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authorNicolas Dichtel <nicolas.dichtel@6wind.com>2013-03-22 06:28:42 +0000
committerDavid S. Miller <davem@davemloft.net>2013-03-24 17:16:29 -0400
commit0465277f6b3fd0535428ae935644ac30ce903de0 (patch)
treed773aa622e9f208114a37487bf4dac0862def51d /net/ipv4/devinet.c
parent976c90b90187f2eb4778d766d52d6ab176714734 (diff)
downloadop-kernel-dev-0465277f6b3fd0535428ae935644ac30ce903de0.zip
op-kernel-dev-0465277f6b3fd0535428ae935644ac30ce903de0.tar.gz
ipv4: provide addr and netconf dump consistency info
This patch takes benefit of dev_addr_genid and dev_base_seq to check if a change occurs during a netlink dump. If a change is detected, the flag NLM_F_DUMP_INTR is set in the first message after the dump was interrupted. Note that seq and prev_seq must be reset between each family in rtnl_dump_all() because they are specific to each family. Reported-by: Junwei Zhang <junwei.zhang@6wind.com> Reported-by: Hongjun Li <hongjun.li@6wind.com> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/devinet.c')
-rw-r--r--net/ipv4/devinet.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 20a9f92..5d985e3 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1499,6 +1499,8 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
idx = 0;
head = &net->dev_index_head[h];
rcu_read_lock();
+ cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
+ net->dev_base_seq;
hlist_for_each_entry_rcu(dev, head, index_hlist) {
if (idx < s_idx)
goto cont;
@@ -1519,6 +1521,7 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
rcu_read_unlock();
goto done;
}
+ nl_dump_check_consistent(cb, nlmsg_hdr(skb));
}
cont:
idx++;
@@ -1807,6 +1810,8 @@ static int inet_netconf_dump_devconf(struct sk_buff *skb,
idx = 0;
head = &net->dev_index_head[h];
rcu_read_lock();
+ cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
+ net->dev_base_seq;
hlist_for_each_entry_rcu(dev, head, index_hlist) {
if (idx < s_idx)
goto cont;
@@ -1824,6 +1829,7 @@ static int inet_netconf_dump_devconf(struct sk_buff *skb,
rcu_read_unlock();
goto done;
}
+ nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
idx++;
}
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