CC net/netfilter/nf_conntrack_proto_sctp.o net/netfilter/nf_conntrack_proto_sctp.c: In function `sctp_print_conntrack': net/netfilter/nf_conntrack_proto_sctp.c:206: warning: implicit declaration of function `local_bh_disable' net/netfilter/nf_conntrack_proto_sctp.c:208: warning: implicit declaration of function `local_bh_enable' CC net/netfilter/nf_conntrack_netlink.o net/netfilter/nf_conntrack_netlink.c: In function `ctnetlink_dump_table': net/netfilter/nf_conntrack_netlink.c:429: warning: implicit declaration of function `local_bh_disable' net/netfilter/nf_conntrack_netlink.c:452: warning: implicit declaration of function `local_bh_enable' Spotted by Toralf Förster Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
1708 lines
40 KiB
C
1708 lines
40 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) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net>
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*
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* I've reworked this stuff to use attributes instead of conntrack
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* structures. 5.44 am. I need more tea. --pablo 05/07/11.
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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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* Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14)
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/timer.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/netlink.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/notifier.h>
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#include <linux/netfilter.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_l3proto.h>
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#include <net/netfilter/nf_conntrack_protocol.h>
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#include <linux/netfilter_ipv4/ip_nat_protocol.h>
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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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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(format, args...)
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#endif
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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_protocol *proto)
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{
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int ret = 0;
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struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
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NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
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if (likely(proto->tuple_to_nfattr))
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ret = proto->tuple_to_nfattr(skb, tuple);
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NFA_NEST_END(skb, nest_parms);
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return ret;
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nfattr_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 nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
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if (likely(l3proto->tuple_to_nfattr))
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ret = l3proto->tuple_to_nfattr(skb, tuple);
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NFA_NEST_END(skb, nest_parms);
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return ret;
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nfattr_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(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_protocol *proto;
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l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
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ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
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nf_ct_l3proto_put(l3proto);
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if (unlikely(ret < 0))
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return ret;
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proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
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ret = ctnetlink_dump_tuples_proto(skb, tuple, proto);
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nf_ct_proto_put(proto);
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return ret;
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}
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static inline int
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ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
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{
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u_int32_t status = htonl((u_int32_t) ct->status);
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NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
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return 0;
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nfattr_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_l = ct->timeout.expires - jiffies;
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u_int32_t timeout;
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if (timeout_l < 0)
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timeout = 0;
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else
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timeout = htonl(timeout_l / HZ);
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NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
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return 0;
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nfattr_failure:
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return -1;
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}
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static inline int
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ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
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{
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struct nf_conntrack_protocol *proto = nf_ct_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
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struct nfattr *nest_proto;
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int ret;
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if (!proto->to_nfattr) {
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nf_ct_proto_put(proto);
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return 0;
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}
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nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
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ret = proto->to_nfattr(skb, nest_proto, ct);
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nf_ct_proto_put(proto);
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NFA_NEST_END(skb, nest_proto);
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return ret;
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nfattr_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 nfattr *nest_helper;
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const struct nf_conn_help *help = nfct_help(ct);
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if (!help || !help->helper)
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return 0;
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nest_helper = NFA_NEST(skb, CTA_HELP);
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NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name);
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if (help->helper->to_nfattr)
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help->helper->to_nfattr(skb, ct);
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NFA_NEST_END(skb, nest_helper);
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return 0;
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nfattr_failure:
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return -1;
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}
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#ifdef CONFIG_NF_CT_ACCT
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static inline int
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ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
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enum ip_conntrack_dir dir)
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{
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enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
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struct nfattr *nest_count = NFA_NEST(skb, type);
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u_int32_t tmp;
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tmp = htonl(ct->counters[dir].packets);
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NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
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tmp = htonl(ct->counters[dir].bytes);
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NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
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NFA_NEST_END(skb, nest_count);
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return 0;
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nfattr_failure:
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return -1;
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}
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#else
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#define ctnetlink_dump_counters(a, b, c) (0)
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#endif
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#ifdef CONFIG_NF_CONNTRACK_MARK
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static inline int
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ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
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{
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u_int32_t mark = htonl(ct->mark);
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NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
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return 0;
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nfattr_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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static inline int
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ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
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{
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u_int32_t id = htonl(ct->id);
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NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
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return 0;
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nfattr_failure:
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return -1;
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}
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static inline int
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ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
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{
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u_int32_t use = htonl(atomic_read(&ct->ct_general.use));
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NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
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return 0;
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nfattr_failure:
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return -1;
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}
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#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
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static int
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ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
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int event, int nowait,
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const struct nf_conn *ct)
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{
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struct nlmsghdr *nlh;
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struct nfgenmsg *nfmsg;
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struct nfattr *nest_parms;
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unsigned char *b;
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b = skb->tail;
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event |= NFNL_SUBSYS_CTNETLINK << 8;
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nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
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nfmsg = NLMSG_DATA(nlh);
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nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
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nfmsg->nfgen_family =
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ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
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nfmsg->version = NFNETLINK_V0;
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nfmsg->res_id = 0;
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nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
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if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
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goto nfattr_failure;
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NFA_NEST_END(skb, nest_parms);
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nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
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if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
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goto nfattr_failure;
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NFA_NEST_END(skb, nest_parms);
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if (ctnetlink_dump_status(skb, ct) < 0 ||
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ctnetlink_dump_timeout(skb, ct) < 0 ||
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ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
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ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
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ctnetlink_dump_protoinfo(skb, ct) < 0 ||
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ctnetlink_dump_helpinfo(skb, ct) < 0 ||
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ctnetlink_dump_mark(skb, ct) < 0 ||
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ctnetlink_dump_id(skb, ct) < 0 ||
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ctnetlink_dump_use(skb, ct) < 0)
|
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goto nfattr_failure;
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
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return skb->len;
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|
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nlmsg_failure:
|
|
nfattr_failure:
|
|
skb_trim(skb, b - skb->data);
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|
return -1;
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|
}
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|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
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static int ctnetlink_conntrack_event(struct notifier_block *this,
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unsigned long events, void *ptr)
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{
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struct nlmsghdr *nlh;
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struct nfgenmsg *nfmsg;
|
|
struct nfattr *nest_parms;
|
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struct nf_conn *ct = (struct nf_conn *)ptr;
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|
struct sk_buff *skb;
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unsigned int type;
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unsigned char *b;
|
|
unsigned int flags = 0, group;
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|
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/* ignore our fake conntrack entry */
|
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if (ct == &nf_conntrack_untracked)
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return NOTIFY_DONE;
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|
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if (events & IPCT_DESTROY) {
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type = IPCTNL_MSG_CT_DELETE;
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|
group = NFNLGRP_CONNTRACK_DESTROY;
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|
} else if (events & (IPCT_NEW | IPCT_RELATED)) {
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type = IPCTNL_MSG_CT_NEW;
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flags = NLM_F_CREATE|NLM_F_EXCL;
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/* dump everything */
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events = ~0UL;
|
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group = NFNLGRP_CONNTRACK_NEW;
|
|
} else if (events & (IPCT_STATUS |
|
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IPCT_PROTOINFO |
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IPCT_HELPER |
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IPCT_HELPINFO |
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IPCT_NATINFO)) {
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type = IPCTNL_MSG_CT_NEW;
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group = NFNLGRP_CONNTRACK_UPDATE;
|
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} else
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return NOTIFY_DONE;
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|
|
if (!nfnetlink_has_listeners(group))
|
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return NOTIFY_DONE;
|
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|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return NOTIFY_DONE;
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|
|
b = skb->tail;
|
|
|
|
type |= NFNL_SUBSYS_CTNETLINK << 8;
|
|
nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
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nfmsg = NLMSG_DATA(nlh);
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|
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nlh->nlmsg_flags = flags;
|
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nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
|
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nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
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|
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nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
|
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if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
|
|
goto nfattr_failure;
|
|
NFA_NEST_END(skb, nest_parms);
|
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|
|
nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
|
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if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
|
|
goto nfattr_failure;
|
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NFA_NEST_END(skb, nest_parms);
|
|
|
|
/* NAT stuff is now a status flag */
|
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if ((events & IPCT_STATUS || events & IPCT_NATINFO)
|
|
&& ctnetlink_dump_status(skb, ct) < 0)
|
|
goto nfattr_failure;
|
|
if (events & IPCT_REFRESH
|
|
&& ctnetlink_dump_timeout(skb, ct) < 0)
|
|
goto nfattr_failure;
|
|
if (events & IPCT_PROTOINFO
|
|
&& ctnetlink_dump_protoinfo(skb, ct) < 0)
|
|
goto nfattr_failure;
|
|
if (events & IPCT_HELPINFO
|
|
&& ctnetlink_dump_helpinfo(skb, ct) < 0)
|
|
goto nfattr_failure;
|
|
|
|
if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
|
|
ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
|
|
goto nfattr_failure;
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
nfnetlink_send(skb, 0, group, 0);
|
|
return NOTIFY_DONE;
|
|
|
|
nlmsg_failure:
|
|
nfattr_failure:
|
|
kfree_skb(skb);
|
|
return NOTIFY_DONE;
|
|
}
|
|
#endif /* CONFIG_NF_CONNTRACK_EVENTS */
|
|
|
|
static int ctnetlink_done(struct netlink_callback *cb)
|
|
{
|
|
if (cb->args[1])
|
|
nf_ct_put((struct nf_conn *)cb->args[1]);
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
return 0;
|
|
}
|
|
|
|
#define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
|
|
|
|
static int
|
|
ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nf_conn *ct, *last;
|
|
struct nf_conntrack_tuple_hash *h;
|
|
struct list_head *i;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
|
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
|
|
DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__,
|
|
cb->args[0], *id);
|
|
|
|
read_lock_bh(&nf_conntrack_lock);
|
|
for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
|
|
restart:
|
|
last = (struct nf_conn *)cb->args[1];
|
|
list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
|
|
h = (struct nf_conntrack_tuple_hash *) i;
|
|
if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
|
|
continue;
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
/* Dump entries of a given L3 protocol number.
|
|
* If it is not specified, ie. l3proto == 0,
|
|
* then dump everything. */
|
|
if (l3proto && L3PROTO(ct) != l3proto)
|
|
continue;
|
|
if (last != NULL) {
|
|
if (ct == last) {
|
|
nf_ct_put(last);
|
|
cb->args[1] = 0;
|
|
last = NULL;
|
|
} else
|
|
continue;
|
|
}
|
|
if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
IPCTNL_MSG_CT_NEW,
|
|
1, ct) < 0) {
|
|
nf_conntrack_get(&ct->ct_general);
|
|
cb->args[1] = (unsigned long)ct;
|
|
goto out;
|
|
}
|
|
}
|
|
if (last != NULL) {
|
|
nf_ct_put(last);
|
|
cb->args[1] = 0;
|
|
goto restart;
|
|
}
|
|
}
|
|
out:
|
|
read_unlock_bh(&nf_conntrack_lock);
|
|
|
|
DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CT_ACCT
|
|
static int
|
|
ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nf_conn *ct = NULL;
|
|
struct nf_conntrack_tuple_hash *h;
|
|
struct list_head *i;
|
|
u_int32_t *id = (u_int32_t *) &cb->args[1];
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
|
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
|
|
DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__,
|
|
cb->args[0], *id);
|
|
|
|
write_lock_bh(&nf_conntrack_lock);
|
|
for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++, *id = 0) {
|
|
list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
|
|
h = (struct nf_conntrack_tuple_hash *) i;
|
|
if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
|
|
continue;
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
if (l3proto && L3PROTO(ct) != l3proto)
|
|
continue;
|
|
if (ct->id <= *id)
|
|
continue;
|
|
if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
IPCTNL_MSG_CT_NEW,
|
|
1, ct) < 0)
|
|
goto out;
|
|
*id = ct->id;
|
|
|
|
memset(&ct->counters, 0, sizeof(ct->counters));
|
|
}
|
|
}
|
|
out:
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
|
|
DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
|
|
|
|
return skb->len;
|
|
}
|
|
#endif
|
|
|
|
static inline int
|
|
ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
|
|
{
|
|
struct nfattr *tb[CTA_IP_MAX];
|
|
struct nf_conntrack_l3proto *l3proto;
|
|
int ret = 0;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
nfattr_parse_nested(tb, CTA_IP_MAX, attr);
|
|
|
|
l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
|
|
|
|
if (likely(l3proto->nfattr_to_tuple))
|
|
ret = l3proto->nfattr_to_tuple(tb, tuple);
|
|
|
|
nf_ct_l3proto_put(l3proto);
|
|
|
|
DEBUGP("leaving\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const size_t cta_min_proto[CTA_PROTO_MAX] = {
|
|
[CTA_PROTO_NUM-1] = sizeof(u_int8_t),
|
|
};
|
|
|
|
static inline int
|
|
ctnetlink_parse_tuple_proto(struct nfattr *attr,
|
|
struct nf_conntrack_tuple *tuple)
|
|
{
|
|
struct nfattr *tb[CTA_PROTO_MAX];
|
|
struct nf_conntrack_protocol *proto;
|
|
int ret = 0;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
|
|
|
|
if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
|
|
return -EINVAL;
|
|
|
|
if (!tb[CTA_PROTO_NUM-1])
|
|
return -EINVAL;
|
|
tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
|
|
|
|
proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
|
|
|
|
if (likely(proto->nfattr_to_tuple))
|
|
ret = proto->nfattr_to_tuple(tb, tuple);
|
|
|
|
nf_ct_proto_put(proto);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
|
|
enum ctattr_tuple type, u_int8_t l3num)
|
|
{
|
|
struct nfattr *tb[CTA_TUPLE_MAX];
|
|
int err;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
memset(tuple, 0, sizeof(*tuple));
|
|
|
|
nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
|
|
|
|
if (!tb[CTA_TUPLE_IP-1])
|
|
return -EINVAL;
|
|
|
|
tuple->src.l3num = l3num;
|
|
|
|
err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[CTA_TUPLE_PROTO-1])
|
|
return -EINVAL;
|
|
|
|
err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* orig and expect tuples get DIR_ORIGINAL */
|
|
if (type == CTA_TUPLE_REPLY)
|
|
tuple->dst.dir = IP_CT_DIR_REPLY;
|
|
else
|
|
tuple->dst.dir = IP_CT_DIR_ORIGINAL;
|
|
|
|
NF_CT_DUMP_TUPLE(tuple);
|
|
|
|
DEBUGP("leaving\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_NF_NAT_NEEDED
|
|
static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
|
|
[CTA_PROTONAT_PORT_MIN-1] = sizeof(u_int16_t),
|
|
[CTA_PROTONAT_PORT_MAX-1] = sizeof(u_int16_t),
|
|
};
|
|
|
|
static int ctnetlink_parse_nat_proto(struct nfattr *attr,
|
|
const struct nf_conn *ct,
|
|
struct ip_nat_range *range)
|
|
{
|
|
struct nfattr *tb[CTA_PROTONAT_MAX];
|
|
struct ip_nat_protocol *npt;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
|
|
|
|
if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
|
|
return -EINVAL;
|
|
|
|
npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
|
|
|
|
if (!npt->nfattr_to_range) {
|
|
ip_nat_proto_put(npt);
|
|
return 0;
|
|
}
|
|
|
|
/* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
|
|
if (npt->nfattr_to_range(tb, range) > 0)
|
|
range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
|
|
|
|
ip_nat_proto_put(npt);
|
|
|
|
DEBUGP("leaving\n");
|
|
return 0;
|
|
}
|
|
|
|
static const size_t cta_min_nat[CTA_NAT_MAX] = {
|
|
[CTA_NAT_MINIP-1] = sizeof(u_int32_t),
|
|
[CTA_NAT_MAXIP-1] = sizeof(u_int32_t),
|
|
};
|
|
|
|
static inline int
|
|
ctnetlink_parse_nat(struct nfattr *nat,
|
|
const struct nf_conn *ct, struct ip_nat_range *range)
|
|
{
|
|
struct nfattr *tb[CTA_NAT_MAX];
|
|
int err;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
memset(range, 0, sizeof(*range));
|
|
|
|
nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
|
|
|
|
if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
|
|
return -EINVAL;
|
|
|
|
if (tb[CTA_NAT_MINIP-1])
|
|
range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
|
|
|
|
if (!tb[CTA_NAT_MAXIP-1])
|
|
range->max_ip = range->min_ip;
|
|
else
|
|
range->max_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
|
|
|
|
if (range->min_ip)
|
|
range->flags |= IP_NAT_RANGE_MAP_IPS;
|
|
|
|
if (!tb[CTA_NAT_PROTO-1])
|
|
return 0;
|
|
|
|
err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
DEBUGP("leaving\n");
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static inline int
|
|
ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
|
|
{
|
|
struct nfattr *tb[CTA_HELP_MAX];
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
|
|
|
|
if (!tb[CTA_HELP_NAME-1])
|
|
return -EINVAL;
|
|
|
|
*helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const size_t cta_min[CTA_MAX] = {
|
|
[CTA_STATUS-1] = sizeof(u_int32_t),
|
|
[CTA_TIMEOUT-1] = sizeof(u_int32_t),
|
|
[CTA_MARK-1] = sizeof(u_int32_t),
|
|
[CTA_USE-1] = sizeof(u_int32_t),
|
|
[CTA_ID-1] = sizeof(u_int32_t)
|
|
};
|
|
|
|
static int
|
|
ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
|
|
{
|
|
struct nf_conntrack_tuple_hash *h;
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conn *ct;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
int err = 0;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
if (nfattr_bad_size(cda, CTA_MAX, cta_min))
|
|
return -EINVAL;
|
|
|
|
if (cda[CTA_TUPLE_ORIG-1])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
|
|
else if (cda[CTA_TUPLE_REPLY-1])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
|
|
else {
|
|
/* Flush the whole table */
|
|
nf_conntrack_flush();
|
|
return 0;
|
|
}
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
h = nf_conntrack_find_get(&tuple, NULL);
|
|
if (!h) {
|
|
DEBUGP("tuple not found in conntrack hash\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
|
|
if (cda[CTA_ID-1]) {
|
|
u_int32_t id = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_ID-1]));
|
|
if (ct->id != id) {
|
|
nf_ct_put(ct);
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
if (del_timer(&ct->timeout))
|
|
ct->timeout.function((unsigned long)ct);
|
|
|
|
nf_ct_put(ct);
|
|
DEBUGP("leaving\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
|
|
{
|
|
struct nf_conntrack_tuple_hash *h;
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conn *ct;
|
|
struct sk_buff *skb2 = NULL;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
int err = 0;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
u32 rlen;
|
|
|
|
if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
|
|
IPCTNL_MSG_CT_GET_CTRZERO) {
|
|
#ifdef CONFIG_NF_CT_ACCT
|
|
if ((*errp = netlink_dump_start(ctnl, skb, nlh,
|
|
ctnetlink_dump_table_w,
|
|
ctnetlink_done)) != 0)
|
|
return -EINVAL;
|
|
#else
|
|
return -ENOTSUPP;
|
|
#endif
|
|
} else {
|
|
if ((*errp = netlink_dump_start(ctnl, skb, nlh,
|
|
ctnetlink_dump_table,
|
|
ctnetlink_done)) != 0)
|
|
return -EINVAL;
|
|
}
|
|
|
|
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
|
|
if (rlen > skb->len)
|
|
rlen = skb->len;
|
|
skb_pull(skb, rlen);
|
|
return 0;
|
|
}
|
|
|
|
if (nfattr_bad_size(cda, CTA_MAX, cta_min))
|
|
return -EINVAL;
|
|
|
|
if (cda[CTA_TUPLE_ORIG-1])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
|
|
else if (cda[CTA_TUPLE_REPLY-1])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
|
|
else
|
|
return -EINVAL;
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
h = nf_conntrack_find_get(&tuple, NULL);
|
|
if (!h) {
|
|
DEBUGP("tuple not found in conntrack hash");
|
|
return -ENOENT;
|
|
}
|
|
DEBUGP("tuple found\n");
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
|
|
err = -ENOMEM;
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb2) {
|
|
nf_ct_put(ct);
|
|
return -ENOMEM;
|
|
}
|
|
NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
|
|
|
|
err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
|
|
IPCTNL_MSG_CT_NEW, 1, ct);
|
|
nf_ct_put(ct);
|
|
if (err <= 0)
|
|
goto free;
|
|
|
|
err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
DEBUGP("leaving\n");
|
|
return 0;
|
|
|
|
free:
|
|
kfree_skb(skb2);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
|
|
{
|
|
unsigned long d;
|
|
unsigned status = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_STATUS-1]));
|
|
d = ct->status ^ status;
|
|
|
|
if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
|
|
/* unchangeable */
|
|
return -EINVAL;
|
|
|
|
if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
|
|
/* SEEN_REPLY bit can only be set */
|
|
return -EINVAL;
|
|
|
|
|
|
if (d & IPS_ASSURED && !(status & IPS_ASSURED))
|
|
/* ASSURED bit can only be set */
|
|
return -EINVAL;
|
|
|
|
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
|
|
#ifndef CONFIG_IP_NF_NAT_NEEDED
|
|
return -EINVAL;
|
|
#else
|
|
struct ip_nat_range range;
|
|
|
|
if (cda[CTA_NAT_DST-1]) {
|
|
if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
|
|
&range) < 0)
|
|
return -EINVAL;
|
|
if (ip_nat_initialized(ct,
|
|
HOOK2MANIP(NF_IP_PRE_ROUTING)))
|
|
return -EEXIST;
|
|
ip_nat_setup_info(ct, &range, hooknum);
|
|
}
|
|
if (cda[CTA_NAT_SRC-1]) {
|
|
if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
|
|
&range) < 0)
|
|
return -EINVAL;
|
|
if (ip_nat_initialized(ct,
|
|
HOOK2MANIP(NF_IP_POST_ROUTING)))
|
|
return -EEXIST;
|
|
ip_nat_setup_info(ct, &range, hooknum);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Be careful here, modifying NAT bits can screw up things,
|
|
* so don't let users modify them directly if they don't pass
|
|
* ip_nat_range. */
|
|
ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static inline int
|
|
ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
|
|
{
|
|
struct nf_conntrack_helper *helper;
|
|
struct nf_conn_help *help = nfct_help(ct);
|
|
char *helpname;
|
|
int err;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
if (!help) {
|
|
/* FIXME: we need to reallocate and rehash */
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* don't change helper of sibling connections */
|
|
if (ct->master)
|
|
return -EINVAL;
|
|
|
|
err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
helper = __nf_conntrack_helper_find_byname(helpname);
|
|
if (!helper) {
|
|
if (!strcmp(helpname, ""))
|
|
helper = NULL;
|
|
else
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (help->helper) {
|
|
if (!helper) {
|
|
/* we had a helper before ... */
|
|
nf_ct_remove_expectations(ct);
|
|
help->helper = NULL;
|
|
} else {
|
|
/* need to zero data of old helper */
|
|
memset(&help->help, 0, sizeof(help->help));
|
|
}
|
|
}
|
|
|
|
help->helper = helper;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
|
|
{
|
|
u_int32_t timeout = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
|
|
|
|
if (!del_timer(&ct->timeout))
|
|
return -ETIME;
|
|
|
|
ct->timeout.expires = jiffies + timeout * HZ;
|
|
add_timer(&ct->timeout);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
|
|
{
|
|
struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
|
|
struct nf_conntrack_protocol *proto;
|
|
u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
|
|
u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
|
|
int err = 0;
|
|
|
|
nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
|
|
|
|
proto = nf_ct_proto_find_get(l3num, npt);
|
|
|
|
if (proto->from_nfattr)
|
|
err = proto->from_nfattr(tb, ct);
|
|
nf_ct_proto_put(proto);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
|
|
{
|
|
int err;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
if (cda[CTA_HELP-1]) {
|
|
err = ctnetlink_change_helper(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_TIMEOUT-1]) {
|
|
err = ctnetlink_change_timeout(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_STATUS-1]) {
|
|
err = ctnetlink_change_status(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_PROTOINFO-1]) {
|
|
err = ctnetlink_change_protoinfo(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
#if defined(CONFIG_NF_CONNTRACK_MARK)
|
|
if (cda[CTA_MARK-1])
|
|
ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
|
|
#endif
|
|
|
|
DEBUGP("all done\n");
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_create_conntrack(struct nfattr *cda[],
|
|
struct nf_conntrack_tuple *otuple,
|
|
struct nf_conntrack_tuple *rtuple)
|
|
{
|
|
struct nf_conn *ct;
|
|
int err = -EINVAL;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
ct = nf_conntrack_alloc(otuple, rtuple);
|
|
if (ct == NULL || IS_ERR(ct))
|
|
return -ENOMEM;
|
|
|
|
if (!cda[CTA_TIMEOUT-1])
|
|
goto err;
|
|
ct->timeout.expires = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_TIMEOUT-1]));
|
|
|
|
ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
|
|
ct->status |= IPS_CONFIRMED;
|
|
|
|
err = ctnetlink_change_status(ct, cda);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
if (cda[CTA_PROTOINFO-1]) {
|
|
err = ctnetlink_change_protoinfo(ct, cda);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
#if defined(CONFIG_NF_CONNTRACK_MARK)
|
|
if (cda[CTA_MARK-1])
|
|
ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1]));
|
|
#endif
|
|
|
|
add_timer(&ct->timeout);
|
|
nf_conntrack_hash_insert(ct);
|
|
|
|
DEBUGP("conntrack with id %u inserted\n", ct->id);
|
|
return 0;
|
|
|
|
err:
|
|
nf_conntrack_free(ct);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
|
|
{
|
|
struct nf_conntrack_tuple otuple, rtuple;
|
|
struct nf_conntrack_tuple_hash *h = NULL;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
int err = 0;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
if (nfattr_bad_size(cda, CTA_MAX, cta_min))
|
|
return -EINVAL;
|
|
|
|
if (cda[CTA_TUPLE_ORIG-1]) {
|
|
err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (cda[CTA_TUPLE_REPLY-1]) {
|
|
err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
write_lock_bh(&nf_conntrack_lock);
|
|
if (cda[CTA_TUPLE_ORIG-1])
|
|
h = __nf_conntrack_find(&otuple, NULL);
|
|
else if (cda[CTA_TUPLE_REPLY-1])
|
|
h = __nf_conntrack_find(&rtuple, NULL);
|
|
|
|
if (h == NULL) {
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
DEBUGP("no such conntrack, create new\n");
|
|
err = -ENOENT;
|
|
if (nlh->nlmsg_flags & NLM_F_CREATE)
|
|
err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
|
|
return err;
|
|
}
|
|
/* implicit 'else' */
|
|
|
|
/* we only allow nat config for new conntracks */
|
|
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
|
|
err = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* We manipulate the conntrack inside the global conntrack table lock,
|
|
* so there's no need to increase the refcount */
|
|
DEBUGP("conntrack found\n");
|
|
err = -EEXIST;
|
|
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
|
|
err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
|
|
|
|
out_unlock:
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
return err;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* EXPECT
|
|
***********************************************************************/
|
|
|
|
static inline int
|
|
ctnetlink_exp_dump_tuple(struct sk_buff *skb,
|
|
const struct nf_conntrack_tuple *tuple,
|
|
enum ctattr_expect type)
|
|
{
|
|
struct nfattr *nest_parms = NFA_NEST(skb, type);
|
|
|
|
if (ctnetlink_dump_tuples(skb, tuple) < 0)
|
|
goto nfattr_failure;
|
|
|
|
NFA_NEST_END(skb, nest_parms);
|
|
|
|
return 0;
|
|
|
|
nfattr_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)
|
|
{
|
|
int ret;
|
|
struct nf_conntrack_l3proto *l3proto;
|
|
struct nf_conntrack_protocol *proto;
|
|
struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
|
|
|
|
l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
|
|
ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
|
|
nf_ct_l3proto_put(l3proto);
|
|
|
|
if (unlikely(ret < 0))
|
|
goto nfattr_failure;
|
|
|
|
proto = nf_ct_proto_find_get(tuple->src.l3num, tuple->dst.protonum);
|
|
ret = ctnetlink_dump_tuples_proto(skb, mask, proto);
|
|
nf_ct_proto_put(proto);
|
|
if (unlikely(ret < 0))
|
|
goto nfattr_failure;
|
|
|
|
NFA_NEST_END(skb, nest_parms);
|
|
|
|
return 0;
|
|
|
|
nfattr_failure:
|
|
return -1;
|
|
}
|
|
|
|
static inline int
|
|
ctnetlink_exp_dump_expect(struct sk_buff *skb,
|
|
const struct nf_conntrack_expect *exp)
|
|
{
|
|
struct nf_conn *master = exp->master;
|
|
u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
|
|
u_int32_t id = htonl(exp->id);
|
|
|
|
if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
|
|
goto nfattr_failure;
|
|
if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
|
|
goto nfattr_failure;
|
|
if (ctnetlink_exp_dump_tuple(skb,
|
|
&master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
|
|
CTA_EXPECT_MASTER) < 0)
|
|
goto nfattr_failure;
|
|
|
|
NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
|
|
NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
|
|
|
|
return 0;
|
|
|
|
nfattr_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
|
|
int event,
|
|
int nowait,
|
|
const struct nf_conntrack_expect *exp)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
unsigned char *b;
|
|
|
|
b = skb->tail;
|
|
|
|
event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
|
|
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
|
|
nfmsg = NLMSG_DATA(nlh);
|
|
|
|
nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
|
|
nfmsg->nfgen_family = exp->tuple.src.l3num;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
|
|
goto nfattr_failure;
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
nfattr_failure:
|
|
skb_trim(skb, b - skb->data);
|
|
return -1;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
static int ctnetlink_expect_event(struct notifier_block *this,
|
|
unsigned long events, void *ptr)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct nfgenmsg *nfmsg;
|
|
struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
|
|
struct sk_buff *skb;
|
|
unsigned int type;
|
|
unsigned char *b;
|
|
int flags = 0;
|
|
|
|
if (events & IPEXP_NEW) {
|
|
type = IPCTNL_MSG_EXP_NEW;
|
|
flags = NLM_F_CREATE|NLM_F_EXCL;
|
|
} else
|
|
return NOTIFY_DONE;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return NOTIFY_DONE;
|
|
|
|
b = skb->tail;
|
|
|
|
type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
|
|
nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
|
|
nfmsg = NLMSG_DATA(nlh);
|
|
|
|
nlh->nlmsg_flags = flags;
|
|
nfmsg->nfgen_family = exp->tuple.src.l3num;
|
|
nfmsg->version = NFNETLINK_V0;
|
|
nfmsg->res_id = 0;
|
|
|
|
if (ctnetlink_exp_dump_expect(skb, exp) < 0)
|
|
goto nfattr_failure;
|
|
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
|
|
return NOTIFY_DONE;
|
|
|
|
nlmsg_failure:
|
|
nfattr_failure:
|
|
kfree_skb(skb);
|
|
return NOTIFY_DONE;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nf_conntrack_expect *exp = NULL;
|
|
struct list_head *i;
|
|
u_int32_t *id = (u_int32_t *) &cb->args[0];
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
|
|
u_int8_t l3proto = nfmsg->nfgen_family;
|
|
|
|
DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
|
|
|
|
read_lock_bh(&nf_conntrack_lock);
|
|
list_for_each_prev(i, &nf_conntrack_expect_list) {
|
|
exp = (struct nf_conntrack_expect *) i;
|
|
if (l3proto && exp->tuple.src.l3num != l3proto)
|
|
continue;
|
|
if (exp->id <= *id)
|
|
continue;
|
|
if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq,
|
|
IPCTNL_MSG_EXP_NEW,
|
|
1, exp) < 0)
|
|
goto out;
|
|
*id = exp->id;
|
|
}
|
|
out:
|
|
read_unlock_bh(&nf_conntrack_lock);
|
|
|
|
DEBUGP("leaving, last id=%llu\n", *id);
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
|
|
[CTA_EXPECT_TIMEOUT-1] = sizeof(u_int32_t),
|
|
[CTA_EXPECT_ID-1] = sizeof(u_int32_t)
|
|
};
|
|
|
|
static int
|
|
ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
|
|
{
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conntrack_expect *exp;
|
|
struct sk_buff *skb2;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
int err = 0;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
|
|
return -EINVAL;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
u32 rlen;
|
|
|
|
if ((*errp = netlink_dump_start(ctnl, skb, nlh,
|
|
ctnetlink_exp_dump_table,
|
|
ctnetlink_done)) != 0)
|
|
return -EINVAL;
|
|
rlen = NLMSG_ALIGN(nlh->nlmsg_len);
|
|
if (rlen > skb->len)
|
|
rlen = skb->len;
|
|
skb_pull(skb, rlen);
|
|
return 0;
|
|
}
|
|
|
|
if (cda[CTA_EXPECT_MASTER-1])
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
|
|
else
|
|
return -EINVAL;
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
exp = nf_conntrack_expect_find(&tuple);
|
|
if (!exp)
|
|
return -ENOENT;
|
|
|
|
if (cda[CTA_EXPECT_ID-1]) {
|
|
u_int32_t id = *(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
|
|
if (exp->id != ntohl(id)) {
|
|
nf_conntrack_expect_put(exp);
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb2)
|
|
goto out;
|
|
NETLINK_CB(skb2).dst_pid = NETLINK_CB(skb).pid;
|
|
|
|
err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
|
|
nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
|
|
1, exp);
|
|
if (err <= 0)
|
|
goto free;
|
|
|
|
nf_conntrack_expect_put(exp);
|
|
|
|
return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
|
|
free:
|
|
kfree_skb(skb2);
|
|
out:
|
|
nf_conntrack_expect_put(exp);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
|
|
{
|
|
struct nf_conntrack_expect *exp, *tmp;
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conntrack_helper *h;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
int err;
|
|
|
|
if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
|
|
return -EINVAL;
|
|
|
|
if (cda[CTA_EXPECT_TUPLE-1]) {
|
|
/* delete a single expect by tuple */
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* bump usage count to 2 */
|
|
exp = nf_conntrack_expect_find(&tuple);
|
|
if (!exp)
|
|
return -ENOENT;
|
|
|
|
if (cda[CTA_EXPECT_ID-1]) {
|
|
u_int32_t id =
|
|
*(u_int32_t *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
|
|
if (exp->id != ntohl(id)) {
|
|
nf_conntrack_expect_put(exp);
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
/* after list removal, usage count == 1 */
|
|
nf_conntrack_unexpect_related(exp);
|
|
/* have to put what we 'get' above.
|
|
* after this line usage count == 0 */
|
|
nf_conntrack_expect_put(exp);
|
|
} else if (cda[CTA_EXPECT_HELP_NAME-1]) {
|
|
char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
|
|
|
|
/* delete all expectations for this helper */
|
|
write_lock_bh(&nf_conntrack_lock);
|
|
h = __nf_conntrack_helper_find_byname(name);
|
|
if (!h) {
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
return -EINVAL;
|
|
}
|
|
list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
|
|
list) {
|
|
struct nf_conn_help *m_help = nfct_help(exp->master);
|
|
if (m_help->helper == h
|
|
&& del_timer(&exp->timeout)) {
|
|
nf_ct_unlink_expect(exp);
|
|
nf_conntrack_expect_put(exp);
|
|
}
|
|
}
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
} else {
|
|
/* This basically means we have to flush everything*/
|
|
write_lock_bh(&nf_conntrack_lock);
|
|
list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
|
|
list) {
|
|
if (del_timer(&exp->timeout)) {
|
|
nf_ct_unlink_expect(exp);
|
|
nf_conntrack_expect_put(exp);
|
|
}
|
|
}
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
static int
|
|
ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
|
|
{
|
|
struct nf_conntrack_tuple tuple, mask, master_tuple;
|
|
struct nf_conntrack_tuple_hash *h = NULL;
|
|
struct nf_conntrack_expect *exp;
|
|
struct nf_conn *ct;
|
|
struct nf_conn_help *help;
|
|
int err = 0;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
/* caller guarantees that those three CTA_EXPECT_* exist */
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
|
|
if (err < 0)
|
|
return err;
|
|
err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
|
|
if (err < 0)
|
|
return err;
|
|
err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* Look for master conntrack of this expectation */
|
|
h = nf_conntrack_find_get(&master_tuple, NULL);
|
|
if (!h)
|
|
return -ENOENT;
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
help = nfct_help(ct);
|
|
|
|
if (!help || !help->helper) {
|
|
/* such conntrack hasn't got any helper, abort */
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
exp = nf_conntrack_expect_alloc(ct);
|
|
if (!exp) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
exp->expectfn = NULL;
|
|
exp->flags = 0;
|
|
exp->master = ct;
|
|
memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
|
|
memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
|
|
|
|
err = nf_conntrack_expect_related(exp);
|
|
nf_conntrack_expect_put(exp);
|
|
|
|
out:
|
|
nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
|
|
struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
|
|
{
|
|
struct nf_conntrack_tuple tuple;
|
|
struct nf_conntrack_expect *exp;
|
|
struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
|
|
u_int8_t u3 = nfmsg->nfgen_family;
|
|
int err = 0;
|
|
|
|
DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
|
if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
|
|
return -EINVAL;
|
|
|
|
if (!cda[CTA_EXPECT_TUPLE-1]
|
|
|| !cda[CTA_EXPECT_MASK-1]
|
|
|| !cda[CTA_EXPECT_MASTER-1])
|
|
return -EINVAL;
|
|
|
|
err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
write_lock_bh(&nf_conntrack_lock);
|
|
exp = __nf_conntrack_expect_find(&tuple);
|
|
|
|
if (!exp) {
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
err = -ENOENT;
|
|
if (nlh->nlmsg_flags & NLM_F_CREATE)
|
|
err = ctnetlink_create_expect(cda, u3);
|
|
return err;
|
|
}
|
|
|
|
err = -EEXIST;
|
|
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
|
|
err = ctnetlink_change_expect(exp, cda);
|
|
write_unlock_bh(&nf_conntrack_lock);
|
|
|
|
DEBUGP("leaving\n");
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
static struct notifier_block ctnl_notifier = {
|
|
.notifier_call = ctnetlink_conntrack_event,
|
|
};
|
|
|
|
static struct notifier_block ctnl_notifier_exp = {
|
|
.notifier_call = ctnetlink_expect_event,
|
|
};
|
|
#endif
|
|
|
|
static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
|
|
[IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
|
|
.attr_count = CTA_MAX, },
|
|
[IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
|
|
.attr_count = CTA_MAX, },
|
|
[IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
|
|
.attr_count = CTA_MAX, },
|
|
[IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
|
|
.attr_count = CTA_MAX, },
|
|
};
|
|
|
|
static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
|
|
[IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
|
|
.attr_count = CTA_EXPECT_MAX, },
|
|
[IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
|
|
.attr_count = CTA_EXPECT_MAX, },
|
|
[IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
|
|
.attr_count = CTA_EXPECT_MAX, },
|
|
};
|
|
|
|
static struct nfnetlink_subsystem ctnl_subsys = {
|
|
.name = "conntrack",
|
|
.subsys_id = NFNL_SUBSYS_CTNETLINK,
|
|
.cb_count = IPCTNL_MSG_MAX,
|
|
.cb = ctnl_cb,
|
|
};
|
|
|
|
static 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_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
|
|
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
|
|
|
|
static int __init ctnetlink_init(void)
|
|
{
|
|
int ret;
|
|
|
|
printk("ctnetlink v%s: registering with nfnetlink.\n", version);
|
|
ret = nfnetlink_subsys_register(&ctnl_subsys);
|
|
if (ret < 0) {
|
|
printk("ctnetlink_init: cannot register with nfnetlink.\n");
|
|
goto err_out;
|
|
}
|
|
|
|
ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
|
|
if (ret < 0) {
|
|
printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
|
|
goto err_unreg_subsys;
|
|
}
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
ret = nf_conntrack_register_notifier(&ctnl_notifier);
|
|
if (ret < 0) {
|
|
printk("ctnetlink_init: cannot register notifier.\n");
|
|
goto err_unreg_exp_subsys;
|
|
}
|
|
|
|
ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
|
|
if (ret < 0) {
|
|
printk("ctnetlink_init: cannot expect register notifier.\n");
|
|
goto err_unreg_notifier;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
err_unreg_notifier:
|
|
nf_conntrack_unregister_notifier(&ctnl_notifier);
|
|
err_unreg_exp_subsys:
|
|
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
|
|
#endif
|
|
err_unreg_subsys:
|
|
nfnetlink_subsys_unregister(&ctnl_subsys);
|
|
err_out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ctnetlink_exit(void)
|
|
{
|
|
printk("ctnetlink: unregistering from nfnetlink.\n");
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_EVENTS
|
|
nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
|
|
nf_conntrack_unregister_notifier(&ctnl_notifier);
|
|
#endif
|
|
|
|
nfnetlink_subsys_unregister(&ctnl_exp_subsys);
|
|
nfnetlink_subsys_unregister(&ctnl_subsys);
|
|
return;
|
|
}
|
|
|
|
module_init(ctnetlink_init);
|
|
module_exit(ctnetlink_exit);
|