Commit 33cb1e9a authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[NETFILTER]: nf_conntrack_sip: perform NAT after parsing



Perform NAT last after parsing the packet. This makes no difference
currently, but is needed when dealing with registrations to make
sure we seen the unNATed addresses.
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 30f33e6d
......@@ -104,9 +104,6 @@ static unsigned int ip_nat_sip(struct sk_buff *skb,
union nf_inet_addr addr;
__be16 port;
if (*datalen < strlen("SIP/2.0"))
return NF_ACCEPT;
/* Basic rules: requests and responses. */
if (strnicmp(*dptr, "SIP/2.0", strlen("SIP/2.0")) != 0) {
if (ct_sip_parse_request(ct, *dptr, *datalen,
......
......@@ -700,6 +700,7 @@ static int sip_help(struct sk_buff *skb,
{
unsigned int dataoff, datalen;
const char *dptr;
int ret;
typeof(nf_nat_sip_hook) nf_nat_sip;
/* No Data ? */
......@@ -716,20 +717,22 @@ static int sip_help(struct sk_buff *skb,
return NF_ACCEPT;
}
nf_nat_sip = rcu_dereference(nf_nat_sip_hook);
if (nf_nat_sip && ct->status & IPS_NAT_MASK) {
if (!nf_nat_sip(skb, &dptr, &datalen))
return NF_DROP;
}
datalen = skb->len - dataoff;
if (datalen < strlen("SIP/2.0 200"))
return NF_ACCEPT;
if (strnicmp(dptr, "SIP/2.0 ", strlen("SIP/2.0 ")) != 0)
return process_sip_request(skb, &dptr, &datalen);
ret = process_sip_request(skb, &dptr, &datalen);
else
return process_sip_response(skb, &dptr, &datalen);
ret = process_sip_response(skb, &dptr, &datalen);
if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) {
nf_nat_sip = rcu_dereference(nf_nat_sip_hook);
if (nf_nat_sip && !nf_nat_sip(skb, &dptr, &datalen))
ret = NF_DROP;
}
return ret;
}
static struct nf_conntrack_helper sip[MAX_PORTS][2] __read_mostly;
......
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