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From 2e2ac620670997b59d65a73b0af3e77431be3c18 Mon Sep 17 00:00:00 2001
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From: Andrea Claudi <aclaudi@redhat.com>
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Date: Tue, 18 Jun 2019 20:01:45 +0200
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Subject: [PATCH] tc: introduce tc_qdisc_block_exists helper
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1721291
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Upstream Status: iproute2.git commit d0bcedd549566
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Conflicts: context change due to missing commit 6f7df6b2a1fef
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("tc: Optimize gact action lookup")
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commit d0bcedd549566a87354aa804df3be6be80681ee9
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Author: Jiri Pirko <jiri@mellanox.com>
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Date: Sat Jan 20 11:00:27 2018 +0100
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tc: introduce tc_qdisc_block_exists helper
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This hepler used qdisc dump to list all qdisc and find if block index in
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question is used by any of them. That means the block with specified
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index exists.
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Signed-off-by: Jiri Pirko <jiri@mellanox.com>
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Signed-off-by: David Ahern <dsahern@gmail.com>
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---
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tc/tc_qdisc.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++
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tc/tc_util.h | 2 ++
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2 files changed, 63 insertions(+)
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diff --git a/tc/tc_qdisc.c b/tc/tc_qdisc.c
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index 8b0c5c72dbad1..f8e06ccf205a0 100644
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--- a/tc/tc_qdisc.c
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+++ b/tc/tc_qdisc.c
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@@ -366,3 +366,64 @@ int do_qdisc(int argc, char **argv)
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fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
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return -1;
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}
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+
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+struct tc_qdisc_block_exists_ctx {
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+ __u32 block_index;
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+ bool found;
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+};
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+
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+static int tc_qdisc_block_exists_cb(const struct sockaddr_nl *who,
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+ struct nlmsghdr *n, void *arg)
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+{
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+ struct tc_qdisc_block_exists_ctx *ctx = arg;
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+ struct tcmsg *t = NLMSG_DATA(n);
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+ struct rtattr *tb[TCA_MAX+1];
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+ int len = n->nlmsg_len;
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+
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+ if (n->nlmsg_type != RTM_NEWQDISC)
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+ return 0;
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+
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+ len -= NLMSG_LENGTH(sizeof(*t));
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+ if (len < 0)
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+ return -1;
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+
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+ parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
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+
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+ if (tb[TCA_KIND] == NULL)
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+ return -1;
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+
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+ if (tb[TCA_INGRESS_BLOCK] &&
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+ RTA_PAYLOAD(tb[TCA_INGRESS_BLOCK]) >= sizeof(__u32)) {
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+ __u32 block = rta_getattr_u32(tb[TCA_INGRESS_BLOCK]);
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+
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+ if (block == ctx->block_index)
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+ ctx->found = true;
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+ }
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+
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+ if (tb[TCA_EGRESS_BLOCK] &&
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+ RTA_PAYLOAD(tb[TCA_EGRESS_BLOCK]) >= sizeof(__u32)) {
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+ __u32 block = rta_getattr_u32(tb[TCA_EGRESS_BLOCK]);
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+
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+ if (block == ctx->block_index)
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+ ctx->found = true;
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+ }
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+ return 0;
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+}
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+
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+bool tc_qdisc_block_exists(__u32 block_index)
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+{
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+ struct tc_qdisc_block_exists_ctx ctx = { .block_index = block_index };
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+ struct tcmsg t = { .tcm_family = AF_UNSPEC };
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+
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+ if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
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+ perror("Cannot send dump request");
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+ return false;
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+ }
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+
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+ if (rtnl_dump_filter(&rth, tc_qdisc_block_exists_cb, &ctx) < 0) {
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+ perror("Dump terminated\n");
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+ return false;
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+ }
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+
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+ return ctx.found;
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+}
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diff --git a/tc/tc_util.h b/tc/tc_util.h
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index 5c54ad384eae6..8344c11833ee8 100644
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--- a/tc/tc_util.h
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+++ b/tc/tc_util.h
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@@ -122,4 +122,6 @@ int prio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt);
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int cls_names_init(char *path);
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void cls_names_uninit(void);
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+bool tc_qdisc_block_exists(__u32 block_index);
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+
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#endif
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--
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2.20.1
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