netfilter: nf_nat: support IPv6 in SIP NAT helper
Add IPv6 support to the SIP NAT helper. There are no functional differences to IPv4 NAT, just different formats for addresses. Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy
Pablo Neira Ayuso
parent
ee6eb96673
commit
9a66482106
7 changed files with 144 additions and 116 deletions
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@ -99,10 +99,8 @@ enum sip_header_types {
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enum sdp_header_types {
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SDP_HDR_UNSPEC,
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SDP_HDR_VERSION,
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SDP_HDR_OWNER_IP4,
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SDP_HDR_CONNECTION_IP4,
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SDP_HDR_OWNER_IP6,
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SDP_HDR_CONNECTION_IP6,
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SDP_HDR_OWNER,
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SDP_HDR_CONNECTION,
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SDP_HDR_MEDIA,
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};
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@ -111,7 +109,8 @@ extern unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb,
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unsigned int dataoff,
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const char **dptr,
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unsigned int *datalen);
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extern void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb, s16 off);
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extern void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb,
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unsigned int protoff, s16 off);
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extern unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
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unsigned int protoff,
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unsigned int dataoff,
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@ -242,11 +242,6 @@ config NF_NAT_H323
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depends on NF_CONNTRACK && NF_NAT_IPV4
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default NF_NAT_IPV4 && NF_CONNTRACK_H323
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config NF_NAT_SIP
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tristate
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depends on NF_CONNTRACK && NF_NAT_IPV4
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default NF_NAT_IPV4 && NF_CONNTRACK_SIP
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# mangle + specific targets
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config IP_NF_MANGLE
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tristate "Packet mangling"
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@ -23,7 +23,6 @@ obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o
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obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
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obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
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obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
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obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
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obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
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obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
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@ -390,6 +390,11 @@ config NF_NAT_FTP
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depends on NF_CONNTRACK && NF_NAT
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default NF_NAT && NF_CONNTRACK_FTP
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config NF_NAT_SIP
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tristate
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depends on NF_CONNTRACK && NF_NAT
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default NF_NAT && NF_CONNTRACK_SIP
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endif # NF_CONNTRACK
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# transparent proxy support
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@ -57,6 +57,7 @@ obj-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o
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# NAT helpers
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obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
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obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
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obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
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# transparent proxy support
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obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o
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@ -57,7 +57,8 @@ unsigned int (*nf_nat_sip_hook)(struct sk_buff *skb, unsigned int protoff,
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unsigned int *datalen) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sip_hook);
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void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb, s16 off) __read_mostly;
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void (*nf_nat_sip_seq_adjust_hook)(struct sk_buff *skb, unsigned int protoff,
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s16 off) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_sip_seq_adjust_hook);
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unsigned int (*nf_nat_sip_expect_hook)(struct sk_buff *skb,
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@ -742,13 +743,18 @@ static int sdp_addr_len(const struct nf_conn *ct, const char *dptr,
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* be tolerant and also accept records terminated with a single newline
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* character". We handle both cases.
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*/
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static const struct sip_header ct_sdp_hdrs[] = {
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[SDP_HDR_VERSION] = SDP_HDR("v=", NULL, digits_len),
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[SDP_HDR_OWNER_IP4] = SDP_HDR("o=", "IN IP4 ", sdp_addr_len),
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[SDP_HDR_CONNECTION_IP4] = SDP_HDR("c=", "IN IP4 ", sdp_addr_len),
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[SDP_HDR_OWNER_IP6] = SDP_HDR("o=", "IN IP6 ", sdp_addr_len),
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[SDP_HDR_CONNECTION_IP6] = SDP_HDR("c=", "IN IP6 ", sdp_addr_len),
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[SDP_HDR_MEDIA] = SDP_HDR("m=", NULL, media_len),
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static const struct sip_header ct_sdp_hdrs_v4[] = {
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[SDP_HDR_VERSION] = SDP_HDR("v=", NULL, digits_len),
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[SDP_HDR_OWNER] = SDP_HDR("o=", "IN IP4 ", sdp_addr_len),
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[SDP_HDR_CONNECTION] = SDP_HDR("c=", "IN IP4 ", sdp_addr_len),
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[SDP_HDR_MEDIA] = SDP_HDR("m=", NULL, media_len),
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};
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static const struct sip_header ct_sdp_hdrs_v6[] = {
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[SDP_HDR_VERSION] = SDP_HDR("v=", NULL, digits_len),
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[SDP_HDR_OWNER] = SDP_HDR("o=", "IN IP6 ", sdp_addr_len),
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[SDP_HDR_CONNECTION] = SDP_HDR("c=", "IN IP6 ", sdp_addr_len),
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[SDP_HDR_MEDIA] = SDP_HDR("m=", NULL, media_len),
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};
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/* Linear string search within SDP header values */
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@ -774,11 +780,14 @@ int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
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enum sdp_header_types term,
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unsigned int *matchoff, unsigned int *matchlen)
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{
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const struct sip_header *hdr = &ct_sdp_hdrs[type];
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const struct sip_header *thdr = &ct_sdp_hdrs[term];
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const struct sip_header *hdrs, *hdr, *thdr;
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const char *start = dptr, *limit = dptr + datalen;
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int shift = 0;
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hdrs = nf_ct_l3num(ct) == NFPROTO_IPV4 ? ct_sdp_hdrs_v4 : ct_sdp_hdrs_v6;
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hdr = &hdrs[type];
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thdr = &hdrs[term];
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for (dptr += dataoff; dptr < limit; dptr++) {
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/* Find beginning of line */
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if (*dptr != '\r' && *dptr != '\n')
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@ -945,12 +954,12 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
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exp->class != class)
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break;
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#ifdef CONFIG_NF_NAT_NEEDED
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if (exp->tuple.src.l3num == AF_INET && !direct_rtp &&
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(exp->saved_addr.ip != exp->tuple.dst.u3.ip ||
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if (!direct_rtp &&
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(!nf_inet_addr_cmp(&exp->saved_addr, &exp->tuple.dst.u3) ||
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exp->saved_proto.udp.port != exp->tuple.dst.u.udp.port) &&
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ct->status & IPS_NAT_MASK) {
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daddr->ip = exp->saved_addr.ip;
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tuple.dst.u3.ip = exp->saved_addr.ip;
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*daddr = exp->saved_addr;
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tuple.dst.u3 = exp->saved_addr;
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tuple.dst.u.udp.port = exp->saved_proto.udp.port;
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direct_rtp = 1;
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} else
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@ -987,8 +996,7 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
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IPPROTO_UDP, NULL, &rtcp_port);
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nf_nat_sdp_media = rcu_dereference(nf_nat_sdp_media_hook);
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if (nf_nat_sdp_media && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
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ct->status & IPS_NAT_MASK && !direct_rtp)
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if (nf_nat_sdp_media && ct->status & IPS_NAT_MASK && !direct_rtp)
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ret = nf_nat_sdp_media(skb, protoff, dataoff, dptr, datalen,
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rtp_exp, rtcp_exp,
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mediaoff, medialen, daddr);
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@ -1044,15 +1052,12 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
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unsigned int i;
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union nf_inet_addr caddr, maddr, rtp_addr;
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unsigned int port;
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enum sdp_header_types c_hdr;
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const struct sdp_media_type *t;
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int ret = NF_ACCEPT;
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typeof(nf_nat_sdp_addr_hook) nf_nat_sdp_addr;
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typeof(nf_nat_sdp_session_hook) nf_nat_sdp_session;
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nf_nat_sdp_addr = rcu_dereference(nf_nat_sdp_addr_hook);
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c_hdr = nf_ct_l3num(ct) == AF_INET ? SDP_HDR_CONNECTION_IP4 :
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SDP_HDR_CONNECTION_IP6;
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/* Find beginning of session description */
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if (ct_sip_get_sdp_header(ct, *dptr, 0, *datalen,
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@ -1066,7 +1071,7 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
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* the end of the session description. */
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caddr_len = 0;
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if (ct_sip_parse_sdp_addr(ct, *dptr, sdpoff, *datalen,
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c_hdr, SDP_HDR_MEDIA,
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SDP_HDR_CONNECTION, SDP_HDR_MEDIA,
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&matchoff, &matchlen, &caddr) > 0)
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caddr_len = matchlen;
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@ -1096,7 +1101,7 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
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/* The media description overrides the session description. */
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maddr_len = 0;
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if (ct_sip_parse_sdp_addr(ct, *dptr, mediaoff, *datalen,
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c_hdr, SDP_HDR_MEDIA,
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SDP_HDR_CONNECTION, SDP_HDR_MEDIA,
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&matchoff, &matchlen, &maddr) > 0) {
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maddr_len = matchlen;
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memcpy(&rtp_addr, &maddr, sizeof(rtp_addr));
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@ -1113,11 +1118,10 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
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return ret;
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/* Update media connection address if present */
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if (maddr_len && nf_nat_sdp_addr &&
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nf_ct_l3num(ct) == NFPROTO_IPV4 && ct->status & IPS_NAT_MASK) {
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if (maddr_len && nf_nat_sdp_addr && ct->status & IPS_NAT_MASK) {
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ret = nf_nat_sdp_addr(skb, protoff, dataoff,
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dptr, datalen,
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mediaoff, c_hdr, SDP_HDR_MEDIA,
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dptr, datalen, mediaoff,
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SDP_HDR_CONNECTION, SDP_HDR_MEDIA,
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&rtp_addr);
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if (ret != NF_ACCEPT)
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return ret;
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@ -1127,8 +1131,7 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
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/* Update session connection and owner addresses */
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nf_nat_sdp_session = rcu_dereference(nf_nat_sdp_session_hook);
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if (nf_nat_sdp_session && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
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ct->status & IPS_NAT_MASK)
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if (nf_nat_sdp_session && ct->status & IPS_NAT_MASK)
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ret = nf_nat_sdp_session(skb, protoff, dataoff,
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dptr, datalen, sdpoff, &rtp_addr);
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@ -1293,8 +1296,7 @@ static int process_register_request(struct sk_buff *skb, unsigned int protoff,
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exp->flags = NF_CT_EXPECT_PERMANENT | NF_CT_EXPECT_INACTIVE;
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nf_nat_sip_expect = rcu_dereference(nf_nat_sip_expect_hook);
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if (nf_nat_sip_expect && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
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ct->status & IPS_NAT_MASK)
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if (nf_nat_sip_expect && ct->status & IPS_NAT_MASK)
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ret = nf_nat_sip_expect(skb, protoff, dataoff, dptr, datalen,
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exp, matchoff, matchlen);
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else {
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@ -1476,8 +1478,7 @@ static int process_sip_msg(struct sk_buff *skb, struct nf_conn *ct,
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else
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ret = process_sip_response(skb, protoff, dataoff, dptr, datalen);
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if (ret == NF_ACCEPT && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
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ct->status & IPS_NAT_MASK) {
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if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) {
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nf_nat_sip = rcu_dereference(nf_nat_sip_hook);
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if (nf_nat_sip && !nf_nat_sip(skb, protoff, dataoff,
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dptr, datalen))
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@ -1560,11 +1561,10 @@ static int sip_help_tcp(struct sk_buff *skb, unsigned int protoff,
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datalen = datalen + diff - msglen;
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}
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if (ret == NF_ACCEPT && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
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ct->status & IPS_NAT_MASK) {
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if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) {
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nf_nat_sip_seq_adjust = rcu_dereference(nf_nat_sip_seq_adjust_hook);
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if (nf_nat_sip_seq_adjust)
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nf_nat_sip_seq_adjust(skb, tdiff);
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nf_nat_sip_seq_adjust(skb, protoff, tdiff);
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}
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return ret;
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@ -3,7 +3,7 @@
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* (C) 2005 by Christian Hentschel <chentschel@arnet.com.ar>
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* based on RR's ip_nat_ftp.c and other modules.
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* (C) 2007 United Security Providers
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* (C) 2007, 2008 Patrick McHardy <kaber@trash.net>
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* (C) 2007, 2008, 2011, 2012 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -12,8 +12,7 @@
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <net/ip.h>
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#include <linux/inet.h>
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#include <linux/udp.h>
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#include <linux/tcp.h>
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@ -41,8 +40,8 @@ static unsigned int mangle_packet(struct sk_buff *skb, unsigned int protoff,
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unsigned int baseoff;
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if (nf_ct_protonum(ct) == IPPROTO_TCP) {
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th = (struct tcphdr *)(skb->data + ip_hdrlen(skb));
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baseoff = ip_hdrlen(skb) + th->doff * 4;
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th = (struct tcphdr *)(skb->data + protoff);
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baseoff = protoff + th->doff * 4;
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matchoff += dataoff - baseoff;
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if (!__nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
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@ -50,7 +49,7 @@ static unsigned int mangle_packet(struct sk_buff *skb, unsigned int protoff,
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buffer, buflen, false))
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return 0;
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} else {
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baseoff = ip_hdrlen(skb) + sizeof(struct udphdr);
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baseoff = protoff + sizeof(struct udphdr);
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matchoff += dataoff - baseoff;
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if (!nf_nat_mangle_udp_packet(skb, ct, ctinfo,
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@ -65,6 +64,28 @@ static unsigned int mangle_packet(struct sk_buff *skb, unsigned int protoff,
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return 1;
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}
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static int sip_sprintf_addr(const struct nf_conn *ct, char *buffer,
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const union nf_inet_addr *addr, bool delim)
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{
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if (nf_ct_l3num(ct) == NFPROTO_IPV4)
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return sprintf(buffer, "%pI4", &addr->ip);
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else {
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if (delim)
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return sprintf(buffer, "[%pI6c]", &addr->ip6);
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else
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return sprintf(buffer, "%pI6c", &addr->ip6);
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}
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}
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static int sip_sprintf_addr_port(const struct nf_conn *ct, char *buffer,
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const union nf_inet_addr *addr, u16 port)
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{
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if (nf_ct_l3num(ct) == NFPROTO_IPV4)
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return sprintf(buffer, "%pI4:%u", &addr->ip, port);
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else
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return sprintf(buffer, "[%pI6c]:%u", &addr->ip6, port);
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}
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static int map_addr(struct sk_buff *skb, unsigned int protoff,
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unsigned int dataoff,
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const char **dptr, unsigned int *datalen,
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@ -74,27 +95,26 @@ static int map_addr(struct sk_buff *skb, unsigned int protoff,
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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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char buffer[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
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char buffer[INET6_ADDRSTRLEN + sizeof("[]:nnnnn")];
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unsigned int buflen;
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__be32 newaddr;
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union nf_inet_addr newaddr;
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__be16 newport;
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if (ct->tuplehash[dir].tuple.src.u3.ip == addr->ip &&
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if (nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3, addr) &&
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ct->tuplehash[dir].tuple.src.u.udp.port == port) {
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newaddr = ct->tuplehash[!dir].tuple.dst.u3.ip;
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newaddr = ct->tuplehash[!dir].tuple.dst.u3;
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newport = ct->tuplehash[!dir].tuple.dst.u.udp.port;
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} else if (ct->tuplehash[dir].tuple.dst.u3.ip == addr->ip &&
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} else if (nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3, addr) &&
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ct->tuplehash[dir].tuple.dst.u.udp.port == port) {
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newaddr = ct->tuplehash[!dir].tuple.src.u3.ip;
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newaddr = ct->tuplehash[!dir].tuple.src.u3;
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newport = ct->tuplehash[!dir].tuple.src.u.udp.port;
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} else
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return 1;
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if (newaddr == addr->ip && newport == port)
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if (nf_inet_addr_cmp(&newaddr, addr) && newport == port)
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return 1;
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buflen = sprintf(buffer, "%pI4:%u", &newaddr, ntohs(newport));
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buflen = sip_sprintf_addr_port(ct, buffer, &newaddr, ntohs(newport));
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||||
return mangle_packet(skb, protoff, dataoff, dptr, datalen,
|
||||
matchoff, matchlen, buffer, buflen);
|
||||
}
|
||||
|
|
@ -117,7 +137,7 @@ static int map_sip_addr(struct sk_buff *skb, unsigned int protoff,
|
|||
matchoff, matchlen, &addr, port);
|
||||
}
|
||||
|
||||
static unsigned int ip_nat_sip(struct sk_buff *skb, unsigned int protoff,
|
||||
static unsigned int nf_nat_sip(struct sk_buff *skb, unsigned int protoff,
|
||||
unsigned int dataoff,
|
||||
const char **dptr, unsigned int *datalen)
|
||||
{
|
||||
|
|
@ -152,16 +172,18 @@ static unsigned int ip_nat_sip(struct sk_buff *skb, unsigned int protoff,
|
|||
hdr, NULL, &matchoff, &matchlen,
|
||||
&addr, &port) > 0) {
|
||||
unsigned int olen, matchend, poff, plen, buflen, n;
|
||||
char buffer[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
|
||||
char buffer[INET6_ADDRSTRLEN + sizeof("[]:nnnnn")];
|
||||
|
||||
/* We're only interested in headers related to this
|
||||
* connection */
|
||||
if (request) {
|
||||
if (addr.ip != ct->tuplehash[dir].tuple.src.u3.ip ||
|
||||
if (!nf_inet_addr_cmp(&addr,
|
||||
&ct->tuplehash[dir].tuple.src.u3) ||
|
||||
port != ct->tuplehash[dir].tuple.src.u.udp.port)
|
||||
goto next;
|
||||
} else {
|
||||
if (addr.ip != ct->tuplehash[dir].tuple.dst.u3.ip ||
|
||||
if (!nf_inet_addr_cmp(&addr,
|
||||
&ct->tuplehash[dir].tuple.dst.u3) ||
|
||||
port != ct->tuplehash[dir].tuple.dst.u.udp.port)
|
||||
goto next;
|
||||
}
|
||||
|
|
@ -178,10 +200,11 @@ static unsigned int ip_nat_sip(struct sk_buff *skb, unsigned int protoff,
|
|||
if (ct_sip_parse_address_param(ct, *dptr, matchend, *datalen,
|
||||
"maddr=", &poff, &plen,
|
||||
&addr, true) > 0 &&
|
||||
addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
|
||||
addr.ip != ct->tuplehash[!dir].tuple.dst.u3.ip) {
|
||||
buflen = sprintf(buffer, "%pI4",
|
||||
&ct->tuplehash[!dir].tuple.dst.u3.ip);
|
||||
nf_inet_addr_cmp(&addr, &ct->tuplehash[dir].tuple.src.u3) &&
|
||||
!nf_inet_addr_cmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3)) {
|
||||
buflen = sip_sprintf_addr(ct, buffer,
|
||||
&ct->tuplehash[!dir].tuple.dst.u3,
|
||||
true);
|
||||
if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
|
||||
poff, plen, buffer, buflen))
|
||||
return NF_DROP;
|
||||
|
|
@ -192,10 +215,11 @@ static unsigned int ip_nat_sip(struct sk_buff *skb, unsigned int protoff,
|
|||
if (ct_sip_parse_address_param(ct, *dptr, matchend, *datalen,
|
||||
"received=", &poff, &plen,
|
||||
&addr, false) > 0 &&
|
||||
addr.ip == ct->tuplehash[dir].tuple.dst.u3.ip &&
|
||||
addr.ip != ct->tuplehash[!dir].tuple.src.u3.ip) {
|
||||
buflen = sprintf(buffer, "%pI4",
|
||||
&ct->tuplehash[!dir].tuple.src.u3.ip);
|
||||
nf_inet_addr_cmp(&addr, &ct->tuplehash[dir].tuple.dst.u3) &&
|
||||
!nf_inet_addr_cmp(&addr, &ct->tuplehash[!dir].tuple.src.u3)) {
|
||||
buflen = sip_sprintf_addr(ct, buffer,
|
||||
&ct->tuplehash[!dir].tuple.src.u3,
|
||||
false);
|
||||
if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
|
||||
poff, plen, buffer, buflen))
|
||||
return NF_DROP;
|
||||
|
|
@ -237,7 +261,8 @@ static unsigned int ip_nat_sip(struct sk_buff *skb, unsigned int protoff,
|
|||
return NF_ACCEPT;
|
||||
}
|
||||
|
||||
static void ip_nat_sip_seq_adjust(struct sk_buff *skb, s16 off)
|
||||
static void nf_nat_sip_seq_adjust(struct sk_buff *skb, unsigned int protoff,
|
||||
s16 off)
|
||||
{
|
||||
enum ip_conntrack_info ctinfo;
|
||||
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
|
||||
|
|
@ -246,12 +271,12 @@ static void ip_nat_sip_seq_adjust(struct sk_buff *skb, s16 off)
|
|||
if (nf_ct_protonum(ct) != IPPROTO_TCP || off == 0)
|
||||
return;
|
||||
|
||||
th = (struct tcphdr *)(skb->data + ip_hdrlen(skb));
|
||||
th = (struct tcphdr *)(skb->data + protoff);
|
||||
nf_nat_set_seq_adjust(ct, ctinfo, th->seq, off);
|
||||
}
|
||||
|
||||
/* Handles expected signalling connections and media streams */
|
||||
static void ip_nat_sip_expected(struct nf_conn *ct,
|
||||
static void nf_nat_sip_expected(struct nf_conn *ct,
|
||||
struct nf_conntrack_expect *exp)
|
||||
{
|
||||
struct nf_nat_range range;
|
||||
|
|
@ -267,8 +292,8 @@ static void ip_nat_sip_expected(struct nf_conn *ct,
|
|||
|
||||
/* Change src to where master sends to, but only if the connection
|
||||
* actually came from the same source. */
|
||||
if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip ==
|
||||
ct->master->tuplehash[exp->dir].tuple.src.u3.ip) {
|
||||
if (nf_inet_addr_cmp(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3,
|
||||
&ct->master->tuplehash[exp->dir].tuple.src.u3)) {
|
||||
range.flags = NF_NAT_RANGE_MAP_IPS;
|
||||
range.min_addr = range.max_addr
|
||||
= ct->master->tuplehash[!exp->dir].tuple.dst.u3;
|
||||
|
|
@ -276,7 +301,7 @@ static void ip_nat_sip_expected(struct nf_conn *ct,
|
|||
}
|
||||
}
|
||||
|
||||
static unsigned int ip_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
|
||||
static unsigned int nf_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
|
||||
unsigned int dataoff,
|
||||
const char **dptr, unsigned int *datalen,
|
||||
struct nf_conntrack_expect *exp,
|
||||
|
|
@ -286,16 +311,17 @@ static unsigned int ip_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
|
|||
enum ip_conntrack_info ctinfo;
|
||||
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
|
||||
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
||||
__be32 newip;
|
||||
union nf_inet_addr newaddr;
|
||||
u_int16_t port;
|
||||
char buffer[sizeof("nnn.nnn.nnn.nnn:nnnnn")];
|
||||
char buffer[INET6_ADDRSTRLEN + sizeof("[]:nnnnn")];
|
||||
unsigned int buflen;
|
||||
|
||||
/* Connection will come from reply */
|
||||
if (ct->tuplehash[dir].tuple.src.u3.ip == ct->tuplehash[!dir].tuple.dst.u3.ip)
|
||||
newip = exp->tuple.dst.u3.ip;
|
||||
if (nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
|
||||
&ct->tuplehash[!dir].tuple.dst.u3))
|
||||
newaddr = exp->tuple.dst.u3;
|
||||
else
|
||||
newip = ct->tuplehash[!dir].tuple.dst.u3.ip;
|
||||
newaddr = ct->tuplehash[!dir].tuple.dst.u3;
|
||||
|
||||
/* If the signalling port matches the connection's source port in the
|
||||
* original direction, try to use the destination port in the opposite
|
||||
|
|
@ -307,10 +333,10 @@ static unsigned int ip_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
|
|||
port = ntohs(exp->tuple.dst.u.udp.port);
|
||||
|
||||
exp->saved_addr = exp->tuple.dst.u3;
|
||||
exp->tuple.dst.u3.ip = newip;
|
||||
exp->tuple.dst.u3 = newaddr;
|
||||
exp->saved_proto.udp.port = exp->tuple.dst.u.udp.port;
|
||||
exp->dir = !dir;
|
||||
exp->expectfn = ip_nat_sip_expected;
|
||||
exp->expectfn = nf_nat_sip_expected;
|
||||
|
||||
for (; port != 0; port++) {
|
||||
int ret;
|
||||
|
|
@ -328,9 +354,9 @@ static unsigned int ip_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
|
|||
if (port == 0)
|
||||
return NF_DROP;
|
||||
|
||||
if (exp->tuple.dst.u3.ip != exp->saved_addr.ip ||
|
||||
if (!nf_inet_addr_cmp(&exp->tuple.dst.u3, &exp->saved_addr) ||
|
||||
exp->tuple.dst.u.udp.port != exp->saved_proto.udp.port) {
|
||||
buflen = sprintf(buffer, "%pI4:%u", &newip, port);
|
||||
buflen = sip_sprintf_addr_port(ct, buffer, &newaddr, port);
|
||||
if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
|
||||
matchoff, matchlen, buffer, buflen))
|
||||
goto err;
|
||||
|
|
@ -388,7 +414,7 @@ static int mangle_sdp_packet(struct sk_buff *skb, unsigned int protoff,
|
|||
matchoff, matchlen, buffer, buflen) ? 0 : -EINVAL;
|
||||
}
|
||||
|
||||
static unsigned int ip_nat_sdp_addr(struct sk_buff *skb, unsigned int protoff,
|
||||
static unsigned int nf_nat_sdp_addr(struct sk_buff *skb, unsigned int protoff,
|
||||
unsigned int dataoff,
|
||||
const char **dptr, unsigned int *datalen,
|
||||
unsigned int sdpoff,
|
||||
|
|
@ -396,10 +422,12 @@ static unsigned int ip_nat_sdp_addr(struct sk_buff *skb, unsigned int protoff,
|
|||
enum sdp_header_types term,
|
||||
const union nf_inet_addr *addr)
|
||||
{
|
||||
char buffer[sizeof("nnn.nnn.nnn.nnn")];
|
||||
enum ip_conntrack_info ctinfo;
|
||||
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
|
||||
char buffer[INET6_ADDRSTRLEN];
|
||||
unsigned int buflen;
|
||||
|
||||
buflen = sprintf(buffer, "%pI4", &addr->ip);
|
||||
buflen = sip_sprintf_addr(ct, buffer, addr, false);
|
||||
if (mangle_sdp_packet(skb, protoff, dataoff, dptr, datalen,
|
||||
sdpoff, type, term, buffer, buflen))
|
||||
return 0;
|
||||
|
|
@ -407,7 +435,7 @@ static unsigned int ip_nat_sdp_addr(struct sk_buff *skb, unsigned int protoff,
|
|||
return mangle_content_len(skb, protoff, dataoff, dptr, datalen);
|
||||
}
|
||||
|
||||
static unsigned int ip_nat_sdp_port(struct sk_buff *skb, unsigned int protoff,
|
||||
static unsigned int nf_nat_sdp_port(struct sk_buff *skb, unsigned int protoff,
|
||||
unsigned int dataoff,
|
||||
const char **dptr, unsigned int *datalen,
|
||||
unsigned int matchoff,
|
||||
|
|
@ -425,24 +453,25 @@ static unsigned int ip_nat_sdp_port(struct sk_buff *skb, unsigned int protoff,
|
|||
return mangle_content_len(skb, protoff, dataoff, dptr, datalen);
|
||||
}
|
||||
|
||||
static unsigned int ip_nat_sdp_session(struct sk_buff *skb, unsigned int protoff,
|
||||
static unsigned int nf_nat_sdp_session(struct sk_buff *skb, unsigned int protoff,
|
||||
unsigned int dataoff,
|
||||
const char **dptr, unsigned int *datalen,
|
||||
unsigned int sdpoff,
|
||||
const union nf_inet_addr *addr)
|
||||
{
|
||||
char buffer[sizeof("nnn.nnn.nnn.nnn")];
|
||||
enum ip_conntrack_info ctinfo;
|
||||
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
|
||||
char buffer[INET6_ADDRSTRLEN];
|
||||
unsigned int buflen;
|
||||
|
||||
/* Mangle session description owner and contact addresses */
|
||||
buflen = sprintf(buffer, "%pI4", &addr->ip);
|
||||
buflen = sip_sprintf_addr(ct, buffer, addr, false);
|
||||
if (mangle_sdp_packet(skb, protoff, dataoff, dptr, datalen, sdpoff,
|
||||
SDP_HDR_OWNER_IP4, SDP_HDR_MEDIA,
|
||||
buffer, buflen))
|
||||
SDP_HDR_OWNER, SDP_HDR_MEDIA, buffer, buflen))
|
||||
return 0;
|
||||
|
||||
switch (mangle_sdp_packet(skb, protoff, dataoff, dptr, datalen, sdpoff,
|
||||
SDP_HDR_CONNECTION_IP4, SDP_HDR_MEDIA,
|
||||
SDP_HDR_CONNECTION, SDP_HDR_MEDIA,
|
||||
buffer, buflen)) {
|
||||
case 0:
|
||||
/*
|
||||
|
|
@ -463,7 +492,7 @@ static unsigned int ip_nat_sdp_session(struct sk_buff *skb, unsigned int protoff
|
|||
|
||||
/* So, this packet has hit the connection tracking matching code.
|
||||
Mangle it, and change the expectation to match the new version. */
|
||||
static unsigned int ip_nat_sdp_media(struct sk_buff *skb, unsigned int protoff,
|
||||
static unsigned int nf_nat_sdp_media(struct sk_buff *skb, unsigned int protoff,
|
||||
unsigned int dataoff,
|
||||
const char **dptr, unsigned int *datalen,
|
||||
struct nf_conntrack_expect *rtp_exp,
|
||||
|
|
@ -478,23 +507,23 @@ static unsigned int ip_nat_sdp_media(struct sk_buff *skb, unsigned int protoff,
|
|||
u_int16_t port;
|
||||
|
||||
/* Connection will come from reply */
|
||||
if (ct->tuplehash[dir].tuple.src.u3.ip ==
|
||||
ct->tuplehash[!dir].tuple.dst.u3.ip)
|
||||
rtp_addr->ip = rtp_exp->tuple.dst.u3.ip;
|
||||
if (nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
|
||||
&ct->tuplehash[!dir].tuple.dst.u3))
|
||||
*rtp_addr = rtp_exp->tuple.dst.u3;
|
||||
else
|
||||
rtp_addr->ip = ct->tuplehash[!dir].tuple.dst.u3.ip;
|
||||
*rtp_addr = ct->tuplehash[!dir].tuple.dst.u3;
|
||||
|
||||
rtp_exp->saved_addr = rtp_exp->tuple.dst.u3;
|
||||
rtp_exp->tuple.dst.u3.ip = rtp_addr->ip;
|
||||
rtp_exp->tuple.dst.u3 = *rtp_addr;
|
||||
rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port;
|
||||
rtp_exp->dir = !dir;
|
||||
rtp_exp->expectfn = ip_nat_sip_expected;
|
||||
rtp_exp->expectfn = nf_nat_sip_expected;
|
||||
|
||||
rtcp_exp->saved_addr = rtcp_exp->tuple.dst.u3;
|
||||
rtcp_exp->tuple.dst.u3.ip = rtp_addr->ip;
|
||||
rtcp_exp->tuple.dst.u3 = *rtp_addr;
|
||||
rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port;
|
||||
rtcp_exp->dir = !dir;
|
||||
rtcp_exp->expectfn = ip_nat_sip_expected;
|
||||
rtcp_exp->expectfn = nf_nat_sip_expected;
|
||||
|
||||
/* Try to get same pair of ports: if not, try to change them. */
|
||||
for (port = ntohs(rtp_exp->tuple.dst.u.udp.port);
|
||||
|
|
@ -525,7 +554,7 @@ static unsigned int ip_nat_sdp_media(struct sk_buff *skb, unsigned int protoff,
|
|||
|
||||
/* Update media port. */
|
||||
if (rtp_exp->tuple.dst.u.udp.port != rtp_exp->saved_proto.udp.port &&
|
||||
!ip_nat_sdp_port(skb, protoff, dataoff, dptr, datalen,
|
||||
!nf_nat_sdp_port(skb, protoff, dataoff, dptr, datalen,
|
||||
mediaoff, medialen, port))
|
||||
goto err2;
|
||||
|
||||
|
|
@ -539,8 +568,8 @@ static unsigned int ip_nat_sdp_media(struct sk_buff *skb, unsigned int protoff,
|
|||
}
|
||||
|
||||
static struct nf_ct_helper_expectfn sip_nat = {
|
||||
.name = "sip",
|
||||
.expectfn = ip_nat_sip_expected,
|
||||
.name = "sip",
|
||||
.expectfn = nf_nat_sip_expected,
|
||||
};
|
||||
|
||||
static void __exit nf_nat_sip_fini(void)
|
||||
|
|
@ -565,13 +594,13 @@ static int __init nf_nat_sip_init(void)
|
|||
BUG_ON(nf_nat_sdp_port_hook != NULL);
|
||||
BUG_ON(nf_nat_sdp_session_hook != NULL);
|
||||
BUG_ON(nf_nat_sdp_media_hook != NULL);
|
||||
RCU_INIT_POINTER(nf_nat_sip_hook, ip_nat_sip);
|
||||
RCU_INIT_POINTER(nf_nat_sip_seq_adjust_hook, ip_nat_sip_seq_adjust);
|
||||
RCU_INIT_POINTER(nf_nat_sip_expect_hook, ip_nat_sip_expect);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_addr_hook, ip_nat_sdp_addr);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_port_hook, ip_nat_sdp_port);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_session_hook, ip_nat_sdp_session);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_media_hook, ip_nat_sdp_media);
|
||||
RCU_INIT_POINTER(nf_nat_sip_hook, nf_nat_sip);
|
||||
RCU_INIT_POINTER(nf_nat_sip_seq_adjust_hook, nf_nat_sip_seq_adjust);
|
||||
RCU_INIT_POINTER(nf_nat_sip_expect_hook, nf_nat_sip_expect);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_addr_hook, nf_nat_sdp_addr);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_port_hook, nf_nat_sdp_port);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_session_hook, nf_nat_sdp_session);
|
||||
RCU_INIT_POINTER(nf_nat_sdp_media_hook, nf_nat_sdp_media);
|
||||
nf_ct_helper_expectfn_register(&sip_nat);
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in a new issue