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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 21 | #include <linux/udp.h> |
| 22 | #include <linux/tcp.h> |
| 23 | #include <linux/skbuff.h> |
| 24 | #include <net/route.h> |
| 25 | #include <net/ip6_route.h> |
| 26 | |
| 27 | #include <net/netfilter/nf_conntrack.h> |
| 28 | #include <net/netfilter/nf_conntrack_core.h> |
| 29 | #include <net/netfilter/nf_conntrack_tuple.h> |
| 30 | #include <net/netfilter/nf_conntrack_expect.h> |
| 31 | #include <net/netfilter/nf_conntrack_ecache.h> |
| 32 | #include <net/netfilter/nf_conntrack_helper.h> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 33 | #include <net/netfilter/nf_conntrack_zones.h> |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 34 | #include <linux/netfilter/nf_conntrack_h323.h> |
| 35 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 36 | /* Parameters */ |
| 37 | static unsigned int default_rrq_ttl __read_mostly = 300; |
| 38 | module_param(default_rrq_ttl, uint, 0600); |
| 39 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); |
| 40 | |
| 41 | static int gkrouted_only __read_mostly = 1; |
| 42 | module_param(gkrouted_only, int, 0600); |
| 43 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); |
| 44 | |
Rusty Russell | eb93992 | 2011-12-19 14:08:01 +0000 | [diff] [blame] | 45 | static bool callforward_filter __read_mostly = true; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 46 | module_param(callforward_filter, bool, 0600); |
| 47 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 48 | "if both endpoints are on different sides " |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 49 | "(determined by routing information)"); |
| 50 | |
| 51 | /* Hooks for NAT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 52 | int (*set_h245_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 53 | unsigned char **data, int dataoff, |
| 54 | H245_TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 55 | union nf_inet_addr *addr, __be16 port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 56 | __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 57 | int (*set_h225_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 58 | unsigned char **data, int dataoff, |
| 59 | TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 60 | union nf_inet_addr *addr, __be16 port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 61 | __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 62 | int (*set_sig_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 63 | struct nf_conn *ct, |
| 64 | enum ip_conntrack_info ctinfo, |
| 65 | unsigned char **data, |
| 66 | TransportAddress *taddr, int count) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 67 | int (*set_ras_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 68 | struct nf_conn *ct, |
| 69 | enum ip_conntrack_info ctinfo, |
| 70 | unsigned char **data, |
| 71 | TransportAddress *taddr, int count) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 72 | int (*nat_rtp_rtcp_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 73 | struct nf_conn *ct, |
| 74 | enum ip_conntrack_info ctinfo, |
| 75 | unsigned char **data, int dataoff, |
| 76 | H245_TransportAddress *taddr, |
| 77 | __be16 port, __be16 rtp_port, |
| 78 | struct nf_conntrack_expect *rtp_exp, |
| 79 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 80 | int (*nat_t120_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 81 | struct nf_conn *ct, |
| 82 | enum ip_conntrack_info ctinfo, |
| 83 | unsigned char **data, int dataoff, |
| 84 | H245_TransportAddress *taddr, __be16 port, |
| 85 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 86 | int (*nat_h245_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 87 | struct nf_conn *ct, |
| 88 | enum ip_conntrack_info ctinfo, |
| 89 | unsigned char **data, int dataoff, |
| 90 | TransportAddress *taddr, __be16 port, |
| 91 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 92 | int (*nat_callforwarding_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 93 | struct nf_conn *ct, |
| 94 | enum ip_conntrack_info ctinfo, |
| 95 | unsigned char **data, int dataoff, |
| 96 | TransportAddress *taddr, __be16 port, |
| 97 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 98 | int (*nat_q931_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 99 | struct nf_conn *ct, |
| 100 | enum ip_conntrack_info ctinfo, |
| 101 | unsigned char **data, TransportAddress *taddr, int idx, |
| 102 | __be16 port, struct nf_conntrack_expect *exp) |
| 103 | __read_mostly; |
| 104 | |
| 105 | static DEFINE_SPINLOCK(nf_h323_lock); |
| 106 | static char *h323_buffer; |
| 107 | |
| 108 | static struct nf_conntrack_helper nf_conntrack_helper_h245; |
| 109 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; |
| 110 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; |
| 111 | |
| 112 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 113 | static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 114 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
| 115 | unsigned char **data, int *datalen, int *dataoff) |
| 116 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 117 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 118 | int dir = CTINFO2DIR(ctinfo); |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 119 | const struct tcphdr *th; |
| 120 | struct tcphdr _tcph; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 121 | int tcpdatalen; |
| 122 | int tcpdataoff; |
| 123 | unsigned char *tpkt; |
| 124 | int tpktlen; |
| 125 | int tpktoff; |
| 126 | |
| 127 | /* Get TCP header */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 128 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 129 | if (th == NULL) |
| 130 | return 0; |
| 131 | |
| 132 | /* Get TCP data offset */ |
| 133 | tcpdataoff = protoff + th->doff * 4; |
| 134 | |
| 135 | /* Get TCP data length */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 136 | tcpdatalen = skb->len - tcpdataoff; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 137 | if (tcpdatalen <= 0) /* No TCP data */ |
| 138 | goto clear_out; |
| 139 | |
| 140 | if (*data == NULL) { /* first TPKT */ |
| 141 | /* Get first TPKT pointer */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 142 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 143 | h323_buffer); |
| 144 | BUG_ON(tpkt == NULL); |
| 145 | |
| 146 | /* Validate TPKT identifier */ |
| 147 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { |
| 148 | /* Netmeeting sends TPKT header and data separately */ |
| 149 | if (info->tpkt_len[dir] > 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 150 | pr_debug("nf_ct_h323: previous packet " |
| 151 | "indicated separate TPKT data of %hu " |
| 152 | "bytes\n", info->tpkt_len[dir]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 153 | if (info->tpkt_len[dir] <= tcpdatalen) { |
| 154 | /* Yes, there was a TPKT header |
| 155 | * received */ |
| 156 | *data = tpkt; |
| 157 | *datalen = info->tpkt_len[dir]; |
| 158 | *dataoff = 0; |
| 159 | goto out; |
| 160 | } |
| 161 | |
| 162 | /* Fragmented TPKT */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 163 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 164 | goto clear_out; |
| 165 | } |
| 166 | |
| 167 | /* It is not even a TPKT */ |
| 168 | return 0; |
| 169 | } |
| 170 | tpktoff = 0; |
| 171 | } else { /* Next TPKT */ |
| 172 | tpktoff = *dataoff + *datalen; |
| 173 | tcpdatalen -= tpktoff; |
| 174 | if (tcpdatalen <= 4) /* No more TPKT */ |
| 175 | goto clear_out; |
| 176 | tpkt = *data + *datalen; |
| 177 | |
| 178 | /* Validate TPKT identifier */ |
| 179 | if (tpkt[0] != 0x03 || tpkt[1] != 0) |
| 180 | goto clear_out; |
| 181 | } |
| 182 | |
| 183 | /* Validate TPKT length */ |
| 184 | tpktlen = tpkt[2] * 256 + tpkt[3]; |
| 185 | if (tpktlen < 4) |
| 186 | goto clear_out; |
| 187 | if (tpktlen > tcpdatalen) { |
| 188 | if (tcpdatalen == 4) { /* Separate TPKT header */ |
| 189 | /* Netmeeting sends TPKT header and data separately */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 190 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
| 191 | "there will be TPKT data of %hu bytes\n", |
| 192 | tpktlen - 4); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 193 | info->tpkt_len[dir] = tpktlen - 4; |
| 194 | return 0; |
| 195 | } |
| 196 | |
Patrick McHardy | e772c34 | 2010-05-01 18:29:43 +0200 | [diff] [blame] | 197 | pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 198 | goto clear_out; |
| 199 | } |
| 200 | |
| 201 | /* This is the encapsulated data */ |
| 202 | *data = tpkt + 4; |
| 203 | *datalen = tpktlen - 4; |
| 204 | *dataoff = tpktoff + 4; |
| 205 | |
| 206 | out: |
| 207 | /* Clear TPKT length */ |
| 208 | info->tpkt_len[dir] = 0; |
| 209 | return 1; |
| 210 | |
| 211 | clear_out: |
| 212 | info->tpkt_len[dir] = 0; |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | /****************************************************************************/ |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 217 | 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] | 218 | H245_TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 219 | union nf_inet_addr *addr, __be16 *port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 220 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 221 | const unsigned char *p; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 222 | int len; |
| 223 | |
| 224 | if (taddr->choice != eH245_TransportAddress_unicastAddress) |
| 225 | return 0; |
| 226 | |
| 227 | switch (taddr->unicastAddress.choice) { |
| 228 | case eUnicastAddress_iPAddress: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 229 | if (nf_ct_l3num(ct) != AF_INET) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 230 | return 0; |
| 231 | p = data + taddr->unicastAddress.iPAddress.network; |
| 232 | len = 4; |
| 233 | break; |
| 234 | case eUnicastAddress_iP6Address: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 235 | if (nf_ct_l3num(ct) != AF_INET6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 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 */ |
Pablo Neira Ayuso | d109e9a | 2012-06-04 13:31:04 +0200 | [diff] [blame] | 273 | rtp_port = port & ~htons(1); |
| 274 | rtcp_port = port | htons(1); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 275 | |
| 276 | /* Create expect for RTP */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 277 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 278 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 279 | nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 280 | &ct->tuplehash[!dir].tuple.src.u3, |
| 281 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 282 | IPPROTO_UDP, NULL, &rtp_port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 283 | |
| 284 | /* Create expect for RTCP */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 285 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
| 286 | nf_ct_expect_put(rtp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 287 | return -1; |
| 288 | } |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 289 | nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 290 | &ct->tuplehash[!dir].tuple.src.u3, |
| 291 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 292 | IPPROTO_UDP, NULL, &rtcp_port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 293 | |
| 294 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 295 | &ct->tuplehash[!dir].tuple.dst.u3, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 296 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 297 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && |
| 298 | ct->status & IPS_NAT_MASK) { |
| 299 | /* NAT needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 300 | ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 301 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
| 302 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 303 | if (nf_ct_expect_related(rtp_exp) == 0) { |
| 304 | if (nf_ct_expect_related(rtcp_exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 305 | pr_debug("nf_ct_h323: expect RTP "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 306 | nf_ct_dump_tuple(&rtp_exp->tuple); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 307 | pr_debug("nf_ct_h323: expect RTCP "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 308 | nf_ct_dump_tuple(&rtcp_exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 309 | } else { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 310 | nf_ct_unexpect_related(rtp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 311 | ret = -1; |
| 312 | } |
| 313 | } else |
| 314 | ret = -1; |
| 315 | } |
| 316 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 317 | nf_ct_expect_put(rtp_exp); |
| 318 | nf_ct_expect_put(rtcp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 319 | |
| 320 | return ret; |
| 321 | } |
| 322 | |
| 323 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 324 | static int expect_t120(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 325 | struct nf_conn *ct, |
| 326 | enum ip_conntrack_info ctinfo, |
| 327 | unsigned char **data, int dataoff, |
| 328 | H245_TransportAddress *taddr) |
| 329 | { |
| 330 | int dir = CTINFO2DIR(ctinfo); |
| 331 | int ret = 0; |
| 332 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 333 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 334 | struct nf_conntrack_expect *exp; |
| 335 | typeof(nat_t120_hook) nat_t120; |
| 336 | |
| 337 | /* Read T.120 address */ |
| 338 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 339 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 340 | port == 0) |
| 341 | return 0; |
| 342 | |
| 343 | /* Create expect for T.120 connections */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 344 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 345 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 346 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 347 | &ct->tuplehash[!dir].tuple.src.u3, |
| 348 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 349 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 350 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
| 351 | |
| 352 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 353 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 354 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 355 | (nat_t120 = rcu_dereference(nat_t120_hook)) && |
| 356 | ct->status & IPS_NAT_MASK) { |
| 357 | /* NAT needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 358 | ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 359 | port, exp); |
| 360 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 361 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 362 | pr_debug("nf_ct_h323: expect T.120 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 363 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 364 | } else |
| 365 | ret = -1; |
| 366 | } |
| 367 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 368 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 369 | |
| 370 | return ret; |
| 371 | } |
| 372 | |
| 373 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 374 | static int process_h245_channel(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 375 | struct nf_conn *ct, |
| 376 | enum ip_conntrack_info ctinfo, |
| 377 | unsigned char **data, int dataoff, |
| 378 | H2250LogicalChannelParameters *channel) |
| 379 | { |
| 380 | int ret; |
| 381 | |
| 382 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { |
| 383 | /* RTP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 384 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 385 | &channel->mediaChannel); |
| 386 | if (ret < 0) |
| 387 | return -1; |
| 388 | } |
| 389 | |
| 390 | if (channel-> |
| 391 | options & eH2250LogicalChannelParameters_mediaControlChannel) { |
| 392 | /* RTCP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 393 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 394 | &channel->mediaControlChannel); |
| 395 | if (ret < 0) |
| 396 | return -1; |
| 397 | } |
| 398 | |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 403 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 404 | enum ip_conntrack_info ctinfo, |
| 405 | unsigned char **data, int dataoff, |
| 406 | OpenLogicalChannel *olc) |
| 407 | { |
| 408 | int ret; |
| 409 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 410 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 411 | |
| 412 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == |
| 413 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) |
| 414 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 415 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 416 | &olc-> |
| 417 | forwardLogicalChannelParameters. |
| 418 | multiplexParameters. |
| 419 | h2250LogicalChannelParameters); |
| 420 | if (ret < 0) |
| 421 | return -1; |
| 422 | } |
| 423 | |
| 424 | if ((olc->options & |
| 425 | eOpenLogicalChannel_reverseLogicalChannelParameters) && |
| 426 | (olc->reverseLogicalChannelParameters.options & |
| 427 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) |
| 428 | && (olc->reverseLogicalChannelParameters.multiplexParameters. |
| 429 | choice == |
| 430 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 431 | { |
| 432 | ret = |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 433 | process_h245_channel(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 434 | &olc-> |
| 435 | reverseLogicalChannelParameters. |
| 436 | multiplexParameters. |
| 437 | h2250LogicalChannelParameters); |
| 438 | if (ret < 0) |
| 439 | return -1; |
| 440 | } |
| 441 | |
| 442 | if ((olc->options & eOpenLogicalChannel_separateStack) && |
| 443 | olc->forwardLogicalChannelParameters.dataType.choice == |
| 444 | eDataType_data && |
| 445 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 446 | choice == eDataApplicationCapability_application_t120 && |
| 447 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 448 | t120.choice == eDataProtocolCapability_separateLANStack && |
| 449 | olc->separateStack.networkAddress.choice == |
| 450 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 451 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 452 | &olc->separateStack.networkAddress. |
| 453 | localAreaAddress); |
| 454 | if (ret < 0) |
| 455 | return -1; |
| 456 | } |
| 457 | |
| 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 462 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 463 | enum ip_conntrack_info ctinfo, |
| 464 | unsigned char **data, int dataoff, |
| 465 | OpenLogicalChannelAck *olca) |
| 466 | { |
| 467 | H2250LogicalChannelAckParameters *ack; |
| 468 | int ret; |
| 469 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 470 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 471 | |
| 472 | if ((olca->options & |
| 473 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && |
| 474 | (olca->reverseLogicalChannelParameters.options & |
| 475 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) |
| 476 | && (olca->reverseLogicalChannelParameters.multiplexParameters. |
| 477 | choice == |
| 478 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 479 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 480 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 481 | &olca-> |
| 482 | reverseLogicalChannelParameters. |
| 483 | multiplexParameters. |
| 484 | h2250LogicalChannelParameters); |
| 485 | if (ret < 0) |
| 486 | return -1; |
| 487 | } |
| 488 | |
| 489 | if ((olca->options & |
| 490 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && |
| 491 | (olca->forwardMultiplexAckParameters.choice == |
| 492 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) |
| 493 | { |
| 494 | ack = &olca->forwardMultiplexAckParameters. |
| 495 | h2250LogicalChannelAckParameters; |
| 496 | if (ack->options & |
| 497 | eH2250LogicalChannelAckParameters_mediaChannel) { |
| 498 | /* RTP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 499 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 500 | &ack->mediaChannel); |
| 501 | if (ret < 0) |
| 502 | return -1; |
| 503 | } |
| 504 | |
| 505 | if (ack->options & |
| 506 | eH2250LogicalChannelAckParameters_mediaControlChannel) { |
| 507 | /* RTCP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 508 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 509 | &ack->mediaControlChannel); |
| 510 | if (ret < 0) |
| 511 | return -1; |
| 512 | } |
| 513 | } |
| 514 | |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 515 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
| 516 | olca->separateStack.networkAddress.choice == |
| 517 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 518 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 519 | &olca->separateStack.networkAddress. |
| 520 | localAreaAddress); |
| 521 | if (ret < 0) |
| 522 | return -1; |
| 523 | } |
| 524 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 525 | return 0; |
| 526 | } |
| 527 | |
| 528 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 529 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 530 | enum ip_conntrack_info ctinfo, |
| 531 | unsigned char **data, int dataoff, |
| 532 | MultimediaSystemControlMessage *mscm) |
| 533 | { |
| 534 | switch (mscm->choice) { |
| 535 | case eMultimediaSystemControlMessage_request: |
| 536 | if (mscm->request.choice == |
| 537 | eRequestMessage_openLogicalChannel) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 538 | return process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 539 | &mscm->request.openLogicalChannel); |
| 540 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 541 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
| 542 | mscm->request.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 543 | break; |
| 544 | case eMultimediaSystemControlMessage_response: |
| 545 | if (mscm->response.choice == |
| 546 | eResponseMessage_openLogicalChannelAck) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 547 | return process_olca(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 548 | &mscm->response. |
| 549 | openLogicalChannelAck); |
| 550 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 551 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
| 552 | mscm->response.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 553 | break; |
| 554 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 555 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 556 | break; |
| 557 | } |
| 558 | |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 563 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 564 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 565 | { |
| 566 | static MultimediaSystemControlMessage mscm; |
| 567 | unsigned char *data = NULL; |
| 568 | int datalen; |
| 569 | int dataoff; |
| 570 | int ret; |
| 571 | |
| 572 | /* Until there's been traffic both ways, don't look in packets. */ |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 573 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 574 | return NF_ACCEPT; |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 575 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 576 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 577 | |
| 578 | spin_lock_bh(&nf_h323_lock); |
| 579 | |
| 580 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 581 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 582 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 583 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 584 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 585 | |
| 586 | /* Decode H.245 signal */ |
| 587 | ret = DecodeMultimediaSystemControlMessage(data, datalen, |
| 588 | &mscm); |
| 589 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 590 | pr_debug("nf_ct_h245: decoding error: %s\n", |
| 591 | ret == H323_ERROR_BOUND ? |
| 592 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 593 | /* We don't drop when decoding error */ |
| 594 | break; |
| 595 | } |
| 596 | |
| 597 | /* Process H.245 signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 598 | if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 599 | goto drop; |
| 600 | } |
| 601 | |
| 602 | spin_unlock_bh(&nf_h323_lock); |
| 603 | return NF_ACCEPT; |
| 604 | |
| 605 | drop: |
| 606 | spin_unlock_bh(&nf_h323_lock); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 607 | net_info_ratelimited("nf_ct_h245: packet dropped\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 608 | return NF_DROP; |
| 609 | } |
| 610 | |
| 611 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 612 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
| 613 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, |
| 614 | .timeout = 240, |
| 615 | }; |
| 616 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 617 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
| 618 | .name = "H.245", |
| 619 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 620 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 621 | .tuple.src.l3num = AF_UNSPEC, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 622 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 623 | .help = h245_help, |
| 624 | .expect_policy = &h245_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 625 | }; |
| 626 | |
| 627 | /****************************************************************************/ |
| 628 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, |
| 629 | TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 630 | union nf_inet_addr *addr, __be16 *port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 631 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 632 | const unsigned char *p; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 633 | int len; |
| 634 | |
| 635 | switch (taddr->choice) { |
| 636 | case eTransportAddress_ipAddress: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 637 | if (nf_ct_l3num(ct) != AF_INET) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 638 | return 0; |
| 639 | p = data + taddr->ipAddress.ip; |
| 640 | len = 4; |
| 641 | break; |
| 642 | case eTransportAddress_ip6Address: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 643 | if (nf_ct_l3num(ct) != AF_INET6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 644 | return 0; |
Jing Min Zhao | bb80724 | 2007-05-24 16:43:07 -0700 | [diff] [blame] | 645 | p = data + taddr->ip6Address.ip; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 646 | len = 16; |
| 647 | break; |
| 648 | default: |
| 649 | return 0; |
| 650 | } |
| 651 | |
| 652 | memcpy(addr, p, len); |
| 653 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 654 | memcpy(port, p + len, sizeof(__be16)); |
| 655 | |
| 656 | return 1; |
| 657 | } |
| 658 | |
| 659 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 660 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 661 | enum ip_conntrack_info ctinfo, |
| 662 | unsigned char **data, int dataoff, |
| 663 | TransportAddress *taddr) |
| 664 | { |
| 665 | int dir = CTINFO2DIR(ctinfo); |
| 666 | int ret = 0; |
| 667 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 668 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 669 | struct nf_conntrack_expect *exp; |
| 670 | typeof(nat_h245_hook) nat_h245; |
| 671 | |
| 672 | /* Read h245Address */ |
| 673 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || |
| 674 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 675 | port == 0) |
| 676 | return 0; |
| 677 | |
| 678 | /* Create expect for h245 connection */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 679 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 680 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 681 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 682 | &ct->tuplehash[!dir].tuple.src.u3, |
| 683 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 684 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 685 | exp->helper = &nf_conntrack_helper_h245; |
| 686 | |
| 687 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 688 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 689 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 690 | (nat_h245 = rcu_dereference(nat_h245_hook)) && |
| 691 | ct->status & IPS_NAT_MASK) { |
| 692 | /* NAT needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 693 | ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 694 | port, exp); |
| 695 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 696 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 697 | pr_debug("nf_ct_q931: expect H.245 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 698 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 699 | } else |
| 700 | ret = -1; |
| 701 | } |
| 702 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 703 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 704 | |
| 705 | return ret; |
| 706 | } |
| 707 | |
| 708 | /* If the calling party is on the same side of the forward-to party, |
| 709 | * we don't need to track the second call */ |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 710 | static int callforward_do_filter(const union nf_inet_addr *src, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 711 | const union nf_inet_addr *dst, |
| 712 | u_int8_t family) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 713 | { |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 714 | const struct nf_afinfo *afinfo; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 715 | int ret = 0; |
| 716 | |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 717 | /* rcu_read_lock()ed by nf_hook_slow() */ |
| 718 | afinfo = nf_get_afinfo(family); |
| 719 | if (!afinfo) |
| 720 | return 0; |
| 721 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 722 | switch (family) { |
| 723 | case AF_INET: { |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 724 | struct flowi4 fl1, fl2; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 725 | struct rtable *rt1, *rt2; |
| 726 | |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 727 | memset(&fl1, 0, sizeof(fl1)); |
| 728 | fl1.daddr = src->ip; |
| 729 | |
| 730 | memset(&fl2, 0, sizeof(fl2)); |
| 731 | fl2.daddr = dst->ip; |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 732 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 733 | flowi4_to_flowi(&fl1), false)) { |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 734 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 735 | flowi4_to_flowi(&fl2), false)) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 736 | if (rt1->rt_gateway == rt2->rt_gateway && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 737 | rt1->dst.dev == rt2->dst.dev) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 738 | ret = 1; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 739 | dst_release(&rt2->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 740 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 741 | dst_release(&rt1->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 742 | } |
| 743 | break; |
| 744 | } |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 745 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 746 | case AF_INET6: { |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 747 | struct flowi6 fl1, fl2; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 748 | struct rt6_info *rt1, *rt2; |
| 749 | |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 750 | memset(&fl1, 0, sizeof(fl1)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 751 | fl1.daddr = src->in6; |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 752 | |
| 753 | memset(&fl2, 0, sizeof(fl2)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 754 | fl2.daddr = dst->in6; |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 755 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 756 | flowi6_to_flowi(&fl1), false)) { |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 757 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 758 | flowi6_to_flowi(&fl2), false)) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 759 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 760 | sizeof(rt1->rt6i_gateway)) && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 761 | rt1->dst.dev == rt2->dst.dev) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 762 | ret = 1; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 763 | dst_release(&rt2->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 764 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 765 | dst_release(&rt1->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 766 | } |
| 767 | break; |
| 768 | } |
| 769 | #endif |
| 770 | } |
| 771 | return ret; |
| 772 | |
| 773 | } |
| 774 | |
| 775 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 776 | static int expect_callforwarding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 777 | struct nf_conn *ct, |
| 778 | enum ip_conntrack_info ctinfo, |
| 779 | unsigned char **data, int dataoff, |
| 780 | TransportAddress *taddr) |
| 781 | { |
| 782 | int dir = CTINFO2DIR(ctinfo); |
| 783 | int ret = 0; |
| 784 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 785 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 786 | struct nf_conntrack_expect *exp; |
| 787 | typeof(nat_callforwarding_hook) nat_callforwarding; |
| 788 | |
| 789 | /* Read alternativeAddress */ |
| 790 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) |
| 791 | return 0; |
| 792 | |
| 793 | /* If the calling party is on the same side of the forward-to party, |
| 794 | * we don't need to track the second call */ |
| 795 | if (callforward_filter && |
| 796 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 797 | nf_ct_l3num(ct))) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 798 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 799 | return 0; |
| 800 | } |
| 801 | |
| 802 | /* Create expect for the second call leg */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 803 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 804 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 805 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 806 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 807 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 808 | exp->helper = nf_conntrack_helper_q931; |
| 809 | |
| 810 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 811 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 812 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 813 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && |
| 814 | ct->status & IPS_NAT_MASK) { |
| 815 | /* Need NAT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 816 | ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 817 | taddr, port, exp); |
| 818 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 819 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 820 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 821 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 822 | } else |
| 823 | ret = -1; |
| 824 | } |
| 825 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 826 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 827 | |
| 828 | return ret; |
| 829 | } |
| 830 | |
| 831 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 832 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 833 | enum ip_conntrack_info ctinfo, |
| 834 | unsigned char **data, int dataoff, |
| 835 | Setup_UUIE *setup) |
| 836 | { |
| 837 | int dir = CTINFO2DIR(ctinfo); |
| 838 | int ret; |
| 839 | int i; |
| 840 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 841 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 842 | typeof(set_h225_addr_hook) set_h225_addr; |
| 843 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 844 | pr_debug("nf_ct_q931: Setup\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 845 | |
| 846 | if (setup->options & eSetup_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 847 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 848 | &setup->h245Address); |
| 849 | if (ret < 0) |
| 850 | return -1; |
| 851 | } |
| 852 | |
| 853 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 854 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && |
Roel Kluin | 6aebb9b | 2008-03-20 15:06:23 -0700 | [diff] [blame] | 855 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 856 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 857 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 858 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 859 | pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 860 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 861 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 862 | ret = set_h225_addr(skb, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 863 | &setup->destCallSignalAddress, |
| 864 | &ct->tuplehash[!dir].tuple.src.u3, |
| 865 | ct->tuplehash[!dir].tuple.src.u.tcp.port); |
| 866 | if (ret < 0) |
| 867 | return -1; |
| 868 | } |
| 869 | |
| 870 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && |
| 871 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
| 872 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 873 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 874 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 875 | pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 876 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 877 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 878 | ret = set_h225_addr(skb, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 879 | &setup->sourceCallSignalAddress, |
| 880 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 881 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); |
| 882 | if (ret < 0) |
| 883 | return -1; |
| 884 | } |
| 885 | |
| 886 | if (setup->options & eSetup_UUIE_fastStart) { |
| 887 | for (i = 0; i < setup->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 888 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 889 | &setup->fastStart.item[i]); |
| 890 | if (ret < 0) |
| 891 | return -1; |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | return 0; |
| 896 | } |
| 897 | |
| 898 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 899 | static int process_callproceeding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 900 | struct nf_conn *ct, |
| 901 | enum ip_conntrack_info ctinfo, |
| 902 | unsigned char **data, int dataoff, |
| 903 | CallProceeding_UUIE *callproc) |
| 904 | { |
| 905 | int ret; |
| 906 | int i; |
| 907 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 908 | pr_debug("nf_ct_q931: CallProceeding\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 909 | |
| 910 | if (callproc->options & eCallProceeding_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 911 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 912 | &callproc->h245Address); |
| 913 | if (ret < 0) |
| 914 | return -1; |
| 915 | } |
| 916 | |
| 917 | if (callproc->options & eCallProceeding_UUIE_fastStart) { |
| 918 | for (i = 0; i < callproc->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 919 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 920 | &callproc->fastStart.item[i]); |
| 921 | if (ret < 0) |
| 922 | return -1; |
| 923 | } |
| 924 | } |
| 925 | |
| 926 | return 0; |
| 927 | } |
| 928 | |
| 929 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 930 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 931 | enum ip_conntrack_info ctinfo, |
| 932 | unsigned char **data, int dataoff, |
| 933 | Connect_UUIE *connect) |
| 934 | { |
| 935 | int ret; |
| 936 | int i; |
| 937 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 938 | pr_debug("nf_ct_q931: Connect\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 939 | |
| 940 | if (connect->options & eConnect_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 941 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 942 | &connect->h245Address); |
| 943 | if (ret < 0) |
| 944 | return -1; |
| 945 | } |
| 946 | |
| 947 | if (connect->options & eConnect_UUIE_fastStart) { |
| 948 | for (i = 0; i < connect->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 949 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 950 | &connect->fastStart.item[i]); |
| 951 | if (ret < 0) |
| 952 | return -1; |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | return 0; |
| 957 | } |
| 958 | |
| 959 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 960 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 961 | enum ip_conntrack_info ctinfo, |
| 962 | unsigned char **data, int dataoff, |
| 963 | Alerting_UUIE *alert) |
| 964 | { |
| 965 | int ret; |
| 966 | int i; |
| 967 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 968 | pr_debug("nf_ct_q931: Alerting\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 969 | |
| 970 | if (alert->options & eAlerting_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 971 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 972 | &alert->h245Address); |
| 973 | if (ret < 0) |
| 974 | return -1; |
| 975 | } |
| 976 | |
| 977 | if (alert->options & eAlerting_UUIE_fastStart) { |
| 978 | for (i = 0; i < alert->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 979 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 980 | &alert->fastStart.item[i]); |
| 981 | if (ret < 0) |
| 982 | return -1; |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | return 0; |
| 987 | } |
| 988 | |
| 989 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 990 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 991 | enum ip_conntrack_info ctinfo, |
| 992 | unsigned char **data, int dataoff, |
| 993 | Facility_UUIE *facility) |
| 994 | { |
| 995 | int ret; |
| 996 | int i; |
| 997 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 998 | pr_debug("nf_ct_q931: Facility\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 999 | |
| 1000 | if (facility->reason.choice == eFacilityReason_callForwarded) { |
| 1001 | if (facility->options & eFacility_UUIE_alternativeAddress) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1002 | return expect_callforwarding(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1003 | dataoff, |
| 1004 | &facility-> |
| 1005 | alternativeAddress); |
| 1006 | return 0; |
| 1007 | } |
| 1008 | |
| 1009 | if (facility->options & eFacility_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1010 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1011 | &facility->h245Address); |
| 1012 | if (ret < 0) |
| 1013 | return -1; |
| 1014 | } |
| 1015 | |
| 1016 | if (facility->options & eFacility_UUIE_fastStart) { |
| 1017 | for (i = 0; i < facility->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1018 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1019 | &facility->fastStart.item[i]); |
| 1020 | if (ret < 0) |
| 1021 | return -1; |
| 1022 | } |
| 1023 | } |
| 1024 | |
| 1025 | return 0; |
| 1026 | } |
| 1027 | |
| 1028 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1029 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1030 | enum ip_conntrack_info ctinfo, |
| 1031 | unsigned char **data, int dataoff, |
| 1032 | Progress_UUIE *progress) |
| 1033 | { |
| 1034 | int ret; |
| 1035 | int i; |
| 1036 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1037 | pr_debug("nf_ct_q931: Progress\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1038 | |
| 1039 | if (progress->options & eProgress_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1040 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1041 | &progress->h245Address); |
| 1042 | if (ret < 0) |
| 1043 | return -1; |
| 1044 | } |
| 1045 | |
| 1046 | if (progress->options & eProgress_UUIE_fastStart) { |
| 1047 | for (i = 0; i < progress->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1048 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1049 | &progress->fastStart.item[i]); |
| 1050 | if (ret < 0) |
| 1051 | return -1; |
| 1052 | } |
| 1053 | } |
| 1054 | |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
| 1058 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1059 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1060 | enum ip_conntrack_info ctinfo, |
| 1061 | unsigned char **data, int dataoff, Q931 *q931) |
| 1062 | { |
| 1063 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; |
| 1064 | int i; |
| 1065 | int ret = 0; |
| 1066 | |
| 1067 | switch (pdu->h323_message_body.choice) { |
| 1068 | case eH323_UU_PDU_h323_message_body_setup: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1069 | ret = process_setup(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1070 | &pdu->h323_message_body.setup); |
| 1071 | break; |
| 1072 | case eH323_UU_PDU_h323_message_body_callProceeding: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1073 | ret = process_callproceeding(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1074 | &pdu->h323_message_body. |
| 1075 | callProceeding); |
| 1076 | break; |
| 1077 | case eH323_UU_PDU_h323_message_body_connect: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1078 | ret = process_connect(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1079 | &pdu->h323_message_body.connect); |
| 1080 | break; |
| 1081 | case eH323_UU_PDU_h323_message_body_alerting: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1082 | ret = process_alerting(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1083 | &pdu->h323_message_body.alerting); |
| 1084 | break; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1085 | case eH323_UU_PDU_h323_message_body_facility: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1086 | ret = process_facility(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1087 | &pdu->h323_message_body.facility); |
| 1088 | break; |
| 1089 | case eH323_UU_PDU_h323_message_body_progress: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1090 | ret = process_progress(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1091 | &pdu->h323_message_body.progress); |
| 1092 | break; |
| 1093 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1094 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
| 1095 | pdu->h323_message_body.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1096 | break; |
| 1097 | } |
| 1098 | |
| 1099 | if (ret < 0) |
| 1100 | return -1; |
| 1101 | |
| 1102 | if (pdu->options & eH323_UU_PDU_h245Control) { |
| 1103 | for (i = 0; i < pdu->h245Control.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1104 | ret = process_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1105 | &pdu->h245Control.item[i]); |
| 1106 | if (ret < 0) |
| 1107 | return -1; |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | return 0; |
| 1112 | } |
| 1113 | |
| 1114 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1115 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1116 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1117 | { |
| 1118 | static Q931 q931; |
| 1119 | unsigned char *data = NULL; |
| 1120 | int datalen; |
| 1121 | int dataoff; |
| 1122 | int ret; |
| 1123 | |
| 1124 | /* Until there's been traffic both ways, don't look in packets. */ |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1125 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1126 | return NF_ACCEPT; |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1127 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1128 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1129 | |
| 1130 | spin_lock_bh(&nf_h323_lock); |
| 1131 | |
| 1132 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1133 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1134 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1135 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1136 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1137 | |
| 1138 | /* Decode Q.931 signal */ |
| 1139 | ret = DecodeQ931(data, datalen, &q931); |
| 1140 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1141 | pr_debug("nf_ct_q931: decoding error: %s\n", |
| 1142 | ret == H323_ERROR_BOUND ? |
| 1143 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1144 | /* We don't drop when decoding error */ |
| 1145 | break; |
| 1146 | } |
| 1147 | |
| 1148 | /* Process Q.931 signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1149 | if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1150 | goto drop; |
| 1151 | } |
| 1152 | |
| 1153 | spin_unlock_bh(&nf_h323_lock); |
| 1154 | return NF_ACCEPT; |
| 1155 | |
| 1156 | drop: |
| 1157 | spin_unlock_bh(&nf_h323_lock); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1158 | net_info_ratelimited("nf_ct_q931: packet dropped\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1159 | return NF_DROP; |
| 1160 | } |
| 1161 | |
| 1162 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1163 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
| 1164 | /* T.120 and H.245 */ |
| 1165 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, |
| 1166 | .timeout = 240, |
| 1167 | }; |
| 1168 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1169 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
| 1170 | { |
| 1171 | .name = "Q.931", |
| 1172 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1173 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1174 | .tuple.src.l3num = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1175 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1176 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1177 | .help = q931_help, |
| 1178 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1179 | }, |
| 1180 | { |
| 1181 | .name = "Q.931", |
| 1182 | .me = THIS_MODULE, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1183 | .tuple.src.l3num = AF_INET6, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1184 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1185 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1186 | .help = q931_help, |
| 1187 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1188 | }, |
| 1189 | }; |
| 1190 | |
| 1191 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1192 | 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] | 1193 | int *datalen) |
| 1194 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 1195 | const struct udphdr *uh; |
| 1196 | struct udphdr _uh; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1197 | int dataoff; |
| 1198 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1199 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1200 | if (uh == NULL) |
| 1201 | return NULL; |
| 1202 | dataoff = protoff + sizeof(_uh); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1203 | if (dataoff >= skb->len) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1204 | return NULL; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1205 | *datalen = skb->len - dataoff; |
| 1206 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1207 | } |
| 1208 | |
| 1209 | /****************************************************************************/ |
| 1210 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1211 | union nf_inet_addr *addr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1212 | __be16 port) |
| 1213 | { |
Alexey Dobriyan | 84541cc | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1214 | struct net *net = nf_ct_net(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1215 | struct nf_conntrack_expect *exp; |
| 1216 | struct nf_conntrack_tuple tuple; |
| 1217 | |
| 1218 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); |
| 1219 | tuple.src.u.tcp.port = 0; |
| 1220 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); |
| 1221 | tuple.dst.u.tcp.port = port; |
| 1222 | tuple.dst.protonum = IPPROTO_TCP; |
| 1223 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1224 | exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1225 | if (exp && exp->master == ct) |
| 1226 | return exp; |
| 1227 | return NULL; |
| 1228 | } |
| 1229 | |
| 1230 | /****************************************************************************/ |
| 1231 | static int set_expect_timeout(struct nf_conntrack_expect *exp, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1232 | unsigned int timeout) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1233 | { |
| 1234 | if (!exp || !del_timer(&exp->timeout)) |
| 1235 | return 0; |
| 1236 | |
| 1237 | exp->timeout.expires = jiffies + timeout * HZ; |
| 1238 | add_timer(&exp->timeout); |
| 1239 | |
| 1240 | return 1; |
| 1241 | } |
| 1242 | |
| 1243 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1244 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1245 | enum ip_conntrack_info ctinfo, |
| 1246 | unsigned char **data, |
| 1247 | TransportAddress *taddr, int count) |
| 1248 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1249 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1250 | int dir = CTINFO2DIR(ctinfo); |
| 1251 | int ret = 0; |
| 1252 | int i; |
| 1253 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1254 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1255 | struct nf_conntrack_expect *exp; |
| 1256 | typeof(nat_q931_hook) nat_q931; |
| 1257 | |
| 1258 | /* Look for the first related address */ |
| 1259 | for (i = 0; i < count; i++) { |
| 1260 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && |
| 1261 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1262 | sizeof(addr)) == 0 && port != 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1263 | break; |
| 1264 | } |
| 1265 | |
| 1266 | if (i >= count) /* Not found */ |
| 1267 | return 0; |
| 1268 | |
| 1269 | /* Create expect for Q.931 */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1270 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1271 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1272 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1273 | gkrouted_only ? /* only accept calls from GK? */ |
| 1274 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, |
| 1275 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1276 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1277 | exp->helper = nf_conntrack_helper_q931; |
| 1278 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ |
| 1279 | |
| 1280 | nat_q931 = rcu_dereference(nat_q931_hook); |
| 1281 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1282 | ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1283 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1284 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1285 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1286 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1287 | |
| 1288 | /* Save port for looking up expect in processing RCF */ |
| 1289 | info->sig_port[dir] = port; |
| 1290 | } else |
| 1291 | ret = -1; |
| 1292 | } |
| 1293 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1294 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1295 | |
| 1296 | return ret; |
| 1297 | } |
| 1298 | |
| 1299 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1300 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1301 | enum ip_conntrack_info ctinfo, |
| 1302 | unsigned char **data, GatekeeperRequest *grq) |
| 1303 | { |
| 1304 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1305 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1306 | pr_debug("nf_ct_ras: GRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1307 | |
| 1308 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1309 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1310 | return set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1311 | &grq->rasAddress, 1); |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
| 1315 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1316 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1317 | enum ip_conntrack_info ctinfo, |
| 1318 | unsigned char **data, GatekeeperConfirm *gcf) |
| 1319 | { |
| 1320 | int dir = CTINFO2DIR(ctinfo); |
| 1321 | int ret = 0; |
| 1322 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1323 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1324 | struct nf_conntrack_expect *exp; |
| 1325 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1326 | pr_debug("nf_ct_ras: GCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1327 | |
| 1328 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) |
| 1329 | return 0; |
| 1330 | |
| 1331 | /* Registration port is the same as discovery port */ |
| 1332 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1333 | port == ct->tuplehash[dir].tuple.src.u.udp.port) |
| 1334 | return 0; |
| 1335 | |
| 1336 | /* Avoid RAS expectation loops. A GCF is never expected. */ |
| 1337 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
| 1338 | return 0; |
| 1339 | |
| 1340 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1341 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1342 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1343 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1344 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1345 | IPPROTO_UDP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1346 | exp->helper = nf_conntrack_helper_ras; |
| 1347 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1348 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1349 | pr_debug("nf_ct_ras: expect RAS "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1350 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1351 | } else |
| 1352 | ret = -1; |
| 1353 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1354 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1355 | |
| 1356 | return ret; |
| 1357 | } |
| 1358 | |
| 1359 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1360 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1361 | enum ip_conntrack_info ctinfo, |
| 1362 | unsigned char **data, RegistrationRequest *rrq) |
| 1363 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1364 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1365 | int ret; |
| 1366 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1367 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1368 | pr_debug("nf_ct_ras: RRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1369 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1370 | ret = expect_q931(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1371 | rrq->callSignalAddress.item, |
| 1372 | rrq->callSignalAddress.count); |
| 1373 | if (ret < 0) |
| 1374 | return -1; |
| 1375 | |
| 1376 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1377 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1378 | ret = set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1379 | rrq->rasAddress.item, |
| 1380 | rrq->rasAddress.count); |
| 1381 | if (ret < 0) |
| 1382 | return -1; |
| 1383 | } |
| 1384 | |
| 1385 | if (rrq->options & eRegistrationRequest_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1386 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1387 | info->timeout = rrq->timeToLive; |
| 1388 | } else |
| 1389 | info->timeout = default_rrq_ttl; |
| 1390 | |
| 1391 | return 0; |
| 1392 | } |
| 1393 | |
| 1394 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1395 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1396 | enum ip_conntrack_info ctinfo, |
| 1397 | unsigned char **data, RegistrationConfirm *rcf) |
| 1398 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1399 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1400 | int dir = CTINFO2DIR(ctinfo); |
| 1401 | int ret; |
| 1402 | struct nf_conntrack_expect *exp; |
| 1403 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1404 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1405 | pr_debug("nf_ct_ras: RCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1406 | |
| 1407 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1408 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1409 | ret = set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1410 | rcf->callSignalAddress.item, |
| 1411 | rcf->callSignalAddress.count); |
| 1412 | if (ret < 0) |
| 1413 | return -1; |
| 1414 | } |
| 1415 | |
| 1416 | if (rcf->options & eRegistrationConfirm_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1417 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1418 | info->timeout = rcf->timeToLive; |
| 1419 | } |
| 1420 | |
| 1421 | if (info->timeout > 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1422 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
| 1423 | "%u seconds\n", info->timeout); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1424 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1425 | |
| 1426 | /* Set expect timeout */ |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1427 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1428 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
| 1429 | info->sig_port[!dir]); |
| 1430 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1431 | pr_debug("nf_ct_ras: set Q.931 expect " |
| 1432 | "timeout to %u seconds for", |
| 1433 | info->timeout); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1434 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1435 | set_expect_timeout(exp, info->timeout); |
| 1436 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1437 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1438 | } |
| 1439 | |
| 1440 | return 0; |
| 1441 | } |
| 1442 | |
| 1443 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1444 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1445 | enum ip_conntrack_info ctinfo, |
| 1446 | unsigned char **data, UnregistrationRequest *urq) |
| 1447 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1448 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1449 | int dir = CTINFO2DIR(ctinfo); |
| 1450 | int ret; |
| 1451 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1452 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1453 | pr_debug("nf_ct_ras: URQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1454 | |
| 1455 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1456 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1457 | ret = set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1458 | urq->callSignalAddress.item, |
| 1459 | urq->callSignalAddress.count); |
| 1460 | if (ret < 0) |
| 1461 | return -1; |
| 1462 | } |
| 1463 | |
| 1464 | /* Clear old expect */ |
| 1465 | nf_ct_remove_expectations(ct); |
| 1466 | info->sig_port[dir] = 0; |
| 1467 | info->sig_port[!dir] = 0; |
| 1468 | |
| 1469 | /* Give it 30 seconds for UCF or URJ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1470 | nf_ct_refresh(ct, skb, 30 * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1471 | |
| 1472 | return 0; |
| 1473 | } |
| 1474 | |
| 1475 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1476 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1477 | enum ip_conntrack_info ctinfo, |
| 1478 | unsigned char **data, AdmissionRequest *arq) |
| 1479 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1480 | const struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1481 | int dir = CTINFO2DIR(ctinfo); |
| 1482 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1483 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1484 | typeof(set_h225_addr_hook) set_h225_addr; |
| 1485 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1486 | pr_debug("nf_ct_ras: ARQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1487 | |
| 1488 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 1489 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && |
| 1490 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1491 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1492 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1493 | port == info->sig_port[dir] && |
| 1494 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
| 1495 | /* Answering ARQ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1496 | return set_h225_addr(skb, data, 0, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1497 | &arq->destCallSignalAddress, |
| 1498 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1499 | info->sig_port[!dir]); |
| 1500 | } |
| 1501 | |
| 1502 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && |
| 1503 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1504 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1505 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1506 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
| 1507 | /* Calling ARQ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1508 | return set_h225_addr(skb, data, 0, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1509 | &arq->srcCallSignalAddress, |
| 1510 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1511 | port); |
| 1512 | } |
| 1513 | |
| 1514 | return 0; |
| 1515 | } |
| 1516 | |
| 1517 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1518 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1519 | enum ip_conntrack_info ctinfo, |
| 1520 | unsigned char **data, AdmissionConfirm *acf) |
| 1521 | { |
| 1522 | int dir = CTINFO2DIR(ctinfo); |
| 1523 | int ret = 0; |
| 1524 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1525 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1526 | struct nf_conntrack_expect *exp; |
| 1527 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1528 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1529 | pr_debug("nf_ct_ras: ACF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1530 | |
| 1531 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, |
| 1532 | &addr, &port)) |
| 1533 | return 0; |
| 1534 | |
| 1535 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { |
| 1536 | /* Answering ACF */ |
| 1537 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1538 | if (set_sig_addr && ct->status & IPS_NAT_MASK) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1539 | return set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1540 | &acf->destCallSignalAddress, 1); |
| 1541 | return 0; |
| 1542 | } |
| 1543 | |
| 1544 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1545 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1546 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1547 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1548 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1549 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1550 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1551 | exp->helper = nf_conntrack_helper_q931; |
| 1552 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1553 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1554 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1555 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1556 | } else |
| 1557 | ret = -1; |
| 1558 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1559 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1560 | |
| 1561 | return ret; |
| 1562 | } |
| 1563 | |
| 1564 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1565 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1566 | enum ip_conntrack_info ctinfo, |
| 1567 | unsigned char **data, LocationRequest *lrq) |
| 1568 | { |
| 1569 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1570 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1571 | pr_debug("nf_ct_ras: LRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1572 | |
| 1573 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1574 | if (set_ras_addr && ct->status & IPS_NAT_MASK) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1575 | return set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1576 | &lrq->replyAddress, 1); |
| 1577 | return 0; |
| 1578 | } |
| 1579 | |
| 1580 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1581 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1582 | enum ip_conntrack_info ctinfo, |
| 1583 | unsigned char **data, LocationConfirm *lcf) |
| 1584 | { |
| 1585 | int dir = CTINFO2DIR(ctinfo); |
| 1586 | int ret = 0; |
| 1587 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1588 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1589 | struct nf_conntrack_expect *exp; |
| 1590 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1591 | pr_debug("nf_ct_ras: LCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1592 | |
| 1593 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, |
| 1594 | &addr, &port)) |
| 1595 | return 0; |
| 1596 | |
| 1597 | /* Need new expect for call signal */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1598 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1599 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1600 | nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1601 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1602 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1603 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1604 | exp->helper = nf_conntrack_helper_q931; |
| 1605 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1606 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1607 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1608 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1609 | } else |
| 1610 | ret = -1; |
| 1611 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1612 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1613 | |
| 1614 | /* Ignore rasAddress */ |
| 1615 | |
| 1616 | return ret; |
| 1617 | } |
| 1618 | |
| 1619 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1620 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1621 | enum ip_conntrack_info ctinfo, |
| 1622 | unsigned char **data, InfoRequestResponse *irr) |
| 1623 | { |
| 1624 | int ret; |
| 1625 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1626 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1627 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1628 | pr_debug("nf_ct_ras: IRR\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1629 | |
| 1630 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1631 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1632 | ret = set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1633 | &irr->rasAddress, 1); |
| 1634 | if (ret < 0) |
| 1635 | return -1; |
| 1636 | } |
| 1637 | |
| 1638 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1639 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1640 | ret = set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1641 | irr->callSignalAddress.item, |
| 1642 | irr->callSignalAddress.count); |
| 1643 | if (ret < 0) |
| 1644 | return -1; |
| 1645 | } |
| 1646 | |
| 1647 | return 0; |
| 1648 | } |
| 1649 | |
| 1650 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1651 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1652 | enum ip_conntrack_info ctinfo, |
| 1653 | unsigned char **data, RasMessage *ras) |
| 1654 | { |
| 1655 | switch (ras->choice) { |
| 1656 | case eRasMessage_gatekeeperRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1657 | return process_grq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1658 | &ras->gatekeeperRequest); |
| 1659 | case eRasMessage_gatekeeperConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1660 | return process_gcf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1661 | &ras->gatekeeperConfirm); |
| 1662 | case eRasMessage_registrationRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1663 | return process_rrq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1664 | &ras->registrationRequest); |
| 1665 | case eRasMessage_registrationConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1666 | return process_rcf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1667 | &ras->registrationConfirm); |
| 1668 | case eRasMessage_unregistrationRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1669 | return process_urq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1670 | &ras->unregistrationRequest); |
| 1671 | case eRasMessage_admissionRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1672 | return process_arq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1673 | &ras->admissionRequest); |
| 1674 | case eRasMessage_admissionConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1675 | return process_acf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1676 | &ras->admissionConfirm); |
| 1677 | case eRasMessage_locationRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1678 | return process_lrq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1679 | &ras->locationRequest); |
| 1680 | case eRasMessage_locationConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1681 | return process_lcf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1682 | &ras->locationConfirm); |
| 1683 | case eRasMessage_infoRequestResponse: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1684 | return process_irr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1685 | &ras->infoRequestResponse); |
| 1686 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1687 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1688 | break; |
| 1689 | } |
| 1690 | |
| 1691 | return 0; |
| 1692 | } |
| 1693 | |
| 1694 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1695 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1696 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1697 | { |
| 1698 | static RasMessage ras; |
| 1699 | unsigned char *data; |
| 1700 | int datalen = 0; |
| 1701 | int ret; |
| 1702 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1703 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1704 | |
| 1705 | spin_lock_bh(&nf_h323_lock); |
| 1706 | |
| 1707 | /* Get UDP data */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1708 | data = get_udp_data(skb, protoff, &datalen); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1709 | if (data == NULL) |
| 1710 | goto accept; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1711 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1712 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1713 | |
| 1714 | /* Decode RAS message */ |
| 1715 | ret = DecodeRasMessage(data, datalen, &ras); |
| 1716 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1717 | pr_debug("nf_ct_ras: decoding error: %s\n", |
| 1718 | ret == H323_ERROR_BOUND ? |
| 1719 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1720 | goto accept; |
| 1721 | } |
| 1722 | |
| 1723 | /* Process RAS message */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1724 | if (process_ras(skb, ct, ctinfo, &data, &ras) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1725 | goto drop; |
| 1726 | |
| 1727 | accept: |
| 1728 | spin_unlock_bh(&nf_h323_lock); |
| 1729 | return NF_ACCEPT; |
| 1730 | |
| 1731 | drop: |
| 1732 | spin_unlock_bh(&nf_h323_lock); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1733 | net_info_ratelimited("nf_ct_ras: packet dropped\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1734 | return NF_DROP; |
| 1735 | } |
| 1736 | |
| 1737 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1738 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
| 1739 | .max_expected = 32, |
| 1740 | .timeout = 240, |
| 1741 | }; |
| 1742 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1743 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
| 1744 | { |
| 1745 | .name = "RAS", |
| 1746 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1747 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1748 | .tuple.src.l3num = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1749 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1750 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1751 | .help = ras_help, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1752 | .expect_policy = &ras_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1753 | }, |
| 1754 | { |
| 1755 | .name = "RAS", |
| 1756 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1757 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1758 | .tuple.src.l3num = AF_INET6, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1759 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1760 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1761 | .help = ras_help, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1762 | .expect_policy = &ras_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1763 | }, |
| 1764 | }; |
| 1765 | |
| 1766 | /****************************************************************************/ |
| 1767 | static void __exit nf_conntrack_h323_fini(void) |
| 1768 | { |
| 1769 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); |
| 1770 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
| 1771 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
| 1772 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1773 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1774 | kfree(h323_buffer); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1775 | pr_debug("nf_ct_h323: fini\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1776 | } |
| 1777 | |
| 1778 | /****************************************************************************/ |
| 1779 | static int __init nf_conntrack_h323_init(void) |
| 1780 | { |
| 1781 | int ret; |
| 1782 | |
| 1783 | h323_buffer = kmalloc(65536, GFP_KERNEL); |
| 1784 | if (!h323_buffer) |
| 1785 | return -ENOMEM; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1786 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1787 | if (ret < 0) |
| 1788 | goto err1; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1789 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1790 | if (ret < 0) |
| 1791 | goto err2; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1792 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1793 | if (ret < 0) |
| 1794 | goto err3; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1795 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1796 | if (ret < 0) |
| 1797 | goto err4; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1798 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); |
| 1799 | if (ret < 0) |
| 1800 | goto err5; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1801 | pr_debug("nf_ct_h323: init success\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1802 | return 0; |
| 1803 | |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1804 | err5: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1805 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1806 | err4: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1807 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1808 | err3: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1809 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1810 | err2: |
| 1811 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1812 | err1: |
Patrick McHardy | 8a54886 | 2008-06-17 15:52:07 -0700 | [diff] [blame] | 1813 | kfree(h323_buffer); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1814 | return ret; |
| 1815 | } |
| 1816 | |
| 1817 | /****************************************************************************/ |
| 1818 | module_init(nf_conntrack_h323_init); |
| 1819 | module_exit(nf_conntrack_h323_fini); |
| 1820 | |
| 1821 | EXPORT_SYMBOL_GPL(get_h225_addr); |
| 1822 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); |
| 1823 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); |
| 1824 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); |
| 1825 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); |
| 1826 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); |
| 1827 | EXPORT_SYMBOL_GPL(nat_t120_hook); |
| 1828 | EXPORT_SYMBOL_GPL(nat_h245_hook); |
| 1829 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); |
| 1830 | EXPORT_SYMBOL_GPL(nat_q931_hook); |
| 1831 | |
| 1832 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); |
| 1833 | MODULE_DESCRIPTION("H.323 connection tracking helper"); |
| 1834 | MODULE_LICENSE("GPL"); |
| 1835 | MODULE_ALIAS("ip_conntrack_h323"); |
Pablo Neira Ayuso | be3eed2 | 2012-05-14 00:42:02 +0200 | [diff] [blame] | 1836 | MODULE_ALIAS_NFCT_HELPER("RAS"); |
| 1837 | MODULE_ALIAS_NFCT_HELPER("Q.931"); |
| 1838 | MODULE_ALIAS_NFCT_HELPER("H.245"); |