[NETFILTER]: nf_conntrack: sysctl compatibility with old connection tracking

This patch adds an option to keep the connection tracking sysctls visible
under their old names.

Signed-off-by: Patrick McHardy <kaber@trash.net>

9 files changed, 327 insertions, 0 deletions

diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index d88c292f118c..4ac5b5c4678d 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -19,6 +19,17 @@ config NF_CONNTRACK_IPV4
 
           To compile it as a module, choose M here.  If unsure, say N.
 
+config NF_CONNTRACK_PROC_COMPAT
+        bool "proc/sysctl compatibility with old connection tracking"
+        depends on NF_CONNTRACK
+        default y
+        help
+          This option enables /proc and sysctl compatibility with the old
+          layer 3 dependant connection tracking. This is needed to keep
+          old programs that have not been adapted to the new names working.
+
+          If unsure, say Y.
+
 # connection tracking, helpers and protocols
 config IP_NF_CONNTRACK
         tristate "Connection tracking (required for masq/NAT)"
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 786c4ce96cdf..bcec6822f2ee 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -266,6 +266,60 @@ static struct nf_hook_ops ipv4_conntrack_ops[] = {
         },
 };
 
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
+static int log_invalid_proto_min = 0;
+static int log_invalid_proto_max = 255;
+
+static ctl_table ip_ct_sysctl_table[] = {
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_MAX,
+                .procname       = "ip_conntrack_max",
+                .data           = &nf_conntrack_max,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_COUNT,
+                .procname       = "ip_conntrack_count",
+                .data           = &nf_conntrack_count,
+                .maxlen         = sizeof(int),
+                .mode           = 0444,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_BUCKETS,
+                .procname       = "ip_conntrack_buckets",
+                .data           = &nf_conntrack_htable_size,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0444,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_CHECKSUM,
+                .procname       = "ip_conntrack_checksum",
+                .data           = &nf_conntrack_checksum,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_LOG_INVALID,
+                .procname       = "ip_conntrack_log_invalid",
+                .data           = &nf_ct_log_invalid,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_minmax,
+                .strategy       = &sysctl_intvec,
+                .extra1         = &log_invalid_proto_min,
+                .extra2         = &log_invalid_proto_max,
+        },
+        {
+                .ctl_name       = 0
+        }
+};
+#endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */
+
 /* Fast function for those who don't want to parse /proc (and I don't
    blame them). */
 /* Reversing the socket's dst/src point of view gives us the reply
@@ -386,6 +440,10 @@ struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 = {
         .tuple_to_nfattr = ipv4_tuple_to_nfattr,
         .nfattr_to_tuple = ipv4_nfattr_to_tuple,
 #endif
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
+        .ctl_table_path  = nf_net_ipv4_netfilter_sysctl_path,
+        .ctl_table       = ip_ct_sysctl_table,
+#endif
         .me              = THIS_MODULE,
 };
 
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index c59f28193a39..46aa44abc078 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -336,6 +336,21 @@ static struct ctl_table icmp_sysctl_table[] = {
                 .ctl_name = 0
         }
 };
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table icmp_compat_sysctl_table[] = {
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_ICMP_TIMEOUT,
+                .procname       = "ip_conntrack_icmp_timeout",
+                .data           = &nf_ct_icmp_timeout,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name = 0
+        }
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 #endif /* CONFIG_SYSCTL */
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp =
@@ -360,6 +375,9 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp =
 #ifdef CONFIG_SYSCTL
         .ctl_table_header       = &icmp_sysctl_header,
         .ctl_table              = icmp_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+        .ctl_compat_table       = icmp_compat_sysctl_table,
+#endif
 #endif
 };
 
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 4b972791149d..a6728067780a 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -66,10 +66,12 @@ DEFINE_RWLOCK(nf_conntrack_lock);
 
 /* nf_conntrack_standalone needs this */
 atomic_t nf_conntrack_count = ATOMIC_INIT(0);
+EXPORT_SYMBOL_GPL(nf_conntrack_count);
 
 void (*nf_conntrack_destroyed)(struct nf_conn *conntrack) = NULL;
 unsigned int nf_conntrack_htable_size __read_mostly;
 int nf_conntrack_max __read_mostly;
+EXPORT_SYMBOL_GPL(nf_conntrack_max);
 struct list_head *nf_conntrack_hash __read_mostly;
 struct nf_conn nf_conntrack_untracked __read_mostly;
 unsigned int nf_ct_log_invalid __read_mostly;
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 891c9c56c319..4798afcbbb0d 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -250,7 +250,22 @@ static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto)
                                             nf_net_netfilter_sysctl_path,
                                             l4proto->ctl_table,
                                             l4proto->ctl_table_users);
+                if (err < 0)
+                        goto out;
         }
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+        if (l4proto->ctl_compat_table != NULL) {
+                err = nf_ct_register_sysctl(&l4proto->ctl_compat_table_header,
+                                            nf_net_ipv4_netfilter_sysctl_path,
+                                            l4proto->ctl_compat_table, NULL);
+                if (err == 0)
+                        goto out;
+                nf_ct_unregister_sysctl(l4proto->ctl_table_header,
+                                        l4proto->ctl_table,
+                                        l4proto->ctl_table_users);
+        }
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
+out:
         mutex_unlock(&nf_ct_proto_sysctl_mutex);
 #endif /* CONFIG_SYSCTL */
         return err;
@@ -265,6 +280,11 @@ static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto
                 nf_ct_unregister_sysctl(l4proto->ctl_table_header,
                                         l4proto->ctl_table,
                                         l4proto->ctl_table_users);
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+        if (l4proto->ctl_compat_table_header != NULL)
+                nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header,
+                                        l4proto->ctl_compat_table, NULL);
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
         mutex_unlock(&nf_ct_proto_sysctl_mutex);
 #endif /* CONFIG_SYSCTL */
 }
diff --git a/net/netfilter/nf_conntrack_proto_generic.c b/net/netfilter/nf_conntrack_proto_generic.c
index 15306b952510..69902531c236 100644
--- a/net/netfilter/nf_conntrack_proto_generic.c
+++ b/net/netfilter/nf_conntrack_proto_generic.c
@@ -86,6 +86,21 @@ static struct ctl_table generic_sysctl_table[] = {
                 .ctl_name       = 0
         }
 };
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table generic_compat_sysctl_table[] = {
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_GENERIC_TIMEOUT,
+                .procname       = "ip_conntrack_generic_timeout",
+                .data           = &nf_ct_generic_timeout,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = 0
+        }
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 #endif /* CONFIG_SYSCTL */
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
@@ -102,5 +117,8 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
 #ifdef CONFIG_SYSCTL
         .ctl_table_header       = &generic_sysctl_header,
         .ctl_table              = generic_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+        .ctl_compat_table       = generic_compat_sysctl_table,
+#endif
 #endif
 };
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index cc693308878f..7c64b9c1cf4a 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -573,6 +573,70 @@ static struct ctl_table sctp_sysctl_table[] = {
                 .ctl_name = 0
         }
 };
+
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table sctp_compat_sysctl_table[] = {
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
+                .procname       = "ip_conntrack_sctp_timeout_closed",
+                .data           = &nf_ct_sctp_timeout_closed,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
+                .procname       = "ip_conntrack_sctp_timeout_cookie_wait",
+                .data           = &nf_ct_sctp_timeout_cookie_wait,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
+                .procname       = "ip_conntrack_sctp_timeout_cookie_echoed",
+                .data           = &nf_ct_sctp_timeout_cookie_echoed,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
+                .procname       = "ip_conntrack_sctp_timeout_established",
+                .data           = &nf_ct_sctp_timeout_established,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
+                .procname       = "ip_conntrack_sctp_timeout_shutdown_sent",
+                .data           = &nf_ct_sctp_timeout_shutdown_sent,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
+                .procname       = "ip_conntrack_sctp_timeout_shutdown_recd",
+                .data           = &nf_ct_sctp_timeout_shutdown_recd,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
+                .procname       = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
+                .data           = &nf_ct_sctp_timeout_shutdown_ack_sent,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name = 0
+        }
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 #endif
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 = {
@@ -590,6 +654,9 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 = {
         .ctl_table_users        = &sctp_sysctl_table_users,
         .ctl_table_header       = &sctp_sysctl_header,
         .ctl_table              = sctp_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+        .ctl_compat_table       = sctp_compat_sysctl_table,
+#endif
 #endif
 };
 
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 6f6f9a061e76..d99c7c4176d4 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -1273,6 +1273,110 @@ static struct ctl_table tcp_sysctl_table[] = {
                 .ctl_name       = 0
         }
 };
+
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table tcp_compat_sysctl_table[] = {
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_SENT,
+                .procname       = "ip_conntrack_tcp_timeout_syn_sent",
+                .data           = &nf_ct_tcp_timeout_syn_sent,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_SYN_RECV,
+                .procname       = "ip_conntrack_tcp_timeout_syn_recv",
+                .data           = &nf_ct_tcp_timeout_syn_recv,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_ESTABLISHED,
+                .procname       = "ip_conntrack_tcp_timeout_established",
+                .data           = &nf_ct_tcp_timeout_established,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_FIN_WAIT,
+                .procname       = "ip_conntrack_tcp_timeout_fin_wait",
+                .data           = &nf_ct_tcp_timeout_fin_wait,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE_WAIT,
+                .procname       = "ip_conntrack_tcp_timeout_close_wait",
+                .data           = &nf_ct_tcp_timeout_close_wait,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_LAST_ACK,
+                .procname       = "ip_conntrack_tcp_timeout_last_ack",
+                .data           = &nf_ct_tcp_timeout_last_ack,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_TIME_WAIT,
+                .procname       = "ip_conntrack_tcp_timeout_time_wait",
+                .data           = &nf_ct_tcp_timeout_time_wait,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_CLOSE,
+                .procname       = "ip_conntrack_tcp_timeout_close",
+                .data           = &nf_ct_tcp_timeout_close,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_TIMEOUT_MAX_RETRANS,
+                .procname       = "ip_conntrack_tcp_timeout_max_retrans",
+                .data           = &nf_ct_tcp_timeout_max_retrans,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
+                .procname       = "ip_conntrack_tcp_loose",
+                .data           = &nf_ct_tcp_loose,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
+                .procname       = "ip_conntrack_tcp_be_liberal",
+                .data           = &nf_ct_tcp_be_liberal,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
+                .procname       = "ip_conntrack_tcp_max_retrans",
+                .data           = &nf_ct_tcp_max_retrans,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec,
+        },
+        {
+                .ctl_name       = 0
+        }
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 #endif /* CONFIG_SYSCTL */
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 =
@@ -1298,6 +1402,9 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 =
         .ctl_table_users        = &tcp_sysctl_table_users,
         .ctl_table_header       = &tcp_sysctl_header,
         .ctl_table              = tcp_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+        .ctl_compat_table       = tcp_compat_sysctl_table,
+#endif
 #endif
 };
 
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index d86749cb4a46..908fde7719f4 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -172,6 +172,29 @@ static struct ctl_table udp_sysctl_table[] = {
                 .ctl_name       = 0
         }
 };
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table udp_compat_sysctl_table[] = {
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT,
+                .procname       = "ip_conntrack_udp_timeout",
+                .data           = &nf_ct_udp_timeout,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = NET_IPV4_NF_CONNTRACK_UDP_TIMEOUT_STREAM,
+                .procname       = "ip_conntrack_udp_timeout_stream",
+                .data           = &nf_ct_udp_timeout_stream,
+                .maxlen         = sizeof(unsigned int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_jiffies,
+        },
+        {
+                .ctl_name       = 0
+        }
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 #endif /* CONFIG_SYSCTL */
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 =
@@ -195,6 +218,9 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 =
         .ctl_table_users        = &udp_sysctl_table_users,
         .ctl_table_header       = &udp_sysctl_header,
         .ctl_table              = udp_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+        .ctl_compat_table       = udp_compat_sysctl_table,
+#endif
 #endif
 };