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 | |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 11 | static int |
| 12 | sctp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp, |
| 13 | int *verdict, struct ip_vs_conn **cpp) |
| 14 | { |
| 15 | struct ip_vs_service *svc; |
| 16 | sctp_chunkhdr_t _schunkh, *sch; |
| 17 | sctp_sctphdr_t *sh, _sctph; |
| 18 | struct ip_vs_iphdr iph; |
| 19 | |
| 20 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
| 21 | |
| 22 | sh = skb_header_pointer(skb, iph.len, sizeof(_sctph), &_sctph); |
| 23 | if (sh == NULL) |
| 24 | return 0; |
| 25 | |
| 26 | sch = skb_header_pointer(skb, iph.len + sizeof(sctp_sctphdr_t), |
| 27 | sizeof(_schunkh), &_schunkh); |
| 28 | if (sch == NULL) |
| 29 | return 0; |
| 30 | |
| 31 | if ((sch->type == SCTP_CID_INIT) && |
| 32 | (svc = ip_vs_service_get(af, skb->mark, iph.protocol, |
| 33 | &iph.daddr, sh->dest))) { |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 34 | int ignored; |
| 35 | |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 36 | if (ip_vs_todrop()) { |
| 37 | /* |
| 38 | * It seems that we are very loaded. |
| 39 | * We have to drop this packet :( |
| 40 | */ |
| 41 | ip_vs_service_put(svc); |
| 42 | *verdict = NF_DROP; |
| 43 | return 0; |
| 44 | } |
| 45 | /* |
| 46 | * Let the virtual server select a real server for the |
| 47 | * incoming connection, and create a connection entry. |
| 48 | */ |
Julian Anastasov | 190ecd2 | 2010-10-17 16:24:37 +0300 | [diff] [blame] | 49 | *cpp = ip_vs_schedule(svc, skb, pp, &ignored); |
| 50 | if (!*cpp && !ignored) { |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 51 | *verdict = ip_vs_leave(svc, skb, pp); |
| 52 | return 0; |
| 53 | } |
| 54 | ip_vs_service_put(svc); |
| 55 | } |
| 56 | |
| 57 | return 1; |
| 58 | } |
| 59 | |
| 60 | static int |
| 61 | sctp_snat_handler(struct sk_buff *skb, |
| 62 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| 63 | { |
| 64 | sctp_sctphdr_t *sctph; |
| 65 | unsigned int sctphoff; |
| 66 | __be32 crc32; |
| 67 | |
| 68 | #ifdef CONFIG_IP_VS_IPV6 |
| 69 | if (cp->af == AF_INET6) |
| 70 | sctphoff = sizeof(struct ipv6hdr); |
| 71 | else |
| 72 | #endif |
| 73 | sctphoff = ip_hdrlen(skb); |
| 74 | |
| 75 | /* csum_check requires unshared skb */ |
| 76 | if (!skb_make_writable(skb, sctphoff + sizeof(*sctph))) |
| 77 | return 0; |
| 78 | |
| 79 | if (unlikely(cp->app != NULL)) { |
| 80 | /* Some checks before mangling */ |
| 81 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
| 82 | return 0; |
| 83 | |
| 84 | /* Call application helper if needed */ |
| 85 | if (!ip_vs_app_pkt_out(cp, skb)) |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | sctph = (void *) skb_network_header(skb) + sctphoff; |
| 90 | sctph->source = cp->vport; |
| 91 | |
| 92 | /* Calculate the checksum */ |
| 93 | crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff); |
| 94 | for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) |
| 95 | crc32 = sctp_update_cksum((u8 *) skb->data, skb_headlen(skb), |
| 96 | crc32); |
| 97 | crc32 = sctp_end_cksum(crc32); |
| 98 | sctph->checksum = crc32; |
| 99 | |
| 100 | return 1; |
| 101 | } |
| 102 | |
| 103 | static int |
| 104 | sctp_dnat_handler(struct sk_buff *skb, |
| 105 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| 106 | { |
| 107 | |
| 108 | sctp_sctphdr_t *sctph; |
| 109 | unsigned int sctphoff; |
| 110 | __be32 crc32; |
| 111 | |
| 112 | #ifdef CONFIG_IP_VS_IPV6 |
| 113 | if (cp->af == AF_INET6) |
| 114 | sctphoff = sizeof(struct ipv6hdr); |
| 115 | else |
| 116 | #endif |
| 117 | sctphoff = ip_hdrlen(skb); |
| 118 | |
| 119 | /* csum_check requires unshared skb */ |
| 120 | if (!skb_make_writable(skb, sctphoff + sizeof(*sctph))) |
| 121 | return 0; |
| 122 | |
| 123 | if (unlikely(cp->app != NULL)) { |
| 124 | /* Some checks before mangling */ |
| 125 | if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
| 126 | return 0; |
| 127 | |
| 128 | /* Call application helper if needed */ |
Xiaoyu Du | 8a0acaa | 2010-07-09 17:27:47 +0200 | [diff] [blame] | 129 | if (!ip_vs_app_pkt_in(cp, skb)) |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | sctph = (void *) skb_network_header(skb) + sctphoff; |
| 134 | sctph->dest = cp->dport; |
| 135 | |
| 136 | /* Calculate the checksum */ |
| 137 | crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff); |
| 138 | for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) |
| 139 | crc32 = sctp_update_cksum((u8 *) skb->data, skb_headlen(skb), |
| 140 | crc32); |
| 141 | crc32 = sctp_end_cksum(crc32); |
| 142 | sctph->checksum = crc32; |
| 143 | |
| 144 | return 1; |
| 145 | } |
| 146 | |
| 147 | static int |
| 148 | sctp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp) |
| 149 | { |
| 150 | struct sk_buff *list = skb_shinfo(skb)->frag_list; |
| 151 | unsigned int sctphoff; |
| 152 | struct sctphdr *sh, _sctph; |
| 153 | __le32 cmp; |
| 154 | __le32 val; |
| 155 | __u32 tmp; |
| 156 | |
| 157 | #ifdef CONFIG_IP_VS_IPV6 |
| 158 | if (af == AF_INET6) |
| 159 | sctphoff = sizeof(struct ipv6hdr); |
| 160 | else |
| 161 | #endif |
| 162 | sctphoff = ip_hdrlen(skb); |
| 163 | |
| 164 | sh = skb_header_pointer(skb, sctphoff, sizeof(_sctph), &_sctph); |
| 165 | if (sh == NULL) |
| 166 | return 0; |
| 167 | |
| 168 | cmp = sh->checksum; |
| 169 | |
| 170 | tmp = sctp_start_cksum((__u8 *) sh, skb_headlen(skb)); |
| 171 | for (; list; list = list->next) |
| 172 | tmp = sctp_update_cksum((__u8 *) list->data, |
| 173 | skb_headlen(list), tmp); |
| 174 | |
| 175 | val = sctp_end_cksum(tmp); |
| 176 | |
| 177 | if (val != cmp) { |
| 178 | /* CRC failure, dump it. */ |
Julian Anastasov | 0d79641 | 2010-10-17 16:46:17 +0300 | [diff] [blame^] | 179 | IP_VS_DBG_RL_PKT(0, af, pp, skb, 0, |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 180 | "Failed checksum for"); |
| 181 | return 0; |
| 182 | } |
| 183 | return 1; |
| 184 | } |
| 185 | |
| 186 | struct ipvs_sctp_nextstate { |
| 187 | int next_state; |
| 188 | }; |
| 189 | enum ipvs_sctp_event_t { |
| 190 | IP_VS_SCTP_EVE_DATA_CLI, |
| 191 | IP_VS_SCTP_EVE_DATA_SER, |
| 192 | IP_VS_SCTP_EVE_INIT_CLI, |
| 193 | IP_VS_SCTP_EVE_INIT_SER, |
| 194 | IP_VS_SCTP_EVE_INIT_ACK_CLI, |
| 195 | IP_VS_SCTP_EVE_INIT_ACK_SER, |
| 196 | IP_VS_SCTP_EVE_COOKIE_ECHO_CLI, |
| 197 | IP_VS_SCTP_EVE_COOKIE_ECHO_SER, |
| 198 | IP_VS_SCTP_EVE_COOKIE_ACK_CLI, |
| 199 | IP_VS_SCTP_EVE_COOKIE_ACK_SER, |
| 200 | IP_VS_SCTP_EVE_ABORT_CLI, |
| 201 | IP_VS_SCTP_EVE__ABORT_SER, |
| 202 | IP_VS_SCTP_EVE_SHUT_CLI, |
| 203 | IP_VS_SCTP_EVE_SHUT_SER, |
| 204 | IP_VS_SCTP_EVE_SHUT_ACK_CLI, |
| 205 | IP_VS_SCTP_EVE_SHUT_ACK_SER, |
| 206 | IP_VS_SCTP_EVE_SHUT_COM_CLI, |
| 207 | IP_VS_SCTP_EVE_SHUT_COM_SER, |
| 208 | IP_VS_SCTP_EVE_LAST |
| 209 | }; |
| 210 | |
| 211 | static enum ipvs_sctp_event_t sctp_events[255] = { |
| 212 | IP_VS_SCTP_EVE_DATA_CLI, |
| 213 | IP_VS_SCTP_EVE_INIT_CLI, |
| 214 | IP_VS_SCTP_EVE_INIT_ACK_CLI, |
| 215 | IP_VS_SCTP_EVE_DATA_CLI, |
| 216 | IP_VS_SCTP_EVE_DATA_CLI, |
| 217 | IP_VS_SCTP_EVE_DATA_CLI, |
| 218 | IP_VS_SCTP_EVE_ABORT_CLI, |
| 219 | IP_VS_SCTP_EVE_SHUT_CLI, |
| 220 | IP_VS_SCTP_EVE_SHUT_ACK_CLI, |
| 221 | IP_VS_SCTP_EVE_DATA_CLI, |
| 222 | IP_VS_SCTP_EVE_COOKIE_ECHO_CLI, |
| 223 | IP_VS_SCTP_EVE_COOKIE_ACK_CLI, |
| 224 | IP_VS_SCTP_EVE_DATA_CLI, |
| 225 | IP_VS_SCTP_EVE_DATA_CLI, |
| 226 | IP_VS_SCTP_EVE_SHUT_COM_CLI, |
| 227 | }; |
| 228 | |
| 229 | static struct ipvs_sctp_nextstate |
| 230 | sctp_states_table[IP_VS_SCTP_S_LAST][IP_VS_SCTP_EVE_LAST] = { |
| 231 | /* |
| 232 | * STATE : IP_VS_SCTP_S_NONE |
| 233 | */ |
| 234 | /*next state *//*event */ |
| 235 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 236 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 237 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 238 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 239 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 240 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 241 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 242 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 243 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 244 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 245 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 246 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 247 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 248 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 249 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 250 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 251 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 252 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }, |
| 253 | }, |
| 254 | /* |
| 255 | * STATE : IP_VS_SCTP_S_INIT_CLI |
| 256 | * Cient sent INIT and is waiting for reply from server(In ECHO_WAIT) |
| 257 | */ |
| 258 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 259 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 260 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 261 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 262 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 263 | {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 264 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ECHO_CLI */ }, |
| 265 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_ECHO_SER */ }, |
| 266 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 267 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 268 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 269 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 270 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 271 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 272 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 273 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 274 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 275 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 276 | }, |
| 277 | /* |
| 278 | * State : IP_VS_SCTP_S_INIT_SER |
| 279 | * Server sent INIT and waiting for INIT ACK from the client |
| 280 | */ |
| 281 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 282 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 283 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 284 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 285 | {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 286 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 287 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 288 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 289 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 290 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 291 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 292 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 293 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 294 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 295 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 296 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 297 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 298 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 299 | }, |
| 300 | /* |
| 301 | * State : IP_VS_SCTP_S_INIT_ACK_CLI |
| 302 | * Client sent INIT ACK and waiting for ECHO from the server |
| 303 | */ |
| 304 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 305 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 306 | /* |
| 307 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 308 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 309 | * an INIT ACK using the same parameters it sent in its original |
| 310 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 311 | */ |
| 312 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 313 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 314 | /* |
| 315 | * INIT_ACK has been resent by the client, let us stay is in |
| 316 | * the same state |
| 317 | */ |
| 318 | {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 319 | /* |
| 320 | * INIT_ACK sent by the server, close the connection |
| 321 | */ |
| 322 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 323 | /* |
| 324 | * ECHO by client, it should not happen, close the connection |
| 325 | */ |
| 326 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 327 | /* |
| 328 | * ECHO by server, this is what we are expecting, move to ECHO_SER |
| 329 | */ |
| 330 | {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 331 | /* |
| 332 | * COOKIE ACK from client, it should not happen, close the connection |
| 333 | */ |
| 334 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 335 | /* |
| 336 | * Unexpected COOKIE ACK from server, staty in the same state |
| 337 | */ |
| 338 | {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 339 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 340 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 341 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 342 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 343 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 344 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 345 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 346 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 347 | }, |
| 348 | /* |
| 349 | * State : IP_VS_SCTP_S_INIT_ACK_SER |
| 350 | * Server sent INIT ACK and waiting for ECHO from the client |
| 351 | */ |
| 352 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 353 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 354 | /* |
| 355 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 356 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 357 | * an INIT ACK using the same parameters it sent in its original |
| 358 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 359 | */ |
| 360 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 361 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 362 | /* |
| 363 | * Unexpected INIT_ACK by the client, let us close the connection |
| 364 | */ |
| 365 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 366 | /* |
| 367 | * INIT_ACK resent by the server, let us move to same state |
| 368 | */ |
| 369 | {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 370 | /* |
| 371 | * Client send the ECHO, this is what we are expecting, |
| 372 | * move to ECHO_CLI |
| 373 | */ |
| 374 | {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 375 | /* |
| 376 | * ECHO received from the server, Not sure what to do, |
| 377 | * let us close it |
| 378 | */ |
| 379 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 380 | /* |
| 381 | * COOKIE ACK from client, let us stay in the same state |
| 382 | */ |
| 383 | {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 384 | /* |
| 385 | * COOKIE ACK from server, hmm... this should not happen, lets close |
| 386 | * the connection. |
| 387 | */ |
| 388 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 389 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 390 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 391 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 392 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 393 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 394 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 395 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 396 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 397 | }, |
| 398 | /* |
| 399 | * State : IP_VS_SCTP_S_ECHO_CLI |
| 400 | * Cient sent ECHO and waiting COOKEI ACK from the Server |
| 401 | */ |
| 402 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 403 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 404 | /* |
| 405 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 406 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 407 | * an INIT ACK using the same parameters it sent in its original |
| 408 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 409 | */ |
| 410 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 411 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 412 | /* |
| 413 | * INIT_ACK has been by the client, let us close the connection |
| 414 | */ |
| 415 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 416 | /* |
| 417 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 418 | * “If an INIT ACK is received by an endpoint in any state other |
| 419 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 420 | * INIT ACK chunk”. Stay in the same state |
| 421 | */ |
| 422 | {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 423 | /* |
| 424 | * Client resent the ECHO, let us stay in the same state |
| 425 | */ |
| 426 | {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 427 | /* |
| 428 | * ECHO received from the server, Not sure what to do, |
| 429 | * let us close it |
| 430 | */ |
| 431 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 432 | /* |
| 433 | * COOKIE ACK from client, this shoud not happen, let's close the |
| 434 | * connection |
| 435 | */ |
| 436 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 437 | /* |
| 438 | * COOKIE ACK from server, this is what we are awaiting,lets move to |
| 439 | * ESTABLISHED. |
| 440 | */ |
| 441 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 442 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 443 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 444 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 445 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 446 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 447 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 448 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 449 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 450 | }, |
| 451 | /* |
| 452 | * State : IP_VS_SCTP_S_ECHO_SER |
| 453 | * Server sent ECHO and waiting COOKEI ACK from the client |
| 454 | */ |
| 455 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 456 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 457 | /* |
| 458 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 459 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 460 | * an INIT ACK using the same parameters it sent in its original |
| 461 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 462 | */ |
| 463 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 464 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 465 | /* |
| 466 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 467 | * “If an INIT ACK is received by an endpoint in any state other |
| 468 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 469 | * INIT ACK chunk”. Stay in the same state |
| 470 | */ |
| 471 | {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 472 | /* |
| 473 | * INIT_ACK has been by the server, let us close the connection |
| 474 | */ |
| 475 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 476 | /* |
| 477 | * Client sent the ECHO, not sure what to do, let's close the |
| 478 | * connection. |
| 479 | */ |
| 480 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 481 | /* |
| 482 | * ECHO resent by the server, stay in the same state |
| 483 | */ |
| 484 | {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 485 | /* |
| 486 | * COOKIE ACK from client, this is what we are expecting, let's move |
| 487 | * to ESTABLISHED. |
| 488 | */ |
| 489 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 490 | /* |
| 491 | * COOKIE ACK from server, this should not happen, lets close the |
| 492 | * connection. |
| 493 | */ |
| 494 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 495 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 496 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 497 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 498 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 499 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 500 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 501 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 502 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 503 | }, |
| 504 | /* |
| 505 | * State : IP_VS_SCTP_S_ESTABLISHED |
| 506 | * Association established |
| 507 | */ |
| 508 | {{IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 509 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 510 | /* |
| 511 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 512 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 513 | * an INIT ACK using the same parameters it sent in its original |
| 514 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 515 | */ |
| 516 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 517 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 518 | /* |
| 519 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 520 | * “If an INIT ACK is received by an endpoint in any state other |
| 521 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 522 | * INIT ACK chunk”. Stay in the same state |
| 523 | */ |
| 524 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 525 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 526 | /* |
| 527 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 528 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 529 | * it will send ERROR chunk. So, stay in the same state |
| 530 | */ |
| 531 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 532 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 533 | /* |
| 534 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 535 | */ |
| 536 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 537 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 538 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 539 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 540 | /* |
| 541 | * SHUTDOWN from the client, move to SHUDDOWN_CLI |
| 542 | */ |
| 543 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 544 | /* |
| 545 | * SHUTDOWN from the server, move to SHUTDOWN_SER |
| 546 | */ |
| 547 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 548 | /* |
| 549 | * client sent SHUDTDOWN_ACK, this should not happen, let's close |
| 550 | * the connection |
| 551 | */ |
| 552 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 553 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 554 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 555 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 556 | }, |
| 557 | /* |
| 558 | * State : IP_VS_SCTP_S_SHUT_CLI |
| 559 | * SHUTDOWN sent from the client, waitinf for SHUT ACK from the server |
| 560 | */ |
| 561 | /* |
| 562 | * We recieved the data chuck, keep the state unchanged. I assume |
| 563 | * that still data chuncks can be received by both the peers in |
| 564 | * SHUDOWN state |
| 565 | */ |
| 566 | |
| 567 | {{IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 568 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 569 | /* |
| 570 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 571 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 572 | * an INIT ACK using the same parameters it sent in its original |
| 573 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 574 | */ |
| 575 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 576 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 577 | /* |
| 578 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 579 | * “If an INIT ACK is received by an endpoint in any state other |
| 580 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 581 | * INIT ACK chunk”. Stay in the same state |
| 582 | */ |
| 583 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 584 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 585 | /* |
| 586 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 587 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 588 | * it will send ERROR chunk. So, stay in the same state |
| 589 | */ |
| 590 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 591 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 592 | /* |
| 593 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 594 | */ |
| 595 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 596 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 597 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 598 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 599 | /* |
| 600 | * SHUTDOWN resent from the client, move to SHUDDOWN_CLI |
| 601 | */ |
| 602 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 603 | /* |
| 604 | * SHUTDOWN from the server, move to SHUTDOWN_SER |
| 605 | */ |
| 606 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 607 | /* |
| 608 | * client sent SHUDTDOWN_ACK, this should not happen, let's close |
| 609 | * the connection |
| 610 | */ |
| 611 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 612 | /* |
| 613 | * Server sent SHUTDOWN ACK, this is what we are expecting, let's move |
| 614 | * to SHUDOWN_ACK_SER |
| 615 | */ |
| 616 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 617 | /* |
| 618 | * SHUTDOWN COM from client, this should not happen, let's close the |
| 619 | * connection |
| 620 | */ |
| 621 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 622 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 623 | }, |
| 624 | /* |
| 625 | * State : IP_VS_SCTP_S_SHUT_SER |
| 626 | * SHUTDOWN sent from the server, waitinf for SHUTDOWN ACK from client |
| 627 | */ |
| 628 | /* |
| 629 | * We recieved the data chuck, keep the state unchanged. I assume |
| 630 | * that still data chuncks can be received by both the peers in |
| 631 | * SHUDOWN state |
| 632 | */ |
| 633 | |
| 634 | {{IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 635 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 636 | /* |
| 637 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 638 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 639 | * an INIT ACK using the same parameters it sent in its original |
| 640 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 641 | */ |
| 642 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 643 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 644 | /* |
| 645 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 646 | * “If an INIT ACK is received by an endpoint in any state other |
| 647 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 648 | * INIT ACK chunk”. Stay in the same state |
| 649 | */ |
| 650 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 651 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 652 | /* |
| 653 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 654 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 655 | * it will send ERROR chunk. So, stay in the same state |
| 656 | */ |
| 657 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 658 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 659 | /* |
| 660 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 661 | */ |
| 662 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 663 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 664 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 665 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 666 | /* |
| 667 | * SHUTDOWN resent from the client, move to SHUDDOWN_CLI |
| 668 | */ |
| 669 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 670 | /* |
| 671 | * SHUTDOWN resent from the server, move to SHUTDOWN_SER |
| 672 | */ |
| 673 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 674 | /* |
| 675 | * client sent SHUDTDOWN_ACK, this is what we are expecting, let's |
| 676 | * move to SHUT_ACK_CLI |
| 677 | */ |
| 678 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 679 | /* |
| 680 | * Server sent SHUTDOWN ACK, this should not happen, let's close the |
| 681 | * connection |
| 682 | */ |
| 683 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 684 | /* |
| 685 | * SHUTDOWN COM from client, this should not happen, let's close the |
| 686 | * connection |
| 687 | */ |
| 688 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 689 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 690 | }, |
| 691 | |
| 692 | /* |
| 693 | * State : IP_VS_SCTP_S_SHUT_ACK_CLI |
| 694 | * SHUTDOWN ACK from the client, awaiting for SHUTDOWN COM from server |
| 695 | */ |
| 696 | /* |
| 697 | * We recieved the data chuck, keep the state unchanged. I assume |
| 698 | * that still data chuncks can be received by both the peers in |
| 699 | * SHUDOWN state |
| 700 | */ |
| 701 | |
| 702 | {{IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 703 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 704 | /* |
| 705 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 706 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 707 | * an INIT ACK using the same parameters it sent in its original |
| 708 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 709 | */ |
| 710 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 711 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 712 | /* |
| 713 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 714 | * “If an INIT ACK is received by an endpoint in any state other |
| 715 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 716 | * INIT ACK chunk”. Stay in the same state |
| 717 | */ |
| 718 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 719 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 720 | /* |
| 721 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 722 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 723 | * it will send ERROR chunk. So, stay in the same state |
| 724 | */ |
| 725 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 726 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 727 | /* |
| 728 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 729 | */ |
| 730 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 731 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 732 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 733 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 734 | /* |
| 735 | * SHUTDOWN sent from the client, move to SHUDDOWN_CLI |
| 736 | */ |
| 737 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 738 | /* |
| 739 | * SHUTDOWN sent from the server, move to SHUTDOWN_SER |
| 740 | */ |
| 741 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 742 | /* |
| 743 | * client resent SHUDTDOWN_ACK, let's stay in the same state |
| 744 | */ |
| 745 | {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 746 | /* |
| 747 | * Server sent SHUTDOWN ACK, this should not happen, let's close the |
| 748 | * connection |
| 749 | */ |
| 750 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 751 | /* |
| 752 | * SHUTDOWN COM from client, this should not happen, let's close the |
| 753 | * connection |
| 754 | */ |
| 755 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 756 | /* |
| 757 | * SHUTDOWN COMPLETE from server this is what we are expecting. |
| 758 | */ |
| 759 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 760 | }, |
| 761 | |
| 762 | /* |
| 763 | * State : IP_VS_SCTP_S_SHUT_ACK_SER |
| 764 | * SHUTDOWN ACK from the server, awaiting for SHUTDOWN COM from client |
| 765 | */ |
| 766 | /* |
| 767 | * We recieved the data chuck, keep the state unchanged. I assume |
| 768 | * that still data chuncks can be received by both the peers in |
| 769 | * SHUDOWN state |
| 770 | */ |
| 771 | |
| 772 | {{IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 773 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 774 | /* |
| 775 | * We have got an INIT from client. From the spec.“Upon receipt of |
| 776 | * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| 777 | * an INIT ACK using the same parameters it sent in its original |
| 778 | * INIT chunk (including its Initiate Tag, unchanged”). |
| 779 | */ |
| 780 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 781 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 782 | /* |
| 783 | * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| 784 | * “If an INIT ACK is received by an endpoint in any state other |
| 785 | * than the COOKIE-WAIT state, the endpoint should discard the |
| 786 | * INIT ACK chunk”. Stay in the same state |
| 787 | */ |
| 788 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 789 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 790 | /* |
| 791 | * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| 792 | * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| 793 | * it will send ERROR chunk. So, stay in the same state |
| 794 | */ |
| 795 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 796 | {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 797 | /* |
| 798 | * COOKIE ACK from client, not sure what to do stay in the same state |
| 799 | */ |
| 800 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 801 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 802 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 803 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 804 | /* |
| 805 | * SHUTDOWN sent from the client, move to SHUDDOWN_CLI |
| 806 | */ |
| 807 | {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 808 | /* |
| 809 | * SHUTDOWN sent from the server, move to SHUTDOWN_SER |
| 810 | */ |
| 811 | {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 812 | /* |
| 813 | * client sent SHUDTDOWN_ACK, this should not happen let's close |
| 814 | * the connection. |
| 815 | */ |
| 816 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 817 | /* |
| 818 | * Server resent SHUTDOWN ACK, stay in the same state |
| 819 | */ |
| 820 | {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 821 | /* |
| 822 | * SHUTDOWN COM from client, this what we are expecting, let's close |
| 823 | * the connection |
| 824 | */ |
| 825 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 826 | /* |
| 827 | * SHUTDOWN COMPLETE from server this should not happen. |
| 828 | */ |
| 829 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 830 | }, |
| 831 | /* |
| 832 | * State : IP_VS_SCTP_S_CLOSED |
| 833 | */ |
| 834 | {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| 835 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| 836 | {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| 837 | {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| 838 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| 839 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| 840 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| 841 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| 842 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| 843 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| 844 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| 845 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| 846 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| 847 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| 848 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| 849 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| 850 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| 851 | {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| 852 | } |
| 853 | }; |
| 854 | |
| 855 | /* |
| 856 | * Timeout table[state] |
| 857 | */ |
| 858 | static int sctp_timeouts[IP_VS_SCTP_S_LAST + 1] = { |
| 859 | [IP_VS_SCTP_S_NONE] = 2 * HZ, |
| 860 | [IP_VS_SCTP_S_INIT_CLI] = 1 * 60 * HZ, |
| 861 | [IP_VS_SCTP_S_INIT_SER] = 1 * 60 * HZ, |
| 862 | [IP_VS_SCTP_S_INIT_ACK_CLI] = 1 * 60 * HZ, |
| 863 | [IP_VS_SCTP_S_INIT_ACK_SER] = 1 * 60 * HZ, |
| 864 | [IP_VS_SCTP_S_ECHO_CLI] = 1 * 60 * HZ, |
| 865 | [IP_VS_SCTP_S_ECHO_SER] = 1 * 60 * HZ, |
| 866 | [IP_VS_SCTP_S_ESTABLISHED] = 15 * 60 * HZ, |
| 867 | [IP_VS_SCTP_S_SHUT_CLI] = 1 * 60 * HZ, |
| 868 | [IP_VS_SCTP_S_SHUT_SER] = 1 * 60 * HZ, |
| 869 | [IP_VS_SCTP_S_SHUT_ACK_CLI] = 1 * 60 * HZ, |
| 870 | [IP_VS_SCTP_S_SHUT_ACK_SER] = 1 * 60 * HZ, |
| 871 | [IP_VS_SCTP_S_CLOSED] = 10 * HZ, |
| 872 | [IP_VS_SCTP_S_LAST] = 2 * HZ, |
| 873 | }; |
| 874 | |
| 875 | static const char *sctp_state_name_table[IP_VS_SCTP_S_LAST + 1] = { |
| 876 | [IP_VS_SCTP_S_NONE] = "NONE", |
| 877 | [IP_VS_SCTP_S_INIT_CLI] = "INIT_CLI", |
| 878 | [IP_VS_SCTP_S_INIT_SER] = "INIT_SER", |
| 879 | [IP_VS_SCTP_S_INIT_ACK_CLI] = "INIT_ACK_CLI", |
| 880 | [IP_VS_SCTP_S_INIT_ACK_SER] = "INIT_ACK_SER", |
| 881 | [IP_VS_SCTP_S_ECHO_CLI] = "COOKIE_ECHO_CLI", |
| 882 | [IP_VS_SCTP_S_ECHO_SER] = "COOKIE_ECHO_SER", |
| 883 | [IP_VS_SCTP_S_ESTABLISHED] = "ESTABISHED", |
| 884 | [IP_VS_SCTP_S_SHUT_CLI] = "SHUTDOWN_CLI", |
| 885 | [IP_VS_SCTP_S_SHUT_SER] = "SHUTDOWN_SER", |
| 886 | [IP_VS_SCTP_S_SHUT_ACK_CLI] = "SHUTDOWN_ACK_CLI", |
| 887 | [IP_VS_SCTP_S_SHUT_ACK_SER] = "SHUTDOWN_ACK_SER", |
| 888 | [IP_VS_SCTP_S_CLOSED] = "CLOSED", |
| 889 | [IP_VS_SCTP_S_LAST] = "BUG!" |
| 890 | }; |
| 891 | |
| 892 | |
| 893 | static const char *sctp_state_name(int state) |
| 894 | { |
| 895 | if (state >= IP_VS_SCTP_S_LAST) |
| 896 | return "ERR!"; |
| 897 | if (sctp_state_name_table[state]) |
| 898 | return sctp_state_name_table[state]; |
| 899 | return "?"; |
| 900 | } |
| 901 | |
| 902 | static void sctp_timeout_change(struct ip_vs_protocol *pp, int flags) |
| 903 | { |
| 904 | } |
| 905 | |
| 906 | static int |
| 907 | sctp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to) |
| 908 | { |
| 909 | |
| 910 | return ip_vs_set_state_timeout(pp->timeout_table, IP_VS_SCTP_S_LAST, |
| 911 | sctp_state_name_table, sname, to); |
| 912 | } |
| 913 | |
| 914 | static inline int |
| 915 | set_sctp_state(struct ip_vs_protocol *pp, struct ip_vs_conn *cp, |
| 916 | int direction, const struct sk_buff *skb) |
| 917 | { |
| 918 | sctp_chunkhdr_t _sctpch, *sch; |
| 919 | unsigned char chunk_type; |
| 920 | int event, next_state; |
| 921 | int ihl; |
| 922 | |
| 923 | #ifdef CONFIG_IP_VS_IPV6 |
| 924 | ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr); |
| 925 | #else |
| 926 | ihl = ip_hdrlen(skb); |
| 927 | #endif |
| 928 | |
| 929 | sch = skb_header_pointer(skb, ihl + sizeof(sctp_sctphdr_t), |
| 930 | sizeof(_sctpch), &_sctpch); |
| 931 | if (sch == NULL) |
| 932 | return 0; |
| 933 | |
| 934 | chunk_type = sch->type; |
| 935 | /* |
| 936 | * Section 3: Multiple chunks can be bundled into one SCTP packet |
| 937 | * up to the MTU size, except for the INIT, INIT ACK, and |
| 938 | * SHUTDOWN COMPLETE chunks. These chunks MUST NOT be bundled with |
| 939 | * any other chunk in a packet. |
| 940 | * |
| 941 | * Section 3.3.7: DATA chunks MUST NOT be bundled with ABORT. Control |
| 942 | * chunks (except for INIT, INIT ACK, and SHUTDOWN COMPLETE) MAY be |
| 943 | * bundled with an ABORT, but they MUST be placed before the ABORT |
| 944 | * in the SCTP packet or they will be ignored by the receiver. |
| 945 | */ |
| 946 | if ((sch->type == SCTP_CID_COOKIE_ECHO) || |
| 947 | (sch->type == SCTP_CID_COOKIE_ACK)) { |
| 948 | sch = skb_header_pointer(skb, (ihl + sizeof(sctp_sctphdr_t) + |
| 949 | sch->length), sizeof(_sctpch), &_sctpch); |
| 950 | if (sch) { |
| 951 | if (sch->type == SCTP_CID_ABORT) |
| 952 | chunk_type = sch->type; |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | event = sctp_events[chunk_type]; |
| 957 | |
| 958 | /* |
| 959 | * If the direction is IP_VS_DIR_OUTPUT, this event is from server |
| 960 | */ |
| 961 | if (direction == IP_VS_DIR_OUTPUT) |
| 962 | event++; |
| 963 | /* |
| 964 | * get next state |
| 965 | */ |
| 966 | next_state = sctp_states_table[cp->state][event].next_state; |
| 967 | |
| 968 | if (next_state != cp->state) { |
| 969 | struct ip_vs_dest *dest = cp->dest; |
| 970 | |
| 971 | IP_VS_DBG_BUF(8, "%s %s %s:%d->" |
| 972 | "%s:%d state: %s->%s conn->refcnt:%d\n", |
| 973 | pp->name, |
| 974 | ((direction == IP_VS_DIR_OUTPUT) ? |
| 975 | "output " : "input "), |
| 976 | IP_VS_DBG_ADDR(cp->af, &cp->daddr), |
| 977 | ntohs(cp->dport), |
| 978 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| 979 | ntohs(cp->cport), |
| 980 | sctp_state_name(cp->state), |
| 981 | sctp_state_name(next_state), |
| 982 | atomic_read(&cp->refcnt)); |
| 983 | if (dest) { |
| 984 | if (!(cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 985 | (next_state != IP_VS_SCTP_S_ESTABLISHED)) { |
| 986 | atomic_dec(&dest->activeconns); |
| 987 | atomic_inc(&dest->inactconns); |
| 988 | cp->flags |= IP_VS_CONN_F_INACTIVE; |
| 989 | } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) && |
| 990 | (next_state == IP_VS_SCTP_S_ESTABLISHED)) { |
| 991 | atomic_inc(&dest->activeconns); |
| 992 | atomic_dec(&dest->inactconns); |
| 993 | cp->flags &= ~IP_VS_CONN_F_INACTIVE; |
| 994 | } |
| 995 | } |
| 996 | } |
| 997 | |
| 998 | cp->timeout = pp->timeout_table[cp->state = next_state]; |
| 999 | |
| 1000 | return 1; |
| 1001 | } |
| 1002 | |
| 1003 | static int |
| 1004 | sctp_state_transition(struct ip_vs_conn *cp, int direction, |
| 1005 | const struct sk_buff *skb, struct ip_vs_protocol *pp) |
| 1006 | { |
| 1007 | int ret = 0; |
| 1008 | |
| 1009 | spin_lock(&cp->lock); |
| 1010 | ret = set_sctp_state(pp, cp, direction, skb); |
| 1011 | spin_unlock(&cp->lock); |
| 1012 | |
| 1013 | return ret; |
| 1014 | } |
| 1015 | |
| 1016 | /* |
| 1017 | * Hash table for SCTP application incarnations |
| 1018 | */ |
| 1019 | #define SCTP_APP_TAB_BITS 4 |
| 1020 | #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) |
| 1021 | #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) |
| 1022 | |
| 1023 | static struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; |
| 1024 | static DEFINE_SPINLOCK(sctp_app_lock); |
| 1025 | |
| 1026 | static inline __u16 sctp_app_hashkey(__be16 port) |
| 1027 | { |
| 1028 | return (((__force u16)port >> SCTP_APP_TAB_BITS) ^ (__force u16)port) |
| 1029 | & SCTP_APP_TAB_MASK; |
| 1030 | } |
| 1031 | |
| 1032 | static int sctp_register_app(struct ip_vs_app *inc) |
| 1033 | { |
| 1034 | struct ip_vs_app *i; |
| 1035 | __u16 hash; |
| 1036 | __be16 port = inc->port; |
| 1037 | int ret = 0; |
| 1038 | |
| 1039 | hash = sctp_app_hashkey(port); |
| 1040 | |
| 1041 | spin_lock_bh(&sctp_app_lock); |
| 1042 | list_for_each_entry(i, &sctp_apps[hash], p_list) { |
| 1043 | if (i->port == port) { |
| 1044 | ret = -EEXIST; |
| 1045 | goto out; |
| 1046 | } |
| 1047 | } |
| 1048 | list_add(&inc->p_list, &sctp_apps[hash]); |
| 1049 | atomic_inc(&ip_vs_protocol_sctp.appcnt); |
| 1050 | out: |
| 1051 | spin_unlock_bh(&sctp_app_lock); |
| 1052 | |
| 1053 | return ret; |
| 1054 | } |
| 1055 | |
| 1056 | static void sctp_unregister_app(struct ip_vs_app *inc) |
| 1057 | { |
| 1058 | spin_lock_bh(&sctp_app_lock); |
| 1059 | atomic_dec(&ip_vs_protocol_sctp.appcnt); |
| 1060 | list_del(&inc->p_list); |
| 1061 | spin_unlock_bh(&sctp_app_lock); |
| 1062 | } |
| 1063 | |
| 1064 | static int sctp_app_conn_bind(struct ip_vs_conn *cp) |
| 1065 | { |
| 1066 | int hash; |
| 1067 | struct ip_vs_app *inc; |
| 1068 | int result = 0; |
| 1069 | |
| 1070 | /* Default binding: bind app only for NAT */ |
| 1071 | if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) |
| 1072 | return 0; |
| 1073 | /* Lookup application incarnations and bind the right one */ |
| 1074 | hash = sctp_app_hashkey(cp->vport); |
| 1075 | |
| 1076 | spin_lock(&sctp_app_lock); |
| 1077 | list_for_each_entry(inc, &sctp_apps[hash], p_list) { |
| 1078 | if (inc->port == cp->vport) { |
| 1079 | if (unlikely(!ip_vs_app_inc_get(inc))) |
| 1080 | break; |
| 1081 | spin_unlock(&sctp_app_lock); |
| 1082 | |
| 1083 | IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->" |
| 1084 | "%s:%u to app %s on port %u\n", |
| 1085 | __func__, |
| 1086 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| 1087 | ntohs(cp->cport), |
| 1088 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
| 1089 | ntohs(cp->vport), |
| 1090 | inc->name, ntohs(inc->port)); |
| 1091 | cp->app = inc; |
| 1092 | if (inc->init_conn) |
| 1093 | result = inc->init_conn(inc, cp); |
| 1094 | goto out; |
| 1095 | } |
| 1096 | } |
| 1097 | spin_unlock(&sctp_app_lock); |
| 1098 | out: |
| 1099 | return result; |
| 1100 | } |
| 1101 | |
| 1102 | static void ip_vs_sctp_init(struct ip_vs_protocol *pp) |
| 1103 | { |
| 1104 | IP_VS_INIT_HASH_TABLE(sctp_apps); |
| 1105 | pp->timeout_table = sctp_timeouts; |
| 1106 | } |
| 1107 | |
| 1108 | |
| 1109 | static void ip_vs_sctp_exit(struct ip_vs_protocol *pp) |
| 1110 | { |
| 1111 | |
| 1112 | } |
| 1113 | |
| 1114 | struct ip_vs_protocol ip_vs_protocol_sctp = { |
| 1115 | .name = "SCTP", |
| 1116 | .protocol = IPPROTO_SCTP, |
| 1117 | .num_states = IP_VS_SCTP_S_LAST, |
| 1118 | .dont_defrag = 0, |
| 1119 | .appcnt = ATOMIC_INIT(0), |
| 1120 | .init = ip_vs_sctp_init, |
| 1121 | .exit = ip_vs_sctp_exit, |
| 1122 | .register_app = sctp_register_app, |
| 1123 | .unregister_app = sctp_unregister_app, |
| 1124 | .conn_schedule = sctp_conn_schedule, |
Simon Horman | 5c0d237 | 2010-08-02 17:12:44 +0200 | [diff] [blame] | 1125 | .conn_in_get = ip_vs_conn_in_get_proto, |
| 1126 | .conn_out_get = ip_vs_conn_out_get_proto, |
Venkata Mohan Reddy | 2906f66 | 2010-02-18 12:31:05 +0100 | [diff] [blame] | 1127 | .snat_handler = sctp_snat_handler, |
| 1128 | .dnat_handler = sctp_dnat_handler, |
| 1129 | .csum_check = sctp_csum_check, |
| 1130 | .state_name = sctp_state_name, |
| 1131 | .state_transition = sctp_state_transition, |
| 1132 | .app_conn_bind = sctp_app_conn_bind, |
| 1133 | .debug_packet = ip_vs_tcpudp_debug_packet, |
| 1134 | .timeout_change = sctp_timeout_change, |
| 1135 | .set_state_timeout = sctp_set_state_timeout, |
| 1136 | }; |