| /* |
| * H.323 extension for NAT alteration. |
| * |
| * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net> |
| * |
| * This source code is licensed under General Public License version 2. |
| * |
| * Based on the 'brute force' H.323 NAT module by |
| * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/tcp.h> |
| #include <net/tcp.h> |
| |
| #include <net/netfilter/nf_nat.h> |
| #include <net/netfilter/nf_nat_helper.h> |
| #include <net/netfilter/nf_nat_rule.h> |
| #include <net/netfilter/nf_conntrack_helper.h> |
| #include <net/netfilter/nf_conntrack_expect.h> |
| #include <linux/netfilter/nf_conntrack_h323.h> |
| |
| /****************************************************************************/ |
| static int set_addr(struct sk_buff *skb, |
| unsigned char **data, int dataoff, |
| unsigned int addroff, __be32 ip, __be16 port) |
| { |
| enum ip_conntrack_info ctinfo; |
| struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
| struct { |
| __be32 ip; |
| __be16 port; |
| } __attribute__ ((__packed__)) buf; |
| struct tcphdr _tcph, *th; |
| |
| buf.ip = ip; |
| buf.port = port; |
| addroff += dataoff; |
| |
| if (ip_hdr(skb)->protocol == IPPROTO_TCP) { |
| if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo, |
| addroff, sizeof(buf), |
| (char *) &buf, sizeof(buf))) { |
| if (net_ratelimit()) |
| printk("nf_nat_h323: nf_nat_mangle_tcp_packet" |
| " error\n"); |
| return -1; |
| } |
| |
| /* Relocate data pointer */ |
| th = skb_header_pointer(skb, ip_hdrlen(skb), |
| sizeof(_tcph), &_tcph); |
| if (th == NULL) |
| return -1; |
| *data = skb->data + ip_hdrlen(skb) + th->doff * 4 + dataoff; |
| } else { |
| if (!nf_nat_mangle_udp_packet(skb, ct, ctinfo, |
| addroff, sizeof(buf), |
| (char *) &buf, sizeof(buf))) { |
| if (net_ratelimit()) |
| printk("nf_nat_h323: nf_nat_mangle_udp_packet" |
| " error\n"); |
| return -1; |
| } |
| /* nf_nat_mangle_udp_packet uses skb_make_writable() to copy |
| * or pull everything in a linear buffer, so we can safely |
| * use the skb pointers now */ |
| *data = skb->data + ip_hdrlen(skb) + sizeof(struct udphdr); |
| } |
| |
| return 0; |
| } |
| |
| /****************************************************************************/ |
| static int set_h225_addr(struct sk_buff *skb, |
| unsigned char **data, int dataoff, |
| TransportAddress *taddr, |
| union nf_conntrack_address *addr, __be16 port) |
| { |
| return set_addr(skb, data, dataoff, taddr->ipAddress.ip, |
| addr->ip, port); |
| } |
| |
| /****************************************************************************/ |
| static int set_h245_addr(struct sk_buff *skb, |
| unsigned char **data, int dataoff, |
| H245_TransportAddress *taddr, |
| union nf_conntrack_address *addr, __be16 port) |
| { |
| return set_addr(skb, data, dataoff, |
| taddr->unicastAddress.iPAddress.network, |
| addr->ip, port); |
| } |
| |
| /****************************************************************************/ |
| static int set_sig_addr(struct sk_buff *skb, struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned char **data, |
| TransportAddress *taddr, int count) |
| { |
| struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| int dir = CTINFO2DIR(ctinfo); |
| int i; |
| __be16 port; |
| union nf_conntrack_address addr; |
| |
| for (i = 0; i < count; i++) { |
| if (get_h225_addr(ct, *data, &taddr[i], &addr, &port)) { |
| if (addr.ip == ct->tuplehash[dir].tuple.src.u3.ip && |
| port == info->sig_port[dir]) { |
| /* GW->GK */ |
| |
| /* Fix for Gnomemeeting */ |
| if (i > 0 && |
| get_h225_addr(ct, *data, &taddr[0], |
| &addr, &port) && |
| (ntohl(addr.ip) & 0xff000000) == 0x7f000000) |
| i = 0; |
| |
| pr_debug("nf_nat_ras: set signal address " |
| "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n", |
| NIPQUAD(addr.ip), port, |
| NIPQUAD(ct->tuplehash[!dir].tuple.dst.u3.ip), |
| info->sig_port[!dir]); |
| return set_h225_addr(skb, data, 0, &taddr[i], |
| &ct->tuplehash[!dir]. |
| tuple.dst.u3, |
| info->sig_port[!dir]); |
| } else if (addr.ip == ct->tuplehash[dir].tuple.dst.u3.ip && |
| port == info->sig_port[dir]) { |
| /* GK->GW */ |
| pr_debug("nf_nat_ras: set signal address " |
| "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n", |
| NIPQUAD(addr.ip), port, |
| NIPQUAD(ct->tuplehash[!dir].tuple.src.u3.ip), |
| info->sig_port[!dir]); |
| return set_h225_addr(skb, data, 0, &taddr[i], |
| &ct->tuplehash[!dir]. |
| tuple.src.u3, |
| info->sig_port[!dir]); |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| /****************************************************************************/ |
| static int set_ras_addr(struct sk_buff *skb, struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned char **data, |
| TransportAddress *taddr, int count) |
| { |
| int dir = CTINFO2DIR(ctinfo); |
| int i; |
| __be16 port; |
| union nf_conntrack_address addr; |
| |
| for (i = 0; i < count; i++) { |
| if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && |
| addr.ip == ct->tuplehash[dir].tuple.src.u3.ip && |
| port == ct->tuplehash[dir].tuple.src.u.udp.port) { |
| pr_debug("nf_nat_ras: set rasAddress " |
| "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n", |
| NIPQUAD(addr.ip), ntohs(port), |
| NIPQUAD(ct->tuplehash[!dir].tuple.dst.u3.ip), |
| ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.port)); |
| return set_h225_addr(skb, data, 0, &taddr[i], |
| &ct->tuplehash[!dir].tuple.dst.u3, |
| ct->tuplehash[!dir].tuple. |
| dst.u.udp.port); |
| } |
| } |
| |
| return 0; |
| } |
| |
| /****************************************************************************/ |
| static int nat_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned char **data, int dataoff, |
| H245_TransportAddress *taddr, |
| __be16 port, __be16 rtp_port, |
| struct nf_conntrack_expect *rtp_exp, |
| struct nf_conntrack_expect *rtcp_exp) |
| { |
| struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| int dir = CTINFO2DIR(ctinfo); |
| int i; |
| u_int16_t nated_port; |
| |
| /* Set expectations for NAT */ |
| rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port; |
| rtp_exp->expectfn = nf_nat_follow_master; |
| rtp_exp->dir = !dir; |
| rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port; |
| rtcp_exp->expectfn = nf_nat_follow_master; |
| rtcp_exp->dir = !dir; |
| |
| /* Lookup existing expects */ |
| for (i = 0; i < H323_RTP_CHANNEL_MAX; i++) { |
| if (info->rtp_port[i][dir] == rtp_port) { |
| /* Expected */ |
| |
| /* Use allocated ports first. This will refresh |
| * the expects */ |
| rtp_exp->tuple.dst.u.udp.port = info->rtp_port[i][dir]; |
| rtcp_exp->tuple.dst.u.udp.port = |
| htons(ntohs(info->rtp_port[i][dir]) + 1); |
| break; |
| } else if (info->rtp_port[i][dir] == 0) { |
| /* Not expected */ |
| break; |
| } |
| } |
| |
| /* Run out of expectations */ |
| if (i >= H323_RTP_CHANNEL_MAX) { |
| if (net_ratelimit()) |
| printk("nf_nat_h323: out of expectations\n"); |
| return 0; |
| } |
| |
| /* Try to get a pair of ports. */ |
| for (nated_port = ntohs(rtp_exp->tuple.dst.u.udp.port); |
| nated_port != 0; nated_port += 2) { |
| rtp_exp->tuple.dst.u.udp.port = htons(nated_port); |
| if (nf_ct_expect_related(rtp_exp) == 0) { |
| rtcp_exp->tuple.dst.u.udp.port = |
| htons(nated_port + 1); |
| if (nf_ct_expect_related(rtcp_exp) == 0) |
| break; |
| nf_ct_unexpect_related(rtp_exp); |
| } |
| } |
| |
| if (nated_port == 0) { /* No port available */ |
| if (net_ratelimit()) |
| printk("nf_nat_h323: out of RTP ports\n"); |
| return 0; |
| } |
| |
| /* Modify signal */ |
| if (set_h245_addr(skb, data, dataoff, taddr, |
| &ct->tuplehash[!dir].tuple.dst.u3, |
| htons((port & htons(1)) ? nated_port + 1 : |
| nated_port)) == 0) { |
| /* Save ports */ |
| info->rtp_port[i][dir] = rtp_port; |
| info->rtp_port[i][!dir] = htons(nated_port); |
| } else { |
| nf_ct_unexpect_related(rtp_exp); |
| nf_ct_unexpect_related(rtcp_exp); |
| return -1; |
| } |
| |
| /* Success */ |
| pr_debug("nf_nat_h323: expect RTP %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n", |
| NIPQUAD(rtp_exp->tuple.src.u3.ip), |
| ntohs(rtp_exp->tuple.src.u.udp.port), |
| NIPQUAD(rtp_exp->tuple.dst.u3.ip), |
| ntohs(rtp_exp->tuple.dst.u.udp.port)); |
| pr_debug("nf_nat_h323: expect RTCP %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n", |
| NIPQUAD(rtcp_exp->tuple.src.u3.ip), |
| ntohs(rtcp_exp->tuple.src.u.udp.port), |
| NIPQUAD(rtcp_exp->tuple.dst.u3.ip), |
| ntohs(rtcp_exp->tuple.dst.u.udp.port)); |
| |
| return 0; |
| } |
| |
| /****************************************************************************/ |
| static int nat_t120(struct sk_buff *skb, struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned char **data, int dataoff, |
| H245_TransportAddress *taddr, __be16 port, |
| struct nf_conntrack_expect *exp) |
| { |
| int dir = CTINFO2DIR(ctinfo); |
| u_int16_t nated_port = ntohs(port); |
| |
| /* Set expectations for NAT */ |
| exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port; |
| exp->expectfn = nf_nat_follow_master; |
| exp->dir = !dir; |
| |
| /* Try to get same port: if not, try to change it. */ |
| for (; nated_port != 0; nated_port++) { |
| exp->tuple.dst.u.tcp.port = htons(nated_port); |
| if (nf_ct_expect_related(exp) == 0) |
| break; |
| } |
| |
| if (nated_port == 0) { /* No port available */ |
| if (net_ratelimit()) |
| printk("nf_nat_h323: out of TCP ports\n"); |
| return 0; |
| } |
| |
| /* Modify signal */ |
| if (set_h245_addr(skb, data, dataoff, taddr, |
| &ct->tuplehash[!dir].tuple.dst.u3, |
| htons(nated_port)) < 0) { |
| nf_ct_unexpect_related(exp); |
| return -1; |
| } |
| |
| pr_debug("nf_nat_h323: expect T.120 %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n", |
| NIPQUAD(exp->tuple.src.u3.ip), |
| ntohs(exp->tuple.src.u.tcp.port), |
| NIPQUAD(exp->tuple.dst.u3.ip), |
| ntohs(exp->tuple.dst.u.tcp.port)); |
| |
| return 0; |
| } |
| |
| /****************************************************************************/ |
| static int nat_h245(struct sk_buff *skb, struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned char **data, int dataoff, |
| TransportAddress *taddr, __be16 port, |
| struct nf_conntrack_expect *exp) |
| { |
| struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| int dir = CTINFO2DIR(ctinfo); |
| u_int16_t nated_port = ntohs(port); |
| |
| /* Set expectations for NAT */ |
| exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port; |
| exp->expectfn = nf_nat_follow_master; |
| exp->dir = !dir; |
| |
| /* Check existing expects */ |
| if (info->sig_port[dir] == port) |
| nated_port = ntohs(info->sig_port[!dir]); |
| |
| /* Try to get same port: if not, try to change it. */ |
| for (; nated_port != 0; nated_port++) { |
| exp->tuple.dst.u.tcp.port = htons(nated_port); |
| if (nf_ct_expect_related(exp) == 0) |
| break; |
| } |
| |
| if (nated_port == 0) { /* No port available */ |
| if (net_ratelimit()) |
| printk("nf_nat_q931: out of TCP ports\n"); |
| return 0; |
| } |
| |
| /* Modify signal */ |
| if (set_h225_addr(skb, data, dataoff, taddr, |
| &ct->tuplehash[!dir].tuple.dst.u3, |
| htons(nated_port)) == 0) { |
| /* Save ports */ |
| info->sig_port[dir] = port; |
| info->sig_port[!dir] = htons(nated_port); |
| } else { |
| nf_ct_unexpect_related(exp); |
| return -1; |
| } |
| |
| pr_debug("nf_nat_q931: expect H.245 %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n", |
| NIPQUAD(exp->tuple.src.u3.ip), |
| ntohs(exp->tuple.src.u.tcp.port), |
| NIPQUAD(exp->tuple.dst.u3.ip), |
| ntohs(exp->tuple.dst.u.tcp.port)); |
| |
| return 0; |
| } |
| |
| /**************************************************************************** |
| * This conntrack expect function replaces nf_conntrack_q931_expect() |
| * which was set by nf_conntrack_h323.c. |
| ****************************************************************************/ |
| static void ip_nat_q931_expect(struct nf_conn *new, |
| struct nf_conntrack_expect *this) |
| { |
| struct nf_nat_range range; |
| |
| if (this->tuple.src.u3.ip != 0) { /* Only accept calls from GK */ |
| nf_nat_follow_master(new, this); |
| return; |
| } |
| |
| /* This must be a fresh one. */ |
| BUG_ON(new->status & IPS_NAT_DONE_MASK); |
| |
| /* Change src to where master sends to */ |
| range.flags = IP_NAT_RANGE_MAP_IPS; |
| range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip; |
| |
| /* hook doesn't matter, but it has to do source manip */ |
| nf_nat_setup_info(new, &range, NF_IP_POST_ROUTING); |
| |
| /* For DST manip, map port here to where it's expected. */ |
| range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED); |
| range.min = range.max = this->saved_proto; |
| range.min_ip = range.max_ip = |
| new->master->tuplehash[!this->dir].tuple.src.u3.ip; |
| |
| /* hook doesn't matter, but it has to do destination manip */ |
| nf_nat_setup_info(new, &range, NF_IP_PRE_ROUTING); |
| } |
| |
| /****************************************************************************/ |
| static int nat_q931(struct sk_buff *skb, struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned char **data, TransportAddress *taddr, int idx, |
| __be16 port, struct nf_conntrack_expect *exp) |
| { |
| struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| int dir = CTINFO2DIR(ctinfo); |
| u_int16_t nated_port = ntohs(port); |
| union nf_conntrack_address addr; |
| |
| /* Set expectations for NAT */ |
| exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port; |
| exp->expectfn = ip_nat_q931_expect; |
| exp->dir = !dir; |
| |
| /* Check existing expects */ |
| if (info->sig_port[dir] == port) |
| nated_port = ntohs(info->sig_port[!dir]); |
| |
| /* Try to get same port: if not, try to change it. */ |
| for (; nated_port != 0; nated_port++) { |
| exp->tuple.dst.u.tcp.port = htons(nated_port); |
| if (nf_ct_expect_related(exp) == 0) |
| break; |
| } |
| |
| if (nated_port == 0) { /* No port available */ |
| if (net_ratelimit()) |
| printk("nf_nat_ras: out of TCP ports\n"); |
| return 0; |
| } |
| |
| /* Modify signal */ |
| if (set_h225_addr(skb, data, 0, &taddr[idx], |
| &ct->tuplehash[!dir].tuple.dst.u3, |
| htons(nated_port)) == 0) { |
| /* Save ports */ |
| info->sig_port[dir] = port; |
| info->sig_port[!dir] = htons(nated_port); |
| |
| /* Fix for Gnomemeeting */ |
| if (idx > 0 && |
| get_h225_addr(ct, *data, &taddr[0], &addr, &port) && |
| (ntohl(addr.ip) & 0xff000000) == 0x7f000000) { |
| set_h225_addr(skb, data, 0, &taddr[0], |
| &ct->tuplehash[!dir].tuple.dst.u3, |
| info->sig_port[!dir]); |
| } |
| } else { |
| nf_ct_unexpect_related(exp); |
| return -1; |
| } |
| |
| /* Success */ |
| pr_debug("nf_nat_ras: expect Q.931 %u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n", |
| NIPQUAD(exp->tuple.src.u3.ip), |
| ntohs(exp->tuple.src.u.tcp.port), |
| NIPQUAD(exp->tuple.dst.u3.ip), |
| ntohs(exp->tuple.dst.u.tcp.port)); |
| |
| return 0; |
| } |
| |
| /****************************************************************************/ |
| static void ip_nat_callforwarding_expect(struct nf_conn *new, |
| struct nf_conntrack_expect *this) |
| { |
| struct nf_nat_range range; |
| |
| /* This must be a fresh one. */ |
| BUG_ON(new->status & IPS_NAT_DONE_MASK); |
| |
| /* Change src to where master sends to */ |
| range.flags = IP_NAT_RANGE_MAP_IPS; |
| range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip; |
| |
| /* hook doesn't matter, but it has to do source manip */ |
| nf_nat_setup_info(new, &range, NF_IP_POST_ROUTING); |
| |
| /* For DST manip, map port here to where it's expected. */ |
| range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED); |
| range.min = range.max = this->saved_proto; |
| range.min_ip = range.max_ip = this->saved_ip; |
| |
| /* hook doesn't matter, but it has to do destination manip */ |
| nf_nat_setup_info(new, &range, NF_IP_PRE_ROUTING); |
| } |
| |
| /****************************************************************************/ |
| static int nat_callforwarding(struct sk_buff *skb, struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned char **data, int dataoff, |
| TransportAddress *taddr, __be16 port, |
| struct nf_conntrack_expect *exp) |
| { |
| int dir = CTINFO2DIR(ctinfo); |
| u_int16_t nated_port; |
| |
| /* Set expectations for NAT */ |
| exp->saved_ip = exp->tuple.dst.u3.ip; |
| exp->tuple.dst.u3.ip = ct->tuplehash[!dir].tuple.dst.u3.ip; |
| exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port; |
| exp->expectfn = ip_nat_callforwarding_expect; |
| exp->dir = !dir; |
| |
| /* Try to get same port: if not, try to change it. */ |
| for (nated_port = ntohs(port); nated_port != 0; nated_port++) { |
| exp->tuple.dst.u.tcp.port = htons(nated_port); |
| if (nf_ct_expect_related(exp) == 0) |
| break; |
| } |
| |
| if (nated_port == 0) { /* No port available */ |
| if (net_ratelimit()) |
| printk("nf_nat_q931: out of TCP ports\n"); |
| return 0; |
| } |
| |
| /* Modify signal */ |
| if (!set_h225_addr(skb, data, dataoff, taddr, |
| &ct->tuplehash[!dir].tuple.dst.u3, |
| htons(nated_port)) == 0) { |
| nf_ct_unexpect_related(exp); |
| return -1; |
| } |
| |
| /* Success */ |
| pr_debug("nf_nat_q931: expect Call Forwarding " |
| "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n", |
| NIPQUAD(exp->tuple.src.u3.ip), |
| ntohs(exp->tuple.src.u.tcp.port), |
| NIPQUAD(exp->tuple.dst.u3.ip), |
| ntohs(exp->tuple.dst.u.tcp.port)); |
| |
| return 0; |
| } |
| |
| /****************************************************************************/ |
| static int __init init(void) |
| { |
| BUG_ON(set_h245_addr_hook != NULL); |
| BUG_ON(set_h225_addr_hook != NULL); |
| BUG_ON(set_sig_addr_hook != NULL); |
| BUG_ON(set_ras_addr_hook != NULL); |
| BUG_ON(nat_rtp_rtcp_hook != NULL); |
| BUG_ON(nat_t120_hook != NULL); |
| BUG_ON(nat_h245_hook != NULL); |
| BUG_ON(nat_callforwarding_hook != NULL); |
| BUG_ON(nat_q931_hook != NULL); |
| |
| rcu_assign_pointer(set_h245_addr_hook, set_h245_addr); |
| rcu_assign_pointer(set_h225_addr_hook, set_h225_addr); |
| rcu_assign_pointer(set_sig_addr_hook, set_sig_addr); |
| rcu_assign_pointer(set_ras_addr_hook, set_ras_addr); |
| rcu_assign_pointer(nat_rtp_rtcp_hook, nat_rtp_rtcp); |
| rcu_assign_pointer(nat_t120_hook, nat_t120); |
| rcu_assign_pointer(nat_h245_hook, nat_h245); |
| rcu_assign_pointer(nat_callforwarding_hook, nat_callforwarding); |
| rcu_assign_pointer(nat_q931_hook, nat_q931); |
| return 0; |
| } |
| |
| /****************************************************************************/ |
| static void __exit fini(void) |
| { |
| rcu_assign_pointer(set_h245_addr_hook, NULL); |
| rcu_assign_pointer(set_h225_addr_hook, NULL); |
| rcu_assign_pointer(set_sig_addr_hook, NULL); |
| rcu_assign_pointer(set_ras_addr_hook, NULL); |
| rcu_assign_pointer(nat_rtp_rtcp_hook, NULL); |
| rcu_assign_pointer(nat_t120_hook, NULL); |
| rcu_assign_pointer(nat_h245_hook, NULL); |
| rcu_assign_pointer(nat_callforwarding_hook, NULL); |
| rcu_assign_pointer(nat_q931_hook, NULL); |
| synchronize_rcu(); |
| } |
| |
| /****************************************************************************/ |
| module_init(init); |
| module_exit(fini); |
| |
| MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); |
| MODULE_DESCRIPTION("H.323 NAT helper"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("ip_nat_h323"); |
