2116 lines
50 KiB
C
2116 lines
50 KiB
C
/* Connection tracking via netlink socket. Allows for user space
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* protocol helpers and general trouble making from userspace.
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*
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* (C) 2001 by Jay Schulist <jschlst@samba.org>
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* (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
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* (C) 2003 by Patrick Mchardy <kaber@trash.net>
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* (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* Initial connection tracking via netlink development funded and
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* generally made possible by Network Robots, Inc. (www.networkrobots.com)
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*
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* Further development of this code funded by Astaro AG (http://www.astaro.com)
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/rculist.h>
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#include <linux/rculist_nulls.h>
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#include <linux/types.h>
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#include <linux/timer.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/netlink.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/netfilter.h>
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#include <net/netlink.h>
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#include <net/sock.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_l3proto.h>
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#include <net/netfilter/nf_conntrack_l4proto.h>
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#include <net/netfilter/nf_conntrack_tuple.h>
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#include <net/netfilter/nf_conntrack_acct.h>
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#include <net/netfilter/nf_conntrack_zones.h>
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#ifdef CONFIG_NF_NAT_NEEDED
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#include <net/netfilter/nf_nat_core.h>
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#include <net/netfilter/nf_nat_protocol.h>
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#endif
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nfnetlink_conntrack.h>
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MODULE_LICENSE("GPL");
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static char __initdata version[] = "0.93";
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static inline int
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ctnetlink_dump_tuples_proto(struct sk_buff *skb,
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const struct nf_conntrack_tuple *tuple,
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struct nf_conntrack_l4proto *l4proto)
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{
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int ret = 0;
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struct nlattr *nest_parms;
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nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
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if (!nest_parms)
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goto nla_put_failure;
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NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
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if (likely(l4proto->tuple_to_nlattr))
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ret = l4proto->tuple_to_nlattr(skb, tuple);
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nla_nest_end(skb, nest_parms);
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return ret;
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nla_put_failure:
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return -1;
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}
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static inline int
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ctnetlink_dump_tuples_ip(struct sk_buff *skb,
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const struct nf_conntrack_tuple *tuple,
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struct nf_conntrack_l3proto *l3proto)
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{
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int ret = 0;
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struct nlattr *nest_parms;
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nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
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if (!nest_parms)
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goto nla_put_failure;
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if (likely(l3proto->tuple_to_nlattr))
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ret = l3proto->tuple_to_nlattr(skb, tuple);
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nla_nest_end(skb, nest_parms);
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return ret;
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nla_put_failure:
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return -1;
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}
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static int
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ctnetlink_dump_tuples(struct sk_buff *skb,
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const struct nf_conntrack_tuple *tuple)
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{
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int ret;
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struct nf_conntrack_l3proto *l3proto;
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struct nf_conntrack_l4proto *l4proto;
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l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
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ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
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if (unlikely(ret < 0))
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return ret;
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l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
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ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
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return ret;
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}
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static inline int
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ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
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{
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NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
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return 0;
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nla_put_failure:
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return -1;
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}
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static inline int
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ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
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{
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long timeout = (ct->timeout.expires - jiffies) / HZ;
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if (timeout < 0)
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timeout = 0;
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NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
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return 0;
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nla_put_failure:
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return -1;
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}
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static inline int
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ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
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{
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struct nf_conntrack_l4proto *l4proto;
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struct nlattr *nest_proto;
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int ret;
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l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
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if (!l4proto->to_nlattr)
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return 0;
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nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
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if (!nest_proto)
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goto nla_put_failure;
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ret = l4proto->to_nlattr(skb, nest_proto, ct);
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nla_nest_end(skb, nest_proto);
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return ret;
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nla_put_failure:
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return -1;
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}
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static inline int
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ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
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{
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struct nlattr *nest_helper;
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const struct nf_conn_help *help = nfct_help(ct);
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struct nf_conntrack_helper *helper;
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if (!help)
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return 0;
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helper = rcu_dereference(help->helper);
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if (!helper)
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goto out;
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nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
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if (!nest_helper)
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goto nla_put_failure;
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NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
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if (helper->to_nlattr)
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helper->to_nlattr(skb, ct);
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nla_nest_end(skb, nest_helper);
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out:
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return 0;
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nla_put_failure:
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return -1;
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}
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static int
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ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
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enum ip_conntrack_dir dir)
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{
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enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
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struct nlattr *nest_count;
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const struct nf_conn_counter *acct;
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acct = nf_conn_acct_find(ct);
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if (!acct)
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return 0;
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nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
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if (!nest_count)
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goto nla_put_failure;
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NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
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cpu_to_be64(acct[dir].packets));
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NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
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cpu_to_be64(acct[dir].bytes));
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nla_nest_end(skb, nest_count);
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return 0;
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nla_put_failure:
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return -1;
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}
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#ifdef CONFIG_NF_CONNTRACK_MARK
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static inline int
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ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
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{
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NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
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return 0;
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nla_put_failure:
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return -1;
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}
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#else
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#define ctnetlink_dump_mark(a, b) (0)
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#endif
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
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static inline int
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ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
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{
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NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
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return 0;
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nla_put_failure:
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return -1;
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}
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#else
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#define ctnetlink_dump_secmark(a, b) (0)
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#endif
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#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
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static inline int
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ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
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{
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struct nlattr *nest_parms;
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if (!(ct->status & IPS_EXPECTED))
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return 0;
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nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
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if (!nest_parms)
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goto nla_put_failure;
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if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
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goto nla_put_failure;
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nla_nest_end(skb, nest_parms);
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return 0;
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nla_put_failure:
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return -1;
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}
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#ifdef CONFIG_NF_NAT_NEEDED
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static int
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dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
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{
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struct nlattr *nest_parms;
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nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
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if (!nest_parms)
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goto nla_put_failure;
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NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
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htonl(natseq->correction_pos));
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NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
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htonl(natseq->offset_before));
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NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
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htonl(natseq->offset_after));
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nla_nest_end(skb, nest_parms);
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return 0;
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nla_put_failure:
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return -1;
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}
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static inline int
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ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
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{
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struct nf_nat_seq *natseq;
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struct nf_conn_nat *nat = nfct_nat(ct);
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if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
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return 0;
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natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
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if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
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return -1;
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natseq = &nat->seq[IP_CT_DIR_REPLY];
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if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
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return -1;
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return 0;
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}
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#else
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#define ctnetlink_dump_nat_seq_adj(a, b) (0)
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#endif
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static inline int
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ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
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{
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NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
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return 0;
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nla_put_failure:
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return -1;
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}
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static inline int
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ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
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{
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NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
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return 0;
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nla_put_failure:
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return -1;
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}
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static int
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ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
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int event, struct nf_conn *ct)
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{
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struct nlmsghdr *nlh;
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struct nfgenmsg *nfmsg;
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struct nlattr *nest_parms;
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unsigned int flags = pid ? NLM_F_MULTI : 0;
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event |= NFNL_SUBSYS_CTNETLINK << 8;
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nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
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if (nlh == NULL)
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goto nlmsg_failure;
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nfmsg = nlmsg_data(nlh);
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nfmsg->nfgen_family = nf_ct_l3num(ct);
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nfmsg->version = NFNETLINK_V0;
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nfmsg->res_id = 0;
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nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
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if (!nest_parms)
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goto nla_put_failure;
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if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
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goto nla_put_failure;
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nla_nest_end(skb, nest_parms);
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nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
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if (!nest_parms)
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goto nla_put_failure;
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if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
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goto nla_put_failure;
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nla_nest_end(skb, nest_parms);
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if (nf_ct_zone(ct))
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NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
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if (ctnetlink_dump_status(skb, ct) < 0 ||
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ctnetlink_dump_timeout(skb, ct) < 0 ||
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ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
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ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
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ctnetlink_dump_protoinfo(skb, ct) < 0 ||
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ctnetlink_dump_helpinfo(skb, ct) < 0 ||
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ctnetlink_dump_mark(skb, ct) < 0 ||
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ctnetlink_dump_secmark(skb, ct) < 0 ||
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ctnetlink_dump_id(skb, ct) < 0 ||
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ctnetlink_dump_use(skb, ct) < 0 ||
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ctnetlink_dump_master(skb, ct) < 0 ||
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ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
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goto nla_put_failure;
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nlmsg_end(skb, nlh);
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return skb->len;
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nlmsg_failure:
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return -1;
|
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}
|
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|
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#ifdef CONFIG_NF_CONNTRACK_EVENTS
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static inline size_t
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ctnetlink_proto_size(const struct nf_conn *ct)
|
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{
|
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struct nf_conntrack_l3proto *l3proto;
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struct nf_conntrack_l4proto *l4proto;
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size_t len = 0;
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|
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rcu_read_lock();
|
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l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
|
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len += l3proto->nla_size;
|
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|
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l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
|
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len += l4proto->nla_size;
|
|
rcu_read_unlock();
|
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|
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return len;
|
|
}
|
|
|
|
static inline size_t
|
|
ctnetlink_counters_size(const struct nf_conn *ct)
|
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{
|
|
if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
|
|
return 0;
|
|
return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
|
|
+ 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
|
|
+ 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
|
|
;
|
|
}
|
|
|
|
static inline size_t
|
|
ctnetlink_nlmsg_size(const struct nf_conn *ct)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct nfgenmsg))
|
|
+ 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
|
|
+ 3 * nla_total_size(0) /* CTA_TUPLE_IP */
|
|
+ 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
|
|
+ 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
|
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
|
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+ nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
|
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+ ctnetlink_counters_size(ct)
|
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+ nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
|
|
+ nla_total_size(0) /* CTA_PROTOINFO */
|
|
+ nla_total_size(0) /* CTA_HELP */
|
|
+ nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
|
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
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+ nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
|
|
#endif
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
+ 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
|
|
+ 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
|
|
#endif
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
|
|
#endif
|
|
+ ctnetlink_proto_size(ct)
|
|
;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
|
|
{
|
|
struct net *net;
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
struct nlattr *nest_parms;
|
|
struct nf_conn *ct = item->ct;
|
|
struct sk_buff *skb;
|
|
unsigned int type;
|
|
unsigned int flags = 0, group;
|
|
int err;
|
|
|
|
/* ignore our fake conntrack entry */
|
|
if (ct == &nf_conntrack_untracked)
|
|
return 0;
|
|
|
|
if (events & (1 << IPCT_DESTROY)) {
|
|
type = IPCTNL_MSG_CT_DELETE;
|
|
group = NFNLGRP_CONNTRACK_DESTROY;
|
|
} else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
|
|
type = IPCTNL_MSG_CT_NEW;
|
|
flags = NLM_F_CREATE|NLM_F_EXCL;
|
|
group = NFNLGRP_CONNTRACK_NEW;
|
|
} else if (events) {
|
|
type = IPCTNL_MSG_CT_NEW;
|
|
group = NFNLGRP_CONNTRACK_UPDATE;
|
|
} else
|
|
return 0;
|
|
|
|
net = nf_ct_net(ct);
|
|
if (!item->report && !nfnetlink_has_listeners(net, group))
|
|
return 0;
|
|
|
|
skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
type |= NFNL_SUBSYS_CTNETLINK << 8;
|
|
nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
|
|
if (nlh == NULL)
|
|
goto nlmsg_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = nf_ct_l3num(ct);
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
rcu_read_lock();
|
|
nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
if (nf_ct_zone(ct))
|
|
NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
|
|
|
|
if (ctnetlink_dump_id(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (ctnetlink_dump_status(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (events & (1 << IPCT_DESTROY)) {
|
|
if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
|
|
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
|
|
goto nla_put_failure;
|
|
} else {
|
|
if (ctnetlink_dump_timeout(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (events & (1 << IPCT_PROTOINFO)
|
|
&& ctnetlink_dump_protoinfo(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
|
|
&& ctnetlink_dump_helpinfo(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
|
if ((events & (1 << IPCT_SECMARK) || ct->secmark)
|
|
&& ctnetlink_dump_secmark(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
|
|
if (events & (1 << IPCT_RELATED) &&
|
|
ctnetlink_dump_master(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (events & (1 << IPCT_NATSEQADJ) &&
|
|
ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
if ((events & (1 << IPCT_MARK) || ct->mark)
|
|
&& ctnetlink_dump_mark(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
rcu_read_unlock();
|
|
|
|
nlmsg_end(skb, nlh);
|
|
err = nfnetlink_send(skb, net, item->pid, group, item->report,
|
|
GFP_ATOMIC);
|
|
if (err == -ENOBUFS || err == -EAGAIN)
|
|
return -ENOBUFS;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
rcu_read_unlock();
|
|
nlmsg_cancel(skb, nlh);
|
|
nlmsg_failure:
|
|
kfree_skb(skb);
|
|
errout:
|
|
if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
|
|
return -ENOBUFS;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_NF_CONNTRACK_EVENTS */
|
|
|
|
static int ctnetlink_done(struct netlink_callback *cb)
|
|
{
|
|
if (cb->args[1])
|
|
nf_ct_put((struct nf_conn *)cb->args[1]);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nf_conn *ct, *last;
|
|
struct nf_conntrack_tuple_hash *h;
|
|
struct hlist_nulls_node *n;
|
|
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
|
|
rcu_read_lock();
|
|
last = (struct nf_conn *)cb->args[1];
|
|
for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
|
|
restart:
|
|
hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
|
|
hnnode) {
|
|
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
|
|
continue;
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
if (!atomic_inc_not_zero(&ct->ct_general.use))
|
|
continue;
|
|
/* Dump entries of a given L3 protocol number.
|
|
* If it is not specified, ie. l3proto == 0,
|
|
* then dump everything. */
|
|
if (l3proto && nf_ct_l3num(ct) != l3proto)
|
|
goto releasect;
|
|
if (cb->args[1]) {
|
|
if (ct != last)
|
|
goto releasect;
|
|
cb->args[1] = 0;
|
|
}
|
|
if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
IPCTNL_MSG_CT_NEW, ct) < 0) {
|
|
cb->args[1] = (unsigned long)ct;
|
|
goto out;
|
|
}
|
|
|
|
if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
|
|
IPCTNL_MSG_CT_GET_CTRZERO) {
|
|
struct nf_conn_counter *acct;
|
|
|
|
acct = nf_conn_acct_find(ct);
|
|
if (acct)
|
|
memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
|
|
}
|
|
releasect:
|
|
nf_ct_put(ct);
|
|
}
|
|
if (cb->args[1]) {
|
|
cb->args[1] = 0;
|
|
goto restart;
|
|
}
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
if (last)
|
|
nf_ct_put(last);
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
|
|
{
|
|
struct nlattr *tb[CTA_IP_MAX+1];
|
|
struct nf_conntrack_l3proto *l3proto;
|
|
int ret = 0;
|
|
|
|
nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
|
|
|
|
rcu_read_lock();
|
|
l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
|
|
|
|
if (likely(l3proto->nlattr_to_tuple)) {
|
|
ret = nla_validate_nested(attr, CTA_IP_MAX,
|
|
l3proto->nla_policy);
|
|
if (ret == 0)
|
|
ret = l3proto->nlattr_to_tuple(tb, tuple);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
|
|
[CTA_PROTO_NUM] = { .type = NLA_U8 },
|
|
};
|
|
|
|
static inline int
|
|
ctnetlink_parse_tuple_proto(struct nlattr *attr,
|
|
struct nf_conntrack_tuple *tuple)
|
|
{
|
|
struct nlattr *tb[CTA_PROTO_MAX+1];
|
|
struct nf_conntrack_l4proto *l4proto;
|
|
int ret = 0;
|
|
|
|
ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!tb[CTA_PROTO_NUM])
|
|
return -EINVAL;
|
|
tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
|
|
|
|
rcu_read_lock();
|
|
l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
|
|
|
|
if (likely(l4proto->nlattr_to_tuple)) {
|
|
ret = nla_validate_nested(attr, CTA_PROTO_MAX,
|
|
l4proto->nla_policy);
|
|
if (ret == 0)
|
|
ret = l4proto->nlattr_to_tuple(tb, tuple);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
|
|
[CTA_TUPLE_IP] = { .type = NLA_NESTED },
|
|
[CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int
|
|
ctnetlink_parse_tuple(const struct nlattr * const cda[],
|
|
struct nf_conntrack_tuple *tuple,
|
|
enum ctattr_tuple type, u_int8_t l3num)
|
|
{
|
|
struct nlattr *tb[CTA_TUPLE_MAX+1];
|
|
int err;
|
|
|
|
memset(tuple, 0, sizeof(*tuple));
|
|
|
|
nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
|
|
|
|
if (!tb[CTA_TUPLE_IP])
|
|
return -EINVAL;
|
|
|
|
tuple->src.l3num = l3num;
|
|
|
|
err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[CTA_TUPLE_PROTO])
|
|
return -EINVAL;
|
|
|
|
err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* orig and expect tuples get DIR_ORIGINAL */
|
|
if (type == CTA_TUPLE_REPLY)
|
|
tuple->dst.dir = IP_CT_DIR_REPLY;
|
|
else
|
|
tuple->dst.dir = IP_CT_DIR_ORIGINAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
|
|
{
|
|
if (attr)
|
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
|
*zone = ntohs(nla_get_be16(attr));
|
|
#else
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
else
|
|
*zone = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
|
|
[CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
|
|
};
|
|
|
|
static inline int
|
|
ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
|
|
{
|
|
struct nlattr *tb[CTA_HELP_MAX+1];
|
|
|
|
nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
|
|
|
|
if (!tb[CTA_HELP_NAME])
|
|
return -EINVAL;
|
|
|
|
*helper_name = nla_data(tb[CTA_HELP_NAME]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
|
|
[CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
|
|
[CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
|
|
[CTA_STATUS] = { .type = NLA_U32 },
|
|
[CTA_PROTOINFO] = { .type = NLA_NESTED },
|
|
[CTA_HELP] = { .type = NLA_NESTED },
|
|
[CTA_NAT_SRC] = { .type = NLA_NESTED },
|
|
[CTA_TIMEOUT] = { .type = NLA_U32 },
|
|
[CTA_MARK] = { .type = NLA_U32 },
|
|
[CTA_ID] = { .type = NLA_U32 },
|
|
[CTA_NAT_DST] = { .type = NLA_NESTED },
|
|
[CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
|
|
[CTA_ZONE] = { .type = NLA_U16 },
|
|
};
|
|
|
|
static int
|
|
ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
struct net *net = sock_net(ctnl);
|
|
struct nf_conntrack_tuple_hash *h;
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conn *ct;
|
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
u16 zone;
|
|
int err;
|
|
|
|
err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cda[CTA_TUPLE_ORIG])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
|
|
else if (cda[CTA_TUPLE_REPLY])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
|
|
else {
|
|
/* Flush the whole table */
|
|
nf_conntrack_flush_report(net,
|
|
NETLINK_CB(skb).pid,
|
|
nlmsg_report(nlh));
|
|
return 0;
|
|
}
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
h = nf_conntrack_find_get(net, zone, &tuple);
|
|
if (!h)
|
|
return -ENOENT;
|
|
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
|
|
if (cda[CTA_ID]) {
|
|
u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
|
|
if (id != (u32)(unsigned long)ct) {
|
|
nf_ct_put(ct);
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
if (nf_conntrack_event_report(IPCT_DESTROY, ct,
|
|
NETLINK_CB(skb).pid,
|
|
nlmsg_report(nlh)) < 0) {
|
|
nf_ct_delete_from_lists(ct);
|
|
/* we failed to report the event, try later */
|
|
nf_ct_insert_dying_list(ct);
|
|
nf_ct_put(ct);
|
|
return 0;
|
|
}
|
|
|
|
/* death_by_timeout would report the event again */
|
|
set_bit(IPS_DYING_BIT, &ct->status);
|
|
|
|
nf_ct_kill(ct);
|
|
nf_ct_put(ct);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
struct net *net = sock_net(ctnl);
|
|
struct nf_conntrack_tuple_hash *h;
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conn *ct;
|
|
struct sk_buff *skb2 = NULL;
|
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
u16 zone;
|
|
int err;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP)
|
|
return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
|
|
ctnetlink_done);
|
|
|
|
err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cda[CTA_TUPLE_ORIG])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
|
|
else if (cda[CTA_TUPLE_REPLY])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
|
|
else
|
|
return -EINVAL;
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
h = nf_conntrack_find_get(net, zone, &tuple);
|
|
if (!h)
|
|
return -ENOENT;
|
|
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
|
|
err = -ENOMEM;
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (skb2 == NULL) {
|
|
nf_ct_put(ct);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
|
|
IPCTNL_MSG_CT_NEW, ct);
|
|
rcu_read_unlock();
|
|
nf_ct_put(ct);
|
|
if (err <= 0)
|
|
goto free;
|
|
|
|
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
return 0;
|
|
|
|
free:
|
|
kfree_skb(skb2);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
static int
|
|
ctnetlink_parse_nat_setup(struct nf_conn *ct,
|
|
enum nf_nat_manip_type manip,
|
|
const struct nlattr *attr)
|
|
{
|
|
typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
|
|
|
|
parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
|
|
if (!parse_nat_setup) {
|
|
#ifdef CONFIG_MODULES
|
|
rcu_read_unlock();
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
nfnl_unlock();
|
|
if (request_module("nf-nat-ipv4") < 0) {
|
|
nfnl_lock();
|
|
spin_lock_bh(&nf_conntrack_lock);
|
|
rcu_read_lock();
|
|
return -EOPNOTSUPP;
|
|
}
|
|
nfnl_lock();
|
|
spin_lock_bh(&nf_conntrack_lock);
|
|
rcu_read_lock();
|
|
if (nfnetlink_parse_nat_setup_hook)
|
|
return -EAGAIN;
|
|
#endif
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return parse_nat_setup(ct, manip, attr);
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
|
|
{
|
|
unsigned long d;
|
|
unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
|
|
d = ct->status ^ status;
|
|
|
|
if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
|
|
/* unchangeable */
|
|
return -EBUSY;
|
|
|
|
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
|
|
/* SEEN_REPLY bit can only be set */
|
|
return -EBUSY;
|
|
|
|
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
|
|
/* ASSURED bit can only be set */
|
|
return -EBUSY;
|
|
|
|
/* Be careful here, modifying NAT bits can screw up things,
|
|
* so don't let users modify them directly if they don't pass
|
|
* nf_nat_range. */
|
|
ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
|
|
{
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
int ret;
|
|
|
|
if (cda[CTA_NAT_DST]) {
|
|
ret = ctnetlink_parse_nat_setup(ct,
|
|
IP_NAT_MANIP_DST,
|
|
cda[CTA_NAT_DST]);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
if (cda[CTA_NAT_SRC]) {
|
|
ret = ctnetlink_parse_nat_setup(ct,
|
|
IP_NAT_MANIP_SRC,
|
|
cda[CTA_NAT_SRC]);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
#else
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
|
|
{
|
|
struct nf_conntrack_helper *helper;
|
|
struct nf_conn_help *help = nfct_help(ct);
|
|
char *helpname = NULL;
|
|
int err;
|
|
|
|
/* don't change helper of sibling connections */
|
|
if (ct->master)
|
|
return -EBUSY;
|
|
|
|
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!strcmp(helpname, "")) {
|
|
if (help && help->helper) {
|
|
/* we had a helper before ... */
|
|
nf_ct_remove_expectations(ct);
|
|
rcu_assign_pointer(help->helper, NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
|
|
nf_ct_protonum(ct));
|
|
if (helper == NULL) {
|
|
#ifdef CONFIG_MODULES
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
|
|
if (request_module("nfct-helper-%s", helpname) < 0) {
|
|
spin_lock_bh(&nf_conntrack_lock);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
spin_lock_bh(&nf_conntrack_lock);
|
|
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
|
|
nf_ct_protonum(ct));
|
|
if (helper)
|
|
return -EAGAIN;
|
|
#endif
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (help) {
|
|
if (help->helper == helper)
|
|
return 0;
|
|
if (help->helper)
|
|
return -EBUSY;
|
|
/* need to zero data of old helper */
|
|
memset(&help->help, 0, sizeof(help->help));
|
|
} else {
|
|
/* we cannot set a helper for an existing conntrack */
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
rcu_assign_pointer(help->helper, helper);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
|
|
{
|
|
u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
|
|
|
|
if (!del_timer(&ct->timeout))
|
|
return -ETIME;
|
|
|
|
ct->timeout.expires = jiffies + timeout * HZ;
|
|
add_timer(&ct->timeout);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
|
|
[CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
|
|
[CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
|
|
[CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static inline int
|
|
ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
|
|
{
|
|
const struct nlattr *attr = cda[CTA_PROTOINFO];
|
|
struct nlattr *tb[CTA_PROTOINFO_MAX+1];
|
|
struct nf_conntrack_l4proto *l4proto;
|
|
int err = 0;
|
|
|
|
nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
|
|
|
|
rcu_read_lock();
|
|
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
|
|
if (l4proto->from_nlattr)
|
|
err = l4proto->from_nlattr(tb, ct);
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
|
|
[CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
|
|
[CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
|
|
[CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static inline int
|
|
change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
|
|
{
|
|
struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
|
|
|
|
nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
|
|
|
|
if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
|
|
return -EINVAL;
|
|
|
|
natseq->correction_pos =
|
|
ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
|
|
|
|
if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
|
|
return -EINVAL;
|
|
|
|
natseq->offset_before =
|
|
ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
|
|
|
|
if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
|
|
return -EINVAL;
|
|
|
|
natseq->offset_after =
|
|
ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
int ret = 0;
|
|
struct nf_conn_nat *nat = nfct_nat(ct);
|
|
|
|
if (!nat)
|
|
return 0;
|
|
|
|
if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
|
|
ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
|
|
cda[CTA_NAT_SEQ_ADJ_ORIG]);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ct->status |= IPS_SEQ_ADJUST;
|
|
}
|
|
|
|
if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
|
|
ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
|
|
cda[CTA_NAT_SEQ_ADJ_REPLY]);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ct->status |= IPS_SEQ_ADJUST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
ctnetlink_change_conntrack(struct nf_conn *ct,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
int err;
|
|
|
|
/* only allow NAT changes and master assignation for new conntracks */
|
|
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
|
|
return -EOPNOTSUPP;
|
|
|
|
if (cda[CTA_HELP]) {
|
|
err = ctnetlink_change_helper(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_TIMEOUT]) {
|
|
err = ctnetlink_change_timeout(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_STATUS]) {
|
|
err = ctnetlink_change_status(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_PROTOINFO]) {
|
|
err = ctnetlink_change_protoinfo(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
#if defined(CONFIG_NF_CONNTRACK_MARK)
|
|
if (cda[CTA_MARK])
|
|
ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
|
|
#endif
|
|
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
|
|
err = ctnetlink_change_nat_seq_adj(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nf_conn *
|
|
ctnetlink_create_conntrack(struct net *net, u16 zone,
|
|
const struct nlattr * const cda[],
|
|
struct nf_conntrack_tuple *otuple,
|
|
struct nf_conntrack_tuple *rtuple,
|
|
u8 u3)
|
|
{
|
|
struct nf_conn *ct;
|
|
int err = -EINVAL;
|
|
struct nf_conntrack_helper *helper;
|
|
|
|
ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
|
|
if (IS_ERR(ct))
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (!cda[CTA_TIMEOUT])
|
|
goto err1;
|
|
ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
|
|
|
|
ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
|
|
|
|
rcu_read_lock();
|
|
if (cda[CTA_HELP]) {
|
|
char *helpname = NULL;
|
|
|
|
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
|
|
nf_ct_protonum(ct));
|
|
if (helper == NULL) {
|
|
rcu_read_unlock();
|
|
#ifdef CONFIG_MODULES
|
|
if (request_module("nfct-helper-%s", helpname) < 0) {
|
|
err = -EOPNOTSUPP;
|
|
goto err1;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
helper = __nf_conntrack_helper_find(helpname,
|
|
nf_ct_l3num(ct),
|
|
nf_ct_protonum(ct));
|
|
if (helper) {
|
|
err = -EAGAIN;
|
|
goto err2;
|
|
}
|
|
rcu_read_unlock();
|
|
#endif
|
|
err = -EOPNOTSUPP;
|
|
goto err1;
|
|
} else {
|
|
struct nf_conn_help *help;
|
|
|
|
help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
|
|
if (help == NULL) {
|
|
err = -ENOMEM;
|
|
goto err2;
|
|
}
|
|
|
|
/* not in hash table yet so not strictly necessary */
|
|
rcu_assign_pointer(help->helper, helper);
|
|
}
|
|
} else {
|
|
/* try an implicit helper assignation */
|
|
err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
|
|
if (err < 0)
|
|
goto err2;
|
|
}
|
|
|
|
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
|
|
err = ctnetlink_change_nat(ct, cda);
|
|
if (err < 0)
|
|
goto err2;
|
|
}
|
|
|
|
nf_ct_acct_ext_add(ct, GFP_ATOMIC);
|
|
nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
|
|
/* we must add conntrack extensions before confirmation. */
|
|
ct->status |= IPS_CONFIRMED;
|
|
|
|
if (cda[CTA_STATUS]) {
|
|
err = ctnetlink_change_status(ct, cda);
|
|
if (err < 0)
|
|
goto err2;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
|
|
err = ctnetlink_change_nat_seq_adj(ct, cda);
|
|
if (err < 0)
|
|
goto err2;
|
|
}
|
|
#endif
|
|
|
|
if (cda[CTA_PROTOINFO]) {
|
|
err = ctnetlink_change_protoinfo(ct, cda);
|
|
if (err < 0)
|
|
goto err2;
|
|
}
|
|
|
|
#if defined(CONFIG_NF_CONNTRACK_MARK)
|
|
if (cda[CTA_MARK])
|
|
ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
|
|
#endif
|
|
|
|
/* setup master conntrack: this is a confirmed expectation */
|
|
if (cda[CTA_TUPLE_MASTER]) {
|
|
struct nf_conntrack_tuple master;
|
|
struct nf_conntrack_tuple_hash *master_h;
|
|
struct nf_conn *master_ct;
|
|
|
|
err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
master_h = nf_conntrack_find_get(net, zone, &master);
|
|
if (master_h == NULL) {
|
|
err = -ENOENT;
|
|
goto err2;
|
|
}
|
|
master_ct = nf_ct_tuplehash_to_ctrack(master_h);
|
|
__set_bit(IPS_EXPECTED_BIT, &ct->status);
|
|
ct->master = master_ct;
|
|
}
|
|
|
|
add_timer(&ct->timeout);
|
|
nf_conntrack_hash_insert(ct);
|
|
rcu_read_unlock();
|
|
|
|
return ct;
|
|
|
|
err2:
|
|
rcu_read_unlock();
|
|
err1:
|
|
nf_conntrack_free(ct);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int
|
|
ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
struct net *net = sock_net(ctnl);
|
|
struct nf_conntrack_tuple otuple, rtuple;
|
|
struct nf_conntrack_tuple_hash *h = NULL;
|
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
u16 zone;
|
|
int err;
|
|
|
|
err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cda[CTA_TUPLE_ORIG]) {
|
|
err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_TUPLE_REPLY]) {
|
|
err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
spin_lock_bh(&nf_conntrack_lock);
|
|
if (cda[CTA_TUPLE_ORIG])
|
|
h = __nf_conntrack_find(net, zone, &otuple);
|
|
else if (cda[CTA_TUPLE_REPLY])
|
|
h = __nf_conntrack_find(net, zone, &rtuple);
|
|
|
|
if (h == NULL) {
|
|
err = -ENOENT;
|
|
if (nlh->nlmsg_flags & NLM_F_CREATE) {
|
|
struct nf_conn *ct;
|
|
enum ip_conntrack_events events;
|
|
|
|
ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
|
|
&rtuple, u3);
|
|
if (IS_ERR(ct)) {
|
|
err = PTR_ERR(ct);
|
|
goto out_unlock;
|
|
}
|
|
err = 0;
|
|
nf_conntrack_get(&ct->ct_general);
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
if (test_bit(IPS_EXPECTED_BIT, &ct->status))
|
|
events = IPCT_RELATED;
|
|
else
|
|
events = IPCT_NEW;
|
|
|
|
nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
|
|
(1 << IPCT_ASSURED) |
|
|
(1 << IPCT_HELPER) |
|
|
(1 << IPCT_PROTOINFO) |
|
|
(1 << IPCT_NATSEQADJ) |
|
|
(1 << IPCT_MARK) | events,
|
|
ct, NETLINK_CB(skb).pid,
|
|
nlmsg_report(nlh));
|
|
nf_ct_put(ct);
|
|
} else
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
|
|
return err;
|
|
}
|
|
/* implicit 'else' */
|
|
|
|
/* We manipulate the conntrack inside the global conntrack table lock,
|
|
* so there's no need to increase the refcount */
|
|
err = -EEXIST;
|
|
if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
|
|
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
|
|
|
|
err = ctnetlink_change_conntrack(ct, cda);
|
|
if (err == 0) {
|
|
nf_conntrack_get(&ct->ct_general);
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
|
|
(1 << IPCT_ASSURED) |
|
|
(1 << IPCT_HELPER) |
|
|
(1 << IPCT_PROTOINFO) |
|
|
(1 << IPCT_NATSEQADJ) |
|
|
(1 << IPCT_MARK),
|
|
ct, NETLINK_CB(skb).pid,
|
|
nlmsg_report(nlh));
|
|
nf_ct_put(ct);
|
|
} else
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
out_unlock:
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
return err;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* EXPECT
|
|
***********************************************************************/
|
|
|
|
static inline int
|
|
ctnetlink_exp_dump_tuple(struct sk_buff *skb,
|
|
const struct nf_conntrack_tuple *tuple,
|
|
enum ctattr_expect type)
|
|
{
|
|
struct nlattr *nest_parms;
|
|
|
|
nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
if (ctnetlink_dump_tuples(skb, tuple) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_exp_dump_mask(struct sk_buff *skb,
|
|
const struct nf_conntrack_tuple *tuple,
|
|
const struct nf_conntrack_tuple_mask *mask)
|
|
{
|
|
int ret;
|
|
struct nf_conntrack_l3proto *l3proto;
|
|
struct nf_conntrack_l4proto *l4proto;
|
|
struct nf_conntrack_tuple m;
|
|
struct nlattr *nest_parms;
|
|
|
|
memset(&m, 0xFF, sizeof(m));
|
|
memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
|
|
m.src.u.all = mask->src.u.all;
|
|
m.dst.protonum = tuple->dst.protonum;
|
|
|
|
nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
|
|
l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
|
|
ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
|
|
|
|
if (unlikely(ret < 0))
|
|
goto nla_put_failure;
|
|
|
|
l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
|
|
ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
|
|
if (unlikely(ret < 0))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_exp_dump_expect(struct sk_buff *skb,
|
|
const struct nf_conntrack_expect *exp)
|
|
{
|
|
struct nf_conn *master = exp->master;
|
|
struct nf_conntrack_helper *helper;
|
|
long timeout = (exp->timeout.expires - jiffies) / HZ;
|
|
|
|
if (timeout < 0)
|
|
timeout = 0;
|
|
|
|
if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
|
|
goto nla_put_failure;
|
|
if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
|
|
goto nla_put_failure;
|
|
if (ctnetlink_exp_dump_tuple(skb,
|
|
&master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
|
|
CTA_EXPECT_MASTER) < 0)
|
|
goto nla_put_failure;
|
|
|
|
NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
|
|
NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
|
|
helper = rcu_dereference(nfct_help(master)->helper);
|
|
if (helper)
|
|
NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
|
|
int event, const struct nf_conntrack_expect *exp)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
unsigned int flags = pid ? NLM_F_MULTI : 0;
|
|
|
|
event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
|
|
nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
|
|
if (nlh == NULL)
|
|
goto nlmsg_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = exp->tuple.src.l3num;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
static int
|
|
ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
|
|
{
|
|
struct nf_conntrack_expect *exp = item->exp;
|
|
struct net *net = nf_ct_exp_net(exp);
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
struct sk_buff *skb;
|
|
unsigned int type;
|
|
int flags = 0;
|
|
|
|
if (events & (1 << IPEXP_NEW)) {
|
|
type = IPCTNL_MSG_EXP_NEW;
|
|
flags = NLM_F_CREATE|NLM_F_EXCL;
|
|
} else
|
|
return 0;
|
|
|
|
if (!item->report &&
|
|
!nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
|
|
return 0;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
|
|
type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
|
|
nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
|
|
if (nlh == NULL)
|
|
goto nlmsg_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = exp->tuple.src.l3num;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
rcu_read_lock();
|
|
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
|
|
goto nla_put_failure;
|
|
rcu_read_unlock();
|
|
|
|
nlmsg_end(skb, nlh);
|
|
nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
|
|
item->report, GFP_ATOMIC);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
rcu_read_unlock();
|
|
nlmsg_cancel(skb, nlh);
|
|
nlmsg_failure:
|
|
kfree_skb(skb);
|
|
errout:
|
|
nfnetlink_set_err(net, 0, 0, -ENOBUFS);
|
|
return 0;
|
|
}
|
|
#endif
|
|
static int ctnetlink_exp_done(struct netlink_callback *cb)
|
|
{
|
|
if (cb->args[1])
|
|
nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nf_conntrack_expect *exp, *last;
|
|
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
struct hlist_node *n;
|
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
|
|
rcu_read_lock();
|
|
last = (struct nf_conntrack_expect *)cb->args[1];
|
|
for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
|
|
restart:
|
|
hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
|
|
hnode) {
|
|
if (l3proto && exp->tuple.src.l3num != l3proto)
|
|
continue;
|
|
if (cb->args[1]) {
|
|
if (exp != last)
|
|
continue;
|
|
cb->args[1] = 0;
|
|
}
|
|
if (ctnetlink_exp_fill_info(skb,
|
|
NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
IPCTNL_MSG_EXP_NEW,
|
|
exp) < 0) {
|
|
if (!atomic_inc_not_zero(&exp->use))
|
|
continue;
|
|
cb->args[1] = (unsigned long)exp;
|
|
goto out;
|
|
}
|
|
}
|
|
if (cb->args[1]) {
|
|
cb->args[1] = 0;
|
|
goto restart;
|
|
}
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
if (last)
|
|
nf_ct_expect_put(last);
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
|
|
[CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
|
|
[CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
|
|
[CTA_EXPECT_MASK] = { .type = NLA_NESTED },
|
|
[CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
|
|
[CTA_EXPECT_ID] = { .type = NLA_U32 },
|
|
[CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
|
|
};
|
|
|
|
static int
|
|
ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
struct net *net = sock_net(ctnl);
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conntrack_expect *exp;
|
|
struct sk_buff *skb2;
|
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
u16 zone;
|
|
int err;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
return netlink_dump_start(ctnl, skb, nlh,
|
|
ctnetlink_exp_dump_table,
|
|
ctnetlink_exp_done);
|
|
}
|
|
|
|
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cda[CTA_EXPECT_MASTER])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
|
|
else
|
|
return -EINVAL;
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
exp = nf_ct_expect_find_get(net, zone, &tuple);
|
|
if (!exp)
|
|
return -ENOENT;
|
|
|
|
if (cda[CTA_EXPECT_ID]) {
|
|
__be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
|
|
if (ntohl(id) != (u32)(unsigned long)exp) {
|
|
nf_ct_expect_put(exp);
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
goto out;
|
|
|
|
rcu_read_lock();
|
|
err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
|
|
nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
|
|
rcu_read_unlock();
|
|
if (err <= 0)
|
|
goto free;
|
|
|
|
nf_ct_expect_put(exp);
|
|
|
|
return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
|
|
free:
|
|
kfree_skb(skb2);
|
|
out:
|
|
nf_ct_expect_put(exp);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
struct net *net = sock_net(ctnl);
|
|
struct nf_conntrack_expect *exp;
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
struct hlist_node *n, *next;
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
unsigned int i;
|
|
u16 zone;
|
|
int err;
|
|
|
|
if (cda[CTA_EXPECT_TUPLE]) {
|
|
/* delete a single expect by tuple */
|
|
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* bump usage count to 2 */
|
|
exp = nf_ct_expect_find_get(net, zone, &tuple);
|
|
if (!exp)
|
|
return -ENOENT;
|
|
|
|
if (cda[CTA_EXPECT_ID]) {
|
|
__be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
|
|
if (ntohl(id) != (u32)(unsigned long)exp) {
|
|
nf_ct_expect_put(exp);
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
/* after list removal, usage count == 1 */
|
|
nf_ct_unexpect_related(exp);
|
|
/* have to put what we 'get' above.
|
|
* after this line usage count == 0 */
|
|
nf_ct_expect_put(exp);
|
|
} else if (cda[CTA_EXPECT_HELP_NAME]) {
|
|
char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
|
|
struct nf_conn_help *m_help;
|
|
|
|
/* delete all expectations for this helper */
|
|
spin_lock_bh(&nf_conntrack_lock);
|
|
for (i = 0; i < nf_ct_expect_hsize; i++) {
|
|
hlist_for_each_entry_safe(exp, n, next,
|
|
&net->ct.expect_hash[i],
|
|
hnode) {
|
|
m_help = nfct_help(exp->master);
|
|
if (!strcmp(m_help->helper->name, name) &&
|
|
del_timer(&exp->timeout)) {
|
|
nf_ct_unlink_expect(exp);
|
|
nf_ct_expect_put(exp);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
} else {
|
|
/* This basically means we have to flush everything*/
|
|
spin_lock_bh(&nf_conntrack_lock);
|
|
for (i = 0; i < nf_ct_expect_hsize; i++) {
|
|
hlist_for_each_entry_safe(exp, n, next,
|
|
&net->ct.expect_hash[i],
|
|
hnode) {
|
|
if (del_timer(&exp->timeout)) {
|
|
nf_ct_unlink_expect(exp);
|
|
nf_ct_expect_put(exp);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
static int
|
|
ctnetlink_change_expect(struct nf_conntrack_expect *x,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_create_expect(struct net *net, u16 zone,
|
|
const struct nlattr * const cda[],
|
|
u_int8_t u3,
|
|
u32 pid, int report)
|
|
{
|
|
struct nf_conntrack_tuple tuple, mask, master_tuple;
|
|
struct nf_conntrack_tuple_hash *h = NULL;
|
|
struct nf_conntrack_expect *exp;
|
|
struct nf_conn *ct;
|
|
struct nf_conn_help *help;
|
|
int err = 0;
|
|
|
|
/* caller guarantees that those three CTA_EXPECT_* exist */
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
|
|
if (err < 0)
|
|
return err;
|
|
err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
|
|
if (err < 0)
|
|
return err;
|
|
err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* Look for master conntrack of this expectation */
|
|
h = nf_conntrack_find_get(net, zone, &master_tuple);
|
|
if (!h)
|
|
return -ENOENT;
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
help = nfct_help(ct);
|
|
|
|
if (!help || !help->helper) {
|
|
/* such conntrack hasn't got any helper, abort */
|
|
err = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
exp = nf_ct_expect_alloc(ct);
|
|
if (!exp) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
exp->class = 0;
|
|
exp->expectfn = NULL;
|
|
exp->flags = 0;
|
|
exp->master = ct;
|
|
exp->helper = NULL;
|
|
memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
|
|
memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
|
|
exp->mask.src.u.all = mask.src.u.all;
|
|
|
|
err = nf_ct_expect_related_report(exp, pid, report);
|
|
nf_ct_expect_put(exp);
|
|
|
|
out:
|
|
nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
struct net *net = sock_net(ctnl);
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conntrack_expect *exp;
|
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
u16 zone;
|
|
int err;
|
|
|
|
if (!cda[CTA_EXPECT_TUPLE]
|
|
|| !cda[CTA_EXPECT_MASK]
|
|
|| !cda[CTA_EXPECT_MASTER])
|
|
return -EINVAL;
|
|
|
|
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
spin_lock_bh(&nf_conntrack_lock);
|
|
exp = __nf_ct_expect_find(net, zone, &tuple);
|
|
|
|
if (!exp) {
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
err = -ENOENT;
|
|
if (nlh->nlmsg_flags & NLM_F_CREATE) {
|
|
err = ctnetlink_create_expect(net, zone, cda,
|
|
u3,
|
|
NETLINK_CB(skb).pid,
|
|
nlmsg_report(nlh));
|
|
}
|
|
return err;
|
|
}
|
|
|
|
err = -EEXIST;
|
|
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
|
|
err = ctnetlink_change_expect(exp, cda);
|
|
spin_unlock_bh(&nf_conntrack_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
static struct nf_ct_event_notifier ctnl_notifier = {
|
|
.fcn = ctnetlink_conntrack_event,
|
|
};
|
|
|
|
static struct nf_exp_event_notifier ctnl_notifier_exp = {
|
|
.fcn = ctnetlink_expect_event,
|
|
};
|
|
#endif
|
|
|
|
static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
|
|
[IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
|
|
.attr_count = CTA_MAX,
|
|
.policy = ct_nla_policy },
|
|
[IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
|
|
.attr_count = CTA_MAX,
|
|
.policy = ct_nla_policy },
|
|
[IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
|
|
.attr_count = CTA_MAX,
|
|
.policy = ct_nla_policy },
|
|
[IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
|
|
.attr_count = CTA_MAX,
|
|
.policy = ct_nla_policy },
|
|
};
|
|
|
|
static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
|
|
[IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
|
|
.attr_count = CTA_EXPECT_MAX,
|
|
.policy = exp_nla_policy },
|
|
[IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
|
|
.attr_count = CTA_EXPECT_MAX,
|
|
.policy = exp_nla_policy },
|
|
[IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
|
|
.attr_count = CTA_EXPECT_MAX,
|
|
.policy = exp_nla_policy },
|
|
};
|
|
|
|
static const struct nfnetlink_subsystem ctnl_subsys = {
|
|
.name = "conntrack",
|
|
.subsys_id = NFNL_SUBSYS_CTNETLINK,
|
|
.cb_count = IPCTNL_MSG_MAX,
|
|
.cb = ctnl_cb,
|
|
};
|
|
|
|
static const struct nfnetlink_subsystem ctnl_exp_subsys = {
|
|
.name = "conntrack_expect",
|
|
.subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
|
|
.cb_count = IPCTNL_MSG_EXP_MAX,
|
|
.cb = ctnl_exp_cb,
|
|
};
|
|
|
|
MODULE_ALIAS("ip_conntrack_netlink");
|
|
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
|
|
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
|
|
|
|
static int __init ctnetlink_init(void)
|
|
{
|
|
int ret;
|
|
|
|
pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
|
|
ret = nfnetlink_subsys_register(&ctnl_subsys);
|
|
if (ret < 0) {
|
|
pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
|
|
goto err_out;
|
|
}
|
|
|
|
ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
|
|
if (ret < 0) {
|
|
pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
|
|
goto err_unreg_subsys;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
ret = nf_conntrack_register_notifier(&ctnl_notifier);
|
|
if (ret < 0) {
|
|
pr_err("ctnetlink_init: cannot register notifier.\n");
|
|
goto err_unreg_exp_subsys;
|
|
}
|
|
|
|
ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
|
|
if (ret < 0) {
|
|
pr_err("ctnetlink_init: cannot expect register notifier.\n");
|
|
goto err_unreg_notifier;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
err_unreg_notifier:
|
|
nf_conntrack_unregister_notifier(&ctnl_notifier);
|
|
err_unreg_exp_subsys:
|
|
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
|
|
#endif
|
|
err_unreg_subsys:
|
|
nfnetlink_subsys_unregister(&ctnl_subsys);
|
|
err_out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ctnetlink_exit(void)
|
|
{
|
|
pr_info("ctnetlink: unregistering from nfnetlink.\n");
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
|
|
nf_conntrack_unregister_notifier(&ctnl_notifier);
|
|
#endif
|
|
|
|
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
|
|
nfnetlink_subsys_unregister(&ctnl_subsys);
|
|
}
|
|
|
|
module_init(ctnetlink_init);
|
|
module_exit(ctnetlink_exit);
|