1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/types.h>
10 #include <linux/jiffies.h>
11 #include <linux/timer.h>
12 #include <linux/netfilter.h>
13 #include <net/netfilter/nf_conntrack_l4proto.h>
14 #include <net/netfilter/nf_conntrack_timeout.h>
16 static const unsigned int nf_ct_generic_timeout = 600*HZ;
18 static bool nf_generic_should_process(u8 proto)
21 #ifdef CONFIG_NF_CT_PROTO_GRE_MODULE
30 static inline struct nf_generic_net *generic_pernet(struct net *net)
32 return &net->ct.nf_ct_proto.generic;
35 static bool generic_pkt_to_tuple(const struct sk_buff *skb,
37 struct net *net, struct nf_conntrack_tuple *tuple)
45 /* Returns verdict for packet, or -1 for invalid. */
46 static int generic_packet(struct nf_conn *ct,
47 const struct sk_buff *skb,
49 enum ip_conntrack_info ctinfo)
51 const unsigned int *timeout = nf_ct_timeout_lookup(ct);
54 timeout = &generic_pernet(nf_ct_net(ct))->timeout;
56 nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
60 /* Called when a new connection for this protocol found. */
61 static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
66 ret = nf_generic_should_process(nf_ct_protonum(ct));
68 pr_warn_once("conntrack: generic helper won't handle protocol %d. Please consider loading the specific helper module.\n",
73 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
75 #include <linux/netfilter/nfnetlink.h>
76 #include <linux/netfilter/nfnetlink_cttimeout.h>
78 static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
79 struct net *net, void *data)
81 struct nf_generic_net *gn = generic_pernet(net);
82 unsigned int *timeout = data;
85 timeout = &gn->timeout;
87 if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
89 ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
91 /* Set default generic timeout. */
92 *timeout = gn->timeout;
99 generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
101 const unsigned int *timeout = data;
103 if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
104 goto nla_put_failure;
112 static const struct nla_policy
113 generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
114 [CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 },
116 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
119 static struct ctl_table generic_sysctl_table[] = {
121 .procname = "nf_conntrack_generic_timeout",
122 .maxlen = sizeof(unsigned int),
124 .proc_handler = proc_dointvec_jiffies,
128 #endif /* CONFIG_SYSCTL */
130 static int generic_kmemdup_sysctl_table(struct nf_proto_net *pn,
131 struct nf_generic_net *gn)
134 pn->ctl_table = kmemdup(generic_sysctl_table,
135 sizeof(generic_sysctl_table),
140 pn->ctl_table[0].data = &gn->timeout;
145 static int generic_init_net(struct net *net, u_int16_t proto)
147 struct nf_generic_net *gn = generic_pernet(net);
148 struct nf_proto_net *pn = &gn->pn;
150 gn->timeout = nf_ct_generic_timeout;
152 return generic_kmemdup_sysctl_table(pn, gn);
155 static struct nf_proto_net *generic_get_net_proto(struct net *net)
157 return &net->ct.nf_ct_proto.generic.pn;
160 const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
162 .l3proto = PF_UNSPEC,
164 .pkt_to_tuple = generic_pkt_to_tuple,
165 .packet = generic_packet,
167 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
169 .nlattr_to_obj = generic_timeout_nlattr_to_obj,
170 .obj_to_nlattr = generic_timeout_obj_to_nlattr,
171 .nlattr_max = CTA_TIMEOUT_GENERIC_MAX,
172 .obj_size = sizeof(unsigned int),
173 .nla_policy = generic_timeout_nla_policy,
175 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
176 .init_net = generic_init_net,
177 .get_net_proto = generic_get_net_proto,