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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/sctp/endpointola.c | |
download | kernel_samsung_espresso10-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_espresso10-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_espresso10-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-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')
-rw-r--r-- | net/sctp/endpointola.c | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c new file mode 100644 index 0000000..544b750 --- /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; + } +} |