Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 1 | #include <linux/kernel.h> |
| 2 | #include <linux/ip.h> |
| 3 | #include <linux/sctp.h> |
| 4 | #include <net/ip.h> |
| 5 | #include <net/ip6_checksum.h> |
| 6 | #include <linux/netfilter.h> |
| 7 | #include <linux/netfilter_ipv4.h> |
| 8 | #include <net/sctp/checksum.h> |
| 9 | #include <net/ip_vs.h> |
| 10 | |
| 11 | |
| 12 | static struct ip_vs_conn * |
| 13 | sctp_conn_in_get(int af, |
| 14 | const struct sk_buff *skb, |
| 15 | struct ip_vs_protocol *pp, |
| 16 | const struct ip_vs_iphdr *iph, |
| 17 | unsigned int proto_off, |
| 18 | int inverse) |
| 19 | { |
| 20 | __be16 _ports[2], *pptr; |
| 21 | |
| 22 | pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports); |
| 23 | if (pptr == NULL) |
| 24 | return NULL; |
| 25 | |
| 26 | if (likely(!inverse)) |
| 27 | return ip_vs_conn_in_get(af, iph->protocol, |
| 28 | &iph->saddr, pptr[0], |
| 29 | &iph->daddr, pptr[1]); |
| 30 | else |
| 31 | return ip_vs_conn_in_get(af, iph->protocol, |
| 32 | &iph->daddr, pptr[1], |
| 33 | &iph->saddr, pptr[0]); |
| 34 | } |
| 35 | |
| 36 | static struct ip_vs_conn * |
| 37 | sctp_conn_out_get(int af, |
| 38 | const struct sk_buff *skb, |
| 39 | struct ip_vs_protocol *pp, |
| 40 | const struct ip_vs_iphdr *iph, |
| 41 | unsigned int proto_off, |
| 42 | int inverse) |
| 43 | { |
| 44 | __be16 _ports[2], *pptr; |
| 45 | |
| 46 | pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports); |
| 47 | if (pptr == NULL) |
| 48 | return NULL; |
| 49 | |
| 50 | if (likely(!inverse)) |
| 51 | return ip_vs_conn_out_get(af, iph->protocol, |
| 52 | &iph->saddr, pptr[0], |
| 53 | &iph->daddr, pptr[1]); |
| 54 | else |
| 55 | return ip_vs_conn_out_get(af, iph->protocol, |
| 56 | &iph->daddr, pptr[1], |
| 57 | &iph->saddr, pptr[0]); |
| 58 | } |
| 59 | |
| 60 | static int |
| 61 | sctp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 62 | int *verdict, struct ip_vs_conn **cpp) |
| 63 | { |
| 64 | struct ip_vs_service *svc; |
| 65 | sctp_chunkhdr_t _schunkh, *sch; |
| 66 | sctp_sctphdr_t *sh, _sctph; |
| 67 | struct ip_vs_iphdr iph; |
| 68 | |
| 69 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
| 70 | |
| 71 | sh = skb_header_pointer(skb, iph.len, sizeof(_sctph), &_sctph); |
| 72 | if (sh == NULL) |
| 73 | return 0; |
| 74 | |
| 75 | sch = skb_header_pointer(skb, iph.len + sizeof(sctp_sctphdr_t), |
| 76 | sizeof(_schunkh), &_schunkh); |
| 77 | if (sch == NULL) |
| 78 | return 0; |
| 79 | |
| 80 | if ((sch->type == SCTP_CID_INIT) && |
| 81 | (svc = ip_vs_service_get(af, skb->mark, iph.protocol, |
| 82 | &iph.daddr, sh->dest))) { |
| 83 | if (ip_vs_todrop()) { |
| 84 | /* |
| 85 | * It seems that we are very loaded. |
| 86 | * We have to drop this packet :( |
| 87 | */ |
| 88 | ip_vs_service_put(svc); |
| 89 | *verdict = NF_DROP; |
| 90 | return 0; |
| 91 | } |
| 92 | /* |
| 93 | * Let the virtual server select a real server for the |
| 94 | * incoming connection, and create a connection entry. |
| 95 | */ |
| 96 | *cpp = ip_vs_schedule(svc, skb); |
| 97 | if (!*cpp) { |
| 98 | *verdict = ip_vs_leave(svc, skb, pp); |
| 99 | return 0; |
| 100 | } |
| 101 | ip_vs_service_put(svc); |
| 102 | } |
| 103 | |
| 104 | return 1; |
| 105 | } |
| 106 | |
| 107 | static int |
| 108 | sctp_snat_handler(struct sk_buff *skb, |
| 109 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| 110 | { |
| 111 | sctp_sctphdr_t *sctph; |
| 112 | unsigned int sctphoff; |
| 113 | __be32 crc32; |
| 114 | |
| 115 | #ifdef CONFIG_IP_VS_IPV6 |
| 116 | if (cp->af == AF_INET6) |
| 117 | sctphoff = sizeof(struct ipv6hdr); |
| 118 | else |
| 119 | #endif |
| 120 | sctphoff = ip_hdrlen(skb); |
| 121 | |
| 122 | /* csum_check requires unshared skb */ |
| 123 | if (!skb_make_writable(skb, sctphoff + sizeof(*sctph))) |
| 124 | return 0; |
| 125 | |
| 126 | if (unlikely(cp->app != NULL)) { |
| 127 | /* Some checks before mangling */ |
| 128 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
| 129 | return 0; |
| 130 | |
| 131 | /* Call application helper if needed */ |
| 132 | if (!ip_vs_app_pkt_out(cp, skb)) |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | sctph = (void *) skb_network_header(skb) + sctphoff; |
| 137 | sctph->source = cp->vport; |
| 138 | |
| 139 | /* Calculate the checksum */ |
| 140 | crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff); |
| 141 | for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) |
| 142 | crc32 = sctp_update_cksum((u8 *) skb->data, skb_headlen(skb), |
| 143 | crc32); |
| 144 | crc32 = sctp_end_cksum(crc32); |
| 145 | sctph->checksum = crc32; |
| 146 | |
| 147 | return 1; |
| 148 | } |
| 149 | |
| 150 | static int |
| 151 | sctp_dnat_handler(struct sk_buff *skb, |
| 152 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| 153 | { |
| 154 | |
| 155 | sctp_sctphdr_t *sctph; |
| 156 | unsigned int sctphoff; |
| 157 | __be32 crc32; |
| 158 | |
| 159 | #ifdef CONFIG_IP_VS_IPV6 |
| 160 | if (cp->af == AF_INET6) |
| 161 | sctphoff = sizeof(struct ipv6hdr); |
| 162 | else |
| 163 | #endif |
| 164 | sctphoff = ip_hdrlen(skb); |
| 165 | |
| 166 | /* csum_check requires unshared skb */ |
| 167 | if (!skb_make_writable(skb, sctphoff + sizeof(*sctph))) |
| 168 | return 0; |
| 169 | |
| 170 | if (unlikely(cp->app != NULL)) { |
| 171 | /* Some checks before mangling */ |
| 172 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
| 173 | return 0; |
| 174 | |
| 175 | /* Call application helper if needed */ |
Xiaoyu Du | 8a0acaa | 2010-07-09 17:27:47 +0200 | [diff] [blame^] | 176 | if (!ip_vs_app_pkt_in(cp, skb)) |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | sctph = (void *) skb_network_header(skb) + sctphoff; |
| 181 | sctph->dest = cp->dport; |
| 182 | |
| 183 | /* Calculate the checksum */ |
| 184 | crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff); |
| 185 | for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) |
| 186 | crc32 = sctp_update_cksum((u8 *) skb->data, skb_headlen(skb), |
| 187 | crc32); |
| 188 | crc32 = sctp_end_cksum(crc32); |
| 189 | sctph->checksum = crc32; |
| 190 | |
| 191 | return 1; |
| 192 | } |
| 193 | |
| 194 | static int |
| 195 | sctp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp) |
| 196 | { |
| 197 | struct sk_buff *list = skb_shinfo(skb)->frag_list; |
| 198 | unsigned int sctphoff; |
| 199 | struct sctphdr *sh, _sctph; |
| 200 | __le32 cmp; |
| 201 | __le32 val; |
| 202 | __u32 tmp; |
| 203 | |
| 204 | #ifdef CONFIG_IP_VS_IPV6 |
| 205 | if (af == AF_INET6) |
| 206 | sctphoff = sizeof(struct ipv6hdr); |
| 207 | else |
| 208 | #endif |
| 209 | sctphoff = ip_hdrlen(skb); |
| 210 | |
| 211 | sh = skb_header_pointer(skb, sctphoff, sizeof(_sctph), &_sctph); |
| 212 | if (sh == NULL) |
| 213 | return 0; |
| 214 | |
| 215 | cmp = sh->checksum; |
| 216 | |
| 217 | tmp = sctp_start_cksum((__u8 *) sh, skb_headlen(skb)); |
| 218 | for (; list; list = list->next) |
| 219 | tmp = sctp_update_cksum((__u8 *) list->data, |
| 220 | skb_headlen(list), tmp); |
| 221 | |
| 222 | val = sctp_end_cksum(tmp); |
| 223 | |
| 224 | if (val != cmp) { |
| 225 | /* CRC failure, dump it. */ |
| 226 | IP_VS_DBG_RL_PKT(0, pp, skb, 0, |
| 227 | "Failed checksum for"); |
| 228 | return 0; |
| 229 | } |
| 230 | return 1; |
| 231 | } |
| 232 | |
| 233 | struct ipvs_sctp_nextstate { |
| 234 | int next_state; |
| 235 | }; |
| 236 | enum ipvs_sctp_event_t { |
| 237 | IP_VS_SCTP_EVE_DATA_CLI, |
| 238 | IP_VS_SCTP_EVE_DATA_SER, |
| 239 | IP_VS_SCTP_EVE_INIT_CLI, |
| 240 | IP_VS_SCTP_EVE_INIT_SER, |
| 241 | IP_VS_SCTP_EVE_INIT_ACK_CLI, |
| 242 | IP_VS_SCTP_EVE_INIT_ACK_SER, |
| 243 | IP_VS_SCTP_EVE_COOKIE_ECHO_CLI, |
| 244 | IP_VS_SCTP_EVE_COOKIE_ECHO_SER, |
| 245 | IP_VS_SCTP_EVE_COOKIE_ACK_CLI, |
| 246 | IP_VS_SCTP_EVE_COOKIE_ACK_SER, |
| 247 | IP_VS_SCTP_EVE_ABORT_CLI, |
| 248 | IP_VS_SCTP_EVE__ABORT_SER, |
| 249 | IP_VS_SCTP_EVE_SHUT_CLI, |
| 250 | IP_VS_SCTP_EVE_SHUT_SER, |
| 251 | IP_VS_SCTP_EVE_SHUT_ACK_CLI, |
| 252 | IP_VS_SCTP_EVE_SHUT_ACK_SER, |
| 253 | IP_VS_SCTP_EVE_SHUT_COM_CLI, |
| 254 | IP_VS_SCTP_EVE_SHUT_COM_SER, |
| 255 | IP_VS_SCTP_EVE_LAST |
| 256 | }; |
| 257 | |
| 258 | static enum ipvs_sctp_event_t sctp_events[255] = { |
| 259 | IP_VS_SCTP_EVE_DATA_CLI, |
| 260 | IP_VS_SCTP_EVE_INIT_CLI, |
| 261 | IP_VS_SCTP_EVE_INIT_ACK_CLI, |
| 262 | IP_VS_SCTP_EVE_DATA_CLI, |
| 263 | IP_VS_SCTP_EVE_DATA_CLI, |
| 264 | IP_VS_SCTP_EVE_DATA_CLI, |
| 265 | IP_VS_SCTP_EVE_ABORT_CLI, |
| 266 | IP_VS_SCTP_EVE_SHUT_CLI, |
| 267 | IP_VS_SCTP_EVE_SHUT_ACK_CLI, |
| 268 | IP_VS_SCTP_EVE_DATA_CLI, |
| 269 | IP_VS_SCTP_EVE_COOKIE_ECHO_CLI, |
| 270 | IP_VS_SCTP_EVE_COOKIE_ACK_CLI, |
| 271 | IP_VS_SCTP_EVE_DATA_CLI, |
| 272 | IP_VS_SCTP_EVE_DATA_CLI, |
| 273 | IP_VS_SCTP_EVE_SHUT_COM_CLI, |
| 274 | }; |
| 275 | |
| 276 | static struct ipvs_sctp_nextstate |
| 277 | sctp_states_table[IP_VS_SCTP_S_LAST][IP_VS_SCTP_EVE_LAST] = { |
| 278 | /* |
| 279 | * STATE : IP_VS_SCTP_S_NONE |
| 280 | */ |
| 281 | /*next state *//*event */ |
| 282 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 283 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 284 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 285 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 286 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 287 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 288 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 289 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 290 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 291 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 292 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 293 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 294 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 295 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 296 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 297 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 298 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 299 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }, |
| 300 | }, |
| 301 | /* |
| 302 | * STATE : IP_VS_SCTP_S_INIT_CLI |
| 303 | * Cient sent INIT and is waiting for reply from server(In ECHO_WAIT) |
| 304 | */ |
| 305 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 306 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 307 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 308 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 309 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 310 | {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 311 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ECHO_CLI */ }, |
| 312 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_ECHO_SER */ }, |
| 313 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 314 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 315 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 316 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 317 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 318 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 319 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 320 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 321 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 322 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 323 | }, |
| 324 | /* |
| 325 | * State : IP_VS_SCTP_S_INIT_SER |
| 326 | * Server sent INIT and waiting for INIT ACK from the client |
| 327 | */ |
| 328 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 329 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 330 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 331 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 332 | {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 333 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 334 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 335 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 336 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 337 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 338 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 339 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 340 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 341 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 342 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 343 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 344 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 345 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 346 | }, |
| 347 | /* |
| 348 | * State : IP_VS_SCTP_S_INIT_ACK_CLI |
| 349 | * Client sent INIT ACK and waiting for ECHO from the server |
| 350 | */ |
| 351 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 352 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 353 | /* |
| 354 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 355 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 356 | * an INIT ACK using the same parameters it sent in its original |
| 357 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 358 | */ |
| 359 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 360 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 361 | /* |
| 362 | * INIT_ACK has been resent by the client, let us stay is in |
| 363 | * the same state |
| 364 | */ |
| 365 | {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 366 | /* |
| 367 | * INIT_ACK sent by the server, close the connection |
| 368 | */ |
| 369 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 370 | /* |
| 371 | * ECHO by client, it should not happen, close the connection |
| 372 | */ |
| 373 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 374 | /* |
| 375 | * ECHO by server, this is what we are expecting, move to ECHO_SER |
| 376 | */ |
| 377 | {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 378 | /* |
| 379 | * COOKIE ACK from client, it should not happen, close the connection |
| 380 | */ |
| 381 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 382 | /* |
| 383 | * Unexpected COOKIE ACK from server, staty in the same state |
| 384 | */ |
| 385 | {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 386 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 387 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 388 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 389 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 390 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 391 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 392 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 393 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 394 | }, |
| 395 | /* |
| 396 | * State : IP_VS_SCTP_S_INIT_ACK_SER |
| 397 | * Server sent INIT ACK and waiting for ECHO from the client |
| 398 | */ |
| 399 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 400 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 401 | /* |
| 402 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 403 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 404 | * an INIT ACK using the same parameters it sent in its original |
| 405 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 406 | */ |
| 407 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 408 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 409 | /* |
| 410 | * Unexpected INIT_ACK by the client, let us close the connection |
| 411 | */ |
| 412 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 413 | /* |
| 414 | * INIT_ACK resent by the server, let us move to same state |
| 415 | */ |
| 416 | {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 417 | /* |
| 418 | * Client send the ECHO, this is what we are expecting, |
| 419 | * move to ECHO_CLI |
| 420 | */ |
| 421 | {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 422 | /* |
| 423 | * ECHO received from the server, Not sure what to do, |
| 424 | * let us close it |
| 425 | */ |
| 426 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 427 | /* |
| 428 | * COOKIE ACK from client, let us stay in the same state |
| 429 | */ |
| 430 | {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 431 | /* |
| 432 | * COOKIE ACK from server, hmm... this should not happen, lets close |
| 433 | * the connection. |
| 434 | */ |
| 435 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 436 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 437 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 438 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 439 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 440 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 441 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 442 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 443 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 444 | }, |
| 445 | /* |
| 446 | * State : IP_VS_SCTP_S_ECHO_CLI |
| 447 | * Cient sent ECHO and waiting COOKEI ACK from the Server |
| 448 | */ |
| 449 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 450 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 451 | /* |
| 452 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 453 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 454 | * an INIT ACK using the same parameters it sent in its original |
| 455 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 456 | */ |
| 457 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 458 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 459 | /* |
| 460 | * INIT_ACK has been by the client, let us close the connection |
| 461 | */ |
| 462 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 463 | /* |
| 464 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 465 | * “If an INIT ACK is received by an endpoint in any state other |
| 466 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 467 | * INIT ACK chunk”. Stay in the same state |
| 468 | */ |
| 469 | {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 470 | /* |
| 471 | * Client resent the ECHO, let us stay in the same state |
| 472 | */ |
| 473 | {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 474 | /* |
| 475 | * ECHO received from the server, Not sure what to do, |
| 476 | * let us close it |
| 477 | */ |
| 478 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 479 | /* |
| 480 | * COOKIE ACK from client, this shoud not happen, let's close the |
| 481 | * connection |
| 482 | */ |
| 483 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 484 | /* |
| 485 | * COOKIE ACK from server, this is what we are awaiting,lets move to |
| 486 | * ESTABLISHED. |
| 487 | */ |
| 488 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 489 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 490 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 491 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 492 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 493 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 494 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 495 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 496 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 497 | }, |
| 498 | /* |
| 499 | * State : IP_VS_SCTP_S_ECHO_SER |
| 500 | * Server sent ECHO and waiting COOKEI ACK from the client |
| 501 | */ |
| 502 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 503 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 504 | /* |
| 505 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 506 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 507 | * an INIT ACK using the same parameters it sent in its original |
| 508 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 509 | */ |
| 510 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 511 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 512 | /* |
| 513 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 514 | * “If an INIT ACK is received by an endpoint in any state other |
| 515 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 516 | * INIT ACK chunk”. Stay in the same state |
| 517 | */ |
| 518 | {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 519 | /* |
| 520 | * INIT_ACK has been by the server, let us close the connection |
| 521 | */ |
| 522 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 523 | /* |
| 524 | * Client sent the ECHO, not sure what to do, let's close the |
| 525 | * connection. |
| 526 | */ |
| 527 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 528 | /* |
| 529 | * ECHO resent by the server, stay in the same state |
| 530 | */ |
| 531 | {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 532 | /* |
| 533 | * COOKIE ACK from client, this is what we are expecting, let's move |
| 534 | * to ESTABLISHED. |
| 535 | */ |
| 536 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 537 | /* |
| 538 | * COOKIE ACK from server, this should not happen, lets close the |
| 539 | * connection. |
| 540 | */ |
| 541 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 542 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 543 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 544 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 545 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 546 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 547 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 548 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 549 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 550 | }, |
| 551 | /* |
| 552 | * State : IP_VS_SCTP_S_ESTABLISHED |
| 553 | * Association established |
| 554 | */ |
| 555 | {{IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 556 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 557 | /* |
| 558 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 559 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 560 | * an INIT ACK using the same parameters it sent in its original |
| 561 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 562 | */ |
| 563 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 564 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 565 | /* |
| 566 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 567 | * “If an INIT ACK is received by an endpoint in any state other |
| 568 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 569 | * INIT ACK chunk”. Stay in the same state |
| 570 | */ |
| 571 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 572 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 573 | /* |
| 574 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 575 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 576 | * it will send ERROR chunk. So, stay in the same state |
| 577 | */ |
| 578 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 579 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 580 | /* |
| 581 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 582 | */ |
| 583 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 584 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 585 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 586 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 587 | /* |
| 588 | * SHUTDOWN from the client, move to SHUDDOWN_CLI |
| 589 | */ |
| 590 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 591 | /* |
| 592 | * SHUTDOWN from the server, move to SHUTDOWN_SER |
| 593 | */ |
| 594 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 595 | /* |
| 596 | * client sent SHUDTDOWN_ACK, this should not happen, let's close |
| 597 | * the connection |
| 598 | */ |
| 599 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 600 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 601 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 602 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 603 | }, |
| 604 | /* |
| 605 | * State : IP_VS_SCTP_S_SHUT_CLI |
| 606 | * SHUTDOWN sent from the client, waitinf for SHUT ACK from the server |
| 607 | */ |
| 608 | /* |
| 609 | * We recieved the data chuck, keep the state unchanged. I assume |
| 610 | * that still data chuncks can be received by both the peers in |
| 611 | * SHUDOWN state |
| 612 | */ |
| 613 | |
| 614 | {{IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 615 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 616 | /* |
| 617 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 618 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 619 | * an INIT ACK using the same parameters it sent in its original |
| 620 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 621 | */ |
| 622 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 623 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 624 | /* |
| 625 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 626 | * “If an INIT ACK is received by an endpoint in any state other |
| 627 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 628 | * INIT ACK chunk”. Stay in the same state |
| 629 | */ |
| 630 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 631 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 632 | /* |
| 633 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 634 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 635 | * it will send ERROR chunk. So, stay in the same state |
| 636 | */ |
| 637 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 638 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 639 | /* |
| 640 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 641 | */ |
| 642 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 643 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 644 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 645 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 646 | /* |
| 647 | * SHUTDOWN resent from the client, move to SHUDDOWN_CLI |
| 648 | */ |
| 649 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 650 | /* |
| 651 | * SHUTDOWN from the server, move to SHUTDOWN_SER |
| 652 | */ |
| 653 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 654 | /* |
| 655 | * client sent SHUDTDOWN_ACK, this should not happen, let's close |
| 656 | * the connection |
| 657 | */ |
| 658 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 659 | /* |
| 660 | * Server sent SHUTDOWN ACK, this is what we are expecting, let's move |
| 661 | * to SHUDOWN_ACK_SER |
| 662 | */ |
| 663 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 664 | /* |
| 665 | * SHUTDOWN COM from client, this should not happen, let's close the |
| 666 | * connection |
| 667 | */ |
| 668 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 669 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 670 | }, |
| 671 | /* |
| 672 | * State : IP_VS_SCTP_S_SHUT_SER |
| 673 | * SHUTDOWN sent from the server, waitinf for SHUTDOWN ACK from client |
| 674 | */ |
| 675 | /* |
| 676 | * We recieved the data chuck, keep the state unchanged. I assume |
| 677 | * that still data chuncks can be received by both the peers in |
| 678 | * SHUDOWN state |
| 679 | */ |
| 680 | |
| 681 | {{IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 682 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 683 | /* |
| 684 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 685 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 686 | * an INIT ACK using the same parameters it sent in its original |
| 687 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 688 | */ |
| 689 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 690 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 691 | /* |
| 692 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 693 | * “If an INIT ACK is received by an endpoint in any state other |
| 694 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 695 | * INIT ACK chunk”. Stay in the same state |
| 696 | */ |
| 697 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 698 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 699 | /* |
| 700 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 701 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 702 | * it will send ERROR chunk. So, stay in the same state |
| 703 | */ |
| 704 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 705 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 706 | /* |
| 707 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 708 | */ |
| 709 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 710 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 711 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 712 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 713 | /* |
| 714 | * SHUTDOWN resent from the client, move to SHUDDOWN_CLI |
| 715 | */ |
| 716 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 717 | /* |
| 718 | * SHUTDOWN resent from the server, move to SHUTDOWN_SER |
| 719 | */ |
| 720 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 721 | /* |
| 722 | * client sent SHUDTDOWN_ACK, this is what we are expecting, let's |
| 723 | * move to SHUT_ACK_CLI |
| 724 | */ |
| 725 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 726 | /* |
| 727 | * Server sent SHUTDOWN ACK, this should not happen, let's close the |
| 728 | * connection |
| 729 | */ |
| 730 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 731 | /* |
| 732 | * SHUTDOWN COM from client, this should not happen, let's close the |
| 733 | * connection |
| 734 | */ |
| 735 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 736 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 737 | }, |
| 738 | |
| 739 | /* |
| 740 | * State : IP_VS_SCTP_S_SHUT_ACK_CLI |
| 741 | * SHUTDOWN ACK from the client, awaiting for SHUTDOWN COM from server |
| 742 | */ |
| 743 | /* |
| 744 | * We recieved the data chuck, keep the state unchanged. I assume |
| 745 | * that still data chuncks can be received by both the peers in |
| 746 | * SHUDOWN state |
| 747 | */ |
| 748 | |
| 749 | {{IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 750 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 751 | /* |
| 752 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 753 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 754 | * an INIT ACK using the same parameters it sent in its original |
| 755 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 756 | */ |
| 757 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 758 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 759 | /* |
| 760 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 761 | * “If an INIT ACK is received by an endpoint in any state other |
| 762 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 763 | * INIT ACK chunk”. Stay in the same state |
| 764 | */ |
| 765 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 766 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 767 | /* |
| 768 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 769 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 770 | * it will send ERROR chunk. So, stay in the same state |
| 771 | */ |
| 772 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 773 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 774 | /* |
| 775 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 776 | */ |
| 777 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 778 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 779 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 780 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 781 | /* |
| 782 | * SHUTDOWN sent from the client, move to SHUDDOWN_CLI |
| 783 | */ |
| 784 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 785 | /* |
| 786 | * SHUTDOWN sent from the server, move to SHUTDOWN_SER |
| 787 | */ |
| 788 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 789 | /* |
| 790 | * client resent SHUDTDOWN_ACK, let's stay in the same state |
| 791 | */ |
| 792 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 793 | /* |
| 794 | * Server sent SHUTDOWN ACK, this should not happen, let's close the |
| 795 | * connection |
| 796 | */ |
| 797 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 798 | /* |
| 799 | * SHUTDOWN COM from client, this should not happen, let's close the |
| 800 | * connection |
| 801 | */ |
| 802 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 803 | /* |
| 804 | * SHUTDOWN COMPLETE from server this is what we are expecting. |
| 805 | */ |
| 806 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 807 | }, |
| 808 | |
| 809 | /* |
| 810 | * State : IP_VS_SCTP_S_SHUT_ACK_SER |
| 811 | * SHUTDOWN ACK from the server, awaiting for SHUTDOWN COM from client |
| 812 | */ |
| 813 | /* |
| 814 | * We recieved the data chuck, keep the state unchanged. I assume |
| 815 | * that still data chuncks can be received by both the peers in |
| 816 | * SHUDOWN state |
| 817 | */ |
| 818 | |
| 819 | {{IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 820 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 821 | /* |
| 822 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 823 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 824 | * an INIT ACK using the same parameters it sent in its original |
| 825 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 826 | */ |
| 827 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 828 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 829 | /* |
| 830 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 831 | * “If an INIT ACK is received by an endpoint in any state other |
| 832 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 833 | * INIT ACK chunk”. Stay in the same state |
| 834 | */ |
| 835 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 836 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 837 | /* |
| 838 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 839 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 840 | * it will send ERROR chunk. So, stay in the same state |
| 841 | */ |
| 842 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 843 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 844 | /* |
| 845 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 846 | */ |
| 847 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 848 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 849 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 850 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 851 | /* |
| 852 | * SHUTDOWN sent from the client, move to SHUDDOWN_CLI |
| 853 | */ |
| 854 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 855 | /* |
| 856 | * SHUTDOWN sent from the server, move to SHUTDOWN_SER |
| 857 | */ |
| 858 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 859 | /* |
| 860 | * client sent SHUDTDOWN_ACK, this should not happen let's close |
| 861 | * the connection. |
| 862 | */ |
| 863 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 864 | /* |
| 865 | * Server resent SHUTDOWN ACK, stay in the same state |
| 866 | */ |
| 867 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 868 | /* |
| 869 | * SHUTDOWN COM from client, this what we are expecting, let's close |
| 870 | * the connection |
| 871 | */ |
| 872 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 873 | /* |
| 874 | * SHUTDOWN COMPLETE from server this should not happen. |
| 875 | */ |
| 876 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 877 | }, |
| 878 | /* |
| 879 | * State : IP_VS_SCTP_S_CLOSED |
| 880 | */ |
| 881 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 882 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 883 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 884 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 885 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 886 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 887 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 888 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 889 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 890 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 891 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 892 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 893 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 894 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 895 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 896 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 897 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 898 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 899 | } |
| 900 | }; |
| 901 | |
| 902 | /* |
| 903 | * Timeout table[state] |
| 904 | */ |
| 905 | static int sctp_timeouts[IP_VS_SCTP_S_LAST + 1] = { |
| 906 | [IP_VS_SCTP_S_NONE] = 2 * HZ, |
| 907 | [IP_VS_SCTP_S_INIT_CLI] = 1 * 60 * HZ, |
| 908 | [IP_VS_SCTP_S_INIT_SER] = 1 * 60 * HZ, |
| 909 | [IP_VS_SCTP_S_INIT_ACK_CLI] = 1 * 60 * HZ, |
| 910 | [IP_VS_SCTP_S_INIT_ACK_SER] = 1 * 60 * HZ, |
| 911 | [IP_VS_SCTP_S_ECHO_CLI] = 1 * 60 * HZ, |
| 912 | [IP_VS_SCTP_S_ECHO_SER] = 1 * 60 * HZ, |
| 913 | [IP_VS_SCTP_S_ESTABLISHED] = 15 * 60 * HZ, |
| 914 | [IP_VS_SCTP_S_SHUT_CLI] = 1 * 60 * HZ, |
| 915 | [IP_VS_SCTP_S_SHUT_SER] = 1 * 60 * HZ, |
| 916 | [IP_VS_SCTP_S_SHUT_ACK_CLI] = 1 * 60 * HZ, |
| 917 | [IP_VS_SCTP_S_SHUT_ACK_SER] = 1 * 60 * HZ, |
| 918 | [IP_VS_SCTP_S_CLOSED] = 10 * HZ, |
| 919 | [IP_VS_SCTP_S_LAST] = 2 * HZ, |
| 920 | }; |
| 921 | |
| 922 | static const char *sctp_state_name_table[IP_VS_SCTP_S_LAST + 1] = { |
| 923 | [IP_VS_SCTP_S_NONE] = "NONE", |
| 924 | [IP_VS_SCTP_S_INIT_CLI] = "INIT_CLI", |
| 925 | [IP_VS_SCTP_S_INIT_SER] = "INIT_SER", |
| 926 | [IP_VS_SCTP_S_INIT_ACK_CLI] = "INIT_ACK_CLI", |
| 927 | [IP_VS_SCTP_S_INIT_ACK_SER] = "INIT_ACK_SER", |
| 928 | [IP_VS_SCTP_S_ECHO_CLI] = "COOKIE_ECHO_CLI", |
| 929 | [IP_VS_SCTP_S_ECHO_SER] = "COOKIE_ECHO_SER", |
| 930 | [IP_VS_SCTP_S_ESTABLISHED] = "ESTABISHED", |
| 931 | [IP_VS_SCTP_S_SHUT_CLI] = "SHUTDOWN_CLI", |
| 932 | [IP_VS_SCTP_S_SHUT_SER] = "SHUTDOWN_SER", |
| 933 | [IP_VS_SCTP_S_SHUT_ACK_CLI] = "SHUTDOWN_ACK_CLI", |
| 934 | [IP_VS_SCTP_S_SHUT_ACK_SER] = "SHUTDOWN_ACK_SER", |
| 935 | [IP_VS_SCTP_S_CLOSED] = "CLOSED", |
| 936 | [IP_VS_SCTP_S_LAST] = "BUG!" |
| 937 | }; |
| 938 | |
| 939 | |
| 940 | static const char *sctp_state_name(int state) |
| 941 | { |
| 942 | if (state >= IP_VS_SCTP_S_LAST) |
| 943 | return "ERR!"; |
| 944 | if (sctp_state_name_table[state]) |
| 945 | return sctp_state_name_table[state]; |
| 946 | return "?"; |
| 947 | } |
| 948 | |
| 949 | static void sctp_timeout_change(struct ip_vs_protocol *pp, int flags) |
| 950 | { |
| 951 | } |
| 952 | |
| 953 | static int |
| 954 | sctp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to) |
| 955 | { |
| 956 | |
| 957 | return ip_vs_set_state_timeout(pp->timeout_table, IP_VS_SCTP_S_LAST, |
| 958 | sctp_state_name_table, sname, to); |
| 959 | } |
| 960 | |
| 961 | static inline int |
| 962 | set_sctp_state(struct ip_vs_protocol *pp, struct ip_vs_conn *cp, |
| 963 | int direction, const struct sk_buff *skb) |
| 964 | { |
| 965 | sctp_chunkhdr_t _sctpch, *sch; |
| 966 | unsigned char chunk_type; |
| 967 | int event, next_state; |
| 968 | int ihl; |
| 969 | |
| 970 | #ifdef CONFIG_IP_VS_IPV6 |
| 971 | ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr); |
| 972 | #else |
| 973 | ihl = ip_hdrlen(skb); |
| 974 | #endif |
| 975 | |
| 976 | sch = skb_header_pointer(skb, ihl + sizeof(sctp_sctphdr_t), |
| 977 | sizeof(_sctpch), &_sctpch); |
| 978 | if (sch == NULL) |
| 979 | return 0; |
| 980 | |
| 981 | chunk_type = sch->type; |
| 982 | /* |
| 983 | * Section 3: Multiple chunks can be bundled into one SCTP packet |
| 984 | * up to the MTU size, except for the INIT, INIT ACK, and |
| 985 | * SHUTDOWN COMPLETE chunks. These chunks MUST NOT be bundled with |
| 986 | * any other chunk in a packet. |
| 987 | * |
| 988 | * Section 3.3.7: DATA chunks MUST NOT be bundled with ABORT. Control |
| 989 | * chunks (except for INIT, INIT ACK, and SHUTDOWN COMPLETE) MAY be |
| 990 | * bundled with an ABORT, but they MUST be placed before the ABORT |
| 991 | * in the SCTP packet or they will be ignored by the receiver. |
| 992 | */ |
| 993 | if ((sch->type == SCTP_CID_COOKIE_ECHO) || |
| 994 | (sch->type == SCTP_CID_COOKIE_ACK)) { |
| 995 | sch = skb_header_pointer(skb, (ihl + sizeof(sctp_sctphdr_t) + |
| 996 | sch->length), sizeof(_sctpch), &_sctpch); |
| 997 | if (sch) { |
| 998 | if (sch->type == SCTP_CID_ABORT) |
| 999 | chunk_type = sch->type; |
| 1000 | } |
| 1001 | } |
| 1002 | |
| 1003 | event = sctp_events[chunk_type]; |
| 1004 | |
| 1005 | /* |
| 1006 | * If the direction is IP_VS_DIR_OUTPUT, this event is from server |
| 1007 | */ |
| 1008 | if (direction == IP_VS_DIR_OUTPUT) |
| 1009 | event++; |
| 1010 | /* |
| 1011 | * get next state |
| 1012 | */ |
| 1013 | next_state = sctp_states_table[cp->state][event].next_state; |
| 1014 | |
| 1015 | if (next_state != cp->state) { |
| 1016 | struct ip_vs_dest *dest = cp->dest; |
| 1017 | |
| 1018 | IP_VS_DBG_BUF(8, "%s %s %s:%d->" |
| 1019 | "%s:%d state: %s->%s conn->refcnt:%d\n", |
| 1020 | pp->name, |
| 1021 | ((direction == IP_VS_DIR_OUTPUT) ? |
| 1022 | "output " : "input "), |
| 1023 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), |
| 1024 | ntohs(cp->dport), |
| 1025 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| 1026 | ntohs(cp->cport), |
| 1027 | sctp_state_name(cp->state), |
| 1028 | sctp_state_name(next_state), |
| 1029 | atomic_read(&cp->refcnt)); |
| 1030 | if (dest) { |
| 1031 | if (!(cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 1032 | (next_state != IP_VS_SCTP_S_ESTABLISHED)) { |
| 1033 | atomic_dec(&dest->activeconns); |
| 1034 | atomic_inc(&dest->inactconns); |
| 1035 | cp->flags |= IP_VS_CONN_F_INACTIVE; |
| 1036 | } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 1037 | (next_state == IP_VS_SCTP_S_ESTABLISHED)) { |
| 1038 | atomic_inc(&dest->activeconns); |
| 1039 | atomic_dec(&dest->inactconns); |
| 1040 | cp->flags &= ~IP_VS_CONN_F_INACTIVE; |
| 1041 | } |
| 1042 | } |
| 1043 | } |
| 1044 | |
| 1045 | cp->timeout = pp->timeout_table[cp->state = next_state]; |
| 1046 | |
| 1047 | return 1; |
| 1048 | } |
| 1049 | |
| 1050 | static int |
| 1051 | sctp_state_transition(struct ip_vs_conn *cp, int direction, |
| 1052 | const struct sk_buff *skb, struct ip_vs_protocol *pp) |
| 1053 | { |
| 1054 | int ret = 0; |
| 1055 | |
| 1056 | spin_lock(&cp->lock); |
| 1057 | ret = set_sctp_state(pp, cp, direction, skb); |
| 1058 | spin_unlock(&cp->lock); |
| 1059 | |
| 1060 | return ret; |
| 1061 | } |
| 1062 | |
| 1063 | /* |
| 1064 | * Hash table for SCTP application incarnations |
| 1065 | */ |
| 1066 | #define SCTP_APP_TAB_BITS 4 |
| 1067 | #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) |
| 1068 | #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) |
| 1069 | |
| 1070 | static struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; |
| 1071 | static DEFINE_SPINLOCK(sctp_app_lock); |
| 1072 | |
| 1073 | static inline __u16 sctp_app_hashkey(__be16 port) |
| 1074 | { |
| 1075 | return (((__force u16)port >> SCTP_APP_TAB_BITS) ^ (__force u16)port) |
| 1076 | & SCTP_APP_TAB_MASK; |
| 1077 | } |
| 1078 | |
| 1079 | static int sctp_register_app(struct ip_vs_app *inc) |
| 1080 | { |
| 1081 | struct ip_vs_app *i; |
| 1082 | __u16 hash; |
| 1083 | __be16 port = inc->port; |
| 1084 | int ret = 0; |
| 1085 | |
| 1086 | hash = sctp_app_hashkey(port); |
| 1087 | |
| 1088 | spin_lock_bh(&sctp_app_lock); |
| 1089 | list_for_each_entry(i, &sctp_apps[hash], p_list) { |
| 1090 | if (i->port == port) { |
| 1091 | ret = -EEXIST; |
| 1092 | goto out; |
| 1093 | } |
| 1094 | } |
| 1095 | list_add(&inc->p_list, &sctp_apps[hash]); |
| 1096 | atomic_inc(&ip_vs_protocol_sctp.appcnt); |
| 1097 | out: |
| 1098 | spin_unlock_bh(&sctp_app_lock); |
| 1099 | |
| 1100 | return ret; |
| 1101 | } |
| 1102 | |
| 1103 | static void sctp_unregister_app(struct ip_vs_app *inc) |
| 1104 | { |
| 1105 | spin_lock_bh(&sctp_app_lock); |
| 1106 | atomic_dec(&ip_vs_protocol_sctp.appcnt); |
| 1107 | list_del(&inc->p_list); |
| 1108 | spin_unlock_bh(&sctp_app_lock); |
| 1109 | } |
| 1110 | |
| 1111 | static int sctp_app_conn_bind(struct ip_vs_conn *cp) |
| 1112 | { |
| 1113 | int hash; |
| 1114 | struct ip_vs_app *inc; |
| 1115 | int result = 0; |
| 1116 | |
| 1117 | /* Default binding: bind app only for NAT */ |
| 1118 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) |
| 1119 | return 0; |
| 1120 | /* Lookup application incarnations and bind the right one */ |
| 1121 | hash = sctp_app_hashkey(cp->vport); |
| 1122 | |
| 1123 | spin_lock(&sctp_app_lock); |
| 1124 | list_for_each_entry(inc, &sctp_apps[hash], p_list) { |
| 1125 | if (inc->port == cp->vport) { |
| 1126 | if (unlikely(!ip_vs_app_inc_get(inc))) |
| 1127 | break; |
| 1128 | spin_unlock(&sctp_app_lock); |
| 1129 | |
| 1130 | IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->" |
| 1131 | "%s:%u to app %s on port %u\n", |
| 1132 | __func__, |
| 1133 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| 1134 | ntohs(cp->cport), |
| 1135 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
| 1136 | ntohs(cp->vport), |
| 1137 | inc->name, ntohs(inc->port)); |
| 1138 | cp->app = inc; |
| 1139 | if (inc->init_conn) |
| 1140 | result = inc->init_conn(inc, cp); |
| 1141 | goto out; |
| 1142 | } |
| 1143 | } |
| 1144 | spin_unlock(&sctp_app_lock); |
| 1145 | out: |
| 1146 | return result; |
| 1147 | } |
| 1148 | |
| 1149 | static void ip_vs_sctp_init(struct ip_vs_protocol *pp) |
| 1150 | { |
| 1151 | IP_VS_INIT_HASH_TABLE(sctp_apps); |
| 1152 | pp->timeout_table = sctp_timeouts; |
| 1153 | } |
| 1154 | |
| 1155 | |
| 1156 | static void ip_vs_sctp_exit(struct ip_vs_protocol *pp) |
| 1157 | { |
| 1158 | |
| 1159 | } |
| 1160 | |
| 1161 | struct ip_vs_protocol ip_vs_protocol_sctp = { |
| 1162 | .name = "SCTP", |
| 1163 | .protocol = IPPROTO_SCTP, |
| 1164 | .num_states = IP_VS_SCTP_S_LAST, |
| 1165 | .dont_defrag = 0, |
| 1166 | .appcnt = ATOMIC_INIT(0), |
| 1167 | .init = ip_vs_sctp_init, |
| 1168 | .exit = ip_vs_sctp_exit, |
| 1169 | .register_app = sctp_register_app, |
| 1170 | .unregister_app = sctp_unregister_app, |
| 1171 | .conn_schedule = sctp_conn_schedule, |
| 1172 | .conn_in_get = sctp_conn_in_get, |
| 1173 | .conn_out_get = sctp_conn_out_get, |
| 1174 | .snat_handler = sctp_snat_handler, |
| 1175 | .dnat_handler = sctp_dnat_handler, |
| 1176 | .csum_check = sctp_csum_check, |
| 1177 | .state_name = sctp_state_name, |
| 1178 | .state_transition = sctp_state_transition, |
| 1179 | .app_conn_bind = sctp_app_conn_bind, |
| 1180 | .debug_packet = ip_vs_tcpudp_debug_packet, |
| 1181 | .timeout_change = sctp_timeout_change, |
| 1182 | .set_state_timeout = sctp_set_state_timeout, |
| 1183 | }; |