diff options
| -rw-r--r-- | net/ipv4/netfilter/Kconfig | 5 | ||||
| -rw-r--r-- | net/ipv4/netfilter/Makefile | 1 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_udplite.c | 99 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_nat_standalone.c | 6 |
4 files changed, 109 insertions, 2 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig index 9a077cb24798..c5bd2840663b 100644 --- a/net/ipv4/netfilter/Kconfig +++ b/net/ipv4/netfilter/Kconfig @@ -245,6 +245,11 @@ config NF_NAT_PROTO_GRE tristate depends on NF_NAT && NF_CT_PROTO_GRE +config NF_NAT_PROTO_UDPLITE + tristate + depends on NF_NAT && NF_CT_PROTO_UDPLITE + default NF_NAT && NF_CT_PROTO_UDPLITE + config NF_NAT_FTP tristate depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile index e73d0eb9994a..332f46fbc756 100644 --- a/net/ipv4/netfilter/Makefile +++ b/net/ipv4/netfilter/Makefile @@ -30,6 +30,7 @@ obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o # NAT protocols (nf_nat) obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o +obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o # generic IP tables obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o diff --git a/net/ipv4/netfilter/nf_nat_proto_udplite.c b/net/ipv4/netfilter/nf_nat_proto_udplite.c new file mode 100644 index 000000000000..b29346d0e7ab --- /dev/null +++ b/net/ipv4/netfilter/nf_nat_proto_udplite.c @@ -0,0 +1,99 @@ +/* (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> + * (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/udp.h> + +#include <linux/netfilter.h> +#include <net/netfilter/nf_nat.h> +#include <net/netfilter/nf_nat_protocol.h> + +static u_int16_t udplite_port_rover; + +static int +udplite_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, + &udplite_port_rover); +} + +static int +udplite_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); + struct udphdr *hdr; + unsigned int hdroff = iphdroff + iph->ihl*4; + __be32 oldip, newip; + __be16 *portptr, newport; + + if (!skb_make_writable(skb, hdroff + sizeof(*hdr))) + return 0; + + iph = (struct iphdr *)(skb->data + iphdroff); + hdr = (struct udphdr *)(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; + newport = tuple->src.u.udp.port; + portptr = &hdr->source; + } else { + /* Get rid of dst ip and dst pt */ + oldip = iph->daddr; + newip = tuple->dst.u3.ip; + newport = tuple->dst.u.udp.port; + portptr = &hdr->dest; + } + + inet_proto_csum_replace4(&hdr->check, skb, oldip, newip, 1); + inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport, 0); + if (!hdr->check) + hdr->check = CSUM_MANGLED_0; + + *portptr = newport; + return 1; +} + +static const struct nf_nat_protocol nf_nat_protocol_udplite = { + .protonum = IPPROTO_UDPLITE, + .me = THIS_MODULE, + .manip_pkt = udplite_manip_pkt, + .in_range = nf_nat_proto_in_range, + .unique_tuple = udplite_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_udplite_init(void) +{ + return nf_nat_protocol_register(&nf_nat_protocol_udplite); +} + +static void __exit nf_nat_proto_udplite_fini(void) +{ + nf_nat_protocol_unregister(&nf_nat_protocol_udplite); +} + +module_init(nf_nat_proto_udplite_init); +module_exit(nf_nat_proto_udplite_fini); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("UDP-Lite NAT protocol helper"); +MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c index 9fba42d9cdea..dc316b9f9b1d 100644 --- a/net/ipv4/netfilter/nf_nat_standalone.c +++ b/net/ipv4/netfilter/nf_nat_standalone.c @@ -50,7 +50,8 @@ static void nat_decode_session(struct sk_buff *skb, struct flowi *fl) if (ct->status & statusbit) { fl->fl4_dst = t->dst.u3.ip; if (t->dst.protonum == IPPROTO_TCP || - t->dst.protonum == IPPROTO_UDP) + t->dst.protonum == IPPROTO_UDP || + t->dst.protonum == IPPROTO_UDPLITE) fl->fl_ip_dport = t->dst.u.tcp.port; } @@ -59,7 +60,8 @@ static void nat_decode_session(struct sk_buff *skb, struct flowi *fl) if (ct->status & statusbit) { fl->fl4_src = t->src.u3.ip; if (t->dst.protonum == IPPROTO_TCP || - t->dst.protonum == IPPROTO_UDP) + t->dst.protonum == IPPROTO_UDP || + t->dst.protonum == IPPROTO_UDPLITE) fl->fl_ip_sport = t->src.u.tcp.port; } } |