diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_standalone.c')
-rw-r--r-- | net/netfilter/nf_conntrack_standalone.c | 590 |
1 files changed, 590 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c new file mode 100644 index 00000000..05e9feb1 --- /dev/null +++ b/net/netfilter/nf_conntrack_standalone.c @@ -0,0 +1,590 @@ +/* (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> + * + * 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/types.h> +#include <linux/netfilter.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/skbuff.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/percpu.h> +#include <linux/netdevice.h> +#include <linux/security.h> +#include <net/net_namespace.h> +#ifdef CONFIG_SYSCTL +#include <linux/sysctl.h> +#endif + +#include <net/netfilter/nf_conntrack.h> +#include <net/netfilter/nf_conntrack_core.h> +#include <net/netfilter/nf_conntrack_l3proto.h> +#include <net/netfilter/nf_conntrack_l4proto.h> +#include <net/netfilter/nf_conntrack_expect.h> +#include <net/netfilter/nf_conntrack_helper.h> +#include <net/netfilter/nf_conntrack_acct.h> +#include <net/netfilter/nf_conntrack_zones.h> +#include <net/netfilter/nf_conntrack_timestamp.h> +#include <linux/rculist_nulls.h> + +MODULE_LICENSE("GPL"); + +#ifdef CONFIG_PROC_FS +int +print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple, + const struct nf_conntrack_l3proto *l3proto, + const struct nf_conntrack_l4proto *l4proto) +{ + return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple); +} +EXPORT_SYMBOL_GPL(print_tuple); + +struct ct_iter_state { + struct seq_net_private p; + unsigned int bucket; + u_int64_t time_now; +}; + +static struct hlist_nulls_node *ct_get_first(struct seq_file *seq) +{ + struct net *net = seq_file_net(seq); + struct ct_iter_state *st = seq->private; + struct hlist_nulls_node *n; + + for (st->bucket = 0; + st->bucket < net->ct.htable_size; + st->bucket++) { + n = rcu_dereference(hlist_nulls_first_rcu(&net->ct.hash[st->bucket])); + if (!is_a_nulls(n)) + return n; + } + return NULL; +} + +static struct hlist_nulls_node *ct_get_next(struct seq_file *seq, + struct hlist_nulls_node *head) +{ + struct net *net = seq_file_net(seq); + struct ct_iter_state *st = seq->private; + + head = rcu_dereference(hlist_nulls_next_rcu(head)); + while (is_a_nulls(head)) { + if (likely(get_nulls_value(head) == st->bucket)) { + if (++st->bucket >= net->ct.htable_size) + return NULL; + } + head = rcu_dereference( + hlist_nulls_first_rcu( + &net->ct.hash[st->bucket])); + } + return head; +} + +static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos) +{ + struct hlist_nulls_node *head = ct_get_first(seq); + + if (head) + while (pos && (head = ct_get_next(seq, head))) + pos--; + return pos ? NULL : head; +} + +static void *ct_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(RCU) +{ + struct ct_iter_state *st = seq->private; + + st->time_now = ktime_to_ns(ktime_get_real()); + rcu_read_lock(); + return ct_get_idx(seq, *pos); +} + +static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos) +{ + (*pos)++; + return ct_get_next(s, v); +} + +static void ct_seq_stop(struct seq_file *s, void *v) + __releases(RCU) +{ + rcu_read_unlock(); +} + +#ifdef CONFIG_NF_CONNTRACK_SECMARK +static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) +{ + int ret; + u32 len; + char *secctx; + + ret = security_secid_to_secctx(ct->secmark, &secctx, &len); + if (ret) + return 0; + + ret = seq_printf(s, "secctx=%s ", secctx); + + security_release_secctx(secctx, len); + return ret; +} +#else +static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct) +{ + return 0; +} +#endif + +#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP +static int ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct) +{ + struct ct_iter_state *st = s->private; + struct nf_conn_tstamp *tstamp; + s64 delta_time; + + tstamp = nf_conn_tstamp_find(ct); + if (tstamp) { + delta_time = st->time_now - tstamp->start; + if (delta_time > 0) + delta_time = div_s64(delta_time, NSEC_PER_SEC); + else + delta_time = 0; + + return seq_printf(s, "delta-time=%llu ", + (unsigned long long)delta_time); + } + return 0; +} +#else +static inline int +ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct) +{ + return 0; +} +#endif + +/* return 0 on success, 1 in case of error */ +static int ct_seq_show(struct seq_file *s, void *v) +{ + struct nf_conntrack_tuple_hash *hash = v; + struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash); + const struct nf_conntrack_l3proto *l3proto; + const struct nf_conntrack_l4proto *l4proto; + int ret = 0; + + NF_CT_ASSERT(ct); + if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use))) + return 0; + + /* we only want to print DIR_ORIGINAL */ + if (NF_CT_DIRECTION(hash)) + goto release; + + l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct)); + NF_CT_ASSERT(l3proto); + l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); + NF_CT_ASSERT(l4proto); + + ret = -ENOSPC; + if (seq_printf(s, "%-8s %u %-8s %u %ld ", + l3proto->name, nf_ct_l3num(ct), + l4proto->name, nf_ct_protonum(ct), + timer_pending(&ct->timeout) + ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0) + goto release; + + if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct)) + goto release; + + if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, + l3proto, l4proto)) + goto release; + + if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL)) + goto release; + + if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status))) + if (seq_printf(s, "[UNREPLIED] ")) + goto release; + + if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, + l3proto, l4proto)) + goto release; + + if (seq_print_acct(s, ct, IP_CT_DIR_REPLY)) + goto release; + + if (test_bit(IPS_ASSURED_BIT, &ct->status)) + if (seq_printf(s, "[ASSURED] ")) + goto release; + +#if defined(CONFIG_NF_CONNTRACK_MARK) + if (seq_printf(s, "mark=%u ", ct->mark)) + goto release; +#endif + + if (ct_show_secctx(s, ct)) + goto release; + +#ifdef CONFIG_NF_CONNTRACK_ZONES + if (seq_printf(s, "zone=%u ", nf_ct_zone(ct))) + goto release; +#endif + + if (ct_show_delta_time(s, ct)) + goto release; + + if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use))) + goto release; + + ret = 0; +release: + nf_ct_put(ct); + return ret; +} + +static const struct seq_operations ct_seq_ops = { + .start = ct_seq_start, + .next = ct_seq_next, + .stop = ct_seq_stop, + .show = ct_seq_show +}; + +static int ct_open(struct inode *inode, struct file *file) +{ + return seq_open_net(inode, file, &ct_seq_ops, + sizeof(struct ct_iter_state)); +} + +static const struct file_operations ct_file_ops = { + .owner = THIS_MODULE, + .open = ct_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_net, +}; + +static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos) +{ + struct net *net = seq_file_net(seq); + int cpu; + + if (*pos == 0) + return SEQ_START_TOKEN; + + for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { + if (!cpu_possible(cpu)) + continue; + *pos = cpu + 1; + return per_cpu_ptr(net->ct.stat, cpu); + } + + return NULL; +} + +static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct net *net = seq_file_net(seq); + int cpu; + + for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { + if (!cpu_possible(cpu)) + continue; + *pos = cpu + 1; + return per_cpu_ptr(net->ct.stat, cpu); + } + + return NULL; +} + +static void ct_cpu_seq_stop(struct seq_file *seq, void *v) +{ +} + +static int ct_cpu_seq_show(struct seq_file *seq, void *v) +{ + struct net *net = seq_file_net(seq); + unsigned int nr_conntracks = atomic_read(&net->ct.count); + const struct ip_conntrack_stat *st = v; + + if (v == SEQ_START_TOKEN) { + 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 search_restart\n"); + return 0; + } + + seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x " + "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", + nr_conntracks, + st->searched, + st->found, + st->new, + st->invalid, + st->ignore, + st->delete, + st->delete_list, + st->insert, + st->insert_failed, + st->drop, + st->early_drop, + st->error, + + st->expect_new, + st->expect_create, + st->expect_delete, + st->search_restart + ); + return 0; +} + +static const struct seq_operations ct_cpu_seq_ops = { + .start = ct_cpu_seq_start, + .next = ct_cpu_seq_next, + .stop = ct_cpu_seq_stop, + .show = ct_cpu_seq_show, +}; + +static int ct_cpu_seq_open(struct inode *inode, struct file *file) +{ + return seq_open_net(inode, file, &ct_cpu_seq_ops, + sizeof(struct seq_net_private)); +} + +static const struct file_operations ct_cpu_seq_fops = { + .owner = THIS_MODULE, + .open = ct_cpu_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_net, +}; + +static int nf_conntrack_standalone_init_proc(struct net *net) +{ + struct proc_dir_entry *pde; + + pde = proc_net_fops_create(net, "nf_conntrack", 0440, &ct_file_ops); + if (!pde) + goto out_nf_conntrack; + + pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat, + &ct_cpu_seq_fops); + if (!pde) + goto out_stat_nf_conntrack; + return 0; + +out_stat_nf_conntrack: + proc_net_remove(net, "nf_conntrack"); +out_nf_conntrack: + return -ENOMEM; +} + +static void nf_conntrack_standalone_fini_proc(struct net *net) +{ + remove_proc_entry("nf_conntrack", net->proc_net_stat); + proc_net_remove(net, "nf_conntrack"); +} +#else +static int nf_conntrack_standalone_init_proc(struct net *net) +{ + return 0; +} + +static void nf_conntrack_standalone_fini_proc(struct net *net) +{ +} +#endif /* CONFIG_PROC_FS */ + +/* Sysctl support */ + +#ifdef CONFIG_SYSCTL +/* Log invalid packets of a given protocol */ +static int log_invalid_proto_min = 0; +static int log_invalid_proto_max = 255; + +static struct ctl_table_header *nf_ct_netfilter_header; + +static ctl_table nf_ct_sysctl_table[] = { + { + .procname = "nf_conntrack_max", + .data = &nf_conntrack_max, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "nf_conntrack_count", + .data = &init_net.ct.count, + .maxlen = sizeof(int), + .mode = 0444, + .proc_handler = proc_dointvec, + }, + { + .procname = "nf_conntrack_buckets", + .data = &init_net.ct.htable_size, + .maxlen = sizeof(unsigned int), + .mode = 0444, + .proc_handler = proc_dointvec, + }, + { + .procname = "nf_conntrack_checksum", + .data = &init_net.ct.sysctl_checksum, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "nf_conntrack_log_invalid", + .data = &init_net.ct.sysctl_log_invalid, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &log_invalid_proto_min, + .extra2 = &log_invalid_proto_max, + }, + { + .procname = "nf_conntrack_expect_max", + .data = &nf_ct_expect_max, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { } +}; + +#define NET_NF_CONNTRACK_MAX 2089 + +static ctl_table nf_ct_netfilter_table[] = { + { + .procname = "nf_conntrack_max", + .data = &nf_conntrack_max, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { } +}; + +static struct ctl_path nf_ct_path[] = { + { .procname = "net", }, + { } +}; + +static int nf_conntrack_standalone_init_sysctl(struct net *net) +{ + struct ctl_table *table; + + if (net_eq(net, &init_net)) { + nf_ct_netfilter_header = + register_sysctl_paths(nf_ct_path, nf_ct_netfilter_table); + if (!nf_ct_netfilter_header) + goto out; + } + + table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table), + GFP_KERNEL); + if (!table) + goto out_kmemdup; + + table[1].data = &net->ct.count; + table[2].data = &net->ct.htable_size; + table[3].data = &net->ct.sysctl_checksum; + table[4].data = &net->ct.sysctl_log_invalid; + + net->ct.sysctl_header = register_net_sysctl_table(net, + nf_net_netfilter_sysctl_path, table); + if (!net->ct.sysctl_header) + goto out_unregister_netfilter; + + return 0; + +out_unregister_netfilter: + kfree(table); +out_kmemdup: + if (net_eq(net, &init_net)) + unregister_sysctl_table(nf_ct_netfilter_header); +out: + printk(KERN_ERR "nf_conntrack: can't register to sysctl.\n"); + return -ENOMEM; +} + +static void nf_conntrack_standalone_fini_sysctl(struct net *net) +{ + struct ctl_table *table; + + if (net_eq(net, &init_net)) + unregister_sysctl_table(nf_ct_netfilter_header); + table = net->ct.sysctl_header->ctl_table_arg; + unregister_net_sysctl_table(net->ct.sysctl_header); + kfree(table); +} +#else +static int nf_conntrack_standalone_init_sysctl(struct net *net) +{ + return 0; +} + +static void nf_conntrack_standalone_fini_sysctl(struct net *net) +{ +} +#endif /* CONFIG_SYSCTL */ + +static int nf_conntrack_net_init(struct net *net) +{ + int ret; + + ret = nf_conntrack_init(net); + if (ret < 0) + goto out_init; + ret = nf_conntrack_standalone_init_proc(net); + if (ret < 0) + goto out_proc; + net->ct.sysctl_checksum = 1; + net->ct.sysctl_log_invalid = 0; + ret = nf_conntrack_standalone_init_sysctl(net); + if (ret < 0) + goto out_sysctl; + return 0; + +out_sysctl: + nf_conntrack_standalone_fini_proc(net); +out_proc: + nf_conntrack_cleanup(net); +out_init: + return ret; +} + +static void nf_conntrack_net_exit(struct net *net) +{ + nf_conntrack_standalone_fini_sysctl(net); + nf_conntrack_standalone_fini_proc(net); + nf_conntrack_cleanup(net); +} + +static struct pernet_operations nf_conntrack_net_ops = { + .init = nf_conntrack_net_init, + .exit = nf_conntrack_net_exit, +}; + +static int __init nf_conntrack_standalone_init(void) +{ + return register_pernet_subsys(&nf_conntrack_net_ops); +} + +static void __exit nf_conntrack_standalone_fini(void) +{ + 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); 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