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net: sched: sch_api: handle generic qdisc errors

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This patch adds extack support for generic qdisc handling. The extack
will be set deeper to each called function which is not part of netdev
core api.

Cc: David Ahern <dsahern@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Aring 2017-12-20 12:35:12 -05:00 committed by David S. Miller
parent ac8ef4ab73
commit 0921559811
1 changed files with 105 additions and 43 deletions
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148
net/sched/sch_api.c
View File

@ -449,7 +449,8 @@ static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
[TCA_STAB_DATA] = { .type = NLA_BINARY },
};
static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_STAB_MAX + 1];
struct qdisc_size_table *stab;
@ -458,23 +459,29 @@ static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
u16 *tab = NULL;
int err;
err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, NULL);
err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, extack);
if (err < 0)
return ERR_PTR(err);
if (!tb[TCA_STAB_BASE])
if (!tb[TCA_STAB_BASE]) {
NL_SET_ERR_MSG(extack, "Size table base attribute is missing");
return ERR_PTR(-EINVAL);
}
s = nla_data(tb[TCA_STAB_BASE]);
if (s->tsize > 0) {
if (!tb[TCA_STAB_DATA])
if (!tb[TCA_STAB_DATA]) {
NL_SET_ERR_MSG(extack, "Size table data attribute is missing");
return ERR_PTR(-EINVAL);
}
tab = nla_data(tb[TCA_STAB_DATA]);
tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
}
if (tsize != s->tsize || (!tab && tsize > 0))
if (tsize != s->tsize || (!tab && tsize > 0)) {
NL_SET_ERR_MSG(extack, "Invalid size of size table");
return ERR_PTR(-EINVAL);
}
list_for_each_entry(stab, &qdisc_stab_list, list) {
if (memcmp(&stab->szopts, s, sizeof(*s)))
@ -899,7 +906,8 @@ static void notify_and_destroy(struct net *net, struct sk_buff *skb,
static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
struct Qdisc *new, struct Qdisc *old)
struct Qdisc *new, struct Qdisc *old,
struct netlink_ext_ack *extack)
{
struct Qdisc *q = old;
struct net *net = dev_net(dev);
@ -914,8 +922,10 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
(new && new->flags & TCQ_F_INGRESS)) {
num_q = 1;
ingress = 1;
if (!dev_ingress_queue(dev))
if (!dev_ingress_queue(dev)) {
NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
return -ENOENT;
}
}
if (dev->flags & IFF_UP)
@ -966,10 +976,12 @@ skip:
if (cops && cops->graft) {
unsigned long cl = cops->find(parent, classid);
if (cl)
if (cl) {
err = cops->graft(parent, cl, new, &old);
else
} else {
NL_SET_ERR_MSG(extack, "Specified class not found");
err = -ENOENT;
}
}
if (!err)
notify_and_destroy(net, skb, n, classid, old, new);
@ -990,7 +1002,8 @@ static struct lock_class_key qdisc_rx_lock;
static struct Qdisc *qdisc_create(struct net_device *dev,
struct netdev_queue *dev_queue,
struct Qdisc *p, u32 parent, u32 handle,
struct nlattr **tca, int *errp)
struct nlattr **tca, int *errp,
struct netlink_ext_ack *extack)
{
int err;
struct nlattr *kind = tca[TCA_KIND];
@ -1028,8 +1041,10 @@ static struct Qdisc *qdisc_create(struct net_device *dev,
#endif
err = -ENOENT;
if (!ops)
if (!ops) {
NL_SET_ERR_MSG(extack, "Specified qdisc not found");
goto err_out;
}
sch = qdisc_alloc(dev_queue, ops);
if (IS_ERR(sch)) {
@ -1086,7 +1101,7 @@ static struct Qdisc *qdisc_create(struct net_device *dev,
}
if (tca[TCA_STAB]) {
stab = qdisc_get_stab(tca[TCA_STAB]);
stab = qdisc_get_stab(tca[TCA_STAB], extack);
if (IS_ERR(stab)) {
err = PTR_ERR(stab);
goto err_out4;
@ -1097,8 +1112,10 @@ static struct Qdisc *qdisc_create(struct net_device *dev,
seqcount_t *running;
err = -EOPNOTSUPP;
if (sch->flags & TCQ_F_MQROOT)
if (sch->flags & TCQ_F_MQROOT) {
NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc");
goto err_out4;
}
if (sch->parent != TC_H_ROOT &&
!(sch->flags & TCQ_F_INGRESS) &&
@ -1113,8 +1130,10 @@ static struct Qdisc *qdisc_create(struct net_device *dev,
NULL,
running,
tca[TCA_RATE]);
if (err)
if (err) {
NL_SET_ERR_MSG(extack, "Failed to generate new estimator");
goto err_out4;
}
}
qdisc_hash_add(sch, false);
@ -1147,21 +1166,24 @@ err_out4:
goto err_out3;
}
static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
static int qdisc_change(struct Qdisc *sch, struct nlattr **tca,
struct netlink_ext_ack *extack)
{
struct qdisc_size_table *ostab, *stab = NULL;
int err = 0;
if (tca[TCA_OPTIONS]) {
if (!sch->ops->change)
if (!sch->ops->change) {
NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc");
return -EINVAL;
}
err = sch->ops->change(sch, tca[TCA_OPTIONS]);
if (err)
return err;
}
if (tca[TCA_STAB]) {
stab = qdisc_get_stab(tca[TCA_STAB]);
stab = qdisc_get_stab(tca[TCA_STAB], extack);
if (IS_ERR(stab))
return PTR_ERR(stab);
}
@ -1259,8 +1281,10 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
if (clid != TC_H_ROOT) {
if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
p = qdisc_lookup(dev, TC_H_MAJ(clid));
if (!p)
if (!p) {
NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid");
return -ENOENT;
}
q = qdisc_leaf(p, clid);
} else if (dev_ingress_queue(dev)) {
q = dev_ingress_queue(dev)->qdisc_sleeping;
@ -1268,26 +1292,38 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
} else {
q = dev->qdisc;
}
if (!q)
if (!q) {
NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device");
return -ENOENT;
}
if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
if (tcm->tcm_handle && q->handle != tcm->tcm_handle) {
NL_SET_ERR_MSG(extack, "Invalid handle");
return -EINVAL;
}
} else {
q = qdisc_lookup(dev, tcm->tcm_handle);
if (!q)
if (!q) {
NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle");
return -ENOENT;
}
}
if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
NL_SET_ERR_MSG(extack, "Invalid qdisc name");
return -EINVAL;
}
if (n->nlmsg_type == RTM_DELQDISC) {
if (!clid)
if (!clid) {
NL_SET_ERR_MSG(extack, "Classid cannot be zero");
return -EINVAL;
if (q->handle == 0)
}
if (q->handle == 0) {
NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero");
return -ENOENT;
err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
}
err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack);
if (err != 0)
return err;
} else {
@ -1333,8 +1369,10 @@ replay:
if (clid != TC_H_ROOT) {
if (clid != TC_H_INGRESS) {
p = qdisc_lookup(dev, TC_H_MAJ(clid));
if (!p)
if (!p) {
NL_SET_ERR_MSG(extack, "Failed to find specified qdisc");
return -ENOENT;
}
q = qdisc_leaf(p, clid);
} else if (dev_ingress_queue_create(dev)) {
q = dev_ingress_queue(dev)->qdisc_sleeping;
@ -1349,21 +1387,33 @@ replay:
if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
if (tcm->tcm_handle) {
if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) {
NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override");
return -EEXIST;
if (TC_H_MIN(tcm->tcm_handle))
}
if (TC_H_MIN(tcm->tcm_handle)) {
NL_SET_ERR_MSG(extack, "Invalid minor handle");
return -EINVAL;
}
q = qdisc_lookup(dev, tcm->tcm_handle);
if (!q)
if (!q) {
NL_SET_ERR_MSG(extack, "No qdisc found for specified handle");
goto create_n_graft;
if (n->nlmsg_flags & NLM_F_EXCL)
}
if (n->nlmsg_flags & NLM_F_EXCL) {
NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override");
return -EEXIST;
}
if (tca[TCA_KIND] &&
nla_strcmp(tca[TCA_KIND], q->ops->id))
nla_strcmp(tca[TCA_KIND], q->ops->id)) {
NL_SET_ERR_MSG(extack, "Invalid qdisc name");
return -EINVAL;
}
if (q == p ||
(p && check_loop(q, p, 0)))
(p && check_loop(q, p, 0))) {
NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected");
return -ELOOP;
}
qdisc_refcount_inc(q);
goto graft;
} else {
@ -1398,33 +1448,45 @@ replay:
}
}
} else {
if (!tcm->tcm_handle)
if (!tcm->tcm_handle) {
NL_SET_ERR_MSG(extack, "Handle cannot be zero");
return -EINVAL;
}
q = qdisc_lookup(dev, tcm->tcm_handle);
}
/* Change qdisc parameters */
if (!q)
if (!q) {
NL_SET_ERR_MSG(extack, "Specified qdisc not found");
return -ENOENT;
if (n->nlmsg_flags & NLM_F_EXCL)
}
if (n->nlmsg_flags & NLM_F_EXCL) {
NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify");
return -EEXIST;
if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
}
if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
NL_SET_ERR_MSG(extack, "Invalid qdisc name");
return -EINVAL;
err = qdisc_change(q, tca);
}
err = qdisc_change(q, tca, extack);
if (err == 0)
qdisc_notify(net, skb, n, clid, NULL, q);
return err;
create_n_graft:
if (!(n->nlmsg_flags & NLM_F_CREATE))
if (!(n->nlmsg_flags & NLM_F_CREATE)) {
NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag");
return -ENOENT;
}
if (clid == TC_H_INGRESS) {
if (dev_ingress_queue(dev))
if (dev_ingress_queue(dev)) {
q = qdisc_create(dev, dev_ingress_queue(dev), p,
tcm->tcm_parent, tcm->tcm_parent,
tca, &err);
else
tca, &err, extack);
} else {
NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device");
err = -ENOENT;
}
} else {
struct netdev_queue *dev_queue;
@ -1437,7 +1499,7 @@ create_n_graft:
q = qdisc_create(dev, dev_queue, p,
tcm->tcm_parent, tcm->tcm_handle,
tca, &err);
tca, &err, extack);
}
if (q == NULL) {
if (err == -EAGAIN)
@ -1446,7 +1508,7 @@ create_n_graft:
}
graft:
err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack);
if (err) {
if (q)
qdisc_destroy(q);