1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
3 *
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.
7 */
8
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
15 static unsigned int nf_ct_generic_timeout __read_mostly = 600*HZ;
16
generic_pernet(struct net * net)17 static inline struct nf_generic_net *generic_pernet(struct net *net)
18 {
19 return &net->ct.nf_ct_proto.generic;
20 }
21
generic_pkt_to_tuple(const struct sk_buff * skb,unsigned int dataoff,struct nf_conntrack_tuple * tuple)22 static bool generic_pkt_to_tuple(const struct sk_buff *skb,
23 unsigned int dataoff,
24 struct nf_conntrack_tuple *tuple)
25 {
26 tuple->src.u.all = 0;
27 tuple->dst.u.all = 0;
28
29 return true;
30 }
31
generic_invert_tuple(struct nf_conntrack_tuple * tuple,const struct nf_conntrack_tuple * orig)32 static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
33 const struct nf_conntrack_tuple *orig)
34 {
35 tuple->src.u.all = 0;
36 tuple->dst.u.all = 0;
37
38 return true;
39 }
40
41 /* Print out the per-protocol part of the tuple. */
generic_print_tuple(struct seq_file * s,const struct nf_conntrack_tuple * tuple)42 static int generic_print_tuple(struct seq_file *s,
43 const struct nf_conntrack_tuple *tuple)
44 {
45 return 0;
46 }
47
generic_get_timeouts(struct net * net)48 static unsigned int *generic_get_timeouts(struct net *net)
49 {
50 return &(generic_pernet(net)->timeout);
51 }
52
53 /* Returns verdict for packet, or -1 for invalid. */
generic_packet(struct nf_conn * ct,const struct sk_buff * skb,unsigned int dataoff,enum ip_conntrack_info ctinfo,u_int8_t pf,unsigned int hooknum,unsigned int * timeout)54 static int generic_packet(struct nf_conn *ct,
55 const struct sk_buff *skb,
56 unsigned int dataoff,
57 enum ip_conntrack_info ctinfo,
58 u_int8_t pf,
59 unsigned int hooknum,
60 unsigned int *timeout)
61 {
62 nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
63 return NF_ACCEPT;
64 }
65
66 /* Called when a new connection for this protocol found. */
generic_new(struct nf_conn * ct,const struct sk_buff * skb,unsigned int dataoff,unsigned int * timeouts)67 static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
68 unsigned int dataoff, unsigned int *timeouts)
69 {
70 return true;
71 }
72
73 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
74
75 #include <linux/netfilter/nfnetlink.h>
76 #include <linux/netfilter/nfnetlink_cttimeout.h>
77
generic_timeout_nlattr_to_obj(struct nlattr * tb[],struct net * net,void * data)78 static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
79 struct net *net, void *data)
80 {
81 unsigned int *timeout = data;
82 struct nf_generic_net *gn = generic_pernet(net);
83
84 if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
85 *timeout =
86 ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
87 else {
88 /* Set default generic timeout. */
89 *timeout = gn->timeout;
90 }
91
92 return 0;
93 }
94
95 static int
generic_timeout_obj_to_nlattr(struct sk_buff * skb,const void * data)96 generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
97 {
98 const unsigned int *timeout = data;
99
100 if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
101 goto nla_put_failure;
102
103 return 0;
104
105 nla_put_failure:
106 return -ENOSPC;
107 }
108
109 static const struct nla_policy
110 generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
111 [CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 },
112 };
113 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
114
115 #ifdef CONFIG_SYSCTL
116 static struct ctl_table generic_sysctl_table[] = {
117 {
118 .procname = "nf_conntrack_generic_timeout",
119 .maxlen = sizeof(unsigned int),
120 .mode = 0644,
121 .proc_handler = proc_dointvec_jiffies,
122 },
123 { }
124 };
125 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
126 static struct ctl_table generic_compat_sysctl_table[] = {
127 {
128 .procname = "ip_conntrack_generic_timeout",
129 .maxlen = sizeof(unsigned int),
130 .mode = 0644,
131 .proc_handler = proc_dointvec_jiffies,
132 },
133 { }
134 };
135 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
136 #endif /* CONFIG_SYSCTL */
137
generic_kmemdup_sysctl_table(struct nf_proto_net * pn,struct nf_generic_net * gn)138 static int generic_kmemdup_sysctl_table(struct nf_proto_net *pn,
139 struct nf_generic_net *gn)
140 {
141 #ifdef CONFIG_SYSCTL
142 pn->ctl_table = kmemdup(generic_sysctl_table,
143 sizeof(generic_sysctl_table),
144 GFP_KERNEL);
145 if (!pn->ctl_table)
146 return -ENOMEM;
147
148 pn->ctl_table[0].data = &gn->timeout;
149 #endif
150 return 0;
151 }
152
generic_kmemdup_compat_sysctl_table(struct nf_proto_net * pn,struct nf_generic_net * gn)153 static int generic_kmemdup_compat_sysctl_table(struct nf_proto_net *pn,
154 struct nf_generic_net *gn)
155 {
156 #ifdef CONFIG_SYSCTL
157 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
158 pn->ctl_compat_table = kmemdup(generic_compat_sysctl_table,
159 sizeof(generic_compat_sysctl_table),
160 GFP_KERNEL);
161 if (!pn->ctl_compat_table)
162 return -ENOMEM;
163
164 pn->ctl_compat_table[0].data = &gn->timeout;
165 #endif
166 #endif
167 return 0;
168 }
169
generic_init_net(struct net * net,u_int16_t proto)170 static int generic_init_net(struct net *net, u_int16_t proto)
171 {
172 int ret;
173 struct nf_generic_net *gn = generic_pernet(net);
174 struct nf_proto_net *pn = &gn->pn;
175
176 gn->timeout = nf_ct_generic_timeout;
177
178 ret = generic_kmemdup_compat_sysctl_table(pn, gn);
179 if (ret < 0)
180 return ret;
181
182 ret = generic_kmemdup_sysctl_table(pn, gn);
183 if (ret < 0)
184 nf_ct_kfree_compat_sysctl_table(pn);
185
186 return ret;
187 }
188
generic_get_net_proto(struct net * net)189 static struct nf_proto_net *generic_get_net_proto(struct net *net)
190 {
191 return &net->ct.nf_ct_proto.generic.pn;
192 }
193
194 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
195 {
196 .l3proto = PF_UNSPEC,
197 .l4proto = 255,
198 .name = "unknown",
199 .pkt_to_tuple = generic_pkt_to_tuple,
200 .invert_tuple = generic_invert_tuple,
201 .print_tuple = generic_print_tuple,
202 .packet = generic_packet,
203 .get_timeouts = generic_get_timeouts,
204 .new = generic_new,
205 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
206 .ctnl_timeout = {
207 .nlattr_to_obj = generic_timeout_nlattr_to_obj,
208 .obj_to_nlattr = generic_timeout_obj_to_nlattr,
209 .nlattr_max = CTA_TIMEOUT_GENERIC_MAX,
210 .obj_size = sizeof(unsigned int),
211 .nla_policy = generic_timeout_nla_policy,
212 },
213 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
214 .init_net = generic_init_net,
215 .get_net_proto = generic_get_net_proto,
216 };
217