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net: bridge: netlink: add extack error messages when processing vlans

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Add extack messages on vlan processing errors. We need to move the flags
missing check after the "last" check since we may have "last" set but
lack a range end flag in the next entry.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2020-01-14 19:56:08 +02:00 committed by David S. Miller
parent 5a46facbbc
commit 8f4cc940a1
2 changed files with 30 additions and 14 deletions
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6
net/bridge/br_netlink.c
View File

@ -568,11 +568,11 @@ static int br_process_vlan_info(struct net_bridge *br,
bool *changed,
struct netlink_ext_ack *extack)
{
if (!br_vlan_valid_id(vinfo_curr->vid))
if (!br_vlan_valid_id(vinfo_curr->vid, extack))
return -EINVAL;
if (vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last))
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
return -EINVAL;
*vinfo_last = vinfo_curr;
return 0;
@ -582,7 +582,7 @@ static int br_process_vlan_info(struct net_bridge *br,
struct bridge_vlan_info tmp_vinfo;
int v, err;
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last))
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack))
return -EINVAL;
memcpy(&tmp_vinfo, *vinfo_last,

38
net/bridge/br_private.h
View File

@ -507,32 +507,48 @@ static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
}
static inline bool br_vlan_valid_id(u16 vid)
static inline bool br_vlan_valid_id(u16 vid, struct netlink_ext_ack *extack)
{
return vid > 0 && vid < VLAN_VID_MASK;
bool ret = vid > 0 && vid < VLAN_VID_MASK;
if (!ret)
NL_SET_ERR_MSG_MOD(extack, "Vlan id is invalid");
return ret;
}
static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
const struct bridge_vlan_info *last)
const struct bridge_vlan_info *last,
struct netlink_ext_ack *extack)
{
/* pvid flag is not allowed in ranges */
if (cur->flags & BRIDGE_VLAN_INFO_PVID)
return false;
/* check for required range flags */
if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
BRIDGE_VLAN_INFO_RANGE_END)))
if (cur->flags & BRIDGE_VLAN_INFO_PVID) {
NL_SET_ERR_MSG_MOD(extack, "Pvid isn't allowed in a range");
return false;
}
/* when cur is the range end, check if:
* - it has range start flag
* - range ids are invalid (end is equal to or before start)
*/
if (last) {
if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN)
if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
NL_SET_ERR_MSG_MOD(extack, "Found a new vlan range start while processing one");
return false;
else if (cur->vid <= last->vid)
} else if (!(cur->flags & BRIDGE_VLAN_INFO_RANGE_END)) {
NL_SET_ERR_MSG_MOD(extack, "Vlan range end flag is missing");
return false;
} else if (cur->vid <= last->vid) {
NL_SET_ERR_MSG_MOD(extack, "End vlan id is less than or equal to start vlan id");
return false;
}
}
/* check for required range flags */
if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
BRIDGE_VLAN_INFO_RANGE_END))) {
NL_SET_ERR_MSG_MOD(extack, "Both vlan range flags are missing");
return false;
}
return true;