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// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "../kselftest.h"
static char *afstr(int af, int proto)
{
if (proto == IPPROTO_TCP)
return af == AF_INET ? "TCP/IPv4" : "TCP/IPv6";
else
return af == AF_INET ? "UDP/IPv4" : "UDP/IPv6";
}
int sk_peek_offset_probe(sa_family_t af, int proto)
{
int type = (proto == IPPROTO_TCP ? SOCK_STREAM : SOCK_DGRAM);
int optv = 0;
int ret = 0;
int s;
s = socket(af, type, proto);
if (s < 0) {
ksft_perror("Temporary TCP socket creation failed");
} else {
if (!setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &optv, sizeof(int)))
ret = 1;
else
printf("%s does not support SO_PEEK_OFF\n", afstr(af, proto));
close(s);
}
return ret;
}
static void sk_peek_offset_set(int s, int offset)
{
if (setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &offset, sizeof(offset)))
ksft_perror("Failed to set SO_PEEK_OFF value\n");
}
static int sk_peek_offset_get(int s)
{
int offset;
socklen_t len = sizeof(offset);
if (getsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &offset, &len))
ksft_perror("Failed to get SO_PEEK_OFF value\n");
return offset;
}
static int sk_peek_offset_test(sa_family_t af, int proto)
{
int type = (proto == IPPROTO_TCP ? SOCK_STREAM : SOCK_DGRAM);
union {
struct sockaddr sa;
struct sockaddr_in a4;
struct sockaddr_in6 a6;
} a;
int res = 0;
int s[2] = {0, 0};
int recv_sock = 0;
int offset = 0;
ssize_t len;
char buf[2];
memset(&a, 0, sizeof(a));
a.sa.sa_family = af;
s[0] = recv_sock = socket(af, type, proto);
s[1] = socket(af, type, proto);
if (s[0] < 0 || s[1] < 0) {
ksft_perror("Temporary socket creation failed\n");
goto out;
}
if (bind(s[0], &a.sa, sizeof(a)) < 0) {
ksft_perror("Temporary socket bind() failed\n");
goto out;
}
if (getsockname(s[0], &a.sa, &((socklen_t) { sizeof(a) })) < 0) {
ksft_perror("Temporary socket getsockname() failed\n");
goto out;
}
if (proto == IPPROTO_TCP && listen(s[0], 0) < 0) {
ksft_perror("Temporary socket listen() failed\n");
goto out;
}
if (connect(s[1], &a.sa, sizeof(a)) < 0) {
ksft_perror("Temporary socket connect() failed\n");
goto out;
}
if (proto == IPPROTO_TCP) {
recv_sock = accept(s[0], NULL, NULL);
if (recv_sock <= 0) {
ksft_perror("Temporary socket accept() failed\n");
goto out;
}
}
/* Some basic tests of getting/setting offset */
offset = sk_peek_offset_get(recv_sock);
if (offset != -1) {
ksft_perror("Initial value of socket offset not -1\n");
goto out;
}
sk_peek_offset_set(recv_sock, 0);
offset = sk_peek_offset_get(recv_sock);
if (offset != 0) {
ksft_perror("Failed to set socket offset to 0\n");
goto out;
}
/* Transfer a message */
if (send(s[1], (char *)("ab"), 2, 0) != 2) {
ksft_perror("Temporary probe socket send() failed\n");
goto out;
}
/* Read first byte */
len = recv(recv_sock, buf, 1, MSG_PEEK);
if (len != 1 || buf[0] != 'a') {
ksft_perror("Failed to read first byte of message\n");
goto out;
}
offset = sk_peek_offset_get(recv_sock);
if (offset != 1) {
ksft_perror("Offset not forwarded correctly at first byte\n");
goto out;
}
/* Try to read beyond last byte */
len = recv(recv_sock, buf, 2, MSG_PEEK);
if (len != 1 || buf[0] != 'b') {
ksft_perror("Failed to read last byte of message\n");
goto out;
}
offset = sk_peek_offset_get(recv_sock);
if (offset != 2) {
ksft_perror("Offset not forwarded correctly at last byte\n");
goto out;
}
/* Flush message */
len = recv(recv_sock, buf, 2, MSG_TRUNC);
if (len != 2) {
ksft_perror("Failed to flush message\n");
goto out;
}
offset = sk_peek_offset_get(recv_sock);
if (offset != 0) {
ksft_perror("Offset not reverted correctly after flush\n");
goto out;
}
printf("%s with MSG_PEEK_OFF works correctly\n", afstr(af, proto));
res = 1;
out:
if (proto == IPPROTO_TCP && recv_sock >= 0)
close(recv_sock);
if (s[1] >= 0)
close(s[1]);
if (s[0] >= 0)
close(s[0]);
return res;
}
static int do_test(int proto)
{
int res4, res6;
res4 = sk_peek_offset_probe(AF_INET, proto);
res6 = sk_peek_offset_probe(AF_INET6, proto);
if (!res4 && !res6)
return KSFT_SKIP;
if (res4)
res4 = sk_peek_offset_test(AF_INET, proto);
if (res6)
res6 = sk_peek_offset_test(AF_INET6, proto);
if (!res4 || !res6)
return KSFT_FAIL;
return KSFT_PASS;
}
int main(void)
{
int restcp, resudp;
restcp = do_test(IPPROTO_TCP);
resudp = do_test(IPPROTO_UDP);
if (restcp == KSFT_FAIL || resudp == KSFT_FAIL)
return KSFT_FAIL;
return KSFT_PASS;
}
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