/net/netfilter/nf_conntrack_standalone.c
http://github.com/mirrors/linux · C · 1209 lines · 1060 code · 140 blank · 9 comment · 65 complexity · ddb0a36fe6123703da397ffb52c0db84 MD5 · raw file
- // SPDX-License-Identifier: GPL-2.0
- #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_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: /* 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;
- 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 bucket;
- u_int64_t time_now;
- };
- static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
- {
- struct ct_iter_state *st = seq->private;
- struct hlist_nulls_node *n;
- for (st->bucket = 0;
- st->bucket < st->htable_size;
- st->bucket++) {
- n = rcu_dereference(
- hlist_nulls_first_rcu(&st->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 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 >= st->htable_size)
- return NULL;
- }
- head = rcu_dereference(
- hlist_nulls_first_rcu(&st->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_get_real_ns();
- rcu_read_lock();
- nf_conntrack_get_ht(&st->hash, &st->htable_size);
- 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 void 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;
- seq_printf(s, "secctx=%s ", secctx);
- security_release_secctx(secctx, len);
- }
- #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_DCCP: return "dccp";
- case IPPROTO_GRE: return "gre";
- case IPPROTO_SCTP: return "sctp";
- case IPPROTO_UDPLITE: return "udplite";
- }
- return "unknown";
- }
- static unsigned int
- 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 0;
- 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));
- return 0;
- }
- /* 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_l4proto *l4proto;
- struct net *net = seq_file_net(s);
- int ret = 0;
- WARN_ON(!ct);
- if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
- return 0;
- if (nf_ct_should_gc(ct)) {
- nf_ct_kill(ct);
- goto release;
- }
- /* we only want to print DIR_ORIGINAL */
- 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;
- 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;
- 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;
- 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,
- NF_SYSCTL_CT_HELPER,
- #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,
- NF_SYSCTL_CT_PROTO_TCP_LOOSE,
- NF_SYSCTL_CT_PROTO_TCP_LIBERAL,
- NF_SYSCTL_CT_PROTO_TCP_MAX_RETRANS,
- NF_SYSCTL_CT_PROTO_TIMEOUT_UDP,
- NF_SYSCTL_CT_PROTO_TIMEOUT_UDP_STREAM,
- 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,
- NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_ACKED,
- #endif
- #ifdef CONFIG_NF_CT_PROTO_DCCP
- NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_REQUEST,
- NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_RESPOND,
- NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_PARTOPEN,
- NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_OPEN,
- NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_CLOSEREQ,
- NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_CLOSING,
- NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_TIMEWAIT,
- NF_SYSCTL_CT_PROTO_DCCP_LOOSE,
- #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,
- };
- #define NF_SYSCTL_CT_LAST_SYSCTL (__NF_SYSCTL_CT_LAST_SYSCTL + 1)
- 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,
- },
- [NF_SYSCTL_CT_COUNT] = {
- .procname = "nf_conntrack_count",
- .data = &init_net.ct.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(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_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(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &log_invalid_proto_min,
- .extra2 = &log_invalid_proto_max,
- },
- [NF_SYSCTL_CT_EXPECT_MAX] = {
- .procname = "nf_conntrack_expect_max",
- .data = &nf_ct_expect_max,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- [NF_SYSCTL_CT_ACCT] = {
- .procname = "nf_conntrack_acct",
- .data = &init_net.ct.sysctl_acct,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- [NF_SYSCTL_CT_HELPER] = {
- .procname = "nf_conntrack_helper",
- .data = &init_net.ct.sysctl_auto_assign_helper,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_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(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- #endif
- #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
- [NF_SYSCTL_CT_TIMESTAMP] = {
- .procname = "nf_conntrack_timestamp",
- .data = &init_net.ct.sysctl_tstamp,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_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,
- },
- [NF_SYSCTL_CT_PROTO_TCP_LOOSE] = {
- .procname = "nf_conntrack_tcp_loose",
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- [NF_SYSCTL_CT_PROTO_TCP_LIBERAL] = {
- .procname = "nf_conntrack_tcp_be_liberal",
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- [NF_SYSCTL_CT_PROTO_TCP_MAX_RETRANS] = {
- .procname = "nf_conntrack_tcp_max_retrans",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- [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,
- },
- [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,
- },
- [NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_ACKED] = {
- .procname = "nf_conntrack_sctp_timeout_heartbeat_acked",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- #endif
- #ifdef CONFIG_NF_CT_PROTO_DCCP
- [NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_REQUEST] = {
- .procname = "nf_conntrack_dccp_timeout_request",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- [NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_RESPOND] = {
- .procname = "nf_conntrack_dccp_timeout_respond",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- [NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_PARTOPEN] = {
- .procname = "nf_conntrack_dccp_timeout_partopen",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- [NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_OPEN] = {
- .procname = "nf_conntrack_dccp_timeout_open",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- [NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_CLOSEREQ] = {
- .procname = "nf_conntrack_dccp_timeout_closereq",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- [NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_CLOSING] = {
- .procname = "nf_conntrack_dccp_timeout_closing",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- [NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_TIMEWAIT] = {
- .procname = "nf_conntrack_dccp_timeout_timewait",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- [NF_SYSCTL_CT_PROTO_DCCP_LOOSE] = {
- .procname = "nf_conntrack_dccp_loose",
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- #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,
- },
- { }
- };
- 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);
- #undef XASSIGN
- }
- 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);
- XASSIGN(HEARTBEAT_ACKED, sn);
- #undef XASSIGN
- #endif
- }
- static void nf_conntrack_standalone_init_dccp_sysctl(struct net *net,
- struct ctl_table *table)
- {
- #ifdef CONFIG_NF_CT_PROTO_DCCP
- struct nf_dccp_net *dn = nf_dccp_pernet(net);
- #define XASSIGN(XNAME, dn) \
- table[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_ ## XNAME].data = \
- &(dn)->dccp_timeout[CT_DCCP_ ## XNAME]
- XASSIGN(REQUEST, dn);
- XASSIGN(RESPOND, dn);
- XASSIGN(PARTOPEN, dn);
- XASSIGN(OPEN, dn);
- XASSIGN(CLOSEREQ, dn);
- XASSIGN(CLOSING, dn);
- XASSIGN(TIMEWAIT, dn);
- #undef XASSIGN
- table[NF_SYSCTL_CT_PROTO_DCCP_LOOSE].data = &dn->dccp_loose;
- #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_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 = &net->ct.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;
- table[NF_SYSCTL_CT_HELPER].data = &net->ct.sysctl_auto_assign_helper;
- #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];
- nf_conntrack_standalone_init_tcp_sysctl(net, table);
- nf_conntrack_standalone_init_sctp_sysctl(net, table);
- nf_conntrack_standalone_init_dccp_sysctl(net, table);
- nf_conntrack_standalone_init_gre_sysctl(net, table);
- /* Don't allow unprivileged users to alter certain sysctls */
- if (net->user_ns != &init_user_ns) {
- table[NF_SYSCTL_CT_MAX].mode = 0444;
- table[NF_SYSCTL_CT_EXPECT_MAX].mode = 0444;
- table[NF_SYSCTL_CT_HELPER].mode = 0444;
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- table[NF_SYSCTL_CT_EVENTS].mode = 0444;
- #endif
- table[NF_SYSCTL_CT_BUCKETS].mode = 0444;
- } else if (!net_eq(&init_net, net)) {
- table[NF_SYSCTL_CT_BUCKETS].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);
- 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 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
- 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();
- }
- module_init(nf_conntrack_standalone_init);
- module_exit(nf_conntrack_standalone_fini);