Commits on Feb 13, 2024

1. srv6: Fix packet drop with GSO type mismatch …

   When the Pod generates a TCP stream larger than MSS, it may be sent as a
   GSO large packet. We observed in such a case, SRv6-encapsulated packet
   is dropped.
   
   The root cause was a misuse of ctx_adjust_hroom. We call it
   ctx_adjust_hroom(ctx, growth, BPF_ADJ_ROOM_MAC, 0), but this way, the
   helper is not aware of what kind of encapsulation we want to perform, so
   it doesn't adjust skb->inner_protocol (should be ETH_P_IP) and
   skb_shinfo->gso_type (should be SKB_GSO_IPXIP6 | SKB_GSO_TCPV4)
   appropriately. As a result, the packet will be dropped in
   ip4ip6_gso_segment due to the flag mismatch.
   
   Use BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 flag which is introduced to solve this
   problem.
   
   Signed-off-by: Yutaro Hayakawa <yutaro.hayakawa@isovalent.com>

   

   YutaroHayakawa committed Feb 13, 2024
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