557 lines
14 KiB
C
557 lines
14 KiB
C
/* This file contains all the functions required for the standalone
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nf_conntrack module.
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These are not required by the compatibility layer.
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*/
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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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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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - generalize L3 protocol dependent part.
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*
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* Derived from net/ipv4/netfilter/ip_conntrack_standalone.c
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*/
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#include <linux/types.h>
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#include <linux/netfilter.h>
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#include <linux/module.h>
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#include <linux/skbuff.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/percpu.h>
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#include <linux/netdevice.h>
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#ifdef CONFIG_SYSCTL
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#include <linux/sysctl.h>
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#endif
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_l3proto.h>
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#include <net/netfilter/nf_conntrack_l4proto.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(format, args...)
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#endif
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MODULE_LICENSE("GPL");
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#ifdef CONFIG_PROC_FS
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int
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print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
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struct nf_conntrack_l3proto *l3proto,
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struct nf_conntrack_l4proto *l4proto)
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{
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return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
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}
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#ifdef CONFIG_NF_CT_ACCT
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static unsigned int
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seq_print_counters(struct seq_file *s,
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const struct ip_conntrack_counter *counter)
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{
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return seq_printf(s, "packets=%llu bytes=%llu ",
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(unsigned long long)counter->packets,
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(unsigned long long)counter->bytes);
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}
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#else
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#define seq_print_counters(x, y) 0
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#endif
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struct ct_iter_state {
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unsigned int bucket;
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};
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static struct list_head *ct_get_first(struct seq_file *seq)
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{
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struct ct_iter_state *st = seq->private;
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for (st->bucket = 0;
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st->bucket < nf_conntrack_htable_size;
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st->bucket++) {
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if (!list_empty(&nf_conntrack_hash[st->bucket]))
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return nf_conntrack_hash[st->bucket].next;
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}
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return NULL;
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}
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static struct list_head *ct_get_next(struct seq_file *seq, struct list_head *head)
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{
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struct ct_iter_state *st = seq->private;
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head = head->next;
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while (head == &nf_conntrack_hash[st->bucket]) {
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if (++st->bucket >= nf_conntrack_htable_size)
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return NULL;
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head = nf_conntrack_hash[st->bucket].next;
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}
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return head;
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}
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static struct list_head *ct_get_idx(struct seq_file *seq, loff_t pos)
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{
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struct list_head *head = ct_get_first(seq);
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if (head)
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while (pos && (head = ct_get_next(seq, head)))
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pos--;
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return pos ? NULL : head;
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}
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static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
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{
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read_lock_bh(&nf_conntrack_lock);
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return ct_get_idx(seq, *pos);
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}
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static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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(*pos)++;
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return ct_get_next(s, v);
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}
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static void ct_seq_stop(struct seq_file *s, void *v)
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{
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read_unlock_bh(&nf_conntrack_lock);
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}
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/* return 0 on success, 1 in case of error */
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static int ct_seq_show(struct seq_file *s, void *v)
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{
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const struct nf_conntrack_tuple_hash *hash = v;
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const struct nf_conn *conntrack = nf_ct_tuplehash_to_ctrack(hash);
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struct nf_conntrack_l3proto *l3proto;
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struct nf_conntrack_l4proto *l4proto;
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NF_CT_ASSERT(conntrack);
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/* we only want to print DIR_ORIGINAL */
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if (NF_CT_DIRECTION(hash))
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return 0;
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l3proto = __nf_ct_l3proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
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.tuple.src.l3num);
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NF_CT_ASSERT(l3proto);
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l4proto = __nf_ct_l4proto_find(conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
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.tuple.src.l3num,
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conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
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.tuple.dst.protonum);
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NF_CT_ASSERT(l4proto);
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if (seq_printf(s, "%-8s %u %-8s %u %ld ",
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l3proto->name,
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conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num,
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l4proto->name,
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conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum,
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timer_pending(&conntrack->timeout)
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? (long)(conntrack->timeout.expires - jiffies)/HZ : 0) != 0)
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return -ENOSPC;
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if (l3proto->print_conntrack(s, conntrack))
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return -ENOSPC;
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if (l4proto->print_conntrack(s, conntrack))
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return -ENOSPC;
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if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
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l3proto, l4proto))
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return -ENOSPC;
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if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_ORIGINAL]))
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return -ENOSPC;
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if (!(test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)))
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if (seq_printf(s, "[UNREPLIED] "))
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return -ENOSPC;
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if (print_tuple(s, &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple,
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l3proto, l4proto))
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return -ENOSPC;
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if (seq_print_counters(s, &conntrack->counters[IP_CT_DIR_REPLY]))
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return -ENOSPC;
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if (test_bit(IPS_ASSURED_BIT, &conntrack->status))
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if (seq_printf(s, "[ASSURED] "))
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return -ENOSPC;
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#if defined(CONFIG_NF_CONNTRACK_MARK)
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if (seq_printf(s, "mark=%u ", conntrack->mark))
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return -ENOSPC;
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#endif
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
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if (seq_printf(s, "secmark=%u ", conntrack->secmark))
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return -ENOSPC;
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#endif
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if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use)))
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return -ENOSPC;
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return 0;
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}
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static struct seq_operations ct_seq_ops = {
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.start = ct_seq_start,
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.next = ct_seq_next,
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.stop = ct_seq_stop,
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.show = ct_seq_show
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};
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static int ct_open(struct inode *inode, struct file *file)
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{
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struct seq_file *seq;
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struct ct_iter_state *st;
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int ret;
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st = kmalloc(sizeof(struct ct_iter_state), GFP_KERNEL);
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if (st == NULL)
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return -ENOMEM;
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ret = seq_open(file, &ct_seq_ops);
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if (ret)
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goto out_free;
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seq = file->private_data;
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seq->private = st;
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memset(st, 0, sizeof(struct ct_iter_state));
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return ret;
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out_free:
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kfree(st);
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return ret;
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}
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static struct file_operations ct_file_ops = {
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.owner = THIS_MODULE,
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.open = ct_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_private,
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};
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static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
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{
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int cpu;
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if (*pos == 0)
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return SEQ_START_TOKEN;
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for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
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if (!cpu_possible(cpu))
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continue;
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*pos = cpu + 1;
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return &per_cpu(nf_conntrack_stat, cpu);
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}
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return NULL;
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}
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static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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int cpu;
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for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
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if (!cpu_possible(cpu))
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continue;
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*pos = cpu + 1;
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return &per_cpu(nf_conntrack_stat, cpu);
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}
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return NULL;
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}
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static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
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{
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}
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static int ct_cpu_seq_show(struct seq_file *seq, void *v)
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{
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unsigned int nr_conntracks = atomic_read(&nf_conntrack_count);
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struct ip_conntrack_stat *st = v;
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if (v == SEQ_START_TOKEN) {
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seq_printf(seq, "entries searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete\n");
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return 0;
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}
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seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
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"%08x %08x %08x %08x %08x %08x %08x %08x \n",
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nr_conntracks,
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st->searched,
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st->found,
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st->new,
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st->invalid,
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st->ignore,
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st->delete,
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st->delete_list,
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st->insert,
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st->insert_failed,
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st->drop,
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st->early_drop,
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st->error,
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st->expect_new,
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st->expect_create,
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st->expect_delete
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);
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return 0;
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}
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static struct seq_operations ct_cpu_seq_ops = {
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.start = ct_cpu_seq_start,
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.next = ct_cpu_seq_next,
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.stop = ct_cpu_seq_stop,
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.show = ct_cpu_seq_show,
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};
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static int ct_cpu_seq_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &ct_cpu_seq_ops);
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}
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static struct file_operations ct_cpu_seq_fops = {
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.owner = THIS_MODULE,
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.open = ct_cpu_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_private,
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};
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#endif /* CONFIG_PROC_FS */
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/* Sysctl support */
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int nf_conntrack_checksum __read_mostly = 1;
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#ifdef CONFIG_SYSCTL
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/* Log invalid packets of a given protocol */
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static int log_invalid_proto_min = 0;
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static int log_invalid_proto_max = 255;
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static struct ctl_table_header *nf_ct_sysctl_header;
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static ctl_table nf_ct_sysctl_table[] = {
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{
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.ctl_name = NET_NF_CONNTRACK_MAX,
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.procname = "nf_conntrack_max",
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.data = &nf_conntrack_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = NET_NF_CONNTRACK_COUNT,
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.procname = "nf_conntrack_count",
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.data = &nf_conntrack_count,
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.maxlen = sizeof(int),
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.mode = 0444,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = NET_NF_CONNTRACK_BUCKETS,
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.procname = "nf_conntrack_buckets",
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.data = &nf_conntrack_htable_size,
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.maxlen = sizeof(unsigned int),
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.mode = 0444,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = NET_NF_CONNTRACK_CHECKSUM,
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.procname = "nf_conntrack_checksum",
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.data = &nf_conntrack_checksum,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = NET_NF_CONNTRACK_LOG_INVALID,
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.procname = "nf_conntrack_log_invalid",
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.data = &nf_ct_log_invalid,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra1 = &log_invalid_proto_min,
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.extra2 = &log_invalid_proto_max,
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},
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{ .ctl_name = 0 }
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};
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#define NET_NF_CONNTRACK_MAX 2089
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static ctl_table nf_ct_netfilter_table[] = {
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{
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.ctl_name = NET_NETFILTER,
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.procname = "netfilter",
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.mode = 0555,
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.child = nf_ct_sysctl_table,
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},
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{
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.ctl_name = NET_NF_CONNTRACK_MAX,
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.procname = "nf_conntrack_max",
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.data = &nf_conntrack_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table nf_ct_net_table[] = {
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{
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.ctl_name = CTL_NET,
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.procname = "net",
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.mode = 0555,
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.child = nf_ct_netfilter_table,
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},
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{ .ctl_name = 0 }
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};
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EXPORT_SYMBOL(nf_ct_log_invalid);
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#endif /* CONFIG_SYSCTL */
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static int __init nf_conntrack_standalone_init(void)
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{
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *proc, *proc_exp, *proc_stat;
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#endif
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int ret = 0;
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ret = nf_conntrack_init();
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if (ret < 0)
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return ret;
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#ifdef CONFIG_PROC_FS
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proc = proc_net_fops_create("nf_conntrack", 0440, &ct_file_ops);
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if (!proc) goto cleanup_init;
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proc_exp = proc_net_fops_create("nf_conntrack_expect", 0440,
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&exp_file_ops);
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if (!proc_exp) goto cleanup_proc;
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proc_stat = create_proc_entry("nf_conntrack", S_IRUGO, proc_net_stat);
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if (!proc_stat)
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goto cleanup_proc_exp;
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proc_stat->proc_fops = &ct_cpu_seq_fops;
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proc_stat->owner = THIS_MODULE;
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#endif
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#ifdef CONFIG_SYSCTL
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nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0);
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if (nf_ct_sysctl_header == NULL) {
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printk("nf_conntrack: can't register to sysctl.\n");
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ret = -ENOMEM;
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goto cleanup_proc_stat;
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}
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#endif
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return ret;
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#ifdef CONFIG_SYSCTL
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cleanup_proc_stat:
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#endif
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#ifdef CONFIG_PROC_FS
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remove_proc_entry("nf_conntrack", proc_net_stat);
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cleanup_proc_exp:
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proc_net_remove("nf_conntrack_expect");
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cleanup_proc:
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proc_net_remove("nf_conntrack");
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cleanup_init:
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#endif /* CNFIG_PROC_FS */
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nf_conntrack_cleanup();
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return ret;
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}
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static void __exit nf_conntrack_standalone_fini(void)
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{
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#ifdef CONFIG_SYSCTL
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unregister_sysctl_table(nf_ct_sysctl_header);
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#endif
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#ifdef CONFIG_PROC_FS
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remove_proc_entry("nf_conntrack", proc_net_stat);
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proc_net_remove("nf_conntrack_expect");
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proc_net_remove("nf_conntrack");
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#endif /* CNFIG_PROC_FS */
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nf_conntrack_cleanup();
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}
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module_init(nf_conntrack_standalone_init);
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module_exit(nf_conntrack_standalone_fini);
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/* Some modules need us, but don't depend directly on any symbol.
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They should call this. */
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void need_conntrack(void)
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{
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}
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#ifdef CONFIG_NF_CONNTRACK_EVENTS
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EXPORT_SYMBOL_GPL(nf_conntrack_chain);
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EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
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EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
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EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
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EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
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EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
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EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
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#endif
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EXPORT_SYMBOL(nf_ct_l3proto_try_module_get);
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EXPORT_SYMBOL(nf_ct_l3proto_module_put);
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EXPORT_SYMBOL(nf_conntrack_l3proto_register);
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EXPORT_SYMBOL(nf_conntrack_l3proto_unregister);
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EXPORT_SYMBOL(nf_conntrack_l4proto_register);
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EXPORT_SYMBOL(nf_conntrack_l4proto_unregister);
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EXPORT_SYMBOL(nf_ct_invert_tuplepr);
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EXPORT_SYMBOL(nf_conntrack_destroyed);
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EXPORT_SYMBOL(need_conntrack);
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EXPORT_SYMBOL(nf_conntrack_helper_register);
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EXPORT_SYMBOL(nf_conntrack_helper_unregister);
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EXPORT_SYMBOL(nf_ct_iterate_cleanup);
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EXPORT_SYMBOL(__nf_ct_refresh_acct);
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EXPORT_SYMBOL(nf_ct_protos);
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EXPORT_SYMBOL(__nf_ct_l4proto_find);
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EXPORT_SYMBOL(nf_ct_l4proto_find_get);
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EXPORT_SYMBOL(nf_ct_l4proto_put);
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EXPORT_SYMBOL(nf_ct_l3proto_find_get);
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EXPORT_SYMBOL(nf_ct_l3proto_put);
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EXPORT_SYMBOL(nf_ct_l3protos);
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EXPORT_SYMBOL_GPL(nf_conntrack_checksum);
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EXPORT_SYMBOL(nf_conntrack_expect_alloc);
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EXPORT_SYMBOL(nf_conntrack_expect_put);
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EXPORT_SYMBOL(nf_conntrack_expect_related);
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EXPORT_SYMBOL(nf_conntrack_unexpect_related);
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EXPORT_SYMBOL(nf_conntrack_tuple_taken);
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EXPORT_SYMBOL(nf_conntrack_htable_size);
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EXPORT_SYMBOL(nf_conntrack_lock);
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EXPORT_SYMBOL(nf_conntrack_hash);
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EXPORT_SYMBOL(nf_conntrack_untracked);
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EXPORT_SYMBOL_GPL(nf_conntrack_find_get);
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#ifdef CONFIG_IP_NF_NAT_NEEDED
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EXPORT_SYMBOL(nf_conntrack_tcp_update);
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#endif
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EXPORT_SYMBOL(__nf_conntrack_confirm);
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EXPORT_SYMBOL(nf_ct_get_tuple);
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EXPORT_SYMBOL(nf_ct_invert_tuple);
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EXPORT_SYMBOL(nf_conntrack_in);
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EXPORT_SYMBOL(__nf_conntrack_attach);
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EXPORT_SYMBOL(nf_conntrack_alloc);
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EXPORT_SYMBOL(nf_conntrack_free);
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EXPORT_SYMBOL(nf_conntrack_flush);
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EXPORT_SYMBOL(nf_ct_remove_expectations);
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EXPORT_SYMBOL(nf_ct_helper_find_get);
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EXPORT_SYMBOL(nf_ct_helper_put);
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EXPORT_SYMBOL(__nf_conntrack_helper_find_byname);
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EXPORT_SYMBOL(__nf_conntrack_find);
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EXPORT_SYMBOL(nf_ct_unlink_expect);
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EXPORT_SYMBOL(nf_conntrack_hash_insert);
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EXPORT_SYMBOL(__nf_conntrack_expect_find);
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EXPORT_SYMBOL(nf_conntrack_expect_find);
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EXPORT_SYMBOL(nf_conntrack_expect_list);
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#if defined(CONFIG_NF_CT_NETLINK) || \
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|
defined(CONFIG_NF_CT_NETLINK_MODULE)
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EXPORT_SYMBOL(nf_ct_port_tuple_to_nfattr);
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EXPORT_SYMBOL(nf_ct_port_nfattr_to_tuple);
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#endif
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