![Jan Engelhardt](/assets/img/avatar_default.png)
Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
696 lines
17 KiB
C
696 lines
17 KiB
C
/*
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* Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
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* Copyright © CC Computer Consultants GmbH, 2007 - 2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This is a replacement of the old ipt_recent module, which carried the
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* following copyright notice:
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*
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* Author: Stephen Frost <sfrost@snowman.net>
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* Copyright 2002-2003, Stephen Frost, 2.5.x port by laforge@netfilter.org
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*/
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#include <linux/init.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/list.h>
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#include <linux/random.h>
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#include <linux/jhash.h>
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#include <linux/bitops.h>
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#include <linux/skbuff.h>
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#include <linux/inet.h>
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#include <net/net_namespace.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_recent.h>
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>");
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MODULE_DESCRIPTION("Xtables: \"recently-seen\" host matching for IPv4");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_recent");
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MODULE_ALIAS("ip6t_recent");
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static unsigned int ip_list_tot = 100;
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static unsigned int ip_pkt_list_tot = 20;
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static unsigned int ip_list_hash_size = 0;
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static unsigned int ip_list_perms = 0644;
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static unsigned int ip_list_uid = 0;
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static unsigned int ip_list_gid = 0;
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module_param(ip_list_tot, uint, 0400);
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module_param(ip_pkt_list_tot, uint, 0400);
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module_param(ip_list_hash_size, uint, 0400);
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module_param(ip_list_perms, uint, 0400);
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module_param(ip_list_uid, uint, 0400);
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module_param(ip_list_gid, uint, 0400);
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MODULE_PARM_DESC(ip_list_tot, "number of IPs to remember per list");
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MODULE_PARM_DESC(ip_pkt_list_tot, "number of packets per IP to remember (max. 255)");
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MODULE_PARM_DESC(ip_list_hash_size, "size of hash table used to look up IPs");
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MODULE_PARM_DESC(ip_list_perms, "permissions on /proc/net/xt_recent/* files");
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MODULE_PARM_DESC(ip_list_uid,"owner of /proc/net/xt_recent/* files");
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MODULE_PARM_DESC(ip_list_gid,"owning group of /proc/net/xt_recent/* files");
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struct recent_entry {
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struct list_head list;
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struct list_head lru_list;
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union nf_inet_addr addr;
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u_int16_t family;
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u_int8_t ttl;
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u_int8_t index;
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u_int16_t nstamps;
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unsigned long stamps[0];
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};
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struct recent_table {
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struct list_head list;
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char name[XT_RECENT_NAME_LEN];
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *proc_old, *proc;
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#endif
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unsigned int refcnt;
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unsigned int entries;
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struct list_head lru_list;
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struct list_head iphash[0];
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};
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static LIST_HEAD(tables);
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static DEFINE_SPINLOCK(recent_lock);
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static DEFINE_MUTEX(recent_mutex);
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#ifdef CONFIG_PROC_FS
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#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
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static struct proc_dir_entry *proc_old_dir;
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#endif
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static struct proc_dir_entry *recent_proc_dir;
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static const struct file_operations recent_old_fops, recent_mt_fops;
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#endif
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static u_int32_t hash_rnd;
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static bool hash_rnd_initted;
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static unsigned int recent_entry_hash4(const union nf_inet_addr *addr)
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{
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if (!hash_rnd_initted) {
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get_random_bytes(&hash_rnd, sizeof(hash_rnd));
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hash_rnd_initted = true;
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}
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return jhash_1word((__force u32)addr->ip, hash_rnd) &
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(ip_list_hash_size - 1);
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}
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static unsigned int recent_entry_hash6(const union nf_inet_addr *addr)
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{
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if (!hash_rnd_initted) {
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get_random_bytes(&hash_rnd, sizeof(hash_rnd));
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hash_rnd_initted = true;
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}
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return jhash2((u32 *)addr->ip6, ARRAY_SIZE(addr->ip6), hash_rnd) &
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(ip_list_hash_size - 1);
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}
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static struct recent_entry *
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recent_entry_lookup(const struct recent_table *table,
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const union nf_inet_addr *addrp, u_int16_t family,
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u_int8_t ttl)
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{
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struct recent_entry *e;
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unsigned int h;
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if (family == NFPROTO_IPV4)
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h = recent_entry_hash4(addrp);
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else
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h = recent_entry_hash6(addrp);
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list_for_each_entry(e, &table->iphash[h], list)
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if (e->family == family &&
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memcmp(&e->addr, addrp, sizeof(e->addr)) == 0 &&
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(ttl == e->ttl || ttl == 0 || e->ttl == 0))
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return e;
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return NULL;
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}
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static void recent_entry_remove(struct recent_table *t, struct recent_entry *e)
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{
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list_del(&e->list);
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list_del(&e->lru_list);
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kfree(e);
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t->entries--;
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}
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static struct recent_entry *
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recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr,
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u_int16_t family, u_int8_t ttl)
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{
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struct recent_entry *e;
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if (t->entries >= ip_list_tot) {
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e = list_entry(t->lru_list.next, struct recent_entry, lru_list);
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recent_entry_remove(t, e);
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}
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e = kmalloc(sizeof(*e) + sizeof(e->stamps[0]) * ip_pkt_list_tot,
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GFP_ATOMIC);
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if (e == NULL)
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return NULL;
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memcpy(&e->addr, addr, sizeof(e->addr));
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e->ttl = ttl;
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e->stamps[0] = jiffies;
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e->nstamps = 1;
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e->index = 1;
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e->family = family;
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if (family == NFPROTO_IPV4)
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list_add_tail(&e->list, &t->iphash[recent_entry_hash4(addr)]);
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else
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list_add_tail(&e->list, &t->iphash[recent_entry_hash6(addr)]);
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list_add_tail(&e->lru_list, &t->lru_list);
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t->entries++;
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return e;
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}
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static void recent_entry_update(struct recent_table *t, struct recent_entry *e)
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{
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e->stamps[e->index++] = jiffies;
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if (e->index > e->nstamps)
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e->nstamps = e->index;
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e->index %= ip_pkt_list_tot;
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list_move_tail(&e->lru_list, &t->lru_list);
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}
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static struct recent_table *recent_table_lookup(const char *name)
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{
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struct recent_table *t;
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list_for_each_entry(t, &tables, list)
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if (!strcmp(t->name, name))
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return t;
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return NULL;
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}
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static void recent_table_flush(struct recent_table *t)
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{
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struct recent_entry *e, *next;
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unsigned int i;
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for (i = 0; i < ip_list_hash_size; i++)
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list_for_each_entry_safe(e, next, &t->iphash[i], list)
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recent_entry_remove(t, e);
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}
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static bool
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recent_mt(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const struct xt_match *match,
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const void *matchinfo, int offset, unsigned int protoff,
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bool *hotdrop)
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{
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const struct xt_recent_mtinfo *info = matchinfo;
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struct recent_table *t;
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struct recent_entry *e;
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union nf_inet_addr addr = {};
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u_int8_t ttl;
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bool ret = info->invert;
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if (match->family == NFPROTO_IPV4) {
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const struct iphdr *iph = ip_hdr(skb);
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if (info->side == XT_RECENT_DEST)
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addr.ip = iph->daddr;
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else
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addr.ip = iph->saddr;
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ttl = iph->ttl;
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} else {
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const struct ipv6hdr *iph = ipv6_hdr(skb);
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if (info->side == XT_RECENT_DEST)
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memcpy(&addr.in6, &iph->daddr, sizeof(addr.in6));
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else
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memcpy(&addr.in6, &iph->saddr, sizeof(addr.in6));
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ttl = iph->hop_limit;
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}
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/* use TTL as seen before forwarding */
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if (out && !skb->sk)
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ttl++;
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spin_lock_bh(&recent_lock);
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t = recent_table_lookup(info->name);
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e = recent_entry_lookup(t, &addr, match->family,
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(info->check_set & XT_RECENT_TTL) ? ttl : 0);
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if (e == NULL) {
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if (!(info->check_set & XT_RECENT_SET))
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goto out;
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e = recent_entry_init(t, &addr, match->family, ttl);
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if (e == NULL)
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*hotdrop = true;
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ret = !ret;
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goto out;
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}
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if (info->check_set & XT_RECENT_SET)
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ret = !ret;
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else if (info->check_set & XT_RECENT_REMOVE) {
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recent_entry_remove(t, e);
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ret = !ret;
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} else if (info->check_set & (XT_RECENT_CHECK | XT_RECENT_UPDATE)) {
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unsigned long time = jiffies - info->seconds * HZ;
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unsigned int i, hits = 0;
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for (i = 0; i < e->nstamps; i++) {
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if (info->seconds && time_after(time, e->stamps[i]))
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continue;
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if (++hits >= info->hit_count) {
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ret = !ret;
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break;
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}
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}
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}
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if (info->check_set & XT_RECENT_SET ||
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(info->check_set & XT_RECENT_UPDATE && ret)) {
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recent_entry_update(t, e);
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e->ttl = ttl;
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}
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out:
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spin_unlock_bh(&recent_lock);
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return ret;
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}
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static bool
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recent_mt_check(const char *tablename, const void *ip,
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const struct xt_match *match, void *matchinfo,
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unsigned int hook_mask)
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{
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const struct xt_recent_mtinfo *info = matchinfo;
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struct recent_table *t;
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unsigned i;
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bool ret = false;
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if (hweight8(info->check_set &
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(XT_RECENT_SET | XT_RECENT_REMOVE |
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XT_RECENT_CHECK | XT_RECENT_UPDATE)) != 1)
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return false;
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if ((info->check_set & (XT_RECENT_SET | XT_RECENT_REMOVE)) &&
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(info->seconds || info->hit_count))
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return false;
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if (info->hit_count > ip_pkt_list_tot)
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return false;
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if (info->name[0] == '\0' ||
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strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN)
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return false;
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mutex_lock(&recent_mutex);
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t = recent_table_lookup(info->name);
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if (t != NULL) {
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t->refcnt++;
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ret = true;
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goto out;
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}
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t = kzalloc(sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size,
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GFP_KERNEL);
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if (t == NULL)
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goto out;
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t->refcnt = 1;
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strcpy(t->name, info->name);
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INIT_LIST_HEAD(&t->lru_list);
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for (i = 0; i < ip_list_hash_size; i++)
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INIT_LIST_HEAD(&t->iphash[i]);
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#ifdef CONFIG_PROC_FS
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t->proc = proc_create(t->name, ip_list_perms, recent_proc_dir,
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&recent_mt_fops);
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if (t->proc == NULL) {
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kfree(t);
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goto out;
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}
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#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
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t->proc_old = proc_create(t->name, ip_list_perms, proc_old_dir,
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&recent_old_fops);
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if (t->proc_old == NULL) {
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remove_proc_entry(t->name, proc_old_dir);
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kfree(t);
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goto out;
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}
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t->proc_old->uid = ip_list_uid;
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t->proc_old->gid = ip_list_gid;
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t->proc_old->data = t;
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#endif
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t->proc->uid = ip_list_uid;
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t->proc->gid = ip_list_gid;
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t->proc->data = t;
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#endif
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spin_lock_bh(&recent_lock);
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list_add_tail(&t->list, &tables);
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spin_unlock_bh(&recent_lock);
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ret = true;
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out:
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mutex_unlock(&recent_mutex);
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return ret;
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}
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static void recent_mt_destroy(const struct xt_match *match, void *matchinfo)
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{
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const struct xt_recent_mtinfo *info = matchinfo;
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struct recent_table *t;
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mutex_lock(&recent_mutex);
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t = recent_table_lookup(info->name);
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if (--t->refcnt == 0) {
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spin_lock_bh(&recent_lock);
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list_del(&t->list);
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spin_unlock_bh(&recent_lock);
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#ifdef CONFIG_PROC_FS
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#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
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remove_proc_entry(t->name, proc_old_dir);
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#endif
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remove_proc_entry(t->name, recent_proc_dir);
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#endif
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recent_table_flush(t);
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kfree(t);
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}
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mutex_unlock(&recent_mutex);
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}
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#ifdef CONFIG_PROC_FS
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struct recent_iter_state {
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const struct recent_table *table;
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unsigned int bucket;
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};
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static void *recent_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(recent_lock)
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{
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struct recent_iter_state *st = seq->private;
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const struct recent_table *t = st->table;
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struct recent_entry *e;
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loff_t p = *pos;
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spin_lock_bh(&recent_lock);
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for (st->bucket = 0; st->bucket < ip_list_hash_size; st->bucket++)
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list_for_each_entry(e, &t->iphash[st->bucket], list)
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if (p-- == 0)
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return e;
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return NULL;
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}
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static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct recent_iter_state *st = seq->private;
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const struct recent_table *t = st->table;
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const struct recent_entry *e = v;
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const struct list_head *head = e->list.next;
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while (head == &t->iphash[st->bucket]) {
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if (++st->bucket >= ip_list_hash_size)
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return NULL;
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head = t->iphash[st->bucket].next;
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}
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(*pos)++;
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return list_entry(head, struct recent_entry, list);
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}
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static void recent_seq_stop(struct seq_file *s, void *v)
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__releases(recent_lock)
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{
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spin_unlock_bh(&recent_lock);
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}
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static int recent_seq_show(struct seq_file *seq, void *v)
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{
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const struct recent_entry *e = v;
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unsigned int i;
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i = (e->index - 1) % ip_pkt_list_tot;
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if (e->family == NFPROTO_IPV4)
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seq_printf(seq, "src=" NIPQUAD_FMT " ttl: %u last_seen: %lu "
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"oldest_pkt: %u", NIPQUAD(e->addr.ip), e->ttl,
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e->stamps[i], e->index);
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else
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seq_printf(seq, "src=" NIP6_FMT " ttl: %u last_seen: %lu "
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"oldest_pkt: %u", NIP6(e->addr.in6), e->ttl,
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e->stamps[i], e->index);
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for (i = 0; i < e->nstamps; i++)
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seq_printf(seq, "%s %lu", i ? "," : "", e->stamps[i]);
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seq_printf(seq, "\n");
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return 0;
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}
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static const struct seq_operations recent_seq_ops = {
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.start = recent_seq_start,
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.next = recent_seq_next,
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.stop = recent_seq_stop,
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.show = recent_seq_show,
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};
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static int recent_seq_open(struct inode *inode, struct file *file)
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{
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struct proc_dir_entry *pde = PDE(inode);
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struct recent_iter_state *st;
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st = __seq_open_private(file, &recent_seq_ops, sizeof(*st));
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if (st == NULL)
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return -ENOMEM;
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st->table = pde->data;
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return 0;
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}
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#ifdef CONFIG_NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
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static int recent_old_seq_open(struct inode *inode, struct file *filp)
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{
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static bool warned_of_old;
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if (unlikely(!warned_of_old)) {
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printk(KERN_INFO KBUILD_MODNAME ": Use of /proc/net/ipt_recent"
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" is deprecated; use /proc/net/xt_recent.\n");
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warned_of_old = true;
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}
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return recent_seq_open(inode, filp);
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}
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static ssize_t recent_old_proc_write(struct file *file,
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const char __user *input,
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size_t size, loff_t *loff)
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{
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const struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
|
|
struct recent_table *t = pde->data;
|
|
struct recent_entry *e;
|
|
char buf[sizeof("+255.255.255.255")], *c = buf;
|
|
__be32 addr;
|
|
int add;
|
|
|
|
if (size > sizeof(buf))
|
|
size = sizeof(buf);
|
|
if (copy_from_user(buf, input, size))
|
|
return -EFAULT;
|
|
|
|
while (isspace(*c))
|
|
c++;
|
|
|
|
if (size - (c - buf) < 5)
|
|
return c - buf;
|
|
if (!strncmp(c, "clear", 5)) {
|
|
c += 5;
|
|
spin_lock_bh(&recent_lock);
|
|
recent_table_flush(t);
|
|
spin_unlock_bh(&recent_lock);
|
|
return c - buf;
|
|
}
|
|
|
|
switch (*c) {
|
|
case '-':
|
|
add = 0;
|
|
c++;
|
|
break;
|
|
case '+':
|
|
c++;
|
|
default:
|
|
add = 1;
|
|
break;
|
|
}
|
|
addr = in_aton(c);
|
|
|
|
spin_lock_bh(&recent_lock);
|
|
e = recent_entry_lookup(t, (const void *)&addr, NFPROTO_IPV4, 0);
|
|
if (e == NULL) {
|
|
if (add)
|
|
recent_entry_init(t, (const void *)&addr,
|
|
NFPROTO_IPV4, 0);
|
|
} else {
|
|
if (add)
|
|
recent_entry_update(t, e);
|
|
else
|
|
recent_entry_remove(t, e);
|
|
}
|
|
spin_unlock_bh(&recent_lock);
|
|
return size;
|
|
}
|
|
|
|
static const struct file_operations recent_old_fops = {
|
|
.open = recent_old_seq_open,
|
|
.read = seq_read,
|
|
.write = recent_old_proc_write,
|
|
.release = seq_release_private,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
#endif
|
|
|
|
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_entry *e;
|
|
char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")];
|
|
const char *c = buf;
|
|
union nf_inet_addr addr;
|
|
u_int16_t family;
|
|
bool add, succ;
|
|
|
|
if (size == 0)
|
|
return 0;
|
|
if (size > sizeof(buf))
|
|
size = sizeof(buf);
|
|
if (copy_from_user(buf, input, size) != 0)
|
|
return -EFAULT;
|
|
|
|
/* Strict protocol! */
|
|
if (*loff != 0)
|
|
return -ESPIPE;
|
|
switch (*c) {
|
|
case '/': /* flush table */
|
|
spin_lock_bh(&recent_lock);
|
|
recent_table_flush(t);
|
|
spin_unlock_bh(&recent_lock);
|
|
return size;
|
|
case '-': /* remove address */
|
|
add = false;
|
|
break;
|
|
case '+': /* add address */
|
|
add = true;
|
|
break;
|
|
default:
|
|
printk(KERN_INFO KBUILD_MODNAME ": Need +ip, -ip or /\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
++c;
|
|
--size;
|
|
if (strnchr(c, size, ':') != NULL) {
|
|
family = NFPROTO_IPV6;
|
|
succ = in6_pton(c, size, (void *)&addr, '\n', NULL);
|
|
} else {
|
|
family = NFPROTO_IPV4;
|
|
succ = in4_pton(c, size, (void *)&addr, '\n', NULL);
|
|
}
|
|
|
|
if (!succ) {
|
|
printk(KERN_INFO KBUILD_MODNAME ": illegal address written "
|
|
"to procfs\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_bh(&recent_lock);
|
|
e = recent_entry_lookup(t, &addr, family, 0);
|
|
if (e == NULL) {
|
|
if (add)
|
|
recent_entry_init(t, &addr, family, 0);
|
|
} else {
|
|
if (add)
|
|
recent_entry_update(t, e);
|
|
else
|
|
recent_entry_remove(t, e);
|
|
}
|
|
spin_unlock_bh(&recent_lock);
|
|
/* Note we removed one above */
|
|
*loff += size + 1;
|
|
return size + 1;
|
|
}
|
|
|
|
static const struct file_operations recent_mt_fops = {
|
|
.open = recent_seq_open,
|
|
.read = seq_read,
|
|
.write = recent_mt_proc_write,
|
|
.release = seq_release_private,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
static struct xt_match recent_mt_reg[] __read_mostly = {
|
|
{
|
|
.name = "recent",
|
|
.revision = 0,
|
|
.family = NFPROTO_IPV4,
|
|
.match = recent_mt,
|
|
.matchsize = sizeof(struct xt_recent_mtinfo),
|
|
.checkentry = recent_mt_check,
|
|
.destroy = recent_mt_destroy,
|
|
.me = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "recent",
|
|
.revision = 0,
|
|
.family = NFPROTO_IPV6,
|
|
.match = recent_mt,
|
|
.matchsize = sizeof(struct xt_recent_mtinfo),
|
|
.checkentry = recent_mt_check,
|
|
.destroy = recent_mt_destroy,
|
|
.me = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init recent_mt_init(void)
|
|
{
|
|
int err;
|
|
|
|
if (!ip_list_tot || !ip_pkt_list_tot || ip_pkt_list_tot > 255)
|
|
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
|
|
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
|
|
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
|
|
}
|
|
|
|
module_init(recent_mt_init);
|
|
module_exit(recent_mt_exit);
|