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@@ -0,0 +1,1588 @@
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+/* 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) 2002-2005 by Harald Welte <laforge@gnumonks.org>
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+ * (C) 2003 by Patrick Mchardy <kaber@trash.net>
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+ * (C) 2005 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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+
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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/notifier.h>
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+#include <linux/rtnetlink.h>
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+
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+#include <linux/netfilter.h>
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+#include <linux/netfilter_ipv4.h>
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+#include <linux/netfilter_ipv4/ip_tables.h>
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+#include <linux/netfilter_ipv4/ip_conntrack.h>
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+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
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+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
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+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
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+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
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+
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+#include <linux/netfilter/nfnetlink.h>
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+#include <linux/netfilter/nfnetlink_conntrack.h>
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+
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+MODULE_LICENSE("GPL");
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+
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+static char __initdata version[] = "0.90";
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+
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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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+
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+
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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 ip_conntrack_tuple *tuple)
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+{
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+ struct ip_conntrack_protocol *proto;
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+
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+ NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
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+
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+ proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
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+ if (proto && proto->tuple_to_nfattr)
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+ return proto->tuple_to_nfattr(skb, tuple);
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+
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+ return 0;
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+
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+nfattr_failure:
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+ return -1;
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+}
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+
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+static inline int
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+ctnetlink_dump_tuples(struct sk_buff *skb,
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+ const struct ip_conntrack_tuple *tuple)
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+{
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+ struct nfattr *nest_parms;
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+
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+ nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
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+ NFA_PUT(skb, CTA_IP_V4_SRC, sizeof(u_int32_t), &tuple->src.ip);
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+ NFA_PUT(skb, CTA_IP_V4_DST, sizeof(u_int32_t), &tuple->dst.ip);
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+ NFA_NEST_END(skb, nest_parms);
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+
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+ nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
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+ ctnetlink_dump_tuples_proto(skb, tuple);
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+ NFA_NEST_END(skb, nest_parms);
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+
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+ return 0;
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+
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+nfattr_failure:
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+ return -1;
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+}
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+
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+static inline int
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+ctnetlink_dump_status(struct sk_buff *skb, const struct ip_conntrack *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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+
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+nfattr_failure:
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+ return -1;
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+}
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+
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+static inline int
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+ctnetlink_dump_timeout(struct sk_buff *skb, const struct ip_conntrack *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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+
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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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+
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+ NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
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+ return 0;
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+
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+nfattr_failure:
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+ return -1;
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+}
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+
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+static inline int
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+ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
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+{
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+ struct ip_conntrack_protocol *proto = ip_conntrack_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
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+
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+ struct nfattr *nest_proto;
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+ int ret;
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+
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+ if (!proto || !proto->to_nfattr)
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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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+
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+ ret = proto->to_nfattr(skb, nest_proto, ct);
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+
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+ ip_conntrack_proto_put(proto);
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+
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+ NFA_NEST_END(skb, nest_proto);
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+
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+ return ret;
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+
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+nfattr_failure:
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+ return -1;
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+}
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+
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+static inline int
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+ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
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+{
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+ struct nfattr *nest_helper;
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+
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+ if (!ct->helper)
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+ return 0;
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+
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+ nest_helper = NFA_NEST(skb, CTA_HELP);
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+ NFA_PUT(skb, CTA_HELP_NAME, CTA_HELP_MAXNAMESIZE, &ct->helper->name);
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+
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+ if (ct->helper->to_nfattr)
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+ ct->helper->to_nfattr(skb, ct);
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+
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+ NFA_NEST_END(skb, nest_helper);
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+
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+ return 0;
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+
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+nfattr_failure:
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+ return -1;
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+}
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+
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+#ifdef CONFIG_IP_NF_CT_ACCT
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+static inline int
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+ctnetlink_dump_counters(struct sk_buff *skb, const struct ip_conntrack *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_int64_t tmp;
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+
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+ tmp = cpu_to_be64(ct->counters[dir].packets);
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+ NFA_PUT(skb, CTA_COUNTERS_PACKETS, sizeof(u_int64_t), &tmp);
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+
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+ tmp = cpu_to_be64(ct->counters[dir].bytes);
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+ NFA_PUT(skb, CTA_COUNTERS_BYTES, sizeof(u_int64_t), &tmp);
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+
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+ NFA_NEST_END(skb, nest_count);
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+
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+ return 0;
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+
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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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+
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+#ifdef CONFIG_IP_NF_CONNTRACK_MARK
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+static inline int
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+ctnetlink_dump_mark(struct sk_buff *skb, const struct ip_conntrack *ct)
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+{
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+ u_int32_t mark = htonl(ct->mark);
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+
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+ NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
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+ return 0;
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+
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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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+
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+static inline int
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+ctnetlink_dump_id(struct sk_buff *skb, const struct ip_conntrack *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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+
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+nfattr_failure:
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+ return -1;
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+}
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+
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+static inline int
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+ctnetlink_dump_use(struct sk_buff *skb, const struct ip_conntrack *ct)
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+{
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+ unsigned int use = htonl(atomic_read(&ct->ct_general.use));
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+
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+ NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
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+ return 0;
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+
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+nfattr_failure:
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+ return -1;
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+}
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+
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+#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
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+
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+static int
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+ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
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+ int event, int nowait,
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+ const struct ip_conntrack *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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+
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+ b = skb->tail;
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+
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+ event |= NFNL_SUBSYS_CTNETLINK << 8;
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+ nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
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+ nfmsg = NLMSG_DATA(nlh);
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+
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+ nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
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+ nfmsg->nfgen_family = AF_INET;
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+ nfmsg->version = NFNETLINK_V0;
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+ 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)
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+ goto nfattr_failure;
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+ NFA_NEST_END(skb, nest_parms);
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+
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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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+
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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;
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+
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+ nlh->nlmsg_len = skb->tail - b;
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+ return skb->len;
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+
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+nlmsg_failure:
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+nfattr_failure:
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+ skb_trim(skb, b - skb->data);
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+ return -1;
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+}
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+
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+#ifdef CONFIG_IP_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;
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+ struct nfattr *nest_parms;
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+ struct ip_conntrack *ct = (struct ip_conntrack *)ptr;
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+ struct sk_buff *skb;
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+ unsigned int type;
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+ unsigned char *b;
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+ unsigned int flags = 0, groups;
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+
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+ /* ignore our fake conntrack entry */
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+ if (ct == &ip_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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+ groups = NF_NETLINK_CONNTRACK_DESTROY;
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+ goto alloc_skb;
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+ }
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+ 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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+ groups = NF_NETLINK_CONNTRACK_NEW;
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+ goto alloc_skb;
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+ }
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+ 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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+ groups = NF_NETLINK_CONNTRACK_UPDATE;
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+ goto alloc_skb;
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+ }
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+
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+ return NOTIFY_DONE;
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+
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+alloc_skb:
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+ /* FIXME: Check if there are any listeners before, don't hurt performance */
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+
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+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
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+ if (!skb)
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+ return NOTIFY_DONE;
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+
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+ b = skb->tail;
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+
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+ type |= NFNL_SUBSYS_CTNETLINK << 8;
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+ 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 = AF_INET;
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+ nfmsg->version = NFNETLINK_V0;
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+ 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)
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+ goto nfattr_failure;
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+ NFA_NEST_END(skb, nest_parms);
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+
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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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+
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+ /* NAT stuff is now a status flag */
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+ if ((events & IPCT_STATUS || events & IPCT_NATINFO)
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+ && ctnetlink_dump_status(skb, ct) < 0)
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+ goto nfattr_failure;
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+ if (events & IPCT_REFRESH
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+ && ctnetlink_dump_timeout(skb, ct) < 0)
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+ goto nfattr_failure;
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+ if (events & IPCT_PROTOINFO
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+ && ctnetlink_dump_protoinfo(skb, ct) < 0)
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+ goto nfattr_failure;
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+ if (events & IPCT_HELPINFO
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+ && ctnetlink_dump_helpinfo(skb, ct) < 0)
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+ goto nfattr_failure;
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+
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+ if (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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+ goto nfattr_failure;
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+
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+ nlh->nlmsg_len = skb->tail - b;
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+ nfnetlink_send(skb, 0, groups, 0);
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+ return NOTIFY_DONE;
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+
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+nlmsg_failure:
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+nfattr_failure:
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+ kfree_skb(skb);
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+ return NOTIFY_DONE;
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+}
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+#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
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+
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+static int ctnetlink_done(struct netlink_callback *cb)
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+{
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|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
|
|
|
+{
|
|
|
+ struct ip_conntrack *ct = NULL;
|
|
|
+ struct ip_conntrack_tuple_hash *h;
|
|
|
+ struct list_head *i;
|
|
|
+ u_int32_t *id = (u_int32_t *) &cb->args[1];
|
|
|
+
|
|
|
+ DEBUGP("entered %s, last bucket=%lu id=%u\n", __FUNCTION__,
|
|
|
+ cb->args[0], *id);
|
|
|
+
|
|
|
+ read_lock_bh(&ip_conntrack_lock);
|
|
|
+ for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++, *id = 0) {
|
|
|
+ list_for_each(i, &ip_conntrack_hash[cb->args[0]]) {
|
|
|
+ h = (struct ip_conntrack_tuple_hash *) i;
|
|
|
+ if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
|
|
|
+ continue;
|
|
|
+ ct = tuplehash_to_ctrack(h);
|
|
|
+ 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;
|
|
|
+ }
|
|
|
+ }
|
|
|
+out:
|
|
|
+ read_unlock_bh(&ip_conntrack_lock);
|
|
|
+
|
|
|
+ DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
|
|
|
+
|
|
|
+ return skb->len;
|
|
|
+}
|
|
|
+
|
|
|
+#ifdef CONFIG_IP_NF_CT_ACCT
|
|
|
+static int
|
|
|
+ctnetlink_dump_table_w(struct sk_buff *skb, struct netlink_callback *cb)
|
|
|
+{
|
|
|
+ struct ip_conntrack *ct = NULL;
|
|
|
+ struct ip_conntrack_tuple_hash *h;
|
|
|
+ struct list_head *i;
|
|
|
+ u_int32_t *id = (u_int32_t *) &cb->args[1];
|
|
|
+
|
|
|
+ DEBUGP("entered %s, last bucket=%u id=%u\n", __FUNCTION__,
|
|
|
+ cb->args[0], *id);
|
|
|
+
|
|
|
+ write_lock_bh(&ip_conntrack_lock);
|
|
|
+ for (; cb->args[0] < ip_conntrack_htable_size; cb->args[0]++, *id = 0) {
|
|
|
+ list_for_each(i, &ip_conntrack_hash[cb->args[0]]) {
|
|
|
+ h = (struct ip_conntrack_tuple_hash *) i;
|
|
|
+ if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
|
|
|
+ continue;
|
|
|
+ ct = tuplehash_to_ctrack(h);
|
|
|
+ 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(&ip_conntrack_lock);
|
|
|
+
|
|
|
+ DEBUGP("leaving, last bucket=%lu id=%u\n", cb->args[0], *id);
|
|
|
+
|
|
|
+ return skb->len;
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
+static const int cta_min_ip[CTA_IP_MAX] = {
|
|
|
+ [CTA_IP_V4_SRC-1] = sizeof(u_int32_t),
|
|
|
+ [CTA_IP_V4_DST-1] = sizeof(u_int32_t),
|
|
|
+};
|
|
|
+
|
|
|
+static inline int
|
|
|
+ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
|
|
|
+{
|
|
|
+ struct nfattr *tb[CTA_IP_MAX];
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ memset(tb, 0, CTA_IP_MAX * sizeof(tb));
|
|
|
+
|
|
|
+ if (nfattr_parse_nested(tb, CTA_IP_MAX, attr) < 0)
|
|
|
+ goto nfattr_failure;
|
|
|
+
|
|
|
+ if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ if (!tb[CTA_IP_V4_SRC-1])
|
|
|
+ return -EINVAL;
|
|
|
+ tuple->src.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_SRC-1]);
|
|
|
+
|
|
|
+ if (!tb[CTA_IP_V4_DST-1])
|
|
|
+ return -EINVAL;
|
|
|
+ tuple->dst.ip = *(u_int32_t *)NFA_DATA(tb[CTA_IP_V4_DST-1]);
|
|
|
+
|
|
|
+ DEBUGP("leaving\n");
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+nfattr_failure:
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+static const int cta_min_proto[CTA_PROTO_MAX] = {
|
|
|
+ [CTA_PROTO_NUM-1] = sizeof(u_int16_t),
|
|
|
+ [CTA_PROTO_SRC_PORT-1] = sizeof(u_int16_t),
|
|
|
+ [CTA_PROTO_DST_PORT-1] = sizeof(u_int16_t),
|
|
|
+ [CTA_PROTO_ICMP_TYPE-1] = sizeof(u_int8_t),
|
|
|
+ [CTA_PROTO_ICMP_CODE-1] = sizeof(u_int8_t),
|
|
|
+ [CTA_PROTO_ICMP_ID-1] = sizeof(u_int16_t),
|
|
|
+};
|
|
|
+
|
|
|
+static inline int
|
|
|
+ctnetlink_parse_tuple_proto(struct nfattr *attr,
|
|
|
+ struct ip_conntrack_tuple *tuple)
|
|
|
+{
|
|
|
+ struct nfattr *tb[CTA_PROTO_MAX];
|
|
|
+ struct ip_conntrack_protocol *proto;
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ memset(tb, 0, CTA_PROTO_MAX * sizeof(tb));
|
|
|
+
|
|
|
+ if (nfattr_parse_nested(tb, CTA_PROTO_MAX, attr) < 0)
|
|
|
+ goto nfattr_failure;
|
|
|
+
|
|
|
+ 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_int16_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
|
|
|
+
|
|
|
+ proto = ip_conntrack_proto_find_get(tuple->dst.protonum);
|
|
|
+
|
|
|
+ if (likely(proto && proto->nfattr_to_tuple)) {
|
|
|
+ ret = proto->nfattr_to_tuple(tb, tuple);
|
|
|
+ ip_conntrack_proto_put(proto);
|
|
|
+ }
|
|
|
+
|
|
|
+ return ret;
|
|
|
+
|
|
|
+nfattr_failure:
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+static inline int
|
|
|
+ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
|
|
|
+ enum ctattr_tuple type)
|
|
|
+{
|
|
|
+ struct nfattr *tb[CTA_TUPLE_MAX];
|
|
|
+ int err;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ memset(tb, 0, CTA_TUPLE_MAX * sizeof(tb));
|
|
|
+ memset(tuple, 0, sizeof(*tuple));
|
|
|
+
|
|
|
+ if (nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]) < 0)
|
|
|
+ goto nfattr_failure;
|
|
|
+
|
|
|
+ if (!tb[CTA_TUPLE_IP-1])
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ 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;
|
|
|
+
|
|
|
+ DUMP_TUPLE(tuple);
|
|
|
+
|
|
|
+ DEBUGP("leaving\n");
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+nfattr_failure:
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+#ifdef CONFIG_IP_NF_NAT_NEEDED
|
|
|
+static const int 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 ip_conntrack *ct,
|
|
|
+ struct ip_nat_range *range)
|
|
|
+{
|
|
|
+ struct nfattr *tb[CTA_PROTONAT_MAX];
|
|
|
+ struct ip_nat_protocol *npt;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ memset(tb, 0, CTA_PROTONAT_MAX * sizeof(tb));
|
|
|
+
|
|
|
+ if (nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr) < 0)
|
|
|
+ goto nfattr_failure;
|
|
|
+
|
|
|
+ if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
|
|
|
+ goto nfattr_failure;
|
|
|
+
|
|
|
+ npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
|
|
|
+ if (!npt)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ 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;
|
|
|
+
|
|
|
+nfattr_failure:
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+static inline int
|
|
|
+ctnetlink_parse_nat(struct nfattr *cda[],
|
|
|
+ const struct ip_conntrack *ct, struct ip_nat_range *range)
|
|
|
+{
|
|
|
+ struct nfattr *tb[CTA_NAT_MAX];
|
|
|
+ int err;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ memset(tb, 0, CTA_NAT_MAX * sizeof(tb));
|
|
|
+ memset(range, 0, sizeof(*range));
|
|
|
+
|
|
|
+ if (nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]) < 0)
|
|
|
+ goto nfattr_failure;
|
|
|
+
|
|
|
+ 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;
|
|
|
+
|
|
|
+nfattr_failure:
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
+static inline int
|
|
|
+ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
|
|
|
+{
|
|
|
+ struct nfattr *tb[CTA_HELP_MAX];
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+ memset(tb, 0, CTA_HELP_MAX * sizeof(tb));
|
|
|
+
|
|
|
+ if (nfattr_parse_nested(tb, CTA_HELP_MAX, attr) < 0)
|
|
|
+ goto nfattr_failure;
|
|
|
+
|
|
|
+ if (!tb[CTA_HELP_NAME-1])
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+nfattr_failure:
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
|
|
|
+ struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
|
|
|
+{
|
|
|
+ struct ip_conntrack_tuple_hash *h;
|
|
|
+ struct ip_conntrack_tuple tuple;
|
|
|
+ struct ip_conntrack *ct;
|
|
|
+ int err = 0;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ if (cda[CTA_TUPLE_ORIG-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
|
|
|
+ else if (cda[CTA_TUPLE_REPLY-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
|
|
|
+ else {
|
|
|
+ /* Flush the whole table */
|
|
|
+ ip_conntrack_flush();
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ h = ip_conntrack_find_get(&tuple, NULL);
|
|
|
+ if (!h) {
|
|
|
+ DEBUGP("tuple not found in conntrack hash\n");
|
|
|
+ return -ENOENT;
|
|
|
+ }
|
|
|
+
|
|
|
+ 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) {
|
|
|
+ ip_conntrack_put(ct);
|
|
|
+ return -ENOENT;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (del_timer(&ct->timeout)) {
|
|
|
+ ip_conntrack_put(ct);
|
|
|
+ ct->timeout.function((unsigned long)ct);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ ip_conntrack_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 ip_conntrack_tuple_hash *h;
|
|
|
+ struct ip_conntrack_tuple tuple;
|
|
|
+ struct ip_conntrack *ct;
|
|
|
+ struct sk_buff *skb2 = NULL;
|
|
|
+ int err = 0;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
|
+ struct nfgenmsg *msg = NLMSG_DATA(nlh);
|
|
|
+ u32 rlen;
|
|
|
+
|
|
|
+ if (msg->nfgen_family != AF_INET)
|
|
|
+ return -EAFNOSUPPORT;
|
|
|
+
|
|
|
+ if (NFNL_MSG_TYPE(nlh->nlmsg_type) ==
|
|
|
+ IPCTNL_MSG_CT_GET_CTRZERO) {
|
|
|
+#ifdef CONFIG_IP_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 (cda[CTA_TUPLE_ORIG-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
|
|
|
+ else if (cda[CTA_TUPLE_REPLY-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
|
|
|
+ else
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ h = ip_conntrack_find_get(&tuple, NULL);
|
|
|
+ if (!h) {
|
|
|
+ DEBUGP("tuple not found in conntrack hash");
|
|
|
+ return -ENOENT;
|
|
|
+ }
|
|
|
+ DEBUGP("tuple found\n");
|
|
|
+ ct = tuplehash_to_ctrack(h);
|
|
|
+
|
|
|
+ err = -ENOMEM;
|
|
|
+ skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
|
|
|
+ if (!skb2) {
|
|
|
+ ip_conntrack_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);
|
|
|
+ ip_conntrack_put(ct);
|
|
|
+ if (err <= 0)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
|
+ if (err < 0)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ DEBUGP("leaving\n");
|
|
|
+ return 0;
|
|
|
+
|
|
|
+out:
|
|
|
+ if (skb2)
|
|
|
+ kfree_skb(skb2);
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+static inline int
|
|
|
+ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
|
|
|
+{
|
|
|
+ unsigned long d, status = *(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-1]) {
|
|
|
+#ifndef CONFIG_IP_NF_NAT_NEEDED
|
|
|
+ return -EINVAL;
|
|
|
+#else
|
|
|
+ unsigned int hooknum;
|
|
|
+ struct ip_nat_range range;
|
|
|
+
|
|
|
+ if (ctnetlink_parse_nat(cda, ct, &range) < 0)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
|
|
|
+ NIPQUAD(range.min_ip), NIPQUAD(range.max_ip),
|
|
|
+ htons(range.min.all), htons(range.max.all));
|
|
|
+
|
|
|
+ /* This is tricky but it works. ip_nat_setup_info needs the
|
|
|
+ * hook number as parameter, so let's do the correct
|
|
|
+ * conversion and run away */
|
|
|
+ if (status & IPS_SRC_NAT_DONE)
|
|
|
+ hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */
|
|
|
+ else if (status & IPS_DST_NAT_DONE)
|
|
|
+ hooknum = NF_IP_PRE_ROUTING; /* IP_NAT_MANIP_DST */
|
|
|
+ else
|
|
|
+ return -EINVAL; /* Missing NAT flags */
|
|
|
+
|
|
|
+ DEBUGP("NAT status: %lu\n",
|
|
|
+ status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
|
|
|
+
|
|
|
+ if (ip_nat_initialized(ct, hooknum))
|
|
|
+ return -EEXIST;
|
|
|
+ ip_nat_setup_info(ct, &range, hooknum);
|
|
|
+
|
|
|
+ DEBUGP("NAT status after setup_info: %lu\n",
|
|
|
+ ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
|
|
|
+#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 ip_conntrack *ct, struct nfattr *cda[])
|
|
|
+{
|
|
|
+ struct ip_conntrack_helper *helper;
|
|
|
+ char *helpname;
|
|
|
+ int err;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ /* 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 = __ip_conntrack_helper_find_byname(helpname);
|
|
|
+ if (!helper) {
|
|
|
+ if (!strcmp(helpname, ""))
|
|
|
+ helper = NULL;
|
|
|
+ else
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (ct->helper) {
|
|
|
+ if (!helper) {
|
|
|
+ /* we had a helper before ... */
|
|
|
+ ip_ct_remove_expectations(ct);
|
|
|
+ ct->helper = NULL;
|
|
|
+ } else {
|
|
|
+ /* need to zero data of old helper */
|
|
|
+ memset(&ct->help, 0, sizeof(ct->help));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ ct->helper = helper;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static inline int
|
|
|
+ctnetlink_change_timeout(struct ip_conntrack *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 int
|
|
|
+ctnetlink_change_conntrack(struct ip_conntrack *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;
|
|
|
+ }
|
|
|
+
|
|
|
+ DEBUGP("all done\n");
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+ctnetlink_create_conntrack(struct nfattr *cda[],
|
|
|
+ struct ip_conntrack_tuple *otuple,
|
|
|
+ struct ip_conntrack_tuple *rtuple)
|
|
|
+{
|
|
|
+ struct ip_conntrack *ct;
|
|
|
+ int err = -EINVAL;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ ct = ip_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;
|
|
|
+
|
|
|
+ ct->helper = ip_conntrack_helper_find_get(rtuple);
|
|
|
+
|
|
|
+ add_timer(&ct->timeout);
|
|
|
+ ip_conntrack_hash_insert(ct);
|
|
|
+
|
|
|
+ if (ct->helper)
|
|
|
+ ip_conntrack_helper_put(ct->helper);
|
|
|
+
|
|
|
+ DEBUGP("conntrack with id %u inserted\n", ct->id);
|
|
|
+ return 0;
|
|
|
+
|
|
|
+err:
|
|
|
+ ip_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 ip_conntrack_tuple otuple, rtuple;
|
|
|
+ struct ip_conntrack_tuple_hash *h = NULL;
|
|
|
+ int err = 0;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ if (cda[CTA_TUPLE_ORIG-1]) {
|
|
|
+ err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG);
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (cda[CTA_TUPLE_REPLY-1]) {
|
|
|
+ err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY);
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ write_lock_bh(&ip_conntrack_lock);
|
|
|
+ if (cda[CTA_TUPLE_ORIG-1])
|
|
|
+ h = __ip_conntrack_find(&otuple, NULL);
|
|
|
+ else if (cda[CTA_TUPLE_REPLY-1])
|
|
|
+ h = __ip_conntrack_find(&rtuple, NULL);
|
|
|
+
|
|
|
+ if (h == NULL) {
|
|
|
+ write_unlock_bh(&ip_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);
|
|
|
+ goto out_unlock;
|
|
|
+ } else {
|
|
|
+ /* we only allow nat config for new conntracks */
|
|
|
+ if (cda[CTA_NAT-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(tuplehash_to_ctrack(h), cda);
|
|
|
+
|
|
|
+out_unlock:
|
|
|
+ write_unlock_bh(&ip_conntrack_lock);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+/***********************************************************************
|
|
|
+ * EXPECT
|
|
|
+ ***********************************************************************/
|
|
|
+
|
|
|
+static inline int
|
|
|
+ctnetlink_exp_dump_tuple(struct sk_buff *skb,
|
|
|
+ const struct ip_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_expect(struct sk_buff *skb,
|
|
|
+ const struct ip_conntrack_expect *exp)
|
|
|
+{
|
|
|
+ u_int32_t timeout = htonl((exp->timeout.expires - jiffies) / HZ);
|
|
|
+ u_int32_t id = htonl(exp->id);
|
|
|
+ struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT);
|
|
|
+
|
|
|
+ if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
|
|
|
+ goto nfattr_failure;
|
|
|
+ if (ctnetlink_exp_dump_tuple(skb, &exp->mask, CTA_EXPECT_MASK) < 0)
|
|
|
+ goto nfattr_failure;
|
|
|
+
|
|
|
+ NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
|
|
|
+ NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
|
|
|
+ NFA_NEST_END(skb, nest_parms);
|
|
|
+
|
|
|
+ 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 ip_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 = AF_INET;
|
|
|
+ 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_IP_NF_CONNTRACK_EVENTS
|
|
|
+static int ctnetlink_expect_event(struct notifier_block *this,
|
|
|
+ unsigned long events, void *ptr)
|
|
|
+{
|
|
|
+ struct nlmsghdr *nlh;
|
|
|
+ struct nfgenmsg *nfmsg;
|
|
|
+ struct ip_conntrack_expect *exp = (struct ip_conntrack_expect *)ptr;
|
|
|
+ struct sk_buff *skb;
|
|
|
+ unsigned int type;
|
|
|
+ unsigned char *b;
|
|
|
+ int flags = 0;
|
|
|
+ u16 proto;
|
|
|
+
|
|
|
+ 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 << 8;
|
|
|
+ nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
|
|
|
+ nfmsg = NLMSG_DATA(nlh);
|
|
|
+
|
|
|
+ nlh->nlmsg_flags = flags;
|
|
|
+ nfmsg->nfgen_family = AF_INET;
|
|
|
+ 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;
|
|
|
+ proto = exp->tuple.dst.protonum;
|
|
|
+ nfnetlink_send(skb, 0, NF_NETLINK_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 ip_conntrack_expect *exp = NULL;
|
|
|
+ struct list_head *i;
|
|
|
+ u_int32_t *id = (u_int32_t *) &cb->args[0];
|
|
|
+
|
|
|
+ DEBUGP("entered %s, last id=%llu\n", __FUNCTION__, *id);
|
|
|
+
|
|
|
+ read_lock_bh(&ip_conntrack_lock);
|
|
|
+ list_for_each(i, &ip_conntrack_expect_list) {
|
|
|
+ exp = (struct ip_conntrack_expect *) i;
|
|
|
+ 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(&ip_conntrack_lock);
|
|
|
+
|
|
|
+ DEBUGP("leaving, last id=%llu\n", *id);
|
|
|
+
|
|
|
+ return skb->len;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
|
|
|
+ struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
|
|
|
+{
|
|
|
+ struct ip_conntrack_tuple tuple;
|
|
|
+ struct ip_conntrack_expect *exp;
|
|
|
+ struct sk_buff *skb2;
|
|
|
+ int err = 0;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
|
+ struct nfgenmsg *msg = NLMSG_DATA(nlh);
|
|
|
+ u32 rlen;
|
|
|
+
|
|
|
+ if (msg->nfgen_family != AF_INET)
|
|
|
+ return -EAFNOSUPPORT;
|
|
|
+
|
|
|
+ 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_TUPLE_ORIG-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
|
|
|
+ else if (cda[CTA_TUPLE_REPLY-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
|
|
|
+ else
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ exp = ip_conntrack_expect_find_get(&tuple);
|
|
|
+ if (!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 out;
|
|
|
+
|
|
|
+ ip_conntrack_expect_put(exp);
|
|
|
+
|
|
|
+ err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
|
|
|
+ if (err < 0)
|
|
|
+ goto free;
|
|
|
+
|
|
|
+ return err;
|
|
|
+
|
|
|
+out:
|
|
|
+ ip_conntrack_expect_put(exp);
|
|
|
+free:
|
|
|
+ if (skb2)
|
|
|
+ kfree_skb(skb2);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
|
|
|
+ struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
|
|
|
+{
|
|
|
+ struct ip_conntrack_expect *exp, *tmp;
|
|
|
+ struct ip_conntrack_tuple tuple;
|
|
|
+ struct ip_conntrack_helper *h;
|
|
|
+ int err;
|
|
|
+
|
|
|
+ /* delete by tuple needs either orig or reply tuple */
|
|
|
+ if (cda[CTA_TUPLE_ORIG-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG);
|
|
|
+ else if (cda[CTA_TUPLE_REPLY-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY);
|
|
|
+ else if (cda[CTA_HELP_NAME-1]) {
|
|
|
+ char *name = NFA_DATA(cda[CTA_HELP_NAME-1]);
|
|
|
+
|
|
|
+ /* delete all expectations for this helper */
|
|
|
+ write_lock_bh(&ip_conntrack_lock);
|
|
|
+ h = __ip_conntrack_helper_find_byname(name);
|
|
|
+ if (!h) {
|
|
|
+ write_unlock_bh(&ip_conntrack_lock);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+ list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
|
|
|
+ list) {
|
|
|
+ if (exp->master->helper == h
|
|
|
+ && del_timer(&exp->timeout))
|
|
|
+ __ip_ct_expect_unlink_destroy(exp);
|
|
|
+ }
|
|
|
+ write_unlock(&ip_conntrack_lock);
|
|
|
+ return 0;
|
|
|
+ } else {
|
|
|
+ /* This basically means we have to flush everything*/
|
|
|
+ write_lock_bh(&ip_conntrack_lock);
|
|
|
+ list_for_each_entry_safe(exp, tmp, &ip_conntrack_expect_list,
|
|
|
+ list) {
|
|
|
+ if (del_timer(&exp->timeout))
|
|
|
+ __ip_ct_expect_unlink_destroy(exp);
|
|
|
+ }
|
|
|
+ write_unlock_bh(&ip_conntrack_lock);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ /* bump usage count to 2 */
|
|
|
+ exp = ip_conntrack_expect_find_get(&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)) {
|
|
|
+ ip_conntrack_expect_put(exp);
|
|
|
+ return -ENOENT;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* after list removal, usage count == 1 */
|
|
|
+ ip_conntrack_unexpect_related(exp);
|
|
|
+ /* have to put what we 'get' above. after this line usage count == 0 */
|
|
|
+ ip_conntrack_expect_put(exp);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+static int
|
|
|
+ctnetlink_change_expect(struct ip_conntrack_expect *x, struct nfattr *cda[])
|
|
|
+{
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+ctnetlink_create_expect(struct nfattr *cda[])
|
|
|
+{
|
|
|
+ struct ip_conntrack_tuple tuple, mask, master_tuple;
|
|
|
+ struct ip_conntrack_tuple_hash *h = NULL;
|
|
|
+ struct ip_conntrack_expect *exp;
|
|
|
+ struct ip_conntrack *ct;
|
|
|
+ int err = 0;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASK);
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ if (cda[CTA_TUPLE_ORIG-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_TUPLE_ORIG);
|
|
|
+ else if (cda[CTA_TUPLE_REPLY-1])
|
|
|
+ err = ctnetlink_parse_tuple(cda, &master_tuple,
|
|
|
+ CTA_TUPLE_REPLY);
|
|
|
+ else
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ /* Look for master conntrack of this expectation */
|
|
|
+ h = ip_conntrack_find_get(&master_tuple, NULL);
|
|
|
+ if (!h)
|
|
|
+ return -ENOENT;
|
|
|
+ ct = tuplehash_to_ctrack(h);
|
|
|
+
|
|
|
+ if (!ct->helper) {
|
|
|
+ /* such conntrack hasn't got any helper, abort */
|
|
|
+ err = -EINVAL;
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ exp = ip_conntrack_expect_alloc(ct);
|
|
|
+ if (!exp) {
|
|
|
+ err = -ENOMEM;
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ exp->expectfn = NULL;
|
|
|
+ exp->master = ct;
|
|
|
+ memcpy(&exp->tuple, &tuple, sizeof(struct ip_conntrack_tuple));
|
|
|
+ memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple));
|
|
|
+
|
|
|
+ err = ip_conntrack_expect_related(exp);
|
|
|
+ ip_conntrack_expect_put(exp);
|
|
|
+
|
|
|
+out:
|
|
|
+ ip_conntrack_put(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 ip_conntrack_tuple tuple;
|
|
|
+ struct ip_conntrack_expect *exp;
|
|
|
+ int err = 0;
|
|
|
+
|
|
|
+ DEBUGP("entered %s\n", __FUNCTION__);
|
|
|
+
|
|
|
+ if (!cda[CTA_EXPECT_TUPLE-1] || !cda[CTA_EXPECT_MASK-1])
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE);
|
|
|
+ if (err < 0)
|
|
|
+ return err;
|
|
|
+
|
|
|
+ write_lock_bh(&ip_conntrack_lock);
|
|
|
+ exp = __ip_conntrack_expect_find(&tuple);
|
|
|
+
|
|
|
+ if (!exp) {
|
|
|
+ write_unlock_bh(&ip_conntrack_lock);
|
|
|
+ err = -ENOENT;
|
|
|
+ if (nlh->nlmsg_flags & NLM_F_CREATE)
|
|
|
+ err = ctnetlink_create_expect(cda);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = -EEXIST;
|
|
|
+ if (!(nlh->nlmsg_flags & NLM_F_EXCL))
|
|
|
+ err = ctnetlink_change_expect(exp, cda);
|
|
|
+ write_unlock_bh(&ip_conntrack_lock);
|
|
|
+
|
|
|
+ DEBUGP("leaving\n");
|
|
|
+
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+#ifdef CONFIG_IP_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,
|
|
|
+ .cap_required = CAP_NET_ADMIN },
|
|
|
+ [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
|
|
|
+ .cap_required = CAP_NET_ADMIN },
|
|
|
+ [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
|
|
|
+ .cap_required = CAP_NET_ADMIN },
|
|
|
+ [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
|
|
|
+ .cap_required = CAP_NET_ADMIN },
|
|
|
+};
|
|
|
+
|
|
|
+static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_MAX] = {
|
|
|
+ [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
|
|
|
+ .cap_required = CAP_NET_ADMIN },
|
|
|
+ [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
|
|
|
+ .cap_required = CAP_NET_ADMIN },
|
|
|
+ [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
|
|
|
+ .cap_required = CAP_NET_ADMIN },
|
|
|
+};
|
|
|
+
|
|
|
+static struct nfnetlink_subsystem ctnl_subsys = {
|
|
|
+ .name = "conntrack",
|
|
|
+ .subsys_id = NFNL_SUBSYS_CTNETLINK,
|
|
|
+ .cb_count = IPCTNL_MSG_MAX,
|
|
|
+ .attr_count = CTA_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,
|
|
|
+ .attr_count = CTA_MAX,
|
|
|
+ .cb = ctnl_exp_cb,
|
|
|
+};
|
|
|
+
|
|
|
+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_IP_NF_CONNTRACK_EVENTS
|
|
|
+ ret = ip_conntrack_register_notifier(&ctnl_notifier);
|
|
|
+ if (ret < 0) {
|
|
|
+ printk("ctnetlink_init: cannot register notifier.\n");
|
|
|
+ goto err_unreg_exp_subsys;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = ip_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_IP_NF_CONNTRACK_EVENTS
|
|
|
+err_unreg_notifier:
|
|
|
+ ip_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_IP_NF_CONNTRACK_EVENTS
|
|
|
+ ip_conntrack_unregister_notifier(&ctnl_notifier_exp);
|
|
|
+ ip_conntrack_unregister_notifier(&ctnl_notifier);
|
|
|
+#endif
|
|
|
+
|
|
|
+ nfnetlink_subsys_unregister(&ctnl_exp_subsys);
|
|
|
+ nfnetlink_subsys_unregister(&ctnl_subsys);
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+module_init(ctnetlink_init);
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+module_exit(ctnetlink_exit);
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Harald Welte