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Message-ID: <20240124153456.117048-3-victor@mojatatu.com>
Date: Wed, 24 Jan 2024 12:34:56 -0300
From: Victor Nogueira <victor@...atatu.com>
To: stephen@...workplumber.org,
dsahern@...nel.org,
netdev@...r.kernel.org
Cc: liuhangbin@...il.com,
jhs@...atatu.com,
kernel@...atatu.com
Subject: [PATCH iproute2-next 2/2] tc: Add NLM_F_ECHO support for filters
If the user specifies this flag for a filter command the kernel will
return the command's result back to user space.
For example:
tc -echo filter add dev lo parent ffff: protocol ip matchall action ok
added filter dev lo parent ffff: protocol ip pref 49152 matchall chain 0
As illustrated above, the kernel will give us a pref of 491252
The same can be done for other filter commands (replace, delete, and
change). For example:
tc -echo filter del dev lo parent ffff: pref 49152 protocol ip matchall
deleted filter dev lo parent ffff: protocol ip pref 49152 matchall chain 0
Signed-off-by: Victor Nogueira <victor@...atatu.com>
---
tc/tc_filter.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/tc/tc_filter.c b/tc/tc_filter.c
index eb45c5887..54790ddc6 100644
--- a/tc/tc_filter.c
+++ b/tc/tc_filter.c
@@ -76,6 +76,7 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
char d[IFNAMSIZ] = {};
char k[FILTER_NAMESZ] = {};
struct tc_estimator est = {};
+ int ret;
if (cmd == RTM_NEWTFILTER && flags & NLM_F_CREATE)
protocol = htons(ETH_P_ALL);
@@ -221,7 +222,12 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
if (est.ewma_log)
addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
- if (rtnl_talk(&rth, &req.n, NULL) < 0) {
+ if (echo_request)
+ ret = rtnl_echo_talk(&rth, &req.n, json, print_filter);
+ else
+ ret = rtnl_talk(&rth, &req.n, NULL);
+
+ if (ret < 0) {
fprintf(stderr, "We have an error talking to the kernel\n");
return 2;
}
--
2.25.1
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