| #include <linux/kernel.h> |
| #include <linux/ip.h> |
| #include <linux/sctp.h> |
| #include <net/ip.h> |
| #include <net/ip6_checksum.h> |
| #include <linux/netfilter.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <net/sctp/checksum.h> |
| #include <net/ip_vs.h> |
| |
| static int |
| sctp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_protocol *pp, |
| int *verdict, struct ip_vs_conn **cpp) |
| { |
| struct ip_vs_service *svc; |
| sctp_chunkhdr_t _schunkh, *sch; |
| sctp_sctphdr_t *sh, _sctph; |
| struct ip_vs_iphdr iph; |
| |
| ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
| |
| sh = skb_header_pointer(skb, iph.len, sizeof(_sctph), &_sctph); |
| if (sh == NULL) |
| return 0; |
| |
| sch = skb_header_pointer(skb, iph.len + sizeof(sctp_sctphdr_t), |
| sizeof(_schunkh), &_schunkh); |
| if (sch == NULL) |
| return 0; |
| |
| if ((sch->type == SCTP_CID_INIT) && |
| (svc = ip_vs_service_get(af, skb->mark, iph.protocol, |
| &iph.daddr, sh->dest))) { |
| int ignored; |
| |
| if (ip_vs_todrop()) { |
| /* |
| * It seems that we are very loaded. |
| * We have to drop this packet :( |
| */ |
| ip_vs_service_put(svc); |
| *verdict = NF_DROP; |
| return 0; |
| } |
| /* |
| * Let the virtual server select a real server for the |
| * incoming connection, and create a connection entry. |
| */ |
| *cpp = ip_vs_schedule(svc, skb, pp, &ignored); |
| if (!*cpp && !ignored) { |
| *verdict = ip_vs_leave(svc, skb, pp); |
| return 0; |
| } |
| ip_vs_service_put(svc); |
| } |
| |
| return 1; |
| } |
| |
| static int |
| sctp_snat_handler(struct sk_buff *skb, |
| struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| { |
| sctp_sctphdr_t *sctph; |
| unsigned int sctphoff; |
| struct sk_buff *iter; |
| __be32 crc32; |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (cp->af == AF_INET6) |
| sctphoff = sizeof(struct ipv6hdr); |
| else |
| #endif |
| sctphoff = ip_hdrlen(skb); |
| |
| /* csum_check requires unshared skb */ |
| if (!skb_make_writable(skb, sctphoff + sizeof(*sctph))) |
| return 0; |
| |
| if (unlikely(cp->app != NULL)) { |
| /* Some checks before mangling */ |
| if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
| return 0; |
| |
| /* Call application helper if needed */ |
| if (!ip_vs_app_pkt_out(cp, skb)) |
| return 0; |
| } |
| |
| sctph = (void *) skb_network_header(skb) + sctphoff; |
| sctph->source = cp->vport; |
| |
| /* Calculate the checksum */ |
| crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff); |
| skb_walk_frags(skb, iter) |
| crc32 = sctp_update_cksum((u8 *) iter->data, skb_headlen(iter), |
| crc32); |
| crc32 = sctp_end_cksum(crc32); |
| sctph->checksum = crc32; |
| |
| return 1; |
| } |
| |
| static int |
| sctp_dnat_handler(struct sk_buff *skb, |
| struct ip_vs_protocol *pp, struct ip_vs_conn *cp) |
| { |
| sctp_sctphdr_t *sctph; |
| unsigned int sctphoff; |
| struct sk_buff *iter; |
| __be32 crc32; |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (cp->af == AF_INET6) |
| sctphoff = sizeof(struct ipv6hdr); |
| else |
| #endif |
| sctphoff = ip_hdrlen(skb); |
| |
| /* csum_check requires unshared skb */ |
| if (!skb_make_writable(skb, sctphoff + sizeof(*sctph))) |
| return 0; |
| |
| if (unlikely(cp->app != NULL)) { |
| /* Some checks before mangling */ |
| if (pp->csum_check && !pp->csum_check(cp->af, skb, pp)) |
| return 0; |
| |
| /* Call application helper if needed */ |
| if (!ip_vs_app_pkt_in(cp, skb)) |
| return 0; |
| } |
| |
| sctph = (void *) skb_network_header(skb) + sctphoff; |
| sctph->dest = cp->dport; |
| |
| /* Calculate the checksum */ |
| crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff); |
| skb_walk_frags(skb, iter) |
| crc32 = sctp_update_cksum((u8 *) iter->data, skb_headlen(iter), |
| crc32); |
| crc32 = sctp_end_cksum(crc32); |
| sctph->checksum = crc32; |
| |
| return 1; |
| } |
| |
| static int |
| sctp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp) |
| { |
| unsigned int sctphoff; |
| struct sctphdr *sh, _sctph; |
| struct sk_buff *iter; |
| __le32 cmp; |
| __le32 val; |
| __u32 tmp; |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (af == AF_INET6) |
| sctphoff = sizeof(struct ipv6hdr); |
| else |
| #endif |
| sctphoff = ip_hdrlen(skb); |
| |
| sh = skb_header_pointer(skb, sctphoff, sizeof(_sctph), &_sctph); |
| if (sh == NULL) |
| return 0; |
| |
| cmp = sh->checksum; |
| |
| tmp = sctp_start_cksum((__u8 *) sh, skb_headlen(skb)); |
| skb_walk_frags(skb, iter) |
| tmp = sctp_update_cksum((__u8 *) iter->data, |
| skb_headlen(iter), tmp); |
| |
| val = sctp_end_cksum(tmp); |
| |
| if (val != cmp) { |
| /* CRC failure, dump it. */ |
| IP_VS_DBG_RL_PKT(0, af, pp, skb, 0, |
| "Failed checksum for"); |
| return 0; |
| } |
| return 1; |
| } |
| |
| struct ipvs_sctp_nextstate { |
| int next_state; |
| }; |
| enum ipvs_sctp_event_t { |
| IP_VS_SCTP_EVE_DATA_CLI, |
| IP_VS_SCTP_EVE_DATA_SER, |
| IP_VS_SCTP_EVE_INIT_CLI, |
| IP_VS_SCTP_EVE_INIT_SER, |
| IP_VS_SCTP_EVE_INIT_ACK_CLI, |
| IP_VS_SCTP_EVE_INIT_ACK_SER, |
| IP_VS_SCTP_EVE_COOKIE_ECHO_CLI, |
| IP_VS_SCTP_EVE_COOKIE_ECHO_SER, |
| IP_VS_SCTP_EVE_COOKIE_ACK_CLI, |
| IP_VS_SCTP_EVE_COOKIE_ACK_SER, |
| IP_VS_SCTP_EVE_ABORT_CLI, |
| IP_VS_SCTP_EVE__ABORT_SER, |
| IP_VS_SCTP_EVE_SHUT_CLI, |
| IP_VS_SCTP_EVE_SHUT_SER, |
| IP_VS_SCTP_EVE_SHUT_ACK_CLI, |
| IP_VS_SCTP_EVE_SHUT_ACK_SER, |
| IP_VS_SCTP_EVE_SHUT_COM_CLI, |
| IP_VS_SCTP_EVE_SHUT_COM_SER, |
| IP_VS_SCTP_EVE_LAST |
| }; |
| |
| static enum ipvs_sctp_event_t sctp_events[255] = { |
| IP_VS_SCTP_EVE_DATA_CLI, |
| IP_VS_SCTP_EVE_INIT_CLI, |
| IP_VS_SCTP_EVE_INIT_ACK_CLI, |
| IP_VS_SCTP_EVE_DATA_CLI, |
| IP_VS_SCTP_EVE_DATA_CLI, |
| IP_VS_SCTP_EVE_DATA_CLI, |
| IP_VS_SCTP_EVE_ABORT_CLI, |
| IP_VS_SCTP_EVE_SHUT_CLI, |
| IP_VS_SCTP_EVE_SHUT_ACK_CLI, |
| IP_VS_SCTP_EVE_DATA_CLI, |
| IP_VS_SCTP_EVE_COOKIE_ECHO_CLI, |
| IP_VS_SCTP_EVE_COOKIE_ACK_CLI, |
| IP_VS_SCTP_EVE_DATA_CLI, |
| IP_VS_SCTP_EVE_DATA_CLI, |
| IP_VS_SCTP_EVE_SHUT_COM_CLI, |
| }; |
| |
| static struct ipvs_sctp_nextstate |
| sctp_states_table[IP_VS_SCTP_S_LAST][IP_VS_SCTP_EVE_LAST] = { |
| /* |
| * STATE : IP_VS_SCTP_S_NONE |
| */ |
| /*next state *//*event */ |
| {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ }, |
| }, |
| /* |
| * STATE : IP_VS_SCTP_S_INIT_CLI |
| * Cient sent INIT and is waiting for reply from server(In ECHO_WAIT) |
| */ |
| {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ECHO_CLI */ }, |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_ECHO_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| /* |
| * State : IP_VS_SCTP_S_INIT_SER |
| * Server sent INIT and waiting for INIT ACK from the client |
| */ |
| {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| /* |
| * State : IP_VS_SCTP_S_INIT_ACK_CLI |
| * Client sent INIT ACK and waiting for ECHO from the server |
| */ |
| {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| /* |
| * We have got an INIT from client. From the spec.“Upon receipt of |
| * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| * an INIT ACK using the same parameters it sent in its original |
| * INIT chunk (including its Initiate Tag, unchanged”). |
| */ |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| /* |
| * INIT_ACK has been resent by the client, let us stay is in |
| * the same state |
| */ |
| {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| /* |
| * INIT_ACK sent by the server, close the connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| /* |
| * ECHO by client, it should not happen, close the connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| /* |
| * ECHO by server, this is what we are expecting, move to ECHO_SER |
| */ |
| {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| /* |
| * COOKIE ACK from client, it should not happen, close the connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| /* |
| * Unexpected COOKIE ACK from server, staty in the same state |
| */ |
| {IP_VS_SCTP_S_INIT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| /* |
| * State : IP_VS_SCTP_S_INIT_ACK_SER |
| * Server sent INIT ACK and waiting for ECHO from the client |
| */ |
| {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| /* |
| * We have got an INIT from client. From the spec.“Upon receipt of |
| * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| * an INIT ACK using the same parameters it sent in its original |
| * INIT chunk (including its Initiate Tag, unchanged”). |
| */ |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| /* |
| * Unexpected INIT_ACK by the client, let us close the connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| /* |
| * INIT_ACK resent by the server, let us move to same state |
| */ |
| {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| /* |
| * Client send the ECHO, this is what we are expecting, |
| * move to ECHO_CLI |
| */ |
| {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| /* |
| * ECHO received from the server, Not sure what to do, |
| * let us close it |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| /* |
| * COOKIE ACK from client, let us stay in the same state |
| */ |
| {IP_VS_SCTP_S_INIT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| /* |
| * COOKIE ACK from server, hmm... this should not happen, lets close |
| * the connection. |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| /* |
| * State : IP_VS_SCTP_S_ECHO_CLI |
| * Cient sent ECHO and waiting COOKEI ACK from the Server |
| */ |
| {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| /* |
| * We have got an INIT from client. From the spec.“Upon receipt of |
| * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| * an INIT ACK using the same parameters it sent in its original |
| * INIT chunk (including its Initiate Tag, unchanged”). |
| */ |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| /* |
| * INIT_ACK has been by the client, let us close the connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| /* |
| * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| * “If an INIT ACK is received by an endpoint in any state other |
| * than the COOKIE-WAIT state, the endpoint should discard the |
| * INIT ACK chunk”. Stay in the same state |
| */ |
| {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| /* |
| * Client resent the ECHO, let us stay in the same state |
| */ |
| {IP_VS_SCTP_S_ECHO_CLI /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| /* |
| * ECHO received from the server, Not sure what to do, |
| * let us close it |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| /* |
| * COOKIE ACK from client, this shoud not happen, let's close the |
| * connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| /* |
| * COOKIE ACK from server, this is what we are awaiting,lets move to |
| * ESTABLISHED. |
| */ |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| /* |
| * State : IP_VS_SCTP_S_ECHO_SER |
| * Server sent ECHO and waiting COOKEI ACK from the client |
| */ |
| {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| /* |
| * We have got an INIT from client. From the spec.“Upon receipt of |
| * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| * an INIT ACK using the same parameters it sent in its original |
| * INIT chunk (including its Initiate Tag, unchanged”). |
| */ |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| /* |
| * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| * “If an INIT ACK is received by an endpoint in any state other |
| * than the COOKIE-WAIT state, the endpoint should discard the |
| * INIT ACK chunk”. Stay in the same state |
| */ |
| {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| /* |
| * INIT_ACK has been by the server, let us close the connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| /* |
| * Client sent the ECHO, not sure what to do, let's close the |
| * connection. |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| /* |
| * ECHO resent by the server, stay in the same state |
| */ |
| {IP_VS_SCTP_S_ECHO_SER /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| /* |
| * COOKIE ACK from client, this is what we are expecting, let's move |
| * to ESTABLISHED. |
| */ |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| /* |
| * COOKIE ACK from server, this should not happen, lets close the |
| * connection. |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| /* |
| * State : IP_VS_SCTP_S_ESTABLISHED |
| * Association established |
| */ |
| {{IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| /* |
| * We have got an INIT from client. From the spec.“Upon receipt of |
| * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| * an INIT ACK using the same parameters it sent in its original |
| * INIT chunk (including its Initiate Tag, unchanged”). |
| */ |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| /* |
| * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| * “If an INIT ACK is received by an endpoint in any state other |
| * than the COOKIE-WAIT state, the endpoint should discard the |
| * INIT ACK chunk”. Stay in the same state |
| */ |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| /* |
| * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| * it will send ERROR chunk. So, stay in the same state |
| */ |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| /* |
| * COOKIE ACK from client, not sure what to do stay in the same state |
| */ |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| /* |
| * SHUTDOWN from the client, move to SHUDDOWN_CLI |
| */ |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| /* |
| * SHUTDOWN from the server, move to SHUTDOWN_SER |
| */ |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| /* |
| * client sent SHUDTDOWN_ACK, this should not happen, let's close |
| * the connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| /* |
| * State : IP_VS_SCTP_S_SHUT_CLI |
| * SHUTDOWN sent from the client, waitinf for SHUT ACK from the server |
| */ |
| /* |
| * We recieved the data chuck, keep the state unchanged. I assume |
| * that still data chuncks can be received by both the peers in |
| * SHUDOWN state |
| */ |
| |
| {{IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| /* |
| * We have got an INIT from client. From the spec.“Upon receipt of |
| * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| * an INIT ACK using the same parameters it sent in its original |
| * INIT chunk (including its Initiate Tag, unchanged”). |
| */ |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| /* |
| * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| * “If an INIT ACK is received by an endpoint in any state other |
| * than the COOKIE-WAIT state, the endpoint should discard the |
| * INIT ACK chunk”. Stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| /* |
| * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| * it will send ERROR chunk. So, stay in the same state |
| */ |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| /* |
| * COOKIE ACK from client, not sure what to do stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| /* |
| * SHUTDOWN resent from the client, move to SHUDDOWN_CLI |
| */ |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| /* |
| * SHUTDOWN from the server, move to SHUTDOWN_SER |
| */ |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| /* |
| * client sent SHUDTDOWN_ACK, this should not happen, let's close |
| * the connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| /* |
| * Server sent SHUTDOWN ACK, this is what we are expecting, let's move |
| * to SHUDOWN_ACK_SER |
| */ |
| {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| /* |
| * SHUTDOWN COM from client, this should not happen, let's close the |
| * connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| /* |
| * State : IP_VS_SCTP_S_SHUT_SER |
| * SHUTDOWN sent from the server, waitinf for SHUTDOWN ACK from client |
| */ |
| /* |
| * We recieved the data chuck, keep the state unchanged. I assume |
| * that still data chuncks can be received by both the peers in |
| * SHUDOWN state |
| */ |
| |
| {{IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| /* |
| * We have got an INIT from client. From the spec.“Upon receipt of |
| * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| * an INIT ACK using the same parameters it sent in its original |
| * INIT chunk (including its Initiate Tag, unchanged”). |
| */ |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| /* |
| * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| * “If an INIT ACK is received by an endpoint in any state other |
| * than the COOKIE-WAIT state, the endpoint should discard the |
| * INIT ACK chunk”. Stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| /* |
| * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| * it will send ERROR chunk. So, stay in the same state |
| */ |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| /* |
| * COOKIE ACK from client, not sure what to do stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| /* |
| * SHUTDOWN resent from the client, move to SHUDDOWN_CLI |
| */ |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| /* |
| * SHUTDOWN resent from the server, move to SHUTDOWN_SER |
| */ |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| /* |
| * client sent SHUDTDOWN_ACK, this is what we are expecting, let's |
| * move to SHUT_ACK_CLI |
| */ |
| {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| /* |
| * Server sent SHUTDOWN ACK, this should not happen, let's close the |
| * connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| /* |
| * SHUTDOWN COM from client, this should not happen, let's close the |
| * connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| |
| /* |
| * State : IP_VS_SCTP_S_SHUT_ACK_CLI |
| * SHUTDOWN ACK from the client, awaiting for SHUTDOWN COM from server |
| */ |
| /* |
| * We recieved the data chuck, keep the state unchanged. I assume |
| * that still data chuncks can be received by both the peers in |
| * SHUDOWN state |
| */ |
| |
| {{IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| /* |
| * We have got an INIT from client. From the spec.“Upon receipt of |
| * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| * an INIT ACK using the same parameters it sent in its original |
| * INIT chunk (including its Initiate Tag, unchanged”). |
| */ |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| /* |
| * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| * “If an INIT ACK is received by an endpoint in any state other |
| * than the COOKIE-WAIT state, the endpoint should discard the |
| * INIT ACK chunk”. Stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| /* |
| * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| * it will send ERROR chunk. So, stay in the same state |
| */ |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| /* |
| * COOKIE ACK from client, not sure what to do stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| /* |
| * SHUTDOWN sent from the client, move to SHUDDOWN_CLI |
| */ |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| /* |
| * SHUTDOWN sent from the server, move to SHUTDOWN_SER |
| */ |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| /* |
| * client resent SHUDTDOWN_ACK, let's stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_ACK_CLI /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| /* |
| * Server sent SHUTDOWN ACK, this should not happen, let's close the |
| * connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| /* |
| * SHUTDOWN COM from client, this should not happen, let's close the |
| * connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| /* |
| * SHUTDOWN COMPLETE from server this is what we are expecting. |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| |
| /* |
| * State : IP_VS_SCTP_S_SHUT_ACK_SER |
| * SHUTDOWN ACK from the server, awaiting for SHUTDOWN COM from client |
| */ |
| /* |
| * We recieved the data chuck, keep the state unchanged. I assume |
| * that still data chuncks can be received by both the peers in |
| * SHUDOWN state |
| */ |
| |
| {{IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| /* |
| * We have got an INIT from client. From the spec.“Upon receipt of |
| * an INIT in the COOKIE-WAIT state, an endpoint MUST respond with |
| * an INIT ACK using the same parameters it sent in its original |
| * INIT chunk (including its Initiate Tag, unchanged”). |
| */ |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| /* |
| * INIT_ACK sent by the server, Unexpected INIT ACK, spec says, |
| * “If an INIT ACK is received by an endpoint in any state other |
| * than the COOKIE-WAIT state, the endpoint should discard the |
| * INIT ACK chunk”. Stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| /* |
| * Client sent ECHO, Spec(sec 5.2.4) says it may be handled by the |
| * peer and peer shall move to the ESTABISHED. if it doesn't handle |
| * it will send ERROR chunk. So, stay in the same state |
| */ |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| {IP_VS_SCTP_S_ESTABLISHED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| /* |
| * COOKIE ACK from client, not sure what to do stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| /* |
| * SHUTDOWN sent from the client, move to SHUDDOWN_CLI |
| */ |
| {IP_VS_SCTP_S_SHUT_CLI /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| /* |
| * SHUTDOWN sent from the server, move to SHUTDOWN_SER |
| */ |
| {IP_VS_SCTP_S_SHUT_SER /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| /* |
| * client sent SHUDTDOWN_ACK, this should not happen let's close |
| * the connection. |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| /* |
| * Server resent SHUTDOWN ACK, stay in the same state |
| */ |
| {IP_VS_SCTP_S_SHUT_ACK_SER /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| /* |
| * SHUTDOWN COM from client, this what we are expecting, let's close |
| * the connection |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| /* |
| * SHUTDOWN COMPLETE from server this should not happen. |
| */ |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| }, |
| /* |
| * State : IP_VS_SCTP_S_CLOSED |
| */ |
| {{IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_DATA_SER */ }, |
| {IP_VS_SCTP_S_INIT_CLI /* IP_VS_SCTP_EVE_INIT_CLI */ }, |
| {IP_VS_SCTP_S_INIT_SER /* IP_VS_SCTP_EVE_INIT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_INIT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ECHO_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_COOKIE_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_ABORT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_ACK_SER */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_CLI */ }, |
| {IP_VS_SCTP_S_CLOSED /* IP_VS_SCTP_EVE_SHUT_COM_SER */ } |
| } |
| }; |
| |
| /* |
| * Timeout table[state] |
| */ |
| static int sctp_timeouts[IP_VS_SCTP_S_LAST + 1] = { |
| [IP_VS_SCTP_S_NONE] = 2 * HZ, |
| [IP_VS_SCTP_S_INIT_CLI] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_INIT_SER] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_INIT_ACK_CLI] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_INIT_ACK_SER] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_ECHO_CLI] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_ECHO_SER] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_ESTABLISHED] = 15 * 60 * HZ, |
| [IP_VS_SCTP_S_SHUT_CLI] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_SHUT_SER] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_SHUT_ACK_CLI] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_SHUT_ACK_SER] = 1 * 60 * HZ, |
| [IP_VS_SCTP_S_CLOSED] = 10 * HZ, |
| [IP_VS_SCTP_S_LAST] = 2 * HZ, |
| }; |
| |
| static const char *sctp_state_name_table[IP_VS_SCTP_S_LAST + 1] = { |
| [IP_VS_SCTP_S_NONE] = "NONE", |
| [IP_VS_SCTP_S_INIT_CLI] = "INIT_CLI", |
| [IP_VS_SCTP_S_INIT_SER] = "INIT_SER", |
| [IP_VS_SCTP_S_INIT_ACK_CLI] = "INIT_ACK_CLI", |
| [IP_VS_SCTP_S_INIT_ACK_SER] = "INIT_ACK_SER", |
| [IP_VS_SCTP_S_ECHO_CLI] = "COOKIE_ECHO_CLI", |
| [IP_VS_SCTP_S_ECHO_SER] = "COOKIE_ECHO_SER", |
| [IP_VS_SCTP_S_ESTABLISHED] = "ESTABISHED", |
| [IP_VS_SCTP_S_SHUT_CLI] = "SHUTDOWN_CLI", |
| [IP_VS_SCTP_S_SHUT_SER] = "SHUTDOWN_SER", |
| [IP_VS_SCTP_S_SHUT_ACK_CLI] = "SHUTDOWN_ACK_CLI", |
| [IP_VS_SCTP_S_SHUT_ACK_SER] = "SHUTDOWN_ACK_SER", |
| [IP_VS_SCTP_S_CLOSED] = "CLOSED", |
| [IP_VS_SCTP_S_LAST] = "BUG!" |
| }; |
| |
| |
| static const char *sctp_state_name(int state) |
| { |
| if (state >= IP_VS_SCTP_S_LAST) |
| return "ERR!"; |
| if (sctp_state_name_table[state]) |
| return sctp_state_name_table[state]; |
| return "?"; |
| } |
| |
| static void sctp_timeout_change(struct ip_vs_protocol *pp, int flags) |
| { |
| } |
| |
| static int |
| sctp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to) |
| { |
| |
| return ip_vs_set_state_timeout(pp->timeout_table, IP_VS_SCTP_S_LAST, |
| sctp_state_name_table, sname, to); |
| } |
| |
| static inline int |
| set_sctp_state(struct ip_vs_protocol *pp, struct ip_vs_conn *cp, |
| int direction, const struct sk_buff *skb) |
| { |
| sctp_chunkhdr_t _sctpch, *sch; |
| unsigned char chunk_type; |
| int event, next_state; |
| int ihl; |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr); |
| #else |
| ihl = ip_hdrlen(skb); |
| #endif |
| |
| sch = skb_header_pointer(skb, ihl + sizeof(sctp_sctphdr_t), |
| sizeof(_sctpch), &_sctpch); |
| if (sch == NULL) |
| return 0; |
| |
| chunk_type = sch->type; |
| /* |
| * Section 3: Multiple chunks can be bundled into one SCTP packet |
| * up to the MTU size, except for the INIT, INIT ACK, and |
| * SHUTDOWN COMPLETE chunks. These chunks MUST NOT be bundled with |
| * any other chunk in a packet. |
| * |
| * Section 3.3.7: DATA chunks MUST NOT be bundled with ABORT. Control |
| * chunks (except for INIT, INIT ACK, and SHUTDOWN COMPLETE) MAY be |
| * bundled with an ABORT, but they MUST be placed before the ABORT |
| * in the SCTP packet or they will be ignored by the receiver. |
| */ |
| if ((sch->type == SCTP_CID_COOKIE_ECHO) || |
| (sch->type == SCTP_CID_COOKIE_ACK)) { |
| sch = skb_header_pointer(skb, (ihl + sizeof(sctp_sctphdr_t) + |
| sch->length), sizeof(_sctpch), &_sctpch); |
| if (sch) { |
| if (sch->type == SCTP_CID_ABORT) |
| chunk_type = sch->type; |
| } |
| } |
| |
| event = sctp_events[chunk_type]; |
| |
| /* |
| * If the direction is IP_VS_DIR_OUTPUT, this event is from server |
| */ |
| if (direction == IP_VS_DIR_OUTPUT) |
| event++; |
| /* |
| * get next state |
| */ |
| next_state = sctp_states_table[cp->state][event].next_state; |
| |
| if (next_state != cp->state) { |
| struct ip_vs_dest *dest = cp->dest; |
| |
| IP_VS_DBG_BUF(8, "%s %s %s:%d->" |
| "%s:%d state: %s->%s conn->refcnt:%d\n", |
| pp->name, |
| ((direction == IP_VS_DIR_OUTPUT) ? |
| "output " : "input "), |
| IP_VS_DBG_ADDR(cp->af, &cp->daddr), |
| ntohs(cp->dport), |
| IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| ntohs(cp->cport), |
| sctp_state_name(cp->state), |
| sctp_state_name(next_state), |
| atomic_read(&cp->refcnt)); |
| if (dest) { |
| if (!(cp->flags & IP_VS_CONN_F_INACTIVE) && |
| (next_state != IP_VS_SCTP_S_ESTABLISHED)) { |
| atomic_dec(&dest->activeconns); |
| atomic_inc(&dest->inactconns); |
| cp->flags |= IP_VS_CONN_F_INACTIVE; |
| } else if ((cp->flags & IP_VS_CONN_F_INACTIVE) && |
| (next_state == IP_VS_SCTP_S_ESTABLISHED)) { |
| atomic_inc(&dest->activeconns); |
| atomic_dec(&dest->inactconns); |
| cp->flags &= ~IP_VS_CONN_F_INACTIVE; |
| } |
| } |
| } |
| |
| cp->timeout = pp->timeout_table[cp->state = next_state]; |
| |
| return 1; |
| } |
| |
| static int |
| sctp_state_transition(struct ip_vs_conn *cp, int direction, |
| const struct sk_buff *skb, struct ip_vs_protocol *pp) |
| { |
| int ret = 0; |
| |
| spin_lock(&cp->lock); |
| ret = set_sctp_state(pp, cp, direction, skb); |
| spin_unlock(&cp->lock); |
| |
| return ret; |
| } |
| |
| /* |
| * Hash table for SCTP application incarnations |
| */ |
| #define SCTP_APP_TAB_BITS 4 |
| #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) |
| #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) |
| |
| static struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; |
| static DEFINE_SPINLOCK(sctp_app_lock); |
| |
| static inline __u16 sctp_app_hashkey(__be16 port) |
| { |
| return (((__force u16)port >> SCTP_APP_TAB_BITS) ^ (__force u16)port) |
| & SCTP_APP_TAB_MASK; |
| } |
| |
| static int sctp_register_app(struct ip_vs_app *inc) |
| { |
| struct ip_vs_app *i; |
| __u16 hash; |
| __be16 port = inc->port; |
| int ret = 0; |
| |
| hash = sctp_app_hashkey(port); |
| |
| spin_lock_bh(&sctp_app_lock); |
| list_for_each_entry(i, &sctp_apps[hash], p_list) { |
| if (i->port == port) { |
| ret = -EEXIST; |
| goto out; |
| } |
| } |
| list_add(&inc->p_list, &sctp_apps[hash]); |
| atomic_inc(&ip_vs_protocol_sctp.appcnt); |
| out: |
| spin_unlock_bh(&sctp_app_lock); |
| |
| return ret; |
| } |
| |
| static void sctp_unregister_app(struct ip_vs_app *inc) |
| { |
| spin_lock_bh(&sctp_app_lock); |
| atomic_dec(&ip_vs_protocol_sctp.appcnt); |
| list_del(&inc->p_list); |
| spin_unlock_bh(&sctp_app_lock); |
| } |
| |
| static int sctp_app_conn_bind(struct ip_vs_conn *cp) |
| { |
| int hash; |
| struct ip_vs_app *inc; |
| int result = 0; |
| |
| /* Default binding: bind app only for NAT */ |
| if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ) |
| return 0; |
| /* Lookup application incarnations and bind the right one */ |
| hash = sctp_app_hashkey(cp->vport); |
| |
| spin_lock(&sctp_app_lock); |
| list_for_each_entry(inc, &sctp_apps[hash], p_list) { |
| if (inc->port == cp->vport) { |
| if (unlikely(!ip_vs_app_inc_get(inc))) |
| break; |
| spin_unlock(&sctp_app_lock); |
| |
| IP_VS_DBG_BUF(9, "%s: Binding conn %s:%u->" |
| "%s:%u to app %s on port %u\n", |
| __func__, |
| IP_VS_DBG_ADDR(cp->af, &cp->caddr), |
| ntohs(cp->cport), |
| IP_VS_DBG_ADDR(cp->af, &cp->vaddr), |
| ntohs(cp->vport), |
| inc->name, ntohs(inc->port)); |
| cp->app = inc; |
| if (inc->init_conn) |
| result = inc->init_conn(inc, cp); |
| goto out; |
| } |
| } |
| spin_unlock(&sctp_app_lock); |
| out: |
| return result; |
| } |
| |
| static void ip_vs_sctp_init(struct ip_vs_protocol *pp) |
| { |
| IP_VS_INIT_HASH_TABLE(sctp_apps); |
| pp->timeout_table = sctp_timeouts; |
| } |
| |
| |
| static void ip_vs_sctp_exit(struct ip_vs_protocol *pp) |
| { |
| |
| } |
| |
| struct ip_vs_protocol ip_vs_protocol_sctp = { |
| .name = "SCTP", |
| .protocol = IPPROTO_SCTP, |
| .num_states = IP_VS_SCTP_S_LAST, |
| .dont_defrag = 0, |
| .appcnt = ATOMIC_INIT(0), |
| .init = ip_vs_sctp_init, |
| .exit = ip_vs_sctp_exit, |
| .register_app = sctp_register_app, |
| .unregister_app = sctp_unregister_app, |
| .conn_schedule = sctp_conn_schedule, |
| .conn_in_get = ip_vs_conn_in_get_proto, |
| .conn_out_get = ip_vs_conn_out_get_proto, |
| .snat_handler = sctp_snat_handler, |
| .dnat_handler = sctp_dnat_handler, |
| .csum_check = sctp_csum_check, |
| .state_name = sctp_state_name, |
| .state_transition = sctp_state_transition, |
| .app_conn_bind = sctp_app_conn_bind, |
| .debug_packet = ip_vs_tcpudp_debug_packet, |
| .timeout_change = sctp_timeout_change, |
| .set_state_timeout = sctp_set_state_timeout, |
| }; |
