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net: add extack arg to lwtunnel build state

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Pass extack arg down to lwtunnel_build_state and the build_state callbacks.
Add messages for failures in lwtunnel_build_state, and add the extarg to
nla_parse where possible in the build_state callbacks.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
2017-05-27 16:19:28 -06:00
committed by David S. Miller
parent c255bd681d
commit 9ae2872748
12 changed files with 67 additions and 30 deletions
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20
net/core/lwtunnel.c
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@@ -103,25 +103,39 @@ EXPORT_SYMBOL(lwtunnel_encap_del_ops);
int lwtunnel_build_state(u16 encap_type,
struct nlattr *encap, unsigned int family,
const void *cfg, struct lwtunnel_state **lws)
const void *cfg, struct lwtunnel_state **lws,
struct netlink_ext_ack *extack)
{
const struct lwtunnel_encap_ops *ops;
bool found = false;
int ret = -EINVAL;
if (encap_type == LWTUNNEL_ENCAP_NONE ||
encap_type > LWTUNNEL_ENCAP_MAX)
encap_type > LWTUNNEL_ENCAP_MAX) {
NL_SET_ERR_MSG_ATTR(extack, encap,
"Unknown LWT encapsulation type");
return ret;
}
ret = -EOPNOTSUPP;
rcu_read_lock();
ops = rcu_dereference(lwtun_encaps[encap_type]);
if (likely(ops && ops->build_state && try_module_get(ops->owner))) {
ret = ops->build_state(encap, family, cfg, lws);
found = true;
ret = ops->build_state(encap, family, cfg, lws, extack);
if (ret)
module_put(ops->owner);
}
rcu_read_unlock();
/* don't rely on -EOPNOTSUPP to detect match as build_state
* handlers could return it
*/
if (!found) {
NL_SET_ERR_MSG_ATTR(extack, encap,
"LWT encapsulation type not supported");
}
return ret;
}
EXPORT_SYMBOL(lwtunnel_build_state);