tools/testing/selftests/bpf/test_progs.c

   1 /* Copyright (c) 2017 Facebook
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of version 2 of the GNU General Public
   5  * License as published by the Free Software Foundation.
   6  */
   7 #include <stdio.h>
   8 #include <unistd.h>
   9 #include <errno.h>
  10 #include <string.h>
  11 #include <assert.h>
  12 #include <stdlib.h>
  13
  14 #include <linux/types.h>
  15 typedef __u16 __sum16;
  16 #include <arpa/inet.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/if_packet.h>
  19 #include <linux/ip.h>
  20 #include <linux/ipv6.h>
  21 #include <linux/tcp.h>
  22
  23 #include <sys/wait.h>
  24 #include <sys/resource.h>
  25 #include <sys/types.h>
  26 #include <fcntl.h>
  27
  28 #include <linux/bpf.h>
  29 #include <linux/err.h>
  30 #include <bpf/bpf.h>
  31 #include <bpf/libbpf.h>
  32 #include "test_iptunnel_common.h"
  33 #include "bpf_util.h"
  34 #include "bpf_endian.h"
  35
  36 static int error_cnt, pass_cnt;
  37
  38 #define MAGIC_BYTES 123
  39
  40 /* ipv4 test vector */
  41 static struct {
  42         struct ethhdr eth;
  43         struct iphdr iph;
  44         struct tcphdr tcp;
  45 } __packed pkt_v4 = {
  46         .eth.h_proto = __bpf_constant_htons(ETH_P_IP),
  47         .iph.ihl = 5,
  48         .iph.protocol = 6,
  49         .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
  50         .tcp.urg_ptr = 123,
  51 };
  52
  53 /* ipv6 test vector */
  54 static struct {
  55         struct ethhdr eth;
  56         struct ipv6hdr iph;
  57         struct tcphdr tcp;
  58 } __packed pkt_v6 = {
  59         .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
  60         .iph.nexthdr = 6,
  61         .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
  62         .tcp.urg_ptr = 123,
  63 };
  64
  65 #define CHECK(condition, tag, format...) ({                             \
  66         int __ret = !!(condition);                                      \
  67         if (__ret) {                                                    \
  68                 error_cnt++;                                            \
  69                 printf("%s:FAIL:%s ", __func__, tag);                   \
  70                 printf(format);                                         \
  71         } else {                                                        \
  72                 pass_cnt++;                                             \
  73                 printf("%s:PASS:%s %d nsec\n", __func__, tag, duration);\
  74         }                                                               \
  75         __ret;                                                          \
  76 })
  77
  78 static int bpf_find_map(const char *test, struct bpf_object *obj,
  79                         const char *name)
  80 {
  81         struct bpf_map *map;
  82
  83         map = bpf_object__find_map_by_name(obj, name);
  84         if (!map) {
  85                 printf("%s:FAIL:map '%s' not found\n", test, name);
  86                 error_cnt++;
  87                 return -1;
  88         }
  89         return bpf_map__fd(map);
  90 }
  91
  92 static void test_pkt_access(void)
  93 {
  94         const char *file = "./test_pkt_access.o";
  95         struct bpf_object *obj;
  96         __u32 duration, retval;
  97         int err, prog_fd;
  98
  99         err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
 100         if (err) {
 101                 error_cnt++;
 102                 return;
 103         }
 104
 105         err = bpf_prog_test_run(prog_fd, 100000, &pkt_v4, sizeof(pkt_v4),
 106                                 NULL, NULL, &retval, &duration);
 107         CHECK(err || errno || retval, "ipv4",
 108               "err %d errno %d retval %d duration %d\n",
 109               err, errno, retval, duration);
 110
 111         err = bpf_prog_test_run(prog_fd, 100000, &pkt_v6, sizeof(pkt_v6),
 112                                 NULL, NULL, &retval, &duration);
 113         CHECK(err || errno || retval, "ipv6",
 114               "err %d errno %d retval %d duration %d\n",
 115               err, errno, retval, duration);
 116         bpf_object__close(obj);
 117 }
 118
 119 static void test_xdp(void)
 120 {
 121         struct vip key4 = {.protocol = 6, .family = AF_INET};
 122         struct vip key6 = {.protocol = 6, .family = AF_INET6};
 123         struct iptnl_info value4 = {.family = AF_INET};
 124         struct iptnl_info value6 = {.family = AF_INET6};
 125         const char *file = "./test_xdp.o";
 126         struct bpf_object *obj;
 127         char buf[128];
 128         struct ipv6hdr *iph6 = (void *)buf + sizeof(struct ethhdr);
 129         struct iphdr *iph = (void *)buf + sizeof(struct ethhdr);
 130         __u32 duration, retval, size;
 131         int err, prog_fd, map_fd;
 132
 133         err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
 134         if (err) {
 135                 error_cnt++;
 136                 return;
 137         }
 138
 139         map_fd = bpf_find_map(__func__, obj, "vip2tnl");
 140         if (map_fd < 0)
 141                 goto out;
 142         bpf_map_update_elem(map_fd, &key4, &value4, 0);
 143         bpf_map_update_elem(map_fd, &key6, &value6, 0);
 144
 145         err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
 146                                 buf, &size, &retval, &duration);
 147
 148         CHECK(err || errno || retval != XDP_TX || size != 74 ||
 149               iph->protocol != IPPROTO_IPIP, "ipv4",
 150               "err %d errno %d retval %d size %d\n",
 151               err, errno, retval, size);
 152
 153         err = bpf_prog_test_run(prog_fd, 1, &pkt_v6, sizeof(pkt_v6),
 154                                 buf, &size, &retval, &duration);
 155         CHECK(err || errno || retval != XDP_TX || size != 114 ||
 156               iph6->nexthdr != IPPROTO_IPV6, "ipv6",
 157               "err %d errno %d retval %d size %d\n",
 158               err, errno, retval, size);
 159 out:
 160         bpf_object__close(obj);
 161 }
 162
 163 #define MAGIC_VAL 0x1234
 164 #define NUM_ITER 100000
 165 #define VIP_NUM 5
 166
 167 static void test_l4lb(void)
 168 {
 169         unsigned int nr_cpus = bpf_num_possible_cpus();
 170         const char *file = "./test_l4lb.o";
 171         struct vip key = {.protocol = 6};
 172         struct vip_meta {
 173                 __u32 flags;
 174                 __u32 vip_num;
 175         } value = {.vip_num = VIP_NUM};
 176         __u32 stats_key = VIP_NUM;
 177         struct vip_stats {
 178                 __u64 bytes;
 179                 __u64 pkts;
 180         } stats[nr_cpus];
 181         struct real_definition {
 182                 union {
 183                         __be32 dst;
 184                         __be32 dstv6[4];
 185                 };
 186                 __u8 flags;
 187         } real_def = {.dst = MAGIC_VAL};
 188         __u32 ch_key = 11, real_num = 3;
 189         __u32 duration, retval, size;
 190         int err, i, prog_fd, map_fd;
 191         __u64 bytes = 0, pkts = 0;
 192         struct bpf_object *obj;
 193         char buf[128];
 194         u32 *magic = (u32 *)buf;
 195
 196         err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
 197         if (err) {
 198                 error_cnt++;
 199                 return;
 200         }
 201
 202         map_fd = bpf_find_map(__func__, obj, "vip_map");
 203         if (map_fd < 0)
 204                 goto out;
 205         bpf_map_update_elem(map_fd, &key, &value, 0);
 206
 207         map_fd = bpf_find_map(__func__, obj, "ch_rings");
 208         if (map_fd < 0)
 209                 goto out;
 210         bpf_map_update_elem(map_fd, &ch_key, &real_num, 0);
 211
 212         map_fd = bpf_find_map(__func__, obj, "reals");
 213         if (map_fd < 0)
 214                 goto out;
 215         bpf_map_update_elem(map_fd, &real_num, &real_def, 0);
 216
 217         err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v4, sizeof(pkt_v4),
 218                                 buf, &size, &retval, &duration);
 219         CHECK(err || errno || retval != 7/*TC_ACT_REDIRECT*/ || size != 54 ||
 220               *magic != MAGIC_VAL, "ipv4",
 221               "err %d errno %d retval %d size %d magic %x\n",
 222               err, errno, retval, size, *magic);
 223
 224         err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v6, sizeof(pkt_v6),
 225                                 buf, &size, &retval, &duration);
 226         CHECK(err || errno || retval != 7/*TC_ACT_REDIRECT*/ || size != 74 ||
 227               *magic != MAGIC_VAL, "ipv6",
 228               "err %d errno %d retval %d size %d magic %x\n",
 229               err, errno, retval, size, *magic);
 230
 231         map_fd = bpf_find_map(__func__, obj, "stats");
 232         if (map_fd < 0)
 233                 goto out;
 234         bpf_map_lookup_elem(map_fd, &stats_key, stats);
 235         for (i = 0; i < nr_cpus; i++) {
 236                 bytes += stats[i].bytes;
 237                 pkts += stats[i].pkts;
 238         }
 239         if (bytes != MAGIC_BYTES * NUM_ITER * 2 || pkts != NUM_ITER * 2) {
 240                 error_cnt++;
 241                 printf("test_l4lb:FAIL:stats %lld %lld\n", bytes, pkts);
 242         }
 243 out:
 244         bpf_object__close(obj);
 245 }
 246
 247 static void test_tcp_estats(void)
 248 {
 249         const char *file = "./test_tcp_estats.o";
 250         int err, prog_fd;
 251         struct bpf_object *obj;
 252         __u32 duration = 0;
 253
 254         err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
 255         CHECK(err, "", "err %d errno %d\n", err, errno);
 256         if (err) {
 257                 error_cnt++;
 258                 return;
 259         }
 260
 261         bpf_object__close(obj);
 262 }
 263
 264 static inline __u64 ptr_to_u64(const void *ptr)
 265 {
 266         return (__u64) (unsigned long) ptr;
 267 }
 268
 269 static void test_bpf_obj_id(void)
 270 {
 271         const __u64 array_magic_value = 0xfaceb00c;
 272         const __u32 array_key = 0;
 273         const int nr_iters = 2;
 274         const char *file = "./test_obj_id.o";
 275         const char *jit_sysctl = "/proc/sys/net/core/bpf_jit_enable";
 276
 277         struct bpf_object *objs[nr_iters];
 278         int prog_fds[nr_iters], map_fds[nr_iters];
 279         /* +1 to test for the info_len returned by kernel */
 280         struct bpf_prog_info prog_infos[nr_iters + 1];
 281         struct bpf_map_info map_infos[nr_iters + 1];
 282         char jited_insns[128], xlated_insns[128], zeros[128];
 283         __u32 i, next_id, info_len, nr_id_found, duration = 0;
 284         int sysctl_fd, jit_enabled = 0, err = 0;
 285         __u64 array_value;
 286
 287         sysctl_fd = open(jit_sysctl, 0, O_RDONLY);
 288         if (sysctl_fd != -1) {
 289                 char tmpc;
 290
 291                 if (read(sysctl_fd, &tmpc, sizeof(tmpc)) == 1)
 292                         jit_enabled = (tmpc != '0');
 293                 close(sysctl_fd);
 294         }
 295
 296         err = bpf_prog_get_fd_by_id(0);
 297         CHECK(err >= 0 || errno != ENOENT,
 298               "get-fd-by-notexist-prog-id", "err %d errno %d\n", err, errno);
 299
 300         err = bpf_map_get_fd_by_id(0);
 301         CHECK(err >= 0 || errno != ENOENT,
 302               "get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno);
 303
 304         for (i = 0; i < nr_iters; i++)
 305                 objs[i] = NULL;
 306
 307         /* Check bpf_obj_get_info_by_fd() */
 308         bzero(zeros, sizeof(zeros));
 309         for (i = 0; i < nr_iters; i++) {
 310                 err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER,
 311                                     &objs[i], &prog_fds[i]);
 312                 /* test_obj_id.o is a dumb prog. It should never fail
 313                  * to load.
 314                  */
 315                 if (err)
 316                         error_cnt++;
 317                 assert(!err);
 318
 319                 /* Check getting prog info */
 320                 info_len = sizeof(struct bpf_prog_info) * 2;
 321                 bzero(&prog_infos[i], info_len);
 322                 bzero(jited_insns, sizeof(jited_insns));
 323                 bzero(xlated_insns, sizeof(xlated_insns));
 324                 prog_infos[i].jited_prog_insns = ptr_to_u64(jited_insns);
 325                 prog_infos[i].jited_prog_len = sizeof(jited_insns);
 326                 prog_infos[i].xlated_prog_insns = ptr_to_u64(xlated_insns);
 327                 prog_infos[i].xlated_prog_len = sizeof(xlated_insns);
 328                 err = bpf_obj_get_info_by_fd(prog_fds[i], &prog_infos[i],
 329                                              &info_len);
 330                 if (CHECK(err ||
 331                           prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER ||
 332                           info_len != sizeof(struct bpf_prog_info) ||
 333                           (jit_enabled && !prog_infos[i].jited_prog_len) ||
 334                           (jit_enabled &&
 335                            !memcmp(jited_insns, zeros, sizeof(zeros))) ||
 336                           !prog_infos[i].xlated_prog_len ||
 337                           !memcmp(xlated_insns, zeros, sizeof(zeros)),
 338                           "get-prog-info(fd)",
 339                           "err %d errno %d i %d type %d(%d) info_len %u(%lu) jit_enabled %d jited_prog_len %u xlated_prog_len %u jited_prog %d xlated_prog %d\n",
 340                           err, errno, i,
 341                           prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
 342                           info_len, sizeof(struct bpf_prog_info),
 343                           jit_enabled,
 344                           prog_infos[i].jited_prog_len,
 345                           prog_infos[i].xlated_prog_len,
 346                           !!memcmp(jited_insns, zeros, sizeof(zeros)),
 347                           !!memcmp(xlated_insns, zeros, sizeof(zeros))))
 348                         goto done;
 349
 350                 map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id");
 351                 assert(map_fds[i] >= 0);
 352                 err = bpf_map_update_elem(map_fds[i], &array_key,
 353                                           &array_magic_value, 0);
 354                 assert(!err);
 355
 356                 /* Check getting map info */
 357                 info_len = sizeof(struct bpf_map_info) * 2;
 358                 bzero(&map_infos[i], info_len);
 359                 err = bpf_obj_get_info_by_fd(map_fds[i], &map_infos[i],
 360                                              &info_len);
 361                 if (CHECK(err ||
 362                           map_infos[i].type != BPF_MAP_TYPE_ARRAY ||
 363                           map_infos[i].key_size != sizeof(__u32) ||
 364                           map_infos[i].value_size != sizeof(__u64) ||
 365                           map_infos[i].max_entries != 1 ||
 366                           map_infos[i].map_flags != 0 ||
 367                           info_len != sizeof(struct bpf_map_info),
 368                           "get-map-info(fd)",
 369                           "err %d errno %d type %d(%d) info_len %u(%lu) key_size %u value_size %u max_entries %u map_flags %X\n",
 370                           err, errno,
 371                           map_infos[i].type, BPF_MAP_TYPE_ARRAY,
 372                           info_len, sizeof(struct bpf_map_info),
 373                           map_infos[i].key_size,
 374                           map_infos[i].value_size,
 375                           map_infos[i].max_entries,
 376                           map_infos[i].map_flags))
 377                         goto done;
 378         }
 379
 380         /* Check bpf_prog_get_next_id() */
 381         nr_id_found = 0;
 382         next_id = 0;
 383         while (!bpf_prog_get_next_id(next_id, &next_id)) {
 384                 struct bpf_prog_info prog_info = {};
 385                 int prog_fd;
 386
 387                 info_len = sizeof(prog_info);
 388
 389                 prog_fd = bpf_prog_get_fd_by_id(next_id);
 390                 if (prog_fd < 0 && errno == ENOENT)
 391                         /* The bpf_prog is in the dead row */
 392                         continue;
 393                 if (CHECK(prog_fd < 0, "get-prog-fd(next_id)",
 394                           "prog_fd %d next_id %d errno %d\n",
 395                           prog_fd, next_id, errno))
 396                         break;
 397
 398                 for (i = 0; i < nr_iters; i++)
 399                         if (prog_infos[i].id == next_id)
 400                                 break;
 401
 402                 if (i == nr_iters)
 403                         continue;
 404
 405                 nr_id_found++;
 406
 407                 err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
 408                 prog_infos[i].jited_prog_insns = 0;
 409                 prog_infos[i].xlated_prog_insns = 0;
 410                 CHECK(err || info_len != sizeof(struct bpf_prog_info) ||
 411                       memcmp(&prog_info, &prog_infos[i], info_len),
 412                       "get-prog-info(next_id->fd)",
 413                       "err %d errno %d info_len %u(%lu) memcmp %d\n",
 414                       err, errno, info_len, sizeof(struct bpf_prog_info),
 415                       memcmp(&prog_info, &prog_infos[i], info_len));
 416
 417                 close(prog_fd);
 418         }
 419         CHECK(nr_id_found != nr_iters,
 420               "check total prog id found by get_next_id",
 421               "nr_id_found %u(%u)\n",
 422               nr_id_found, nr_iters);
 423
 424         /* Check bpf_map_get_next_id() */
 425         nr_id_found = 0;
 426         next_id = 0;
 427         while (!bpf_map_get_next_id(next_id, &next_id)) {
 428                 struct bpf_map_info map_info = {};
 429                 int map_fd;
 430
 431                 info_len = sizeof(map_info);
 432
 433                 map_fd = bpf_map_get_fd_by_id(next_id);
 434                 if (map_fd < 0 && errno == ENOENT)
 435                         /* The bpf_map is in the dead row */
 436                         continue;
 437                 if (CHECK(map_fd < 0, "get-map-fd(next_id)",
 438                           "map_fd %d next_id %u errno %d\n",
 439                           map_fd, next_id, errno))
 440                         break;
 441
 442                 for (i = 0; i < nr_iters; i++)
 443                         if (map_infos[i].id == next_id)
 444                                 break;
 445
 446                 if (i == nr_iters)
 447                         continue;
 448
 449                 nr_id_found++;
 450
 451                 err = bpf_map_lookup_elem(map_fd, &array_key, &array_value);
 452                 assert(!err);
 453
 454                 err = bpf_obj_get_info_by_fd(map_fd, &map_info, &info_len);
 455                 CHECK(err || info_len != sizeof(struct bpf_map_info) ||
 456                       memcmp(&map_info, &map_infos[i], info_len) ||
 457                       array_value != array_magic_value,
 458                       "check get-map-info(next_id->fd)",
 459                       "err %d errno %d info_len %u(%lu) memcmp %d array_value %llu(%llu)\n",
 460                       err, errno, info_len, sizeof(struct bpf_map_info),
 461                       memcmp(&map_info, &map_infos[i], info_len),
 462                       array_value, array_magic_value);
 463
 464                 close(map_fd);
 465         }
 466         CHECK(nr_id_found != nr_iters,
 467               "check total map id found by get_next_id",
 468               "nr_id_found %u(%u)\n",
 469               nr_id_found, nr_iters);
 470
 471 done:
 472         for (i = 0; i < nr_iters; i++)
 473                 bpf_object__close(objs[i]);
 474 }
 475
 476 static void test_pkt_md_access(void)
 477 {
 478         const char *file = "./test_pkt_md_access.o";
 479         struct bpf_object *obj;
 480         __u32 duration, retval;
 481         int err, prog_fd;
 482
 483         err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
 484         if (err) {
 485                 error_cnt++;
 486                 return;
 487         }
 488
 489         err = bpf_prog_test_run(prog_fd, 10, &pkt_v4, sizeof(pkt_v4),
 490                                 NULL, NULL, &retval, &duration);
 491         CHECK(err || retval, "",
 492               "err %d errno %d retval %d duration %d\n",
 493               err, errno, retval, duration);
 494
 495         bpf_object__close(obj);
 496 }
 497
 498 int main(void)
 499 {
 500         struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
 501
 502         setrlimit(RLIMIT_MEMLOCK, &rinf);
 503
 504         test_pkt_access();
 505         test_xdp();
 506         test_l4lb();
 507         test_tcp_estats();
 508         test_bpf_obj_id();
 509         test_pkt_md_access();
 510
 511         printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
 512         return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
 513 }