mirror of
https://github.com/torvalds/linux.git
synced 2026-05-28 09:04:39 +02:00
selftest: tun: Add helpers for GSO over UDP tunnel
In preparation for testing GSO over UDP tunnels, enhance the test infrastructure to support a more complex data path involving a TUN device and a GENEVE udp tunnel. This patch introduces a dedicated setup/teardown topology that creates both a GENEVE tunnel interface and a TUN interface. The TUN device acts as the VTEP (Virtual Tunnel Endpoint), allowing it to send and receive virtio-net packets. This setup effectively tests the kernel's data path for encapsulated traffic. Note that after adding a new address to the UDP tunnel, we need to wait a bit until the associated route is available. Additionally, a new data structure is defined to manage test parameters. This structure is designed to be extensible, allowing different test data and configurations to be easily added in subsequent patches. Signed-off-by: Xu Du <xudu@redhat.com> Link: https://patch.msgid.link/b5787b8c269f43ce11e1756f1691cc7fd9a1e901.1768979440.git.xudu@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xu Du
Jakub Kicinski
parent
82cfdcfa20
commit
24e59f26ee
|
|
@ -15,6 +15,80 @@
|
|||
#include "kselftest_harness.h"
|
||||
#include "tuntap_helpers.h"
|
||||
|
||||
static const char param_dev_geneve_name[] = "geneve1";
|
||||
static unsigned char param_hwaddr_outer_dst[] = { 0x00, 0xfe, 0x98,
|
||||
0x14, 0x22, 0x42 };
|
||||
static unsigned char param_hwaddr_outer_src[] = { 0x00, 0xfe, 0x98,
|
||||
0x94, 0xd2, 0x43 };
|
||||
static unsigned char param_hwaddr_inner_dst[] = { 0x00, 0xfe, 0x98,
|
||||
0x94, 0x22, 0xcc };
|
||||
static unsigned char param_hwaddr_inner_src[] = { 0x00, 0xfe, 0x98,
|
||||
0x94, 0xd2, 0xdd };
|
||||
|
||||
static struct in_addr param_ipaddr4_outer_dst = {
|
||||
__constant_htonl(0xac100001),
|
||||
};
|
||||
|
||||
static struct in_addr param_ipaddr4_outer_src = {
|
||||
__constant_htonl(0xac100002),
|
||||
};
|
||||
|
||||
static struct in_addr param_ipaddr4_inner_dst = {
|
||||
__constant_htonl(0xac100101),
|
||||
};
|
||||
|
||||
static struct in_addr param_ipaddr4_inner_src = {
|
||||
__constant_htonl(0xac100102),
|
||||
};
|
||||
|
||||
static struct in6_addr param_ipaddr6_outer_dst = {
|
||||
{ { 0x20, 0x02, 0x0d, 0xb8, 0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 } },
|
||||
};
|
||||
|
||||
static struct in6_addr param_ipaddr6_outer_src = {
|
||||
{ { 0x20, 0x02, 0x0d, 0xb8, 0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2 } },
|
||||
};
|
||||
|
||||
static struct in6_addr param_ipaddr6_inner_dst = {
|
||||
{ { 0x20, 0x02, 0x0d, 0xb8, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 } },
|
||||
};
|
||||
|
||||
static struct in6_addr param_ipaddr6_inner_src = {
|
||||
{ { 0x20, 0x02, 0x0d, 0xb8, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2 } },
|
||||
};
|
||||
|
||||
#define VN_ID 1
|
||||
#define VN_PORT 4789
|
||||
#define UDP_SRC_PORT 22
|
||||
#define UDP_DST_PORT 48878
|
||||
#define IPPREFIX_LEN 24
|
||||
#define IP6PREFIX_LEN 64
|
||||
#define TIMEOUT_SEC 10
|
||||
#define TIMEOUT_USEC 100000
|
||||
#define MAX_RETRIES 20
|
||||
|
||||
#define UDP_TUNNEL_GENEVE_4IN4 0x01
|
||||
#define UDP_TUNNEL_GENEVE_6IN4 0x02
|
||||
#define UDP_TUNNEL_GENEVE_4IN6 0x04
|
||||
#define UDP_TUNNEL_GENEVE_6IN6 0x08
|
||||
|
||||
#define UDP_TUNNEL_OUTER_IPV4 (UDP_TUNNEL_GENEVE_4IN4 | UDP_TUNNEL_GENEVE_6IN4)
|
||||
#define UDP_TUNNEL_INNER_IPV4 (UDP_TUNNEL_GENEVE_4IN4 | UDP_TUNNEL_GENEVE_4IN6)
|
||||
|
||||
#define TUN_VNET_TNL_SIZE sizeof(struct virtio_net_hdr_v1_hash_tunnel)
|
||||
|
||||
struct geneve_setup_config {
|
||||
int family;
|
||||
union {
|
||||
struct in_addr r4;
|
||||
struct in6_addr r6;
|
||||
} remote;
|
||||
__be32 vnid;
|
||||
__be16 vnport;
|
||||
unsigned char hwaddr[6];
|
||||
uint8_t csum;
|
||||
};
|
||||
|
||||
static int tun_attach(int fd, char *dev)
|
||||
{
|
||||
struct ifreq ifr;
|
||||
|
|
@ -67,6 +141,202 @@ static int tun_delete(char *dev)
|
|||
return ip_link_del(dev);
|
||||
}
|
||||
|
||||
static int tun_open(char *dev, const int flags, const int hdrlen,
|
||||
const int features, const unsigned char *mac_addr)
|
||||
{
|
||||
struct ifreq ifr = { 0 };
|
||||
int fd, sk = -1;
|
||||
|
||||
fd = open("/dev/net/tun", O_RDWR);
|
||||
if (fd < 0) {
|
||||
perror("open");
|
||||
return -1;
|
||||
}
|
||||
|
||||
ifr.ifr_flags = flags;
|
||||
if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) {
|
||||
perror("ioctl(TUNSETIFF)");
|
||||
goto err;
|
||||
}
|
||||
strcpy(dev, ifr.ifr_name);
|
||||
|
||||
if (hdrlen > 0) {
|
||||
if (ioctl(fd, TUNSETVNETHDRSZ, &hdrlen) < 0) {
|
||||
perror("ioctl(TUNSETVNETHDRSZ)");
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
|
||||
if (features) {
|
||||
if (ioctl(fd, TUNSETOFFLOAD, features) < 0) {
|
||||
perror("ioctl(TUNSETOFFLOAD)");
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
|
||||
sk = socket(PF_INET, SOCK_DGRAM, 0);
|
||||
if (sk < 0) {
|
||||
perror("socket");
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (ioctl(sk, SIOCGIFFLAGS, &ifr) < 0) {
|
||||
perror("ioctl(SIOCGIFFLAGS)");
|
||||
goto err;
|
||||
}
|
||||
|
||||
ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
|
||||
if (ioctl(sk, SIOCSIFFLAGS, &ifr) < 0) {
|
||||
perror("ioctl(SIOCSIFFLAGS)");
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (mac_addr && flags & IFF_TAP) {
|
||||
ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
|
||||
memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, ETH_ALEN);
|
||||
|
||||
if (ioctl(sk, SIOCSIFHWADDR, &ifr) < 0) {
|
||||
perror("ioctl(SIOCSIFHWADDR)");
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
if (sk >= 0)
|
||||
close(sk);
|
||||
return fd;
|
||||
|
||||
err:
|
||||
close(fd);
|
||||
fd = -1;
|
||||
goto out;
|
||||
}
|
||||
|
||||
static size_t sockaddr_len(int family)
|
||||
{
|
||||
return (family == AF_INET) ? sizeof(struct sockaddr_in) :
|
||||
sizeof(struct sockaddr_in6);
|
||||
}
|
||||
|
||||
static int geneve_fill_newlink(struct rt_link_newlink_req *req, void *data)
|
||||
{
|
||||
struct geneve_setup_config *cfg = data;
|
||||
|
||||
#define SET_GENEVE_REMOTE rt_link_newlink_req_set_linkinfo_data_geneve_remote
|
||||
#define SET_GENEVE_REMOTE6 rt_link_newlink_req_set_linkinfo_data_geneve_remote6
|
||||
|
||||
rt_link_newlink_req_set_address(req, cfg->hwaddr, ETH_ALEN);
|
||||
rt_link_newlink_req_set_linkinfo_data_geneve_id(req, cfg->vnid);
|
||||
rt_link_newlink_req_set_linkinfo_data_geneve_port(req, cfg->vnport);
|
||||
rt_link_newlink_req_set_linkinfo_data_geneve_udp_csum(req, cfg->csum);
|
||||
|
||||
if (cfg->family == AF_INET)
|
||||
SET_GENEVE_REMOTE(req, cfg->remote.r4.s_addr);
|
||||
else
|
||||
SET_GENEVE_REMOTE6(req, &cfg->remote.r6,
|
||||
sizeof(cfg->remote.r6));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int geneve_create(const char *dev, int family, void *remote,
|
||||
void *hwaddr)
|
||||
{
|
||||
struct geneve_setup_config geneve;
|
||||
|
||||
memset(&geneve, 0, sizeof(geneve));
|
||||
geneve.vnid = VN_ID;
|
||||
geneve.vnport = htons(VN_PORT);
|
||||
geneve.csum = 1;
|
||||
geneve.family = family;
|
||||
if (family == AF_INET)
|
||||
memcpy(&geneve.remote.r4, remote, sizeof(struct in_addr));
|
||||
else
|
||||
memcpy(&geneve.remote.r6, remote, sizeof(struct in6_addr));
|
||||
memcpy(geneve.hwaddr, hwaddr, ETH_ALEN);
|
||||
|
||||
return ip_link_add(dev, "geneve", geneve_fill_newlink, (void *)&geneve);
|
||||
}
|
||||
|
||||
static int set_pmtu_discover(int fd, bool is_ipv4)
|
||||
{
|
||||
int level, name, val;
|
||||
|
||||
if (is_ipv4) {
|
||||
level = SOL_IP;
|
||||
name = IP_MTU_DISCOVER;
|
||||
val = IP_PMTUDISC_DO;
|
||||
} else {
|
||||
level = SOL_IPV6;
|
||||
name = IPV6_MTU_DISCOVER;
|
||||
val = IPV6_PMTUDISC_DO;
|
||||
}
|
||||
|
||||
return setsockopt(fd, level, name, &val, sizeof(val));
|
||||
}
|
||||
|
||||
static int udp_socket_open(struct sockaddr_storage *ssa, bool do_frag,
|
||||
bool do_connect, struct sockaddr_storage *dsa)
|
||||
{
|
||||
struct timeval to = { .tv_sec = TIMEOUT_SEC };
|
||||
int fd, family = ssa->ss_family;
|
||||
int salen = sockaddr_len(family);
|
||||
|
||||
fd = socket(family, SOCK_DGRAM, 0);
|
||||
if (fd < 0)
|
||||
return -1;
|
||||
|
||||
if (bind(fd, (struct sockaddr *)ssa, salen) < 0) {
|
||||
perror("bind");
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (do_connect && connect(fd, (struct sockaddr *)dsa, salen) < 0) {
|
||||
perror("connect");
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &to, sizeof(to)) < 0) {
|
||||
perror("setsockopt(SO_RCVTIMEO)");
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (!do_frag && set_pmtu_discover(fd, family == AF_INET) < 0) {
|
||||
perror("set_pmtu_discover");
|
||||
goto err;
|
||||
}
|
||||
return fd;
|
||||
|
||||
err:
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
static void parse_route_rsp(struct rt_route_getroute_rsp *rsp, void *rtm_type)
|
||||
{
|
||||
*(uint8_t *)rtm_type = rsp->_hdr.rtm_type;
|
||||
}
|
||||
|
||||
static int ip_route_check(const char *intf, int family, void *addr)
|
||||
{
|
||||
uint8_t rtm_type, table = RT_TABLE_LOCAL;
|
||||
int retries = MAX_RETRIES;
|
||||
|
||||
while (retries-- > 0) {
|
||||
if (ip_route_get(intf, family, table, addr, parse_route_rsp,
|
||||
&rtm_type) == 0 &&
|
||||
rtm_type == RTN_LOCAL)
|
||||
break;
|
||||
|
||||
usleep(TIMEOUT_USEC);
|
||||
}
|
||||
|
||||
if (retries < 0)
|
||||
return -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
FIXTURE(tun)
|
||||
{
|
||||
char ifname[IFNAMSIZ];
|
||||
|
|
@ -129,4 +399,159 @@ TEST_F(tun, reattach_close_delete)
|
|||
EXPECT_EQ(tun_delete(self->ifname), 0);
|
||||
}
|
||||
|
||||
FIXTURE(tun_vnet_udptnl)
|
||||
{
|
||||
char ifname[IFNAMSIZ];
|
||||
int fd, sock;
|
||||
};
|
||||
|
||||
FIXTURE_VARIANT(tun_vnet_udptnl)
|
||||
{
|
||||
int tunnel_type;
|
||||
bool is_tap;
|
||||
};
|
||||
|
||||
/* clang-format off */
|
||||
#define TUN_VNET_UDPTNL_VARIANT_ADD(type, desc) \
|
||||
FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##udptnl) { \
|
||||
.tunnel_type = type, \
|
||||
.is_tap = true, \
|
||||
}
|
||||
/* clang-format on */
|
||||
|
||||
TUN_VNET_UDPTNL_VARIANT_ADD(UDP_TUNNEL_GENEVE_4IN4, 4in4);
|
||||
TUN_VNET_UDPTNL_VARIANT_ADD(UDP_TUNNEL_GENEVE_6IN4, 6in4);
|
||||
TUN_VNET_UDPTNL_VARIANT_ADD(UDP_TUNNEL_GENEVE_4IN6, 4in6);
|
||||
TUN_VNET_UDPTNL_VARIANT_ADD(UDP_TUNNEL_GENEVE_6IN6, 6in6);
|
||||
|
||||
static void assign_ifaddr_vars(int family, int is_outer, void **srcip,
|
||||
void **dstip, void **srcmac, void **dstmac)
|
||||
{
|
||||
if (is_outer) {
|
||||
if (family == AF_INET) {
|
||||
*srcip = (void *)¶m_ipaddr4_outer_src;
|
||||
*dstip = (void *)¶m_ipaddr4_outer_dst;
|
||||
} else {
|
||||
*srcip = (void *)¶m_ipaddr6_outer_src;
|
||||
*dstip = (void *)¶m_ipaddr6_outer_dst;
|
||||
}
|
||||
*srcmac = param_hwaddr_outer_src;
|
||||
*dstmac = param_hwaddr_outer_dst;
|
||||
} else {
|
||||
if (family == AF_INET) {
|
||||
*srcip = (void *)¶m_ipaddr4_inner_src;
|
||||
*dstip = (void *)¶m_ipaddr4_inner_dst;
|
||||
} else {
|
||||
*srcip = (void *)¶m_ipaddr6_inner_src;
|
||||
*dstip = (void *)¶m_ipaddr6_inner_dst;
|
||||
}
|
||||
*srcmac = param_hwaddr_inner_src;
|
||||
*dstmac = param_hwaddr_inner_dst;
|
||||
}
|
||||
}
|
||||
|
||||
static void assign_sockaddr_vars(int family, int is_outer,
|
||||
struct sockaddr_storage *src,
|
||||
struct sockaddr_storage *dst)
|
||||
{
|
||||
src->ss_family = family;
|
||||
dst->ss_family = family;
|
||||
|
||||
if (family == AF_INET) {
|
||||
struct sockaddr_in *s4 = (struct sockaddr_in *)src;
|
||||
struct sockaddr_in *d4 = (struct sockaddr_in *)dst;
|
||||
|
||||
s4->sin_addr = is_outer ? param_ipaddr4_outer_src :
|
||||
param_ipaddr4_inner_src;
|
||||
d4->sin_addr = is_outer ? param_ipaddr4_outer_dst :
|
||||
param_ipaddr4_inner_dst;
|
||||
if (!is_outer) {
|
||||
s4->sin_port = htons(UDP_SRC_PORT);
|
||||
d4->sin_port = htons(UDP_DST_PORT);
|
||||
}
|
||||
} else {
|
||||
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)src;
|
||||
struct sockaddr_in6 *d6 = (struct sockaddr_in6 *)dst;
|
||||
|
||||
s6->sin6_addr = is_outer ? param_ipaddr6_outer_src :
|
||||
param_ipaddr6_inner_src;
|
||||
d6->sin6_addr = is_outer ? param_ipaddr6_outer_dst :
|
||||
param_ipaddr6_inner_dst;
|
||||
if (!is_outer) {
|
||||
s6->sin6_port = htons(UDP_SRC_PORT);
|
||||
d6->sin6_port = htons(UDP_DST_PORT);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
FIXTURE_SETUP(tun_vnet_udptnl)
|
||||
{
|
||||
int ret, family, prefix, flags, features;
|
||||
int tunnel_type = variant->tunnel_type;
|
||||
struct sockaddr_storage ssa, dsa;
|
||||
void *sip, *dip, *smac, *dmac;
|
||||
|
||||
flags = (variant->is_tap ? IFF_TAP : IFF_TUN) | IFF_VNET_HDR |
|
||||
IFF_MULTI_QUEUE | IFF_NO_PI;
|
||||
features = TUN_F_CSUM | TUN_F_UDP_TUNNEL_GSO |
|
||||
TUN_F_UDP_TUNNEL_GSO_CSUM | TUN_F_USO4 | TUN_F_USO6;
|
||||
self->fd = tun_open(self->ifname, flags, TUN_VNET_TNL_SIZE, features,
|
||||
param_hwaddr_outer_src);
|
||||
ASSERT_GE(self->fd, 0);
|
||||
|
||||
family = (tunnel_type & UDP_TUNNEL_OUTER_IPV4) ? AF_INET : AF_INET6;
|
||||
prefix = (family == AF_INET) ? IPPREFIX_LEN : IP6PREFIX_LEN;
|
||||
assign_ifaddr_vars(family, 1, &sip, &dip, &smac, &dmac);
|
||||
|
||||
ret = ip_addr_add(self->ifname, family, sip, prefix);
|
||||
ASSERT_EQ(ret, 0);
|
||||
ret = ip_neigh_add(self->ifname, family, dip, dmac);
|
||||
ASSERT_EQ(ret, 0);
|
||||
ret = ip_route_check(self->ifname, family, sip);
|
||||
ASSERT_EQ(ret, 0);
|
||||
|
||||
ret = geneve_create(param_dev_geneve_name, family, dip,
|
||||
param_hwaddr_inner_src);
|
||||
ASSERT_EQ(ret, 0);
|
||||
|
||||
family = (tunnel_type & UDP_TUNNEL_INNER_IPV4) ? AF_INET : AF_INET6;
|
||||
prefix = (family == AF_INET) ? IPPREFIX_LEN : IP6PREFIX_LEN;
|
||||
assign_ifaddr_vars(family, 0, &sip, &dip, &smac, &dmac);
|
||||
|
||||
ret = ip_addr_add(param_dev_geneve_name, family, sip, prefix);
|
||||
ASSERT_EQ(ret, 0);
|
||||
ret = ip_neigh_add(param_dev_geneve_name, family, dip, dmac);
|
||||
ASSERT_EQ(ret, 0);
|
||||
ret = ip_route_check(param_dev_geneve_name, family, sip);
|
||||
ASSERT_EQ(ret, 0);
|
||||
|
||||
assign_sockaddr_vars(family, 0, &ssa, &dsa);
|
||||
self->sock = udp_socket_open(&ssa, false, true, &dsa);
|
||||
ASSERT_GE(self->sock, 0);
|
||||
}
|
||||
|
||||
FIXTURE_TEARDOWN(tun_vnet_udptnl)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (self->sock != -1)
|
||||
close(self->sock);
|
||||
|
||||
ret = ip_link_del(param_dev_geneve_name);
|
||||
EXPECT_EQ(ret, 0);
|
||||
|
||||
ret = tun_delete(self->ifname);
|
||||
EXPECT_EQ(ret, 0);
|
||||
}
|
||||
|
||||
TEST_F(tun_vnet_udptnl, basic)
|
||||
{
|
||||
int ret;
|
||||
char cmd[256] = { 0 };
|
||||
|
||||
sprintf(cmd, "ip addr show %s > /dev/null 2>&1", param_dev_geneve_name);
|
||||
ret = system(cmd);
|
||||
ASSERT_EQ(ret, 0);
|
||||
}
|
||||
|
||||
TEST_HARNESS_MAIN
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user