diff options
| -rw-r--r-- | net/netlink/af_netlink.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index a17dda1..8df7f64 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -168,16 +168,43 @@ int netlink_remove_tap(struct netlink_tap *nt) } EXPORT_SYMBOL_GPL(netlink_remove_tap); +static bool netlink_filter_tap(const struct sk_buff *skb) +{ + struct sock *sk = skb->sk; + bool pass = false; + + /* We take the more conservative approach and + * whitelist socket protocols that may pass. + */ + switch (sk->sk_protocol) { + case NETLINK_ROUTE: + case NETLINK_USERSOCK: + case NETLINK_SOCK_DIAG: + case NETLINK_NFLOG: + case NETLINK_XFRM: + case NETLINK_FIB_LOOKUP: + case NETLINK_NETFILTER: + case NETLINK_GENERIC: + pass = true; + break; + } + + return pass; +} + static int __netlink_deliver_tap_skb(struct sk_buff *skb, struct net_device *dev) { struct sk_buff *nskb; + struct sock *sk = skb->sk; int ret = -ENOMEM; dev_hold(dev); nskb = skb_clone(skb, GFP_ATOMIC); if (nskb) { nskb->dev = dev; + nskb->protocol = htons((u16) sk->sk_protocol); + ret = dev_queue_xmit(nskb); if (unlikely(ret > 0)) ret = net_xmit_errno(ret); @@ -192,6 +219,9 @@ static void __netlink_deliver_tap(struct sk_buff *skb) int ret; struct netlink_tap *tmp; + if (!netlink_filter_tap(skb)) + return; + list_for_each_entry_rcu(tmp, &netlink_tap_all, list) { ret = __netlink_deliver_tap_skb(skb, tmp->dev); if (unlikely(ret)) |
