From 6d5fc1957989266006db6ef3dfb9159b42cf0189 Mon Sep 17 00:00:00 2001 From: Toshiaki Makita Date: Thu, 14 Jun 2018 11:07:42 +0900 Subject: xdp: Fix handling of devmap in generic XDP Commit 67f29e07e131 ("bpf: devmap introduce dev_map_enqueue") changed the return value type of __devmap_lookup_elem() from struct net_device * to struct bpf_dtab_netdev * but forgot to modify generic XDP code accordingly. Thus generic XDP incorrectly used struct bpf_dtab_netdev where struct net_device is expected, then skb->dev was set to invalid value. v2: - Fix compiler warning without CONFIG_BPF_SYSCALL. Fixes: 67f29e07e131 ("bpf: devmap introduce dev_map_enqueue") Signed-off-by: Toshiaki Makita Acked-by: Yonghong Song Acked-by: Jesper Dangaard Brouer Signed-off-by: Daniel Borkmann --- net/core/filter.c | 21 ++++----------------- 1 file changed, 4 insertions(+), 17 deletions(-) (limited to 'net') 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; -- cgit v1.2.3