a31f1adc09
As gre does not have the srckey in the packet gre_pkt_to_tuple needs to perform a lookup in it's per network namespace tables. Pass in the proper network namespace to all pkt_to_tuple implementations to ensure gre (and any similar protocols) can get this right. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
246 lines
5.9 KiB
C
246 lines
5.9 KiB
C
/* (C) 1999-2001 Paul `Rusty' Russell
|
|
* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/netfilter.h>
|
|
#include <net/netfilter/nf_conntrack_l4proto.h>
|
|
|
|
static unsigned int nf_ct_generic_timeout __read_mostly = 600*HZ;
|
|
|
|
static bool nf_generic_should_process(u8 proto)
|
|
{
|
|
switch (proto) {
|
|
#ifdef CONFIG_NF_CT_PROTO_SCTP_MODULE
|
|
case IPPROTO_SCTP:
|
|
return false;
|
|
#endif
|
|
#ifdef CONFIG_NF_CT_PROTO_DCCP_MODULE
|
|
case IPPROTO_DCCP:
|
|
return false;
|
|
#endif
|
|
#ifdef CONFIG_NF_CT_PROTO_GRE_MODULE
|
|
case IPPROTO_GRE:
|
|
return false;
|
|
#endif
|
|
#ifdef CONFIG_NF_CT_PROTO_UDPLITE_MODULE
|
|
case IPPROTO_UDPLITE:
|
|
return false;
|
|
#endif
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
static inline struct nf_generic_net *generic_pernet(struct net *net)
|
|
{
|
|
return &net->ct.nf_ct_proto.generic;
|
|
}
|
|
|
|
static bool generic_pkt_to_tuple(const struct sk_buff *skb,
|
|
unsigned int dataoff,
|
|
struct net *net, struct nf_conntrack_tuple *tuple)
|
|
{
|
|
tuple->src.u.all = 0;
|
|
tuple->dst.u.all = 0;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
|
|
const struct nf_conntrack_tuple *orig)
|
|
{
|
|
tuple->src.u.all = 0;
|
|
tuple->dst.u.all = 0;
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Print out the per-protocol part of the tuple. */
|
|
static void generic_print_tuple(struct seq_file *s,
|
|
const struct nf_conntrack_tuple *tuple)
|
|
{
|
|
}
|
|
|
|
static unsigned int *generic_get_timeouts(struct net *net)
|
|
{
|
|
return &(generic_pernet(net)->timeout);
|
|
}
|
|
|
|
/* Returns verdict for packet, or -1 for invalid. */
|
|
static int 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)
|
|
{
|
|
nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
|
|
return NF_ACCEPT;
|
|
}
|
|
|
|
/* Called when a new connection for this protocol found. */
|
|
static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
|
|
unsigned int dataoff, unsigned int *timeouts)
|
|
{
|
|
bool ret;
|
|
|
|
ret = nf_generic_should_process(nf_ct_protonum(ct));
|
|
if (!ret)
|
|
pr_warn_once("conntrack: generic helper won't handle protocol %d. Please consider loading the specific helper module.\n",
|
|
nf_ct_protonum(ct));
|
|
return ret;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
|
|
|
|
#include <linux/netfilter/nfnetlink.h>
|
|
#include <linux/netfilter/nfnetlink_cttimeout.h>
|
|
|
|
static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
|
|
struct net *net, void *data)
|
|
{
|
|
unsigned int *timeout = data;
|
|
struct nf_generic_net *gn = generic_pernet(net);
|
|
|
|
if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
|
|
*timeout =
|
|
ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
|
|
else {
|
|
/* Set default generic timeout. */
|
|
*timeout = gn->timeout;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
|
|
{
|
|
const unsigned int *timeout = data;
|
|
|
|
if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
|
|
goto nla_put_failure;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static const struct nla_policy
|
|
generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
|
|
[CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 },
|
|
};
|
|
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static struct ctl_table generic_sysctl_table[] = {
|
|
{
|
|
.procname = "nf_conntrack_generic_timeout",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{ }
|
|
};
|
|
#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
|
|
static struct ctl_table generic_compat_sysctl_table[] = {
|
|
{
|
|
.procname = "ip_conntrack_generic_timeout",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{ }
|
|
};
|
|
#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
|
|
#endif /* CONFIG_SYSCTL */
|
|
|
|
static int generic_kmemdup_sysctl_table(struct nf_proto_net *pn,
|
|
struct nf_generic_net *gn)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
pn->ctl_table = kmemdup(generic_sysctl_table,
|
|
sizeof(generic_sysctl_table),
|
|
GFP_KERNEL);
|
|
if (!pn->ctl_table)
|
|
return -ENOMEM;
|
|
|
|
pn->ctl_table[0].data = &gn->timeout;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int generic_kmemdup_compat_sysctl_table(struct nf_proto_net *pn,
|
|
struct nf_generic_net *gn)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
|
|
pn->ctl_compat_table = kmemdup(generic_compat_sysctl_table,
|
|
sizeof(generic_compat_sysctl_table),
|
|
GFP_KERNEL);
|
|
if (!pn->ctl_compat_table)
|
|
return -ENOMEM;
|
|
|
|
pn->ctl_compat_table[0].data = &gn->timeout;
|
|
#endif
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int generic_init_net(struct net *net, u_int16_t proto)
|
|
{
|
|
int ret;
|
|
struct nf_generic_net *gn = generic_pernet(net);
|
|
struct nf_proto_net *pn = &gn->pn;
|
|
|
|
gn->timeout = nf_ct_generic_timeout;
|
|
|
|
ret = generic_kmemdup_compat_sysctl_table(pn, gn);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = generic_kmemdup_sysctl_table(pn, gn);
|
|
if (ret < 0)
|
|
nf_ct_kfree_compat_sysctl_table(pn);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct nf_proto_net *generic_get_net_proto(struct net *net)
|
|
{
|
|
return &net->ct.nf_ct_proto.generic.pn;
|
|
}
|
|
|
|
struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
|
|
{
|
|
.l3proto = PF_UNSPEC,
|
|
.l4proto = 255,
|
|
.name = "unknown",
|
|
.pkt_to_tuple = generic_pkt_to_tuple,
|
|
.invert_tuple = generic_invert_tuple,
|
|
.print_tuple = generic_print_tuple,
|
|
.packet = generic_packet,
|
|
.get_timeouts = generic_get_timeouts,
|
|
.new = generic_new,
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
|
|
.ctnl_timeout = {
|
|
.nlattr_to_obj = generic_timeout_nlattr_to_obj,
|
|
.obj_to_nlattr = generic_timeout_obj_to_nlattr,
|
|
.nlattr_max = CTA_TIMEOUT_GENERIC_MAX,
|
|
.obj_size = sizeof(unsigned int),
|
|
.nla_policy = generic_timeout_nla_policy,
|
|
},
|
|
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
|
|
.init_net = generic_init_net,
|
|
.get_net_proto = generic_get_net_proto,
|
|
};
|