Add new bpf_skb_adjust_room() decapsulation flags: - BPF_F_ADJ_ROOM_DECAP_L4_GRE - BPF_F_ADJ_ROOM_DECAP_L4_UDP - BPF_F_ADJ_ROOM_DECAP_IPXIP4 - BPF_F_ADJ_ROOM_DECAP_IPXIP6 These flags let BPF programs describe which tunnel layer is being removed, so later changes can update tunnel-related GSO state accordingly during decapsulation. This patch only introduces the UAPI flag definitions and helper documentation.
Showing the changes to tools/include/uapi (1 of 2 files). Show all
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| @@ -3038,8 +3038,34 @@ union bpf_attr { · 3037 unmodified lines | ||
| 3038 | 3038 | * |
| 3039 | 3039 | * * **BPF_F_ADJ_ROOM_DECAP_L3_IPV4**, |
| 3040 | 3040 | * **BPF_F_ADJ_ROOM_DECAP_L3_IPV6**: |
| 3041 | − * Indicate the new IP header version after decapsulating the outer | |
| 3042 | − * IP header. Used when the inner and outer IP versions are different. | |
| 3041 | + * Indicate the new IP header version after decapsulating the | |
| 3042 | + * outer IP header. Used when the inner and outer IP versions | |
| 3043 | + * are different. These flags only trigger a protocol change | |
| 3044 | + * without clearing any tunnel-specific GSO flags. | |
| 3045 | + * | |
| 3046 | + * * **BPF_F_ADJ_ROOM_DECAP_L4_GRE**: | |
| 3047 | + * Clear GRE tunnel GSO flags (SKB_GSO_GRE and SKB_GSO_GRE_CSUM) | |
| 3048 | + * when decapsulating a GRE tunnel. | |
| 3049 | + * | |
| 3050 | + * * **BPF_F_ADJ_ROOM_DECAP_L4_UDP**: | |
| 3051 | + * Clear UDP tunnel GSO flags (SKB_GSO_UDP_TUNNEL and | |
| 3052 | + * SKB_GSO_UDP_TUNNEL_CSUM) when decapsulating a UDP tunnel. | |
| 3053 | + * | |
| 3054 | + * * **BPF_F_ADJ_ROOM_DECAP_IPXIP4**: | |
| 3055 | + * Clear IPIP/SIT tunnel GSO flag (SKB_GSO_IPXIP4) when decapsulating | |
| 3056 | + * a tunnel with an outer IPv4 header (IPv4-in-IPv4 or IPv6-in-IPv4). | |
| 3057 | + * | |
| 3058 | + * * **BPF_F_ADJ_ROOM_DECAP_IPXIP6**: | |
| 3059 | + * Clear IPv6 encapsulation tunnel GSO flag (SKB_GSO_IPXIP6) when | |
| 3060 | + * decapsulating a tunnel with an outer IPv6 header (IPv6-in-IPv6 | |
| 3061 | + * or IPv4-in-IPv6). | |
| 3062 | + * | |
| 3063 | + * When using the decapsulation flags above, the skb->encapsulation | |
| 3064 | + * flag is automatically cleared if all tunnel-specific GSO flags | |
| 3065 | + * (SKB_GSO_UDP_TUNNEL, SKB_GSO_UDP_TUNNEL_CSUM, SKB_GSO_GRE, | |
| 3066 | + * SKB_GSO_GRE_CSUM, SKB_GSO_IPXIP4, SKB_GSO_IPXIP6) have been | |
| 3067 | + * removed from the packet. This handles cases where all tunnel | |
| 3068 | + * layers have been decapsulated. | |
| 3043 | 3069 | * |
| 3044 | 3070 | * A call to this helper is susceptible to change the underlying |
| 3045 | 3071 | * packet buffer. Therefore, at load time, all checks on pointers |
| @@ -6293,6 +6319,10 @@ enum bpf_adj_room_flags { · 3247 unmodified lines | ||
| 6293 | 6319 | BPF_F_ADJ_ROOM_ENCAP_L2_ETH = (1ULL << 6), |
| 6294 | 6320 | BPF_F_ADJ_ROOM_DECAP_L3_IPV4 = (1ULL << 7), |
| 6295 | 6321 | BPF_F_ADJ_ROOM_DECAP_L3_IPV6 = (1ULL << 8), |
| 6322 | + BPF_F_ADJ_ROOM_DECAP_L4_GRE = (1ULL << 9), | |
| 6323 | + BPF_F_ADJ_ROOM_DECAP_L4_UDP = (1ULL << 10), | |
| 6324 | + BPF_F_ADJ_ROOM_DECAP_IPXIP4 = (1ULL << 11), | |
| 6325 | + BPF_F_ADJ_ROOM_DECAP_IPXIP6 = (1ULL << 12), | |
| 6296 | 6326 | }; |
| 6297 | 6327 | |
| 6298 | 6328 | enum { |