// SPDX-License-Identifier: GPL-2.0
|
#include <linux/types.h>
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#include <linux/netfilter.h>
|
#include <linux/slab.h>
|
#include <linux/module.h>
|
#include <linux/skbuff.h>
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#include <linux/proc_fs.h>
|
#include <linux/seq_file.h>
|
#include <linux/percpu.h>
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#include <linux/netdevice.h>
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#include <linux/security.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
|
|
#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_l4proto.h>
|
#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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#include <net/netfilter/nf_conntrack_zones.h>
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#include <net/netfilter/nf_conntrack_timestamp.h>
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#include <linux/rculist_nulls.h>
|
|
unsigned int nf_conntrack_net_id __read_mostly;
|
|
#ifdef CONFIG_NF_CONNTRACK_PROCFS
|
void
|
print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
|
const struct nf_conntrack_l4proto *l4proto)
|
{
|
switch (tuple->src.l3num) {
|
case NFPROTO_IPV4:
|
seq_printf(s, "src=%pI4 dst=%pI4 ",
|
&tuple->src.u3.ip, &tuple->dst.u3.ip);
|
break;
|
case NFPROTO_IPV6:
|
seq_printf(s, "src=%pI6 dst=%pI6 ",
|
tuple->src.u3.ip6, tuple->dst.u3.ip6);
|
break;
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default:
|
break;
|
}
|
|
switch (l4proto->l4proto) {
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case IPPROTO_ICMP:
|
seq_printf(s, "type=%u code=%u id=%u ",
|
tuple->dst.u.icmp.type,
|
tuple->dst.u.icmp.code,
|
ntohs(tuple->src.u.icmp.id));
|
break;
|
case IPPROTO_TCP:
|
seq_printf(s, "sport=%hu dport=%hu ",
|
ntohs(tuple->src.u.tcp.port),
|
ntohs(tuple->dst.u.tcp.port));
|
break;
|
case IPPROTO_UDPLITE: /* fallthrough */
|
case IPPROTO_UDP:
|
seq_printf(s, "sport=%hu dport=%hu ",
|
ntohs(tuple->src.u.udp.port),
|
ntohs(tuple->dst.u.udp.port));
|
|
break;
|
case IPPROTO_DCCP:
|
seq_printf(s, "sport=%hu dport=%hu ",
|
ntohs(tuple->src.u.dccp.port),
|
ntohs(tuple->dst.u.dccp.port));
|
break;
|
case IPPROTO_SCTP:
|
seq_printf(s, "sport=%hu dport=%hu ",
|
ntohs(tuple->src.u.sctp.port),
|
ntohs(tuple->dst.u.sctp.port));
|
break;
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case IPPROTO_ICMPV6:
|
seq_printf(s, "type=%u code=%u id=%u ",
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tuple->dst.u.icmp.type,
|
tuple->dst.u.icmp.code,
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ntohs(tuple->src.u.icmp.id));
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break;
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case IPPROTO_GRE:
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seq_printf(s, "srckey=0x%x dstkey=0x%x ",
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ntohs(tuple->src.u.gre.key),
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ntohs(tuple->dst.u.gre.key));
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break;
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default:
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break;
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}
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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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struct hlist_nulls_head *hash;
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unsigned int htable_size;
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unsigned int bucket;
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u_int64_t time_now;
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};
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static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
|
{
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struct ct_iter_state *st = seq->private;
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struct hlist_nulls_node *n;
|
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for (st->bucket = 0;
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st->bucket < st->htable_size;
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st->bucket++) {
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n = rcu_dereference(
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hlist_nulls_first_rcu(&st->hash[st->bucket]));
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if (!is_a_nulls(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_nulls_node *ct_get_next(struct seq_file *seq,
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struct hlist_nulls_node *head)
|
{
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struct ct_iter_state *st = seq->private;
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head = rcu_dereference(hlist_nulls_next_rcu(head));
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while (is_a_nulls(head)) {
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if (likely(get_nulls_value(head) == st->bucket)) {
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if (++st->bucket >= st->htable_size)
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return NULL;
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}
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head = rcu_dereference(
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hlist_nulls_first_rcu(&st->hash[st->bucket]));
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}
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return head;
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}
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static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
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{
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struct hlist_nulls_node *head = ct_get_first(seq);
|
|
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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struct ct_iter_state *st = seq->private;
|
|
st->time_now = ktime_get_real_ns();
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rcu_read_lock();
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nf_conntrack_get_ht(&st->hash, &st->htable_size);
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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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(*pos)++;
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return ct_get_next(s, v);
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}
|
|
static void ct_seq_stop(struct seq_file *s, void *v)
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__releases(RCU)
|
{
|
rcu_read_unlock();
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}
|
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
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static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
|
{
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int ret;
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u32 len;
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char *secctx;
|
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ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
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if (ret)
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return;
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seq_printf(s, "secctx=%s ", secctx);
|
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security_release_secctx(secctx, len);
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}
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#else
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static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
|
{
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}
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#endif
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#ifdef CONFIG_NF_CONNTRACK_ZONES
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static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
|
int dir)
|
{
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const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
|
|
if (zone->dir != dir)
|
return;
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switch (zone->dir) {
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case NF_CT_DEFAULT_ZONE_DIR:
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seq_printf(s, "zone=%u ", zone->id);
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break;
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case NF_CT_ZONE_DIR_ORIG:
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seq_printf(s, "zone-orig=%u ", zone->id);
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break;
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case NF_CT_ZONE_DIR_REPL:
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seq_printf(s, "zone-reply=%u ", zone->id);
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break;
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default:
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break;
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}
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}
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#else
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static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
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int dir)
|
{
|
}
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#endif
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#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
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static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
|
{
|
struct ct_iter_state *st = s->private;
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struct nf_conn_tstamp *tstamp;
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s64 delta_time;
|
|
tstamp = nf_conn_tstamp_find(ct);
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if (tstamp) {
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delta_time = st->time_now - tstamp->start;
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if (delta_time > 0)
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delta_time = div_s64(delta_time, NSEC_PER_SEC);
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else
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delta_time = 0;
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|
seq_printf(s, "delta-time=%llu ",
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(unsigned long long)delta_time);
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}
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return;
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}
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#else
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static inline void
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ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
|
{
|
}
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#endif
|
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static const char* l3proto_name(u16 proto)
|
{
|
switch (proto) {
|
case AF_INET: return "ipv4";
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case AF_INET6: return "ipv6";
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}
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|
return "unknown";
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}
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static const char* l4proto_name(u16 proto)
|
{
|
switch (proto) {
|
case IPPROTO_ICMP: return "icmp";
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case IPPROTO_TCP: return "tcp";
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case IPPROTO_UDP: return "udp";
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case IPPROTO_DCCP: return "dccp";
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case IPPROTO_GRE: return "gre";
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case IPPROTO_SCTP: return "sctp";
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case IPPROTO_UDPLITE: return "udplite";
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case IPPROTO_ICMPV6: return "icmpv6";
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}
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return "unknown";
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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)
|
{
|
struct nf_conntrack_tuple_hash *hash = v;
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struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
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const struct nf_conntrack_l4proto *l4proto;
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struct net *net = seq_file_net(s);
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int ret = 0;
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|
WARN_ON(!ct);
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if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
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return 0;
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|
if (nf_ct_should_gc(ct)) {
|
nf_ct_kill(ct);
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goto release;
|
}
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|
/* we only want to print DIR_ORIGINAL */
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if (NF_CT_DIRECTION(hash))
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goto release;
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|
if (!net_eq(nf_ct_net(ct), net))
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goto release;
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l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
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WARN_ON(!l4proto);
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|
ret = -ENOSPC;
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seq_printf(s, "%-8s %u %-8s %u ",
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l3proto_name(nf_ct_l3num(ct)), nf_ct_l3num(ct),
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l4proto_name(l4proto->l4proto), nf_ct_protonum(ct));
|
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if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
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seq_printf(s, "%ld ", nf_ct_expires(ct) / HZ);
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|
if (l4proto->print_conntrack)
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l4proto->print_conntrack(s, ct);
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print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
|
l4proto);
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ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
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|
if (seq_has_overflowed(s))
|
goto release;
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|
if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
|
goto release;
|
|
if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
|
seq_puts(s, "[UNREPLIED] ");
|
|
print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple, l4proto);
|
|
ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);
|
|
if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
|
goto release;
|
|
if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
|
seq_puts(s, "[OFFLOAD] ");
|
else if (test_bit(IPS_ASSURED_BIT, &ct->status))
|
seq_puts(s, "[ASSURED] ");
|
|
if (seq_has_overflowed(s))
|
goto release;
|
|
#if defined(CONFIG_NF_CONNTRACK_MARK)
|
seq_printf(s, "mark=%u ", ct->mark);
|
#endif
|
|
ct_show_secctx(s, ct);
|
ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
|
ct_show_delta_time(s, ct);
|
|
seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
|
|
if (seq_has_overflowed(s))
|
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 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);
|
}
|
(*pos)++;
|
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_puts(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,
|
0,
|
st->found,
|
0,
|
st->invalid,
|
st->ignore,
|
0,
|
0,
|
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 nf_conntrack_standalone_init_proc(struct net *net)
|
{
|
struct proc_dir_entry *pde;
|
kuid_t root_uid;
|
kgid_t root_gid;
|
|
pde = proc_create_net("nf_conntrack", 0440, net->proc_net, &ct_seq_ops,
|
sizeof(struct ct_iter_state));
|
if (!pde)
|
goto out_nf_conntrack;
|
|
root_uid = make_kuid(net->user_ns, 0);
|
root_gid = make_kgid(net->user_ns, 0);
|
if (uid_valid(root_uid) && gid_valid(root_gid))
|
proc_set_user(pde, root_uid, root_gid);
|
|
pde = proc_create_net("nf_conntrack", 0444, net->proc_net_stat,
|
&ct_cpu_seq_ops, sizeof(struct seq_net_private));
|
if (!pde)
|
goto out_stat_nf_conntrack;
|
return 0;
|
|
out_stat_nf_conntrack:
|
remove_proc_entry("nf_conntrack", net->proc_net);
|
out_nf_conntrack:
|
return -ENOMEM;
|
}
|
|
static void nf_conntrack_standalone_fini_proc(struct net *net)
|
{
|
remove_proc_entry("nf_conntrack", net->proc_net_stat);
|
remove_proc_entry("nf_conntrack", net->proc_net);
|
}
|
#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_NF_CONNTRACK_PROCFS */
|
|
/* Sysctl support */
|
|
#ifdef CONFIG_SYSCTL
|
/* Log invalid packets of a given protocol */
|
static int log_invalid_proto_min __read_mostly;
|
static int log_invalid_proto_max __read_mostly = 255;
|
|
/* size the user *wants to set */
|
static unsigned int nf_conntrack_htable_size_user __read_mostly;
|
|
static int
|
nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
{
|
int ret;
|
|
/* module_param hashsize could have changed value */
|
nf_conntrack_htable_size_user = nf_conntrack_htable_size;
|
|
ret = proc_dointvec(table, write, buffer, lenp, ppos);
|
if (ret < 0 || !write)
|
return ret;
|
|
/* update ret, we might not be able to satisfy request */
|
ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
|
|
/* update it to the actual value used by conntrack */
|
nf_conntrack_htable_size_user = nf_conntrack_htable_size;
|
return ret;
|
}
|
|
static struct ctl_table_header *nf_ct_netfilter_header;
|
|
static struct 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 = &nf_conntrack_htable_size_user,
|
.maxlen = sizeof(unsigned int),
|
.mode = 0644,
|
.proc_handler = nf_conntrack_hash_sysctl,
|
},
|
{
|
.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,
|
},
|
{ }
|
};
|
|
static struct ctl_table nf_ct_netfilter_table[] = {
|
{
|
.procname = "nf_conntrack_max",
|
.data = &nf_conntrack_max,
|
.maxlen = sizeof(int),
|
.mode = 0644,
|
.proc_handler = proc_dointvec,
|
},
|
{ }
|
};
|
|
static int nf_conntrack_standalone_init_sysctl(struct net *net)
|
{
|
struct ctl_table *table;
|
|
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[3].data = &net->ct.sysctl_checksum;
|
table[4].data = &net->ct.sysctl_log_invalid;
|
|
/* Don't export sysctls to unprivileged users */
|
if (net->user_ns != &init_user_ns)
|
table[0].procname = NULL;
|
|
if (!net_eq(&init_net, net)) {
|
table[0].mode = 0444;
|
table[2].mode = 0444;
|
table[5].mode = 0444;
|
}
|
|
net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
|
if (!net->ct.sysctl_header)
|
goto out_unregister_netfilter;
|
|
return 0;
|
|
out_unregister_netfilter:
|
kfree(table);
|
out_kmemdup:
|
return -ENOMEM;
|
}
|
|
static void nf_conntrack_standalone_fini_sysctl(struct net *net)
|
{
|
struct ctl_table *table;
|
|
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_pernet_init(struct net *net)
|
{
|
int ret;
|
|
ret = nf_conntrack_init_net(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(net);
|
out_init:
|
return ret;
|
}
|
|
static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
|
{
|
struct net *net;
|
|
list_for_each_entry(net, net_exit_list, exit_list) {
|
nf_conntrack_standalone_fini_sysctl(net);
|
nf_conntrack_standalone_fini_proc(net);
|
}
|
nf_conntrack_cleanup_net_list(net_exit_list);
|
}
|
|
static struct pernet_operations nf_conntrack_net_ops = {
|
.init = nf_conntrack_pernet_init,
|
.exit_batch = nf_conntrack_pernet_exit,
|
.id = &nf_conntrack_net_id,
|
.size = sizeof(struct nf_conntrack_net),
|
};
|
|
static int __init nf_conntrack_standalone_init(void)
|
{
|
int ret = nf_conntrack_init_start();
|
if (ret < 0)
|
goto out_start;
|
|
BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
|
BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);
|
|
#ifdef CONFIG_SYSCTL
|
nf_ct_netfilter_header =
|
register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
|
if (!nf_ct_netfilter_header) {
|
pr_err("nf_conntrack: can't register to sysctl.\n");
|
ret = -ENOMEM;
|
goto out_sysctl;
|
}
|
|
nf_conntrack_htable_size_user = nf_conntrack_htable_size;
|
#endif
|
|
ret = register_pernet_subsys(&nf_conntrack_net_ops);
|
if (ret < 0)
|
goto out_pernet;
|
|
nf_conntrack_init_end();
|
return 0;
|
|
out_pernet:
|
#ifdef CONFIG_SYSCTL
|
unregister_net_sysctl_table(nf_ct_netfilter_header);
|
out_sysctl:
|
#endif
|
nf_conntrack_cleanup_end();
|
out_start:
|
return ret;
|
}
|
|
static void __exit nf_conntrack_standalone_fini(void)
|
{
|
nf_conntrack_cleanup_start();
|
unregister_pernet_subsys(&nf_conntrack_net_ops);
|
#ifdef CONFIG_SYSCTL
|
unregister_net_sysctl_table(nf_ct_netfilter_header);
|
#endif
|
nf_conntrack_cleanup_end();
|
}
|
|
#ifdef CONFIG_ROCKCHIP_THUNDER_BOOT
|
rootfs_initcall(nf_conntrack_standalone_init);
|
#else
|
module_init(nf_conntrack_standalone_init);
|
#endif
|
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);
|
