Verify that socket lookup via TC/XDP with all BPF APIs is VRF aware.
Reviewed-by: Eyal Birger <eyal.birger@xxxxxxxxx>
Signed-off-by: Gilad Sever <gilad9366@xxxxxxxxx>
---
v2: Fix build by initializing vars with -1
---
v3: Added xdp tests as suggested by Daniel Borkmann
v3: Use start_server() to avoid duplicate code as suggested by
Stanislav Fomichev
---
.../bpf/prog_tests/vrf_socket_lookup.c | 327 ++++++++++++++++++
.../selftests/bpf/progs/vrf_socket_lookup.c | 88 +++++
2 files changed, 415 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/vrf_socket_lookup.c
create mode 100644 tools/testing/selftests/bpf/progs/vrf_socket_lookup.c
diff --git a/tools/testing/selftests/bpf/prog_tests/vrf_socket_lookup.c b/tools/testing/selftests/bpf/prog_tests/vrf_socket_lookup.c
new file mode 100644
index 000000000000..b0b8791f4968
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/vrf_socket_lookup.c
@@ -0,0 +1,327 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+
+/*
+ * Topology:
+ * ---------
+ * NS0 namespace | NS1 namespace
+ * |
+ * +--------------+ | +--------------+
+ * | veth01 |----------| veth10 |
+ * | 172.16.1.100 | | | 172.16.1.200 |
+ * | bpf | | +--------------+
+ * +--------------+ |
+ * server(UDP/TCP) |
+ * +-------------------+ |
+ * | vrf1 | |
+ * | +--------------+ | | +--------------+
+ * | | veth02 |----------| veth20 |
+ * | | 172.16.2.100 | | | | 172.16.2.200 |
+ * | | bpf | | | +--------------+
+ * | +--------------+ | |
+ * | server(UDP/TCP) | |
+ * +-------------------+ |
+ *
+ * Test flow
+ * -----------
+ * The tests verifies that socket lookup via TC is VRF aware:
+ * 1) Creates two veth pairs between NS0 and NS1:
+ * a) veth01 <-> veth10 outside the VRF
+ * b) veth02 <-> veth20 in the VRF
+ * 2) Attaches to veth01 and veth02 a program that calls:
+ * a) bpf_skc_lookup_tcp() with TCP and tcp_skc is true
+ * b) bpf_sk_lookup_tcp() with TCP and tcp_skc is false
+ * c) bpf_sk_lookup_udp() with UDP
+ * The program stores the lookup result in bss->lookup_status.
+ * 3) Creates a socket TCP/UDP server in/outside the VRF.
+ * 4) The test expects lookup_status to be:
+ * a) 0 from device in VRF to server outside VRF
+ * b) 0 from device outside VRF to server in VRF
+ * c) 1 from device in VRF to server in VRF
+ * d) 1 from device outside VRF to server outside VRF
+ */
+
+#include <net/if.h>
+
+#include "test_progs.h"
+#include "network_helpers.h"
+#include "vrf_socket_lookup.skel.h"
+
+#define NS0 "vrf_socket_lookup_0"
+#define NS1 "vrf_socket_lookup_1"
+
+#define IP4_ADDR_VETH01 "172.16.1.100"
+#define IP4_ADDR_VETH10 "172.16.1.200"
+#define IP4_ADDR_VETH02 "172.16.2.100"
+#define IP4_ADDR_VETH20 "172.16.2.200"
+
+#define NON_VRF_PORT 5000
+#define IN_VRF_PORT 5001
+
+#define TIMEOUT_MS 3000
+
+#define SYS(fmt, ...) \
+ ({ \
+ char cmd[1024]; \
+ snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__); \
+ if (!ASSERT_OK(system(cmd), cmd)) \
+ goto fail; \
+ })
+
+#define SYS_NOFAIL(fmt, ...) \
+ ({ \
+ char cmd[1024]; \
+ snprintf(cmd, sizeof(cmd), fmt, ##__VA_ARGS__); \
+ system(cmd); \
+ })
+
+static int make_socket(int sotype, const char *ip, int port,
+ struct sockaddr_storage *addr)
+{
+ int err, fd;
+
+ err = make_sockaddr(AF_INET, ip, port, addr, NULL);
+ if (!ASSERT_OK(err, "make_address"))
+ return -1;
+
+ fd = socket(AF_INET, sotype, 0);
+ if (!ASSERT_GE(fd, 0, "socket"))
+ return -1;
+
+ if (!ASSERT_OK(settimeo(fd, TIMEOUT_MS), "settimeo"))
+ goto fail;
+
+ return fd;
+fail:
+ close(fd);
+ return -1;
+}
+
+static int make_server(int sotype, const char *ip, int port, const char *ifname)
+{
+ int err, fd = -1;
+
+ fd = start_server(AF_INET, sotype, ip, port, TIMEOUT_MS);
+ if (!ASSERT_GE(fd, 0, "start_server"))
+ return -1;
+
+ if (ifname) {
+ err = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
+ ifname, strlen(ifname) + 1);
+ if (!ASSERT_OK(err, "setsockopt(SO_BINDTODEVICE)"))
+ goto fail;
+ }
+
+ return fd;
+fail:
+ close(fd);
+ return -1;
+}
+
+static int attach_progs(char *ifname, int tc_prog_fd, int xdp_prog_fd)
+{
+ LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 1,
+ .prog_fd = tc_prog_fd);
+ LIBBPF_OPTS(bpf_tc_hook, hook, .attach_point = BPF_TC_INGRESS);
+ int ret, ifindex;
+
+ ifindex = if_nametoindex(ifname);
+ if (!ASSERT_NEQ(ifindex, 0, "if_nametoindex"))
+ return -1;
+ hook.ifindex = ifindex;
+
+ ret = bpf_tc_hook_create(&hook);
+ if (!ASSERT_OK(ret, "bpf_tc_hook_create"))
+ return ret;
+
+ ret = bpf_tc_attach(&hook, &opts);
+ if (!ASSERT_OK(ret, "bpf_tc_attach")) {
+ bpf_tc_hook_destroy(&hook);
+ return ret;
+ }
+ ret = bpf_xdp_attach(ifindex, xdp_prog_fd, 0, NULL);
+ if (!ASSERT_OK(ret, "bpf_xdp_attach")) {
+ bpf_tc_hook_destroy(&hook);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void cleanup(void)
+{
+ SYS_NOFAIL("test -f /var/run/netns/" NS0 " && ip netns delete "
+ NS0);
+ SYS_NOFAIL("test -f /var/run/netns/" NS1 " && ip netns delete "
+ NS1);
+}
+
+static int setup(struct vrf_socket_lookup *skel)
+{
+ int tc_prog_fd, xdp_prog_fd, ret = 0;
+ struct nstoken *nstoken = NULL;
+
+ SYS("ip netns add " NS0);
+ SYS("ip netns add " NS1);
+
+ /* NS0 <-> NS1 [veth01 <-> veth10] */
+ SYS("ip link add veth01 netns " NS0 " type veth peer name veth10 netns "
+ NS1);
+ SYS("ip -net " NS0 " addr add " IP4_ADDR_VETH01 "/24 dev veth01");
+ SYS("ip -net " NS0 " link set dev veth01 up");
+ SYS("ip -net " NS1 " addr add " IP4_ADDR_VETH10 "/24 dev veth10");
+ SYS("ip -net " NS1 " link set dev veth10 up");
+
+ /* NS0 <-> NS1 [veth02 <-> veth20] */
+ SYS("ip link add veth02 netns " NS0 " type veth peer name veth20 netns "
+ NS1);
+ SYS("ip -net " NS0 " addr add " IP4_ADDR_VETH02 "/24 dev veth02");
+ SYS("ip -net " NS0 " link set dev veth02 up");
+ SYS("ip -net " NS1 " addr add " IP4_ADDR_VETH20 "/24 dev veth20");
+ SYS("ip -net " NS1 " link set dev veth20 up");
+
+ /* veth02 -> vrf1 */
+ SYS("ip -net " NS0 " link add vrf1 type vrf table 11");
+ SYS("ip -net " NS0 " route add vrf vrf1 unreachable default metric "
+ "4278198272");
+ SYS("ip -net " NS0 " link set vrf1 alias vrf");
+ SYS("ip -net " NS0 " link set vrf1 up");
+ SYS("ip -net " NS0 " link set veth02 master vrf1");
+
+ /* Attach TC and XDP progs to veth devices in NS0 */
+ nstoken = open_netns(NS0);
+ if (!ASSERT_OK_PTR(nstoken, "setns " NS0))
+ goto fail;
+ tc_prog_fd = bpf_program__fd(skel->progs.tc_socket_lookup);
+ if (!ASSERT_GE(tc_prog_fd, 0, "bpf_program__tc_fd"))
+ goto fail;
+ xdp_prog_fd = bpf_program__fd(skel->progs.xdp_socket_lookup);
+ if (!ASSERT_GE(xdp_prog_fd, 0, "bpf_program__xdp_fd"))
+ goto fail;
+
+ if (attach_progs("veth01", tc_prog_fd, xdp_prog_fd))
+ goto fail;
+
+ if (attach_progs("veth02", tc_prog_fd, xdp_prog_fd))
+ goto fail;
+
+ goto close;
+fail:
+ ret = -1;
+close:
+ if (nstoken)
+ close_netns(nstoken);
+ return ret;
+}
+
+static int test_lookup(struct vrf_socket_lookup *skel, int sotype,
+ const char *ip, int port, bool test_xdp, bool tcp_skc,
+ int lookup_status_exp)
+{
+ static const char msg[] = "Hello Server";
+ struct sockaddr_storage addr = {};
+ int fd, ret = 0;
+
+ fd = make_socket(sotype, ip, port, &addr);
+ if (fd < 0)
+ return -1;
+
+ skel->bss->test_xdp = test_xdp;
+ skel->bss->tcp_skc = tcp_skc;
+ skel->bss->lookup_status = -1;
+
+ if (sotype == SOCK_STREAM)
+ connect(fd, (void *)&addr, sizeof(struct sockaddr_in));
+ else
+ sendto(fd, msg, sizeof(msg), 0, (void *)&addr,
+ sizeof(struct sockaddr_in));
+
+ if (!ASSERT_EQ(skel->bss->lookup_status, lookup_status_exp,
+ "lookup_status"))
+ goto fail;
+
+ goto close;
+
+fail:
+ ret = -1;
+close:
+ close(fd);
+ return ret;
+}
+
+static void _test_vrf_socket_lookup(struct vrf_socket_lookup *skel, int sotype,
+ bool test_xdp, bool tcp_skc)
+{
+ int in_vrf_server = -1, non_vrf_server = -1;
+ struct nstoken *nstoken = NULL;
+
+ nstoken = open_netns(NS0);
+ if (!ASSERT_OK_PTR(nstoken, "setns " NS0))
+ goto done;
+
+ /* Open sockets in and outside VRF */
+ non_vrf_server = make_server(sotype, "0.0.0.0", NON_VRF_PORT, NULL);
+ if (!ASSERT_GE(non_vrf_server, 0, "make_server__outside_vrf_fd"))
+ goto done;
+
+ in_vrf_server = make_server(sotype, "0.0.0.0", IN_VRF_PORT, "veth02");
+ if (!ASSERT_GE(in_vrf_server, 0, "make_server__in_vrf_fd"))
+ goto done;
+
+ /* Perform test from NS1 */
+ close_netns(nstoken);
+ nstoken = open_netns(NS1);
+ if (!ASSERT_OK_PTR(nstoken, "setns " NS1))
+ goto done;
+
+ if (!ASSERT_OK(test_lookup(skel, sotype, IP4_ADDR_VETH02, NON_VRF_PORT,
+ test_xdp, tcp_skc, 0), "in_to_out"))
+ goto done;
+ if (!ASSERT_OK(test_lookup(skel, sotype, IP4_ADDR_VETH02, IN_VRF_PORT,
+ test_xdp, tcp_skc, 1), "in_to_in"))
+ goto done;
+ if (!ASSERT_OK(test_lookup(skel, sotype, IP4_ADDR_VETH01, NON_VRF_PORT,
+ test_xdp, tcp_skc, 1), "out_to_out"))
+ goto done;
+ if (!ASSERT_OK(test_lookup(skel, sotype, IP4_ADDR_VETH01, IN_VRF_PORT,
+ test_xdp, tcp_skc, 0), "out_to_in"))
+ goto done;
+
+done:
+ if (non_vrf_server >= 0)
+ close(non_vrf_server);
+ if (in_vrf_server >= 0)
+ close(in_vrf_server);
+ if (nstoken)
+ close_netns(nstoken);
+}
+
+void test_vrf_socket_lookup(void)
+{
+ struct vrf_socket_lookup *skel;
+
+ cleanup();
+
+ skel = vrf_socket_lookup__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "vrf_socket_lookup__open_and_load"))
+ return;
+
+ if (!ASSERT_OK(setup(skel), "setup"))
+ goto done;
+
+ if (test__start_subtest("tc_socket_lookup_tcp"))
+ _test_vrf_socket_lookup(skel, SOCK_STREAM, false, false);
+ if (test__start_subtest("tc_socket_lookup_tcp_skc"))
+ _test_vrf_socket_lookup(skel, SOCK_STREAM, false, false);
+ if (test__start_subtest("tc_socket_lookup_udp"))
+ _test_vrf_socket_lookup(skel, SOCK_STREAM, false, false);
+ if (test__start_subtest("xdp_socket_lookup_tcp"))
+ _test_vrf_socket_lookup(skel, SOCK_STREAM, true, false);
+ if (test__start_subtest("xdp_socket_lookup_tcp_skc"))
+ _test_vrf_socket_lookup(skel, SOCK_STREAM, true, false);
+ if (test__start_subtest("xdp_socket_lookup_udp"))
+ _test_vrf_socket_lookup(skel, SOCK_STREAM, true, false);
+
+done:
+ vrf_socket_lookup__destroy(skel);
+ cleanup();
+}
diff --git a/tools/testing/selftests/bpf/progs/vrf_socket_lookup.c b/tools/testing/selftests/bpf/progs/vrf_socket_lookup.c
new file mode 100644
index 000000000000..26e07a252585
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/vrf_socket_lookup.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <linux/ip.h>
+#include <linux/in.h>
+#include <linux/if_ether.h>
+#include <linux/pkt_cls.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+#include <stdbool.h>
+
+int lookup_status;
+bool test_xdp;
+bool tcp_skc;
+
+#define CUR_NS BPF_F_CURRENT_NETNS
+
+static void socket_lookup(void *ctx, void *data_end, void *data)
+{
+ struct ethhdr *eth = data;
+ struct bpf_sock_tuple *tp;
+ struct bpf_sock *sk;
+ struct iphdr *iph;
+ int tplen;
+
+ if (eth + 1 > data_end)
+ return;
+
+ if (eth->h_proto != bpf_htons(ETH_P_IP))
+ return;
+
+ iph = (struct iphdr *)(eth + 1);
+ if (iph + 1 > data_end)
+ return;
+
+ tp = (struct bpf_sock_tuple *)&iph->saddr;
+ tplen = sizeof(tp->ipv4);
+ if ((void *)tp + tplen > data_end)
+ return;
+
+ switch (iph->protocol) {
+ case IPPROTO_TCP:
+ if (tcp_skc)
+ sk = bpf_skc_lookup_tcp(ctx, tp, tplen, CUR_NS, 0);
+ else
+ sk = bpf_sk_lookup_tcp(ctx, tp, tplen, CUR_NS, 0);
+ break;
+ case IPPROTO_UDP:
+ sk = bpf_sk_lookup_udp(ctx, tp, tplen, CUR_NS, 0);
+ break;
+ default:
+ return;
+ }
+
+ lookup_status = 0;
+
+ if (sk) {
+ bpf_sk_release(sk);
+ lookup_status = 1;
+ }
+}
+
+SEC("tc")
+int tc_socket_lookup(struct __sk_buff *skb)
+{
+ void *data_end = (void *)(long)skb->data_end;
+ void *data = (void *)(long)skb->data;
+
+ if (test_xdp)
+ return TC_ACT_UNSPEC;
+
+ socket_lookup(skb, data_end, data);
+ return TC_ACT_UNSPEC;
+}
+
+SEC("xdp")
+int xdp_socket_lookup(struct xdp_md *xdp)
+{
+ void *data_end = (void *)(long)xdp->data_end;
+ void *data = (void *)(long)xdp->data;
+
+ if (!test_xdp)
+ return XDP_PASS;
+
+ socket_lookup(xdp, data_end, data);
+ return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.34.1
