[NETFILTER]: nf_conntrack_sip: create RTCP expectations
Create expectations for the RTCP connections in addition to RTP connections. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -96,7 +96,8 @@ extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
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extern unsigned int (*nf_nat_sdp_hook)(struct sk_buff *skb,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *exp);
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp);
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extern int ct_sip_parse_request(const struct nf_conn *ct,
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const char *dptr, unsigned int datalen,
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@ -364,7 +364,8 @@ static unsigned int mangle_sdp(struct sk_buff *skb,
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Mangle it, and change the expectation to match the new version. */
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static unsigned int ip_nat_sdp(struct sk_buff *skb,
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const char **dptr, unsigned int *datalen,
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struct nf_conntrack_expect *exp)
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp)
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{
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
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@ -375,31 +376,40 @@ static unsigned int ip_nat_sdp(struct sk_buff *skb,
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/* Connection will come from reply */
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if (ct->tuplehash[dir].tuple.src.u3.ip ==
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ct->tuplehash[!dir].tuple.dst.u3.ip)
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newip = exp->tuple.dst.u3.ip;
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newip = rtp_exp->tuple.dst.u3.ip;
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else
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newip = ct->tuplehash[!dir].tuple.dst.u3.ip;
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exp->saved_ip = exp->tuple.dst.u3.ip;
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exp->tuple.dst.u3.ip = newip;
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exp->saved_proto.udp.port = exp->tuple.dst.u.udp.port;
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exp->dir = !dir;
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rtp_exp->saved_ip = rtp_exp->tuple.dst.u3.ip;
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rtp_exp->tuple.dst.u3.ip = newip;
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rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port;
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rtp_exp->dir = !dir;
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rtp_exp->expectfn = ip_nat_sip_expected;
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/* When you see the packet, we need to NAT it the same as the
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this one. */
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exp->expectfn = ip_nat_sip_expected;
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rtcp_exp->saved_ip = rtcp_exp->tuple.dst.u3.ip;
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rtcp_exp->tuple.dst.u3.ip = newip;
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rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port;
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rtcp_exp->dir = !dir;
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rtcp_exp->expectfn = ip_nat_sip_expected;
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/* Try to get same port: if not, try to change it. */
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for (port = ntohs(exp->saved_proto.udp.port); port != 0; port++) {
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exp->tuple.dst.u.udp.port = htons(port);
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if (nf_ct_expect_related(exp) == 0)
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/* Try to get same pair of ports: if not, try to change them. */
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for (port = ntohs(rtp_exp->tuple.dst.u.udp.port);
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port != 0; port += 2) {
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rtp_exp->tuple.dst.u.udp.port = htons(port);
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if (nf_ct_expect_related(rtp_exp) != 0)
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continue;
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rtcp_exp->tuple.dst.u.udp.port = htons(port + 1);
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if (nf_ct_expect_related(rtcp_exp) == 0)
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break;
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nf_ct_unexpect_related(rtp_exp);
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}
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if (port == 0)
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return NF_DROP;
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if (!mangle_sdp(skb, ctinfo, ct, newip, port, dptr, datalen)) {
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nf_ct_unexpect_related(exp);
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nf_ct_unexpect_related(rtp_exp);
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nf_ct_unexpect_related(rtcp_exp);
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return NF_DROP;
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}
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return NF_ACCEPT;
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@ -63,7 +63,9 @@ EXPORT_SYMBOL_GPL(nf_nat_sip_expect_hook);
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unsigned int (*nf_nat_sdp_hook)(struct sk_buff *skb,
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const char **dptr,
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unsigned int *datalen,
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struct nf_conntrack_expect *exp) __read_mostly;
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struct nf_conntrack_expect *rtp_exp,
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struct nf_conntrack_expect *rtcp_exp)
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__read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sdp_hook);
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static int string_len(const struct nf_conn *ct, const char *dptr,
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@ -659,18 +661,20 @@ static void flush_expectations(struct nf_conn *ct, bool media)
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spin_unlock_bh(&nf_conntrack_lock);
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}
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static int set_expected_rtp(struct sk_buff *skb,
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const char **dptr, unsigned int *datalen,
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union nf_inet_addr *daddr, __be16 port)
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static int set_expected_rtp_rtcp(struct sk_buff *skb,
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const char **dptr, unsigned int *datalen,
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union nf_inet_addr *daddr, __be16 port)
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{
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struct nf_conntrack_expect *exp;
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struct nf_conntrack_expect *exp, *rtp_exp, *rtcp_exp;
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enum ip_conntrack_info ctinfo;
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struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
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enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
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union nf_inet_addr *saddr;
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struct nf_conntrack_tuple tuple;
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int family = ct->tuplehash[!dir].tuple.src.l3num;
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int skip_expect = 0, ret;
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int skip_expect = 0, ret = NF_DROP;
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u_int16_t base_port;
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__be16 rtp_port, rtcp_port;
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typeof(nf_nat_sdp_hook) nf_nat_sdp;
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saddr = NULL;
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@ -704,23 +708,37 @@ static int set_expected_rtp(struct sk_buff *skb,
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if (skip_expect)
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return NF_ACCEPT;
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exp = nf_ct_expect_alloc(ct);
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if (exp == NULL)
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return NF_DROP;
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nf_ct_expect_init(exp, SIP_EXPECT_AUDIO, family, saddr, daddr,
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IPPROTO_UDP, NULL, &port);
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base_port = ntohs(tuple.dst.u.udp.port) & ~1;
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rtp_port = htons(base_port);
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rtcp_port = htons(base_port + 1);
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rtp_exp = nf_ct_expect_alloc(ct);
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if (rtp_exp == NULL)
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goto err1;
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nf_ct_expect_init(rtp_exp, SIP_EXPECT_AUDIO, family, saddr, daddr,
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IPPROTO_UDP, NULL, &rtp_port);
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rtcp_exp = nf_ct_expect_alloc(ct);
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if (rtcp_exp == NULL)
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goto err2;
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nf_ct_expect_init(rtcp_exp, SIP_EXPECT_AUDIO, family, saddr, daddr,
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IPPROTO_UDP, NULL, &rtcp_port);
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nf_nat_sdp = rcu_dereference(nf_nat_sdp_hook);
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if (nf_nat_sdp && ct->status & IPS_NAT_MASK)
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ret = nf_nat_sdp(skb, dptr, datalen, exp);
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ret = nf_nat_sdp(skb, dptr, datalen, rtp_exp, rtcp_exp);
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else {
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if (nf_ct_expect_related(exp) != 0)
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ret = NF_DROP;
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else
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ret = NF_ACCEPT;
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if (nf_ct_expect_related(rtp_exp) == 0) {
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if (nf_ct_expect_related(rtcp_exp) != 0)
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nf_ct_unexpect_related(rtp_exp);
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else
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ret = NF_ACCEPT;
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}
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}
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nf_ct_expect_put(exp);
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nf_ct_expect_put(rtcp_exp);
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err2:
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nf_ct_expect_put(rtp_exp);
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err1:
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return ret;
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}
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@ -758,7 +776,7 @@ static int process_sdp(struct sk_buff *skb,
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if (port < 1024 || port > 65535)
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return NF_DROP;
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return set_expected_rtp(skb, dptr, datalen, &addr, htons(port));
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return set_expected_rtp_rtcp(skb, dptr, datalen, &addr, htons(port));
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}
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static int process_invite_response(struct sk_buff *skb,
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const char **dptr, unsigned int *datalen,
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@ -1101,7 +1119,7 @@ static const struct nf_conntrack_expect_policy sip_exp_policy[SIP_EXPECT_MAX + 1
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.timeout = 3 * 60,
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},
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[SIP_EXPECT_AUDIO] = {
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.max_expected = IP_CT_DIR_MAX,
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.max_expected = 2 * IP_CT_DIR_MAX,
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.timeout = 3 * 60,
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},
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};
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