Adds rtnl_notify() to send rtnetlink notification messages and
rtnl_set_sk_err() to report notification errors as socket
errors in order to indicate the need of a resync due to loss
of events.
nlmsg_report() is added to properly document the meaning of
NLM_F_ECHO.
Signed-off-by: Thomas Graf <[EMAIL PROTECTED]>
Index: net-2.6.19.git/net/core/rtnetlink.c
===================================================================
--- net-2.6.19.git.orig/net/core/rtnetlink.c
+++ net-2.6.19.git/net/core/rtnetlink.c
@@ -171,6 +171,22 @@ int rtnl_unicast(struct sk_buff *skb, u3
return nlmsg_unicast(rtnl, skb, pid);
}
+int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
+ struct nlmsghdr *nlh, gfp_t flags)
+{
+ int report = 0;
+
+ if (nlh)
+ report = nlmsg_report(nlh);
+
+ return nlmsg_notify(rtnl, skb, pid, group, report, flags);
+}
+
+void rtnl_set_sk_err(u32 group, int error)
+{
+ netlink_set_err(rtnl, 0, group, error);
+}
+
int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
{
struct rtattr *mx = (struct rtattr*)skb->tail;
@@ -829,3 +845,5 @@ EXPORT_SYMBOL(rtnl_lock);
EXPORT_SYMBOL(rtnl_trylock);
EXPORT_SYMBOL(rtnl_unlock);
EXPORT_SYMBOL(rtnl_unicast);
+EXPORT_SYMBOL(rtnl_notify);
+EXPORT_SYMBOL(rtnl_set_sk_err);
Index: net-2.6.19.git/include/linux/rtnetlink.h
===================================================================
--- net-2.6.19.git.orig/include/linux/rtnetlink.h
+++ net-2.6.19.git/include/linux/rtnetlink.h
@@ -585,6 +585,9 @@ struct rtnetlink_link
extern struct rtnetlink_link * rtnetlink_links[NPROTO];
extern int rtnetlink_send(struct sk_buff *skb, u32 pid, u32 group, int echo);
extern int rtnl_unicast(struct sk_buff *skb, u32 pid);
+extern int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
+ struct nlmsghdr *nlh, gfp_t flags);
+extern void rtnl_set_sk_err(u32 group, int error);
extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const
void *data);
Index: net-2.6.19.git/include/net/netlink.h
===================================================================
--- net-2.6.19.git.orig/include/net/netlink.h
+++ net-2.6.19.git/include/net/netlink.h
@@ -65,6 +65,9 @@
* nlmsg_validate() validate netlink message incl. attrs
* nlmsg_for_each_attr() loop over all attributes
*
+ * Misc:
+ * nlmsg_report() report back to application?
+ *
* ------------------------------------------------------------------------
* Attributes Interface
* ------------------------------------------------------------------------
@@ -194,6 +197,9 @@ extern void netlink_run_queue(struct so
struct nlmsghdr *, int *));
extern void netlink_queue_skip(struct nlmsghdr *nlh,
struct sk_buff *skb);
+extern int nlmsg_notify(struct sock *sk, struct sk_buff *skb,
+ u32 pid, unsigned int group, int report,
+ gfp_t flags);
extern int nla_validate(struct nlattr *head, int len, int maxtype,
struct nla_policy *policy);
@@ -376,6 +382,17 @@ static inline int nlmsg_validate(struct
}
/**
+ * nlmsg_report - need to report back to application?
+ * @nlh: netlink message header
+ *
+ * Returns 1 if a report back to the application is requested.
+ */
+static inline int nlmsg_report(struct nlmsghdr *nlh)
+{
+ return !!(nlh->nlmsg_flags & NLM_F_ECHO);
+}
+
+/**
* nlmsg_for_each_attr - iterate over a stream of attributes
* @pos: loop counter, set to current attribute
* @nlh: netlink message header
-
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