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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 | // 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_NUD_FAILED_ADDR "face::1" #define IPV6_NUD_STALE_ADDR "face::2" #define IPV4_IFACE_ADDR "10.0.0.254" #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 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; int lookup_flags; __u32 tbid; __u8 dmac[6]; }; 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, }, }; static int ifindex; 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 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; return 0; fail: return -1; } static int set_lookup_params(struct bpf_fib_lookup *params, const struct fib_lookup_test *test) { int ret; memset(params, 0, sizeof(*params)); params->l4_protocol = IPPROTO_TCP; params->ifindex = ifindex; params->tbid = test->tbid; if (inet_pton(AF_INET6, test->daddr, params->ipv6_dst) == 1) { params->family = AF_INET6; 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; 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]); } 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; ifindex = if_nametoindex("veth1"); skb.ifindex = ifindex; 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])) 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"); 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 " &> /dev/null"); fib_lookup__destroy(skel); } |