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authorPablo Neira Ayuso <pablo@netfilter.org>2009-02-25 02:18:28 -0500
committerDavid S. Miller <davem@davemloft.net>2009-02-25 02:18:28 -0500
commit1ce85fe402137824246bad03ff85f3913d565c17 (patch)
tree3a54c150e9616709a8f65270cd1f4aeecac4d48e /net/decnet
parent4fb0a54a55d34c28dc53c39567ce171166572699 (diff)
netlink: change nlmsg_notify() return value logic
This patch changes the return value of nlmsg_notify() as follows: If NETLINK_BROADCAST_ERROR is set by any of the listeners and an error in the delivery happened, return the broadcast error; else if there are no listeners apart from the socket that requested a change with the echo flag, return the result of the unicast notification. Thus, with this patch, the unicast notification is handled in the same way of a broadcast listener that has set the NETLINK_BROADCAST_ERROR socket flag. This patch is useful in case that the caller of nlmsg_notify() wants to know the result of the delivery of a netlink notification (including the broadcast delivery) and take any action in case that the delivery failed. For example, ctnetlink can drop packets if the event delivery failed to provide reliable logging and state-synchronization at the cost of dropping packets. This patch also modifies the rtnetlink code to ignore the return value of rtnl_notify() in all callers. The function rtnl_notify() (before this patch) returned the error of the unicast notification which makes rtnl_set_sk_err() reports errors to all listeners. This is not of any help since the origin of the change (the socket that requested the echoing) notices the ENOBUFS error if the notification fails and should resync itself. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/decnet')
-rw-r--r--net/decnet/dn_dev.c3
-rw-r--r--net/decnet/dn_table.c3
2 files changed, 4 insertions, 2 deletions
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index daf2b98b15fe..e457769bf7a7 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -769,7 +769,8 @@ static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
769 kfree_skb(skb); 769 kfree_skb(skb);
770 goto errout; 770 goto errout;
771 } 771 }
772 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL); 772 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
773 return;
773errout: 774errout:
774 if (err < 0) 775 if (err < 0)
775 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err); 776 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c
index 69ad9280c693..67054b0d550f 100644
--- a/net/decnet/dn_table.c
+++ b/net/decnet/dn_table.c
@@ -375,7 +375,8 @@ static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, u32 tb_id,
375 kfree_skb(skb); 375 kfree_skb(skb);
376 goto errout; 376 goto errout;
377 } 377 }
378 err = rtnl_notify(skb, &init_net, pid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL); 378 rtnl_notify(skb, &init_net, pid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL);
379 return;
379errout: 380errout:
380 if (err < 0) 381 if (err < 0)
381 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err); 382 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err);