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| author | Simon Horman <horms@kernel.org> | 2023-05-11 18:07:12 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-05-12 11:36:16 +0300 |
| commit | c1bc7d73c96425db12bb92fbf24c37fd1c9ac329 (patch) | |
| tree | 3f9ca72c281c7d2493737589f84b6ed80802da36 /drivers/net/bonding | |
| parent | deb2e484baf90ed776626894ea7ee5db7fbe839b (diff) | |
| download | linux-c1bc7d73c96425db12bb92fbf24c37fd1c9ac329.tar.xz | |
bonding: Always assign be16 value to vlan_proto
The type of the vlan_proto field is __be16.
And most users of the field use it as such.
In the case of setting or testing the field for the special VLAN_N_VID
value, host byte order is used. Which seems incorrect.
It also seems somewhat odd to store a VLAN ID value in a field that is
otherwise used to store Ether types.
Address this issue by defining BOND_VLAN_PROTO_NONE, a big endian value.
0xffff was chosen somewhat arbitrarily. What is important is that it
doesn't overlap with any valid VLAN Ether types.
I don't believe the problems described above are a bug because
VLAN_N_VID in both little-endian and big-endian byte order does not
conflict with any supported VLAN Ether types in big-endian byte order.
Reported by sparse as:
.../bond_main.c:2857:26: warning: restricted __be16 degrades to integer
.../bond_main.c:2863:20: warning: restricted __be16 degrades to integer
.../bond_main.c:2939:40: warning: incorrect type in assignment (different base types)
.../bond_main.c:2939:40: expected restricted __be16 [usertype] vlan_proto
.../bond_main.c:2939:40: got int
No functional changes intended.
Compile tested only.
Signed-off-by: Simon Horman <horms@kernel.org>
Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bonding')
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 3fed888629f7..ebf61c19dcef 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2871,6 +2871,8 @@ static bool bond_has_this_ip(struct bonding *bond, __be32 ip) return ret; } +#define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff) + static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, struct sk_buff *skb) { @@ -2878,13 +2880,13 @@ static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, struct net_device *slave_dev = slave->dev; struct bond_vlan_tag *outer_tag = tags; - if (!tags || tags->vlan_proto == VLAN_N_VID) + if (!tags || tags->vlan_proto == BOND_VLAN_PROTO_NONE) return true; tags++; /* Go through all the tags backwards and add them to the packet */ - while (tags->vlan_proto != VLAN_N_VID) { + while (tags->vlan_proto != BOND_VLAN_PROTO_NONE) { if (!tags->vlan_id) { tags++; continue; @@ -2960,7 +2962,7 @@ struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); if (!tags) return ERR_PTR(-ENOMEM); - tags[level].vlan_proto = VLAN_N_VID; + tags[level].vlan_proto = BOND_VLAN_PROTO_NONE; return tags; } |