-/* SCTP kernel reference Implementation
+/* SCTP kernel implementation
* (C) Copyright IBM Corp. 2001, 2004
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001 Intel Corp.
* Copyright (c) 2001 La Monte H.P. Yarroll
*
- * This file is part of the SCTP kernel reference Implementation
+ * This file is part of the SCTP kernel implementation
*
* This module provides the abstraction for an SCTP association.
*
- * The SCTP reference implementation is free software;
+ * This SCTP implementation is free software;
* you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
- * The SCTP reference implementation is distributed in the hope that it
+ * This SCTP implementation is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* ************************
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#include <linux/fcntl.h>
#include <linux/poll.h>
#include <linux/init.h>
-#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <net/sctp/sm.h>
/* Forward declarations for internal functions. */
-static void sctp_assoc_bh_rcv(struct sctp_association *asoc);
+static void sctp_assoc_bh_rcv(struct work_struct *work);
+static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc);
/* 1st Level Abstractions. */
{
struct sctp_sock *sp;
int i;
+ sctp_paramhdr_t *p;
+ int err;
/* Retrieve the SCTP per socket area. */
sp = sctp_sk((struct sock *)sk);
/* Initialize the bind addr area. */
sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port);
- rwlock_init(&asoc->base.addr_lock);
asoc->state = SCTP_STATE_CLOSED;
/* Initialize the maximum mumber of new data packets that can be sent
* in a burst.
*/
- asoc->max_burst = sctp_max_burst;
+ asoc->max_burst = sp->max_burst;
/* initialize association timers */
asoc->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0;
* 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]
+ 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) {
- init_timer(&asoc->timers[i]);
- asoc->timers[i].function = sctp_timer_events[i];
- asoc->timers[i].data = (unsigned long) asoc;
- }
+ for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i)
+ setup_timer(&asoc->timers[i], sctp_timer_events[i],
+ (unsigned long)asoc);
/* Pull default initialization values from the sock options.
* Note: This assumes that the values have already been
asoc->addip_serial = asoc->c.initial_tsn;
INIT_LIST_HEAD(&asoc->addip_chunk_list);
+ INIT_LIST_HEAD(&asoc->asconf_ack_list);
/* Make an empty list of remote transport addresses. */
INIT_LIST_HEAD(&asoc->peer.transport_addr_list);
*/
asoc->peer.sack_needed = 1;
- /* Assume that the peer recongizes ASCONF until reported otherwise
- * via an ERROR chunk.
+ /* Assume that the peer will tell us if he recognizes ASCONF
+ * as part of INIT exchange.
+ * The sctp_addip_noauth option is there for backward compatibilty
+ * and will revert old behavior.
*/
- asoc->peer.asconf_capable = 1;
+ asoc->peer.asconf_capable = 0;
+ if (sctp_addip_noauth)
+ asoc->peer.asconf_capable = 1;
/* Create an input queue. */
sctp_inq_init(&asoc->base.inqueue);
- sctp_inq_set_th_handler(&asoc->base.inqueue,
- (void (*)(void *))sctp_assoc_bh_rcv,
- asoc);
+ sctp_inq_set_th_handler(&asoc->base.inqueue, sctp_assoc_bh_rcv);
/* Create an output queue. */
sctp_outq_init(asoc, &asoc->outqueue);
asoc->default_flags = sp->default_flags;
asoc->default_context = sp->default_context;
asoc->default_timetolive = sp->default_timetolive;
+ asoc->default_rcv_context = sp->default_rcv_context;
+
+ /* AUTH related initializations */
+ INIT_LIST_HEAD(&asoc->endpoint_shared_keys);
+ err = sctp_auth_asoc_copy_shkeys(ep, asoc, gfp);
+ if (err)
+ goto fail_init;
+
+ asoc->active_key_id = ep->active_key_id;
+ asoc->asoc_shared_key = NULL;
+
+ asoc->default_hmac_id = 0;
+ /* Save the hmacs and chunks list into this association */
+ if (ep->auth_hmacs_list)
+ memcpy(asoc->c.auth_hmacs, ep->auth_hmacs_list,
+ ntohs(ep->auth_hmacs_list->param_hdr.length));
+ if (ep->auth_chunk_list)
+ memcpy(asoc->c.auth_chunks, ep->auth_chunk_list,
+ ntohs(ep->auth_chunk_list->param_hdr.length));
+
+ /* Get the AUTH random number for this association */
+ p = (sctp_paramhdr_t *)asoc->c.auth_random;
+ p->type = SCTP_PARAM_RANDOM;
+ p->length = htons(sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH);
+ get_random_bytes(p+1, SCTP_AUTH_RANDOM_LENGTH);
return asoc;
/* Free peer's cached cookie. */
kfree(asoc->peer.cookie);
+ kfree(asoc->peer.peer_random);
+ kfree(asoc->peer.peer_chunks);
+ kfree(asoc->peer.peer_hmacs);
/* Release the transport structures. */
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
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_assoc_free_asconf_acks(asoc);
/* Free any cached ASCONF chunk. */
if (asoc->addip_last_asconf)
sctp_chunk_free(asoc->addip_last_asconf);
+ /* AUTH - Free the endpoint shared keys */
+ sctp_auth_destroy_keys(&asoc->endpoint_shared_keys);
+
+ /* AUTH - Free the association shared key */
+ sctp_auth_key_put(asoc->asoc_shared_key);
+
sctp_association_put(asoc);
}
SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_rm_peer:association %p addr: ",
" port: %d\n",
asoc,
- (&peer->ipaddr_h),
- peer->ipaddr_h.v4.sin_port);
+ (&peer->ipaddr),
+ ntohs(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.
sp = sctp_sk(asoc->base.sk);
/* AF_INET and AF_INET6 share common port field. */
- port = addr->v4.sin_port;
+ port = ntohs(addr->v4.sin_port);
SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ",
" port: %d state:%d\n",
asoc,
addr,
- addr->v4.sin_port,
+ port,
peer_state);
/* Set the port if it has not been set yet. */
struct list_head *pos;
struct list_head *temp;
struct sctp_transport *transport;
- union sctp_addr tmp;
-
- flip_to_n(&tmp, addr);
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
transport = list_entry(pos, struct sctp_transport, transports);
- if (sctp_cmp_addr_exact(&tmp, &transport->ipaddr)) {
+ if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) {
/* Do book keeping for removing the peer and free it. */
sctp_assoc_rm_peer(asoc, transport);
break;
const union sctp_addr *address)
{
struct sctp_transport *t;
- struct list_head *pos;
- union sctp_addr tmp;
- flip_to_n(&tmp, address);
/* Cycle through all transports searching for a peer address. */
- list_for_each(pos, &asoc->peer.transport_addr_list) {
- t = list_entry(pos, struct sctp_transport, transports);
- if (sctp_cmp_addr_exact(&tmp, &t->ipaddr))
+ list_for_each_entry(t, &asoc->peer.transport_addr_list,
+ transports) {
+ if (sctp_cmp_addr_exact(address, &t->ipaddr))
return t;
}
return NULL;
}
+/* Remove all transports except a give one */
+void sctp_assoc_del_nonprimary_peers(struct sctp_association *asoc,
+ struct sctp_transport *primary)
+{
+ struct sctp_transport *temp;
+ struct sctp_transport *t;
+
+ list_for_each_entry_safe(t, temp, &asoc->peer.transport_addr_list,
+ transports) {
+ /* if the current transport is not the primary one, delete it */
+ if (t != primary)
+ sctp_assoc_rm_peer(asoc, t);
+ }
+
+ return;
+}
+
/* Engage in transport control operations.
* Mark the transport up or down and send a notification to the user.
* Select and update the new active and retran paths.
struct sctp_transport *second;
struct sctp_ulpevent *event;
struct sockaddr_storage addr;
- struct list_head *pos;
int spc_state = 0;
/* Record the transition on the transport. */
switch (command) {
case SCTP_TRANSPORT_UP:
+ /* If we are moving from UNCONFIRMED state due
+ * to heartbeat success, report the SCTP_ADDR_CONFIRMED
+ * state to the user, otherwise report SCTP_ADDR_AVAILABLE.
+ */
+ if (SCTP_UNCONFIRMED == transport->state &&
+ SCTP_HEARTBEAT_SUCCESS == error)
+ spc_state = SCTP_ADDR_CONFIRMED;
+ else
+ spc_state = SCTP_ADDR_AVAILABLE;
transport->state = SCTP_ACTIVE;
- spc_state = SCTP_ADDR_AVAILABLE;
break;
case SCTP_TRANSPORT_DOWN:
- transport->state = SCTP_INACTIVE;
+ /* if the transort was never confirmed, do not transition it
+ * to inactive state.
+ */
+ if (transport->state != SCTP_UNCONFIRMED)
+ transport->state = SCTP_INACTIVE;
+
spc_state = SCTP_ADDR_UNREACHABLE;
break;
default:
return;
- };
+ }
/* Generate and send a SCTP_PEER_ADDR_CHANGE notification to the
* user.
*/
memset(&addr, 0, sizeof(struct sockaddr_storage));
- flip_to_n((union sctp_addr *)&addr, &transport->ipaddr_h);
+ memcpy(&addr, &transport->ipaddr, transport->af_specific->sockaddr_len);
event = sctp_ulpevent_make_peer_addr_change(asoc, &addr,
0, spc_state, error, GFP_ATOMIC);
if (event)
*/
first = NULL; second = NULL;
- list_for_each(pos, &asoc->peer.transport_addr_list) {
- t = list_entry(pos, struct sctp_transport, transports);
+ list_for_each_entry(t, &asoc->peer.transport_addr_list,
+ transports) {
if ((t->state == SCTP_INACTIVE) ||
(t->state == SCTP_UNCONFIRMED))
{
struct sctp_transport *active;
struct sctp_transport *match;
- struct list_head *entry, *pos;
struct sctp_transport *transport;
struct sctp_chunk *chunk;
__be32 key = htonl(tsn);
active = asoc->peer.active_path;
- list_for_each(entry, &active->transmitted) {
- chunk = list_entry(entry, struct sctp_chunk, transmitted_list);
+ list_for_each_entry(chunk, &active->transmitted,
+ transmitted_list) {
if (key == chunk->subh.data_hdr->tsn) {
match = active;
}
/* If not found, go search all the other transports. */
- list_for_each(pos, &asoc->peer.transport_addr_list) {
- transport = list_entry(pos, struct sctp_transport, transports);
+ list_for_each_entry(transport, &asoc->peer.transport_addr_list,
+ transports) {
if (transport == active)
break;
- list_for_each(entry, &transport->transmitted) {
- chunk = list_entry(entry, struct sctp_chunk,
- transmitted_list);
+ list_for_each_entry(chunk, &transport->transmitted,
+ transmitted_list) {
if (key == chunk->subh.data_hdr->tsn) {
match = transport;
goto out;
const union sctp_addr *paddr)
{
struct sctp_transport *transport;
- union sctp_addr tmp;
- flip_to_n(&tmp, laddr);
-
- sctp_read_lock(&asoc->base.addr_lock);
- if ((asoc->base.bind_addr.port == laddr->v4.sin_port) &&
- (asoc->peer.port == paddr->v4.sin_port)) {
+ if ((htons(asoc->base.bind_addr.port) == laddr->v4.sin_port) &&
+ (htons(asoc->peer.port) == paddr->v4.sin_port)) {
transport = sctp_assoc_lookup_paddr(asoc, paddr);
if (!transport)
goto out;
- if (sctp_bind_addr_match(&asoc->base.bind_addr, &tmp,
+ if (sctp_bind_addr_match(&asoc->base.bind_addr, laddr,
sctp_sk(asoc->base.sk)))
goto out;
}
transport = NULL;
out:
- sctp_read_unlock(&asoc->base.addr_lock);
return transport;
}
/* Do delayed input processing. This is scheduled by sctp_rcv(). */
-static void sctp_assoc_bh_rcv(struct sctp_association *asoc)
+static void sctp_assoc_bh_rcv(struct work_struct *work)
{
+ struct sctp_association *asoc =
+ container_of(work, struct sctp_association,
+ base.inqueue.immediate);
struct sctp_endpoint *ep;
struct sctp_chunk *chunk;
struct sock *sk;
state = asoc->state;
subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
+ /* SCTP-AUTH, Section 6.3:
+ * The receiver has a list of chunk types which it expects
+ * to be received only after an AUTH-chunk. This list has
+ * been sent to the peer during the association setup. It
+ * MUST silently discard these chunks if they are not placed
+ * after an AUTH chunk in the packet.
+ */
+ if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
+ continue;
+
/* Remember where the last DATA chunk came from so we
* know where to send the SACK.
*/
/* Remove any peer addresses not present in the new association. */
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
trans = list_entry(pos, struct sctp_transport, transports);
- if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr_h))
- sctp_assoc_del_peer(asoc, &trans->ipaddr_h);
+ if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr))
+ sctp_assoc_del_peer(asoc, &trans->ipaddr);
+
+ if (asoc->state >= SCTP_STATE_ESTABLISHED)
+ sctp_transport_reset(trans);
}
/* If the case is A (association restart), use
*/
sctp_ssnmap_clear(asoc->ssnmap);
+ /* Flush the ULP reassembly and ordered queue.
+ * Any data there will now be stale and will
+ * cause problems.
+ */
+ sctp_ulpq_flush(&asoc->ulpq);
+
+ /* reset the overall association error count so
+ * that the restarted association doesn't get torn
+ * down on the next retransmission timer.
+ */
+ asoc->overall_error_count = 0;
+
} else {
/* Add any peer addresses from the new association. */
- list_for_each(pos, &new->peer.transport_addr_list) {
- trans = list_entry(pos, struct sctp_transport,
- transports);
- if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr_h))
- sctp_assoc_add_peer(asoc, &trans->ipaddr_h,
+ list_for_each_entry(trans, &new->peer.transport_addr_list,
+ transports) {
+ if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr))
+ sctp_assoc_add_peer(asoc, &trans->ipaddr,
GFP_ATOMIC, trans->state);
}
asoc->ssnmap = new->ssnmap;
new->ssnmap = NULL;
}
+
+ if (!asoc->assoc_id) {
+ /* get a new association id since we don't have one
+ * yet.
+ */
+ sctp_assoc_set_id(asoc, GFP_ATOMIC);
+ }
}
+
+ /* SCTP-AUTH: Save the peer parameters from the new assocaitions
+ * and also move the association shared keys over
+ */
+ kfree(asoc->peer.peer_random);
+ asoc->peer.peer_random = new->peer.peer_random;
+ new->peer.peer_random = NULL;
+
+ kfree(asoc->peer.peer_chunks);
+ asoc->peer.peer_chunks = new->peer.peer_chunks;
+ new->peer.peer_chunks = NULL;
+
+ kfree(asoc->peer.peer_hmacs);
+ asoc->peer.peer_hmacs = new->peer.peer_hmacs;
+ new->peer.peer_hmacs = NULL;
+
+ sctp_auth_key_put(asoc->asoc_shared_key);
+ sctp_auth_asoc_init_active_key(asoc, GFP_ATOMIC);
}
/* Update the retran path for sending a retransmitted packet.
" %p addr: ",
" port: %d\n",
asoc,
- (&t->ipaddr_h),
- t->ipaddr_h.v4.sin_port);
+ (&t->ipaddr),
+ ntohs(t->ipaddr.v4.sin_port));
}
/* Choose the transport for sending a INIT packet. */
" %p addr: ",
" port: %d\n",
asoc,
- (&t->ipaddr_h),
- t->ipaddr_h.v4.sin_port);
+ (&t->ipaddr),
+ ntohs(t->ipaddr.v4.sin_port));
return t;
}
void sctp_assoc_sync_pmtu(struct sctp_association *asoc)
{
struct sctp_transport *t;
- struct list_head *pos;
__u32 pmtu = 0;
if (!asoc)
return;
/* 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);
+ list_for_each_entry(t, &asoc->peer.transport_addr_list,
+ transports) {
+ if (t->pmtu_pending && t->dst) {
+ sctp_transport_update_pmtu(t, dst_mtu(t->dst));
+ t->pmtu_pending = 0;
+ }
if (!pmtu || (t->pathmtu < pmtu))
pmtu = t->pathmtu;
}
}
SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n",
- __FUNCTION__, asoc, asoc->pathmtu, asoc->frag_point);
+ __func__, asoc, asoc->pathmtu, asoc->frag_point);
}
/* Should we send a SACK to update our peer? */
}
SCTP_DEBUG_PRINTK("%s: asoc %p rwnd increased by %d to (%u, %u) "
- "- %u\n", __FUNCTION__, asoc, len, asoc->rwnd,
+ "- %u\n", __func__, asoc, len, asoc->rwnd,
asoc->rwnd_over, asoc->a_rwnd);
/* Send a window update SACK if the rwnd has increased by at least the
if (sctp_peer_needs_update(asoc)) {
asoc->a_rwnd = asoc->rwnd;
SCTP_DEBUG_PRINTK("%s: Sending window update SACK- asoc: %p "
- "rwnd: %u a_rwnd: %u\n", __FUNCTION__,
+ "rwnd: %u a_rwnd: %u\n", __func__,
asoc, asoc->rwnd, asoc->a_rwnd);
sack = sctp_make_sack(asoc);
if (!sack)
asoc->rwnd = 0;
}
SCTP_DEBUG_PRINTK("%s: asoc %p rwnd decreased by %d to (%u, %u)\n",
- __FUNCTION__, asoc, len, asoc->rwnd,
+ __func__, asoc, len, asoc->rwnd,
asoc->rwnd_over);
}
/* Use scoping rules to determine the subset of addresses from
* the endpoint.
*/
- scope = sctp_scope(&asoc->peer.active_path->ipaddr_h);
+ scope = sctp_scope(&asoc->peer.active_path->ipaddr);
flags = (PF_INET6 == asoc->base.sk->sk_family) ? SCTP_ADDR6_ALLOWED : 0;
if (asoc->peer.ipv4_address)
flags |= SCTP_ADDR4_PEERSUPP;
asoc->ep->base.bind_addr.port, gfp);
}
-/* Lookup laddr in the bind address list of an association. */
-int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
+/* Lookup laddr in the bind address list of an association. */
+int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
const union sctp_addr *laddr)
{
- int found;
+ int found = 0;
- sctp_read_lock(&asoc->base.addr_lock);
if ((asoc->base.bind_addr.port == ntohs(laddr->v4.sin_port)) &&
sctp_bind_addr_match(&asoc->base.bind_addr, laddr,
- sctp_sk(asoc->base.sk))) {
+ sctp_sk(asoc->base.sk)))
found = 1;
- goto out;
- }
- found = 0;
-out:
- sctp_read_unlock(&asoc->base.addr_lock);
return found;
}
+
+/* Set an association id for a given association */
+int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp)
+{
+ int assoc_id;
+ int error = 0;
+retry:
+ if (unlikely(!idr_pre_get(&sctp_assocs_id, gfp)))
+ return -ENOMEM;
+
+ spin_lock_bh(&sctp_assocs_id_lock);
+ error = idr_get_new_above(&sctp_assocs_id, (void *)asoc,
+ 1, &assoc_id);
+ spin_unlock_bh(&sctp_assocs_id_lock);
+ if (error == -EAGAIN)
+ goto retry;
+ else if (error)
+ return error;
+
+ asoc->assoc_id = (sctp_assoc_t) assoc_id;
+ return error;
+}
+
+/* Free asconf_ack cache */
+static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc)
+{
+ struct sctp_chunk *ack;
+ struct sctp_chunk *tmp;
+
+ list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list,
+ transmitted_list) {
+ list_del_init(&ack->transmitted_list);
+ sctp_chunk_free(ack);
+ }
+}
+
+/* Clean up the ASCONF_ACK queue */
+void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc)
+{
+ struct sctp_chunk *ack;
+ struct sctp_chunk *tmp;
+
+ /* We can remove all the entries from the queue upto
+ * the "Peer-Sequence-Number".
+ */
+ list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list,
+ transmitted_list) {
+ if (ack->subh.addip_hdr->serial ==
+ htonl(asoc->peer.addip_serial))
+ break;
+
+ list_del_init(&ack->transmitted_list);
+ sctp_chunk_free(ack);
+ }
+}
+
+/* Find the ASCONF_ACK whose serial number matches ASCONF */
+struct sctp_chunk *sctp_assoc_lookup_asconf_ack(
+ const struct sctp_association *asoc,
+ __be32 serial)
+{
+ struct sctp_chunk *ack;
+
+ /* Walk through the list of cached ASCONF-ACKs and find the
+ * ack chunk whose serial number matches that of the request.
+ */
+ list_for_each_entry(ack, &asoc->asconf_ack_list, transmitted_list) {
+ if (ack->subh.addip_hdr->serial == serial) {
+ sctp_chunk_hold(ack);
+ return ack;
+ }
+ }
+
+ return NULL;
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff