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![Daniel Borkmann](/assets/img/avatar_default.png)
This work adds the possibility of deriving the zone id from the skb->mark field in a scalable manner. This allows for having only a single template serving hundreds/thousands of different zones, for example, instead of the need to have one match for each zone as an extra CT jump target. Note that we'd need to have this information attached to the template as at the time when we're trying to lookup a possible ct object, we already need to know zone information for a possible match when going into __nf_conntrack_find_get(). This work provides a minimal implementation for a possible mapping. In order to not add/expose an extra ct->status bit, the zone structure has been extended to carry a flag for deriving the mark. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
3371 lines
81 KiB
C
3371 lines
81 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) 2005-2012 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/security.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_seqadj.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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#include <net/netfilter/nf_conntrack_timestamp.h>
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#include <net/netfilter/nf_conntrack_labels.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_l4proto.h>
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#include <net/netfilter/nf_nat_helper.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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if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
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goto nla_put_failure;
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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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rcu_read_lock();
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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 (ret >= 0) {
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l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
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tuple->dst.protonum);
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ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
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}
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rcu_read_unlock();
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return ret;
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}
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static inline int
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ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
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const struct nf_conntrack_zone *zone, int dir)
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{
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if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
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return 0;
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if (nla_put_be16(skb, attrtype, htons(zone->id)))
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goto nla_put_failure;
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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_status(struct sk_buff *skb, const struct nf_conn *ct)
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{
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if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
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goto nla_put_failure;
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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 = ((long)ct->timeout.expires - (long)jiffies) / HZ;
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if (timeout < 0)
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timeout = 0;
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if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
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goto nla_put_failure;
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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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if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
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goto nla_put_failure;
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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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dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
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enum ip_conntrack_dir dir, int type)
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{
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enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
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struct nf_conn_counter *counter = acct->counter;
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struct nlattr *nest_count;
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u64 pkts, bytes;
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if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
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pkts = atomic64_xchg(&counter[dir].packets, 0);
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bytes = atomic64_xchg(&counter[dir].bytes, 0);
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} else {
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pkts = atomic64_read(&counter[dir].packets);
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bytes = atomic64_read(&counter[dir].bytes);
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}
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nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
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if (!nest_count)
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goto nla_put_failure;
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if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
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nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
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goto nla_put_failure;
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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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static int
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ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
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{
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struct nf_conn_acct *acct = nf_conn_acct_find(ct);
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if (!acct)
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return 0;
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if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
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return -1;
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if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
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return -1;
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return 0;
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}
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static int
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ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
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{
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struct nlattr *nest_count;
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const struct nf_conn_tstamp *tstamp;
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tstamp = nf_conn_tstamp_find(ct);
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if (!tstamp)
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return 0;
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nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
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if (!nest_count)
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goto nla_put_failure;
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if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
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(tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
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cpu_to_be64(tstamp->stop))))
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goto nla_put_failure;
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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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if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
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goto nla_put_failure;
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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_secctx(struct sk_buff *skb, const struct nf_conn *ct)
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{
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struct nlattr *nest_secctx;
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int len, ret;
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char *secctx;
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ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
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if (ret)
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return 0;
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ret = -1;
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nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
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if (!nest_secctx)
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goto nla_put_failure;
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if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
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goto nla_put_failure;
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nla_nest_end(skb, nest_secctx);
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ret = 0;
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nla_put_failure:
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security_release_secctx(secctx, len);
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return ret;
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}
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#else
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#define ctnetlink_dump_secctx(a, b) (0)
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#endif
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#ifdef CONFIG_NF_CONNTRACK_LABELS
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static int ctnetlink_label_size(const struct nf_conn *ct)
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{
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struct nf_conn_labels *labels = nf_ct_labels_find(ct);
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if (!labels)
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return 0;
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return nla_total_size(labels->words * sizeof(long));
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}
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static int
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ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
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{
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struct nf_conn_labels *labels = nf_ct_labels_find(ct);
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unsigned int len, i;
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if (!labels)
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return 0;
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len = labels->words * sizeof(long);
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i = 0;
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do {
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if (labels->bits[i] != 0)
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return nla_put(skb, CTA_LABELS, len, labels->bits);
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i++;
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} while (i < labels->words);
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return 0;
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}
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#else
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#define ctnetlink_dump_labels(a, b) (0)
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#define ctnetlink_label_size(a) (0)
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#endif
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|
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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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|
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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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|
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return 0;
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|
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nla_put_failure:
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return -1;
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|
}
|
|
|
|
static int
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dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
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{
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struct nlattr *nest_parms;
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|
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nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
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|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
|
|
htonl(seq->correction_pos)) ||
|
|
nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
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|
htonl(seq->offset_before)) ||
|
|
nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
|
|
htonl(seq->offset_after)))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
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|
{
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|
struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
|
|
struct nf_ct_seqadj *seq;
|
|
|
|
if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
|
|
return 0;
|
|
|
|
seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
|
|
if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
|
|
return -1;
|
|
|
|
seq = &seqadj->seq[IP_CT_DIR_REPLY];
|
|
if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
|
|
{
|
|
if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
|
|
goto nla_put_failure;
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
|
|
{
|
|
if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
|
|
goto nla_put_failure;
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
|
|
struct nf_conn *ct)
|
|
{
|
|
const struct nf_conntrack_zone *zone;
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
struct nlattr *nest_parms;
|
|
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
|
|
|
|
event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
|
|
nlh = nlmsg_put(skb, portid, seq, event, 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;
|
|
|
|
zone = nf_ct_zone(ct);
|
|
|
|
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;
|
|
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
|
|
NF_CT_ZONE_DIR_ORIG) < 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;
|
|
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
|
|
NF_CT_ZONE_DIR_REPL) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
|
|
NF_CT_DEFAULT_ZONE_DIR) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (ctnetlink_dump_status(skb, ct) < 0 ||
|
|
ctnetlink_dump_timeout(skb, ct) < 0 ||
|
|
ctnetlink_dump_acct(skb, ct, type) < 0 ||
|
|
ctnetlink_dump_timestamp(skb, ct) < 0 ||
|
|
ctnetlink_dump_protoinfo(skb, ct) < 0 ||
|
|
ctnetlink_dump_helpinfo(skb, ct) < 0 ||
|
|
ctnetlink_dump_mark(skb, ct) < 0 ||
|
|
ctnetlink_dump_secctx(skb, ct) < 0 ||
|
|
ctnetlink_dump_labels(skb, ct) < 0 ||
|
|
ctnetlink_dump_id(skb, ct) < 0 ||
|
|
ctnetlink_dump_use(skb, ct) < 0 ||
|
|
ctnetlink_dump_master(skb, ct) < 0 ||
|
|
ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static inline size_t
|
|
ctnetlink_proto_size(const struct nf_conn *ct)
|
|
{
|
|
struct nf_conntrack_l3proto *l3proto;
|
|
struct nf_conntrack_l4proto *l4proto;
|
|
size_t len = 0;
|
|
|
|
rcu_read_lock();
|
|
l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
|
|
len += l3proto->nla_size;
|
|
|
|
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
|
|
len += l4proto->nla_size;
|
|
rcu_read_unlock();
|
|
|
|
return len;
|
|
}
|
|
|
|
static inline size_t
|
|
ctnetlink_acct_size(const struct nf_conn *ct)
|
|
{
|
|
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 int
|
|
ctnetlink_secctx_size(const struct nf_conn *ct)
|
|
{
|
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
|
int len, ret;
|
|
|
|
ret = security_secid_to_secctx(ct->secmark, NULL, &len);
|
|
if (ret)
|
|
return 0;
|
|
|
|
return nla_total_size(0) /* CTA_SECCTX */
|
|
+ nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static inline size_t
|
|
ctnetlink_timestamp_size(const struct nf_conn *ct)
|
|
{
|
|
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
|
|
if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
|
|
return 0;
|
|
return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
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 */
|
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
|
|
+ ctnetlink_acct_size(ct)
|
|
+ ctnetlink_timestamp_size(ct)
|
|
+ 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 */
|
|
+ ctnetlink_secctx_size(ct)
|
|
#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
|
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
|
+ nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
|
|
#endif
|
|
+ ctnetlink_proto_size(ct)
|
|
+ ctnetlink_label_size(ct)
|
|
;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
static int
|
|
ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
|
|
{
|
|
const struct nf_conntrack_zone *zone;
|
|
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 (nf_ct_is_untracked(ct))
|
|
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->portid, 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();
|
|
zone = nf_ct_zone(ct);
|
|
|
|
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;
|
|
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
|
|
NF_CT_ZONE_DIR_ORIG) < 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;
|
|
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
|
|
NF_CT_ZONE_DIR_REPL) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
|
|
NF_CT_DEFAULT_ZONE_DIR) < 0)
|
|
goto nla_put_failure;
|
|
|
|
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_acct(skb, ct, type) < 0 ||
|
|
ctnetlink_dump_timestamp(skb, ct) < 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_secctx(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
if (events & (1 << IPCT_LABEL) &&
|
|
ctnetlink_dump_labels(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (events & (1 << IPCT_RELATED) &&
|
|
ctnetlink_dump_master(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (events & (1 << IPCT_SEQADJ) &&
|
|
ctnetlink_dump_ct_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->portid, 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]);
|
|
kfree(cb->data);
|
|
return 0;
|
|
}
|
|
|
|
struct ctnetlink_filter {
|
|
struct {
|
|
u_int32_t val;
|
|
u_int32_t mask;
|
|
} mark;
|
|
};
|
|
|
|
static struct ctnetlink_filter *
|
|
ctnetlink_alloc_filter(const struct nlattr * const cda[])
|
|
{
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
struct ctnetlink_filter *filter;
|
|
|
|
filter = kzalloc(sizeof(*filter), GFP_KERNEL);
|
|
if (filter == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
|
|
filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
|
|
|
|
return filter;
|
|
#else
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
#endif
|
|
}
|
|
|
|
static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
|
|
{
|
|
struct ctnetlink_filter *filter = data;
|
|
|
|
if (filter == NULL)
|
|
return 1;
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
if ((ct->mark & filter->mark.mask) == filter->mark.val)
|
|
return 1;
|
|
#endif
|
|
|
|
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;
|
|
int res;
|
|
spinlock_t *lockp;
|
|
|
|
last = (struct nf_conn *)cb->args[1];
|
|
|
|
local_bh_disable();
|
|
for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
|
|
restart:
|
|
lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
|
|
spin_lock(lockp);
|
|
if (cb->args[0] >= net->ct.htable_size) {
|
|
spin_unlock(lockp);
|
|
goto out;
|
|
}
|
|
hlist_nulls_for_each_entry(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);
|
|
/* 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)
|
|
continue;
|
|
if (cb->args[1]) {
|
|
if (ct != last)
|
|
continue;
|
|
cb->args[1] = 0;
|
|
}
|
|
if (!ctnetlink_filter_match(ct, cb->data))
|
|
continue;
|
|
|
|
rcu_read_lock();
|
|
res =
|
|
ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
|
|
ct);
|
|
rcu_read_unlock();
|
|
if (res < 0) {
|
|
nf_conntrack_get(&ct->ct_general);
|
|
cb->args[1] = (unsigned long)ct;
|
|
spin_unlock(lockp);
|
|
goto out;
|
|
}
|
|
}
|
|
spin_unlock(lockp);
|
|
if (cb->args[1]) {
|
|
cb->args[1] = 0;
|
|
goto restart;
|
|
}
|
|
}
|
|
out:
|
|
local_bh_enable();
|
|
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;
|
|
|
|
ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
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 int
|
|
ctnetlink_parse_zone(const struct nlattr *attr,
|
|
struct nf_conntrack_zone *zone)
|
|
{
|
|
nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
|
|
NF_CT_DEFAULT_ZONE_DIR, 0);
|
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
|
if (attr)
|
|
zone->id = ntohs(nla_get_be16(attr));
|
|
#else
|
|
if (attr)
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
|
|
struct nf_conntrack_zone *zone)
|
|
{
|
|
int ret;
|
|
|
|
if (zone->id != NF_CT_DEFAULT_ZONE_ID)
|
|
return -EINVAL;
|
|
|
|
ret = ctnetlink_parse_zone(attr, zone);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (type == CTA_TUPLE_REPLY)
|
|
zone->dir = NF_CT_ZONE_DIR_REPL;
|
|
else
|
|
zone->dir = NF_CT_ZONE_DIR_ORIG;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
|
|
[CTA_TUPLE_IP] = { .type = NLA_NESTED },
|
|
[CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
|
|
[CTA_TUPLE_ZONE] = { .type = NLA_U16 },
|
|
};
|
|
|
|
static int
|
|
ctnetlink_parse_tuple(const struct nlattr * const cda[],
|
|
struct nf_conntrack_tuple *tuple,
|
|
enum ctattr_type type, u_int8_t l3num,
|
|
struct nf_conntrack_zone *zone)
|
|
{
|
|
struct nlattr *tb[CTA_TUPLE_MAX+1];
|
|
int err;
|
|
|
|
memset(tuple, 0, sizeof(*tuple));
|
|
|
|
err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
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;
|
|
|
|
if (tb[CTA_TUPLE_ZONE]) {
|
|
if (!zone)
|
|
return -EINVAL;
|
|
|
|
err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
|
|
type, zone);
|
|
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 const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
|
|
[CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
|
|
.len = NF_CT_HELPER_NAME_LEN - 1 },
|
|
};
|
|
|
|
static inline int
|
|
ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
|
|
struct nlattr **helpinfo)
|
|
{
|
|
int err;
|
|
struct nlattr *tb[CTA_HELP_MAX+1];
|
|
|
|
err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[CTA_HELP_NAME])
|
|
return -EINVAL;
|
|
|
|
*helper_name = nla_data(tb[CTA_HELP_NAME]);
|
|
|
|
if (tb[CTA_HELP_INFO])
|
|
*helpinfo = tb[CTA_HELP_INFO];
|
|
|
|
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_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
|
|
[CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
|
|
[CTA_ZONE] = { .type = NLA_U16 },
|
|
[CTA_MARK_MASK] = { .type = NLA_U32 },
|
|
[CTA_LABELS] = { .type = NLA_BINARY,
|
|
.len = NF_CT_LABELS_MAX_SIZE },
|
|
[CTA_LABELS_MASK] = { .type = NLA_BINARY,
|
|
.len = NF_CT_LABELS_MAX_SIZE },
|
|
};
|
|
|
|
static int ctnetlink_flush_conntrack(struct net *net,
|
|
const struct nlattr * const cda[],
|
|
u32 portid, int report)
|
|
{
|
|
struct ctnetlink_filter *filter = NULL;
|
|
|
|
if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
|
|
filter = ctnetlink_alloc_filter(cda);
|
|
if (IS_ERR(filter))
|
|
return PTR_ERR(filter);
|
|
}
|
|
|
|
nf_ct_iterate_cleanup(net, ctnetlink_filter_match, filter,
|
|
portid, report);
|
|
kfree(filter);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
struct nf_conntrack_zone 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, &zone);
|
|
else if (cda[CTA_TUPLE_REPLY])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
|
|
u3, &zone);
|
|
else {
|
|
return ctnetlink_flush_conntrack(net, cda,
|
|
NETLINK_CB(skb).portid,
|
|
nlmsg_report(nlh));
|
|
}
|
|
|
|
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 (del_timer(&ct->timeout))
|
|
nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
|
|
|
|
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;
|
|
struct nf_conntrack_zone zone;
|
|
int err;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = ctnetlink_dump_table,
|
|
.done = ctnetlink_done,
|
|
};
|
|
|
|
if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
|
|
struct ctnetlink_filter *filter;
|
|
|
|
filter = ctnetlink_alloc_filter(cda);
|
|
if (IS_ERR(filter))
|
|
return PTR_ERR(filter);
|
|
|
|
c.data = filter;
|
|
}
|
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
|
}
|
|
|
|
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, &zone);
|
|
else if (cda[CTA_TUPLE_REPLY])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
|
|
u3, &zone);
|
|
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).portid, nlh->nlmsg_seq,
|
|
NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
|
|
rcu_read_unlock();
|
|
nf_ct_put(ct);
|
|
if (err <= 0)
|
|
goto free;
|
|
|
|
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
return 0;
|
|
|
|
free:
|
|
kfree_skb(skb2);
|
|
out:
|
|
/* this avoids a loop in nfnetlink. */
|
|
return err == -EAGAIN ? -ENOBUFS : err;
|
|
}
|
|
|
|
static int ctnetlink_done_list(struct netlink_callback *cb)
|
|
{
|
|
if (cb->args[1])
|
|
nf_ct_put((struct nf_conn *)cb->args[1]);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
|
|
{
|
|
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;
|
|
int res;
|
|
int cpu;
|
|
struct hlist_nulls_head *list;
|
|
struct net *net = sock_net(skb->sk);
|
|
|
|
if (cb->args[2])
|
|
return 0;
|
|
|
|
last = (struct nf_conn *)cb->args[1];
|
|
|
|
for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
|
|
struct ct_pcpu *pcpu;
|
|
|
|
if (!cpu_possible(cpu))
|
|
continue;
|
|
|
|
pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
|
|
spin_lock_bh(&pcpu->lock);
|
|
list = dying ? &pcpu->dying : &pcpu->unconfirmed;
|
|
restart:
|
|
hlist_nulls_for_each_entry(h, n, list, hnnode) {
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
if (l3proto && nf_ct_l3num(ct) != l3proto)
|
|
continue;
|
|
if (cb->args[1]) {
|
|
if (ct != last)
|
|
continue;
|
|
cb->args[1] = 0;
|
|
}
|
|
rcu_read_lock();
|
|
res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
|
|
ct);
|
|
rcu_read_unlock();
|
|
if (res < 0) {
|
|
if (!atomic_inc_not_zero(&ct->ct_general.use))
|
|
continue;
|
|
cb->args[0] = cpu;
|
|
cb->args[1] = (unsigned long)ct;
|
|
spin_unlock_bh(&pcpu->lock);
|
|
goto out;
|
|
}
|
|
}
|
|
if (cb->args[1]) {
|
|
cb->args[1] = 0;
|
|
goto restart;
|
|
}
|
|
spin_unlock_bh(&pcpu->lock);
|
|
}
|
|
cb->args[2] = 1;
|
|
out:
|
|
if (last)
|
|
nf_ct_put(last);
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
return ctnetlink_dump_list(skb, cb, true);
|
|
}
|
|
|
|
static int
|
|
ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = ctnetlink_dump_dying,
|
|
.done = ctnetlink_done_list,
|
|
};
|
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
return ctnetlink_dump_list(skb, cb, false);
|
|
}
|
|
|
|
static int
|
|
ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = ctnetlink_dump_unconfirmed,
|
|
.done = ctnetlink_done_list,
|
|
};
|
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
#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;
|
|
int err;
|
|
|
|
parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
|
|
if (!parse_nat_setup) {
|
|
#ifdef CONFIG_MODULES
|
|
rcu_read_unlock();
|
|
nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
|
|
if (request_module("nf-nat") < 0) {
|
|
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
|
|
rcu_read_lock();
|
|
return -EOPNOTSUPP;
|
|
}
|
|
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
|
|
rcu_read_lock();
|
|
if (nfnetlink_parse_nat_setup_hook)
|
|
return -EAGAIN;
|
|
#endif
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
err = parse_nat_setup(ct, manip, attr);
|
|
if (err == -EAGAIN) {
|
|
#ifdef CONFIG_MODULES
|
|
rcu_read_unlock();
|
|
nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
|
|
if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
|
|
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
|
|
rcu_read_lock();
|
|
return -EOPNOTSUPP;
|
|
}
|
|
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
|
|
rcu_read_lock();
|
|
#else
|
|
err = -EOPNOTSUPP;
|
|
#endif
|
|
}
|
|
return err;
|
|
}
|
|
#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_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
|
|
{
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
int ret;
|
|
|
|
if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
|
|
return 0;
|
|
|
|
ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
|
|
cda[CTA_NAT_DST]);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
|
|
cda[CTA_NAT_SRC]);
|
|
return ret;
|
|
#else
|
|
if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
|
|
return 0;
|
|
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;
|
|
struct nlattr *helpinfo = NULL;
|
|
int err;
|
|
|
|
/* don't change helper of sibling connections */
|
|
if (ct->master)
|
|
return -EBUSY;
|
|
|
|
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!strcmp(helpname, "")) {
|
|
if (help && help->helper) {
|
|
/* we had a helper before ... */
|
|
nf_ct_remove_expectations(ct);
|
|
RCU_INIT_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_expect_lock);
|
|
|
|
if (request_module("nfct-helper-%s", helpname) < 0) {
|
|
spin_lock_bh(&nf_conntrack_expect_lock);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
spin_lock_bh(&nf_conntrack_expect_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) {
|
|
/* update private helper data if allowed. */
|
|
if (helper->from_nlattr)
|
|
helper->from_nlattr(helpinfo, ct);
|
|
return 0;
|
|
} else
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* we cannot set a helper for an existing conntrack */
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
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;
|
|
|
|
err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
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;
|
|
}
|
|
|
|
static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
|
|
[CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
|
|
[CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
|
|
[CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static inline int
|
|
change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
|
|
{
|
|
int err;
|
|
struct nlattr *cda[CTA_SEQADJ_MAX+1];
|
|
|
|
err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!cda[CTA_SEQADJ_CORRECTION_POS])
|
|
return -EINVAL;
|
|
|
|
seq->correction_pos =
|
|
ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
|
|
|
|
if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
|
|
return -EINVAL;
|
|
|
|
seq->offset_before =
|
|
ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
|
|
|
|
if (!cda[CTA_SEQADJ_OFFSET_AFTER])
|
|
return -EINVAL;
|
|
|
|
seq->offset_after =
|
|
ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_change_seq_adj(struct nf_conn *ct,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
|
|
int ret = 0;
|
|
|
|
if (!seqadj)
|
|
return 0;
|
|
|
|
if (cda[CTA_SEQ_ADJ_ORIG]) {
|
|
ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
|
|
cda[CTA_SEQ_ADJ_ORIG]);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ct->status |= IPS_SEQ_ADJUST;
|
|
}
|
|
|
|
if (cda[CTA_SEQ_ADJ_REPLY]) {
|
|
ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
|
|
cda[CTA_SEQ_ADJ_REPLY]);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ct->status |= IPS_SEQ_ADJUST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
|
|
{
|
|
#ifdef CONFIG_NF_CONNTRACK_LABELS
|
|
size_t len = nla_len(cda[CTA_LABELS]);
|
|
const void *mask = cda[CTA_LABELS_MASK];
|
|
|
|
if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
|
|
return -EINVAL;
|
|
|
|
if (mask) {
|
|
if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
|
|
nla_len(cda[CTA_LABELS_MASK]) != len)
|
|
return -EINVAL;
|
|
mask = nla_data(cda[CTA_LABELS_MASK]);
|
|
}
|
|
|
|
len /= sizeof(u32);
|
|
|
|
return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
|
|
#else
|
|
return -EOPNOTSUPP;
|
|
#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
|
|
|
|
if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
|
|
err = ctnetlink_change_seq_adj(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_LABELS]) {
|
|
err = ctnetlink_attach_labels(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nf_conn *
|
|
ctnetlink_create_conntrack(struct net *net,
|
|
const struct nf_conntrack_zone *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;
|
|
struct nf_conn_tstamp *tstamp;
|
|
|
|
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;
|
|
struct nlattr *helpinfo = NULL;
|
|
|
|
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
|
|
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, helper, GFP_ATOMIC);
|
|
if (help == NULL) {
|
|
err = -ENOMEM;
|
|
goto err2;
|
|
}
|
|
/* set private helper data if allowed. */
|
|
if (helper->from_nlattr)
|
|
helper->from_nlattr(helpinfo, ct);
|
|
|
|
/* not in hash table yet so not strictly necessary */
|
|
RCU_INIT_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;
|
|
}
|
|
|
|
err = ctnetlink_setup_nat(ct, cda);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
nf_ct_acct_ext_add(ct, GFP_ATOMIC);
|
|
nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
|
|
nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
|
|
nf_ct_labels_ext_add(ct);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
|
|
err = ctnetlink_change_seq_adj(ct, cda);
|
|
if (err < 0)
|
|
goto err2;
|
|
}
|
|
|
|
memset(&ct->proto, 0, sizeof(ct->proto));
|
|
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, NULL);
|
|
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;
|
|
}
|
|
tstamp = nf_conn_tstamp_find(ct);
|
|
if (tstamp)
|
|
tstamp->start = ktime_get_real_ns();
|
|
|
|
err = nf_conntrack_hash_check_insert(ct);
|
|
if (err < 0)
|
|
goto err2;
|
|
|
|
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);
|
|
struct nf_conn *ct;
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
struct nf_conntrack_zone 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, &zone);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_TUPLE_REPLY]) {
|
|
err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
|
|
u3, &zone);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_TUPLE_ORIG])
|
|
h = nf_conntrack_find_get(net, &zone, &otuple);
|
|
else if (cda[CTA_TUPLE_REPLY])
|
|
h = nf_conntrack_find_get(net, &zone, &rtuple);
|
|
|
|
if (h == NULL) {
|
|
err = -ENOENT;
|
|
if (nlh->nlmsg_flags & NLM_F_CREATE) {
|
|
enum ip_conntrack_events events;
|
|
|
|
if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
|
|
return -EINVAL;
|
|
|
|
ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
|
|
&rtuple, u3);
|
|
if (IS_ERR(ct))
|
|
return PTR_ERR(ct);
|
|
|
|
err = 0;
|
|
if (test_bit(IPS_EXPECTED_BIT, &ct->status))
|
|
events = IPCT_RELATED;
|
|
else
|
|
events = IPCT_NEW;
|
|
|
|
if (cda[CTA_LABELS] &&
|
|
ctnetlink_attach_labels(ct, cda) == 0)
|
|
events |= (1 << IPCT_LABEL);
|
|
|
|
nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
|
|
(1 << IPCT_ASSURED) |
|
|
(1 << IPCT_HELPER) |
|
|
(1 << IPCT_PROTOINFO) |
|
|
(1 << IPCT_SEQADJ) |
|
|
(1 << IPCT_MARK) | events,
|
|
ct, NETLINK_CB(skb).portid,
|
|
nlmsg_report(nlh));
|
|
nf_ct_put(ct);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
/* implicit 'else' */
|
|
|
|
err = -EEXIST;
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
|
|
spin_lock_bh(&nf_conntrack_expect_lock);
|
|
err = ctnetlink_change_conntrack(ct, cda);
|
|
spin_unlock_bh(&nf_conntrack_expect_lock);
|
|
if (err == 0) {
|
|
nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
|
|
(1 << IPCT_ASSURED) |
|
|
(1 << IPCT_HELPER) |
|
|
(1 << IPCT_LABEL) |
|
|
(1 << IPCT_PROTOINFO) |
|
|
(1 << IPCT_SEQADJ) |
|
|
(1 << IPCT_MARK),
|
|
ct, NETLINK_CB(skb).portid,
|
|
nlmsg_report(nlh));
|
|
}
|
|
}
|
|
|
|
nf_ct_put(ct);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
|
|
__u16 cpu, const struct ip_conntrack_stat *st)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
|
|
|
|
event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
|
|
if (nlh == NULL)
|
|
goto nlmsg_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = AF_UNSPEC;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = htons(cpu);
|
|
|
|
if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
|
|
nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
|
|
nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
|
|
nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
|
|
nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
|
|
nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
|
|
nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
|
|
nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
|
|
nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
|
|
htonl(st->insert_failed)) ||
|
|
nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
|
|
nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
|
|
nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
|
|
nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
|
|
htonl(st->search_restart)))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nlmsg_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int cpu;
|
|
struct net *net = sock_net(skb->sk);
|
|
|
|
if (cb->args[0] == nr_cpu_ids)
|
|
return 0;
|
|
|
|
for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
|
|
const struct ip_conntrack_stat *st;
|
|
|
|
if (!cpu_possible(cpu))
|
|
continue;
|
|
|
|
st = per_cpu_ptr(net->ct.stat, cpu);
|
|
if (ctnetlink_ct_stat_cpu_fill_info(skb,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
cpu, st) < 0)
|
|
break;
|
|
}
|
|
cb->args[0] = cpu;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = ctnetlink_ct_stat_cpu_dump,
|
|
};
|
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
|
|
struct net *net)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
|
|
unsigned int nr_conntracks = atomic_read(&net->ct.count);
|
|
|
|
event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
|
|
if (nlh == NULL)
|
|
goto nlmsg_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = AF_UNSPEC;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nlmsg_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
struct sk_buff *skb2;
|
|
int err;
|
|
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (skb2 == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq,
|
|
NFNL_MSG_TYPE(nlh->nlmsg_type),
|
|
sock_net(skb->sk));
|
|
if (err <= 0)
|
|
goto free;
|
|
|
|
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
return 0;
|
|
|
|
free:
|
|
kfree_skb(skb2);
|
|
out:
|
|
/* this avoids a loop in nfnetlink. */
|
|
return err == -EAGAIN ? -ENOBUFS : err;
|
|
}
|
|
|
|
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,
|
|
.len = NF_CT_HELPER_NAME_LEN - 1 },
|
|
[CTA_EXPECT_ZONE] = { .type = NLA_U16 },
|
|
[CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
|
|
[CTA_EXPECT_CLASS] = { .type = NLA_U32 },
|
|
[CTA_EXPECT_NAT] = { .type = NLA_NESTED },
|
|
[CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
|
|
};
|
|
|
|
static struct nf_conntrack_expect *
|
|
ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
|
|
struct nf_conntrack_helper *helper,
|
|
struct nf_conntrack_tuple *tuple,
|
|
struct nf_conntrack_tuple *mask);
|
|
|
|
#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
|
|
static size_t
|
|
ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
|
|
{
|
|
return 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 */
|
|
+ nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
|
|
+ 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 */
|
|
+ ctnetlink_secctx_size(ct)
|
|
#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
|
|
#ifdef CONFIG_NF_CONNTRACK_ZONES
|
|
+ nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
|
|
#endif
|
|
+ ctnetlink_proto_size(ct)
|
|
;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
|
|
{
|
|
const struct nf_conntrack_zone *zone;
|
|
struct nlattr *nest_parms;
|
|
|
|
rcu_read_lock();
|
|
zone = nf_ct_zone(ct);
|
|
|
|
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;
|
|
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
|
|
NF_CT_ZONE_DIR_ORIG) < 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;
|
|
if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
|
|
NF_CT_ZONE_DIR_REPL) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
|
|
NF_CT_DEFAULT_ZONE_DIR) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (ctnetlink_dump_id(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (ctnetlink_dump_status(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (ctnetlink_dump_timeout(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (ctnetlink_dump_protoinfo(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (ctnetlink_dump_helpinfo(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_SECMARK
|
|
if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if ((ct->status & IPS_SEQ_ADJUST) &&
|
|
ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_MARK
|
|
if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
if (ctnetlink_dump_labels(skb, ct) < 0)
|
|
goto nla_put_failure;
|
|
rcu_read_unlock();
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
rcu_read_unlock();
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
|
|
{
|
|
int 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_HELP]) {
|
|
err = ctnetlink_change_helper(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
if (cda[CTA_LABELS]) {
|
|
err = ctnetlink_attach_labels(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
#if defined(CONFIG_NF_CONNTRACK_MARK)
|
|
if (cda[CTA_MARK]) {
|
|
u32 mask = 0, mark, newmark;
|
|
if (cda[CTA_MARK_MASK])
|
|
mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
|
|
|
|
mark = ntohl(nla_get_be32(cda[CTA_MARK]));
|
|
newmark = (ct->mark & mask) ^ mark;
|
|
if (newmark != ct->mark)
|
|
ct->mark = newmark;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
|
|
{
|
|
struct nlattr *cda[CTA_MAX+1];
|
|
int ret;
|
|
|
|
ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
spin_lock_bh(&nf_conntrack_expect_lock);
|
|
ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
|
|
spin_unlock_bh(&nf_conntrack_expect_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
|
|
const struct nf_conn *ct,
|
|
struct nf_conntrack_tuple *tuple,
|
|
struct nf_conntrack_tuple *mask)
|
|
{
|
|
int err;
|
|
|
|
err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
|
|
nf_ct_l3num(ct), NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
|
|
nf_ct_l3num(ct), NULL);
|
|
}
|
|
|
|
static int
|
|
ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
|
|
u32 portid, u32 report)
|
|
{
|
|
struct nlattr *cda[CTA_EXPECT_MAX+1];
|
|
struct nf_conntrack_tuple tuple, mask;
|
|
struct nf_conntrack_helper *helper = NULL;
|
|
struct nf_conntrack_expect *exp;
|
|
int err;
|
|
|
|
err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
|
|
ct, &tuple, &mask);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cda[CTA_EXPECT_HELP_NAME]) {
|
|
const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
|
|
|
|
helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
|
|
nf_ct_protonum(ct));
|
|
if (helper == NULL)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
|
|
helper, &tuple, &mask);
|
|
if (IS_ERR(exp))
|
|
return PTR_ERR(exp);
|
|
|
|
err = nf_ct_expect_related_report(exp, portid, report);
|
|
if (err < 0) {
|
|
nf_ct_expect_put(exp);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
|
|
.build_size = ctnetlink_nfqueue_build_size,
|
|
.build = ctnetlink_nfqueue_build,
|
|
.parse = ctnetlink_nfqueue_parse,
|
|
.attach_expect = ctnetlink_nfqueue_attach_expect,
|
|
.seq_adjust = nf_ct_tcp_seqadj_set,
|
|
};
|
|
#endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
|
|
|
|
/***********************************************************************
|
|
* 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;
|
|
|
|
rcu_read_lock();
|
|
l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
|
|
ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
|
|
if (ret >= 0) {
|
|
l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
|
|
tuple->dst.protonum);
|
|
ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (unlikely(ret < 0))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static const union nf_inet_addr any_addr;
|
|
|
|
static int
|
|
ctnetlink_exp_dump_expect(struct sk_buff *skb,
|
|
const struct nf_conntrack_expect *exp)
|
|
{
|
|
struct nf_conn *master = exp->master;
|
|
long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
|
|
struct nf_conn_help *help;
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
struct nlattr *nest_parms;
|
|
struct nf_conntrack_tuple nat_tuple = {};
|
|
#endif
|
|
struct nf_ct_helper_expectfn *expfn;
|
|
|
|
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;
|
|
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
|
|
exp->saved_proto.all) {
|
|
nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
|
|
goto nla_put_failure;
|
|
|
|
nat_tuple.src.l3num = nf_ct_l3num(master);
|
|
nat_tuple.src.u3 = exp->saved_addr;
|
|
nat_tuple.dst.protonum = nf_ct_protonum(master);
|
|
nat_tuple.src.u = exp->saved_proto;
|
|
|
|
if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
|
|
CTA_EXPECT_NAT_TUPLE) < 0)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
}
|
|
#endif
|
|
if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
|
|
nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
|
|
nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
|
|
nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
|
|
goto nla_put_failure;
|
|
help = nfct_help(master);
|
|
if (help) {
|
|
struct nf_conntrack_helper *helper;
|
|
|
|
helper = rcu_dereference(help->helper);
|
|
if (helper &&
|
|
nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
|
|
goto nla_put_failure;
|
|
}
|
|
expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
|
|
if (expfn != NULL &&
|
|
nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
|
|
goto nla_put_failure;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
|
|
int event, const struct nf_conntrack_expect *exp)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
unsigned int flags = portid ? NLM_F_MULTI : 0;
|
|
|
|
event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
|
|
nlh = nlmsg_put(skb, portid, 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, group;
|
|
int flags = 0;
|
|
|
|
if (events & (1 << IPEXP_DESTROY)) {
|
|
type = IPCTNL_MSG_EXP_DELETE;
|
|
group = NFNLGRP_CONNTRACK_EXP_DESTROY;
|
|
} else if (events & (1 << IPEXP_NEW)) {
|
|
type = IPCTNL_MSG_EXP_NEW;
|
|
flags = NLM_F_CREATE|NLM_F_EXCL;
|
|
group = NFNLGRP_CONNTRACK_EXP_NEW;
|
|
} else
|
|
return 0;
|
|
|
|
if (!item->report && !nfnetlink_has_listeners(net, group))
|
|
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->portid, 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->portid, group, 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);
|
|
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, &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).portid,
|
|
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 int
|
|
ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nf_conntrack_expect *exp, *last;
|
|
struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
|
|
struct nf_conn *ct = cb->data;
|
|
struct nf_conn_help *help = nfct_help(ct);
|
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
|
|
if (cb->args[0])
|
|
return 0;
|
|
|
|
rcu_read_lock();
|
|
last = (struct nf_conntrack_expect *)cb->args[1];
|
|
restart:
|
|
hlist_for_each_entry(exp, &help->expectations, lnode) {
|
|
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).portid,
|
|
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;
|
|
}
|
|
cb->args[0] = 1;
|
|
out:
|
|
rcu_read_unlock();
|
|
if (last)
|
|
nf_ct_expect_put(last);
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
int err;
|
|
struct net *net = sock_net(ctnl);
|
|
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conntrack_tuple_hash *h;
|
|
struct nf_conn *ct;
|
|
struct nf_conntrack_zone zone;
|
|
struct netlink_dump_control c = {
|
|
.dump = ctnetlink_exp_ct_dump_table,
|
|
.done = ctnetlink_exp_done,
|
|
};
|
|
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
|
|
u3, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
h = nf_conntrack_find_get(net, &zone, &tuple);
|
|
if (!h)
|
|
return -ENOENT;
|
|
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
c.data = ct;
|
|
|
|
err = netlink_dump_start(ctnl, skb, nlh, &c);
|
|
nf_ct_put(ct);
|
|
|
|
return err;
|
|
}
|
|
|
|
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;
|
|
struct nf_conntrack_zone zone;
|
|
int err;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
if (cda[CTA_EXPECT_MASTER])
|
|
return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
|
|
else {
|
|
struct netlink_dump_control c = {
|
|
.dump = ctnetlink_exp_dump_table,
|
|
.done = ctnetlink_exp_done,
|
|
};
|
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
|
}
|
|
}
|
|
|
|
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cda[CTA_EXPECT_TUPLE])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
|
|
u3, NULL);
|
|
else if (cda[CTA_EXPECT_MASTER])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
|
|
u3, NULL);
|
|
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) {
|
|
nf_ct_expect_put(exp);
|
|
goto out;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
|
|
nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
|
|
rcu_read_unlock();
|
|
nf_ct_expect_put(exp);
|
|
if (err <= 0)
|
|
goto free;
|
|
|
|
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
return 0;
|
|
|
|
free:
|
|
kfree_skb(skb2);
|
|
out:
|
|
/* this avoids a loop in nfnetlink. */
|
|
return err == -EAGAIN ? -ENOBUFS : 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 *next;
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
struct nf_conntrack_zone zone;
|
|
unsigned int i;
|
|
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, NULL);
|
|
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 */
|
|
spin_lock_bh(&nf_conntrack_expect_lock);
|
|
if (del_timer(&exp->timeout)) {
|
|
nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
|
|
nlmsg_report(nlh));
|
|
nf_ct_expect_put(exp);
|
|
}
|
|
spin_unlock_bh(&nf_conntrack_expect_lock);
|
|
/* 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_expect_lock);
|
|
for (i = 0; i < nf_ct_expect_hsize; i++) {
|
|
hlist_for_each_entry_safe(exp, 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_report(exp,
|
|
NETLINK_CB(skb).portid,
|
|
nlmsg_report(nlh));
|
|
nf_ct_expect_put(exp);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_bh(&nf_conntrack_expect_lock);
|
|
} else {
|
|
/* This basically means we have to flush everything*/
|
|
spin_lock_bh(&nf_conntrack_expect_lock);
|
|
for (i = 0; i < nf_ct_expect_hsize; i++) {
|
|
hlist_for_each_entry_safe(exp, next,
|
|
&net->ct.expect_hash[i],
|
|
hnode) {
|
|
if (del_timer(&exp->timeout)) {
|
|
nf_ct_unlink_expect_report(exp,
|
|
NETLINK_CB(skb).portid,
|
|
nlmsg_report(nlh));
|
|
nf_ct_expect_put(exp);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_bh(&nf_conntrack_expect_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
static int
|
|
ctnetlink_change_expect(struct nf_conntrack_expect *x,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
if (cda[CTA_EXPECT_TIMEOUT]) {
|
|
if (!del_timer(&x->timeout))
|
|
return -ETIME;
|
|
|
|
x->timeout.expires = jiffies +
|
|
ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
|
|
add_timer(&x->timeout);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
|
|
[CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
|
|
[CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int
|
|
ctnetlink_parse_expect_nat(const struct nlattr *attr,
|
|
struct nf_conntrack_expect *exp,
|
|
u_int8_t u3)
|
|
{
|
|
#ifdef CONFIG_NF_NAT_NEEDED
|
|
struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
|
|
struct nf_conntrack_tuple nat_tuple = {};
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
|
|
return -EINVAL;
|
|
|
|
err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
|
|
&nat_tuple, CTA_EXPECT_NAT_TUPLE,
|
|
u3, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
exp->saved_addr = nat_tuple.src.u3;
|
|
exp->saved_proto = nat_tuple.src.u;
|
|
exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
|
|
|
|
return 0;
|
|
#else
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
}
|
|
|
|
static struct nf_conntrack_expect *
|
|
ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
|
|
struct nf_conntrack_helper *helper,
|
|
struct nf_conntrack_tuple *tuple,
|
|
struct nf_conntrack_tuple *mask)
|
|
{
|
|
u_int32_t class = 0;
|
|
struct nf_conntrack_expect *exp;
|
|
struct nf_conn_help *help;
|
|
int err;
|
|
|
|
if (cda[CTA_EXPECT_CLASS] && helper) {
|
|
class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
|
|
if (class > helper->expect_class_max)
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
exp = nf_ct_expect_alloc(ct);
|
|
if (!exp)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
help = nfct_help(ct);
|
|
if (!help) {
|
|
if (!cda[CTA_EXPECT_TIMEOUT]) {
|
|
err = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
exp->timeout.expires =
|
|
jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
|
|
|
|
exp->flags = NF_CT_EXPECT_USERSPACE;
|
|
if (cda[CTA_EXPECT_FLAGS]) {
|
|
exp->flags |=
|
|
ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
|
|
}
|
|
} else {
|
|
if (cda[CTA_EXPECT_FLAGS]) {
|
|
exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
|
|
exp->flags &= ~NF_CT_EXPECT_USERSPACE;
|
|
} else
|
|
exp->flags = 0;
|
|
}
|
|
if (cda[CTA_EXPECT_FN]) {
|
|
const char *name = nla_data(cda[CTA_EXPECT_FN]);
|
|
struct nf_ct_helper_expectfn *expfn;
|
|
|
|
expfn = nf_ct_helper_expectfn_find_by_name(name);
|
|
if (expfn == NULL) {
|
|
err = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
exp->expectfn = expfn->expectfn;
|
|
} else
|
|
exp->expectfn = NULL;
|
|
|
|
exp->class = class;
|
|
exp->master = ct;
|
|
exp->helper = helper;
|
|
exp->tuple = *tuple;
|
|
exp->mask.src.u3 = mask->src.u3;
|
|
exp->mask.src.u.all = mask->src.u.all;
|
|
|
|
if (cda[CTA_EXPECT_NAT]) {
|
|
err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
|
|
exp, nf_ct_l3num(ct));
|
|
if (err < 0)
|
|
goto err_out;
|
|
}
|
|
return exp;
|
|
err_out:
|
|
nf_ct_expect_put(exp);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int
|
|
ctnetlink_create_expect(struct net *net,
|
|
const struct nf_conntrack_zone *zone,
|
|
const struct nlattr * const cda[],
|
|
u_int8_t u3, u32 portid, int report)
|
|
{
|
|
struct nf_conntrack_tuple tuple, mask, master_tuple;
|
|
struct nf_conntrack_tuple_hash *h = NULL;
|
|
struct nf_conntrack_helper *helper = NULL;
|
|
struct nf_conntrack_expect *exp;
|
|
struct nf_conn *ct;
|
|
int err;
|
|
|
|
/* caller guarantees that those three CTA_EXPECT_* exist */
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
|
|
u3, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
|
|
u3, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
|
|
u3, NULL);
|
|
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);
|
|
|
|
if (cda[CTA_EXPECT_HELP_NAME]) {
|
|
const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
|
|
|
|
helper = __nf_conntrack_helper_find(helpname, u3,
|
|
nf_ct_protonum(ct));
|
|
if (helper == NULL) {
|
|
#ifdef CONFIG_MODULES
|
|
if (request_module("nfct-helper-%s", helpname) < 0) {
|
|
err = -EOPNOTSUPP;
|
|
goto err_ct;
|
|
}
|
|
helper = __nf_conntrack_helper_find(helpname, u3,
|
|
nf_ct_protonum(ct));
|
|
if (helper) {
|
|
err = -EAGAIN;
|
|
goto err_ct;
|
|
}
|
|
#endif
|
|
err = -EOPNOTSUPP;
|
|
goto err_ct;
|
|
}
|
|
}
|
|
|
|
exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
|
|
if (IS_ERR(exp)) {
|
|
err = PTR_ERR(exp);
|
|
goto err_ct;
|
|
}
|
|
|
|
err = nf_ct_expect_related_report(exp, portid, report);
|
|
nf_ct_expect_put(exp);
|
|
err_ct:
|
|
nf_ct_put(ct);
|
|
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;
|
|
struct nf_conntrack_zone 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, NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
spin_lock_bh(&nf_conntrack_expect_lock);
|
|
exp = __nf_ct_expect_find(net, &zone, &tuple);
|
|
if (!exp) {
|
|
spin_unlock_bh(&nf_conntrack_expect_lock);
|
|
err = -ENOENT;
|
|
if (nlh->nlmsg_flags & NLM_F_CREATE) {
|
|
err = ctnetlink_create_expect(net, &zone, cda, u3,
|
|
NETLINK_CB(skb).portid,
|
|
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_expect_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
|
|
const struct ip_conntrack_stat *st)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
|
|
|
|
event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
|
|
if (nlh == NULL)
|
|
goto nlmsg_failure;
|
|
|
|
nfmsg = nlmsg_data(nlh);
|
|
nfmsg->nfgen_family = AF_UNSPEC;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = htons(cpu);
|
|
|
|
if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
|
|
nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
|
|
nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
|
|
goto nla_put_failure;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nlmsg_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int cpu;
|
|
struct net *net = sock_net(skb->sk);
|
|
|
|
if (cb->args[0] == nr_cpu_ids)
|
|
return 0;
|
|
|
|
for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
|
|
const struct ip_conntrack_stat *st;
|
|
|
|
if (!cpu_possible(cpu))
|
|
continue;
|
|
|
|
st = per_cpu_ptr(net->ct.stat, cpu);
|
|
if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
cpu, st) < 0)
|
|
break;
|
|
}
|
|
cb->args[0] = cpu;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct nlattr * const cda[])
|
|
{
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
struct netlink_dump_control c = {
|
|
.dump = ctnetlink_exp_stat_cpu_dump,
|
|
};
|
|
return netlink_dump_start(ctnl, skb, nlh, &c);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#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 },
|
|
[IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
|
|
[IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
|
|
[IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
|
|
[IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
|
|
};
|
|
|
|
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 },
|
|
[IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
|
|
};
|
|
|
|
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 __net_init ctnetlink_net_init(struct net *net)
|
|
{
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
int ret;
|
|
|
|
ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
|
|
if (ret < 0) {
|
|
pr_err("ctnetlink_init: cannot register notifier.\n");
|
|
goto err_out;
|
|
}
|
|
|
|
ret = nf_ct_expect_register_notifier(net, &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(net, &ctnl_notifier);
|
|
err_out:
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
static void ctnetlink_net_exit(struct net *net)
|
|
{
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
|
|
nf_conntrack_unregister_notifier(net, &ctnl_notifier);
|
|
#endif
|
|
}
|
|
|
|
static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
|
|
{
|
|
struct net *net;
|
|
|
|
list_for_each_entry(net, net_exit_list, exit_list)
|
|
ctnetlink_net_exit(net);
|
|
}
|
|
|
|
static struct pernet_operations ctnetlink_net_ops = {
|
|
.init = ctnetlink_net_init,
|
|
.exit_batch = ctnetlink_net_exit_batch,
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
ret = register_pernet_subsys(&ctnetlink_net_ops);
|
|
if (ret < 0) {
|
|
pr_err("ctnetlink_init: cannot register pernet operations\n");
|
|
goto err_unreg_exp_subsys;
|
|
}
|
|
#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
|
|
/* setup interaction between nf_queue and nf_conntrack_netlink. */
|
|
RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
|
|
#endif
|
|
return 0;
|
|
|
|
err_unreg_exp_subsys:
|
|
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
|
|
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");
|
|
|
|
unregister_pernet_subsys(&ctnetlink_net_ops);
|
|
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
|
|
nfnetlink_subsys_unregister(&ctnl_subsys);
|
|
#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
|
|
RCU_INIT_POINTER(nfq_ct_hook, NULL);
|
|
#endif
|
|
}
|
|
|
|
module_init(ctnetlink_init);
|
|
module_exit(ctnetlink_exit);
|