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netfilter: nf_conntrack: generalize nf_ct_l4proto_net 

This patch generalizes nf_ct_l4proto_net by splitting it into chunks and
moving the corresponding protocol part to where it really belongs to.

To clarify, note that we follow two different approaches to support per-net
depending if it's built-in or run-time loadable protocol tracker.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Gao feng <gaofeng@cn.fujitsu.com>
This commit is contained in:
Pablo Neira Ayuso 2012-06-29 05:23:24 +00:00
parent 8fc0278168
commit 08911475d1
7 changed files with 41 additions and 16 deletions
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3
include/net/netfilter/nf_conntrack_l4proto.h
View File

@ -99,6 +99,9 @@ struct nf_conntrack_l4proto {
/* Init l4proto pernet data */
int (*init_net)(struct net *net, u_int16_t proto);
/* Return the per-net protocol part. */
struct nf_proto_net *(*get_net_proto)(struct net *net);
/* Protocol name */
const char *name;

6
net/ipv4/netfilter/nf_conntrack_proto_icmp.c
View File

@ -388,6 +388,11 @@ static int icmp_init_net(struct net *net, u_int16_t proto)
return ret;
}
static struct nf_proto_net *icmp_get_net_proto(struct net *net)
{
return &net->ct.nf_ct_proto.icmp.pn;
}
struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
{
.l3proto = PF_INET,
@ -418,4 +423,5 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
},
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
.init_net = icmp_init_net,
.get_net_proto = icmp_get_net_proto,
};

6
net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
View File

@ -358,6 +358,11 @@ static int icmpv6_init_net(struct net *net, u_int16_t proto)
return icmpv6_kmemdup_sysctl_table(pn, in);
}
static struct nf_proto_net *icmpv6_get_net_proto(struct net *net)
{
return &net->ct.nf_ct_proto.icmpv6.pn;
}
struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
{
.l3proto = PF_INET6,
@ -386,4 +391,5 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly =
},
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
.init_net = icmpv6_init_net,
.get_net_proto = icmpv6_get_net_proto,
};

20
net/netfilter/nf_conntrack_proto.c
View File

@ -303,22 +303,12 @@ EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister);
static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
struct nf_conntrack_l4proto *l4proto)
{
switch (l4proto->l4proto) {
case IPPROTO_TCP:
return (struct nf_proto_net *)&net->ct.nf_ct_proto.tcp;
case IPPROTO_UDP:
return (struct nf_proto_net *)&net->ct.nf_ct_proto.udp;
case IPPROTO_ICMP:
return (struct nf_proto_net *)&net->ct.nf_ct_proto.icmp;
case IPPROTO_ICMPV6:
return (struct nf_proto_net *)&net->ct.nf_ct_proto.icmpv6;
case 255: /* l4proto_generic */
return (struct nf_proto_net *)&net->ct.nf_ct_proto.generic;
default:
if (l4proto->net_id)
if (l4proto->get_net_proto) {
/* statically built-in protocols use static per-net */
return l4proto->get_net_proto(net);
} else if (l4proto->net_id) {
/* ... and loadable protocols use dynamic per-net */
return net_generic(net, *l4proto->net_id);
else
return NULL;
}
return NULL;
}

6
net/netfilter/nf_conntrack_proto_generic.c
View File

@ -186,6 +186,11 @@ static int generic_init_net(struct net *net, u_int16_t proto)
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,
@ -207,4 +212,5 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
},
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
.init_net = generic_init_net,
.get_net_proto = generic_get_net_proto,
};

7
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -1623,6 +1623,11 @@ static int tcp_init_net(struct net *net, u_int16_t proto)
return ret;
}
static struct nf_proto_net *tcp_get_net_proto(struct net *net)
{
return &net->ct.nf_ct_proto.tcp.pn;
}
struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly =
{
.l3proto = PF_INET,
@ -1656,6 +1661,7 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp4 __read_mostly =
},
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
.init_net = tcp_init_net,
.get_net_proto = tcp_get_net_proto,
};
EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp4);
@ -1692,5 +1698,6 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6 __read_mostly =
},
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
.init_net = tcp_init_net,
.get_net_proto = tcp_get_net_proto,
};
EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_tcp6);

7
net/netfilter/nf_conntrack_proto_udp.c
View File

@ -297,6 +297,11 @@ static int udp_init_net(struct net *net, u_int16_t proto)
return ret;
}
static struct nf_proto_net *udp_get_net_proto(struct net *net)
{
return &net->ct.nf_ct_proto.udp.pn;
}
struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly =
{
.l3proto = PF_INET,
@ -325,6 +330,7 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly =
},
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
.init_net = udp_init_net,
.get_net_proto = udp_get_net_proto,
};
EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4);
@ -356,5 +362,6 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly =
},
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
.init_net = udp_init_net,
.get_net_proto = udp_get_net_proto,
};
EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6);