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> |
Patrick McHardy | f229f6c | 2013-04-06 15:24:29 +0200 | [diff] [blame] | 5 | * Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net> |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 6 | * |
| 7 | * This source code is licensed under General Public License version 2. |
| 8 | * |
| 9 | * Based on the 'brute force' H.323 connection tracking module by |
| 10 | * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| 11 | * |
| 12 | * For more information, please see http://nath323.sourceforge.net/ |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/moduleparam.h> |
| 17 | #include <linux/ctype.h> |
| 18 | #include <linux/inet.h> |
| 19 | #include <linux/in.h> |
| 20 | #include <linux/ip.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 22 | #include <linux/udp.h> |
| 23 | #include <linux/tcp.h> |
| 24 | #include <linux/skbuff.h> |
| 25 | #include <net/route.h> |
| 26 | #include <net/ip6_route.h> |
| 27 | |
| 28 | #include <net/netfilter/nf_conntrack.h> |
| 29 | #include <net/netfilter/nf_conntrack_core.h> |
| 30 | #include <net/netfilter/nf_conntrack_tuple.h> |
| 31 | #include <net/netfilter/nf_conntrack_expect.h> |
| 32 | #include <net/netfilter/nf_conntrack_ecache.h> |
| 33 | #include <net/netfilter/nf_conntrack_helper.h> |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 34 | #include <net/netfilter/nf_conntrack_zones.h> |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 35 | #include <linux/netfilter/nf_conntrack_h323.h> |
| 36 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 37 | /* Parameters */ |
| 38 | static unsigned int default_rrq_ttl __read_mostly = 300; |
| 39 | module_param(default_rrq_ttl, uint, 0600); |
| 40 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); |
| 41 | |
| 42 | static int gkrouted_only __read_mostly = 1; |
| 43 | module_param(gkrouted_only, int, 0600); |
| 44 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); |
| 45 | |
Rusty Russell | eb93992 | 2011-12-19 14:08:01 +0000 | [diff] [blame] | 46 | static bool callforward_filter __read_mostly = true; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 47 | module_param(callforward_filter, bool, 0600); |
| 48 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 49 | "if both endpoints are on different sides " |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 50 | "(determined by routing information)"); |
| 51 | |
| 52 | /* Hooks for NAT */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 53 | int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 54 | unsigned char **data, int dataoff, |
| 55 | H245_TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 56 | union nf_inet_addr *addr, __be16 port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 57 | __read_mostly; |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 58 | int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 59 | unsigned char **data, int dataoff, |
| 60 | TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 61 | union nf_inet_addr *addr, __be16 port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 62 | __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 63 | int (*set_sig_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 64 | struct nf_conn *ct, |
| 65 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 66 | unsigned int protoff, unsigned char **data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 67 | TransportAddress *taddr, int count) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 68 | int (*set_ras_addr_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 69 | struct nf_conn *ct, |
| 70 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 71 | unsigned int protoff, unsigned char **data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 72 | TransportAddress *taddr, int count) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 73 | int (*nat_rtp_rtcp_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 74 | struct nf_conn *ct, |
| 75 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 76 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 77 | unsigned char **data, int dataoff, |
| 78 | H245_TransportAddress *taddr, |
| 79 | __be16 port, __be16 rtp_port, |
| 80 | struct nf_conntrack_expect *rtp_exp, |
| 81 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 82 | int (*nat_t120_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 83 | struct nf_conn *ct, |
| 84 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 85 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 86 | unsigned char **data, int dataoff, |
| 87 | H245_TransportAddress *taddr, __be16 port, |
| 88 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 89 | int (*nat_h245_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 90 | struct nf_conn *ct, |
| 91 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 92 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 93 | unsigned char **data, int dataoff, |
| 94 | TransportAddress *taddr, __be16 port, |
| 95 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 96 | int (*nat_callforwarding_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 97 | struct nf_conn *ct, |
| 98 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 99 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 100 | unsigned char **data, int dataoff, |
| 101 | TransportAddress *taddr, __be16 port, |
| 102 | struct nf_conntrack_expect *exp) __read_mostly; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 103 | int (*nat_q931_hook) (struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 104 | struct nf_conn *ct, |
| 105 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 106 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 107 | unsigned char **data, TransportAddress *taddr, int idx, |
| 108 | __be16 port, struct nf_conntrack_expect *exp) |
| 109 | __read_mostly; |
| 110 | |
| 111 | static DEFINE_SPINLOCK(nf_h323_lock); |
| 112 | static char *h323_buffer; |
| 113 | |
| 114 | static struct nf_conntrack_helper nf_conntrack_helper_h245; |
| 115 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; |
| 116 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; |
| 117 | |
| 118 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 119 | static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 120 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
| 121 | unsigned char **data, int *datalen, int *dataoff) |
| 122 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 123 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 124 | int dir = CTINFO2DIR(ctinfo); |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 125 | const struct tcphdr *th; |
| 126 | struct tcphdr _tcph; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 127 | int tcpdatalen; |
| 128 | int tcpdataoff; |
| 129 | unsigned char *tpkt; |
| 130 | int tpktlen; |
| 131 | int tpktoff; |
| 132 | |
| 133 | /* Get TCP header */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 134 | th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 135 | if (th == NULL) |
| 136 | return 0; |
| 137 | |
| 138 | /* Get TCP data offset */ |
| 139 | tcpdataoff = protoff + th->doff * 4; |
| 140 | |
| 141 | /* Get TCP data length */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 142 | tcpdatalen = skb->len - tcpdataoff; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 143 | if (tcpdatalen <= 0) /* No TCP data */ |
| 144 | goto clear_out; |
| 145 | |
| 146 | if (*data == NULL) { /* first TPKT */ |
| 147 | /* Get first TPKT pointer */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 148 | tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 149 | h323_buffer); |
| 150 | BUG_ON(tpkt == NULL); |
| 151 | |
| 152 | /* Validate TPKT identifier */ |
| 153 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { |
| 154 | /* Netmeeting sends TPKT header and data separately */ |
| 155 | if (info->tpkt_len[dir] > 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 156 | pr_debug("nf_ct_h323: previous packet " |
| 157 | "indicated separate TPKT data of %hu " |
| 158 | "bytes\n", info->tpkt_len[dir]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 159 | if (info->tpkt_len[dir] <= tcpdatalen) { |
| 160 | /* Yes, there was a TPKT header |
| 161 | * received */ |
| 162 | *data = tpkt; |
| 163 | *datalen = info->tpkt_len[dir]; |
| 164 | *dataoff = 0; |
| 165 | goto out; |
| 166 | } |
| 167 | |
| 168 | /* Fragmented TPKT */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 169 | pr_debug("nf_ct_h323: fragmented TPKT\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 170 | goto clear_out; |
| 171 | } |
| 172 | |
| 173 | /* It is not even a TPKT */ |
| 174 | return 0; |
| 175 | } |
| 176 | tpktoff = 0; |
| 177 | } else { /* Next TPKT */ |
| 178 | tpktoff = *dataoff + *datalen; |
| 179 | tcpdatalen -= tpktoff; |
| 180 | if (tcpdatalen <= 4) /* No more TPKT */ |
| 181 | goto clear_out; |
| 182 | tpkt = *data + *datalen; |
| 183 | |
| 184 | /* Validate TPKT identifier */ |
| 185 | if (tpkt[0] != 0x03 || tpkt[1] != 0) |
| 186 | goto clear_out; |
| 187 | } |
| 188 | |
| 189 | /* Validate TPKT length */ |
| 190 | tpktlen = tpkt[2] * 256 + tpkt[3]; |
| 191 | if (tpktlen < 4) |
| 192 | goto clear_out; |
| 193 | if (tpktlen > tcpdatalen) { |
| 194 | if (tcpdatalen == 4) { /* Separate TPKT header */ |
| 195 | /* Netmeeting sends TPKT header and data separately */ |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 196 | pr_debug("nf_ct_h323: separate TPKT header indicates " |
| 197 | "there will be TPKT data of %hu bytes\n", |
| 198 | tpktlen - 4); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 199 | info->tpkt_len[dir] = tpktlen - 4; |
| 200 | return 0; |
| 201 | } |
| 202 | |
Patrick McHardy | e772c34 | 2010-05-01 18:29:43 +0200 | [diff] [blame] | 203 | pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 204 | goto clear_out; |
| 205 | } |
| 206 | |
| 207 | /* This is the encapsulated data */ |
| 208 | *data = tpkt + 4; |
| 209 | *datalen = tpktlen - 4; |
| 210 | *dataoff = tpktoff + 4; |
| 211 | |
| 212 | out: |
| 213 | /* Clear TPKT length */ |
| 214 | info->tpkt_len[dir] = 0; |
| 215 | return 1; |
| 216 | |
| 217 | clear_out: |
| 218 | info->tpkt_len[dir] = 0; |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | /****************************************************************************/ |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 223 | 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] | 224 | H245_TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 225 | union nf_inet_addr *addr, __be16 *port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 226 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 227 | const unsigned char *p; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 228 | int len; |
| 229 | |
| 230 | if (taddr->choice != eH245_TransportAddress_unicastAddress) |
| 231 | return 0; |
| 232 | |
| 233 | switch (taddr->unicastAddress.choice) { |
| 234 | case eUnicastAddress_iPAddress: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 235 | if (nf_ct_l3num(ct) != AF_INET) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 236 | return 0; |
| 237 | p = data + taddr->unicastAddress.iPAddress.network; |
| 238 | len = 4; |
| 239 | break; |
| 240 | case eUnicastAddress_iP6Address: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 241 | if (nf_ct_l3num(ct) != AF_INET6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 242 | return 0; |
| 243 | p = data + taddr->unicastAddress.iP6Address.network; |
| 244 | len = 16; |
| 245 | break; |
| 246 | default: |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | memcpy(addr, p, len); |
| 251 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 252 | memcpy(port, p + len, sizeof(__be16)); |
| 253 | |
| 254 | return 1; |
| 255 | } |
| 256 | |
| 257 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 258 | 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] | 259 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 260 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 261 | unsigned char **data, int dataoff, |
| 262 | H245_TransportAddress *taddr) |
| 263 | { |
| 264 | int dir = CTINFO2DIR(ctinfo); |
| 265 | int ret = 0; |
| 266 | __be16 port; |
| 267 | __be16 rtp_port, rtcp_port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 268 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 269 | struct nf_conntrack_expect *rtp_exp; |
| 270 | struct nf_conntrack_expect *rtcp_exp; |
| 271 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; |
| 272 | |
| 273 | /* Read RTP or RTCP address */ |
| 274 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 275 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 276 | port == 0) |
| 277 | return 0; |
| 278 | |
| 279 | /* RTP port is even */ |
Pablo Neira Ayuso | d109e9a | 2012-06-04 13:31:04 +0200 | [diff] [blame] | 280 | rtp_port = port & ~htons(1); |
| 281 | rtcp_port = port | htons(1); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 282 | |
| 283 | /* Create expect for RTP */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 284 | if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 285 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 286 | 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] | 287 | &ct->tuplehash[!dir].tuple.src.u3, |
| 288 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 289 | IPPROTO_UDP, NULL, &rtp_port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 290 | |
| 291 | /* Create expect for RTCP */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 292 | if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { |
| 293 | nf_ct_expect_put(rtp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 294 | return -1; |
| 295 | } |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 296 | 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] | 297 | &ct->tuplehash[!dir].tuple.src.u3, |
| 298 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 299 | IPPROTO_UDP, NULL, &rtcp_port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 300 | |
| 301 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 302 | &ct->tuplehash[!dir].tuple.dst.u3, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 303 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 304 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 305 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 306 | ct->status & IPS_NAT_MASK) { |
| 307 | /* NAT needed */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 308 | ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 309 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
| 310 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 311 | if (nf_ct_expect_related(rtp_exp) == 0) { |
| 312 | if (nf_ct_expect_related(rtcp_exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 313 | pr_debug("nf_ct_h323: expect RTP "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 314 | nf_ct_dump_tuple(&rtp_exp->tuple); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 315 | pr_debug("nf_ct_h323: expect RTCP "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 316 | nf_ct_dump_tuple(&rtcp_exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 317 | } else { |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 318 | nf_ct_unexpect_related(rtp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 319 | ret = -1; |
| 320 | } |
| 321 | } else |
| 322 | ret = -1; |
| 323 | } |
| 324 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 325 | nf_ct_expect_put(rtp_exp); |
| 326 | nf_ct_expect_put(rtcp_exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 327 | |
| 328 | return ret; |
| 329 | } |
| 330 | |
| 331 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 332 | static int expect_t120(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 333 | struct nf_conn *ct, |
| 334 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 335 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 336 | unsigned char **data, int dataoff, |
| 337 | H245_TransportAddress *taddr) |
| 338 | { |
| 339 | int dir = CTINFO2DIR(ctinfo); |
| 340 | int ret = 0; |
| 341 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 342 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 343 | struct nf_conntrack_expect *exp; |
| 344 | typeof(nat_t120_hook) nat_t120; |
| 345 | |
| 346 | /* Read T.120 address */ |
| 347 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 348 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 349 | port == 0) |
| 350 | return 0; |
| 351 | |
| 352 | /* Create expect for T.120 connections */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 353 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 354 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 355 | 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] | 356 | &ct->tuplehash[!dir].tuple.src.u3, |
| 357 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 358 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 359 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
| 360 | |
| 361 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 362 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 363 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 364 | (nat_t120 = rcu_dereference(nat_t120_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 365 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 366 | ct->status & IPS_NAT_MASK) { |
| 367 | /* NAT needed */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 368 | ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 369 | port, exp); |
| 370 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 371 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 372 | pr_debug("nf_ct_h323: expect T.120 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 373 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 374 | } else |
| 375 | ret = -1; |
| 376 | } |
| 377 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 378 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 379 | |
| 380 | return ret; |
| 381 | } |
| 382 | |
| 383 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 384 | static int process_h245_channel(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 385 | struct nf_conn *ct, |
| 386 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 387 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 388 | unsigned char **data, int dataoff, |
| 389 | H2250LogicalChannelParameters *channel) |
| 390 | { |
| 391 | int ret; |
| 392 | |
| 393 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { |
| 394 | /* RTP */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 395 | ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 396 | &channel->mediaChannel); |
| 397 | if (ret < 0) |
| 398 | return -1; |
| 399 | } |
| 400 | |
| 401 | if (channel-> |
| 402 | options & eH2250LogicalChannelParameters_mediaControlChannel) { |
| 403 | /* RTCP */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 404 | ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 405 | &channel->mediaControlChannel); |
| 406 | if (ret < 0) |
| 407 | return -1; |
| 408 | } |
| 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 414 | static int process_olc(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 415 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 416 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 417 | unsigned char **data, int dataoff, |
| 418 | OpenLogicalChannel *olc) |
| 419 | { |
| 420 | int ret; |
| 421 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 422 | pr_debug("nf_ct_h323: OpenLogicalChannel\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 423 | |
| 424 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == |
| 425 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) |
| 426 | { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 427 | ret = process_h245_channel(skb, ct, ctinfo, |
| 428 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 429 | &olc-> |
| 430 | forwardLogicalChannelParameters. |
| 431 | multiplexParameters. |
| 432 | h2250LogicalChannelParameters); |
| 433 | if (ret < 0) |
| 434 | return -1; |
| 435 | } |
| 436 | |
| 437 | if ((olc->options & |
| 438 | eOpenLogicalChannel_reverseLogicalChannelParameters) && |
| 439 | (olc->reverseLogicalChannelParameters.options & |
| 440 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) |
| 441 | && (olc->reverseLogicalChannelParameters.multiplexParameters. |
| 442 | choice == |
| 443 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 444 | { |
| 445 | ret = |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 446 | process_h245_channel(skb, ct, ctinfo, |
| 447 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 448 | &olc-> |
| 449 | reverseLogicalChannelParameters. |
| 450 | multiplexParameters. |
| 451 | h2250LogicalChannelParameters); |
| 452 | if (ret < 0) |
| 453 | return -1; |
| 454 | } |
| 455 | |
| 456 | if ((olc->options & eOpenLogicalChannel_separateStack) && |
| 457 | olc->forwardLogicalChannelParameters.dataType.choice == |
| 458 | eDataType_data && |
| 459 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 460 | choice == eDataApplicationCapability_application_t120 && |
| 461 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 462 | t120.choice == eDataProtocolCapability_separateLANStack && |
| 463 | olc->separateStack.networkAddress.choice == |
| 464 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 465 | ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 466 | &olc->separateStack.networkAddress. |
| 467 | localAreaAddress); |
| 468 | if (ret < 0) |
| 469 | return -1; |
| 470 | } |
| 471 | |
| 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 476 | static int process_olca(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 477 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 478 | unsigned int protoff, unsigned char **data, int dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 479 | OpenLogicalChannelAck *olca) |
| 480 | { |
| 481 | H2250LogicalChannelAckParameters *ack; |
| 482 | int ret; |
| 483 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 484 | pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 485 | |
| 486 | if ((olca->options & |
| 487 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && |
| 488 | (olca->reverseLogicalChannelParameters.options & |
| 489 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) |
| 490 | && (olca->reverseLogicalChannelParameters.multiplexParameters. |
| 491 | choice == |
| 492 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 493 | { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 494 | ret = process_h245_channel(skb, ct, ctinfo, |
| 495 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 496 | &olca-> |
| 497 | reverseLogicalChannelParameters. |
| 498 | multiplexParameters. |
| 499 | h2250LogicalChannelParameters); |
| 500 | if (ret < 0) |
| 501 | return -1; |
| 502 | } |
| 503 | |
| 504 | if ((olca->options & |
| 505 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && |
| 506 | (olca->forwardMultiplexAckParameters.choice == |
| 507 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) |
| 508 | { |
| 509 | ack = &olca->forwardMultiplexAckParameters. |
| 510 | h2250LogicalChannelAckParameters; |
| 511 | if (ack->options & |
| 512 | eH2250LogicalChannelAckParameters_mediaChannel) { |
| 513 | /* RTP */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 514 | ret = expect_rtp_rtcp(skb, ct, ctinfo, |
| 515 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 516 | &ack->mediaChannel); |
| 517 | if (ret < 0) |
| 518 | return -1; |
| 519 | } |
| 520 | |
| 521 | if (ack->options & |
| 522 | eH2250LogicalChannelAckParameters_mediaControlChannel) { |
| 523 | /* RTCP */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 524 | ret = expect_rtp_rtcp(skb, ct, ctinfo, |
| 525 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 526 | &ack->mediaControlChannel); |
| 527 | if (ret < 0) |
| 528 | return -1; |
| 529 | } |
| 530 | } |
| 531 | |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 532 | if ((olca->options & eOpenLogicalChannelAck_separateStack) && |
| 533 | olca->separateStack.networkAddress.choice == |
| 534 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 535 | ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, |
Jing Min Zhao | f8f1c08 | 2007-05-24 16:44:11 -0700 | [diff] [blame] | 536 | &olca->separateStack.networkAddress. |
| 537 | localAreaAddress); |
| 538 | if (ret < 0) |
| 539 | return -1; |
| 540 | } |
| 541 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 546 | static int process_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 547 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 548 | unsigned int protoff, unsigned char **data, int dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 549 | MultimediaSystemControlMessage *mscm) |
| 550 | { |
| 551 | switch (mscm->choice) { |
| 552 | case eMultimediaSystemControlMessage_request: |
| 553 | if (mscm->request.choice == |
| 554 | eRequestMessage_openLogicalChannel) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 555 | return process_olc(skb, ct, ctinfo, |
| 556 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 557 | &mscm->request.openLogicalChannel); |
| 558 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 559 | pr_debug("nf_ct_h323: H.245 Request %d\n", |
| 560 | mscm->request.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 561 | break; |
| 562 | case eMultimediaSystemControlMessage_response: |
| 563 | if (mscm->response.choice == |
| 564 | eResponseMessage_openLogicalChannelAck) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 565 | return process_olca(skb, ct, ctinfo, |
| 566 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 567 | &mscm->response. |
| 568 | openLogicalChannelAck); |
| 569 | } |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 570 | pr_debug("nf_ct_h323: H.245 Response %d\n", |
| 571 | mscm->response.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 572 | break; |
| 573 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 574 | pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 575 | break; |
| 576 | } |
| 577 | |
| 578 | return 0; |
| 579 | } |
| 580 | |
| 581 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 582 | static int h245_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 583 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 584 | { |
| 585 | static MultimediaSystemControlMessage mscm; |
| 586 | unsigned char *data = NULL; |
| 587 | int datalen; |
| 588 | int dataoff; |
| 589 | int ret; |
| 590 | |
| 591 | /* Until there's been traffic both ways, don't look in packets. */ |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 592 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 593 | return NF_ACCEPT; |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 594 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 595 | pr_debug("nf_ct_h245: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 596 | |
| 597 | spin_lock_bh(&nf_h323_lock); |
| 598 | |
| 599 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 600 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 601 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 602 | pr_debug("nf_ct_h245: TPKT len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 603 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 604 | |
| 605 | /* Decode H.245 signal */ |
| 606 | ret = DecodeMultimediaSystemControlMessage(data, datalen, |
| 607 | &mscm); |
| 608 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 609 | pr_debug("nf_ct_h245: decoding error: %s\n", |
| 610 | ret == H323_ERROR_BOUND ? |
| 611 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 612 | /* We don't drop when decoding error */ |
| 613 | break; |
| 614 | } |
| 615 | |
| 616 | /* Process H.245 signal */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 617 | if (process_h245(skb, ct, ctinfo, protoff, |
| 618 | &data, dataoff, &mscm) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 619 | goto drop; |
| 620 | } |
| 621 | |
| 622 | spin_unlock_bh(&nf_h323_lock); |
| 623 | return NF_ACCEPT; |
| 624 | |
| 625 | drop: |
| 626 | spin_unlock_bh(&nf_h323_lock); |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 627 | nf_ct_helper_log(skb, ct, "cannot process H.245 message"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 628 | return NF_DROP; |
| 629 | } |
| 630 | |
| 631 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 632 | static const struct nf_conntrack_expect_policy h245_exp_policy = { |
| 633 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, |
| 634 | .timeout = 240, |
| 635 | }; |
| 636 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 637 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
| 638 | .name = "H.245", |
| 639 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 640 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 641 | .tuple.src.l3num = AF_UNSPEC, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 642 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 643 | .help = h245_help, |
| 644 | .expect_policy = &h245_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 645 | }; |
| 646 | |
| 647 | /****************************************************************************/ |
| 648 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, |
| 649 | TransportAddress *taddr, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 650 | union nf_inet_addr *addr, __be16 *port) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 651 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 652 | const unsigned char *p; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 653 | int len; |
| 654 | |
| 655 | switch (taddr->choice) { |
| 656 | case eTransportAddress_ipAddress: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 657 | if (nf_ct_l3num(ct) != AF_INET) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 658 | return 0; |
| 659 | p = data + taddr->ipAddress.ip; |
| 660 | len = 4; |
| 661 | break; |
| 662 | case eTransportAddress_ip6Address: |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 663 | if (nf_ct_l3num(ct) != AF_INET6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 664 | return 0; |
Jing Min Zhao | bb80724 | 2007-05-24 16:43:07 -0700 | [diff] [blame] | 665 | p = data + taddr->ip6Address.ip; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 666 | len = 16; |
| 667 | break; |
| 668 | default: |
| 669 | return 0; |
| 670 | } |
| 671 | |
| 672 | memcpy(addr, p, len); |
| 673 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 674 | memcpy(port, p + len, sizeof(__be16)); |
| 675 | |
| 676 | return 1; |
| 677 | } |
| 678 | |
| 679 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 680 | static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 681 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 682 | unsigned int protoff, unsigned char **data, int dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 683 | TransportAddress *taddr) |
| 684 | { |
| 685 | int dir = CTINFO2DIR(ctinfo); |
| 686 | int ret = 0; |
| 687 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 688 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 689 | struct nf_conntrack_expect *exp; |
| 690 | typeof(nat_h245_hook) nat_h245; |
| 691 | |
| 692 | /* Read h245Address */ |
| 693 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || |
| 694 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 695 | port == 0) |
| 696 | return 0; |
| 697 | |
| 698 | /* Create expect for h245 connection */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 699 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 700 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 701 | 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] | 702 | &ct->tuplehash[!dir].tuple.src.u3, |
| 703 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 704 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 705 | exp->helper = &nf_conntrack_helper_h245; |
| 706 | |
| 707 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 708 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 709 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 710 | (nat_h245 = rcu_dereference(nat_h245_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 711 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 712 | ct->status & IPS_NAT_MASK) { |
| 713 | /* NAT needed */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 714 | ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 715 | port, exp); |
| 716 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 717 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 718 | pr_debug("nf_ct_q931: expect H.245 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 719 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 720 | } else |
| 721 | ret = -1; |
| 722 | } |
| 723 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 724 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 725 | |
| 726 | return ret; |
| 727 | } |
| 728 | |
| 729 | /* If the calling party is on the same side of the forward-to party, |
| 730 | * we don't need to track the second call */ |
Vasily Averin | 2c7b5d5 | 2014-11-13 14:31:25 +0300 | [diff] [blame] | 731 | static int callforward_do_filter(struct net *net, |
| 732 | const union nf_inet_addr *src, |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 733 | const union nf_inet_addr *dst, |
| 734 | u_int8_t family) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 735 | { |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 736 | const struct nf_afinfo *afinfo; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 737 | int ret = 0; |
| 738 | |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 739 | /* rcu_read_lock()ed by nf_hook_slow() */ |
| 740 | afinfo = nf_get_afinfo(family); |
| 741 | if (!afinfo) |
| 742 | return 0; |
| 743 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 744 | switch (family) { |
| 745 | case AF_INET: { |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 746 | struct flowi4 fl1, fl2; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 747 | struct rtable *rt1, *rt2; |
| 748 | |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 749 | memset(&fl1, 0, sizeof(fl1)); |
| 750 | fl1.daddr = src->ip; |
| 751 | |
| 752 | memset(&fl2, 0, sizeof(fl2)); |
| 753 | fl2.daddr = dst->ip; |
Vasily Averin | 2c7b5d5 | 2014-11-13 14:31:25 +0300 | [diff] [blame] | 754 | if (!afinfo->route(net, (struct dst_entry **)&rt1, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 755 | flowi4_to_flowi(&fl1), false)) { |
Vasily Averin | 2c7b5d5 | 2014-11-13 14:31:25 +0300 | [diff] [blame] | 756 | if (!afinfo->route(net, (struct dst_entry **)&rt2, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 757 | flowi4_to_flowi(&fl2), false)) { |
Julian Anastasov | bbb5823 | 2012-10-09 13:00:47 +0000 | [diff] [blame] | 758 | if (rt_nexthop(rt1, fl1.daddr) == |
| 759 | rt_nexthop(rt2, fl2.daddr) && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 760 | rt1->dst.dev == rt2->dst.dev) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 761 | ret = 1; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 762 | dst_release(&rt2->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 763 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 764 | dst_release(&rt1->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 765 | } |
| 766 | break; |
| 767 | } |
Igor Maravić | c0cd115 | 2011-12-12 02:58:24 +0000 | [diff] [blame] | 768 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 769 | case AF_INET6: { |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 770 | struct flowi6 fl1, fl2; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 771 | struct rt6_info *rt1, *rt2; |
| 772 | |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 773 | memset(&fl1, 0, sizeof(fl1)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 774 | fl1.daddr = src->in6; |
David S. Miller | 5a49d0e | 2011-03-12 02:14:05 -0500 | [diff] [blame] | 775 | |
| 776 | memset(&fl2, 0, sizeof(fl2)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 777 | fl2.daddr = dst->in6; |
Vasily Averin | 2c7b5d5 | 2014-11-13 14:31:25 +0300 | [diff] [blame] | 778 | if (!afinfo->route(net, (struct dst_entry **)&rt1, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 779 | flowi6_to_flowi(&fl1), false)) { |
Vasily Averin | 2c7b5d5 | 2014-11-13 14:31:25 +0300 | [diff] [blame] | 780 | if (!afinfo->route(net, (struct dst_entry **)&rt2, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 781 | flowi6_to_flowi(&fl2), false)) { |
Martin KaFai Lau | 2647a9b | 2015-05-22 20:55:58 -0700 | [diff] [blame] | 782 | if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr), |
| 783 | rt6_nexthop(rt2, &fl2.daddr)) && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 784 | rt1->dst.dev == rt2->dst.dev) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 785 | ret = 1; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 786 | dst_release(&rt2->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 787 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 788 | dst_release(&rt1->dst); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 789 | } |
| 790 | break; |
| 791 | } |
| 792 | #endif |
| 793 | } |
| 794 | return ret; |
| 795 | |
| 796 | } |
| 797 | |
| 798 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 799 | static int expect_callforwarding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 800 | struct nf_conn *ct, |
| 801 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 802 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 803 | unsigned char **data, int dataoff, |
| 804 | TransportAddress *taddr) |
| 805 | { |
| 806 | int dir = CTINFO2DIR(ctinfo); |
| 807 | int ret = 0; |
| 808 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 809 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 810 | struct nf_conntrack_expect *exp; |
Vasily Averin | 2c7b5d5 | 2014-11-13 14:31:25 +0300 | [diff] [blame] | 811 | struct net *net = nf_ct_net(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 812 | typeof(nat_callforwarding_hook) nat_callforwarding; |
| 813 | |
| 814 | /* Read alternativeAddress */ |
| 815 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) |
| 816 | return 0; |
| 817 | |
| 818 | /* If the calling party is on the same side of the forward-to party, |
| 819 | * we don't need to track the second call */ |
| 820 | if (callforward_filter && |
Vasily Averin | 2c7b5d5 | 2014-11-13 14:31:25 +0300 | [diff] [blame] | 821 | callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3, |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 822 | nf_ct_l3num(ct))) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 823 | pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 824 | return 0; |
| 825 | } |
| 826 | |
| 827 | /* Create expect for the second call leg */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 828 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 829 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 830 | 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] | 831 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 832 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 833 | exp->helper = nf_conntrack_helper_q931; |
| 834 | |
| 835 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 836 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 837 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 838 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 839 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 840 | ct->status & IPS_NAT_MASK) { |
| 841 | /* Need NAT */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 842 | ret = nat_callforwarding(skb, ct, ctinfo, |
| 843 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 844 | taddr, port, exp); |
| 845 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 846 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 847 | pr_debug("nf_ct_q931: expect Call Forwarding "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 848 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 849 | } else |
| 850 | ret = -1; |
| 851 | } |
| 852 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 853 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 854 | |
| 855 | return ret; |
| 856 | } |
| 857 | |
| 858 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 859 | static int process_setup(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 860 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 861 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 862 | unsigned char **data, int dataoff, |
| 863 | Setup_UUIE *setup) |
| 864 | { |
| 865 | int dir = CTINFO2DIR(ctinfo); |
| 866 | int ret; |
| 867 | int i; |
| 868 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 869 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 870 | typeof(set_h225_addr_hook) set_h225_addr; |
| 871 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 872 | pr_debug("nf_ct_q931: Setup\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 873 | |
| 874 | if (setup->options & eSetup_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 875 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 876 | &setup->h245Address); |
| 877 | if (ret < 0) |
| 878 | return -1; |
| 879 | } |
| 880 | |
| 881 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 882 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 883 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 884 | ct->status & IPS_NAT_MASK && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 885 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 886 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 887 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 888 | pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 889 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 890 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 891 | ret = set_h225_addr(skb, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 892 | &setup->destCallSignalAddress, |
| 893 | &ct->tuplehash[!dir].tuple.src.u3, |
| 894 | ct->tuplehash[!dir].tuple.src.u.tcp.port); |
| 895 | if (ret < 0) |
| 896 | return -1; |
| 897 | } |
| 898 | |
| 899 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 900 | (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 901 | ct->status & IPS_NAT_MASK && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 902 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 903 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 904 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 905 | pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", |
Harvey Harrison | 38ff4fa | 2008-10-28 16:08:13 -0700 | [diff] [blame] | 906 | &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 907 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 908 | ret = set_h225_addr(skb, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 909 | &setup->sourceCallSignalAddress, |
| 910 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 911 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); |
| 912 | if (ret < 0) |
| 913 | return -1; |
| 914 | } |
| 915 | |
| 916 | if (setup->options & eSetup_UUIE_fastStart) { |
| 917 | for (i = 0; i < setup->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 918 | ret = process_olc(skb, ct, ctinfo, |
| 919 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 920 | &setup->fastStart.item[i]); |
| 921 | if (ret < 0) |
| 922 | return -1; |
| 923 | } |
| 924 | } |
| 925 | |
| 926 | return 0; |
| 927 | } |
| 928 | |
| 929 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 930 | static int process_callproceeding(struct sk_buff *skb, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 931 | struct nf_conn *ct, |
| 932 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 933 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 934 | unsigned char **data, int dataoff, |
| 935 | CallProceeding_UUIE *callproc) |
| 936 | { |
| 937 | int ret; |
| 938 | int i; |
| 939 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 940 | pr_debug("nf_ct_q931: CallProceeding\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 941 | |
| 942 | if (callproc->options & eCallProceeding_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 943 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 944 | &callproc->h245Address); |
| 945 | if (ret < 0) |
| 946 | return -1; |
| 947 | } |
| 948 | |
| 949 | if (callproc->options & eCallProceeding_UUIE_fastStart) { |
| 950 | for (i = 0; i < callproc->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 951 | ret = process_olc(skb, ct, ctinfo, |
| 952 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 953 | &callproc->fastStart.item[i]); |
| 954 | if (ret < 0) |
| 955 | return -1; |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | return 0; |
| 960 | } |
| 961 | |
| 962 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 963 | static int process_connect(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 964 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 965 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 966 | unsigned char **data, int dataoff, |
| 967 | Connect_UUIE *connect) |
| 968 | { |
| 969 | int ret; |
| 970 | int i; |
| 971 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 972 | pr_debug("nf_ct_q931: Connect\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 973 | |
| 974 | if (connect->options & eConnect_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 975 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 976 | &connect->h245Address); |
| 977 | if (ret < 0) |
| 978 | return -1; |
| 979 | } |
| 980 | |
| 981 | if (connect->options & eConnect_UUIE_fastStart) { |
| 982 | for (i = 0; i < connect->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 983 | ret = process_olc(skb, ct, ctinfo, |
| 984 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 985 | &connect->fastStart.item[i]); |
| 986 | if (ret < 0) |
| 987 | return -1; |
| 988 | } |
| 989 | } |
| 990 | |
| 991 | return 0; |
| 992 | } |
| 993 | |
| 994 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 995 | static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 996 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 997 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 998 | unsigned char **data, int dataoff, |
| 999 | Alerting_UUIE *alert) |
| 1000 | { |
| 1001 | int ret; |
| 1002 | int i; |
| 1003 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1004 | pr_debug("nf_ct_q931: Alerting\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1005 | |
| 1006 | if (alert->options & eAlerting_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1007 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1008 | &alert->h245Address); |
| 1009 | if (ret < 0) |
| 1010 | return -1; |
| 1011 | } |
| 1012 | |
| 1013 | if (alert->options & eAlerting_UUIE_fastStart) { |
| 1014 | for (i = 0; i < alert->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1015 | ret = process_olc(skb, ct, ctinfo, |
| 1016 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1017 | &alert->fastStart.item[i]); |
| 1018 | if (ret < 0) |
| 1019 | return -1; |
| 1020 | } |
| 1021 | } |
| 1022 | |
| 1023 | return 0; |
| 1024 | } |
| 1025 | |
| 1026 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1027 | static int process_facility(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1028 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1029 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1030 | unsigned char **data, int dataoff, |
| 1031 | Facility_UUIE *facility) |
| 1032 | { |
| 1033 | int ret; |
| 1034 | int i; |
| 1035 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1036 | pr_debug("nf_ct_q931: Facility\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1037 | |
| 1038 | if (facility->reason.choice == eFacilityReason_callForwarded) { |
| 1039 | if (facility->options & eFacility_UUIE_alternativeAddress) |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1040 | return expect_callforwarding(skb, ct, ctinfo, |
| 1041 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1042 | &facility-> |
| 1043 | alternativeAddress); |
| 1044 | return 0; |
| 1045 | } |
| 1046 | |
| 1047 | if (facility->options & eFacility_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1048 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1049 | &facility->h245Address); |
| 1050 | if (ret < 0) |
| 1051 | return -1; |
| 1052 | } |
| 1053 | |
| 1054 | if (facility->options & eFacility_UUIE_fastStart) { |
| 1055 | for (i = 0; i < facility->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1056 | ret = process_olc(skb, ct, ctinfo, |
| 1057 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1058 | &facility->fastStart.item[i]); |
| 1059 | if (ret < 0) |
| 1060 | return -1; |
| 1061 | } |
| 1062 | } |
| 1063 | |
| 1064 | return 0; |
| 1065 | } |
| 1066 | |
| 1067 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1068 | static int process_progress(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1069 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1070 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1071 | unsigned char **data, int dataoff, |
| 1072 | Progress_UUIE *progress) |
| 1073 | { |
| 1074 | int ret; |
| 1075 | int i; |
| 1076 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1077 | pr_debug("nf_ct_q931: Progress\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1078 | |
| 1079 | if (progress->options & eProgress_UUIE_h245Address) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1080 | ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1081 | &progress->h245Address); |
| 1082 | if (ret < 0) |
| 1083 | return -1; |
| 1084 | } |
| 1085 | |
| 1086 | if (progress->options & eProgress_UUIE_fastStart) { |
| 1087 | for (i = 0; i < progress->fastStart.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1088 | ret = process_olc(skb, ct, ctinfo, |
| 1089 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1090 | &progress->fastStart.item[i]); |
| 1091 | if (ret < 0) |
| 1092 | return -1; |
| 1093 | } |
| 1094 | } |
| 1095 | |
| 1096 | return 0; |
| 1097 | } |
| 1098 | |
| 1099 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1100 | static int process_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1101 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1102 | unsigned int protoff, unsigned char **data, int dataoff, |
| 1103 | Q931 *q931) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1104 | { |
| 1105 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; |
| 1106 | int i; |
| 1107 | int ret = 0; |
| 1108 | |
| 1109 | switch (pdu->h323_message_body.choice) { |
| 1110 | case eH323_UU_PDU_h323_message_body_setup: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1111 | ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1112 | &pdu->h323_message_body.setup); |
| 1113 | break; |
| 1114 | case eH323_UU_PDU_h323_message_body_callProceeding: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1115 | ret = process_callproceeding(skb, ct, ctinfo, |
| 1116 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1117 | &pdu->h323_message_body. |
| 1118 | callProceeding); |
| 1119 | break; |
| 1120 | case eH323_UU_PDU_h323_message_body_connect: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1121 | ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1122 | &pdu->h323_message_body.connect); |
| 1123 | break; |
| 1124 | case eH323_UU_PDU_h323_message_body_alerting: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1125 | ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1126 | &pdu->h323_message_body.alerting); |
| 1127 | break; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1128 | case eH323_UU_PDU_h323_message_body_facility: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1129 | ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1130 | &pdu->h323_message_body.facility); |
| 1131 | break; |
| 1132 | case eH323_UU_PDU_h323_message_body_progress: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1133 | ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1134 | &pdu->h323_message_body.progress); |
| 1135 | break; |
| 1136 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1137 | pr_debug("nf_ct_q931: Q.931 signal %d\n", |
| 1138 | pdu->h323_message_body.choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1139 | break; |
| 1140 | } |
| 1141 | |
| 1142 | if (ret < 0) |
| 1143 | return -1; |
| 1144 | |
| 1145 | if (pdu->options & eH323_UU_PDU_h245Control) { |
| 1146 | for (i = 0; i < pdu->h245Control.count; i++) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1147 | ret = process_h245(skb, ct, ctinfo, |
| 1148 | protoff, data, dataoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1149 | &pdu->h245Control.item[i]); |
| 1150 | if (ret < 0) |
| 1151 | return -1; |
| 1152 | } |
| 1153 | } |
| 1154 | |
| 1155 | return 0; |
| 1156 | } |
| 1157 | |
| 1158 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1159 | static int q931_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1160 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1161 | { |
| 1162 | static Q931 q931; |
| 1163 | unsigned char *data = NULL; |
| 1164 | int datalen; |
| 1165 | int dataoff; |
| 1166 | int ret; |
| 1167 | |
| 1168 | /* Until there's been traffic both ways, don't look in packets. */ |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1169 | if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1170 | return NF_ACCEPT; |
Eric Dumazet | fb04883 | 2011-05-19 15:44:27 +0200 | [diff] [blame] | 1171 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1172 | pr_debug("nf_ct_q931: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1173 | |
| 1174 | spin_lock_bh(&nf_h323_lock); |
| 1175 | |
| 1176 | /* Process each TPKT */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1177 | while (get_tpkt_data(skb, protoff, ct, ctinfo, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1178 | &data, &datalen, &dataoff)) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1179 | pr_debug("nf_ct_q931: TPKT len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1180 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1181 | |
| 1182 | /* Decode Q.931 signal */ |
| 1183 | ret = DecodeQ931(data, datalen, &q931); |
| 1184 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1185 | pr_debug("nf_ct_q931: decoding error: %s\n", |
| 1186 | ret == H323_ERROR_BOUND ? |
| 1187 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1188 | /* We don't drop when decoding error */ |
| 1189 | break; |
| 1190 | } |
| 1191 | |
| 1192 | /* Process Q.931 signal */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1193 | if (process_q931(skb, ct, ctinfo, protoff, |
| 1194 | &data, dataoff, &q931) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1195 | goto drop; |
| 1196 | } |
| 1197 | |
| 1198 | spin_unlock_bh(&nf_h323_lock); |
| 1199 | return NF_ACCEPT; |
| 1200 | |
| 1201 | drop: |
| 1202 | spin_unlock_bh(&nf_h323_lock); |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 1203 | nf_ct_helper_log(skb, ct, "cannot process Q.931 message"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1204 | return NF_DROP; |
| 1205 | } |
| 1206 | |
| 1207 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1208 | static const struct nf_conntrack_expect_policy q931_exp_policy = { |
| 1209 | /* T.120 and H.245 */ |
| 1210 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, |
| 1211 | .timeout = 240, |
| 1212 | }; |
| 1213 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1214 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
| 1215 | { |
| 1216 | .name = "Q.931", |
| 1217 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1218 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1219 | .tuple.src.l3num = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1220 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1221 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1222 | .help = q931_help, |
| 1223 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1224 | }, |
| 1225 | { |
| 1226 | .name = "Q.931", |
| 1227 | .me = THIS_MODULE, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1228 | .tuple.src.l3num = AF_INET6, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1229 | .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1230 | .tuple.dst.protonum = IPPROTO_TCP, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1231 | .help = q931_help, |
| 1232 | .expect_policy = &q931_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1233 | }, |
| 1234 | }; |
| 1235 | |
| 1236 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1237 | 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] | 1238 | int *datalen) |
| 1239 | { |
Jan Engelhardt | 905e3e8 | 2008-01-31 04:50:05 -0800 | [diff] [blame] | 1240 | const struct udphdr *uh; |
| 1241 | struct udphdr _uh; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1242 | int dataoff; |
| 1243 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1244 | uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1245 | if (uh == NULL) |
| 1246 | return NULL; |
| 1247 | dataoff = protoff + sizeof(_uh); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1248 | if (dataoff >= skb->len) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1249 | return NULL; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1250 | *datalen = skb->len - dataoff; |
| 1251 | return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1252 | } |
| 1253 | |
| 1254 | /****************************************************************************/ |
| 1255 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1256 | union nf_inet_addr *addr, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1257 | __be16 port) |
| 1258 | { |
Alexey Dobriyan | 84541cc | 2008-10-08 11:35:09 +0200 | [diff] [blame] | 1259 | struct net *net = nf_ct_net(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1260 | struct nf_conntrack_expect *exp; |
| 1261 | struct nf_conntrack_tuple tuple; |
| 1262 | |
| 1263 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); |
| 1264 | tuple.src.u.tcp.port = 0; |
| 1265 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); |
| 1266 | tuple.dst.u.tcp.port = port; |
| 1267 | tuple.dst.protonum = IPPROTO_TCP; |
| 1268 | |
Patrick McHardy | 5d0aa2c | 2010-02-15 18:13:33 +0100 | [diff] [blame] | 1269 | exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1270 | if (exp && exp->master == ct) |
| 1271 | return exp; |
| 1272 | return NULL; |
| 1273 | } |
| 1274 | |
| 1275 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1276 | static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1277 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1278 | unsigned int protoff, unsigned char **data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1279 | TransportAddress *taddr, int count) |
| 1280 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1281 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1282 | int dir = CTINFO2DIR(ctinfo); |
| 1283 | int ret = 0; |
| 1284 | int i; |
| 1285 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1286 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1287 | struct nf_conntrack_expect *exp; |
| 1288 | typeof(nat_q931_hook) nat_q931; |
| 1289 | |
| 1290 | /* Look for the first related address */ |
| 1291 | for (i = 0; i < count; i++) { |
| 1292 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && |
| 1293 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1294 | sizeof(addr)) == 0 && port != 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1295 | break; |
| 1296 | } |
| 1297 | |
| 1298 | if (i >= count) /* Not found */ |
| 1299 | return 0; |
| 1300 | |
| 1301 | /* Create expect for Q.931 */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1302 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1303 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1304 | 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] | 1305 | gkrouted_only ? /* only accept calls from GK? */ |
| 1306 | &ct->tuplehash[!dir].tuple.src.u3 : NULL, |
| 1307 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1308 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1309 | exp->helper = nf_conntrack_helper_q931; |
| 1310 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ |
| 1311 | |
| 1312 | nat_q931 = rcu_dereference(nat_q931_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1313 | if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1314 | ct->status & IPS_NAT_MASK) { /* Need NAT */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1315 | ret = nat_q931(skb, ct, ctinfo, protoff, data, |
| 1316 | taddr, i, port, exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1317 | } else { /* Conntrack only */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1318 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1319 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1320 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1321 | |
| 1322 | /* Save port for looking up expect in processing RCF */ |
| 1323 | info->sig_port[dir] = port; |
| 1324 | } else |
| 1325 | ret = -1; |
| 1326 | } |
| 1327 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1328 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1329 | |
| 1330 | return ret; |
| 1331 | } |
| 1332 | |
| 1333 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1334 | static int process_grq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1335 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1336 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1337 | unsigned char **data, GatekeeperRequest *grq) |
| 1338 | { |
| 1339 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1340 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1341 | pr_debug("nf_ct_ras: GRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1342 | |
| 1343 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1344 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1345 | ct->status & IPS_NAT_MASK) /* NATed */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1346 | return set_ras_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1347 | &grq->rasAddress, 1); |
| 1348 | return 0; |
| 1349 | } |
| 1350 | |
| 1351 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1352 | static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1353 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1354 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1355 | unsigned char **data, GatekeeperConfirm *gcf) |
| 1356 | { |
| 1357 | int dir = CTINFO2DIR(ctinfo); |
| 1358 | int ret = 0; |
| 1359 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1360 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1361 | struct nf_conntrack_expect *exp; |
| 1362 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1363 | pr_debug("nf_ct_ras: GCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1364 | |
| 1365 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) |
| 1366 | return 0; |
| 1367 | |
| 1368 | /* Registration port is the same as discovery port */ |
| 1369 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1370 | port == ct->tuplehash[dir].tuple.src.u.udp.port) |
| 1371 | return 0; |
| 1372 | |
| 1373 | /* Avoid RAS expectation loops. A GCF is never expected. */ |
| 1374 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
| 1375 | return 0; |
| 1376 | |
| 1377 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1378 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1379 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1380 | 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] | 1381 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1382 | IPPROTO_UDP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1383 | exp->helper = nf_conntrack_helper_ras; |
| 1384 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1385 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1386 | pr_debug("nf_ct_ras: expect RAS "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1387 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1388 | } else |
| 1389 | ret = -1; |
| 1390 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1391 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1392 | |
| 1393 | return ret; |
| 1394 | } |
| 1395 | |
| 1396 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1397 | static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1398 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1399 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1400 | unsigned char **data, RegistrationRequest *rrq) |
| 1401 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1402 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1403 | int ret; |
| 1404 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1405 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1406 | pr_debug("nf_ct_ras: RRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1407 | |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1408 | ret = expect_q931(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1409 | rrq->callSignalAddress.item, |
| 1410 | rrq->callSignalAddress.count); |
| 1411 | if (ret < 0) |
| 1412 | return -1; |
| 1413 | |
| 1414 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1415 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1416 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1417 | ret = set_ras_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1418 | rrq->rasAddress.item, |
| 1419 | rrq->rasAddress.count); |
| 1420 | if (ret < 0) |
| 1421 | return -1; |
| 1422 | } |
| 1423 | |
| 1424 | if (rrq->options & eRegistrationRequest_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1425 | pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1426 | info->timeout = rrq->timeToLive; |
| 1427 | } else |
| 1428 | info->timeout = default_rrq_ttl; |
| 1429 | |
| 1430 | return 0; |
| 1431 | } |
| 1432 | |
| 1433 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1434 | static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1435 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1436 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1437 | unsigned char **data, RegistrationConfirm *rcf) |
| 1438 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1439 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1440 | int dir = CTINFO2DIR(ctinfo); |
| 1441 | int ret; |
| 1442 | struct nf_conntrack_expect *exp; |
| 1443 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1444 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1445 | pr_debug("nf_ct_ras: RCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1446 | |
| 1447 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1448 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1449 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1450 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1451 | rcf->callSignalAddress.item, |
| 1452 | rcf->callSignalAddress.count); |
| 1453 | if (ret < 0) |
| 1454 | return -1; |
| 1455 | } |
| 1456 | |
| 1457 | if (rcf->options & eRegistrationConfirm_timeToLive) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1458 | pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1459 | info->timeout = rcf->timeToLive; |
| 1460 | } |
| 1461 | |
| 1462 | if (info->timeout > 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1463 | pr_debug("nf_ct_ras: set RAS connection timeout to " |
| 1464 | "%u seconds\n", info->timeout); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1465 | nf_ct_refresh(ct, skb, info->timeout * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1466 | |
| 1467 | /* Set expect timeout */ |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1468 | spin_lock_bh(&nf_conntrack_expect_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1469 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
| 1470 | info->sig_port[!dir]); |
| 1471 | if (exp) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1472 | pr_debug("nf_ct_ras: set Q.931 expect " |
| 1473 | "timeout to %u seconds for", |
| 1474 | info->timeout); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1475 | nf_ct_dump_tuple(&exp->tuple); |
Gao Feng | 96d1327 | 2016-07-22 12:59:15 +0800 | [diff] [blame] | 1476 | mod_timer(&exp->timeout, jiffies + info->timeout * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1477 | } |
Jesper Dangaard Brouer | ca7433d | 2014-03-03 14:46:01 +0100 | [diff] [blame] | 1478 | spin_unlock_bh(&nf_conntrack_expect_lock); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1479 | } |
| 1480 | |
| 1481 | return 0; |
| 1482 | } |
| 1483 | |
| 1484 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1485 | static int process_urq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1486 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1487 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1488 | unsigned char **data, UnregistrationRequest *urq) |
| 1489 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1490 | struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1491 | int dir = CTINFO2DIR(ctinfo); |
| 1492 | int ret; |
| 1493 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1494 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1495 | pr_debug("nf_ct_ras: URQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1496 | |
| 1497 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1498 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1499 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1500 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1501 | urq->callSignalAddress.item, |
| 1502 | urq->callSignalAddress.count); |
| 1503 | if (ret < 0) |
| 1504 | return -1; |
| 1505 | } |
| 1506 | |
| 1507 | /* Clear old expect */ |
| 1508 | nf_ct_remove_expectations(ct); |
| 1509 | info->sig_port[dir] = 0; |
| 1510 | info->sig_port[!dir] = 0; |
| 1511 | |
| 1512 | /* Give it 30 seconds for UCF or URJ */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1513 | nf_ct_refresh(ct, skb, 30 * HZ); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1514 | |
| 1515 | return 0; |
| 1516 | } |
| 1517 | |
| 1518 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1519 | static int process_arq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1520 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1521 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1522 | unsigned char **data, AdmissionRequest *arq) |
| 1523 | { |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1524 | const struct nf_ct_h323_master *info = nfct_help_data(ct); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1525 | int dir = CTINFO2DIR(ctinfo); |
| 1526 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1527 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1528 | typeof(set_h225_addr_hook) set_h225_addr; |
| 1529 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1530 | pr_debug("nf_ct_ras: ARQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1531 | |
| 1532 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 1533 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && |
| 1534 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1535 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1536 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1537 | port == info->sig_port[dir] && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1538 | nf_ct_l3num(ct) == NFPROTO_IPV4 && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1539 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
| 1540 | /* Answering ARQ */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1541 | return set_h225_addr(skb, protoff, data, 0, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1542 | &arq->destCallSignalAddress, |
| 1543 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1544 | info->sig_port[!dir]); |
| 1545 | } |
| 1546 | |
| 1547 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && |
| 1548 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 1549 | &addr, &port) && |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1550 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1551 | set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1552 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1553 | /* Calling ARQ */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1554 | return set_h225_addr(skb, protoff, data, 0, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1555 | &arq->srcCallSignalAddress, |
| 1556 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1557 | port); |
| 1558 | } |
| 1559 | |
| 1560 | return 0; |
| 1561 | } |
| 1562 | |
| 1563 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1564 | static int process_acf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1565 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1566 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1567 | unsigned char **data, AdmissionConfirm *acf) |
| 1568 | { |
| 1569 | int dir = CTINFO2DIR(ctinfo); |
| 1570 | int ret = 0; |
| 1571 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1572 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1573 | struct nf_conntrack_expect *exp; |
| 1574 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1575 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1576 | pr_debug("nf_ct_ras: ACF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1577 | |
| 1578 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, |
| 1579 | &addr, &port)) |
| 1580 | return 0; |
| 1581 | |
| 1582 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { |
| 1583 | /* Answering ACF */ |
| 1584 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1585 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1586 | ct->status & IPS_NAT_MASK) |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1587 | return set_sig_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1588 | &acf->destCallSignalAddress, 1); |
| 1589 | return 0; |
| 1590 | } |
| 1591 | |
| 1592 | /* Need new expect */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1593 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1594 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1595 | 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] | 1596 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1597 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1598 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1599 | exp->helper = nf_conntrack_helper_q931; |
| 1600 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1601 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1602 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1603 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1604 | } else |
| 1605 | ret = -1; |
| 1606 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1607 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1608 | |
| 1609 | return ret; |
| 1610 | } |
| 1611 | |
| 1612 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1613 | static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1614 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1615 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1616 | unsigned char **data, LocationRequest *lrq) |
| 1617 | { |
| 1618 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1619 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1620 | pr_debug("nf_ct_ras: LRQ\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1621 | |
| 1622 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1623 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1624 | ct->status & IPS_NAT_MASK) |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1625 | return set_ras_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1626 | &lrq->replyAddress, 1); |
| 1627 | return 0; |
| 1628 | } |
| 1629 | |
| 1630 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1631 | static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1632 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1633 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1634 | unsigned char **data, LocationConfirm *lcf) |
| 1635 | { |
| 1636 | int dir = CTINFO2DIR(ctinfo); |
| 1637 | int ret = 0; |
| 1638 | __be16 port; |
Jan Engelhardt | 643a2c1 | 2007-12-17 22:43:50 -0800 | [diff] [blame] | 1639 | union nf_inet_addr addr; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1640 | struct nf_conntrack_expect *exp; |
| 1641 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1642 | pr_debug("nf_ct_ras: LCF\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1643 | |
| 1644 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, |
| 1645 | &addr, &port)) |
| 1646 | return 0; |
| 1647 | |
| 1648 | /* Need new expect for call signal */ |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1649 | if ((exp = nf_ct_expect_alloc(ct)) == NULL) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1650 | return -1; |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 1651 | 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] | 1652 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1653 | IPPROTO_TCP, NULL, &port); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1654 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1655 | exp->helper = nf_conntrack_helper_q931; |
| 1656 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1657 | if (nf_ct_expect_related(exp) == 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1658 | pr_debug("nf_ct_ras: expect Q.931 "); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1659 | nf_ct_dump_tuple(&exp->tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1660 | } else |
| 1661 | ret = -1; |
| 1662 | |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 1663 | nf_ct_expect_put(exp); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1664 | |
| 1665 | /* Ignore rasAddress */ |
| 1666 | |
| 1667 | return ret; |
| 1668 | } |
| 1669 | |
| 1670 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1671 | static int process_irr(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1672 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1673 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1674 | unsigned char **data, InfoRequestResponse *irr) |
| 1675 | { |
| 1676 | int ret; |
| 1677 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1678 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1679 | |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1680 | pr_debug("nf_ct_ras: IRR\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1681 | |
| 1682 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1683 | if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1684 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1685 | ret = set_ras_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1686 | &irr->rasAddress, 1); |
| 1687 | if (ret < 0) |
| 1688 | return -1; |
| 1689 | } |
| 1690 | |
| 1691 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
Patrick McHardy | 811927c | 2012-08-26 19:14:01 +0200 | [diff] [blame] | 1692 | if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && |
| 1693 | ct->status & IPS_NAT_MASK) { |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1694 | ret = set_sig_addr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1695 | irr->callSignalAddress.item, |
| 1696 | irr->callSignalAddress.count); |
| 1697 | if (ret < 0) |
| 1698 | return -1; |
| 1699 | } |
| 1700 | |
| 1701 | return 0; |
| 1702 | } |
| 1703 | |
| 1704 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1705 | static int process_ras(struct sk_buff *skb, struct nf_conn *ct, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1706 | enum ip_conntrack_info ctinfo, |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1707 | unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1708 | unsigned char **data, RasMessage *ras) |
| 1709 | { |
| 1710 | switch (ras->choice) { |
| 1711 | case eRasMessage_gatekeeperRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1712 | return process_grq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1713 | &ras->gatekeeperRequest); |
| 1714 | case eRasMessage_gatekeeperConfirm: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1715 | return process_gcf(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1716 | &ras->gatekeeperConfirm); |
| 1717 | case eRasMessage_registrationRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1718 | return process_rrq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1719 | &ras->registrationRequest); |
| 1720 | case eRasMessage_registrationConfirm: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1721 | return process_rcf(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1722 | &ras->registrationConfirm); |
| 1723 | case eRasMessage_unregistrationRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1724 | return process_urq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1725 | &ras->unregistrationRequest); |
| 1726 | case eRasMessage_admissionRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1727 | return process_arq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1728 | &ras->admissionRequest); |
| 1729 | case eRasMessage_admissionConfirm: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1730 | return process_acf(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1731 | &ras->admissionConfirm); |
| 1732 | case eRasMessage_locationRequest: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1733 | return process_lrq(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1734 | &ras->locationRequest); |
| 1735 | case eRasMessage_locationConfirm: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1736 | return process_lcf(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1737 | &ras->locationConfirm); |
| 1738 | case eRasMessage_infoRequestResponse: |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1739 | return process_irr(skb, ct, ctinfo, protoff, data, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1740 | &ras->infoRequestResponse); |
| 1741 | default: |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1742 | pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1743 | break; |
| 1744 | } |
| 1745 | |
| 1746 | return 0; |
| 1747 | } |
| 1748 | |
| 1749 | /****************************************************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1750 | static int ras_help(struct sk_buff *skb, unsigned int protoff, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1751 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1752 | { |
| 1753 | static RasMessage ras; |
| 1754 | unsigned char *data; |
| 1755 | int datalen = 0; |
| 1756 | int ret; |
| 1757 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1758 | pr_debug("nf_ct_ras: skblen = %u\n", skb->len); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1759 | |
| 1760 | spin_lock_bh(&nf_h323_lock); |
| 1761 | |
| 1762 | /* Get UDP data */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1763 | data = get_udp_data(skb, protoff, &datalen); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1764 | if (data == NULL) |
| 1765 | goto accept; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1766 | pr_debug("nf_ct_ras: RAS message len=%d ", datalen); |
Jan Engelhardt | 3c9fba6 | 2008-04-14 11:15:54 +0200 | [diff] [blame] | 1767 | nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1768 | |
| 1769 | /* Decode RAS message */ |
| 1770 | ret = DecodeRasMessage(data, datalen, &ras); |
| 1771 | if (ret < 0) { |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1772 | pr_debug("nf_ct_ras: decoding error: %s\n", |
| 1773 | ret == H323_ERROR_BOUND ? |
| 1774 | "out of bound" : "out of range"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1775 | goto accept; |
| 1776 | } |
| 1777 | |
| 1778 | /* Process RAS message */ |
Patrick McHardy | 051966c | 2012-08-26 19:14:04 +0200 | [diff] [blame] | 1779 | if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0) |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1780 | goto drop; |
| 1781 | |
| 1782 | accept: |
| 1783 | spin_unlock_bh(&nf_h323_lock); |
| 1784 | return NF_ACCEPT; |
| 1785 | |
| 1786 | drop: |
| 1787 | spin_unlock_bh(&nf_h323_lock); |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 1788 | nf_ct_helper_log(skb, ct, "cannot process RAS message"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1789 | return NF_DROP; |
| 1790 | } |
| 1791 | |
| 1792 | /****************************************************************************/ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1793 | static const struct nf_conntrack_expect_policy ras_exp_policy = { |
| 1794 | .max_expected = 32, |
| 1795 | .timeout = 240, |
| 1796 | }; |
| 1797 | |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1798 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
| 1799 | { |
| 1800 | .name = "RAS", |
| 1801 | .me = THIS_MODULE, |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 1802 | .data_len = sizeof(struct nf_ct_h323_master), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1803 | .tuple.src.l3num = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 1804 | .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1805 | .tuple.dst.protonum = IPPROTO_UDP, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1806 | .help = ras_help, |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 1807 | .expect_policy = &ras_exp_policy, |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1808 | }, |
| 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_INET6, |
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 | |
| 1821 | /****************************************************************************/ |
| 1822 | static void __exit nf_conntrack_h323_fini(void) |
| 1823 | { |
| 1824 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); |
| 1825 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
| 1826 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
| 1827 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1828 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1829 | kfree(h323_buffer); |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1830 | pr_debug("nf_ct_h323: fini\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1831 | } |
| 1832 | |
| 1833 | /****************************************************************************/ |
| 1834 | static int __init nf_conntrack_h323_init(void) |
| 1835 | { |
| 1836 | int ret; |
| 1837 | |
| 1838 | h323_buffer = kmalloc(65536, GFP_KERNEL); |
| 1839 | if (!h323_buffer) |
| 1840 | return -ENOMEM; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1841 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1842 | if (ret < 0) |
| 1843 | goto err1; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1844 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1845 | if (ret < 0) |
| 1846 | goto err2; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1847 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1848 | if (ret < 0) |
| 1849 | goto err3; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1850 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1851 | if (ret < 0) |
| 1852 | goto err4; |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1853 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); |
| 1854 | if (ret < 0) |
| 1855 | goto err5; |
Patrick McHardy | 0d53778 | 2007-07-07 22:39:38 -0700 | [diff] [blame] | 1856 | pr_debug("nf_ct_h323: init success\n"); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1857 | return 0; |
| 1858 | |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1859 | err5: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1860 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1861 | err4: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1862 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1863 | err3: |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1864 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
Patrick McHardy | a56b8f8 | 2008-06-17 15:52:32 -0700 | [diff] [blame] | 1865 | err2: |
| 1866 | nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1867 | err1: |
Patrick McHardy | 8a54886 | 2008-06-17 15:52:07 -0700 | [diff] [blame] | 1868 | kfree(h323_buffer); |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1869 | return ret; |
| 1870 | } |
| 1871 | |
| 1872 | /****************************************************************************/ |
| 1873 | module_init(nf_conntrack_h323_init); |
| 1874 | module_exit(nf_conntrack_h323_fini); |
| 1875 | |
| 1876 | EXPORT_SYMBOL_GPL(get_h225_addr); |
| 1877 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); |
| 1878 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); |
| 1879 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); |
| 1880 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); |
| 1881 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); |
| 1882 | EXPORT_SYMBOL_GPL(nat_t120_hook); |
| 1883 | EXPORT_SYMBOL_GPL(nat_h245_hook); |
| 1884 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); |
| 1885 | EXPORT_SYMBOL_GPL(nat_q931_hook); |
| 1886 | |
| 1887 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); |
| 1888 | MODULE_DESCRIPTION("H.323 connection tracking helper"); |
| 1889 | MODULE_LICENSE("GPL"); |
| 1890 | MODULE_ALIAS("ip_conntrack_h323"); |
Pablo Neira Ayuso | be3eed2 | 2012-05-14 00:42:02 +0200 | [diff] [blame] | 1891 | MODULE_ALIAS_NFCT_HELPER("RAS"); |
| 1892 | MODULE_ALIAS_NFCT_HELPER("Q.931"); |
| 1893 | MODULE_ALIAS_NFCT_HELPER("H.245"); |