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![Alexey Dobriyan](/assets/img/avatar_default.png)
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
519 lines
12 KiB
C
519 lines
12 KiB
C
/* (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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#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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#include <net/net_namespace.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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#include <net/netfilter/nf_conntrack_acct.h>
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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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const struct nf_conntrack_l3proto *l3proto,
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const 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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EXPORT_SYMBOL_GPL(print_tuple);
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struct ct_iter_state {
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struct seq_net_private p;
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unsigned int bucket;
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};
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static struct hlist_node *ct_get_first(struct seq_file *seq)
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{
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struct net *net = seq_file_net(seq);
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struct ct_iter_state *st = seq->private;
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struct hlist_node *n;
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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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n = rcu_dereference(net->ct.hash[st->bucket].first);
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if (n)
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return n;
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}
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return NULL;
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}
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static struct hlist_node *ct_get_next(struct seq_file *seq,
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struct hlist_node *head)
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{
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struct net *net = seq_file_net(seq);
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struct ct_iter_state *st = seq->private;
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head = rcu_dereference(head->next);
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while (head == NULL) {
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if (++st->bucket >= nf_conntrack_htable_size)
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return NULL;
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head = rcu_dereference(net->ct.hash[st->bucket].first);
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}
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return head;
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}
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static struct hlist_node *ct_get_idx(struct seq_file *seq, loff_t pos)
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{
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struct hlist_node *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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__acquires(RCU)
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{
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rcu_read_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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__releases(RCU)
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{
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rcu_read_unlock();
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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 *ct = nf_ct_tuplehash_to_ctrack(hash);
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const struct nf_conntrack_l3proto *l3proto;
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const struct nf_conntrack_l4proto *l4proto;
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NF_CT_ASSERT(ct);
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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(nf_ct_l3num(ct));
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NF_CT_ASSERT(l3proto);
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l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
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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, nf_ct_l3num(ct),
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l4proto->name, nf_ct_protonum(ct),
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timer_pending(&ct->timeout)
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? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
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return -ENOSPC;
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if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
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return -ENOSPC;
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if (print_tuple(s, &ct->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_acct(s, ct, IP_CT_DIR_ORIGINAL))
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return -ENOSPC;
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if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
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if (seq_printf(s, "[UNREPLIED] "))
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return -ENOSPC;
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if (print_tuple(s, &ct->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_acct(s, ct, IP_CT_DIR_REPLY))
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return -ENOSPC;
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if (test_bit(IPS_ASSURED_BIT, &ct->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 ", ct->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 ", ct->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(&ct->ct_general.use)))
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return -ENOSPC;
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return 0;
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}
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static const 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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return seq_open_net(inode, file, &ct_seq_ops,
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sizeof(struct ct_iter_state));
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}
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static const 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_net,
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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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struct net *net = seq_file_net(seq);
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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_ptr(net->ct.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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struct net *net = seq_file_net(seq);
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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_ptr(net->ct.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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struct net *net = seq_file_net(seq);
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unsigned int nr_conntracks = atomic_read(&net->ct.count);
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const 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 const 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_net(inode, file, &ct_cpu_seq_ops,
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sizeof(struct seq_net_private));
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}
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static const 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_net,
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};
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static int nf_conntrack_standalone_init_proc(struct net *net)
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{
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struct proc_dir_entry *pde;
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pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops);
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if (!pde)
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goto out_nf_conntrack;
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pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
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&ct_cpu_seq_fops);
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if (!pde)
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goto out_stat_nf_conntrack;
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return 0;
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out_stat_nf_conntrack:
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proc_net_remove(net, "nf_conntrack");
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out_nf_conntrack:
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return -ENOMEM;
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}
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static void nf_conntrack_standalone_fini_proc(struct net *net)
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{
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remove_proc_entry("nf_conntrack", net->proc_net_stat);
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proc_net_remove(net, "nf_conntrack");
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}
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#else
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static int nf_conntrack_standalone_init_proc(struct net *net)
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{
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return 0;
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}
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static void nf_conntrack_standalone_fini_proc(struct net *net)
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{
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}
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#endif /* CONFIG_PROC_FS */
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/* Sysctl support */
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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_netfilter_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 = &init_net.ct.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 = &init_net.ct.sysctl_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 = &init_net.ct.sysctl_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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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "nf_conntrack_expect_max",
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.data = &nf_ct_expect_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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#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_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 struct ctl_path nf_ct_path[] = {
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{ .procname = "net", .ctl_name = CTL_NET, },
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{ }
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};
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static int nf_conntrack_standalone_init_sysctl(struct net *net)
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{
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struct ctl_table *table;
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if (net_eq(net, &init_net)) {
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nf_ct_netfilter_header =
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register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table);
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if (!nf_ct_netfilter_header)
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goto out;
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}
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table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
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GFP_KERNEL);
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if (!table)
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goto out_kmemdup;
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table[1].data = &net->ct.count;
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table[3].data = &net->ct.sysctl_checksum;
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table[4].data = &net->ct.sysctl_log_invalid;
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net->ct.sysctl_header = register_net_sysctl_table(net,
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nf_net_netfilter_sysctl_path, table);
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if (!net->ct.sysctl_header)
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goto out_unregister_netfilter;
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return 0;
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out_unregister_netfilter:
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kfree(table);
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out_kmemdup:
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if (net_eq(net, &init_net))
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unregister_sysctl_table(nf_ct_netfilter_header);
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out:
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printk("nf_conntrack: can't register to sysctl.\n");
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return -ENOMEM;
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}
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static void nf_conntrack_standalone_fini_sysctl(struct net *net)
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{
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struct ctl_table *table;
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if (net_eq(net, &init_net))
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unregister_sysctl_table(nf_ct_netfilter_header);
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table = net->ct.sysctl_header->ctl_table_arg;
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unregister_net_sysctl_table(net->ct.sysctl_header);
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kfree(table);
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}
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#else
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static int nf_conntrack_standalone_init_sysctl(struct net *net)
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{
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return 0;
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}
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static void nf_conntrack_standalone_fini_sysctl(struct net *net)
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{
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}
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#endif /* CONFIG_SYSCTL */
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static int nf_conntrack_net_init(struct net *net)
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{
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int ret;
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ret = nf_conntrack_init(net);
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if (ret < 0)
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goto out_init;
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ret = nf_conntrack_standalone_init_proc(net);
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if (ret < 0)
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goto out_proc;
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net->ct.sysctl_checksum = 1;
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net->ct.sysctl_log_invalid = 0;
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ret = nf_conntrack_standalone_init_sysctl(net);
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if (ret < 0)
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goto out_sysctl;
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return 0;
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out_sysctl:
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nf_conntrack_standalone_fini_proc(net);
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out_proc:
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nf_conntrack_cleanup(net);
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out_init:
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return ret;
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}
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static void nf_conntrack_net_exit(struct net *net)
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{
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nf_conntrack_standalone_fini_sysctl(net);
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nf_conntrack_standalone_fini_proc(net);
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nf_conntrack_cleanup(net);
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}
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static struct pernet_operations nf_conntrack_net_ops = {
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.init = nf_conntrack_net_init,
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.exit = nf_conntrack_net_exit,
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};
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static int __init nf_conntrack_standalone_init(void)
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{
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return register_pernet_subsys(&nf_conntrack_net_ops);
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}
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static void __exit nf_conntrack_standalone_fini(void)
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{
|
|
unregister_pernet_subsys(&nf_conntrack_net_ops);
|
|
}
|
|
|
|
module_init(nf_conntrack_standalone_init);
|
|
module_exit(nf_conntrack_standalone_fini);
|
|
|
|
/* Some modules need us, but don't depend directly on any symbol.
|
|
They should call this. */
|
|
void need_conntrack(void)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL_GPL(need_conntrack);
|