diff options
| author | Eric Dumazet <edumazet@google.com> | 2017-10-09 09:52:24 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-09 10:47:30 -0700 |
| commit | 66c77ff3a049a1d182c9c78cc6286bb1ceee70db (patch) | |
| tree | d856614a6a619320ac27228f043013f3e8ea152c | |
| parent | 1ee87d7a315aaf42b999c376dec508c8b3728b12 (diff) | |
| download | linux-66c77ff3a049a1d182c9c78cc6286bb1ceee70db.tar.bz2 | |
ipv6: addrlabel: rework ip6addrlbl_get()
If we allocate skb before the lookup, we can use RCU
without the need of ip6addrlbl_hold()
This means that the following patch can get rid of refcounting.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv6/addrlabel.c | 36 |
1 files changed, 13 insertions, 23 deletions
diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c index c6311d7108f6..f31489652c4a 100644 --- a/net/ipv6/addrlabel.c +++ b/net/ipv6/addrlabel.c @@ -546,38 +546,28 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, return -EINVAL; addr = nla_data(tb[IFAL_ADDRESS]); - rcu_read_lock(); - p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); - if (p && !ip6addrlbl_hold(p)) - p = NULL; - lseq = net->ipv6.ip6addrlbl_table.seq; - rcu_read_unlock(); - - if (!p) { - err = -ESRCH; - goto out; - } - skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL); - if (!skb) { - ip6addrlbl_put(p); + if (!skb) return -ENOBUFS; - } - err = ip6addrlbl_fill(skb, p, lseq, - NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, - RTM_NEWADDRLABEL, 0); + err = -ESRCH; - ip6addrlbl_put(p); + rcu_read_lock(); + p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index); + lseq = net->ipv6.ip6addrlbl_table.seq; + if (p) + err = ip6addrlbl_fill(skb, p, lseq, + NETLINK_CB(in_skb).portid, + nlh->nlmsg_seq, + RTM_NEWADDRLABEL, 0); + rcu_read_unlock(); if (err < 0) { WARN_ON(err == -EMSGSIZE); kfree_skb(skb); - goto out; + } else { + err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); } - - err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); -out: return err; } |