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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/net/sctp/associola.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /* SCTP kernel implementation
23  * (C) Copyright IBM Corp. 2001, 2004
34  * Copyright (c) 1999-2000 Cisco, Inc.
....@@ -8,22 +9,6 @@
89  * This file is part of the SCTP kernel implementation
910  *
1011  * This module provides the abstraction for an SCTP association.
11
- *
12
- * This SCTP implementation is free software;
13
- * you can redistribute it and/or modify it under the terms of
14
- * the GNU General Public License as published by
15
- * the Free Software Foundation; either version 2, or (at your option)
16
- * any later version.
17
- *
18
- * This SCTP implementation is distributed in the hope that it
19
- * will be useful, but WITHOUT ANY WARRANTY; without even the implied
20
- *                 ************************
21
- * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22
- * See the GNU General Public License for more details.
23
- *
24
- * You should have received a copy of the GNU General Public License
25
- * along with GNU CC; see the file COPYING.  If not, see
26
- * <http://www.gnu.org/licenses/>.
2712  *
2813  * Please send any bug reports or fixes you make to the
2914  * email address(es):
....@@ -69,7 +54,6 @@
6954 					const struct sock *sk,
7055 					enum sctp_scope scope, gfp_t gfp)
7156 {
72
-	struct net *net = sock_net(sk);
7357 	struct sctp_sock *sp;
7458 	struct sctp_paramhdr *p;
7559 	int i;
....@@ -102,7 +86,9 @@
10286 	 * socket values.
10387 	 */
10488 	asoc->max_retrans = sp->assocparams.sasoc_asocmaxrxt;
105
-	asoc->pf_retrans  = net->sctp.pf_retrans;
89
+	asoc->pf_retrans  = sp->pf_retrans;
90
+	asoc->ps_retrans  = sp->ps_retrans;
91
+	asoc->pf_expose   = sp->pf_expose;
10692 
10793 	asoc->rto_initial = msecs_to_jiffies(sp->rtoinfo.srto_initial);
10894 	asoc->rto_max = msecs_to_jiffies(sp->rtoinfo.srto_max);
....@@ -132,6 +118,8 @@
132118 	 * in a burst.
133119 	 */
134120 	asoc->max_burst = sp->max_burst;
121
+
122
+	asoc->subscribe = sp->subscribe;
135123 
136124 	/* initialize association timers */
137125 	asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = asoc->rto_initial;
....@@ -228,14 +216,6 @@
228216 	asoc->peer.sack_needed = 1;
229217 	asoc->peer.sack_generation = 1;
230218 
231
-	/* Assume that the peer will tell us if he recognizes ASCONF
232
-	 * as part of INIT exchange.
233
-	 * The sctp_addip_noauth option is there for backward compatibility
234
-	 * and will revert old behavior.
235
-	 */
236
-	if (net->sctp.addip_noauth)
237
-		asoc->peer.asconf_capable = 1;
238
-
239219 	/* Create an input queue.  */
240220 	sctp_inq_init(&asoc->base.inqueue);
241221 	sctp_inq_set_th_handler(&asoc->base.inqueue, sctp_assoc_bh_rcv);
....@@ -246,9 +226,8 @@
246226 	if (!sctp_ulpq_init(&asoc->ulpq, asoc))
247227 		goto fail_init;
248228 
249
-	if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams,
250
-			     0, gfp))
251
-		goto fail_init;
229
+	if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, 0, gfp))
230
+		goto stream_free;
252231 
253232 	/* Initialize default path MTU. */
254233 	asoc->pathmtu = sp->pathmtu;
....@@ -275,8 +254,6 @@
275254 		goto stream_free;
276255 
277256 	asoc->active_key_id = ep->active_key_id;
278
-	asoc->prsctp_enable = ep->prsctp_enable;
279
-	asoc->reconf_enable = ep->reconf_enable;
280257 	asoc->strreset_enable = ep->strreset_enable;
281258 
282259 	/* Save the hmacs and chunks list into this association */
....@@ -349,7 +326,7 @@
349326 		 * socket.
350327 		 */
351328 		if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
352
-			sk->sk_ack_backlog--;
329
+			sk_acceptq_removed(sk);
353330 	}
354331 
355332 	/* Mark as dead, so other users can know this structure is
....@@ -454,6 +431,8 @@
454431 		changeover = 1 ;
455432 
456433 	asoc->peer.primary_path = transport;
434
+	sctp_ulpevent_notify_peer_addr_change(transport,
435
+					      SCTP_ADDR_MADE_PRIM, 0);
457436 
458437 	/* Set a default msg_name for events. */
459438 	memcpy(&asoc->peer.primary_addr, &transport->ipaddr,
....@@ -594,6 +573,7 @@
594573 
595574 	asoc->peer.transport_count--;
596575 
576
+	sctp_ulpevent_notify_peer_addr_change(peer, SCTP_ADDR_REMOVED, 0);
597577 	sctp_transport_free(peer);
598578 }
599579 
....@@ -603,7 +583,6 @@
603583 					   const gfp_t gfp,
604584 					   const int peer_state)
605585 {
606
-	struct net *net = sock_net(asoc->base.sk);
607586 	struct sctp_transport *peer;
608587 	struct sctp_sock *sp;
609588 	unsigned short port;
....@@ -633,7 +612,7 @@
633612 		return peer;
634613 	}
635614 
636
-	peer = sctp_transport_new(net, addr, gfp);
615
+	peer = sctp_transport_new(asoc->base.net, addr, gfp);
637616 	if (!peer)
638617 		return NULL;
639618 
....@@ -649,6 +628,8 @@
649628 
650629 	/* And the partial failure retrans threshold */
651630 	peer->pf_retrans = asoc->pf_retrans;
631
+	/* And the primary path switchover retrans threshold */
632
+	peer->ps_retrans = asoc->ps_retrans;
652633 
653634 	/* Initialize the peer's SACK delay timeout based on the
654635 	 * association configured value.
....@@ -732,6 +713,8 @@
732713 	list_add_tail_rcu(&peer->transports, &asoc->peer.transport_addr_list);
733714 	asoc->peer.transport_count++;
734715 
716
+	sctp_ulpevent_notify_peer_addr_change(peer, SCTP_ADDR_ADDED, 0);
717
+
735718 	/* If we do not yet have a primary path, set one.  */
736719 	if (!asoc->peer.primary_path) {
737720 		sctp_assoc_set_primary(asoc, peer);
....@@ -806,9 +789,7 @@
806789 				  enum sctp_transport_cmd command,
807790 				  sctp_sn_error_t error)
808791 {
809
-	struct sctp_ulpevent *event;
810
-	struct sockaddr_storage addr;
811
-	int spc_state = 0;
792
+	int spc_state = SCTP_ADDR_AVAILABLE;
812793 	bool ulp_notify = true;
813794 
814795 	/* Record the transition on the transport.  */
....@@ -818,19 +799,13 @@
818799 		 * to heartbeat success, report the SCTP_ADDR_CONFIRMED
819800 		 * state to the user, otherwise report SCTP_ADDR_AVAILABLE.
820801 		 */
821
-		if (SCTP_UNCONFIRMED == transport->state &&
822
-		    SCTP_HEARTBEAT_SUCCESS == error)
823
-			spc_state = SCTP_ADDR_CONFIRMED;
824
-		else
825
-			spc_state = SCTP_ADDR_AVAILABLE;
826
-		/* Don't inform ULP about transition from PF to
827
-		 * active state and set cwnd to 1 MTU, see SCTP
828
-		 * Quick failover draft section 5.1, point 5
829
-		 */
830
-		if (transport->state == SCTP_PF) {
802
+		if (transport->state == SCTP_PF &&
803
+		    asoc->pf_expose != SCTP_PF_EXPOSE_ENABLE)
831804 			ulp_notify = false;
832
-			transport->cwnd = asoc->pathmtu;
833
-		}
805
+		else if (transport->state == SCTP_UNCONFIRMED &&
806
+			 error == SCTP_HEARTBEAT_SUCCESS)
807
+			spc_state = SCTP_ADDR_CONFIRMED;
808
+
834809 		transport->state = SCTP_ACTIVE;
835810 		break;
836811 
....@@ -839,19 +814,21 @@
839814 		 * to inactive state.  Also, release the cached route since
840815 		 * there may be a better route next time.
841816 		 */
842
-		if (transport->state != SCTP_UNCONFIRMED)
817
+		if (transport->state != SCTP_UNCONFIRMED) {
843818 			transport->state = SCTP_INACTIVE;
844
-		else {
819
+			spc_state = SCTP_ADDR_UNREACHABLE;
820
+		} else {
845821 			sctp_transport_dst_release(transport);
846822 			ulp_notify = false;
847823 		}
848
-
849
-		spc_state = SCTP_ADDR_UNREACHABLE;
850824 		break;
851825 
852826 	case SCTP_TRANSPORT_PF:
853827 		transport->state = SCTP_PF;
854
-		ulp_notify = false;
828
+		if (asoc->pf_expose != SCTP_PF_EXPOSE_ENABLE)
829
+			ulp_notify = false;
830
+		else
831
+			spc_state = SCTP_ADDR_POTENTIALLY_FAILED;
855832 		break;
856833 
857834 	default:
....@@ -861,16 +838,9 @@
861838 	/* Generate and send a SCTP_PEER_ADDR_CHANGE notification
862839 	 * to the user.
863840 	 */
864
-	if (ulp_notify) {
865
-		memset(&addr, 0, sizeof(struct sockaddr_storage));
866
-		memcpy(&addr, &transport->ipaddr,
867
-		       transport->af_specific->sockaddr_len);
868
-
869
-		event = sctp_ulpevent_make_peer_addr_change(asoc, &addr,
870
-					0, spc_state, error, GFP_ATOMIC);
871
-		if (event)
872
-			asoc->stream.si->enqueue_event(&asoc->ulpq, event);
873
-	}
841
+	if (ulp_notify)
842
+		sctp_ulpevent_notify_peer_addr_change(transport,
843
+						      spc_state, error);
874844 
875845 	/* Select new active and retran paths. */
876846 	sctp_select_active_and_retran_path(asoc);
....@@ -1002,7 +972,7 @@
1002972 	struct sctp_association *asoc =
1003973 		container_of(work, struct sctp_association,
1004974 			     base.inqueue.immediate);
1005
-	struct net *net = sock_net(asoc->base.sk);
975
+	struct net *net = asoc->base.net;
1006976 	union sctp_subtype subtype;
1007977 	struct sctp_endpoint *ep;
1008978 	struct sctp_chunk *chunk;
....@@ -1102,7 +1072,7 @@
11021072 
11031073 	/* Decrement the backlog value for a TCP-style socket. */
11041074 	if (sctp_style(oldsk, TCP))
1105
-		oldsk->sk_ack_backlog--;
1075
+		sk_acceptq_removed(oldsk);
11061076 
11071077 	/* Release references to the old endpoint and the sock.  */
11081078 	sctp_endpoint_put(assoc->ep);
....@@ -1181,8 +1151,7 @@
11811151 		/* Add any peer addresses from the new association. */
11821152 		list_for_each_entry(trans, &new->peer.transport_addr_list,
11831153 				    transports)
1184
-			if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr) &&
1185
-			    !sctp_assoc_add_peer(asoc, &trans->ipaddr,
1154
+			if (!sctp_assoc_add_peer(asoc, &trans->ipaddr,
11861155 						 GFP_ATOMIC, trans->state))
11871156 				return -ENOMEM;
11881157 
....@@ -1380,7 +1349,7 @@
13801349 	}
13811350 
13821351 	/* We did not find anything useful for a possible retransmission
1383
-	 * path; either primary path that we found is the the same as
1352
+	 * path; either primary path that we found is the same as
13841353 	 * the current one, or we didn't generally find an active one.
13851354 	 */
13861355 	if (trans_sec == NULL)
....@@ -1470,7 +1439,8 @@
14701439 /* Should we send a SACK to update our peer? */
14711440 static inline bool sctp_peer_needs_update(struct sctp_association *asoc)
14721441 {
1473
-	struct net *net = sock_net(asoc->base.sk);
1442
+	struct net *net = asoc->base.net;
1443
+
14741444 	switch (asoc->state) {
14751445 	case SCTP_STATE_ESTABLISHED:
14761446 	case SCTP_STATE_SHUTDOWN_PENDING:
....@@ -1565,7 +1535,7 @@
15651535 
15661536 	/* If we've reached or overflowed our receive buffer, announce
15671537 	 * a 0 rwnd if rwnd would still be positive.  Store the
1568
-	 * the potential pressure overflow so that the window can be restored
1538
+	 * potential pressure overflow so that the window can be restored
15691539 	 * back to original value.
15701540 	 */
15711541 	if (rx_count >= asoc->base.sk->sk_rcvbuf)
....@@ -1607,7 +1577,7 @@
16071577 	if (asoc->peer.ipv6_address)
16081578 		flags |= SCTP_ADDR6_PEERSUPP;
16091579 
1610
-	return sctp_bind_addr_copy(sock_net(asoc->base.sk),
1580
+	return sctp_bind_addr_copy(asoc->base.net,
16111581 				   &asoc->base.bind_addr,
16121582 				   &asoc->ep->base.bind_addr,
16131583 				   scope, gfp, flags);
....@@ -1653,8 +1623,11 @@
16531623 	if (preload)
16541624 		idr_preload(gfp);
16551625 	spin_lock_bh(&sctp_assocs_id_lock);
1656
-	/* 0 is not a valid assoc_id, must be >= 1 */
1657
-	ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, 1, 0, GFP_NOWAIT);
1626
+	/* 0, 1, 2 are used as SCTP_FUTURE_ASSOC, SCTP_CURRENT_ASSOC and
1627
+	 * SCTP_ALL_ASSOC, so an available id must be > SCTP_ALL_ASSOC.
1628
+	 */
1629
+	ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, SCTP_ALL_ASSOC + 1, 0,
1630
+			       GFP_NOWAIT);
16581631 	spin_unlock_bh(&sctp_assocs_id_lock);
16591632 	if (preload)
16601633 		idr_preload_end();