Description: remove CBQ functionality
Author: Tianon Gravi <tianon@debian.org>
Origin: https://bugs.busybox.net/attachment.cgi?id=9751&action=edit

See:
- https://github.com/docker-library/busybox/issues/198
- https://bugs.busybox.net/show_bug.cgi?id=15931
- https://bugs.debian.org/1071648

See also:
- https://github.com/torvalds/linux/commit/33241dca486264193ed68167c8eeae1fb197f3df
- https://github.com/iproute2/iproute2/commit/07ba0af3fee132eddc1c2eab643ff4910181c993

diff --git a/networking/tc.c b/networking/tc.c
index 3a79fd2d9..753efb9ff 100644
--- a/networking/tc.c
+++ b/networking/tc.c
@@ -31,7 +31,7 @@
 //usage:	"qdisc [handle QHANDLE] [root|"IF_FEATURE_TC_INGRESS("ingress|")"parent CLASSID]\n"
 /* //usage: "[estimator INTERVAL TIME_CONSTANT]\n" */
 //usage:	"	[[QDISC_KIND] [help|OPTIONS]]\n"
-//usage:	"	QDISC_KIND := [p|b]fifo|tbf|prio|cbq|red|etc.\n"
+//usage:	"	QDISC_KIND := [p|b]fifo|tbf|prio|red|etc.\n"
 //usage:	"qdisc show [dev STRING]"IF_FEATURE_TC_INGRESS(" [ingress]")"\n"
 //usage:	"class [classid CLASSID] [root|parent CLASSID]\n"
 //usage:	"	[[QDISC_KIND] [help|OPTIONS] ]\n"
@@ -224,105 +224,6 @@ static int prio_print_opt(struct rtattr *opt)
 	return 0;
 }
 
-#if 0
-/* Class Based Queue */
-static int cbq_parse_opt(int argc, char **argv, struct nlmsghdr *n)
-{
-	return 0;
-}
-#endif
-static int cbq_print_opt(struct rtattr *opt)
-{
-	struct rtattr *tb[TCA_CBQ_MAX+1];
-	struct tc_ratespec *r = NULL;
-	struct tc_cbq_lssopt *lss = NULL;
-	struct tc_cbq_wrropt *wrr = NULL;
-	struct tc_cbq_fopt *fopt = NULL;
-	struct tc_cbq_ovl *ovl = NULL;
-	const char *const error = "CBQ: too short %s opt";
-	char buf[64];
-
-	if (opt == NULL)
-		goto done;
-	parse_rtattr_nested(tb, TCA_CBQ_MAX, opt);
-
-	if (tb[TCA_CBQ_RATE]) {
-		if (RTA_PAYLOAD(tb[TCA_CBQ_RATE]) < sizeof(*r))
-			bb_error_msg(error, "rate");
-		else
-			r = RTA_DATA(tb[TCA_CBQ_RATE]);
-	}
-	if (tb[TCA_CBQ_LSSOPT]) {
-		if (RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT]) < sizeof(*lss))
-			bb_error_msg(error, "lss");
-		else
-			lss = RTA_DATA(tb[TCA_CBQ_LSSOPT]);
-	}
-	if (tb[TCA_CBQ_WRROPT]) {
-		if (RTA_PAYLOAD(tb[TCA_CBQ_WRROPT]) < sizeof(*wrr))
-			bb_error_msg(error, "wrr");
-		else
-			wrr = RTA_DATA(tb[TCA_CBQ_WRROPT]);
-	}
-	if (tb[TCA_CBQ_FOPT]) {
-		if (RTA_PAYLOAD(tb[TCA_CBQ_FOPT]) < sizeof(*fopt))
-			bb_error_msg(error, "fopt");
-		else
-			fopt = RTA_DATA(tb[TCA_CBQ_FOPT]);
-	}
-	if (tb[TCA_CBQ_OVL_STRATEGY]) {
-		if (RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]) < sizeof(*ovl))
-			bb_error_msg("CBQ: too short overlimit strategy %u/%u",
-				(unsigned) RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]),
-				(unsigned) sizeof(*ovl));
-		else
-			ovl = RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY]);
-	}
-
-	if (r) {
-		print_rate(buf, sizeof(buf), r->rate);
-		printf("rate %s ", buf);
-		if (show_details) {
-			printf("cell %ub ", 1<<r->cell_log);
-			if (r->mpu)
-				printf("mpu %ub ", r->mpu);
-			if (r->overhead)
-				printf("overhead %ub ", r->overhead);
-		}
-	}
-	if (lss && lss->flags) {
-		bool comma = false;
-		bb_putchar('(');
-		if (lss->flags&TCF_CBQ_LSS_BOUNDED) {
-			printf("bounded");
-			comma = true;
-		}
-		if (lss->flags&TCF_CBQ_LSS_ISOLATED) {
-			if (comma)
-				bb_putchar(',');
-			printf("isolated");
-		}
-		printf(") ");
-	}
-	if (wrr) {
-		if (wrr->priority != TC_CBQ_MAXPRIO)
-			printf("prio %u", wrr->priority);
-		else
-			printf("prio no-transmit");
-		if (show_details) {
-			printf("/%u ", wrr->cpriority);
-			if (wrr->weight != 1) {
-				print_rate(buf, sizeof(buf), wrr->weight);
-				printf("weight %s ", buf);
-			}
-			if (wrr->allot)
-				printf("allot %ub ", wrr->allot);
-		}
-	}
- done:
-	return 0;
-}
-
 static FAST_FUNC int print_qdisc(
 		const struct sockaddr_nl *who UNUSED_PARAM,
 		struct nlmsghdr *hdr,
@@ -368,12 +269,10 @@ static FAST_FUNC int print_qdisc(
 	if (msg->tcm_info != 1)
 		printf("refcnt %d ", msg->tcm_info);
 	if (tb[TCA_OPTIONS]) {
-		static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
+		static const char _q_[] ALIGN1 = "pfifo_fast\0";
 		int qqq = index_in_strings(_q_, name);
 		if (qqq == 0) { /* pfifo_fast aka prio */
 			prio_print_opt(tb[TCA_OPTIONS]);
-		} else if (qqq == 1) { /* class based queuing */
-			cbq_print_opt(tb[TCA_OPTIONS]);
 		} else {
 			/* don't know how to print options for this qdisc */
 			printf("(options for %s)", name);
@@ -438,13 +337,10 @@ static FAST_FUNC int print_class(
 		printf("leaf %x ", msg->tcm_info >> 16);
 	/* Do that get_qdisc_kind(RTA_DATA(tb[TCA_KIND])).  */
 	if (tb[TCA_OPTIONS]) {
-		static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
+		static const char _q_[] ALIGN1 = "pfifo_fast\0";
 		int qqq = index_in_strings(_q_, name);
 		if (qqq == 0) { /* pfifo_fast aka prio */
 			/* nothing. */ /*prio_print_opt(tb[TCA_OPTIONS]);*/
-		} else if (qqq == 1) { /* class based queuing */
-			/* cbq_print_copt() is identical to cbq_print_opt(). */
-			cbq_print_opt(tb[TCA_OPTIONS]);
 		} else {
 			/* don't know how to print options for this class */
 			printf("(options for %s)", name);