Hi All, We have tunnel test scenario as below IPsec tunnel gets created between 1. Our device 3000:0000:0000:0000:b25c:daff:fe67:f173 2. Gateway 3001:0000:0000:0000:0200:10ff:fe10:1161 There are 2 hosts behind the gateway 1. Host1 3002:0000:0000:0000:0200:10ff:fe10:1280 2. Host2 3002:0000:0000:0000:0200:10ff:fe10:1161 Packet sequence: 1. Host1 Sends a ping request 2. Device Sends successful ping response 3. Host1 Sends a ping request (fragmented) 4. Device Handles fragmented packets and sends a successful ping response. 5. Host2 Sends packet too big request with MTU indicated 6. Host1 Sends ping request 7. Device Fails to send fragmented response, sends ping response. Issue is with packet number 5. 1. From IPv6 recv hook, packet comes to XFRM recv hook. 2. At high level, there seems to be no issue with packet. Hence XFRM state gets allocated to packet. And IPsec peer addresses are assigned in the state properly. 3. Packet gets decrypted by ESP and then reaches ICMP recv hook. 4. Again XFRM policy look up is done. This is failing as XFRM policy seems to be invalid. Hence packet gets dropped silently. When the packet is received in xfrm_input and assigned a xfrm_state as below daddr 0000:0000:0000:0000:0000:0000:0000:0000 dport 0 dport_mask 0 prefixlen_d 0 saddr 0000:0000:0000:0000:0000:0000:0000:0000 sport 0 sport_mask 0 prefixlen_s 0 family 0 proto 0 ifindex 0 daddr 3000:0000:0000:0000:b25c:daff:fe67:f173 spi -1503044001 proto 50 mark 0 0 saddr 3001:0000:0000:0000:0200:10ff:fe10:1161 In icmpv6_rcv hook when XFRM policy look up is done mark 8 248 daddr 0000:0000:0000:0000:0000:0000:0000:0000 dport 0 dport_mask 255 prefixlen_d 0 saddr 0000:0000:0000:0000:0000:0000:0000:0000 sport 512 sport_mask 65535 prefixlen_s 0 family 10 proto 58 ifindex 0 type 0 action 0 flags 0 xfrmr_nr 0 priority 20096408 daddr 0000:0000:0000:0000:0000:0000:0000:0000 spi 0 proto 0 saddr 0000:0000:0000:0000:0000:0000:0000:0000 family 0 reqid 0 mode 0 share 0 We are using the Linux 4.9.180 #71 SMP PREEMPT aarch64 GNU/Linux. Did anyone face this kind of issues? Can you please provide me any inputs? Thanks and regards, Jayalakshmi
