Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Daniel Borkmann says:

====================
pull-request: bpf 2018-06-16

The following pull-request contains BPF updates for your *net* tree.

The main changes are:

1) Fix a panic in devmap handling in generic XDP where return type
   of __devmap_lookup_elem() got changed recently but generic XDP
   code missed the related update, from Toshiaki.

2) Fix a freeze when BPF progs are loaded that include BPF to BPF
   calls when JIT is enabled where we would later bail out via error
   path w/o dropping kallsyms, and another one to silence syzkaller
   splats from locking prog read-only, from Daniel.

3) Fix a bug in test_offloads.py BPF selftest which must not assume
   that the underlying system have no BPF progs loaded prior to test,
   and one in bpftool to fix accuracy of program load time, from Jakub.

4) Fix a bug in bpftool's probe for availability of the bpf(2)
   BPF_TASK_FD_QUERY subcommand, from Yonghong.

5) Fix a regression in AF_XDP's XDP_SKB receive path where queue
   id check got erroneously removed, from Björn.

6) Fix missing state cleanup in BPF's xfrm tunnel test, from William.

7) Check tunnel type more accurately in BPF's tunnel collect metadata
   kselftest, from Jian.

8) Fix missing Kconfig fragments for BPF kselftests, from Anders.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 7 insertions, 17 deletions

diff --git a/net/core/filter.c b/net/core/filter.c
index 3d9ba7e5965a..e7f12e9f598c 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3214,20 +3214,6 @@ err:
 }
 EXPORT_SYMBOL_GPL(xdp_do_redirect);
 
-static int __xdp_generic_ok_fwd_dev(struct sk_buff *skb, struct net_device *fwd)
-{
-	unsigned int len;
-
-	if (unlikely(!(fwd->flags & IFF_UP)))
-		return -ENETDOWN;
-
-	len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
-	if (skb->len > len)
-		return -EMSGSIZE;
-
-	return 0;
-}
-
 static int xdp_do_generic_redirect_map(struct net_device *dev,
 				       struct sk_buff *skb,
 				       struct xdp_buff *xdp,
@@ -3256,10 +3242,11 @@ static int xdp_do_generic_redirect_map(struct net_device *dev,
 	}
 
 	if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
-		if (unlikely((err = __xdp_generic_ok_fwd_dev(skb, fwd))))
+		struct bpf_dtab_netdev *dst = fwd;
+
+		err = dev_map_generic_redirect(dst, skb, xdp_prog);
+		if (unlikely(err))
 			goto err;
-		skb->dev = fwd;
-		generic_xdp_tx(skb, xdp_prog);
 	} else if (map->map_type == BPF_MAP_TYPE_XSKMAP) {
 		struct xdp_sock *xs = fwd;
 
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 36919a254ba3..3b3410ada097 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -118,6 +118,9 @@ int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
 	u64 addr;
 	int err;
 
+	if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index)
+		return -EINVAL;
+
 	if (!xskq_peek_addr(xs->umem->fq, &addr) ||
 	    len > xs->umem->chunk_size_nohr) {
 		xs->rx_dropped++;