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Message-Id: <20200616063902.15605-1-littlesmilingcloud@gmail.com>
Date: Tue, 16 Jun 2020 09:39:02 +0300
From: Anton Danilov <littlesmilingcloud@...il.com>
To: netdev@...r.kernel.org, stephen@...workplumber.org
Cc: Anton Danilov <littlesmilingcloud@...il.com>
Subject: [PATCH v2] tc: qdisc: filter qdisc's by parent/handle specification
There wasn't a way to get a qdisc info by handle or parent, only full
dump of qdisc's with following grep/sed usage.
The 'qdisc get' command have been added.
tc qdisc { show | get } [ dev STRING ] [ QDISC_ID ] [ invisible ]
QDISC_ID := { root | ingress | handle QHANDLE | parent CLASSID }
This change doesn't require any changes in the kernel.
Signed-off-by: Anton Danilov <littlesmilingcloud@...il.com>
---
changes since v1:
coding style fixes
---
man/man8/tc.8 | 8 +++-
tc/tc_qdisc.c | 111 +++++++++++++++++++++++++++++++++++---------------
2 files changed, 84 insertions(+), 35 deletions(-)
diff --git a/man/man8/tc.8 b/man/man8/tc.8
index e8e0cd0f..8753088f 100644
--- a/man/man8/tc.8
+++ b/man/man8/tc.8
@@ -77,9 +77,13 @@ tc \- show / manipulate traffic control settings
.B tc
.RI "[ " OPTIONS " ]"
.RI "[ " FORMAT " ]"
-.B qdisc show [ dev
+.B qdisc { show | get } [ dev
\fIDEV\fR
-.B ]
+.B ] [ root | ingress | handle
+\fIQHANDLE\fR
+.B | parent
+\fICLASSID\fR
+.B ] [ invisible ]
.P
.B tc
.RI "[ " OPTIONS " ]"
diff --git a/tc/tc_qdisc.c b/tc/tc_qdisc.c
index 181fe2f0..af2dd1c8 100644
--- a/tc/tc_qdisc.c
+++ b/tc/tc_qdisc.c
@@ -35,11 +35,12 @@ static int usage(void)
" [ ingress_block BLOCK_INDEX ] [ egress_block BLOCK_INDEX ]\n"
" [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n"
"\n"
- " tc qdisc show [ dev STRING ] [ ingress | clsact ] [ invisible ]\n"
+ " tc qdisc { show | get } [ dev STRING ] [ QDISC_ID ] [ invisible ]\n"
"Where:\n"
"QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n"
"OPTIONS := ... try tc qdisc add <desired QDISC_KIND> help\n"
- "STAB_OPTIONS := ... try tc qdisc add stab help\n");
+ "STAB_OPTIONS := ... try tc qdisc add stab help\n"
+ "QDISC_ID := { root | ingress | handle QHANDLE | parent CLASSID }\n");
return -1;
}
@@ -212,6 +213,8 @@ static int tc_qdisc_modify(int cmd, unsigned int flags, int argc, char **argv)
}
static int filter_ifindex;
+static __u32 filter_parent;
+static __u32 filter_handle;
int print_qdisc(struct nlmsghdr *n, void *arg)
{
@@ -235,6 +238,12 @@ int print_qdisc(struct nlmsghdr *n, void *arg)
if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
return 0;
+ if (filter_handle && filter_handle != t->tcm_handle)
+ return 0;
+
+ if (filter_parent && filter_parent != t->tcm_parent)
+ return 0;
+
parse_rtattr_flags(tb, TCA_MAX, TCA_RTA(t), len, NLA_F_NESTED);
if (tb[TCA_KIND] == NULL) {
@@ -344,21 +353,70 @@ int print_qdisc(struct nlmsghdr *n, void *arg)
static int tc_qdisc_list(int argc, char **argv)
{
- struct tcmsg t = { .tcm_family = AF_UNSPEC };
+ struct {
+ struct nlmsghdr n;
+ struct tcmsg t;
+ char buf[256];
+ } req = {
+ .n.nlmsg_type = RTM_GETQDISC,
+ .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
+ .t.tcm_family = AF_UNSPEC,
+ };
+
char d[IFNAMSIZ] = {};
+ bool arg_error = false;
bool dump_invisible = false;
+ __u32 handle;
- while (argc > 0) {
+ while (argc > 0 && !arg_error) {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
strncpy(d, *argv, sizeof(d)-1);
+ } else if (strcmp(*argv, "root") == 0) {
+ if (filter_parent || filter_handle) {
+ fprintf(stderr,
+ "only one of parent/handle/root/ingress can be specified\n");
+ arg_error = true;
+ break;
+ }
+ filter_parent = TC_H_ROOT;
} else if (strcmp(*argv, "ingress") == 0 ||
strcmp(*argv, "clsact") == 0) {
- if (t.tcm_parent) {
- fprintf(stderr, "Duplicate parent ID\n");
- usage();
+ if (filter_parent || filter_handle) {
+ fprintf(stderr,
+ "only one of parent/handle/root/ingress can be specified\n");
+ arg_error = true;
+ break;
}
- t.tcm_parent = TC_H_INGRESS;
+ filter_parent = TC_H_INGRESS;
+ } else if (matches(*argv, "parent") == 0) {
+ if (filter_parent || filter_handle) {
+ fprintf(stderr,
+ "only one of parent/handle/root/ingress can be specified\n");
+ arg_error = true;
+ break;
+ }
+ NEXT_ARG();
+ if (get_tc_classid(&handle, *argv)) {
+ invarg("invalid parent ID", *argv);
+ arg_error = true;
+ break;
+ }
+ filter_parent = handle;
+ } else if (matches(*argv, "handle") == 0) {
+ if (filter_parent || filter_handle) {
+ fprintf(stderr,
+ "only one of parent/handle/root/ingress can be specified\n");
+ arg_error = true;
+ break;
+ }
+ NEXT_ARG();
+ if (get_qdisc_handle(&handle, *argv)) {
+ invarg("invalid handle ID", *argv);
+ arg_error = true;
+ break;
+ }
+ filter_handle = handle;
} else if (matches(*argv, "help") == 0) {
usage();
} else if (strcmp(*argv, "invisible") == 0) {
@@ -371,35 +429,26 @@ static int tc_qdisc_list(int argc, char **argv)
argc--; argv++;
}
+ if (arg_error) {
+ /* argument error message should be already displayed above */
+ return -1;
+ }
+
ll_init_map(&rth);
if (d[0]) {
- t.tcm_ifindex = ll_name_to_index(d);
- if (!t.tcm_ifindex)
+ req.t.tcm_ifindex = ll_name_to_index(d);
+ if (!req.t.tcm_ifindex)
return -nodev(d);
- filter_ifindex = t.tcm_ifindex;
+ filter_ifindex = req.t.tcm_ifindex;
}
if (dump_invisible) {
- struct {
- struct nlmsghdr n;
- struct tcmsg t;
- char buf[256];
- } req = {
- .n.nlmsg_type = RTM_GETQDISC,
- .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
- };
-
- req.t.tcm_family = AF_UNSPEC;
-
addattr(&req.n, 256, TCA_DUMP_INVISIBLE);
- if (rtnl_dump_request_n(&rth, &req.n) < 0) {
- perror("Cannot send dump request");
- return 1;
- }
+ }
- } else if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
- perror("Cannot send dump request");
+ if (rtnl_dump_request_n(&rth, &req.n) < 0) {
+ perror("Cannot send request");
return 1;
}
@@ -427,12 +476,8 @@ int do_qdisc(int argc, char **argv)
return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return tc_qdisc_modify(RTM_DELQDISC, 0, argc-1, argv+1);
-#if 0
- if (matches(*argv, "get") == 0)
- return tc_qdisc_get(RTM_GETQDISC, 0, argc-1, argv+1);
-#endif
if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
- || matches(*argv, "lst") == 0)
+ || matches(*argv, "lst") == 0 || matches(*argv, "get") == 0)
return tc_qdisc_list(argc-1, argv+1);
if (matches(*argv, "help") == 0) {
usage();
--
2.26.2
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