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: Peter Oskolkov <posk@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Peter Oskolkov
Alexei Starovoitov
Родитель
755db4771c
Коммит
0fde56e438
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@ -50,7 +50,8 @@ TEST_PROGS := test_kmod.sh \
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test_lirc_mode2.sh \
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test_skb_cgroup_id.sh \
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test_flow_dissector.sh \
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test_xdp_vlan.sh
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test_xdp_vlan.sh \
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test_lwt_ip_encap.sh
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TEST_PROGS_EXTENDED := with_addr.sh \
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with_tunnels.sh \
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@ -0,0 +1,85 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <stddef.h>
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#include <string.h>
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#include <linux/bpf.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include "bpf_helpers.h"
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#include "bpf_endian.h"
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struct grehdr {
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__be16 flags;
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__be16 protocol;
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};
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SEC("encap_gre")
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int bpf_lwt_encap_gre(struct __sk_buff *skb)
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{
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struct encap_hdr {
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struct iphdr iph;
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struct grehdr greh;
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} hdr;
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int err;
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memset(&hdr, 0, sizeof(struct encap_hdr));
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hdr.iph.ihl = 5;
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hdr.iph.version = 4;
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hdr.iph.ttl = 0x40;
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hdr.iph.protocol = 47; /* IPPROTO_GRE */
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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hdr.iph.saddr = 0x640110ac; /* 172.16.1.100 */
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hdr.iph.daddr = 0x641010ac; /* 172.16.16.100 */
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#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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hdr.iph.saddr = 0xac100164; /* 172.16.1.100 */
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hdr.iph.daddr = 0xac101064; /* 172.16.16.100 */
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#else
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#error "Fix your compiler's __BYTE_ORDER__?!"
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#endif
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hdr.iph.tot_len = bpf_htons(skb->len + sizeof(struct encap_hdr));
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hdr.greh.protocol = skb->protocol;
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err = bpf_lwt_push_encap(skb, BPF_LWT_ENCAP_IP, &hdr,
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sizeof(struct encap_hdr));
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if (err)
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return BPF_DROP;
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return BPF_LWT_REROUTE;
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}
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SEC("encap_gre6")
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int bpf_lwt_encap_gre6(struct __sk_buff *skb)
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{
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struct encap_hdr {
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struct ipv6hdr ip6hdr;
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struct grehdr greh;
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} hdr;
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int err;
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memset(&hdr, 0, sizeof(struct encap_hdr));
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hdr.ip6hdr.version = 6;
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hdr.ip6hdr.payload_len = bpf_htons(skb->len + sizeof(struct grehdr));
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hdr.ip6hdr.nexthdr = 47; /* IPPROTO_GRE */
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hdr.ip6hdr.hop_limit = 0x40;
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/* fb01::1 */
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hdr.ip6hdr.saddr.s6_addr[0] = 0xfb;
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hdr.ip6hdr.saddr.s6_addr[1] = 1;
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hdr.ip6hdr.saddr.s6_addr[15] = 1;
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/* fb10::1 */
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hdr.ip6hdr.daddr.s6_addr[0] = 0xfb;
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hdr.ip6hdr.daddr.s6_addr[1] = 0x10;
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hdr.ip6hdr.daddr.s6_addr[15] = 1;
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hdr.greh.protocol = skb->protocol;
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err = bpf_lwt_push_encap(skb, BPF_LWT_ENCAP_IP, &hdr,
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sizeof(struct encap_hdr));
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if (err)
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return BPF_DROP;
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return BPF_LWT_REROUTE;
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}
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char _license[] SEC("license") = "GPL";
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@ -0,0 +1,311 @@
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#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Setup/topology:
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#
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# NS1 NS2 NS3
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# veth1 <---> veth2 veth3 <---> veth4 (the top route)
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# veth5 <---> veth6 veth7 <---> veth8 (the bottom route)
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#
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# each vethN gets IPv[4|6]_N address
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#
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# IPv*_SRC = IPv*_1
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# IPv*_DST = IPv*_4
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#
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# all tests test pings from IPv*_SRC to IPv*_DST
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#
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# by default, routes are configured to allow packets to go
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# IP*_1 <=> IP*_2 <=> IP*_3 <=> IP*_4 (the top route)
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#
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# a GRE device is installed in NS3 with IPv*_GRE, and
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# NS1/NS2 are configured to route packets to IPv*_GRE via IP*_8
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# (the bottom route)
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#
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# Tests:
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#
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# 1. routes NS2->IPv*_DST are brought down, so the only way a ping
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# from IP*_SRC to IP*_DST can work is via IPv*_GRE
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#
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# 2a. in an egress test, a bpf LWT_XMIT program is installed on veth1
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# that encaps the packets with an IP/GRE header to route to IPv*_GRE
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#
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# ping: SRC->[encap at veth1:egress]->GRE:decap->DST
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# ping replies go DST->SRC directly
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#
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# 2b. in an ingress test, a bpf LWT_IN program is installed on veth2
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# that encaps the packets with an IP/GRE header to route to IPv*_GRE
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#
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# ping: SRC->[encap at veth2:ingress]->GRE:decap->DST
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# ping replies go DST->SRC directly
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set -e # exit on error
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if [[ $EUID -ne 0 ]]; then
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echo "This script must be run as root"
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echo "FAIL"
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exit 1
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fi
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readonly NS1="ns1-$(mktemp -u XXXXXX)"
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readonly NS2="ns2-$(mktemp -u XXXXXX)"
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readonly NS3="ns3-$(mktemp -u XXXXXX)"
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readonly IPv4_1="172.16.1.100"
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readonly IPv4_2="172.16.2.100"
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readonly IPv4_3="172.16.3.100"
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readonly IPv4_4="172.16.4.100"
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readonly IPv4_5="172.16.5.100"
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readonly IPv4_6="172.16.6.100"
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readonly IPv4_7="172.16.7.100"
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readonly IPv4_8="172.16.8.100"
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readonly IPv4_GRE="172.16.16.100"
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readonly IPv4_SRC=$IPv4_1
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readonly IPv4_DST=$IPv4_4
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readonly IPv6_1="fb01::1"
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readonly IPv6_2="fb02::1"
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readonly IPv6_3="fb03::1"
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readonly IPv6_4="fb04::1"
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readonly IPv6_5="fb05::1"
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readonly IPv6_6="fb06::1"
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readonly IPv6_7="fb07::1"
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readonly IPv6_8="fb08::1"
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readonly IPv6_GRE="fb10::1"
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readonly IPv6_SRC=$IPv6_1
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readonly IPv6_DST=$IPv6_4
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setup() {
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set -e # exit on error
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# create devices and namespaces
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ip netns add "${NS1}"
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ip netns add "${NS2}"
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ip netns add "${NS3}"
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ip link add veth1 type veth peer name veth2
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ip link add veth3 type veth peer name veth4
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ip link add veth5 type veth peer name veth6
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ip link add veth7 type veth peer name veth8
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ip netns exec ${NS2} sysctl -wq net.ipv4.ip_forward=1
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ip netns exec ${NS2} sysctl -wq net.ipv6.conf.all.forwarding=1
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ip link set veth1 netns ${NS1}
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ip link set veth2 netns ${NS2}
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ip link set veth3 netns ${NS2}
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ip link set veth4 netns ${NS3}
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ip link set veth5 netns ${NS1}
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ip link set veth6 netns ${NS2}
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ip link set veth7 netns ${NS2}
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ip link set veth8 netns ${NS3}
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# configure addesses: the top route (1-2-3-4)
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ip -netns ${NS1} addr add ${IPv4_1}/24 dev veth1
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ip -netns ${NS2} addr add ${IPv4_2}/24 dev veth2
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ip -netns ${NS2} addr add ${IPv4_3}/24 dev veth3
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ip -netns ${NS3} addr add ${IPv4_4}/24 dev veth4
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ip -netns ${NS1} -6 addr add ${IPv6_1}/128 nodad dev veth1
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ip -netns ${NS2} -6 addr add ${IPv6_2}/128 nodad dev veth2
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ip -netns ${NS2} -6 addr add ${IPv6_3}/128 nodad dev veth3
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ip -netns ${NS3} -6 addr add ${IPv6_4}/128 nodad dev veth4
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# configure addresses: the bottom route (5-6-7-8)
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ip -netns ${NS1} addr add ${IPv4_5}/24 dev veth5
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ip -netns ${NS2} addr add ${IPv4_6}/24 dev veth6
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ip -netns ${NS2} addr add ${IPv4_7}/24 dev veth7
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ip -netns ${NS3} addr add ${IPv4_8}/24 dev veth8
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ip -netns ${NS1} -6 addr add ${IPv6_5}/128 nodad dev veth5
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ip -netns ${NS2} -6 addr add ${IPv6_6}/128 nodad dev veth6
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ip -netns ${NS2} -6 addr add ${IPv6_7}/128 nodad dev veth7
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ip -netns ${NS3} -6 addr add ${IPv6_8}/128 nodad dev veth8
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ip -netns ${NS1} link set dev veth1 up
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ip -netns ${NS2} link set dev veth2 up
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ip -netns ${NS2} link set dev veth3 up
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ip -netns ${NS3} link set dev veth4 up
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ip -netns ${NS1} link set dev veth5 up
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ip -netns ${NS2} link set dev veth6 up
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ip -netns ${NS2} link set dev veth7 up
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ip -netns ${NS3} link set dev veth8 up
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# configure routes: IP*_SRC -> veth1/IP*_2 (= top route) default;
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# the bottom route to specific bottom addresses
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# NS1
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# top route
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ip -netns ${NS1} route add ${IPv4_2}/32 dev veth1
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ip -netns ${NS1} route add default dev veth1 via ${IPv4_2} # go top by default
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ip -netns ${NS1} -6 route add ${IPv6_2}/128 dev veth1
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ip -netns ${NS1} -6 route add default dev veth1 via ${IPv6_2} # go top by default
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# bottom route
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ip -netns ${NS1} route add ${IPv4_6}/32 dev veth5
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ip -netns ${NS1} route add ${IPv4_7}/32 dev veth5 via ${IPv4_6}
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ip -netns ${NS1} route add ${IPv4_8}/32 dev veth5 via ${IPv4_6}
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ip -netns ${NS1} -6 route add ${IPv6_6}/128 dev veth5
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ip -netns ${NS1} -6 route add ${IPv6_7}/128 dev veth5 via ${IPv6_6}
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ip -netns ${NS1} -6 route add ${IPv6_8}/128 dev veth5 via ${IPv6_6}
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# NS2
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# top route
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ip -netns ${NS2} route add ${IPv4_1}/32 dev veth2
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ip -netns ${NS2} route add ${IPv4_4}/32 dev veth3
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ip -netns ${NS2} -6 route add ${IPv6_1}/128 dev veth2
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ip -netns ${NS2} -6 route add ${IPv6_4}/128 dev veth3
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# bottom route
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ip -netns ${NS2} route add ${IPv4_5}/32 dev veth6
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ip -netns ${NS2} route add ${IPv4_8}/32 dev veth7
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ip -netns ${NS2} -6 route add ${IPv6_5}/128 dev veth6
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ip -netns ${NS2} -6 route add ${IPv6_8}/128 dev veth7
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# NS3
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# top route
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ip -netns ${NS3} route add ${IPv4_3}/32 dev veth4
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ip -netns ${NS3} route add ${IPv4_1}/32 dev veth4 via ${IPv4_3}
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ip -netns ${NS3} route add ${IPv4_2}/32 dev veth4 via ${IPv4_3}
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ip -netns ${NS3} -6 route add ${IPv6_3}/128 dev veth4
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ip -netns ${NS3} -6 route add ${IPv6_1}/128 dev veth4 via ${IPv6_3}
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ip -netns ${NS3} -6 route add ${IPv6_2}/128 dev veth4 via ${IPv6_3}
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# bottom route
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ip -netns ${NS3} route add ${IPv4_7}/32 dev veth8
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ip -netns ${NS3} route add ${IPv4_5}/32 dev veth8 via ${IPv4_7}
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ip -netns ${NS3} route add ${IPv4_6}/32 dev veth8 via ${IPv4_7}
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ip -netns ${NS3} -6 route add ${IPv6_7}/128 dev veth8
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ip -netns ${NS3} -6 route add ${IPv6_5}/128 dev veth8 via ${IPv6_7}
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ip -netns ${NS3} -6 route add ${IPv6_6}/128 dev veth8 via ${IPv6_7}
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# configure IPv4 GRE device in NS3, and a route to it via the "bottom" route
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ip -netns ${NS3} tunnel add gre_dev mode gre remote ${IPv4_1} local ${IPv4_GRE} ttl 255
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ip -netns ${NS3} link set gre_dev up
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ip -netns ${NS3} addr add ${IPv4_GRE} dev gre_dev
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ip -netns ${NS1} route add ${IPv4_GRE}/32 dev veth5 via ${IPv4_6}
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ip -netns ${NS2} route add ${IPv4_GRE}/32 dev veth7 via ${IPv4_8}
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# configure IPv6 GRE device in NS3, and a route to it via the "bottom" route
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ip -netns ${NS3} -6 tunnel add name gre6_dev mode ip6gre remote ${IPv6_1} local ${IPv6_GRE} ttl 255
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ip -netns ${NS3} link set gre6_dev up
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ip -netns ${NS3} -6 addr add ${IPv6_GRE} nodad dev gre6_dev
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ip -netns ${NS1} -6 route add ${IPv6_GRE}/128 dev veth5 via ${IPv6_6}
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ip -netns ${NS2} -6 route add ${IPv6_GRE}/128 dev veth7 via ${IPv6_8}
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# rp_filter gets confused by what these tests are doing, so disable it
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ip netns exec ${NS1} sysctl -wq net.ipv4.conf.all.rp_filter=0
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ip netns exec ${NS2} sysctl -wq net.ipv4.conf.all.rp_filter=0
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ip netns exec ${NS3} sysctl -wq net.ipv4.conf.all.rp_filter=0
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}
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cleanup() {
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ip netns del ${NS1} 2> /dev/null
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ip netns del ${NS2} 2> /dev/null
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ip netns del ${NS3} 2> /dev/null
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}
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trap cleanup EXIT
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test_ping() {
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local readonly PROTO=$1
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local readonly EXPECTED=$2
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local RET=0
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set +e
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if [ "${PROTO}" == "IPv4" ] ; then
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ip netns exec ${NS1} ping -c 1 -W 1 -I ${IPv4_SRC} ${IPv4_DST} 2>&1 > /dev/null
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RET=$?
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elif [ "${PROTO}" == "IPv6" ] ; then
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ip netns exec ${NS1} ping6 -c 1 -W 6 -I ${IPv6_SRC} ${IPv6_DST} 2>&1 > /dev/null
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RET=$?
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else
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echo "test_ping: unknown PROTO: ${PROTO}"
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exit 1
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fi
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set -e
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if [ "0" != "${RET}" ]; then
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RET=1
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fi
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if [ "${EXPECTED}" != "${RET}" ] ; then
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echo "FAIL: test_ping: ${RET}"
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exit 1
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fi
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}
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test_egress() {
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local readonly ENCAP=$1
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echo "starting egress ${ENCAP} encap test"
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setup
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# need to wait a bit for IPv6 to autoconf, otherwise
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# ping6 sometimes fails with "unable to bind to address"
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# by default, pings work
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test_ping IPv4 0
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test_ping IPv6 0
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# remove NS2->DST routes, ping fails
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ip -netns ${NS2} route del ${IPv4_DST}/32 dev veth3
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ip -netns ${NS2} -6 route del ${IPv6_DST}/128 dev veth3
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test_ping IPv4 1
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test_ping IPv6 1
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# install replacement routes (LWT/eBPF), pings succeed
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if [ "${ENCAP}" == "IPv4" ] ; then
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ip -netns ${NS1} route add ${IPv4_DST} encap bpf xmit obj test_lwt_ip_encap.o sec encap_gre dev veth1
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ip -netns ${NS1} -6 route add ${IPv6_DST} encap bpf xmit obj test_lwt_ip_encap.o sec encap_gre dev veth1
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elif [ "${ENCAP}" == "IPv6" ] ; then
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ip -netns ${NS1} route add ${IPv4_DST} encap bpf xmit obj test_lwt_ip_encap.o sec encap_gre6 dev veth1
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ip -netns ${NS1} -6 route add ${IPv6_DST} encap bpf xmit obj test_lwt_ip_encap.o sec encap_gre6 dev veth1
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else
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echo "FAIL: unknown encap ${ENCAP}"
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fi
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test_ping IPv4 0
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test_ping IPv6 0
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cleanup
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echo "PASS"
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}
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test_ingress() {
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local readonly ENCAP=$1
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echo "starting ingress ${ENCAP} encap test"
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setup
|
||||
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||||
# need to wait a bit for IPv6 to autoconf, otherwise
|
||||
# ping6 sometimes fails with "unable to bind to address"
|
||||
|
||||
# by default, pings work
|
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test_ping IPv4 0
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test_ping IPv6 0
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||||
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# remove NS2->DST routes, pings fail
|
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ip -netns ${NS2} route del ${IPv4_DST}/32 dev veth3
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ip -netns ${NS2} -6 route del ${IPv6_DST}/128 dev veth3
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test_ping IPv4 1
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test_ping IPv6 1
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|
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# install replacement routes (LWT/eBPF), pings succeed
|
||||
if [ "${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"
|
||||
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Ссылка в новой задаче