bb5cf80e94
/me awards the bloatiest-of-all-net/-.c-code award to nf_conntrack_netlink.c, congratulations to all the authors :-/! Hall of (unquestionable) fame (measured per inline, top 10 under net/): -4496 ctnetlink_parse_tuple netfilter/nf_conntrack_netlink.c -2165 ctnetlink_dump_tuples netfilter/nf_conntrack_netlink.c -2115 __ip_vs_get_out_rt ipv4/ipvs/ip_vs_xmit.c -1924 xfrm_audit_helper_pktinfo xfrm/xfrm_state.c -1799 ctnetlink_parse_tuple_proto netfilter/nf_conntrack_netlink.c -1268 ctnetlink_parse_tuple_ip netfilter/nf_conntrack_netlink.c -1093 ctnetlink_exp_dump_expect netfilter/nf_conntrack_netlink.c -1060 void ccid3_update_send_interval dccp/ccids/ccid3.c -983 ctnetlink_dump_tuples_proto netfilter/nf_conntrack_netlink.c -827 ctnetlink_exp_dump_tuple netfilter/nf_conntrack_netlink.c (i386 / gcc (GCC) 4.1.2 20070626 (Red Hat 4.1.2-13) / allyesconfig except CONFIG_FORCED_INLINING) ...and I left < 200 byte gains as future work item. After iterative inline removal, I finally have this: net/netfilter/nf_conntrack_netlink.c: ctnetlink_exp_fill_info | -1104 ctnetlink_new_expect | -1572 ctnetlink_fill_info | -1303 ctnetlink_new_conntrack | -2230 ctnetlink_get_expect | -341 ctnetlink_del_expect | -352 ctnetlink_expect_event | -1110 ctnetlink_conntrack_event | -1548 ctnetlink_del_conntrack | -729 ctnetlink_get_conntrack | -728 10 functions changed, 11017 bytes removed, diff: -11017 net/netfilter/nf_conntrack_netlink.c: ctnetlink_parse_tuple | +419 dump_nat_seq_adj | +183 ctnetlink_dump_counters | +166 ctnetlink_dump_tuples | +261 ctnetlink_exp_dump_expect | +633 ctnetlink_change_status | +460 6 functions changed, 2122 bytes added, diff: +2122 net/netfilter/nf_conntrack_netlink.o: 16 functions changed, 2122 bytes added, 11017 bytes removed, diff: -8895 Without a number of CONFIG.*DEBUGs, I got this: net/netfilter/nf_conntrack_netlink.o: 16 functions changed, 2122 bytes added, 11029 bytes removed, diff: -8907 Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
1869 lines
44 KiB
C
1869 lines
44 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) 2005-2007 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/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/notifier.h>
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#include <linux/netfilter.h>
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#include <net/netlink.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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#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_get(tuple->src.l3num);
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ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
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nf_ct_l3proto_put(l3proto);
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if (unlikely(ret < 0))
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return ret;
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l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
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ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
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nf_ct_l4proto_put(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, const struct nf_conn *ct)
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{
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struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
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struct nlattr *nest_proto;
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int ret;
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if (!l4proto->to_nlattr) {
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nf_ct_l4proto_put(l4proto);
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return 0;
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}
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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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nf_ct_l4proto_put(l4proto);
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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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nf_ct_l4proto_put(l4proto);
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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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rcu_read_lock();
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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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rcu_read_unlock();
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return 0;
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nla_put_failure:
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rcu_read_unlock();
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return -1;
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}
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#ifdef CONFIG_NF_CT_ACCT
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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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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_BE32(skb, CTA_COUNTERS32_PACKETS,
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htonl(ct->counters[dir].packets));
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NLA_PUT_BE32(skb, CTA_COUNTERS32_BYTES,
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htonl(ct->counters[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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#else
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#define ctnetlink_dump_counters(a, b, c) (0)
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#endif
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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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|
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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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|
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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)
|
|
{
|
|
NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static inline int
|
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ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
|
|
{
|
|
NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
|
|
|
|
static int
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|
ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
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|
int event, int nowait,
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|
const struct nf_conn *ct)
|
|
{
|
|
struct nlmsghdr *nlh;
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|
struct nfgenmsg *nfmsg;
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|
struct nlattr *nest_parms;
|
|
unsigned char *b = skb_tail_pointer(skb);
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|
|
|
event |= NFNL_SUBSYS_CTNETLINK << 8;
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|
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
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|
nfmsg = NLMSG_DATA(nlh);
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|
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|
nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
|
|
nfmsg->nfgen_family =
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|
ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
if (ctnetlink_dump_tuples(skb, 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, tuple(ct, IP_CT_DIR_REPLY)) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
if (ctnetlink_dump_status(skb, ct) < 0 ||
|
|
ctnetlink_dump_timeout(skb, ct) < 0 ||
|
|
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
|
|
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
|
|
ctnetlink_dump_protoinfo(skb, ct) < 0 ||
|
|
ctnetlink_dump_helpinfo(skb, ct) < 0 ||
|
|
ctnetlink_dump_mark(skb, ct) < 0 ||
|
|
ctnetlink_dump_secmark(skb, ct) < 0 ||
|
|
ctnetlink_dump_id(skb, ct) < 0 ||
|
|
ctnetlink_dump_use(skb, ct) < 0 ||
|
|
ctnetlink_dump_master(skb, ct) < 0 ||
|
|
ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
static int ctnetlink_conntrack_event(struct notifier_block *this,
|
|
unsigned long events, void *ptr)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
struct nlattr *nest_parms;
|
|
struct nf_conn *ct = (struct nf_conn *)ptr;
|
|
struct sk_buff *skb;
|
|
unsigned int type;
|
|
sk_buff_data_t b;
|
|
unsigned int flags = 0, group;
|
|
|
|
/* ignore our fake conntrack entry */
|
|
if (ct == &nf_conntrack_untracked)
|
|
return NOTIFY_DONE;
|
|
|
|
if (events & IPCT_DESTROY) {
|
|
type = IPCTNL_MSG_CT_DELETE;
|
|
group = NFNLGRP_CONNTRACK_DESTROY;
|
|
} else if (events & (IPCT_NEW | IPCT_RELATED)) {
|
|
type = IPCTNL_MSG_CT_NEW;
|
|
flags = NLM_F_CREATE|NLM_F_EXCL;
|
|
group = NFNLGRP_CONNTRACK_NEW;
|
|
} else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
|
|
type = IPCTNL_MSG_CT_NEW;
|
|
group = NFNLGRP_CONNTRACK_UPDATE;
|
|
} else
|
|
return NOTIFY_DONE;
|
|
|
|
if (!nfnetlink_has_listeners(group))
|
|
return NOTIFY_DONE;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return NOTIFY_DONE;
|
|
|
|
b = skb->tail;
|
|
|
|
type |= NFNL_SUBSYS_CTNETLINK << 8;
|
|
nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
|
|
nfmsg = NLMSG_DATA(nlh);
|
|
|
|
nlh->nlmsg_flags = flags;
|
|
nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
if (ctnetlink_dump_tuples(skb, 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, tuple(ct, IP_CT_DIR_REPLY)) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
if (events & 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_status(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (ctnetlink_dump_timeout(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (events & IPCT_PROTOINFO
|
|
&& ctnetlink_dump_protoinfo(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if ((events & IPCT_HELPER || nfct_help(ct))
|
|
&& ctnetlink_dump_helpinfo(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
if ((events & IPCT_MARK || ct->mark)
|
|
&& ctnetlink_dump_mark(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
|
if ((events & IPCT_SECMARK || ct->secmark)
|
|
&& ctnetlink_dump_secmark(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
|
|
if (events & IPCT_COUNTER_FILLING &&
|
|
(ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
|
|
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
|
|
goto nla_put_failure;
|
|
|
|
if (events & IPCT_RELATED &&
|
|
ctnetlink_dump_master(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (events & IPCT_NATSEQADJ &&
|
|
ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
nfnetlink_send(skb, 0, group, 0);
|
|
return NOTIFY_DONE;
|
|
|
|
nlmsg_failure:
|
|
nla_put_failure:
|
|
kfree_skb(skb);
|
|
return NOTIFY_DONE;
|
|
}
|
|
#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;
|
|
}
|
|
|
|
#define L3PROTO(ct) (ct)->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
|
|
|
|
static int
|
|
ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nf_conn *ct, *last;
|
|
struct nf_conntrack_tuple_hash *h;
|
|
struct hlist_node *n;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
|
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
|
|
read_lock_bh(&nf_conntrack_lock);
|
|
last = (struct nf_conn *)cb->args[1];
|
|
for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
|
|
restart:
|
|
hlist_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
|
|
hnode) {
|
|
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
|
|
continue;
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
/* Dump entries of a given L3 protocol number.
|
|
* If it is not specified, ie. l3proto == 0,
|
|
* then dump everything. */
|
|
if (l3proto && L3PROTO(ct) != l3proto)
|
|
continue;
|
|
if (cb->args[1]) {
|
|
if (ct != last)
|
|
continue;
|
|
cb->args[1] = 0;
|
|
}
|
|
if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
IPCTNL_MSG_CT_NEW,
|
|
1, ct) < 0) {
|
|
nf_conntrack_get(&ct->ct_general);
|
|
cb->args[1] = (unsigned long)ct;
|
|
goto out;
|
|
}
|
|
#ifdef CONFIG_NF_CT_ACCT
|
|
if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
|
|
IPCTNL_MSG_CT_GET_CTRZERO)
|
|
memset(&ct->counters, 0, sizeof(ct->counters));
|
|
#endif
|
|
}
|
|
if (cb->args[1]) {
|
|
cb->args[1] = 0;
|
|
goto restart;
|
|
}
|
|
}
|
|
out:
|
|
read_unlock_bh(&nf_conntrack_lock);
|
|
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);
|
|
|
|
l3proto = nf_ct_l3proto_find_get(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);
|
|
}
|
|
|
|
nf_ct_l3proto_put(l3proto);
|
|
|
|
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]);
|
|
|
|
l4proto = nf_ct_l4proto_find_get(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);
|
|
}
|
|
|
|
nf_ct_l4proto_put(l4proto);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_parse_tuple(struct nlattr *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], NULL);
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
|
|
[CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
|
|
[CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
|
|
};
|
|
|
|
static int nfnetlink_parse_nat_proto(struct nlattr *attr,
|
|
const struct nf_conn *ct,
|
|
struct nf_nat_range *range)
|
|
{
|
|
struct nlattr *tb[CTA_PROTONAT_MAX+1];
|
|
const struct nf_nat_protocol *npt;
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
|
|
|
|
if (!npt->nlattr_to_range) {
|
|
nf_nat_proto_put(npt);
|
|
return 0;
|
|
}
|
|
|
|
/* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
|
|
if (npt->nlattr_to_range(tb, range) > 0)
|
|
range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
|
|
|
|
nf_nat_proto_put(npt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
|
|
[CTA_NAT_MINIP] = { .type = NLA_U32 },
|
|
[CTA_NAT_MAXIP] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static inline int
|
|
nfnetlink_parse_nat(struct nlattr *nat,
|
|
const struct nf_conn *ct, struct nf_nat_range *range)
|
|
{
|
|
struct nlattr *tb[CTA_NAT_MAX+1];
|
|
int err;
|
|
|
|
memset(range, 0, sizeof(*range));
|
|
|
|
err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tb[CTA_NAT_MINIP])
|
|
range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
|
|
|
|
if (!tb[CTA_NAT_MAXIP])
|
|
range->max_ip = range->min_ip;
|
|
else
|
|
range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
|
|
|
|
if (range->min_ip)
|
|
range->flags |= IP_NAT_RANGE_MAP_IPS;
|
|
|
|
if (!tb[CTA_NAT_PROTO])
|
|
return 0;
|
|
|
|
err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static inline int
|
|
ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
|
|
{
|
|
struct nlattr *tb[CTA_HELP_MAX+1];
|
|
|
|
nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
|
|
|
|
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_STATUS] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT] = { .type = NLA_U32 },
|
|
[CTA_MARK] = { .type = NLA_U32 },
|
|
[CTA_USE] = { .type = NLA_U32 },
|
|
[CTA_ID] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int
|
|
ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nlattr *cda[])
|
|
{
|
|
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;
|
|
int err = 0;
|
|
|
|
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();
|
|
return 0;
|
|
}
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
h = nf_conntrack_find_get(&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 (del_timer(&ct->timeout))
|
|
ct->timeout.function((unsigned long)ct);
|
|
|
|
nf_ct_put(ct);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nlattr *cda[])
|
|
{
|
|
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;
|
|
int err = 0;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
#ifndef CONFIG_NF_CT_ACCT
|
|
if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
|
|
return -ENOTSUPP;
|
|
#endif
|
|
return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
|
|
ctnetlink_done);
|
|
}
|
|
|
|
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(&tuple);
|
|
if (!h)
|
|
return -ENOENT;
|
|
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
|
|
err = -ENOMEM;
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb2) {
|
|
nf_ct_put(ct);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
|
|
IPCTNL_MSG_CT_NEW, 1, ct);
|
|
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;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_change_status(struct nf_conn *ct, struct nlattr *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 -EINVAL;
|
|
|
|
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
|
|
/* SEEN_REPLY bit can only be set */
|
|
return -EINVAL;
|
|
|
|
|
|
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
|
|
/* ASSURED bit can only be set */
|
|
return -EINVAL;
|
|
|
|
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
|
|
#ifndef CONFIG_NF_NAT_NEEDED
|
|
return -EINVAL;
|
|
#else
|
|
struct nf_nat_range range;
|
|
|
|
if (cda[CTA_NAT_DST]) {
|
|
if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
|
|
&range) < 0)
|
|
return -EINVAL;
|
|
if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
|
|
return -EEXIST;
|
|
nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
|
|
}
|
|
if (cda[CTA_NAT_SRC]) {
|
|
if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
|
|
&range) < 0)
|
|
return -EINVAL;
|
|
if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
|
|
return -EEXIST;
|
|
nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* 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 inline int
|
|
ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
|
|
{
|
|
struct nf_conntrack_helper *helper;
|
|
struct nf_conn_help *help = nfct_help(ct);
|
|
char *helpname;
|
|
int err;
|
|
|
|
/* don't change helper of sibling connections */
|
|
if (ct->master)
|
|
return -EINVAL;
|
|
|
|
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_byname(helpname);
|
|
if (helper == NULL)
|
|
return -EINVAL;
|
|
|
|
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 {
|
|
help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
|
|
if (help == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rcu_assign_pointer(help->helper, helper);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *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 inline int
|
|
ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
|
|
{
|
|
struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
|
|
struct nf_conntrack_l4proto *l4proto;
|
|
u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
|
|
u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
|
|
int err = 0;
|
|
|
|
nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
|
|
|
|
l4proto = nf_ct_l4proto_find_get(l3num, npt);
|
|
|
|
if (l4proto->from_nlattr)
|
|
err = l4proto->from_nlattr(tb, ct);
|
|
nf_ct_l4proto_put(l4proto);
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
static inline int
|
|
change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
|
|
{
|
|
struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
|
|
|
|
nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
|
|
|
|
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, struct nlattr *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, struct nlattr *cda[])
|
|
{
|
|
int err;
|
|
|
|
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 int
|
|
ctnetlink_create_conntrack(struct nlattr *cda[],
|
|
struct nf_conntrack_tuple *otuple,
|
|
struct nf_conntrack_tuple *rtuple,
|
|
struct nf_conn *master_ct)
|
|
{
|
|
struct nf_conn *ct;
|
|
int err = -EINVAL;
|
|
struct nf_conn_help *help;
|
|
struct nf_conntrack_helper *helper;
|
|
|
|
ct = nf_conntrack_alloc(otuple, rtuple);
|
|
if (ct == NULL || IS_ERR(ct))
|
|
return -ENOMEM;
|
|
|
|
if (!cda[CTA_TIMEOUT])
|
|
goto err;
|
|
ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
|
|
|
|
ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
|
|
ct->status |= IPS_CONFIRMED;
|
|
|
|
if (cda[CTA_STATUS]) {
|
|
err = ctnetlink_change_status(ct, cda);
|
|
if (err < 0)
|
|
goto err;
|
|
}
|
|
|
|
if (cda[CTA_PROTOINFO]) {
|
|
err = ctnetlink_change_protoinfo(ct, cda);
|
|
if (err < 0)
|
|
goto err;
|
|
}
|
|
|
|
#if defined(CONFIG_NF_CONNTRACK_MARK)
|
|
if (cda[CTA_MARK])
|
|
ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
|
|
#endif
|
|
|
|
helper = nf_ct_helper_find_get(rtuple);
|
|
if (helper) {
|
|
help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
|
|
if (help == NULL) {
|
|
nf_ct_helper_put(helper);
|
|
err = -ENOMEM;
|
|
goto err;
|
|
}
|
|
/* not in hash table yet so not strictly necessary */
|
|
rcu_assign_pointer(help->helper, helper);
|
|
}
|
|
|
|
/* setup master conntrack: this is a confirmed expectation */
|
|
if (master_ct) {
|
|
__set_bit(IPS_EXPECTED_BIT, &ct->status);
|
|
ct->master = master_ct;
|
|
}
|
|
|
|
add_timer(&ct->timeout);
|
|
nf_conntrack_hash_insert(ct);
|
|
|
|
if (helper)
|
|
nf_ct_helper_put(helper);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
nf_conntrack_free(ct);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nlattr *cda[])
|
|
{
|
|
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;
|
|
int err = 0;
|
|
|
|
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;
|
|
}
|
|
|
|
write_lock_bh(&nf_conntrack_lock);
|
|
if (cda[CTA_TUPLE_ORIG])
|
|
h = __nf_conntrack_find(&otuple, NULL);
|
|
else if (cda[CTA_TUPLE_REPLY])
|
|
h = __nf_conntrack_find(&rtuple, NULL);
|
|
|
|
if (h == NULL) {
|
|
struct nf_conntrack_tuple master;
|
|
struct nf_conntrack_tuple_hash *master_h = NULL;
|
|
struct nf_conn *master_ct = NULL;
|
|
|
|
if (cda[CTA_TUPLE_MASTER]) {
|
|
err = ctnetlink_parse_tuple(cda,
|
|
&master,
|
|
CTA_TUPLE_MASTER,
|
|
u3);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
master_h = __nf_conntrack_find(&master, NULL);
|
|
if (master_h == NULL) {
|
|
err = -ENOENT;
|
|
goto out_unlock;
|
|
}
|
|
master_ct = nf_ct_tuplehash_to_ctrack(master_h);
|
|
atomic_inc(&master_ct->ct_general.use);
|
|
}
|
|
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
err = -ENOENT;
|
|
if (nlh->nlmsg_flags & NLM_F_CREATE)
|
|
err = ctnetlink_create_conntrack(cda,
|
|
&otuple,
|
|
&rtuple,
|
|
master_ct);
|
|
if (err < 0 && master_ct)
|
|
nf_ct_put(master_ct);
|
|
|
|
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)) {
|
|
/* we only allow nat config for new conntracks */
|
|
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
|
|
err = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
/* can't link an existing conntrack to a master */
|
|
if (cda[CTA_TUPLE_MASTER]) {
|
|
err = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
|
|
cda);
|
|
}
|
|
|
|
out_unlock:
|
|
write_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));
|
|
m.src.u.all = mask->src.u.all;
|
|
memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
|
|
|
|
nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
|
|
l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
|
|
ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
|
|
nf_ct_l3proto_put(l3proto);
|
|
|
|
if (unlikely(ret < 0))
|
|
goto nla_put_failure;
|
|
|
|
l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
|
|
ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
|
|
nf_ct_l4proto_put(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;
|
|
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));
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
|
|
int event,
|
|
int nowait,
|
|
const struct nf_conntrack_expect *exp)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
|
|
event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
|
|
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
|
|
nfmsg = NLMSG_DATA(nlh);
|
|
|
|
nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
|
|
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;
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
static int ctnetlink_expect_event(struct notifier_block *this,
|
|
unsigned long events, void *ptr)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
|
|
struct sk_buff *skb;
|
|
unsigned int type;
|
|
sk_buff_data_t b;
|
|
int flags = 0;
|
|
|
|
if (events & IPEXP_NEW) {
|
|
type = IPCTNL_MSG_EXP_NEW;
|
|
flags = NLM_F_CREATE|NLM_F_EXCL;
|
|
} else
|
|
return NOTIFY_DONE;
|
|
|
|
if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
|
|
return NOTIFY_DONE;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return NOTIFY_DONE;
|
|
|
|
b = skb->tail;
|
|
|
|
type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
|
|
nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
|
|
nfmsg = NLMSG_DATA(nlh);
|
|
|
|
nlh->nlmsg_flags = flags;
|
|
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;
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
|
|
return NOTIFY_DONE;
|
|
|
|
nlmsg_failure:
|
|
nla_put_failure:
|
|
kfree_skb(skb);
|
|
return NOTIFY_DONE;
|
|
}
|
|
#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 nf_conntrack_expect *exp, *last;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
|
|
struct hlist_node *n;
|
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
|
|
read_lock_bh(&nf_conntrack_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, &nf_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,
|
|
1, exp) < 0) {
|
|
atomic_inc(&exp->use);
|
|
cb->args[1] = (unsigned long)exp;
|
|
goto out;
|
|
}
|
|
}
|
|
if (cb->args[1]) {
|
|
cb->args[1] = 0;
|
|
goto restart;
|
|
}
|
|
}
|
|
out:
|
|
read_unlock_bh(&nf_conntrack_lock);
|
|
if (last)
|
|
nf_ct_expect_put(last);
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
|
|
[CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
|
|
[CTA_EXPECT_ID] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int
|
|
ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nlattr *cda[])
|
|
{
|
|
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;
|
|
int err = 0;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
return netlink_dump_start(ctnl, skb, nlh,
|
|
ctnetlink_exp_dump_table,
|
|
ctnetlink_exp_done);
|
|
}
|
|
|
|
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(&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 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb2)
|
|
goto out;
|
|
|
|
err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
|
|
nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
|
|
1, exp);
|
|
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,
|
|
struct nlmsghdr *nlh, struct nlattr *cda[])
|
|
{
|
|
struct nf_conntrack_expect *exp;
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conntrack_helper *h;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
|
|
struct hlist_node *n, *next;
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
unsigned int i;
|
|
int err;
|
|
|
|
if (cda[CTA_EXPECT_TUPLE]) {
|
|
/* delete a single expect by tuple */
|
|
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(&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 */
|
|
write_lock_bh(&nf_conntrack_lock);
|
|
h = __nf_conntrack_helper_find_byname(name);
|
|
if (!h) {
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
return -EINVAL;
|
|
}
|
|
for (i = 0; i < nf_ct_expect_hsize; i++) {
|
|
hlist_for_each_entry_safe(exp, n, next,
|
|
&nf_ct_expect_hash[i],
|
|
hnode) {
|
|
m_help = nfct_help(exp->master);
|
|
if (m_help->helper == h
|
|
&& del_timer(&exp->timeout)) {
|
|
nf_ct_unlink_expect(exp);
|
|
nf_ct_expect_put(exp);
|
|
}
|
|
}
|
|
}
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
} else {
|
|
/* This basically means we have to flush everything*/
|
|
write_lock_bh(&nf_conntrack_lock);
|
|
for (i = 0; i < nf_ct_expect_hsize; i++) {
|
|
hlist_for_each_entry_safe(exp, n, next,
|
|
&nf_ct_expect_hash[i],
|
|
hnode) {
|
|
if (del_timer(&exp->timeout)) {
|
|
nf_ct_unlink_expect(exp);
|
|
nf_ct_expect_put(exp);
|
|
}
|
|
}
|
|
}
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
static int
|
|
ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
|
|
{
|
|
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(&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 = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
exp = nf_ct_expect_alloc(ct);
|
|
if (!exp) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
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(exp);
|
|
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,
|
|
struct nlmsghdr *nlh, struct nlattr *cda[])
|
|
{
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conntrack_expect *exp;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
int err = 0;
|
|
|
|
if (!cda[CTA_EXPECT_TUPLE]
|
|
|| !cda[CTA_EXPECT_MASK]
|
|
|| !cda[CTA_EXPECT_MASTER])
|
|
return -EINVAL;
|
|
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
write_lock_bh(&nf_conntrack_lock);
|
|
exp = __nf_ct_expect_find(&tuple);
|
|
|
|
if (!exp) {
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
err = -ENOENT;
|
|
if (nlh->nlmsg_flags & NLM_F_CREATE)
|
|
err = ctnetlink_create_expect(cda, u3);
|
|
return err;
|
|
}
|
|
|
|
err = -EEXIST;
|
|
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
|
|
err = ctnetlink_change_expect(exp, cda);
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
static struct notifier_block ctnl_notifier = {
|
|
.notifier_call = ctnetlink_conntrack_event,
|
|
};
|
|
|
|
static struct notifier_block ctnl_notifier_exp = {
|
|
.notifier_call = 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;
|
|
|
|
printk("ctnetlink v%s: registering with nfnetlink.\n", version);
|
|
ret = nfnetlink_subsys_register(&ctnl_subsys);
|
|
if (ret < 0) {
|
|
printk("ctnetlink_init: cannot register with nfnetlink.\n");
|
|
goto err_out;
|
|
}
|
|
|
|
ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
|
|
if (ret < 0) {
|
|
printk("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) {
|
|
printk("ctnetlink_init: cannot register notifier.\n");
|
|
goto err_unreg_exp_subsys;
|
|
}
|
|
|
|
ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
|
|
if (ret < 0) {
|
|
printk("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)
|
|
{
|
|
printk("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);
|
|
return;
|
|
}
|
|
|
|
module_init(ctnetlink_init);
|
|
module_exit(ctnetlink_exit);
|