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>
15 static const unsigned int nf_ct_generic_timeout = 600*HZ;
17 static bool nf_generic_should_process(u8 proto)
20 #ifdef CONFIG_NF_CT_PROTO_GRE_MODULE
29 static inline struct nf_generic_net *generic_pernet(struct net *net)
31 return &net->ct.nf_ct_proto.generic;
34 static bool generic_pkt_to_tuple(const struct sk_buff *skb,
36 struct net *net, struct nf_conntrack_tuple *tuple)
44 static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
45 const struct nf_conntrack_tuple *orig)
53 static unsigned int *generic_get_timeouts(struct net *net)
55 return &(generic_pernet(net)->timeout);
58 /* Returns verdict for packet, or -1 for invalid. */
59 static int generic_packet(struct nf_conn *ct,
60 const struct sk_buff *skb,
62 enum ip_conntrack_info ctinfo,
63 unsigned int *timeout)
65 nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
69 /* Called when a new connection for this protocol found. */
70 static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
71 unsigned int dataoff, unsigned int *timeouts)
75 ret = nf_generic_should_process(nf_ct_protonum(ct));
77 pr_warn_once("conntrack: generic helper won't handle protocol %d. Please consider loading the specific helper module.\n",
82 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
84 #include <linux/netfilter/nfnetlink.h>
85 #include <linux/netfilter/nfnetlink_cttimeout.h>
87 static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
88 struct net *net, void *data)
90 unsigned int *timeout = data;
91 struct nf_generic_net *gn = generic_pernet(net);
93 if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
95 ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
97 /* Set default generic timeout. */
98 *timeout = gn->timeout;
105 generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
107 const unsigned int *timeout = data;
109 if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
110 goto nla_put_failure;
118 static const struct nla_policy
119 generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
120 [CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 },
122 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
125 static struct ctl_table generic_sysctl_table[] = {
127 .procname = "nf_conntrack_generic_timeout",
128 .maxlen = sizeof(unsigned int),
130 .proc_handler = proc_dointvec_jiffies,
134 #endif /* CONFIG_SYSCTL */
136 static int generic_kmemdup_sysctl_table(struct nf_proto_net *pn,
137 struct nf_generic_net *gn)
140 pn->ctl_table = kmemdup(generic_sysctl_table,
141 sizeof(generic_sysctl_table),
146 pn->ctl_table[0].data = &gn->timeout;
151 static int generic_init_net(struct net *net, u_int16_t proto)
153 struct nf_generic_net *gn = generic_pernet(net);
154 struct nf_proto_net *pn = &gn->pn;
156 gn->timeout = nf_ct_generic_timeout;
158 return generic_kmemdup_sysctl_table(pn, gn);
161 static struct nf_proto_net *generic_get_net_proto(struct net *net)
163 return &net->ct.nf_ct_proto.generic.pn;
166 const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
168 .l3proto = PF_UNSPEC,
170 .pkt_to_tuple = generic_pkt_to_tuple,
171 .invert_tuple = generic_invert_tuple,
172 .packet = generic_packet,
173 .get_timeouts = generic_get_timeouts,
175 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
177 .nlattr_to_obj = generic_timeout_nlattr_to_obj,
178 .obj_to_nlattr = generic_timeout_obj_to_nlattr,
179 .nlattr_max = CTA_TIMEOUT_GENERIC_MAX,
180 .obj_size = sizeof(unsigned int),
181 .nla_policy = generic_timeout_nla_policy,
183 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
184 .init_net = generic_init_net,
185 .get_net_proto = generic_get_net_proto,