Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * H.323 connection tracking helper |
| 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 connection tracking module by |
| 9 | * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| 10 | * |
| 11 | * For more information, please see http://nath323.sourceforge.net/ |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/moduleparam.h> |
| 16 | #include <linux/ctype.h> |
| 17 | #include <linux/inet.h> |
| 18 | #include <linux/in.h> |
| 19 | #include <linux/ip.h> |
| 20 | #include <linux/udp.h> |
| 21 | #include <linux/tcp.h> |
| 22 | #include <linux/skbuff.h> |
| 23 | #include <net/route.h> |
| 24 | #include <net/ip6_route.h> |
| 25 | |
| 26 | #include <net/netfilter/nf_conntrack.h> |
| 27 | #include <net/netfilter/nf_conntrack_core.h> |
| 28 | #include <net/netfilter/nf_conntrack_tuple.h> |
| 29 | #include <net/netfilter/nf_conntrack_expect.h> |
| 30 | #include <net/netfilter/nf_conntrack_ecache.h> |
| 31 | #include <net/netfilter/nf_conntrack_helper.h> |
| 32 | #include <linux/netfilter/nf_conntrack_h323.h> |
| 33 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 34 | /* Parameters */ |
| 35 | static unsigned int default_rrq_ttl __read_mostly = 300; |
| 36 | module_param(default_rrq_ttl, uint, 0600); |
| 37 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); |
| 38 | |
| 39 | static int gkrouted_only __read_mostly = 1; |
| 40 | module_param(gkrouted_only, int, 0600); |
| 41 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); |
| 42 | |
| 43 | static int callforward_filter __read_mostly = 1; |
| 44 | module_param(callforward_filter, bool, 0600); |
| 45 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 46 | "if both endpoints are on different sides " |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 47 | "(determined by routing information)"); |
| 48 | |
| 49 | /* Hooks for NAT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 50 | int (*set_h245_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 51 | unsigned char **data, int dataoff, |
| 52 | H245_TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 53 | union nf_inet_addr *addr, __be16 port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 54 | __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 55 | int (*set_h225_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 56 | unsigned char **data, int dataoff, |
| 57 | TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 58 | union nf_inet_addr *addr, __be16 port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 59 | __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 60 | int (*set_sig_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 61 | struct nf_conn *ct, |
| 62 | enum ip_conntrack_info ctinfo, |
| 63 | unsigned char **data, |
| 64 | TransportAddress *taddr, int count) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 65 | int (*set_ras_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 66 | struct nf_conn *ct, |
| 67 | enum ip_conntrack_info ctinfo, |
| 68 | unsigned char **data, |
| 69 | TransportAddress *taddr, int count) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 70 | int (*nat_rtp_rtcp_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 71 | struct nf_conn *ct, |
| 72 | enum ip_conntrack_info ctinfo, |
| 73 | unsigned char **data, int dataoff, |
| 74 | H245_TransportAddress *taddr, |
| 75 | __be16 port, __be16 rtp_port, |
| 76 | struct nf_conntrack_expect *rtp_exp, |
| 77 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 78 | int (*nat_t120_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 79 | struct nf_conn *ct, |
| 80 | enum ip_conntrack_info ctinfo, |
| 81 | unsigned char **data, int dataoff, |
| 82 | H245_TransportAddress *taddr, __be16 port, |
| 83 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 84 | int (*nat_h245_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 85 | struct nf_conn *ct, |
| 86 | enum ip_conntrack_info ctinfo, |
| 87 | unsigned char **data, int dataoff, |
| 88 | TransportAddress *taddr, __be16 port, |
| 89 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 90 | int (*nat_callforwarding_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 91 | struct nf_conn *ct, |
| 92 | enum ip_conntrack_info ctinfo, |
| 93 | unsigned char **data, int dataoff, |
| 94 | TransportAddress *taddr, __be16 port, |
| 95 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 96 | int (*nat_q931_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 97 | struct nf_conn *ct, |
| 98 | enum ip_conntrack_info ctinfo, |
| 99 | unsigned char **data, TransportAddress *taddr, int idx, |
| 100 | __be16 port, struct nf_conntrack_expect *exp) |
| 101 | __read_mostly; |
| 102 | |
| 103 | static DEFINE_SPINLOCK(nf_h323_lock); |
| 104 | static char *h323_buffer; |
| 105 | |
| 106 | static struct nf_conntrack_helper nf_conntrack_helper_h245; |
| 107 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; |
| 108 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; |
| 109 | |
| 110 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 111 | static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 112 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
| 113 | unsigned char **data, int *datalen, int *dataoff) |
| 114 | { |
| 115 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 116 | int dir = CTINFO2DIR(ctinfo); |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 117 | const struct tcphdr *th; |
| 118 | struct tcphdr _tcph; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 119 | int tcpdatalen; |
| 120 | int tcpdataoff; |
| 121 | unsigned char *tpkt; |
| 122 | int tpktlen; |
| 123 | int tpktoff; |
| 124 | |
| 125 | /* Get TCP header */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 126 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 127 | if (th == NULL) |
| 128 | return 0; |
| 129 | |
| 130 | /* Get TCP data offset */ |
| 131 | tcpdataoff = protoff + th->doff * 4; |
| 132 | |
| 133 | /* Get TCP data length */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 134 | tcpdatalen = skb->len - tcpdataoff; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 135 | if (tcpdatalen <= 0) /* No TCP data */ |
| 136 | goto clear_out; |
| 137 | |
| 138 | if (*data == NULL) { /* first TPKT */ |
| 139 | /* Get first TPKT pointer */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 140 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 141 | h323_buffer); |
| 142 | BUG_ON(tpkt == NULL); |
| 143 | |
| 144 | /* Validate TPKT identifier */ |
| 145 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { |
| 146 | /* Netmeeting sends TPKT header and data separately */ |
| 147 | if (info->tpkt_len[dir] > 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 148 | pr_debug("nf_ct_h323: previous packet " |
| 149 | "indicated separate TPKT data of %hu " |
| 150 | "bytes\n", info->tpkt_len[dir]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 151 | if (info->tpkt_len[dir] <= tcpdatalen) { |
| 152 | /* Yes, there was a TPKT header |
| 153 | * received */ |
| 154 | *data = tpkt; |
| 155 | *datalen = info->tpkt_len[dir]; |
| 156 | *dataoff = 0; |
| 157 | goto out; |
| 158 | } |
| 159 | |
| 160 | /* Fragmented TPKT */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 161 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 162 | goto clear_out; |
| 163 | } |
| 164 | |
| 165 | /* It is not even a TPKT */ |
| 166 | return 0; |
| 167 | } |
| 168 | tpktoff = 0; |
| 169 | } else { /* Next TPKT */ |
| 170 | tpktoff = *dataoff + *datalen; |
| 171 | tcpdatalen -= tpktoff; |
| 172 | if (tcpdatalen <= 4) /* No more TPKT */ |
| 173 | goto clear_out; |
| 174 | tpkt = *data + *datalen; |
| 175 | |
| 176 | /* Validate TPKT identifier */ |
| 177 | if (tpkt[0] != 0x03 || tpkt[1] != 0) |
| 178 | goto clear_out; |
| 179 | } |
| 180 | |
| 181 | /* Validate TPKT length */ |
| 182 | tpktlen = tpkt[2] * 256 + tpkt[3]; |
| 183 | if (tpktlen < 4) |
| 184 | goto clear_out; |
| 185 | if (tpktlen > tcpdatalen) { |
| 186 | if (tcpdatalen == 4) { /* Separate TPKT header */ |
| 187 | /* Netmeeting sends TPKT header and data separately */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 188 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
| 189 | "there will be TPKT data of %hu bytes\n", |
| 190 | tpktlen - 4); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 191 | info->tpkt_len[dir] = tpktlen - 4; |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | if (net_ratelimit()) |
| 196 | printk("nf_ct_h323: incomplete TPKT (fragmented?)\n"); |
| 197 | goto clear_out; |
| 198 | } |
| 199 | |
| 200 | /* This is the encapsulated data */ |
| 201 | *data = tpkt + 4; |
| 202 | *datalen = tpktlen - 4; |
| 203 | *dataoff = tpktoff + 4; |
| 204 | |
| 205 | out: |
| 206 | /* Clear TPKT length */ |
| 207 | info->tpkt_len[dir] = 0; |
| 208 | return 1; |
| 209 | |
| 210 | clear_out: |
| 211 | info->tpkt_len[dir] = 0; |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /****************************************************************************/ |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 216 | static int get_h245_addr(struct nf_conn *ct, const unsigned char *data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 217 | H245_TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 218 | union nf_inet_addr *addr, __be16 *port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 219 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 220 | const unsigned char *p; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 221 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 222 | int len; |
| 223 | |
| 224 | if (taddr->choice != eH245_TransportAddress_unicastAddress) |
| 225 | return 0; |
| 226 | |
| 227 | switch (taddr->unicastAddress.choice) { |
| 228 | case eUnicastAddress_iPAddress: |
| 229 | if (family != AF_INET) |
| 230 | return 0; |
| 231 | p = data + taddr->unicastAddress.iPAddress.network; |
| 232 | len = 4; |
| 233 | break; |
| 234 | case eUnicastAddress_iP6Address: |
| 235 | if (family != AF_INET6) |
| 236 | return 0; |
| 237 | p = data + taddr->unicastAddress.iP6Address.network; |
| 238 | len = 16; |
| 239 | break; |
| 240 | default: |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | memcpy(addr, p, len); |
| 245 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 246 | memcpy(port, p + len, sizeof(__be16)); |
| 247 | |
| 248 | return 1; |
| 249 | } |
| 250 | |
| 251 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 252 | static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 253 | enum ip_conntrack_info ctinfo, |
| 254 | unsigned char **data, int dataoff, |
| 255 | H245_TransportAddress *taddr) |
| 256 | { |
| 257 | int dir = CTINFO2DIR(ctinfo); |
| 258 | int ret = 0; |
| 259 | __be16 port; |
| 260 | __be16 rtp_port, rtcp_port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 261 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 262 | struct nf_conntrack_expect *rtp_exp; |
| 263 | struct nf_conntrack_expect *rtcp_exp; |
| 264 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; |
| 265 | |
| 266 | /* Read RTP or RTCP address */ |
| 267 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 268 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 269 | port == 0) |
| 270 | return 0; |
| 271 | |
| 272 | /* RTP port is even */ |
| 273 | port &= htons(~1); |
| 274 | rtp_port = port; |
| 275 | rtcp_port = htons(ntohs(port) + 1); |
| 276 | |
| 277 | /* Create expect for RTP */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 278 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 279 | return -1; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 280 | nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, |
| 281 | ct->tuplehash[!dir].tuple.src.l3num, |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 282 | &ct->tuplehash[!dir].tuple.src.u3, |
| 283 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 284 | IPPROTO_UDP, NULL, &rtp_port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 285 | |
| 286 | /* Create expect for RTCP */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 287 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
| 288 | nf_ct_expect_put(rtp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 289 | return -1; |
| 290 | } |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 291 | nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, |
| 292 | ct->tuplehash[!dir].tuple.src.l3num, |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 293 | &ct->tuplehash[!dir].tuple.src.u3, |
| 294 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 295 | IPPROTO_UDP, NULL, &rtcp_port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 296 | |
| 297 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 298 | &ct->tuplehash[!dir].tuple.dst.u3, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 299 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 300 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && |
| 301 | ct->status & IPS_NAT_MASK) { |
| 302 | /* NAT needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 303 | ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 304 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
| 305 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 306 | if (nf_ct_expect_related(rtp_exp) == 0) { |
| 307 | if (nf_ct_expect_related(rtcp_exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 308 | pr_debug("nf_ct_h323: expect RTP "); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 309 | NF_CT_DUMP_TUPLE(&rtp_exp->tuple); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 310 | pr_debug("nf_ct_h323: expect RTCP "); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 311 | NF_CT_DUMP_TUPLE(&rtcp_exp->tuple); |
| 312 | } else { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 313 | nf_ct_unexpect_related(rtp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 314 | ret = -1; |
| 315 | } |
| 316 | } else |
| 317 | ret = -1; |
| 318 | } |
| 319 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 320 | nf_ct_expect_put(rtp_exp); |
| 321 | nf_ct_expect_put(rtcp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 322 | |
| 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 327 | static int expect_t120(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 328 | struct nf_conn *ct, |
| 329 | enum ip_conntrack_info ctinfo, |
| 330 | unsigned char **data, int dataoff, |
| 331 | H245_TransportAddress *taddr) |
| 332 | { |
| 333 | int dir = CTINFO2DIR(ctinfo); |
| 334 | int ret = 0; |
| 335 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 336 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 337 | struct nf_conntrack_expect *exp; |
| 338 | typeof(nat_t120_hook) nat_t120; |
| 339 | |
| 340 | /* Read T.120 address */ |
| 341 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 342 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 343 | port == 0) |
| 344 | return 0; |
| 345 | |
| 346 | /* Create expect for T.120 connections */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 347 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 348 | return -1; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 349 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
| 350 | ct->tuplehash[!dir].tuple.src.l3num, |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 351 | &ct->tuplehash[!dir].tuple.src.u3, |
| 352 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 353 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 354 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
| 355 | |
| 356 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 357 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 358 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 359 | (nat_t120 = rcu_dereference(nat_t120_hook)) && |
| 360 | ct->status & IPS_NAT_MASK) { |
| 361 | /* NAT needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 362 | ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 363 | port, exp); |
| 364 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 365 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 366 | pr_debug("nf_ct_h323: expect T.120 "); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 367 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 368 | } else |
| 369 | ret = -1; |
| 370 | } |
| 371 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 372 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 373 | |
| 374 | return ret; |
| 375 | } |
| 376 | |
| 377 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 378 | static int process_h245_channel(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 379 | struct nf_conn *ct, |
| 380 | enum ip_conntrack_info ctinfo, |
| 381 | unsigned char **data, int dataoff, |
| 382 | H2250LogicalChannelParameters *channel) |
| 383 | { |
| 384 | int ret; |
| 385 | |
| 386 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { |
| 387 | /* RTP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 388 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 389 | &channel->mediaChannel); |
| 390 | if (ret < 0) |
| 391 | return -1; |
| 392 | } |
| 393 | |
| 394 | if (channel-> |
| 395 | options & eH2250LogicalChannelParameters_mediaControlChannel) { |
| 396 | /* RTCP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 397 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 398 | &channel->mediaControlChannel); |
| 399 | if (ret < 0) |
| 400 | return -1; |
| 401 | } |
| 402 | |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 407 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 408 | enum ip_conntrack_info ctinfo, |
| 409 | unsigned char **data, int dataoff, |
| 410 | OpenLogicalChannel *olc) |
| 411 | { |
| 412 | int ret; |
| 413 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 414 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 415 | |
| 416 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == |
| 417 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) |
| 418 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 419 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 420 | &olc-> |
| 421 | forwardLogicalChannelParameters. |
| 422 | multiplexParameters. |
| 423 | h2250LogicalChannelParameters); |
| 424 | if (ret < 0) |
| 425 | return -1; |
| 426 | } |
| 427 | |
| 428 | if ((olc->options & |
| 429 | eOpenLogicalChannel_reverseLogicalChannelParameters) && |
| 430 | (olc->reverseLogicalChannelParameters.options & |
| 431 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) |
| 432 | && (olc->reverseLogicalChannelParameters.multiplexParameters. |
| 433 | choice == |
| 434 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 435 | { |
| 436 | ret = |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 437 | process_h245_channel(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 438 | &olc-> |
| 439 | reverseLogicalChannelParameters. |
| 440 | multiplexParameters. |
| 441 | h2250LogicalChannelParameters); |
| 442 | if (ret < 0) |
| 443 | return -1; |
| 444 | } |
| 445 | |
| 446 | if ((olc->options & eOpenLogicalChannel_separateStack) && |
| 447 | olc->forwardLogicalChannelParameters.dataType.choice == |
| 448 | eDataType_data && |
| 449 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 450 | choice == eDataApplicationCapability_application_t120 && |
| 451 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 452 | t120.choice == eDataProtocolCapability_separateLANStack && |
| 453 | olc->separateStack.networkAddress.choice == |
| 454 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 455 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 456 | &olc->separateStack.networkAddress. |
| 457 | localAreaAddress); |
| 458 | if (ret < 0) |
| 459 | return -1; |
| 460 | } |
| 461 | |
| 462 | return 0; |
| 463 | } |
| 464 | |
| 465 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 466 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 467 | enum ip_conntrack_info ctinfo, |
| 468 | unsigned char **data, int dataoff, |
| 469 | OpenLogicalChannelAck *olca) |
| 470 | { |
| 471 | H2250LogicalChannelAckParameters *ack; |
| 472 | int ret; |
| 473 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 474 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 475 | |
| 476 | if ((olca->options & |
| 477 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && |
| 478 | (olca->reverseLogicalChannelParameters.options & |
| 479 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) |
| 480 | && (olca->reverseLogicalChannelParameters.multiplexParameters. |
| 481 | choice == |
| 482 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 483 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 484 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 485 | &olca-> |
| 486 | reverseLogicalChannelParameters. |
| 487 | multiplexParameters. |
| 488 | h2250LogicalChannelParameters); |
| 489 | if (ret < 0) |
| 490 | return -1; |
| 491 | } |
| 492 | |
| 493 | if ((olca->options & |
| 494 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && |
| 495 | (olca->forwardMultiplexAckParameters.choice == |
| 496 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) |
| 497 | { |
| 498 | ack = &olca->forwardMultiplexAckParameters. |
| 499 | h2250LogicalChannelAckParameters; |
| 500 | if (ack->options & |
| 501 | eH2250LogicalChannelAckParameters_mediaChannel) { |
| 502 | /* RTP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 503 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 504 | &ack->mediaChannel); |
| 505 | if (ret < 0) |
| 506 | return -1; |
| 507 | } |
| 508 | |
| 509 | if (ack->options & |
| 510 | eH2250LogicalChannelAckParameters_mediaControlChannel) { |
| 511 | /* RTCP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 512 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 513 | &ack->mediaControlChannel); |
| 514 | if (ret < 0) |
| 515 | return -1; |
| 516 | } |
| 517 | } |
| 518 | |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 519 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
| 520 | olca->separateStack.networkAddress.choice == |
| 521 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 522 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 523 | &olca->separateStack.networkAddress. |
| 524 | localAreaAddress); |
| 525 | if (ret < 0) |
| 526 | return -1; |
| 527 | } |
| 528 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 533 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 534 | enum ip_conntrack_info ctinfo, |
| 535 | unsigned char **data, int dataoff, |
| 536 | MultimediaSystemControlMessage *mscm) |
| 537 | { |
| 538 | switch (mscm->choice) { |
| 539 | case eMultimediaSystemControlMessage_request: |
| 540 | if (mscm->request.choice == |
| 541 | eRequestMessage_openLogicalChannel) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 542 | return process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 543 | &mscm->request.openLogicalChannel); |
| 544 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 545 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
| 546 | mscm->request.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 547 | break; |
| 548 | case eMultimediaSystemControlMessage_response: |
| 549 | if (mscm->response.choice == |
| 550 | eResponseMessage_openLogicalChannelAck) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 551 | return process_olca(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 552 | &mscm->response. |
| 553 | openLogicalChannelAck); |
| 554 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 555 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
| 556 | mscm->response.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 557 | break; |
| 558 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 559 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 560 | break; |
| 561 | } |
| 562 | |
| 563 | return 0; |
| 564 | } |
| 565 | |
| 566 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 567 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 568 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 569 | { |
| 570 | static MultimediaSystemControlMessage mscm; |
| 571 | unsigned char *data = NULL; |
| 572 | int datalen; |
| 573 | int dataoff; |
| 574 | int ret; |
| 575 | |
| 576 | /* Until there's been traffic both ways, don't look in packets. */ |
| 577 | if (ctinfo != IP_CT_ESTABLISHED && |
| 578 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { |
| 579 | return NF_ACCEPT; |
| 580 | } |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 581 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 582 | |
| 583 | spin_lock_bh(&nf_h323_lock); |
| 584 | |
| 585 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 586 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 587 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 588 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 589 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
| 590 | |
| 591 | /* Decode H.245 signal */ |
| 592 | ret = DecodeMultimediaSystemControlMessage(data, datalen, |
| 593 | &mscm); |
| 594 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 595 | pr_debug("nf_ct_h245: decoding error: %s\n", |
| 596 | ret == H323_ERROR_BOUND ? |
| 597 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 598 | /* We don't drop when decoding error */ |
| 599 | break; |
| 600 | } |
| 601 | |
| 602 | /* Process H.245 signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 603 | if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 604 | goto drop; |
| 605 | } |
| 606 | |
| 607 | spin_unlock_bh(&nf_h323_lock); |
| 608 | return NF_ACCEPT; |
| 609 | |
| 610 | drop: |
| 611 | spin_unlock_bh(&nf_h323_lock); |
| 612 | if (net_ratelimit()) |
| 613 | printk("nf_ct_h245: packet dropped\n"); |
| 614 | return NF_DROP; |
| 615 | } |
| 616 | |
| 617 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 618 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
| 619 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, |
| 620 | .timeout = 240, |
| 621 | }; |
| 622 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 623 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
| 624 | .name = "H.245", |
| 625 | .me = THIS_MODULE, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 626 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 627 | .help = h245_help, |
| 628 | .expect_policy = &h245_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 629 | }; |
| 630 | |
| 631 | /****************************************************************************/ |
| 632 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, |
| 633 | TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 634 | union nf_inet_addr *addr, __be16 *port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 635 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 636 | const unsigned char *p; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 637 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 638 | int len; |
| 639 | |
| 640 | switch (taddr->choice) { |
| 641 | case eTransportAddress_ipAddress: |
| 642 | if (family != AF_INET) |
| 643 | return 0; |
| 644 | p = data + taddr->ipAddress.ip; |
| 645 | len = 4; |
| 646 | break; |
| 647 | case eTransportAddress_ip6Address: |
| 648 | if (family != AF_INET6) |
| 649 | return 0; |
Jing Min Zhao | bb80724 | 2007-05-24 16:43:07 -0700 | [diff] [blame] | 650 | p = data + taddr->ip6Address.ip; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 651 | len = 16; |
| 652 | break; |
| 653 | default: |
| 654 | return 0; |
| 655 | } |
| 656 | |
| 657 | memcpy(addr, p, len); |
| 658 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 659 | memcpy(port, p + len, sizeof(__be16)); |
| 660 | |
| 661 | return 1; |
| 662 | } |
| 663 | |
| 664 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 665 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 666 | enum ip_conntrack_info ctinfo, |
| 667 | unsigned char **data, int dataoff, |
| 668 | TransportAddress *taddr) |
| 669 | { |
| 670 | int dir = CTINFO2DIR(ctinfo); |
| 671 | int ret = 0; |
| 672 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 673 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 674 | struct nf_conntrack_expect *exp; |
| 675 | typeof(nat_h245_hook) nat_h245; |
| 676 | |
| 677 | /* Read h245Address */ |
| 678 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || |
| 679 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 680 | port == 0) |
| 681 | return 0; |
| 682 | |
| 683 | /* Create expect for h245 connection */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 684 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 685 | return -1; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 686 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
| 687 | ct->tuplehash[!dir].tuple.src.l3num, |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 688 | &ct->tuplehash[!dir].tuple.src.u3, |
| 689 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 690 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 691 | exp->helper = &nf_conntrack_helper_h245; |
| 692 | |
| 693 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 694 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 695 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 696 | (nat_h245 = rcu_dereference(nat_h245_hook)) && |
| 697 | ct->status & IPS_NAT_MASK) { |
| 698 | /* NAT needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 699 | ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 700 | port, exp); |
| 701 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 702 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 703 | pr_debug("nf_ct_q931: expect H.245 "); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 704 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 705 | } else |
| 706 | ret = -1; |
| 707 | } |
| 708 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 709 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 710 | |
| 711 | return ret; |
| 712 | } |
| 713 | |
| 714 | /* If the calling party is on the same side of the forward-to party, |
| 715 | * we don't need to track the second call */ |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 716 | static int callforward_do_filter(const union nf_inet_addr *src, |
| 717 | const union nf_inet_addr *dst, int family) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 718 | { |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 719 | const struct nf_afinfo *afinfo; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 720 | struct flowi fl1, fl2; |
| 721 | int ret = 0; |
| 722 | |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 723 | /* rcu_read_lock()ed by nf_hook_slow() */ |
| 724 | afinfo = nf_get_afinfo(family); |
| 725 | if (!afinfo) |
| 726 | return 0; |
| 727 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 728 | memset(&fl1, 0, sizeof(fl1)); |
| 729 | memset(&fl2, 0, sizeof(fl2)); |
| 730 | |
| 731 | switch (family) { |
| 732 | case AF_INET: { |
| 733 | struct rtable *rt1, *rt2; |
| 734 | |
| 735 | fl1.fl4_dst = src->ip; |
| 736 | fl2.fl4_dst = dst->ip; |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 737 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
| 738 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 739 | if (rt1->rt_gateway == rt2->rt_gateway && |
| 740 | rt1->u.dst.dev == rt2->u.dst.dev) |
| 741 | ret = 1; |
| 742 | dst_release(&rt2->u.dst); |
| 743 | } |
| 744 | dst_release(&rt1->u.dst); |
| 745 | } |
| 746 | break; |
| 747 | } |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 748 | #if defined(CONFIG_NF_CONNTRACK_IPV6) || \ |
| 749 | defined(CONFIG_NF_CONNTRACK_IPV6_MODULE) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 750 | case AF_INET6: { |
| 751 | struct rt6_info *rt1, *rt2; |
| 752 | |
| 753 | memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst)); |
| 754 | memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst)); |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 755 | if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) { |
| 756 | if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 757 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 758 | sizeof(rt1->rt6i_gateway)) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 759 | rt1->u.dst.dev == rt2->u.dst.dev) |
| 760 | ret = 1; |
| 761 | dst_release(&rt2->u.dst); |
| 762 | } |
| 763 | dst_release(&rt1->u.dst); |
| 764 | } |
| 765 | break; |
| 766 | } |
| 767 | #endif |
| 768 | } |
| 769 | return ret; |
| 770 | |
| 771 | } |
| 772 | |
| 773 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 774 | static int expect_callforwarding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 775 | struct nf_conn *ct, |
| 776 | enum ip_conntrack_info ctinfo, |
| 777 | unsigned char **data, int dataoff, |
| 778 | TransportAddress *taddr) |
| 779 | { |
| 780 | int dir = CTINFO2DIR(ctinfo); |
| 781 | int ret = 0; |
| 782 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 783 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 784 | struct nf_conntrack_expect *exp; |
| 785 | typeof(nat_callforwarding_hook) nat_callforwarding; |
| 786 | |
| 787 | /* Read alternativeAddress */ |
| 788 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) |
| 789 | return 0; |
| 790 | |
| 791 | /* If the calling party is on the same side of the forward-to party, |
| 792 | * we don't need to track the second call */ |
| 793 | if (callforward_filter && |
| 794 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 795 | ct->tuplehash[!dir].tuple.src.l3num)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 796 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 797 | return 0; |
| 798 | } |
| 799 | |
| 800 | /* Create expect for the second call leg */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 801 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 802 | return -1; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 803 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
| 804 | ct->tuplehash[!dir].tuple.src.l3num, |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 805 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 806 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 807 | exp->helper = nf_conntrack_helper_q931; |
| 808 | |
| 809 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 810 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 811 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 812 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && |
| 813 | ct->status & IPS_NAT_MASK) { |
| 814 | /* Need NAT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 815 | ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 816 | taddr, port, exp); |
| 817 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 818 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 819 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 820 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 821 | } else |
| 822 | ret = -1; |
| 823 | } |
| 824 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 825 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 826 | |
| 827 | return ret; |
| 828 | } |
| 829 | |
| 830 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 831 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 832 | enum ip_conntrack_info ctinfo, |
| 833 | unsigned char **data, int dataoff, |
| 834 | Setup_UUIE *setup) |
| 835 | { |
| 836 | int dir = CTINFO2DIR(ctinfo); |
| 837 | int ret; |
| 838 | int i; |
| 839 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 840 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 841 | typeof(set_h225_addr_hook) set_h225_addr; |
| 842 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 843 | pr_debug("nf_ct_q931: Setup\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 844 | |
| 845 | if (setup->options & eSetup_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 846 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 847 | &setup->h245Address); |
| 848 | if (ret < 0) |
| 849 | return -1; |
| 850 | } |
| 851 | |
| 852 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 853 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && |
Roel Kluin | 6aebb9b | 2008-03-20 15:06:23 -0700 | [diff] [blame] | 854 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 855 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 856 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 857 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 858 | pr_debug("nf_ct_q931: set destCallSignalAddress " |
| 859 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", |
| 860 | NIP6(*(struct in6_addr *)&addr), ntohs(port), |
| 861 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3), |
| 862 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 863 | ret = set_h225_addr(skb, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 864 | &setup->destCallSignalAddress, |
| 865 | &ct->tuplehash[!dir].tuple.src.u3, |
| 866 | ct->tuplehash[!dir].tuple.src.u.tcp.port); |
| 867 | if (ret < 0) |
| 868 | return -1; |
| 869 | } |
| 870 | |
| 871 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && |
| 872 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
| 873 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 874 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 875 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 876 | pr_debug("nf_ct_q931: set sourceCallSignalAddress " |
| 877 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", |
| 878 | NIP6(*(struct in6_addr *)&addr), ntohs(port), |
| 879 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3), |
| 880 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 881 | ret = set_h225_addr(skb, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 882 | &setup->sourceCallSignalAddress, |
| 883 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 884 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); |
| 885 | if (ret < 0) |
| 886 | return -1; |
| 887 | } |
| 888 | |
| 889 | if (setup->options & eSetup_UUIE_fastStart) { |
| 890 | for (i = 0; i < setup->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 891 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 892 | &setup->fastStart.item[i]); |
| 893 | if (ret < 0) |
| 894 | return -1; |
| 895 | } |
| 896 | } |
| 897 | |
| 898 | return 0; |
| 899 | } |
| 900 | |
| 901 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 902 | static int process_callproceeding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 903 | struct nf_conn *ct, |
| 904 | enum ip_conntrack_info ctinfo, |
| 905 | unsigned char **data, int dataoff, |
| 906 | CallProceeding_UUIE *callproc) |
| 907 | { |
| 908 | int ret; |
| 909 | int i; |
| 910 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 911 | pr_debug("nf_ct_q931: CallProceeding\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 912 | |
| 913 | if (callproc->options & eCallProceeding_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 914 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 915 | &callproc->h245Address); |
| 916 | if (ret < 0) |
| 917 | return -1; |
| 918 | } |
| 919 | |
| 920 | if (callproc->options & eCallProceeding_UUIE_fastStart) { |
| 921 | for (i = 0; i < callproc->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 922 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 923 | &callproc->fastStart.item[i]); |
| 924 | if (ret < 0) |
| 925 | return -1; |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | return 0; |
| 930 | } |
| 931 | |
| 932 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 933 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 934 | enum ip_conntrack_info ctinfo, |
| 935 | unsigned char **data, int dataoff, |
| 936 | Connect_UUIE *connect) |
| 937 | { |
| 938 | int ret; |
| 939 | int i; |
| 940 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 941 | pr_debug("nf_ct_q931: Connect\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 942 | |
| 943 | if (connect->options & eConnect_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 944 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 945 | &connect->h245Address); |
| 946 | if (ret < 0) |
| 947 | return -1; |
| 948 | } |
| 949 | |
| 950 | if (connect->options & eConnect_UUIE_fastStart) { |
| 951 | for (i = 0; i < connect->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 952 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 953 | &connect->fastStart.item[i]); |
| 954 | if (ret < 0) |
| 955 | return -1; |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | return 0; |
| 960 | } |
| 961 | |
| 962 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 963 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 964 | enum ip_conntrack_info ctinfo, |
| 965 | unsigned char **data, int dataoff, |
| 966 | Alerting_UUIE *alert) |
| 967 | { |
| 968 | int ret; |
| 969 | int i; |
| 970 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 971 | pr_debug("nf_ct_q931: Alerting\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 972 | |
| 973 | if (alert->options & eAlerting_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 974 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 975 | &alert->h245Address); |
| 976 | if (ret < 0) |
| 977 | return -1; |
| 978 | } |
| 979 | |
| 980 | if (alert->options & eAlerting_UUIE_fastStart) { |
| 981 | for (i = 0; i < alert->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 982 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 983 | &alert->fastStart.item[i]); |
| 984 | if (ret < 0) |
| 985 | return -1; |
| 986 | } |
| 987 | } |
| 988 | |
| 989 | return 0; |
| 990 | } |
| 991 | |
| 992 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 993 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 994 | enum ip_conntrack_info ctinfo, |
| 995 | unsigned char **data, int dataoff, |
| 996 | Facility_UUIE *facility) |
| 997 | { |
| 998 | int ret; |
| 999 | int i; |
| 1000 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1001 | pr_debug("nf_ct_q931: Facility\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1002 | |
| 1003 | if (facility->reason.choice == eFacilityReason_callForwarded) { |
| 1004 | if (facility->options & eFacility_UUIE_alternativeAddress) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1005 | return expect_callforwarding(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1006 | dataoff, |
| 1007 | &facility-> |
| 1008 | alternativeAddress); |
| 1009 | return 0; |
| 1010 | } |
| 1011 | |
| 1012 | if (facility->options & eFacility_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1013 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1014 | &facility->h245Address); |
| 1015 | if (ret < 0) |
| 1016 | return -1; |
| 1017 | } |
| 1018 | |
| 1019 | if (facility->options & eFacility_UUIE_fastStart) { |
| 1020 | for (i = 0; i < facility->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1021 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1022 | &facility->fastStart.item[i]); |
| 1023 | if (ret < 0) |
| 1024 | return -1; |
| 1025 | } |
| 1026 | } |
| 1027 | |
| 1028 | return 0; |
| 1029 | } |
| 1030 | |
| 1031 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1032 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1033 | enum ip_conntrack_info ctinfo, |
| 1034 | unsigned char **data, int dataoff, |
| 1035 | Progress_UUIE *progress) |
| 1036 | { |
| 1037 | int ret; |
| 1038 | int i; |
| 1039 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1040 | pr_debug("nf_ct_q931: Progress\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1041 | |
| 1042 | if (progress->options & eProgress_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1043 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1044 | &progress->h245Address); |
| 1045 | if (ret < 0) |
| 1046 | return -1; |
| 1047 | } |
| 1048 | |
| 1049 | if (progress->options & eProgress_UUIE_fastStart) { |
| 1050 | for (i = 0; i < progress->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1051 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1052 | &progress->fastStart.item[i]); |
| 1053 | if (ret < 0) |
| 1054 | return -1; |
| 1055 | } |
| 1056 | } |
| 1057 | |
| 1058 | return 0; |
| 1059 | } |
| 1060 | |
| 1061 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1062 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1063 | enum ip_conntrack_info ctinfo, |
| 1064 | unsigned char **data, int dataoff, Q931 *q931) |
| 1065 | { |
| 1066 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; |
| 1067 | int i; |
| 1068 | int ret = 0; |
| 1069 | |
| 1070 | switch (pdu->h323_message_body.choice) { |
| 1071 | case eH323_UU_PDU_h323_message_body_setup: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1072 | ret = process_setup(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1073 | &pdu->h323_message_body.setup); |
| 1074 | break; |
| 1075 | case eH323_UU_PDU_h323_message_body_callProceeding: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1076 | ret = process_callproceeding(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1077 | &pdu->h323_message_body. |
| 1078 | callProceeding); |
| 1079 | break; |
| 1080 | case eH323_UU_PDU_h323_message_body_connect: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1081 | ret = process_connect(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1082 | &pdu->h323_message_body.connect); |
| 1083 | break; |
| 1084 | case eH323_UU_PDU_h323_message_body_alerting: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1085 | ret = process_alerting(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1086 | &pdu->h323_message_body.alerting); |
| 1087 | break; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1088 | case eH323_UU_PDU_h323_message_body_facility: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1089 | ret = process_facility(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1090 | &pdu->h323_message_body.facility); |
| 1091 | break; |
| 1092 | case eH323_UU_PDU_h323_message_body_progress: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1093 | ret = process_progress(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1094 | &pdu->h323_message_body.progress); |
| 1095 | break; |
| 1096 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1097 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
| 1098 | pdu->h323_message_body.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1099 | break; |
| 1100 | } |
| 1101 | |
| 1102 | if (ret < 0) |
| 1103 | return -1; |
| 1104 | |
| 1105 | if (pdu->options & eH323_UU_PDU_h245Control) { |
| 1106 | for (i = 0; i < pdu->h245Control.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1107 | ret = process_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1108 | &pdu->h245Control.item[i]); |
| 1109 | if (ret < 0) |
| 1110 | return -1; |
| 1111 | } |
| 1112 | } |
| 1113 | |
| 1114 | return 0; |
| 1115 | } |
| 1116 | |
| 1117 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1118 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1119 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1120 | { |
| 1121 | static Q931 q931; |
| 1122 | unsigned char *data = NULL; |
| 1123 | int datalen; |
| 1124 | int dataoff; |
| 1125 | int ret; |
| 1126 | |
| 1127 | /* Until there's been traffic both ways, don't look in packets. */ |
| 1128 | if (ctinfo != IP_CT_ESTABLISHED && |
| 1129 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { |
| 1130 | return NF_ACCEPT; |
| 1131 | } |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1132 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1133 | |
| 1134 | spin_lock_bh(&nf_h323_lock); |
| 1135 | |
| 1136 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1137 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1138 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1139 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1140 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
| 1141 | |
| 1142 | /* Decode Q.931 signal */ |
| 1143 | ret = DecodeQ931(data, datalen, &q931); |
| 1144 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1145 | pr_debug("nf_ct_q931: decoding error: %s\n", |
| 1146 | ret == H323_ERROR_BOUND ? |
| 1147 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1148 | /* We don't drop when decoding error */ |
| 1149 | break; |
| 1150 | } |
| 1151 | |
| 1152 | /* Process Q.931 signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1153 | if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1154 | goto drop; |
| 1155 | } |
| 1156 | |
| 1157 | spin_unlock_bh(&nf_h323_lock); |
| 1158 | return NF_ACCEPT; |
| 1159 | |
| 1160 | drop: |
| 1161 | spin_unlock_bh(&nf_h323_lock); |
| 1162 | if (net_ratelimit()) |
| 1163 | printk("nf_ct_q931: packet dropped\n"); |
| 1164 | return NF_DROP; |
| 1165 | } |
| 1166 | |
| 1167 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1168 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
| 1169 | /* T.120 and H.245 */ |
| 1170 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, |
| 1171 | .timeout = 240, |
| 1172 | }; |
| 1173 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1174 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
| 1175 | { |
| 1176 | .name = "Q.931", |
| 1177 | .me = THIS_MODULE, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1178 | .tuple.src.l3num = AF_INET, |
| 1179 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), |
| 1180 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1181 | .help = q931_help, |
| 1182 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1183 | }, |
| 1184 | { |
| 1185 | .name = "Q.931", |
| 1186 | .me = THIS_MODULE, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1187 | .tuple.src.l3num = AF_INET6, |
| 1188 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), |
| 1189 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1190 | .help = q931_help, |
| 1191 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1192 | }, |
| 1193 | }; |
| 1194 | |
| 1195 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1196 | static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1197 | int *datalen) |
| 1198 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 1199 | const struct udphdr *uh; |
| 1200 | struct udphdr _uh; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1201 | int dataoff; |
| 1202 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1203 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1204 | if (uh == NULL) |
| 1205 | return NULL; |
| 1206 | dataoff = protoff + sizeof(_uh); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1207 | if (dataoff >= skb->len) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1208 | return NULL; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1209 | *datalen = skb->len - dataoff; |
| 1210 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1211 | } |
| 1212 | |
| 1213 | /****************************************************************************/ |
| 1214 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1215 | union nf_inet_addr *addr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1216 | __be16 port) |
| 1217 | { |
| 1218 | struct nf_conntrack_expect *exp; |
| 1219 | struct nf_conntrack_tuple tuple; |
| 1220 | |
| 1221 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); |
| 1222 | tuple.src.u.tcp.port = 0; |
| 1223 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); |
| 1224 | tuple.dst.u.tcp.port = port; |
| 1225 | tuple.dst.protonum = IPPROTO_TCP; |
| 1226 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1227 | exp = __nf_ct_expect_find(&tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1228 | if (exp && exp->master == ct) |
| 1229 | return exp; |
| 1230 | return NULL; |
| 1231 | } |
| 1232 | |
| 1233 | /****************************************************************************/ |
| 1234 | static int set_expect_timeout(struct nf_conntrack_expect *exp, |
| 1235 | unsigned timeout) |
| 1236 | { |
| 1237 | if (!exp || !del_timer(&exp->timeout)) |
| 1238 | return 0; |
| 1239 | |
| 1240 | exp->timeout.expires = jiffies + timeout * HZ; |
| 1241 | add_timer(&exp->timeout); |
| 1242 | |
| 1243 | return 1; |
| 1244 | } |
| 1245 | |
| 1246 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1247 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1248 | enum ip_conntrack_info ctinfo, |
| 1249 | unsigned char **data, |
| 1250 | TransportAddress *taddr, int count) |
| 1251 | { |
| 1252 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 1253 | int dir = CTINFO2DIR(ctinfo); |
| 1254 | int ret = 0; |
| 1255 | int i; |
| 1256 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1257 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1258 | struct nf_conntrack_expect *exp; |
| 1259 | typeof(nat_q931_hook) nat_q931; |
| 1260 | |
| 1261 | /* Look for the first related address */ |
| 1262 | for (i = 0; i < count; i++) { |
| 1263 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && |
| 1264 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1265 | sizeof(addr)) == 0 && port != 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1266 | break; |
| 1267 | } |
| 1268 | |
| 1269 | if (i >= count) /* Not found */ |
| 1270 | return 0; |
| 1271 | |
| 1272 | /* Create expect for Q.931 */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1273 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1274 | return -1; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1275 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
| 1276 | ct->tuplehash[!dir].tuple.src.l3num, |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1277 | gkrouted_only ? /* only accept calls from GK? */ |
| 1278 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, |
| 1279 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1280 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1281 | exp->helper = nf_conntrack_helper_q931; |
| 1282 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ |
| 1283 | |
| 1284 | nat_q931 = rcu_dereference(nat_q931_hook); |
| 1285 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1286 | ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1287 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1288 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1289 | pr_debug("nf_ct_ras: expect Q.931 "); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1290 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1291 | |
| 1292 | /* Save port for looking up expect in processing RCF */ |
| 1293 | info->sig_port[dir] = port; |
| 1294 | } else |
| 1295 | ret = -1; |
| 1296 | } |
| 1297 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1298 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1299 | |
| 1300 | return ret; |
| 1301 | } |
| 1302 | |
| 1303 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1304 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1305 | enum ip_conntrack_info ctinfo, |
| 1306 | unsigned char **data, GatekeeperRequest *grq) |
| 1307 | { |
| 1308 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1309 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1310 | pr_debug("nf_ct_ras: GRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1311 | |
| 1312 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1313 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1314 | return set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1315 | &grq->rasAddress, 1); |
| 1316 | return 0; |
| 1317 | } |
| 1318 | |
| 1319 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1320 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1321 | enum ip_conntrack_info ctinfo, |
| 1322 | unsigned char **data, GatekeeperConfirm *gcf) |
| 1323 | { |
| 1324 | int dir = CTINFO2DIR(ctinfo); |
| 1325 | int ret = 0; |
| 1326 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1327 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1328 | struct nf_conntrack_expect *exp; |
| 1329 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1330 | pr_debug("nf_ct_ras: GCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1331 | |
| 1332 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) |
| 1333 | return 0; |
| 1334 | |
| 1335 | /* Registration port is the same as discovery port */ |
| 1336 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1337 | port == ct->tuplehash[dir].tuple.src.u.udp.port) |
| 1338 | return 0; |
| 1339 | |
| 1340 | /* Avoid RAS expectation loops. A GCF is never expected. */ |
| 1341 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
| 1342 | return 0; |
| 1343 | |
| 1344 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1345 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1346 | return -1; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1347 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
| 1348 | ct->tuplehash[!dir].tuple.src.l3num, |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1349 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1350 | IPPROTO_UDP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1351 | exp->helper = nf_conntrack_helper_ras; |
| 1352 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1353 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1354 | pr_debug("nf_ct_ras: expect RAS "); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1355 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1356 | } else |
| 1357 | ret = -1; |
| 1358 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1359 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1360 | |
| 1361 | return ret; |
| 1362 | } |
| 1363 | |
| 1364 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1365 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1366 | enum ip_conntrack_info ctinfo, |
| 1367 | unsigned char **data, RegistrationRequest *rrq) |
| 1368 | { |
| 1369 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 1370 | int ret; |
| 1371 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1372 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1373 | pr_debug("nf_ct_ras: RRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1374 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1375 | ret = expect_q931(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1376 | rrq->callSignalAddress.item, |
| 1377 | rrq->callSignalAddress.count); |
| 1378 | if (ret < 0) |
| 1379 | return -1; |
| 1380 | |
| 1381 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1382 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1383 | ret = set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1384 | rrq->rasAddress.item, |
| 1385 | rrq->rasAddress.count); |
| 1386 | if (ret < 0) |
| 1387 | return -1; |
| 1388 | } |
| 1389 | |
| 1390 | if (rrq->options & eRegistrationRequest_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1391 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1392 | info->timeout = rrq->timeToLive; |
| 1393 | } else |
| 1394 | info->timeout = default_rrq_ttl; |
| 1395 | |
| 1396 | return 0; |
| 1397 | } |
| 1398 | |
| 1399 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1400 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1401 | enum ip_conntrack_info ctinfo, |
| 1402 | unsigned char **data, RegistrationConfirm *rcf) |
| 1403 | { |
| 1404 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 1405 | int dir = CTINFO2DIR(ctinfo); |
| 1406 | int ret; |
| 1407 | struct nf_conntrack_expect *exp; |
| 1408 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1409 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1410 | pr_debug("nf_ct_ras: RCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1411 | |
| 1412 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1413 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1414 | ret = set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1415 | rcf->callSignalAddress.item, |
| 1416 | rcf->callSignalAddress.count); |
| 1417 | if (ret < 0) |
| 1418 | return -1; |
| 1419 | } |
| 1420 | |
| 1421 | if (rcf->options & eRegistrationConfirm_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1422 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1423 | info->timeout = rcf->timeToLive; |
| 1424 | } |
| 1425 | |
| 1426 | if (info->timeout > 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1427 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
| 1428 | "%u seconds\n", info->timeout); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1429 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1430 | |
| 1431 | /* Set expect timeout */ |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1432 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1433 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
| 1434 | info->sig_port[!dir]); |
| 1435 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1436 | pr_debug("nf_ct_ras: set Q.931 expect " |
| 1437 | "timeout to %u seconds for", |
| 1438 | info->timeout); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1439 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1440 | set_expect_timeout(exp, info->timeout); |
| 1441 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1442 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1443 | } |
| 1444 | |
| 1445 | return 0; |
| 1446 | } |
| 1447 | |
| 1448 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1449 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1450 | enum ip_conntrack_info ctinfo, |
| 1451 | unsigned char **data, UnregistrationRequest *urq) |
| 1452 | { |
| 1453 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 1454 | int dir = CTINFO2DIR(ctinfo); |
| 1455 | int ret; |
| 1456 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1457 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1458 | pr_debug("nf_ct_ras: URQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1459 | |
| 1460 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1461 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1462 | ret = set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1463 | urq->callSignalAddress.item, |
| 1464 | urq->callSignalAddress.count); |
| 1465 | if (ret < 0) |
| 1466 | return -1; |
| 1467 | } |
| 1468 | |
| 1469 | /* Clear old expect */ |
| 1470 | nf_ct_remove_expectations(ct); |
| 1471 | info->sig_port[dir] = 0; |
| 1472 | info->sig_port[!dir] = 0; |
| 1473 | |
| 1474 | /* Give it 30 seconds for UCF or URJ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1475 | nf_ct_refresh(ct, skb, 30 * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1476 | |
| 1477 | return 0; |
| 1478 | } |
| 1479 | |
| 1480 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1481 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1482 | enum ip_conntrack_info ctinfo, |
| 1483 | unsigned char **data, AdmissionRequest *arq) |
| 1484 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 1485 | 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] | 1486 | int dir = CTINFO2DIR(ctinfo); |
| 1487 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1488 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1489 | typeof(set_h225_addr_hook) set_h225_addr; |
| 1490 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1491 | pr_debug("nf_ct_ras: ARQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1492 | |
| 1493 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 1494 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && |
| 1495 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1496 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1497 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1498 | port == info->sig_port[dir] && |
| 1499 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
| 1500 | /* Answering ARQ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1501 | return set_h225_addr(skb, data, 0, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1502 | &arq->destCallSignalAddress, |
| 1503 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1504 | info->sig_port[!dir]); |
| 1505 | } |
| 1506 | |
| 1507 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && |
| 1508 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1509 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1510 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1511 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
| 1512 | /* Calling ARQ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1513 | return set_h225_addr(skb, data, 0, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1514 | &arq->srcCallSignalAddress, |
| 1515 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1516 | port); |
| 1517 | } |
| 1518 | |
| 1519 | return 0; |
| 1520 | } |
| 1521 | |
| 1522 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1523 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1524 | enum ip_conntrack_info ctinfo, |
| 1525 | unsigned char **data, AdmissionConfirm *acf) |
| 1526 | { |
| 1527 | int dir = CTINFO2DIR(ctinfo); |
| 1528 | int ret = 0; |
| 1529 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1530 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1531 | struct nf_conntrack_expect *exp; |
| 1532 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1533 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1534 | pr_debug("nf_ct_ras: ACF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1535 | |
| 1536 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, |
| 1537 | &addr, &port)) |
| 1538 | return 0; |
| 1539 | |
| 1540 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { |
| 1541 | /* Answering ACF */ |
| 1542 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1543 | if (set_sig_addr && ct->status & IPS_NAT_MASK) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1544 | return set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1545 | &acf->destCallSignalAddress, 1); |
| 1546 | return 0; |
| 1547 | } |
| 1548 | |
| 1549 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1550 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1551 | return -1; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1552 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
| 1553 | ct->tuplehash[!dir].tuple.src.l3num, |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1554 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1555 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1556 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1557 | exp->helper = nf_conntrack_helper_q931; |
| 1558 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1559 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1560 | pr_debug("nf_ct_ras: expect Q.931 "); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1561 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1562 | } else |
| 1563 | ret = -1; |
| 1564 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1565 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1566 | |
| 1567 | return ret; |
| 1568 | } |
| 1569 | |
| 1570 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1571 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1572 | enum ip_conntrack_info ctinfo, |
| 1573 | unsigned char **data, LocationRequest *lrq) |
| 1574 | { |
| 1575 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1576 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1577 | pr_debug("nf_ct_ras: LRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1578 | |
| 1579 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1580 | if (set_ras_addr && ct->status & IPS_NAT_MASK) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1581 | return set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1582 | &lrq->replyAddress, 1); |
| 1583 | return 0; |
| 1584 | } |
| 1585 | |
| 1586 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1587 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1588 | enum ip_conntrack_info ctinfo, |
| 1589 | unsigned char **data, LocationConfirm *lcf) |
| 1590 | { |
| 1591 | int dir = CTINFO2DIR(ctinfo); |
| 1592 | int ret = 0; |
| 1593 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1594 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1595 | struct nf_conntrack_expect *exp; |
| 1596 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1597 | pr_debug("nf_ct_ras: LCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1598 | |
| 1599 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, |
| 1600 | &addr, &port)) |
| 1601 | return 0; |
| 1602 | |
| 1603 | /* Need new expect for call signal */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1604 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1605 | return -1; |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1606 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, |
| 1607 | ct->tuplehash[!dir].tuple.src.l3num, |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1608 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1609 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1610 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1611 | exp->helper = nf_conntrack_helper_q931; |
| 1612 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1613 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1614 | pr_debug("nf_ct_ras: expect Q.931 "); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1615 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1616 | } else |
| 1617 | ret = -1; |
| 1618 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1619 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1620 | |
| 1621 | /* Ignore rasAddress */ |
| 1622 | |
| 1623 | return ret; |
| 1624 | } |
| 1625 | |
| 1626 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1627 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1628 | enum ip_conntrack_info ctinfo, |
| 1629 | unsigned char **data, InfoRequestResponse *irr) |
| 1630 | { |
| 1631 | int ret; |
| 1632 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1633 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1634 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1635 | pr_debug("nf_ct_ras: IRR\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1636 | |
| 1637 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1638 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1639 | ret = set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1640 | &irr->rasAddress, 1); |
| 1641 | if (ret < 0) |
| 1642 | return -1; |
| 1643 | } |
| 1644 | |
| 1645 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1646 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1647 | ret = set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1648 | irr->callSignalAddress.item, |
| 1649 | irr->callSignalAddress.count); |
| 1650 | if (ret < 0) |
| 1651 | return -1; |
| 1652 | } |
| 1653 | |
| 1654 | return 0; |
| 1655 | } |
| 1656 | |
| 1657 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1658 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1659 | enum ip_conntrack_info ctinfo, |
| 1660 | unsigned char **data, RasMessage *ras) |
| 1661 | { |
| 1662 | switch (ras->choice) { |
| 1663 | case eRasMessage_gatekeeperRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1664 | return process_grq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1665 | &ras->gatekeeperRequest); |
| 1666 | case eRasMessage_gatekeeperConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1667 | return process_gcf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1668 | &ras->gatekeeperConfirm); |
| 1669 | case eRasMessage_registrationRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1670 | return process_rrq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1671 | &ras->registrationRequest); |
| 1672 | case eRasMessage_registrationConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1673 | return process_rcf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1674 | &ras->registrationConfirm); |
| 1675 | case eRasMessage_unregistrationRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1676 | return process_urq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1677 | &ras->unregistrationRequest); |
| 1678 | case eRasMessage_admissionRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1679 | return process_arq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1680 | &ras->admissionRequest); |
| 1681 | case eRasMessage_admissionConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1682 | return process_acf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1683 | &ras->admissionConfirm); |
| 1684 | case eRasMessage_locationRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1685 | return process_lrq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1686 | &ras->locationRequest); |
| 1687 | case eRasMessage_locationConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1688 | return process_lcf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1689 | &ras->locationConfirm); |
| 1690 | case eRasMessage_infoRequestResponse: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1691 | return process_irr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1692 | &ras->infoRequestResponse); |
| 1693 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1694 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1695 | break; |
| 1696 | } |
| 1697 | |
| 1698 | return 0; |
| 1699 | } |
| 1700 | |
| 1701 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1702 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1703 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1704 | { |
| 1705 | static RasMessage ras; |
| 1706 | unsigned char *data; |
| 1707 | int datalen = 0; |
| 1708 | int ret; |
| 1709 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1710 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1711 | |
| 1712 | spin_lock_bh(&nf_h323_lock); |
| 1713 | |
| 1714 | /* Get UDP data */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1715 | data = get_udp_data(skb, protoff, &datalen); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1716 | if (data == NULL) |
| 1717 | goto accept; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1718 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1719 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
| 1720 | |
| 1721 | /* Decode RAS message */ |
| 1722 | ret = DecodeRasMessage(data, datalen, &ras); |
| 1723 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1724 | pr_debug("nf_ct_ras: decoding error: %s\n", |
| 1725 | ret == H323_ERROR_BOUND ? |
| 1726 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1727 | goto accept; |
| 1728 | } |
| 1729 | |
| 1730 | /* Process RAS message */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1731 | if (process_ras(skb, ct, ctinfo, &data, &ras) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1732 | goto drop; |
| 1733 | |
| 1734 | accept: |
| 1735 | spin_unlock_bh(&nf_h323_lock); |
| 1736 | return NF_ACCEPT; |
| 1737 | |
| 1738 | drop: |
| 1739 | spin_unlock_bh(&nf_h323_lock); |
| 1740 | if (net_ratelimit()) |
| 1741 | printk("nf_ct_ras: packet dropped\n"); |
| 1742 | return NF_DROP; |
| 1743 | } |
| 1744 | |
| 1745 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1746 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
| 1747 | .max_expected = 32, |
| 1748 | .timeout = 240, |
| 1749 | }; |
| 1750 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1751 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
| 1752 | { |
| 1753 | .name = "RAS", |
| 1754 | .me = THIS_MODULE, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1755 | .tuple.src.l3num = AF_INET, |
| 1756 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), |
| 1757 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1758 | .help = ras_help, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1759 | .expect_policy = &ras_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1760 | }, |
| 1761 | { |
| 1762 | .name = "RAS", |
| 1763 | .me = THIS_MODULE, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1764 | .tuple.src.l3num = AF_INET6, |
| 1765 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), |
| 1766 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1767 | .help = ras_help, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 1768 | .expect_policy = &ras_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1769 | }, |
| 1770 | }; |
| 1771 | |
| 1772 | /****************************************************************************/ |
| 1773 | static void __exit nf_conntrack_h323_fini(void) |
| 1774 | { |
| 1775 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); |
| 1776 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
| 1777 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
| 1778 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
| 1779 | kfree(h323_buffer); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1780 | pr_debug("nf_ct_h323: fini\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1781 | } |
| 1782 | |
| 1783 | /****************************************************************************/ |
| 1784 | static int __init nf_conntrack_h323_init(void) |
| 1785 | { |
| 1786 | int ret; |
| 1787 | |
| 1788 | h323_buffer = kmalloc(65536, GFP_KERNEL); |
| 1789 | if (!h323_buffer) |
| 1790 | return -ENOMEM; |
| 1791 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); |
| 1792 | if (ret < 0) |
| 1793 | goto err1; |
| 1794 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); |
| 1795 | if (ret < 0) |
| 1796 | goto err2; |
| 1797 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); |
| 1798 | if (ret < 0) |
| 1799 | goto err3; |
| 1800 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); |
| 1801 | if (ret < 0) |
| 1802 | goto err4; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1803 | pr_debug("nf_ct_h323: init success\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1804 | return 0; |
| 1805 | |
| 1806 | err4: |
| 1807 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
| 1808 | err3: |
| 1809 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
| 1810 | err2: |
| 1811 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
| 1812 | err1: |
| 1813 | return ret; |
| 1814 | } |
| 1815 | |
| 1816 | /****************************************************************************/ |
| 1817 | module_init(nf_conntrack_h323_init); |
| 1818 | module_exit(nf_conntrack_h323_fini); |
| 1819 | |
| 1820 | EXPORT_SYMBOL_GPL(get_h225_addr); |
| 1821 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); |
| 1822 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); |
| 1823 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); |
| 1824 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); |
| 1825 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); |
| 1826 | EXPORT_SYMBOL_GPL(nat_t120_hook); |
| 1827 | EXPORT_SYMBOL_GPL(nat_h245_hook); |
| 1828 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); |
| 1829 | EXPORT_SYMBOL_GPL(nat_q931_hook); |
| 1830 | |
| 1831 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); |
| 1832 | MODULE_DESCRIPTION("H.323 connection tracking helper"); |
| 1833 | MODULE_LICENSE("GPL"); |
| 1834 | MODULE_ALIAS("ip_conntrack_h323"); |