tools/testing/selftests/net/xfrm_policy.sh

Source file repositories/reference/linux-study-clean/tools/testing/selftests/net/xfrm_policy.sh

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/net/xfrm_policy.sh
Extension
.sh
Size
15005 bytes
Lines
487
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Check xfrm policy resolution.  Topology:
#
# 1.2   1.1   3.1  3.10    2.1   2.2
# eth1  eth1 veth0 veth0 eth1   eth1
# ns1 ---- ns3 ----- ns4 ---- ns2
#
# ns3 and ns4 are connected via ipsec tunnel.
# pings from ns1 to ns2 (and vice versa) are supposed to work like this:
# ns1: ping 10.0.2.2: passes via ipsec tunnel.
# ns2: ping 10.0.1.2: passes via ipsec tunnel.

# ns1: ping 10.0.1.253: passes via ipsec tunnel (direct policy)
# ns2: ping 10.0.2.253: passes via ipsec tunnel (direct policy)
#
# ns1: ping 10.0.2.254: does NOT pass via ipsec tunnel (exception)
# ns2: ping 10.0.1.254: does NOT pass via ipsec tunnel (exception)

source lib.sh
ret=0
policy_checks_ok=1

KEY_SHA=0xdeadbeef1234567890abcdefabcdefabcdefabcd
KEY_AES=0x0123456789abcdef0123456789012345
SPI1=0x1
SPI2=0x2

do_esp_policy() {
    local ns=$1
    local me=$2
    local remote=$3
    local lnet=$4
    local rnet=$5

    # to encrypt packets as they go out (includes forwarded packets that need encapsulation)
    ip -net $ns xfrm policy add src $lnet dst $rnet dir out tmpl src $me dst $remote proto esp mode tunnel priority 100 action allow
    # to fwd decrypted packets after esp processing:
    ip -net $ns xfrm policy add src $rnet dst $lnet dir fwd tmpl src $remote dst $me proto esp mode tunnel priority 100 action allow
}

do_esp() {
    local ns=$1
    local me=$2
    local remote=$3
    local lnet=$4
    local rnet=$5
    local spi_out=$6
    local spi_in=$7

    ip -net $ns xfrm state add src $remote dst $me proto esp spi $spi_in  enc aes $KEY_AES  auth sha1 $KEY_SHA  mode tunnel sel src $rnet dst $lnet
    ip -net $ns xfrm state add src $me  dst $remote proto esp spi $spi_out enc aes $KEY_AES auth sha1 $KEY_SHA mode tunnel sel src $lnet dst $rnet

    do_esp_policy $ns $me $remote $lnet $rnet
}

# add policies with different netmasks, to make sure kernel carries
# the policies contained within new netmask over when search tree is
# re-built.
# peer netns that are supposed to be encapsulated via esp have addresses
# in the 10.0.1.0/24 and 10.0.2.0/24 subnets, respectively.
#
# Adding a policy for '10.0.1.0/23' will make it necessary to
# alter the prefix of 10.0.1.0 subnet.
# In case new prefix overlaps with existing node, the node and all
# policies it carries need to be merged with the existing one(s).
#
# Do that here.
do_overlap()

Annotation

Implementation Notes