diff options
Diffstat (limited to 'src/net')
| -rw-r--r-- | src/net/netdevice.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/src/net/netdevice.c b/src/net/netdevice.c index e9cbb9e..88ca93f 100644 --- a/src/net/netdevice.c +++ b/src/net/netdevice.c @@ -442,7 +442,9 @@ struct net_device * alloc_netdev ( size_t priv_size ) { */ int register_netdev ( struct net_device *netdev ) { static unsigned int ifindex = 0; + struct ll_protocol *ll_protocol = netdev->ll_protocol; struct net_driver *driver; + uint32_t seed; int rc; /* Create device name */ @@ -453,10 +455,17 @@ int register_netdev ( struct net_device *netdev ) { /* Set initial link-layer address, if not already set */ if ( ! netdev_has_ll_addr ( netdev ) ) { - netdev->ll_protocol->init_addr ( netdev->hw_addr, - netdev->ll_addr ); + ll_protocol->init_addr ( netdev->hw_addr, netdev->ll_addr ); } + /* Use least significant bits of the link-layer address to + * improve the randomness of the (non-cryptographic) random + * number generator. + */ + memcpy ( &seed, ( netdev->ll_addr + ll_protocol->ll_addr_len + - sizeof ( seed ) ), sizeof ( seed ) ); + srand ( rand() ^ seed ); + /* Add to device list */ netdev_get ( netdev ); list_add_tail ( &netdev->list, &net_devices ); |