache_destroy(hashlimit_cachep); xt_unregister_matches(hashlimit_mt_reg, ARRAY_SIZE(hashlimit_mt_reg)); + unregister_pernet_subsys(&hashlimit_net_ops); } module_init(hashlimit_mt_init); |