static int set_sig_addr(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned char **data,
TransportAddress *taddr, int count)
{
const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
int dir = CTINFO2DIR(ctinfo);
int i;
__be16 port;
union nf_inet_addr addr;
#ifdef CONFIG_HTC_NETWORK_MODIFY
if (IS_ERR(info) || (!info))
printk(KERN_ERR "[NET] info is NULL in %s!\n", __func__);
#endif
for (i = 0; i < count; i++) {
if (get_h225_addr(ct, *data, &taddr[i], &addr, &port)) {
if (addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
port == info->sig_port[dir]) {
/* GW->GK */
/* Fix for Gnomemeeting */
if (i > 0 &&
get_h225_addr(ct, *data, &taddr[0],
&addr, &port) &&
(ntohl(addr.ip) & 0xff000000) == 0x7f000000)
i = 0;
pr_debug("nf_nat_ras: set signal address %pI4:%hu->%pI4:%hu\n",
&addr.ip, port,
&ct->tuplehash[!dir].tuple.dst.u3.ip,
info->sig_port[!dir]);
return set_h225_addr(skb, data, 0, &taddr[i],
&ct->tuplehash[!dir].
tuple.dst.u3,
info->sig_port[!dir]);
} else if (addr.ip == ct->tuplehash[dir].tuple.dst.u3.ip &&
port == info->sig_port[dir]) {
/* GK->GW */
pr_debug("nf_nat_ras: set signal address %pI4:%hu->%pI4:%hu\n",
&addr.ip, port,
&ct->tuplehash[!dir].tuple.src.u3.ip,
info->sig_port[!dir]);
return set_h225_addr(skb, data, 0, &taddr[i],
&ct->tuplehash[!dir].
tuple.src.u3,
info->sig_port[!dir]);
}
}
}
return 0;
}
static int set_sig_addr(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned char **data,
TransportAddress *taddr, int count)
{
struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
int dir = CTINFO2DIR(ctinfo);
int i;
__be16 port;
union nf_inet_addr addr;
for (i = 0; i < count; i++) {
if (get_h225_addr(ct, *data, &taddr[i], &addr, &port)) {
if (addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
port == info->sig_port[dir]) {
/* GW->GK */
/* Fix for Gnomemeeting */
if (i > 0 &&
get_h225_addr(ct, *data, &taddr[0],
&addr, &port) &&
(ntohl(addr.ip) & 0xff000000) == 0x7f000000)
i = 0;
DEBUGP
("nf_nat_ras: set signal address "
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
NIPQUAD(ip), port,
NIPQUAD(ct->tuplehash[!dir].tuple.dst.
ip), info->sig_port[!dir]);
return set_h225_addr(skb, data, 0, &taddr[i],
&ct->tuplehash[!dir].
tuple.dst.u3,
info->sig_port[!dir]);
} else if (addr.ip == ct->tuplehash[dir].tuple.dst.u3.ip &&
port == info->sig_port[dir]) {
/* GK->GW */
DEBUGP
("nf_nat_ras: set signal address "
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
NIPQUAD(ip), port,
NIPQUAD(ct->tuplehash[!dir].tuple.src.
ip), info->sig_port[!dir]);
return set_h225_addr(skb, data, 0, &taddr[i],
&ct->tuplehash[!dir].
tuple.src.u3,
info->sig_port[!dir]);
}
}
}
return 0;
}
static int set_ras_addr(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned char **data,
TransportAddress *taddr, int count)
{
int dir = CTINFO2DIR(ctinfo);
int i;
__be16 port;
union nf_inet_addr addr;
for (i = 0; i < count; i++) {
if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
port == ct->tuplehash[dir].tuple.src.u.udp.port) {
DEBUGP("nf_nat_ras: set rasAddress "
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
NIPQUAD(ip), ntohs(port),
NIPQUAD(ct->tuplehash[!dir].tuple.dst.u3.ip),
ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.
port));
return set_h225_addr(skb, data, 0, &taddr[i],
&ct->tuplehash[!dir].tuple.dst.u3,
ct->tuplehash[!dir].tuple.
dst.u.udp.port);
}
}
return 0;
}
static int set_ras_addr(struct sk_buff **pskb, struct ip_conntrack *ct,
enum ip_conntrack_info ctinfo,
unsigned char **data,
TransportAddress * addr, int count)
{
int dir = CTINFO2DIR(ctinfo);
int i;
__be32 ip;
u_int16_t port;
for (i = 0; i < count; i++) {
if (get_h225_addr(*data, &addr[i], &ip, &port) &&
ip == ct->tuplehash[dir].tuple.src.ip &&
port == ntohs(ct->tuplehash[dir].tuple.src.u.udp.port)) {
DEBUGP("ip_nat_ras: set rasAddress "
"%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
NIPQUAD(ip), port,
NIPQUAD(ct->tuplehash[!dir].tuple.dst.ip),
ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.
port));
return set_h225_addr(pskb, data, 0, &addr[i],
ct->tuplehash[!dir].tuple.dst.ip,
ntohs(ct->tuplehash[!dir].tuple.
dst.u.udp.port));
}
}
return 0;
}
static int nat_h245(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned char **data, int dataoff,
TransportAddress *taddr, __be16 port,
struct nf_conntrack_expect *exp)
{
struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
int dir = CTINFO2DIR(ctinfo);
u_int16_t nated_port = ntohs(port);
/* Set expectations for NAT */
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
exp->expectfn = nf_nat_follow_master;
exp->dir = !dir;
/* Check existing expects */
if (info->sig_port[dir] == port)
nated_port = ntohs(info->sig_port[!dir]);
/* Try to get same port: if not, try to change it. */
for (; nated_port != 0; nated_port++) {
int ret;
exp->tuple.dst.u.tcp.port = htons(nated_port);
ret = nf_ct_expect_related(exp);
if (ret == 0)
break;
else if (ret != -EBUSY) {
nated_port = 0;
break;
}
}
if (nated_port == 0) { /* No port available */
if (net_ratelimit())
pr_notice("nf_nat_q931: out of TCP ports\n");
return 0;
}
/* Modify signal */
if (set_h225_addr(skb, data, dataoff, taddr,
&ct->tuplehash[!dir].tuple.dst.u3,
htons(nated_port)) == 0) {
/* Save ports */
info->sig_port[dir] = port;
info->sig_port[!dir] = htons(nated_port);
} else {
nf_ct_unexpect_related(exp);
return -1;
}
pr_debug("nf_nat_q931: expect H.245 %pI4:%hu->%pI4:%hu\n",
&exp->tuple.src.u3.ip,
ntohs(exp->tuple.src.u.tcp.port),
&exp->tuple.dst.u3.ip,
ntohs(exp->tuple.dst.u.tcp.port));
return 0;
}
static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned char **data, AdmissionRequest *arq)
{
const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
int dir = CTINFO2DIR(ctinfo);
__be16 port;
union nf_inet_addr addr;
typeof(set_h225_addr_hook) set_h225_addr;
pr_debug("nf_ct_ras: ARQ\n");
#ifdef CONFIG_HTC_NETWORK_MODIFY
if (IS_ERR(info) || (!info))
printk(KERN_ERR "[NET] info is NULL in %s!\n", __func__);
#endif
set_h225_addr = rcu_dereference(set_h225_addr_hook);
if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
get_h225_addr(ct, *data, &arq->destCallSignalAddress,
&addr, &port) &&
!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
port == info->sig_port[dir] &&
set_h225_addr && ct->status & IPS_NAT_MASK) {
return set_h225_addr(skb, data, 0,
&arq->destCallSignalAddress,
&ct->tuplehash[!dir].tuple.dst.u3,
info->sig_port[!dir]);
}
if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
&addr, &port) &&
!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
set_h225_addr && ct->status & IPS_NAT_MASK) {
return set_h225_addr(skb, data, 0,
&arq->srcCallSignalAddress,
&ct->tuplehash[!dir].tuple.dst.u3,
port);
}
return 0;
}
static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned char **data, int dataoff,
Setup_UUIE *setup)
{
int dir = CTINFO2DIR(ctinfo);
int ret;
int i;
__be16 port;
union nf_inet_addr addr;
typeof(set_h225_addr_hook) set_h225_addr;
pr_debug("nf_ct_q931: Setup\n");
if (setup->options & eSetup_UUIE_h245Address) {
ret = expect_h245(skb, ct, ctinfo, data, dataoff,
&setup->h245Address);
if (ret < 0)
return -1;
}
set_h225_addr = rcu_dereference(set_h225_addr_hook);
if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
(set_h225_addr) && ct->status & IPS_NAT_MASK &&
get_h225_addr(ct, *data, &setup->destCallSignalAddress,
&addr, &port) &&
memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
&addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
ret = set_h225_addr(skb, data, dataoff,
&setup->destCallSignalAddress,
&ct->tuplehash[!dir].tuple.src.u3,
ct->tuplehash[!dir].tuple.src.u.tcp.port);
if (ret < 0)
return -1;
}
if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
(set_h225_addr) && ct->status & IPS_NAT_MASK &&
get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
&addr, &port) &&
memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
&addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
ret = set_h225_addr(skb, data, dataoff,
&setup->sourceCallSignalAddress,
&ct->tuplehash[!dir].tuple.dst.u3,
ct->tuplehash[!dir].tuple.dst.u.tcp.port);
if (ret < 0)
return -1;
}
if (setup->options & eSetup_UUIE_fastStart) {
for (i = 0; i < setup->fastStart.count; i++) {
ret = process_olc(skb, ct, ctinfo, data, dataoff,
&setup->fastStart.item[i]);
if (ret < 0)
return -1;
}
}
return 0;
}
