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)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 298 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 299 | ct->status & IPS_NAT_MASK) { |
| 300 | /* NAT needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 301 | ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 302 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
| 303 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 304 | if (nf_ct_expect_related(rtp_exp) == 0) { |
| 305 | if (nf_ct_expect_related(rtcp_exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 306 | pr_debug("nf_ct_h323: expect RTP "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 307 | nf_ct_dump_tuple(&rtp_exp->tuple); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 308 | pr_debug("nf_ct_h323: expect RTCP "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 309 | nf_ct_dump_tuple(&rtcp_exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 310 | } else { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 311 | nf_ct_unexpect_related(rtp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 312 | ret = -1; |
| 313 | } |
| 314 | } else |
| 315 | ret = -1; |
| 316 | } |
| 317 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 318 | nf_ct_expect_put(rtp_exp); |
| 319 | nf_ct_expect_put(rtcp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 320 | |
| 321 | return ret; |
| 322 | } |
| 323 | |
| 324 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 325 | static int expect_t120(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 326 | struct nf_conn *ct, |
| 327 | enum ip_conntrack_info ctinfo, |
| 328 | unsigned char **data, int dataoff, |
| 329 | H245_TransportAddress *taddr) |
| 330 | { |
| 331 | int dir = CTINFO2DIR(ctinfo); |
| 332 | int ret = 0; |
| 333 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 334 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 335 | struct nf_conntrack_expect *exp; |
| 336 | typeof(nat_t120_hook) nat_t120; |
| 337 | |
| 338 | /* Read T.120 address */ |
| 339 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 340 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 341 | port == 0) |
| 342 | return 0; |
| 343 | |
| 344 | /* Create expect for T.120 connections */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 345 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 346 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 347 | 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] | 348 | &ct->tuplehash[!dir].tuple.src.u3, |
| 349 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 350 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 351 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
| 352 | |
| 353 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 354 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 355 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 356 | (nat_t120 = rcu_dereference(nat_t120_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 357 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 358 | ct->status & IPS_NAT_MASK) { |
| 359 | /* NAT needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 360 | ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 361 | port, exp); |
| 362 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 363 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 364 | pr_debug("nf_ct_h323: expect T.120 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 365 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 366 | } else |
| 367 | ret = -1; |
| 368 | } |
| 369 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 370 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 371 | |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 376 | static int process_h245_channel(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 377 | struct nf_conn *ct, |
| 378 | enum ip_conntrack_info ctinfo, |
| 379 | unsigned char **data, int dataoff, |
| 380 | H2250LogicalChannelParameters *channel) |
| 381 | { |
| 382 | int ret; |
| 383 | |
| 384 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { |
| 385 | /* RTP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 386 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 387 | &channel->mediaChannel); |
| 388 | if (ret < 0) |
| 389 | return -1; |
| 390 | } |
| 391 | |
| 392 | if (channel-> |
| 393 | options & eH2250LogicalChannelParameters_mediaControlChannel) { |
| 394 | /* RTCP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 395 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 396 | &channel->mediaControlChannel); |
| 397 | if (ret < 0) |
| 398 | return -1; |
| 399 | } |
| 400 | |
| 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 405 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 406 | enum ip_conntrack_info ctinfo, |
| 407 | unsigned char **data, int dataoff, |
| 408 | OpenLogicalChannel *olc) |
| 409 | { |
| 410 | int ret; |
| 411 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 412 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 413 | |
| 414 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == |
| 415 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) |
| 416 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 417 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 418 | &olc-> |
| 419 | forwardLogicalChannelParameters. |
| 420 | multiplexParameters. |
| 421 | h2250LogicalChannelParameters); |
| 422 | if (ret < 0) |
| 423 | return -1; |
| 424 | } |
| 425 | |
| 426 | if ((olc->options & |
| 427 | eOpenLogicalChannel_reverseLogicalChannelParameters) && |
| 428 | (olc->reverseLogicalChannelParameters.options & |
| 429 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) |
| 430 | && (olc->reverseLogicalChannelParameters.multiplexParameters. |
| 431 | choice == |
| 432 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 433 | { |
| 434 | ret = |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 435 | process_h245_channel(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 436 | &olc-> |
| 437 | reverseLogicalChannelParameters. |
| 438 | multiplexParameters. |
| 439 | h2250LogicalChannelParameters); |
| 440 | if (ret < 0) |
| 441 | return -1; |
| 442 | } |
| 443 | |
| 444 | if ((olc->options & eOpenLogicalChannel_separateStack) && |
| 445 | olc->forwardLogicalChannelParameters.dataType.choice == |
| 446 | eDataType_data && |
| 447 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 448 | choice == eDataApplicationCapability_application_t120 && |
| 449 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 450 | t120.choice == eDataProtocolCapability_separateLANStack && |
| 451 | olc->separateStack.networkAddress.choice == |
| 452 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 453 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 454 | &olc->separateStack.networkAddress. |
| 455 | localAreaAddress); |
| 456 | if (ret < 0) |
| 457 | return -1; |
| 458 | } |
| 459 | |
| 460 | return 0; |
| 461 | } |
| 462 | |
| 463 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 464 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 465 | enum ip_conntrack_info ctinfo, |
| 466 | unsigned char **data, int dataoff, |
| 467 | OpenLogicalChannelAck *olca) |
| 468 | { |
| 469 | H2250LogicalChannelAckParameters *ack; |
| 470 | int ret; |
| 471 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 472 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 473 | |
| 474 | if ((olca->options & |
| 475 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && |
| 476 | (olca->reverseLogicalChannelParameters.options & |
| 477 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) |
| 478 | && (olca->reverseLogicalChannelParameters.multiplexParameters. |
| 479 | choice == |
| 480 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 481 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 482 | ret = process_h245_channel(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 483 | &olca-> |
| 484 | reverseLogicalChannelParameters. |
| 485 | multiplexParameters. |
| 486 | h2250LogicalChannelParameters); |
| 487 | if (ret < 0) |
| 488 | return -1; |
| 489 | } |
| 490 | |
| 491 | if ((olca->options & |
| 492 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && |
| 493 | (olca->forwardMultiplexAckParameters.choice == |
| 494 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) |
| 495 | { |
| 496 | ack = &olca->forwardMultiplexAckParameters. |
| 497 | h2250LogicalChannelAckParameters; |
| 498 | if (ack->options & |
| 499 | eH2250LogicalChannelAckParameters_mediaChannel) { |
| 500 | /* RTP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 501 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 502 | &ack->mediaChannel); |
| 503 | if (ret < 0) |
| 504 | return -1; |
| 505 | } |
| 506 | |
| 507 | if (ack->options & |
| 508 | eH2250LogicalChannelAckParameters_mediaControlChannel) { |
| 509 | /* RTCP */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 510 | ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 511 | &ack->mediaControlChannel); |
| 512 | if (ret < 0) |
| 513 | return -1; |
| 514 | } |
| 515 | } |
| 516 | |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 517 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
| 518 | olca->separateStack.networkAddress.choice == |
| 519 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 520 | ret = expect_t120(skb, ct, ctinfo, data, dataoff, |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 521 | &olca->separateStack.networkAddress. |
| 522 | localAreaAddress); |
| 523 | if (ret < 0) |
| 524 | return -1; |
| 525 | } |
| 526 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 531 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 532 | enum ip_conntrack_info ctinfo, |
| 533 | unsigned char **data, int dataoff, |
| 534 | MultimediaSystemControlMessage *mscm) |
| 535 | { |
| 536 | switch (mscm->choice) { |
| 537 | case eMultimediaSystemControlMessage_request: |
| 538 | if (mscm->request.choice == |
| 539 | eRequestMessage_openLogicalChannel) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 540 | return process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 541 | &mscm->request.openLogicalChannel); |
| 542 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 543 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
| 544 | mscm->request.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 545 | break; |
| 546 | case eMultimediaSystemControlMessage_response: |
| 547 | if (mscm->response.choice == |
| 548 | eResponseMessage_openLogicalChannelAck) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 549 | return process_olca(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 550 | &mscm->response. |
| 551 | openLogicalChannelAck); |
| 552 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 553 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
| 554 | mscm->response.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 555 | break; |
| 556 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 557 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 558 | break; |
| 559 | } |
| 560 | |
| 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 565 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 566 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 567 | { |
| 568 | static MultimediaSystemControlMessage mscm; |
| 569 | unsigned char *data = NULL; |
| 570 | int datalen; |
| 571 | int dataoff; |
| 572 | int ret; |
| 573 | |
| 574 | /* Until there's been traffic both ways, don't look in packets. */ |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 575 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 576 | return NF_ACCEPT; |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 577 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 578 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 579 | |
| 580 | spin_lock_bh(&nf_h323_lock); |
| 581 | |
| 582 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 583 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 584 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 585 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 586 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 587 | |
| 588 | /* Decode H.245 signal */ |
| 589 | ret = DecodeMultimediaSystemControlMessage(data, datalen, |
| 590 | &mscm); |
| 591 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 592 | pr_debug("nf_ct_h245: decoding error: %s\n", |
| 593 | ret == H323_ERROR_BOUND ? |
| 594 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 595 | /* We don't drop when decoding error */ |
| 596 | break; |
| 597 | } |
| 598 | |
| 599 | /* Process H.245 signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 600 | if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 601 | goto drop; |
| 602 | } |
| 603 | |
| 604 | spin_unlock_bh(&nf_h323_lock); |
| 605 | return NF_ACCEPT; |
| 606 | |
| 607 | drop: |
| 608 | spin_unlock_bh(&nf_h323_lock); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 609 | net_info_ratelimited("nf_ct_h245: packet dropped\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 610 | return NF_DROP; |
| 611 | } |
| 612 | |
| 613 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 614 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
| 615 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, |
| 616 | .timeout = 240, |
| 617 | }; |
| 618 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 619 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
| 620 | .name = "H.245", |
| 621 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 622 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 623 | .tuple.src.l3num = AF_UNSPEC, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 624 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 625 | .help = h245_help, |
| 626 | .expect_policy = &h245_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 627 | }; |
| 628 | |
| 629 | /****************************************************************************/ |
| 630 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, |
| 631 | TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 632 | union nf_inet_addr *addr, __be16 *port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 633 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 634 | const unsigned char *p; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 635 | int len; |
| 636 | |
| 637 | switch (taddr->choice) { |
| 638 | case eTransportAddress_ipAddress: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 639 | if (nf_ct_l3num(ct) != AF_INET) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 640 | return 0; |
| 641 | p = data + taddr->ipAddress.ip; |
| 642 | len = 4; |
| 643 | break; |
| 644 | case eTransportAddress_ip6Address: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 645 | if (nf_ct_l3num(ct) != AF_INET6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 646 | return 0; |
Jing Min Zhao | bb80724 | 2007-05-24 16:43:07 -0700 | [diff] [blame] | 647 | p = data + taddr->ip6Address.ip; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 648 | len = 16; |
| 649 | break; |
| 650 | default: |
| 651 | return 0; |
| 652 | } |
| 653 | |
| 654 | memcpy(addr, p, len); |
| 655 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 656 | memcpy(port, p + len, sizeof(__be16)); |
| 657 | |
| 658 | return 1; |
| 659 | } |
| 660 | |
| 661 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 662 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 663 | enum ip_conntrack_info ctinfo, |
| 664 | unsigned char **data, int dataoff, |
| 665 | TransportAddress *taddr) |
| 666 | { |
| 667 | int dir = CTINFO2DIR(ctinfo); |
| 668 | int ret = 0; |
| 669 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 670 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 671 | struct nf_conntrack_expect *exp; |
| 672 | typeof(nat_h245_hook) nat_h245; |
| 673 | |
| 674 | /* Read h245Address */ |
| 675 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || |
| 676 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 677 | port == 0) |
| 678 | return 0; |
| 679 | |
| 680 | /* Create expect for h245 connection */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 681 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 682 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 683 | 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] | 684 | &ct->tuplehash[!dir].tuple.src.u3, |
| 685 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 686 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 687 | exp->helper = &nf_conntrack_helper_h245; |
| 688 | |
| 689 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 690 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 691 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 692 | (nat_h245 = rcu_dereference(nat_h245_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 693 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 694 | ct->status & IPS_NAT_MASK) { |
| 695 | /* NAT needed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 696 | ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 697 | port, exp); |
| 698 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 699 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 700 | pr_debug("nf_ct_q931: expect H.245 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 701 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 702 | } else |
| 703 | ret = -1; |
| 704 | } |
| 705 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 706 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 707 | |
| 708 | return ret; |
| 709 | } |
| 710 | |
| 711 | /* If the calling party is on the same side of the forward-to party, |
| 712 | * we don't need to track the second call */ |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 713 | static int callforward_do_filter(const union nf_inet_addr *src, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 714 | const union nf_inet_addr *dst, |
| 715 | u_int8_t family) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 716 | { |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 717 | const struct nf_afinfo *afinfo; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 718 | int ret = 0; |
| 719 | |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 720 | /* rcu_read_lock()ed by nf_hook_slow() */ |
| 721 | afinfo = nf_get_afinfo(family); |
| 722 | if (!afinfo) |
| 723 | return 0; |
| 724 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 725 | switch (family) { |
| 726 | case AF_INET: { |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 727 | struct flowi4 fl1, fl2; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 728 | struct rtable *rt1, *rt2; |
| 729 | |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 730 | memset(&fl1, 0, sizeof(fl1)); |
| 731 | fl1.daddr = src->ip; |
| 732 | |
| 733 | memset(&fl2, 0, sizeof(fl2)); |
| 734 | fl2.daddr = dst->ip; |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 735 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 736 | flowi4_to_flowi(&fl1), false)) { |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 737 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 738 | flowi4_to_flowi(&fl2), false)) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 739 | if (rt1->rt_gateway == rt2->rt_gateway && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 740 | rt1->dst.dev == rt2->dst.dev) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 741 | ret = 1; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 742 | dst_release(&rt2->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 743 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 744 | dst_release(&rt1->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 745 | } |
| 746 | break; |
| 747 | } |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 748 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 749 | case AF_INET6: { |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 750 | struct flowi6 fl1, fl2; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 751 | struct rt6_info *rt1, *rt2; |
| 752 | |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 753 | memset(&fl1, 0, sizeof(fl1)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 754 | fl1.daddr = src->in6; |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 755 | |
| 756 | memset(&fl2, 0, sizeof(fl2)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 757 | fl2.daddr = dst->in6; |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 758 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 759 | flowi6_to_flowi(&fl1), false)) { |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 760 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 761 | flowi6_to_flowi(&fl2), false)) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 762 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 763 | sizeof(rt1->rt6i_gateway)) && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 764 | rt1->dst.dev == rt2->dst.dev) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 765 | ret = 1; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 766 | dst_release(&rt2->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 767 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 768 | dst_release(&rt1->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 769 | } |
| 770 | break; |
| 771 | } |
| 772 | #endif |
| 773 | } |
| 774 | return ret; |
| 775 | |
| 776 | } |
| 777 | |
| 778 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 779 | static int expect_callforwarding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 780 | struct nf_conn *ct, |
| 781 | enum ip_conntrack_info ctinfo, |
| 782 | unsigned char **data, int dataoff, |
| 783 | TransportAddress *taddr) |
| 784 | { |
| 785 | int dir = CTINFO2DIR(ctinfo); |
| 786 | int ret = 0; |
| 787 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 788 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 789 | struct nf_conntrack_expect *exp; |
| 790 | typeof(nat_callforwarding_hook) nat_callforwarding; |
| 791 | |
| 792 | /* Read alternativeAddress */ |
| 793 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) |
| 794 | return 0; |
| 795 | |
| 796 | /* If the calling party is on the same side of the forward-to party, |
| 797 | * we don't need to track the second call */ |
| 798 | if (callforward_filter && |
| 799 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 800 | nf_ct_l3num(ct))) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 801 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 802 | return 0; |
| 803 | } |
| 804 | |
| 805 | /* Create expect for the second call leg */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 806 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 807 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 808 | 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] | 809 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 810 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 811 | exp->helper = nf_conntrack_helper_q931; |
| 812 | |
| 813 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 814 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 815 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 816 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 817 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 818 | ct->status & IPS_NAT_MASK) { |
| 819 | /* Need NAT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 820 | ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 821 | taddr, port, exp); |
| 822 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 823 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 824 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 825 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 826 | } else |
| 827 | ret = -1; |
| 828 | } |
| 829 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 830 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 831 | |
| 832 | return ret; |
| 833 | } |
| 834 | |
| 835 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 836 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 837 | enum ip_conntrack_info ctinfo, |
| 838 | unsigned char **data, int dataoff, |
| 839 | Setup_UUIE *setup) |
| 840 | { |
| 841 | int dir = CTINFO2DIR(ctinfo); |
| 842 | int ret; |
| 843 | int i; |
| 844 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 845 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 846 | typeof(set_h225_addr_hook) set_h225_addr; |
| 847 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 848 | pr_debug("nf_ct_q931: Setup\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 849 | |
| 850 | if (setup->options & eSetup_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 851 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 852 | &setup->h245Address); |
| 853 | if (ret < 0) |
| 854 | return -1; |
| 855 | } |
| 856 | |
| 857 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 858 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 859 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 860 | ct->status & IPS_NAT_MASK && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 861 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 862 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 863 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 864 | pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 865 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 866 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 867 | ret = set_h225_addr(skb, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 868 | &setup->destCallSignalAddress, |
| 869 | &ct->tuplehash[!dir].tuple.src.u3, |
| 870 | ct->tuplehash[!dir].tuple.src.u.tcp.port); |
| 871 | if (ret < 0) |
| 872 | return -1; |
| 873 | } |
| 874 | |
| 875 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 876 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 877 | ct->status & IPS_NAT_MASK && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 878 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 879 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 880 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 881 | pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 882 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 883 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 884 | ret = set_h225_addr(skb, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 885 | &setup->sourceCallSignalAddress, |
| 886 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 887 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); |
| 888 | if (ret < 0) |
| 889 | return -1; |
| 890 | } |
| 891 | |
| 892 | if (setup->options & eSetup_UUIE_fastStart) { |
| 893 | for (i = 0; i < setup->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 894 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 895 | &setup->fastStart.item[i]); |
| 896 | if (ret < 0) |
| 897 | return -1; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | return 0; |
| 902 | } |
| 903 | |
| 904 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 905 | static int process_callproceeding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 906 | struct nf_conn *ct, |
| 907 | enum ip_conntrack_info ctinfo, |
| 908 | unsigned char **data, int dataoff, |
| 909 | CallProceeding_UUIE *callproc) |
| 910 | { |
| 911 | int ret; |
| 912 | int i; |
| 913 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 914 | pr_debug("nf_ct_q931: CallProceeding\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 915 | |
| 916 | if (callproc->options & eCallProceeding_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 917 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 918 | &callproc->h245Address); |
| 919 | if (ret < 0) |
| 920 | return -1; |
| 921 | } |
| 922 | |
| 923 | if (callproc->options & eCallProceeding_UUIE_fastStart) { |
| 924 | for (i = 0; i < callproc->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 925 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 926 | &callproc->fastStart.item[i]); |
| 927 | if (ret < 0) |
| 928 | return -1; |
| 929 | } |
| 930 | } |
| 931 | |
| 932 | return 0; |
| 933 | } |
| 934 | |
| 935 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 936 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 937 | enum ip_conntrack_info ctinfo, |
| 938 | unsigned char **data, int dataoff, |
| 939 | Connect_UUIE *connect) |
| 940 | { |
| 941 | int ret; |
| 942 | int i; |
| 943 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 944 | pr_debug("nf_ct_q931: Connect\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 945 | |
| 946 | if (connect->options & eConnect_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 947 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 948 | &connect->h245Address); |
| 949 | if (ret < 0) |
| 950 | return -1; |
| 951 | } |
| 952 | |
| 953 | if (connect->options & eConnect_UUIE_fastStart) { |
| 954 | for (i = 0; i < connect->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 955 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 956 | &connect->fastStart.item[i]); |
| 957 | if (ret < 0) |
| 958 | return -1; |
| 959 | } |
| 960 | } |
| 961 | |
| 962 | return 0; |
| 963 | } |
| 964 | |
| 965 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 966 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 967 | enum ip_conntrack_info ctinfo, |
| 968 | unsigned char **data, int dataoff, |
| 969 | Alerting_UUIE *alert) |
| 970 | { |
| 971 | int ret; |
| 972 | int i; |
| 973 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 974 | pr_debug("nf_ct_q931: Alerting\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 975 | |
| 976 | if (alert->options & eAlerting_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 977 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 978 | &alert->h245Address); |
| 979 | if (ret < 0) |
| 980 | return -1; |
| 981 | } |
| 982 | |
| 983 | if (alert->options & eAlerting_UUIE_fastStart) { |
| 984 | for (i = 0; i < alert->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 985 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 986 | &alert->fastStart.item[i]); |
| 987 | if (ret < 0) |
| 988 | return -1; |
| 989 | } |
| 990 | } |
| 991 | |
| 992 | return 0; |
| 993 | } |
| 994 | |
| 995 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 996 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 997 | enum ip_conntrack_info ctinfo, |
| 998 | unsigned char **data, int dataoff, |
| 999 | Facility_UUIE *facility) |
| 1000 | { |
| 1001 | int ret; |
| 1002 | int i; |
| 1003 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1004 | pr_debug("nf_ct_q931: Facility\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1005 | |
| 1006 | if (facility->reason.choice == eFacilityReason_callForwarded) { |
| 1007 | if (facility->options & eFacility_UUIE_alternativeAddress) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1008 | return expect_callforwarding(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1009 | dataoff, |
| 1010 | &facility-> |
| 1011 | alternativeAddress); |
| 1012 | return 0; |
| 1013 | } |
| 1014 | |
| 1015 | if (facility->options & eFacility_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1016 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1017 | &facility->h245Address); |
| 1018 | if (ret < 0) |
| 1019 | return -1; |
| 1020 | } |
| 1021 | |
| 1022 | if (facility->options & eFacility_UUIE_fastStart) { |
| 1023 | for (i = 0; i < facility->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1024 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1025 | &facility->fastStart.item[i]); |
| 1026 | if (ret < 0) |
| 1027 | return -1; |
| 1028 | } |
| 1029 | } |
| 1030 | |
| 1031 | return 0; |
| 1032 | } |
| 1033 | |
| 1034 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1035 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1036 | enum ip_conntrack_info ctinfo, |
| 1037 | unsigned char **data, int dataoff, |
| 1038 | Progress_UUIE *progress) |
| 1039 | { |
| 1040 | int ret; |
| 1041 | int i; |
| 1042 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1043 | pr_debug("nf_ct_q931: Progress\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1044 | |
| 1045 | if (progress->options & eProgress_UUIE_h245Address) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1046 | ret = expect_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1047 | &progress->h245Address); |
| 1048 | if (ret < 0) |
| 1049 | return -1; |
| 1050 | } |
| 1051 | |
| 1052 | if (progress->options & eProgress_UUIE_fastStart) { |
| 1053 | for (i = 0; i < progress->fastStart.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1054 | ret = process_olc(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1055 | &progress->fastStart.item[i]); |
| 1056 | if (ret < 0) |
| 1057 | return -1; |
| 1058 | } |
| 1059 | } |
| 1060 | |
| 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1065 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1066 | enum ip_conntrack_info ctinfo, |
| 1067 | unsigned char **data, int dataoff, Q931 *q931) |
| 1068 | { |
| 1069 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; |
| 1070 | int i; |
| 1071 | int ret = 0; |
| 1072 | |
| 1073 | switch (pdu->h323_message_body.choice) { |
| 1074 | case eH323_UU_PDU_h323_message_body_setup: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1075 | ret = process_setup(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1076 | &pdu->h323_message_body.setup); |
| 1077 | break; |
| 1078 | case eH323_UU_PDU_h323_message_body_callProceeding: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1079 | ret = process_callproceeding(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1080 | &pdu->h323_message_body. |
| 1081 | callProceeding); |
| 1082 | break; |
| 1083 | case eH323_UU_PDU_h323_message_body_connect: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1084 | ret = process_connect(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1085 | &pdu->h323_message_body.connect); |
| 1086 | break; |
| 1087 | case eH323_UU_PDU_h323_message_body_alerting: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1088 | ret = process_alerting(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1089 | &pdu->h323_message_body.alerting); |
| 1090 | break; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1091 | case eH323_UU_PDU_h323_message_body_facility: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1092 | ret = process_facility(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1093 | &pdu->h323_message_body.facility); |
| 1094 | break; |
| 1095 | case eH323_UU_PDU_h323_message_body_progress: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1096 | ret = process_progress(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1097 | &pdu->h323_message_body.progress); |
| 1098 | break; |
| 1099 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1100 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
| 1101 | pdu->h323_message_body.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1102 | break; |
| 1103 | } |
| 1104 | |
| 1105 | if (ret < 0) |
| 1106 | return -1; |
| 1107 | |
| 1108 | if (pdu->options & eH323_UU_PDU_h245Control) { |
| 1109 | for (i = 0; i < pdu->h245Control.count; i++) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1110 | ret = process_h245(skb, ct, ctinfo, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1111 | &pdu->h245Control.item[i]); |
| 1112 | if (ret < 0) |
| 1113 | return -1; |
| 1114 | } |
| 1115 | } |
| 1116 | |
| 1117 | return 0; |
| 1118 | } |
| 1119 | |
| 1120 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1121 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1122 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1123 | { |
| 1124 | static Q931 q931; |
| 1125 | unsigned char *data = NULL; |
| 1126 | int datalen; |
| 1127 | int dataoff; |
| 1128 | int ret; |
| 1129 | |
| 1130 | /* Until there's been traffic both ways, don't look in packets. */ |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1131 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1132 | return NF_ACCEPT; |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1133 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1134 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1135 | |
| 1136 | spin_lock_bh(&nf_h323_lock); |
| 1137 | |
| 1138 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1139 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1140 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1141 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1142 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1143 | |
| 1144 | /* Decode Q.931 signal */ |
| 1145 | ret = DecodeQ931(data, datalen, &q931); |
| 1146 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1147 | pr_debug("nf_ct_q931: decoding error: %s\n", |
| 1148 | ret == H323_ERROR_BOUND ? |
| 1149 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1150 | /* We don't drop when decoding error */ |
| 1151 | break; |
| 1152 | } |
| 1153 | |
| 1154 | /* Process Q.931 signal */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1155 | if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1156 | goto drop; |
| 1157 | } |
| 1158 | |
| 1159 | spin_unlock_bh(&nf_h323_lock); |
| 1160 | return NF_ACCEPT; |
| 1161 | |
| 1162 | drop: |
| 1163 | spin_unlock_bh(&nf_h323_lock); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1164 | net_info_ratelimited("nf_ct_q931: packet dropped\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1165 | return NF_DROP; |
| 1166 | } |
| 1167 | |
| 1168 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1169 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
| 1170 | /* T.120 and H.245 */ |
| 1171 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, |
| 1172 | .timeout = 240, |
| 1173 | }; |
| 1174 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1175 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
| 1176 | { |
| 1177 | .name = "Q.931", |
| 1178 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1179 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1180 | .tuple.src.l3num = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1181 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1182 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1183 | .help = q931_help, |
| 1184 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1185 | }, |
| 1186 | { |
| 1187 | .name = "Q.931", |
| 1188 | .me = THIS_MODULE, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1189 | .tuple.src.l3num = AF_INET6, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1190 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1191 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1192 | .help = q931_help, |
| 1193 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1194 | }, |
| 1195 | }; |
| 1196 | |
| 1197 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1198 | 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] | 1199 | int *datalen) |
| 1200 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 1201 | const struct udphdr *uh; |
| 1202 | struct udphdr _uh; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1203 | int dataoff; |
| 1204 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1205 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1206 | if (uh == NULL) |
| 1207 | return NULL; |
| 1208 | dataoff = protoff + sizeof(_uh); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1209 | if (dataoff >= skb->len) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1210 | return NULL; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1211 | *datalen = skb->len - dataoff; |
| 1212 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1213 | } |
| 1214 | |
| 1215 | /****************************************************************************/ |
| 1216 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1217 | union nf_inet_addr *addr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1218 | __be16 port) |
| 1219 | { |
Alexey Dobriyan | 84541cc | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1220 | struct net *net = nf_ct_net(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1221 | struct nf_conntrack_expect *exp; |
| 1222 | struct nf_conntrack_tuple tuple; |
| 1223 | |
| 1224 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); |
| 1225 | tuple.src.u.tcp.port = 0; |
| 1226 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); |
| 1227 | tuple.dst.u.tcp.port = port; |
| 1228 | tuple.dst.protonum = IPPROTO_TCP; |
| 1229 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1230 | exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1231 | if (exp && exp->master == ct) |
| 1232 | return exp; |
| 1233 | return NULL; |
| 1234 | } |
| 1235 | |
| 1236 | /****************************************************************************/ |
| 1237 | static int set_expect_timeout(struct nf_conntrack_expect *exp, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1238 | unsigned int timeout) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1239 | { |
| 1240 | if (!exp || !del_timer(&exp->timeout)) |
| 1241 | return 0; |
| 1242 | |
| 1243 | exp->timeout.expires = jiffies + timeout * HZ; |
| 1244 | add_timer(&exp->timeout); |
| 1245 | |
| 1246 | return 1; |
| 1247 | } |
| 1248 | |
| 1249 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1250 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1251 | enum ip_conntrack_info ctinfo, |
| 1252 | unsigned char **data, |
| 1253 | TransportAddress *taddr, int count) |
| 1254 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1255 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1256 | int dir = CTINFO2DIR(ctinfo); |
| 1257 | int ret = 0; |
| 1258 | int i; |
| 1259 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1260 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1261 | struct nf_conntrack_expect *exp; |
| 1262 | typeof(nat_q931_hook) nat_q931; |
| 1263 | |
| 1264 | /* Look for the first related address */ |
| 1265 | for (i = 0; i < count; i++) { |
| 1266 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && |
| 1267 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1268 | sizeof(addr)) == 0 && port != 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1269 | break; |
| 1270 | } |
| 1271 | |
| 1272 | if (i >= count) /* Not found */ |
| 1273 | return 0; |
| 1274 | |
| 1275 | /* Create expect for Q.931 */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1276 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1277 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1278 | 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] | 1279 | gkrouted_only ? /* only accept calls from GK? */ |
| 1280 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, |
| 1281 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1282 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1283 | exp->helper = nf_conntrack_helper_q931; |
| 1284 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ |
| 1285 | |
| 1286 | nat_q931 = rcu_dereference(nat_q931_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1287 | if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1288 | ct->status & IPS_NAT_MASK) { /* Need NAT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1289 | ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1290 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1291 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1292 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1293 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1294 | |
| 1295 | /* Save port for looking up expect in processing RCF */ |
| 1296 | info->sig_port[dir] = port; |
| 1297 | } else |
| 1298 | ret = -1; |
| 1299 | } |
| 1300 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1301 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1302 | |
| 1303 | return ret; |
| 1304 | } |
| 1305 | |
| 1306 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1307 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1308 | enum ip_conntrack_info ctinfo, |
| 1309 | unsigned char **data, GatekeeperRequest *grq) |
| 1310 | { |
| 1311 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1312 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1313 | pr_debug("nf_ct_ras: GRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1314 | |
| 1315 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1316 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1317 | ct->status & IPS_NAT_MASK) /* NATed */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1318 | return set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1319 | &grq->rasAddress, 1); |
| 1320 | return 0; |
| 1321 | } |
| 1322 | |
| 1323 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1324 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1325 | enum ip_conntrack_info ctinfo, |
| 1326 | unsigned char **data, GatekeeperConfirm *gcf) |
| 1327 | { |
| 1328 | int dir = CTINFO2DIR(ctinfo); |
| 1329 | int ret = 0; |
| 1330 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1331 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1332 | struct nf_conntrack_expect *exp; |
| 1333 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1334 | pr_debug("nf_ct_ras: GCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1335 | |
| 1336 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) |
| 1337 | return 0; |
| 1338 | |
| 1339 | /* Registration port is the same as discovery port */ |
| 1340 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1341 | port == ct->tuplehash[dir].tuple.src.u.udp.port) |
| 1342 | return 0; |
| 1343 | |
| 1344 | /* Avoid RAS expectation loops. A GCF is never expected. */ |
| 1345 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
| 1346 | return 0; |
| 1347 | |
| 1348 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1349 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1350 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1351 | 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] | 1352 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1353 | IPPROTO_UDP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1354 | exp->helper = nf_conntrack_helper_ras; |
| 1355 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1356 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1357 | pr_debug("nf_ct_ras: expect RAS "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1358 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1359 | } else |
| 1360 | ret = -1; |
| 1361 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1362 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1363 | |
| 1364 | return ret; |
| 1365 | } |
| 1366 | |
| 1367 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1368 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1369 | enum ip_conntrack_info ctinfo, |
| 1370 | unsigned char **data, RegistrationRequest *rrq) |
| 1371 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1372 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1373 | int ret; |
| 1374 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1375 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1376 | pr_debug("nf_ct_ras: RRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1377 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1378 | ret = expect_q931(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1379 | rrq->callSignalAddress.item, |
| 1380 | rrq->callSignalAddress.count); |
| 1381 | if (ret < 0) |
| 1382 | return -1; |
| 1383 | |
| 1384 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1385 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1386 | ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1387 | ret = set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1388 | rrq->rasAddress.item, |
| 1389 | rrq->rasAddress.count); |
| 1390 | if (ret < 0) |
| 1391 | return -1; |
| 1392 | } |
| 1393 | |
| 1394 | if (rrq->options & eRegistrationRequest_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1395 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1396 | info->timeout = rrq->timeToLive; |
| 1397 | } else |
| 1398 | info->timeout = default_rrq_ttl; |
| 1399 | |
| 1400 | return 0; |
| 1401 | } |
| 1402 | |
| 1403 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1404 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1405 | enum ip_conntrack_info ctinfo, |
| 1406 | unsigned char **data, RegistrationConfirm *rcf) |
| 1407 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1408 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1409 | int dir = CTINFO2DIR(ctinfo); |
| 1410 | int ret; |
| 1411 | struct nf_conntrack_expect *exp; |
| 1412 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1413 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1414 | pr_debug("nf_ct_ras: RCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1415 | |
| 1416 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1417 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1418 | ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1419 | ret = set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1420 | rcf->callSignalAddress.item, |
| 1421 | rcf->callSignalAddress.count); |
| 1422 | if (ret < 0) |
| 1423 | return -1; |
| 1424 | } |
| 1425 | |
| 1426 | if (rcf->options & eRegistrationConfirm_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1427 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1428 | info->timeout = rcf->timeToLive; |
| 1429 | } |
| 1430 | |
| 1431 | if (info->timeout > 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1432 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
| 1433 | "%u seconds\n", info->timeout); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1434 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1435 | |
| 1436 | /* Set expect timeout */ |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1437 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1438 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
| 1439 | info->sig_port[!dir]); |
| 1440 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1441 | pr_debug("nf_ct_ras: set Q.931 expect " |
| 1442 | "timeout to %u seconds for", |
| 1443 | info->timeout); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1444 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1445 | set_expect_timeout(exp, info->timeout); |
| 1446 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1447 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1448 | } |
| 1449 | |
| 1450 | return 0; |
| 1451 | } |
| 1452 | |
| 1453 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1454 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1455 | enum ip_conntrack_info ctinfo, |
| 1456 | unsigned char **data, UnregistrationRequest *urq) |
| 1457 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1458 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1459 | int dir = CTINFO2DIR(ctinfo); |
| 1460 | int ret; |
| 1461 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1462 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1463 | pr_debug("nf_ct_ras: URQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1464 | |
| 1465 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1466 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1467 | ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1468 | ret = set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1469 | urq->callSignalAddress.item, |
| 1470 | urq->callSignalAddress.count); |
| 1471 | if (ret < 0) |
| 1472 | return -1; |
| 1473 | } |
| 1474 | |
| 1475 | /* Clear old expect */ |
| 1476 | nf_ct_remove_expectations(ct); |
| 1477 | info->sig_port[dir] = 0; |
| 1478 | info->sig_port[!dir] = 0; |
| 1479 | |
| 1480 | /* Give it 30 seconds for UCF or URJ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1481 | nf_ct_refresh(ct, skb, 30 * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1482 | |
| 1483 | return 0; |
| 1484 | } |
| 1485 | |
| 1486 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1487 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1488 | enum ip_conntrack_info ctinfo, |
| 1489 | unsigned char **data, AdmissionRequest *arq) |
| 1490 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1491 | const struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1492 | int dir = CTINFO2DIR(ctinfo); |
| 1493 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1494 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1495 | typeof(set_h225_addr_hook) set_h225_addr; |
| 1496 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1497 | pr_debug("nf_ct_ras: ARQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1498 | |
| 1499 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 1500 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && |
| 1501 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1502 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1503 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1504 | port == info->sig_port[dir] && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1505 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1506 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
| 1507 | /* Answering 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->destCallSignalAddress, |
| 1510 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1511 | info->sig_port[!dir]); |
| 1512 | } |
| 1513 | |
| 1514 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && |
| 1515 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1516 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1517 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1518 | set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1519 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1520 | /* Calling ARQ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1521 | return set_h225_addr(skb, data, 0, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1522 | &arq->srcCallSignalAddress, |
| 1523 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1524 | port); |
| 1525 | } |
| 1526 | |
| 1527 | return 0; |
| 1528 | } |
| 1529 | |
| 1530 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1531 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1532 | enum ip_conntrack_info ctinfo, |
| 1533 | unsigned char **data, AdmissionConfirm *acf) |
| 1534 | { |
| 1535 | int dir = CTINFO2DIR(ctinfo); |
| 1536 | int ret = 0; |
| 1537 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1538 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1539 | struct nf_conntrack_expect *exp; |
| 1540 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1541 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1542 | pr_debug("nf_ct_ras: ACF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1543 | |
| 1544 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, |
| 1545 | &addr, &port)) |
| 1546 | return 0; |
| 1547 | |
| 1548 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { |
| 1549 | /* Answering ACF */ |
| 1550 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1551 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1552 | ct->status & IPS_NAT_MASK) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1553 | return set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1554 | &acf->destCallSignalAddress, 1); |
| 1555 | return 0; |
| 1556 | } |
| 1557 | |
| 1558 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1559 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1560 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1561 | 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] | 1562 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1563 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1564 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1565 | exp->helper = nf_conntrack_helper_q931; |
| 1566 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1567 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1568 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1569 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1570 | } else |
| 1571 | ret = -1; |
| 1572 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1573 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1574 | |
| 1575 | return ret; |
| 1576 | } |
| 1577 | |
| 1578 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1579 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1580 | enum ip_conntrack_info ctinfo, |
| 1581 | unsigned char **data, LocationRequest *lrq) |
| 1582 | { |
| 1583 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1584 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1585 | pr_debug("nf_ct_ras: LRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1586 | |
| 1587 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1588 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1589 | ct->status & IPS_NAT_MASK) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1590 | return set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1591 | &lrq->replyAddress, 1); |
| 1592 | return 0; |
| 1593 | } |
| 1594 | |
| 1595 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1596 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1597 | enum ip_conntrack_info ctinfo, |
| 1598 | unsigned char **data, LocationConfirm *lcf) |
| 1599 | { |
| 1600 | int dir = CTINFO2DIR(ctinfo); |
| 1601 | int ret = 0; |
| 1602 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1603 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1604 | struct nf_conntrack_expect *exp; |
| 1605 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1606 | pr_debug("nf_ct_ras: LCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1607 | |
| 1608 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, |
| 1609 | &addr, &port)) |
| 1610 | return 0; |
| 1611 | |
| 1612 | /* Need new expect for call signal */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1613 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1614 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1615 | 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] | 1616 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1617 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1618 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1619 | exp->helper = nf_conntrack_helper_q931; |
| 1620 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1621 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1622 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1623 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1624 | } else |
| 1625 | ret = -1; |
| 1626 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1627 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1628 | |
| 1629 | /* Ignore rasAddress */ |
| 1630 | |
| 1631 | return ret; |
| 1632 | } |
| 1633 | |
| 1634 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1635 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1636 | enum ip_conntrack_info ctinfo, |
| 1637 | unsigned char **data, InfoRequestResponse *irr) |
| 1638 | { |
| 1639 | int ret; |
| 1640 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1641 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1642 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1643 | pr_debug("nf_ct_ras: IRR\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1644 | |
| 1645 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1646 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1647 | ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1648 | ret = set_ras_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1649 | &irr->rasAddress, 1); |
| 1650 | if (ret < 0) |
| 1651 | return -1; |
| 1652 | } |
| 1653 | |
| 1654 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame^] | 1655 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1656 | ct->status & IPS_NAT_MASK) { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1657 | ret = set_sig_addr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1658 | irr->callSignalAddress.item, |
| 1659 | irr->callSignalAddress.count); |
| 1660 | if (ret < 0) |
| 1661 | return -1; |
| 1662 | } |
| 1663 | |
| 1664 | return 0; |
| 1665 | } |
| 1666 | |
| 1667 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1668 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1669 | enum ip_conntrack_info ctinfo, |
| 1670 | unsigned char **data, RasMessage *ras) |
| 1671 | { |
| 1672 | switch (ras->choice) { |
| 1673 | case eRasMessage_gatekeeperRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1674 | return process_grq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1675 | &ras->gatekeeperRequest); |
| 1676 | case eRasMessage_gatekeeperConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1677 | return process_gcf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1678 | &ras->gatekeeperConfirm); |
| 1679 | case eRasMessage_registrationRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1680 | return process_rrq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1681 | &ras->registrationRequest); |
| 1682 | case eRasMessage_registrationConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1683 | return process_rcf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1684 | &ras->registrationConfirm); |
| 1685 | case eRasMessage_unregistrationRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1686 | return process_urq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1687 | &ras->unregistrationRequest); |
| 1688 | case eRasMessage_admissionRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1689 | return process_arq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1690 | &ras->admissionRequest); |
| 1691 | case eRasMessage_admissionConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1692 | return process_acf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1693 | &ras->admissionConfirm); |
| 1694 | case eRasMessage_locationRequest: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1695 | return process_lrq(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1696 | &ras->locationRequest); |
| 1697 | case eRasMessage_locationConfirm: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1698 | return process_lcf(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1699 | &ras->locationConfirm); |
| 1700 | case eRasMessage_infoRequestResponse: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1701 | return process_irr(skb, ct, ctinfo, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1702 | &ras->infoRequestResponse); |
| 1703 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1704 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1705 | break; |
| 1706 | } |
| 1707 | |
| 1708 | return 0; |
| 1709 | } |
| 1710 | |
| 1711 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1712 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1713 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1714 | { |
| 1715 | static RasMessage ras; |
| 1716 | unsigned char *data; |
| 1717 | int datalen = 0; |
| 1718 | int ret; |
| 1719 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1720 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1721 | |
| 1722 | spin_lock_bh(&nf_h323_lock); |
| 1723 | |
| 1724 | /* Get UDP data */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1725 | data = get_udp_data(skb, protoff, &datalen); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1726 | if (data == NULL) |
| 1727 | goto accept; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1728 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1729 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1730 | |
| 1731 | /* Decode RAS message */ |
| 1732 | ret = DecodeRasMessage(data, datalen, &ras); |
| 1733 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1734 | pr_debug("nf_ct_ras: decoding error: %s\n", |
| 1735 | ret == H323_ERROR_BOUND ? |
| 1736 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1737 | goto accept; |
| 1738 | } |
| 1739 | |
| 1740 | /* Process RAS message */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1741 | if (process_ras(skb, ct, ctinfo, &data, &ras) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1742 | goto drop; |
| 1743 | |
| 1744 | accept: |
| 1745 | spin_unlock_bh(&nf_h323_lock); |
| 1746 | return NF_ACCEPT; |
| 1747 | |
| 1748 | drop: |
| 1749 | spin_unlock_bh(&nf_h323_lock); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1750 | net_info_ratelimited("nf_ct_ras: packet dropped\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1751 | return NF_DROP; |
| 1752 | } |
| 1753 | |
| 1754 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1755 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
| 1756 | .max_expected = 32, |
| 1757 | .timeout = 240, |
| 1758 | }; |
| 1759 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1760 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
| 1761 | { |
| 1762 | .name = "RAS", |
| 1763 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1764 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1765 | .tuple.src.l3num = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1766 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1767 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1768 | .help = ras_help, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1769 | .expect_policy = &ras_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1770 | }, |
| 1771 | { |
| 1772 | .name = "RAS", |
| 1773 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1774 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1775 | .tuple.src.l3num = AF_INET6, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1776 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1777 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1778 | .help = ras_help, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1779 | .expect_policy = &ras_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1780 | }, |
| 1781 | }; |
| 1782 | |
| 1783 | /****************************************************************************/ |
| 1784 | static void __exit nf_conntrack_h323_fini(void) |
| 1785 | { |
| 1786 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); |
| 1787 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
| 1788 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
| 1789 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1790 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1791 | kfree(h323_buffer); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1792 | pr_debug("nf_ct_h323: fini\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1793 | } |
| 1794 | |
| 1795 | /****************************************************************************/ |
| 1796 | static int __init nf_conntrack_h323_init(void) |
| 1797 | { |
| 1798 | int ret; |
| 1799 | |
| 1800 | h323_buffer = kmalloc(65536, GFP_KERNEL); |
| 1801 | if (!h323_buffer) |
| 1802 | return -ENOMEM; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1803 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1804 | if (ret < 0) |
| 1805 | goto err1; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1806 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1807 | if (ret < 0) |
| 1808 | goto err2; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1809 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1810 | if (ret < 0) |
| 1811 | goto err3; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1812 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1813 | if (ret < 0) |
| 1814 | goto err4; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1815 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); |
| 1816 | if (ret < 0) |
| 1817 | goto err5; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1818 | pr_debug("nf_ct_h323: init success\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1819 | return 0; |
| 1820 | |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1821 | err5: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1822 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1823 | err4: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1824 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1825 | err3: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1826 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1827 | err2: |
| 1828 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1829 | err1: |
Patrick McHardy | 8a54886 | 2008-06-17 15:52:07 -0700 | [diff] [blame] | 1830 | kfree(h323_buffer); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1831 | return ret; |
| 1832 | } |
| 1833 | |
| 1834 | /****************************************************************************/ |
| 1835 | module_init(nf_conntrack_h323_init); |
| 1836 | module_exit(nf_conntrack_h323_fini); |
| 1837 | |
| 1838 | EXPORT_SYMBOL_GPL(get_h225_addr); |
| 1839 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); |
| 1840 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); |
| 1841 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); |
| 1842 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); |
| 1843 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); |
| 1844 | EXPORT_SYMBOL_GPL(nat_t120_hook); |
| 1845 | EXPORT_SYMBOL_GPL(nat_h245_hook); |
| 1846 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); |
| 1847 | EXPORT_SYMBOL_GPL(nat_q931_hook); |
| 1848 | |
| 1849 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); |
| 1850 | MODULE_DESCRIPTION("H.323 connection tracking helper"); |
| 1851 | MODULE_LICENSE("GPL"); |
| 1852 | MODULE_ALIAS("ip_conntrack_h323"); |
Pablo Neira Ayuso | be3eed2 | 2012-05-14 00:42:02 +0200 | [diff] [blame] | 1853 | MODULE_ALIAS_NFCT_HELPER("RAS"); |
| 1854 | MODULE_ALIAS_NFCT_HELPER("Q.931"); |
| 1855 | MODULE_ALIAS_NFCT_HELPER("H.245"); |