diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2015-01-19 12:15:24 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-01-19 16:20:17 -0500 |
| commit | 926e9878a360fc57112259949c44c74c31709cc6 (patch) | |
| tree | 156970a8248c5512200df2718c242bb3535d74ef | |
| parent | fc83477780174dc6aa673e644428b1d2f3894e7a (diff) | |
| download | linux-926e9878a360fc57112259949c44c74c31709cc6.tar.bz2 | |
phonet netlink: allow multiple messages per skb in route dump
My previous patch to this file changed the code to be bug-compatible
towards userspace. Unless userspace (which I wasn't able to find)
implements the dump reader by hand in a wrong way, this isn't needed.
If it uses libnl or similar code putting multiple messages into a
single SKB is far more efficient.
Change the code to do this. While at it, also clean it up and don't
use so many variables - just store the address in the callback args
directly.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/phonet/pn_netlink.c | 22 |
1 files changed, 7 insertions, 15 deletions
diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c index 54d766842c2b..bc5ee5fbe6ae 100644 --- a/net/phonet/pn_netlink.c +++ b/net/phonet/pn_netlink.c @@ -272,31 +272,23 @@ static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh) static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb) { struct net *net = sock_net(skb->sk); - u8 addr, addr_idx = 0, addr_start_idx = cb->args[0]; + u8 addr; rcu_read_lock(); - for (addr = 0; addr < 64; addr++) { - struct net_device *dev; + for (addr = cb->args[0]; addr < 64; addr++) { + struct net_device *dev = phonet_route_get_rcu(net, addr << 2); - dev = phonet_route_get_rcu(net, addr << 2); if (!dev) continue; - if (addr_idx++ < addr_start_idx) - continue; - fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid, - cb->nlh->nlmsg_seq, RTM_NEWROUTE); - /* fill_route() used to return > 0 (or negative errors) but - * never 0 - ignore the return value and just go out to - * call dumpit again from outside to preserve the behavior - */ - goto out; + if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, RTM_NEWROUTE) < 0) + goto out; } out: rcu_read_unlock(); - cb->args[0] = addr_idx; - cb->args[1] = 0; + cb->args[0] = addr; return skb->len; } |