diff options
| -rw-r--r-- | target/linux/generic/patches-2.6.37/160-netfilter_cisco_794x_iphone.patch | 118 |
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 000000000..662a499d1 --- /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; |