diff options
| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2013-03-22 06:28:42 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-03-24 17:16:29 -0400 |
| commit | 0465277f6b3fd0535428ae935644ac30ce903de0 (patch) | |
| tree | d773aa622e9f208114a37487bf4dac0862def51d /net | |
| parent | 976c90b90187f2eb4778d766d52d6ab176714734 (diff) | |
| download | linux-0465277f6b3fd0535428ae935644ac30ce903de0.tar.bz2 | |
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')
| -rw-r--r-- | net/core/rtnetlink.c | 5 | ||||
| -rw-r--r-- | net/ipv4/devinet.c | 6 |
2 files changed, 10 insertions, 1 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 751f1244b648..aeb81316a704 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1929,8 +1929,11 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) if (rtnl_msg_handlers[idx] == NULL || rtnl_msg_handlers[idx][type].dumpit == NULL) continue; - if (idx > s_idx) + if (idx > s_idx) { memset(&cb->args[0], 0, sizeof(cb->args)); + cb->prev_seq = 0; + cb->seq = 0; + } if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) break; } diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index 20a9f9274f3f..5d985e367535 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++; } |