linux/net/core
Pablo Neira Ayuso 1ce85fe402 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>
2009-02-24 23:18:28 -08:00
..
Makefile net: Add SKB DMA mapping helper functions. 2008-09-11 04:51:14 -07:00
datagram.c net: sk_free_datagram() should use sk_mem_reclaim_partial() 2008-11-05 01:38:06 -08:00
dev.c netns: Remove net_alive 2009-02-22 19:54:50 -08:00
dev_mcast.c net: Rationalise email address: Network Specific Parts 2008-10-13 19:01:08 -07:00
dst.c net: speedup dst_release() 2008-11-14 00:53:54 -08:00
ethtool.c ethtool: Add RX pkt classification interface 2009-02-20 00:58:13 -08:00
fib_rules.c netlink: change nlmsg_notify() return value logic 2009-02-24 23:18:28 -08:00
filter.c filter: add SKF_AD_NLATTR_NEST to look for nested attributes 2008-11-20 00:49:27 -08:00
flow.c netns xfrm: lookup in netns 2008-11-25 17:35:18 -08:00
gen_estimator.c pkt_sched: gen_estimator: Optimize gen_estimator_active() 2008-11-26 15:24:32 -08:00
gen_stats.c [NET_SCHED]: Convert packet schedulers from rtnetlink to new netlink API 2008-01-28 15:11:10 -08:00
iovec.c net: Use standard structures for generic socket address structures. 2008-07-19 22:35:47 -07:00
kmap_skb.h [PATCH] severing skbuff.h -> highmem.h 2006-12-04 02:00:29 -05:00
link_watch.c Revert "net: Fix for initial link state in 2.6.28" 2009-01-05 16:01:51 -08:00
neighbour.c netlink: change nlmsg_notify() return value logic 2009-02-24 23:18:28 -08:00
net-sysfs.c netns: filter out uevent not belonging to init_net 2008-11-25 16:46:37 -08:00
net-sysfs.h netns: Fix device renaming for sysfs 2008-05-02 17:00:58 -07:00
net_namespace.c Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-02-24 03:50:29 -08:00
netevent.c [NET]: net/core/netevent.c should #include <net/netevent.h> 2007-07-05 17:40:27 -07:00
netpoll.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-15 20:03:50 -08:00
pktgen.c netns xfrm: finding states in netns 2008-11-25 17:31:51 -08:00
request_sock.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
rtnetlink.c netlink: change nlmsg_notify() return value logic 2009-02-24 23:18:28 -08:00
scm.c Merge branch 'master' into next 2008-11-18 18:52:37 +11:00
skb_dma_map.c net: Fix off-by-one in skb_dma_map 2008-10-12 21:07:34 -07:00
skbuff.c Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-02-24 03:50:29 -08:00
sock.c Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-02-24 03:50:29 -08:00
stream.c net: Rationalise email address: Network Specific Parts 2008-10-13 19:01:08 -07:00
sysctl_net_core.c netns xfrm: per-netns sysctls 2008-11-25 18:00:48 -08:00
user_dma.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-26 20:17:56 -07:00
utils.c printk ratelimiting rewrite 2008-07-25 10:53:29 -07:00