linux-kernel - [PATCH] net: Allow tc changes in user namespaces

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Message-Id: <1398871543-8435-1-git-send-email-stgraber@ubuntu.com>
Date:	Wed, 30 Apr 2014 11:25:43 -0400
From:	Stéphane Graber <stgraber@...ntu.com>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org, containers@...ts.linux-foundation.org,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Stéphane Graber <stgraber@...ntu.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH] net: Allow tc changes in user namespaces

This switches a few remaining capable(CAP_NET_ADMIN) to ns_capable so
that root in a user namespace may set tc rules inside that namespace.

Signed-off-by: Stéphane Graber <stgraber@...ntu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@...ntu.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Jamal Hadi Salim <jhs@...atatu.com>
Cc: "David S. Miller" <davem@...emloft.net>

---
 net/sched/cls_api.c | 3 ++-
 net/sched/sch_api.c | 8 +++++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 8e118af..4c35f4a 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -138,7 +138,8 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 	int err;
 	int tp_created = 0;
 
-	if ((n->nlmsg_type != RTM_GETTFILTER) && !capable(CAP_NET_ADMIN))
+	if ((n->nlmsg_type != RTM_GETTFILTER) &&
+	    !ns_capable(net->user_ns, CAP_NET_ADMIN))
 		return -EPERM;
 
 replay:
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index cd81505..fc90bde 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1079,7 +1079,8 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
 	struct Qdisc *p = NULL;
 	int err;
 
-	if ((n->nlmsg_type != RTM_GETQDISC) && !capable(CAP_NET_ADMIN))
+	if ((n->nlmsg_type != RTM_GETQDISC) &&
+	    !ns_capable(net->user_ns, CAP_NET_ADMIN))
 		return -EPERM;
 
 	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
@@ -1146,7 +1147,7 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
 	struct Qdisc *q, *p;
 	int err;
 
-	if (!capable(CAP_NET_ADMIN))
+	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 		return -EPERM;
 
 replay:
@@ -1486,7 +1487,8 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n)
 	u32 qid;
 	int err;
 
-	if ((n->nlmsg_type != RTM_GETTCLASS) && !capable(CAP_NET_ADMIN))
+	if ((n->nlmsg_type != RTM_GETTCLASS) &&
+	    !ns_capable(net->user_ns, CAP_NET_ADMIN))
 		return -EPERM;
 
 	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
-- 
1.9.1

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