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>
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 1e5f673..35a07c8 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -622,8 +622,8 @@
extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
extern int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid);
-extern int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
- struct nlmsghdr *nlh, gfp_t flags);
+extern void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid,
+ u32 group, struct nlmsghdr *nlh, gfp_t flags);
extern void rtnl_set_sk_err(struct net *net, u32 group, int error);
extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index ba7be19..fcffb3f 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -98,7 +98,8 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
+ rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_LINK, err);
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 32b3a01..98691e1 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -588,7 +588,8 @@
goto errout;
}
- err = rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
+ rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(net, ops->nlgroup, err);
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 278a142..e1144cb 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2534,7 +2534,8 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
+ rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 790dd20..d78030f 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -455,8 +455,8 @@
return nlmsg_unicast(rtnl, skb, pid);
}
-int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
- struct nlmsghdr *nlh, gfp_t flags)
+void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
+ struct nlmsghdr *nlh, gfp_t flags)
{
struct sock *rtnl = net->rtnl;
int report = 0;
@@ -464,7 +464,7 @@
if (nlh)
report = nlmsg_report(nlh);
- return nlmsg_notify(rtnl, skb, pid, group, report, flags);
+ nlmsg_notify(rtnl, skb, pid, group, report, flags);
}
void rtnl_set_sk_err(struct net *net, u32 group, int error)
@@ -1246,7 +1246,8 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
+ rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_LINK, err);
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index daf2b98..e457769 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -769,7 +769,8 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
+ rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
+ return;
errout:
if (err < 0)
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 69ad928..67054b0 100644
--- a/net/decnet/dn_table.c
+++ b/net/decnet/dn_table.c
@@ -375,7 +375,8 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, &init_net, pid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL);
+ rtnl_notify(skb, &init_net, pid, RTNLGRP_DECnet_ROUTE, nlh, GFP_KERNEL);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_ROUTE, err);
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index d519a6a..126bb91 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1216,7 +1216,8 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
+ rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 4817dea..f831df5 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -322,8 +322,9 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, info->nl_net, info->pid, RTNLGRP_IPV4_ROUTE,
- info->nlh, GFP_KERNEL);
+ rtnl_notify(skb, info->nl_net, info->pid, RTNLGRP_IPV4_ROUTE,
+ info->nlh, GFP_KERNEL);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(info->nl_net, RTNLGRP_IPV4_ROUTE, err);
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 03e2a1a..f8f76d6 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3638,7 +3638,8 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
@@ -3849,7 +3850,8 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
@@ -3919,7 +3921,8 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 3cd83b8..9f061d1 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1095,11 +1095,7 @@
&ipv6_hdr(ra)->saddr);
nlmsg_end(skb, nlh);
- err = rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL,
- GFP_ATOMIC);
- if (err < 0)
- goto errout;
-
+ rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
return;
nla_put_failure:
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index c3d486a..1394ddb 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2400,8 +2400,9 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
- info->nlh, gfp_any());
+ rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
+ info->nlh, gfp_any());
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index ed587be..2760b62 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1760,12 +1760,18 @@
exclude_pid = pid;
}
- /* errors reported via destination sk->sk_err */
- nlmsg_multicast(sk, skb, exclude_pid, group, flags);
+ /* errors reported via destination sk->sk_err, but propagate
+ * delivery errors if NETLINK_BROADCAST_ERROR flag is set */
+ err = nlmsg_multicast(sk, skb, exclude_pid, group, flags);
}
- if (report)
- err = nlmsg_unicast(sk, skb, pid);
+ if (report) {
+ int err2;
+
+ err2 = nlmsg_unicast(sk, skb, pid);
+ if (!err || err == -ESRCH)
+ err = err2;
+ }
return err;
}
diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c
index 1ceea1f..cec4e59 100644
--- a/net/phonet/pn_netlink.c
+++ b/net/phonet/pn_netlink.c
@@ -47,8 +47,9 @@
kfree_skb(skb);
goto errout;
}
- err = rtnl_notify(skb, dev_net(dev), 0,
- RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
+ rtnl_notify(skb, dev_net(dev), 0,
+ RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
+ return;
errout:
if (err < 0)
rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);