Hi all,
We performed below test on VPP 18.07, and it seems that IP reassembly doesn't
work in VPP 18.07.
Below is the test topology:
Machine A is the VPP DUT, while machine B is just a standard Linux server.
Network topology: Machine A (VPP) <----> Machine B ; And set both MTU to 1500
Issue: "ping A_ip -s 2000" at B doesn't get reply from A; While from VPP (A),
"ping B_ip size 1900" does.
Could you help to take a look at this issue? Thanks a lot.
Below is the configuration and packet trace:
VPP CLI:
set interface state TenGigabitEthernetaf/0/1 up
set interface ip address TenGigabitEthernetaf/0/1 10.1.1.2/24
set interface mtu 1500 TenGigabitEthernetaf/0/1
set interface reassembly TenGigabitEthernetaf/0/1 on
vpp# show errors
314 ip4-frag malformed packet
Vpp# show trace
Packet 1
00:04:02:492398: dpdk-input
TenGigabitEthernetaf/0/1 rx queue 0
buffer 0x2556: current data 14, length 1500, free-list 0, clone-count 0,
totlen-nifb 0, trace 0x0
ext-hdr-valid
l4-cksum-computed l4-cksum-correct l2-hdr-offset 0
PKT MBUF: port 0, nb_segs 1, pkt_len 1514
buf_len 2176, data_len 1514, ol_flags 0x180, data_off 128, phys_addr
0x80095600
packet_type 0x391 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
rss 0x0 fdir.hi 0x0 fdir.lo 0x0
Packet Offload Flags
PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
Packet Types
RTE_PTYPE_L2_ETHER (0x0001) Ethernet packet
RTE_PTYPE_L3_IPV4_EXT_UNKNOWN (0x0090) IPv4 packet with or without
extension headers
RTE_PTYPE_L4_FRAG (0x0300) Fragmented IP packet
IP4: 68:05:ca:3a:19:18 -> 3c:fd:fe:a9:cc:ed
ICMP: 10.1.1.1 -> 10.1.1.2
tos 0x00, ttl 64, length 1500, checksum 0x2eb6
fragment id 0x1067, flags MORE_FRAGMENTS
ICMP echo_request checksum 0x496a
00:04:02:492403: ip4-input-no-checksum
ICMP: 10.1.1.1 -> 10.1.1.2
tos 0x00, ttl 64, length 1500, checksum 0x2eb6
fragment id 0x1067, flags MORE_FRAGMENTS
ICMP echo_request checksum 0x496a
00:04:02:492406: ip4-reassembly-feature
reass id: 1000000118, op id: 0 first bi: 9558, data len: 1480, ip/fragment[0,
1479]
new range: [0, 1479], off 0, len 1480, bi 9558
reass id: 1000000118, op id: 2 first bi: 9558, data len: 2008, ip/fragment[0,
1479]
finalize reassembly
00:04:02:492434: ip4-lookup
fib 0 dpo-idx 5 flow hash: 0x00000000
ICMP: 10.1.1.1 -> 10.1.1.2
tos 0x00, ttl 64, length 2028, checksum 0x4ca6
fragment id 0x1067
ICMP echo_request checksum 0x496a
00:04:02:492435: ip4-local
ICMP: 10.1.1.1 -> 10.1.1.2
tos 0x00, ttl 64, length 2028, checksum 0x4ca6
fragment id 0x1067
ICMP echo_request checksum 0x496a
00:04:02:492436: ip4-icmp-input
ICMP: 10.1.1.1 -> 10.1.1.2
tos 0x00, ttl 64, length 2028, checksum 0x4ca6
fragment id 0x1067
ICMP echo_request checksum 0x496a
00:04:02:492436: ip4-icmp-echo-request
ICMP: 10.1.1.1 -> 10.1.1.2
tos 0x00, ttl 64, length 2028, checksum 0x4ca6
fragment id 0x1067
ICMP echo_request checksum 0x496a
00:04:02:492436: ip4-load-balance
fib 0 dpo-idx 13 flow hash: 0x00000000
ICMP: 10.1.1.2 -> 10.1.1.1
tos 0x00, ttl 64, length 2028, checksum 0x2d49
fragment id 0x2fc4
ICMP echo_reply checksum 0x516a
00:04:02:492436: ip4-rewrite
tx_sw_if_index 0 dpo-idx 1 : ipv4 via 10.1.1.1 TenGigabitEthernetaf/0/1:
mtu:1500 6805ca3a19183cfdfea9cced0800 flow hash: 0x05dc0000
00000000: 450007ec2fc4000040012d490a0101020a0101010000516a3ef600723f805a48
00000020: 00000000bd7c0c0000000000101112131415161718191a1b1c1d1e1f
00:04:02:492436: ip4-frag
IPv4 offset: 0 mtu: 1500 fragments: 1
00:04:02:492437: ip4-drop
ICMP: 10.1.1.2 -> 10.1.1.1
tos 0x00, ttl 64, length 2028, checksum 0x2d49
fragment id 0x2fc4
ICMP echo_reply checksum 0x516a
00:04:02:492437: error-drop
ip4-frag: malformed packet
Thanks,
Hongjun
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