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 int generic_print_tuple(struct seq_file *s,
67 const struct nf_conntrack_tuple *tuple)
72 static unsigned int *generic_get_timeouts(struct net *net)
74 return &(generic_pernet(net)->timeout);
77 /* Returns verdict for packet, or -1 for invalid. */
78 static int generic_packet(struct nf_conn *ct,
79 const struct sk_buff *skb,
81 enum ip_conntrack_info ctinfo,
84 unsigned int *timeout)
86 nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
90 /* Called when a new connection for this protocol found. */
91 static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
92 unsigned int dataoff, unsigned int *timeouts)
94 return nf_generic_should_process(nf_ct_protonum(ct));
97 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
99 #include <linux/netfilter/nfnetlink.h>
100 #include <linux/netfilter/nfnetlink_cttimeout.h>
102 static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
103 struct net *net, void *data)
105 unsigned int *timeout = data;
106 struct nf_generic_net *gn = generic_pernet(net);
108 if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
110 ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
112 /* Set default generic timeout. */
113 *timeout = gn->timeout;
120 generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
122 const unsigned int *timeout = data;
124 if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
125 goto nla_put_failure;
133 static const struct nla_policy
134 generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
135 [CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 },
137 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
140 static struct ctl_table generic_sysctl_table[] = {
142 .procname = "nf_conntrack_generic_timeout",
143 .maxlen = sizeof(unsigned int),
145 .proc_handler = proc_dointvec_jiffies,
149 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
150 static struct ctl_table generic_compat_sysctl_table[] = {
152 .procname = "ip_conntrack_generic_timeout",
153 .maxlen = sizeof(unsigned int),
155 .proc_handler = proc_dointvec_jiffies,
159 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
160 #endif /* CONFIG_SYSCTL */
162 static int generic_kmemdup_sysctl_table(struct nf_proto_net *pn,
163 struct nf_generic_net *gn)
166 pn->ctl_table = kmemdup(generic_sysctl_table,
167 sizeof(generic_sysctl_table),
172 pn->ctl_table[0].data = &gn->timeout;
177 static int generic_kmemdup_compat_sysctl_table(struct nf_proto_net *pn,
178 struct nf_generic_net *gn)
181 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
182 pn->ctl_compat_table = kmemdup(generic_compat_sysctl_table,
183 sizeof(generic_compat_sysctl_table),
185 if (!pn->ctl_compat_table)
188 pn->ctl_compat_table[0].data = &gn->timeout;
194 static int generic_init_net(struct net *net, u_int16_t proto)
197 struct nf_generic_net *gn = generic_pernet(net);
198 struct nf_proto_net *pn = &gn->pn;
200 gn->timeout = nf_ct_generic_timeout;
202 ret = generic_kmemdup_compat_sysctl_table(pn, gn);
206 ret = generic_kmemdup_sysctl_table(pn, gn);
208 nf_ct_kfree_compat_sysctl_table(pn);
213 static struct nf_proto_net *generic_get_net_proto(struct net *net)
215 return &net->ct.nf_ct_proto.generic.pn;
218 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
220 .l3proto = PF_UNSPEC,
223 .pkt_to_tuple = generic_pkt_to_tuple,
224 .invert_tuple = generic_invert_tuple,
225 .print_tuple = generic_print_tuple,
226 .packet = generic_packet,
227 .get_timeouts = generic_get_timeouts,
229 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
231 .nlattr_to_obj = generic_timeout_nlattr_to_obj,
232 .obj_to_nlattr = generic_timeout_obj_to_nlattr,
233 .nlattr_max = CTA_TIMEOUT_GENERIC_MAX,
234 .obj_size = sizeof(unsigned int),
235 .nla_policy = generic_timeout_nla_policy,
237 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
238 .init_net = generic_init_net,
239 .get_net_proto = generic_get_net_proto,