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author | Thomas Graf <tgraf@suug.ch> | 2006-08-15 00:31:41 -0700 |
---|---|---|
committer | David S. Miller <davem@sunset.davemloft.net> | 2006-09-22 14:54:50 -0700 |
commit | 97676b6b5538b3e059d33b8338e7d5cc41c5f1f1 (patch) | |
tree | 76e41eb58bd86a96e204dacbb6746da387e67452 | |
parent | d387f6ad10764fc2174373b4a1cca443adee36e3 (diff) | |
download | kernel_samsung_smdk4412-97676b6b5538b3e059d33b8338e7d5cc41c5f1f1.zip kernel_samsung_smdk4412-97676b6b5538b3e059d33b8338e7d5cc41c5f1f1.tar.gz kernel_samsung_smdk4412-97676b6b5538b3e059d33b8338e7d5cc41c5f1f1.tar.bz2 |
[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>
-rw-r--r-- | include/linux/rtnetlink.h | 3 | ||||
-rw-r--r-- | include/net/netlink.h | 17 | ||||
-rw-r--r-- | net/core/rtnetlink.c | 18 |
3 files changed, 38 insertions, 0 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h index 0e4f478..ecbe034 100644 --- a/include/linux/rtnetlink.h +++ b/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); diff --git a/include/net/netlink.h b/include/net/netlink.h index b154b81..bf593eb 100644 --- a/include/net/netlink.h +++ b/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 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); @@ -376,6 +382,17 @@ static inline int nlmsg_validate(struct nlmsghdr *nlh, int hdrlen, int maxtype, } /** + * 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 diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index e02fa6a..2b1af17 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -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); |