437 lines
13 KiB
C
437 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/*
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* End-to-end eBPF tunnel test suite
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* The file tests BPF network tunnel implementation.
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*
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* Topology:
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* ---------
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* root namespace | at_ns0 namespace
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* |
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* ----------- | -----------
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* | tnl dev | | | tnl dev | (overlay network)
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* ----------- | -----------
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* metadata-mode | metadata-mode
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* with bpf | with bpf
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* |
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* ---------- | ----------
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* | veth1 | --------- | veth0 | (underlay network)
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* ---------- peer ----------
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*
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*
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* Device Configuration
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* --------------------
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* root namespace with metadata-mode tunnel + BPF
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* Device names and addresses:
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* veth1 IP 1: 172.16.1.200, IPv6: 00::22 (underlay)
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* IP 2: 172.16.1.20, IPv6: 00::bb (underlay)
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* tunnel dev <type>11, ex: gre11, IPv4: 10.1.1.200, IPv6: 1::22 (overlay)
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*
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* Namespace at_ns0 with native tunnel
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* Device names and addresses:
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* veth0 IPv4: 172.16.1.100, IPv6: 00::11 (underlay)
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* tunnel dev <type>00, ex: gre00, IPv4: 10.1.1.100, IPv6: 1::11 (overlay)
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*
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*
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* End-to-end ping packet flow
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* ---------------------------
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* Most of the tests start by namespace creation, device configuration,
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* then ping the underlay and overlay network. When doing 'ping 10.1.1.100'
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* from root namespace, the following operations happen:
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* 1) Route lookup shows 10.1.1.100/24 belongs to tnl dev, fwd to tnl dev.
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* 2) Tnl device's egress BPF program is triggered and set the tunnel metadata,
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* with local_ip=172.16.1.200, remote_ip=172.16.1.100. BPF program choose
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* the primary or secondary ip of veth1 as the local ip of tunnel. The
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* choice is made based on the value of bpf map local_ip_map.
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* 3) Outer tunnel header is prepended and route the packet to veth1's egress.
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* 4) veth0's ingress queue receive the tunneled packet at namespace at_ns0.
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* 5) Tunnel protocol handler, ex: vxlan_rcv, decap the packet.
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* 6) Forward the packet to the overlay tnl dev.
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*/
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#include <arpa/inet.h>
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#include <linux/if_tun.h>
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#include <linux/limits.h>
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#include <linux/sysctl.h>
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#include <linux/time_types.h>
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#include <linux/net_tstamp.h>
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#include <net/if.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "test_progs.h"
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#include "network_helpers.h"
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#include "test_tunnel_kern.skel.h"
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#define IP4_ADDR_VETH0 "172.16.1.100"
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#define IP4_ADDR1_VETH1 "172.16.1.200"
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#define IP4_ADDR2_VETH1 "172.16.1.20"
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#define IP4_ADDR_TUNL_DEV0 "10.1.1.100"
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#define IP4_ADDR_TUNL_DEV1 "10.1.1.200"
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#define IP6_ADDR_VETH0 "::11"
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#define IP6_ADDR1_VETH1 "::22"
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#define IP6_ADDR2_VETH1 "::bb"
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#define IP4_ADDR1_HEX_VETH1 0xac1001c8
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#define IP4_ADDR2_HEX_VETH1 0xac100114
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#define IP6_ADDR1_HEX_VETH1 0x22
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#define IP6_ADDR2_HEX_VETH1 0xbb
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#define MAC_TUNL_DEV0 "52:54:00:d9:01:00"
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#define MAC_TUNL_DEV1 "52:54:00:d9:02:00"
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#define MAC_VETH1 "52:54:00:d9:03:00"
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#define VXLAN_TUNL_DEV0 "vxlan00"
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#define VXLAN_TUNL_DEV1 "vxlan11"
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#define IP6VXLAN_TUNL_DEV0 "ip6vxlan00"
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#define IP6VXLAN_TUNL_DEV1 "ip6vxlan11"
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#define PING_ARGS "-i 0.01 -c 3 -w 10 -q"
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#define SYS(fmt, ...) \
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({ \
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char cmd[1024]; \
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snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__); \
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if (!ASSERT_OK(system(cmd), cmd)) \
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goto fail; \
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})
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#define SYS_NOFAIL(fmt, ...) \
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({ \
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char cmd[1024]; \
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snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__); \
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system(cmd); \
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})
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static int config_device(void)
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{
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SYS("ip netns add at_ns0");
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SYS("ip link add veth0 address " MAC_VETH1 " type veth peer name veth1");
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SYS("ip link set veth0 netns at_ns0");
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SYS("ip addr add " IP4_ADDR1_VETH1 "/24 dev veth1");
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SYS("ip link set dev veth1 up mtu 1500");
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SYS("ip netns exec at_ns0 ip addr add " IP4_ADDR_VETH0 "/24 dev veth0");
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SYS("ip netns exec at_ns0 ip link set dev veth0 up mtu 1500");
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return 0;
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fail:
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return -1;
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}
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static void cleanup(void)
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{
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SYS_NOFAIL("test -f /var/run/netns/at_ns0 && ip netns delete at_ns0");
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SYS_NOFAIL("ip link del veth1 2> /dev/null");
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SYS_NOFAIL("ip link del %s 2> /dev/null", VXLAN_TUNL_DEV1);
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SYS_NOFAIL("ip link del %s 2> /dev/null", IP6VXLAN_TUNL_DEV1);
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}
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static int add_vxlan_tunnel(void)
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{
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/* at_ns0 namespace */
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SYS("ip netns exec at_ns0 ip link add dev %s type vxlan external gbp dstport 4789",
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VXLAN_TUNL_DEV0);
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SYS("ip netns exec at_ns0 ip link set dev %s address %s up",
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VXLAN_TUNL_DEV0, MAC_TUNL_DEV0);
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SYS("ip netns exec at_ns0 ip addr add dev %s %s/24",
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VXLAN_TUNL_DEV0, IP4_ADDR_TUNL_DEV0);
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SYS("ip netns exec at_ns0 ip neigh add %s lladdr %s dev %s",
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IP4_ADDR_TUNL_DEV1, MAC_TUNL_DEV1, VXLAN_TUNL_DEV0);
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SYS("ip netns exec at_ns0 ip neigh add %s lladdr %s dev veth0",
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IP4_ADDR2_VETH1, MAC_VETH1);
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/* root namespace */
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SYS("ip link add dev %s type vxlan external gbp dstport 4789",
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VXLAN_TUNL_DEV1);
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SYS("ip link set dev %s address %s up", VXLAN_TUNL_DEV1, MAC_TUNL_DEV1);
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SYS("ip addr add dev %s %s/24", VXLAN_TUNL_DEV1, IP4_ADDR_TUNL_DEV1);
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SYS("ip neigh add %s lladdr %s dev %s",
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IP4_ADDR_TUNL_DEV0, MAC_TUNL_DEV0, VXLAN_TUNL_DEV1);
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return 0;
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fail:
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return -1;
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}
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static void delete_vxlan_tunnel(void)
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{
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SYS_NOFAIL("ip netns exec at_ns0 ip link delete dev %s",
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VXLAN_TUNL_DEV0);
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SYS_NOFAIL("ip link delete dev %s", VXLAN_TUNL_DEV1);
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}
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static int add_ip6vxlan_tunnel(void)
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{
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SYS("ip netns exec at_ns0 ip -6 addr add %s/96 dev veth0",
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IP6_ADDR_VETH0);
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SYS("ip netns exec at_ns0 ip link set dev veth0 up");
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SYS("ip -6 addr add %s/96 dev veth1", IP6_ADDR1_VETH1);
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SYS("ip -6 addr add %s/96 dev veth1", IP6_ADDR2_VETH1);
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SYS("ip link set dev veth1 up");
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/* at_ns0 namespace */
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SYS("ip netns exec at_ns0 ip link add dev %s type vxlan external dstport 4789",
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IP6VXLAN_TUNL_DEV0);
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SYS("ip netns exec at_ns0 ip addr add dev %s %s/24",
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IP6VXLAN_TUNL_DEV0, IP4_ADDR_TUNL_DEV0);
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SYS("ip netns exec at_ns0 ip link set dev %s address %s up",
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IP6VXLAN_TUNL_DEV0, MAC_TUNL_DEV0);
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/* root namespace */
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SYS("ip link add dev %s type vxlan external dstport 4789",
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IP6VXLAN_TUNL_DEV1);
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SYS("ip addr add dev %s %s/24", IP6VXLAN_TUNL_DEV1, IP4_ADDR_TUNL_DEV1);
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SYS("ip link set dev %s address %s up",
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IP6VXLAN_TUNL_DEV1, MAC_TUNL_DEV1);
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return 0;
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fail:
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return -1;
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}
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static void delete_ip6vxlan_tunnel(void)
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{
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SYS_NOFAIL("ip netns exec at_ns0 ip -6 addr delete %s/96 dev veth0",
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IP6_ADDR_VETH0);
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SYS_NOFAIL("ip -6 addr delete %s/96 dev veth1", IP6_ADDR1_VETH1);
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SYS_NOFAIL("ip -6 addr delete %s/96 dev veth1", IP6_ADDR2_VETH1);
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SYS_NOFAIL("ip netns exec at_ns0 ip link delete dev %s",
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IP6VXLAN_TUNL_DEV0);
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SYS_NOFAIL("ip link delete dev %s", IP6VXLAN_TUNL_DEV1);
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}
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static int test_ping(int family, const char *addr)
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{
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SYS("%s %s %s > /dev/null", ping_command(family), PING_ARGS, addr);
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return 0;
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fail:
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return -1;
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}
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static int attach_tc_prog(struct bpf_tc_hook *hook, int igr_fd, int egr_fd)
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{
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DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts1, .handle = 1,
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.priority = 1, .prog_fd = igr_fd);
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DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts2, .handle = 1,
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.priority = 1, .prog_fd = egr_fd);
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int ret;
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ret = bpf_tc_hook_create(hook);
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if (!ASSERT_OK(ret, "create tc hook"))
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return ret;
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if (igr_fd >= 0) {
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hook->attach_point = BPF_TC_INGRESS;
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ret = bpf_tc_attach(hook, &opts1);
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if (!ASSERT_OK(ret, "bpf_tc_attach")) {
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bpf_tc_hook_destroy(hook);
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return ret;
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}
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}
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if (egr_fd >= 0) {
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hook->attach_point = BPF_TC_EGRESS;
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ret = bpf_tc_attach(hook, &opts2);
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if (!ASSERT_OK(ret, "bpf_tc_attach")) {
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bpf_tc_hook_destroy(hook);
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return ret;
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}
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}
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return 0;
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}
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static void test_vxlan_tunnel(void)
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{
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struct test_tunnel_kern *skel = NULL;
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struct nstoken *nstoken;
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int local_ip_map_fd = -1;
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int set_src_prog_fd, get_src_prog_fd;
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int set_dst_prog_fd;
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int key = 0, ifindex = -1;
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uint local_ip;
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int err;
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DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook,
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.attach_point = BPF_TC_INGRESS);
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/* add vxlan tunnel */
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err = add_vxlan_tunnel();
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if (!ASSERT_OK(err, "add vxlan tunnel"))
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goto done;
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/* load and attach bpf prog to tunnel dev tc hook point */
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skel = test_tunnel_kern__open_and_load();
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if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
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goto done;
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ifindex = if_nametoindex(VXLAN_TUNL_DEV1);
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if (!ASSERT_NEQ(ifindex, 0, "vxlan11 ifindex"))
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goto done;
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tc_hook.ifindex = ifindex;
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get_src_prog_fd = bpf_program__fd(skel->progs.vxlan_get_tunnel_src);
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set_src_prog_fd = bpf_program__fd(skel->progs.vxlan_set_tunnel_src);
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if (!ASSERT_GE(get_src_prog_fd, 0, "bpf_program__fd"))
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goto done;
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if (!ASSERT_GE(set_src_prog_fd, 0, "bpf_program__fd"))
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goto done;
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if (attach_tc_prog(&tc_hook, get_src_prog_fd, set_src_prog_fd))
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goto done;
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/* load and attach bpf prog to veth dev tc hook point */
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ifindex = if_nametoindex("veth1");
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if (!ASSERT_NEQ(ifindex, 0, "veth1 ifindex"))
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goto done;
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tc_hook.ifindex = ifindex;
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set_dst_prog_fd = bpf_program__fd(skel->progs.veth_set_outer_dst);
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if (!ASSERT_GE(set_dst_prog_fd, 0, "bpf_program__fd"))
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goto done;
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if (attach_tc_prog(&tc_hook, set_dst_prog_fd, -1))
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goto done;
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/* load and attach prog set_md to tunnel dev tc hook point at_ns0 */
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nstoken = open_netns("at_ns0");
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if (!ASSERT_OK_PTR(nstoken, "setns src"))
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goto done;
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ifindex = if_nametoindex(VXLAN_TUNL_DEV0);
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if (!ASSERT_NEQ(ifindex, 0, "vxlan00 ifindex"))
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goto done;
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tc_hook.ifindex = ifindex;
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set_dst_prog_fd = bpf_program__fd(skel->progs.vxlan_set_tunnel_dst);
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if (!ASSERT_GE(set_dst_prog_fd, 0, "bpf_program__fd"))
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goto done;
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if (attach_tc_prog(&tc_hook, -1, set_dst_prog_fd))
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goto done;
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close_netns(nstoken);
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/* use veth1 ip 2 as tunnel source ip */
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local_ip_map_fd = bpf_map__fd(skel->maps.local_ip_map);
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if (!ASSERT_GE(local_ip_map_fd, 0, "bpf_map__fd"))
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goto done;
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local_ip = IP4_ADDR2_HEX_VETH1;
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err = bpf_map_update_elem(local_ip_map_fd, &key, &local_ip, BPF_ANY);
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if (!ASSERT_OK(err, "update bpf local_ip_map"))
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goto done;
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/* ping test */
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err = test_ping(AF_INET, IP4_ADDR_TUNL_DEV0);
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if (!ASSERT_OK(err, "test_ping"))
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goto done;
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|
|
||
|
|
done:
|
||
|
|
/* delete vxlan tunnel */
|
||
|
|
delete_vxlan_tunnel();
|
||
|
|
if (local_ip_map_fd >= 0)
|
||
|
|
close(local_ip_map_fd);
|
||
|
|
if (skel)
|
||
|
|
test_tunnel_kern__destroy(skel);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void test_ip6vxlan_tunnel(void)
|
||
|
|
{
|
||
|
|
struct test_tunnel_kern *skel = NULL;
|
||
|
|
struct nstoken *nstoken;
|
||
|
|
int local_ip_map_fd = -1;
|
||
|
|
int set_src_prog_fd, get_src_prog_fd;
|
||
|
|
int set_dst_prog_fd;
|
||
|
|
int key = 0, ifindex = -1;
|
||
|
|
uint local_ip;
|
||
|
|
int err;
|
||
|
|
DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook,
|
||
|
|
.attach_point = BPF_TC_INGRESS);
|
||
|
|
|
||
|
|
/* add vxlan tunnel */
|
||
|
|
err = add_ip6vxlan_tunnel();
|
||
|
|
if (!ASSERT_OK(err, "add_ip6vxlan_tunnel"))
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
/* load and attach bpf prog to tunnel dev tc hook point */
|
||
|
|
skel = test_tunnel_kern__open_and_load();
|
||
|
|
if (!ASSERT_OK_PTR(skel, "test_tunnel_kern__open_and_load"))
|
||
|
|
goto done;
|
||
|
|
ifindex = if_nametoindex(IP6VXLAN_TUNL_DEV1);
|
||
|
|
if (!ASSERT_NEQ(ifindex, 0, "ip6vxlan11 ifindex"))
|
||
|
|
goto done;
|
||
|
|
tc_hook.ifindex = ifindex;
|
||
|
|
get_src_prog_fd = bpf_program__fd(skel->progs.ip6vxlan_get_tunnel_src);
|
||
|
|
set_src_prog_fd = bpf_program__fd(skel->progs.ip6vxlan_set_tunnel_src);
|
||
|
|
if (!ASSERT_GE(set_src_prog_fd, 0, "bpf_program__fd"))
|
||
|
|
goto done;
|
||
|
|
if (!ASSERT_GE(get_src_prog_fd, 0, "bpf_program__fd"))
|
||
|
|
goto done;
|
||
|
|
if (attach_tc_prog(&tc_hook, get_src_prog_fd, set_src_prog_fd))
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
/* load and attach prog set_md to tunnel dev tc hook point at_ns0 */
|
||
|
|
nstoken = open_netns("at_ns0");
|
||
|
|
if (!ASSERT_OK_PTR(nstoken, "setns src"))
|
||
|
|
goto done;
|
||
|
|
ifindex = if_nametoindex(IP6VXLAN_TUNL_DEV0);
|
||
|
|
if (!ASSERT_NEQ(ifindex, 0, "ip6vxlan00 ifindex"))
|
||
|
|
goto done;
|
||
|
|
tc_hook.ifindex = ifindex;
|
||
|
|
set_dst_prog_fd = bpf_program__fd(skel->progs.ip6vxlan_set_tunnel_dst);
|
||
|
|
if (!ASSERT_GE(set_dst_prog_fd, 0, "bpf_program__fd"))
|
||
|
|
goto done;
|
||
|
|
if (attach_tc_prog(&tc_hook, -1, set_dst_prog_fd))
|
||
|
|
goto done;
|
||
|
|
close_netns(nstoken);
|
||
|
|
|
||
|
|
/* use veth1 ip 2 as tunnel source ip */
|
||
|
|
local_ip_map_fd = bpf_map__fd(skel->maps.local_ip_map);
|
||
|
|
if (!ASSERT_GE(local_ip_map_fd, 0, "get local_ip_map fd"))
|
||
|
|
goto done;
|
||
|
|
local_ip = IP6_ADDR2_HEX_VETH1;
|
||
|
|
err = bpf_map_update_elem(local_ip_map_fd, &key, &local_ip, BPF_ANY);
|
||
|
|
if (!ASSERT_OK(err, "update bpf local_ip_map"))
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
/* ping test */
|
||
|
|
err = test_ping(AF_INET, IP4_ADDR_TUNL_DEV0);
|
||
|
|
if (!ASSERT_OK(err, "test_ping"))
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
done:
|
||
|
|
/* delete ipv6 vxlan tunnel */
|
||
|
|
delete_ip6vxlan_tunnel();
|
||
|
|
if (local_ip_map_fd >= 0)
|
||
|
|
close(local_ip_map_fd);
|
||
|
|
if (skel)
|
||
|
|
test_tunnel_kern__destroy(skel);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define RUN_TEST(name) \
|
||
|
|
({ \
|
||
|
|
if (test__start_subtest(#name)) { \
|
||
|
|
test_ ## name(); \
|
||
|
|
} \
|
||
|
|
})
|
||
|
|
|
||
|
|
static void *test_tunnel_run_tests(void *arg)
|
||
|
|
{
|
||
|
|
cleanup();
|
||
|
|
config_device();
|
||
|
|
|
||
|
|
RUN_TEST(vxlan_tunnel);
|
||
|
|
RUN_TEST(ip6vxlan_tunnel);
|
||
|
|
|
||
|
|
cleanup();
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
void serial_test_tunnel(void)
|
||
|
|
{
|
||
|
|
pthread_t test_thread;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
/* Run the tests in their own thread to isolate the namespace changes
|
||
|
|
* so they do not affect the environment of other tests.
|
||
|
|
* (specifically needed because of unshare(CLONE_NEWNS) in open_netns())
|
||
|
|
*/
|
||
|
|
err = pthread_create(&test_thread, NULL, &test_tunnel_run_tests, NULL);
|
||
|
|
if (ASSERT_OK(err, "pthread_create"))
|
||
|
|
ASSERT_OK(pthread_join(test_thread, NULL), "pthread_join");
|
||
|
|
}
|