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net: neighbor: add fdb extended attribute

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Add an attribute to NDA which will contain all future fdb-specific
attributes in order to avoid polluting the NDA namespace with e.g.
bridge or vxlan specific attributes. The attribute is called
NDA_FDB_EXT_ATTRS and the structure would look like:
 [NDA_FDB_EXT_ATTRS] = {
    [NFEA_xxx]
 }

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2020-06-23 23:47:16 +03:00 committed by David S. Miller
parent 0592ff8834
commit 899426b3bd
2 changed files with 13 additions and 0 deletions
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12
include/uapi/linux/neighbour.h
View File

@ -30,6 +30,7 @@ enum {
NDA_SRC_VNI, NDA_SRC_VNI,
NDA_PROTOCOL, /* Originator of entry */ NDA_PROTOCOL, /* Originator of entry */
NDA_NH_ID, NDA_NH_ID,
NDA_FDB_EXT_ATTRS,
__NDA_MAX __NDA_MAX
}; };
@ -172,4 +173,15 @@ enum {
}; };
#define NDTA_MAX (__NDTA_MAX - 1) #define NDTA_MAX (__NDTA_MAX - 1)
/* embedded into NDA_FDB_EXT_ATTRS:
* [NDA_FDB_EXT_ATTRS] = {
* ...
* }
*/
enum {
NFEA_UNSPEC,
__NFEA_MAX
};
#define NFEA_MAX (__NFEA_MAX - 1)
#endif #endif

1
net/core/neighbour.c
View File

@ -1783,6 +1783,7 @@ const struct nla_policy nda_policy[NDA_MAX+1] = {
[NDA_MASTER] = { .type = NLA_U32 }, [NDA_MASTER] = { .type = NLA_U32 },
[NDA_PROTOCOL] = { .type = NLA_U8 }, [NDA_PROTOCOL] = { .type = NLA_U8 },
[NDA_NH_ID] = { .type = NLA_U32 }, [NDA_NH_ID] = { .type = NLA_U32 },
[NDA_FDB_EXT_ATTRS] = { .type = NLA_NESTED },
}; };
static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh,