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selftests/bpf: add a test for overlapping packet range checks

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add simple C test case for llvm and verifier range check fix from
commit b1977682a3 ("bpf: improve verifier packet range checks")

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov
2017-03-30 21:45:41 -07:00
committed by David S. Miller
parent dd26b7f54a
commit 6882804c91
3 changed files with 215 additions and 4 deletions
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138
tools/testing/selftests/bpf/test_progs.c Normal file
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/* 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 <linux/bpf.h>
#include <linux/err.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#define _htons __builtin_bswap16
static int error_cnt, pass_cnt;
/* ipv4 test vector */
static struct {
struct ethhdr eth;
struct iphdr iph;
struct tcphdr tcp;
} __packed pkt_v4 = {
.eth.h_proto = _htons(ETH_P_IP),
.iph.ihl = 5,
.iph.protocol = 6,
.tcp.urg_ptr = 123,
};
/* ipv6 test vector */
static struct {
struct ethhdr eth;
struct ipv6hdr iph;
struct tcphdr tcp;
} __packed pkt_v6 = {
.eth.h_proto = _htons(ETH_P_IPV6),
.iph.nexthdr = 6,
.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);\
} \
})
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 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);
}
int main(void)
{
struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
setrlimit(RLIMIT_MEMLOCK, &rinf);
test_pkt_access();
printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
return 0;
}