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_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 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly
=
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
,