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net sched: mirred action fix late binding 

The process below was broken and is fixed with this patch.

//add an mirred action and give it an instance id of 1
sudo tc actions add action mirred egress mirror dev $MDEV  index 1
//create a filter which binds to mirred action id 1
sudo tc filter add dev $DEV parent ffff: protocol ip prio 1 u32\
match ip dst 17.0.0.1/32 flowid 1:10 action mirred index 1

Message before bug fix was:
RTNETLINK answers: Invalid argument
We have an error talking to the kernel

Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim 2016-05-10 16:49:28 -04:00 committed by David S. Miller
parent a57f19d30b
commit 87dfbdc6c7
1 changed files with 13 additions and 6 deletions
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19
net/sched/act_mirred.c
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@ -61,7 +61,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
struct tc_mirred *parm; struct tc_mirred *parm;
struct tcf_mirred *m; struct tcf_mirred *m;
struct net_device *dev; struct net_device *dev;
int ret, ok_push = 0; int ret, ok_push = 0, exists = 0;
if (nla == NULL) if (nla == NULL)
return -EINVAL; return -EINVAL;
@ -71,17 +71,27 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
if (tb[TCA_MIRRED_PARMS] == NULL) if (tb[TCA_MIRRED_PARMS] == NULL)
return -EINVAL; return -EINVAL;
parm = nla_data(tb[TCA_MIRRED_PARMS]); parm = nla_data(tb[TCA_MIRRED_PARMS]);
exists = tcf_hash_check(tn, parm->index, a, bind);
if (exists && bind)
return 0;
switch (parm->eaction) { switch (parm->eaction) {
case TCA_EGRESS_MIRROR: case TCA_EGRESS_MIRROR:
case TCA_EGRESS_REDIR: case TCA_EGRESS_REDIR:
break; break;
default: default:
if (exists)
tcf_hash_release(a, bind);
return -EINVAL; return -EINVAL;
} }
if (parm->ifindex) { if (parm->ifindex) {
dev = __dev_get_by_index(net, parm->ifindex); dev = __dev_get_by_index(net, parm->ifindex);
if (dev == NULL) if (dev == NULL) {
if (exists)
tcf_hash_release(a, bind);
return -ENODEV; return -ENODEV;
}
switch (dev->type) { switch (dev->type) {
case ARPHRD_TUNNEL: case ARPHRD_TUNNEL:
case ARPHRD_TUNNEL6: case ARPHRD_TUNNEL6:
@ -99,7 +109,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
dev = NULL; dev = NULL;
} }
if (!tcf_hash_check(tn, parm->index, a, bind)) { if (!exists) {
if (dev == NULL) if (dev == NULL)
return -EINVAL; return -EINVAL;
ret = tcf_hash_create(tn, parm->index, est, a, ret = tcf_hash_create(tn, parm->index, est, a,
@ -108,9 +118,6 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
return ret; return ret;
ret = ACT_P_CREATED; ret = ACT_P_CREATED;
} else { } else {
if (bind)
return 0;
tcf_hash_release(a, bind); tcf_hash_release(a, bind);
if (!ovr) if (!ovr)
return -EEXIST; return -EEXIST;