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authorDaniel Borkmann <daniel@iogearbox.net>2017-02-17 03:56:11 +0300
committerDavid S. Miller <davem@davemloft.net>2017-02-17 22:56:11 +0300
commit025331df34f6722f86b467cb13a69326444ab1bc (patch)
tree30471bb6e7f42f3ffe8ce21af74ee3ea80aab88e /net
parent99f18f1d2f447afe575c1ad2641050c77d244760 (diff)
downloadlinux-025331df34f6722f86b467cb13a69326444ab1bc.tar.xz
rtnl: don't account unused struct ifla_port_vsi in rtnl_port_size
When allocating rtnl dump messages, struct ifla_port_vsi is never dumped, so we can save header plus payload in rtnl_port_size(). Infact, attribute IFLA_PORT_VSI_TYPE and struct ifla_port_vsi are not used anywhere in the kernel. We only need to keep the nla policy should applications in user space be filling this out. Same NLA_BINARY issue exists as was fixed in 364d5716a7ad ("rtnetlink: ifla_vf_policy: fix misuses of NLA_BINARY") and others, but then again IFLA_PORT_VSI_TYPE is not used anywhere, so just add a comment that it's unused. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/rtnetlink.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index adfb54b896da..e3286d32eca5 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -876,8 +876,6 @@ static size_t rtnl_port_size(const struct net_device *dev,
{
size_t port_size = nla_total_size(4) /* PORT_VF */
+ nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
- + nla_total_size(sizeof(struct ifla_port_vsi))
- /* PORT_VSI_TYPE */
+ nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
+ nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
+ nla_total_size(1) /* PROT_VDP_REQUEST */
@@ -1491,14 +1489,19 @@ static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
[IFLA_PORT_VF] = { .type = NLA_U32 },
[IFLA_PORT_PROFILE] = { .type = NLA_STRING,
.len = PORT_PROFILE_MAX },
- [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
- .len = sizeof(struct ifla_port_vsi)},
[IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
.len = PORT_UUID_MAX },
[IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
.len = PORT_UUID_MAX },
[IFLA_PORT_REQUEST] = { .type = NLA_U8, },
[IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
+
+ /* Unused, but we need to keep it here since user space could
+ * fill it. It's also broken with regard to NLA_BINARY use in
+ * combination with structs.
+ */
+ [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
+ .len = sizeof(struct ifla_port_vsi) },
};
static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {