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-rw-r--r--target/linux/generic/patches-2.6.37/160-netfilter_cisco_794x_iphone.patch118
1 files changed, 118 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.37/160-netfilter_cisco_794x_iphone.patch b/target/linux/generic/patches-2.6.37/160-netfilter_cisco_794x_iphone.patch
new file mode 100644
index 0000000000..662a499d17
--- /dev/null
+++ b/target/linux/generic/patches-2.6.37/160-netfilter_cisco_794x_iphone.patch
@@ -0,0 +1,118 @@
+--- a/include/linux/netfilter/nf_conntrack_sip.h
++++ b/include/linux/netfilter/nf_conntrack_sip.h
+@@ -2,12 +2,15 @@
+ #define __NF_CONNTRACK_SIP_H__
+ #ifdef __KERNEL__
+
++#include <linux/types.h>
++
+ #define SIP_PORT 5060
+ #define SIP_TIMEOUT 3600
+
+ struct nf_ct_sip_master {
+ unsigned int register_cseq;
+ unsigned int invite_cseq;
++ __be16 forced_dport;
+ };
+
+ enum sip_expectation_classes {
+--- a/net/ipv4/netfilter/nf_nat_sip.c
++++ b/net/ipv4/netfilter/nf_nat_sip.c
+@@ -73,6 +73,7 @@ static int map_addr(struct sk_buff *skb,
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
++ struct nf_conn_help *help = nfct_help(ct);
+ char buffer[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
+ unsigned int buflen;
+ __be32 newaddr;
+@@ -85,7 +86,8 @@ static int map_addr(struct sk_buff *skb,
+ } else if (ct->tuplehash[dir].tuple.dst.u3.ip == addr->ip &&
+ ct->tuplehash[dir].tuple.dst.u.udp.port == port) {
+ newaddr = ct->tuplehash[!dir].tuple.src.u3.ip;
+- newport = ct->tuplehash[!dir].tuple.src.u.udp.port;
++ newport = help->help.ct_sip_info.forced_dport ? :
++ ct->tuplehash[!dir].tuple.src.u.udp.port;
+ } else
+ return 1;
+
+@@ -121,6 +123,7 @@ static unsigned int ip_nat_sip(struct sk
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
++ struct nf_conn_help *help = nfct_help(ct);
+ unsigned int coff, matchoff, matchlen;
+ enum sip_header_types hdr;
+ union nf_inet_addr addr;
+@@ -229,6 +232,20 @@ next:
+ !map_sip_addr(skb, dataoff, dptr, datalen, SIP_HDR_TO))
+ return NF_DROP;
+
++ /* Mangle destination port for Cisco phones, then fix up checksums */
++ if (dir == IP_CT_DIR_REPLY && help->help.ct_sip_info.forced_dport) {
++ struct udphdr *uh;
++
++ if (!skb_make_writable(skb, skb->len))
++ return NF_DROP;
++
++ uh = (struct udphdr *)(skb->data + ip_hdrlen(skb));
++ uh->dest = help->help.ct_sip_info.forced_dport;
++
++ if (!nf_nat_mangle_udp_packet(skb, ct, ctinfo, 0, 0, NULL, 0))
++ return NF_DROP;
++ }
++
+ return NF_ACCEPT;
+ }
+
+@@ -280,8 +297,10 @@ static unsigned int ip_nat_sip_expect(st
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
++ struct nf_conn_help *help = nfct_help(ct);
+ __be32 newip;
+ u_int16_t port;
++ __be16 srcport;
+ char buffer[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
+ unsigned buflen;
+
+@@ -294,8 +313,9 @@ static unsigned int ip_nat_sip_expect(st
+ /* If the signalling port matches the connection's source port in the
+ * original direction, try to use the destination port in the opposite
+ * direction. */
+- if (exp->tuple.dst.u.udp.port ==
+- ct->tuplehash[dir].tuple.src.u.udp.port)
++ srcport = help->help.ct_sip_info.forced_dport ? :
++ ct->tuplehash[dir].tuple.src.u.udp.port;
++ if (exp->tuple.dst.u.udp.port == srcport)
+ port = ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.port);
+ else
+ port = ntohs(exp->tuple.dst.u.udp.port);
+--- a/net/netfilter/nf_conntrack_sip.c
++++ b/net/netfilter/nf_conntrack_sip.c
+@@ -1363,8 +1363,25 @@ static int process_sip_request(struct sk
+ {
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
++ struct nf_conn_help *help = nfct_help(ct);
++ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+ unsigned int matchoff, matchlen;
+ unsigned int cseq, i;
++ union nf_inet_addr addr;
++ __be16 port;
++
++ /* Many Cisco IP phones use a high source port for SIP requests, but
++ * listen for the response on port 5060. If we are the local
++ * router for one of these phones, save the port number from the
++ * Via: header so that nf_nat_sip can redirect the responses to
++ * the correct port.
++ */
++ if (ct_sip_parse_header_uri(ct, *dptr, NULL, *datalen,
++ SIP_HDR_VIA_UDP, NULL, &matchoff,
++ &matchlen, &addr, &port) > 0 &&
++ port != ct->tuplehash[dir].tuple.src.u.udp.port &&
++ nf_inet_addr_cmp(&addr, &ct->tuplehash[dir].tuple.src.u3))
++ help->help.ct_sip_info.forced_dport = port;
+
+ for (i = 0; i < ARRAY_SIZE(sip_handlers); i++) {
+ const struct sip_handler *handler;