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taprio: validate TCA_TAPRIO_ATTR_FLAGS through policy instead of open-coding 

As of now, the field TCA_TAPRIO_ATTR_FLAGS is being validated by manually
checking its value, using the function taprio_flags_valid().

With this patch, the field will be validated through the netlink policy
NLA_POLICY_MASK, where the mask is defined by TAPRIO_SUPPORTED_FLAGS.
The mutual exclusivity of the two flags TCA_TAPRIO_ATTR_FLAG_FULL_OFFLOAD
and TCA_TAPRIO_ATTR_FLAG_TXTIME_ASSIST is still checked manually.

Changes since RFC:
- fixed reversed xmas tree
- use NL_SET_ERR_MSG_MOD() for both invalid configuration

Changes since v1:
- Changed NL_SET_ERR_MSG_MOD to NL_SET_ERR_MSG_ATTR when wrong flags
  issued
- Changed __u32 to u32

Changes since v2:
- Added the missing parameter for NL_SET_ERR_MSG_ATTR (sorry again for
  the noise)

Signed-off-by: Alessandro Marcolini <alessandromarcolini99@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alessandro Marcolini 2024-01-25 17:59:42 +01:00 committed by David S. Miller
parent c57e32fb29
commit 0efc7e541f
1 changed files with 26 additions and 46 deletions
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72
net/sched/sch_taprio.c
View File

@ -40,6 +40,8 @@ static struct static_key_false taprio_have_working_mqprio;
#define TXTIME_ASSIST_IS_ENABLED(flags) ((flags) & TCA_TAPRIO_ATTR_FLAG_TXTIME_ASSIST)
#define FULL_OFFLOAD_IS_ENABLED(flags) ((flags) & TCA_TAPRIO_ATTR_FLAG_FULL_OFFLOAD)
#define TAPRIO_SUPPORTED_FLAGS \
(TCA_TAPRIO_ATTR_FLAG_TXTIME_ASSIST | TCA_TAPRIO_ATTR_FLAG_FULL_OFFLOAD)
#define TAPRIO_FLAGS_INVALID U32_MAX
struct sched_entry {
@ -408,19 +410,6 @@ static bool is_valid_interval(struct sk_buff *skb, struct Qdisc *sch)
return entry;
}
static bool taprio_flags_valid(u32 flags)
{
/* Make sure no other flag bits are set. */
if (flags & ~(TCA_TAPRIO_ATTR_FLAG_TXTIME_ASSIST |
TCA_TAPRIO_ATTR_FLAG_FULL_OFFLOAD))
return false;
/* txtime-assist and full offload are mutually exclusive */
if ((flags & TCA_TAPRIO_ATTR_FLAG_TXTIME_ASSIST) &&
(flags & TCA_TAPRIO_ATTR_FLAG_FULL_OFFLOAD))
return false;
return true;
}
/* This returns the tstamp value set by TCP in terms of the set clock. */
static ktime_t get_tcp_tstamp(struct taprio_sched *q, struct sk_buff *skb)
{
@ -1031,7 +1020,8 @@ static const struct nla_policy taprio_policy[TCA_TAPRIO_ATTR_MAX + 1] = {
[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME] =
NLA_POLICY_FULL_RANGE_SIGNED(NLA_S64, &taprio_cycle_time_range),
[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION] = { .type = NLA_S64 },
[TCA_TAPRIO_ATTR_FLAGS] = { .type = NLA_U32 },
[TCA_TAPRIO_ATTR_FLAGS] =
NLA_POLICY_MASK(NLA_U32, TAPRIO_SUPPORTED_FLAGS),
[TCA_TAPRIO_ATTR_TXTIME_DELAY] = { .type = NLA_U32 },
[TCA_TAPRIO_ATTR_TC_ENTRY] = { .type = NLA_NESTED },
};
@ -1815,33 +1805,6 @@ static int taprio_mqprio_cmp(const struct net_device *dev,
return 0;
}
/* The semantics of the 'flags' argument in relation to 'change()'
* requests, are interpreted following two rules (which are applied in
* this order): (1) an omitted 'flags' argument is interpreted as
* zero; (2) the 'flags' of a "running" taprio instance cannot be
* changed.
*/
static int taprio_new_flags(const struct nlattr *attr, u32 old,
struct netlink_ext_ack *extack)
{
u32 new = 0;
if (attr)
new = nla_get_u32(attr);
if (old != TAPRIO_FLAGS_INVALID && old != new) {
NL_SET_ERR_MSG_MOD(extack, "Changing 'flags' of a running schedule is not supported");
return -EOPNOTSUPP;
}
if (!taprio_flags_valid(new)) {
NL_SET_ERR_MSG_MOD(extack, "Specified 'flags' are not valid");
return -EINVAL;
}
return new;
}
static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
struct netlink_ext_ack *extack)
{
@ -1852,6 +1815,7 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
struct net_device *dev = qdisc_dev(sch);
struct tc_mqprio_qopt *mqprio = NULL;
unsigned long flags;
u32 taprio_flags;
ktime_t start;
int i, err;
@ -1863,12 +1827,28 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
if (tb[TCA_TAPRIO_ATTR_PRIOMAP])
mqprio = nla_data(tb[TCA_TAPRIO_ATTR_PRIOMAP]);
err = taprio_new_flags(tb[TCA_TAPRIO_ATTR_FLAGS],
q->flags, extack);
if (err < 0)
return err;
/* The semantics of the 'flags' argument in relation to 'change()'
* requests, are interpreted following two rules (which are applied in
* this order): (1) an omitted 'flags' argument is interpreted as
* zero; (2) the 'flags' of a "running" taprio instance cannot be
* changed.
*/
taprio_flags = tb[TCA_TAPRIO_ATTR_FLAGS] ? nla_get_u32(tb[TCA_TAPRIO_ATTR_FLAGS]) : 0;
q->flags = err;
/* txtime-assist and full offload are mutually exclusive */
if ((taprio_flags & TCA_TAPRIO_ATTR_FLAG_TXTIME_ASSIST) &&
(taprio_flags & TCA_TAPRIO_ATTR_FLAG_FULL_OFFLOAD)) {
NL_SET_ERR_MSG_ATTR(extack, tb[TCA_TAPRIO_ATTR_FLAGS],
"TXTIME_ASSIST and FULL_OFFLOAD are mutually exclusive");
return -EINVAL;
}
if (q->flags != TAPRIO_FLAGS_INVALID && q->flags != taprio_flags) {
NL_SET_ERR_MSG_MOD(extack,
"Changing 'flags' of a running schedule is not supported");
return -EOPNOTSUPP;
}
q->flags = taprio_flags;
err = taprio_parse_mqprio_opt(dev, mqprio, extack, q->flags);
if (err < 0)