#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_proto_data *pd,
int *verdict, struct ip_vs_conn **cpp)
{
struct net *net;
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;
net = skb_net(skb);
if ((sch->type == SCTP_CID_INIT) &&
(svc = ip_vs_service_get(net, af, skb->mark, iph.protocol,
&iph.daddr, sh->dest))) {
int ignored;
if (ip_vs_todrop(net_ipvs(net))) {
/*
* 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, pd, &ignored);
if (!*cpp && ignored <= 0) {
if (!ignored)
*verdict = ip_vs_leave(svc, skb, pd);
else {
ip_vs_service_put(svc);
*verdict = NF_DROP;
}
return 0;
}
ip_vs_service_put(svc);
}
/* NF_ACCEPT */
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 received 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 received 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 received 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 received 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 const 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 inline int
set_sctp_state(struct ip_vs_proto_data *pd, 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",
pd->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;
}
}
}
if (likely(pd))
cp->timeout = pd->timeout_table[cp->state = next_state];
else /* What to do ? */
cp->timeout = sctp_timeouts[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_proto_data *pd)
{
int ret = 0;
spin_lock(&cp->lock);
ret = set_sctp_state(pd, cp, direction, skb);
spin_unlock(&cp->lock);
return ret;
}
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 net *net, struct ip_vs_app *inc)
{
struct ip_vs_app *i;
__u16 hash;
__be16 port = inc->port;
int ret = 0;
struct netns_ipvs *ipvs = net_ipvs(net);
struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_SCTP);
hash = sctp_app_hashkey(port);
spin_lock_bh(&ipvs->sctp_app_lock);
list_for_each_entry(i, &ipvs->sctp_apps[hash], p_list) {
if (i->port == port) {
ret = -EEXIST;
goto out;
}
}
list_add(&inc->p_list, &ipvs->sctp_apps[hash]);
atomic_inc(&pd->appcnt);
out:
spin_unlock_bh(&ipvs->sctp_app_lock);
return ret;
}
static void sctp_unregister_app(struct net *net, struct ip_vs_app *inc)
{
struct netns_ipvs *ipvs = net_ipvs(net);
struct ip_vs_proto_data *pd = ip_vs_proto_data_get(net, IPPROTO_SCTP);
spin_lock_bh(&ipvs->sctp_app_lock);
atomic_dec(&pd->appcnt);
list_del(&inc->p_list);
spin_unlock_bh(&ipvs->sctp_app_lock);
}
static int sctp_app_conn_bind(struct ip_vs_conn *cp)
{
struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(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(&ipvs->sctp_app_lock);
list_for_each_entry(inc, &ipvs->sctp_apps[hash], p_list) {
if (inc->port == cp->vport) {
if (unlikely(!ip_vs_app_inc_get(inc)))
break;
spin_unlock(&ipvs->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(&ipvs->sctp_app_lock);
out:
return result;
}
/* ---------------------------------------------
* timeouts is netns related now.
* ---------------------------------------------
*/
static void __ip_vs_sctp_init(struct net *net, struct ip_vs_proto_data *pd)
{
struct netns_ipvs *ipvs = net_ipvs(net);
ip_vs_init_hash_table(ipvs->sctp_apps, SCTP_APP_TAB_SIZE);
spin_lock_init(&ipvs->sctp_app_lock);
pd->timeout_table = ip_vs_create_timeout_table((int *)sctp_timeouts,
sizeof(sctp_timeouts));
}
static void __ip_vs_sctp_exit(struct net *net, struct ip_vs_proto_data *pd)
{
kfree(pd->timeout_table);
}
struct ip_vs_protocol ip_vs_protocol_sctp = {
.name = "SCTP",
.protocol = IPPROTO_SCTP,
.num_states = IP_VS_SCTP_S_LAST,
.dont_defrag = 0,
.init = NULL,
.exit = NULL,
.init_netns = __ip_vs_sctp_init,
.exit_netns = __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 = NULL,
};
