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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/net/sched/cls_tcindex.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
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3
  * net/sched/cls_tcindex.c	Packet classifier for skb->tc_index
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4
  *
..
..
@@ -10,6 +11,7 @@
10
11
 #include <linux/skbuff.h>
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12
 #include <linux/errno.h>
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13
 #include <linux/slab.h>
14
+#include <linux/refcount.h>
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15
 #include <net/act_api.h>
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16
 #include <net/netlink.h>
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17
 #include <net/pkt_cls.h>
..
..
@@ -25,9 +27,12 @@
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27
 #define DEFAULT_HASH_SIZE	64	/* optimized for diffserv */
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28
 
27
29
 
30
+struct tcindex_data;
31
+
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32
 struct tcindex_filter_result {
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33
 	struct tcf_exts		exts;
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34
 	struct tcf_result	res;
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+	struct tcindex_data	*p;
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36
 	struct rcu_work		rwork;
32
37
 };
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38
 
..
..
@@ -48,12 +53,27 @@
48
53
 	u32 hash;		/* hash table size; 0 if undefined */
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54
 	u32 alloc_hash;		/* allocated size */
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55
 	u32 fall_through;	/* 0: only classify if explicit match */
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+	refcount_t refcnt;	/* a temporary refcnt for perfect hash */
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 	struct rcu_work rwork;
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58
 };
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59
 
54
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 static inline int tcindex_filter_is_set(struct tcindex_filter_result *r)
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61
 {
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62
 	return tcf_exts_has_actions(&r->exts) || r->res.classid;
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+}
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+
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+static void tcindex_data_get(struct tcindex_data *p)
66
+{
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+	refcount_inc(&p->refcnt);
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+}
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+
70
+static void tcindex_data_put(struct tcindex_data *p)
71
+{
72
+	if (refcount_dec_and_test(&p->refcnt)) {
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+		kfree(p->perfect);
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+		kfree(p->h);
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+		kfree(p);
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+	}
57
77
 }
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78
 
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 static struct tcindex_filter_result *tcindex_lookup(struct tcindex_data *p,
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..
@@ -131,6 +151,7 @@
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 	p->mask = 0xffff;
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152
 	p->hash = DEFAULT_HASH_SIZE;
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153
 	p->fall_through = 1;
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+	refcount_set(&p->refcnt, 1); /* Paired with tcindex_destroy_work() */
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155
 
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 	rcu_assign_pointer(tp->root, p);
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157
 	return 0;
..
..
@@ -140,6 +161,7 @@
140
161
 {
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 	tcf_exts_destroy(&r->exts);
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 	tcf_exts_put_net(&r->exts);
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+	tcindex_data_put(r->p);
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165
 }
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166
 
145
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 static void tcindex_destroy_rexts_work(struct work_struct *work)
..
..
@@ -173,7 +195,7 @@
173
195
 }
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196
 
175
197
 static int tcindex_delete(struct tcf_proto *tp, void *arg, bool *last,
176
-			  struct netlink_ext_ack *extack)
198
+			  bool rtnl_held, struct netlink_ext_ack *extack)
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199
 {
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 	struct tcindex_data *p = rtnl_dereference(tp->root);
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 	struct tcindex_filter_result *r = arg;
..
..
@@ -211,6 +233,8 @@
211
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 		else
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 			__tcindex_destroy_fexts(f);
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 	} else {
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+		tcindex_data_get(p);
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+
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 		if (tcf_exts_get_net(&r->exts))
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 			tcf_queue_work(&r->rwork, tcindex_destroy_rexts_work);
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 		else
..
..
@@ -227,9 +251,7 @@
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 					      struct tcindex_data,
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252
 					      rwork);
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253
 
230
-	kfree(p->perfect);
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-	kfree(p->h);
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-	kfree(p);
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+	tcindex_data_put(p);
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255
 }
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256
 
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 static inline int
..
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@@ -246,11 +268,17 @@
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268
 	[TCA_TCINDEX_CLASSID]		= { .type = NLA_U32 },
247
269
 };
248
270
 
249
-static int tcindex_filter_result_init(struct tcindex_filter_result *r)
271
+static int tcindex_filter_result_init(struct tcindex_filter_result *r,
272
+				      struct tcindex_data *p,
273
+				      struct net *net)
250
274
 {
251
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 	memset(r, 0, sizeof(*r));
252
-	return tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
276
+	r->p = p;
277
+	return tcf_exts_init(&r->exts, net, TCA_TCINDEX_ACT,
278
+			     TCA_TCINDEX_POLICE);
253
279
 }
280
+
281
+static void tcindex_free_perfect_hash(struct tcindex_data *cp);
254
282
 
255
283
 static void tcindex_partial_destroy_work(struct work_struct *work)
256
284
 {
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@@ -258,8 +286,11 @@
258
286
 					      struct tcindex_data,
259
287
 					      rwork);
260
288
 
261
-	kfree(p->perfect);
289
+	rtnl_lock();
290
+	if (p->perfect)
291
+		tcindex_free_perfect_hash(p);
262
292
 	kfree(p);
293
+	rtnl_unlock();
263
294
 }
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295
 
265
296
 static void tcindex_free_perfect_hash(struct tcindex_data *cp)
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@@ -281,13 +312,11 @@
281
312
 		return -ENOMEM;
282
313
 
283
314
 	for (i = 0; i < cp->hash; i++) {
284
-		err = tcf_exts_init(&cp->perfect[i].exts,
315
+		err = tcf_exts_init(&cp->perfect[i].exts, net,
285
316
 				    TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
286
317
 		if (err < 0)
287
318
 			goto errout;
288
-#ifdef CONFIG_NET_CLS_ACT
289
-		cp->perfect[i].exts.net = net;
290
-#endif
319
+		cp->perfect[i].p = cp;
291
320
 	}
292
321
 
293
322
 	return 0;
..
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@@ -310,10 +339,10 @@
310
339
 	int err, balloc = 0;
311
340
 	struct tcf_exts e;
312
341
 
313
-	err = tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
342
+	err = tcf_exts_init(&e, net, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
314
343
 	if (err < 0)
315
344
 		return err;
316
-	err = tcf_exts_validate(net, tp, tb, est, &e, ovr, extack);
345
+	err = tcf_exts_validate(net, tp, tb, est, &e, ovr, true, extack);
317
346
 	if (err < 0)
318
347
 		goto errout;
319
348
 
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@@ -332,6 +361,7 @@
332
361
 	cp->alloc_hash = p->alloc_hash;
333
362
 	cp->fall_through = p->fall_through;
334
363
 	cp->tp = tp;
364
+	refcount_set(&cp->refcnt, 1); /* Paired with tcindex_destroy_work() */
335
365
 
336
366
 	if (tb[TCA_TCINDEX_HASH])
337
367
 		cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
..
..
@@ -368,7 +398,7 @@
368
398
 	}
369
399
 	cp->h = p->h;
370
400
 
371
-	err = tcindex_filter_result_init(&new_filter_result);
401
+	err = tcindex_filter_result_init(&new_filter_result, cp, net);
372
402
 	if (err < 0)
373
403
 		goto errout_alloc;
374
404
 	if (old_r)
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..
@@ -436,7 +466,7 @@
436
466
 			goto errout_alloc;
437
467
 		f->key = handle;
438
468
 		f->next = NULL;
439
-		err = tcindex_filter_result_init(&f->result);
469
+		err = tcindex_filter_result_init(&f->result, cp, net);
440
470
 		if (err < 0) {
441
471
 			kfree(f);
442
472
 			goto errout_alloc;
..
..
@@ -449,7 +479,7 @@
449
479
 	}
450
480
 
451
481
 	if (old_r && old_r != r) {
452
-		err = tcindex_filter_result_init(old_r);
482
+		err = tcindex_filter_result_init(old_r, cp, net);
453
483
 		if (err < 0) {
454
484
 			kfree(f);
455
485
 			goto errout_alloc;
..
..
@@ -500,7 +530,7 @@
500
530
 tcindex_change(struct net *net, struct sk_buff *in_skb,
501
531
 	       struct tcf_proto *tp, unsigned long base, u32 handle,
502
532
 	       struct nlattr **tca, void **arg, bool ovr,
503
-	       struct netlink_ext_ack *extack)
533
+	       bool rtnl_held, struct netlink_ext_ack *extack)
504
534
 {
505
535
 	struct nlattr *opt = tca[TCA_OPTIONS];
506
536
 	struct nlattr *tb[TCA_TCINDEX_MAX + 1];
..
..
@@ -510,12 +540,13 @@
510
540
 
511
541
 	pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
512
542
 	    "p %p,r %p,*arg %p\n",
513
-	    tp, handle, tca, arg, opt, p, r, arg ? *arg : NULL);
543
+	    tp, handle, tca, arg, opt, p, r, *arg);
514
544
 
515
545
 	if (!opt)
516
546
 		return 0;
517
547
 
518
-	err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy, NULL);
548
+	err = nla_parse_nested_deprecated(tb, TCA_TCINDEX_MAX, opt,
549
+					  tcindex_policy, NULL);
519
550
 	if (err < 0)
520
551
 		return err;
521
552
 
..
..
@@ -523,7 +554,8 @@
523
554
 				 tca[TCA_RATE], ovr, extack);
524
555
 }
525
556
 
526
-static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
557
+static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker,
558
+			 bool rtnl_held)
527
559
 {
528
560
 	struct tcindex_data *p = rtnl_dereference(tp->root);
529
561
 	struct tcindex_filter *f, *next;
..
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@@ -559,7 +591,7 @@
559
591
 	}
560
592
 }
561
593
 
562
-static void tcindex_destroy(struct tcf_proto *tp,
594
+static void tcindex_destroy(struct tcf_proto *tp, bool rtnl_held,
563
595
 			    struct netlink_ext_ack *extack)
564
596
 {
565
597
 	struct tcindex_data *p = rtnl_dereference(tp->root);
..
..
@@ -570,6 +602,14 @@
570
602
 	if (p->perfect) {
571
603
 		for (i = 0; i < p->hash; i++) {
572
604
 			struct tcindex_filter_result *r = p->perfect + i;
605
+
606
+			/* tcf_queue_work() does not guarantee the ordering we
607
+			 * want, so we have to take this refcnt temporarily to
608
+			 * ensure 'p' is freed after all tcindex_filter_result
609
+			 * here. Imperfect hash does not need this, because it
610
+			 * uses linked lists rather than an array.
611
+			 */
612
+			tcindex_data_get(p);
573
613
 
574
614
 			tcf_unbind_filter(tp, &r->res);
575
615
 			if (tcf_exts_get_net(&r->exts))
..
..
@@ -586,7 +626,7 @@
586
626
 
587
627
 		for (f = rtnl_dereference(p->h[i]); f; f = next) {
588
628
 			next = rtnl_dereference(f->next);
589
-			tcindex_delete(tp, &f->result, &last, NULL);
629
+			tcindex_delete(tp, &f->result, &last, rtnl_held, NULL);
590
630
 		}
591
631
 	}
592
632
 
..
..
@@ -595,7 +635,7 @@
595
635
 
596
636
 
597
637
 static int tcindex_dump(struct net *net, struct tcf_proto *tp, void *fh,
598
-			struct sk_buff *skb, struct tcmsg *t)
638
+			struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
599
639
 {
600
640
 	struct tcindex_data *p = rtnl_dereference(tp->root);
601
641
 	struct tcindex_filter_result *r = fh;
..
..
@@ -605,7 +645,7 @@
605
645
 		 tp, fh, skb, t, p, r);
606
646
 	pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h);
607
647
 
608
-	nest = nla_nest_start(skb, TCA_OPTIONS);
648
+	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
609
649
 	if (nest == NULL)
610
650
 		goto nla_put_failure;
611
651