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Release 4.14 net/netfilter/nf_nat_proto_dccp.c

Directory: net/netfilter
 * DCCP NAT protocol helper
 * Copyright (c) 2005, 2006, 2008 Patrick McHardy <>
 * 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/kernel.h>
#include <linux/skbuff.h>
#include <linux/dccp.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>

static u_int16_t dccp_port_rover;

static void dccp_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, &dccp_port_rover); }


Patrick McHardy4795.92%266.67%
Changli Gao24.08%133.33%

static bool dccp_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 dccp_hdr *hdr; __be16 *portptr, oldport, newport; int hdrsize = 8; /* DCCP connection tracking guarantees this much */ if (skb->len >= hdroff + sizeof(struct dccp_hdr)) hdrsize = sizeof(struct dccp_hdr); if (!skb_make_writable(skb, hdroff + hdrsize)) return false; hdr = (struct dccp_hdr *)(skb->data + hdroff); if (maniptype == NF_NAT_MANIP_SRC) { newport = tuple->src.u.dccp.port; portptr = &hdr->dccph_sport; } else { newport = tuple->dst.u.dccp.port; portptr = &hdr->dccph_dport; } oldport = *portptr; *portptr = newport; if (hdrsize < sizeof(*hdr)) return true; l3proto->csum_update(skb, iphdroff, &hdr->dccph_checksum, tuple, maniptype); inet_proto_csum_replace2(&hdr->dccph_checksum, skb, oldport, newport, false); return true; }


Patrick McHardy21097.67%360.00%
Jan Engelhardt41.86%120.00%
Tom Herbert10.47%120.00%

const struct nf_nat_l4proto nf_nat_l4proto_dccp = { .l4proto = IPPROTO_DCCP, .manip_pkt = dccp_manip_pkt, .in_range = nf_nat_l4proto_in_range, .unique_tuple = dccp_unique_tuple, #if IS_ENABLED(CONFIG_NF_CT_NETLINK) .nlattr_to_range = nf_nat_l4proto_nlattr_to_range, #endif };

Overall Contributors

Patrick McHardy32397.58%342.86%
Jan Engelhardt41.21%114.29%
Changli Gao20.60%114.29%
Duan Jiong10.30%114.29%
Tom Herbert10.30%114.29%
Directory: net/netfilter
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