diff options
Diffstat (limited to 'net/sctp/associola.c')
| -rw-r--r-- | net/sctp/associola.c | 615 |
1 files changed, 339 insertions, 276 deletions
diff --git a/net/sctp/associola.c b/net/sctp/associola.c index 5f1fb8bd862..06a9ee6b2d3 100644 --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -22,16 +22,12 @@ * 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. + * along with GNU CC; see the file COPYING. If not, see + * <http://www.gnu.org/licenses/>. * * 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 + * lksctp developers <linux-sctp@vger.kernel.org> * * Written or modified by: * La Monte H.P. Yarroll <piggy@acm.org> @@ -43,9 +39,6 @@ * Daisy Chang <daisyc@us.ibm.com> * Ryan Layer <rmlayer@us.ibm.com> * Kevin Gao <kevin.gao@intel.com> - * - * Any bugs reported given to us we will try to fix... any fixes shared will - * be incorporated into the next SCTP release. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt @@ -62,15 +55,10 @@ #include <net/sctp/sm.h> /* Forward declarations for internal functions. */ +static void sctp_select_active_and_retran_path(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); - -/* Keep track of the new idr low so that we don't re-use association id - * numbers too fast. It is protected by they idr spin lock is in the - * range of 1 - INT_MAX. - */ -static u32 idr_low = 1; - +static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc); /* 1st Level Abstractions. */ @@ -81,6 +69,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a sctp_scope_t scope, gfp_t gfp) { + struct net *net = sock_net(sk); struct sctp_sock *sp; int i; sctp_paramhdr_t *p; @@ -91,10 +80,9 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a /* Discarding const is appropriate here. */ asoc->ep = (struct sctp_endpoint *)ep; - sctp_endpoint_hold(asoc->ep); - - /* Hold the sock. */ asoc->base.sk = (struct sock *)sk; + + sctp_endpoint_hold(asoc->ep); sock_hold(asoc->base.sk); /* Initialize the common base substructure. */ @@ -102,33 +90,24 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a /* Initialize the object handling fields. */ atomic_set(&asoc->base.refcnt, 1); - asoc->base.dead = 0; - asoc->base.malloced = 0; /* Initialize the bind addr area. */ sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port); asoc->state = SCTP_STATE_CLOSED; - - /* Set these values from the socket values, a conversion between - * millsecons to seconds/microseconds must also be done. - */ - asoc->cookie_life.tv_sec = sp->assocparams.sasoc_cookie_life / 1000; - asoc->cookie_life.tv_usec = (sp->assocparams.sasoc_cookie_life % 1000) - * 1000; - asoc->frag_point = 0; + asoc->cookie_life = ms_to_ktime(sp->assocparams.sasoc_cookie_life); asoc->user_frag = sp->user_frag; /* Set the association max_retrans and RTO values from the * socket values. */ asoc->max_retrans = sp->assocparams.sasoc_asocmaxrxt; + asoc->pf_retrans = net->sctp.pf_retrans; + asoc->rto_initial = msecs_to_jiffies(sp->rtoinfo.srto_initial); asoc->rto_max = msecs_to_jiffies(sp->rtoinfo.srto_max); asoc->rto_min = msecs_to_jiffies(sp->rtoinfo.srto_min); - asoc->overall_error_count = 0; - /* Initialize the association's heartbeat interval based on the * sock configured value. */ @@ -149,18 +128,15 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a */ asoc->param_flags = sp->param_flags; - /* Initialize the maximum mumber of new data packets that can be sent + /* Initialize the maximum number of new data packets that can be sent * in a burst. */ asoc->max_burst = sp->max_burst; /* 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 @@ -169,10 +145,8 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a 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] = - (unsigned long)sp->autoclose * HZ; + asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] = sp->autoclose * HZ; /* Initializes the timers */ for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) @@ -190,11 +164,6 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a asoc->max_init_timeo = msecs_to_jiffies(sp->initmsg.sinit_max_init_timeo); - /* Allocate storage for the ssnmap after the inbound and outbound - * streams have been negotiated during Init. - */ - asoc->ssnmap = NULL; - /* Set the local window size for receive. * This is also the rcvbuf space per association. * RFC 6 - A SCTP receiver MUST be able to receive a minimum of @@ -207,25 +176,15 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a asoc->a_rwnd = asoc->rwnd; - asoc->rwnd_over = 0; - asoc->rwnd_press = 0; - /* Use my own max window until I learn something better. */ asoc->peer.rwnd = SCTP_DEFAULT_MAXWINDOW; - /* 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->peer.i.init_tag = 0; /* INIT needs a vtag of 0. */ - 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); @@ -236,7 +195,6 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a asoc->adv_peer_ack_point = asoc->ctsn_ack_point; asoc->highest_sacked = asoc->ctsn_ack_point; asoc->last_cwr_tsn = asoc->ctsn_ack_point; - asoc->unack_data = 0; /* ADDIP Section 4.1 Asconf Chunk Procedures * @@ -255,7 +213,6 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a /* 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 * @@ -269,15 +226,14 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a * already received one packet.] */ asoc->peer.sack_needed = 1; - asoc->peer.sack_cnt = 0; + asoc->peer.sack_generation = 1; /* 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 + * The sctp_addip_noauth option is there for backward compatibility * and will revert old behavior. */ - asoc->peer.asconf_capable = 0; - if (sctp_addip_noauth) + if (net->sctp.addip_noauth) asoc->peer.asconf_capable = 1; /* Create an input queue. */ @@ -290,12 +246,6 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a if (!sctp_ulpq_init(&asoc->ulpq, asoc)) goto fail_init; - memset(&asoc->peer.tsn_map, 0, sizeof(struct sctp_tsnmap)); - - asoc->need_ecne = 0; - - asoc->assoc_id = 0; - /* Assume that peer would support both address types unless we are * told otherwise. */ @@ -304,8 +254,6 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a asoc->peer.ipv6_address = 1; INIT_LIST_HEAD(&asoc->asocs); - asoc->autoclose = sp->autoclose; - asoc->default_stream = sp->default_stream; asoc->default_ppid = sp->default_ppid; asoc->default_flags = sp->default_flags; @@ -320,9 +268,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a 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, @@ -340,8 +286,8 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a return asoc; fail_init: - sctp_endpoint_put(asoc->ep); sock_put(asoc->base.sk); + sctp_endpoint_put(asoc->ep); return NULL; } @@ -353,16 +299,16 @@ struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep, { struct sctp_association *asoc; - asoc = t_new(struct sctp_association, gfp); + asoc = kzalloc(sizeof(*asoc), 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); + + pr_debug("Created asoc %p\n", asoc); return asoc; @@ -385,7 +331,7 @@ void sctp_association_free(struct sctp_association *asoc) /* Only real associations count against the endpoint, so * don't bother for if this is a temporary association. */ - if (!asoc->temp) { + if (!list_empty(&asoc->asocs)) { list_del(&asoc->asocs); /* Decrement the backlog value for a TCP-style listening @@ -398,7 +344,7 @@ void sctp_association_free(struct sctp_association *asoc) /* Mark as dead, so other users can know this structure is * going away. */ - asoc->base.dead = 1; + asoc->base.dead = true; /* Dispose of any data lying around in the outqueue. */ sctp_outq_free(&asoc->outqueue); @@ -423,8 +369,7 @@ void sctp_association_free(struct sctp_association *asoc) * on our state. */ for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) { - if (timer_pending(&asoc->timers[i]) && - del_timer(&asoc->timers[i])) + if (del_timer(&asoc->timers[i])) sctp_association_put(asoc); } @@ -437,18 +382,17 @@ void sctp_association_free(struct sctp_association *asoc) /* Release the transport structures. */ list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { transport = list_entry(pos, struct sctp_transport, transports); - list_del(pos); + list_del_rcu(pos); sctp_transport_free(transport); } asoc->peer.transport_count = 0; - /* Free any cached ASCONF_ACK chunk. */ - sctp_assoc_free_asconf_acks(asoc); + sctp_asconf_queue_teardown(asoc); - /* Free any cached ASCONF chunk. */ - if (asoc->addip_last_asconf) - sctp_chunk_free(asoc->addip_last_asconf); + /* Free pending address space being deleted */ + if (asoc->asconf_addr_del_pending != NULL) + kfree(asoc->asconf_addr_del_pending); /* AUTH - Free the endpoint shared keys */ sctp_auth_destroy_keys(&asoc->endpoint_shared_keys); @@ -462,7 +406,10 @@ void sctp_association_free(struct sctp_association *asoc) /* Cleanup and free up an association. */ static void sctp_association_destroy(struct sctp_association *asoc) { - SCTP_ASSERT(asoc->base.dead, "Assoc is not dead", return); + if (unlikely(!asoc->base.dead)) { + WARN(1, "Attempt to destroy undead association %p!\n", asoc); + return; + } sctp_endpoint_put(asoc->ep); sock_put(asoc->base.sk); @@ -475,10 +422,8 @@ static void sctp_association_destroy(struct sctp_association *asoc) WARN_ON(atomic_read(&asoc->rmem_alloc)); - if (asoc->base.malloced) { - kfree(asoc); - SCTP_DBG_OBJCNT_DEC(assoc); - } + kfree(asoc); + SCTP_DBG_OBJCNT_DEC(assoc); } /* Change the primary destination address for the peer. */ @@ -545,11 +490,8 @@ void sctp_assoc_rm_peer(struct sctp_association *asoc, 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), - ntohs(peer->ipaddr.v4.sin_port)); + pr_debug("%s: association:%p addr:%pISpc\n", + __func__, asoc, &peer->ipaddr.sa); /* If we are to remove the current retran_path, update it * to the next peer before removing this peer from the list. @@ -558,7 +500,7 @@ void sctp_assoc_rm_peer(struct sctp_association *asoc, sctp_assoc_update_retran_path(asoc); /* Remove this peer from the list. */ - list_del(&peer->transports); + list_del_rcu(&peer->transports); /* Get the first transport of asoc. */ pos = asoc->peer.transport_addr_list.next; @@ -569,6 +511,8 @@ void sctp_assoc_rm_peer(struct sctp_association *asoc, 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; @@ -614,7 +558,7 @@ void sctp_assoc_rm_peer(struct sctp_association *asoc, /* Start a T3 timer here in case it wasn't running so * that these migrated packets have a chance to get - * retrnasmitted. + * retransmitted. */ if (!timer_pending(&active->T3_rtx_timer)) if (!mod_timer(&active->T3_rtx_timer, @@ -633,6 +577,7 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, const gfp_t gfp, const int peer_state) { + struct net *net = sock_net(asoc->base.sk); struct sctp_transport *peer; struct sctp_sock *sp; unsigned short port; @@ -642,12 +587,8 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, /* AF_INET and AF_INET6 share common port field. */ port = ntohs(addr->v4.sin_port); - SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ", - " port: %d state:%d\n", - asoc, - addr, - port, - peer_state); + pr_debug("%s: association:%p addr:%pISpc state:%d\n", __func__, + asoc, &addr->sa, peer_state); /* Set the port if it has not been set yet. */ if (0 == asoc->peer.port) @@ -666,7 +607,7 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, return peer; } - peer = sctp_transport_new(addr, gfp); + peer = sctp_transport_new(net, addr, gfp); if (!peer) return NULL; @@ -680,6 +621,9 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, /* Set the path max_retrans. */ peer->pathmaxrxt = asoc->pathmaxrxt; + /* And the partial failure retrans threshold */ + peer->pf_retrans = asoc->pf_retrans; + /* Initialize the peer's SACK delay timeout based on the * association configured value. */ @@ -711,8 +655,9 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, else asoc->pathmtu = peer->pathmtu; - SCTP_DEBUG_PRINTK("sctp_assoc_add_peer:association %p PMTU set to " - "%d\n", asoc, asoc->pathmtu); + pr_debug("%s: association:%p PMTU set to %d\n", __func__, asoc, + asoc->pathmtu); + peer->pmtu_pending = 0; asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); @@ -747,12 +692,13 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, /* Set the transport's RTO.initial value */ peer->rto = asoc->rto_initial; + sctp_max_rto(asoc, peer); /* 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); + list_add_tail_rcu(&peer->transports, &asoc->peer.transport_addr_list); asoc->peer.transport_count++; /* If we do not yet have a primary path, set one. */ @@ -829,12 +775,10 @@ void sctp_assoc_control_transport(struct sctp_association *asoc, sctp_transport_cmd_t command, sctp_sn_error_t error) { - struct sctp_transport *t = NULL; - struct sctp_transport *first; - struct sctp_transport *second; struct sctp_ulpevent *event; struct sockaddr_storage addr; int spc_state = 0; + bool ulp_notify = true; /* Record the transition on the transport. */ switch (command) { @@ -848,6 +792,14 @@ void sctp_assoc_control_transport(struct sctp_association *asoc, spc_state = SCTP_ADDR_CONFIRMED; else spc_state = SCTP_ADDR_AVAILABLE; + /* Don't inform ULP about transition from PF to + * active state and set cwnd to 1 MTU, see SCTP + * Quick failover draft section 5.1, point 5 + */ + if (transport->state == SCTP_PF) { + ulp_notify = false; + transport->cwnd = asoc->pathmtu; + } transport->state = SCTP_ACTIVE; break; @@ -866,72 +818,31 @@ void sctp_assoc_control_transport(struct sctp_association *asoc, spc_state = SCTP_ADDR_UNREACHABLE; break; + case SCTP_TRANSPORT_PF: + transport->state = SCTP_PF; + ulp_notify = false; + break; + default: return; } - /* Generate and send a SCTP_PEER_ADDR_CHANGE notification to the - * user. - */ - memset(&addr, 0, sizeof(struct sockaddr_storage)); - 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) - sctp_ulpq_tail_event(&asoc->ulpq, event); - - /* Select new active and retran paths. */ - - /* Look for the two most recently used active transports. - * - * This code produces the wrong ordering whenever jiffies - * rolls over, but we still get usable transports, so we don't - * worry about it. + /* Generate and send a SCTP_PEER_ADDR_CHANGE notification + * to the user. */ - first = NULL; second = NULL; - - list_for_each_entry(t, &asoc->peer.transport_addr_list, - transports) { - - if ((t->state == SCTP_INACTIVE) || - (t->state == SCTP_UNCONFIRMED)) - continue; - if (!first || t->last_time_heard > first->last_time_heard) { - second = first; - first = t; - } - if (!second || t->last_time_heard > second->last_time_heard) - second = t; + if (ulp_notify) { + memset(&addr, 0, sizeof(struct sockaddr_storage)); + 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) + sctp_ulpq_tail_event(&asoc->ulpq, event); } - /* RFC 2960 6.4 Multi-Homed SCTP Endpoints - * - * By default, an endpoint should always transmit to the - * primary path, unless the SCTP user explicitly specifies the - * destination transport address (and possibly source - * transport address) to use. - * - * [If the primary is active but not most recent, bump the most - * recently used transport.] - */ - if (((asoc->peer.primary_path->state == SCTP_ACTIVE) || - (asoc->peer.primary_path->state == SCTP_UNKNOWN)) && - first != asoc->peer.primary_path) { - second = first; - first = asoc->peer.primary_path; - } - - /* If we failed to find a usable transport, just camp on the - * primary, even if it is inactive. - */ - if (!first) { - first = asoc->peer.primary_path; - second = asoc->peer.primary_path; - } - - /* Set the active and retran transports. */ - asoc->peer.active_path = first; - asoc->peer.retran_path = second; + /* Select new active and retran paths. */ + sctp_select_active_and_retran_path(asoc); } /* Hold a reference to an association. */ @@ -987,17 +898,13 @@ int sctp_cmp_addr_exact(const union sctp_addr *ss1, */ struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc) { - struct sctp_chunk *chunk; + if (!asoc->need_ecne) + return NULL; /* Send ECNE if needed. * Not being able to allocate a chunk here is not deadly. */ - if (asoc->need_ecne) - chunk = sctp_make_ecne(asoc, asoc->last_ecne_tsn); - else - chunk = NULL; - - return chunk; + return sctp_make_ecne(asoc, asoc->last_ecne_tsn); } /* @@ -1045,7 +952,7 @@ struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *asoc, transports) { if (transport == active) - break; + continue; list_for_each_entry(chunk, &transport->transmitted, transmitted_list) { if (key == chunk->subh.data_hdr->tsn) { @@ -1060,13 +967,15 @@ out: /* Is this the association we are looking for? */ struct sctp_transport *sctp_assoc_is_match(struct sctp_association *asoc, + struct net *net, const union sctp_addr *laddr, const union sctp_addr *paddr) { struct sctp_transport *transport; if ((htons(asoc->base.bind_addr.port) == laddr->v4.sin_port) && - (htons(asoc->peer.port) == paddr->v4.sin_port)) { + (htons(asoc->peer.port) == paddr->v4.sin_port) && + net_eq(sock_net(asoc->base.sk), net)) { transport = sctp_assoc_lookup_paddr(asoc, paddr); if (!transport) goto out; @@ -1087,9 +996,9 @@ static void sctp_assoc_bh_rcv(struct work_struct *work) struct sctp_association *asoc = container_of(work, struct sctp_association, base.inqueue.immediate); + struct net *net = sock_net(asoc->base.sk); struct sctp_endpoint *ep; struct sctp_chunk *chunk; - struct sock *sk; struct sctp_inq *inqueue; int state; sctp_subtype_t subtype; @@ -1097,7 +1006,6 @@ static void sctp_assoc_bh_rcv(struct work_struct *work) /* The association should be held so we should be safe. */ ep = asoc->ep; - sk = asoc->base.sk; inqueue = &asoc->base.inqueue; sctp_association_hold(asoc); @@ -1120,14 +1028,18 @@ static void sctp_assoc_bh_rcv(struct work_struct *work) */ if (sctp_chunk_is_data(chunk)) asoc->peer.last_data_from = chunk->transport; - else - SCTP_INC_STATS(SCTP_MIB_INCTRLCHUNKS); + else { + SCTP_INC_STATS(net, SCTP_MIB_INCTRLCHUNKS); + asoc->stats.ictrlchunks++; + if (chunk->chunk_hdr->type == SCTP_CID_SACK) + asoc->stats.isacks++; + } if (chunk->transport) - chunk->transport->last_time_heard = jiffies; + chunk->transport->last_time_heard = ktime_get(); /* Run through the state machine. */ - error = sctp_do_sm(SCTP_EVENT_T_CHUNK, subtype, + error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, state, ep, asoc, chunk, GFP_ATOMIC); /* Check to see if the association is freed in response to @@ -1185,6 +1097,7 @@ void sctp_assoc_update(struct sctp_association *asoc, asoc->c = new->c; asoc->peer.rwnd = new->peer.rwnd; asoc->peer.sack_needed = new->peer.sack_needed; + asoc->peer.auth_capable = new->peer.auth_capable; asoc->peer.i = new->peer.i; sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, asoc->peer.i.initial_tsn, GFP_ATOMIC); @@ -1253,7 +1166,7 @@ void sctp_assoc_update(struct sctp_association *asoc, } } - /* SCTP-AUTH: Save the peer parameters from the new assocaitions + /* SCTP-AUTH: Save the peer parameters from the new associations * and also move the association shared keys over */ kfree(asoc->peer.peer_random); @@ -1273,80 +1186,204 @@ void sctp_assoc_update(struct sctp_association *asoc, } /* Update the retran path for sending a retransmitted packet. - * Round-robin through the active transports, else round-robin - * through the inactive transports as this is the next best thing - * we can try. + * See also RFC4960, 6.4. Multi-Homed SCTP Endpoints: + * + * When there is outbound data to send and the primary path + * becomes inactive (e.g., due to failures), or where the + * SCTP user explicitly requests to send data to an + * inactive destination transport address, before reporting + * an error to its ULP, the SCTP endpoint should try to send + * the data to an alternate active destination transport + * address if one exists. + * + * When retransmitting data that timed out, if the endpoint + * is multihomed, it should consider each source-destination + * address pair in its retransmission selection policy. + * When retransmitting timed-out data, the endpoint should + * attempt to pick the most divergent source-destination + * pair from the original source-destination pair to which + * the packet was transmitted. + * + * Note: Rules for picking the most divergent source-destination + * pair are an implementation decision and are not specified + * within this document. + * + * Our basic strategy is to round-robin transports in priorities + * according to sctp_state_prio_map[] e.g., if no such + * transport with state SCTP_ACTIVE exists, round-robin through + * SCTP_UNKNOWN, etc. You get the picture. */ +static const u8 sctp_trans_state_to_prio_map[] = { + [SCTP_ACTIVE] = 3, /* best case */ + [SCTP_UNKNOWN] = 2, + [SCTP_PF] = 1, + [SCTP_INACTIVE] = 0, /* worst case */ +}; + +static u8 sctp_trans_score(const struct sctp_transport *trans) +{ + return sctp_trans_state_to_prio_map[trans->state]; +} + +static struct sctp_transport *sctp_trans_elect_tie(struct sctp_transport *trans1, + struct sctp_transport *trans2) +{ + if (trans1->error_count > trans2->error_count) { + return trans2; + } else if (trans1->error_count == trans2->error_count && + ktime_after(trans2->last_time_heard, + trans1->last_time_heard)) { + return trans2; + } else { + return trans1; + } +} + +static struct sctp_transport *sctp_trans_elect_best(struct sctp_transport *curr, + struct sctp_transport *best) +{ + u8 score_curr, score_best; + + if (best == NULL) + return curr; + + score_curr = sctp_trans_score(curr); + score_best = sctp_trans_score(best); + + /* First, try a score-based selection if both transport states + * differ. If we're in a tie, lets try to make a more clever + * decision here based on error counts and last time heard. + */ + if (score_curr > score_best) + return curr; + else if (score_curr == score_best) + return sctp_trans_elect_tie(curr, best); + else + return best; +} + void sctp_assoc_update_retran_path(struct sctp_association *asoc) { - struct sctp_transport *t, *next; - struct list_head *head = &asoc->peer.transport_addr_list; - struct list_head *pos; + struct sctp_transport *trans = asoc->peer.retran_path; + struct sctp_transport *trans_next = NULL; + /* We're done as we only have the one and only path. */ if (asoc->peer.transport_count == 1) return; + /* If active_path and retran_path are the same and active, + * then this is the only active path. Use it. + */ + if (asoc->peer.active_path == asoc->peer.retran_path && + asoc->peer.active_path->state == SCTP_ACTIVE) + return; - /* Find the next transport in a round-robin fashion. */ - t = asoc->peer.retran_path; - pos = &t->transports; - next = NULL; + /* Iterate from retran_path's successor back to retran_path. */ + for (trans = list_next_entry(trans, transports); 1; + trans = list_next_entry(trans, transports)) { + /* Manually skip the head element. */ + if (&trans->transports == &asoc->peer.transport_addr_list) + continue; + if (trans->state == SCTP_UNCONFIRMED) + continue; + trans_next = sctp_trans_elect_best(trans, trans_next); + /* Active is good enough for immediate return. */ + if (trans_next->state == SCTP_ACTIVE) + break; + /* We've reached the end, time to update path. */ + if (trans == asoc->peer.retran_path) + break; + } - while (1) { - /* Skip the head. */ - if (pos->next == head) - pos = head->next; - else - pos = pos->next; + asoc->peer.retran_path = trans_next; - t = list_entry(pos, struct sctp_transport, transports); + pr_debug("%s: association:%p updated new path to addr:%pISpc\n", + __func__, asoc, &asoc->peer.retran_path->ipaddr.sa); +} - /* We have exhausted the list, but didn't find any - * other active transports. If so, use the next - * transport. +static void sctp_select_active_and_retran_path(struct sctp_association *asoc) +{ + struct sctp_transport *trans, *trans_pri = NULL, *trans_sec = NULL; + struct sctp_transport *trans_pf = NULL; + + /* Look for the two most recently used active transports. */ + list_for_each_entry(trans, &asoc->peer.transport_addr_list, + transports) { + /* Skip uninteresting transports. */ + if (trans->state == SCTP_INACTIVE || + trans->state == SCTP_UNCONFIRMED) + continue; + /* Keep track of the best PF transport from our + * list in case we don't find an active one. */ - if (t == asoc->peer.retran_path) { - t = next; - break; + if (trans->state == SCTP_PF) { + trans_pf = sctp_trans_elect_best(trans, trans_pf); + continue; } - - /* Try to find an active transport. */ - - if ((t->state == SCTP_ACTIVE) || - (t->state == SCTP_UNKNOWN)) { - break; - } else { - /* Keep track of the next transport in case - * we don't find any active transport. - */ - if (t->state != SCTP_UNCONFIRMED && !next) - next = t; + /* For active transports, pick the most recent ones. */ + if (trans_pri == NULL || + ktime_after(trans->last_time_heard, + trans_pri->last_time_heard)) { + trans_sec = trans_pri; + trans_pri = trans; + } else if (trans_sec == NULL || + ktime_after(trans->last_time_heard, + trans_sec->last_time_heard)) { + trans_sec = trans; } } - if (t) - asoc->peer.retran_path = t; + /* RFC 2960 6.4 Multi-Homed SCTP Endpoints + * + * By default, an endpoint should always transmit to the primary + * path, unless the SCTP user explicitly specifies the + * destination transport address (and possibly source transport + * address) to use. [If the primary is active but not most recent, + * bump the most recently used transport.] + */ + if ((asoc->peer.primary_path->state == SCTP_ACTIVE || + asoc->peer.primary_path->state == SCTP_UNKNOWN) && + asoc->peer.primary_path != trans_pri) { + trans_sec = trans_pri; + trans_pri = asoc->peer.primary_path; + } + + /* We did not find anything useful for a possible retransmission + * path; either primary path that we found is the the same as + * the current one, or we didn't generally find an active one. + */ + if (trans_sec == NULL) + trans_sec = trans_pri; + + /* If we failed to find a usable transport, just camp on the + * primary or retran, even if they are inactive, if possible + * pick a PF iff it's the better choice. + */ + if (trans_pri == NULL) { + trans_pri = sctp_trans_elect_best(asoc->peer.primary_path, + asoc->peer.retran_path); + trans_pri = sctp_trans_elect_best(trans_pri, trans_pf); + trans_sec = asoc->peer.primary_path; + } - SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association" - " %p addr: ", - " port: %d\n", - asoc, - (&t->ipaddr), - ntohs(t->ipaddr.v4.sin_port)); + /* Set the active and retran transports. */ + asoc->peer.active_path = trans_pri; + asoc->peer.retran_path = trans_sec; } -/* Choose the transport for sending retransmit packet. */ -struct sctp_transport *sctp_assoc_choose_alter_transport( - struct sctp_association *asoc, struct sctp_transport *last_sent_to) +struct sctp_transport * +sctp_assoc_choose_alter_transport(struct sctp_association *asoc, + struct sctp_transport *last_sent_to) { /* If this is the first time packet is sent, use the active path, * else use the retran path. If the last packet was sent over the * retran path, update the retran path and use it. */ - if (!last_sent_to) + if (last_sent_to == NULL) { return asoc->peer.active_path; - else { + } else { if (last_sent_to == asoc->peer.retran_path) sctp_assoc_update_retran_path(asoc); + return asoc->peer.retran_path; } } @@ -1354,7 +1391,7 @@ struct sctp_transport *sctp_assoc_choose_alter_transport( /* Update the association's pmtu and frag_point by going through all the * transports. This routine is called when a transport's PMTU has changed. */ -void sctp_assoc_sync_pmtu(struct sctp_association *asoc) +void sctp_assoc_sync_pmtu(struct sock *sk, struct sctp_association *asoc) { struct sctp_transport *t; __u32 pmtu = 0; @@ -1366,7 +1403,7 @@ void sctp_assoc_sync_pmtu(struct sctp_association *asoc) 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)); + sctp_transport_update_pmtu(sk, t, dst_mtu(t->dst)); t->pmtu_pending = 0; } if (!pmtu || (t->pathmtu < pmtu)) @@ -1378,13 +1415,14 @@ void sctp_assoc_sync_pmtu(struct sctp_association *asoc) asoc->frag_point = sctp_frag_point(asoc, pmtu); } - SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n", - __func__, asoc, asoc->pathmtu, asoc->frag_point); + pr_debug("%s: asoc:%p, pmtu:%d, frag_point:%d\n", __func__, asoc, + asoc->pathmtu, asoc->frag_point); } /* Should we send a SACK to update our peer? */ -static inline int sctp_peer_needs_update(struct sctp_association *asoc) +static inline bool sctp_peer_needs_update(struct sctp_association *asoc) { + struct net *net = sock_net(asoc->base.sk); switch (asoc->state) { case SCTP_STATE_ESTABLISHED: case SCTP_STATE_SHUTDOWN_PENDING: @@ -1392,18 +1430,18 @@ static inline int sctp_peer_needs_update(struct sctp_association *asoc) case SCTP_STATE_SHUTDOWN_SENT: if ((asoc->rwnd > asoc->a_rwnd) && ((asoc->rwnd - asoc->a_rwnd) >= max_t(__u32, - (asoc->base.sk->sk_rcvbuf >> sctp_rwnd_upd_shift), + (asoc->base.sk->sk_rcvbuf >> net->sctp.rwnd_upd_shift), asoc->pathmtu))) - return 1; + return true; break; default: break; } - return 0; + return false; } /* Increase asoc's rwnd by len and send any window update SACK if needed. */ -void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned len) +void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned int len) { struct sctp_chunk *sack; struct timer_list *timer; @@ -1430,9 +1468,9 @@ void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned len) asoc->rwnd_press -= change; } - SCTP_DEBUG_PRINTK("%s: asoc %p rwnd increased by %d to (%u, %u) " - "- %u\n", __func__, asoc, len, asoc->rwnd, - asoc->rwnd_over, asoc->a_rwnd); + pr_debug("%s: asoc:%p rwnd increased by %d to (%u, %u) - %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 * minimum of the association's PMTU and half of the receive buffer. @@ -1441,9 +1479,11 @@ void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned len) */ 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", __func__, - asoc, asoc->rwnd, asoc->a_rwnd); + + pr_debug("%s: sending window update SACK- asoc:%p rwnd:%u " + "a_rwnd:%u\n", __func__, asoc, asoc->rwnd, + asoc->a_rwnd); + sack = sctp_make_sack(asoc); if (!sack) return; @@ -1454,19 +1494,21 @@ void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned len) /* Stop the SACK timer. */ timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK]; - if (timer_pending(timer) && del_timer(timer)) + if (del_timer(timer)) sctp_association_put(asoc); } } /* Decrease asoc's rwnd by len. */ -void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned len) +void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned int len) { int rx_count; int over = 0; - SCTP_ASSERT(asoc->rwnd, "rwnd zero", return); - SCTP_ASSERT(!asoc->rwnd_over, "rwnd_over not zero", return); + if (unlikely(!asoc->rwnd || asoc->rwnd_over)) + pr_debug("%s: association:%p has asoc->rwnd:%u, " + "asoc->rwnd_over:%u!\n", __func__, asoc, + asoc->rwnd, asoc->rwnd_over); if (asoc->ep->rcvbuf_policy) rx_count = atomic_read(&asoc->rmem_alloc); @@ -1475,7 +1517,7 @@ void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned len) /* If we've reached or overflowed our receive buffer, announce * a 0 rwnd if rwnd would still be positive. Store the - * the pottential pressure overflow so that the window can be restored + * the potential pressure overflow so that the window can be restored * back to original value. */ if (rx_count >= asoc->base.sk->sk_rcvbuf) @@ -1491,9 +1533,10 @@ void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned len) asoc->rwnd_over = len - asoc->rwnd; asoc->rwnd = 0; } - SCTP_DEBUG_PRINTK("%s: asoc %p rwnd decreased by %d to (%u, %u, %u)\n", - __func__, asoc, len, asoc->rwnd, - asoc->rwnd_over, asoc->rwnd_press); + + pr_debug("%s: asoc:%p rwnd decreased by %d to (%u, %u, %u)\n", + __func__, asoc, len, asoc->rwnd, asoc->rwnd_over, + asoc->rwnd_press); } /* Build the bind address list for the association based on info from the @@ -1513,7 +1556,8 @@ int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, if (asoc->peer.ipv6_address) flags |= SCTP_ADDR6_PEERSUPP; - return sctp_bind_addr_copy(&asoc->base.bind_addr, + return sctp_bind_addr_copy(sock_net(asoc->base.sk), + &asoc->base.bind_addr, &asoc->ep->base.bind_addr, scope, gfp, flags); } @@ -1548,32 +1592,38 @@ int sctp_assoc_lookup_laddr(struct sctp_association *asoc, /* 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; + bool preload = !!(gfp & __GFP_WAIT); + int ret; /* If the id is already assigned, keep it. */ if (asoc->assoc_id) - return error; -retry: - if (unlikely(!idr_pre_get(&sctp_assocs_id, gfp))) - return -ENOMEM; + return 0; + if (preload) + idr_preload(gfp); spin_lock_bh(&sctp_assocs_id_lock); - error = idr_get_new_above(&sctp_assocs_id, (void *)asoc, - idr_low, &assoc_id); - if (!error) { - idr_low = assoc_id + 1; - if (idr_low == INT_MAX) - idr_low = 1; - } + /* 0 is not a valid assoc_id, must be >= 1 */ + ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, 1, 0, GFP_NOWAIT); spin_unlock_bh(&sctp_assocs_id_lock); - if (error == -EAGAIN) - goto retry; - else if (error) - return error; + if (preload) + idr_preload_end(); + if (ret < 0) + return ret; - asoc->assoc_id = (sctp_assoc_t) assoc_id; - return error; + asoc->assoc_id = (sctp_assoc_t)ret; + return 0; +} + +/* Free the ASCONF queue */ +static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc) +{ + struct sctp_chunk *asconf; + struct sctp_chunk *tmp; + + list_for_each_entry_safe(asconf, tmp, &asoc->addip_chunk_list, list) { + list_del_init(&asconf->list); + sctp_chunk_free(asconf); + } } /* Free asconf_ack cache */ @@ -1595,7 +1645,7 @@ 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 + /* We can remove all the entries from the queue up to * the "Peer-Sequence-Number". */ list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, @@ -1628,3 +1678,16 @@ struct sctp_chunk *sctp_assoc_lookup_asconf_ack( return NULL; } + +void sctp_asconf_queue_teardown(struct sctp_association *asoc) +{ + /* Free any cached ASCONF_ACK chunk. */ + sctp_assoc_free_asconf_acks(asoc); + + /* Free the ASCONF queue. */ + sctp_assoc_free_asconf_queue(asoc); + + /* Free any cached ASCONF chunk. */ + if (asoc->addip_last_asconf) + sctp_chunk_free(asoc->addip_last_asconf); +} |