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Linux/net/netfilter/nf_conntrack_proto_generic.c

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  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 
 17 static inline struct nf_generic_net *generic_pernet(struct net *net)
 18 {
 19         return &net->ct.nf_ct_proto.generic;
 20 }
 21 
 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 
 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. */
 42 static int generic_print_tuple(struct seq_file *s,
 43                                const struct nf_conntrack_tuple *tuple)
 44 {
 45         return 0;
 46 }
 47 
 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. */
 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. */
 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 
 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
 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 
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 
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 
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 
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 

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