[Edited Message Follows] Hi VPP-Dev,
We recently moved to 1810 from 1801 and found the following issue. Is this a known issue (or) any help on whats happening here ? 1. We are using memif in IP mode. 2. Some Control plane process sends message over MEMIF to VPP process ( memif mode = IP ) 3. We are using a custom ip-proto value of 222 and tapping these packets in a separate graph node on VPP side. 4. This has been working fine till 1801. 5. When we moved to 1810, the packet is getting dropped in ip4-local with reason as "blackholed packets" 6. When we looked at the code, this drop can happen in the following reasons - SRC-IP invalid - TCP/UDP checksum wrong 7. The FIB contains the SRC-IP subnet. Hence, SRC-IP error might not be the reason 8. We are suspecting that this drop is due to TCP/UDP csum. But, when the ip-proto is non-UDP-TCP, ideally this packet should have gone to the next layer bypassing all these checks. Following is the packet trace / show output and fib details === ##) vpp# show node counters Count Node Reason 2 null-node blackholed packets ##) vpp# show trace Packet 1 00:48:08:119264: memif-input memif: hw_if_index 3 next-index 0 slot: ring 0 00:48:08:119354: ip4-input-no-checksum unknown 222: 192.168.1.2 -> 192.168.1.1 tos 0x00, ttl 64, length 10020, checksum 0xcfbe fragment id 0x0000 00:48:08:120320: ip4-lookup fib 0 dpo-idx 5 flow hash: 0x00000000 unknown 222: 192.168.1.2 -> 192.168.1.1 tos 0x00, ttl 64, length 10020, checksum 0xcfbe fragment id 0x0000 00:48:08:120331: ip4-local unknown 222: 192.168.1.2 -> 192.168.1.1 tos 0x00, ttl 64, length 10020, checksum 0xcfbe fragment id 0x0000 ##) vpp# show ip fib ipv4-VRF:0, fib_index:0, flow hash:[src dst sport dport proto ] locks:[src:plugin-hi:2, src:default-route:1, ] 192.168.1.0/32 unicast-ip4-chain [@0]: dpo-load-balance: [proto:ip4 index:10 buckets:1 uRPF:9 to:[0:0]] [0] [@0]: dpo-drop ip4 192.168.1.0/24 unicast-ip4-chain [@0]: dpo-load-balance: [proto:ip4 index:9 buckets:1 uRPF:12 to:[0:0]] [0] [@5]: ipv4 via 0.0.0.0 memif0/0: mtu:9000 192.168.1.1/32 unicast-ip4-chain [@0]: dpo-load-balance: [proto:ip4 index:12 buckets:1 uRPF:13 to:[1:10020]] [0] [@2]: dpo-receive: 192.168.1.1 on memif0/0 192.168.1.255/32 unicast-ip4-chain [@0]: dpo-load-balance: [proto:ip4 index:11 buckets:1 uRPF:11 to:[0:0]] [0] [@0]: dpo-drop ip4 ==== Also, is there anyway to get the exact sub-error-code which indicates that this is due to TCP/UDP checksum error etc ? Appreciate any inputs in this regard. Thanks & Regards, Satish
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