VPP/IPSec and IKEv2

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This page describes the support in the VPP platform for IPSec and IKEv2.

IPSec

Features

This implementation of support for IPSec in the VPP engine includes the following features:

  • ESP - Encapsulating Security Payload protocol
  • Tunnel mode - encapsulates the entire IP packet
  • Transport mode - encapsulates IP payload
  • IPv4 and IPv6

Supported cryptographic algorithms for authentication:

  • sha1
  • sha-256-96
  • sha-256-128
  • sha-384-192
  • sha-512-256

Supported cryptographic algorithms for encryption:

  • aes-cbc-128
  • aes-cbc-192
  • aes-cbc-256

Configuration

SPD creation

The following example command shows the configuration sequence to create a Security Policy Database (SPD):

CLI commands

ipsec spd add 1

VAT commands

ipsec_spd_add_del spd_id 1

Enable SPD on an interface

The following example command shows the configuration sequence to enable SPD on an interface:

CLI commands

set interface ipsec spd GigabitEthernet0/6/0 1

VAT commands

ipsec_interface_add_del_spd GigabitEthernet0/5/0 spd_id 1

SA creation

The following example command shows the configuration sequence to create a Security Association (SA) for Tunnel mode:

CLI commands

ipsec sa add 10 spi 1001 esp crypto-key 4a506a794f574265564551694d653768 crypto-alg aes-cbc-128 integ-key 4339314b55523947594d6d3547666b45764e6a58 integ-alg sha1-96 tunnel-src 192.168.100.3 tunnel-dst 192.168.100.2

VAT commands

ipsec_sad_add_del_entry esp sad_id 10 spi 1001 crypto_alg aes-cbc-128 crypto_key 4a506a794f574265564551694d653768 integ_alg sha1-96 integ_key 4339314b55523947594d6d3547666b45764e6a58 tunnel_src 192.168.100.3 tunnel_dst 192.168.100.2

The following example command shows the configuration sequence to create a SA for Transport mode:

CLI commands

ipsec sa add 10 spi 1001 esp crypto-key 4a506a794f574265564551694d653768 crypto-alg aes-cbc-128 integ-key 4339314b55523947594d6d3547666b45764e6a58 integ-alg sha1-96

VAT commands

ipsec_sad_add_del_entry esp sad_id 10 spi 1001 crypto_alg aes-cbc-128 crypto_key 4a506a794f574265564551694d653768 integ_alg sha1-96 integ_key 4339314b55523947594d6d3547666b45764e6a58

SPD entry creation

Parameters:

  • spd <id> - SPD identifier
  • priority - policy order in SPD, signed integer
  • inbound|outbound - policy is for inbound or outbound traffic
  • action bypass|discard|protect - policy action, protect action needs aditional parameter "sa <id>"

Traffic selectors (optional parameters):

  • local-ip-range <start_ip_addr> - <end_ip_addr>
  • remote-ip-range <start_ip_addr> - <end_ip_addr>
  • protocol <n>
  • local-port-range <start_port> - <end_port> (only for TCP/UDP protocol)
  • remote-port-range <start_port> - <end_port> (only for TCP/UDP protocol)

The following example commands show the configuration sequence to create a SPD entry:

CLI commands

ipsec policy add spd 1 inbound priority 10 action protect sa 20 local-ip-range 192.168.4.4 - 192.168.4.4 remote-ip-range 192.168.3.3 - 192.168.3.3

VAT commands

ipsec_spd_add_del_entry spd_id 1 priority 10 inbound action protectsa_id 20 laddr_start 192.168.4.4 laddr_stop 192.168.4.4 raddr_start 192.168.3.3 raddr_stop 192.168.3.3

show ipsec

You can display IPSec SA a SPD using:

show ipsec
sa 10 spi 1001 mode transport protocol esp
  crypto alg aes-cbc-128 key 4a506a794f574265564551694d653768 integrity alg sha1-96 key 4339314b55523947594d6d3547666b45764e6a58
sa 20 spi 1000 mode transport protocol esp
  crypto alg aes-cbc-128 key 4a506a794f574265564551694d653768 integrity alg sha1-96 key 4339314b55523947594d6d3547666b45764e6a58
spd 1
 outbound policies
  priority 100 action bypass protocol IPSEC_ESP
   local addr range 0.0.0.0 - 255.255.255.255 port range 0 - 65535
   remte addr range 0.0.0.0 - 255.255.255.255 port range 0 - 65535
   packets 0 bytes 0
  priority 100 action bypass protocol IPSEC_ESP
   local addr range 0.0.0.0 - 255.255.255.255 port range 0 - 65535
   remte addr range 0.0.0.0 - 255.255.255.255 port range 0 - 65535
   packets 0 bytes 0
  priority 10 action protect protocol any sa 10
   local addr range 192.168.100.3 - 192.168.100.3 port range 0 - 65535
   remte addr range 192.168.100.2 - 192.168.100.2 port range 0 - 65535
   packets 9 bytes 756
  priority 100 action bypass protocol IPSEC_ESP
   local addr range :: - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff port range 0 - 65535
   remote addr range :: - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff port range 0 - 65535
   packets 0 bytes 0
  priority 100 action bypass protocol IPSEC_ESP
   local addr range :: - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff port range 0 - 65535
   remote addr range :: - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff port range 0 - 65535
   packets 0 bytes 0
 inbound policies
  priority 10 action protect protocol any sa 20
   local addr range 192.168.100.3 - 192.168.100.3 port range 0 - 65535
   remte addr range 192.168.100.2 - 192.168.100.2 port range 0 - 65535
   packets 9 bytes 1224
  priority 100 action bypass protocol IPSEC_ESP
   local addr range 0.0.0.0 - 255.255.255.255 port range 0 - 65535
   remte addr range 0.0.0.0 - 255.255.255.255 port range 0 - 65535
   packets 0 bytes 0
  priority 100 action bypass protocol IPSEC_ESP
   local addr range 0.0.0.0 - 255.255.255.255 port range 0 - 65535
   remte addr range 0.0.0.0 - 255.255.255.255 port range 0 - 65535
   packets 0 bytes 0
  priority 100 action bypass protocol IPSEC_ESP
   local addr range :: - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff port range 0 - 65535
   remote addr range :: - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff port range 0 - 65535
   packets 0 bytes 0
  priority 100 action bypass protocol IPSEC_ESP
   local addr range :: - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff port range 0 - 65535
   remote addr range :: - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff port range 0 - 65535
   packets 0 bytes 0

SA key update

The following example command shows the configuration sequence to update a Security Association (SA) keys:

CLI commands

set ipsec sa 10 crypto-key 4a506a794f574265564551694d653768 integ-key 4339314b55523947594d6d3547666b45764e6a58

VAT commands

ipsec_sa_set_key sa_id 10 crypto_key 4a506a794f574265564551694d653768 integ_key 4339314b55523947594d6d3547666b45764e6a58

Example configuration

This section covers using manually-keyed IPSec connections between VPP and native IPSec stack in the 2.6 kernel series (Ubuntu 14.04) in ESP transport mode.

Prerequisite

Install ipsec-tools on Ubuntu:

$ sudo apt-get install ipsec-tools

Network Topology

+--------------------+                    +-------------------------+
|Ubuntu              |   +------------+   |                      VPP|
|                eth3|---|IPSec tunnel|---|GigabitEthernet0/8/0     |
|       192.168.100.2|   +------------+   |192.168.100.3            |
|                    |                    |                         |
+--------------------+                    +-------------------------+             

VPP configuration

CLI commands

set int ip address GigabitEthernet0/8/0 192.168.100.3/24
set int state GigabitEthernet0/8/0 up
set ip arp GigabitEthernet0/8/0 192.168.100.2 08:00:27:12:3c:cc
ipsec sa add 10 spi 1001 esp crypto-alg aes-cbc-128 crypto-key 4a506a794f574265564551694d653768 integ-alg sha1-96 integ-key 4339314b55523947594d6d3547666b45764e6a58
ipsec sa add 20 spi 1000 esp crypto-alg aes-cbc-128 crypto-key 4a506a794f574265564551694d653768 integ-alg sha1-96 integ-key 4339314b55523947594d6d3547666b45764e6a58
ipsec spd add 1
set interface ipsec spd GigabitEthernet0/8/0 1
ipsec policy add spd 1 priority 100 inbound action bypass protocol 50
ipsec policy add spd 1 priority 100 outbound action bypass protocol 50
ipsec policy add spd 1 priority 10 inbound action protect sa 20 local-ip-range 192.168.100.3 - 192.168.100.3 remote-ip-range 192.168.100.2 - 192.168.100.2
ipsec policy add spd 1 priority 10 outbound action protect sa 10 local-ip-range 192.168.100.3 - 192.168.100.3 remote-ip-range 192.168.100.2 - 192.168.100.2

VAT commands

sw_interface_add_del_address sw_if_index 1 192.168.100.3/24
sw_interface_set_flags sw_if_index 1 admin-up
ip_neighbor_add_del sw_if_index 1 dst 192.168.100.2 mac 08:00:27:12:3c:cc
ipsec_sad_add_del_entry esp sad_id 10 spi 1001 crypto_alg aes-cbc-128 crypto_key 4a506a794f574265564551694d653768 integ_alg sha1-96 integ_key 4339314b55523947594d6d3547666b45764e6a58
ipsec_sad_add_del_entry esp sad_id 20 spi 1000 crypto_alg aes-cbc-128 crypto_key 4a506a794f574265564551694d653768 integ_alg sha1-96 integ_key 4339314b55523947594d6d3547666b45764e6a58
ipsec_spd_add_del spd_id 1
ipsec_interface_add_del_spd sw_if_index 1 spd_id 1
ipsec_spd_add_del_entry spd_id 1 priority 100 inbound action bypass protocol 50
ipsec_spd_add_del_entry spd_id 1 priority 100 outbound action bypass protocol 50
ipsec_spd_add_del_entry spd_id 1 priority 10 inbound action protectsa_id 20 laddr_start 192.168.100.3 laddr_stop 192.168.100.3 raddr_start 192.168.100.2 raddr_stop 192.168.100.2
ipsec_spd_add_del_entry spd_id 1 priority 10 outbound action protectsa_id 10 laddr_start 192.168.100.3 laddr_stop 192.168.100.3 raddr_start 192.168.100.2 raddr_stop 192.168.100.2

Ubuntu configuration

Edit /etc/ipsec-tools.conf file:

# Configuration for 192.168.100.2

# Flush the SAD and SPD
flush;
spdflush;

# ESP SAs
add 192.168.100.2 192.168.100.3 esp 0x000003e8 -E rijndael-cbc
        0x4a506a794f574265564551694d653768
        -A hmac-sha1 0x4339314b55523947594d6d3547666b45764e6a58;
add 192.168.100.3 192.168.100.2 esp 0x000003e9 -E rijndael-cbc
        0x4a506a794f574265564551694d653768
        -A hmac-sha1 0x4339314b55523947594d6d3547666b45764e6a58;

# Security policies
spdadd 192.168.100.2 192.168.100.3 any -P out ipsec
           esp/transport//require;

spdadd 192.168.100.3 192.168.100.2 any -P in ipsec
           esp/transport//require;

Set interface, static ARP and start IPSec:

$ sudo ifconfig eth3 192.168.100.2 netmask 255.255.255.0 up
$ sudo arp -s 192.168.100.3 08:00:27:43:a9:5b 
$ sudo /etc/init.d/setkey start

Verification

ping output:

$ ping 192.168.100.3 -c 2
PING 192.168.100.3 (192.168.100.3) 56(84) bytes of data.
64 bytes from 192.168.100.3: icmp_seq=1 ttl=254 time=0.368 ms
64 bytes from 192.168.100.3: icmp_seq=2 ttl=254 time=0.284 ms

--- 192.168.100.3 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 0.284/0.326/0.368/0.042 ms

tcpdump output:

$ sudo tcpdump -vvn -i eth3
tcpdump: listening on eth3, link-type EN10MB (Ethernet), capture size 65535 bytes
04:12:02.197589 IP (tos 0x0, ttl 64, id 19395, offset 0, flags [DF], proto ESP (50), length 136)
    192.168.100.2 > 192.168.100.3: ESP(spi=0x000003e8,seq=0x6), length 116
04:12:02.197939 IP (tos 0x0, ttl 254, id 0, offset 0, flags [none], proto ESP (50), length 136)
    192.168.100.3 > 192.168.100.2: ESP(spi=0x000003e9,seq=0x6), length 116
04:12:03.198067 IP (tos 0x0, ttl 64, id 19641, offset 0, flags [DF], proto ESP (50), length 136)
    192.168.100.2 > 192.168.100.3: ESP(spi=0x000003e8,seq=0x7), length 116
04:12:03.198325 IP (tos 0x0, ttl 254, id 0, offset 0, flags [none], proto ESP (50), length 136)
    192.168.100.3 > 192.168.100.2: ESP(spi=0x000003e9,seq=0x7), length 116

VPP error counters:

vpp# show error
   Count                    Node                  Reason
         2              ipsec-output              IPSec policy protect
         2               esp-decrypt              ESP pkts received
         2               esp-encrypt              ESP pkts received
         2             ipsec-input-ip4            IPSEC pkts received
         2             ip4-icmp-input             echo replies sent

IKEv2

VPP engine IKEv2 implmentation works only as responder.

Features

This implementation of support for IKEv2 in the VPP engine includes the following features:

Exchange Types
Number Name
34 IKE SA init
35 IKE auth
36 Create child SA
37 Informational
Payload Types
Number Name
0 No next payload
33 Security Association (SA)
34 Key Exchange (KE)
35 Identification - Initiator (IDi)
36 Identification - Responder (IDr)
39 Authentication (AUTH)
40 Nonce (Ni, Nr)
41 Notify (N)
42 Delete (D)
43 Vendor ID (V)
44 Traffic Selector - Initiator (TSi)
45 Traffic Selector - Responder (TSr)
46 Encrypted and Authenticated (SK)
Transform Type Values
Number Name
1 Encryption Algorithm (ENCR)
2 Pseudo-random Function (PRF)
3 Integrity Algorithm (INTEG)
4 Diffie-Hellman Group (D-H)
5 Extended Sequence Numbers (ESN)
Encryption Algorithm
Number Name
12 AES-CBC (128/192/256)
Pseudo-random Function
Number Name
1 HMAC-SHA1
Integrity Algorithm
Number Name
2 HMAC-SHA1-96
Diffie-Hellman Group
Number Name
1 768bit MODP
2 1024bit MODP
5 1536bit MODP
14 2048bit MODP
15 3072bit MODP
16 4096bit MODP
17 6144bit MODP
18 8192bit MODP
19 256bit random ECP
20 384bit random ECP
21 521bit random ECP
22 1024bit MODP with 160bit prime order group
23 2048bit MODP with 224bit prime order group
24 2048bit MODP with 256bit prime order group
25 192bit random ECP
Extended Sequence Numbers
Number Name
0 No ESN
1 ESN
ID Types
Number Name
1 IPv4 address
2 FQDN
3 RFC822
11 Key ID
Authentication Method
Number Name
1 RSA digital signature
2 Shared key message integrity code
Traffic Selector Types
Number Name
7 IPv4 address range
Security Protocol Identifiers
Number Name
1 IKE
3 ESP


Configuration

Profile creation

The following example command shows the configuration sequence to create a IKEv2 profile:

CLI commands

ikev2 profile add profile1

VAT commands

ikev2_profile_add_del name profile1

Authentication

The following example command shows the configuration sequence to set a IKEv2 profile authentication shared-key-mic string format:

CLI commands

ikev2 profile set profile1 auth shared-key-mic string Vpp123

VAT commands

ikev2_profile_set_auth name profile1 auth_method shared-key-mic auth_data Vpp123

The following example command shows the configuration sequence to set a IKEv2 profile authentication shared-key-mic hex format:

CLI commands

ikev2 profile set profile1 auth shared-key-mic hex abcd1234

VAT commands

ikev2_profile_set_auth name profile1 auth_method shared-key-mic auth_data 0xabcd1234

The following example command shows the configuration sequence to set a IKEv2 profile authentication rsa-sig:

CLI commands

ikev2 profile set profile1 auth rsa-sig cert-file /home/localadmin/certs/server-cert.pem
set ikev2 local key /home/localadmin/certs/client-key.pem

VAT commands

ikev2_profile_set_auth name profile1 auth_method rsa-sig auth_data /home/localadmin/certs/server-cert.pem
ikev2_set_local_key file /home/localadmin/certs/client-key.pem

ID

The following example command shows the configuration sequence to set a IKEv2 profile remote ID IPv4 address:

CLI commands

ikev2 profile set profile1 id remote ip4-addr 192.168.123.20

VAT commands

ikev2_profile_set_id name profile1 id_type ip4-addr id_data 192.168.123.20 remote

The following example command shows the configuration sequence to set a IKEv2 profile local ID FQDN:

CLI commands

ikev2 profile set profile1 id local fqdn vpp.home

VAT commands

ikev2_profile_set_id name profile1 id_type fqdn id_data vpp.home local

The following example command shows the configuration sequence to set a IKEv2 profile local ID key-id:

CLI commands

ikev2 profile set profile1 id local key-id 0xabcd

VAT commands

ikev2_profile_set_id name profile2 id_type key-id id_data 0xabcd local

The following example command shows the configuration sequence to set a IKEv2 profile local ID rfc822 (email address):

CLI commands

ikev2 profile set profile1 id local rfc822 vpp@vvp.home

VAT commands

ikev2_profile_set_id name profile2 id_type rfc822 id_data vpp@vvp.home local

Traffic Selector

The following example command shows the configuration sequence to set a IKEv2 profile traffic selector:

CLI commands

ikev2 profile set profile1 traffic-selector local ip-range 192.168.124.0 - 192.168.124.255 port-range 0 - 65535 protocol 0
ikev2 profile set profile1 traffic-selector remote ip-range 192.168.125.0 - 192.168.125.255 port-range 0 - 65535 protocol 0

VAT commands

ikev2_profile_set_ts name profile1 protocol 0 start_port 0 end_port 65535 start_addr 192.168.124.0 end_addr 192.168.124.255 local
ikev2_profile_set_ts name profile1 protocol 0 start_port 0 end_port 65535 start_addr 192.168.125.0 end_addr 192.168.125.255 remote

show ikev2 sa

You can display IKEv2 profiles using:

show ikev2 sa
profile pr1
  auth-method shared-key-mic auth data Vpp123
  local id-type fqdn data vpp.home
  remote id-type fqdn data roadwarrior.vpn.example.com
  local traffic-selector addr 192.168.124.0 - 192.168.124.255 port 0 - 65535 protocol 0
  remote traffic-selector addr 192.168.125.0 - 192.168.125.255 port 0 - 65535 protocol 0

Example configuration

This section covers IKEv2 connection between VPP and strongswan.

Prerequisite

Install strongswan on Ubuntu:

$ sudo apt-get install strongswan

VPP configuration

CLI commands

set int state GigabitEthernet0/8/0 up
set int ip address GigabitEthernet0/8/0 192.168.100.3/24
ikev2 profile add pr1
ikev2 profile set pr1 auth shared-key-mic string Vpp123
ikev2 profile set pr1 id local fqdn vpp.home
ikev2 profile set pr1 id remote fqdn roadwarrior.vpn.example.com
ikev2 profile set pr1 traffic-selector local ip-range 192.168.124.0 - 192.168.124.255 port-range 0 - 65535 protocol 0
ikev2 profile set pr1 traffic-selector remote ip-range 192.168.125.0 - 192.168.125.255 port-range 0 - 65535 protocol 0

VAT commands

sw_interface_add_del_address sw_if_index 1 192.168.100.3/24
sw_interface_set_flags sw_if_index 1 admin-up
ikev2_profile_add_del name pr1
ikev2_profile_set_auth name pr1 auth_method shared-key-mic auth_data Vpp123
ikev2_profile_set_id name pr1 id_type fqdn id_data vpp.home local
ikev2_profile_set_id name pr1 id_type fqdn id_data roadwarrior.vpn.example.com remote
ikev2_profile_set_ts name pr1 protocol 0 start_port 0 end_port 65535 start_addr 192.168.124.0 end_addr 192.168.124.255 local
ikev2_profile_set_ts name pr1 protocol 0 start_port 0 end_port 65535 start_addr 192.168.125.0 end_addr 192.168.125.255 remote

Strongswan configuration

Set interface address:

$ sudo ifconfig eth3 192.168.100.2 netmask 255.255.255.0 up

Edit /etc/ipsec.conf file:

config setup
        strictcrlpolicy=no

conn %default
        ike=aes256-sha1-modp2048!
        esp=aes192-sha1-esn!
        mobike=no
        keyexchange=ikev2
        ikelifetime=24h
        lifetime=24h

conn net-net
        right=192.168.100.3
        rightsubnet=192.168.124.0/24
        rightauth=psk
        rightid=@vpp.home
        left=192.168.100.2
        leftsubnet=192.168.125.0/24
        leftauth=psk
        leftid=@roadwarrior.vpn.example.com
        auto=start

Edit /etc/ipsec.secrets file:

: PSK "Vpp123"

Verification

Start strongswan:

$ sudo ipsec start

Show strongswan status:

$ sudo ipsec statusall
Status of IKE charon daemon (strongSwan 5.1.2, Linux 3.16.0-30-generic, x86_64):
  uptime: 98 seconds, since Aug 01 05:49:29 2016
  malloc: sbrk 2162688, mmap 0, used 343648, free 1819040
  worker threads: 11 of 16 idle, 5/0/0/0 working, job queue: 0/0/0/0, scheduled: 2
  loaded plugins: charon test-vectors aes rc2 sha1 sha2 md4 md5 rdrand random nonce x509 revocation constraints pkcs1 pkcs7 pkcs8 pkcs12 pem openssl xcbc cmac hmac ctr ccm gcm attr kernel-netlink resolve socket-default stroke updown eap-identity addrblock
Listening IP addresses:
  10.0.2.15
  192.168.100.2
  192.168.3.3
Connections:
     net-net:  192.168.100.2...192.168.100.3  IKEv2
     net-net:   local:  [roadwarrior.vpn.example.com] uses pre-shared key authentication
     net-net:   remote: [vpp.home] uses pre-shared key authentication
     net-net:   child:  192.168.125.0/24 === 192.168.124.0/24 TUNNEL
Security Associations (1 up, 0 connecting):
     net-net[1]: ESTABLISHED 98 seconds ago, 192.168.100.2[roadwarrior.vpn.example.com]...192.168.100.3[vpp.home]
     net-net[1]: IKEv2 SPIs: 0f67b83d6e53310a_i* b0bfbfe3b873c7af_r, pre-shared key reauthentication in 23 hours
     net-net[1]: IKE proposal: AES_CBC_256/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_2048
     net-net{1}:  INSTALLED, TUNNEL, ESP SPIs: cbf74e7b_i 117dc2e1_o
     net-net{1}:  AES_CBC_192/HMAC_SHA1_96/ESN, 0 bytes_i, 0 bytes_o, rekeying in 23 hours
     net-net{1}:   192.168.125.0/24 === 192.168.124.0/24

VPP IKEv2 status:

vpp# show ikev2 sa
 iip 192.168.100.2 ispi a31536e3db8670f rip 192.168.100.3 rspi afc773b8e3bfbfb0
 encr:aes-cbc-256 prf:hmac-sha1 integ:sha1-96 dh-group:modp-2048
  nonce i:91ce22374a5eb57903ce3c7accab6a697b7c77edabee71d0f8d4933fa5be36de
        r:78e83bf1889891d07e5aef522568f84d9ba2feee94f6a0c8e93c4c0b6cf3fdc7
  SK_d    9e731d25b49d4586b9ee029040af1c53d3b0a463
  SK_a  i:a65a66517ba183e5afe10a3f437462033907fe81
        r:a3ee4af9abb8ea87ebd2d36c9f92b56cae0adc51
  SK_e  i:245203c55c2c1d476e4977351ac5aacab995420bd4f4a5bae36530c0b481c2d5
        r:8f4a1d4d50bb7152bad52f59719e3764d55d72aa9765f02f5496b115dc3bc7f1
  SK_p  i:3182ff3e52efaf3c951114b949d8751d491b0f09
        r:431e2453cc8fe5accbbdd3efcb44642c961f60a8
  identifier (i) fqdn roadwarrior.vpn.example.com
  identifier (r) fqdn vpp.home
  child sa 0:
    encr:aes-cbc-192 integ:sha1-96 esn:yes
    spi(i) cbf74e7b spi(r) 117dc2e1
    SK_e  i:5dad89b09ddcb6ef62b08e390c8cccec4fadbd81fdfee6df
          r:4ec5b4adb6a27ef95bd9281c4090c0a6a131f574d4ed3a9d
    SK_a  i:45fa72c50b05517f744651b2e236e38651f54407
          r:71e6dabf7d8325f3bae7e42ca40b4a491a2a1d84
    traffic selectors (i):
      0 type 7 protocol_id 0 addr 192.168.125.0 - 192.168.125.255 port 0 - 65535
    traffic selectors (r):
      0 type 7 protocol_id 0 addr 192.168.124.0 - 192.168.124.255 port 0 - 65535
 iip 192.168.100.2 ispi a31536e3db8670f rip 192.168.100.3 rspi afc773b8e3bfbfb0

VPP create ipsec tunnel interface when IKEv2 connection is established and child SA created.

vpp# show interface
              Name               Idx       State          Counter          Count
GigabitEthernet0/8/0              1         up       rx packets                     8
                                                     rx bytes                    1318
                                                     tx packets                     7
                                                     tx bytes                    1098
                                                     drops                          1
                                                     ip4                            7
GigabitEthernet0/9/0              2        down
ipsec0                            3        down

You can see ipsec tunnel interface details:

vpp# show ipsec
tunnel interfaces
  ipsec0 seq
   seq 1 seq-hi 0 esn 1 anti-replay 1
   local-spi 3421982331 local-ip 192.168.100.3
   local-crypto aes-cbc-192 4ec5b4adb6a27ef95bd9281c4090c0a6a131f574d4ed3a9d
   local-integrity sha1-96 71e6dabf7d8325f3bae7e42ca40b4a491a2a1d84
   last-seq 0 last-seq-hi 0 esn 1 anti-replay 1 window 0000000000000000000000000000000000000000000000000000000000000000
   remote-spi 293454561 remote-ip 192.168.100.2
   remote-crypto aes-cbc-192 5dad89b09ddcb6ef62b08e390c8cccec4fadbd81fdfee6df
   remote-integrity sha1-96 45fa72c50b05517f744651b2e236e38651f54407