From: Boris Sukholitko boris.sukholitko@broadcom.com
[ Upstream commit 9c5eee0afca09cbde6bd00f77876754aaa552970 ]
Currently vlan modification action checks existence of vlan priority by comparing it to 0. Therefore it is impossible to modify existing vlan tag to have priority 0.
For example, the following tc command will change the vlan id but will not affect vlan priority:
tc filter add dev eth1 ingress matchall action vlan modify id 300 \ priority 0 pipe mirred egress redirect dev eth2
The incoming packet on eth1:
ethertype 802.1Q (0x8100), vlan 200, p 4, ethertype IPv4
will be changed to:
ethertype 802.1Q (0x8100), vlan 300, p 4, ethertype IPv4
although the user has intended to have p == 0.
The fix is to add tcfv_push_prio_exists flag to struct tcf_vlan_params and rely on it when deciding to set the priority.
Fixes: 45a497f2d149a4a8061c (net/sched: act_vlan: Introduce TCA_VLAN_ACT_MODIFY vlan action) Signed-off-by: Boris Sukholitko boris.sukholitko@broadcom.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- include/net/tc_act/tc_vlan.h | 1 + net/sched/act_vlan.c | 7 +++++-- 2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/include/net/tc_act/tc_vlan.h b/include/net/tc_act/tc_vlan.h index 4e2502408c31..add6fb50dd33 100644 --- a/include/net/tc_act/tc_vlan.h +++ b/include/net/tc_act/tc_vlan.h @@ -14,6 +14,7 @@ struct tcf_vlan_params { u16 tcfv_push_vid; __be16 tcfv_push_proto; u8 tcfv_push_prio; + bool tcfv_push_prio_exists; struct rcu_head rcu; };
diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c index 3c26042f4ea6..7dc76c68ec52 100644 --- a/net/sched/act_vlan.c +++ b/net/sched/act_vlan.c @@ -70,7 +70,7 @@ static int tcf_vlan_act(struct sk_buff *skb, const struct tc_action *a, /* replace the vid */ tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid; /* replace prio bits, if tcfv_push_prio specified */ - if (p->tcfv_push_prio) { + if (p->tcfv_push_prio_exists) { tci &= ~VLAN_PRIO_MASK; tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT; } @@ -107,6 +107,7 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla, struct tc_action_net *tn = net_generic(net, vlan_net_id); struct nlattr *tb[TCA_VLAN_MAX + 1]; struct tcf_chain *goto_ch = NULL; + bool push_prio_exists = false; struct tcf_vlan_params *p; struct tc_vlan *parm; struct tcf_vlan *v; @@ -175,7 +176,8 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla, push_proto = htons(ETH_P_8021Q); }
- if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) + push_prio_exists = !!tb[TCA_VLAN_PUSH_VLAN_PRIORITY]; + if (push_prio_exists) push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]); break; default: @@ -216,6 +218,7 @@ static int tcf_vlan_init(struct net *net, struct nlattr *nla, p->tcfv_action = action; p->tcfv_push_vid = push_vid; p->tcfv_push_prio = push_prio; + p->tcfv_push_prio_exists = push_prio_exists || action == TCA_VLAN_ACT_PUSH; p->tcfv_push_proto = push_proto;
spin_lock_bh(&v->tcf_lock);