mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-19 18:09:05 +00:00
9d28026b7e
->print and ->print_range are not used (and apparently never were). Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
151 lines
4 KiB
C
151 lines
4 KiB
C
/* (C) 1999-2001 Paul `Rusty' Russell
|
|
* (C) 2002-2004 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/init.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/tcp.h>
|
|
#include <linux/if.h>
|
|
#include <linux/netfilter/nfnetlink_conntrack.h>
|
|
#include <linux/netfilter_ipv4/ip_nat.h>
|
|
#include <linux/netfilter_ipv4/ip_nat_rule.h>
|
|
#include <linux/netfilter_ipv4/ip_nat_protocol.h>
|
|
#include <linux/netfilter_ipv4/ip_nat_core.h>
|
|
|
|
static int
|
|
tcp_in_range(const struct ip_conntrack_tuple *tuple,
|
|
enum ip_nat_manip_type maniptype,
|
|
const union ip_conntrack_manip_proto *min,
|
|
const union ip_conntrack_manip_proto *max)
|
|
{
|
|
u_int16_t port;
|
|
|
|
if (maniptype == IP_NAT_MANIP_SRC)
|
|
port = tuple->src.u.tcp.port;
|
|
else
|
|
port = tuple->dst.u.tcp.port;
|
|
|
|
return ntohs(port) >= ntohs(min->tcp.port)
|
|
&& ntohs(port) <= ntohs(max->tcp.port);
|
|
}
|
|
|
|
static int
|
|
tcp_unique_tuple(struct ip_conntrack_tuple *tuple,
|
|
const struct ip_nat_range *range,
|
|
enum ip_nat_manip_type maniptype,
|
|
const struct ip_conntrack *conntrack)
|
|
{
|
|
static u_int16_t port;
|
|
u_int16_t *portptr;
|
|
unsigned int range_size, min, i;
|
|
|
|
if (maniptype == IP_NAT_MANIP_SRC)
|
|
portptr = &tuple->src.u.tcp.port;
|
|
else
|
|
portptr = &tuple->dst.u.tcp.port;
|
|
|
|
/* If no range specified... */
|
|
if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
|
|
/* If it's dst rewrite, can't change port */
|
|
if (maniptype == IP_NAT_MANIP_DST)
|
|
return 0;
|
|
|
|
/* Map privileged onto privileged. */
|
|
if (ntohs(*portptr) < 1024) {
|
|
/* Loose convention: >> 512 is credential passing */
|
|
if (ntohs(*portptr)<512) {
|
|
min = 1;
|
|
range_size = 511 - min + 1;
|
|
} else {
|
|
min = 600;
|
|
range_size = 1023 - min + 1;
|
|
}
|
|
} else {
|
|
min = 1024;
|
|
range_size = 65535 - 1024 + 1;
|
|
}
|
|
} else {
|
|
min = ntohs(range->min.tcp.port);
|
|
range_size = ntohs(range->max.tcp.port) - min + 1;
|
|
}
|
|
|
|
for (i = 0; i < range_size; i++, port++) {
|
|
*portptr = htons(min + port % range_size);
|
|
if (!ip_nat_used_tuple(tuple, conntrack)) {
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tcp_manip_pkt(struct sk_buff **pskb,
|
|
unsigned int iphdroff,
|
|
const struct ip_conntrack_tuple *tuple,
|
|
enum ip_nat_manip_type maniptype)
|
|
{
|
|
struct iphdr *iph = (struct iphdr *)((*pskb)->data + iphdroff);
|
|
struct tcphdr *hdr;
|
|
unsigned int hdroff = iphdroff + iph->ihl*4;
|
|
u32 oldip, newip;
|
|
u16 *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 ((*pskb)->len >= hdroff + sizeof(struct tcphdr))
|
|
hdrsize = sizeof(struct tcphdr);
|
|
|
|
if (!skb_make_writable(pskb, hdroff + hdrsize))
|
|
return 0;
|
|
|
|
iph = (struct iphdr *)((*pskb)->data + iphdroff);
|
|
hdr = (struct tcphdr *)((*pskb)->data + hdroff);
|
|
|
|
if (maniptype == IP_NAT_MANIP_SRC) {
|
|
/* Get rid of src ip and src pt */
|
|
oldip = iph->saddr;
|
|
newip = tuple->src.ip;
|
|
newport = tuple->src.u.tcp.port;
|
|
portptr = &hdr->source;
|
|
} else {
|
|
/* Get rid of dst ip and dst pt */
|
|
oldip = iph->daddr;
|
|
newip = tuple->dst.ip;
|
|
newport = tuple->dst.u.tcp.port;
|
|
portptr = &hdr->dest;
|
|
}
|
|
|
|
oldport = *portptr;
|
|
*portptr = newport;
|
|
|
|
if (hdrsize < sizeof(*hdr))
|
|
return 1;
|
|
|
|
hdr->check = ip_nat_cheat_check(~oldip, newip,
|
|
ip_nat_cheat_check(oldport ^ 0xFFFF,
|
|
newport,
|
|
hdr->check));
|
|
return 1;
|
|
}
|
|
|
|
struct ip_nat_protocol ip_nat_protocol_tcp = {
|
|
.name = "TCP",
|
|
.protonum = IPPROTO_TCP,
|
|
.me = THIS_MODULE,
|
|
.manip_pkt = tcp_manip_pkt,
|
|
.in_range = tcp_in_range,
|
|
.unique_tuple = tcp_unique_tuple,
|
|
#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
|
|
defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
|
|
.range_to_nfattr = ip_nat_port_range_to_nfattr,
|
|
.nfattr_to_range = ip_nat_port_nfattr_to_range,
|
|
#endif
|
|
};
|