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net: sched: copy tunnel info when setting flow_action entry->tunnel 

In order to remove dependency on rtnl lock, modify tc_setup_flow_action()
to copy tunnel info, instead of just saving pointer to tunnel_key action
tunnel info. This is necessary to prevent concurrent action overwrite from
releasing tunnel info while it is being used by rtnl-unlocked driver.

Implement helper tcf_tunnel_info_copy() that is used to copy tunnel info
with all its options to dynamically allocated memory block. Modify
tc_cleanup_flow_action() to free dynamically allocated tunnel info.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2019-08-26 16:45:05 +03:00 committed by David S. Miller
parent 5a6ff4b13d
commit 1444c175a3
2 changed files with 25 additions and 1 deletions
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17
include/net/tc_act/tc_tunnel_key.h
View File

@ -59,4 +59,21 @@ static inline struct ip_tunnel_info *tcf_tunnel_info(const struct tc_action *a)
return NULL;
#endif
}
static inline struct ip_tunnel_info *
tcf_tunnel_info_copy(const struct tc_action *a)
{
#ifdef CONFIG_NET_CLS_ACT
struct ip_tunnel_info *tun = tcf_tunnel_info(a);
if (tun) {
size_t tun_size = sizeof(*tun) + tun->options_len;
struct ip_tunnel_info *tun_copy = kmemdup(tun, tun_size,
GFP_KERNEL);
return tun_copy;
}
#endif
return NULL;
}
#endif /* __NET_TC_TUNNEL_KEY_H */

9
net/sched/cls_api.c
View File

@ -3279,6 +3279,9 @@ void tc_cleanup_flow_action(struct flow_action *flow_action)
if (entry->dev)
dev_put(entry->dev);
break;
case FLOW_ACTION_TUNNEL_ENCAP:
kfree(entry->tunnel);
break;
default:
break;
}
@ -3355,7 +3358,11 @@ int tc_setup_flow_action(struct flow_action *flow_action,
}
} else if (is_tcf_tunnel_set(act)) {
entry->id = FLOW_ACTION_TUNNEL_ENCAP;
entry->tunnel = tcf_tunnel_info(act);
entry->tunnel = tcf_tunnel_info_copy(act);
if (!entry->tunnel) {
err = -ENOMEM;
goto err_out;
}
} else if (is_tcf_tunnel_release(act)) {
entry->id = FLOW_ACTION_TUNNEL_DECAP;
} else if (is_tcf_pedit(act)) {