/* 1st Level Abstractions. */
-/* Allocate and initialize a new association */
-struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep,
- const struct sock *sk,
- sctp_scope_t scope, int gfp)
-{
- struct sctp_association *asoc;
-
- asoc = t_new(struct sctp_association, gfp);
- if (!asoc)
- goto fail;
-
- if (!sctp_association_init(asoc, ep, sk, scope, gfp))
- goto fail_init;
-
- asoc->base.malloced = 1;
- SCTP_DBG_OBJCNT_INC(assoc);
-
- return asoc;
-
-fail_init:
- kfree(asoc);
-fail:
- return NULL;
-}
-
/* Initialize a new association from provided memory. */
-struct sctp_association *sctp_association_init(struct sctp_association *asoc,
+static struct sctp_association *sctp_association_init(struct sctp_association *asoc,
const struct sctp_endpoint *ep,
const struct sock *sk,
sctp_scope_t scope,
- int gfp)
+ gfp_t gfp)
{
- struct sctp_opt *sp;
+ struct sctp_sock *sp;
int i;
/* Retrieve the SCTP per socket area. */
/* Initialize the bind addr area. */
sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port);
- asoc->base.addr_lock = RW_LOCK_UNLOCKED;
+ rwlock_init(&asoc->base.addr_lock);
asoc->state = SCTP_STATE_CLOSED;
asoc->cookie_life.tv_sec = sp->assocparams.sasoc_cookie_life / 1000;
asoc->cookie_life.tv_usec = (sp->assocparams.sasoc_cookie_life % 1000)
* 1000;
- asoc->pmtu = 0;
asoc->frag_point = 0;
/* Set the association max_retrans and RTO values from the
asoc->overall_error_count = 0;
+ /* Initialize the association's heartbeat interval based on the
+ * sock configured value.
+ */
+ asoc->hbinterval = msecs_to_jiffies(sp->hbinterval);
+
+ /* Initialize path max retrans value. */
+ asoc->pathmaxrxt = sp->pathmaxrxt;
+
+ /* Initialize default path MTU. */
+ asoc->pathmtu = sp->pathmtu;
+
+ /* Set association default SACK delay */
+ asoc->sackdelay = msecs_to_jiffies(sp->sackdelay);
+
+ /* Set the association default flags controlling
+ * Heartbeat, SACK delay, and Path MTU Discovery.
+ */
+ asoc->param_flags = sp->param_flags;
+
/* Initialize the maximum mumber of new data packets that can be sent
* in a burst.
*/
asoc->max_burst = sctp_max_burst;
- /* Copy things from the endpoint. */
+ /* initialize association timers */
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0;
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = asoc->rto_initial;
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = asoc->rto_initial;
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = asoc->rto_initial;
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] = 0;
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = 0;
+
+ /* sctpimpguide Section 2.12.2
+ * If the 'T5-shutdown-guard' timer is used, it SHOULD be set to the
+ * recommended value of 5 times 'RTO.Max'.
+ */
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD]
+ = 5 * asoc->rto_max;
+
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_HEARTBEAT] = 0;
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = asoc->sackdelay;
+ asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] =
+ sp->autoclose * HZ;
+
+ /* Initilizes the timers */
for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) {
- asoc->timeouts[i] = ep->timeouts[i];
init_timer(&asoc->timers[i]);
asoc->timers[i].function = sctp_timer_events[i];
asoc->timers[i].data = (unsigned long) asoc;
* RFC 6 - A SCTP receiver MUST be able to receive a minimum of
* 1500 bytes in one SCTP packet.
*/
- if (sk->sk_rcvbuf < SCTP_DEFAULT_MINWINDOW)
+ if ((sk->sk_rcvbuf/2) < SCTP_DEFAULT_MINWINDOW)
asoc->rwnd = SCTP_DEFAULT_MINWINDOW;
else
- asoc->rwnd = sk->sk_rcvbuf;
+ asoc->rwnd = sk->sk_rcvbuf/2;
asoc->a_rwnd = asoc->rwnd;
/* Set the sndbuf size for transmit. */
asoc->sndbuf_used = 0;
+ /* Initialize the receive memory counter */
+ atomic_set(&asoc->rmem_alloc, 0);
+
init_waitqueue_head(&asoc->wait);
asoc->c.my_vtag = sctp_generate_tag(ep);
asoc->c.peer_vtag = 0;
asoc->c.my_ttag = 0;
asoc->c.peer_ttag = 0;
+ asoc->c.my_port = ep->base.bind_addr.port;
asoc->c.initial_tsn = sctp_generate_tsn(ep);
asoc->last_cwr_tsn = asoc->ctsn_ack_point;
asoc->unack_data = 0;
- SCTP_DEBUG_PRINTK("myctsnap for %s INIT as 0x%x.\n",
- asoc->ep->debug_name,
- asoc->ctsn_ack_point);
-
/* ADDIP Section 4.1 Asconf Chunk Procedures
*
* When an endpoint has an ASCONF signaled change to be sent to the
*/
asoc->addip_serial = asoc->c.initial_tsn;
- skb_queue_head_init(&asoc->addip_chunks);
+ INIT_LIST_HEAD(&asoc->addip_chunk_list);
/* Make an empty list of remote transport addresses. */
INIT_LIST_HEAD(&asoc->peer.transport_addr_list);
+ asoc->peer.transport_count = 0;
/* RFC 2960 5.1 Normal Establishment of an Association
*
asoc->need_ecne = 0;
- asoc->assoc_id = (sctp_assoc_t)-1L;
+ asoc->assoc_id = 0;
/* Assume that peer would support both address types unless we are
* told otherwise.
return NULL;
}
+/* Allocate and initialize a new association */
+struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep,
+ const struct sock *sk,
+ sctp_scope_t scope,
+ gfp_t gfp)
+{
+ struct sctp_association *asoc;
+
+ asoc = t_new(struct sctp_association, gfp);
+ if (!asoc)
+ goto fail;
+
+ if (!sctp_association_init(asoc, ep, sk, scope, gfp))
+ goto fail_init;
+
+ asoc->base.malloced = 1;
+ SCTP_DBG_OBJCNT_INC(assoc);
+ SCTP_DEBUG_PRINTK("Created asoc %p\n", asoc);
+
+ return asoc;
+
+fail_init:
+ kfree(asoc);
+fail:
+ return NULL;
+}
+
/* Free this association if possible. There may still be users, so
* the actual deallocation may be delayed.
*/
}
/* Free peer's cached cookie. */
- if (asoc->peer.cookie) {
- kfree(asoc->peer.cookie);
- }
+ kfree(asoc->peer.cookie);
/* Release the transport structures. */
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
sctp_transport_free(transport);
}
+ asoc->peer.transport_count = 0;
+
/* Free any cached ASCONF_ACK chunk. */
if (asoc->addip_last_asconf_ack)
sctp_chunk_free(asoc->addip_last_asconf_ack);
sctp_endpoint_put(asoc->ep);
sock_put(asoc->base.sk);
- if ((long)asoc->assoc_id != -1L) {
+ if (asoc->assoc_id != 0) {
spin_lock_bh(&sctp_assocs_id_lock);
- idr_remove(&sctp_assocs_id, (long)asoc->assoc_id);
+ idr_remove(&sctp_assocs_id, asoc->assoc_id);
spin_unlock_bh(&sctp_assocs_id_lock);
}
+ BUG_TRAP(!atomic_read(&asoc->rmem_alloc));
+
if (asoc->base.malloced) {
kfree(asoc);
SCTP_DBG_OBJCNT_DEC(assoc);
/* If the primary path is changing, assume that the
* user wants to use this new path.
*/
- if (transport->active)
+ if (transport->state != SCTP_INACTIVE)
asoc->peer.active_path = transport;
/*
transport->cacc.next_tsn_at_change = asoc->next_tsn;
}
+/* Remove a transport from an association. */
+void sctp_assoc_rm_peer(struct sctp_association *asoc,
+ struct sctp_transport *peer)
+{
+ struct list_head *pos;
+ struct sctp_transport *transport;
+
+ SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_rm_peer:association %p addr: ",
+ " port: %d\n",
+ asoc,
+ (&peer->ipaddr),
+ peer->ipaddr.v4.sin_port);
+
+ /* If we are to remove the current retran_path, update it
+ * to the next peer before removing this peer from the list.
+ */
+ if (asoc->peer.retran_path == peer)
+ sctp_assoc_update_retran_path(asoc);
+
+ /* Remove this peer from the list. */
+ list_del(&peer->transports);
+
+ /* Get the first transport of asoc. */
+ pos = asoc->peer.transport_addr_list.next;
+ transport = list_entry(pos, struct sctp_transport, transports);
+
+ /* Update any entries that match the peer to be deleted. */
+ if (asoc->peer.primary_path == peer)
+ sctp_assoc_set_primary(asoc, transport);
+ if (asoc->peer.active_path == peer)
+ asoc->peer.active_path = transport;
+ if (asoc->peer.last_data_from == peer)
+ asoc->peer.last_data_from = transport;
+
+ /* If we remove the transport an INIT was last sent to, set it to
+ * NULL. Combined with the update of the retran path above, this
+ * will cause the next INIT to be sent to the next available
+ * transport, maintaining the cycle.
+ */
+ if (asoc->init_last_sent_to == peer)
+ asoc->init_last_sent_to = NULL;
+
+ asoc->peer.transport_count--;
+
+ sctp_transport_free(peer);
+}
+
/* Add a transport address to an association. */
struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
const union sctp_addr *addr,
- int gfp)
+ const gfp_t gfp,
+ const int peer_state)
{
struct sctp_transport *peer;
- struct sctp_opt *sp;
+ struct sctp_sock *sp;
unsigned short port;
sp = sctp_sk(asoc->base.sk);
/* AF_INET and AF_INET6 share common port field. */
port = addr->v4.sin_port;
+ SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ",
+ " port: %d state:%s\n",
+ asoc,
+ addr,
+ addr->v4.sin_port,
+ peer_state == SCTP_UNKNOWN?"UNKNOWN":"ACTIVE");
+
/* Set the port if it has not been set yet. */
if (0 == asoc->peer.port)
asoc->peer.port = port;
/* Check to see if this is a duplicate. */
peer = sctp_assoc_lookup_paddr(asoc, addr);
- if (peer)
+ if (peer) {
+ if (peer_state == SCTP_ACTIVE &&
+ peer->state == SCTP_UNKNOWN)
+ peer->state = SCTP_ACTIVE;
return peer;
+ }
peer = sctp_transport_new(addr, gfp);
if (!peer)
sctp_transport_set_owner(peer, asoc);
+ /* Initialize the peer's heartbeat interval based on the
+ * association configured value.
+ */
+ peer->hbinterval = asoc->hbinterval;
+
+ /* Set the path max_retrans. */
+ peer->pathmaxrxt = asoc->pathmaxrxt;
+
+ /* Initialize the peer's SACK delay timeout based on the
+ * association configured value.
+ */
+ peer->sackdelay = asoc->sackdelay;
+
+ /* Enable/disable heartbeat, SACK delay, and path MTU discovery
+ * based on association setting.
+ */
+ peer->param_flags = asoc->param_flags;
+
/* Initialize the pmtu of the transport. */
- sctp_transport_pmtu(peer);
+ if (peer->param_flags & SPP_PMTUD_ENABLE)
+ sctp_transport_pmtu(peer);
+ else if (asoc->pathmtu)
+ peer->pathmtu = asoc->pathmtu;
+ else
+ peer->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
/* If this is the first transport addr on this association,
* initialize the association PMTU to the peer's PMTU.
* If not and the current association PMTU is higher than the new
* peer's PMTU, reset the association PMTU to the new peer's PMTU.
*/
- if (asoc->pmtu)
- asoc->pmtu = min_t(int, peer->pmtu, asoc->pmtu);
+ if (asoc->pathmtu)
+ asoc->pathmtu = min_t(int, peer->pathmtu, asoc->pathmtu);
else
- asoc->pmtu = peer->pmtu;
+ asoc->pathmtu = peer->pathmtu;
SCTP_DEBUG_PRINTK("sctp_assoc_add_peer:association %p PMTU set to "
- "%d\n", asoc, asoc->pmtu);
+ "%d\n", asoc, asoc->pathmtu);
- asoc->frag_point = sctp_frag_point(sp, asoc->pmtu);
+ asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu);
/* The asoc->peer.port might not be meaningful yet, but
* initialize the packet structure anyway.
/* 7.2.1 Slow-Start
*
- * o The initial cwnd before data transmission or after a
- * sufficiently long idle period MUST be <= 2*MTU.
+ * o The initial cwnd before DATA transmission or after a sufficiently
+ * long idle period MUST be set to
+ * min(4*MTU, max(2*MTU, 4380 bytes))
*
* o The initial value of ssthresh MAY be arbitrarily high
* (for example, implementations MAY use the size of the
* receiver advertised window).
*/
- peer->cwnd = asoc->pmtu * 2;
+ peer->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380));
/* At this point, we may not have the receiver's advertised window,
* so initialize ssthresh to the default value and it will be set
peer->partial_bytes_acked = 0;
peer->flight_size = 0;
- peer->error_threshold = peer->max_retrans;
-
- /* By default, enable heartbeat for peer address. */
- peer->hb_allowed = 1;
-
- /* Initialize the peer's heartbeat interval based on the
- * sock configured value.
- */
- peer->hb_interval = msecs_to_jiffies(sp->paddrparam.spp_hbinterval);
-
- /* Set the path max_retrans. */
- peer->max_retrans = asoc->max_retrans;
/* Set the transport's RTO.initial value */
peer->rto = asoc->rto_initial;
+ /* Set the peer's active state. */
+ peer->state = peer_state;
+
/* Attach the remote transport to our asoc. */
list_add_tail(&peer->transports, &asoc->peer.transport_addr_list);
+ asoc->peer.transport_count++;
/* If we do not yet have a primary path, set one. */
if (!asoc->peer.primary_path) {
asoc->peer.retran_path = peer;
}
- if (asoc->peer.active_path == asoc->peer.retran_path)
+ if (asoc->peer.active_path == asoc->peer.retran_path) {
asoc->peer.retran_path = peer;
+ }
return peer;
}
{
struct list_head *pos;
struct list_head *temp;
- struct sctp_transport *peer = NULL;
struct sctp_transport *transport;
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
transport = list_entry(pos, struct sctp_transport, transports);
if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) {
- peer = transport;
- list_del(pos);
+ /* Do book keeping for removing the peer and free it. */
+ sctp_assoc_rm_peer(asoc, transport);
break;
}
}
-
- /* The address we want delete is not in the association. */
- if (!peer)
- return;
-
- /* Get the first transport of asoc. */
- pos = asoc->peer.transport_addr_list.next;
- transport = list_entry(pos, struct sctp_transport, transports);
-
- /* Update any entries that match the peer to be deleted. */
- if (asoc->peer.primary_path == peer)
- sctp_assoc_set_primary(asoc, transport);
- if (asoc->peer.active_path == peer)
- asoc->peer.active_path = transport;
- if (asoc->peer.retran_path == peer)
- asoc->peer.retran_path = transport;
- if (asoc->peer.last_data_from == peer)
- asoc->peer.last_data_from = transport;
-
- sctp_transport_free(peer);
}
/* Lookup a transport by address. */
/* Record the transition on the transport. */
switch (command) {
case SCTP_TRANSPORT_UP:
- transport->active = SCTP_ACTIVE;
+ transport->state = SCTP_ACTIVE;
spc_state = SCTP_ADDR_AVAILABLE;
break;
case SCTP_TRANSPORT_DOWN:
- transport->active = SCTP_INACTIVE;
+ transport->state = SCTP_INACTIVE;
spc_state = SCTP_ADDR_UNREACHABLE;
break;
list_for_each(pos, &asoc->peer.transport_addr_list) {
t = list_entry(pos, struct sctp_transport, transports);
- if (!t->active)
+ if (t->state == SCTP_INACTIVE)
continue;
if (!first || t->last_time_heard > first->last_time_heard) {
second = first;
* [If the primary is active but not most recent, bump the most
* recently used transport.]
*/
- if (asoc->peer.primary_path->active &&
+ if (asoc->peer.primary_path->state != SCTP_INACTIVE &&
first != asoc->peer.primary_path) {
second = first;
first = asoc->peer.primary_path;
return retval;
}
-/* Allocate 'num' TSNs by incrementing the association's TSN by num. */
-__u32 sctp_association_get_tsn_block(struct sctp_association *asoc, int num)
-{
- __u32 retval = asoc->next_tsn;
-
- asoc->next_tsn += num;
- asoc->unack_data += num;
-
- return retval;
-}
-
-
/* Compare two addresses to see if they match. Wildcard addresses
* only match themselves.
*/
return chunk;
}
-/* Use this function for the packet prepend callback when no ECNE
- * packet is desired (e.g. some packets don't like to be bundled).
- */
-struct sctp_chunk *sctp_get_no_prepend(struct sctp_association *asoc)
-{
- return NULL;
-}
-
/*
* Find which transport this TSN was sent on.
*/
struct sctp_chunk *chunk;
struct sock *sk;
struct sctp_inq *inqueue;
- int state, subtype;
+ int state;
+ sctp_subtype_t subtype;
int error = 0;
/* The association should be held so we should be safe. */
sctp_association_hold(asoc);
while (NULL != (chunk = sctp_inq_pop(inqueue))) {
state = asoc->state;
- subtype = chunk->chunk_hdr->type;
+ subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
/* Remember where the last DATA chunk came from so we
* know where to send the SACK.
if (sctp_chunk_is_data(chunk))
asoc->peer.last_data_from = chunk->transport;
else
- SCTP_INC_STATS(SctpInCtrlChunks);
+ SCTP_INC_STATS(SCTP_MIB_INCTRLCHUNKS);
if (chunk->transport)
chunk->transport->last_time_heard = jiffies;
/* Run through the state machine. */
- error = sctp_do_sm(SCTP_EVENT_T_CHUNK, SCTP_ST_CHUNK(subtype),
+ error = sctp_do_sm(SCTP_EVENT_T_CHUNK, subtype,
state, ep, asoc, chunk, GFP_ATOMIC);
/* Check to see if the association is freed in response to
/* This routine moves an association from its old sk to a new sk. */
void sctp_assoc_migrate(struct sctp_association *assoc, struct sock *newsk)
{
- struct sctp_opt *newsp = sctp_sk(newsk);
+ struct sctp_sock *newsp = sctp_sk(newsk);
struct sock *oldsk = assoc->base.sk;
/* Delete the association from the old endpoint's list of
transports);
if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr))
sctp_assoc_add_peer(asoc, &trans->ipaddr,
- GFP_ATOMIC);
+ GFP_ATOMIC, SCTP_ACTIVE);
}
asoc->ctsn_ack_point = asoc->next_tsn - 1;
/* Try to find an active transport. */
- if (t->active) {
+ if (t->state != SCTP_INACTIVE) {
break;
} else {
/* Keep track of the next transport in case
}
asoc->peer.retran_path = t;
+
+ SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association"
+ " %p addr: ",
+ " port: %d\n",
+ asoc,
+ (&t->ipaddr),
+ t->ipaddr.v4.sin_port);
+}
+
+/* Choose the transport for sending a INIT packet. */
+struct sctp_transport *sctp_assoc_choose_init_transport(
+ struct sctp_association *asoc)
+{
+ struct sctp_transport *t;
+
+ /* Use the retran path. If the last INIT was sent over the
+ * retran path, update the retran path and use it.
+ */
+ if (!asoc->init_last_sent_to) {
+ t = asoc->peer.active_path;
+ } else {
+ if (asoc->init_last_sent_to == asoc->peer.retran_path)
+ sctp_assoc_update_retran_path(asoc);
+ t = asoc->peer.retran_path;
+ }
+
+ SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association"
+ " %p addr: ",
+ " port: %d\n",
+ asoc,
+ (&t->ipaddr),
+ t->ipaddr.v4.sin_port);
+
+ return t;
}
/* Choose the transport for sending a SHUTDOWN packet. */
/* Get the lowest pmtu of all the transports. */
list_for_each(pos, &asoc->peer.transport_addr_list) {
t = list_entry(pos, struct sctp_transport, transports);
- if (!pmtu || (t->pmtu < pmtu))
- pmtu = t->pmtu;
+ if (!pmtu || (t->pathmtu < pmtu))
+ pmtu = t->pathmtu;
}
if (pmtu) {
- struct sctp_opt *sp = sctp_sk(asoc->base.sk);
- asoc->pmtu = pmtu;
+ struct sctp_sock *sp = sctp_sk(asoc->base.sk);
+ asoc->pathmtu = pmtu;
asoc->frag_point = sctp_frag_point(sp, pmtu);
}
SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n",
- __FUNCTION__, asoc, asoc->pmtu, asoc->frag_point);
+ __FUNCTION__, asoc, asoc->pathmtu, asoc->frag_point);
}
/* Should we send a SACK to update our peer? */
case SCTP_STATE_ESTABLISHED:
case SCTP_STATE_SHUTDOWN_PENDING:
case SCTP_STATE_SHUTDOWN_RECEIVED:
+ case SCTP_STATE_SHUTDOWN_SENT:
if ((asoc->rwnd > asoc->a_rwnd) &&
((asoc->rwnd - asoc->a_rwnd) >=
- min_t(__u32, (asoc->base.sk->sk_rcvbuf >> 1), asoc->pmtu)))
+ min_t(__u32, (asoc->base.sk->sk_rcvbuf >> 1), asoc->pathmtu)))
return 1;
break;
default:
/* Build the bind address list for the association based on info from the
* local endpoint and the remote peer.
*/
-int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, int gfp)
+int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc,
+ gfp_t gfp)
{
sctp_scope_t scope;
int flags;
/* Build the association's bind address list from the cookie. */
int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *asoc,
- struct sctp_cookie *cookie, int gfp)
+ struct sctp_cookie *cookie,
+ gfp_t gfp)
{
int var_size2 = ntohs(cookie->peer_init->chunk_hdr.length);
int var_size3 = cookie->raw_addr_list_len;
git://git.onelab.eu / linux-2.6.git / blobdiff