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bpf: update skb->protocol in bpf_skb_net_grow 

Some tunnels, like sit, change the network protocol of packet.
If so, update skb->protocol to match the new type.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Willem de Bruijn 2019-04-23 14:43:48 -04:00 committed by Daniel Borkmann
parent 2aad32613c
commit 1b00e0dfe7
1 changed files with 8 additions and 0 deletions
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8
net/core/filter.c
View File

@ -3081,6 +3081,14 @@ static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff,
skb_set_transport_header(skb, mac_len + nh_len);
}
/* Match skb->protocol to new outer l3 protocol */
if (skb->protocol == htons(ETH_P_IP) &&
flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
skb->protocol = htons(ETH_P_IPV6);
else if (skb->protocol == htons(ETH_P_IPV6) &&
flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)
skb->protocol = htons(ETH_P_IP);
}
if (skb_is_gso(skb)) {