llc: add support for SO_BINDTODEVICE
Using bind(MAC address) with LLC sockets has O(n) complexity, where n
is the number of interfaces. To overcome this, we add support for
SO_BINDTODEVICE which drops the complexity to O(1).
Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index ac691fe..c4d1a1d 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -259,7 +259,14 @@
if (!sock_flag(sk, SOCK_ZAPPED))
goto out;
rc = -ENODEV;
- llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
+ if (sk->sk_bound_dev_if) {
+ llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
+ if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
+ dev_put(llc->dev);
+ llc->dev = NULL;
+ }
+ } else
+ llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
if (!llc->dev)
goto out;
rc = -EUSERS;
@@ -310,7 +317,25 @@
goto out;
rc = -ENODEV;
rtnl_lock();
- llc->dev = dev_getbyhwaddr(&init_net, addr->sllc_arphrd, addr->sllc_mac);
+ if (sk->sk_bound_dev_if) {
+ llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
+ if (llc->dev) {
+ if (!addr->sllc_arphrd)
+ addr->sllc_arphrd = llc->dev->type;
+ if (llc_mac_null(addr->sllc_mac))
+ memcpy(addr->sllc_mac, llc->dev->dev_addr,
+ IFHWADDRLEN);
+ if (addr->sllc_arphrd != llc->dev->type ||
+ !llc_mac_match(addr->sllc_mac,
+ llc->dev->dev_addr)) {
+ rc = -EINVAL;
+ dev_put(llc->dev);
+ llc->dev = NULL;
+ }
+ }
+ } else
+ llc->dev = dev_getbyhwaddr(&init_net, addr->sllc_arphrd,
+ addr->sllc_mac);
rtnl_unlock();
if (!llc->dev)
goto out;