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 */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 52 | int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff, |
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; |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 57 | int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff, |
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, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 65 | unsigned int protoff, unsigned char **data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 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, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 70 | unsigned int protoff, unsigned char **data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 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, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 75 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 76 | unsigned char **data, int dataoff, |
| 77 | H245_TransportAddress *taddr, |
| 78 | __be16 port, __be16 rtp_port, |
| 79 | struct nf_conntrack_expect *rtp_exp, |
| 80 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 81 | int (*nat_t120_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 82 | struct nf_conn *ct, |
| 83 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 84 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 85 | unsigned char **data, int dataoff, |
| 86 | H245_TransportAddress *taddr, __be16 port, |
| 87 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 88 | int (*nat_h245_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 89 | struct nf_conn *ct, |
| 90 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 91 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 92 | unsigned char **data, int dataoff, |
| 93 | TransportAddress *taddr, __be16 port, |
| 94 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 95 | int (*nat_callforwarding_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 96 | struct nf_conn *ct, |
| 97 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 98 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 99 | unsigned char **data, int dataoff, |
| 100 | TransportAddress *taddr, __be16 port, |
| 101 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 102 | int (*nat_q931_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 103 | struct nf_conn *ct, |
| 104 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 105 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 106 | unsigned char **data, TransportAddress *taddr, int idx, |
| 107 | __be16 port, struct nf_conntrack_expect *exp) |
| 108 | __read_mostly; |
| 109 | |
| 110 | static DEFINE_SPINLOCK(nf_h323_lock); |
| 111 | static char *h323_buffer; |
| 112 | |
| 113 | static struct nf_conntrack_helper nf_conntrack_helper_h245; |
| 114 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; |
| 115 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; |
| 116 | |
| 117 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 118 | static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 119 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
| 120 | unsigned char **data, int *datalen, int *dataoff) |
| 121 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 122 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 123 | int dir = CTINFO2DIR(ctinfo); |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 124 | const struct tcphdr *th; |
| 125 | struct tcphdr _tcph; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 126 | int tcpdatalen; |
| 127 | int tcpdataoff; |
| 128 | unsigned char *tpkt; |
| 129 | int tpktlen; |
| 130 | int tpktoff; |
| 131 | |
| 132 | /* Get TCP header */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 133 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 134 | if (th == NULL) |
| 135 | return 0; |
| 136 | |
| 137 | /* Get TCP data offset */ |
| 138 | tcpdataoff = protoff + th->doff * 4; |
| 139 | |
| 140 | /* Get TCP data length */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 141 | tcpdatalen = skb->len - tcpdataoff; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 142 | if (tcpdatalen <= 0) /* No TCP data */ |
| 143 | goto clear_out; |
| 144 | |
| 145 | if (*data == NULL) { /* first TPKT */ |
| 146 | /* Get first TPKT pointer */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 147 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 148 | h323_buffer); |
| 149 | BUG_ON(tpkt == NULL); |
| 150 | |
| 151 | /* Validate TPKT identifier */ |
| 152 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { |
| 153 | /* Netmeeting sends TPKT header and data separately */ |
| 154 | if (info->tpkt_len[dir] > 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 155 | pr_debug("nf_ct_h323: previous packet " |
| 156 | "indicated separate TPKT data of %hu " |
| 157 | "bytes\n", info->tpkt_len[dir]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 158 | if (info->tpkt_len[dir] <= tcpdatalen) { |
| 159 | /* Yes, there was a TPKT header |
| 160 | * received */ |
| 161 | *data = tpkt; |
| 162 | *datalen = info->tpkt_len[dir]; |
| 163 | *dataoff = 0; |
| 164 | goto out; |
| 165 | } |
| 166 | |
| 167 | /* Fragmented TPKT */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 168 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 169 | goto clear_out; |
| 170 | } |
| 171 | |
| 172 | /* It is not even a TPKT */ |
| 173 | return 0; |
| 174 | } |
| 175 | tpktoff = 0; |
| 176 | } else { /* Next TPKT */ |
| 177 | tpktoff = *dataoff + *datalen; |
| 178 | tcpdatalen -= tpktoff; |
| 179 | if (tcpdatalen <= 4) /* No more TPKT */ |
| 180 | goto clear_out; |
| 181 | tpkt = *data + *datalen; |
| 182 | |
| 183 | /* Validate TPKT identifier */ |
| 184 | if (tpkt[0] != 0x03 || tpkt[1] != 0) |
| 185 | goto clear_out; |
| 186 | } |
| 187 | |
| 188 | /* Validate TPKT length */ |
| 189 | tpktlen = tpkt[2] * 256 + tpkt[3]; |
| 190 | if (tpktlen < 4) |
| 191 | goto clear_out; |
| 192 | if (tpktlen > tcpdatalen) { |
| 193 | if (tcpdatalen == 4) { /* Separate TPKT header */ |
| 194 | /* Netmeeting sends TPKT header and data separately */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 195 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
| 196 | "there will be TPKT data of %hu bytes\n", |
| 197 | tpktlen - 4); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 198 | info->tpkt_len[dir] = tpktlen - 4; |
| 199 | return 0; |
| 200 | } |
| 201 | |
Patrick McHardy | e772c34 | 2010-05-01 18:29:43 +0200 | [diff] [blame] | 202 | pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 203 | goto clear_out; |
| 204 | } |
| 205 | |
| 206 | /* This is the encapsulated data */ |
| 207 | *data = tpkt + 4; |
| 208 | *datalen = tpktlen - 4; |
| 209 | *dataoff = tpktoff + 4; |
| 210 | |
| 211 | out: |
| 212 | /* Clear TPKT length */ |
| 213 | info->tpkt_len[dir] = 0; |
| 214 | return 1; |
| 215 | |
| 216 | clear_out: |
| 217 | info->tpkt_len[dir] = 0; |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | /****************************************************************************/ |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 222 | 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] | 223 | H245_TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 224 | union nf_inet_addr *addr, __be16 *port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 225 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 226 | const unsigned char *p; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 227 | int len; |
| 228 | |
| 229 | if (taddr->choice != eH245_TransportAddress_unicastAddress) |
| 230 | return 0; |
| 231 | |
| 232 | switch (taddr->unicastAddress.choice) { |
| 233 | case eUnicastAddress_iPAddress: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 234 | if (nf_ct_l3num(ct) != AF_INET) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 235 | return 0; |
| 236 | p = data + taddr->unicastAddress.iPAddress.network; |
| 237 | len = 4; |
| 238 | break; |
| 239 | case eUnicastAddress_iP6Address: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 240 | if (nf_ct_l3num(ct) != AF_INET6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 241 | return 0; |
| 242 | p = data + taddr->unicastAddress.iP6Address.network; |
| 243 | len = 16; |
| 244 | break; |
| 245 | default: |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | memcpy(addr, p, len); |
| 250 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 251 | memcpy(port, p + len, sizeof(__be16)); |
| 252 | |
| 253 | return 1; |
| 254 | } |
| 255 | |
| 256 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 257 | 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] | 258 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 259 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 260 | unsigned char **data, int dataoff, |
| 261 | H245_TransportAddress *taddr) |
| 262 | { |
| 263 | int dir = CTINFO2DIR(ctinfo); |
| 264 | int ret = 0; |
| 265 | __be16 port; |
| 266 | __be16 rtp_port, rtcp_port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 267 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 268 | struct nf_conntrack_expect *rtp_exp; |
| 269 | struct nf_conntrack_expect *rtcp_exp; |
| 270 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; |
| 271 | |
| 272 | /* Read RTP or RTCP address */ |
| 273 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 274 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 275 | port == 0) |
| 276 | return 0; |
| 277 | |
| 278 | /* RTP port is even */ |
Pablo Neira Ayuso | d109e9a | 2012-06-04 13:31:04 +0200 | [diff] [blame] | 279 | rtp_port = port & ~htons(1); |
| 280 | rtcp_port = port | htons(1); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 281 | |
| 282 | /* Create expect for RTP */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 283 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 284 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 285 | 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] | 286 | &ct->tuplehash[!dir].tuple.src.u3, |
| 287 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 288 | IPPROTO_UDP, NULL, &rtp_port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 289 | |
| 290 | /* Create expect for RTCP */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 291 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
| 292 | nf_ct_expect_put(rtp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 293 | return -1; |
| 294 | } |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 295 | 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] | 296 | &ct->tuplehash[!dir].tuple.src.u3, |
| 297 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 298 | IPPROTO_UDP, NULL, &rtcp_port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 299 | |
| 300 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 301 | &ct->tuplehash[!dir].tuple.dst.u3, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 302 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 303 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 304 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 305 | ct->status & IPS_NAT_MASK) { |
| 306 | /* NAT needed */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 307 | ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 308 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
| 309 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 310 | if (nf_ct_expect_related(rtp_exp) == 0) { |
| 311 | if (nf_ct_expect_related(rtcp_exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 312 | pr_debug("nf_ct_h323: expect RTP "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 313 | nf_ct_dump_tuple(&rtp_exp->tuple); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 314 | pr_debug("nf_ct_h323: expect RTCP "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 315 | nf_ct_dump_tuple(&rtcp_exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 316 | } else { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 317 | nf_ct_unexpect_related(rtp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 318 | ret = -1; |
| 319 | } |
| 320 | } else |
| 321 | ret = -1; |
| 322 | } |
| 323 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 324 | nf_ct_expect_put(rtp_exp); |
| 325 | nf_ct_expect_put(rtcp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 326 | |
| 327 | return ret; |
| 328 | } |
| 329 | |
| 330 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 331 | static int expect_t120(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 332 | struct nf_conn *ct, |
| 333 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 334 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 335 | unsigned char **data, int dataoff, |
| 336 | H245_TransportAddress *taddr) |
| 337 | { |
| 338 | int dir = CTINFO2DIR(ctinfo); |
| 339 | int ret = 0; |
| 340 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 341 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 342 | struct nf_conntrack_expect *exp; |
| 343 | typeof(nat_t120_hook) nat_t120; |
| 344 | |
| 345 | /* Read T.120 address */ |
| 346 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 347 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 348 | port == 0) |
| 349 | return 0; |
| 350 | |
| 351 | /* Create expect for T.120 connections */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 352 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 353 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 354 | 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] | 355 | &ct->tuplehash[!dir].tuple.src.u3, |
| 356 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 357 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 358 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
| 359 | |
| 360 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 361 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 362 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 363 | (nat_t120 = rcu_dereference(nat_t120_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 364 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 365 | ct->status & IPS_NAT_MASK) { |
| 366 | /* NAT needed */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 367 | ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 368 | port, exp); |
| 369 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 370 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 371 | pr_debug("nf_ct_h323: expect T.120 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 372 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 373 | } else |
| 374 | ret = -1; |
| 375 | } |
| 376 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 377 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 378 | |
| 379 | return ret; |
| 380 | } |
| 381 | |
| 382 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 383 | static int process_h245_channel(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 384 | struct nf_conn *ct, |
| 385 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 386 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 387 | unsigned char **data, int dataoff, |
| 388 | H2250LogicalChannelParameters *channel) |
| 389 | { |
| 390 | int ret; |
| 391 | |
| 392 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { |
| 393 | /* RTP */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 394 | ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 395 | &channel->mediaChannel); |
| 396 | if (ret < 0) |
| 397 | return -1; |
| 398 | } |
| 399 | |
| 400 | if (channel-> |
| 401 | options & eH2250LogicalChannelParameters_mediaControlChannel) { |
| 402 | /* RTCP */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 403 | ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 404 | &channel->mediaControlChannel); |
| 405 | if (ret < 0) |
| 406 | return -1; |
| 407 | } |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 413 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 414 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 415 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 416 | unsigned char **data, int dataoff, |
| 417 | OpenLogicalChannel *olc) |
| 418 | { |
| 419 | int ret; |
| 420 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 421 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 422 | |
| 423 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == |
| 424 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) |
| 425 | { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 426 | ret = process_h245_channel(skb, ct, ctinfo, |
| 427 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 428 | &olc-> |
| 429 | forwardLogicalChannelParameters. |
| 430 | multiplexParameters. |
| 431 | h2250LogicalChannelParameters); |
| 432 | if (ret < 0) |
| 433 | return -1; |
| 434 | } |
| 435 | |
| 436 | if ((olc->options & |
| 437 | eOpenLogicalChannel_reverseLogicalChannelParameters) && |
| 438 | (olc->reverseLogicalChannelParameters.options & |
| 439 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) |
| 440 | && (olc->reverseLogicalChannelParameters.multiplexParameters. |
| 441 | choice == |
| 442 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 443 | { |
| 444 | ret = |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 445 | process_h245_channel(skb, ct, ctinfo, |
| 446 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 447 | &olc-> |
| 448 | reverseLogicalChannelParameters. |
| 449 | multiplexParameters. |
| 450 | h2250LogicalChannelParameters); |
| 451 | if (ret < 0) |
| 452 | return -1; |
| 453 | } |
| 454 | |
| 455 | if ((olc->options & eOpenLogicalChannel_separateStack) && |
| 456 | olc->forwardLogicalChannelParameters.dataType.choice == |
| 457 | eDataType_data && |
| 458 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 459 | choice == eDataApplicationCapability_application_t120 && |
| 460 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 461 | t120.choice == eDataProtocolCapability_separateLANStack && |
| 462 | olc->separateStack.networkAddress.choice == |
| 463 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 464 | ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 465 | &olc->separateStack.networkAddress. |
| 466 | localAreaAddress); |
| 467 | if (ret < 0) |
| 468 | return -1; |
| 469 | } |
| 470 | |
| 471 | return 0; |
| 472 | } |
| 473 | |
| 474 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 475 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 476 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 477 | unsigned int protoff, unsigned char **data, int dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 478 | OpenLogicalChannelAck *olca) |
| 479 | { |
| 480 | H2250LogicalChannelAckParameters *ack; |
| 481 | int ret; |
| 482 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 483 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 484 | |
| 485 | if ((olca->options & |
| 486 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && |
| 487 | (olca->reverseLogicalChannelParameters.options & |
| 488 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) |
| 489 | && (olca->reverseLogicalChannelParameters.multiplexParameters. |
| 490 | choice == |
| 491 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 492 | { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 493 | ret = process_h245_channel(skb, ct, ctinfo, |
| 494 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 495 | &olca-> |
| 496 | reverseLogicalChannelParameters. |
| 497 | multiplexParameters. |
| 498 | h2250LogicalChannelParameters); |
| 499 | if (ret < 0) |
| 500 | return -1; |
| 501 | } |
| 502 | |
| 503 | if ((olca->options & |
| 504 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && |
| 505 | (olca->forwardMultiplexAckParameters.choice == |
| 506 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) |
| 507 | { |
| 508 | ack = &olca->forwardMultiplexAckParameters. |
| 509 | h2250LogicalChannelAckParameters; |
| 510 | if (ack->options & |
| 511 | eH2250LogicalChannelAckParameters_mediaChannel) { |
| 512 | /* RTP */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 513 | ret = expect_rtp_rtcp(skb, ct, ctinfo, |
| 514 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 515 | &ack->mediaChannel); |
| 516 | if (ret < 0) |
| 517 | return -1; |
| 518 | } |
| 519 | |
| 520 | if (ack->options & |
| 521 | eH2250LogicalChannelAckParameters_mediaControlChannel) { |
| 522 | /* RTCP */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 523 | ret = expect_rtp_rtcp(skb, ct, ctinfo, |
| 524 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 525 | &ack->mediaControlChannel); |
| 526 | if (ret < 0) |
| 527 | return -1; |
| 528 | } |
| 529 | } |
| 530 | |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 531 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
| 532 | olca->separateStack.networkAddress.choice == |
| 533 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 534 | ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 535 | &olca->separateStack.networkAddress. |
| 536 | localAreaAddress); |
| 537 | if (ret < 0) |
| 538 | return -1; |
| 539 | } |
| 540 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 545 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 546 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 547 | unsigned int protoff, unsigned char **data, int dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 548 | MultimediaSystemControlMessage *mscm) |
| 549 | { |
| 550 | switch (mscm->choice) { |
| 551 | case eMultimediaSystemControlMessage_request: |
| 552 | if (mscm->request.choice == |
| 553 | eRequestMessage_openLogicalChannel) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 554 | return process_olc(skb, ct, ctinfo, |
| 555 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 556 | &mscm->request.openLogicalChannel); |
| 557 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 558 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
| 559 | mscm->request.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 560 | break; |
| 561 | case eMultimediaSystemControlMessage_response: |
| 562 | if (mscm->response.choice == |
| 563 | eResponseMessage_openLogicalChannelAck) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 564 | return process_olca(skb, ct, ctinfo, |
| 565 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 566 | &mscm->response. |
| 567 | openLogicalChannelAck); |
| 568 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 569 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
| 570 | mscm->response.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 571 | break; |
| 572 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 573 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 574 | break; |
| 575 | } |
| 576 | |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 581 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 582 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 583 | { |
| 584 | static MultimediaSystemControlMessage mscm; |
| 585 | unsigned char *data = NULL; |
| 586 | int datalen; |
| 587 | int dataoff; |
| 588 | int ret; |
| 589 | |
| 590 | /* Until there's been traffic both ways, don't look in packets. */ |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 591 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 592 | return NF_ACCEPT; |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 593 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 594 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 595 | |
| 596 | spin_lock_bh(&nf_h323_lock); |
| 597 | |
| 598 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 599 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 600 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 601 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 602 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 603 | |
| 604 | /* Decode H.245 signal */ |
| 605 | ret = DecodeMultimediaSystemControlMessage(data, datalen, |
| 606 | &mscm); |
| 607 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 608 | pr_debug("nf_ct_h245: decoding error: %s\n", |
| 609 | ret == H323_ERROR_BOUND ? |
| 610 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 611 | /* We don't drop when decoding error */ |
| 612 | break; |
| 613 | } |
| 614 | |
| 615 | /* Process H.245 signal */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 616 | if (process_h245(skb, ct, ctinfo, protoff, |
| 617 | &data, dataoff, &mscm) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 618 | goto drop; |
| 619 | } |
| 620 | |
| 621 | spin_unlock_bh(&nf_h323_lock); |
| 622 | return NF_ACCEPT; |
| 623 | |
| 624 | drop: |
| 625 | spin_unlock_bh(&nf_h323_lock); |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 626 | nf_ct_helper_log(skb, ct, "cannot process H.245 message"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 627 | return NF_DROP; |
| 628 | } |
| 629 | |
| 630 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 631 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
| 632 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, |
| 633 | .timeout = 240, |
| 634 | }; |
| 635 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 636 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
| 637 | .name = "H.245", |
| 638 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 639 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 640 | .tuple.src.l3num = AF_UNSPEC, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 641 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 642 | .help = h245_help, |
| 643 | .expect_policy = &h245_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 644 | }; |
| 645 | |
| 646 | /****************************************************************************/ |
| 647 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, |
| 648 | TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 649 | union nf_inet_addr *addr, __be16 *port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 650 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 651 | const unsigned char *p; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 652 | int len; |
| 653 | |
| 654 | switch (taddr->choice) { |
| 655 | case eTransportAddress_ipAddress: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 656 | if (nf_ct_l3num(ct) != AF_INET) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 657 | return 0; |
| 658 | p = data + taddr->ipAddress.ip; |
| 659 | len = 4; |
| 660 | break; |
| 661 | case eTransportAddress_ip6Address: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 662 | if (nf_ct_l3num(ct) != AF_INET6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 663 | return 0; |
Jing Min Zhao | bb80724 | 2007-05-24 16:43:07 -0700 | [diff] [blame] | 664 | p = data + taddr->ip6Address.ip; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 665 | len = 16; |
| 666 | break; |
| 667 | default: |
| 668 | return 0; |
| 669 | } |
| 670 | |
| 671 | memcpy(addr, p, len); |
| 672 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 673 | memcpy(port, p + len, sizeof(__be16)); |
| 674 | |
| 675 | return 1; |
| 676 | } |
| 677 | |
| 678 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 679 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 680 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 681 | unsigned int protoff, unsigned char **data, int dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 682 | TransportAddress *taddr) |
| 683 | { |
| 684 | int dir = CTINFO2DIR(ctinfo); |
| 685 | int ret = 0; |
| 686 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 687 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 688 | struct nf_conntrack_expect *exp; |
| 689 | typeof(nat_h245_hook) nat_h245; |
| 690 | |
| 691 | /* Read h245Address */ |
| 692 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || |
| 693 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 694 | port == 0) |
| 695 | return 0; |
| 696 | |
| 697 | /* Create expect for h245 connection */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 698 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 699 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 700 | 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] | 701 | &ct->tuplehash[!dir].tuple.src.u3, |
| 702 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 703 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 704 | exp->helper = &nf_conntrack_helper_h245; |
| 705 | |
| 706 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 707 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 708 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 709 | (nat_h245 = rcu_dereference(nat_h245_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 710 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 711 | ct->status & IPS_NAT_MASK) { |
| 712 | /* NAT needed */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 713 | ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 714 | port, exp); |
| 715 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 716 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 717 | pr_debug("nf_ct_q931: expect H.245 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 718 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 719 | } else |
| 720 | ret = -1; |
| 721 | } |
| 722 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 723 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 724 | |
| 725 | return ret; |
| 726 | } |
| 727 | |
| 728 | /* If the calling party is on the same side of the forward-to party, |
| 729 | * we don't need to track the second call */ |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 730 | static int callforward_do_filter(const union nf_inet_addr *src, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 731 | const union nf_inet_addr *dst, |
| 732 | u_int8_t family) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 733 | { |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 734 | const struct nf_afinfo *afinfo; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 735 | int ret = 0; |
| 736 | |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 737 | /* rcu_read_lock()ed by nf_hook_slow() */ |
| 738 | afinfo = nf_get_afinfo(family); |
| 739 | if (!afinfo) |
| 740 | return 0; |
| 741 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 742 | switch (family) { |
| 743 | case AF_INET: { |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 744 | struct flowi4 fl1, fl2; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 745 | struct rtable *rt1, *rt2; |
| 746 | |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 747 | memset(&fl1, 0, sizeof(fl1)); |
| 748 | fl1.daddr = src->ip; |
| 749 | |
| 750 | memset(&fl2, 0, sizeof(fl2)); |
| 751 | fl2.daddr = dst->ip; |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 752 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 753 | flowi4_to_flowi(&fl1), false)) { |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 754 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 755 | flowi4_to_flowi(&fl2), false)) { |
Julian Anastasov | bbb5823 | 2012-10-09 13:00:47 +0000 | [diff] [blame] | 756 | if (rt_nexthop(rt1, fl1.daddr) == |
| 757 | rt_nexthop(rt2, fl2.daddr) && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 758 | rt1->dst.dev == rt2->dst.dev) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 759 | ret = 1; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 760 | dst_release(&rt2->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 761 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 762 | dst_release(&rt1->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 763 | } |
| 764 | break; |
| 765 | } |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 766 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 767 | case AF_INET6: { |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 768 | struct flowi6 fl1, fl2; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 769 | struct rt6_info *rt1, *rt2; |
| 770 | |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 771 | memset(&fl1, 0, sizeof(fl1)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 772 | fl1.daddr = src->in6; |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 773 | |
| 774 | memset(&fl2, 0, sizeof(fl2)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 775 | fl2.daddr = dst->in6; |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 776 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 777 | flowi6_to_flowi(&fl1), false)) { |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 778 | if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 779 | flowi6_to_flowi(&fl2), false)) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 780 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 781 | sizeof(rt1->rt6i_gateway)) && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 782 | rt1->dst.dev == rt2->dst.dev) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 783 | ret = 1; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 784 | dst_release(&rt2->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 785 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 786 | dst_release(&rt1->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 787 | } |
| 788 | break; |
| 789 | } |
| 790 | #endif |
| 791 | } |
| 792 | return ret; |
| 793 | |
| 794 | } |
| 795 | |
| 796 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 797 | static int expect_callforwarding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 798 | struct nf_conn *ct, |
| 799 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 800 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 801 | unsigned char **data, int dataoff, |
| 802 | TransportAddress *taddr) |
| 803 | { |
| 804 | int dir = CTINFO2DIR(ctinfo); |
| 805 | int ret = 0; |
| 806 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 807 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 808 | struct nf_conntrack_expect *exp; |
| 809 | typeof(nat_callforwarding_hook) nat_callforwarding; |
| 810 | |
| 811 | /* Read alternativeAddress */ |
| 812 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) |
| 813 | return 0; |
| 814 | |
| 815 | /* If the calling party is on the same side of the forward-to party, |
| 816 | * we don't need to track the second call */ |
| 817 | if (callforward_filter && |
| 818 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 819 | nf_ct_l3num(ct))) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 820 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 821 | return 0; |
| 822 | } |
| 823 | |
| 824 | /* Create expect for the second call leg */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 825 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 826 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 827 | 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] | 828 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 829 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 830 | exp->helper = nf_conntrack_helper_q931; |
| 831 | |
| 832 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 833 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 834 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 835 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 836 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 837 | ct->status & IPS_NAT_MASK) { |
| 838 | /* Need NAT */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 839 | ret = nat_callforwarding(skb, ct, ctinfo, |
| 840 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 841 | taddr, port, exp); |
| 842 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 843 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 844 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 845 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 846 | } else |
| 847 | ret = -1; |
| 848 | } |
| 849 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 850 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 851 | |
| 852 | return ret; |
| 853 | } |
| 854 | |
| 855 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 856 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 857 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 858 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 859 | unsigned char **data, int dataoff, |
| 860 | Setup_UUIE *setup) |
| 861 | { |
| 862 | int dir = CTINFO2DIR(ctinfo); |
| 863 | int ret; |
| 864 | int i; |
| 865 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 866 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 867 | typeof(set_h225_addr_hook) set_h225_addr; |
| 868 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 869 | pr_debug("nf_ct_q931: Setup\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 870 | |
| 871 | if (setup->options & eSetup_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 872 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 873 | &setup->h245Address); |
| 874 | if (ret < 0) |
| 875 | return -1; |
| 876 | } |
| 877 | |
| 878 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 879 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 880 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 881 | ct->status & IPS_NAT_MASK && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 882 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 883 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 884 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 885 | pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 886 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 887 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 888 | ret = set_h225_addr(skb, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 889 | &setup->destCallSignalAddress, |
| 890 | &ct->tuplehash[!dir].tuple.src.u3, |
| 891 | ct->tuplehash[!dir].tuple.src.u.tcp.port); |
| 892 | if (ret < 0) |
| 893 | return -1; |
| 894 | } |
| 895 | |
| 896 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 897 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 898 | ct->status & IPS_NAT_MASK && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 899 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 900 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 901 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 902 | pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 903 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 904 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 905 | ret = set_h225_addr(skb, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 906 | &setup->sourceCallSignalAddress, |
| 907 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 908 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); |
| 909 | if (ret < 0) |
| 910 | return -1; |
| 911 | } |
| 912 | |
| 913 | if (setup->options & eSetup_UUIE_fastStart) { |
| 914 | for (i = 0; i < setup->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 915 | ret = process_olc(skb, ct, ctinfo, |
| 916 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 917 | &setup->fastStart.item[i]); |
| 918 | if (ret < 0) |
| 919 | return -1; |
| 920 | } |
| 921 | } |
| 922 | |
| 923 | return 0; |
| 924 | } |
| 925 | |
| 926 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 927 | static int process_callproceeding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 928 | struct nf_conn *ct, |
| 929 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 930 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 931 | unsigned char **data, int dataoff, |
| 932 | CallProceeding_UUIE *callproc) |
| 933 | { |
| 934 | int ret; |
| 935 | int i; |
| 936 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 937 | pr_debug("nf_ct_q931: CallProceeding\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 938 | |
| 939 | if (callproc->options & eCallProceeding_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 940 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 941 | &callproc->h245Address); |
| 942 | if (ret < 0) |
| 943 | return -1; |
| 944 | } |
| 945 | |
| 946 | if (callproc->options & eCallProceeding_UUIE_fastStart) { |
| 947 | for (i = 0; i < callproc->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 948 | ret = process_olc(skb, ct, ctinfo, |
| 949 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 950 | &callproc->fastStart.item[i]); |
| 951 | if (ret < 0) |
| 952 | return -1; |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | return 0; |
| 957 | } |
| 958 | |
| 959 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 960 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 961 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 962 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 963 | unsigned char **data, int dataoff, |
| 964 | Connect_UUIE *connect) |
| 965 | { |
| 966 | int ret; |
| 967 | int i; |
| 968 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 969 | pr_debug("nf_ct_q931: Connect\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 970 | |
| 971 | if (connect->options & eConnect_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 972 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 973 | &connect->h245Address); |
| 974 | if (ret < 0) |
| 975 | return -1; |
| 976 | } |
| 977 | |
| 978 | if (connect->options & eConnect_UUIE_fastStart) { |
| 979 | for (i = 0; i < connect->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 980 | ret = process_olc(skb, ct, ctinfo, |
| 981 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 982 | &connect->fastStart.item[i]); |
| 983 | if (ret < 0) |
| 984 | return -1; |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | return 0; |
| 989 | } |
| 990 | |
| 991 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 992 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 993 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 994 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 995 | unsigned char **data, int dataoff, |
| 996 | Alerting_UUIE *alert) |
| 997 | { |
| 998 | int ret; |
| 999 | int i; |
| 1000 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1001 | pr_debug("nf_ct_q931: Alerting\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1002 | |
| 1003 | if (alert->options & eAlerting_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1004 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1005 | &alert->h245Address); |
| 1006 | if (ret < 0) |
| 1007 | return -1; |
| 1008 | } |
| 1009 | |
| 1010 | if (alert->options & eAlerting_UUIE_fastStart) { |
| 1011 | for (i = 0; i < alert->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1012 | ret = process_olc(skb, ct, ctinfo, |
| 1013 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1014 | &alert->fastStart.item[i]); |
| 1015 | if (ret < 0) |
| 1016 | return -1; |
| 1017 | } |
| 1018 | } |
| 1019 | |
| 1020 | return 0; |
| 1021 | } |
| 1022 | |
| 1023 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1024 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1025 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1026 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1027 | unsigned char **data, int dataoff, |
| 1028 | Facility_UUIE *facility) |
| 1029 | { |
| 1030 | int ret; |
| 1031 | int i; |
| 1032 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1033 | pr_debug("nf_ct_q931: Facility\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1034 | |
| 1035 | if (facility->reason.choice == eFacilityReason_callForwarded) { |
| 1036 | if (facility->options & eFacility_UUIE_alternativeAddress) |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1037 | return expect_callforwarding(skb, ct, ctinfo, |
| 1038 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1039 | &facility-> |
| 1040 | alternativeAddress); |
| 1041 | return 0; |
| 1042 | } |
| 1043 | |
| 1044 | if (facility->options & eFacility_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1045 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1046 | &facility->h245Address); |
| 1047 | if (ret < 0) |
| 1048 | return -1; |
| 1049 | } |
| 1050 | |
| 1051 | if (facility->options & eFacility_UUIE_fastStart) { |
| 1052 | for (i = 0; i < facility->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1053 | ret = process_olc(skb, ct, ctinfo, |
| 1054 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1055 | &facility->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_progress(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, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1067 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1068 | unsigned char **data, int dataoff, |
| 1069 | Progress_UUIE *progress) |
| 1070 | { |
| 1071 | int ret; |
| 1072 | int i; |
| 1073 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1074 | pr_debug("nf_ct_q931: Progress\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1075 | |
| 1076 | if (progress->options & eProgress_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1077 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1078 | &progress->h245Address); |
| 1079 | if (ret < 0) |
| 1080 | return -1; |
| 1081 | } |
| 1082 | |
| 1083 | if (progress->options & eProgress_UUIE_fastStart) { |
| 1084 | for (i = 0; i < progress->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1085 | ret = process_olc(skb, ct, ctinfo, |
| 1086 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1087 | &progress->fastStart.item[i]); |
| 1088 | if (ret < 0) |
| 1089 | return -1; |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | return 0; |
| 1094 | } |
| 1095 | |
| 1096 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1097 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1098 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1099 | unsigned int protoff, unsigned char **data, int dataoff, |
| 1100 | Q931 *q931) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1101 | { |
| 1102 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; |
| 1103 | int i; |
| 1104 | int ret = 0; |
| 1105 | |
| 1106 | switch (pdu->h323_message_body.choice) { |
| 1107 | case eH323_UU_PDU_h323_message_body_setup: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1108 | ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1109 | &pdu->h323_message_body.setup); |
| 1110 | break; |
| 1111 | case eH323_UU_PDU_h323_message_body_callProceeding: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1112 | ret = process_callproceeding(skb, ct, ctinfo, |
| 1113 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1114 | &pdu->h323_message_body. |
| 1115 | callProceeding); |
| 1116 | break; |
| 1117 | case eH323_UU_PDU_h323_message_body_connect: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1118 | ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1119 | &pdu->h323_message_body.connect); |
| 1120 | break; |
| 1121 | case eH323_UU_PDU_h323_message_body_alerting: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1122 | ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1123 | &pdu->h323_message_body.alerting); |
| 1124 | break; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1125 | case eH323_UU_PDU_h323_message_body_facility: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1126 | ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1127 | &pdu->h323_message_body.facility); |
| 1128 | break; |
| 1129 | case eH323_UU_PDU_h323_message_body_progress: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1130 | ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1131 | &pdu->h323_message_body.progress); |
| 1132 | break; |
| 1133 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1134 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
| 1135 | pdu->h323_message_body.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1136 | break; |
| 1137 | } |
| 1138 | |
| 1139 | if (ret < 0) |
| 1140 | return -1; |
| 1141 | |
| 1142 | if (pdu->options & eH323_UU_PDU_h245Control) { |
| 1143 | for (i = 0; i < pdu->h245Control.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1144 | ret = process_h245(skb, ct, ctinfo, |
| 1145 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1146 | &pdu->h245Control.item[i]); |
| 1147 | if (ret < 0) |
| 1148 | return -1; |
| 1149 | } |
| 1150 | } |
| 1151 | |
| 1152 | return 0; |
| 1153 | } |
| 1154 | |
| 1155 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1156 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1157 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1158 | { |
| 1159 | static Q931 q931; |
| 1160 | unsigned char *data = NULL; |
| 1161 | int datalen; |
| 1162 | int dataoff; |
| 1163 | int ret; |
| 1164 | |
| 1165 | /* Until there's been traffic both ways, don't look in packets. */ |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1166 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1167 | return NF_ACCEPT; |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1168 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1169 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1170 | |
| 1171 | spin_lock_bh(&nf_h323_lock); |
| 1172 | |
| 1173 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1174 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1175 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1176 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1177 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1178 | |
| 1179 | /* Decode Q.931 signal */ |
| 1180 | ret = DecodeQ931(data, datalen, &q931); |
| 1181 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1182 | pr_debug("nf_ct_q931: decoding error: %s\n", |
| 1183 | ret == H323_ERROR_BOUND ? |
| 1184 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1185 | /* We don't drop when decoding error */ |
| 1186 | break; |
| 1187 | } |
| 1188 | |
| 1189 | /* Process Q.931 signal */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1190 | if (process_q931(skb, ct, ctinfo, protoff, |
| 1191 | &data, dataoff, &q931) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1192 | goto drop; |
| 1193 | } |
| 1194 | |
| 1195 | spin_unlock_bh(&nf_h323_lock); |
| 1196 | return NF_ACCEPT; |
| 1197 | |
| 1198 | drop: |
| 1199 | spin_unlock_bh(&nf_h323_lock); |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 1200 | nf_ct_helper_log(skb, ct, "cannot process Q.931 message"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1201 | return NF_DROP; |
| 1202 | } |
| 1203 | |
| 1204 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1205 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
| 1206 | /* T.120 and H.245 */ |
| 1207 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, |
| 1208 | .timeout = 240, |
| 1209 | }; |
| 1210 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1211 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
| 1212 | { |
| 1213 | .name = "Q.931", |
| 1214 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1215 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1216 | .tuple.src.l3num = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1217 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1218 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1219 | .help = q931_help, |
| 1220 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1221 | }, |
| 1222 | { |
| 1223 | .name = "Q.931", |
| 1224 | .me = THIS_MODULE, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1225 | .tuple.src.l3num = AF_INET6, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1226 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1227 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1228 | .help = q931_help, |
| 1229 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1230 | }, |
| 1231 | }; |
| 1232 | |
| 1233 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1234 | 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] | 1235 | int *datalen) |
| 1236 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 1237 | const struct udphdr *uh; |
| 1238 | struct udphdr _uh; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1239 | int dataoff; |
| 1240 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1241 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1242 | if (uh == NULL) |
| 1243 | return NULL; |
| 1244 | dataoff = protoff + sizeof(_uh); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1245 | if (dataoff >= skb->len) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1246 | return NULL; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1247 | *datalen = skb->len - dataoff; |
| 1248 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1249 | } |
| 1250 | |
| 1251 | /****************************************************************************/ |
| 1252 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1253 | union nf_inet_addr *addr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1254 | __be16 port) |
| 1255 | { |
Alexey Dobriyan | 84541cc | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1256 | struct net *net = nf_ct_net(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1257 | struct nf_conntrack_expect *exp; |
| 1258 | struct nf_conntrack_tuple tuple; |
| 1259 | |
| 1260 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); |
| 1261 | tuple.src.u.tcp.port = 0; |
| 1262 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); |
| 1263 | tuple.dst.u.tcp.port = port; |
| 1264 | tuple.dst.protonum = IPPROTO_TCP; |
| 1265 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1266 | exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1267 | if (exp && exp->master == ct) |
| 1268 | return exp; |
| 1269 | return NULL; |
| 1270 | } |
| 1271 | |
| 1272 | /****************************************************************************/ |
| 1273 | static int set_expect_timeout(struct nf_conntrack_expect *exp, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1274 | unsigned int timeout) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1275 | { |
| 1276 | if (!exp || !del_timer(&exp->timeout)) |
| 1277 | return 0; |
| 1278 | |
| 1279 | exp->timeout.expires = jiffies + timeout * HZ; |
| 1280 | add_timer(&exp->timeout); |
| 1281 | |
| 1282 | return 1; |
| 1283 | } |
| 1284 | |
| 1285 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1286 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1287 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1288 | unsigned int protoff, unsigned char **data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1289 | TransportAddress *taddr, int count) |
| 1290 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1291 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1292 | int dir = CTINFO2DIR(ctinfo); |
| 1293 | int ret = 0; |
| 1294 | int i; |
| 1295 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1296 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1297 | struct nf_conntrack_expect *exp; |
| 1298 | typeof(nat_q931_hook) nat_q931; |
| 1299 | |
| 1300 | /* Look for the first related address */ |
| 1301 | for (i = 0; i < count; i++) { |
| 1302 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && |
| 1303 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1304 | sizeof(addr)) == 0 && port != 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1305 | break; |
| 1306 | } |
| 1307 | |
| 1308 | if (i >= count) /* Not found */ |
| 1309 | return 0; |
| 1310 | |
| 1311 | /* Create expect for Q.931 */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1312 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1313 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1314 | 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] | 1315 | gkrouted_only ? /* only accept calls from GK? */ |
| 1316 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, |
| 1317 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1318 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1319 | exp->helper = nf_conntrack_helper_q931; |
| 1320 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ |
| 1321 | |
| 1322 | nat_q931 = rcu_dereference(nat_q931_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1323 | if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1324 | ct->status & IPS_NAT_MASK) { /* Need NAT */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1325 | ret = nat_q931(skb, ct, ctinfo, protoff, data, |
| 1326 | taddr, i, port, exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1327 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1328 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1329 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1330 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1331 | |
| 1332 | /* Save port for looking up expect in processing RCF */ |
| 1333 | info->sig_port[dir] = port; |
| 1334 | } else |
| 1335 | ret = -1; |
| 1336 | } |
| 1337 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1338 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1339 | |
| 1340 | return ret; |
| 1341 | } |
| 1342 | |
| 1343 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1344 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1345 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1346 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1347 | unsigned char **data, GatekeeperRequest *grq) |
| 1348 | { |
| 1349 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1350 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1351 | pr_debug("nf_ct_ras: GRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1352 | |
| 1353 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1354 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1355 | ct->status & IPS_NAT_MASK) /* NATed */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1356 | return set_ras_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1357 | &grq->rasAddress, 1); |
| 1358 | return 0; |
| 1359 | } |
| 1360 | |
| 1361 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1362 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1363 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1364 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1365 | unsigned char **data, GatekeeperConfirm *gcf) |
| 1366 | { |
| 1367 | int dir = CTINFO2DIR(ctinfo); |
| 1368 | int ret = 0; |
| 1369 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1370 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1371 | struct nf_conntrack_expect *exp; |
| 1372 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1373 | pr_debug("nf_ct_ras: GCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1374 | |
| 1375 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) |
| 1376 | return 0; |
| 1377 | |
| 1378 | /* Registration port is the same as discovery port */ |
| 1379 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1380 | port == ct->tuplehash[dir].tuple.src.u.udp.port) |
| 1381 | return 0; |
| 1382 | |
| 1383 | /* Avoid RAS expectation loops. A GCF is never expected. */ |
| 1384 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
| 1385 | return 0; |
| 1386 | |
| 1387 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1388 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1389 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1390 | 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] | 1391 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1392 | IPPROTO_UDP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1393 | exp->helper = nf_conntrack_helper_ras; |
| 1394 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1395 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1396 | pr_debug("nf_ct_ras: expect RAS "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1397 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1398 | } else |
| 1399 | ret = -1; |
| 1400 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1401 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1402 | |
| 1403 | return ret; |
| 1404 | } |
| 1405 | |
| 1406 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1407 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1408 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1409 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1410 | unsigned char **data, RegistrationRequest *rrq) |
| 1411 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1412 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1413 | int ret; |
| 1414 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1415 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1416 | pr_debug("nf_ct_ras: RRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1417 | |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1418 | ret = expect_q931(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1419 | rrq->callSignalAddress.item, |
| 1420 | rrq->callSignalAddress.count); |
| 1421 | if (ret < 0) |
| 1422 | return -1; |
| 1423 | |
| 1424 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1425 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1426 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1427 | ret = set_ras_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1428 | rrq->rasAddress.item, |
| 1429 | rrq->rasAddress.count); |
| 1430 | if (ret < 0) |
| 1431 | return -1; |
| 1432 | } |
| 1433 | |
| 1434 | if (rrq->options & eRegistrationRequest_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1435 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1436 | info->timeout = rrq->timeToLive; |
| 1437 | } else |
| 1438 | info->timeout = default_rrq_ttl; |
| 1439 | |
| 1440 | return 0; |
| 1441 | } |
| 1442 | |
| 1443 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1444 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1445 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1446 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1447 | unsigned char **data, RegistrationConfirm *rcf) |
| 1448 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1449 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1450 | int dir = CTINFO2DIR(ctinfo); |
| 1451 | int ret; |
| 1452 | struct nf_conntrack_expect *exp; |
| 1453 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1454 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1455 | pr_debug("nf_ct_ras: RCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1456 | |
| 1457 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1458 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1459 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1460 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1461 | rcf->callSignalAddress.item, |
| 1462 | rcf->callSignalAddress.count); |
| 1463 | if (ret < 0) |
| 1464 | return -1; |
| 1465 | } |
| 1466 | |
| 1467 | if (rcf->options & eRegistrationConfirm_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1468 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1469 | info->timeout = rcf->timeToLive; |
| 1470 | } |
| 1471 | |
| 1472 | if (info->timeout > 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1473 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
| 1474 | "%u seconds\n", info->timeout); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1475 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1476 | |
| 1477 | /* Set expect timeout */ |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1478 | spin_lock_bh(&nf_conntrack_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1479 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
| 1480 | info->sig_port[!dir]); |
| 1481 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1482 | pr_debug("nf_ct_ras: set Q.931 expect " |
| 1483 | "timeout to %u seconds for", |
| 1484 | info->timeout); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1485 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1486 | set_expect_timeout(exp, info->timeout); |
| 1487 | } |
Patrick McHardy | f8ba1af | 2008-01-31 04:38:58 -0800 | [diff] [blame] | 1488 | spin_unlock_bh(&nf_conntrack_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1489 | } |
| 1490 | |
| 1491 | return 0; |
| 1492 | } |
| 1493 | |
| 1494 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1495 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1496 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1497 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1498 | unsigned char **data, UnregistrationRequest *urq) |
| 1499 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1500 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1501 | int dir = CTINFO2DIR(ctinfo); |
| 1502 | int ret; |
| 1503 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1504 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1505 | pr_debug("nf_ct_ras: URQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1506 | |
| 1507 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1508 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1509 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1510 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1511 | urq->callSignalAddress.item, |
| 1512 | urq->callSignalAddress.count); |
| 1513 | if (ret < 0) |
| 1514 | return -1; |
| 1515 | } |
| 1516 | |
| 1517 | /* Clear old expect */ |
| 1518 | nf_ct_remove_expectations(ct); |
| 1519 | info->sig_port[dir] = 0; |
| 1520 | info->sig_port[!dir] = 0; |
| 1521 | |
| 1522 | /* Give it 30 seconds for UCF or URJ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1523 | nf_ct_refresh(ct, skb, 30 * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1524 | |
| 1525 | return 0; |
| 1526 | } |
| 1527 | |
| 1528 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1529 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1530 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1531 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1532 | unsigned char **data, AdmissionRequest *arq) |
| 1533 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1534 | const struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1535 | int dir = CTINFO2DIR(ctinfo); |
| 1536 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1537 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1538 | typeof(set_h225_addr_hook) set_h225_addr; |
| 1539 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1540 | pr_debug("nf_ct_ras: ARQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1541 | |
| 1542 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 1543 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && |
| 1544 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1545 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1546 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1547 | port == info->sig_port[dir] && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1548 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1549 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
| 1550 | /* Answering ARQ */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1551 | return set_h225_addr(skb, protoff, data, 0, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1552 | &arq->destCallSignalAddress, |
| 1553 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1554 | info->sig_port[!dir]); |
| 1555 | } |
| 1556 | |
| 1557 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && |
| 1558 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1559 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1560 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1561 | set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1562 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1563 | /* Calling ARQ */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1564 | return set_h225_addr(skb, protoff, data, 0, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1565 | &arq->srcCallSignalAddress, |
| 1566 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1567 | port); |
| 1568 | } |
| 1569 | |
| 1570 | return 0; |
| 1571 | } |
| 1572 | |
| 1573 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1574 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1575 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1576 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1577 | unsigned char **data, AdmissionConfirm *acf) |
| 1578 | { |
| 1579 | int dir = CTINFO2DIR(ctinfo); |
| 1580 | int ret = 0; |
| 1581 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1582 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1583 | struct nf_conntrack_expect *exp; |
| 1584 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1585 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1586 | pr_debug("nf_ct_ras: ACF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1587 | |
| 1588 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, |
| 1589 | &addr, &port)) |
| 1590 | return 0; |
| 1591 | |
| 1592 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { |
| 1593 | /* Answering ACF */ |
| 1594 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1595 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1596 | ct->status & IPS_NAT_MASK) |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1597 | return set_sig_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1598 | &acf->destCallSignalAddress, 1); |
| 1599 | return 0; |
| 1600 | } |
| 1601 | |
| 1602 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1603 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1604 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1605 | 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] | 1606 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1607 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1608 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1609 | exp->helper = nf_conntrack_helper_q931; |
| 1610 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1611 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1612 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1613 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1614 | } else |
| 1615 | ret = -1; |
| 1616 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1617 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1618 | |
| 1619 | return ret; |
| 1620 | } |
| 1621 | |
| 1622 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1623 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1624 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1625 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1626 | unsigned char **data, LocationRequest *lrq) |
| 1627 | { |
| 1628 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1629 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1630 | pr_debug("nf_ct_ras: LRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1631 | |
| 1632 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1633 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1634 | ct->status & IPS_NAT_MASK) |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1635 | return set_ras_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1636 | &lrq->replyAddress, 1); |
| 1637 | return 0; |
| 1638 | } |
| 1639 | |
| 1640 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1641 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1642 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1643 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1644 | unsigned char **data, LocationConfirm *lcf) |
| 1645 | { |
| 1646 | int dir = CTINFO2DIR(ctinfo); |
| 1647 | int ret = 0; |
| 1648 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1649 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1650 | struct nf_conntrack_expect *exp; |
| 1651 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1652 | pr_debug("nf_ct_ras: LCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1653 | |
| 1654 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, |
| 1655 | &addr, &port)) |
| 1656 | return 0; |
| 1657 | |
| 1658 | /* Need new expect for call signal */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1659 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1660 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1661 | 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] | 1662 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1663 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1664 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1665 | exp->helper = nf_conntrack_helper_q931; |
| 1666 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1667 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1668 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1669 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1670 | } else |
| 1671 | ret = -1; |
| 1672 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1673 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1674 | |
| 1675 | /* Ignore rasAddress */ |
| 1676 | |
| 1677 | return ret; |
| 1678 | } |
| 1679 | |
| 1680 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1681 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1682 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1683 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1684 | unsigned char **data, InfoRequestResponse *irr) |
| 1685 | { |
| 1686 | int ret; |
| 1687 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1688 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1689 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1690 | pr_debug("nf_ct_ras: IRR\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1691 | |
| 1692 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1693 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1694 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1695 | ret = set_ras_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1696 | &irr->rasAddress, 1); |
| 1697 | if (ret < 0) |
| 1698 | return -1; |
| 1699 | } |
| 1700 | |
| 1701 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1702 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1703 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1704 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1705 | irr->callSignalAddress.item, |
| 1706 | irr->callSignalAddress.count); |
| 1707 | if (ret < 0) |
| 1708 | return -1; |
| 1709 | } |
| 1710 | |
| 1711 | return 0; |
| 1712 | } |
| 1713 | |
| 1714 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1715 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1716 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1717 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1718 | unsigned char **data, RasMessage *ras) |
| 1719 | { |
| 1720 | switch (ras->choice) { |
| 1721 | case eRasMessage_gatekeeperRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1722 | return process_grq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1723 | &ras->gatekeeperRequest); |
| 1724 | case eRasMessage_gatekeeperConfirm: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1725 | return process_gcf(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1726 | &ras->gatekeeperConfirm); |
| 1727 | case eRasMessage_registrationRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1728 | return process_rrq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1729 | &ras->registrationRequest); |
| 1730 | case eRasMessage_registrationConfirm: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1731 | return process_rcf(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1732 | &ras->registrationConfirm); |
| 1733 | case eRasMessage_unregistrationRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1734 | return process_urq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1735 | &ras->unregistrationRequest); |
| 1736 | case eRasMessage_admissionRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1737 | return process_arq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1738 | &ras->admissionRequest); |
| 1739 | case eRasMessage_admissionConfirm: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1740 | return process_acf(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1741 | &ras->admissionConfirm); |
| 1742 | case eRasMessage_locationRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1743 | return process_lrq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1744 | &ras->locationRequest); |
| 1745 | case eRasMessage_locationConfirm: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1746 | return process_lcf(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1747 | &ras->locationConfirm); |
| 1748 | case eRasMessage_infoRequestResponse: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1749 | return process_irr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1750 | &ras->infoRequestResponse); |
| 1751 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1752 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1753 | break; |
| 1754 | } |
| 1755 | |
| 1756 | return 0; |
| 1757 | } |
| 1758 | |
| 1759 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1760 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1761 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1762 | { |
| 1763 | static RasMessage ras; |
| 1764 | unsigned char *data; |
| 1765 | int datalen = 0; |
| 1766 | int ret; |
| 1767 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1768 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1769 | |
| 1770 | spin_lock_bh(&nf_h323_lock); |
| 1771 | |
| 1772 | /* Get UDP data */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1773 | data = get_udp_data(skb, protoff, &datalen); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1774 | if (data == NULL) |
| 1775 | goto accept; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1776 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1777 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1778 | |
| 1779 | /* Decode RAS message */ |
| 1780 | ret = DecodeRasMessage(data, datalen, &ras); |
| 1781 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1782 | pr_debug("nf_ct_ras: decoding error: %s\n", |
| 1783 | ret == H323_ERROR_BOUND ? |
| 1784 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1785 | goto accept; |
| 1786 | } |
| 1787 | |
| 1788 | /* Process RAS message */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1789 | if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1790 | goto drop; |
| 1791 | |
| 1792 | accept: |
| 1793 | spin_unlock_bh(&nf_h323_lock); |
| 1794 | return NF_ACCEPT; |
| 1795 | |
| 1796 | drop: |
| 1797 | spin_unlock_bh(&nf_h323_lock); |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 1798 | nf_ct_helper_log(skb, ct, "cannot process RAS message"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1799 | return NF_DROP; |
| 1800 | } |
| 1801 | |
| 1802 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1803 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
| 1804 | .max_expected = 32, |
| 1805 | .timeout = 240, |
| 1806 | }; |
| 1807 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1808 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
| 1809 | { |
| 1810 | .name = "RAS", |
| 1811 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1812 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1813 | .tuple.src.l3num = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1814 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1815 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1816 | .help = ras_help, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1817 | .expect_policy = &ras_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1818 | }, |
| 1819 | { |
| 1820 | .name = "RAS", |
| 1821 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1822 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1823 | .tuple.src.l3num = AF_INET6, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1824 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1825 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1826 | .help = ras_help, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1827 | .expect_policy = &ras_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1828 | }, |
| 1829 | }; |
| 1830 | |
| 1831 | /****************************************************************************/ |
| 1832 | static void __exit nf_conntrack_h323_fini(void) |
| 1833 | { |
| 1834 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); |
| 1835 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
| 1836 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
| 1837 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1838 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1839 | kfree(h323_buffer); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1840 | pr_debug("nf_ct_h323: fini\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1841 | } |
| 1842 | |
| 1843 | /****************************************************************************/ |
| 1844 | static int __init nf_conntrack_h323_init(void) |
| 1845 | { |
| 1846 | int ret; |
| 1847 | |
| 1848 | h323_buffer = kmalloc(65536, GFP_KERNEL); |
| 1849 | if (!h323_buffer) |
| 1850 | return -ENOMEM; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1851 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1852 | if (ret < 0) |
| 1853 | goto err1; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1854 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1855 | if (ret < 0) |
| 1856 | goto err2; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1857 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1858 | if (ret < 0) |
| 1859 | goto err3; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1860 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1861 | if (ret < 0) |
| 1862 | goto err4; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1863 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); |
| 1864 | if (ret < 0) |
| 1865 | goto err5; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1866 | pr_debug("nf_ct_h323: init success\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1867 | return 0; |
| 1868 | |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1869 | err5: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1870 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1871 | err4: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1872 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1873 | err3: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1874 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1875 | err2: |
| 1876 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1877 | err1: |
Patrick McHardy | 8a54886 | 2008-06-17 15:52:07 -0700 | [diff] [blame] | 1878 | kfree(h323_buffer); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1879 | return ret; |
| 1880 | } |
| 1881 | |
| 1882 | /****************************************************************************/ |
| 1883 | module_init(nf_conntrack_h323_init); |
| 1884 | module_exit(nf_conntrack_h323_fini); |
| 1885 | |
| 1886 | EXPORT_SYMBOL_GPL(get_h225_addr); |
| 1887 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); |
| 1888 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); |
| 1889 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); |
| 1890 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); |
| 1891 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); |
| 1892 | EXPORT_SYMBOL_GPL(nat_t120_hook); |
| 1893 | EXPORT_SYMBOL_GPL(nat_h245_hook); |
| 1894 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); |
| 1895 | EXPORT_SYMBOL_GPL(nat_q931_hook); |
| 1896 | |
| 1897 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); |
| 1898 | MODULE_DESCRIPTION("H.323 connection tracking helper"); |
| 1899 | MODULE_LICENSE("GPL"); |
| 1900 | MODULE_ALIAS("ip_conntrack_h323"); |
Pablo Neira Ayuso | be3eed2 | 2012-05-14 00:42:02 +0200 | [diff] [blame] | 1901 | MODULE_ALIAS_NFCT_HELPER("RAS"); |
| 1902 | MODULE_ALIAS_NFCT_HELPER("Q.931"); |
| 1903 | MODULE_ALIAS_NFCT_HELPER("H.245"); |