1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2 3 /* 4 * Topology: 5 * --------- 6 * NS0 namespace | NS1 namespace | NS2 namespace 7 * | | 8 * +---------------+ | +---------------+ | 9 * | ipsec0 |---------| ipsec0 | | 10 * | 192.168.1.100 | | | 192.168.1.200 | | 11 * | if_id: bpf | | +---------------+ | 12 * +---------------+ | | 13 * | | | +---------------+ 14 * | | | | ipsec0 | 15 * \------------------------------------------| 192.168.1.200 | 16 * | | +---------------+ 17 * | | 18 * | | (overlay network) 19 * ------------------------------------------------------ 20 * | | (underlay network) 21 * +--------------+ | +--------------+ | 22 * | veth01 |----------| veth10 | | 23 * | 172.16.1.100 | | | 172.16.1.200 | | 24 * ---------------+ | +--------------+ | 25 * | | 26 * +--------------+ | | +--------------+ 27 * | veth02 |-----------------------------------| veth20 | 28 * | 172.16.2.100 | | | | 172.16.2.200 | 29 * +--------------+ | | +--------------+ 30 * 31 * 32 * Test Packet flow 33 * ----------- 34 * The tests perform 'ping 192.168.1.200' from the NS0 namespace: 35 * 1) request is routed to NS0 ipsec0 36 * 2) NS0 ipsec0 tc egress BPF program is triggered and sets the if_id based 37 * on the requested value. This makes the ipsec0 device in external mode 38 * select the destination tunnel 39 * 3) ping reaches the other namespace (NS1 or NS2 based on which if_id was 40 * used) and response is sent 41 * 4) response is received on NS0 ipsec0, tc ingress program is triggered and 42 * records the response if_id 43 * 5) requested if_id is compared with received if_id 44 */ 45 46 #include <net/if.h> 47 #include <linux/rtnetlink.h> 48 #include <linux/if_link.h> 49 50 #include "test_progs.h" 51 #include "network_helpers.h" 52 #include "xfrm_info.skel.h" 53 54 #define NS0 "xfrm_test_ns0" 55 #define NS1 "xfrm_test_ns1" 56 #define NS2 "xfrm_test_ns2" 57 58 #define IF_ID_0_TO_1 1 59 #define IF_ID_0_TO_2 2 60 #define IF_ID_1 3 61 #define IF_ID_2 4 62 63 #define IP4_ADDR_VETH01 "172.16.1.100" 64 #define IP4_ADDR_VETH10 "172.16.1.200" 65 #define IP4_ADDR_VETH02 "172.16.2.100" 66 #define IP4_ADDR_VETH20 "172.16.2.200" 67 68 #define ESP_DUMMY_PARAMS \ 69 "proto esp aead 'rfc4106(gcm(aes))' " \ 70 "0xe4d8f4b4da1df18a3510b3781496daa82488b713 128 mode tunnel " 71 72 static int attach_tc_prog(struct bpf_tc_hook *hook, int igr_fd, int egr_fd) 73 { 74 LIBBPF_OPTS(bpf_tc_opts, opts1, .handle = 1, .priority = 1, 75 .prog_fd = igr_fd); 76 LIBBPF_OPTS(bpf_tc_opts, opts2, .handle = 1, .priority = 1, 77 .prog_fd = egr_fd); 78 int ret; 79 80 ret = bpf_tc_hook_create(hook); 81 if (!ASSERT_OK(ret, "create tc hook")) 82 return ret; 83 84 if (igr_fd >= 0) { 85 hook->attach_point = BPF_TC_INGRESS; 86 ret = bpf_tc_attach(hook, &opts1); 87 if (!ASSERT_OK(ret, "bpf_tc_attach")) { 88 bpf_tc_hook_destroy(hook); 89 return ret; 90 } 91 } 92 93 if (egr_fd >= 0) { 94 hook->attach_point = BPF_TC_EGRESS; 95 ret = bpf_tc_attach(hook, &opts2); 96 if (!ASSERT_OK(ret, "bpf_tc_attach")) { 97 bpf_tc_hook_destroy(hook); 98 return ret; 99 } 100 } 101 102 return 0; 103 } 104 105 static void cleanup(void) 106 { 107 SYS_NOFAIL("test -f /var/run/netns/" NS0 " && ip netns delete " NS0); 108 SYS_NOFAIL("test -f /var/run/netns/" NS1 " && ip netns delete " NS1); 109 SYS_NOFAIL("test -f /var/run/netns/" NS2 " && ip netns delete " NS2); 110 } 111 112 static int config_underlay(void) 113 { 114 SYS(fail, "ip netns add " NS0); 115 SYS(fail, "ip netns add " NS1); 116 SYS(fail, "ip netns add " NS2); 117 118 /* NS0 <-> NS1 [veth01 <-> veth10] */ 119 SYS(fail, "ip link add veth01 netns " NS0 " type veth peer name veth10 netns " NS1); 120 SYS(fail, "ip -net " NS0 " addr add " IP4_ADDR_VETH01 "/24 dev veth01"); 121 SYS(fail, "ip -net " NS0 " link set dev veth01 up"); 122 SYS(fail, "ip -net " NS1 " addr add " IP4_ADDR_VETH10 "/24 dev veth10"); 123 SYS(fail, "ip -net " NS1 " link set dev veth10 up"); 124 125 /* NS0 <-> NS2 [veth02 <-> veth20] */ 126 SYS(fail, "ip link add veth02 netns " NS0 " type veth peer name veth20 netns " NS2); 127 SYS(fail, "ip -net " NS0 " addr add " IP4_ADDR_VETH02 "/24 dev veth02"); 128 SYS(fail, "ip -net " NS0 " link set dev veth02 up"); 129 SYS(fail, "ip -net " NS2 " addr add " IP4_ADDR_VETH20 "/24 dev veth20"); 130 SYS(fail, "ip -net " NS2 " link set dev veth20 up"); 131 132 return 0; 133 fail: 134 return -1; 135 } 136 137 static int setup_xfrm_tunnel_ns(const char *ns, const char *ipv4_local, 138 const char *ipv4_remote, int if_id) 139 { 140 /* State: local -> remote */ 141 SYS(fail, "ip -net %s xfrm state add src %s dst %s spi 1 " 142 ESP_DUMMY_PARAMS "if_id %d", ns, ipv4_local, ipv4_remote, if_id); 143 144 /* State: local <- remote */ 145 SYS(fail, "ip -net %s xfrm state add src %s dst %s spi 1 " 146 ESP_DUMMY_PARAMS "if_id %d", ns, ipv4_remote, ipv4_local, if_id); 147 148 /* Policy: local -> remote */ 149 SYS(fail, "ip -net %s xfrm policy add dir out src 0.0.0.0/0 dst 0.0.0.0/0 " 150 "if_id %d tmpl src %s dst %s proto esp mode tunnel if_id %d", ns, 151 if_id, ipv4_local, ipv4_remote, if_id); 152 153 /* Policy: local <- remote */ 154 SYS(fail, "ip -net %s xfrm policy add dir in src 0.0.0.0/0 dst 0.0.0.0/0 " 155 "if_id %d tmpl src %s dst %s proto esp mode tunnel if_id %d", ns, 156 if_id, ipv4_remote, ipv4_local, if_id); 157 158 return 0; 159 fail: 160 return -1; 161 } 162 163 static int setup_xfrm_tunnel(const char *ns_a, const char *ns_b, 164 const char *ipv4_a, const char *ipv4_b, 165 int if_id_a, int if_id_b) 166 { 167 return setup_xfrm_tunnel_ns(ns_a, ipv4_a, ipv4_b, if_id_a) || 168 setup_xfrm_tunnel_ns(ns_b, ipv4_b, ipv4_a, if_id_b); 169 } 170 171 static struct rtattr *rtattr_add(struct nlmsghdr *nh, unsigned short type, 172 unsigned short len) 173 { 174 struct rtattr *rta = 175 (struct rtattr *)((uint8_t *)nh + RTA_ALIGN(nh->nlmsg_len)); 176 rta->rta_type = type; 177 rta->rta_len = RTA_LENGTH(len); 178 nh->nlmsg_len = RTA_ALIGN(nh->nlmsg_len) + RTA_ALIGN(rta->rta_len); 179 return rta; 180 } 181 182 static struct rtattr *rtattr_add_str(struct nlmsghdr *nh, unsigned short type, 183 const char *s) 184 { 185 struct rtattr *rta = rtattr_add(nh, type, strlen(s)); 186 187 memcpy(RTA_DATA(rta), s, strlen(s)); 188 return rta; 189 } 190 191 static struct rtattr *rtattr_begin(struct nlmsghdr *nh, unsigned short type) 192 { 193 return rtattr_add(nh, type, 0); 194 } 195 196 static void rtattr_end(struct nlmsghdr *nh, struct rtattr *attr) 197 { 198 uint8_t *end = (uint8_t *)nh + nh->nlmsg_len; 199 200 attr->rta_len = end - (uint8_t *)attr; 201 } 202 203 static int setup_xfrmi_external_dev(const char *ns) 204 { 205 struct { 206 struct nlmsghdr nh; 207 struct ifinfomsg info; 208 unsigned char data[128]; 209 } req; 210 struct rtattr *link_info, *info_data; 211 struct nstoken *nstoken; 212 int ret = -1, sock = -1; 213 struct nlmsghdr *nh; 214 215 memset(&req, 0, sizeof(req)); 216 nh = &req.nh; 217 nh->nlmsg_len = NLMSG_LENGTH(sizeof(req.info)); 218 nh->nlmsg_type = RTM_NEWLINK; 219 nh->nlmsg_flags |= NLM_F_CREATE | NLM_F_REQUEST; 220 221 rtattr_add_str(nh, IFLA_IFNAME, "ipsec0"); 222 link_info = rtattr_begin(nh, IFLA_LINKINFO); 223 rtattr_add_str(nh, IFLA_INFO_KIND, "xfrm"); 224 info_data = rtattr_begin(nh, IFLA_INFO_DATA); 225 rtattr_add(nh, IFLA_XFRM_COLLECT_METADATA, 0); 226 rtattr_end(nh, info_data); 227 rtattr_end(nh, link_info); 228 229 nstoken = open_netns(ns); 230 if (!ASSERT_OK_PTR(nstoken, "setns")) 231 goto done; 232 233 sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE); 234 if (!ASSERT_GE(sock, 0, "netlink socket")) 235 goto done; 236 ret = send(sock, nh, nh->nlmsg_len, 0); 237 if (!ASSERT_EQ(ret, nh->nlmsg_len, "netlink send length")) 238 goto done; 239 240 ret = 0; 241 done: 242 if (sock != -1) 243 close(sock); 244 if (nstoken) 245 close_netns(nstoken); 246 return ret; 247 } 248 249 static int config_overlay(void) 250 { 251 if (setup_xfrm_tunnel(NS0, NS1, IP4_ADDR_VETH01, IP4_ADDR_VETH10, 252 IF_ID_0_TO_1, IF_ID_1)) 253 goto fail; 254 if (setup_xfrm_tunnel(NS0, NS2, IP4_ADDR_VETH02, IP4_ADDR_VETH20, 255 IF_ID_0_TO_2, IF_ID_2)) 256 goto fail; 257 258 /* Older iproute2 doesn't support this option */ 259 if (!ASSERT_OK(setup_xfrmi_external_dev(NS0), "xfrmi")) 260 goto fail; 261 262 SYS(fail, "ip -net " NS0 " addr add 192.168.1.100/24 dev ipsec0"); 263 SYS(fail, "ip -net " NS0 " link set dev ipsec0 up"); 264 265 SYS(fail, "ip -net " NS1 " link add ipsec0 type xfrm if_id %d", IF_ID_1); 266 SYS(fail, "ip -net " NS1 " addr add 192.168.1.200/24 dev ipsec0"); 267 SYS(fail, "ip -net " NS1 " link set dev ipsec0 up"); 268 269 SYS(fail, "ip -net " NS2 " link add ipsec0 type xfrm if_id %d", IF_ID_2); 270 SYS(fail, "ip -net " NS2 " addr add 192.168.1.200/24 dev ipsec0"); 271 SYS(fail, "ip -net " NS2 " link set dev ipsec0 up"); 272 273 return 0; 274 fail: 275 return -1; 276 } 277 278 static int test_xfrm_ping(struct xfrm_info *skel, u32 if_id) 279 { 280 skel->bss->req_if_id = if_id; 281 282 SYS(fail, "ping -i 0.01 -c 3 -w 10 -q 192.168.1.200 > /dev/null"); 283 284 if (!ASSERT_EQ(skel->bss->resp_if_id, if_id, "if_id")) 285 goto fail; 286 287 return 0; 288 fail: 289 return -1; 290 } 291 292 static void _test_xfrm_info(void) 293 { 294 LIBBPF_OPTS(bpf_tc_hook, tc_hook, .attach_point = BPF_TC_INGRESS); 295 int get_xfrm_info_prog_fd, set_xfrm_info_prog_fd; 296 struct nstoken *nstoken = NULL; 297 struct xfrm_info *skel; 298 int ifindex; 299 300 /* load and attach bpf progs to ipsec dev tc hook point */ 301 skel = xfrm_info__open_and_load(); 302 if (!ASSERT_OK_PTR(skel, "xfrm_info__open_and_load")) 303 goto done; 304 nstoken = open_netns(NS0); 305 if (!ASSERT_OK_PTR(nstoken, "setns " NS0)) 306 goto done; 307 ifindex = if_nametoindex("ipsec0"); 308 if (!ASSERT_NEQ(ifindex, 0, "ipsec0 ifindex")) 309 goto done; 310 tc_hook.ifindex = ifindex; 311 set_xfrm_info_prog_fd = bpf_program__fd(skel->progs.set_xfrm_info); 312 get_xfrm_info_prog_fd = bpf_program__fd(skel->progs.get_xfrm_info); 313 if (!ASSERT_GE(set_xfrm_info_prog_fd, 0, "bpf_program__fd")) 314 goto done; 315 if (!ASSERT_GE(get_xfrm_info_prog_fd, 0, "bpf_program__fd")) 316 goto done; 317 if (attach_tc_prog(&tc_hook, get_xfrm_info_prog_fd, 318 set_xfrm_info_prog_fd)) 319 goto done; 320 321 /* perform test */ 322 if (!ASSERT_EQ(test_xfrm_ping(skel, IF_ID_0_TO_1), 0, "ping " NS1)) 323 goto done; 324 if (!ASSERT_EQ(test_xfrm_ping(skel, IF_ID_0_TO_2), 0, "ping " NS2)) 325 goto done; 326 327 done: 328 if (nstoken) 329 close_netns(nstoken); 330 xfrm_info__destroy(skel); 331 } 332 333 void test_xfrm_info(void) 334 { 335 cleanup(); 336 337 if (!ASSERT_OK(config_underlay(), "config_underlay")) 338 goto done; 339 if (!ASSERT_OK(config_overlay(), "config_overlay")) 340 goto done; 341 342 if (test__start_subtest("xfrm_info")) 343 _test_xfrm_info(); 344 345 done: 346 cleanup(); 347 } 348