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_htons(ETH_P_IP),
  47         .iph.ihl = 5,
  48         .iph.protocol = 6,
  49         .iph.tot_len = bpf_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_htons(ETH_P_IPV6),
  60         .iph.nexthdr = 6,
  61         .iph.payload_len = bpf_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_prog_load(const char *file, enum bpf_prog_type type,
  79                          struct bpf_object **pobj, int *prog_fd)
  80 {
  81         struct bpf_program *prog;
  82         struct bpf_object *obj;
  83         int err;
  84
  85         obj = bpf_object__open(file);
  86         if (IS_ERR(obj)) {
  87                 error_cnt++;
  88                 return -ENOENT;
  89         }
  90
  91         prog = bpf_program__next(NULL, obj);
  92         if (!prog) {
  93                 bpf_object__close(obj);
  94                 error_cnt++;
  95                 return -ENOENT;
  96         }
  97
  98         bpf_program__set_type(prog, type);
  99         err = bpf_object__load(obj);
 100         if (err) {
 101                 bpf_object__close(obj);
 102                 error_cnt++;
 103                 return -EINVAL;
 104         }
 105
 106         *pobj = obj;
 107         *prog_fd = bpf_program__fd(prog);
 108         return 0;
 109 }
 110
 111 static int bpf_find_map(const char *test, struct bpf_object *obj,
 112                         const char *name)
 113 {
 114         struct bpf_map *map;
 115
 116         map = bpf_object__find_map_by_name(obj, name);
 117         if (!map) {
 118                 printf("%s:FAIL:map '%s' not found\n", test, name);
 119                 error_cnt++;
 120                 return -1;
 121         }
 122         return bpf_map__fd(map);
 123 }
 124
 125 static void test_pkt_access(void)
 126 {
 127         const char *file = "./test_pkt_access.o";
 128         struct bpf_object *obj;
 129         __u32 duration, retval;
 130         int err, prog_fd;
 131
 132         err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
 133         if (err)
 134                 return;
 135
 136         err = bpf_prog_test_run(prog_fd, 100000, &pkt_v4, sizeof(pkt_v4),
 137                                 NULL, NULL, &retval, &duration);
 138         CHECK(err || errno || retval, "ipv4",
 139               "err %d errno %d retval %d duration %d\n",
 140               err, errno, retval, duration);
 141
 142         err = bpf_prog_test_run(prog_fd, 100000, &pkt_v6, sizeof(pkt_v6),
 143                                 NULL, NULL, &retval, &duration);
 144         CHECK(err || errno || retval, "ipv6",
 145               "err %d errno %d retval %d duration %d\n",
 146               err, errno, retval, duration);
 147         bpf_object__close(obj);
 148 }
 149
 150 static void test_xdp(void)
 151 {
 152         struct vip key4 = {.protocol = 6, .family = AF_INET};
 153         struct vip key6 = {.protocol = 6, .family = AF_INET6};
 154         struct iptnl_info value4 = {.family = AF_INET};
 155         struct iptnl_info value6 = {.family = AF_INET6};
 156         const char *file = "./test_xdp.o";
 157         struct bpf_object *obj;
 158         char buf[128];
 159         struct ipv6hdr *iph6 = (void *)buf + sizeof(struct ethhdr);
 160         struct iphdr *iph = (void *)buf + sizeof(struct ethhdr);
 161         __u32 duration, retval, size;
 162         int err, prog_fd, map_fd;
 163
 164         err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
 165         if (err)
 166                 return;
 167
 168         map_fd = bpf_find_map(__func__, obj, "vip2tnl");
 169         if (map_fd < 0)
 170                 goto out;
 171         bpf_map_update_elem(map_fd, &key4, &value4, 0);
 172         bpf_map_update_elem(map_fd, &key6, &value6, 0);
 173
 174         err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
 175                                 buf, &size, &retval, &duration);
 176
 177         CHECK(err || errno || retval != XDP_TX || size != 74 ||
 178               iph->protocol != IPPROTO_IPIP, "ipv4",
 179               "err %d errno %d retval %d size %d\n",
 180               err, errno, retval, size);
 181
 182         err = bpf_prog_test_run(prog_fd, 1, &pkt_v6, sizeof(pkt_v6),
 183                                 buf, &size, &retval, &duration);
 184         CHECK(err || errno || retval != XDP_TX || size != 114 ||
 185               iph6->nexthdr != IPPROTO_IPV6, "ipv6",
 186               "err %d errno %d retval %d size %d\n",
 187               err, errno, retval, size);
 188 out:
 189         bpf_object__close(obj);
 190 }
 191
 192 #define MAGIC_VAL 0x1234
 193 #define NUM_ITER 100000
 194 #define VIP_NUM 5
 195
 196 static void test_l4lb(void)
 197 {
 198         unsigned int nr_cpus = bpf_num_possible_cpus();
 199         const char *file = "./test_l4lb.o";
 200         struct vip key = {.protocol = 6};
 201         struct vip_meta {
 202                 __u32 flags;
 203                 __u32 vip_num;
 204         } value = {.vip_num = VIP_NUM};
 205         __u32 stats_key = VIP_NUM;
 206         struct vip_stats {
 207                 __u64 bytes;
 208                 __u64 pkts;
 209         } stats[nr_cpus];
 210         struct real_definition {
 211                 union {
 212                         __be32 dst;
 213                         __be32 dstv6[4];
 214                 };
 215                 __u8 flags;
 216         } real_def = {.dst = MAGIC_VAL};
 217         __u32 ch_key = 11, real_num = 3;
 218         __u32 duration, retval, size;
 219         int err, i, prog_fd, map_fd;
 220         __u64 bytes = 0, pkts = 0;
 221         struct bpf_object *obj;
 222         char buf[128];
 223         u32 *magic = (u32 *)buf;
 224
 225         err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
 226         if (err)
 227                 return;
 228
 229         map_fd = bpf_find_map(__func__, obj, "vip_map");
 230         if (map_fd < 0)
 231                 goto out;
 232         bpf_map_update_elem(map_fd, &key, &value, 0);
 233
 234         map_fd = bpf_find_map(__func__, obj, "ch_rings");
 235         if (map_fd < 0)
 236                 goto out;
 237         bpf_map_update_elem(map_fd, &ch_key, &real_num, 0);
 238
 239         map_fd = bpf_find_map(__func__, obj, "reals");
 240         if (map_fd < 0)
 241                 goto out;
 242         bpf_map_update_elem(map_fd, &real_num, &real_def, 0);
 243
 244         err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v4, sizeof(pkt_v4),
 245                                 buf, &size, &retval, &duration);
 246         CHECK(err || errno || retval != 7/*TC_ACT_REDIRECT*/ || size != 54 ||
 247               *magic != MAGIC_VAL, "ipv4",
 248               "err %d errno %d retval %d size %d magic %x\n",
 249               err, errno, retval, size, *magic);
 250
 251         err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v6, sizeof(pkt_v6),
 252                                 buf, &size, &retval, &duration);
 253         CHECK(err || errno || retval != 7/*TC_ACT_REDIRECT*/ || size != 74 ||
 254               *magic != MAGIC_VAL, "ipv6",
 255               "err %d errno %d retval %d size %d magic %x\n",
 256               err, errno, retval, size, *magic);
 257
 258         map_fd = bpf_find_map(__func__, obj, "stats");
 259         if (map_fd < 0)
 260                 goto out;
 261         bpf_map_lookup_elem(map_fd, &stats_key, stats);
 262         for (i = 0; i < nr_cpus; i++) {
 263                 bytes += stats[i].bytes;
 264                 pkts += stats[i].pkts;
 265         }
 266         if (bytes != MAGIC_BYTES * NUM_ITER * 2 || pkts != NUM_ITER * 2) {
 267                 error_cnt++;
 268                 printf("test_l4lb:FAIL:stats %lld %lld\n", bytes, pkts);
 269         }
 270 out:
 271         bpf_object__close(obj);
 272 }
 273
 274 static void test_tcp_estats(void)
 275 {
 276         const char *file = "./test_tcp_estats.o";
 277         int err, prog_fd;
 278         struct bpf_object *obj;
 279         __u32 duration = 0;
 280
 281         err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
 282         CHECK(err, "", "err %d errno %d\n", err, errno);
 283         if (err)
 284                 return;
 285
 286         bpf_object__close(obj);
 287 }
 288
 289 static inline __u64 ptr_to_u64(const void *ptr)
 290 {
 291         return (__u64) (unsigned long) ptr;
 292 }
 293
 294 static void test_bpf_obj_id(void)
 295 {
 296         const __u64 array_magic_value = 0xfaceb00c;
 297         const __u32 array_key = 0;
 298         const int nr_iters = 2;
 299         const char *file = "./test_obj_id.o";
 300         const char *jit_sysctl = "/proc/sys/net/core/bpf_jit_enable";
 301
 302         struct bpf_object *objs[nr_iters];
 303         int prog_fds[nr_iters], map_fds[nr_iters];
 304         /* +1 to test for the info_len returned by kernel */
 305         struct bpf_prog_info prog_infos[nr_iters + 1];
 306         struct bpf_map_info map_infos[nr_iters + 1];
 307         char jited_insns[128], xlated_insns[128];
 308         __u32 i, next_id, info_len, nr_id_found, duration = 0;
 309         int sysctl_fd, jit_enabled = 0, err = 0;
 310         __u64 array_value;
 311
 312         sysctl_fd = open(jit_sysctl, 0, O_RDONLY);
 313         if (sysctl_fd != -1) {
 314                 char tmpc;
 315
 316                 if (read(sysctl_fd, &tmpc, sizeof(tmpc)) == 1)
 317                         jit_enabled = (tmpc != '0');
 318                 close(sysctl_fd);
 319         }
 320
 321         err = bpf_prog_get_fd_by_id(0);
 322         CHECK(err >= 0 || errno != ENOENT,
 323               "get-fd-by-notexist-prog-id", "err %d errno %d\n", err, errno);
 324
 325         err = bpf_map_get_fd_by_id(0);
 326         CHECK(err >= 0 || errno != ENOENT,
 327               "get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno);
 328
 329         for (i = 0; i < nr_iters; i++)
 330                 objs[i] = NULL;
 331
 332         /* Check bpf_obj_get_info_by_fd() */
 333         for (i = 0; i < nr_iters; i++) {
 334                 err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER,
 335                                     &objs[i], &prog_fds[i]);
 336                 /* test_obj_id.o is a dumb prog. It should never fail
 337                  * to load.
 338                  */
 339                 assert(!err);
 340
 341                 /* Check getting prog info */
 342                 info_len = sizeof(struct bpf_prog_info) * 2;
 343                 bzero(&prog_infos[i], info_len);
 344                 prog_infos[i].jited_prog_insns = ptr_to_u64(jited_insns);
 345                 prog_infos[i].jited_prog_len = sizeof(jited_insns);
 346                 prog_infos[i].xlated_prog_insns = ptr_to_u64(xlated_insns);
 347                 prog_infos[i].xlated_prog_len = sizeof(xlated_insns);
 348                 err = bpf_obj_get_info_by_fd(prog_fds[i], &prog_infos[i],
 349                                              &info_len);
 350                 if (CHECK(err ||
 351                           prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER ||
 352                           info_len != sizeof(struct bpf_prog_info) ||
 353                           (jit_enabled && !prog_infos[i].jited_prog_len) ||
 354                           !prog_infos[i].xlated_prog_len,
 355                           "get-prog-info(fd)",
 356                           "err %d errno %d i %d type %d(%d) info_len %u(%lu) jit_enabled %d jited_prog_len %u xlated_prog_len %u\n",
 357                           err, errno, i,
 358                           prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
 359                           info_len, sizeof(struct bpf_prog_info),
 360                           jit_enabled,
 361                           prog_infos[i].jited_prog_len,
 362                           prog_infos[i].xlated_prog_len))
 363                         goto done;
 364
 365                 map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id");
 366                 assert(map_fds[i] >= 0);
 367                 err = bpf_map_update_elem(map_fds[i], &array_key,
 368                                           &array_magic_value, 0);
 369                 assert(!err);
 370
 371                 /* Check getting map info */
 372                 info_len = sizeof(struct bpf_map_info) * 2;
 373                 bzero(&map_infos[i], info_len);
 374                 err = bpf_obj_get_info_by_fd(map_fds[i], &map_infos[i],
 375                                              &info_len);
 376                 if (CHECK(err ||
 377                           map_infos[i].type != BPF_MAP_TYPE_ARRAY ||
 378                           map_infos[i].key_size != sizeof(__u32) ||
 379                           map_infos[i].value_size != sizeof(__u64) ||
 380                           map_infos[i].max_entries != 1 ||
 381                           map_infos[i].map_flags != 0 ||
 382                           info_len != sizeof(struct bpf_map_info),
 383                           "get-map-info(fd)",
 384                           "err %d errno %d type %d(%d) info_len %u(%lu) key_size %u value_size %u max_entries %u map_flags %X\n",
 385                           err, errno,
 386                           map_infos[i].type, BPF_MAP_TYPE_ARRAY,
 387                           info_len, sizeof(struct bpf_map_info),
 388                           map_infos[i].key_size,
 389                           map_infos[i].value_size,
 390                           map_infos[i].max_entries,
 391                           map_infos[i].map_flags))
 392                         goto done;
 393         }
 394
 395         /* Check bpf_prog_get_next_id() */
 396         nr_id_found = 0;
 397         next_id = 0;
 398         while (!bpf_prog_get_next_id(next_id, &next_id)) {
 399                 struct bpf_prog_info prog_info = {};
 400                 int prog_fd;
 401
 402                 info_len = sizeof(prog_info);
 403
 404                 prog_fd = bpf_prog_get_fd_by_id(next_id);
 405                 if (prog_fd < 0 && errno == ENOENT)
 406                         /* The bpf_prog is in the dead row */
 407                         continue;
 408                 if (CHECK(prog_fd < 0, "get-prog-fd(next_id)",
 409                           "prog_fd %d next_id %d errno %d\n",
 410                           prog_fd, next_id, errno))
 411                         break;
 412
 413                 for (i = 0; i < nr_iters; i++)
 414                         if (prog_infos[i].id == next_id)
 415                                 break;
 416
 417                 if (i == nr_iters)
 418                         continue;
 419
 420                 nr_id_found++;
 421
 422                 err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
 423                 prog_infos[i].jited_prog_insns = 0;
 424                 prog_infos[i].xlated_prog_insns = 0;
 425                 CHECK(err || info_len != sizeof(struct bpf_prog_info) ||
 426                       memcmp(&prog_info, &prog_infos[i], info_len),
 427                       "get-prog-info(next_id->fd)",
 428                       "err %d errno %d info_len %u(%lu) memcmp %d\n",
 429                       err, errno, info_len, sizeof(struct bpf_prog_info),
 430                       memcmp(&prog_info, &prog_infos[i], info_len));
 431
 432                 close(prog_fd);
 433         }
 434         CHECK(nr_id_found != nr_iters,
 435               "check total prog id found by get_next_id",
 436               "nr_id_found %u(%u)\n",
 437               nr_id_found, nr_iters);
 438
 439         /* Check bpf_map_get_next_id() */
 440         nr_id_found = 0;
 441         next_id = 0;
 442         while (!bpf_map_get_next_id(next_id, &next_id)) {
 443                 struct bpf_map_info map_info = {};
 444                 int map_fd;
 445
 446                 info_len = sizeof(map_info);
 447
 448                 map_fd = bpf_map_get_fd_by_id(next_id);
 449                 if (map_fd < 0 && errno == ENOENT)
 450                         /* The bpf_map is in the dead row */
 451                         continue;
 452                 if (CHECK(map_fd < 0, "get-map-fd(next_id)",
 453                           "map_fd %d next_id %u errno %d\n",
 454                           map_fd, next_id, errno))
 455                         break;
 456
 457                 for (i = 0; i < nr_iters; i++)
 458                         if (map_infos[i].id == next_id)
 459                                 break;
 460
 461                 if (i == nr_iters)
 462                         continue;
 463
 464                 nr_id_found++;
 465
 466                 err = bpf_map_lookup_elem(map_fd, &array_key, &array_value);
 467                 assert(!err);
 468
 469                 err = bpf_obj_get_info_by_fd(map_fd, &map_info, &info_len);
 470                 CHECK(err || info_len != sizeof(struct bpf_map_info) ||
 471                       memcmp(&map_info, &map_infos[i], info_len) ||
 472                       array_value != array_magic_value,
 473                       "check get-map-info(next_id->fd)",
 474                       "err %d errno %d info_len %u(%lu) memcmp %d array_value %llu(%llu)\n",
 475                       err, errno, info_len, sizeof(struct bpf_map_info),
 476                       memcmp(&map_info, &map_infos[i], info_len),
 477                       array_value, array_magic_value);
 478
 479                 close(map_fd);
 480         }
 481         CHECK(nr_id_found != nr_iters,
 482               "check total map id found by get_next_id",
 483               "nr_id_found %u(%u)\n",
 484               nr_id_found, nr_iters);
 485
 486 done:
 487         for (i = 0; i < nr_iters; i++)
 488                 bpf_object__close(objs[i]);
 489 }
 490
 491 static void test_pkt_md_access(void)
 492 {
 493         const char *file = "./test_pkt_md_access.o";
 494         struct bpf_object *obj;
 495         __u32 duration, retval;
 496         int err, prog_fd;
 497
 498         err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
 499         if (err)
 500                 return;
 501
 502         err = bpf_prog_test_run(prog_fd, 10, &pkt_v4, sizeof(pkt_v4),
 503                                 NULL, NULL, &retval, &duration);
 504         CHECK(err || retval, "",
 505               "err %d errno %d retval %d duration %d\n",
 506               err, errno, retval, duration);
 507
 508         bpf_object__close(obj);
 509 }
 510
 511 int main(void)
 512 {
 513         struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
 514
 515         setrlimit(RLIMIT_MEMLOCK, &rinf);
 516
 517         test_pkt_access();
 518         test_xdp();
 519         test_l4lb();
 520         test_tcp_estats();
 521         test_bpf_obj_id();
 522         test_pkt_md_access();
 523
 524         printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
 525         return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
 526 }