diff options
| -rw-r--r-- | include/linux/netfilter/Kbuild | 1 | ||||
| -rw-r--r-- | include/linux/netfilter/nfnetlink.h | 3 | ||||
| -rw-r--r-- | include/linux/netfilter/nfnetlink_cttimeout.h | 114 | ||||
| -rw-r--r-- | include/net/netfilter/nf_conntrack_l4proto.h | 11 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_conntrack_proto_icmp.c | 47 | ||||
| -rw-r--r-- | net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c | 47 | ||||
| -rw-r--r-- | net/netfilter/Kconfig | 11 | ||||
| -rw-r--r-- | net/netfilter/Makefile | 1 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_dccp.c | 70 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_generic.c | 48 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_gre.c | 55 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_sctp.c | 69 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_tcp.c | 127 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_udp.c | 64 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_udplite.c | 66 | ||||
| -rw-r--r-- | net/netfilter/nfnetlink_cttimeout.c | 398 |
16 files changed, 1131 insertions, 1 deletions
diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild index aaa72aa..1697036 100644 --- a/include/linux/netfilter/Kbuild +++ b/include/linux/netfilter/Kbuild @@ -10,6 +10,7 @@ header-y += nfnetlink.h header-y += nfnetlink_acct.h header-y += nfnetlink_compat.h header-y += nfnetlink_conntrack.h +header-y += nfnetlink_cttimeout.h header-y += nfnetlink_log.h header-y += nfnetlink_queue.h header-y += x_tables.h diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h index b64454c..6fd1f0d 100644 --- a/include/linux/netfilter/nfnetlink.h +++ b/include/linux/netfilter/nfnetlink.h @@ -49,7 +49,8 @@ struct nfgenmsg { #define NFNL_SUBSYS_OSF 5 #define NFNL_SUBSYS_IPSET 6 #define NFNL_SUBSYS_ACCT 7 -#define NFNL_SUBSYS_COUNT 8 +#define NFNL_SUBSYS_CTNETLINK_TIMEOUT 8 +#define NFNL_SUBSYS_COUNT 9 #ifdef __KERNEL__ diff --git a/include/linux/netfilter/nfnetlink_cttimeout.h b/include/linux/netfilter/nfnetlink_cttimeout.h new file mode 100644 index 0000000..a2810a7 --- /dev/null +++ b/include/linux/netfilter/nfnetlink_cttimeout.h @@ -0,0 +1,114 @@ +#ifndef _CTTIMEOUT_NETLINK_H +#define _CTTIMEOUT_NETLINK_H +#include <linux/netfilter/nfnetlink.h> + +enum ctnl_timeout_msg_types { + IPCTNL_MSG_TIMEOUT_NEW, + IPCTNL_MSG_TIMEOUT_GET, + IPCTNL_MSG_TIMEOUT_DELETE, + + IPCTNL_MSG_TIMEOUT_MAX +}; + +enum ctattr_timeout { + CTA_TIMEOUT_UNSPEC, + CTA_TIMEOUT_NAME, + CTA_TIMEOUT_L3PROTO, + CTA_TIMEOUT_L4PROTO, + CTA_TIMEOUT_DATA, + CTA_TIMEOUT_USE, + __CTA_TIMEOUT_MAX +}; +#define CTA_TIMEOUT_MAX (__CTA_TIMEOUT_MAX - 1) + +enum ctattr_timeout_generic { + CTA_TIMEOUT_GENERIC_UNSPEC, + CTA_TIMEOUT_GENERIC_TIMEOUT, + __CTA_TIMEOUT_GENERIC_MAX +}; +#define CTA_TIMEOUT_GENERIC_MAX (__CTA_TIMEOUT_GENERIC_MAX - 1) + +enum ctattr_timeout_tcp { + CTA_TIMEOUT_TCP_UNSPEC, + CTA_TIMEOUT_TCP_SYN_SENT, + CTA_TIMEOUT_TCP_SYN_RECV, + CTA_TIMEOUT_TCP_ESTABLISHED, + CTA_TIMEOUT_TCP_FIN_WAIT, + CTA_TIMEOUT_TCP_CLOSE_WAIT, + CTA_TIMEOUT_TCP_LAST_ACK, + CTA_TIMEOUT_TCP_TIME_WAIT, + CTA_TIMEOUT_TCP_CLOSE, + CTA_TIMEOUT_TCP_SYN_SENT2, + CTA_TIMEOUT_TCP_RETRANS, + CTA_TIMEOUT_TCP_UNACK, + __CTA_TIMEOUT_TCP_MAX +}; +#define CTA_TIMEOUT_TCP_MAX (__CTA_TIMEOUT_TCP_MAX - 1) + +enum ctattr_timeout_udp { + CTA_TIMEOUT_UDP_UNSPEC, + CTA_TIMEOUT_UDP_UNREPLIED, + CTA_TIMEOUT_UDP_REPLIED, + __CTA_TIMEOUT_UDP_MAX +}; +#define CTA_TIMEOUT_UDP_MAX (__CTA_TIMEOUT_UDP_MAX - 1) + +enum ctattr_timeout_udplite { + CTA_TIMEOUT_UDPLITE_UNSPEC, + CTA_TIMEOUT_UDPLITE_UNREPLIED, + CTA_TIMEOUT_UDPLITE_REPLIED, + __CTA_TIMEOUT_UDPLITE_MAX +}; +#define CTA_TIMEOUT_UDPLITE_MAX (__CTA_TIMEOUT_UDPLITE_MAX - 1) + +enum ctattr_timeout_icmp { + CTA_TIMEOUT_ICMP_UNSPEC, + CTA_TIMEOUT_ICMP_TIMEOUT, + __CTA_TIMEOUT_ICMP_MAX +}; +#define CTA_TIMEOUT_ICMP_MAX (__CTA_TIMEOUT_ICMP_MAX - 1) + +enum ctattr_timeout_dccp { + CTA_TIMEOUT_DCCP_UNSPEC, + CTA_TIMEOUT_DCCP_REQUEST, + CTA_TIMEOUT_DCCP_RESPOND, + CTA_TIMEOUT_DCCP_PARTOPEN, + CTA_TIMEOUT_DCCP_OPEN, + CTA_TIMEOUT_DCCP_CLOSEREQ, + CTA_TIMEOUT_DCCP_CLOSING, + CTA_TIMEOUT_DCCP_TIMEWAIT, + __CTA_TIMEOUT_DCCP_MAX +}; +#define CTA_TIMEOUT_DCCP_MAX (__CTA_TIMEOUT_DCCP_MAX - 1) + +enum ctattr_timeout_sctp { + CTA_TIMEOUT_SCTP_UNSPEC, + CTA_TIMEOUT_SCTP_CLOSED, + CTA_TIMEOUT_SCTP_COOKIE_WAIT, + CTA_TIMEOUT_SCTP_COOKIE_ECHOED, + CTA_TIMEOUT_SCTP_ESTABLISHED, + CTA_TIMEOUT_SCTP_SHUTDOWN_SENT, + CTA_TIMEOUT_SCTP_SHUTDOWN_RECD, + CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT, + __CTA_TIMEOUT_SCTP_MAX +}; +#define CTA_TIMEOUT_SCTP_MAX (__CTA_TIMEOUT_SCTP_MAX - 1) + +enum ctattr_timeout_icmpv6 { + CTA_TIMEOUT_ICMPV6_UNSPEC, + CTA_TIMEOUT_ICMPV6_TIMEOUT, + __CTA_TIMEOUT_ICMPV6_MAX +}; +#define CTA_TIMEOUT_ICMPV6_MAX (__CTA_TIMEOUT_ICMPV6_MAX - 1) + +enum ctattr_timeout_gre { + CTA_TIMEOUT_GRE_UNSPEC, + CTA_TIMEOUT_GRE_UNREPLIED, + CTA_TIMEOUT_GRE_REPLIED, + __CTA_TIMEOUT_GRE_MAX +}; +#define CTA_TIMEOUT_GRE_MAX (__CTA_TIMEOUT_GRE_MAX - 1) + +#define CTNL_TIMEOUT_NAME_MAX 32 + +#endif diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h index c48b674..90c67c7 100644 --- a/include/net/netfilter/nf_conntrack_l4proto.h +++ b/include/net/netfilter/nf_conntrack_l4proto.h @@ -83,6 +83,17 @@ struct nf_conntrack_l4proto { size_t nla_size; +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + struct { + size_t obj_size; + int (*nlattr_to_obj)(struct nlattr *tb[], void *data); + int (*obj_to_nlattr)(struct sk_buff *skb, const void *data); + + unsigned int nlattr_max; + const struct nla_policy *nla_policy; + } ctnl_timeout; +#endif + #ifdef CONFIG_SYSCTL struct ctl_table_header **ctl_table_header; struct ctl_table *ctl_table; diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c index 6b80112..7cbe9cb 100644 --- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c +++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c @@ -269,6 +269,44 @@ static int icmp_nlattr_tuple_size(void) } #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +static int icmp_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) +{ + unsigned int *timeout = data; + + if (tb[CTA_TIMEOUT_ICMP_TIMEOUT]) { + *timeout = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMP_TIMEOUT])) * HZ; + } else { + /* Set default ICMP timeout. */ + *timeout = nf_ct_icmp_timeout; + } + return 0; +} + +static int +icmp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) +{ + const unsigned int *timeout = data; + + NLA_PUT_BE32(skb, CTA_TIMEOUT_ICMP_TIMEOUT, htonl(*timeout / HZ)); + + return 0; + +nla_put_failure: + return -ENOSPC; +} + +static const struct nla_policy +icmp_timeout_nla_policy[CTA_TIMEOUT_ICMP_MAX+1] = { + [CTA_TIMEOUT_ICMP_TIMEOUT] = { .type = NLA_U32 }, +}; +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ + #ifdef CONFIG_SYSCTL static struct ctl_table_header *icmp_sysctl_header; static struct ctl_table icmp_sysctl_table[] = { @@ -315,6 +353,15 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly = .nlattr_to_tuple = icmp_nlattr_to_tuple, .nla_policy = icmp_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = icmp_timeout_nlattr_to_obj, + .obj_to_nlattr = icmp_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_ICMP_MAX, + .obj_size = sizeof(unsigned int), + .nla_policy = icmp_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_header = &icmp_sysctl_header, .ctl_table = icmp_sysctl_table, diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c index 2eb9751..92cc9f2 100644 --- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c +++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c @@ -276,6 +276,44 @@ static int icmpv6_nlattr_tuple_size(void) } #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +static int icmpv6_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) +{ + unsigned int *timeout = data; + + if (tb[CTA_TIMEOUT_ICMPV6_TIMEOUT]) { + *timeout = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMPV6_TIMEOUT])) * HZ; + } else { + /* Set default ICMPv6 timeout. */ + *timeout = nf_ct_icmpv6_timeout; + } + return 0; +} + +static int +icmpv6_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) +{ + const unsigned int *timeout = data; + + NLA_PUT_BE32(skb, CTA_TIMEOUT_ICMPV6_TIMEOUT, htonl(*timeout / HZ)); + + return 0; + +nla_put_failure: + return -ENOSPC; +} + +static const struct nla_policy +icmpv6_timeout_nla_policy[CTA_TIMEOUT_ICMPV6_MAX+1] = { + [CTA_TIMEOUT_ICMPV6_TIMEOUT] = { .type = NLA_U32 }, +}; +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ + #ifdef CONFIG_SYSCTL static struct ctl_table_header *icmpv6_sysctl_header; static struct ctl_table icmpv6_sysctl_table[] = { @@ -308,6 +346,15 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly = .nlattr_to_tuple = icmpv6_nlattr_to_tuple, .nla_policy = icmpv6_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = icmpv6_timeout_nlattr_to_obj, + .obj_to_nlattr = icmpv6_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_ICMP_MAX, + .obj_size = sizeof(unsigned int), + .nla_policy = icmpv6_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_header = &icmpv6_sysctl_header, .ctl_table = icmpv6_sysctl_table, diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index b895d8b..f3efb65 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -314,6 +314,17 @@ config NF_CT_NETLINK help This option enables support for a netlink-based userspace interface +config NF_CT_NETLINK_TIMEOUT + tristate 'Connection tracking timeout tuning via Netlink' + select NETFILTER_NETLINK + depends on NETFILTER_ADVANCED + help + This option enables support for connection tracking timeout + fine-grain tuning. This allows you to attach specific timeout + policies to flows, instead of using the global timeout policy. + + If unsure, say `N'. + endif # NF_CONNTRACK # transparent proxy support diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index a28c2a6..cf7cdd6 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_NF_CT_PROTO_UDPLITE) += nf_conntrack_proto_udplite.o # netlink interface for nf_conntrack obj-$(CONFIG_NF_CT_NETLINK) += nf_conntrack_netlink.o +obj-$(CONFIG_NF_CT_NETLINK_TIMEOUT) += nfnetlink_cttimeout.o # connection tracking helpers nf_conntrack_h323-objs := nf_conntrack_h323_main.o nf_conntrack_h323_asn1.o diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c index 8ea3359..24fdce2 100644 --- a/net/netfilter/nf_conntrack_proto_dccp.c +++ b/net/netfilter/nf_conntrack_proto_dccp.c @@ -706,8 +706,60 @@ static int dccp_nlattr_size(void) return nla_total_size(0) /* CTA_PROTOINFO_DCCP */ + nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1); } + #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +static int dccp_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) +{ + struct dccp_net *dn = dccp_pernet(&init_net); + unsigned int *timeouts = data; + int i; + + /* set default DCCP timeouts. */ + for (i=0; i<CT_DCCP_MAX; i++) + timeouts[i] = dn->dccp_timeout[i]; + + /* there's a 1:1 mapping between attributes and protocol states. */ + for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) { + if (tb[i]) { + timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ; + } + } + return 0; +} + +static int +dccp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) +{ + const unsigned int *timeouts = data; + int i; + + for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) + NLA_PUT_BE32(skb, i, htonl(timeouts[i] / HZ)); + + return 0; + +nla_put_failure: + return -ENOSPC; +} + +static const struct nla_policy +dccp_timeout_nla_policy[CTA_TIMEOUT_DCCP_MAX+1] = { + [CTA_TIMEOUT_DCCP_REQUEST] = { .type = NLA_U32 }, + [CTA_TIMEOUT_DCCP_RESPOND] = { .type = NLA_U32 }, + [CTA_TIMEOUT_DCCP_PARTOPEN] = { .type = NLA_U32 }, + [CTA_TIMEOUT_DCCP_OPEN] = { .type = NLA_U32 }, + [CTA_TIMEOUT_DCCP_CLOSEREQ] = { .type = NLA_U32 }, + [CTA_TIMEOUT_DCCP_CLOSING] = { .type = NLA_U32 }, + [CTA_TIMEOUT_DCCP_TIMEWAIT] = { .type = NLA_U32 }, +}; +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ + #ifdef CONFIG_SYSCTL /* template, data assigned later */ static struct ctl_table dccp_sysctl_table[] = { @@ -784,6 +836,15 @@ static struct nf_conntrack_l4proto dccp_proto4 __read_mostly = { .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = dccp_timeout_nlattr_to_obj, + .obj_to_nlattr = dccp_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_DCCP_MAX, + .obj_size = sizeof(unsigned int) * CT_DCCP_MAX, + .nla_policy = dccp_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ }; static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = { @@ -807,6 +868,15 @@ static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = { .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = dccp_timeout_nlattr_to_obj, + .obj_to_nlattr = dccp_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_DCCP_MAX, + .obj_size = sizeof(unsigned int) * CT_DCCP_MAX, + .nla_policy = dccp_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ }; static __net_init int dccp_net_init(struct net *net) diff --git a/net/netfilter/nf_conntrack_proto_generic.c b/net/netfilter/nf_conntrack_proto_generic.c index 0e6c545..835e24c 100644 --- a/net/netfilter/nf_conntrack_proto_generic.c +++ b/net/netfilter/nf_conntrack_proto_generic.c @@ -65,6 +65,45 @@ static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb, return true; } +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +static int generic_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) +{ + unsigned int *timeout = data; + + if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT]) + *timeout = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ; + else { + /* Set default generic timeout. */ + *timeout = nf_ct_generic_timeout; + } + + return 0; +} + +static int +generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) +{ + const unsigned int *timeout = data; + + NLA_PUT_BE32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)); + + return 0; + +nla_put_failure: + return -ENOSPC; +} + +static const struct nla_policy +generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = { + [CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 }, +}; +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ + #ifdef CONFIG_SYSCTL static struct ctl_table_header *generic_sysctl_header; static struct ctl_table generic_sysctl_table[] = { @@ -102,6 +141,15 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly = .packet = generic_packet, .get_timeouts = generic_get_timeouts, .new = generic_new, +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = generic_timeout_nlattr_to_obj, + .obj_to_nlattr = generic_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_GENERIC_MAX, + .obj_size = sizeof(unsigned int), + .nla_policy = generic_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_header = &generic_sysctl_header, .ctl_table = generic_sysctl_table, diff --git a/net/netfilter/nf_conntrack_proto_gre.c b/net/netfilter/nf_conntrack_proto_gre.c index 1bf01c9..659648c 100644 --- a/net/netfilter/nf_conntrack_proto_gre.c +++ b/net/netfilter/nf_conntrack_proto_gre.c @@ -292,6 +292,52 @@ static void gre_destroy(struct nf_conn *ct) nf_ct_gre_keymap_destroy(master); } +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +static int gre_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) +{ + unsigned int *timeouts = data; + + /* set default timeouts for GRE. */ + timeouts[GRE_CT_UNREPLIED] = gre_timeouts[GRE_CT_UNREPLIED]; + timeouts[GRE_CT_REPLIED] = gre_timeouts[GRE_CT_REPLIED]; + + if (tb[CTA_TIMEOUT_GRE_UNREPLIED]) { + timeouts[GRE_CT_UNREPLIED] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_GRE_UNREPLIED])) * HZ; + } + if (tb[CTA_TIMEOUT_GRE_REPLIED]) { + timeouts[GRE_CT_REPLIED] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_GRE_REPLIED])) * HZ; + } + return 0; +} + +static int +gre_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) +{ + const unsigned int *timeouts = data; + + NLA_PUT_BE32(skb, CTA_TIMEOUT_GRE_UNREPLIED, + htonl(timeouts[GRE_CT_UNREPLIED] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_GRE_REPLIED, + htonl(timeouts[GRE_CT_REPLIED] / HZ)); + return 0; + +nla_put_failure: + return -ENOSPC; +} + +static const struct nla_policy +gre_timeout_nla_policy[CTA_TIMEOUT_GRE_MAX+1] = { + [CTA_TIMEOUT_GRE_UNREPLIED] = { .type = NLA_U32 }, + [CTA_TIMEOUT_GRE_REPLIED] = { .type = NLA_U32 }, +}; +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ + /* protocol helper struct */ static struct nf_conntrack_l4proto nf_conntrack_l4proto_gre4 __read_mostly = { .l3proto = AF_INET, @@ -312,6 +358,15 @@ static struct nf_conntrack_l4proto nf_conntrack_l4proto_gre4 __read_mostly = { .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = gre_timeout_nlattr_to_obj, + .obj_to_nlattr = gre_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_GRE_MAX, + .obj_size = sizeof(unsigned int) * GRE_CT_MAX, + .nla_policy = gre_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ }; static int proto_gre_net_init(struct net *net) diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c index 2a07033..72b5088 100644 --- a/net/netfilter/nf_conntrack_proto_sctp.c +++ b/net/netfilter/nf_conntrack_proto_sctp.c @@ -549,6 +549,57 @@ static int sctp_nlattr_size(void) } #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) +{ + unsigned int *timeouts = data; + int i; + + /* set default SCTP timeouts. */ + for (i=0; i<SCTP_CONNTRACK_MAX; i++) + timeouts[i] = sctp_timeouts[i]; + + /* there's a 1:1 mapping between attributes and protocol states. */ + for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { + if (tb[i]) { + timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ; + } + } + return 0; +} + +static int +sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) +{ + const unsigned int *timeouts = data; + int i; + + for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) + NLA_PUT_BE32(skb, i, htonl(timeouts[i] / HZ)); + + return 0; + +nla_put_failure: + return -ENOSPC; +} + +static const struct nla_policy +sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = { + [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 }, + [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 }, + [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 }, + [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 }, + [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 }, + [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 }, + [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 }, +}; +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ + + #ifdef CONFIG_SYSCTL static unsigned int sctp_sysctl_table_users; static struct ctl_table_header *sctp_sysctl_header; @@ -682,6 +733,15 @@ static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = { .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = sctp_timeout_nlattr_to_obj, + .obj_to_nlattr = sctp_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_SCTP_MAX, + .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, + .nla_policy = sctp_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_users = &sctp_sysctl_table_users, .ctl_table_header = &sctp_sysctl_header, @@ -712,6 +772,15 @@ static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = { .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nla_policy = nf_ct_port_nla_policy, +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = sctp_timeout_nlattr_to_obj, + .obj_to_nlattr = sctp_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_SCTP_MAX, + .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, + .nla_policy = sctp_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #endif #ifdef CONFIG_SYSCTL .ctl_table_users = &sctp_sysctl_table_users, diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index 8372bb4..361eade 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -1244,6 +1244,113 @@ static int tcp_nlattr_tuple_size(void) } #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +static int tcp_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) +{ + unsigned int *timeouts = data; + int i; + + /* set default TCP timeouts. */ + for (i=0; i<TCP_CONNTRACK_TIMEOUT_MAX; i++) + timeouts[i] = tcp_timeouts[i]; + + if (tb[CTA_TIMEOUT_TCP_SYN_SENT]) { + timeouts[TCP_CONNTRACK_SYN_SENT] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_SENT]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_SYN_RECV]) { + timeouts[TCP_CONNTRACK_SYN_RECV] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_RECV]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_ESTABLISHED]) { + timeouts[TCP_CONNTRACK_ESTABLISHED] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_ESTABLISHED]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_FIN_WAIT]) { + timeouts[TCP_CONNTRACK_FIN_WAIT] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_FIN_WAIT]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_CLOSE_WAIT]) { + timeouts[TCP_CONNTRACK_CLOSE_WAIT] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_CLOSE_WAIT]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_LAST_ACK]) { + timeouts[TCP_CONNTRACK_LAST_ACK] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_LAST_ACK]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_TIME_WAIT]) { + timeouts[TCP_CONNTRACK_TIME_WAIT] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_TIME_WAIT]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_CLOSE]) { + timeouts[TCP_CONNTRACK_CLOSE] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_CLOSE]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_SYN_SENT2]) { + timeouts[TCP_CONNTRACK_SYN_SENT2] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_SYN_SENT2]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_RETRANS]) { + timeouts[TCP_CONNTRACK_RETRANS] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_RETRANS]))*HZ; + } + if (tb[CTA_TIMEOUT_TCP_UNACK]) { + timeouts[TCP_CONNTRACK_UNACK] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_TCP_UNACK]))*HZ; + } + return 0; +} + +static int +tcp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) +{ + const unsigned int *timeouts = data; + + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_SYN_SENT, + htonl(timeouts[TCP_CONNTRACK_SYN_SENT] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_SYN_RECV, + htonl(timeouts[TCP_CONNTRACK_SYN_RECV] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_ESTABLISHED, + htonl(timeouts[TCP_CONNTRACK_ESTABLISHED] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_FIN_WAIT, + htonl(timeouts[TCP_CONNTRACK_FIN_WAIT] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_CLOSE_WAIT, + htonl(timeouts[TCP_CONNTRACK_CLOSE_WAIT] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_LAST_ACK, + htonl(timeouts[TCP_CONNTRACK_LAST_ACK] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_TIME_WAIT, + htonl(timeouts[TCP_CONNTRACK_TIME_WAIT] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_CLOSE, + htonl(timeouts[TCP_CONNTRACK_CLOSE] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_SYN_SENT2, + htonl(timeouts[TCP_CONNTRACK_SYN_SENT2] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_RETRANS, + htonl(timeouts[TCP_CONNTRACK_RETRANS] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_TCP_UNACK, + htonl(timeouts[TCP_CONNTRACK_UNACK] / HZ)); + return 0; + +nla_put_failure: + return -ENOSPC; +} + +static const struct nla_policy tcp_timeout_nla_policy[CTA_TIMEOUT_TCP_MAX+1] = { + [CTA_TIMEOUT_TCP_SYN_SENT] = { .type = NLA_U32 }, + [CTA_TIMEOUT_TCP_SYN_RECV] = { .type = NLA_U32 }, + [CTA_TIMEOUT_TCP_ESTABLISHED] = { .type = NLA_U32 }, + [CTA_TIMEOUT_TCP_FIN_WAIT] = { .type = NLA_U32 }, + [CTA_TIMEOUT_TCP_CLOSE_WAIT] = { .type = NLA_U32 }, + [CTA_TIMEOUT_TCP_LAST_ACK] = { .type = NLA_U32 }, + [CTA_TIMEOUT_TCP_TIME_WAIT] = { .type = NLA_U32 }, + [CTA_TIMEOUT_TCP_CLOSE] = { .type = NLA_U32 }, + [CTA_TIMEOUT_TCP_SYN_SENT2] = { .type = NLA_U32 }, +}; +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ + #ifdef CONFIG_SYSCTL static unsigned int tcp_sysctl_table_users; static struct ctl_table_header *tcp_sysctl_header; @@ -1462,6 +1569,16 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly = .nlattr_tuple_size = tcp_nlattr_tuple_size, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = tcp_timeout_nlattr_to_obj, + .obj_to_nlattr = tcp_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_TCP_MAX, + .obj_size = sizeof(unsigned int) * + TCP_CONNTRACK_TIMEOUT_MAX, + .nla_policy = tcp_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_users = &tcp_sysctl_table_users, .ctl_table_header = &tcp_sysctl_header, @@ -1495,6 +1612,16 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly = .nlattr_tuple_size = tcp_nlattr_tuple_size, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = tcp_timeout_nlattr_to_obj, + .obj_to_nlattr = tcp_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_TCP_MAX, + .obj_size = sizeof(unsigned int) * + TCP_CONNTRACK_TIMEOUT_MAX, + .nla_policy = tcp_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_users = &tcp_sysctl_table_users, .ctl_table_header = &tcp_sysctl_header, diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c index 70e0059..a9073dc 100644 --- a/net/netfilter/nf_conntrack_proto_udp.c +++ b/net/netfilter/nf_conntrack_proto_udp.c @@ -152,6 +152,52 @@ static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, return NF_ACCEPT; } +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +static int udp_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) +{ + unsigned int *timeouts = data; + + /* set default timeouts for UDP. */ + timeouts[UDP_CT_UNREPLIED] = udp_timeouts[UDP_CT_UNREPLIED]; + timeouts[UDP_CT_REPLIED] = udp_timeouts[UDP_CT_REPLIED]; + + if (tb[CTA_TIMEOUT_UDP_UNREPLIED]) { + timeouts[UDP_CT_UNREPLIED] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_UNREPLIED])) * HZ; + } + if (tb[CTA_TIMEOUT_UDP_REPLIED]) { + timeouts[UDP_CT_REPLIED] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_REPLIED])) * HZ; + } + return 0; +} + +static int +udp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) +{ + const unsigned int *timeouts = data; + + NLA_PUT_BE32(skb, CTA_TIMEOUT_UDP_UNREPLIED, + htonl(timeouts[UDP_CT_UNREPLIED] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_UDP_REPLIED, + htonl(timeouts[UDP_CT_REPLIED] / HZ)); + return 0; + +nla_put_failure: + return -ENOSPC; +} + +static const struct nla_policy +udp_timeout_nla_policy[CTA_TIMEOUT_UDP_MAX+1] = { + [CTA_TIMEOUT_UDP_UNREPLIED] = { .type = NLA_U32 }, + [CTA_TIMEOUT_UDP_REPLIED] = { .type = NLA_U32 }, +}; +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ + #ifdef CONFIG_SYSCTL static unsigned int udp_sysctl_table_users; static struct ctl_table_header *udp_sysctl_header; @@ -211,6 +257,15 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly = .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = udp_timeout_nlattr_to_obj, + .obj_to_nlattr = udp_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_UDP_MAX, + .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, + .nla_policy = udp_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_users = &udp_sysctl_table_users, .ctl_table_header = &udp_sysctl_header, @@ -240,6 +295,15 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly = .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = udp_timeout_nlattr_to_obj, + .obj_to_nlattr = udp_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_UDP_MAX, + .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, + .nla_policy = udp_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_users = &udp_sysctl_table_users, .ctl_table_header = &udp_sysctl_header, diff --git a/net/netfilter/nf_conntrack_proto_udplite.c b/net/netfilter/nf_conntrack_proto_udplite.c index 0b32ccb..e060639 100644 --- a/net/netfilter/nf_conntrack_proto_udplite.c +++ b/net/netfilter/nf_conntrack_proto_udplite.c @@ -156,6 +156,52 @@ static int udplite_error(struct net *net, struct nf_conn *tmpl, return NF_ACCEPT; } +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +static int udplite_timeout_nlattr_to_obj(struct nlattr *tb[], void *data) +{ + unsigned int *timeouts = data; + + /* set default timeouts for UDPlite. */ + timeouts[UDPLITE_CT_UNREPLIED] = udplite_timeouts[UDPLITE_CT_UNREPLIED]; + timeouts[UDPLITE_CT_REPLIED] = udplite_timeouts[UDPLITE_CT_REPLIED]; + + if (tb[CTA_TIMEOUT_UDPLITE_UNREPLIED]) { + timeouts[UDPLITE_CT_UNREPLIED] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_UNREPLIED])) * HZ; + } + if (tb[CTA_TIMEOUT_UDPLITE_REPLIED]) { + timeouts[UDPLITE_CT_REPLIED] = + ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_REPLIED])) * HZ; + } + return 0; +} + +static int +udplite_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) +{ + const unsigned int *timeouts = data; + + NLA_PUT_BE32(skb, CTA_TIMEOUT_UDPLITE_UNREPLIED, + htonl(timeouts[UDPLITE_CT_UNREPLIED] / HZ)); + NLA_PUT_BE32(skb, CTA_TIMEOUT_UDPLITE_REPLIED, + htonl(timeouts[UDPLITE_CT_REPLIED] / HZ)); + return 0; + +nla_put_failure: + return -ENOSPC; +} + +static const struct nla_policy +udplite_timeout_nla_policy[CTA_TIMEOUT_UDPLITE_MAX+1] = { + [CTA_TIMEOUT_UDPLITE_UNREPLIED] = { .type = NLA_U32 }, + [CTA_TIMEOUT_UDPLITE_REPLIED] = { .type = NLA_U32 }, +}; +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ + #ifdef CONFIG_SYSCTL static unsigned int udplite_sysctl_table_users; static struct ctl_table_header *udplite_sysctl_header; @@ -196,6 +242,16 @@ static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly = .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = udplite_timeout_nlattr_to_obj, + .obj_to_nlattr = udplite_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX, + .obj_size = sizeof(unsigned int) * + CTA_TIMEOUT_UDPLITE_MAX, + .nla_policy = udplite_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_users = &udplite_sysctl_table_users, .ctl_table_header = &udplite_sysctl_header, @@ -221,6 +277,16 @@ static struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly = .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nla_policy = nf_ct_port_nla_policy, #endif +#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) + .ctnl_timeout = { + .nlattr_to_obj = udplite_timeout_nlattr_to_obj, + .obj_to_nlattr = udplite_timeout_obj_to_nlattr, + .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX, + .obj_size = sizeof(unsigned int) * + CTA_TIMEOUT_UDPLITE_MAX, + .nla_policy = udplite_timeout_nla_policy, + }, +#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL .ctl_table_users = &udplite_sysctl_table_users, .ctl_table_header = &udplite_sysctl_header, diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c new file mode 100644 index 0000000..b860d52 --- /dev/null +++ b/net/netfilter/nfnetlink_cttimeout.c @@ -0,0 +1,398 @@ +/* + * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org> + * (C) 2012 by Vyatta Inc. <http://www.vyatta.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation (or any later at your option). + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/rculist.h> +#include <linux/rculist_nulls.h> +#include <linux/types.h> +#include <linux/timer.h> +#include <linux/security.h> +#include <linux/skbuff.h> +#include <linux/errno.h> +#include <linux/netlink.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/slab.h> + +#include <linux/netfilter.h> +#include <net/netlink.h> +#include <net/sock.h> +#include <net/netfilter/nf_conntrack.h> +#include <net/netfilter/nf_conntrack_core.h> +#include <net/netfilter/nf_conntrack_l3proto.h> +#include <net/netfilter/nf_conntrack_l4proto.h> +#include <net/netfilter/nf_conntrack_tuple.h> + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_cttimeout.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); +MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning"); + +struct ctnl_timeout { + struct list_head head; + struct rcu_head rcu_head; + atomic_t refcnt; + char name[CTNL_TIMEOUT_NAME_MAX]; + __u16 l3num; + __u8 l4num; + char data[0]; +}; + +static LIST_HEAD(cttimeout_list); + +static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = { + [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING }, + [CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 }, + [CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 }, + [CTA_TIMEOUT_DATA] = { .type = NLA_NESTED }, +}; + +static int +ctnl_timeout_parse_policy(struct ctnl_timeout *timeout, + struct nf_conntrack_l4proto *l4proto, + const struct nlattr *attr) +{ + int ret = 0; + + if (likely(l4proto->ctnl_timeout.nlattr_to_obj)) { + struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1]; + + nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max, + attr, l4proto->ctnl_timeout.nla_policy); + + ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, &timeout->data); + } + return ret; +} + +static int +cttimeout_new_timeout(struct sock *ctnl, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const cda[]) +{ + __u16 l3num; + __u8 l4num; + struct nf_conntrack_l4proto *l4proto; + struct ctnl_timeout *timeout, *matching = NULL; + char *name; + int ret; + + if (!cda[CTA_TIMEOUT_NAME] || + !cda[CTA_TIMEOUT_L3PROTO] || + !cda[CTA_TIMEOUT_L4PROTO] || + !cda[CTA_TIMEOUT_DATA]) + return -EINVAL; + + name = nla_data(cda[CTA_TIMEOUT_NAME]); + l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO])); + l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]); + + list_for_each_entry(timeout, &cttimeout_list, head) { + if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) + continue; + + if (nlh->nlmsg_flags & NLM_F_EXCL) + return -EEXIST; + + matching = timeout; + break; + } + + l4proto = __nf_ct_l4proto_find(l3num, l4num); + + /* This protocol is not supportted, skip. */ + if (l4proto->l4proto != l4num) + return -EOPNOTSUPP; + + if (matching) { + if (nlh->nlmsg_flags & NLM_F_REPLACE) { + /* You cannot replace one timeout policy by another of + * different kind, sorry. + */ + if (matching->l3num != l3num || + matching->l4num != l4num) + return -EINVAL; + + ret = ctnl_timeout_parse_policy(matching, l4proto, + cda[CTA_TIMEOUT_DATA]); + return ret; + } + return -EBUSY; + } + + timeout = kzalloc(sizeof(struct ctnl_timeout) + + l4proto->ctnl_timeout.obj_size, GFP_KERNEL); + if (timeout == NULL) + return -ENOMEM; + + ret = ctnl_timeout_parse_policy(timeout, l4proto, + cda[CTA_TIMEOUT_DATA]); + if (ret < 0) + goto err; + + strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME])); + timeout->l3num = l3num; + timeout->l4num = l4num; + atomic_set(&timeout->refcnt, 1); + list_add_tail_rcu(&timeout->head, &cttimeout_list); + + return 0; +err: + kfree(timeout); + return ret; +} + +static int +ctnl_timeout_fill_info(struct sk_buff *skb, u32 pid, u32 seq, u32 type, + int event, struct ctnl_timeout *timeout) +{ + struct nlmsghdr *nlh; + struct nfgenmsg *nfmsg; + unsigned int flags = pid ? NLM_F_MULTI : 0; + struct nf_conntrack_l4proto *l4proto; + + event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8; + nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags); + if (nlh == NULL) + goto nlmsg_failure; + + nfmsg = nlmsg_data(nlh); + nfmsg->nfgen_family = AF_UNSPEC; + nfmsg->version = NFNETLINK_V0; + nfmsg->res_id = 0; + + NLA_PUT_STRING(skb, CTA_TIMEOUT_NAME, timeout->name); + NLA_PUT_BE16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)); + NLA_PUT_U8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4num); + NLA_PUT_BE32(skb, CTA_TIMEOUT_USE, + htonl(atomic_read(&timeout->refcnt))); + + l4proto = __nf_ct_l4proto_find(timeout->l3num, timeout->l4num); + + /* If the timeout object does not match the layer 4 protocol tracker, + * then skip dumping the data part since we don't know how to + * interpret it. This may happen for UPDlite, SCTP and DCCP since + * you can unload the module. + */ + if (timeout->l4num != l4proto->l4proto) + goto out; + + if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) { + struct nlattr *nest_parms; + int ret; + + nest_parms = nla_nest_start(skb, + CTA_TIMEOUT_DATA | NLA_F_NESTED); + if (!nest_parms) + goto nla_put_failure; + + ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); + if (ret < 0) + goto nla_put_failure; + + nla_nest_end(skb, nest_parms); + } +out: + nlmsg_end(skb, nlh); + return skb->len; + +nlmsg_failure: +nla_put_failure: + nlmsg_cancel(skb, nlh); + return -1; +} + +static int +ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct ctnl_timeout *cur, *last; + + if (cb->args[2]) + return 0; + + last = (struct ctnl_timeout *)cb->args[1]; + if (cb->args[1]) + cb->args[1] = 0; + + rcu_read_lock(); + list_for_each_entry_rcu(cur, &cttimeout_list, head) { + if (last && cur != last) + continue; + + if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).pid, + cb->nlh->nlmsg_seq, + NFNL_MSG_TYPE(cb->nlh->nlmsg_type), + IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) { + cb->args[1] = (unsigned long)cur; + break; + } + } + if (!cb->args[1]) + cb->args[2] = 1; + rcu_read_unlock(); + return skb->len; +} + +static int +cttimeout_get_timeout(struct sock *ctnl, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const cda[]) +{ + int ret = -ENOENT; + char *name; + struct ctnl_timeout *cur; + + if (nlh->nlmsg_flags & NLM_F_DUMP) { + struct netlink_dump_control c = { + .dump = ctnl_timeout_dump, + }; + return netlink_dump_start(ctnl, skb, nlh, &c); + } + + if (!cda[CTA_TIMEOUT_NAME]) + return -EINVAL; + name = nla_data(cda[CTA_TIMEOUT_NAME]); + + list_for_each_entry(cur, &cttimeout_list, head) { + struct sk_buff *skb2; + + if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) + continue; + + skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (skb2 == NULL) { + ret = -ENOMEM; + break; + } + + ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).pid, + nlh->nlmsg_seq, + NFNL_MSG_TYPE(nlh->nlmsg_type), + IPCTNL_MSG_TIMEOUT_NEW, cur); + if (ret <= 0) { + kfree_skb(skb2); + break; + } + ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, + MSG_DONTWAIT); + if (ret > 0) + ret = 0; + + /* this avoids a loop in nfnetlink. */ + return ret == -EAGAIN ? -ENOBUFS : ret; + } + return ret; +} + +/* try to delete object, fail if it is still in use. */ +static int ctnl_timeout_try_del(struct ctnl_timeout *timeout) +{ + int ret = 0; + + /* we want to avoid races with nf_ct_timeout_find_get. */ + if (atomic_dec_and_test(&timeout->refcnt)) { + /* We are protected by nfnl mutex. */ + list_del_rcu(&timeout->head); + kfree_rcu(timeout, rcu_head); + } else { + /* still in use, restore reference counter. */ + atomic_inc(&timeout->refcnt); + ret = -EBUSY; + } + return ret; +} + +static int +cttimeout_del_timeout(struct sock *ctnl, struct sk_buff *skb, + const struct nlmsghdr *nlh, + const struct nlattr * const cda[]) +{ + char *name; + struct ctnl_timeout *cur; + int ret = -ENOENT; + + if (!cda[CTA_TIMEOUT_NAME]) { + list_for_each_entry(cur, &cttimeout_list, head) + ctnl_timeout_try_del(cur); + + return 0; + } + name = nla_data(cda[CTA_TIMEOUT_NAME]); + + list_for_each_entry(cur, &cttimeout_list, head) { + if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) + continue; + + ret = ctnl_timeout_try_del(cur); + if (ret < 0) + return ret; + + break; + } + return ret; +} + +static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { + [IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout, + .attr_count = CTA_TIMEOUT_MAX, + .policy = cttimeout_nla_policy }, + [IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout, + .attr_count = CTA_TIMEOUT_MAX, + .policy = cttimeout_nla_policy }, + [IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout, + .attr_count = CTA_TIMEOUT_MAX, + .policy = cttimeout_nla_policy }, +}; + +static const struct nfnetlink_subsystem cttimeout_subsys = { + .name = "conntrack_timeout", + .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT, + .cb_count = IPCTNL_MSG_TIMEOUT_MAX, + .cb = cttimeout_cb, +}; + +MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT); + +static int __init cttimeout_init(void) +{ + int ret; + + ret = nfnetlink_subsys_register(&cttimeout_subsys); + if (ret < 0) { + pr_err("cttimeout_init: cannot register cttimeout with " + "nfnetlink.\n"); + goto err_out; + } + return 0; + +err_out: + return ret; +} + +static void __exit cttimeout_exit(void) +{ + struct ctnl_timeout *cur, *tmp; + + pr_info("cttimeout: unregistering from nfnetlink.\n"); + + nfnetlink_subsys_unregister(&cttimeout_subsys); + list_for_each_entry_safe(cur, tmp, &cttimeout_list, head) { + list_del_rcu(&cur->head); + /* We are sure that our objects have no clients at this point, + * it's safe to release them all without checking refcnt. + */ + kfree_rcu(cur, rcu_head); + } +} + +module_init(cttimeout_init); +module_exit(cttimeout_exit); |