diff options
Diffstat (limited to 'net/netfilter/ipvs/ip_vs_proto_sctp.c')
| -rw-r--r-- | net/netfilter/ipvs/ip_vs_proto_sctp.c | 1183 |
1 files changed, 1183 insertions, 0 deletions
diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c new file mode 100644 index 000000000000..c9a3f7a21d53 --- /dev/null +++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c @@ -0,0 +1,1183 @@ +#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 struct ip_vs_conn * +sctp_conn_in_get(int af, + const struct sk_buff *skb, + struct ip_vs_protocol *pp, + const struct ip_vs_iphdr *iph, + unsigned int proto_off, + int inverse) +{ + __be16 _ports[2], *pptr; + + pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports); + if (pptr == NULL) + return NULL; + + if (likely(!inverse)) + return ip_vs_conn_in_get(af, iph->protocol, + &iph->saddr, pptr[0], + &iph->daddr, pptr[1]); + else + return ip_vs_conn_in_get(af, iph->protocol, + &iph->daddr, pptr[1], + &iph->saddr, pptr[0]); +} + +static struct ip_vs_conn * +sctp_conn_out_get(int af, + const struct sk_buff *skb, + struct ip_vs_protocol *pp, + const struct ip_vs_iphdr *iph, + unsigned int proto_off, + int inverse) +{ + __be16 _ports[2], *pptr; + + pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports); + if (pptr == NULL) + return NULL; + + if (likely(!inverse)) + return ip_vs_conn_out_get(af, iph->protocol, + &iph->saddr, pptr[0], + &iph->daddr, pptr[1]); + else + return ip_vs_conn_out_get(af, iph->protocol, + &iph->daddr, pptr[1], + &iph->saddr, pptr[0]); +} + +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))) { + 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); + if (!*cpp) { + *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; + __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); + for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) + crc32 = sctp_update_cksum((u8 *) skb->data, skb_headlen(skb), + 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; + __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->dest = cp->dport; + + /* Calculate the checksum */ + crc32 = sctp_start_cksum((u8 *) sctph, skb_headlen(skb) - sctphoff); + for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) + crc32 = sctp_update_cksum((u8 *) skb->data, skb_headlen(skb), + 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) +{ + struct sk_buff *list = skb_shinfo(skb)->frag_list; + unsigned int sctphoff; + struct sctphdr *sh, _sctph; + __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)); + for (; list; list = list->next) + tmp = sctp_update_cksum((__u8 *) list->data, + skb_headlen(list), tmp); + + val = sctp_end_cksum(tmp); + + if (val != cmp) { + /* CRC failure, dump it. */ + IP_VS_DBG_RL_PKT(0, 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 = sctp_conn_in_get, + .conn_out_get = sctp_conn_out_get, + .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, +}; |