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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/sctp/endpointola.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/sctp/endpointola.c')
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1 files changed, 389 insertions, 0 deletions
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
new file mode 100644
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+++ b/net/sctp/endpointola.c
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+/* 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;
+ }
+}