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selftests/net: Add SHA256 computation over data sent in tcp_mmap

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Add option to compute and send SHA256 over data sent (-i).

This is to ensure the correctness of data received.
Data is randomly populated from /dev/urandom.

Tested:
./tcp_mmap -s -z -i
./tcp_mmap -z -H $ADDR -i
SHA256 is correct

./tcp_mmap -s -i
./tcp_mmap -H $ADDR -i
SHA256 is correct

Signed-off-by: Coco Li <lixiaoyan@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230321081202.2370275-2-lixiaoyan@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Xiaoyan Li 2023-03-21 16:12:02 +08:00 committed by Paolo Abeni
parent 593ef60c74
commit 5c5945dc69
2 changed files with 92 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
tools/testing/selftests/net/Makefile
View file

@ -89,7 +89,7 @@ TEST_FILES := settings
include ../lib.mk
$(OUTPUT)/reuseport_bpf_numa: LDLIBS += -lnuma
$(OUTPUT)/tcp_mmap: LDLIBS += -lpthread
$(OUTPUT)/tcp_mmap: LDLIBS += -lpthread -lcrypto
$(OUTPUT)/tcp_inq: LDLIBS += -lpthread
$(OUTPUT)/bind_bhash: LDLIBS += -lpthread

102
tools/testing/selftests/net/tcp_mmap.c
View file

@ -66,11 +66,16 @@
#include <poll.h>
#include <linux/tcp.h>
#include <assert.h>
#include <openssl/pem.h>
#ifndef MSG_ZEROCOPY
#define MSG_ZEROCOPY 0x4000000
#endif
#ifndef min
#define min(a, b) ((a) < (b) ? (a) : (b))
#endif
#define FILE_SZ (1ULL << 35)
static int cfg_family = AF_INET6;
static socklen_t cfg_alen = sizeof(struct sockaddr_in6);
@ -81,12 +86,14 @@ static int sndbuf; /* Default: autotuning. Can be set with -w <integer> option
static int zflg; /* zero copy option. (MSG_ZEROCOPY for sender, mmap() for receiver */
static int xflg; /* hash received data (simple xor) (-h option) */
static int keepflag; /* -k option: receiver shall keep all received file in memory (no munmap() calls) */
static int integrity; /* -i option: sender and receiver compute sha256 over the data.*/
static size_t chunk_size = 512*1024;
static size_t map_align;
unsigned long htotal;
unsigned int digest_len;
static inline void prefetch(const void *x)
{
@ -148,12 +155,14 @@ static void *mmap_large_buffer(size_t need, size_t *allocated)
void *child_thread(void *arg)
{
unsigned char digest[SHA256_DIGEST_LENGTH];
unsigned long total_mmap = 0, total = 0;
struct tcp_zerocopy_receive zc;
unsigned char *buffer = NULL;
unsigned long delta_usec;
EVP_MD_CTX *ctx = NULL;
int flags = MAP_SHARED;
struct timeval t0, t1;
char *buffer = NULL;
void *raddr = NULL;
void *addr = NULL;
double throughput;
@ -180,6 +189,14 @@ void *child_thread(void *arg)
addr = ALIGN_PTR_UP(raddr, map_align);
}
}
if (integrity) {
ctx = EVP_MD_CTX_new();
if (!ctx) {
perror("cannot enable SHA computing");
goto error;
}
EVP_DigestInit_ex(ctx, EVP_sha256(), NULL);
}
while (1) {
struct pollfd pfd = { .fd = fd, .events = POLLIN, };
int sub;
@ -191,7 +208,7 @@ void *child_thread(void *arg)
memset(&zc, 0, sizeof(zc));
zc.address = (__u64)((unsigned long)addr);
zc.length = chunk_size;
zc.length = min(chunk_size, FILE_SZ - lu);
res = getsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE,
&zc, &zc_len);
@ -200,6 +217,8 @@ void *child_thread(void *arg)
if (zc.length) {
assert(zc.length <= chunk_size);
if (integrity)
EVP_DigestUpdate(ctx, addr, zc.length);
total_mmap += zc.length;
if (xflg)
hash_zone(addr, zc.length);
@ -211,22 +230,30 @@ void *child_thread(void *arg)
}
if (zc.recv_skip_hint) {
assert(zc.recv_skip_hint <= chunk_size);
lu = read(fd, buffer, zc.recv_skip_hint);
lu = read(fd, buffer, min(zc.recv_skip_hint,
FILE_SZ - total));
if (lu > 0) {
if (integrity)
EVP_DigestUpdate(ctx, buffer, lu);
if (xflg)
hash_zone(buffer, lu);
total += lu;
}
if (lu == 0)
goto end;
}
continue;
}
sub = 0;
while (sub < chunk_size) {
lu = read(fd, buffer + sub, chunk_size - sub);
lu = read(fd, buffer + sub, min(chunk_size - sub,
FILE_SZ - total));
if (lu == 0)
goto end;
if (lu < 0)
break;
if (integrity)
EVP_DigestUpdate(ctx, buffer + sub, lu);
if (xflg)
hash_zone(buffer + sub, lu);
total += lu;
@ -237,6 +264,20 @@ void *child_thread(void *arg)
gettimeofday(&t1, NULL);
delta_usec = (t1.tv_sec - t0.tv_sec) * 1000000 + t1.tv_usec - t0.tv_usec;
if (integrity) {
fcntl(fd, F_SETFL, 0);
EVP_DigestFinal_ex(ctx, digest, &digest_len);
lu = read(fd, buffer, SHA256_DIGEST_LENGTH);
if (lu != SHA256_DIGEST_LENGTH)
perror("Error: Cannot read SHA256\n");
if (memcmp(digest, buffer,
SHA256_DIGEST_LENGTH))
fprintf(stderr, "Error: SHA256 of the data is not right\n");
else
printf("\nSHA256 is correct\n");
}
throughput = 0;
if (delta_usec)
throughput = total * 8.0 / (double)delta_usec / 1000.0;
@ -368,19 +409,38 @@ static unsigned long default_huge_page_size(void)
return hps;
}
static void randomize(void *target, size_t count)
{
static int urandom = -1;
ssize_t got;
urandom = open("/dev/urandom", O_RDONLY);
if (urandom < 0) {
perror("open /dev/urandom");
exit(1);
}
got = read(urandom, target, count);
if (got != count) {
perror("read /dev/urandom");
exit(1);
}
}
int main(int argc, char *argv[])
{
unsigned char digest[SHA256_DIGEST_LENGTH];
struct sockaddr_storage listenaddr, addr;
unsigned int max_pacing_rate = 0;
EVP_MD_CTX *ctx = NULL;
unsigned char *buffer;
uint64_t total = 0;
char *host = NULL;
int fd, c, on = 1;
size_t buffer_sz;
char *buffer;
int sflg = 0;
int mss = 0;
while ((c = getopt(argc, argv, "46p:svr:w:H:zxkP:M:C:a:")) != -1) {
while ((c = getopt(argc, argv, "46p:svr:w:H:zxkP:M:C:a:i")) != -1) {
switch (c) {
case '4':
cfg_family = PF_INET;
@ -426,6 +486,9 @@ int main(int argc, char *argv[])
case 'a':
map_align = atol(optarg);
break;
case 'i':
integrity = 1;
break;
default:
exit(1);
}
@ -468,7 +531,7 @@ int main(int argc, char *argv[])
}
buffer = mmap_large_buffer(chunk_size, &buffer_sz);
if (buffer == (char *)-1) {
if (buffer == (unsigned char *)-1) {
perror("mmap");
exit(1);
}
@ -501,17 +564,34 @@ int main(int argc, char *argv[])
perror("setsockopt SO_ZEROCOPY, (-z option disabled)");
zflg = 0;
}
if (integrity) {
randomize(buffer, buffer_sz);
ctx = EVP_MD_CTX_new();
if (!ctx) {
perror("cannot enable SHA computing");
exit(1);
}
EVP_DigestInit_ex(ctx, EVP_sha256(), NULL);
}
while (total < FILE_SZ) {
size_t offset = total % chunk_size;
int64_t wr = FILE_SZ - total;
if (wr > chunk_size)
wr = chunk_size;
/* Note : we just want to fill the pipe with 0 bytes */
wr = send(fd, buffer, (size_t)wr, zflg ? MSG_ZEROCOPY : 0);
if (wr > chunk_size - offset)
wr = chunk_size - offset;
/* Note : we just want to fill the pipe with random bytes */
wr = send(fd, buffer + offset,
(size_t)wr, zflg ? MSG_ZEROCOPY : 0);
if (wr <= 0)
break;
if (integrity)
EVP_DigestUpdate(ctx, buffer + offset, wr);
total += wr;
}
if (integrity && total == FILE_SZ) {
EVP_DigestFinal_ex(ctx, digest, &digest_len);
send(fd, digest, (size_t)SHA256_DIGEST_LENGTH, 0);
}
close(fd);
munmap(buffer, buffer_sz);
return 0;