diff options
Diffstat (limited to 'net/netfilter/nf_nat_proto_udp.c')
-rw-r--r-- | net/netfilter/nf_nat_proto_udp.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/net/netfilter/nf_nat_proto_udp.c b/net/netfilter/nf_nat_proto_udp.c new file mode 100644 index 000000000..b0ede2f0d --- /dev/null +++ b/net/netfilter/nf_nat_proto_udp.c @@ -0,0 +1,76 @@ +/* (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2006 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/export.h> +#include <linux/init.h> +#include <linux/udp.h> + +#include <linux/netfilter.h> +#include <net/netfilter/nf_nat.h> +#include <net/netfilter/nf_nat_core.h> +#include <net/netfilter/nf_nat_l3proto.h> +#include <net/netfilter/nf_nat_l4proto.h> + +static u16 udp_port_rover; + +static void +udp_unique_tuple(const struct nf_nat_l3proto *l3proto, + struct nf_conntrack_tuple *tuple, + const struct nf_nat_range *range, + enum nf_nat_manip_type maniptype, + const struct nf_conn *ct) +{ + nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct, + &udp_port_rover); +} + +static bool +udp_manip_pkt(struct sk_buff *skb, + const struct nf_nat_l3proto *l3proto, + unsigned int iphdroff, unsigned int hdroff, + const struct nf_conntrack_tuple *tuple, + enum nf_nat_manip_type maniptype) +{ + struct udphdr *hdr; + __be16 *portptr, newport; + + if (!skb_make_writable(skb, hdroff + sizeof(*hdr))) + return false; + hdr = (struct udphdr *)(skb->data + hdroff); + + if (maniptype == NF_NAT_MANIP_SRC) { + /* Get rid of src port */ + newport = tuple->src.u.udp.port; + portptr = &hdr->source; + } else { + /* Get rid of dst port */ + newport = tuple->dst.u.udp.port; + portptr = &hdr->dest; + } + if (hdr->check || skb->ip_summed == CHECKSUM_PARTIAL) { + l3proto->csum_update(skb, iphdroff, &hdr->check, + tuple, maniptype); + inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport, + 0); + if (!hdr->check) + hdr->check = CSUM_MANGLED_0; + } + *portptr = newport; + return true; +} + +const struct nf_nat_l4proto nf_nat_l4proto_udp = { + .l4proto = IPPROTO_UDP, + .manip_pkt = udp_manip_pkt, + .in_range = nf_nat_l4proto_in_range, + .unique_tuple = udp_unique_tuple, +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) + .nlattr_to_range = nf_nat_l4proto_nlattr_to_range, +#endif +}; |