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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/net/sctp/sm_statefuns.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 is part of the SCTP Linux Kernel Implementation.
910  *
1011  * These are the state functions for the state machine.
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):
....@@ -163,6 +148,12 @@
163148 					const union sctp_subtype type,
164149 					void *arg,
165150 					struct sctp_cmd_seq *commands);
151
+
152
+static enum sctp_disposition
153
+__sctp_sf_do_9_2_reshutack(struct net *net, const struct sctp_endpoint *ep,
154
+			   const struct sctp_association *asoc,
155
+			   const union sctp_subtype type, void *arg,
156
+			   struct sctp_cmd_seq *commands);
166157 
167158 /* Small helper function that checks if the chunk length
168159  * is of the appropriate length.  The 'required_length' argument
....@@ -345,6 +336,14 @@
345336 	if (!chunk->singleton)
346337 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
347338 
339
+	/* Make sure that the INIT chunk has a valid length.
340
+	 * Normally, this would cause an ABORT with a Protocol Violation
341
+	 * error, but since we don't have an association, we'll
342
+	 * just discard the packet.
343
+	 */
344
+	if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk)))
345
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
346
+
348347 	/* If the packet is an OOTB packet which is temporarily on the
349348 	 * control endpoint, respond with an ABORT.
350349 	 */
....@@ -358,14 +357,6 @@
358357 	 */
359358 	if (chunk->sctp_hdr->vtag != 0)
360359 		return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands);
361
-
362
-	/* Make sure that the INIT chunk has a valid length.
363
-	 * Normally, this would cause an ABORT with a Protocol Violation
364
-	 * error, but since we don't have an association, we'll
365
-	 * just discard the packet.
366
-	 */
367
-	if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk)))
368
-		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
369360 
370361 	/* If the INIT is coming toward a closing socket, we'll send back
371362 	 * and ABORT.  Essentially, this catches the race of INIT being
....@@ -1349,7 +1340,7 @@
13491340 				       struct sctp_chunk *init,
13501341 				       struct sctp_cmd_seq *commands)
13511342 {
1352
-	struct net *net = sock_net(new_asoc->base.sk);
1343
+	struct net *net = new_asoc->base.net;
13531344 	struct sctp_transport *new_addr;
13541345 	int ret = 1;
13551346 
....@@ -1499,19 +1490,16 @@
14991490 	if (!chunk->singleton)
15001491 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
15011492 
1493
+	/* Make sure that the INIT chunk has a valid length. */
1494
+	if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk)))
1495
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
1496
+
15021497 	/* 3.1 A packet containing an INIT chunk MUST have a zero Verification
15031498 	 * Tag.
15041499 	 */
15051500 	if (chunk->sctp_hdr->vtag != 0)
15061501 		return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands);
15071502 
1508
-	/* Make sure that the INIT chunk has a valid length.
1509
-	 * In this case, we generate a protocol violation since we have
1510
-	 * an association established.
1511
-	 */
1512
-	if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk)))
1513
-		return sctp_sf_violation_chunklen(net, ep, asoc, type, arg,
1514
-						  commands);
15151503 	/* Grab the INIT header.  */
15161504 	chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data;
15171505 
....@@ -1829,9 +1817,9 @@
18291817 	 * its peer.
18301818 	*/
18311819 	if (sctp_state(asoc, SHUTDOWN_ACK_SENT)) {
1832
-		disposition = sctp_sf_do_9_2_reshutack(net, ep, asoc,
1833
-				SCTP_ST_CHUNK(chunk->chunk_hdr->type),
1834
-				chunk, commands);
1820
+		disposition = __sctp_sf_do_9_2_reshutack(net, ep, asoc,
1821
+							 SCTP_ST_CHUNK(chunk->chunk_hdr->type),
1822
+							 chunk, commands);
18351823 		if (SCTP_DISPOSITION_NOMEM == disposition)
18361824 			goto nomem;
18371825 
....@@ -2301,7 +2289,7 @@
23012289 	 */
23022290 	if (SCTP_ADDR_DEL ==
23032291 		    sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest))
2304
-		return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands);
2292
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
23052293 
23062294 	if (!sctp_err_chunk_valid(chunk))
23072295 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
....@@ -2347,7 +2335,7 @@
23472335 	 */
23482336 	if (SCTP_ADDR_DEL ==
23492337 		    sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest))
2350
-		return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands);
2338
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
23512339 
23522340 	if (!sctp_err_chunk_valid(chunk))
23532341 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
....@@ -2617,7 +2605,7 @@
26172605 	 */
26182606 	if (SCTP_ADDR_DEL ==
26192607 		    sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest))
2620
-		return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands);
2608
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
26212609 
26222610 	if (!sctp_err_chunk_valid(chunk))
26232611 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
....@@ -2930,13 +2918,11 @@
29302918  * that belong to this association, it should discard the INIT chunk and
29312919  * retransmit the SHUTDOWN ACK chunk.
29322920  */
2933
-enum sctp_disposition sctp_sf_do_9_2_reshutack(
2934
-					struct net *net,
2935
-					const struct sctp_endpoint *ep,
2936
-					const struct sctp_association *asoc,
2937
-					const union sctp_subtype type,
2938
-					void *arg,
2939
-					struct sctp_cmd_seq *commands)
2921
+static enum sctp_disposition
2922
+__sctp_sf_do_9_2_reshutack(struct net *net, const struct sctp_endpoint *ep,
2923
+			   const struct sctp_association *asoc,
2924
+			   const union sctp_subtype type, void *arg,
2925
+			   struct sctp_cmd_seq *commands)
29402926 {
29412927 	struct sctp_chunk *chunk = arg;
29422928 	struct sctp_chunk *reply;
....@@ -2968,6 +2954,26 @@
29682954 	return SCTP_DISPOSITION_CONSUME;
29692955 nomem:
29702956 	return SCTP_DISPOSITION_NOMEM;
2957
+}
2958
+
2959
+enum sctp_disposition
2960
+sctp_sf_do_9_2_reshutack(struct net *net, const struct sctp_endpoint *ep,
2961
+			 const struct sctp_association *asoc,
2962
+			 const union sctp_subtype type, void *arg,
2963
+			 struct sctp_cmd_seq *commands)
2964
+{
2965
+	struct sctp_chunk *chunk = arg;
2966
+
2967
+	if (!chunk->singleton)
2968
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
2969
+
2970
+	if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk)))
2971
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
2972
+
2973
+	if (chunk->sctp_hdr->vtag != 0)
2974
+		return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands);
2975
+
2976
+	return __sctp_sf_do_9_2_reshutack(net, ep, asoc, type, arg, commands);
29712977 }
29722978 
29732979 /*
....@@ -3330,8 +3336,6 @@
33303336 	struct sctp_sackhdr *sackh;
33313337 	__u32 ctsn;
33323338 
3333
-	trace_sctp_probe(ep, asoc, chunk);
3334
-
33353339 	if (!sctp_vtag_verify(chunk, asoc))
33363340 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
33373341 
....@@ -3348,6 +3352,15 @@
33483352 	chunk->subh.sack_hdr = sackh;
33493353 	ctsn = ntohl(sackh->cum_tsn_ack);
33503354 
3355
+	/* If Cumulative TSN Ack beyond the max tsn currently
3356
+	 * send, terminating the association and respond to the
3357
+	 * sender with an ABORT.
3358
+	 */
3359
+	if (TSN_lte(asoc->next_tsn, ctsn))
3360
+		return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands);
3361
+
3362
+	trace_sctp_probe(ep, asoc, chunk);
3363
+
33513364 	/* i) If Cumulative TSN Ack is less than the Cumulative TSN
33523365 	 *     Ack Point, then drop the SACK.  Since Cumulative TSN
33533366 	 *     Ack is monotonically increasing, a SACK whose
....@@ -3360,13 +3373,6 @@
33603373 
33613374 		return SCTP_DISPOSITION_DISCARD;
33623375 	}
3363
-
3364
-	/* If Cumulative TSN Ack beyond the max tsn currently
3365
-	 * send, terminating the association and respond to the
3366
-	 * sender with an ABORT.
3367
-	 */
3368
-	if (!TSN_lt(ctsn, asoc->next_tsn))
3369
-		return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands);
33703376 
33713377 	/* Return this SACK for further processing.  */
33723378 	sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk));
....@@ -3766,20 +3772,20 @@
37663772 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
37673773 	}
37683774 
3775
+	/* Make sure that the ASCONF ADDIP chunk has a valid length.  */
3776
+	if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_addip_chunk)))
3777
+		return sctp_sf_violation_chunklen(net, ep, asoc, type, arg,
3778
+						  commands);
3779
+
37693780 	/* ADD-IP: Section 4.1.1
37703781 	 * This chunk MUST be sent in an authenticated way by using
37713782 	 * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk
37723783 	 * is received unauthenticated it MUST be silently discarded as
37733784 	 * described in [I-D.ietf-tsvwg-sctp-auth].
37743785 	 */
3775
-	if (!net->sctp.addip_noauth && !chunk->auth)
3776
-		return sctp_sf_discard_chunk(net, ep, asoc, type, arg,
3777
-					     commands);
3778
-
3779
-	/* Make sure that the ASCONF ADDIP chunk has a valid length.  */
3780
-	if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_addip_chunk)))
3781
-		return sctp_sf_violation_chunklen(net, ep, asoc, type, arg,
3782
-						  commands);
3786
+	if (!asoc->peer.asconf_capable ||
3787
+	    (!net->sctp.addip_noauth && !chunk->auth))
3788
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
37833789 
37843790 	hdr = (struct sctp_addiphdr *)chunk->skb->data;
37853791 	serial = ntohl(hdr->serial);
....@@ -3908,21 +3914,21 @@
39083914 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
39093915 	}
39103916 
3917
+	/* Make sure that the ADDIP chunk has a valid length.  */
3918
+	if (!sctp_chunk_length_valid(asconf_ack,
3919
+				     sizeof(struct sctp_addip_chunk)))
3920
+		return sctp_sf_violation_chunklen(net, ep, asoc, type, arg,
3921
+						  commands);
3922
+
39113923 	/* ADD-IP, Section 4.1.2:
39123924 	 * This chunk MUST be sent in an authenticated way by using
39133925 	 * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk
39143926 	 * is received unauthenticated it MUST be silently discarded as
39153927 	 * described in [I-D.ietf-tsvwg-sctp-auth].
39163928 	 */
3917
-	if (!net->sctp.addip_noauth && !asconf_ack->auth)
3918
-		return sctp_sf_discard_chunk(net, ep, asoc, type, arg,
3919
-					     commands);
3920
-
3921
-	/* Make sure that the ADDIP chunk has a valid length.  */
3922
-	if (!sctp_chunk_length_valid(asconf_ack,
3923
-				     sizeof(struct sctp_addip_chunk)))
3924
-		return sctp_sf_violation_chunklen(net, ep, asoc, type, arg,
3925
-						  commands);
3929
+	if (!asoc->peer.asconf_capable ||
3930
+	    (!net->sctp.addip_noauth && !asconf_ack->auth))
3931
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
39263932 
39273933 	addip_hdr = (struct sctp_addiphdr *)asconf_ack->skb->data;
39283934 	rcvd_serial = ntohl(addip_hdr->serial);
....@@ -4350,7 +4356,7 @@
43504356 			sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
43514357 					SCTP_CHUNK(err_chunk));
43524358 		}
4353
-		/* Fall Through */
4359
+		fallthrough;
43544360 	case SCTP_IERROR_AUTH_BAD_KEYID:
43554361 	case SCTP_IERROR_BAD_SIG:
43564362 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
....@@ -4493,6 +4499,9 @@
44934499 					    struct sctp_cmd_seq *commands)
44944500 {
44954501 	struct sctp_chunk *chunk = arg;
4502
+
4503
+	if (asoc && !sctp_vtag_verify(chunk, asoc))
4504
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
44964505 
44974506 	/* Make sure that the chunk has a valid length.
44984507 	 * Since we don't know the chunk type, we use a general
....@@ -6471,13 +6480,15 @@
64716480 	 * in sctp_ulpevent_make_rcvmsg will drop the frame if we grow our
64726481 	 * memory usage too much
64736482 	 */
6474
-	if (*sk->sk_prot_creator->memory_pressure) {
6483
+	if (sk_under_memory_pressure(sk)) {
64756484 		if (sctp_tsnmap_has_gap(map) &&
64766485 		    (sctp_tsnmap_get_ctsn(map) + 1) == tsn) {
64776486 			pr_debug("%s: under pressure, reneging for tsn:%u\n",
64786487 				 __func__, tsn);
64796488 			deliver = SCTP_CMD_RENEGE;
6480
-		 }
6489
+		} else {
6490
+			sk_mem_reclaim(sk);
6491
+		}
64816492 	}
64826493 
64836494 	/*