diff options
Diffstat (limited to 'net/ipv4/netfilter/ipt_conntrack.c')
-rw-r--r-- | net/ipv4/netfilter/ipt_conntrack.c | 232 |
1 files changed, 0 insertions, 232 deletions
diff --git a/net/ipv4/netfilter/ipt_conntrack.c b/net/ipv4/netfilter/ipt_conntrack.c deleted file mode 100644 index c8d18705469b..000000000000 --- a/net/ipv4/netfilter/ipt_conntrack.c +++ /dev/null @@ -1,232 +0,0 @@ -/* Kernel module to match connection tracking information. - * Superset of Rusty's minimalistic state match. - * - * (C) 2001 Marc Boucher (marc@mbsi.ca). - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/module.h> -#include <linux/skbuff.h> - -#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) -#include <linux/netfilter_ipv4/ip_conntrack.h> -#include <linux/netfilter_ipv4/ip_conntrack_tuple.h> -#else -#include <net/netfilter/nf_conntrack.h> -#endif - -#include <linux/netfilter_ipv4/ip_tables.h> -#include <linux/netfilter_ipv4/ipt_conntrack.h> - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); -MODULE_DESCRIPTION("iptables connection tracking match module"); - -#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) - -static int -match(const struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - const void *matchinfo, - int offset, - int *hotdrop) -{ - const struct ipt_conntrack_info *sinfo = matchinfo; - struct ip_conntrack *ct; - enum ip_conntrack_info ctinfo; - unsigned int statebit; - - ct = ip_conntrack_get((struct sk_buff *)skb, &ctinfo); - -#define FWINV(bool,invflg) ((bool) ^ !!(sinfo->invflags & invflg)) - - if (ct == &ip_conntrack_untracked) - statebit = IPT_CONNTRACK_STATE_UNTRACKED; - else if (ct) - statebit = IPT_CONNTRACK_STATE_BIT(ctinfo); - else - statebit = IPT_CONNTRACK_STATE_INVALID; - - if(sinfo->flags & IPT_CONNTRACK_STATE) { - if (ct) { - if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip != - ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip) - statebit |= IPT_CONNTRACK_STATE_SNAT; - - if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip != - ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip) - statebit |= IPT_CONNTRACK_STATE_DNAT; - } - - if (FWINV((statebit & sinfo->statemask) == 0, IPT_CONNTRACK_STATE)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_PROTO) { - if (!ct || FWINV(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum, IPT_CONNTRACK_PROTO)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_ORIGSRC) { - if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip&sinfo->sipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip, IPT_CONNTRACK_ORIGSRC)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_ORIGDST) { - if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip&sinfo->dipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip, IPT_CONNTRACK_ORIGDST)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_REPLSRC) { - if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip&sinfo->sipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].src.ip, IPT_CONNTRACK_REPLSRC)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_REPLDST) { - if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip&sinfo->dipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].dst.ip, IPT_CONNTRACK_REPLDST)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_STATUS) { - if (!ct || FWINV((ct->status & sinfo->statusmask) == 0, IPT_CONNTRACK_STATUS)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_EXPIRES) { - unsigned long expires; - - if(!ct) - return 0; - - expires = timer_pending(&ct->timeout) ? (ct->timeout.expires - jiffies)/HZ : 0; - - if (FWINV(!(expires >= sinfo->expires_min && expires <= sinfo->expires_max), IPT_CONNTRACK_EXPIRES)) - return 0; - } - - return 1; -} - -#else /* CONFIG_IP_NF_CONNTRACK */ -static int -match(const struct sk_buff *skb, - const struct net_device *in, - const struct net_device *out, - const void *matchinfo, - int offset, - int *hotdrop) -{ - const struct ipt_conntrack_info *sinfo = matchinfo; - struct nf_conn *ct; - enum ip_conntrack_info ctinfo; - unsigned int statebit; - - ct = nf_ct_get((struct sk_buff *)skb, &ctinfo); - -#define FWINV(bool,invflg) ((bool) ^ !!(sinfo->invflags & invflg)) - - if (ct == &nf_conntrack_untracked) - statebit = IPT_CONNTRACK_STATE_UNTRACKED; - else if (ct) - statebit = IPT_CONNTRACK_STATE_BIT(ctinfo); - else - statebit = IPT_CONNTRACK_STATE_INVALID; - - if(sinfo->flags & IPT_CONNTRACK_STATE) { - if (ct) { - if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip != - ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip) - statebit |= IPT_CONNTRACK_STATE_SNAT; - - if(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.ip != - ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip) - statebit |= IPT_CONNTRACK_STATE_DNAT; - } - - if (FWINV((statebit & sinfo->statemask) == 0, IPT_CONNTRACK_STATE)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_PROTO) { - if (!ct || FWINV(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum, IPT_CONNTRACK_PROTO)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_ORIGSRC) { - if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip&sinfo->sipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip, IPT_CONNTRACK_ORIGSRC)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_ORIGDST) { - if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.ip&sinfo->dipmsk[IP_CT_DIR_ORIGINAL].s_addr) != sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip, IPT_CONNTRACK_ORIGDST)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_REPLSRC) { - if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip&sinfo->sipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].src.ip, IPT_CONNTRACK_REPLSRC)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_REPLDST) { - if (!ct || FWINV((ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip&sinfo->dipmsk[IP_CT_DIR_REPLY].s_addr) != sinfo->tuple[IP_CT_DIR_REPLY].dst.ip, IPT_CONNTRACK_REPLDST)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_STATUS) { - if (!ct || FWINV((ct->status & sinfo->statusmask) == 0, IPT_CONNTRACK_STATUS)) - return 0; - } - - if(sinfo->flags & IPT_CONNTRACK_EXPIRES) { - unsigned long expires; - - if(!ct) - return 0; - - expires = timer_pending(&ct->timeout) ? (ct->timeout.expires - jiffies)/HZ : 0; - - if (FWINV(!(expires >= sinfo->expires_min && expires <= sinfo->expires_max), IPT_CONNTRACK_EXPIRES)) - return 0; - } - - return 1; -} - -#endif /* CONFIG_NF_IP_CONNTRACK */ - -static int check(const char *tablename, - const struct ipt_ip *ip, - void *matchinfo, - unsigned int matchsize, - unsigned int hook_mask) -{ - if (matchsize != IPT_ALIGN(sizeof(struct ipt_conntrack_info))) - return 0; - - return 1; -} - -static struct ipt_match conntrack_match = { - .name = "conntrack", - .match = &match, - .checkentry = &check, - .me = THIS_MODULE, -}; - -static int __init init(void) -{ - need_ip_conntrack(); - return ipt_register_match(&conntrack_match); -} - -static void __exit fini(void) -{ - ipt_unregister_match(&conntrack_match); -} - -module_init(init); -module_exit(fini); |