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netfilter: ctnetlink: add full support for SCTP to ctnetlink 

This patch adds full support for SCTP to ctnetlink. This includes three
new attributes: state, original vtag and reply vtag.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pablo Neira Ayuso 2008-06-09 15:56:39 -07:00 committed by David S. Miller
parent 0adf9d6748
commit a258860e01
2 changed files with 90 additions and 0 deletions
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10
include/linux/netfilter/nfnetlink_conntrack.h
View File

@ -81,6 +81,7 @@ enum ctattr_protoinfo {
CTA_PROTOINFO_UNSPEC,
CTA_PROTOINFO_TCP,
CTA_PROTOINFO_DCCP,
CTA_PROTOINFO_SCTP,
__CTA_PROTOINFO_MAX
};
#define CTA_PROTOINFO_MAX (__CTA_PROTOINFO_MAX - 1)
@ -103,6 +104,15 @@ enum ctattr_protoinfo_dccp {
};
#define CTA_PROTOINFO_DCCP_MAX (__CTA_PROTOINFO_DCCP_MAX - 1)
enum ctattr_protoinfo_sctp {
CTA_PROTOINFO_SCTP_UNSPEC,
CTA_PROTOINFO_SCTP_STATE,
CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
CTA_PROTOINFO_SCTP_VTAG_REPLY,
__CTA_PROTOINFO_SCTP_MAX
};
#define CTA_PROTOINFO_SCTP_MAX (__CTA_PROTOINFO_SCTP_MAX - 1)
enum ctattr_counters {
CTA_COUNTERS_UNSPEC,
CTA_COUNTERS_PACKETS, /* old 64bit counters */

80
net/netfilter/nf_conntrack_proto_sctp.c
View File

@ -463,6 +463,82 @@ static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
return true;
}
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
const struct nf_conn *ct)
{
struct nlattr *nest_parms;
read_lock_bh(&sctp_lock);
nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
NLA_PUT_U8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state);
NLA_PUT_BE32(skb,
CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
htonl(ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]));
NLA_PUT_BE32(skb,
CTA_PROTOINFO_SCTP_VTAG_REPLY,
htonl(ct->proto.sctp.vtag[IP_CT_DIR_REPLY]));
read_unlock_bh(&sctp_lock);
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
read_unlock_bh(&sctp_lock);
return -1;
}
static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
[CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 },
[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 },
[CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
};
static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
{
struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
int err;
/* updates may not contain the internal protocol info, skip parsing */
if (!attr)
return 0;
err = nla_parse_nested(tb,
CTA_PROTOINFO_SCTP_MAX,
attr,
sctp_nla_policy);
if (err < 0)
return err;
if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
!tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
!tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
return -EINVAL;
write_lock_bh(&sctp_lock);
ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
ntohl(nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]));
ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
ntohl(nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]));
write_unlock_bh(&sctp_lock);
return 0;
}
#endif
#ifdef CONFIG_SYSCTL
static unsigned int sctp_sysctl_table_users;
static struct ctl_table_header *sctp_sysctl_header;
@ -591,6 +667,8 @@ static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
.new = sctp_new,
.me = THIS_MODULE,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.to_nlattr = sctp_to_nlattr,
.from_nlattr = nlattr_to_sctp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
.nla_policy = nf_ct_port_nla_policy,
@ -617,6 +695,8 @@ static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
.new = sctp_new,
.me = THIS_MODULE,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.to_nlattr = sctp_to_nlattr,
.from_nlattr = nlattr_to_sctp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
.nla_policy = nf_ct_port_nla_policy,