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[NETFILTER]: nf_nat: add SCTP protocol support

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Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2008-04-14 11:15:50 +02:00
parent 4910a08799
commit 9d908a69a3
4 changed files with 106 additions and 2 deletions
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5
net/ipv4/netfilter/Kconfig
View File

@ -255,6 +255,11 @@ config NF_NAT_PROTO_UDPLITE
depends on NF_NAT && NF_CT_PROTO_UDPLITE
default NF_NAT && NF_CT_PROTO_UDPLITE
config NF_NAT_PROTO_SCTP
tristate
default NF_NAT && NF_CT_PROTO_SCTP
depends on NF_NAT && NF_CT_PROTO_SCTP
config NF_NAT_FTP
tristate
depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT

1
net/ipv4/netfilter/Makefile
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@ -32,6 +32,7 @@ obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
obj-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o
# generic IP tables
obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o

96
net/ipv4/netfilter/nf_nat_proto_sctp.c Normal file
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@ -0,0 +1,96 @@
/*
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
*
* 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/init.h>
#include <linux/ip.h>
#include <linux/sctp.h>
#include <net/sctp/checksum.h>
#include <net/netfilter/nf_nat_protocol.h>
static u_int16_t nf_sctp_port_rover;
static int
sctp_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_range *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
return nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
&nf_sctp_port_rover);
}
static int
sctp_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
sctp_sctphdr_t *hdr;
unsigned int hdroff = iphdroff + iph->ihl*4;
__be32 oldip, newip;
u32 crc32;
if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
return 0;
iph = (struct iphdr *)(skb->data + iphdroff);
hdr = (struct sctphdr *)(skb->data + hdroff);
if (maniptype == IP_NAT_MANIP_SRC) {
/* Get rid of src ip and src pt */
oldip = iph->saddr;
newip = tuple->src.u3.ip;
hdr->source = tuple->src.u.sctp.port;
} else {
/* Get rid of dst ip and dst pt */
oldip = iph->daddr;
newip = tuple->dst.u3.ip;
hdr->dest = tuple->dst.u.sctp.port;
}
crc32 = sctp_start_cksum((u8 *)hdr, skb_headlen(skb) - hdroff);
for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next)
crc32 = sctp_update_cksum((u8 *)skb->data, skb_headlen(skb),
crc32);
crc32 = sctp_end_cksum(crc32);
hdr->checksum = htonl(crc32);
return 1;
}
static const struct nf_nat_protocol nf_nat_protocol_sctp = {
.protonum = IPPROTO_SCTP,
.me = THIS_MODULE,
.manip_pkt = sctp_manip_pkt,
.in_range = nf_nat_proto_in_range,
.unique_tuple = sctp_unique_tuple,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.range_to_nlattr = nf_nat_proto_range_to_nlattr,
.nlattr_to_range = nf_nat_proto_nlattr_to_range,
#endif
};
static int __init nf_nat_proto_sctp_init(void)
{
return nf_nat_protocol_register(&nf_nat_protocol_sctp);
}
static void __exit nf_nat_proto_sctp_exit(void)
{
nf_nat_protocol_unregister(&nf_nat_protocol_sctp);
}
module_init(nf_nat_proto_sctp_init);
module_exit(nf_nat_proto_sctp_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SCTP NAT protocol helper");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");

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

@ -52,7 +52,8 @@ static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
if (t->dst.protonum == IPPROTO_TCP ||
t->dst.protonum == IPPROTO_UDP ||
t->dst.protonum == IPPROTO_UDPLITE ||
t->dst.protonum == IPPROTO_DCCP)
t->dst.protonum == IPPROTO_DCCP ||
t->dst.protonum == IPPROTO_SCTP)
fl->fl_ip_dport = t->dst.u.tcp.port;
}
@ -63,7 +64,8 @@ static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
if (t->dst.protonum == IPPROTO_TCP ||
t->dst.protonum == IPPROTO_UDP ||
t->dst.protonum == IPPROTO_UDPLITE ||
t->dst.protonum == IPPROTO_DCCP)
t->dst.protonum == IPPROTO_DCCP ||
t->dst.protonum == IPPROTO_SCTP)
fl->fl_ip_sport = t->src.u.tcp.port;
}
}