/* Copyright (c) 2017 Facebook
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>

#include <linux/types.h>
typedef __u16 __sum16;
#include <arpa/inet.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>

#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <fcntl.h>

#include <linux/bpf.h>
#include <linux/err.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "test_iptunnel_common.h"
#include "bpf_util.h"
#include "bpf_endian.h"

static int error_cnt, pass_cnt;

#define MAGIC_BYTES 123

/* ipv4 test vector */
static struct {
	struct ethhdr eth;
	struct iphdr iph;
	struct tcphdr tcp;
} __packed pkt_v4 = {
	.eth.h_proto = bpf_htons(ETH_P_IP),
	.iph.ihl = 5,
	.iph.protocol = 6,
	.iph.tot_len = bpf_htons(MAGIC_BYTES),
	.tcp.urg_ptr = 123,
};

/* ipv6 test vector */
static struct {
	struct ethhdr eth;
	struct ipv6hdr iph;
	struct tcphdr tcp;
} __packed pkt_v6 = {
	.eth.h_proto = bpf_htons(ETH_P_IPV6),
	.iph.nexthdr = 6,
	.iph.payload_len = bpf_htons(MAGIC_BYTES),
	.tcp.urg_ptr = 123,
};

#define CHECK(condition, tag, format...) ({				\
	int __ret = !!(condition);					\
	if (__ret) {							\
		error_cnt++;						\
		printf("%s:FAIL:%s ", __func__, tag);			\
		printf(format);						\
	} else {							\
		pass_cnt++;						\
		printf("%s:PASS:%s %d nsec\n", __func__, tag, duration);\
	}								\
	__ret;								\
})

static int bpf_prog_load(const char *file, enum bpf_prog_type type,
			 struct bpf_object **pobj, int *prog_fd)
{
	struct bpf_program *prog;
	struct bpf_object *obj;
	int err;

	obj = bpf_object__open(file);
	if (IS_ERR(obj)) {
		error_cnt++;
		return -ENOENT;
	}

	prog = bpf_program__next(NULL, obj);
	if (!prog) {
		bpf_object__close(obj);
		error_cnt++;
		return -ENOENT;
	}

	bpf_program__set_type(prog, type);
	err = bpf_object__load(obj);
	if (err) {
		bpf_object__close(obj);
		error_cnt++;
		return -EINVAL;
	}

	*pobj = obj;
	*prog_fd = bpf_program__fd(prog);
	return 0;
}

static int bpf_find_map(const char *test, struct bpf_object *obj,
			const char *name)
{
	struct bpf_map *map;

	map = bpf_object__find_map_by_name(obj, name);
	if (!map) {
		printf("%s:FAIL:map '%s' not found\n", test, name);
		error_cnt++;
		return -1;
	}
	return bpf_map__fd(map);
}

static void test_pkt_access(void)
{
	const char *file = "./test_pkt_access.o";
	struct bpf_object *obj;
	__u32 duration, retval;
	int err, prog_fd;

	err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
	if (err)
		return;

	err = bpf_prog_test_run(prog_fd, 100000, &pkt_v4, sizeof(pkt_v4),
				NULL, NULL, &retval, &duration);
	CHECK(err || errno || retval, "ipv4",
	      "err %d errno %d retval %d duration %d\n",
	      err, errno, retval, duration);

	err = bpf_prog_test_run(prog_fd, 100000, &pkt_v6, sizeof(pkt_v6),
				NULL, NULL, &retval, &duration);
	CHECK(err || errno || retval, "ipv6",
	      "err %d errno %d retval %d duration %d\n",
	      err, errno, retval, duration);
	bpf_object__close(obj);
}

static void test_xdp(void)
{
	struct vip key4 = {.protocol = 6, .family = AF_INET};
	struct vip key6 = {.protocol = 6, .family = AF_INET6};
	struct iptnl_info value4 = {.family = AF_INET};
	struct iptnl_info value6 = {.family = AF_INET6};
	const char *file = "./test_xdp.o";
	struct bpf_object *obj;
	char buf[128];
	struct ipv6hdr *iph6 = (void *)buf + sizeof(struct ethhdr);
	struct iphdr *iph = (void *)buf + sizeof(struct ethhdr);
	__u32 duration, retval, size;
	int err, prog_fd, map_fd;

	err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
	if (err)
		return;

	map_fd = bpf_find_map(__func__, obj, "vip2tnl");
	if (map_fd < 0)
		goto out;
	bpf_map_update_elem(map_fd, &key4, &value4, 0);
	bpf_map_update_elem(map_fd, &key6, &value6, 0);

	err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
				buf, &size, &retval, &duration);

	CHECK(err || errno || retval != XDP_TX || size != 74 ||
	      iph->protocol != IPPROTO_IPIP, "ipv4",
	      "err %d errno %d retval %d size %d\n",
	      err, errno, retval, size);

	err = bpf_prog_test_run(prog_fd, 1, &pkt_v6, sizeof(pkt_v6),
				buf, &size, &retval, &duration);
	CHECK(err || errno || retval != XDP_TX || size != 114 ||
	      iph6->nexthdr != IPPROTO_IPV6, "ipv6",
	      "err %d errno %d retval %d size %d\n",
	      err, errno, retval, size);
out:
	bpf_object__close(obj);
}

#define MAGIC_VAL 0x1234
#define NUM_ITER 100000
#define VIP_NUM 5

static void test_l4lb(void)
{
	unsigned int nr_cpus = bpf_num_possible_cpus();
	const char *file = "./test_l4lb.o";
	struct vip key = {.protocol = 6};
	struct vip_meta {
		__u32 flags;
		__u32 vip_num;
	} value = {.vip_num = VIP_NUM};
	__u32 stats_key = VIP_NUM;
	struct vip_stats {
		__u64 bytes;
		__u64 pkts;
	} stats[nr_cpus];
	struct real_definition {
		union {
			__be32 dst;
			__be32 dstv6[4];
		};
		__u8 flags;
	} real_def = {.dst = MAGIC_VAL};
	__u32 ch_key = 11, real_num = 3;
	__u32 duration, retval, size;
	int err, i, prog_fd, map_fd;
	__u64 bytes = 0, pkts = 0;
	struct bpf_object *obj;
	char buf[128];
	u32 *magic = (u32 *)buf;

	err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
	if (err)
		return;

	map_fd = bpf_find_map(__func__, obj, "vip_map");
	if (map_fd < 0)
		goto out;
	bpf_map_update_elem(map_fd, &key, &value, 0);

	map_fd = bpf_find_map(__func__, obj, "ch_rings");
	if (map_fd < 0)
		goto out;
	bpf_map_update_elem(map_fd, &ch_key, &real_num, 0);

	map_fd = bpf_find_map(__func__, obj, "reals");
	if (map_fd < 0)
		goto out;
	bpf_map_update_elem(map_fd, &real_num, &real_def, 0);

	err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v4, sizeof(pkt_v4),
				buf, &size, &retval, &duration);
	CHECK(err || errno || retval != 7/*TC_ACT_REDIRECT*/ || size != 54 ||
	      *magic != MAGIC_VAL, "ipv4",
	      "err %d errno %d retval %d size %d magic %x\n",
	      err, errno, retval, size, *magic);

	err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v6, sizeof(pkt_v6),
				buf, &size, &retval, &duration);
	CHECK(err || errno || retval != 7/*TC_ACT_REDIRECT*/ || size != 74 ||
	      *magic != MAGIC_VAL, "ipv6",
	      "err %d errno %d retval %d size %d magic %x\n",
	      err, errno, retval, size, *magic);

	map_fd = bpf_find_map(__func__, obj, "stats");
	if (map_fd < 0)
		goto out;
	bpf_map_lookup_elem(map_fd, &stats_key, stats);
	for (i = 0; i < nr_cpus; i++) {
		bytes += stats[i].bytes;
		pkts += stats[i].pkts;
	}
	if (bytes != MAGIC_BYTES * NUM_ITER * 2 || pkts != NUM_ITER * 2) {
		error_cnt++;
		printf("test_l4lb:FAIL:stats %lld %lld\n", bytes, pkts);
	}
out:
	bpf_object__close(obj);
}

static void test_tcp_estats(void)
{
	const char *file = "./test_tcp_estats.o";
	int err, prog_fd;
	struct bpf_object *obj;
	__u32 duration = 0;

	err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
	CHECK(err, "", "err %d errno %d\n", err, errno);
	if (err)
		return;

	bpf_object__close(obj);
}

static inline __u64 ptr_to_u64(const void *ptr)
{
	return (__u64) (unsigned long) ptr;
}

static void test_bpf_obj_id(void)
{
	const __u64 array_magic_value = 0xfaceb00c;
	const __u32 array_key = 0;
	const int nr_iters = 2;
	const char *file = "./test_obj_id.o";
	const char *jit_sysctl = "/proc/sys/net/core/bpf_jit_enable";

	struct bpf_object *objs[nr_iters];
	int prog_fds[nr_iters], map_fds[nr_iters];
	/* +1 to test for the info_len returned by kernel */
	struct bpf_prog_info prog_infos[nr_iters + 1];
	struct bpf_map_info map_infos[nr_iters + 1];
	char jited_insns[128], xlated_insns[128];
	__u32 i, next_id, info_len, nr_id_found, duration = 0;
	int sysctl_fd, jit_enabled = 0, err = 0;
	__u64 array_value;

	sysctl_fd = open(jit_sysctl, 0, O_RDONLY);
	if (sysctl_fd != -1) {
		char tmpc;

		if (read(sysctl_fd, &tmpc, sizeof(tmpc)) == 1)
			jit_enabled = (tmpc != '0');
		close(sysctl_fd);
	}

	err = bpf_prog_get_fd_by_id(0);
	CHECK(err >= 0 || errno != ENOENT,
	      "get-fd-by-notexist-prog-id", "err %d errno %d\n", err, errno);

	err = bpf_map_get_fd_by_id(0);
	CHECK(err >= 0 || errno != ENOENT,
	      "get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno);

	for (i = 0; i < nr_iters; i++)
		objs[i] = NULL;

	/* Check bpf_obj_get_info_by_fd() */
	for (i = 0; i < nr_iters; i++) {
		err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER,
				    &objs[i], &prog_fds[i]);
		/* test_obj_id.o is a dumb prog. It should never fail
		 * to load.
		 */
		assert(!err);

		/* Check getting prog info */
		info_len = sizeof(struct bpf_prog_info) * 2;
		prog_infos[i].jited_prog_insns = ptr_to_u64(jited_insns);
		prog_infos[i].jited_prog_len = sizeof(jited_insns);
		prog_infos[i].xlated_prog_insns = ptr_to_u64(xlated_insns);
		prog_infos[i].xlated_prog_len = sizeof(xlated_insns);
		err = bpf_obj_get_info_by_fd(prog_fds[i], &prog_infos[i],
					     &info_len);
		if (CHECK(err ||
			  prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER ||
			  info_len != sizeof(struct bpf_prog_info) ||
			  (jit_enabled && !prog_infos[i].jited_prog_len) ||
			  !prog_infos[i].xlated_prog_len,
			  "get-prog-info(fd)",
			  "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",
			  err, errno, i,
			  prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
			  info_len, sizeof(struct bpf_prog_info),
			  jit_enabled,
			  prog_infos[i].jited_prog_len,
			  prog_infos[i].xlated_prog_len))
			goto done;

		map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id");
		assert(map_fds[i] >= 0);
		err = bpf_map_update_elem(map_fds[i], &array_key,
					  &array_magic_value, 0);
		assert(!err);

		/* Check getting map info */
		info_len = sizeof(struct bpf_map_info) * 2;
		err = bpf_obj_get_info_by_fd(map_fds[i], &map_infos[i],
					     &info_len);
		if (CHECK(err ||
			  map_infos[i].type != BPF_MAP_TYPE_ARRAY ||
			  map_infos[i].key_size != sizeof(__u32) ||
			  map_infos[i].value_size != sizeof(__u64) ||
			  map_infos[i].max_entries != 1 ||
			  map_infos[i].map_flags != 0 ||
			  info_len != sizeof(struct bpf_map_info),
			  "get-map-info(fd)",
			  "err %d errno %d type %d(%d) info_len %u(%lu) key_size %u value_size %u max_entries %u map_flags %X\n",
			  err, errno,
			  map_infos[i].type, BPF_MAP_TYPE_ARRAY,
			  info_len, sizeof(struct bpf_map_info),
			  map_infos[i].key_size,
			  map_infos[i].value_size,
			  map_infos[i].max_entries,
			  map_infos[i].map_flags))
			goto done;
	}

	/* Check bpf_prog_get_next_id() */
	nr_id_found = 0;
	next_id = 0;
	while (!bpf_prog_get_next_id(next_id, &next_id)) {
		struct bpf_prog_info prog_info;
		int prog_fd;

		info_len = sizeof(prog_info);

		prog_fd = bpf_prog_get_fd_by_id(next_id);
		if (prog_fd < 0 && errno == ENOENT)
			/* The bpf_prog is in the dead row */
			continue;
		if (CHECK(prog_fd < 0, "get-prog-fd(next_id)",
			  "prog_fd %d next_id %d errno %d\n",
			  prog_fd, next_id, errno))
			break;

		for (i = 0; i < nr_iters; i++)
			if (prog_infos[i].id == next_id)
				break;

		if (i == nr_iters)
			continue;

		nr_id_found++;

		err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
		CHECK(err || info_len != sizeof(struct bpf_prog_info) ||
		      memcmp(&prog_info, &prog_infos[i], info_len),
		      "get-prog-info(next_id->fd)",
		      "err %d errno %d info_len %u(%lu) memcmp %d\n",
		      err, errno, info_len, sizeof(struct bpf_prog_info),
		      memcmp(&prog_info, &prog_infos[i], info_len));

		close(prog_fd);
	}
	CHECK(nr_id_found != nr_iters,
	      "check total prog id found by get_next_id",
	      "nr_id_found %u(%u)\n",
	      nr_id_found, nr_iters);

	/* Check bpf_map_get_next_id() */
	nr_id_found = 0;
	next_id = 0;
	while (!bpf_map_get_next_id(next_id, &next_id)) {
		struct bpf_map_info map_info;
		int map_fd;

		info_len = sizeof(map_info);

		map_fd = bpf_map_get_fd_by_id(next_id);
		if (map_fd < 0 && errno == ENOENT)
			/* The bpf_map is in the dead row */
			continue;
		if (CHECK(map_fd < 0, "get-map-fd(next_id)",
			  "map_fd %d next_id %u errno %d\n",
			  map_fd, next_id, errno))
			break;

		for (i = 0; i < nr_iters; i++)
			if (map_infos[i].id == next_id)
				break;

		if (i == nr_iters)
			continue;

		nr_id_found++;

		err = bpf_map_lookup_elem(map_fd, &array_key, &array_value);
		assert(!err);

		err = bpf_obj_get_info_by_fd(map_fd, &map_info, &info_len);
		CHECK(err || info_len != sizeof(struct bpf_map_info) ||
		      memcmp(&map_info, &map_infos[i], info_len) ||
		      array_value != array_magic_value,
		      "check get-map-info(next_id->fd)",
		      "err %d errno %d info_len %u(%lu) memcmp %d array_value %llu(%llu)\n",
		      err, errno, info_len, sizeof(struct bpf_map_info),
		      memcmp(&map_info, &map_infos[i], info_len),
		      array_value, array_magic_value);

		close(map_fd);
	}
	CHECK(nr_id_found != nr_iters,
	      "check total map id found by get_next_id",
	      "nr_id_found %u(%u)\n",
	      nr_id_found, nr_iters);

done:
	for (i = 0; i < nr_iters; i++)
		bpf_object__close(objs[i]);
}

static void test_pkt_md_access(void)
{
	const char *file = "./test_pkt_md_access.o";
	struct bpf_object *obj;
	__u32 duration, retval;
	int err, prog_fd;

	err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
	if (err)
		return;

	err = bpf_prog_test_run(prog_fd, 10, &pkt_v4, sizeof(pkt_v4),
				NULL, NULL, &retval, &duration);
	CHECK(err || retval, "",
	      "err %d errno %d retval %d duration %d\n",
	      err, errno, retval, duration);

	bpf_object__close(obj);
}

int main(void)
{
	struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };

	setrlimit(RLIMIT_MEMLOCK, &rinf);

	test_pkt_access();
	test_xdp();
	test_l4lb();
	test_tcp_estats();
	test_bpf_obj_id();
	test_pkt_md_access();

	printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
	return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
}