Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * H.323 extension for NAT alteration. |
| 3 | * |
| 4 | * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net> |
| 5 | * |
| 6 | * This source code is licensed under General Public License version 2. |
| 7 | * |
| 8 | * Based on the 'brute force' H.323 NAT module by |
| 9 | * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 13 | #include <linux/tcp.h> |
| 14 | #include <net/tcp.h> |
| 15 | |
| 16 | #include <net/netfilter/nf_nat.h> |
| 17 | #include <net/netfilter/nf_nat_helper.h> |
| 18 | #include <net/netfilter/nf_nat_rule.h> |
| 19 | #include <net/netfilter/nf_conntrack_helper.h> |
| 20 | #include <net/netfilter/nf_conntrack_expect.h> |
| 21 | #include <linux/netfilter/nf_conntrack_h323.h> |
| 22 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 23 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 24 | static int set_addr(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 25 | unsigned char **data, int dataoff, |
| 26 | unsigned int addroff, __be32 ip, __be16 port) |
| 27 | { |
| 28 | enum ip_conntrack_info ctinfo; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 29 | struct nf_conn *ct = nf_ct_get(skb, &ctinfo); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 30 | struct { |
| 31 | __be32 ip; |
| 32 | __be16 port; |
| 33 | } __attribute__ ((__packed__)) buf; |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 34 | const struct tcphdr *th; |
| 35 | struct tcphdr _tcph; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 36 | |
| 37 | buf.ip = ip; |
| 38 | buf.port = port; |
| 39 | addroff += dataoff; |
| 40 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 41 | if (ip_hdr(skb)->protocol == IPPROTO_TCP) { |
| 42 | if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 43 | addroff, sizeof(buf), |
| 44 | (char *) &buf, sizeof(buf))) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 45 | net_notice_ratelimited("nf_nat_h323: nf_nat_mangle_tcp_packet error\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 46 | return -1; |
| 47 | } |
| 48 | |
| 49 | /* Relocate data pointer */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 50 | th = skb_header_pointer(skb, ip_hdrlen(skb), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 51 | sizeof(_tcph), &_tcph); |
| 52 | if (th == NULL) |
| 53 | return -1; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 54 | *data = skb->data + ip_hdrlen(skb) + th->doff * 4 + dataoff; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 55 | } else { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 56 | if (!nf_nat_mangle_udp_packet(skb, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 57 | addroff, sizeof(buf), |
| 58 | (char *) &buf, sizeof(buf))) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 59 | net_notice_ratelimited("nf_nat_h323: nf_nat_mangle_udp_packet error\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 60 | return -1; |
| 61 | } |
| 62 | /* nf_nat_mangle_udp_packet uses skb_make_writable() to copy |
| 63 | * or pull everything in a linear buffer, so we can safely |
| 64 | * use the skb pointers now */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 65 | *data = skb->data + ip_hdrlen(skb) + sizeof(struct udphdr); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 72 | static int set_h225_addr(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 73 | unsigned char **data, int dataoff, |
| 74 | TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 75 | union nf_inet_addr *addr, __be16 port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 76 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 77 | return set_addr(skb, data, dataoff, taddr->ipAddress.ip, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 78 | addr->ip, port); |
| 79 | } |
| 80 | |
| 81 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 82 | static int set_h245_addr(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 83 | unsigned char **data, int dataoff, |
| 84 | H245_TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 85 | union nf_inet_addr *addr, __be16 port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 86 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 87 | return set_addr(skb, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 88 | taddr->unicastAddress.iPAddress.network, |
| 89 | addr->ip, port); |
| 90 | } |
| 91 | |
| 92 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 93 | static int set_sig_addr(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 94 | enum ip_conntrack_info ctinfo, |
| 95 | unsigned char **data, |
| 96 | TransportAddress *taddr, int count) |
| 97 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 98 | const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 99 | int dir = CTINFO2DIR(ctinfo); |
| 100 | int i; |
| 101 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 102 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 103 | |
| 104 | for (i = 0; i < count; i++) { |
| 105 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port)) { |
| 106 | if (addr.ip == ct->tuplehash[dir].tuple.src.u3.ip && |
| 107 | port == info->sig_port[dir]) { |
| 108 | /* GW->GK */ |
| 109 | |
| 110 | /* Fix for Gnomemeeting */ |
| 111 | if (i > 0 && |
| 112 | get_h225_addr(ct, *data, &taddr[0], |
| 113 | &addr, &port) && |
| 114 | (ntohl(addr.ip) & 0xff000000) == 0x7f000000) |
| 115 | i = 0; |
| 116 | |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 117 | pr_debug("nf_nat_ras: set signal address %pI4:%hu->%pI4:%hu\n", |
| 118 | &addr.ip, port, |
| 119 | &ct->tuplehash[!dir].tuple.dst.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 120 | info->sig_port[!dir]); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 121 | return set_h225_addr(skb, data, 0, &taddr[i], |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 122 | &ct->tuplehash[!dir]. |
| 123 | tuple.dst.u3, |
| 124 | info->sig_port[!dir]); |
| 125 | } else if (addr.ip == ct->tuplehash[dir].tuple.dst.u3.ip && |
| 126 | port == info->sig_port[dir]) { |
| 127 | /* GK->GW */ |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 128 | pr_debug("nf_nat_ras: set signal address %pI4:%hu->%pI4:%hu\n", |
| 129 | &addr.ip, port, |
| 130 | &ct->tuplehash[!dir].tuple.src.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 131 | info->sig_port[!dir]); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 132 | return set_h225_addr(skb, data, 0, &taddr[i], |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 133 | &ct->tuplehash[!dir]. |
| 134 | tuple.src.u3, |
| 135 | info->sig_port[!dir]); |
| 136 | } |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 144 | static int set_ras_addr(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 145 | enum ip_conntrack_info ctinfo, |
| 146 | unsigned char **data, |
| 147 | TransportAddress *taddr, int count) |
| 148 | { |
| 149 | int dir = CTINFO2DIR(ctinfo); |
| 150 | int i; |
| 151 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 152 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 153 | |
| 154 | for (i = 0; i < count; i++) { |
| 155 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && |
| 156 | addr.ip == ct->tuplehash[dir].tuple.src.u3.ip && |
| 157 | port == ct->tuplehash[dir].tuple.src.u.udp.port) { |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 158 | pr_debug("nf_nat_ras: set rasAddress %pI4:%hu->%pI4:%hu\n", |
| 159 | &addr.ip, ntohs(port), |
| 160 | &ct->tuplehash[!dir].tuple.dst.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 161 | ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.port)); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 162 | return set_h225_addr(skb, data, 0, &taddr[i], |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 163 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 164 | ct->tuplehash[!dir].tuple. |
| 165 | dst.u.udp.port); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 173 | static int nat_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 174 | enum ip_conntrack_info ctinfo, |
| 175 | unsigned char **data, int dataoff, |
| 176 | H245_TransportAddress *taddr, |
| 177 | __be16 port, __be16 rtp_port, |
| 178 | struct nf_conntrack_expect *rtp_exp, |
| 179 | struct nf_conntrack_expect *rtcp_exp) |
| 180 | { |
| 181 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 182 | int dir = CTINFO2DIR(ctinfo); |
| 183 | int i; |
| 184 | u_int16_t nated_port; |
| 185 | |
| 186 | /* Set expectations for NAT */ |
| 187 | rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port; |
| 188 | rtp_exp->expectfn = nf_nat_follow_master; |
| 189 | rtp_exp->dir = !dir; |
| 190 | rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port; |
| 191 | rtcp_exp->expectfn = nf_nat_follow_master; |
| 192 | rtcp_exp->dir = !dir; |
| 193 | |
| 194 | /* Lookup existing expects */ |
| 195 | for (i = 0; i < H323_RTP_CHANNEL_MAX; i++) { |
| 196 | if (info->rtp_port[i][dir] == rtp_port) { |
| 197 | /* Expected */ |
| 198 | |
| 199 | /* Use allocated ports first. This will refresh |
| 200 | * the expects */ |
| 201 | rtp_exp->tuple.dst.u.udp.port = info->rtp_port[i][dir]; |
| 202 | rtcp_exp->tuple.dst.u.udp.port = |
| 203 | htons(ntohs(info->rtp_port[i][dir]) + 1); |
| 204 | break; |
| 205 | } else if (info->rtp_port[i][dir] == 0) { |
| 206 | /* Not expected */ |
| 207 | break; |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | /* Run out of expectations */ |
| 212 | if (i >= H323_RTP_CHANNEL_MAX) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 213 | net_notice_ratelimited("nf_nat_h323: out of expectations\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | /* Try to get a pair of ports. */ |
| 218 | for (nated_port = ntohs(rtp_exp->tuple.dst.u.udp.port); |
| 219 | nated_port != 0; nated_port += 2) { |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 220 | int ret; |
| 221 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 222 | rtp_exp->tuple.dst.u.udp.port = htons(nated_port); |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 223 | ret = nf_ct_expect_related(rtp_exp); |
| 224 | if (ret == 0) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 225 | rtcp_exp->tuple.dst.u.udp.port = |
| 226 | htons(nated_port + 1); |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 227 | ret = nf_ct_expect_related(rtcp_exp); |
| 228 | if (ret == 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 229 | break; |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 230 | else if (ret != -EBUSY) { |
| 231 | nf_ct_unexpect_related(rtp_exp); |
| 232 | nated_port = 0; |
| 233 | break; |
| 234 | } |
| 235 | } else if (ret != -EBUSY) { |
| 236 | nated_port = 0; |
| 237 | break; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 238 | } |
| 239 | } |
| 240 | |
| 241 | if (nated_port == 0) { /* No port available */ |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 242 | net_notice_ratelimited("nf_nat_h323: out of RTP ports\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | /* Modify signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 247 | if (set_h245_addr(skb, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 248 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 249 | htons((port & htons(1)) ? nated_port + 1 : |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 250 | nated_port)) == 0) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 251 | /* Save ports */ |
| 252 | info->rtp_port[i][dir] = rtp_port; |
| 253 | info->rtp_port[i][!dir] = htons(nated_port); |
| 254 | } else { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 255 | nf_ct_unexpect_related(rtp_exp); |
| 256 | nf_ct_unexpect_related(rtcp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 257 | return -1; |
| 258 | } |
| 259 | |
| 260 | /* Success */ |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 261 | pr_debug("nf_nat_h323: expect RTP %pI4:%hu->%pI4:%hu\n", |
| 262 | &rtp_exp->tuple.src.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 263 | ntohs(rtp_exp->tuple.src.u.udp.port), |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 264 | &rtp_exp->tuple.dst.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 265 | ntohs(rtp_exp->tuple.dst.u.udp.port)); |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 266 | pr_debug("nf_nat_h323: expect RTCP %pI4:%hu->%pI4:%hu\n", |
| 267 | &rtcp_exp->tuple.src.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 268 | ntohs(rtcp_exp->tuple.src.u.udp.port), |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 269 | &rtcp_exp->tuple.dst.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 270 | ntohs(rtcp_exp->tuple.dst.u.udp.port)); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 276 | static int nat_t120(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 277 | enum ip_conntrack_info ctinfo, |
| 278 | unsigned char **data, int dataoff, |
| 279 | H245_TransportAddress *taddr, __be16 port, |
| 280 | struct nf_conntrack_expect *exp) |
| 281 | { |
| 282 | int dir = CTINFO2DIR(ctinfo); |
| 283 | u_int16_t nated_port = ntohs(port); |
| 284 | |
| 285 | /* Set expectations for NAT */ |
| 286 | exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port; |
| 287 | exp->expectfn = nf_nat_follow_master; |
| 288 | exp->dir = !dir; |
| 289 | |
| 290 | /* Try to get same port: if not, try to change it. */ |
| 291 | for (; nated_port != 0; nated_port++) { |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 292 | int ret; |
| 293 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 294 | exp->tuple.dst.u.tcp.port = htons(nated_port); |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 295 | ret = nf_ct_expect_related(exp); |
| 296 | if (ret == 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 297 | break; |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 298 | else if (ret != -EBUSY) { |
| 299 | nated_port = 0; |
| 300 | break; |
| 301 | } |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | if (nated_port == 0) { /* No port available */ |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 305 | net_notice_ratelimited("nf_nat_h323: out of TCP ports\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | /* Modify signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 310 | if (set_h245_addr(skb, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 311 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 312 | htons(nated_port)) < 0) { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 313 | nf_ct_unexpect_related(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 314 | return -1; |
| 315 | } |
| 316 | |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 317 | pr_debug("nf_nat_h323: expect T.120 %pI4:%hu->%pI4:%hu\n", |
| 318 | &exp->tuple.src.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 319 | ntohs(exp->tuple.src.u.tcp.port), |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 320 | &exp->tuple.dst.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 321 | ntohs(exp->tuple.dst.u.tcp.port)); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 322 | |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 327 | static int nat_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 328 | enum ip_conntrack_info ctinfo, |
| 329 | unsigned char **data, int dataoff, |
| 330 | TransportAddress *taddr, __be16 port, |
| 331 | struct nf_conntrack_expect *exp) |
| 332 | { |
| 333 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 334 | int dir = CTINFO2DIR(ctinfo); |
| 335 | u_int16_t nated_port = ntohs(port); |
| 336 | |
| 337 | /* Set expectations for NAT */ |
| 338 | exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port; |
| 339 | exp->expectfn = nf_nat_follow_master; |
| 340 | exp->dir = !dir; |
| 341 | |
| 342 | /* Check existing expects */ |
| 343 | if (info->sig_port[dir] == port) |
| 344 | nated_port = ntohs(info->sig_port[!dir]); |
| 345 | |
| 346 | /* Try to get same port: if not, try to change it. */ |
| 347 | for (; nated_port != 0; nated_port++) { |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 348 | int ret; |
| 349 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 350 | exp->tuple.dst.u.tcp.port = htons(nated_port); |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 351 | ret = nf_ct_expect_related(exp); |
| 352 | if (ret == 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 353 | break; |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 354 | else if (ret != -EBUSY) { |
| 355 | nated_port = 0; |
| 356 | break; |
| 357 | } |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | if (nated_port == 0) { /* No port available */ |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 361 | net_notice_ratelimited("nf_nat_q931: out of TCP ports\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | /* Modify signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 366 | if (set_h225_addr(skb, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 367 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 368 | htons(nated_port)) == 0) { |
| 369 | /* Save ports */ |
| 370 | info->sig_port[dir] = port; |
| 371 | info->sig_port[!dir] = htons(nated_port); |
| 372 | } else { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 373 | nf_ct_unexpect_related(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 374 | return -1; |
| 375 | } |
| 376 | |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 377 | pr_debug("nf_nat_q931: expect H.245 %pI4:%hu->%pI4:%hu\n", |
| 378 | &exp->tuple.src.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 379 | ntohs(exp->tuple.src.u.tcp.port), |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 380 | &exp->tuple.dst.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 381 | ntohs(exp->tuple.dst.u.tcp.port)); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | /**************************************************************************** |
| 387 | * This conntrack expect function replaces nf_conntrack_q931_expect() |
| 388 | * which was set by nf_conntrack_h323.c. |
| 389 | ****************************************************************************/ |
| 390 | static void ip_nat_q931_expect(struct nf_conn *new, |
| 391 | struct nf_conntrack_expect *this) |
| 392 | { |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 393 | struct nf_nat_ipv4_range range; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 394 | |
| 395 | if (this->tuple.src.u3.ip != 0) { /* Only accept calls from GK */ |
| 396 | nf_nat_follow_master(new, this); |
| 397 | return; |
| 398 | } |
| 399 | |
| 400 | /* This must be a fresh one. */ |
| 401 | BUG_ON(new->status & IPS_NAT_DONE_MASK); |
| 402 | |
| 403 | /* Change src to where master sends to */ |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 404 | range.flags = NF_NAT_RANGE_MAP_IPS; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 405 | range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip; |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 406 | nf_nat_setup_info(new, &range, NF_NAT_MANIP_SRC); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 407 | |
| 408 | /* For DST manip, map port here to where it's expected. */ |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 409 | range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 410 | range.min = range.max = this->saved_proto; |
| 411 | range.min_ip = range.max_ip = |
| 412 | new->master->tuplehash[!this->dir].tuple.src.u3.ip; |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 413 | nf_nat_setup_info(new, &range, NF_NAT_MANIP_DST); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 417 | static int nat_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 418 | enum ip_conntrack_info ctinfo, |
| 419 | unsigned char **data, TransportAddress *taddr, int idx, |
| 420 | __be16 port, struct nf_conntrack_expect *exp) |
| 421 | { |
| 422 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 423 | int dir = CTINFO2DIR(ctinfo); |
| 424 | u_int16_t nated_port = ntohs(port); |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 425 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 426 | |
| 427 | /* Set expectations for NAT */ |
| 428 | exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port; |
| 429 | exp->expectfn = ip_nat_q931_expect; |
| 430 | exp->dir = !dir; |
| 431 | |
| 432 | /* Check existing expects */ |
| 433 | if (info->sig_port[dir] == port) |
| 434 | nated_port = ntohs(info->sig_port[!dir]); |
| 435 | |
| 436 | /* Try to get same port: if not, try to change it. */ |
| 437 | for (; nated_port != 0; nated_port++) { |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 438 | int ret; |
| 439 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 440 | exp->tuple.dst.u.tcp.port = htons(nated_port); |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 441 | ret = nf_ct_expect_related(exp); |
| 442 | if (ret == 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 443 | break; |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 444 | else if (ret != -EBUSY) { |
| 445 | nated_port = 0; |
| 446 | break; |
| 447 | } |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | if (nated_port == 0) { /* No port available */ |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 451 | net_notice_ratelimited("nf_nat_ras: out of TCP ports\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | /* Modify signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 456 | if (set_h225_addr(skb, data, 0, &taddr[idx], |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 457 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 458 | htons(nated_port)) == 0) { |
| 459 | /* Save ports */ |
| 460 | info->sig_port[dir] = port; |
| 461 | info->sig_port[!dir] = htons(nated_port); |
| 462 | |
| 463 | /* Fix for Gnomemeeting */ |
| 464 | if (idx > 0 && |
| 465 | get_h225_addr(ct, *data, &taddr[0], &addr, &port) && |
| 466 | (ntohl(addr.ip) & 0xff000000) == 0x7f000000) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 467 | set_h225_addr(skb, data, 0, &taddr[0], |
Jing Min Zhao | 1ff75ed | 2007-05-24 16:44:40 -0700 | [diff] [blame] | 468 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 469 | info->sig_port[!dir]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 470 | } |
| 471 | } else { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 472 | nf_ct_unexpect_related(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 473 | return -1; |
| 474 | } |
| 475 | |
| 476 | /* Success */ |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 477 | pr_debug("nf_nat_ras: expect Q.931 %pI4:%hu->%pI4:%hu\n", |
| 478 | &exp->tuple.src.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 479 | ntohs(exp->tuple.src.u.tcp.port), |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 480 | &exp->tuple.dst.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 481 | ntohs(exp->tuple.dst.u.tcp.port)); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 482 | |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | /****************************************************************************/ |
| 487 | static void ip_nat_callforwarding_expect(struct nf_conn *new, |
| 488 | struct nf_conntrack_expect *this) |
| 489 | { |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 490 | struct nf_nat_ipv4_range range; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 491 | |
| 492 | /* This must be a fresh one. */ |
| 493 | BUG_ON(new->status & IPS_NAT_DONE_MASK); |
| 494 | |
| 495 | /* Change src to where master sends to */ |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 496 | range.flags = NF_NAT_RANGE_MAP_IPS; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 497 | range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip; |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 498 | nf_nat_setup_info(new, &range, NF_NAT_MANIP_SRC); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 499 | |
| 500 | /* For DST manip, map port here to where it's expected. */ |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 501 | range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 502 | range.min = range.max = this->saved_proto; |
| 503 | range.min_ip = range.max_ip = this->saved_ip; |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 504 | nf_nat_setup_info(new, &range, NF_NAT_MANIP_DST); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 508 | static int nat_callforwarding(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 509 | enum ip_conntrack_info ctinfo, |
| 510 | unsigned char **data, int dataoff, |
| 511 | TransportAddress *taddr, __be16 port, |
| 512 | struct nf_conntrack_expect *exp) |
| 513 | { |
| 514 | int dir = CTINFO2DIR(ctinfo); |
| 515 | u_int16_t nated_port; |
| 516 | |
| 517 | /* Set expectations for NAT */ |
| 518 | exp->saved_ip = exp->tuple.dst.u3.ip; |
| 519 | exp->tuple.dst.u3.ip = ct->tuplehash[!dir].tuple.dst.u3.ip; |
| 520 | exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port; |
| 521 | exp->expectfn = ip_nat_callforwarding_expect; |
| 522 | exp->dir = !dir; |
| 523 | |
| 524 | /* Try to get same port: if not, try to change it. */ |
| 525 | for (nated_port = ntohs(port); nated_port != 0; nated_port++) { |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 526 | int ret; |
| 527 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 528 | exp->tuple.dst.u.tcp.port = htons(nated_port); |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 529 | ret = nf_ct_expect_related(exp); |
| 530 | if (ret == 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 531 | break; |
Pablo Neira Ayuso | 5b92b61 | 2010-09-22 08:34:12 +0200 | [diff] [blame] | 532 | else if (ret != -EBUSY) { |
| 533 | nated_port = 0; |
| 534 | break; |
| 535 | } |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 536 | } |
| 537 | |
| 538 | if (nated_port == 0) { /* No port available */ |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 539 | net_notice_ratelimited("nf_nat_q931: out of TCP ports\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | /* Modify signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 544 | if (!set_h225_addr(skb, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 545 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 546 | htons(nated_port)) == 0) { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 547 | nf_ct_unexpect_related(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 548 | return -1; |
| 549 | } |
| 550 | |
| 551 | /* Success */ |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 552 | pr_debug("nf_nat_q931: expect Call Forwarding %pI4:%hu->%pI4:%hu\n", |
| 553 | &exp->tuple.src.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 554 | ntohs(exp->tuple.src.u.tcp.port), |
Harvey Harrison | cffee38 | 2008-10-31 00:53:08 -0700 | [diff] [blame] | 555 | &exp->tuple.dst.u3.ip, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 556 | ntohs(exp->tuple.dst.u.tcp.port)); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 557 | |
| 558 | return 0; |
| 559 | } |
| 560 | |
Pablo Neira Ayuso | 544d5c7 | 2012-02-05 03:44:51 +0100 | [diff] [blame] | 561 | static struct nf_ct_helper_expectfn q931_nat = { |
| 562 | .name = "Q.931", |
| 563 | .expectfn = ip_nat_q931_expect, |
| 564 | }; |
| 565 | |
| 566 | static struct nf_ct_helper_expectfn callforwarding_nat = { |
| 567 | .name = "callforwarding", |
| 568 | .expectfn = ip_nat_callforwarding_expect, |
| 569 | }; |
| 570 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 571 | /****************************************************************************/ |
| 572 | static int __init init(void) |
| 573 | { |
Patrick McHardy | d1332e0 | 2007-11-05 20:43:30 -0800 | [diff] [blame] | 574 | BUG_ON(set_h245_addr_hook != NULL); |
| 575 | BUG_ON(set_h225_addr_hook != NULL); |
| 576 | BUG_ON(set_sig_addr_hook != NULL); |
| 577 | BUG_ON(set_ras_addr_hook != NULL); |
| 578 | BUG_ON(nat_rtp_rtcp_hook != NULL); |
| 579 | BUG_ON(nat_t120_hook != NULL); |
| 580 | BUG_ON(nat_h245_hook != NULL); |
| 581 | BUG_ON(nat_callforwarding_hook != NULL); |
| 582 | BUG_ON(nat_q931_hook != NULL); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 583 | |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 584 | RCU_INIT_POINTER(set_h245_addr_hook, set_h245_addr); |
| 585 | RCU_INIT_POINTER(set_h225_addr_hook, set_h225_addr); |
| 586 | RCU_INIT_POINTER(set_sig_addr_hook, set_sig_addr); |
| 587 | RCU_INIT_POINTER(set_ras_addr_hook, set_ras_addr); |
| 588 | RCU_INIT_POINTER(nat_rtp_rtcp_hook, nat_rtp_rtcp); |
| 589 | RCU_INIT_POINTER(nat_t120_hook, nat_t120); |
| 590 | RCU_INIT_POINTER(nat_h245_hook, nat_h245); |
| 591 | RCU_INIT_POINTER(nat_callforwarding_hook, nat_callforwarding); |
| 592 | RCU_INIT_POINTER(nat_q931_hook, nat_q931); |
Pablo Neira Ayuso | 544d5c7 | 2012-02-05 03:44:51 +0100 | [diff] [blame] | 593 | nf_ct_helper_expectfn_register(&q931_nat); |
| 594 | nf_ct_helper_expectfn_register(&callforwarding_nat); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | /****************************************************************************/ |
| 599 | static void __exit fini(void) |
| 600 | { |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 601 | RCU_INIT_POINTER(set_h245_addr_hook, NULL); |
| 602 | RCU_INIT_POINTER(set_h225_addr_hook, NULL); |
| 603 | RCU_INIT_POINTER(set_sig_addr_hook, NULL); |
| 604 | RCU_INIT_POINTER(set_ras_addr_hook, NULL); |
| 605 | RCU_INIT_POINTER(nat_rtp_rtcp_hook, NULL); |
| 606 | RCU_INIT_POINTER(nat_t120_hook, NULL); |
| 607 | RCU_INIT_POINTER(nat_h245_hook, NULL); |
| 608 | RCU_INIT_POINTER(nat_callforwarding_hook, NULL); |
| 609 | RCU_INIT_POINTER(nat_q931_hook, NULL); |
Pablo Neira Ayuso | 544d5c7 | 2012-02-05 03:44:51 +0100 | [diff] [blame] | 610 | nf_ct_helper_expectfn_unregister(&q931_nat); |
| 611 | nf_ct_helper_expectfn_unregister(&callforwarding_nat); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 612 | synchronize_rcu(); |
| 613 | } |
| 614 | |
| 615 | /****************************************************************************/ |
| 616 | module_init(init); |
| 617 | module_exit(fini); |
| 618 | |
| 619 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); |
| 620 | MODULE_DESCRIPTION("H.323 NAT helper"); |
| 621 | MODULE_LICENSE("GPL"); |
| 622 | MODULE_ALIAS("ip_nat_h323"); |