2019-06-04 02:11:33 -06:00
|
|
|
// SPDX-License-Identifier: GPL-2.0-only
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
/* (C) 1999-2001 Paul `Rusty' Russell
|
|
|
|
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/export.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/udp.h>
|
|
|
|
#include <linux/tcp.h>
|
|
|
|
#include <linux/icmp.h>
|
|
|
|
#include <linux/icmpv6.h>
|
|
|
|
|
|
|
|
#include <linux/dccp.h>
|
|
|
|
#include <linux/sctp.h>
|
|
|
|
#include <net/sctp/checksum.h>
|
|
|
|
|
|
|
|
#include <linux/netfilter.h>
|
|
|
|
#include <net/netfilter/nf_nat.h>
|
|
|
|
|
2019-02-19 09:38:21 -07:00
|
|
|
#include <linux/ipv6.h>
|
|
|
|
#include <linux/netfilter_ipv6.h>
|
|
|
|
#include <net/checksum.h>
|
|
|
|
#include <net/ip6_checksum.h>
|
|
|
|
#include <net/ip6_route.h>
|
|
|
|
#include <net/xfrm.h>
|
|
|
|
#include <net/ipv6.h>
|
|
|
|
|
|
|
|
#include <net/netfilter/nf_conntrack_core.h>
|
|
|
|
#include <net/netfilter/nf_conntrack.h>
|
2019-02-19 09:38:22 -07:00
|
|
|
#include <linux/netfilter/nfnetlink_conntrack.h>
|
2019-02-19 09:38:21 -07:00
|
|
|
|
2019-02-19 09:38:24 -07:00
|
|
|
static void nf_csum_update(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, __sum16 *check,
|
|
|
|
const struct nf_conntrack_tuple *t,
|
|
|
|
enum nf_nat_manip_type maniptype);
|
|
|
|
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
static void
|
|
|
|
__udp_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, struct udphdr *hdr,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype, bool do_csum)
|
|
|
|
{
|
|
|
|
__be16 *portptr, newport;
|
|
|
|
|
|
|
|
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 (do_csum) {
|
2019-02-19 09:38:24 -07:00
|
|
|
nf_csum_update(skb, iphdroff, &hdr->check, tuple, maniptype);
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport,
|
|
|
|
false);
|
|
|
|
if (!hdr->check)
|
|
|
|
hdr->check = CSUM_MANGLED_0;
|
|
|
|
}
|
|
|
|
*portptr = newport;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool udp_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
struct udphdr *hdr;
|
|
|
|
bool do_csum;
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdroff + sizeof(*hdr)))
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
hdr = (struct udphdr *)(skb->data + hdroff);
|
|
|
|
do_csum = hdr->check || skb->ip_summed == CHECKSUM_PARTIAL;
|
|
|
|
|
2019-02-19 09:38:24 -07:00
|
|
|
__udp_manip_pkt(skb, iphdroff, hdr, tuple, maniptype, do_csum);
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool udplite_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_NF_CT_PROTO_UDPLITE
|
|
|
|
struct udphdr *hdr;
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdroff + sizeof(*hdr)))
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
hdr = (struct udphdr *)(skb->data + hdroff);
|
2019-02-19 09:38:24 -07:00
|
|
|
__udp_manip_pkt(skb, iphdroff, hdr, tuple, maniptype, true);
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
#endif
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool
|
|
|
|
sctp_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_NF_CT_PROTO_SCTP
|
|
|
|
struct sctphdr *hdr;
|
|
|
|
int hdrsize = 8;
|
|
|
|
|
|
|
|
/* This could be an inner header returned in imcp packet; in such
|
|
|
|
* cases we cannot update the checksum field since it is outside
|
|
|
|
* of the 8 bytes of transport layer headers we are guaranteed.
|
|
|
|
*/
|
|
|
|
if (skb->len >= hdroff + sizeof(*hdr))
|
|
|
|
hdrsize = sizeof(*hdr);
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdroff + hdrsize))
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
hdr = (struct sctphdr *)(skb->data + hdroff);
|
|
|
|
|
|
|
|
if (maniptype == NF_NAT_MANIP_SRC) {
|
|
|
|
/* Get rid of src port */
|
|
|
|
hdr->source = tuple->src.u.sctp.port;
|
|
|
|
} else {
|
|
|
|
/* Get rid of dst port */
|
|
|
|
hdr->dest = tuple->dst.u.sctp.port;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (hdrsize < sizeof(*hdr))
|
|
|
|
return true;
|
|
|
|
|
|
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL) {
|
|
|
|
hdr->checksum = sctp_compute_cksum(skb, hdroff);
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool
|
|
|
|
tcp_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
struct tcphdr *hdr;
|
|
|
|
__be16 *portptr, newport, oldport;
|
|
|
|
int hdrsize = 8; /* TCP connection tracking guarantees this much */
|
|
|
|
|
|
|
|
/* this could be a inner header returned in icmp packet; in such
|
|
|
|
cases we cannot update the checksum field since it is outside of
|
|
|
|
the 8 bytes of transport layer headers we are guaranteed */
|
|
|
|
if (skb->len >= hdroff + sizeof(struct tcphdr))
|
|
|
|
hdrsize = sizeof(struct tcphdr);
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdroff + hdrsize))
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
hdr = (struct tcphdr *)(skb->data + hdroff);
|
|
|
|
|
|
|
|
if (maniptype == NF_NAT_MANIP_SRC) {
|
|
|
|
/* Get rid of src port */
|
|
|
|
newport = tuple->src.u.tcp.port;
|
|
|
|
portptr = &hdr->source;
|
|
|
|
} else {
|
|
|
|
/* Get rid of dst port */
|
|
|
|
newport = tuple->dst.u.tcp.port;
|
|
|
|
portptr = &hdr->dest;
|
|
|
|
}
|
|
|
|
|
|
|
|
oldport = *portptr;
|
|
|
|
*portptr = newport;
|
|
|
|
|
|
|
|
if (hdrsize < sizeof(*hdr))
|
|
|
|
return true;
|
|
|
|
|
2019-02-19 09:38:24 -07:00
|
|
|
nf_csum_update(skb, iphdroff, &hdr->check, tuple, maniptype);
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
inet_proto_csum_replace2(&hdr->check, skb, oldport, newport, false);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool
|
|
|
|
dccp_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_NF_CT_PROTO_DCCP
|
|
|
|
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);
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdroff + hdrsize))
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
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;
|
|
|
|
|
2019-02-19 09:38:24 -07:00
|
|
|
nf_csum_update(skb, iphdroff, &hdr->dccph_checksum, tuple, maniptype);
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
inet_proto_csum_replace2(&hdr->dccph_checksum, skb, oldport, newport,
|
|
|
|
false);
|
|
|
|
#endif
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool
|
|
|
|
icmp_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
struct icmphdr *hdr;
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdroff + sizeof(*hdr)))
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
hdr = (struct icmphdr *)(skb->data + hdroff);
|
|
|
|
inet_proto_csum_replace2(&hdr->checksum, skb,
|
|
|
|
hdr->un.echo.id, tuple->src.u.icmp.id, false);
|
|
|
|
hdr->un.echo.id = tuple->src.u.icmp.id;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool
|
|
|
|
icmpv6_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
struct icmp6hdr *hdr;
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdroff + sizeof(*hdr)))
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
hdr = (struct icmp6hdr *)(skb->data + hdroff);
|
2019-02-19 09:38:24 -07:00
|
|
|
nf_csum_update(skb, iphdroff, &hdr->icmp6_cksum, tuple, maniptype);
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
if (hdr->icmp6_type == ICMPV6_ECHO_REQUEST ||
|
|
|
|
hdr->icmp6_type == ICMPV6_ECHO_REPLY) {
|
|
|
|
inet_proto_csum_replace2(&hdr->icmp6_cksum, skb,
|
|
|
|
hdr->icmp6_identifier,
|
|
|
|
tuple->src.u.icmp.id, false);
|
|
|
|
hdr->icmp6_identifier = tuple->src.u.icmp.id;
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* manipulate a GRE packet according to maniptype */
|
|
|
|
static bool
|
|
|
|
gre_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
#if IS_ENABLED(CONFIG_NF_CT_PROTO_GRE)
|
|
|
|
const struct gre_base_hdr *greh;
|
|
|
|
struct pptp_gre_header *pgreh;
|
|
|
|
|
|
|
|
/* pgreh includes two optional 32bit fields which are not required
|
|
|
|
* to be there. That's where the magic '8' comes from */
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdroff + sizeof(*pgreh) - 8))
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
greh = (void *)skb->data + hdroff;
|
|
|
|
pgreh = (struct pptp_gre_header *)greh;
|
|
|
|
|
|
|
|
/* we only have destination manip of a packet, since 'source key'
|
|
|
|
* is not present in the packet itself */
|
|
|
|
if (maniptype != NF_NAT_MANIP_DST)
|
|
|
|
return true;
|
|
|
|
|
|
|
|
switch (greh->flags & GRE_VERSION) {
|
|
|
|
case GRE_VERSION_0:
|
|
|
|
/* We do not currently NAT any GREv0 packets.
|
|
|
|
* Try to behave like "nf_nat_proto_unknown" */
|
|
|
|
break;
|
|
|
|
case GRE_VERSION_1:
|
|
|
|
pr_debug("call_id -> 0x%04x\n", ntohs(tuple->dst.u.gre.key));
|
|
|
|
pgreh->call_id = tuple->dst.u.gre.key;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
pr_debug("can't nat unknown GRE version\n");
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2019-02-19 09:38:22 -07:00
|
|
|
static bool l4proto_manip_pkt(struct sk_buff *skb,
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
unsigned int iphdroff, unsigned int hdroff,
|
|
|
|
const struct nf_conntrack_tuple *tuple,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
switch (tuple->dst.protonum) {
|
|
|
|
case IPPROTO_TCP:
|
2019-02-19 09:38:24 -07:00
|
|
|
return tcp_manip_pkt(skb, iphdroff, hdroff,
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
tuple, maniptype);
|
|
|
|
case IPPROTO_UDP:
|
2019-02-19 09:38:24 -07:00
|
|
|
return udp_manip_pkt(skb, iphdroff, hdroff,
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
tuple, maniptype);
|
|
|
|
case IPPROTO_UDPLITE:
|
2019-02-19 09:38:24 -07:00
|
|
|
return udplite_manip_pkt(skb, iphdroff, hdroff,
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
tuple, maniptype);
|
|
|
|
case IPPROTO_SCTP:
|
2019-02-19 09:38:24 -07:00
|
|
|
return sctp_manip_pkt(skb, iphdroff, hdroff,
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
tuple, maniptype);
|
|
|
|
case IPPROTO_ICMP:
|
2019-02-19 09:38:24 -07:00
|
|
|
return icmp_manip_pkt(skb, iphdroff, hdroff,
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
tuple, maniptype);
|
|
|
|
case IPPROTO_ICMPV6:
|
2019-02-19 09:38:24 -07:00
|
|
|
return icmpv6_manip_pkt(skb, iphdroff, hdroff,
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
tuple, maniptype);
|
|
|
|
case IPPROTO_DCCP:
|
2019-02-19 09:38:24 -07:00
|
|
|
return dccp_manip_pkt(skb, iphdroff, hdroff,
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
tuple, maniptype);
|
|
|
|
case IPPROTO_GRE:
|
2019-02-19 09:38:24 -07:00
|
|
|
return gre_manip_pkt(skb, iphdroff, hdroff,
|
netfilter: nat: remove l4proto->manip_pkt
This removes the last l4proto indirection, the two callers, the l3proto
packet mangling helpers for ipv4 and ipv6, now call the
nf_nat_l4proto_manip_pkt() helper.
nf_nat_proto_{dccp,tcp,sctp,gre,icmp,icmpv6} are left behind, even though
they contain no functionality anymore to not clutter this patch.
Next patch will remove the empty files and the nf_nat_l4proto
struct.
nf_nat_proto_udp.c is renamed to nf_nat_proto.c, as it now contains the
other nat manip functionality as well, not just udp and udplite.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-12-13 08:01:33 -07:00
|
|
|
tuple, maniptype);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* If we don't know protocol -- no error, pass it unmodified. */
|
|
|
|
return true;
|
|
|
|
}
|
2019-02-19 09:38:21 -07:00
|
|
|
|
|
|
|
static bool nf_nat_ipv4_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff,
|
|
|
|
const struct nf_conntrack_tuple *target,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
struct iphdr *iph;
|
|
|
|
unsigned int hdroff;
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, iphdroff + sizeof(*iph)))
|
2019-02-19 09:38:21 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
iph = (void *)skb->data + iphdroff;
|
|
|
|
hdroff = iphdroff + iph->ihl * 4;
|
|
|
|
|
2019-02-19 09:38:24 -07:00
|
|
|
if (!l4proto_manip_pkt(skb, iphdroff, hdroff, target, maniptype))
|
2019-02-19 09:38:21 -07:00
|
|
|
return false;
|
|
|
|
iph = (void *)skb->data + iphdroff;
|
|
|
|
|
|
|
|
if (maniptype == NF_NAT_MANIP_SRC) {
|
|
|
|
csum_replace4(&iph->check, iph->saddr, target->src.u3.ip);
|
|
|
|
iph->saddr = target->src.u3.ip;
|
|
|
|
} else {
|
|
|
|
csum_replace4(&iph->check, iph->daddr, target->dst.u3.ip);
|
|
|
|
iph->daddr = target->dst.u3.ip;
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool nf_nat_ipv6_manip_pkt(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff,
|
|
|
|
const struct nf_conntrack_tuple *target,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
struct ipv6hdr *ipv6h;
|
|
|
|
__be16 frag_off;
|
|
|
|
int hdroff;
|
|
|
|
u8 nexthdr;
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, iphdroff + sizeof(*ipv6h)))
|
2019-02-19 09:38:21 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
ipv6h = (void *)skb->data + iphdroff;
|
|
|
|
nexthdr = ipv6h->nexthdr;
|
|
|
|
hdroff = ipv6_skip_exthdr(skb, iphdroff + sizeof(*ipv6h),
|
|
|
|
&nexthdr, &frag_off);
|
|
|
|
if (hdroff < 0)
|
|
|
|
goto manip_addr;
|
|
|
|
|
|
|
|
if ((frag_off & htons(~0x7)) == 0 &&
|
2019-02-19 09:38:24 -07:00
|
|
|
!l4proto_manip_pkt(skb, iphdroff, hdroff, target, maniptype))
|
2019-02-19 09:38:21 -07:00
|
|
|
return false;
|
|
|
|
|
|
|
|
/* must reload, offset might have changed */
|
|
|
|
ipv6h = (void *)skb->data + iphdroff;
|
|
|
|
|
|
|
|
manip_addr:
|
|
|
|
if (maniptype == NF_NAT_MANIP_SRC)
|
|
|
|
ipv6h->saddr = target->src.u3.in6;
|
|
|
|
else
|
|
|
|
ipv6h->daddr = target->dst.u3.in6;
|
|
|
|
|
|
|
|
#endif
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2019-02-19 09:38:23 -07:00
|
|
|
unsigned int nf_nat_manip_pkt(struct sk_buff *skb, struct nf_conn *ct,
|
|
|
|
enum nf_nat_manip_type mtype,
|
|
|
|
enum ip_conntrack_dir dir)
|
|
|
|
{
|
|
|
|
struct nf_conntrack_tuple target;
|
|
|
|
|
|
|
|
/* We are aiming to look like inverse of other direction. */
|
|
|
|
nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
|
|
|
|
|
|
|
|
switch (target.src.l3num) {
|
|
|
|
case NFPROTO_IPV6:
|
|
|
|
if (nf_nat_ipv6_manip_pkt(skb, 0, &target, mtype))
|
|
|
|
return NF_ACCEPT;
|
|
|
|
break;
|
|
|
|
case NFPROTO_IPV4:
|
|
|
|
if (nf_nat_ipv4_manip_pkt(skb, 0, &target, mtype))
|
|
|
|
return NF_ACCEPT;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
WARN_ON_ONCE(1);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return NF_DROP;
|
|
|
|
}
|
|
|
|
|
2019-02-19 09:38:21 -07:00
|
|
|
static void nf_nat_ipv4_csum_update(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, __sum16 *check,
|
|
|
|
const struct nf_conntrack_tuple *t,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
|
|
|
|
__be32 oldip, newip;
|
|
|
|
|
|
|
|
if (maniptype == NF_NAT_MANIP_SRC) {
|
|
|
|
oldip = iph->saddr;
|
|
|
|
newip = t->src.u3.ip;
|
|
|
|
} else {
|
|
|
|
oldip = iph->daddr;
|
|
|
|
newip = t->dst.u3.ip;
|
|
|
|
}
|
|
|
|
inet_proto_csum_replace4(check, skb, oldip, newip, true);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nf_nat_ipv6_csum_update(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, __sum16 *check,
|
|
|
|
const struct nf_conntrack_tuple *t,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
const struct ipv6hdr *ipv6h = (struct ipv6hdr *)(skb->data + iphdroff);
|
|
|
|
const struct in6_addr *oldip, *newip;
|
|
|
|
|
|
|
|
if (maniptype == NF_NAT_MANIP_SRC) {
|
|
|
|
oldip = &ipv6h->saddr;
|
|
|
|
newip = &t->src.u3.in6;
|
|
|
|
} else {
|
|
|
|
oldip = &ipv6h->daddr;
|
|
|
|
newip = &t->dst.u3.in6;
|
|
|
|
}
|
|
|
|
inet_proto_csum_replace16(check, skb, oldip->s6_addr32,
|
|
|
|
newip->s6_addr32, true);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2019-02-19 09:38:24 -07:00
|
|
|
static void nf_csum_update(struct sk_buff *skb,
|
|
|
|
unsigned int iphdroff, __sum16 *check,
|
|
|
|
const struct nf_conntrack_tuple *t,
|
|
|
|
enum nf_nat_manip_type maniptype)
|
|
|
|
{
|
|
|
|
switch (t->src.l3num) {
|
|
|
|
case NFPROTO_IPV4:
|
|
|
|
nf_nat_ipv4_csum_update(skb, iphdroff, check, t, maniptype);
|
|
|
|
return;
|
|
|
|
case NFPROTO_IPV6:
|
|
|
|
nf_nat_ipv6_csum_update(skb, iphdroff, check, t, maniptype);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-02-19 09:38:21 -07:00
|
|
|
static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb,
|
|
|
|
u8 proto, void *data, __sum16 *check,
|
|
|
|
int datalen, int oldlen)
|
|
|
|
{
|
|
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL) {
|
|
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
|
|
|
|
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
|
|
skb->csum_start = skb_headroom(skb) + skb_network_offset(skb) +
|
|
|
|
ip_hdrlen(skb);
|
|
|
|
skb->csum_offset = (void *)check - data;
|
|
|
|
*check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, datalen,
|
|
|
|
proto, 0);
|
|
|
|
} else {
|
|
|
|
inet_proto_csum_replace2(check, skb,
|
|
|
|
htons(oldlen), htons(datalen), true);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
static void nf_nat_ipv6_csum_recalc(struct sk_buff *skb,
|
|
|
|
u8 proto, void *data, __sum16 *check,
|
|
|
|
int datalen, int oldlen)
|
|
|
|
{
|
|
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL) {
|
|
|
|
const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
|
|
|
|
|
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
|
|
skb->csum_start = skb_headroom(skb) + skb_network_offset(skb) +
|
|
|
|
(data - (void *)skb->data);
|
|
|
|
skb->csum_offset = (void *)check - data;
|
|
|
|
*check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr,
|
|
|
|
datalen, proto, 0);
|
|
|
|
} else {
|
|
|
|
inet_proto_csum_replace2(check, skb,
|
|
|
|
htons(oldlen), htons(datalen), true);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2019-02-19 09:38:25 -07:00
|
|
|
void nf_nat_csum_recalc(struct sk_buff *skb,
|
|
|
|
u8 nfproto, u8 proto, void *data, __sum16 *check,
|
|
|
|
int datalen, int oldlen)
|
|
|
|
{
|
|
|
|
switch (nfproto) {
|
|
|
|
case NFPROTO_IPV4:
|
|
|
|
nf_nat_ipv4_csum_recalc(skb, proto, data, check,
|
|
|
|
datalen, oldlen);
|
|
|
|
return;
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
case NFPROTO_IPV6:
|
|
|
|
nf_nat_ipv6_csum_recalc(skb, proto, data, check,
|
|
|
|
datalen, oldlen);
|
|
|
|
return;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
WARN_ON_ONCE(1);
|
|
|
|
}
|
|
|
|
|
2019-02-19 09:38:21 -07:00
|
|
|
int nf_nat_icmp_reply_translation(struct sk_buff *skb,
|
|
|
|
struct nf_conn *ct,
|
|
|
|
enum ip_conntrack_info ctinfo,
|
|
|
|
unsigned int hooknum)
|
|
|
|
{
|
|
|
|
struct {
|
|
|
|
struct icmphdr icmp;
|
|
|
|
struct iphdr ip;
|
|
|
|
} *inside;
|
|
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
|
|
enum nf_nat_manip_type manip = HOOK2MANIP(hooknum);
|
|
|
|
unsigned int hdrlen = ip_hdrlen(skb);
|
|
|
|
struct nf_conntrack_tuple target;
|
|
|
|
unsigned long statusbit;
|
|
|
|
|
|
|
|
WARN_ON(ctinfo != IP_CT_RELATED && ctinfo != IP_CT_RELATED_REPLY);
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdrlen + sizeof(*inside)))
|
2019-02-19 09:38:21 -07:00
|
|
|
return 0;
|
2019-06-23 21:17:38 -06:00
|
|
|
if (nf_ip_checksum(skb, hooknum, hdrlen, IPPROTO_ICMP))
|
2019-02-19 09:38:21 -07:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
inside = (void *)skb->data + hdrlen;
|
|
|
|
if (inside->icmp.type == ICMP_REDIRECT) {
|
|
|
|
if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
|
|
|
|
return 0;
|
|
|
|
if (ct->status & IPS_NAT_MASK)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (manip == NF_NAT_MANIP_SRC)
|
|
|
|
statusbit = IPS_SRC_NAT;
|
|
|
|
else
|
|
|
|
statusbit = IPS_DST_NAT;
|
|
|
|
|
|
|
|
/* Invert if this is reply direction */
|
|
|
|
if (dir == IP_CT_DIR_REPLY)
|
|
|
|
statusbit ^= IPS_NAT_MASK;
|
|
|
|
|
|
|
|
if (!(ct->status & statusbit))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
if (!nf_nat_ipv4_manip_pkt(skb, hdrlen + sizeof(inside->icmp),
|
|
|
|
&ct->tuplehash[!dir].tuple, !manip))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL) {
|
|
|
|
/* Reloading "inside" here since manip_pkt may reallocate */
|
|
|
|
inside = (void *)skb->data + hdrlen;
|
|
|
|
inside->icmp.checksum = 0;
|
|
|
|
inside->icmp.checksum =
|
|
|
|
csum_fold(skb_checksum(skb, hdrlen,
|
|
|
|
skb->len - hdrlen, 0));
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Change outer to look like the reply to an incoming packet */
|
|
|
|
nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
|
|
|
|
target.dst.protonum = IPPROTO_ICMP;
|
|
|
|
if (!nf_nat_ipv4_manip_pkt(skb, 0, &target, manip))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation);
|
|
|
|
|
|
|
|
static unsigned int
|
|
|
|
nf_nat_ipv4_fn(void *priv, struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
|
|
|
struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
|
|
if (!ct)
|
|
|
|
return NF_ACCEPT;
|
|
|
|
|
|
|
|
if (ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY) {
|
|
|
|
if (ip_hdr(skb)->protocol == IPPROTO_ICMP) {
|
|
|
|
if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
|
|
|
|
state->hook))
|
|
|
|
return NF_DROP;
|
|
|
|
else
|
|
|
|
return NF_ACCEPT;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return nf_nat_inet_fn(priv, skb, state);
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int
|
|
|
|
nf_nat_ipv4_in(void *priv, struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
|
|
|
unsigned int ret;
|
|
|
|
__be32 daddr = ip_hdr(skb)->daddr;
|
|
|
|
|
|
|
|
ret = nf_nat_ipv4_fn(priv, skb, state);
|
|
|
|
if (ret == NF_ACCEPT && daddr != ip_hdr(skb)->daddr)
|
|
|
|
skb_dst_drop(skb);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int
|
|
|
|
nf_nat_ipv4_out(void *priv, struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
const struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
int err;
|
|
|
|
#endif
|
|
|
|
unsigned int ret;
|
|
|
|
|
|
|
|
ret = nf_nat_ipv4_fn(priv, skb, state);
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
if (ret != NF_ACCEPT)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
|
|
if (ct) {
|
|
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
|
|
|
|
|
|
if (ct->tuplehash[dir].tuple.src.u3.ip !=
|
|
|
|
ct->tuplehash[!dir].tuple.dst.u3.ip ||
|
|
|
|
(ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
|
|
|
|
ct->tuplehash[dir].tuple.src.u.all !=
|
|
|
|
ct->tuplehash[!dir].tuple.dst.u.all)) {
|
|
|
|
err = nf_xfrm_me_harder(state->net, skb, AF_INET);
|
|
|
|
if (err < 0)
|
|
|
|
ret = NF_DROP_ERR(err);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int
|
|
|
|
nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
|
|
|
const struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
unsigned int ret;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
ret = nf_nat_ipv4_fn(priv, skb, state);
|
|
|
|
if (ret != NF_ACCEPT)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
|
|
if (ct) {
|
|
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
|
|
|
|
|
|
if (ct->tuplehash[dir].tuple.dst.u3.ip !=
|
|
|
|
ct->tuplehash[!dir].tuple.src.u3.ip) {
|
|
|
|
err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
|
|
|
|
if (err < 0)
|
|
|
|
ret = NF_DROP_ERR(err);
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
else if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
|
|
|
|
ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
|
|
|
|
ct->tuplehash[dir].tuple.dst.u.all !=
|
|
|
|
ct->tuplehash[!dir].tuple.src.u.all) {
|
|
|
|
err = nf_xfrm_me_harder(state->net, skb, AF_INET);
|
|
|
|
if (err < 0)
|
|
|
|
ret = NF_DROP_ERR(err);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2019-03-27 02:22:24 -06:00
|
|
|
const struct nf_hook_ops nf_nat_ipv4_ops[] = {
|
2019-02-19 09:38:21 -07:00
|
|
|
/* Before packet filtering, change destination */
|
|
|
|
{
|
|
|
|
.hook = nf_nat_ipv4_in,
|
|
|
|
.pf = NFPROTO_IPV4,
|
|
|
|
.hooknum = NF_INET_PRE_ROUTING,
|
|
|
|
.priority = NF_IP_PRI_NAT_DST,
|
|
|
|
},
|
|
|
|
/* After packet filtering, change source */
|
|
|
|
{
|
|
|
|
.hook = nf_nat_ipv4_out,
|
|
|
|
.pf = NFPROTO_IPV4,
|
|
|
|
.hooknum = NF_INET_POST_ROUTING,
|
|
|
|
.priority = NF_IP_PRI_NAT_SRC,
|
|
|
|
},
|
|
|
|
/* Before packet filtering, change destination */
|
|
|
|
{
|
|
|
|
.hook = nf_nat_ipv4_local_fn,
|
|
|
|
.pf = NFPROTO_IPV4,
|
|
|
|
.hooknum = NF_INET_LOCAL_OUT,
|
|
|
|
.priority = NF_IP_PRI_NAT_DST,
|
|
|
|
},
|
|
|
|
/* After packet filtering, change source */
|
|
|
|
{
|
|
|
|
.hook = nf_nat_ipv4_fn,
|
|
|
|
.pf = NFPROTO_IPV4,
|
|
|
|
.hooknum = NF_INET_LOCAL_IN,
|
|
|
|
.priority = NF_IP_PRI_NAT_SRC,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2019-02-19 09:38:27 -07:00
|
|
|
int nf_nat_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops)
|
2019-02-19 09:38:21 -07:00
|
|
|
{
|
2019-03-27 02:22:24 -06:00
|
|
|
return nf_nat_register_fn(net, ops->pf, ops, nf_nat_ipv4_ops,
|
|
|
|
ARRAY_SIZE(nf_nat_ipv4_ops));
|
2019-02-19 09:38:21 -07:00
|
|
|
}
|
2019-02-19 09:38:27 -07:00
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_ipv4_register_fn);
|
2019-02-19 09:38:21 -07:00
|
|
|
|
2019-02-19 09:38:27 -07:00
|
|
|
void nf_nat_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops)
|
2019-02-19 09:38:21 -07:00
|
|
|
{
|
2019-03-27 02:22:24 -06:00
|
|
|
nf_nat_unregister_fn(net, ops->pf, ops, ARRAY_SIZE(nf_nat_ipv4_ops));
|
2019-02-19 09:38:21 -07:00
|
|
|
}
|
2019-02-19 09:38:27 -07:00
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_ipv4_unregister_fn);
|
2019-02-19 09:38:21 -07:00
|
|
|
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
int nf_nat_icmpv6_reply_translation(struct sk_buff *skb,
|
|
|
|
struct nf_conn *ct,
|
|
|
|
enum ip_conntrack_info ctinfo,
|
|
|
|
unsigned int hooknum,
|
|
|
|
unsigned int hdrlen)
|
|
|
|
{
|
|
|
|
struct {
|
|
|
|
struct icmp6hdr icmp6;
|
|
|
|
struct ipv6hdr ip6;
|
|
|
|
} *inside;
|
|
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
|
|
enum nf_nat_manip_type manip = HOOK2MANIP(hooknum);
|
|
|
|
struct nf_conntrack_tuple target;
|
|
|
|
unsigned long statusbit;
|
|
|
|
|
|
|
|
WARN_ON(ctinfo != IP_CT_RELATED && ctinfo != IP_CT_RELATED_REPLY);
|
|
|
|
|
2019-05-23 07:44:07 -06:00
|
|
|
if (skb_ensure_writable(skb, hdrlen + sizeof(*inside)))
|
2019-02-19 09:38:21 -07:00
|
|
|
return 0;
|
|
|
|
if (nf_ip6_checksum(skb, hooknum, hdrlen, IPPROTO_ICMPV6))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
inside = (void *)skb->data + hdrlen;
|
|
|
|
if (inside->icmp6.icmp6_type == NDISC_REDIRECT) {
|
|
|
|
if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
|
|
|
|
return 0;
|
|
|
|
if (ct->status & IPS_NAT_MASK)
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (manip == NF_NAT_MANIP_SRC)
|
|
|
|
statusbit = IPS_SRC_NAT;
|
|
|
|
else
|
|
|
|
statusbit = IPS_DST_NAT;
|
|
|
|
|
|
|
|
/* Invert if this is reply direction */
|
|
|
|
if (dir == IP_CT_DIR_REPLY)
|
|
|
|
statusbit ^= IPS_NAT_MASK;
|
|
|
|
|
|
|
|
if (!(ct->status & statusbit))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
if (!nf_nat_ipv6_manip_pkt(skb, hdrlen + sizeof(inside->icmp6),
|
|
|
|
&ct->tuplehash[!dir].tuple, !manip))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL) {
|
|
|
|
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
|
|
|
|
|
|
|
inside = (void *)skb->data + hdrlen;
|
|
|
|
inside->icmp6.icmp6_cksum = 0;
|
|
|
|
inside->icmp6.icmp6_cksum =
|
|
|
|
csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr,
|
|
|
|
skb->len - hdrlen, IPPROTO_ICMPV6,
|
|
|
|
skb_checksum(skb, hdrlen,
|
|
|
|
skb->len - hdrlen, 0));
|
|
|
|
}
|
|
|
|
|
|
|
|
nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
|
|
|
|
target.dst.protonum = IPPROTO_ICMPV6;
|
|
|
|
if (!nf_nat_ipv6_manip_pkt(skb, 0, &target, manip))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_icmpv6_reply_translation);
|
|
|
|
|
|
|
|
static unsigned int
|
|
|
|
nf_nat_ipv6_fn(void *priv, struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
|
|
|
struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
__be16 frag_off;
|
|
|
|
int hdrlen;
|
|
|
|
u8 nexthdr;
|
|
|
|
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
|
|
/* Can't track? It's not due to stress, or conntrack would
|
|
|
|
* have dropped it. Hence it's the user's responsibilty to
|
|
|
|
* packet filter it out, or implement conntrack/NAT for that
|
|
|
|
* protocol. 8) --RR
|
|
|
|
*/
|
|
|
|
if (!ct)
|
|
|
|
return NF_ACCEPT;
|
|
|
|
|
|
|
|
if (ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY) {
|
|
|
|
nexthdr = ipv6_hdr(skb)->nexthdr;
|
|
|
|
hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
|
|
|
|
&nexthdr, &frag_off);
|
|
|
|
|
|
|
|
if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
|
|
|
|
if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
|
|
|
|
state->hook,
|
|
|
|
hdrlen))
|
|
|
|
return NF_DROP;
|
|
|
|
else
|
|
|
|
return NF_ACCEPT;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return nf_nat_inet_fn(priv, skb, state);
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int
|
|
|
|
nf_nat_ipv6_in(void *priv, struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
|
|
|
unsigned int ret;
|
|
|
|
struct in6_addr daddr = ipv6_hdr(skb)->daddr;
|
|
|
|
|
|
|
|
ret = nf_nat_ipv6_fn(priv, skb, state);
|
|
|
|
if (ret != NF_DROP && ret != NF_STOLEN &&
|
|
|
|
ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
|
|
|
|
skb_dst_drop(skb);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int
|
|
|
|
nf_nat_ipv6_out(void *priv, struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
const struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
int err;
|
|
|
|
#endif
|
|
|
|
unsigned int ret;
|
|
|
|
|
|
|
|
ret = nf_nat_ipv6_fn(priv, skb, state);
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
if (ret != NF_ACCEPT)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
if (IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
|
|
|
|
return ret;
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
|
|
if (ct) {
|
|
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
|
|
|
|
|
|
if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
|
|
|
|
&ct->tuplehash[!dir].tuple.dst.u3) ||
|
|
|
|
(ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
|
|
|
|
ct->tuplehash[dir].tuple.src.u.all !=
|
|
|
|
ct->tuplehash[!dir].tuple.dst.u.all)) {
|
|
|
|
err = nf_xfrm_me_harder(state->net, skb, AF_INET6);
|
|
|
|
if (err < 0)
|
|
|
|
ret = NF_DROP_ERR(err);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int
|
|
|
|
nf_nat_ipv6_local_fn(void *priv, struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
|
|
|
const struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
unsigned int ret;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
ret = nf_nat_ipv6_fn(priv, skb, state);
|
|
|
|
if (ret != NF_ACCEPT)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
|
|
if (ct) {
|
|
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
|
|
|
|
|
|
if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
|
|
|
|
&ct->tuplehash[!dir].tuple.src.u3)) {
|
2019-03-27 02:22:25 -06:00
|
|
|
err = nf_ip6_route_me_harder(state->net, skb);
|
2019-02-19 09:38:21 -07:00
|
|
|
if (err < 0)
|
|
|
|
ret = NF_DROP_ERR(err);
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_XFRM
|
|
|
|
else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
|
|
|
|
ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
|
|
|
|
ct->tuplehash[dir].tuple.dst.u.all !=
|
|
|
|
ct->tuplehash[!dir].tuple.src.u.all) {
|
|
|
|
err = nf_xfrm_me_harder(state->net, skb, AF_INET6);
|
|
|
|
if (err < 0)
|
|
|
|
ret = NF_DROP_ERR(err);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2019-03-27 02:22:24 -06:00
|
|
|
const struct nf_hook_ops nf_nat_ipv6_ops[] = {
|
2019-02-19 09:38:21 -07:00
|
|
|
/* Before packet filtering, change destination */
|
|
|
|
{
|
|
|
|
.hook = nf_nat_ipv6_in,
|
|
|
|
.pf = NFPROTO_IPV6,
|
|
|
|
.hooknum = NF_INET_PRE_ROUTING,
|
|
|
|
.priority = NF_IP6_PRI_NAT_DST,
|
|
|
|
},
|
|
|
|
/* After packet filtering, change source */
|
|
|
|
{
|
|
|
|
.hook = nf_nat_ipv6_out,
|
|
|
|
.pf = NFPROTO_IPV6,
|
|
|
|
.hooknum = NF_INET_POST_ROUTING,
|
|
|
|
.priority = NF_IP6_PRI_NAT_SRC,
|
|
|
|
},
|
|
|
|
/* Before packet filtering, change destination */
|
|
|
|
{
|
|
|
|
.hook = nf_nat_ipv6_local_fn,
|
|
|
|
.pf = NFPROTO_IPV6,
|
|
|
|
.hooknum = NF_INET_LOCAL_OUT,
|
|
|
|
.priority = NF_IP6_PRI_NAT_DST,
|
|
|
|
},
|
|
|
|
/* After packet filtering, change source */
|
|
|
|
{
|
|
|
|
.hook = nf_nat_ipv6_fn,
|
|
|
|
.pf = NFPROTO_IPV6,
|
|
|
|
.hooknum = NF_INET_LOCAL_IN,
|
|
|
|
.priority = NF_IP6_PRI_NAT_SRC,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2019-02-19 09:38:27 -07:00
|
|
|
int nf_nat_ipv6_register_fn(struct net *net, const struct nf_hook_ops *ops)
|
2019-02-19 09:38:21 -07:00
|
|
|
{
|
2019-03-27 02:22:24 -06:00
|
|
|
return nf_nat_register_fn(net, ops->pf, ops, nf_nat_ipv6_ops,
|
2019-02-19 09:38:21 -07:00
|
|
|
ARRAY_SIZE(nf_nat_ipv6_ops));
|
|
|
|
}
|
2019-02-19 09:38:27 -07:00
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_ipv6_register_fn);
|
2019-02-19 09:38:21 -07:00
|
|
|
|
2019-02-19 09:38:27 -07:00
|
|
|
void nf_nat_ipv6_unregister_fn(struct net *net, const struct nf_hook_ops *ops)
|
2019-02-19 09:38:21 -07:00
|
|
|
{
|
2019-03-27 02:22:24 -06:00
|
|
|
nf_nat_unregister_fn(net, ops->pf, ops, ARRAY_SIZE(nf_nat_ipv6_ops));
|
2019-02-19 09:38:21 -07:00
|
|
|
}
|
2019-02-19 09:38:27 -07:00
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_ipv6_unregister_fn);
|
2019-02-19 09:38:21 -07:00
|
|
|
#endif /* CONFIG_IPV6 */
|
2019-03-27 02:22:24 -06:00
|
|
|
|
|
|
|
#if defined(CONFIG_NF_TABLES_INET) && IS_ENABLED(CONFIG_NFT_NAT)
|
|
|
|
int nf_nat_inet_register_fn(struct net *net, const struct nf_hook_ops *ops)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (WARN_ON_ONCE(ops->pf != NFPROTO_INET))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ret = nf_nat_register_fn(net, NFPROTO_IPV6, ops, nf_nat_ipv6_ops,
|
|
|
|
ARRAY_SIZE(nf_nat_ipv6_ops));
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
ret = nf_nat_register_fn(net, NFPROTO_IPV4, ops, nf_nat_ipv4_ops,
|
|
|
|
ARRAY_SIZE(nf_nat_ipv4_ops));
|
|
|
|
if (ret)
|
|
|
|
nf_nat_ipv6_unregister_fn(net, ops);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_inet_register_fn);
|
|
|
|
|
|
|
|
void nf_nat_inet_unregister_fn(struct net *net, const struct nf_hook_ops *ops)
|
|
|
|
{
|
|
|
|
nf_nat_unregister_fn(net, NFPROTO_IPV4, ops, ARRAY_SIZE(nf_nat_ipv4_ops));
|
|
|
|
nf_nat_unregister_fn(net, NFPROTO_IPV6, ops, ARRAY_SIZE(nf_nat_ipv6_ops));
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_nat_inet_unregister_fn);
|
|
|
|
#endif /* NFT INET NAT */
|