Skip to content

L
linux
Commit 0fde56e4 authored by Peter Oskolkov's avatar Peter Oskolkov Committed by Alexei Starovoitov
Browse files
Options

selftests: bpf: add test_lwt_ip_encap selftest 

This patch adds a bpf self-test to cover BPF_LWT_ENCAP_IP mode
in bpf_lwt_push_encap.

Covered:
- encapping in LWT_IN and LWT_XMIT
- IPv4 and IPv6

A follow-up patch will add GSO and VRF-enabled tests.
Signed-off-by: default avatarPeter Oskolkov <posk@google.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 755db477
Show whitespace changes
Inline Side-by-side
Showing with 398 additions and 1 deletion
tools/testing/selftests/bpf/Makefile
View file @ 0fde56e4
......@@ -50,7 +50,8 @@ TEST_PROGS := test_kmod.sh \
test_lirc_mode2.sh \
test_skb_cgroup_id.sh \
test_flow_dissector.sh \
test_xdp_vlan.sh
test_xdp_vlan.sh \
test_lwt_ip_encap.sh
TEST_PROGS_EXTENDED := with_addr.sh \
with_tunnels.sh \
......
tools/testing/selftests/bpf/progs/test_lwt_ip_encap.c 0 → 100644
View file @ 0fde56e4
// SPDX-License-Identifier: GPL-2.0
#include <stddef.h>
#include <string.h>
#include <linux/bpf.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include "bpf_helpers.h"
#include "bpf_endian.h"
struct grehdr {
__be16 flags;
__be16 protocol;
};
SEC("encap_gre")
int bpf_lwt_encap_gre(struct __sk_buff *skb)
{
struct encap_hdr {
struct iphdr iph;
struct grehdr greh;
} hdr;
int err;
memset(&hdr, 0, sizeof(struct encap_hdr));
hdr.iph.ihl = 5;
hdr.iph.version = 4;
hdr.iph.ttl = 0x40;
hdr.iph.protocol = 47; /* IPPROTO_GRE */
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
hdr.iph.saddr = 0x640110ac; /* 172.16.1.100 */
hdr.iph.daddr = 0x641010ac; /* 172.16.16.100 */
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
hdr.iph.saddr = 0xac100164; /* 172.16.1.100 */
hdr.iph.daddr = 0xac101064; /* 172.16.16.100 */
#else
#error "Fix your compiler's __BYTE_ORDER__?!"
#endif
hdr.iph.tot_len = bpf_htons(skb->len + sizeof(struct encap_hdr));
hdr.greh.protocol = skb->protocol;
err = bpf_lwt_push_encap(skb, BPF_LWT_ENCAP_IP, &hdr,
sizeof(struct encap_hdr));
if (err)
return BPF_DROP;
return BPF_LWT_REROUTE;
}
SEC("encap_gre6")
int bpf_lwt_encap_gre6(struct __sk_buff *skb)
{
struct encap_hdr {
struct ipv6hdr ip6hdr;
struct grehdr greh;
} hdr;
int err;
memset(&hdr, 0, sizeof(struct encap_hdr));
hdr.ip6hdr.version = 6;
hdr.ip6hdr.payload_len = bpf_htons(skb->len + sizeof(struct grehdr));
hdr.ip6hdr.nexthdr = 47; /* IPPROTO_GRE */
hdr.ip6hdr.hop_limit = 0x40;
/* fb01::1 */
hdr.ip6hdr.saddr.s6_addr[0] = 0xfb;
hdr.ip6hdr.saddr.s6_addr[1] = 1;
hdr.ip6hdr.saddr.s6_addr[15] = 1;
/* fb10::1 */
hdr.ip6hdr.daddr.s6_addr[0] = 0xfb;
hdr.ip6hdr.daddr.s6_addr[1] = 0x10;
hdr.ip6hdr.daddr.s6_addr[15] = 1;
hdr.greh.protocol = skb->protocol;
err = bpf_lwt_push_encap(skb, BPF_LWT_ENCAP_IP, &hdr,
sizeof(struct encap_hdr));
if (err)
return BPF_DROP;
return BPF_LWT_REROUTE;
}
char _license[] SEC("license") = "GPL";
tools/testing/selftests/bpf/test_lwt_ip_encap.sh 0 → 100755
View file @ 0fde56e4
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Setup/topology:
#
# NS1 NS2 NS3
# veth1 <---> veth2 veth3 <---> veth4 (the top route)
# veth5 <---> veth6 veth7 <---> veth8 (the bottom route)
#
# each vethN gets IPv[4|6]_N address
#
# IPv*_SRC = IPv*_1
# IPv*_DST = IPv*_4
#
# all tests test pings from IPv*_SRC to IPv*_DST
#
# by default, routes are configured to allow packets to go
# IP*_1 <=> IP*_2 <=> IP*_3 <=> IP*_4 (the top route)
#
# a GRE device is installed in NS3 with IPv*_GRE, and
# NS1/NS2 are configured to route packets to IPv*_GRE via IP*_8
# (the bottom route)
#
# Tests:
#
# 1. routes NS2->IPv*_DST are brought down, so the only way a ping
# from IP*_SRC to IP*_DST can work is via IPv*_GRE
#
# 2a. in an egress test, a bpf LWT_XMIT program is installed on veth1
# that encaps the packets with an IP/GRE header to route to IPv*_GRE
#
# ping: SRC->[encap at veth1:egress]->GRE:decap->DST
# ping replies go DST->SRC directly
#
# 2b. in an ingress test, a bpf LWT_IN program is installed on veth2
# that encaps the packets with an IP/GRE header to route to IPv*_GRE
#
# ping: SRC->[encap at veth2:ingress]->GRE:decap->DST
# ping replies go DST->SRC directly
set -e # exit on error
if [[ $EUID -ne 0 ]]; then
echo "This script must be run as root"
echo "FAIL"
exit 1
fi
readonly NS1="ns1-$(mktemp -u XXXXXX)"
readonly NS2="ns2-$(mktemp -u XXXXXX)"
readonly NS3="ns3-$(mktemp -u XXXXXX)"
readonly IPv4_1="172.16.1.100"
readonly IPv4_2="172.16.2.100"
readonly IPv4_3="172.16.3.100"
readonly IPv4_4="172.16.4.100"
readonly IPv4_5="172.16.5.100"
readonly IPv4_6="172.16.6.100"
readonly IPv4_7="172.16.7.100"
readonly IPv4_8="172.16.8.100"
readonly IPv4_GRE="172.16.16.100"
readonly IPv4_SRC=$IPv4_1
readonly IPv4_DST=$IPv4_4
readonly IPv6_1="fb01::1"
readonly IPv6_2="fb02::1"
readonly IPv6_3="fb03::1"
readonly IPv6_4="fb04::1"
readonly IPv6_5="fb05::1"
readonly IPv6_6="fb06::1"
readonly IPv6_7="fb07::1"
readonly IPv6_8="fb08::1"
readonly IPv6_GRE="fb10::1"
readonly IPv6_SRC=$IPv6_1
readonly IPv6_DST=$IPv6_4
setup() {
set -e # exit on error
# create devices and namespaces
ip netns add "${NS1}"
ip netns add "${NS2}"
ip netns add "${NS3}"
ip link add veth1 type veth peer name veth2
ip link add veth3 type veth peer name veth4
ip link add veth5 type veth peer name veth6
ip link add veth7 type veth peer name veth8
ip netns exec ${NS2} sysctl -wq net.ipv4.ip_forward=1
ip netns exec ${NS2} sysctl -wq net.ipv6.conf.all.forwarding=1
ip link set veth1 netns ${NS1}
ip link set veth2 netns ${NS2}
ip link set veth3 netns ${NS2}
ip link set veth4 netns ${NS3}
ip link set veth5 netns ${NS1}
ip link set veth6 netns ${NS2}
ip link set veth7 netns ${NS2}
ip link set veth8 netns ${NS3}
# configure addesses: the top route (1-2-3-4)
ip -netns ${NS1} addr add ${IPv4_1}/24 dev veth1
ip -netns ${NS2} addr add ${IPv4_2}/24 dev veth2
ip -netns ${NS2} addr add ${IPv4_3}/24 dev veth3
ip -netns ${NS3} addr add ${IPv4_4}/24 dev veth4
ip -netns ${NS1} -6 addr add ${IPv6_1}/128 nodad dev veth1
ip -netns ${NS2} -6 addr add ${IPv6_2}/128 nodad dev veth2
ip -netns ${NS2} -6 addr add ${IPv6_3}/128 nodad dev veth3
ip -netns ${NS3} -6 addr add ${IPv6_4}/128 nodad dev veth4
# configure addresses: the bottom route (5-6-7-8)
ip -netns ${NS1} addr add ${IPv4_5}/24 dev veth5
ip -netns ${NS2} addr add ${IPv4_6}/24 dev veth6
ip -netns ${NS2} addr add ${IPv4_7}/24 dev veth7
ip -netns ${NS3} addr add ${IPv4_8}/24 dev veth8
ip -netns ${NS1} -6 addr add ${IPv6_5}/128 nodad dev veth5
ip -netns ${NS2} -6 addr add ${IPv6_6}/128 nodad dev veth6
ip -netns ${NS2} -6 addr add ${IPv6_7}/128 nodad dev veth7
ip -netns ${NS3} -6 addr add ${IPv6_8}/128 nodad dev veth8
ip -netns ${NS1} link set dev veth1 up
ip -netns ${NS2} link set dev veth2 up
ip -netns ${NS2} link set dev veth3 up
ip -netns ${NS3} link set dev veth4 up
ip -netns ${NS1} link set dev veth5 up
ip -netns ${NS2} link set dev veth6 up
ip -netns ${NS2} link set dev veth7 up
ip -netns ${NS3} link set dev veth8 up
# configure routes: IP*_SRC -> veth1/IP*_2 (= top route) default;
# the bottom route to specific bottom addresses
# NS1
# top route
ip -netns ${NS1} route add ${IPv4_2}/32 dev veth1
ip -netns ${NS1} route add default dev veth1 via ${IPv4_2} # go top by default
ip -netns ${NS1} -6 route add ${IPv6_2}/128 dev veth1
ip -netns ${NS1} -6 route add default dev veth1 via ${IPv6_2} # go top by default
# bottom route
ip -netns ${NS1} route add ${IPv4_6}/32 dev veth5
ip -netns ${NS1} route add ${IPv4_7}/32 dev veth5 via ${IPv4_6}
ip -netns ${NS1} route add ${IPv4_8}/32 dev veth5 via ${IPv4_6}
ip -netns ${NS1} -6 route add ${IPv6_6}/128 dev veth5
ip -netns ${NS1} -6 route add ${IPv6_7}/128 dev veth5 via ${IPv6_6}
ip -netns ${NS1} -6 route add ${IPv6_8}/128 dev veth5 via ${IPv6_6}
# NS2
# top route
ip -netns ${NS2} route add ${IPv4_1}/32 dev veth2
ip -netns ${NS2} route add ${IPv4_4}/32 dev veth3
ip -netns ${NS2} -6 route add ${IPv6_1}/128 dev veth2
ip -netns ${NS2} -6 route add ${IPv6_4}/128 dev veth3
# bottom route
ip -netns ${NS2} route add ${IPv4_5}/32 dev veth6
ip -netns ${NS2} route add ${IPv4_8}/32 dev veth7
ip -netns ${NS2} -6 route add ${IPv6_5}/128 dev veth6
ip -netns ${NS2} -6 route add ${IPv6_8}/128 dev veth7
# NS3
# top route
ip -netns ${NS3} route add ${IPv4_3}/32 dev veth4
ip -netns ${NS3} route add ${IPv4_1}/32 dev veth4 via ${IPv4_3}
ip -netns ${NS3} route add ${IPv4_2}/32 dev veth4 via ${IPv4_3}
ip -netns ${NS3} -6 route add ${IPv6_3}/128 dev veth4
ip -netns ${NS3} -6 route add ${IPv6_1}/128 dev veth4 via ${IPv6_3}
ip -netns ${NS3} -6 route add ${IPv6_2}/128 dev veth4 via ${IPv6_3}
# bottom route
ip -netns ${NS3} route add ${IPv4_7}/32 dev veth8
ip -netns ${NS3} route add ${IPv4_5}/32 dev veth8 via ${IPv4_7}
ip -netns ${NS3} route add ${IPv4_6}/32 dev veth8 via ${IPv4_7}
ip -netns ${NS3} -6 route add ${IPv6_7}/128 dev veth8
ip -netns ${NS3} -6 route add ${IPv6_5}/128 dev veth8 via ${IPv6_7}
ip -netns ${NS3} -6 route add ${IPv6_6}/128 dev veth8 via ${IPv6_7}
# configure IPv4 GRE device in NS3, and a route to it via the "bottom" route
ip -netns ${NS3} tunnel add gre_dev mode gre remote ${IPv4_1} local ${IPv4_GRE} ttl 255
ip -netns ${NS3} link set gre_dev up
ip -netns ${NS3} addr add ${IPv4_GRE} dev gre_dev
ip -netns ${NS1} route add ${IPv4_GRE}/32 dev veth5 via ${IPv4_6}
ip -netns ${NS2} route add ${IPv4_GRE}/32 dev veth7 via ${IPv4_8}
# configure IPv6 GRE device in NS3, and a route to it via the "bottom" route
ip -netns ${NS3} -6 tunnel add name gre6_dev mode ip6gre remote ${IPv6_1} local ${IPv6_GRE} ttl 255
ip -netns ${NS3} link set gre6_dev up
ip -netns ${NS3} -6 addr add ${IPv6_GRE} nodad dev gre6_dev
ip -netns ${NS1} -6 route add ${IPv6_GRE}/128 dev veth5 via ${IPv6_6}
ip -netns ${NS2} -6 route add ${IPv6_GRE}/128 dev veth7 via ${IPv6_8}
# rp_filter gets confused by what these tests are doing, so disable it
ip netns exec ${NS1} sysctl -wq net.ipv4.conf.all.rp_filter=0
ip netns exec ${NS2} sysctl -wq net.ipv4.conf.all.rp_filter=0
ip netns exec ${NS3} sysctl -wq net.ipv4.conf.all.rp_filter=0
}
cleanup() {
ip netns del ${NS1} 2> /dev/null
ip netns del ${NS2} 2> /dev/null
ip netns del ${NS3} 2> /dev/null
}
trap cleanup EXIT
test_ping() {
local readonly PROTO=$1
local readonly EXPECTED=$2
local RET=0
set +e
if [ "${PROTO}" == "IPv4" ] ; then
ip netns exec ${NS1} ping -c 1 -W 1 -I ${IPv4_SRC} ${IPv4_DST} 2>&1 > /dev/null
RET=$?
elif [ "${PROTO}" == "IPv6" ] ; then
ip netns exec ${NS1} ping6 -c 1 -W 6 -I ${IPv6_SRC} ${IPv6_DST} 2>&1 > /dev/null
RET=$?
else
echo "test_ping: unknown PROTO: ${PROTO}"
exit 1
fi
set -e
if [ "0" != "${RET}" ]; then
RET=1
fi
if [ "${EXPECTED}" != "${RET}" ] ; then
echo "FAIL: test_ping: ${RET}"
exit 1
fi
}
test_egress() {
local readonly ENCAP=$1
echo "starting egress ${ENCAP} encap test"
setup
# need to wait a bit for IPv6 to autoconf, otherwise
# ping6 sometimes fails with "unable to bind to address"
# by default, pings work
test_ping IPv4 0
test_ping IPv6 0
# remove NS2->DST routes, ping fails
ip -netns ${NS2} route del ${IPv4_DST}/32 dev veth3
ip -netns ${NS2} -6 route del ${IPv6_DST}/128 dev veth3
test_ping IPv4 1
test_ping IPv6 1
# install replacement routes (LWT/eBPF), pings succeed
if [ "${ENCAP}" == "IPv4" ] ; then
ip -netns ${NS1} route add ${IPv4_DST} encap bpf xmit obj test_lwt_ip_encap.o sec encap_gre dev veth1
ip -netns ${NS1} -6 route add ${IPv6_DST} encap bpf xmit obj test_lwt_ip_encap.o sec encap_gre dev veth1
elif [ "${ENCAP}" == "IPv6" ] ; then
ip -netns ${NS1} route add ${IPv4_DST} encap bpf xmit obj test_lwt_ip_encap.o sec encap_gre6 dev veth1
ip -netns ${NS1} -6 route add ${IPv6_DST} encap bpf xmit obj test_lwt_ip_encap.o sec encap_gre6 dev veth1
else
echo "FAIL: unknown encap ${ENCAP}"
fi
test_ping IPv4 0
test_ping IPv6 0
cleanup
echo "PASS"
}
test_ingress() {
local readonly ENCAP=$1
echo "starting ingress ${ENCAP} encap test"
setup
# need to wait a bit for IPv6 to autoconf, otherwise
# ping6 sometimes fails with "unable to bind to address"
# by default, pings work
test_ping IPv4 0
test_ping IPv6 0
# remove NS2->DST routes, pings fail
ip -netns ${NS2} route del ${IPv4_DST}/32 dev veth3
ip -netns ${NS2} -6 route del ${IPv6_DST}/128 dev veth3
test_ping IPv4 1
test_ping IPv6 1
# install replacement routes (LWT/eBPF), pings succeed
if [ "${ENCAP}" == "IPv4" ] ; then
ip -netns ${NS2} route add ${IPv4_DST} encap bpf in obj test_lwt_ip_encap.o sec encap_gre dev veth2
ip -netns ${NS2} -6 route add ${IPv6_DST} encap bpf in obj test_lwt_ip_encap.o sec encap_gre dev veth2
elif [ "${ENCAP}" == "IPv6" ] ; then
ip -netns ${NS2} route add ${IPv4_DST} encap bpf in obj test_lwt_ip_encap.o sec encap_gre6 dev veth2
ip -netns ${NS2} -6 route add ${IPv6_DST} encap bpf in obj test_lwt_ip_encap.o sec encap_gre6 dev veth2
else
echo "FAIL: unknown encap ${ENCAP}"
fi
test_ping IPv4 0
test_ping IPv6 0
cleanup
echo "PASS"
}
test_egress IPv4
test_egress IPv6
test_ingress IPv4
test_ingress IPv6
echo "all tests passed"
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7