kernel: start working on 3.18 support

[openwrt/staging/chunkeey.git] / target / linux / generic / patches-3.18 / 630-packet_socket_type.patch

diff --git a/target/linux/generic/patches-3.18/630-packet_socket_type.patch b/target/linux/generic/patches-3.18/630-packet_socket_type.patch
new file mode 100644 (file)
index 0000000..06bd167
--- /dev/null
+++ b/target/linux/generic/patches-3.18/630-packet_socket_type.patch
@@ -0,0 +1,134 @@
+This patch allows the user to specify desired packet types (outgoing,
+broadcast, unicast, etc.) on packet sockets via setsockopt.
+This can reduce the load in situations where only a limited number
+of packet types are necessary
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
+--- a/include/uapi/linux/if_packet.h
++++ b/include/uapi/linux/if_packet.h
+@@ -31,6 +31,8 @@ struct sockaddr_ll {
+ #define PACKET_KERNEL         7               /* To kernel space      */
+ /* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */
+ #define PACKET_FASTROUTE      6               /* Fastrouted frame     */
++#define PACKET_MASK_ANY               0xffffffff      /* mask for packet type bits */
++
+ 
+ /* Packet socket options */
+ 
+@@ -54,6 +56,7 @@ struct sockaddr_ll {
+ #define PACKET_FANOUT                 18
+ #define PACKET_TX_HAS_OFF             19
+ #define PACKET_QDISC_BYPASS           20
++#define PACKET_RECV_TYPE              21
+ 
+ #define PACKET_FANOUT_HASH            0
+ #define PACKET_FANOUT_LB              1
+--- a/net/packet/af_packet.c
++++ b/net/packet/af_packet.c
+@@ -1530,6 +1530,7 @@ static int packet_rcv_spkt(struct sk_buf
+ {
+       struct sock *sk;
+       struct sockaddr_pkt *spkt;
++      struct packet_sock *po;
+ 
+       /*
+        *      When we registered the protocol we saved the socket in the data
+@@ -1537,6 +1538,7 @@ static int packet_rcv_spkt(struct sk_buf
+        */
+ 
+       sk = pt->af_packet_priv;
++      po = pkt_sk(sk);
+ 
+       /*
+        *      Yank back the headers [hope the device set this
+@@ -1549,7 +1551,7 @@ static int packet_rcv_spkt(struct sk_buf
+        *      so that this procedure is noop.
+        */
+ 
+-      if (skb->pkt_type == PACKET_LOOPBACK)
++      if (!(po->pkt_type & (1 << skb->pkt_type)))
+               goto out;
+ 
+       if (!net_eq(dev_net(dev), sock_net(sk)))
+@@ -1756,12 +1758,12 @@ static int packet_rcv(struct sk_buff *sk
+       int skb_len = skb->len;
+       unsigned int snaplen, res;
+ 
+-      if (skb->pkt_type == PACKET_LOOPBACK)
+-              goto drop;
+-
+       sk = pt->af_packet_priv;
+       po = pkt_sk(sk);
+ 
++      if (!(po->pkt_type & (1 << skb->pkt_type)))
++              goto drop;
++
+       if (!net_eq(dev_net(dev), sock_net(sk)))
+               goto drop;
+ 
+@@ -1881,12 +1883,12 @@ static int tpacket_rcv(struct sk_buff *s
+       BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
+       BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
+ 
+-      if (skb->pkt_type == PACKET_LOOPBACK)
+-              goto drop;
+-
+       sk = pt->af_packet_priv;
+       po = pkt_sk(sk);
+ 
++      if (!(po->pkt_type & (1 << skb->pkt_type)))
++              goto drop;
++
+       if (!net_eq(dev_net(dev), sock_net(sk)))
+               goto drop;
+ 
+@@ -2823,6 +2825,7 @@ static int packet_create(struct net *net
+       spin_lock_init(&po->bind_lock);
+       mutex_init(&po->pg_vec_lock);
+       po->prot_hook.func = packet_rcv;
++      po->pkt_type = PACKET_MASK_ANY & ~(1 << PACKET_LOOPBACK);
+ 
+       if (sock->type == SOCK_PACKET)
+               po->prot_hook.func = packet_rcv_spkt;
+@@ -3403,6 +3406,16 @@ packet_setsockopt(struct socket *sock, i
+               po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
+               return 0;
+       }
++        case PACKET_RECV_TYPE:
++        {
++                unsigned int val;
++                if (optlen != sizeof(val))
++                        return -EINVAL;
++                if (copy_from_user(&val, optval, sizeof(val)))
++                        return -EFAULT;
++                po->pkt_type = val & ~BIT(PACKET_LOOPBACK);
++                return 0;
++        }
+       default:
+               return -ENOPROTOOPT;
+       }
+@@ -3454,6 +3467,13 @@ static int packet_getsockopt(struct sock
+       case PACKET_VNET_HDR:
+               val = po->has_vnet_hdr;
+               break;
++      case PACKET_RECV_TYPE:
++              if (len > sizeof(unsigned int))
++                      len = sizeof(unsigned int);
++              val = po->pkt_type;
++
++              data = &val;
++              break;
+       case PACKET_VERSION:
+               val = po->tp_version;
+               break;
+--- a/net/packet/internal.h
++++ b/net/packet/internal.h
+@@ -117,6 +117,7 @@ struct packet_sock {
+       struct net_device __rcu *cached_dev;
+       int                     (*xmit)(struct sk_buff *skb);
+       struct packet_type      prot_hook ____cacheline_aligned_in_smp;
++      unsigned int            pkt_type;
+ };
+ 
+ static struct packet_sock *pkt_sk(struct sock *sk)