net/netfilter/nf_conntrack_proto_generic.c

   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 bool generic_pkt_to_tuple(const struct sk_buff *skb,
  18                                  unsigned int dataoff,
  19                                  struct nf_conntrack_tuple *tuple)
  20 {
  21         tuple->src.u.all = 0;
  22         tuple->dst.u.all = 0;
  23
  24         return true;
  25 }
  26
  27 static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
  28                                  const struct nf_conntrack_tuple *orig)
  29 {
  30         tuple->src.u.all = 0;
  31         tuple->dst.u.all = 0;
  32
  33         return true;
  34 }
  35
  36 /* Print out the per-protocol part of the tuple. */
  37 static int generic_print_tuple(struct seq_file *s,
  38                                const struct nf_conntrack_tuple *tuple)
  39 {
  40         return 0;
  41 }
  42
  43 static unsigned int *generic_get_timeouts(struct net *net)
  44 {
  45         return &nf_ct_generic_timeout;
  46 }
  47
  48 /* Returns verdict for packet, or -1 for invalid. */
  49 static int generic_packet(struct nf_conn *ct,
  50                           const struct sk_buff *skb,
  51                           unsigned int dataoff,
  52                           enum ip_conntrack_info ctinfo,
  53                           u_int8_t pf,
  54                           unsigned int hooknum,
  55                           unsigned int *timeout)
  56 {
  57         nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
  58         return NF_ACCEPT;
  59 }
  60
  61 /* Called when a new connection for this protocol found. */
  62 static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
  63                         unsigned int dataoff, unsigned int *timeouts)
  64 {
  65         return true;
  66 }
  67
  68 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
  69
  70 #include <linux/netfilter/nfnetlink.h>
  71 #include <linux/netfilter/nfnetlink_cttimeout.h>
  72
  73 static int generic_timeout_nlattr_to_obj(struct nlattr *tb[], void *data)
  74 {
  75         unsigned int *timeout = data;
  76
  77         if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
  78                 *timeout =
  79                     ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
  80         else {
  81                 /* Set default generic timeout. */
  82                 *timeout = nf_ct_generic_timeout;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static int
  89 generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
  90 {
  91         const unsigned int *timeout = data;
  92
  93         if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
  94                 goto nla_put_failure;
  95
  96         return 0;
  97
  98 nla_put_failure:
  99         return -ENOSPC;
 100 }
 101
 102 static const struct nla_policy
 103 generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
 104         [CTA_TIMEOUT_GENERIC_TIMEOUT]   = { .type = NLA_U32 },
 105 };
 106 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
 107
 108 #ifdef CONFIG_SYSCTL
 109 static struct ctl_table_header *generic_sysctl_header;
 110 static struct ctl_table generic_sysctl_table[] = {
 111         {
 112                 .procname       = "nf_conntrack_generic_timeout",
 113                 .data           = &nf_ct_generic_timeout,
 114                 .maxlen         = sizeof(unsigned int),
 115                 .mode           = 0644,
 116                 .proc_handler   = proc_dointvec_jiffies,
 117         },
 118         { }
 119 };
 120 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 121 static struct ctl_table generic_compat_sysctl_table[] = {
 122         {
 123                 .procname       = "ip_conntrack_generic_timeout",
 124                 .data           = &nf_ct_generic_timeout,
 125                 .maxlen         = sizeof(unsigned int),
 126                 .mode           = 0644,
 127                 .proc_handler   = proc_dointvec_jiffies,
 128         },
 129         { }
 130 };
 131 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 132 #endif /* CONFIG_SYSCTL */
 133
 134 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
 135 {
 136         .l3proto                = PF_UNSPEC,
 137         .l4proto                = 255,
 138         .name                   = "unknown",
 139         .pkt_to_tuple           = generic_pkt_to_tuple,
 140         .invert_tuple           = generic_invert_tuple,
 141         .print_tuple            = generic_print_tuple,
 142         .packet                 = generic_packet,
 143         .get_timeouts           = generic_get_timeouts,
 144         .new                    = generic_new,
 145 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
 146         .ctnl_timeout           = {
 147                 .nlattr_to_obj  = generic_timeout_nlattr_to_obj,
 148                 .obj_to_nlattr  = generic_timeout_obj_to_nlattr,
 149                 .nlattr_max     = CTA_TIMEOUT_GENERIC_MAX,
 150                 .obj_size       = sizeof(unsigned int),
 151                 .nla_policy     = generic_timeout_nla_policy,
 152         },
 153 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
 154 #ifdef CONFIG_SYSCTL
 155         .ctl_table_header       = &generic_sysctl_header,
 156         .ctl_table              = generic_sysctl_table,
 157 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 158         .ctl_compat_table       = generic_compat_sysctl_table,
 159 #endif
 160 #endif
 161 };