[NETLINK]: Ignore !NLM_F_REQUEST messages directly in netlink_run_queue()

netlink_rcv_skb() is changed to skip messages which don't have the
NLM_F_REQUEST bit to avoid every netlink family having to perform this
check on their own.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 4398cb8..cc09283 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -862,10 +862,6 @@ rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
        int type;
        int err;
 
-       /* Only requests are handled by kernel now */
-       if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
-               return 0;
-
        type = nlh->nlmsg_type;
 
        /* A control message: ignore them */

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 8488c15..7b45598 100644 (file)
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1470,10 +1470,15 @@ static int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
 
        while (skb->len >= nlmsg_total_size(0)) {
                nlh = nlmsg_hdr(skb);
+               err = 0;
 
                if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len)
                        return 0;
 
+               /* Only requests are handled by the kernel */
+               if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
+                       goto skip;
+
                if (cb(skb, nlh, &err) < 0) {
                        /* Not an error, but we have to interrupt processing
                         * here. Note: that in this case we do not pull
@@ -1481,9 +1486,10 @@ static int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
                         */
                        if (err == 0)
                                return -1;
+               }
+skip:
+               if (nlh->nlmsg_flags & NLM_F_ACK || err)
                        netlink_ack(skb, nlh, err);
-               } else if (nlh->nlmsg_flags & NLM_F_ACK)
-                       netlink_ack(skb, nlh, 0);
 
                netlink_queue_skip(nlh, skb);
        }

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index c299679..039516f 100644 (file)
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -304,9 +304,6 @@ static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
        struct genlmsghdr *hdr = nlmsg_data(nlh);
        int hdrlen, err = -EINVAL;
 
-       if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
-               goto ignore;
-
        if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
                goto ignore;
 

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 6b7f6dc..913c8b7 100644 (file)
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1858,9 +1858,6 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *err
        struct xfrm_link *link;
        int type, min_len;
 
-       if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
-               return 0;
-
        type = nlh->nlmsg_type;
 
        /* A control message: ignore them */