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 unsigned int nf_ct_generic_timeout __read_mostly = 600*HZ;
17 static bool nf_generic_should_process(u8 proto)
20 #ifdef CONFIG_NF_CT_PROTO_SCTP_MODULE
24 #ifdef CONFIG_NF_CT_PROTO_DCCP_MODULE
28 #ifdef CONFIG_NF_CT_PROTO_GRE_MODULE
32 #ifdef CONFIG_NF_CT_PROTO_UDPLITE_MODULE
41 static inline struct nf_generic_net *generic_pernet(struct net *net)
43 return &net->ct.nf_ct_proto.generic;
46 static bool generic_pkt_to_tuple(const struct sk_buff *skb,
48 struct nf_conntrack_tuple *tuple)
56 static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
57 const struct nf_conntrack_tuple *orig)
65 /* Print out the per-protocol part of the tuple. */
66 static void generic_print_tuple(struct seq_file *s,
67 const struct nf_conntrack_tuple *tuple)
71 static unsigned int *generic_get_timeouts(struct net *net)
73 return &(generic_pernet(net)->timeout);
76 /* Returns verdict for packet, or -1 for invalid. */
77 static int generic_packet(struct nf_conn *ct,
78 const struct sk_buff *skb,
80 enum ip_conntrack_info ctinfo,
83 unsigned int *timeout)
85 nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
89 /* Called when a new connection for this protocol found. */
90 static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
91 unsigned int dataoff, unsigned int *timeouts)
93 return nf_generic_should_process(nf_ct_protonum(ct));
96 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
98 #include <linux/netfilter/nfnetlink.h>
99 #include <linux/netfilter/nfnetlink_cttimeout.h>
101 static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
102 struct net *net, void *data)
104 unsigned int *timeout = data;
105 struct nf_generic_net *gn = generic_pernet(net);
107 if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
109 ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
111 /* Set default generic timeout. */
112 *timeout = gn->timeout;
119 generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
121 const unsigned int *timeout = data;
123 if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
124 goto nla_put_failure;
132 static const struct nla_policy
133 generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
134 [CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 },
136 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
139 static struct ctl_table generic_sysctl_table[] = {
141 .procname = "nf_conntrack_generic_timeout",
142 .maxlen = sizeof(unsigned int),
144 .proc_handler = proc_dointvec_jiffies,
148 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
149 static struct ctl_table generic_compat_sysctl_table[] = {
151 .procname = "ip_conntrack_generic_timeout",
152 .maxlen = sizeof(unsigned int),
154 .proc_handler = proc_dointvec_jiffies,
158 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
159 #endif /* CONFIG_SYSCTL */
161 static int generic_kmemdup_sysctl_table(struct nf_proto_net *pn,
162 struct nf_generic_net *gn)
165 pn->ctl_table = kmemdup(generic_sysctl_table,
166 sizeof(generic_sysctl_table),
171 pn->ctl_table[0].data = &gn->timeout;
176 static int generic_kmemdup_compat_sysctl_table(struct nf_proto_net *pn,
177 struct nf_generic_net *gn)
180 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
181 pn->ctl_compat_table = kmemdup(generic_compat_sysctl_table,
182 sizeof(generic_compat_sysctl_table),
184 if (!pn->ctl_compat_table)
187 pn->ctl_compat_table[0].data = &gn->timeout;
193 static int generic_init_net(struct net *net, u_int16_t proto)
196 struct nf_generic_net *gn = generic_pernet(net);
197 struct nf_proto_net *pn = &gn->pn;
199 gn->timeout = nf_ct_generic_timeout;
201 ret = generic_kmemdup_compat_sysctl_table(pn, gn);
205 ret = generic_kmemdup_sysctl_table(pn, gn);
207 nf_ct_kfree_compat_sysctl_table(pn);
212 static struct nf_proto_net *generic_get_net_proto(struct net *net)
214 return &net->ct.nf_ct_proto.generic.pn;
217 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
219 .l3proto = PF_UNSPEC,
222 .pkt_to_tuple = generic_pkt_to_tuple,
223 .invert_tuple = generic_invert_tuple,
224 .print_tuple = generic_print_tuple,
225 .packet = generic_packet,
226 .get_timeouts = generic_get_timeouts,
228 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
230 .nlattr_to_obj = generic_timeout_nlattr_to_obj,
231 .obj_to_nlattr = generic_timeout_obj_to_nlattr,
232 .nlattr_max = CTA_TIMEOUT_GENERIC_MAX,
233 .obj_size = sizeof(unsigned int),
234 .nla_policy = generic_timeout_nla_policy,
236 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
237 .init_net = generic_init_net,
238 .get_net_proto = generic_get_net_proto,