From: "Michal Koutný" <mkoutny@suse.com>
To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org, cake@lists.bufferbloat.net
Cc: "David S . Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>,
"Jamal Hadi Salim" <jhs@mojatatu.com>,
"Cong Wang" <xiyou.wangcong@gmail.com>,
"Jiri Pirko" <jiri@resnulli.us>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>, "Jiri Olsa" <jolsa@kernel.org>,
"Toke Høiland-Jørgensen" <toke@toke.dk>,
"Vinicius Costa Gomes" <vinicius.gomes@intel.com>,
"Stephen Hemminger" <stephen@networkplumber.org>,
"Simon Horman" <horms@kernel.org>,
"Pedro Tammela" <pctammela@mojatatu.com>
Subject: [PATCH v5 3/4] net/sched: Load modules via their alias
Date: Thu, 1 Feb 2024 14:09:42 +0100 [thread overview]
Message-ID: <20240201130943.19536-4-mkoutny@suse.com> (raw)
In-Reply-To: <20240201130943.19536-1-mkoutny@suse.com>
The cls_,sch_,act_ modules may be loaded lazily during network
configuration but without user's awareness and control.
Switch the lazy loading from canonical module names to a module alias.
This allows finer control over lazy loading, the precedent from
commit 7f78e0351394 ("fs: Limit sys_mount to only request filesystem
modules.") explains it already:
Using aliases means user space can control the policy of which
filesystem^W net/sched modules are auto-loaded by editing
/etc/modprobe.d/*.conf with blacklist and alias directives.
Allowing simple, safe, well understood work-arounds to known
problematic software.
By default, nothing changes. However, if a specific module is
blacklisted (its canonical name), it won't be modprobe'd when requested
under its alias (i.e. kernel auto-loading). It would appear as if the
given module was unknown.
The module can still be loaded under its canonical name, which is an
explicit (privileged) user action.
Signed-off-by: Michal Koutný <mkoutny@suse.com>
---
net/sched/act_api.c | 2 +-
net/sched/cls_api.c | 2 +-
net/sched/sch_api.c | 4 ++--
3 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 3e30d7260493..9ee622fb1160 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1363,7 +1363,7 @@ struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, u32 flags,
if (rtnl_held)
rtnl_unlock();
- request_module("act_%s", act_name);
+ request_module(NET_ACT_ALIAS_PREFIX "%s", act_name);
if (rtnl_held)
rtnl_lock();
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index ff3d396a65aa..ca5676b2668e 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -257,7 +257,7 @@ tcf_proto_lookup_ops(const char *kind, bool rtnl_held,
#ifdef CONFIG_MODULES
if (rtnl_held)
rtnl_unlock();
- request_module("cls_%s", kind);
+ request_module(NET_CLS_ALIAS_PREFIX "%s", kind);
if (rtnl_held)
rtnl_lock();
ops = __tcf_proto_lookup_ops(kind);
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 36b025cc4fd2..9d928f6a473a 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -228,7 +228,7 @@ int qdisc_set_default(const char *name)
if (!ops) {
/* Not found, drop lock and try to load module */
write_unlock(&qdisc_mod_lock);
- request_module("sch_%s", name);
+ request_module(NET_SCH_ALIAS_PREFIX "%s", name);
write_lock(&qdisc_mod_lock);
ops = qdisc_lookup_default(name);
@@ -1275,7 +1275,7 @@ static struct Qdisc *qdisc_create(struct net_device *dev,
* go away in the mean time.
*/
rtnl_unlock();
- request_module("sch_%s", name);
+ request_module(NET_SCH_ALIAS_PREFIX "%s", name);
rtnl_lock();
ops = qdisc_lookup_ops(kind);
if (ops != NULL) {
--
2.43.0
next prev parent reply other threads:[~2024-02-01 13:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-01 13:09 [PATCH v5 0/4] net/sched: Load modules via alias Michal Koutný
2024-02-01 13:09 ` [PATCH v5 1/4] net/sched: Add helper macros with module names Michal Koutný
2024-02-01 13:09 ` [PATCH v5 2/4] net/sched: Add module aliases for cls_,sch_,act_ modules Michal Koutný
2024-02-01 13:09 ` Michal Koutný [this message]
2024-02-01 13:09 ` [PATCH v5 4/4] net/sched: Remove alias of sch_clsact Michal Koutný
2024-02-02 12:08 ` [PATCH v5 0/4] net/sched: Load modules via alias Jamal Hadi Salim
2024-02-02 12:21 ` Jiri Pirko
2024-02-02 19:10 ` patchwork-bot+netdevbpf
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