diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index 6df1ce7a411c..5a404c354f4c 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -847,6 +847,11 @@ struct sctp_transport { */ ktime_t last_time_heard; + /* When was the last time that we sent a chunk using this + * transport? We use this to check for idle transports + */ + unsigned long last_time_sent; + /* Last time(in jiffies) when cwnd is reduced due to the congestion * indication based on ECNE chunk. */ @@ -952,7 +957,8 @@ void sctp_transport_route(struct sctp_transport *, union sctp_addr *, struct sctp_sock *); void sctp_transport_pmtu(struct sctp_transport *, struct sock *sk); void sctp_transport_free(struct sctp_transport *); -void sctp_transport_reset_timers(struct sctp_transport *); +void sctp_transport_reset_t3_rtx(struct sctp_transport *); +void sctp_transport_reset_hb_timer(struct sctp_transport *); int sctp_transport_hold(struct sctp_transport *); void sctp_transport_put(struct sctp_transport *); void sctp_transport_update_rto(struct sctp_transport *, __u32); diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c index 8d3d3625130e..084718f9b3da 100644 --- a/net/sctp/outqueue.c +++ b/net/sctp/outqueue.c @@ -866,8 +866,10 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp) * sender MUST assure that at least one T3-rtx * timer is running. */ - if (chunk->chunk_hdr->type == SCTP_CID_FWD_TSN) - sctp_transport_reset_timers(transport); + if (chunk->chunk_hdr->type == SCTP_CID_FWD_TSN) { + sctp_transport_reset_t3_rtx(transport); + transport->last_time_sent = jiffies; + } } break; @@ -924,8 +926,10 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp) error = sctp_outq_flush_rtx(q, packet, rtx_timeout, &start_timer); - if (start_timer) - sctp_transport_reset_timers(transport); + if (start_timer) { + sctp_transport_reset_t3_rtx(transport); + transport->last_time_sent = jiffies; + } /* This can happen on COOKIE-ECHO resend. Only * one chunk can get bundled with a COOKIE-ECHO. @@ -1062,7 +1066,8 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp) list_add_tail(&chunk->transmitted_list, &transport->transmitted); - sctp_transport_reset_timers(transport); + sctp_transport_reset_t3_rtx(transport); + transport->last_time_sent = jiffies; /* Only let one DATA chunk get bundled with a * COOKIE-ECHO chunk. diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 7f0bf798205b..56f364d8f932 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -3080,8 +3080,7 @@ static __be16 sctp_process_asconf_param(struct sctp_association *asoc, return SCTP_ERROR_RSRC_LOW; /* Start the heartbeat timer. */ - if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer))) - sctp_transport_hold(peer); + sctp_transport_reset_hb_timer(peer); asoc->new_transport = peer; break; case SCTP_PARAM_DEL_IP: diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c index 7fe56d0acabf..41b081a64752 100644 --- a/net/sctp/sm_sideeffect.c +++ b/net/sctp/sm_sideeffect.c @@ -69,8 +69,6 @@ static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, sctp_cmd_seq_t *commands, gfp_t gfp); -static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, - struct sctp_transport *t); /******************************************************************** * Helper functions ********************************************************************/ @@ -367,6 +365,7 @@ void sctp_generate_heartbeat_event(unsigned long data) struct sctp_association *asoc = transport->asoc; struct sock *sk = asoc->base.sk; struct net *net = sock_net(sk); + u32 elapsed, timeout; bh_lock_sock(sk); if (sock_owned_by_user(sk)) { @@ -378,6 +377,16 @@ void sctp_generate_heartbeat_event(unsigned long data) goto out_unlock; } + /* Check if we should still send the heartbeat or reschedule */ + elapsed = jiffies - transport->last_time_sent; + timeout = sctp_transport_timeout(transport); + if (elapsed < timeout) { + elapsed = timeout - elapsed; + if (!mod_timer(&transport->hb_timer, jiffies + elapsed)) + sctp_transport_hold(transport); + goto out_unlock; + } + error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), asoc->state, asoc->ep, asoc, @@ -507,7 +516,7 @@ static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands, 0); /* Update the hb timer to resend a heartbeat every rto */ - sctp_cmd_hb_timer_update(commands, transport); + sctp_transport_reset_hb_timer(transport); } if (transport->state != SCTP_INACTIVE && @@ -634,11 +643,8 @@ static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, * hold a reference on the transport to make sure none of * the needed data structures go away. */ - list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { - - if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) - sctp_transport_hold(t); - } + list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) + sctp_transport_reset_hb_timer(t); } static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, @@ -669,15 +675,6 @@ static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, } -/* Helper function to update the heartbeat timer. */ -static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, - struct sctp_transport *t) -{ - /* Update the heartbeat timer. */ - if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) - sctp_transport_hold(t); -} - /* Helper function to handle the reception of an HEARTBEAT ACK. */ static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, struct sctp_association *asoc, @@ -742,8 +739,7 @@ static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); /* Update the heartbeat timer. */ - if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) - sctp_transport_hold(t); + sctp_transport_reset_hb_timer(t); if (was_unconfirmed && asoc->peer.transport_count == 1) sctp_transport_immediate_rtx(t); @@ -1614,7 +1610,7 @@ static int sctp_cmd_interpreter(sctp_event_t event_type, case SCTP_CMD_HB_TIMER_UPDATE: t = cmd->obj.transport; - sctp_cmd_hb_timer_update(commands, t); + sctp_transport_reset_hb_timer(t); break; case SCTP_CMD_HB_TIMERS_STOP: diff --git a/net/sctp/transport.c b/net/sctp/transport.c index 9b6b48c7524e..81b86678be4d 100644 --- a/net/sctp/transport.c +++ b/net/sctp/transport.c @@ -183,7 +183,7 @@ static void sctp_transport_destroy(struct sctp_transport *transport) /* Start T3_rtx timer if it is not already running and update the heartbeat * timer. This routine is called every time a DATA chunk is sent. */ -void sctp_transport_reset_timers(struct sctp_transport *transport) +void sctp_transport_reset_t3_rtx(struct sctp_transport *transport) { /* RFC 2960 6.3.2 Retransmission Timer Rules * @@ -197,11 +197,18 @@ void sctp_transport_reset_timers(struct sctp_transport *transport) if (!mod_timer(&transport->T3_rtx_timer, jiffies + transport->rto)) sctp_transport_hold(transport); +} + +void sctp_transport_reset_hb_timer(struct sctp_transport *transport) +{ + unsigned long expires; /* When a data chunk is sent, reset the heartbeat interval. */ - if (!mod_timer(&transport->hb_timer, - sctp_transport_timeout(transport))) - sctp_transport_hold(transport); + expires = jiffies + sctp_transport_timeout(transport); + if (time_before(transport->hb_timer.expires, expires) && + !mod_timer(&transport->hb_timer, + expires + prandom_u32_max(transport->rto))) + sctp_transport_hold(transport); } /* This transport has been assigned to an association. @@ -595,13 +602,13 @@ void sctp_transport_burst_reset(struct sctp_transport *t) unsigned long sctp_transport_timeout(struct sctp_transport *trans) { /* RTO + timer slack +/- 50% of RTO */ - unsigned long timeout = (trans->rto >> 1) + prandom_u32_max(trans->rto); + unsigned long timeout = trans->rto >> 1; if (trans->state != SCTP_UNCONFIRMED && trans->state != SCTP_PF) timeout += trans->hbinterval; - return timeout + jiffies; + return timeout; } /* Reset transport variables to their initial values */