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netfilter: xt_recent: IPv6 support
This updates xt_recent to support the IPv6 address family. The new /proc/net/xt_recent directory must be used for this. The old proc interface can also be configured out. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Jan Engelhardt
Patrick McHardy
parent
e948b20a71
commit
079aa88fe7
3 changed files with 256 additions and 54 deletions
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@ -250,6 +250,9 @@ What (Why):
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- xt_mark match revision 0
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(superseded by xt_mark match revision 1)
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- xt_recent: the old ipt_recent proc dir
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(superseded by /proc/net/xt_recent)
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When: January 2009 or Linux 2.7.0, whichever comes first
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Why: Superseded by newer revisions or modules
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Who: Jan Engelhardt <jengelh@computergmbh.de>
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@ -743,6 +743,13 @@ config NETFILTER_XT_MATCH_RECENT
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Short options are available by using 'iptables -m recent -h'
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Official Website: <http://snowman.net/projects/ipt_recent/>
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config NETFILTER_XT_MATCH_RECENT_PROC_COMPAT
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bool 'Enable obsolete /proc/net/ipt_recent'
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depends on NETFILTER_XT_MATCH_RECENT && PROC_FS
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---help---
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This option enables the old /proc/net/ipt_recent interface,
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which has been obsoleted by /proc/net/xt_recent.
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config NETFILTER_XT_MATCH_SCTP
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tristate '"sctp" protocol match support (EXPERIMENTAL)'
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depends on NETFILTER_XTABLES && EXPERIMENTAL
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@ -1,5 +1,6 @@
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/*
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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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@ -13,6 +14,8 @@
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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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@ -30,9 +33,11 @@
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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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@ -49,14 +54,15 @@ 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/ipt_recent/* files");
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MODULE_PARM_DESC(ip_list_uid,"owner of /proc/net/ipt_recent/* files");
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MODULE_PARM_DESC(ip_list_gid,"owning group of /proc/net/ipt_recent/* files");
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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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__be32 addr;
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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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@ -67,7 +73,7 @@ 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;
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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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@ -80,31 +86,53 @@ 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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static struct proc_dir_entry *proc_dir;
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static const struct file_operations recent_fops;
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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 int hash_rnd_initted;
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static bool hash_rnd_initted;
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static unsigned int recent_entry_hash(__be32 addr)
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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, 4);
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hash_rnd_initted = 1;
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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, hash_rnd) & (ip_list_hash_size - 1);
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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, __be32 addr, u_int8_t ttl)
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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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h = recent_entry_hash(addr);
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if (family == AF_INET)
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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->addr == addr && (ttl == e->ttl || !ttl || !e->ttl))
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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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@ -118,7 +146,8 @@ static void recent_entry_remove(struct recent_table *t, struct recent_entry *e)
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}
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static struct recent_entry *
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recent_entry_init(struct recent_table *t, __be32 addr, u_int8_t ttl)
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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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@ -130,12 +159,16 @@ recent_entry_init(struct recent_table *t, __be32 addr, u_int8_t ttl)
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GFP_ATOMIC);
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if (e == NULL)
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return NULL;
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e->addr = addr;
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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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list_add_tail(&e->list, &t->iphash[recent_entry_hash(addr)]);
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e->family = family;
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if (family == AF_INET)
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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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@ -179,28 +212,42 @@ recent_mt(const struct sk_buff *skb, const struct net_device *in,
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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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__be32 addr;
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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 (info->side == XT_RECENT_DEST)
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addr = ip_hdr(skb)->daddr;
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else
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addr = ip_hdr(skb)->saddr;
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if (match->family == AF_INET) {
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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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ttl = ip_hdr(skb)->ttl;
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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,
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info->check_set & XT_RECENT_TTL ? ttl : 0);
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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, ttl);
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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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@ -277,11 +324,24 @@ recent_mt_check(const char *tablename, const void *ip,
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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, proc_dir, &recent_fops);
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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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@ -307,7 +367,10 @@ static void recent_mt_destroy(const struct xt_match *match, void *matchinfo)
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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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remove_proc_entry(t->name, proc_dir);
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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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@ -317,7 +380,7 @@ static void recent_mt_destroy(const struct xt_match *match, void *matchinfo)
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#ifdef CONFIG_PROC_FS
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struct recent_iter_state {
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struct recent_table *table;
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const struct recent_table *table;
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unsigned int bucket;
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};
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@ -342,8 +405,8 @@ 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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struct recent_entry *e = v;
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struct list_head *head = e->list.next;
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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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@ -366,8 +429,14 @@ static int recent_seq_show(struct seq_file *seq, void *v)
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unsigned int i;
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i = (e->index - 1) % ip_pkt_list_tot;
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seq_printf(seq, "src=%u.%u.%u.%u ttl: %u last_seen: %lu oldest_pkt: %u",
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NIPQUAD(e->addr), e->ttl, e->stamps[i], e->index);
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if (e->family == AF_INET)
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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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@ -394,8 +463,22 @@ static int recent_seq_open(struct inode *inode, struct file *file)
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return 0;
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}
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static ssize_t recent_proc_write(struct file *file, const char __user *input,
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size_t size, loff_t *loff)
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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);
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struct recent_table *t = pde->data;
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@ -408,6 +491,7 @@ static ssize_t recent_proc_write(struct file *file, const char __user *input,
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size = sizeof(buf);
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if (copy_from_user(buf, input, size))
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return -EFAULT;
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while (isspace(*c))
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c++;
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@ -435,10 +519,10 @@ static ssize_t recent_proc_write(struct file *file, const char __user *input,
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addr = in_aton(c);
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spin_lock_bh(&recent_lock);
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e = recent_entry_lookup(t, addr, 0);
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e = recent_entry_lookup(t, (const void *)&addr, PF_INET, 0);
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if (e == NULL) {
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if (add)
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recent_entry_init(t, addr, 0);
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recent_entry_init(t, (const void *)&addr, PF_INET, 0);
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} else {
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if (add)
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recent_entry_update(t, e);
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@ -449,23 +533,118 @@ static ssize_t recent_proc_write(struct file *file, const char __user *input,
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return size;
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}
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static const struct file_operations recent_fops = {
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.open = recent_seq_open,
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static const struct file_operations recent_old_fops = {
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.open = recent_old_seq_open,
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.read = seq_read,
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.write = recent_proc_write,
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.write = recent_old_proc_write,
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.release = seq_release_private,
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.owner = THIS_MODULE,
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};
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#endif
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static ssize_t
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recent_mt_proc_write(struct file *file, 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);
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struct recent_table *t = pde->data;
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struct recent_entry *e;
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char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")];
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const char *c = buf;
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union nf_inet_addr addr;
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u_int16_t family;
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bool add, succ;
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if (size == 0)
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return 0;
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if (size > sizeof(buf))
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size = sizeof(buf);
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if (copy_from_user(buf, input, size) != 0)
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return -EFAULT;
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/* Strict protocol! */
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if (*loff != 0)
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return -ESPIPE;
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switch (*c) {
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case '/': /* flush table */
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spin_lock_bh(&recent_lock);
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recent_table_flush(t);
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spin_unlock_bh(&recent_lock);
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return size;
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case '-': /* remove address */
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add = false;
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break;
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case '+': /* add address */
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add = true;
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break;
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default:
|
||||
printk(KERN_INFO KBUILD_MODNAME ": Need +ip, -ip or /\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
++c;
|
||||
--size;
|
||||
if (strnchr(c, size, ':') != NULL) {
|
||||
family = AF_INET6;
|
||||
succ = in6_pton(c, size, (void *)&addr, '\n', NULL);
|
||||
} else {
|
||||
family = AF_INET;
|
||||
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",
|
||||
.family = AF_INET,
|
||||
.match = recent_mt,
|
||||
.matchsize = sizeof(struct xt_recent_mtinfo),
|
||||
.checkentry = recent_mt_check,
|
||||
.destroy = recent_mt_destroy,
|
||||
.me = THIS_MODULE,
|
||||
static struct xt_match recent_mt_reg[] __read_mostly = {
|
||||
{
|
||||
.name = "recent",
|
||||
.revision = 0,
|
||||
.family = AF_INET,
|
||||
.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 = AF_INET6,
|
||||
.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)
|
||||
|
|
@ -476,15 +655,25 @@ static int __init recent_mt_init(void)
|
|||
return -EINVAL;
|
||||
ip_list_hash_size = 1 << fls(ip_list_tot);
|
||||
|
||||
err = xt_register_match(&recent_mt_reg);
|
||||
err = xt_register_matches(recent_mt_reg, ARRAY_SIZE(recent_mt_reg));
|
||||
#ifdef CONFIG_PROC_FS
|
||||
if (err)
|
||||
return err;
|
||||
proc_dir = proc_mkdir("ipt_recent", init_net.proc_net);
|
||||
if (proc_dir == NULL) {
|
||||
xt_unregister_match(&recent_mt_reg);
|
||||
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;
|
||||
}
|
||||
|
|
@ -492,9 +681,12 @@ static int __init recent_mt_init(void)
|
|||
static void __exit recent_mt_exit(void)
|
||||
{
|
||||
BUG_ON(!list_empty(&tables));
|
||||
xt_unregister_match(&recent_mt_reg);
|
||||
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
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue