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[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: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2006-08-15 00:31:41 -07:00 committed by David S. Miller
parent d387f6ad10
commit 97676b6b55
3 changed files with 38 additions and 0 deletions
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3
include/linux/rtnetlink.h
View File

@ -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);

17
include/net/netlink.h
View File

@ -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

18
net/core/rtnetlink.c
View File

@ -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);