Commit b64ee485 authored by David S. Miller's avatar David S. Miller

Merge branch 'act_gate-fixes'

Davide Caratti says:

====================
two fixes for 'act_gate' control plane

- patch 1/2 attempts to fix the error path of tcf_gate_init() when users
  try to configure 'act_gate' rules with wrong parameters
- patch 2/2 is a follow-up of a recent fix for NULL dereference in
  the error path of tcf_gate_init()

further work will introduce a tdc test for 'act_gate'.

changes since v2:
  - fix undefined behavior in patch 1/2
  - improve comment in patch 2/2
changes since v1:
  coding style fixes in patch 1/2 and 2/2
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents ba61539c c362a06e
......@@ -32,7 +32,7 @@ static ktime_t gate_get_time(struct tcf_gate *gact)
return KTIME_MAX;
}
static int gate_get_start_time(struct tcf_gate *gact, ktime_t *start)
static void gate_get_start_time(struct tcf_gate *gact, ktime_t *start)
{
struct tcf_gate_params *param = &gact->param;
ktime_t now, base, cycle;
......@@ -43,18 +43,13 @@ static int gate_get_start_time(struct tcf_gate *gact, ktime_t *start)
if (ktime_after(base, now)) {
*start = base;
return 0;
return;
}
cycle = param->tcfg_cycletime;
/* cycle time should not be zero */
if (!cycle)
return -EFAULT;
n = div64_u64(ktime_sub_ns(now, base), cycle);
*start = ktime_add_ns(base, (n + 1) * cycle);
return 0;
}
static void gate_start_timer(struct tcf_gate *gact, ktime_t start)
......@@ -277,6 +272,27 @@ static int parse_gate_list(struct nlattr *list_attr,
return err;
}
static void gate_setup_timer(struct tcf_gate *gact, u64 basetime,
enum tk_offsets tko, s32 clockid,
bool do_init)
{
if (!do_init) {
if (basetime == gact->param.tcfg_basetime &&
tko == gact->tk_offset &&
clockid == gact->param.tcfg_clockid)
return;
spin_unlock_bh(&gact->tcf_lock);
hrtimer_cancel(&gact->hitimer);
spin_lock_bh(&gact->tcf_lock);
}
gact->param.tcfg_basetime = basetime;
gact->param.tcfg_clockid = clockid;
gact->tk_offset = tko;
hrtimer_init(&gact->hitimer, clockid, HRTIMER_MODE_ABS_SOFT);
gact->hitimer.function = gate_timer_func;
}
static int tcf_gate_init(struct net *net, struct nlattr *nla,
struct nlattr *est, struct tc_action **a,
int ovr, int bind, bool rtnl_held,
......@@ -287,12 +303,12 @@ static int tcf_gate_init(struct net *net, struct nlattr *nla,
enum tk_offsets tk_offset = TK_OFFS_TAI;
struct nlattr *tb[TCA_GATE_MAX + 1];
struct tcf_chain *goto_ch = NULL;
u64 cycletime = 0, basetime = 0;
struct tcf_gate_params *p;
s32 clockid = CLOCK_TAI;
struct tcf_gate *gact;
struct tc_gate *parm;
int ret = 0, err;
u64 basetime = 0;
u32 gflags = 0;
s32 prio = -1;
ktime_t start;
......@@ -308,6 +324,27 @@ static int tcf_gate_init(struct net *net, struct nlattr *nla,
if (!tb[TCA_GATE_PARMS])
return -EINVAL;
if (tb[TCA_GATE_CLOCKID]) {
clockid = nla_get_s32(tb[TCA_GATE_CLOCKID]);
switch (clockid) {
case CLOCK_REALTIME:
tk_offset = TK_OFFS_REAL;
break;
case CLOCK_MONOTONIC:
tk_offset = TK_OFFS_MAX;
break;
case CLOCK_BOOTTIME:
tk_offset = TK_OFFS_BOOT;
break;
case CLOCK_TAI:
tk_offset = TK_OFFS_TAI;
break;
default:
NL_SET_ERR_MSG(extack, "Invalid 'clockid'");
return -EINVAL;
}
}
parm = nla_data(tb[TCA_GATE_PARMS]);
index = parm->index;
......@@ -331,10 +368,6 @@ static int tcf_gate_init(struct net *net, struct nlattr *nla,
tcf_idr_release(*a, bind);
return -EEXIST;
}
if (ret == ACT_P_CREATED) {
to_gate(*a)->param.tcfg_clockid = -1;
INIT_LIST_HEAD(&(to_gate(*a)->param.entries));
}
if (tb[TCA_GATE_PRIORITY])
prio = nla_get_s32(tb[TCA_GATE_PRIORITY]);
......@@ -345,41 +378,19 @@ static int tcf_gate_init(struct net *net, struct nlattr *nla,
if (tb[TCA_GATE_FLAGS])
gflags = nla_get_u32(tb[TCA_GATE_FLAGS]);
if (tb[TCA_GATE_CLOCKID]) {
clockid = nla_get_s32(tb[TCA_GATE_CLOCKID]);
switch (clockid) {
case CLOCK_REALTIME:
tk_offset = TK_OFFS_REAL;
break;
case CLOCK_MONOTONIC:
tk_offset = TK_OFFS_MAX;
break;
case CLOCK_BOOTTIME:
tk_offset = TK_OFFS_BOOT;
break;
case CLOCK_TAI:
tk_offset = TK_OFFS_TAI;
break;
default:
NL_SET_ERR_MSG(extack, "Invalid 'clockid'");
goto release_idr;
}
}
gact = to_gate(*a);
if (ret == ACT_P_CREATED)
INIT_LIST_HEAD(&gact->param.entries);
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
if (err < 0)
goto release_idr;
gact = to_gate(*a);
spin_lock_bh(&gact->tcf_lock);
p = &gact->param;
if (tb[TCA_GATE_CYCLE_TIME]) {
p->tcfg_cycletime = nla_get_u64(tb[TCA_GATE_CYCLE_TIME]);
if (!p->tcfg_cycletime_ext)
goto chain_put;
}
if (tb[TCA_GATE_CYCLE_TIME])
cycletime = nla_get_u64(tb[TCA_GATE_CYCLE_TIME]);
if (tb[TCA_GATE_ENTRY_LIST]) {
err = parse_gate_list(tb[TCA_GATE_ENTRY_LIST], p, extack);
......@@ -387,35 +398,29 @@ static int tcf_gate_init(struct net *net, struct nlattr *nla,
goto chain_put;
}
if (!p->tcfg_cycletime) {
if (!cycletime) {
struct tcfg_gate_entry *entry;
ktime_t cycle = 0;
list_for_each_entry(entry, &p->entries, list)
cycle = ktime_add_ns(cycle, entry->interval);
p->tcfg_cycletime = cycle;
cycletime = cycle;
if (!cycletime) {
err = -EINVAL;
goto chain_put;
}
}
p->tcfg_cycletime = cycletime;
if (tb[TCA_GATE_CYCLE_TIME_EXT])
p->tcfg_cycletime_ext =
nla_get_u64(tb[TCA_GATE_CYCLE_TIME_EXT]);
gate_setup_timer(gact, basetime, tk_offset, clockid,
ret == ACT_P_CREATED);
p->tcfg_priority = prio;
p->tcfg_basetime = basetime;
p->tcfg_clockid = clockid;
p->tcfg_flags = gflags;
gact->tk_offset = tk_offset;
hrtimer_init(&gact->hitimer, clockid, HRTIMER_MODE_ABS_SOFT);
gact->hitimer.function = gate_timer_func;
err = gate_get_start_time(gact, &start);
if (err < 0) {
NL_SET_ERR_MSG(extack,
"Internal error: failed get start time");
release_entry_list(&p->entries);
goto chain_put;
}
gate_get_start_time(gact, &start);
gact->current_close_time = start;
gact->current_gate_status = GATE_ACT_GATE_OPEN | GATE_ACT_PENDING;
......@@ -443,6 +448,13 @@ static int tcf_gate_init(struct net *net, struct nlattr *nla,
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
release_idr:
/* action is not inserted in any list: it's safe to init hitimer
* without taking tcf_lock.
*/
if (ret == ACT_P_CREATED)
gate_setup_timer(gact, gact->param.tcfg_basetime,
gact->tk_offset, gact->param.tcfg_clockid,
true);
tcf_idr_release(*a, bind);
return err;
}
......@@ -453,9 +465,7 @@ static void tcf_gate_cleanup(struct tc_action *a)
struct tcf_gate_params *p;
p = &gact->param;
if (p->tcfg_clockid != -1)
hrtimer_cancel(&gact->hitimer);
release_entry_list(&p->entries);
}
......
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