diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/fib_lookup.c')
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/fib_lookup.c | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/fib_lookup.c b/tools/testing/selftests/bpf/prog_tests/fib_lookup.c new file mode 100644 index 000000000000..bd7658958004 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/fib_lookup.c @@ -0,0 +1,377 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */ + +#include <linux/rtnetlink.h> +#include <sys/types.h> +#include <net/if.h> + +#include "test_progs.h" +#include "network_helpers.h" +#include "fib_lookup.skel.h" + +#define NS_TEST "fib_lookup_ns" +#define IPV6_IFACE_ADDR "face::face" +#define IPV6_IFACE_ADDR_SEC "cafe::cafe" +#define IPV6_ADDR_DST "face::3" +#define IPV6_NUD_FAILED_ADDR "face::1" +#define IPV6_NUD_STALE_ADDR "face::2" +#define IPV4_IFACE_ADDR "10.0.0.254" +#define IPV4_IFACE_ADDR_SEC "10.1.0.254" +#define IPV4_ADDR_DST "10.2.0.254" +#define IPV4_NUD_FAILED_ADDR "10.0.0.1" +#define IPV4_NUD_STALE_ADDR "10.0.0.2" +#define IPV4_TBID_ADDR "172.0.0.254" +#define IPV4_TBID_NET "172.0.0.0" +#define IPV4_TBID_DST "172.0.0.2" +#define IPV6_TBID_ADDR "fd00::FFFF" +#define IPV6_TBID_NET "fd00::" +#define IPV6_TBID_DST "fd00::2" +#define MARK_NO_POLICY 33 +#define MARK 42 +#define MARK_TABLE "200" +#define IPV4_REMOTE_DST "1.2.3.4" +#define IPV4_LOCAL "10.4.0.3" +#define IPV4_GW1 "10.4.0.1" +#define IPV4_GW2 "10.4.0.2" +#define IPV6_REMOTE_DST "be:ef::b0:10" +#define IPV6_LOCAL "fd01::3" +#define IPV6_GW1 "fd01::1" +#define IPV6_GW2 "fd01::2" +#define DMAC "11:11:11:11:11:11" +#define DMAC_INIT { 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, } +#define DMAC2 "01:01:01:01:01:01" +#define DMAC_INIT2 { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, } + +struct fib_lookup_test { + const char *desc; + const char *daddr; + int expected_ret; + const char *expected_src; + const char *expected_dst; + int lookup_flags; + __u32 tbid; + __u8 dmac[6]; + __u32 mark; +}; + +static const struct fib_lookup_test tests[] = { + { .desc = "IPv6 failed neigh", + .daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_NO_NEIGH, }, + { .desc = "IPv6 stale neigh", + .daddr = IPV6_NUD_STALE_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .dmac = DMAC_INIT, }, + { .desc = "IPv6 skip neigh", + .daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, }, + { .desc = "IPv4 failed neigh", + .daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_NO_NEIGH, }, + { .desc = "IPv4 stale neigh", + .daddr = IPV4_NUD_STALE_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .dmac = DMAC_INIT, }, + { .desc = "IPv4 skip neigh", + .daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, }, + { .desc = "IPv4 TBID lookup failure", + .daddr = IPV4_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_NOT_FWDED, + .lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID, + .tbid = RT_TABLE_MAIN, }, + { .desc = "IPv4 TBID lookup success", + .daddr = IPV4_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID, .tbid = 100, + .dmac = DMAC_INIT2, }, + { .desc = "IPv6 TBID lookup failure", + .daddr = IPV6_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_NOT_FWDED, + .lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID, + .tbid = RT_TABLE_MAIN, }, + { .desc = "IPv6 TBID lookup success", + .daddr = IPV6_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID, .tbid = 100, + .dmac = DMAC_INIT2, }, + { .desc = "IPv4 set src addr from netdev", + .daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_src = IPV4_IFACE_ADDR, + .lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, }, + { .desc = "IPv6 set src addr from netdev", + .daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_src = IPV6_IFACE_ADDR, + .lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, }, + { .desc = "IPv4 set prefsrc addr from route", + .daddr = IPV4_ADDR_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_src = IPV4_IFACE_ADDR_SEC, + .lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, }, + { .desc = "IPv6 set prefsrc addr route", + .daddr = IPV6_ADDR_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_src = IPV6_IFACE_ADDR_SEC, + .lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, }, + /* policy routing */ + { .desc = "IPv4 policy routing, default", + .daddr = IPV4_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_dst = IPV4_GW1, + .lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH, }, + { .desc = "IPv4 policy routing, mark doesn't point to a policy", + .daddr = IPV4_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_dst = IPV4_GW1, + .lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH, + .mark = MARK_NO_POLICY, }, + { .desc = "IPv4 policy routing, mark points to a policy", + .daddr = IPV4_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_dst = IPV4_GW2, + .lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH, + .mark = MARK, }, + { .desc = "IPv4 policy routing, mark points to a policy, but no flag", + .daddr = IPV4_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_dst = IPV4_GW1, + .lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, + .mark = MARK, }, + { .desc = "IPv6 policy routing, default", + .daddr = IPV6_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_dst = IPV6_GW1, + .lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH, }, + { .desc = "IPv6 policy routing, mark doesn't point to a policy", + .daddr = IPV6_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_dst = IPV6_GW1, + .lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH, + .mark = MARK_NO_POLICY, }, + { .desc = "IPv6 policy routing, mark points to a policy", + .daddr = IPV6_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_dst = IPV6_GW2, + .lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH, + .mark = MARK, }, + { .desc = "IPv6 policy routing, mark points to a policy, but no flag", + .daddr = IPV6_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS, + .expected_dst = IPV6_GW1, + .lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, + .mark = MARK, }, +}; + +static int setup_netns(void) +{ + int err; + + SYS(fail, "ip link add veth1 type veth peer name veth2"); + SYS(fail, "ip link set dev veth1 up"); + SYS(fail, "ip link set dev veth2 up"); + + err = write_sysctl("/proc/sys/net/ipv4/neigh/veth1/gc_stale_time", "900"); + if (!ASSERT_OK(err, "write_sysctl(net.ipv4.neigh.veth1.gc_stale_time)")) + goto fail; + + err = write_sysctl("/proc/sys/net/ipv6/neigh/veth1/gc_stale_time", "900"); + if (!ASSERT_OK(err, "write_sysctl(net.ipv6.neigh.veth1.gc_stale_time)")) + goto fail; + + SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_IFACE_ADDR); + SYS(fail, "ip neigh add %s dev veth1 nud failed", IPV6_NUD_FAILED_ADDR); + SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud stale", IPV6_NUD_STALE_ADDR, DMAC); + + SYS(fail, "ip addr add %s/24 dev veth1", IPV4_IFACE_ADDR); + SYS(fail, "ip neigh add %s dev veth1 nud failed", IPV4_NUD_FAILED_ADDR); + SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud stale", IPV4_NUD_STALE_ADDR, DMAC); + + /* Setup for prefsrc IP addr selection */ + SYS(fail, "ip addr add %s/24 dev veth1", IPV4_IFACE_ADDR_SEC); + SYS(fail, "ip route add %s/32 dev veth1 src %s", IPV4_ADDR_DST, IPV4_IFACE_ADDR_SEC); + + SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_IFACE_ADDR_SEC); + SYS(fail, "ip route add %s/128 dev veth1 src %s", IPV6_ADDR_DST, IPV6_IFACE_ADDR_SEC); + + /* Setup for tbid lookup tests */ + SYS(fail, "ip addr add %s/24 dev veth2", IPV4_TBID_ADDR); + SYS(fail, "ip route del %s/24 dev veth2", IPV4_TBID_NET); + SYS(fail, "ip route add table 100 %s/24 dev veth2", IPV4_TBID_NET); + SYS(fail, "ip neigh add %s dev veth2 lladdr %s nud stale", IPV4_TBID_DST, DMAC2); + + SYS(fail, "ip addr add %s/64 dev veth2", IPV6_TBID_ADDR); + SYS(fail, "ip -6 route del %s/64 dev veth2", IPV6_TBID_NET); + SYS(fail, "ip -6 route add table 100 %s/64 dev veth2", IPV6_TBID_NET); + SYS(fail, "ip neigh add %s dev veth2 lladdr %s nud stale", IPV6_TBID_DST, DMAC2); + + err = write_sysctl("/proc/sys/net/ipv4/conf/veth1/forwarding", "1"); + if (!ASSERT_OK(err, "write_sysctl(net.ipv4.conf.veth1.forwarding)")) + goto fail; + + err = write_sysctl("/proc/sys/net/ipv6/conf/veth1/forwarding", "1"); + if (!ASSERT_OK(err, "write_sysctl(net.ipv6.conf.veth1.forwarding)")) + goto fail; + + /* Setup for policy routing tests */ + SYS(fail, "ip addr add %s/24 dev veth1", IPV4_LOCAL); + SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_LOCAL); + SYS(fail, "ip route add %s/32 via %s", IPV4_REMOTE_DST, IPV4_GW1); + SYS(fail, "ip route add %s/32 via %s table %s", IPV4_REMOTE_DST, IPV4_GW2, MARK_TABLE); + SYS(fail, "ip -6 route add %s/128 via %s", IPV6_REMOTE_DST, IPV6_GW1); + SYS(fail, "ip -6 route add %s/128 via %s table %s", IPV6_REMOTE_DST, IPV6_GW2, MARK_TABLE); + SYS(fail, "ip rule add prio 2 fwmark %d lookup %s", MARK, MARK_TABLE); + SYS(fail, "ip -6 rule add prio 2 fwmark %d lookup %s", MARK, MARK_TABLE); + + return 0; +fail: + return -1; +} + +static int set_lookup_params(struct bpf_fib_lookup *params, + const struct fib_lookup_test *test, + int ifindex) +{ + int ret; + + memset(params, 0, sizeof(*params)); + + params->l4_protocol = IPPROTO_TCP; + params->ifindex = ifindex; + params->tbid = test->tbid; + params->mark = test->mark; + + if (inet_pton(AF_INET6, test->daddr, params->ipv6_dst) == 1) { + params->family = AF_INET6; + if (!(test->lookup_flags & BPF_FIB_LOOKUP_SRC)) { + ret = inet_pton(AF_INET6, IPV6_IFACE_ADDR, params->ipv6_src); + if (!ASSERT_EQ(ret, 1, "inet_pton(IPV6_IFACE_ADDR)")) + return -1; + } + + return 0; + } + + ret = inet_pton(AF_INET, test->daddr, ¶ms->ipv4_dst); + if (!ASSERT_EQ(ret, 1, "convert IP[46] address")) + return -1; + params->family = AF_INET; + + if (!(test->lookup_flags & BPF_FIB_LOOKUP_SRC)) { + ret = inet_pton(AF_INET, IPV4_IFACE_ADDR, ¶ms->ipv4_src); + if (!ASSERT_EQ(ret, 1, "inet_pton(IPV4_IFACE_ADDR)")) + return -1; + } + + return 0; +} + +static void mac_str(char *b, const __u8 *mac) +{ + sprintf(b, "%02X:%02X:%02X:%02X:%02X:%02X", + mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); +} + +static void assert_ip_address(int family, void *addr, const char *expected_str) +{ + char str[INET6_ADDRSTRLEN]; + u8 expected_addr[16]; + int addr_len = 0; + int ret; + + switch (family) { + case AF_INET6: + ret = inet_pton(AF_INET6, expected_str, expected_addr); + ASSERT_EQ(ret, 1, "inet_pton(AF_INET6, expected_str)"); + addr_len = 16; + break; + case AF_INET: + ret = inet_pton(AF_INET, expected_str, expected_addr); + ASSERT_EQ(ret, 1, "inet_pton(AF_INET, expected_str)"); + addr_len = 4; + break; + default: + PRINT_FAIL("invalid address family: %d", family); + break; + } + + if (memcmp(addr, expected_addr, addr_len)) { + inet_ntop(family, addr, str, sizeof(str)); + PRINT_FAIL("expected %s actual %s ", expected_str, str); + } +} + +static void assert_src_ip(struct bpf_fib_lookup *params, const char *expected) +{ + assert_ip_address(params->family, params->ipv6_src, expected); +} + +static void assert_dst_ip(struct bpf_fib_lookup *params, const char *expected) +{ + assert_ip_address(params->family, params->ipv6_dst, expected); +} + +void test_fib_lookup(void) +{ + struct bpf_fib_lookup *fib_params; + struct nstoken *nstoken = NULL; + struct __sk_buff skb = { }; + struct fib_lookup *skel; + int prog_fd, err, ret, i; + + /* The test does not use the skb->data, so + * use pkt_v6 for both v6 and v4 test. + */ + LIBBPF_OPTS(bpf_test_run_opts, run_opts, + .data_in = &pkt_v6, + .data_size_in = sizeof(pkt_v6), + .ctx_in = &skb, + .ctx_size_in = sizeof(skb), + ); + + skel = fib_lookup__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel open_and_load")) + return; + prog_fd = bpf_program__fd(skel->progs.fib_lookup); + + SYS(fail, "ip netns add %s", NS_TEST); + + nstoken = open_netns(NS_TEST); + if (!ASSERT_OK_PTR(nstoken, "open_netns")) + goto fail; + + if (setup_netns()) + goto fail; + + skb.ifindex = if_nametoindex("veth1"); + if (!ASSERT_NEQ(skb.ifindex, 0, "if_nametoindex(veth1)")) + goto fail; + + fib_params = &skel->bss->fib_params; + + for (i = 0; i < ARRAY_SIZE(tests); i++) { + printf("Testing %s ", tests[i].desc); + + if (set_lookup_params(fib_params, &tests[i], skb.ifindex)) + continue; + + skel->bss->fib_lookup_ret = -1; + skel->bss->lookup_flags = tests[i].lookup_flags; + + err = bpf_prog_test_run_opts(prog_fd, &run_opts); + if (!ASSERT_OK(err, "bpf_prog_test_run_opts")) + continue; + + ASSERT_EQ(skel->bss->fib_lookup_ret, tests[i].expected_ret, + "fib_lookup_ret"); + + if (tests[i].expected_src) + assert_src_ip(fib_params, tests[i].expected_src); + + if (tests[i].expected_dst) + assert_dst_ip(fib_params, tests[i].expected_dst); + + ret = memcmp(tests[i].dmac, fib_params->dmac, sizeof(tests[i].dmac)); + if (!ASSERT_EQ(ret, 0, "dmac not match")) { + char expected[18], actual[18]; + + mac_str(expected, tests[i].dmac); + mac_str(actual, fib_params->dmac); + printf("dmac expected %s actual %s ", expected, actual); + } + + // ensure tbid is zero'd out after fib lookup. + if (tests[i].lookup_flags & BPF_FIB_LOOKUP_DIRECT) { + if (!ASSERT_EQ(skel->bss->fib_params.tbid, 0, + "expected fib_params.tbid to be zero")) + goto fail; + } + } + +fail: + if (nstoken) + close_netns(nstoken); + SYS_NOFAIL("ip netns del " NS_TEST); + fib_lookup__destroy(skel); +} |