net_sched: act: Dont increment refcnt on replace
This is a bug fix. The existing code tries to kill many birds with one stone: Handling binding of actions to filters, new actions and replacing of action attributes. A simple test case to illustrate: XXXX moja@fe1:~$ sudo tc actions add action drop index 12 moja@fe1:~$ actions get action gact index 12 action order 1: gact action drop random type none pass val 0 index 12 ref 1 bind 0 moja@fe1:~$ sudo tc actions replace action ok index 12 moja@fe1:~$ actions get action gact index 12 action order 1: gact action drop random type none pass val 0 index 12 ref 2 bind 0 XXXX The above shows the refcounf being wrongly incremented on replace. There are more complex scenarios with binding of actions to filters that i am leaving out that didnt work as well... Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -77,16 +77,16 @@ static int tcf_csum_init(struct net *n, struct nlattr *nla, struct nlattr *est,
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&csum_idx_gen, &csum_hash_info);
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&csum_idx_gen, &csum_hash_info);
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if (IS_ERR(pc))
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if (IS_ERR(pc))
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return PTR_ERR(pc);
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return PTR_ERR(pc);
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p = to_tcf_csum(pc);
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ret = ACT_P_CREATED;
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ret = ACT_P_CREATED;
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} else {
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} else {
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p = to_tcf_csum(pc);
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if (bind)/* dont override defaults */
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if (!ovr) {
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return 0;
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tcf_hash_release(pc, bind, &csum_hash_info);
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tcf_hash_release(pc, bind, &csum_hash_info);
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if (!ovr)
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return -EEXIST;
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return -EEXIST;
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}
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}
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}
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p = to_tcf_csum(pc);
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spin_lock_bh(&p->tcf_lock);
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spin_lock_bh(&p->tcf_lock);
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p->tcf_action = parm->action;
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p->tcf_action = parm->action;
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p->update_flags = parm->update_flags;
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p->update_flags = parm->update_flags;
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@ -102,11 +102,12 @@ static int tcf_gact_init(struct net *net, struct nlattr *nla,
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return PTR_ERR(pc);
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return PTR_ERR(pc);
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ret = ACT_P_CREATED;
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ret = ACT_P_CREATED;
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} else {
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} else {
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if (!ovr) {
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if (bind)/* dont override defaults */
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return 0;
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tcf_hash_release(pc, bind, &gact_hash_info);
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tcf_hash_release(pc, bind, &gact_hash_info);
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if (!ovr)
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return -EEXIST;
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return -EEXIST;
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}
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}
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}
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gact = to_gact(pc);
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gact = to_gact(pc);
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@ -141,11 +141,13 @@ static int tcf_ipt_init(struct net *net, struct nlattr *nla, struct nlattr *est,
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return PTR_ERR(pc);
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return PTR_ERR(pc);
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ret = ACT_P_CREATED;
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ret = ACT_P_CREATED;
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} else {
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} else {
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if (!ovr) {
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if (bind)/* dont override defaults */
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return 0;
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tcf_ipt_release(to_ipt(pc), bind);
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tcf_ipt_release(to_ipt(pc), bind);
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if (!ovr)
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return -EEXIST;
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return -EEXIST;
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}
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}
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}
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ipt = to_ipt(pc);
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ipt = to_ipt(pc);
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hook = nla_get_u32(tb[TCA_IPT_HOOK]);
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hook = nla_get_u32(tb[TCA_IPT_HOOK]);
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@ -70,15 +70,15 @@ static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
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&nat_idx_gen, &nat_hash_info);
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&nat_idx_gen, &nat_hash_info);
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if (IS_ERR(pc))
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if (IS_ERR(pc))
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return PTR_ERR(pc);
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return PTR_ERR(pc);
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p = to_tcf_nat(pc);
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ret = ACT_P_CREATED;
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ret = ACT_P_CREATED;
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} else {
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} else {
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p = to_tcf_nat(pc);
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if (bind)
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if (!ovr) {
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return 0;
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tcf_hash_release(pc, bind, &nat_hash_info);
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tcf_hash_release(pc, bind, &nat_hash_info);
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if (!ovr)
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return -EEXIST;
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return -EEXIST;
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}
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}
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}
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p = to_tcf_nat(pc);
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spin_lock_bh(&p->tcf_lock);
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spin_lock_bh(&p->tcf_lock);
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p->old_addr = parm->old_addr;
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p->old_addr = parm->old_addr;
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@ -84,10 +84,12 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
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ret = ACT_P_CREATED;
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ret = ACT_P_CREATED;
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} else {
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} else {
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p = to_pedit(pc);
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p = to_pedit(pc);
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if (!ovr) {
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tcf_hash_release(pc, bind, &pedit_hash_info);
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tcf_hash_release(pc, bind, &pedit_hash_info);
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if (bind)
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return 0;
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if (!ovr)
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return -EEXIST;
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return -EEXIST;
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}
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if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
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if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
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keys = kmalloc(ksize, GFP_KERNEL);
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keys = kmalloc(ksize, GFP_KERNEL);
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if (keys == NULL)
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if (keys == NULL)
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@ -177,10 +177,12 @@ static int tcf_act_police_locate(struct net *net, struct nlattr *nla,
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if (bind) {
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if (bind) {
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police->tcf_bindcnt += 1;
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police->tcf_bindcnt += 1;
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police->tcf_refcnt += 1;
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police->tcf_refcnt += 1;
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return 0;
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}
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}
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if (ovr)
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if (ovr)
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goto override;
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goto override;
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return ret;
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/* not replacing */
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return -EEXIST;
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}
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}
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}
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}
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@ -142,10 +142,13 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
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ret = ACT_P_CREATED;
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ret = ACT_P_CREATED;
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} else {
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} else {
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d = to_defact(pc);
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d = to_defact(pc);
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if (!ovr) {
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if (bind)
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return 0;
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tcf_simp_release(d, bind);
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tcf_simp_release(d, bind);
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if (!ovr)
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return -EEXIST;
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return -EEXIST;
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}
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reset_policy(d, defdata, parm);
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reset_policy(d, defdata, parm);
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}
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}
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@ -120,11 +120,12 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
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ret = ACT_P_CREATED;
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ret = ACT_P_CREATED;
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} else {
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} else {
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d = to_skbedit(pc);
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d = to_skbedit(pc);
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if (!ovr) {
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if (bind)
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return 0;
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tcf_hash_release(pc, bind, &skbedit_hash_info);
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tcf_hash_release(pc, bind, &skbedit_hash_info);
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if (!ovr)
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return -EEXIST;
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return -EEXIST;
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}
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}
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}
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spin_lock_bh(&d->tcf_lock);
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spin_lock_bh(&d->tcf_lock);
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