[PATCH 5.4 36/78] tipc: add extack messages for bearer/media failure

From: Greg Kroah-Hartman
Date: Tue Jun 08 2021 - 14:52:08 EST


From: Hoang Le <hoang.h.le@xxxxxxxxxxxxxx>

[ Upstream commit b83e214b2e04204f1fc674574362061492c37245 ]

Add extack error messages for -EINVAL errors when enabling bearer,
getting/setting properties for a media/bearer

Acked-by: Jon Maloy <jmaloy@xxxxxxxxxx>
Signed-off-by: Hoang Le <hoang.h.le@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/tipc/bearer.c | 50 +++++++++++++++++++++++++++++++++++++----------
1 file changed, 40 insertions(+), 10 deletions(-)

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 0214aa1c4427..0e0161597749 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -233,7 +233,8 @@ void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
*/
static int tipc_enable_bearer(struct net *net, const char *name,
u32 disc_domain, u32 prio,
- struct nlattr *attr[])
+ struct nlattr *attr[],
+ struct netlink_ext_ack *extack)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_bearer_names b_names;
@@ -247,17 +248,20 @@ static int tipc_enable_bearer(struct net *net, const char *name,

if (!bearer_name_validate(name, &b_names)) {
errstr = "illegal name";
+ NL_SET_ERR_MSG(extack, "Illegal name");
goto rejected;
}

if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
errstr = "illegal priority";
+ NL_SET_ERR_MSG(extack, "Illegal priority");
goto rejected;
}

m = tipc_media_find(b_names.media_name);
if (!m) {
errstr = "media not registered";
+ NL_SET_ERR_MSG(extack, "Media not registered");
goto rejected;
}

@@ -271,6 +275,7 @@ static int tipc_enable_bearer(struct net *net, const char *name,
break;
if (!strcmp(name, b->name)) {
errstr = "already enabled";
+ NL_SET_ERR_MSG(extack, "Already enabled");
goto rejected;
}
bearer_id++;
@@ -282,6 +287,7 @@ static int tipc_enable_bearer(struct net *net, const char *name,
name, prio);
if (prio == TIPC_MIN_LINK_PRI) {
errstr = "cannot adjust to lower";
+ NL_SET_ERR_MSG(extack, "Cannot adjust to lower");
goto rejected;
}
pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
@@ -292,6 +298,7 @@ static int tipc_enable_bearer(struct net *net, const char *name,

if (bearer_id >= MAX_BEARERS) {
errstr = "max 3 bearers permitted";
+ NL_SET_ERR_MSG(extack, "Max 3 bearers permitted");
goto rejected;
}

@@ -305,6 +312,7 @@ static int tipc_enable_bearer(struct net *net, const char *name,
if (res) {
kfree(b);
errstr = "failed to enable media";
+ NL_SET_ERR_MSG(extack, "Failed to enable media");
goto rejected;
}

@@ -320,6 +328,7 @@ static int tipc_enable_bearer(struct net *net, const char *name,
if (res) {
bearer_disable(net, b);
errstr = "failed to create discoverer";
+ NL_SET_ERR_MSG(extack, "Failed to create discoverer");
goto rejected;
}

@@ -862,6 +871,7 @@ int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
bearer = tipc_bearer_find(net, name);
if (!bearer) {
err = -EINVAL;
+ NL_SET_ERR_MSG(info->extack, "Bearer not found");
goto err_out;
}

@@ -901,8 +911,10 @@ int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);

bearer = tipc_bearer_find(net, name);
- if (!bearer)
+ if (!bearer) {
+ NL_SET_ERR_MSG(info->extack, "Bearer not found");
return -EINVAL;
+ }

bearer_disable(net, bearer);

@@ -960,7 +972,8 @@ int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
}

- return tipc_enable_bearer(net, bearer, domain, prio, attrs);
+ return tipc_enable_bearer(net, bearer, domain, prio, attrs,
+ info->extack);
}

int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
@@ -999,6 +1012,7 @@ int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
b = tipc_bearer_find(net, name);
if (!b) {
rtnl_unlock();
+ NL_SET_ERR_MSG(info->extack, "Bearer not found");
return -EINVAL;
}

@@ -1039,8 +1053,10 @@ int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);

b = tipc_bearer_find(net, name);
- if (!b)
+ if (!b) {
+ NL_SET_ERR_MSG(info->extack, "Bearer not found");
return -EINVAL;
+ }

if (attrs[TIPC_NLA_BEARER_PROP]) {
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
@@ -1059,12 +1075,18 @@ int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
if (props[TIPC_NLA_PROP_WIN])
b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
if (props[TIPC_NLA_PROP_MTU]) {
- if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
+ if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
+ NL_SET_ERR_MSG(info->extack,
+ "MTU property is unsupported");
return -EINVAL;
+ }
#ifdef CONFIG_TIPC_MEDIA_UDP
if (tipc_udp_mtu_bad(nla_get_u32
- (props[TIPC_NLA_PROP_MTU])))
+ (props[TIPC_NLA_PROP_MTU]))) {
+ NL_SET_ERR_MSG(info->extack,
+ "MTU value is out-of-range");
return -EINVAL;
+ }
b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
#endif
@@ -1192,6 +1214,7 @@ int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
rtnl_lock();
media = tipc_media_find(name);
if (!media) {
+ NL_SET_ERR_MSG(info->extack, "Media not found");
err = -EINVAL;
goto err_out;
}
@@ -1228,9 +1251,10 @@ int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);

m = tipc_media_find(name);
- if (!m)
+ if (!m) {
+ NL_SET_ERR_MSG(info->extack, "Media not found");
return -EINVAL;
-
+ }
if (attrs[TIPC_NLA_MEDIA_PROP]) {
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];

@@ -1246,12 +1270,18 @@ int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
if (props[TIPC_NLA_PROP_WIN])
m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
if (props[TIPC_NLA_PROP_MTU]) {
- if (m->type_id != TIPC_MEDIA_TYPE_UDP)
+ if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
+ NL_SET_ERR_MSG(info->extack,
+ "MTU property is unsupported");
return -EINVAL;
+ }
#ifdef CONFIG_TIPC_MEDIA_UDP
if (tipc_udp_mtu_bad(nla_get_u32
- (props[TIPC_NLA_PROP_MTU])))
+ (props[TIPC_NLA_PROP_MTU]))) {
+ NL_SET_ERR_MSG(info->extack,
+ "MTU value is out-of-range");
return -EINVAL;
+ }
m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
#endif
}
--
2.30.2