Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 97676b6b authored by Thomas Graf's avatar Thomas Graf Committed by David S. Miller
Browse files

[RTNETLINK]: Add rtnetlink notification interface 



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: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d387f6ad

include/linux/rtnetlink.h

+3 −0
Original line number Diff line number Diff line
@@ -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);

include/net/netlink.h

+17 −0
Original line number Diff line number Diff line
@@ -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 sock *sk, unsigned int *qlen, 
						    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);
@@ -375,6 +381,17 @@ static inline int nlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype, 
			    nlmsg_attrlen(nlh, hdrlen), maxtype, policy);

}



/**

 * 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

net/core/rtnetlink.c

+18 −0
Original line number Diff line number Diff line
@@ -171,6 +171,22 @@ int rtnl_unicast(struct sk_buff *skb, u32 pid) 
	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);