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net: bridge: vlan: add helpers to check for vlan id/range validity

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Add helpers to check if a vlan id or range are valid. The range helper
must be called when range start or end are detected.

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 19:56:07 +02:00 committed by David S. Miller
parent f6310b6107
commit 5a46facbbc
2 changed files with 34 additions and 10 deletions
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13
net/bridge/br_netlink.c
View File

@ -568,17 +568,13 @@ static int br_process_vlan_info(struct net_bridge *br,
bool *changed,
struct netlink_ext_ack *extack)
{
if (!vinfo_curr->vid || vinfo_curr->vid >= VLAN_VID_MASK)
if (!br_vlan_valid_id(vinfo_curr->vid))
return -EINVAL;
if (vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
/* check if we are already processing a range */
if (*vinfo_last)
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last))
return -EINVAL;
*vinfo_last = vinfo_curr;
/* don't allow range of pvids */
if ((*vinfo_last)->flags & BRIDGE_VLAN_INFO_PVID)
return -EINVAL;
return 0;
}
@ -586,10 +582,7 @@ static int br_process_vlan_info(struct net_bridge *br,
struct bridge_vlan_info tmp_vinfo;
int v, err;
if (!(vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_END))
return -EINVAL;
if (vinfo_curr->vid <= (*vinfo_last)->vid)
if (!br_vlan_valid_range(vinfo_curr, *vinfo_last))
return -EINVAL;
memcpy(&tmp_vinfo, *vinfo_last,

31
net/bridge/br_private.h
View File

@ -507,6 +507,37 @@ 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)
{
return vid > 0 && vid < VLAN_VID_MASK;
}
static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
const struct bridge_vlan_info *last)
{
/* 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)))
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)
return false;
else if (cur->vid <= last->vid)
return false;
}
return true;
}
static inline int br_opt_get(const struct net_bridge *br,
enum net_bridge_opts opt)
{