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net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode 

When u32_replace_hw_knode fails, we need to undo the tcf_bind_filter
operation done at u32_set_parms.

Fixes: d34e3e1813 ("net: cls_u32: Add support for skip-sw flag to tc u32 classifier.")
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Victor Nogueira 2023-07-13 15:05:11 -03:00 committed by David S. Miller
parent b3d0e04894
commit 9cb36faede
1 changed files with 30 additions and 11 deletions
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41
net/sched/cls_u32.c
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@ -712,8 +712,23 @@ static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
[TCA_U32_FLAGS] = { .type = NLA_U32 },
};
static void u32_unbind_filter(struct tcf_proto *tp, struct tc_u_knode *n,
struct nlattr **tb)
{
if (tb[TCA_U32_CLASSID])
tcf_unbind_filter(tp, &n->res);
}
static void u32_bind_filter(struct tcf_proto *tp, struct tc_u_knode *n,
unsigned long base, struct nlattr **tb)
{
if (tb[TCA_U32_CLASSID]) {
n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
tcf_bind_filter(tp, &n->res, base);
}
}
static int u32_set_parms(struct net *net, struct tcf_proto *tp,
unsigned long base,
struct tc_u_knode *n, struct nlattr **tb,
struct nlattr *est, u32 flags, u32 fl_flags,
struct netlink_ext_ack *extack)
@ -760,10 +775,6 @@ static int u32_set_parms(struct net *net, struct tcf_proto *tp,
if (ht_old)
ht_old->refcnt--;
}
if (tb[TCA_U32_CLASSID]) {
n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
tcf_bind_filter(tp, &n->res, base);
}
if (ifindex >= 0)
n->ifindex = ifindex;
@ -903,17 +914,20 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
if (!new)
return -ENOMEM;
err = u32_set_parms(net, tp, base, new, tb,
tca[TCA_RATE], flags, new->flags,
extack);
err = u32_set_parms(net, tp, new, tb, tca[TCA_RATE],
flags, new->flags, extack);
if (err) {
__u32_destroy_key(new);
return err;
}
u32_bind_filter(tp, new, base, tb);
err = u32_replace_hw_knode(tp, new, flags, extack);
if (err) {
u32_unbind_filter(tp, new, tb);
__u32_destroy_key(new);
return err;
}
@ -1074,15 +1088,18 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
}
#endif
err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE],
err = u32_set_parms(net, tp, n, tb, tca[TCA_RATE],
flags, n->flags, extack);
u32_bind_filter(tp, n, base, tb);
if (err == 0) {
struct tc_u_knode __rcu **ins;
struct tc_u_knode *pins;
err = u32_replace_hw_knode(tp, n, flags, extack);
if (err)
goto errhw;
goto errunbind;
if (!tc_in_hw(n->flags))
n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
@ -1100,7 +1117,9 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
return 0;
}
errhw:
errunbind:
u32_unbind_filter(tp, n, tb);
#ifdef CONFIG_CLS_U32_MARK
free_percpu(n->pcpu_success);
#endif