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[NETLINK]: attr: add nested compat attribute type

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Add a nested compat attribute type that can be used to convert
attributes that contain a structure to nested attributes in a
backwards compatible way.

Signed-off-by: Patrick McHardy <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Patrick McHardy 2007-06-25 13:49:35 -07:00 • committed by David S. Miller
commit 1092cb2197
2 changed files with 95 additions and 0 deletions
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11
net/netlink/attr.c
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@ -72,6 +72,17 @@ static int validate_nla(struct nlattr *nla, int maxtype,
return -ERANGE;
break;
case NLA_NESTED_COMPAT:
if (attrlen < pt->len)
return -ERANGE;
if (attrlen < NLA_ALIGN(pt->len))
break;
if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN)
return -ERANGE;
nla = nla_data(nla) + NLA_ALIGN(pt->len);
if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN + nla_len(nla))
return -ERANGE;
break;
default:
if (pt->len)
minlen = pt->len;