Introduce e2e selftest for bpf_xdp_flow_offload_lookup kfunc through
xdp_flowtable utility.
Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
---
tools/testing/selftests/bpf/Makefile | 10 +-
tools/testing/selftests/bpf/config | 4 +
.../selftests/bpf/progs/xdp_flowtable.c | 141 +++++++++++++++++
.../selftests/bpf/test_xdp_flowtable.sh | 112 ++++++++++++++
tools/testing/selftests/bpf/xdp_flowtable.c | 142 ++++++++++++++++++
5 files changed, 407 insertions(+), 2 deletions(-)
create mode 100644 tools/testing/selftests/bpf/progs/xdp_flowtable.c
create mode 100755 tools/testing/selftests/bpf/test_xdp_flowtable.sh
create mode 100644 tools/testing/selftests/bpf/xdp_flowtable.c
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index e0b3887b3d2df..7361c429bed62 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -133,7 +133,8 @@ TEST_PROGS := test_kmod.sh \
test_bpftool_metadata.sh \
test_doc_build.sh \
test_xsk.sh \
- test_xdp_features.sh
+ test_xdp_features.sh \
+ test_xdp_flowtable.sh
TEST_PROGS_EXTENDED := with_addr.sh \
with_tunnels.sh ima_setup.sh verify_sig_setup.sh \
@@ -144,7 +145,7 @@ TEST_GEN_PROGS_EXTENDED = test_skb_cgroup_id_user \
flow_dissector_load test_flow_dissector test_tcp_check_syncookie_user \
test_lirc_mode2_user xdping test_cpp runqslower bench bpf_testmod.ko \
xskxceiver xdp_redirect_multi xdp_synproxy veristat xdp_hw_metadata \
- xdp_features bpf_test_no_cfi.ko
+ xdp_features bpf_test_no_cfi.ko xdp_flowtable
TEST_GEN_FILES += liburandom_read.so urandom_read sign-file uprobe_multi
@@ -476,6 +477,7 @@ test_usdt.skel.h-deps := test_usdt.bpf.o test_usdt_multispec.bpf.o
xsk_xdp_progs.skel.h-deps := xsk_xdp_progs.bpf.o
xdp_hw_metadata.skel.h-deps := xdp_hw_metadata.bpf.o
xdp_features.skel.h-deps := xdp_features.bpf.o
+xdp_flowtable.skel.h-deps := xdp_flowtable.bpf.o
LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
@@ -710,6 +712,10 @@ $(OUTPUT)/xdp_features: xdp_features.c $(OUTPUT)/network_helpers.o $(OUTPUT)/xdp
$(call msg,BINARY,,$@)
$(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
+$(OUTPUT)/xdp_flowtable: xdp_flowtable.c $(OUTPUT)/xdp_flowtable.skel.h | $(OUTPUT)
+ $(call msg,BINARY,,$@)
+ $(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
+
# Make sure we are able to include and link libbpf against c++.
$(OUTPUT)/test_cpp: test_cpp.cpp $(OUTPUT)/test_core_extern.skel.h $(BPFOBJ)
$(call msg,CXX,,$@)
diff --git a/tools/testing/selftests/bpf/config b/tools/testing/selftests/bpf/config
index eeabd798bc3ae..1a9aea01145f7 100644
--- a/tools/testing/selftests/bpf/config
+++ b/tools/testing/selftests/bpf/config
@@ -82,6 +82,10 @@ CONFIG_NF_CONNTRACK=y
CONFIG_NF_CONNTRACK_MARK=y
CONFIG_NF_DEFRAG_IPV4=y
CONFIG_NF_DEFRAG_IPV6=y
+CONFIG_NF_TABLES=y
+CONFIG_NETFILTER_INGRESS=y
+CONFIG_NF_FLOW_TABLE=y
+CONFIG_NF_FLOW_TABLE_INET=y
CONFIG_NF_NAT=y
CONFIG_RC_CORE=y
CONFIG_SECURITY=y
diff --git a/tools/testing/selftests/bpf/progs/xdp_flowtable.c b/tools/testing/selftests/bpf/progs/xdp_flowtable.c
new file mode 100644
index 0000000000000..888ac87790f90
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/xdp_flowtable.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <vmlinux.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+
+#define MAX_ERRNO 4095
+
+#define ETH_P_IP 0x0800
+#define ETH_P_IPV6 0x86dd
+#define IP_MF 0x2000 /* "More Fragments" */
+#define IP_OFFSET 0x1fff /* "Fragment Offset" */
+#define AF_INET 2
+#define AF_INET6 10
+
+struct flow_offload_tuple_rhash *
+bpf_xdp_flow_offload_lookup(struct xdp_md *,
+ struct bpf_fib_lookup *) __ksym;
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __type(key, __u32);
+ __type(value, __u32);
+ __uint(max_entries, 1);
+} stats SEC(".maps");
+
+static __always_inline bool
+xdp_flowtable_offload_check_iphdr(struct iphdr *iph)
+{
+ /* ip fragmented traffic */
+ if (iph->frag_off & bpf_htons(IP_MF | IP_OFFSET))
+ return false;
+
+ /* ip options */
+ if (iph->ihl * 4 != sizeof(*iph))
+ return false;
+
+ if (iph->ttl <= 1)
+ return false;
+
+ return true;
+}
+
+static __always_inline bool
+xdp_flowtable_offload_check_tcp_state(void *ports, void *data_end, u8 proto)
+{
+ if (proto == IPPROTO_TCP) {
+ struct tcphdr *tcph = ports;
+
+ if (tcph + 1 > data_end)
+ return false;
+
+ if (tcph->fin || tcph->rst)
+ return false;
+ }
+
+ return true;
+}
+
+SEC("xdp.frags")
+int xdp_flowtable_do_lookup(struct xdp_md *ctx)
+{
+ void *data_end = (void *)(long)ctx->data_end;
+ struct flow_offload_tuple_rhash *tuplehash;
+ struct bpf_fib_lookup tuple = {
+ .ifindex = ctx->ingress_ifindex,
+ };
+ void *data = (void *)(long)ctx->data;
+ struct ethhdr *eth = data;
+ struct flow_ports *ports;
+ __u32 *val, key = 0;
+
+ if (eth + 1 > data_end)
+ return XDP_DROP;
+
+ switch (eth->h_proto) {
+ case bpf_htons(ETH_P_IP): {
+ struct iphdr *iph = data + sizeof(*eth);
+
+ ports = (struct flow_ports *)(iph + 1);
+ if (ports + 1 > data_end)
+ return XDP_PASS;
+
+ /* sanity check on ip header */
+ if (!xdp_flowtable_offload_check_iphdr(iph))
+ return XDP_PASS;
+
+ if (!xdp_flowtable_offload_check_tcp_state(ports, data_end,
+ iph->protocol))
+ return XDP_PASS;
+
+ tuple.family = AF_INET;
+ tuple.tos = iph->tos;
+ tuple.l4_protocol = iph->protocol;
+ tuple.tot_len = bpf_ntohs(iph->tot_len);
+ tuple.ipv4_src = iph->saddr;
+ tuple.ipv4_dst = iph->daddr;
+ tuple.sport = ports->source;
+ tuple.dport = ports->dest;
+ break;
+ }
+ case bpf_htons(ETH_P_IPV6): {
+ struct in6_addr *src = (struct in6_addr *)tuple.ipv6_src;
+ struct in6_addr *dst = (struct in6_addr *)tuple.ipv6_dst;
+ struct ipv6hdr *ip6h = data + sizeof(*eth);
+
+ ports = (struct flow_ports *)(ip6h + 1);
+ if (ports + 1 > data_end)
+ return XDP_PASS;
+
+ if (ip6h->hop_limit <= 1)
+ return XDP_PASS;
+
+ if (!xdp_flowtable_offload_check_tcp_state(ports, data_end,
+ ip6h->nexthdr))
+ return XDP_PASS;
+
+ tuple.family = AF_INET6;
+ tuple.l4_protocol = ip6h->nexthdr;
+ tuple.tot_len = bpf_ntohs(ip6h->payload_len);
+ *src = ip6h->saddr;
+ *dst = ip6h->daddr;
+ tuple.sport = ports->source;
+ tuple.dport = ports->dest;
+ break;
+ }
+ default:
+ return XDP_PASS;
+ }
+
+ tuplehash = bpf_xdp_flow_offload_lookup(ctx, &tuple);
+ if (!tuplehash)
+ return XDP_PASS;
+
+ val = bpf_map_lookup_elem(&stats, &key);
+ if (val)
+ __sync_add_and_fetch(val, 1);
+
+ return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/test_xdp_flowtable.sh b/tools/testing/selftests/bpf/test_xdp_flowtable.sh
new file mode 100755
index 0000000000000..1a8a40aebbdf1
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_xdp_flowtable.sh
@@ -0,0 +1,112 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+readonly NS0="ns0-$(mktemp -u XXXXXX)"
+readonly NS1="ns1-$(mktemp -u XXXXXX)"
+readonly infile="$(mktemp)"
+readonly outfile="$(mktemp)"
+
+xdp_flowtable_pid=""
+ret=1
+
+setup_flowtable() {
+nft -f /dev/stdin <<EOF
+table inet nat {
+ chain postrouting {
+ type nat hook postrouting priority filter; policy accept;
+ meta oif v10 masquerade
+ }
+}
+table inet filter {
+ flowtable ft {
+ hook ingress priority filter
+ devices = { v01, v10 }
+ }
+ chain forward {
+ type filter hook forward priority filter
+ meta l4proto { tcp, udp } flow add @ft
+ }
+}
+EOF
+}
+
+setup() {
+ sysctl -w net.ipv4.ip_forward=1
+ sysctl -w net.ipv6.conf.all.forwarding=1
+
+ ip netns add ${NS0}
+ ip netns add ${NS1}
+
+ ip link add v01 type veth peer name v00 netns ${NS0}
+ ip link add v10 type veth peer name v11 netns ${NS1}
+
+ ip -n ${NS0} addr add 192.168.0.1/24 dev v00
+ ip -6 -n ${NS0} addr add 2001:db8::1/64 dev v00
+ ip -n ${NS0} link set dev v00 up
+ ip -n ${NS0} route add default via 192.168.0.2
+ ip -6 -n ${NS0} route add default via 2001:db8::2
+
+ ip addr add 192.168.0.2/24 dev v01
+ ip -6 addr add 2001:db8::2/64 dev v01
+ ip link set dev v01 up
+ ip addr add 192.168.1.1/24 dev v10
+ ip -6 addr add 2001:db8:1::1/64 dev v10
+ ip link set dev v10 up
+
+ ip -n ${NS1} addr add 192.168.1.2/24 dev v11
+ ip -6 -n ${NS1} addr add 2001:db8:1::2/64 dev v11
+ ip -n ${NS1} link set dev v11 up
+ ip -n ${NS1} route add default via 192.168.1.1
+ ip -6 -n ${NS1} route add default via 2001:db8:1::1
+
+ # Load XDP program
+ ./xdp_flowtable v01 &
+ xdp_flowtable_pid=$!
+
+ setup_flowtable
+
+ dd if=/dev/urandom of="${infile}" bs=8192 count=16 status=none
+}
+
+wait_for_nc_server() {
+ while sleep 1; do
+ ip netns exec ${NS1} ss -nutlp | grep -q ":$1"
+ [ $? -eq 0 ] && break
+ done
+}
+
+cleanup() {
+ {
+ rm -f "${infile}" "${outfile}"
+
+ nft delete table inet filter
+ nft delete table inet nat
+
+ ip link del v01
+ ip link del v10
+
+ ip netns del ${NS0}
+ ip netns del ${NS1}
+ } >/dev/null 2>/dev/null
+}
+
+test_xdp_flowtable_lookup() {
+ ## Run IPv4 test
+ ip netns exec ${NS1} nc -4 --no-shutdown -l 8084 > ${outfile} &
+ wait_for_nc_server 8084
+ ip netns exec ${NS0} timeout 2 nc -4 192.168.1.2 8084 < ${infile}
+
+ ## Run IPv6 test
+ ip netns exec ${NS1} nc -6 --no-shutdown -l 8086 > ${outfile} &
+ wait_for_nc_server 8086
+ ip netns exec ${NS0} timeout 2 nc -6 2001:db8:1::2 8086 < ${infile}
+
+ wait $xdp_flowtable_pid && ret=0
+}
+
+trap cleanup 0 2 3 6 9
+setup
+
+test_xdp_flowtable_lookup
+
+exit $ret
diff --git a/tools/testing/selftests/bpf/xdp_flowtable.c b/tools/testing/selftests/bpf/xdp_flowtable.c
new file mode 100644
index 0000000000000..dea24deda7359
--- /dev/null
+++ b/tools/testing/selftests/bpf/xdp_flowtable.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <uapi/linux/bpf.h>
+#include <linux/if_link.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+#include <signal.h>
+#include <argp.h>
+
+#include "xdp_flowtable.skel.h"
+
+#define MAX_ITERATION 10
+
+static volatile bool exiting, verbosity;
+static char ifname[IF_NAMESIZE];
+static int ifindex = -ENODEV;
+const char *argp_program_version = "xdp-flowtable 0.0";
+const char argp_program_doc[] =
+"XDP flowtable application.\n"
+"\n"
+"USAGE: ./xdp-flowtable [-v] <iface-name>\n";
+
+static const struct argp_option opts[] = {
+ { "verbose", 'v', NULL, 0, "Verbose debug output" },
+ {},
+};
+
+static void sig_handler(int sig)
+{
+ exiting = true;
+}
+
+static int libbpf_print_fn(enum libbpf_print_level level,
+ const char *format, va_list args)
+{
+ if (level == LIBBPF_DEBUG && !verbosity)
+ return 0;
+ return vfprintf(stderr, format, args);
+}
+
+static error_t parse_arg(int key, char *arg, struct argp_state *state)
+{
+ switch (key) {
+ case 'v':
+ verbosity = true;
+ break;
+ case ARGP_KEY_ARG:
+ errno = 0;
+ if (strlen(arg) >= IF_NAMESIZE) {
+ fprintf(stderr, "Invalid device name: %s\n", arg);
+ argp_usage(state);
+ return ARGP_ERR_UNKNOWN;
+ }
+
+ ifindex = if_nametoindex(arg);
+ if (!ifindex)
+ ifindex = strtoul(arg, NULL, 0);
+ if (!ifindex || !if_indextoname(ifindex, ifname)) {
+ fprintf(stderr,
+ "Bad interface index or name (%d): %s\n",
+ errno, strerror(errno));
+ argp_usage(state);
+ return ARGP_ERR_UNKNOWN;
+ }
+ break;
+ default:
+ return ARGP_ERR_UNKNOWN;
+ }
+
+ return 0;
+}
+
+static const struct argp argp = {
+ .options = opts,
+ .parser = parse_arg,
+ .doc = argp_program_doc,
+};
+
+int main(int argc, char **argv)
+{
+ unsigned int count = 0, key = 0;
+ struct xdp_flowtable *skel;
+ int i, err;
+
+ libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+ libbpf_set_print(libbpf_print_fn);
+
+ signal(SIGINT, sig_handler);
+ signal(SIGTERM, sig_handler);
+
+ /* Parse command line arguments */
+ err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
+ if (err)
+ return err;
+
+ /* Load and verify BPF application */
+ skel = xdp_flowtable__open();
+ if (!skel) {
+ fprintf(stderr, "Failed to open and load BPF skeleton\n");
+ return -EINVAL;
+ }
+
+ /* Load & verify BPF programs */
+ err = xdp_flowtable__load(skel);
+ if (err) {
+ fprintf(stderr, "Failed to load and verify BPF skeleton\n");
+ goto cleanup;
+ }
+
+ /* Attach the XDP program */
+ err = xdp_flowtable__attach(skel);
+ if (err) {
+ fprintf(stderr, "Failed to attach BPF skeleton\n");
+ goto cleanup;
+ }
+
+ err = bpf_xdp_attach(ifindex,
+ bpf_program__fd(skel->progs.xdp_flowtable_do_lookup),
+ XDP_FLAGS_DRV_MODE, NULL);
+ if (err) {
+ fprintf(stderr, "Failed attaching XDP program to device %s\n",
+ ifname);
+ goto cleanup;
+ }
+
+ /* Collect stats */
+ for (i = 0; i < MAX_ITERATION && !exiting; i++)
+ sleep(1);
+
+ /* Check results */
+ err = bpf_map__lookup_elem(skel->maps.stats, &key, sizeof(key),
+ &count, sizeof(count), 0);
+ if (!err && !count)
+ err = -EINVAL;
+
+ bpf_xdp_detach(ifindex, XDP_FLAGS_DRV_MODE, NULL);
+cleanup:
+ xdp_flowtable__destroy(skel);
+
+ return err;
+}
--
2.45.1
