From 811927ccfe90fbfcfff5253ba7f95057f6cae692 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Sun, 26 Aug 2012 19:14:01 +0200 Subject: netfilter: nf_conntrack: restrict NAT helper invocation to IPv4 The NAT helpers currently only handle IPv4 packets correctly. Restrict invocation of the helpers to IPv4 in preparation of IPv6 NAT. Signed-off-by: Patrick McHardy diff --git a/net/netfilter/nf_conntrack_amanda.c b/net/netfilter/nf_conntrack_amanda.c index f2de8c5..184c0dc 100644 --- a/net/netfilter/nf_conntrack_amanda.c +++ b/net/netfilter/nf_conntrack_amanda.c @@ -154,7 +154,8 @@ static int amanda_help(struct sk_buff *skb, IPPROTO_TCP, NULL, &port); nf_nat_amanda = rcu_dereference(nf_nat_amanda_hook); - if (nf_nat_amanda && ct->status & IPS_NAT_MASK) + if (nf_nat_amanda && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) ret = nf_nat_amanda(skb, ctinfo, off - dataoff, len, exp); else if (nf_ct_expect_related(exp) != 0) diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c index 4bb771d..3e1587e 100644 --- a/net/netfilter/nf_conntrack_ftp.c +++ b/net/netfilter/nf_conntrack_ftp.c @@ -487,7 +487,8 @@ static int help(struct sk_buff *skb, /* Now, NAT might want to mangle the packet, and register the * (possibly changed) expectation itself. */ nf_nat_ftp = rcu_dereference(nf_nat_ftp_hook); - if (nf_nat_ftp && ct->status & IPS_NAT_MASK) + if (nf_nat_ftp && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) ret = nf_nat_ftp(skb, ctinfo, search[dir][i].ftptype, matchoff, matchlen, exp); else { diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c index 4283b20..517c5e3 100644 --- a/net/netfilter/nf_conntrack_h323_main.c +++ b/net/netfilter/nf_conntrack_h323_main.c @@ -295,6 +295,7 @@ static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(ct->tuplehash[dir].tuple.src.u3)) && (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && + nf_ct_l3num(ct) == NFPROTO_IPV4 && ct->status & IPS_NAT_MASK) { /* NAT needed */ ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff, @@ -353,6 +354,7 @@ static int expect_t120(struct sk_buff *skb, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(ct->tuplehash[dir].tuple.src.u3)) && (nat_t120 = rcu_dereference(nat_t120_hook)) && + nf_ct_l3num(ct) == NFPROTO_IPV4 && ct->status & IPS_NAT_MASK) { /* NAT needed */ ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr, @@ -688,6 +690,7 @@ static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(ct->tuplehash[dir].tuple.src.u3)) && (nat_h245 = rcu_dereference(nat_h245_hook)) && + nf_ct_l3num(ct) == NFPROTO_IPV4 && ct->status & IPS_NAT_MASK) { /* NAT needed */ ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr, @@ -811,6 +814,7 @@ static int expect_callforwarding(struct sk_buff *skb, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(ct->tuplehash[dir].tuple.src.u3)) && (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && + nf_ct_l3num(ct) == NFPROTO_IPV4 && ct->status & IPS_NAT_MASK) { /* Need NAT */ ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff, @@ -852,7 +856,8 @@ static int process_setup(struct sk_buff *skb, struct nf_conn *ct, set_h225_addr = rcu_dereference(set_h225_addr_hook); if ((setup->options & eSetup_UUIE_destCallSignalAddress) && - (set_h225_addr) && ct->status & IPS_NAT_MASK && + (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK && get_h225_addr(ct, *data, &setup->destCallSignalAddress, &addr, &port) && memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { @@ -868,7 +873,8 @@ static int process_setup(struct sk_buff *skb, struct nf_conn *ct, } if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && - (set_h225_addr) && ct->status & IPS_NAT_MASK && + (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK && get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, &addr, &port) && memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { @@ -1278,7 +1284,8 @@ static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ nat_q931 = rcu_dereference(nat_q931_hook); - if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ + if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) { /* Need NAT */ ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp); } else { /* Conntrack only */ if (nf_ct_expect_related(exp) == 0) { @@ -1306,7 +1313,8 @@ static int process_grq(struct sk_buff *skb, struct nf_conn *ct, pr_debug("nf_ct_ras: GRQ\n"); set_ras_addr = rcu_dereference(set_ras_addr_hook); - if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ + if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) /* NATed */ return set_ras_addr(skb, ct, ctinfo, data, &grq->rasAddress, 1); return 0; @@ -1374,7 +1382,8 @@ static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, return -1; set_ras_addr = rcu_dereference(set_ras_addr_hook); - if (set_ras_addr && ct->status & IPS_NAT_MASK) { + if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) { ret = set_ras_addr(skb, ct, ctinfo, data, rrq->rasAddress.item, rrq->rasAddress.count); @@ -1405,7 +1414,8 @@ static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, pr_debug("nf_ct_ras: RCF\n"); set_sig_addr = rcu_dereference(set_sig_addr_hook); - if (set_sig_addr && ct->status & IPS_NAT_MASK) { + if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) { ret = set_sig_addr(skb, ct, ctinfo, data, rcf->callSignalAddress.item, rcf->callSignalAddress.count); @@ -1453,7 +1463,8 @@ static int process_urq(struct sk_buff *skb, struct nf_conn *ct, pr_debug("nf_ct_ras: URQ\n"); set_sig_addr = rcu_dereference(set_sig_addr_hook); - if (set_sig_addr && ct->status & IPS_NAT_MASK) { + if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) { ret = set_sig_addr(skb, ct, ctinfo, data, urq->callSignalAddress.item, urq->callSignalAddress.count); @@ -1491,6 +1502,7 @@ static int process_arq(struct sk_buff *skb, struct nf_conn *ct, &addr, &port) && !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && port == info->sig_port[dir] && + nf_ct_l3num(ct) == NFPROTO_IPV4 && set_h225_addr && ct->status & IPS_NAT_MASK) { /* Answering ARQ */ return set_h225_addr(skb, data, 0, @@ -1503,7 +1515,8 @@ static int process_arq(struct sk_buff *skb, struct nf_conn *ct, 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) { + set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) { /* Calling ARQ */ return set_h225_addr(skb, data, 0, &arq->srcCallSignalAddress, @@ -1535,7 +1548,8 @@ static int process_acf(struct sk_buff *skb, struct nf_conn *ct, if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { /* Answering ACF */ set_sig_addr = rcu_dereference(set_sig_addr_hook); - if (set_sig_addr && ct->status & IPS_NAT_MASK) + if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) return set_sig_addr(skb, ct, ctinfo, data, &acf->destCallSignalAddress, 1); return 0; @@ -1571,7 +1585,8 @@ static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, pr_debug("nf_ct_ras: LRQ\n"); set_ras_addr = rcu_dereference(set_ras_addr_hook); - if (set_ras_addr && ct->status & IPS_NAT_MASK) + if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) return set_ras_addr(skb, ct, ctinfo, data, &lrq->replyAddress, 1); return 0; @@ -1628,7 +1643,8 @@ static int process_irr(struct sk_buff *skb, struct nf_conn *ct, pr_debug("nf_ct_ras: IRR\n"); set_ras_addr = rcu_dereference(set_ras_addr_hook); - if (set_ras_addr && ct->status & IPS_NAT_MASK) { + if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) { ret = set_ras_addr(skb, ct, ctinfo, data, &irr->rasAddress, 1); if (ret < 0) @@ -1636,7 +1652,8 @@ static int process_irr(struct sk_buff *skb, struct nf_conn *ct, } set_sig_addr = rcu_dereference(set_sig_addr_hook); - if (set_sig_addr && ct->status & IPS_NAT_MASK) { + if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) { ret = set_sig_addr(skb, ct, ctinfo, data, irr->callSignalAddress.item, irr->callSignalAddress.count); diff --git a/net/netfilter/nf_conntrack_irc.c b/net/netfilter/nf_conntrack_irc.c index 009c52c..e06dc2f 100644 --- a/net/netfilter/nf_conntrack_irc.c +++ b/net/netfilter/nf_conntrack_irc.c @@ -204,7 +204,8 @@ static int help(struct sk_buff *skb, unsigned int protoff, IPPROTO_TCP, NULL, &port); nf_nat_irc = rcu_dereference(nf_nat_irc_hook); - if (nf_nat_irc && ct->status & IPS_NAT_MASK) + if (nf_nat_irc && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) ret = nf_nat_irc(skb, ctinfo, addr_beg_p - ib_ptr, addr_end_p - addr_beg_p, diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c index 5c0a112..d08e0ba 100644 --- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -981,7 +981,8 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int dataoff, IPPROTO_UDP, NULL, &rtcp_port); nf_nat_sdp_media = rcu_dereference(nf_nat_sdp_media_hook); - if (nf_nat_sdp_media && ct->status & IPS_NAT_MASK && !direct_rtp) + if (nf_nat_sdp_media && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK && !direct_rtp) ret = nf_nat_sdp_media(skb, dataoff, dptr, datalen, rtp_exp, rtcp_exp, mediaoff, medialen, daddr); @@ -1104,7 +1105,8 @@ static int process_sdp(struct sk_buff *skb, unsigned int dataoff, return ret; /* Update media connection address if present */ - if (maddr_len && nf_nat_sdp_addr && ct->status & IPS_NAT_MASK) { + if (maddr_len && nf_nat_sdp_addr && + nf_ct_l3num(ct) == NFPROTO_IPV4 && ct->status & IPS_NAT_MASK) { ret = nf_nat_sdp_addr(skb, dataoff, dptr, datalen, mediaoff, c_hdr, SDP_HDR_MEDIA, &rtp_addr); @@ -1116,7 +1118,8 @@ static int process_sdp(struct sk_buff *skb, unsigned int dataoff, /* Update session connection and owner addresses */ nf_nat_sdp_session = rcu_dereference(nf_nat_sdp_session_hook); - if (nf_nat_sdp_session && ct->status & IPS_NAT_MASK) + if (nf_nat_sdp_session && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) ret = nf_nat_sdp_session(skb, dataoff, dptr, datalen, sdpoff, &rtp_addr); @@ -1275,7 +1278,8 @@ static int process_register_request(struct sk_buff *skb, unsigned int dataoff, exp->flags = NF_CT_EXPECT_PERMANENT | NF_CT_EXPECT_INACTIVE; nf_nat_sip_expect = rcu_dereference(nf_nat_sip_expect_hook); - if (nf_nat_sip_expect && ct->status & IPS_NAT_MASK) + if (nf_nat_sip_expect && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) ret = nf_nat_sip_expect(skb, dataoff, dptr, datalen, exp, matchoff, matchlen); else { @@ -1453,7 +1457,8 @@ static int process_sip_msg(struct sk_buff *skb, struct nf_conn *ct, else ret = process_sip_response(skb, dataoff, dptr, datalen); - if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) { + if (ret == NF_ACCEPT && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) { nf_nat_sip = rcu_dereference(nf_nat_sip_hook); if (nf_nat_sip && !nf_nat_sip(skb, dataoff, dptr, datalen)) ret = NF_DROP; @@ -1534,7 +1539,8 @@ static int sip_help_tcp(struct sk_buff *skb, unsigned int protoff, datalen = datalen + diff - msglen; } - if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) { + if (ret == NF_ACCEPT && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) { nf_nat_sip_seq_adjust = rcu_dereference(nf_nat_sip_seq_adjust_hook); if (nf_nat_sip_seq_adjust) nf_nat_sip_seq_adjust(skb, tdiff); diff --git a/net/netfilter/nf_conntrack_tftp.c b/net/netfilter/nf_conntrack_tftp.c index 81fc61c..9363e1c 100644 --- a/net/netfilter/nf_conntrack_tftp.c +++ b/net/netfilter/nf_conntrack_tftp.c @@ -72,7 +72,8 @@ static int tftp_help(struct sk_buff *skb, nf_ct_dump_tuple(&exp->tuple); nf_nat_tftp = rcu_dereference(nf_nat_tftp_hook); - if (nf_nat_tftp && ct->status & IPS_NAT_MASK) + if (nf_nat_tftp && nf_ct_l3num(ct) == NFPROTO_IPV4 && + ct->status & IPS_NAT_MASK) ret = nf_nat_tftp(skb, ctinfo, exp); else if (nf_ct_expect_related(exp) != 0) ret = NF_DROP; -- cgit v0.10.2