#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_log.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.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>
static bool enable_hooks __read_mostly;
MODULE_PARM_DESC(enable_hooks, "Always enable conntrack hooks");
module_param(enable_hooks, bool, 0000);
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;
default:
break;
}
switch (l4proto->l4proto) {
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:
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_SCTP:
seq_printf(s, "sport=%hu dport=%hu ",
ntohs(tuple->src.u.sctp.port),
ntohs(tuple->dst.u.sctp.port));
break;
case IPPROTO_ICMPV6:
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_GRE:
seq_printf(s, "srckey=0x%x dstkey=0x%x ",
ntohs(tuple->src.u.gre.key),
ntohs(tuple->dst.u.gre.key));
break;
default:
break;
}
}
EXPORT_SYMBOL_GPL(print_tuple);
struct ct_iter_state {
struct seq_net_private p;
struct hlist_nulls_head *hash;
unsigned int htable_size;
unsigned int skip_elems;
unsigned int bucket;
u_int64_t time_now;
};
static struct nf_conntrack_tuple_hash *ct_get_next(const struct net *net,
struct ct_iter_state *st)
{
struct nf_conntrack_tuple_hash *h;
struct hlist_nulls_node *n;
unsigned int i;
for (i = st->bucket; i < st->htable_size; i++) {
unsigned int skip = 0;
restart:
hlist_nulls_for_each_entry_rcu(h, n, &st->hash[i], hnnode) {
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
struct hlist_nulls_node *tmp = n;
if (!net_eq(net, nf_ct_net(ct)))
continue;
if (++skip <= st->skip_elems)
continue;
while (!is_a_nulls(tmp))
tmp = rcu_dereference(hlist_nulls_next_rcu(tmp));
if (get_nulls_value(tmp) != i) {
skip = 0;
goto restart;
}
st->skip_elems = skip;
st->bucket = i;
return h;
}
skip = 0;
if (get_nulls_value(n) != i)
goto restart;
st->skip_elems = 0;
}
st->bucket = i;
return NULL;
}
static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(RCU)
{
struct ct_iter_state *st = seq->private;
struct net *net = seq_file_net(seq);
st->time_now = ktime_get_real_ns();
rcu_read_lock();
nf_conntrack_get_ht(&st->hash, &st->htable_size);
if (*pos == 0) {
st->skip_elems = 0;
st->bucket = 0;
} else if (st->skip_elems) {
st->skip_elems--;
}
return ct_get_next(net, st);
}
static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct ct_iter_state *st = s->private;
struct net *net = seq_file_net(s);
(*pos)++;
return ct_get_next(net, st);
}
static void ct_seq_stop(struct seq_file *s, void *v)
__releases(RCU)
{
rcu_read_unlock();
}
#ifdef CONFIG_NF_CONNTRACK_SECMARK
static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
struct lsm_context ctx;
int ret;
ret = security_secid_to_secctx(ct->secmark, &ctx);
if (ret < 0)
return;
seq_printf(s, "secctx=%s ", ctx.context);
security_release_secctx(&ctx);
}
#else
static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
}
#endif
#ifdef CONFIG_NF_CONNTRACK_ZONES
static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
int dir)
{
const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
if (zone->dir != dir)
return;
switch (zone->dir) {
case NF_CT_DEFAULT_ZONE_DIR:
seq_printf(s, "zone=%u ", zone->id);
break;
case NF_CT_ZONE_DIR_ORIG:
seq_printf(s, "zone-orig=%u ", zone->id);
break;
case NF_CT_ZONE_DIR_REPL:
seq_printf(s, "zone-reply=%u ", zone->id);
break;
default:
break;
}
}
#else
static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
int dir)
{
}
#endif
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
static void 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;
seq_printf(s, "delta-time=%llu ",
(unsigned long long)delta_time);
}
return;
}
#else
static inline void
ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
{
}
#endif
static const char* l3proto_name(u16 proto)
{
switch (proto) {
case AF_INET: return "ipv4";
case AF_INET6: return "ipv6";
}
return "unknown";
}
static const char* l4proto_name(u16 proto)
{
switch (proto) {
case IPPROTO_ICMP: return "icmp";
case IPPROTO_TCP: return "tcp";
case IPPROTO_UDP: return "udp";
case IPPROTO_GRE: return "gre";
case IPPROTO_SCTP: return "sctp";
case IPPROTO_UDPLITE: return "udplite";
case IPPROTO_ICMPV6: return "icmpv6";
}
return "unknown";
}
static void
seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
{
struct nf_conn_acct *acct;
struct nf_conn_counter *counter;
acct = nf_conn_acct_find(ct);
if (!acct)
return;
counter = acct->counter;
seq_printf(s, "packets=%llu bytes=%llu ",
(unsigned long long)atomic64_read(&counter[dir].packets),
(unsigned long long)atomic64_read(&counter[dir].bytes));
}
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_l4proto *l4proto;
struct net *net = seq_file_net(s);
int ret = 0;
WARN_ON(!ct);
if (unlikely(!refcount_inc_not_zero(&ct->ct_general.use)))
return 0;
smp_acquire__after_ctrl_dep();
if (nf_ct_should_gc(ct)) {
struct ct_iter_state *st = s->private;
st->skip_elems--;
nf_ct_kill(ct);
goto release;
}
if (NF_CT_DIRECTION(hash))
goto release;
if (!net_eq(nf_ct_net(ct), net))
goto release;
l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
ret = -ENOSPC;
seq_printf(s, "%-8s %u %-8s %u ",
l3proto_name(nf_ct_l3num(ct)), nf_ct_l3num(ct),
l4proto_name(l4proto->l4proto), nf_ct_protonum(ct));
if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
seq_printf(s, "%ld ", nf_ct_expires(ct) / HZ);
if (l4proto->print_conntrack)
l4proto->print_conntrack(s, ct);
print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
l4proto);
ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);
if (seq_has_overflowed(s))
goto release;
seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL);
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);
seq_print_acct(s, ct, IP_CT_DIR_REPLY);
if (test_bit(IPS_HW_OFFLOAD_BIT, &ct->status))
seq_puts(s, "[HW_OFFLOAD] ");
else 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 ", READ_ONCE(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", refcount_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);
const struct ip_conntrack_stat *st = v;
unsigned int nr_conntracks;
if (v == SEQ_START_TOKEN) {
seq_puts(seq, "entries clashres found new invalid ignore delete chainlength insert insert_failed drop early_drop icmp_error expect_new expect_create expect_delete search_restart\n");
return 0;
}
nr_conntracks = nf_conntrack_count(net);
seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x "
"%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
nr_conntracks,
st->clash_resolve,
st->found,
0,
st->invalid,
0,
0,
st->chaintoolong,
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
u32 nf_conntrack_count(const struct net *net)
{
const struct nf_conntrack_net *cnet = nf_ct_pernet(net);
return atomic_read(&cnet->count);
}
EXPORT_SYMBOL_GPL(nf_conntrack_count);
#ifdef CONFIG_SYSCTL
static unsigned int nf_conntrack_htable_size_user __read_mostly;
static int
nf_conntrack_hash_sysctl(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret;
nf_conntrack_htable_size_user = nf_conntrack_htable_size;
ret = proc_dointvec(table, write, buffer, lenp, ppos);
if (ret < 0 || !write)
return ret;
ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);
nf_conntrack_htable_size_user = nf_conntrack_htable_size;
return ret;
}
static int
nf_conntrack_log_invalid_sysctl(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int ret, i;
ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
if (ret < 0 || !write)
return ret;
if (*(u8 *)table->data == 0)
return 0;
for (i = 0; i < NFPROTO_NUMPROTO; i++) {
if (nf_log_is_registered(i))
return 0;
}
request_module("%s", "nf_log_syslog");
return 0;
}
static struct ctl_table_header *nf_ct_netfilter_header;
enum nf_ct_sysctl_index {
NF_SYSCTL_CT_MAX,
NF_SYSCTL_CT_COUNT,
NF_SYSCTL_CT_BUCKETS,
NF_SYSCTL_CT_CHECKSUM,
NF_SYSCTL_CT_LOG_INVALID,
NF_SYSCTL_CT_EXPECT_MAX,
NF_SYSCTL_CT_ACCT,
#ifdef CONFIG_NF_CONNTRACK_EVENTS
NF_SYSCTL_CT_EVENTS,
#endif
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
NF_SYSCTL_CT_TIMESTAMP,
#endif
NF_SYSCTL_CT_PROTO_TIMEOUT_GENERIC,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_SYN_SENT,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_SYN_RECV,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_ESTABLISHED,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_FIN_WAIT,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_CLOSE_WAIT,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_LAST_ACK,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_TIME_WAIT,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_CLOSE,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_RETRANS,
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_UNACK,
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD,
#endif
NF_SYSCTL_CT_PROTO_TCP_LOOSE,
NF_SYSCTL_CT_PROTO_TCP_LIBERAL,
NF_SYSCTL_CT_PROTO_TCP_IGNORE_INVALID_RST,
NF_SYSCTL_CT_PROTO_TCP_MAX_RETRANS,
NF_SYSCTL_CT_PROTO_TIMEOUT_UDP,
NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM,
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD,
#endif
NF_SYSCTL_CT_PROTO_TIMEOUT_ICMP,
NF_SYSCTL_CT_PROTO_TIMEOUT_ICMPV6,
#ifdef CONFIG_NF_CT_PROTO_SCTP
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_CLOSED,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_COOKIE_WAIT,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_COOKIE_ECHOED,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_ESTABLISHED,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_SENT,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_RECD,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_SENT,
#endif
#ifdef CONFIG_NF_CT_PROTO_GRE
NF_SYSCTL_CT_PROTO_TIMEOUT_GRE,
NF_SYSCTL_CT_PROTO_TIMEOUT_GRE_STREAM,
#endif
NF_SYSCTL_CT_LAST_SYSCTL,
};
static struct ctl_table nf_ct_sysctl_table[] = {
[NF_SYSCTL_CT_MAX] = {
.procname = "nf_conntrack_max",
.data = &nf_conntrack_max,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ONE,
.extra2 = SYSCTL_INT_MAX,
},
[NF_SYSCTL_CT_COUNT] = {
.procname = "nf_conntrack_count",
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = proc_dointvec,
},
[NF_SYSCTL_CT_BUCKETS] = {
.procname = "nf_conntrack_buckets",
.data = &nf_conntrack_htable_size_user,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = nf_conntrack_hash_sysctl,
},
[NF_SYSCTL_CT_CHECKSUM] = {
.procname = "nf_conntrack_checksum",
.data = &init_net.ct.sysctl_checksum,
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
[NF_SYSCTL_CT_LOG_INVALID] = {
.procname = "nf_conntrack_log_invalid",
.data = &init_net.ct.sysctl_log_invalid,
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = nf_conntrack_log_invalid_sysctl,
},
[NF_SYSCTL_CT_EXPECT_MAX] = {
.procname = "nf_conntrack_expect_max",
.data = &nf_ct_expect_max,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ONE,
.extra2 = SYSCTL_INT_MAX,
},
[NF_SYSCTL_CT_ACCT] = {
.procname = "nf_conntrack_acct",
.data = &init_net.ct.sysctl_acct,
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#ifdef CONFIG_NF_CONNTRACK_EVENTS
[NF_SYSCTL_CT_EVENTS] = {
.procname = "nf_conntrack_events",
.data = &init_net.ct.sysctl_events,
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_TWO,
},
#endif
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
[NF_SYSCTL_CT_TIMESTAMP] = {
.procname = "nf_conntrack_timestamp",
.data = &init_net.ct.sysctl_tstamp,
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif
[NF_SYSCTL_CT_PROTO_TIMEOUT_GENERIC] = {
.procname = "nf_conntrack_generic_timeout",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_SYN_SENT] = {
.procname = "nf_conntrack_tcp_timeout_syn_sent",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_SYN_RECV] = {
.procname = "nf_conntrack_tcp_timeout_syn_recv",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_ESTABLISHED] = {
.procname = "nf_conntrack_tcp_timeout_established",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_FIN_WAIT] = {
.procname = "nf_conntrack_tcp_timeout_fin_wait",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_CLOSE_WAIT] = {
.procname = "nf_conntrack_tcp_timeout_close_wait",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_LAST_ACK] = {
.procname = "nf_conntrack_tcp_timeout_last_ack",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_TIME_WAIT] = {
.procname = "nf_conntrack_tcp_timeout_time_wait",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_CLOSE] = {
.procname = "nf_conntrack_tcp_timeout_close",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_RETRANS] = {
.procname = "nf_conntrack_tcp_timeout_max_retrans",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_UNACK] = {
.procname = "nf_conntrack_tcp_timeout_unacknowledged",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD] = {
.procname = "nf_flowtable_tcp_timeout",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#endif
[NF_SYSCTL_CT_PROTO_TCP_LOOSE] = {
.procname = "nf_conntrack_tcp_loose",
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
[NF_SYSCTL_CT_PROTO_TCP_LIBERAL] = {
.procname = "nf_conntrack_tcp_be_liberal",
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
[NF_SYSCTL_CT_PROTO_TCP_IGNORE_INVALID_RST] = {
.procname = "nf_conntrack_tcp_ignore_invalid_rst",
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
[NF_SYSCTL_CT_PROTO_TCP_MAX_RETRANS] = {
.procname = "nf_conntrack_tcp_max_retrans",
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP] = {
.procname = "nf_conntrack_udp_timeout",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM] = {
.procname = "nf_conntrack_udp_timeout_stream",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD] = {
.procname = "nf_flowtable_udp_timeout",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#endif
[NF_SYSCTL_CT_PROTO_TIMEOUT_ICMP] = {
.procname = "nf_conntrack_icmp_timeout",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_ICMPV6] = {
.procname = "nf_conntrack_icmpv6_timeout",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#ifdef CONFIG_NF_CT_PROTO_SCTP
[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_CLOSED] = {
.procname = "nf_conntrack_sctp_timeout_closed",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_COOKIE_WAIT] = {
.procname = "nf_conntrack_sctp_timeout_cookie_wait",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_COOKIE_ECHOED] = {
.procname = "nf_conntrack_sctp_timeout_cookie_echoed",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_ESTABLISHED] = {
.procname = "nf_conntrack_sctp_timeout_established",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_SENT] = {
.procname = "nf_conntrack_sctp_timeout_shutdown_sent",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_RECD] = {
.procname = "nf_conntrack_sctp_timeout_shutdown_recd",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = {
.procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_SENT] = {
.procname = "nf_conntrack_sctp_timeout_heartbeat_sent",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#endif
#ifdef CONFIG_NF_CT_PROTO_GRE
[NF_SYSCTL_CT_PROTO_TIMEOUT_GRE] = {
.procname = "nf_conntrack_gre_timeout",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
[NF_SYSCTL_CT_PROTO_TIMEOUT_GRE_STREAM] = {
.procname = "nf_conntrack_gre_timeout_stream",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#endif
};
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_minmax,
.extra1 = SYSCTL_ONE,
.extra2 = SYSCTL_INT_MAX,
},
};
static void nf_conntrack_standalone_init_tcp_sysctl(struct net *net,
struct ctl_table *table)
{
struct nf_tcp_net *tn = nf_tcp_pernet(net);
#define XASSIGN(XNAME, tn) \
table[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_ ## XNAME].data = \
&(tn)->timeouts[TCP_CONNTRACK_ ## XNAME]
XASSIGN(SYN_SENT, tn);
XASSIGN(SYN_RECV, tn);
XASSIGN(ESTABLISHED, tn);
XASSIGN(FIN_WAIT, tn);
XASSIGN(CLOSE_WAIT, tn);
XASSIGN(LAST_ACK, tn);
XASSIGN(TIME_WAIT, tn);
XASSIGN(CLOSE, tn);
XASSIGN(RETRANS, tn);
XASSIGN(UNACK, tn);
#undef XASSIGN
#define XASSIGN(XNAME, rval) \
table[NF_SYSCTL_CT_PROTO_TCP_ ## XNAME].data = (rval)
XASSIGN(LOOSE, &tn->tcp_loose);
XASSIGN(LIBERAL, &tn->tcp_be_liberal);
XASSIGN(MAX_RETRANS, &tn->tcp_max_retrans);
XASSIGN(IGNORE_INVALID_RST, &tn->tcp_ignore_invalid_rst);
#undef XASSIGN
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
table[NF_SYSCTL_CT_PROTO_TIMEOUT_TCP_OFFLOAD].data = &tn->offload_timeout;
#endif
}
static void nf_conntrack_standalone_init_sctp_sysctl(struct net *net,
struct ctl_table *table)
{
#ifdef CONFIG_NF_CT_PROTO_SCTP
struct nf_sctp_net *sn = nf_sctp_pernet(net);
#define XASSIGN(XNAME, sn) \
table[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_ ## XNAME].data = \
&(sn)->timeouts[SCTP_CONNTRACK_ ## XNAME]
XASSIGN(CLOSED, sn);
XASSIGN(COOKIE_WAIT, sn);
XASSIGN(COOKIE_ECHOED, sn);
XASSIGN(ESTABLISHED, sn);
XASSIGN(SHUTDOWN_SENT, sn);
XASSIGN(SHUTDOWN_RECD, sn);
XASSIGN(SHUTDOWN_ACK_SENT, sn);
XASSIGN(HEARTBEAT_SENT, sn);
#undef XASSIGN
#endif
}
static void nf_conntrack_standalone_init_gre_sysctl(struct net *net,
struct ctl_table *table)
{
#ifdef CONFIG_NF_CT_PROTO_GRE
struct nf_gre_net *gn = nf_gre_pernet(net);
table[NF_SYSCTL_CT_PROTO_TIMEOUT_GRE].data = &gn->timeouts[GRE_CT_UNREPLIED];
table[NF_SYSCTL_CT_PROTO_TIMEOUT_GRE_STREAM].data = &gn->timeouts[GRE_CT_REPLIED];
#endif
}
static int nf_conntrack_standalone_init_sysctl(struct net *net)
{
struct nf_conntrack_net *cnet = nf_ct_pernet(net);
struct nf_udp_net *un = nf_udp_pernet(net);
struct ctl_table *table;
BUILD_BUG_ON(ARRAY_SIZE(nf_ct_sysctl_table) != NF_SYSCTL_CT_LAST_SYSCTL);
table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
GFP_KERNEL);
if (!table)
return -ENOMEM;
table[NF_SYSCTL_CT_COUNT].data = &cnet->count;
table[NF_SYSCTL_CT_CHECKSUM].data = &net->ct.sysctl_checksum;
table[NF_SYSCTL_CT_LOG_INVALID].data = &net->ct.sysctl_log_invalid;
table[NF_SYSCTL_CT_ACCT].data = &net->ct.sysctl_acct;
#ifdef CONFIG_NF_CONNTRACK_EVENTS
table[NF_SYSCTL_CT_EVENTS].data = &net->ct.sysctl_events;
#endif
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
table[NF_SYSCTL_CT_TIMESTAMP].data = &net->ct.sysctl_tstamp;
#endif
table[NF_SYSCTL_CT_PROTO_TIMEOUT_GENERIC].data = &nf_generic_pernet(net)->timeout;
table[NF_SYSCTL_CT_PROTO_TIMEOUT_ICMP].data = &nf_icmp_pernet(net)->timeout;
table[NF_SYSCTL_CT_PROTO_TIMEOUT_ICMPV6].data = &nf_icmpv6_pernet(net)->timeout;
table[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP].data = &un->timeouts[UDP_CT_UNREPLIED];
table[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM].data = &un->timeouts[UDP_CT_REPLIED];
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
table[NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_OFFLOAD].data = &un->offload_timeout;
#endif
nf_conntrack_standalone_init_tcp_sysctl(net, table);
nf_conntrack_standalone_init_sctp_sysctl(net, table);
nf_conntrack_standalone_init_gre_sysctl(net, table);
if (!net_eq(&init_net, net)) {
table[NF_SYSCTL_CT_MAX].mode = 0444;
table[NF_SYSCTL_CT_EXPECT_MAX].mode = 0444;
table[NF_SYSCTL_CT_BUCKETS].mode = 0444;
}
cnet->sysctl_header = register_net_sysctl_sz(net, "net/netfilter",
table,
ARRAY_SIZE(nf_ct_sysctl_table));
if (!cnet->sysctl_header)
goto out_unregister_netfilter;
return 0;
out_unregister_netfilter:
kfree(table);
return -ENOMEM;
}
static void nf_conntrack_standalone_fini_sysctl(struct net *net)
{
struct nf_conntrack_net *cnet = nf_ct_pernet(net);
const struct ctl_table *table;
table = cnet->sysctl_header->ctl_table_arg;
unregister_net_sysctl_table(cnet->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
static void nf_conntrack_fini_net(struct net *net)
{
if (enable_hooks)
nf_ct_netns_put(net, NFPROTO_INET);
nf_conntrack_standalone_fini_proc(net);
nf_conntrack_standalone_fini_sysctl(net);
}
static int nf_conntrack_pernet_init(struct net *net)
{
int ret;
net->ct.sysctl_checksum = 1;
ret = nf_conntrack_standalone_init_sysctl(net);
if (ret < 0)
return ret;
ret = nf_conntrack_standalone_init_proc(net);
if (ret < 0)
goto out_proc;
ret = nf_conntrack_init_net(net);
if (ret < 0)
goto out_init_net;
if (enable_hooks) {
ret = nf_ct_netns_get(net, NFPROTO_INET);
if (ret < 0)
goto out_hooks;
}
return 0;
out_hooks:
nf_conntrack_cleanup_net(net);
out_init_net:
nf_conntrack_standalone_fini_proc(net);
out_proc:
nf_conntrack_standalone_fini_sysctl(net);
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_fini_net(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(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
nf_conntrack_init_end();
ret = register_pernet_subsys(&nf_conntrack_net_ops);
if (ret < 0)
goto out_pernet;
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();
}
module_init(nf_conntrack_standalone_init);
module_exit(nf_conntrack_standalone_fini);
