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-rw-r--r--include/linux/rtnetlink.h14
-rw-r--r--net/core/rtnetlink.c16
2 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 61278584853..6731e7f4cc0 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -570,6 +570,8 @@ static __inline__ int rtattr_strcmp(const struct rtattr *rta, const char *str)
}
extern int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len);
+extern int rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr,
+ struct rtattr *rta, void **data, int len);
#define rtattr_parse_nested(tb, max, rta) \
rtattr_parse((tb), (max), RTA_DATA((rta)), RTA_PAYLOAD((rta)))
@@ -638,6 +640,18 @@ extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const voi
({ (start)->rta_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
(skb)->len; })
+#define RTA_NEST_COMPAT(skb, type, attrlen, data) \
+({ struct rtattr *__start = (struct rtattr *)skb_tail_pointer(skb); \
+ RTA_PUT(skb, type, attrlen, data); \
+ RTA_NEST(skb, type); \
+ __start; })
+
+#define RTA_NEST_COMPAT_END(skb, start) \
+({ struct rtattr *__nest = (void *)(start) + NLMSG_ALIGN((start)->rta_len); \
+ (start)->rta_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
+ RTA_NEST_END(skb, __nest); \
+ (skb)->len; })
+
#define RTA_NEST_CANCEL(skb, start) \
({ if (start) \
skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 06c0c5afabf..c25d23ba6d5 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -97,6 +97,21 @@ int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
return 0;
}
+int rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr,
+ struct rtattr *rta, void **data, int len)
+{
+ if (RTA_PAYLOAD(rta) < len)
+ return -1;
+ *data = RTA_DATA(rta);
+
+ if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
+ rta = RTA_DATA(rta) + RTA_ALIGN(len);
+ return rtattr_parse_nested(tb, maxattr, rta);
+ }
+ memset(tb, 0, sizeof(struct rtattr *) * maxattr);
+ return 0;
+}
+
static struct rtnl_link *rtnl_msg_handlers[NPROTO];
static inline int rtm_msgindex(int msgtype)
@@ -1297,6 +1312,7 @@ void __init rtnetlink_init(void)
EXPORT_SYMBOL(__rta_fill);
EXPORT_SYMBOL(rtattr_strlcpy);
EXPORT_SYMBOL(rtattr_parse);
+EXPORT_SYMBOL(rtattr_parse_nested_compat);
EXPORT_SYMBOL(rtnetlink_put_metrics);
EXPORT_SYMBOL(rtnl_lock);
EXPORT_SYMBOL(rtnl_trylock);