1 files changed, 389 insertions, 0 deletions

diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
new file mode 100644
index 000000000000..544b75077dbd
--- /dev/null
+++ b/net/sctp/endpointola.c
@@ -0,0 +1,389 @@
+/* SCTP kernel reference Implementation
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001-2002 International Business Machines, Corp.
+ * Copyright (c) 2001 Intel Corp.
+ * Copyright (c) 2001 Nokia, Inc.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ *
+ * This file is part of the SCTP kernel reference Implementation
+ *
+ * This abstraction represents an SCTP endpoint.
+ *
+ * This file is part of the implementation of the add-IP extension,
+ * based on <draft-ietf-tsvwg-addip-sctp-02.txt> June 29, 2001,
+ * for the SCTP kernel reference Implementation.
+ *
+ * The SCTP reference 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
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ *                 ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ *    http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ *    La Monte H.P. Yarroll <piggy@acm.org>
+ *    Karl Knutson <karl@athena.chicago.il.us>
+ *    Jon Grimm <jgrimm@austin.ibm.com>
+ *    Daisy Chang <daisyc@us.ibm.com>
+ *    Dajiang Zhang <dajiang.zhang@nokia.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <linux/random.h>       /* get_random_bytes() */
+#include <linux/crypto.h>
+#include <net/sock.h>
+#include <net/ipv6.h>
+#include <net/sctp/sctp.h>
+#include <net/sctp/sm.h>
+
+/* Forward declarations for internal helpers. */
+static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep);
+
+/*
+ * Initialize the base fields of the endpoint structure.
+ */
+static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
+                                                struct sock *sk, int gfp)
+{
+        struct sctp_sock *sp = sctp_sk(sk);
+        memset(ep, 0, sizeof(struct sctp_endpoint));
+
+        /* Initialize the base structure. */
+        /* What type of endpoint are we?  */
+        ep->base.type = SCTP_EP_TYPE_SOCKET;
+
+        /* Initialize the basic object fields. */
+        atomic_set(&ep->base.refcnt, 1);
+        ep->base.dead = 0;
+        ep->base.malloced = 1;
+
+        /* Create an input queue.  */
+        sctp_inq_init(&ep->base.inqueue);
+
+        /* Set its top-half handler */
+        sctp_inq_set_th_handler(&ep->base.inqueue,
+                                (void (*)(void *))sctp_endpoint_bh_rcv, ep);
+
+        /* Initialize the bind addr area */
+        sctp_bind_addr_init(&ep->base.bind_addr, 0);
+        rwlock_init(&ep->base.addr_lock);
+
+        /* Remember who we are attached to.  */
+        ep->base.sk = sk;
+        sock_hold(ep->base.sk);
+
+        /* Create the lists of associations.  */
+        INIT_LIST_HEAD(&ep->asocs);
+
+        /* Set up the base timeout information.  */
+        ep->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0;
+        ep->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
+                SCTP_DEFAULT_TIMEOUT_T1_COOKIE;
+        ep->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
+                SCTP_DEFAULT_TIMEOUT_T1_INIT;
+        ep->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] =
+                msecs_to_jiffies(sp->rtoinfo.srto_initial);
+        ep->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] = 0;
+        ep->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = 0;
+
+        /* sctpimpguide-05 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'.
+         */
+        ep->timeouts[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD]
+                = 5 * msecs_to_jiffies(sp->rtoinfo.srto_max);
+
+        ep->timeouts[SCTP_EVENT_TIMEOUT_HEARTBEAT] =
+                SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
+        ep->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
+                SCTP_DEFAULT_TIMEOUT_SACK;
+        ep->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] =
+                sp->autoclose * HZ;
+
+        /* Use SCTP specific send buffer space queues.  */
+        sk->sk_write_space = sctp_write_space;
+        sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
+
+        /* Initialize the secret key used with cookie. */
+        get_random_bytes(&ep->secret_key[0], SCTP_SECRET_SIZE);
+        ep->last_key = ep->current_key = 0;
+        ep->key_changed_at = jiffies;
+
+        ep->debug_name = "unnamedEndpoint";
+        return ep;
+}
+
+/* Create a sctp_endpoint with all that boring stuff initialized.
+ * Returns NULL if there isn't enough memory.
+ */
+struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, int gfp)
+{
+        struct sctp_endpoint *ep;
+
+        /* Build a local endpoint. */
+        ep = t_new(struct sctp_endpoint, gfp);
+        if (!ep)
+                goto fail;
+        if (!sctp_endpoint_init(ep, sk, gfp))
+                goto fail_init;
+        ep->base.malloced = 1;
+        SCTP_DBG_OBJCNT_INC(ep);
+        return ep;
+
+fail_init:
+        kfree(ep);
+fail:
+        return NULL;
+}
+
+/* Add an association to an endpoint.  */
+void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
+                            struct sctp_association *asoc)
+{
+        struct sock *sk = ep->base.sk;
+
+        /* Now just add it to our list of asocs */
+        list_add_tail(&asoc->asocs, &ep->asocs);
+
+        /* Increment the backlog value for a TCP-style listening socket. */
+        if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
+                sk->sk_ack_backlog++;
+}
+
+/* Free the endpoint structure.  Delay cleanup until
+ * all users have released their reference count on this structure.
+ */
+void sctp_endpoint_free(struct sctp_endpoint *ep)
+{
+        ep->base.dead = 1;
+        sctp_endpoint_put(ep);
+}
+
+/* Final destructor for endpoint.  */
+static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
+{
+        SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
+
+        ep->base.sk->sk_state = SCTP_SS_CLOSED;
+
+        /* Unlink this endpoint, so we can't find it again! */
+        sctp_unhash_endpoint(ep);
+
+        /* Free up the HMAC transform. */
+        if (sctp_sk(ep->base.sk)->hmac)
+                sctp_crypto_free_tfm(sctp_sk(ep->base.sk)->hmac);
+
+        /* Cleanup. */
+        sctp_inq_free(&ep->base.inqueue);
+        sctp_bind_addr_free(&ep->base.bind_addr);
+
+        /* Remove and free the port */
+        if (sctp_sk(ep->base.sk)->bind_hash)
+                sctp_put_port(ep->base.sk);
+
+        /* Give up our hold on the sock. */
+        if (ep->base.sk)
+                sock_put(ep->base.sk);
+
+        /* Finally, free up our memory. */
+        if (ep->base.malloced) {
+                kfree(ep);
+                SCTP_DBG_OBJCNT_DEC(ep);
+        }
+}
+
+/* Hold a reference to an endpoint. */
+void sctp_endpoint_hold(struct sctp_endpoint *ep)
+{
+        atomic_inc(&ep->base.refcnt);
+}
+
+/* Release a reference to an endpoint and clean up if there are
+ * no more references.
+ */
+void sctp_endpoint_put(struct sctp_endpoint *ep)
+{
+        if (atomic_dec_and_test(&ep->base.refcnt))
+                sctp_endpoint_destroy(ep);
+}
+
+/* Is this the endpoint we are looking for?  */
+struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
+                                               const union sctp_addr *laddr)
+{
+        struct sctp_endpoint *retval;
+
+        sctp_read_lock(&ep->base.addr_lock);
+        if (ep->base.bind_addr.port == laddr->v4.sin_port) {
+                if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
+                                         sctp_sk(ep->base.sk))) {
+                        retval = ep;
+                        goto out;
+                }
+        }
+
+        retval = NULL;
+
+out:
+        sctp_read_unlock(&ep->base.addr_lock);
+        return retval;
+}
+
+/* Find the association that goes with this chunk.
+ * We do a linear search of the associations for this endpoint.
+ * We return the matching transport address too.
+ */
+static struct sctp_association *__sctp_endpoint_lookup_assoc(
+        const struct sctp_endpoint *ep,
+        const union sctp_addr *paddr,
+        struct sctp_transport **transport)
+{
+        int rport;
+        struct sctp_association *asoc;
+        struct list_head *pos;
+
+        rport = paddr->v4.sin_port;
+
+        list_for_each(pos, &ep->asocs) {
+                asoc = list_entry(pos, struct sctp_association, asocs);
+                if (rport == asoc->peer.port) {
+                        sctp_read_lock(&asoc->base.addr_lock);
+                        *transport = sctp_assoc_lookup_paddr(asoc, paddr);
+                        sctp_read_unlock(&asoc->base.addr_lock);
+
+                        if (*transport)
+                                return asoc;
+                }
+        }
+
+        *transport = NULL;
+        return NULL;
+}
+
+/* Lookup association on an endpoint based on a peer address.  BH-safe.  */
+struct sctp_association *sctp_endpoint_lookup_assoc(
+        const struct sctp_endpoint *ep,
+        const union sctp_addr *paddr,
+        struct sctp_transport **transport)
+{
+        struct sctp_association *asoc;
+
+        sctp_local_bh_disable();
+        asoc = __sctp_endpoint_lookup_assoc(ep, paddr, transport);
+        sctp_local_bh_enable();
+
+        return asoc;
+}
+
+/* Look for any peeled off association from the endpoint that matches the
+ * given peer address.
+ */
+int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
+                                const union sctp_addr *paddr)
+{
+        struct list_head *pos;
+        struct sctp_sockaddr_entry *addr;
+        struct sctp_bind_addr *bp;
+
+        sctp_read_lock(&ep->base.addr_lock);
+        bp = &ep->base.bind_addr;
+        list_for_each(pos, &bp->address_list) {
+                addr = list_entry(pos, struct sctp_sockaddr_entry, list);
+                if (sctp_has_association(&addr->a, paddr)) {
+                        sctp_read_unlock(&ep->base.addr_lock);
+                        return 1;
+                }
+        }
+        sctp_read_unlock(&ep->base.addr_lock);
+
+        return 0;
+}
+
+/* Do delayed input processing.  This is scheduled by sctp_rcv().
+ * This may be called on BH or task time.
+ */
+static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep)
+{
+        struct sctp_association *asoc;
+        struct sock *sk;
+        struct sctp_transport *transport;
+        struct sctp_chunk *chunk;
+        struct sctp_inq *inqueue;
+        sctp_subtype_t subtype;
+        sctp_state_t state;
+        int error = 0;
+
+        if (ep->base.dead)
+                return;
+
+        asoc = NULL;
+        inqueue = &ep->base.inqueue;
+        sk = ep->base.sk;
+
+        while (NULL != (chunk = sctp_inq_pop(inqueue))) {
+                subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
+
+                /* We might have grown an association since last we
+                 * looked, so try again.
+                 *
+                 * This happens when we've just processed our
+                 * COOKIE-ECHO chunk.
+                 */
+                if (NULL == chunk->asoc) {
+                        asoc = sctp_endpoint_lookup_assoc(ep,
+                                                          sctp_source(chunk),
+                                                          &transport);
+                        chunk->asoc = asoc;
+                        chunk->transport = transport;
+                }
+
+                state = asoc ? asoc->state : SCTP_STATE_CLOSED;
+
+                /* Remember where the last DATA chunk came from so we
+                 * know where to send the SACK.
+                 */
+                if (asoc && sctp_chunk_is_data(chunk))
+                        asoc->peer.last_data_from = chunk->transport;
+                else
+                        SCTP_INC_STATS(SCTP_MIB_INCTRLCHUNKS);
+
+                if (chunk->transport)
+                        chunk->transport->last_time_heard = jiffies;
+
+                error = sctp_do_sm(SCTP_EVENT_T_CHUNK, subtype, state,
+                                   ep, asoc, chunk, GFP_ATOMIC);
+
+                if (error && chunk)
+                        chunk->pdiscard = 1;
+
+                /* Check to see if the endpoint is freed in response to
+                 * the incoming chunk. If so, get out of the while loop.
+                 */
+                if (!sctp_sk(sk)->ep)
+                        break;
+        }
+}