tapv2: multiple improvements
- change interface naming scheme
- rework netlink code
- add option to set link address, namespace
Change-Id: Icf667babb3077a07617b0b87c45c957e345cb4d1
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vnet/devices/tap/cli.c b/src/vnet/devices/tap/cli.c
index f7fc1e6..c86995c 100644
--- a/src/vnet/devices/tap/cli.c
+++ b/src/vnet/devices/tap/cli.c
@@ -38,38 +38,47 @@
tap_create_if_args_t args = { 0 };
int ip_addr_set = 0;
- /* Get a line of input. */
- if (!unformat_user (input, unformat_line_input, line_input))
- return clib_error_return (0, "Missing name <interface>");
+ args.id = ~0;
- while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+ /* Get a line of input. */
+ if (unformat_user (input, unformat_line_input, line_input))
{
- if (unformat (line_input, "name %s", &args.name))
- ;
- else if (unformat (line_input, "host-ns %s", &args.host_namespace))
- ;
- else if (unformat (line_input, "host-bridge %s", &args.host_bridge))
- ;
- else if (unformat (line_input, "host-ip4-addr %U/%d",
- unformat_ip4_address, &args.host_ip4_addr,
- &args.host_ip4_prefix_len))
- ip_addr_set = 1;
- else if (unformat (line_input, "host-ip6-addr %U/%d",
- unformat_ip6_address, &args.host_ip6_addr,
- &args.host_ip6_prefix_len))
- ip_addr_set = 1;
- else if (unformat (line_input, "rx-ring-size %d", &args.rx_ring_sz))
- ;
- else if (unformat (line_input, "tx-ring-size %d", &args.tx_ring_sz))
- ;
- else if (unformat (line_input, "hw-addr %U",
- unformat_ethernet_address, args.hw_addr))
- args.hw_addr_set = 1;
- else
- return clib_error_return (0, "unknown input `%U'",
- format_unformat_error, input);
+
+ while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (line_input, "id %u", &args.id))
+ ;
+ else
+ if (unformat (line_input, "host-if-name %s", &args.host_if_name))
+ ;
+ else if (unformat (line_input, "host-ns %s", &args.host_namespace))
+ ;
+ else if (unformat (line_input, "host-mac-addr %U",
+ unformat_ethernet_address, args.host_mac_addr))
+ ;
+ else if (unformat (line_input, "host-bridge %s", &args.host_bridge))
+ ;
+ else if (unformat (line_input, "host-ip4-addr %U/%d",
+ unformat_ip4_address, &args.host_ip4_addr,
+ &args.host_ip4_prefix_len))
+ ip_addr_set = 1;
+ else if (unformat (line_input, "host-ip6-addr %U/%d",
+ unformat_ip6_address, &args.host_ip6_addr,
+ &args.host_ip6_prefix_len))
+ ip_addr_set = 1;
+ else if (unformat (line_input, "rx-ring-size %d", &args.rx_ring_sz))
+ ;
+ else if (unformat (line_input, "tx-ring-size %d", &args.tx_ring_sz))
+ ;
+ else if (unformat (line_input, "hw-addr %U",
+ unformat_ethernet_address, args.mac_addr))
+ args.mac_addr_set = 1;
+ else
+ return clib_error_return (0, "unknown input `%U'",
+ format_unformat_error, input);
+ }
+ unformat_free (line_input);
}
- unformat_free (line_input);
if (ip_addr_set && args.host_bridge)
return clib_error_return (0, "Please specify either host ip address or "
@@ -77,7 +86,7 @@
tap_create_if (vm, &args);
- vec_free (args.name);
+ vec_free (args.host_if_name);
vec_free (args.host_namespace);
vec_free (args.host_bridge);
@@ -88,10 +97,10 @@
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (tap_create_command, static) = {
.path = "create tap",
- .short_help = "create tap {name <if-name>} [hw-addr <mac-address>] "
+ .short_help = "create tap {id <if-id>} [hw-addr <mac-address>] "
"[rx-ring-size <size>] [tx-ring-size <size>] [host-ns <netns>] "
"[host-bridge <bridge-name>] [host-ip4-addr <ip4addr/mask>] "
- "[host-ip6-addr <ip6-addr]",
+ "[host-ip6-addr <ip6-addr] [host-if-name <name>]",
.function = tap_create_command_fn,
};
/* *INDENT-ON* */
@@ -209,8 +218,8 @@
vif = pool_elt_at_index (mm->interfaces, hi->dev_instance);
vlib_cli_output (vm, "interface %U", format_vnet_sw_if_index_name,
vnm, vif->sw_if_index);
- if (vif->name)
- vlib_cli_output (vm, " name \"%s\"", vif->name);
+ if (vif->host_if_name)
+ vlib_cli_output (vm, " name \"%s\"", vif->host_if_name);
if (vif->net_ns)
vlib_cli_output (vm, " host-ns \"%s\"", vif->net_ns);
vlib_cli_output (vm, " flags 0x%x", vif->flags);
diff --git a/src/vnet/devices/tap/tap.c b/src/vnet/devices/tap/tap.c
index b4004f7..f31548c 100644
--- a/src/vnet/devices/tap/tap.c
+++ b/src/vnet/devices/tap/tap.c
@@ -15,6 +15,7 @@
*------------------------------------------------------------------
*/
+#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
@@ -24,6 +25,7 @@
#include <linux/virtio_net.h>
#include <linux/vhost.h>
#include <sys/eventfd.h>
+#include <sched.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
@@ -37,6 +39,8 @@
#include <vnet/devices/virtio/virtio.h>
#include <vnet/devices/tap/tap.h>
+tap_main_t tap_main;
+
#define _IOCTL(fd,a,...) \
if (ioctl (fd, a, __VA_ARGS__) < 0) \
{ \
@@ -53,24 +57,79 @@
return 0;
}
+static int
+open_netns_fd (char *netns)
+{
+ u8 *s = 0;
+ int fd;
+
+ if (strncmp (netns, "pid:", 4) == 0)
+ s = format (0, "/proc/%u/ns/net%c", atoi (netns + 4), 0);
+ else if (netns[0] == '/')
+ s = format (0, "%s%c", netns, 0);
+ else
+ s = format (0, "/var/run/netns/%s%c", netns, 0);
+
+ fd = open ((char *) s, O_RDONLY);
+ vec_free (s);
+ return fd;
+}
+
+
void
tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
{
vnet_main_t *vnm = vnet_get_main ();
virtio_main_t *vim = &virtio_main;
+ tap_main_t *tm = &tap_main;
vnet_sw_interface_t *sw;
vnet_hw_interface_t *hw;
int i, fd = -1;
+ int old_netns_fd = -1;
struct ifreq ifr;
size_t hdrsz;
struct vhost_memory *vhost_mem = 0;
virtio_if_t *vif = 0;
clib_error_t *err = 0;
+ uword *p;
+
+ if (args->id != ~0)
+ {
+ p = hash_get (tm->dev_instance_by_interface_id, args->id);
+ if (p)
+ {
+ args->rv = VNET_API_ERROR_INVALID_INTERFACE;
+ args->error = clib_error_return (0, "interface already exists");
+ return;
+ }
+ }
+ else
+ {
+ int tries = 1000;
+ while (--tries)
+ {
+ args->id = tm->last_used_interface_id++;
+ p = hash_get (tm->dev_instance_by_interface_id, args->id);
+ if (!p)
+ break;
+ }
+
+ if (!tries)
+ {
+ args->rv = VNET_API_ERROR_UNSPECIFIED;
+ args->error =
+ clib_error_return (0, "cannot find free interface id");
+ return;
+ }
+ }
memset (&ifr, 0, sizeof (ifr));
pool_get (vim->interfaces, vif);
vif->dev_instance = vif - vim->interfaces;
vif->tap_fd = -1;
+ vif->id = args->id;
+
+ hash_set (tm->dev_instance_by_interface_id, vif->id, vif->dev_instance);
if ((vif->fd = open ("/dev/vhost-net", O_RDWR | O_NONBLOCK)) < 0)
{
@@ -119,10 +178,8 @@
}
ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR;
- strncpy (ifr.ifr_ifrn.ifrn_name, (char *) args->name, IF_NAMESIZE - 1);
_IOCTL (vif->tap_fd, TUNSETIFF, (void *) &ifr);
-
- vif->ifindex = if_nametoindex ((char *) args->name);
+ vif->ifindex = if_nametoindex (ifr.ifr_ifrn.ifrn_name);
unsigned int offload = 0;
hdrsz = sizeof (struct virtio_net_hdr_v1);
@@ -130,10 +187,61 @@
_IOCTL (vif->tap_fd, TUNSETVNETHDRSZ, &hdrsz);
_IOCTL (vif->fd, VHOST_SET_OWNER, 0);
- if (args->host_bridge)
+ /* if namespace is specified, all further netlink messages should be excuted
+ after we change our net namespace */
+ if (args->host_namespace)
{
- int master_ifindex = if_nametoindex ((char *) args->host_bridge);
- args->error = vnet_netlink_set_if_master (vif->ifindex, master_ifindex);
+ int fd;
+ old_netns_fd = open ("/proc/self/ns/net", O_RDONLY);
+ if ((fd = open_netns_fd ((char *) args->host_namespace)) == -1)
+ {
+ args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
+ args->error = clib_error_return_unix (0, "open_netns_fd '%s'",
+ args->host_namespace);
+ goto error;
+ }
+ args->error = vnet_netlink_set_link_netns (vif->ifindex, fd,
+ (char *) args->host_if_name);
+ if (args->error)
+ {
+ args->rv = VNET_API_ERROR_NETLINK_ERROR;
+ goto error;
+ }
+ if (setns (fd, CLONE_NEWNET) == -1)
+ {
+ args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
+ args->error = clib_error_return_unix (0, "setns '%s'",
+ args->host_namespace);
+ goto error;
+ }
+ close (fd);
+ if ((vif->ifindex = if_nametoindex ((char *) args->host_if_name)) == 0)
+ {
+ args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
+ args->error = clib_error_return_unix (0, "if_nametoindex '%s'",
+ args->host_if_name);
+ goto error;
+ }
+ }
+ else
+ {
+ if (args->host_if_name)
+ {
+ args->error = vnet_netlink_set_link_name (vif->ifindex,
+ (char *)
+ args->host_if_name);
+ if (args->error)
+ {
+ args->rv = VNET_API_ERROR_NETLINK_ERROR;
+ goto error;
+ }
+ }
+ }
+
+ if (!ethernet_mac_address_is_zero (args->host_mac_addr))
+ {
+ args->error = vnet_netlink_set_link_addr (vif->ifindex,
+ args->host_mac_addr);
if (args->error)
{
args->rv = VNET_API_ERROR_NETLINK_ERROR;
@@ -141,11 +249,10 @@
}
}
- if (args->host_namespace)
+ if (args->host_bridge)
{
- args->error = vnet_netlink_set_if_namespace (vif->ifindex,
- (char *)
- args->host_namespace);
+ args->error = vnet_netlink_set_link_master (vif->ifindex,
+ (char *) args->host_bridge);
if (args->error)
{
args->rv = VNET_API_ERROR_NETLINK_ERROR;
@@ -153,6 +260,7 @@
}
}
+
if (args->host_ip4_prefix_len)
{
args->error = vnet_netlink_add_ip4_addr (vif->ifindex,
@@ -177,6 +285,25 @@
}
}
+ args->error = vnet_netlink_set_link_state (vif->ifindex, 1 /* UP */ );
+ if (args->error)
+ {
+ args->rv = VNET_API_ERROR_NETLINK_ERROR;
+ goto error;
+ }
+
+ /* switch back to old net namespace */
+ if (args->host_namespace)
+ {
+ if (setns (old_netns_fd, CLONE_NEWNET) == -1)
+ {
+ args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
+ args->error = clib_error_return_unix (0, "setns '%s'",
+ args->host_namespace);
+ goto error;
+ }
+ }
+
/* Set vhost memory table */
i = sizeof (struct vhost_memory) + sizeof (struct vhost_memory_region);
vhost_mem = clib_mem_alloc (i);
@@ -197,33 +324,24 @@
goto error;
}
- /* set host side up */
- if ((fd = socket (AF_INET, SOCK_STREAM, 0)) > 0)
- {
- memset (&ifr, 0, sizeof (struct ifreq));
- strncpy (ifr.ifr_name, (char *) args->name, sizeof (ifr.ifr_name) - 1);
- _IOCTL (fd, SIOCGIFFLAGS, (void *) &ifr);
- ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
- _IOCTL (fd, SIOCSIFFLAGS, (void *) &ifr);
- }
-
- if (!args->hw_addr_set)
+ if (!args->mac_addr_set)
{
f64 now = vlib_time_now (vm);
u32 rnd;
rnd = (u32) (now * 1e6);
rnd = random_u32 (&rnd);
- memcpy (args->hw_addr + 2, &rnd, sizeof (rnd));
- args->hw_addr[0] = 2;
- args->hw_addr[1] = 0xfe;
+ memcpy (args->mac_addr + 2, &rnd, sizeof (rnd));
+ args->mac_addr[0] = 2;
+ args->mac_addr[1] = 0xfe;
}
- vif->name = args->name;
- args->name = 0;
+ vif->host_if_name = args->host_if_name;
+ args->host_if_name = 0;
vif->net_ns = args->host_namespace;
args->host_namespace = 0;
args->error = ethernet_register_interface (vnm, virtio_device_class.index,
- vif->dev_instance, args->hw_addr,
+ vif->dev_instance,
+ args->mac_addr,
&vif->hw_if_index,
virtio_eth_flag_change);
if (args->error)
@@ -276,6 +394,7 @@
{
vnet_main_t *vnm = vnet_get_main ();
virtio_main_t *mm = &virtio_main;
+ tap_main_t *tm = &tap_main;
int i;
virtio_if_t *vif;
vnet_hw_interface_t *hw;
@@ -301,6 +420,7 @@
vec_foreach_index (i, vif->vrings) virtio_vring_free (vif, i);
vec_free (vif->vrings);
+ hash_unset (tm->dev_instance_by_interface_id, vif->id);
memset (vif, 0, sizeof (*vif));
pool_put (mm->interfaces, vif);
@@ -337,7 +457,8 @@
static clib_error_t *
tap_init (vlib_main_t * vm)
{
-
+ tap_main_t *tm = &tap_main;
+ tm->dev_instance_by_interface_id = hash_create (0, sizeof (uword));
return 0;
}
diff --git a/src/vnet/devices/tap/tap.h b/src/vnet/devices/tap/tap.h
index 0e0f8cb..7d07ffb 100644
--- a/src/vnet/devices/tap/tap.h
+++ b/src/vnet/devices/tap/tap.h
@@ -24,12 +24,14 @@
typedef struct
{
- u8 *name;
- u8 hw_addr_set;
- u8 hw_addr[6];
+ u32 id;
+ u8 mac_addr_set;
+ u8 mac_addr[6];
u16 rx_ring_sz;
u16 tx_ring_sz;
u8 *host_namespace;
+ u8 *host_if_name;
+ u8 host_mac_addr[6];
u8 *host_bridge;
ip4_address_t host_ip4_addr;
u32 host_ip4_prefix_len;
@@ -48,6 +50,12 @@
u8 dev_name[64];
} tap_interface_details_t;
+typedef struct
+{
+ u32 last_used_interface_id;
+ uword *dev_instance_by_interface_id;
+} tap_main_t;
+
void tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args);
int tap_delete_if (vlib_main_t * vm, u32 sw_if_index);
int tap_dump_ifs (tap_interface_details_t ** out_tapids);
diff --git a/src/vnet/devices/tap/tapv2.api b/src/vnet/devices/tap/tapv2.api
index 0378860..a206269 100644
--- a/src/vnet/devices/tap/tapv2.api
+++ b/src/vnet/devices/tap/tapv2.api
@@ -24,11 +24,15 @@
/** \brief Initialize a new tap interface with the given paramters
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
+ @param id - interface id, 0xffff means auto
@param use_random_mac - let the system generate a unique mac address
- @param tap_name - name to associate with the new interface
@param mac_address - mac addr to assign to the interface if use_radom not set
@param tx_ring_sz - the number of entries of TX ring
@param rx_ring_sz - the number of entries of RX ring
+ @param host_mac_addr_set - host side interface mac address should be set
+ @param host_mac_addr - host side interface mac address
+ @param host_if_name_set - host side interface name should be set
+ @param host_if_name - host side interface name
@param host_namespace_set - host namespece should be set
@param host_namespace - host namespace to attach interface to
@param host_bridge_set - host bridge should be set
@@ -44,13 +48,17 @@
{
u32 client_index;
u32 context;
+ u32 id;
u8 use_random_mac;
- u8 tap_name[64];
u8 mac_address[6];
u16 tx_ring_sz; /* optional, default is 256 entries, must be power of 2 */
u16 rx_ring_sz; /* optional, default is 256 entries, must be power of 2 */
u8 host_namespace_set;
u8 host_namespace[64];
+ u8 host_mac_addr_set;
+ u8 host_mac_addr[6];
+ u8 host_if_name_set;
+ u8 host_if_name[64];
u8 host_bridge_set;
u8 host_bridge[64];
u8 host_ip4_addr_set;
diff --git a/src/vnet/devices/tap/tapv2_api.c b/src/vnet/devices/tap/tapv2_api.c
index 2b324d6..3cededb 100644
--- a/src/vnet/devices/tap/tapv2_api.c
+++ b/src/vnet/devices/tap/tapv2_api.c
@@ -59,16 +59,25 @@
memset (ap, 0, sizeof (*ap));
- ap->name = mp->tap_name;
+ ap->id = mp->id;
if (!mp->use_random_mac)
{
- clib_memcpy (ap->hw_addr, mp->mac_address, 6);
- ap->hw_addr_set = 1;
+ clib_memcpy (ap->mac_addr, mp->mac_address, 6);
+ ap->mac_addr_set = 1;
}
ap->rx_ring_sz = ntohs (mp->rx_ring_sz);
ap->tx_ring_sz = ntohs (mp->tx_ring_sz);
ap->sw_if_index = (u32) ~ 0;
+ if (mp->host_if_name_set)
+ ap->host_if_name = mp->host_if_name;
+
+ if (mp->host_mac_addr_set)
+ {
+ clib_memcpy (ap->host_mac_addr, mp->host_mac_addr, 6);
+ ap->mac_addr_set = 1;
+ }
+
if (mp->host_namespace_set)
ap->host_namespace = mp->host_namespace;