From de6d5cdf881353f83006d5f3e28ac4fffd42145e Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Fri, 4 Sep 2009 06:41:16 +0000 Subject: [PATCH] net_sched: make cls_ops->change and cls_ops->delete optional Some schedulers don't support creating, changing or deleting classes. Make the respective callbacks optionally and consistently return -EOPNOTSUPP for unsupported operations, instead of currently either -EOPNOTSUPP, -ENOSYS or no error. In case of sch_prio and sch_multiq, the removed operations additionally checked for an invalid class. This is not necessary since the class argument can only orginate from ->get() or in case of ->change is 0 for creation of new classes, in which case ->change() incorrectly returned -ENOENT. As a side-effect, this patch fixes a possible (root-only) NULL pointer function call in sch_ingress, which didn't implement a so far mandatory ->delete() operation. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/sched/sch_api.c | 8 ++++++-- net/sched/sch_ingress.c | 7 ------- net/sched/sch_multiq.c | 22 ---------------------- net/sched/sch_prio.c | 21 --------------------- net/sched/sch_red.c | 13 ------------- net/sched/sch_sfq.c | 7 ------- net/sched/sch_tbf.c | 13 ------------- 7 files changed, 6 insertions(+), 85 deletions(-) diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index bef2d645a366..166fcca86e7a 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1417,7 +1417,9 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) goto out; break; case RTM_DELTCLASS: - err = cops->delete(q, cl); + err = -EOPNOTSUPP; + if (cops->delete) + err = cops->delete(q, cl); if (err == 0) tclass_notify(skb, n, q, cl, RTM_DELTCLASS); goto out; @@ -1431,7 +1433,9 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) } new_cl = cl; - err = cops->change(q, clid, pid, tca, &new_cl); + err = -EOPNOTSUPP; + if (cops->change) + err = cops->change(q, clid, pid, tca, &new_cl); if (err == 0) tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c index ace7902b5097..a9e646bdb605 100644 --- a/net/sched/sch_ingress.c +++ b/net/sched/sch_ingress.c @@ -42,12 +42,6 @@ static void ingress_put(struct Qdisc *sch, unsigned long cl) { } -static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent, - struct nlattr **tca, unsigned long *arg) -{ - return 0; -} - static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) { return; @@ -120,7 +114,6 @@ static const struct Qdisc_class_ops ingress_class_ops = { .leaf = ingress_leaf, .get = ingress_get, .put = ingress_put, - .change = ingress_change, .walk = ingress_walk, .tcf_chain = ingress_find_tcf, .bind_tcf = ingress_bind_filter, diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c index 912731203047..a0ffe7158ff3 100644 --- a/net/sched/sch_multiq.c +++ b/net/sched/sch_multiq.c @@ -348,26 +348,6 @@ static void multiq_put(struct Qdisc *q, unsigned long cl) return; } -static int multiq_change(struct Qdisc *sch, u32 handle, u32 parent, - struct nlattr **tca, unsigned long *arg) -{ - unsigned long cl = *arg; - struct multiq_sched_data *q = qdisc_priv(sch); - - if (cl - 1 > q->bands) - return -ENOENT; - return 0; -} - -static int multiq_delete(struct Qdisc *sch, unsigned long cl) -{ - struct multiq_sched_data *q = qdisc_priv(sch); - if (cl - 1 > q->bands) - return -ENOENT; - return 0; -} - - static int multiq_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb, struct tcmsg *tcm) { @@ -430,8 +410,6 @@ static const struct Qdisc_class_ops multiq_class_ops = { .leaf = multiq_leaf, .get = multiq_get, .put = multiq_put, - .change = multiq_change, - .delete = multiq_delete, .walk = multiq_walk, .tcf_chain = multiq_find_tcf, .bind_tcf = multiq_bind, diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c index 94cecef70145..209a4ca4b98d 100644 --- a/net/sched/sch_prio.c +++ b/net/sched/sch_prio.c @@ -311,25 +311,6 @@ static void prio_put(struct Qdisc *q, unsigned long cl) return; } -static int prio_change(struct Qdisc *sch, u32 handle, u32 parent, struct nlattr **tca, unsigned long *arg) -{ - unsigned long cl = *arg; - struct prio_sched_data *q = qdisc_priv(sch); - - if (cl - 1 > q->bands) - return -ENOENT; - return 0; -} - -static int prio_delete(struct Qdisc *sch, unsigned long cl) -{ - struct prio_sched_data *q = qdisc_priv(sch); - if (cl - 1 > q->bands) - return -ENOENT; - return 0; -} - - static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb, struct tcmsg *tcm) { @@ -392,8 +373,6 @@ static const struct Qdisc_class_ops prio_class_ops = { .leaf = prio_leaf, .get = prio_get, .put = prio_put, - .change = prio_change, - .delete = prio_delete, .walk = prio_walk, .tcf_chain = prio_find_tcf, .bind_tcf = prio_bind, diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c index c27b8023f079..a2c4d1aa3cb1 100644 --- a/net/sched/sch_red.c +++ b/net/sched/sch_red.c @@ -308,17 +308,6 @@ static void red_put(struct Qdisc *sch, unsigned long arg) return; } -static int red_change_class(struct Qdisc *sch, u32 classid, u32 parentid, - struct nlattr **tca, unsigned long *arg) -{ - return -ENOSYS; -} - -static int red_delete(struct Qdisc *sch, unsigned long cl) -{ - return -ENOSYS; -} - static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker) { if (!walker->stop) { @@ -336,8 +325,6 @@ static const struct Qdisc_class_ops red_class_ops = { .leaf = red_leaf, .get = red_get, .put = red_put, - .change = red_change_class, - .delete = red_delete, .walk = red_walk, .dump = red_dump_class, }; diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c index 8706920a6d45..cb21380c0605 100644 --- a/net/sched/sch_sfq.c +++ b/net/sched/sch_sfq.c @@ -496,12 +496,6 @@ nla_put_failure: return -1; } -static int sfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, - struct nlattr **tca, unsigned long *arg) -{ - return -EOPNOTSUPP; -} - static unsigned long sfq_get(struct Qdisc *sch, u32 classid) { return 0; @@ -560,7 +554,6 @@ static void sfq_walk(struct Qdisc *sch, struct qdisc_walker *arg) static const struct Qdisc_class_ops sfq_class_ops = { .get = sfq_get, - .change = sfq_change_class, .tcf_chain = sfq_find_tcf, .dump = sfq_dump_class, .dump_stats = sfq_dump_class_stats, diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c index 28909699d24d..d904167e73b3 100644 --- a/net/sched/sch_tbf.c +++ b/net/sched/sch_tbf.c @@ -410,17 +410,6 @@ static void tbf_put(struct Qdisc *sch, unsigned long arg) { } -static int tbf_change_class(struct Qdisc *sch, u32 classid, u32 parentid, - struct nlattr **tca, unsigned long *arg) -{ - return -ENOSYS; -} - -static int tbf_delete(struct Qdisc *sch, unsigned long arg) -{ - return -ENOSYS; -} - static void tbf_walk(struct Qdisc *sch, struct qdisc_walker *walker) { if (!walker->stop) { @@ -439,8 +428,6 @@ static const struct Qdisc_class_ops tbf_class_ops = .leaf = tbf_leaf, .get = tbf_get, .put = tbf_put, - .change = tbf_change_class, - .delete = tbf_delete, .walk = tbf_walk, .dump = tbf_dump_class, }; -- 2.30.2