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selftests/bpf: Add tests for XDP bonding
Add a test suite to test XDP bonding implementation over a pair of veth devices. Signed-off-by: Jussi Maki <joamaki@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210731055738.16820-8-joamaki@gmail.com
This commit is contained in:
Jussi Maki
Daniel Borkmann
parent
95413846cc
commit
6aab1c81b9
520
tools/testing/selftests/bpf/prog_tests/xdp_bonding.c
Normal file
520
tools/testing/selftests/bpf/prog_tests/xdp_bonding.c
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@ -0,0 +1,520 @@
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// SPDX-License-Identifier: GPL-2.0
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/**
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* Test XDP bonding support
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*
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* Sets up two bonded veth pairs between two fresh namespaces
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* and verifies that XDP_TX program loaded on a bond device
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* are correctly loaded onto the slave devices and XDP_TX'd
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* packets are balanced using bonding.
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*/
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#define _GNU_SOURCE
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#include <sched.h>
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#include <net/if.h>
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#include <linux/if_link.h>
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#include "test_progs.h"
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#include "network_helpers.h"
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#include <linux/if_bonding.h>
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#include <linux/limits.h>
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#include <linux/udp.h>
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#include "xdp_dummy.skel.h"
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#include "xdp_redirect_multi_kern.skel.h"
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#include "xdp_tx.skel.h"
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#define BOND1_MAC {0x00, 0x11, 0x22, 0x33, 0x44, 0x55}
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#define BOND1_MAC_STR "00:11:22:33:44:55"
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#define BOND2_MAC {0x00, 0x22, 0x33, 0x44, 0x55, 0x66}
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#define BOND2_MAC_STR "00:22:33:44:55:66"
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#define NPACKETS 100
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static int root_netns_fd = -1;
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static void restore_root_netns(void)
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{
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ASSERT_OK(setns(root_netns_fd, CLONE_NEWNET), "restore_root_netns");
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}
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static int setns_by_name(char *name)
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{
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int nsfd, err;
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char nspath[PATH_MAX];
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snprintf(nspath, sizeof(nspath), "%s/%s", "/var/run/netns", name);
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nsfd = open(nspath, O_RDONLY | O_CLOEXEC);
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if (nsfd < 0)
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return -1;
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err = setns(nsfd, CLONE_NEWNET);
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close(nsfd);
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return err;
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}
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static int get_rx_packets(const char *iface)
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{
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FILE *f;
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char line[512];
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int iface_len = strlen(iface);
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f = fopen("/proc/net/dev", "r");
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if (!f)
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return -1;
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while (fgets(line, sizeof(line), f)) {
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char *p = line;
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while (*p == ' ')
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p++; /* skip whitespace */
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if (!strncmp(p, iface, iface_len)) {
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p += iface_len;
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if (*p++ != ':')
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continue;
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while (*p == ' ')
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p++; /* skip whitespace */
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while (*p && *p != ' ')
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p++; /* skip rx bytes */
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while (*p == ' ')
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p++; /* skip whitespace */
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fclose(f);
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return atoi(p);
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}
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}
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fclose(f);
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return -1;
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}
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#define MAX_BPF_LINKS 8
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struct skeletons {
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struct xdp_dummy *xdp_dummy;
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struct xdp_tx *xdp_tx;
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struct xdp_redirect_multi_kern *xdp_redirect_multi_kern;
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int nlinks;
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struct bpf_link *links[MAX_BPF_LINKS];
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};
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static int xdp_attach(struct skeletons *skeletons, struct bpf_program *prog, char *iface)
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{
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struct bpf_link *link;
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int ifindex;
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ifindex = if_nametoindex(iface);
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if (!ASSERT_GT(ifindex, 0, "get ifindex"))
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return -1;
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if (!ASSERT_LE(skeletons->nlinks+1, MAX_BPF_LINKS, "too many XDP programs attached"))
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return -1;
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link = bpf_program__attach_xdp(prog, ifindex);
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if (!ASSERT_OK_PTR(link, "attach xdp program"))
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return -1;
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skeletons->links[skeletons->nlinks++] = link;
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return 0;
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}
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enum {
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BOND_ONE_NO_ATTACH = 0,
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BOND_BOTH_AND_ATTACH,
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};
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static const char * const mode_names[] = {
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[BOND_MODE_ROUNDROBIN] = "balance-rr",
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[BOND_MODE_ACTIVEBACKUP] = "active-backup",
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[BOND_MODE_XOR] = "balance-xor",
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[BOND_MODE_BROADCAST] = "broadcast",
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[BOND_MODE_8023AD] = "802.3ad",
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[BOND_MODE_TLB] = "balance-tlb",
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[BOND_MODE_ALB] = "balance-alb",
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};
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static const char * const xmit_policy_names[] = {
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[BOND_XMIT_POLICY_LAYER2] = "layer2",
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[BOND_XMIT_POLICY_LAYER34] = "layer3+4",
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[BOND_XMIT_POLICY_LAYER23] = "layer2+3",
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[BOND_XMIT_POLICY_ENCAP23] = "encap2+3",
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[BOND_XMIT_POLICY_ENCAP34] = "encap3+4",
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};
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static int bonding_setup(struct skeletons *skeletons, int mode, int xmit_policy,
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int bond_both_attach)
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{
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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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return -1; \
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})
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SYS("ip netns add ns_dst");
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SYS("ip link add veth1_1 type veth peer name veth2_1 netns ns_dst");
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SYS("ip link add veth1_2 type veth peer name veth2_2 netns ns_dst");
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SYS("ip link add bond1 type bond mode %s xmit_hash_policy %s",
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mode_names[mode], xmit_policy_names[xmit_policy]);
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SYS("ip link set bond1 up address " BOND1_MAC_STR " addrgenmode none");
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SYS("ip -netns ns_dst link add bond2 type bond mode %s xmit_hash_policy %s",
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mode_names[mode], xmit_policy_names[xmit_policy]);
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SYS("ip -netns ns_dst link set bond2 up address " BOND2_MAC_STR " addrgenmode none");
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SYS("ip link set veth1_1 master bond1");
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if (bond_both_attach == BOND_BOTH_AND_ATTACH) {
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SYS("ip link set veth1_2 master bond1");
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} else {
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SYS("ip link set veth1_2 up addrgenmode none");
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if (xdp_attach(skeletons, skeletons->xdp_dummy->progs.xdp_dummy_prog, "veth1_2"))
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return -1;
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}
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SYS("ip -netns ns_dst link set veth2_1 master bond2");
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if (bond_both_attach == BOND_BOTH_AND_ATTACH)
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SYS("ip -netns ns_dst link set veth2_2 master bond2");
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else
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SYS("ip -netns ns_dst link set veth2_2 up addrgenmode none");
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/* Load a dummy program on sending side as with veth peer needs to have a
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* XDP program loaded as well.
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*/
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if (xdp_attach(skeletons, skeletons->xdp_dummy->progs.xdp_dummy_prog, "bond1"))
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return -1;
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if (bond_both_attach == BOND_BOTH_AND_ATTACH) {
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if (!ASSERT_OK(setns_by_name("ns_dst"), "set netns to ns_dst"))
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return -1;
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if (xdp_attach(skeletons, skeletons->xdp_tx->progs.xdp_tx, "bond2"))
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return -1;
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restore_root_netns();
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}
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return 0;
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#undef SYS
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}
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static void bonding_cleanup(struct skeletons *skeletons)
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{
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restore_root_netns();
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while (skeletons->nlinks) {
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skeletons->nlinks--;
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bpf_link__destroy(skeletons->links[skeletons->nlinks]);
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}
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ASSERT_OK(system("ip link delete bond1"), "delete bond1");
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ASSERT_OK(system("ip link delete veth1_1"), "delete veth1_1");
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ASSERT_OK(system("ip link delete veth1_2"), "delete veth1_2");
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ASSERT_OK(system("ip netns delete ns_dst"), "delete ns_dst");
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}
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static int send_udp_packets(int vary_dst_ip)
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{
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struct ethhdr eh = {
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.h_source = BOND1_MAC,
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.h_dest = BOND2_MAC,
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.h_proto = htons(ETH_P_IP),
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};
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uint8_t buf[128] = {};
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struct iphdr *iph = (struct iphdr *)(buf + sizeof(eh));
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struct udphdr *uh = (struct udphdr *)(buf + sizeof(eh) + sizeof(*iph));
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int i, s = -1;
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int ifindex;
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s = socket(AF_PACKET, SOCK_RAW, IPPROTO_RAW);
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if (!ASSERT_GE(s, 0, "socket"))
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goto err;
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ifindex = if_nametoindex("bond1");
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if (!ASSERT_GT(ifindex, 0, "get bond1 ifindex"))
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goto err;
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memcpy(buf, &eh, sizeof(eh));
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iph->ihl = 5;
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iph->version = 4;
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iph->tos = 16;
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iph->id = 1;
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iph->ttl = 64;
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iph->protocol = IPPROTO_UDP;
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iph->saddr = 1;
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iph->daddr = 2;
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iph->tot_len = htons(sizeof(buf) - ETH_HLEN);
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iph->check = 0;
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for (i = 1; i <= NPACKETS; i++) {
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int n;
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struct sockaddr_ll saddr_ll = {
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.sll_ifindex = ifindex,
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.sll_halen = ETH_ALEN,
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.sll_addr = BOND2_MAC,
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};
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/* vary the UDP destination port for even distribution with roundrobin/xor modes */
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uh->dest++;
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if (vary_dst_ip)
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iph->daddr++;
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n = sendto(s, buf, sizeof(buf), 0, (struct sockaddr *)&saddr_ll, sizeof(saddr_ll));
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if (!ASSERT_EQ(n, sizeof(buf), "sendto"))
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goto err;
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}
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return 0;
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err:
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if (s >= 0)
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close(s);
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return -1;
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}
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static void test_xdp_bonding_with_mode(struct skeletons *skeletons, int mode, int xmit_policy)
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{
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int bond1_rx;
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if (bonding_setup(skeletons, mode, xmit_policy, BOND_BOTH_AND_ATTACH))
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goto out;
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if (send_udp_packets(xmit_policy != BOND_XMIT_POLICY_LAYER34))
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goto out;
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bond1_rx = get_rx_packets("bond1");
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ASSERT_EQ(bond1_rx, NPACKETS, "expected more received packets");
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switch (mode) {
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case BOND_MODE_ROUNDROBIN:
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case BOND_MODE_XOR: {
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int veth1_rx = get_rx_packets("veth1_1");
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int veth2_rx = get_rx_packets("veth1_2");
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int diff = abs(veth1_rx - veth2_rx);
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ASSERT_GE(veth1_rx + veth2_rx, NPACKETS, "expected more packets");
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switch (xmit_policy) {
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case BOND_XMIT_POLICY_LAYER2:
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ASSERT_GE(diff, NPACKETS,
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"expected packets on only one of the interfaces");
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break;
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case BOND_XMIT_POLICY_LAYER23:
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case BOND_XMIT_POLICY_LAYER34:
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ASSERT_LT(diff, NPACKETS/2,
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"expected even distribution of packets");
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break;
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default:
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PRINT_FAIL("Unimplemented xmit_policy=%d\n", xmit_policy);
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break;
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}
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break;
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}
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case BOND_MODE_ACTIVEBACKUP: {
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int veth1_rx = get_rx_packets("veth1_1");
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int veth2_rx = get_rx_packets("veth1_2");
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int diff = abs(veth1_rx - veth2_rx);
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ASSERT_GE(diff, NPACKETS,
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"expected packets on only one of the interfaces");
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break;
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}
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default:
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PRINT_FAIL("Unimplemented xmit_policy=%d\n", xmit_policy);
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break;
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}
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out:
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bonding_cleanup(skeletons);
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}
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/* Test the broadcast redirection using xdp_redirect_map_multi_prog and adding
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* all the interfaces to it and checking that broadcasting won't send the packet
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* to neither the ingress bond device (bond2) or its slave (veth2_1).
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*/
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static void test_xdp_bonding_redirect_multi(struct skeletons *skeletons)
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{
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static const char * const ifaces[] = {"bond2", "veth2_1", "veth2_2"};
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int veth1_1_rx, veth1_2_rx;
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int err;
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if (bonding_setup(skeletons, BOND_MODE_ROUNDROBIN, BOND_XMIT_POLICY_LAYER23,
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BOND_ONE_NO_ATTACH))
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goto out;
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if (!ASSERT_OK(setns_by_name("ns_dst"), "could not set netns to ns_dst"))
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goto out;
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/* populate the devmap with the relevant interfaces */
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for (int i = 0; i < ARRAY_SIZE(ifaces); i++) {
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int ifindex = if_nametoindex(ifaces[i]);
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int map_fd = bpf_map__fd(skeletons->xdp_redirect_multi_kern->maps.map_all);
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if (!ASSERT_GT(ifindex, 0, "could not get interface index"))
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goto out;
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err = bpf_map_update_elem(map_fd, &ifindex, &ifindex, 0);
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if (!ASSERT_OK(err, "add interface to map_all"))
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goto out;
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}
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if (xdp_attach(skeletons,
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skeletons->xdp_redirect_multi_kern->progs.xdp_redirect_map_multi_prog,
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"bond2"))
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goto out;
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restore_root_netns();
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if (send_udp_packets(BOND_MODE_ROUNDROBIN))
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goto out;
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veth1_1_rx = get_rx_packets("veth1_1");
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veth1_2_rx = get_rx_packets("veth1_2");
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ASSERT_EQ(veth1_1_rx, 0, "expected no packets on veth1_1");
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ASSERT_GE(veth1_2_rx, NPACKETS, "expected packets on veth1_2");
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out:
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restore_root_netns();
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bonding_cleanup(skeletons);
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}
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/* Test that XDP programs cannot be attached to both the bond master and slaves simultaneously */
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static void test_xdp_bonding_attach(struct skeletons *skeletons)
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{
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struct bpf_link *link = NULL;
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struct bpf_link *link2 = NULL;
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int veth, bond;
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int err;
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if (!ASSERT_OK(system("ip link add veth type veth"), "add veth"))
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goto out;
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if (!ASSERT_OK(system("ip link add bond type bond"), "add bond"))
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goto out;
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veth = if_nametoindex("veth");
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if (!ASSERT_GE(veth, 0, "if_nametoindex veth"))
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goto out;
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bond = if_nametoindex("bond");
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if (!ASSERT_GE(bond, 0, "if_nametoindex bond"))
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goto out;
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/* enslaving with a XDP program loaded fails */
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link = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, veth);
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if (!ASSERT_OK_PTR(link, "attach program to veth"))
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goto out;
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err = system("ip link set veth master bond");
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if (!ASSERT_NEQ(err, 0, "attaching slave with xdp program expected to fail"))
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goto out;
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bpf_link__destroy(link);
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link = NULL;
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err = system("ip link set veth master bond");
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if (!ASSERT_OK(err, "set veth master"))
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goto out;
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/* attaching to slave when master has no program is allowed */
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link = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, veth);
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if (!ASSERT_OK_PTR(link, "attach program to slave when enslaved"))
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goto out;
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/* attaching to master not allowed when slave has program loaded */
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link2 = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, bond);
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if (!ASSERT_ERR_PTR(link2, "attach program to master when slave has program"))
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goto out;
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bpf_link__destroy(link);
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link = NULL;
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/* attaching XDP program to master allowed when slave has no program */
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link = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, bond);
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if (!ASSERT_OK_PTR(link, "attach program to master"))
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goto out;
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/* attaching to slave not allowed when master has program loaded */
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link2 = bpf_program__attach_xdp(skeletons->xdp_dummy->progs.xdp_dummy_prog, bond);
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ASSERT_ERR_PTR(link2, "attach program to slave when master has program");
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out:
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bpf_link__destroy(link);
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bpf_link__destroy(link2);
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||||
system("ip link del veth");
|
||||
system("ip link del bond");
|
||||
}
|
||||
|
||||
static int libbpf_debug_print(enum libbpf_print_level level,
|
||||
const char *format, va_list args)
|
||||
{
|
||||
if (level != LIBBPF_WARN)
|
||||
vprintf(format, args);
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct bond_test_case {
|
||||
char *name;
|
||||
int mode;
|
||||
int xmit_policy;
|
||||
};
|
||||
|
||||
static struct bond_test_case bond_test_cases[] = {
|
||||
{ "xdp_bonding_roundrobin", BOND_MODE_ROUNDROBIN, BOND_XMIT_POLICY_LAYER23, },
|
||||
{ "xdp_bonding_activebackup", BOND_MODE_ACTIVEBACKUP, BOND_XMIT_POLICY_LAYER23 },
|
||||
|
||||
{ "xdp_bonding_xor_layer2", BOND_MODE_XOR, BOND_XMIT_POLICY_LAYER2, },
|
||||
{ "xdp_bonding_xor_layer23", BOND_MODE_XOR, BOND_XMIT_POLICY_LAYER23, },
|
||||
{ "xdp_bonding_xor_layer34", BOND_MODE_XOR, BOND_XMIT_POLICY_LAYER34, },
|
||||
};
|
||||
|
||||
void test_xdp_bonding(void)
|
||||
{
|
||||
libbpf_print_fn_t old_print_fn;
|
||||
struct skeletons skeletons = {};
|
||||
int i;
|
||||
|
||||
old_print_fn = libbpf_set_print(libbpf_debug_print);
|
||||
|
||||
root_netns_fd = open("/proc/self/ns/net", O_RDONLY);
|
||||
if (!ASSERT_GE(root_netns_fd, 0, "open /proc/self/ns/net"))
|
||||
goto out;
|
||||
|
||||
skeletons.xdp_dummy = xdp_dummy__open_and_load();
|
||||
if (!ASSERT_OK_PTR(skeletons.xdp_dummy, "xdp_dummy__open_and_load"))
|
||||
goto out;
|
||||
|
||||
skeletons.xdp_tx = xdp_tx__open_and_load();
|
||||
if (!ASSERT_OK_PTR(skeletons.xdp_tx, "xdp_tx__open_and_load"))
|
||||
goto out;
|
||||
|
||||
skeletons.xdp_redirect_multi_kern = xdp_redirect_multi_kern__open_and_load();
|
||||
if (!ASSERT_OK_PTR(skeletons.xdp_redirect_multi_kern,
|
||||
"xdp_redirect_multi_kern__open_and_load"))
|
||||
goto out;
|
||||
|
||||
if (!test__start_subtest("xdp_bonding_attach"))
|
||||
test_xdp_bonding_attach(&skeletons);
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(bond_test_cases); i++) {
|
||||
struct bond_test_case *test_case = &bond_test_cases[i];
|
||||
|
||||
if (!test__start_subtest(test_case->name))
|
||||
test_xdp_bonding_with_mode(
|
||||
&skeletons,
|
||||
test_case->mode,
|
||||
test_case->xmit_policy);
|
||||
}
|
||||
|
||||
if (!test__start_subtest("xdp_bonding_redirect_multi"))
|
||||
test_xdp_bonding_redirect_multi(&skeletons);
|
||||
|
||||
out:
|
||||
xdp_dummy__destroy(skeletons.xdp_dummy);
|
||||
xdp_tx__destroy(skeletons.xdp_tx);
|
||||
xdp_redirect_multi_kern__destroy(skeletons.xdp_redirect_multi_kern);
|
||||
|
||||
libbpf_set_print(old_print_fn);
|
||||
if (root_netns_fd >= 0)
|
||||
close(root_netns_fd);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user