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selftests/bpf: Move open_tuntap to network helpers

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To test the XDP metadata functionality of the tun driver, it's necessary
to create a new tap device first. A helper function for this already
exists in lwt_helpers.h. Move it to the common network helpers header,
so it can be reused in other tests.

Signed-off-by: Marcus Wichelmann <marcus.wichelmann@hetzner-cloud.de>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250305213438.3863922-4-marcus.wichelmann@hetzner-cloud.de
This commit is contained in:
Marcus Wichelmann 2025-03-05 21:34:35 +00:00 committed by Martin KaFai Lau
parent 0ca23a4d64
commit d5ca409c86
3 changed files with 31 additions and 29 deletions
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28
tools/testing/selftests/bpf/network_helpers.c
View File

@ -548,6 +548,34 @@ void close_netns(struct nstoken *token)
free(token);
}
int open_tuntap(const char *dev_name, bool need_mac)
{
int err = 0;
struct ifreq ifr;
int fd = open("/dev/net/tun", O_RDWR);
if (!ASSERT_GT(fd, 0, "open(/dev/net/tun)"))
return -1;
ifr.ifr_flags = IFF_NO_PI | (need_mac ? IFF_TAP : IFF_TUN);
strncpy(ifr.ifr_name, dev_name, IFNAMSIZ - 1);
ifr.ifr_name[IFNAMSIZ - 1] = '\0';
err = ioctl(fd, TUNSETIFF, &ifr);
if (!ASSERT_OK(err, "ioctl(TUNSETIFF)")) {
close(fd);
return -1;
}
err = fcntl(fd, F_SETFL, O_NONBLOCK);
if (!ASSERT_OK(err, "fcntl(O_NONBLOCK)")) {
close(fd);
return -1;
}
return fd;
}
int get_socket_local_port(int sock_fd)
{
struct sockaddr_storage addr;

3
tools/testing/selftests/bpf/network_helpers.h
View File

@ -8,6 +8,7 @@
typedef __u16 __sum16;
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/ethtool.h>
@ -85,6 +86,8 @@ int get_socket_local_port(int sock_fd);
int get_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param);
int set_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param);
int open_tuntap(const char *dev_name, bool need_mac);
struct nstoken;
/**
* open_netns() - Switch to specified network namespace by name.

29
tools/testing/selftests/bpf/prog_tests/lwt_helpers.h
View File

@ -5,7 +5,6 @@
#include <time.h>
#include <net/if.h>
#include <linux/if_tun.h>
#include <linux/icmp.h>
#include "test_progs.h"
@ -37,34 +36,6 @@ static inline int netns_delete(void)
return system("ip netns del " NETNS ">/dev/null 2>&1");
}
static int open_tuntap(const char *dev_name, bool need_mac)
{
int err = 0;
struct ifreq ifr;
int fd = open("/dev/net/tun", O_RDWR);
if (!ASSERT_GT(fd, 0, "open(/dev/net/tun)"))
return -1;
ifr.ifr_flags = IFF_NO_PI | (need_mac ? IFF_TAP : IFF_TUN);
strncpy(ifr.ifr_name, dev_name, IFNAMSIZ - 1);
ifr.ifr_name[IFNAMSIZ - 1] = '\0';
err = ioctl(fd, TUNSETIFF, &ifr);
if (!ASSERT_OK(err, "ioctl(TUNSETIFF)")) {
close(fd);
return -1;
}
err = fcntl(fd, F_SETFL, O_NONBLOCK);
if (!ASSERT_OK(err, "fcntl(O_NONBLOCK)")) {
close(fd);
return -1;
}
return fd;
}
#define ICMP_PAYLOAD_SIZE 100
/* Match an ICMP packet with payload len ICMP_PAYLOAD_SIZE */