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lcpng_interface.c
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/*
* Copyright (c) 2020 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#include <fcntl.h>
#include <ctype.h>
#include <sys/socket.h>
#include <net/if.h>
#include <lcpng/lcpng_interface.h>
#include <netlink/route/link/vlan.h>
#include <linux/if_ether.h>
#include <vnet/plugin/plugin.h>
#include <vnet/plugin/plugin.h>
#include <vppinfra/linux/netns.h>
#include <vnet/ip/ip_punt_drop.h>
#include <vnet/fib/fib_table.h>
#include <vnet/adj/adj_mcast.h>
#include <vnet/udp/udp.h>
#include <vnet/tcp/tcp.h>
#include <vnet/devices/tap/tap.h>
#include <vnet/devices/virtio/virtio.h>
#include <vnet/devices/netlink.h>
#include <vlibapi/api_helper_macros.h>
#include <vnet/ipsec/ipsec_punt.h>
vlib_log_class_t lcp_itf_pair_logger;
/**
* Pool of LIP objects
*/
lcp_itf_pair_t *lcp_itf_pair_pool = NULL;
u32
lcp_itf_num_pairs (void)
{
return pool_elts (lcp_itf_pair_pool);
}
/**
* DBs of interface-pair objects:
* - key'd by VIF (linux ID)
* - key'd by VPP's physical interface
* - number of shared uses of VPP's tap/host interface
*/
static uword *lip_db_by_vif;
index_t *lip_db_by_phy;
u32 *lip_db_by_host;
/**
* vector of virtual function table
*/
static lcp_itf_pair_vft_t *lcp_itf_vfts = NULL;
void
lcp_itf_pair_register_vft (lcp_itf_pair_vft_t *lcp_itf_vft)
{
vec_add1 (lcp_itf_vfts, *lcp_itf_vft);
}
u8 *
format_lcp_itf_pair (u8 *s, va_list *args)
{
vnet_main_t *vnm = vnet_get_main ();
lcp_itf_pair_t *lip = va_arg (*args, lcp_itf_pair_t *);
vnet_sw_interface_t *swif_phy;
vnet_sw_interface_t *swif_host;
s = format (s, "itf-pair: [%d]", lip - lcp_itf_pair_pool);
swif_phy = vnet_get_sw_interface_or_null (vnm, lip->lip_phy_sw_if_index);
if (!swif_phy)
s = format (s, " <no-phy-if>");
else
s = format (s, " %U", format_vnet_sw_interface_name, vnm, swif_phy);
swif_host = vnet_get_sw_interface_or_null (vnm, lip->lip_host_sw_if_index);
if (!swif_host)
s = format (s, " <no-host-if>");
else
s = format (s, " %U", format_vnet_sw_interface_name, vnm, swif_host);
s = format (s, " %v %d type %s", lip->lip_host_name, lip->lip_vif_index,
(lip->lip_host_type == LCP_ITF_HOST_TAP) ? "tap" : "tun");
if (lip->lip_namespace)
s = format (s, " netns %v", lip->lip_namespace);
return s;
}
static walk_rc_t
lcp_itf_pair_walk_show_cb (index_t api, void *ctx)
{
vlib_main_t *vm;
lcp_itf_pair_t *lip;
lip = lcp_itf_pair_get (api);
if (!lip)
return WALK_STOP;
vm = vlib_get_main ();
vlib_cli_output (vm, "%U\n", format_lcp_itf_pair, lip);
return WALK_CONTINUE;
}
void
lcp_itf_pair_show (u32 phy_sw_if_index)
{
vlib_main_t *vm;
u8 *ns;
index_t api;
vm = vlib_get_main ();
ns = lcp_get_default_ns();
vlib_cli_output (vm, "lcp default netns %v\n", ns);
vlib_cli_output (vm, "lcp lcp-auto-subint %s\n",
lcp_auto_subint () ? "on" : "off");
vlib_cli_output (vm, "lcp lcp-sync %s\n", lcp_sync () ? "on" : "off");
if (phy_sw_if_index == ~0)
{
lcp_itf_pair_walk (lcp_itf_pair_walk_show_cb, 0);
}
else
{
api = lcp_itf_pair_find_by_phy (phy_sw_if_index);
if (api != INDEX_INVALID)
lcp_itf_pair_walk_show_cb (api, 0);
}
}
lcp_itf_pair_t *
lcp_itf_pair_get (u32 index)
{
if (!lcp_itf_pair_pool) return NULL;
if (index == INDEX_INVALID) return NULL;
return pool_elt_at_index (lcp_itf_pair_pool, index);
}
index_t
lcp_itf_pair_find_by_vif (u32 vif_index)
{
uword *p;
p = hash_get (lip_db_by_vif, vif_index);
if (p)
return p[0];
return INDEX_INVALID;
}
const char *lcp_itf_l3_feat_names[N_LCP_ITF_HOST][N_AF] = {
[LCP_ITF_HOST_TAP] =
{
[AF_IP4] = "linux-cp-xc-ip4",
[AF_IP6] = "linux-cp-xc-ip6",
},
[LCP_ITF_HOST_TUN] =
{
[AF_IP4] = "linux-cp-xc-l3-ip4",
[AF_IP6] = "linux-cp-xc-l3-ip6",
},
};
const fib_route_path_flags_t lcp_itf_route_path_flags[N_LCP_ITF_HOST] = {
[LCP_ITF_HOST_TAP] = FIB_ROUTE_PATH_DVR,
[LCP_ITF_HOST_TUN] = FIB_ROUTE_PATH_FLAG_NONE,
};
static void
lcp_itf_unset_adjs (lcp_itf_pair_t *lip)
{
adj_unlock (lip->lip_phy_adjs.adj_index[AF_IP4]);
adj_unlock (lip->lip_phy_adjs.adj_index[AF_IP6]);
}
static void
lcp_itf_set_adjs (lcp_itf_pair_t *lip)
{
if (lip->lip_host_type == LCP_ITF_HOST_TUN)
{
lip->lip_phy_adjs.adj_index[AF_IP4] = adj_nbr_add_or_lock (
FIB_PROTOCOL_IP4, VNET_LINK_IP4, &zero_addr, lip->lip_phy_sw_if_index);
lip->lip_phy_adjs.adj_index[AF_IP6] = adj_nbr_add_or_lock (
FIB_PROTOCOL_IP6, VNET_LINK_IP6, &zero_addr, lip->lip_phy_sw_if_index);
}
else
{
lip->lip_phy_adjs.adj_index[AF_IP4] = adj_mcast_add_or_lock (
FIB_PROTOCOL_IP4, VNET_LINK_IP4, lip->lip_phy_sw_if_index);
lip->lip_phy_adjs.adj_index[AF_IP6] = adj_mcast_add_or_lock (
FIB_PROTOCOL_IP6, VNET_LINK_IP6, lip->lip_phy_sw_if_index);
}
ip_adjacency_t *adj;
adj = adj_get (lip->lip_phy_adjs.adj_index[AF_IP4]);
lip->lip_rewrite_len = adj->rewrite_header.data_bytes;
}
int
lcp_itf_pair_add (u32 host_sw_if_index, u32 phy_sw_if_index, u8 *host_name,
u32 host_index, lip_host_type_t host_type, u8 *ns)
{
index_t lipi;
lcp_itf_pair_t *lip;
lipi = lcp_itf_pair_find_by_phy (phy_sw_if_index);
if (lipi != INDEX_INVALID)
return VNET_API_ERROR_VALUE_EXIST;
if (host_sw_if_index == ~0) {
LCP_ITF_PAIR_ERR ("pair_add: Cannot add LIP - invalid host");
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
}
if (phy_sw_if_index == ~0) {
LCP_ITF_PAIR_ERR ("pair_add: Cannot add LIP - invalid phy");
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
}
LCP_ITF_PAIR_NOTICE (
"pair_add: Adding LIP for host:%U phy:%U, host_if:%v vif:%d ns:%v",
format_vnet_sw_if_index_name, vnet_get_main (), host_sw_if_index,
format_vnet_sw_if_index_name, vnet_get_main (), phy_sw_if_index, host_name,
host_index, ns);
/*
* Create a new pair.
*/
pool_get (lcp_itf_pair_pool, lip);
lipi = lip - lcp_itf_pair_pool;
vec_validate_init_empty (lip_db_by_phy, phy_sw_if_index, INDEX_INVALID);
vec_validate_init_empty (lip_db_by_host, host_sw_if_index, INDEX_INVALID);
lip_db_by_phy[phy_sw_if_index] = lipi;
lip_db_by_host[host_sw_if_index] = lipi;
hash_set (lip_db_by_vif, host_index, lipi);
lip->lip_host_sw_if_index = host_sw_if_index;
lip->lip_phy_sw_if_index = phy_sw_if_index;
lip->lip_host_name = vec_dup (host_name);
lip->lip_host_type = host_type;
lip->lip_vif_index = host_index;
lip->lip_namespace = vec_dup (ns);
/*
* First use of this host interface.
* Enable the x-connect feature on the host to send
* all packets to the phy.
*/
ip_address_family_t af;
FOR_EACH_IP_ADDRESS_FAMILY (af)
ip_feature_enable_disable (af, N_SAFI, IP_FEATURE_INPUT,
lcp_itf_l3_feat_names[lip->lip_host_type][af],
lip->lip_host_sw_if_index, 1, NULL, 0);
/*
* Configure passive punt to the host interface.
*/
fib_route_path_t *rpaths = NULL, rpath = {
.frp_flags = lcp_itf_route_path_flags[lip->lip_host_type],
.frp_proto = DPO_PROTO_IP4,
.frp_sw_if_index = lip->lip_host_sw_if_index,
.frp_weight = 1,
.frp_fib_index = ~0,
};
vec_add1 (rpaths, rpath);
ip4_punt_redirect_add_paths (lip->lip_phy_sw_if_index, rpaths);
rpaths[0].frp_proto = DPO_PROTO_IP6;
ip6_punt_redirect_add_paths (lip->lip_phy_sw_if_index, rpaths);
vec_free (rpaths);
lcp_itf_set_adjs (lip);
/* enable ARP feature node for broadcast interfaces */
if (lip->lip_host_type != LCP_ITF_HOST_TUN)
{
vnet_feature_enable_disable("arp", "linux-cp-arp-phy",
lip->lip_phy_sw_if_index, 1, NULL, 0);
vnet_feature_enable_disable("arp", "linux-cp-arp-host",
lip->lip_host_sw_if_index, 1, NULL, 0);
}
else
{
vnet_feature_enable_disable("ip4-punt", "linux-cp-punt-l3", 0, 1, NULL,
0);
vnet_feature_enable_disable("ip6-punt", "linux-cp-punt-l3", 0, 1, NULL,
0);
}
/* invoke registered callbacks for pair addition */
lcp_itf_pair_vft_t *vft;
vec_foreach (vft, lcp_itf_vfts)
{
if (vft->pair_add_fn)
vft->pair_add_fn (lip);
}
/* set timestamp when pair entered service */
lip->lip_create_ts = vlib_time_now (vlib_get_main ());
return 0;
}
static clib_error_t *
lcp_netlink_add_link_vlan (int parent, u32 vlan, u16 proto, const char *name)
{
struct rtnl_link *link;
struct nl_sock *sk;
int err;
sk = nl_socket_alloc ();
if ((err = nl_connect (sk, NETLINK_ROUTE)) < 0) {
LCP_ITF_PAIR_ERR ("netlink_add_link_vlan: connect error: %s", nl_geterror(err));
return clib_error_return (NULL, "Unable to connect socket: %d", err);
}
link = rtnl_link_vlan_alloc ();
rtnl_link_set_link (link, parent);
rtnl_link_set_name (link, name);
rtnl_link_vlan_set_id (link, vlan);
rtnl_link_vlan_set_protocol (link, htons (proto));
if ((err = rtnl_link_add (sk, link, NLM_F_CREATE)) < 0) {
LCP_ITF_PAIR_ERR ("netlink_add_link_vlan: link add error: %s", nl_geterror(err));
return clib_error_return (NULL, "Unable to add link %s: %d", name, err);
}
rtnl_link_put (link);
nl_close (sk);
return NULL;
}
static clib_error_t *
lcp_netlink_del_link (const char *name)
{
struct rtnl_link *link;
struct nl_sock *sk;
int err;
sk = nl_socket_alloc ();
if ((err = nl_connect (sk, NETLINK_ROUTE)) < 0)
return clib_error_return (NULL, "Unable to connect socket: %d", err);
link = rtnl_link_alloc ();
rtnl_link_set_name (link, name);
if ((err = rtnl_link_delete (sk, link)) < 0)
return clib_error_return (NULL, "Unable to del link %s: %d", name, err);
rtnl_link_put (link);
nl_close (sk);
return NULL;
}
int
lcp_itf_pair_del (u32 phy_sw_if_index)
{
ip_address_family_t af;
lcp_itf_pair_t *lip;
u32 lipi;
lcp_itf_pair_vft_t *vft;
lipi = lcp_itf_pair_find_by_phy (phy_sw_if_index);
if (lipi == INDEX_INVALID)
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
lip = lcp_itf_pair_get (lipi);
LCP_ITF_PAIR_NOTICE (
"pair_del: host:%U phy:%U host_if:%v vif:%d ns:%v",
format_vnet_sw_if_index_name, vnet_get_main (), lip->lip_host_sw_if_index,
format_vnet_sw_if_index_name, vnet_get_main (), lip->lip_phy_sw_if_index,
lip->lip_host_name, lip->lip_vif_index, lip->lip_namespace);
/* invoke registered callbacks for pair deletion */
vec_foreach (vft, lcp_itf_vfts)
{
if (vft->pair_del_fn)
vft->pair_del_fn (lip);
}
FOR_EACH_IP_ADDRESS_FAMILY (af)
ip_feature_enable_disable (af, N_SAFI, IP_FEATURE_INPUT,
lcp_itf_l3_feat_names[lip->lip_host_type][af],
lip->lip_host_sw_if_index, 0, NULL, 0);
lcp_itf_unset_adjs (lip);
ip4_punt_redirect_del (lip->lip_phy_sw_if_index);
ip6_punt_redirect_del (lip->lip_phy_sw_if_index);
/* disable ARP feature node for broadcast interfaces */
if (lip->lip_host_type != LCP_ITF_HOST_TUN)
{
vnet_feature_enable_disable("arp", "linux-cp-arp-phy",
lip->lip_phy_sw_if_index, 0, NULL, 0);
vnet_feature_enable_disable("arp", "linux-cp-arp-host",
lip->lip_host_sw_if_index, 0, NULL, 0);
}
else
{
vnet_feature_enable_disable("ip4-punt", "linux-cp-punt-l3", 0, 0, NULL,
0);
vnet_feature_enable_disable("ip6-punt", "linux-cp-punt-l3", 0, 0, NULL,
0);
}
lip_db_by_phy[phy_sw_if_index] = INDEX_INVALID;
lip_db_by_host[lip->lip_host_sw_if_index] = INDEX_INVALID;
hash_unset (lip_db_by_vif, lip->lip_vif_index);
vec_free (lip->lip_host_name);
vec_free (lip->lip_namespace);
pool_put (lcp_itf_pair_pool, lip);
return 0;
}
static void
lcp_itf_pair_delete_by_index (index_t lipi)
{
u32 host_sw_if_index;
lcp_itf_pair_t *lip;
u8 *host_name = 0;
char *ns = 0;
lip = lcp_itf_pair_get (lipi);
host_name = vec_dup (lip->lip_host_name);
ns = strdup ((const char *) lip->lip_namespace);
host_sw_if_index = lip->lip_host_sw_if_index;
lcp_itf_pair_del (lip->lip_phy_sw_if_index);
if (vnet_sw_interface_is_sub (vnet_get_main (), host_sw_if_index))
{
int curr_ns_fd = -1;
int vif_ns_fd = -1;
if (ns)
{
curr_ns_fd = clib_netns_open (NULL /* self */);
vif_ns_fd = clib_netns_open ((u8 *) ns);
if (vif_ns_fd != -1)
clib_setns (vif_ns_fd);
}
lcp_netlink_del_link ((const char *) host_name);
if (vif_ns_fd != -1)
close (vif_ns_fd);
if (curr_ns_fd != -1)
{
clib_setns (curr_ns_fd);
close (curr_ns_fd);
}
vnet_delete_sub_interface (host_sw_if_index);
}
else
tap_delete_if (vlib_get_main (), host_sw_if_index);
vec_free (host_name);
free (ns);
}
int
lcp_itf_pair_delete (u32 phy_sw_if_index)
{
index_t lipi;
lipi = lcp_itf_pair_find_by_phy (phy_sw_if_index);
if (lipi == INDEX_INVALID)
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
lcp_itf_pair_delete_by_index (lipi);
return 0;
}
void
lcp_itf_pair_walk (lcp_itf_pair_walk_cb_t cb, void *ctx)
{
u32 api;
pool_foreach_index (api, lcp_itf_pair_pool)
{
if (!cb (api, ctx))
break;
};
}
static clib_error_t *
lcp_itf_pair_config (vlib_main_t *vm, unformat_input_t *input)
{
u8 *default_ns;
default_ns = NULL;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "default netns %v", &default_ns))
{
vec_add1 (default_ns, 0);
if (lcp_set_default_ns (default_ns) < 0)
{
return clib_error_return (
0, "linux-cp namespace must be less than %d characters",
LCP_NS_LEN);
}
}
else if (unformat (input, "lcp-auto-subint"))
lcp_set_auto_subint (1 /* is_auto */);
else if (unformat (input, "lcp-sync"))
lcp_set_sync (1 /* is_auto */);
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
vec_free (default_ns);
return NULL;
}
VLIB_EARLY_CONFIG_FUNCTION (lcp_itf_pair_config, "lcpng");
/*
* Returns 1 if the tap name is valid.
* Returns 0 if the tap name is invalid.
*/
static int
lcp_validate_if_name (u8 *name)
{
int len;
char *p;
p = (char *) name;
len = clib_strnlen (p, IFNAMSIZ);
if (len >= IFNAMSIZ)
return 0;
for (; *p; ++p)
{
if (isalnum (*p))
continue;
switch (*p)
{
case '-':
case '_':
case '%':
case '@':
case ':':
case '.':
continue;
}
return 0;
}
return 1;
}
void
lcp_itf_set_link_state (const lcp_itf_pair_t *lip, u8 state)
{
vnet_main_t *vnm = vnet_get_main ();
int curr_ns_fd, vif_ns_fd;
if (!lip) return;
curr_ns_fd = vif_ns_fd = -1;
if (lip->lip_namespace)
{
curr_ns_fd = clib_netns_open (NULL /* self */);
vif_ns_fd = clib_netns_open (lip->lip_namespace);
if (vif_ns_fd != -1)
clib_setns (vif_ns_fd);
}
/* Set the same link state on all three (TAP, sw, netlink)
*/
if (state)
{
vnet_sw_interface_admin_up (vnm, lip->lip_phy_sw_if_index);
}
else
{
vnet_sw_interface_admin_down (vnm, lip->lip_phy_sw_if_index);
}
vnet_netlink_set_link_state (lip->lip_vif_index, state);
if (vif_ns_fd != -1)
close (vif_ns_fd);
if (curr_ns_fd != -1)
{
clib_setns (curr_ns_fd);
close (curr_ns_fd);
}
return;
}
void
lcp_itf_set_interface_addr (const lcp_itf_pair_t *lip)
{
ip4_main_t *im4 = &ip4_main;
ip6_main_t *im6 = &ip6_main;
ip_lookup_main_t *lm4 = &im4->lookup_main;
ip_lookup_main_t *lm6 = &im6->lookup_main;
ip_interface_address_t *ia = 0;
int vif_ns_fd = -1;
int curr_ns_fd = -1;
if (!lip)
return;
if (lip->lip_namespace)
{
curr_ns_fd = clib_netns_open (NULL /* self */);
vif_ns_fd = clib_netns_open (lip->lip_namespace);
if (vif_ns_fd != -1)
clib_setns (vif_ns_fd);
}
/* Sync any IP4 addressing info into LCP */
foreach_ip_interface_address (
lm4, ia, lip->lip_phy_sw_if_index, 1 /* honor unnumbered */, ({
ip4_address_t *r4 = ip_interface_address_get_address (lm4, ia);
LCP_ITF_PAIR_NOTICE ("set_interface_addr: %U add ip4 %U/%d",
format_lcp_itf_pair, lip, format_ip4_address, r4,
ia->address_length);
vnet_netlink_add_ip4_addr (lip->lip_vif_index, r4, ia->address_length);
}));
/* Sync any IP6 addressing info into LCP */
foreach_ip_interface_address (
lm6, ia, lip->lip_phy_sw_if_index, 1 /* honor unnumbered */, ({
ip6_address_t *r6 = ip_interface_address_get_address (lm6, ia);
LCP_ITF_PAIR_NOTICE ("set_interface_addr: %U add ip6 %U/%d",
format_lcp_itf_pair, lip, format_ip6_address, r6,
ia->address_length);
vnet_netlink_add_ip6_addr (lip->lip_vif_index, r6, ia->address_length);
}));
if (vif_ns_fd != -1)
close (vif_ns_fd);
if (curr_ns_fd != -1)
{
clib_setns (curr_ns_fd);
close (curr_ns_fd);
}
}
typedef struct
{
u32 vlan;
bool dot1ad;
u32 matched_sw_if_index;
} lcp_itf_match_t;
static walk_rc_t
lcp_itf_pair_find_walk (vnet_main_t *vnm, u32 sw_if_index, void *arg)
{
lcp_itf_match_t *match = arg;
const vnet_sw_interface_t *sw;
sw = vnet_get_sw_interface (vnm, sw_if_index);
if (sw && (sw->sub.eth.inner_vlan_id == 0) &&
(sw->sub.eth.outer_vlan_id == match->vlan) &&
(sw->sub.eth.flags.dot1ad == match->dot1ad))
{
LCP_ITF_PAIR_DBG ("find_walk: found match outer %d dot1ad %d "
"inner-dot1q %d: interface %U",
sw->sub.eth.outer_vlan_id, sw->sub.eth.flags.dot1ad,
sw->sub.eth.inner_vlan_id,
format_vnet_sw_if_index_name, vnet_get_main (),
sw->sw_if_index);
match->matched_sw_if_index = sw->sw_if_index;
return WALK_STOP;
}
return WALK_CONTINUE;
}
/* Return the index of the sub-int on the phy that has the given vlan and
* proto.
*/
static index_t
lcp_itf_pair_find_by_outer_vlan (u32 sup_if_index, u16 vlan, bool dot1ad)
{
lcp_itf_match_t match;
const vnet_hw_interface_t *hw;
match.vlan = vlan;
match.dot1ad = dot1ad;
match.matched_sw_if_index = INDEX_INVALID;
hw = vnet_get_sup_hw_interface (vnet_get_main (), sup_if_index);
vnet_hw_interface_walk_sw (vnet_get_main (), hw->hw_if_index,
lcp_itf_pair_find_walk, &match);
if (match.matched_sw_if_index >= vec_len (lip_db_by_phy))
return INDEX_INVALID;
return lip_db_by_phy[match.matched_sw_if_index];
}
int
lcp_itf_pair_create (u32 phy_sw_if_index, u8 *host_if_name,
lip_host_type_t host_if_type, u8 *ns,
u32 *host_sw_if_indexp)
{
vlib_main_t *vm;
vnet_main_t *vnm;
u32 vif_index = 0, host_sw_if_index;
const vnet_sw_interface_t *sw;
const vnet_hw_interface_t *hw;
lcp_itf_pair_t *lip;
if (!vnet_sw_if_index_is_api_valid (phy_sw_if_index)) {
LCP_ITF_PAIR_ERR ("pair_create: invalid phy index %u", phy_sw_if_index);
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
}
if (!lcp_validate_if_name (host_if_name)) {
LCP_ITF_PAIR_ERR ("pair_create: invalid host-if-name '%s'", host_if_name);
return VNET_API_ERROR_INVALID_ARGUMENT;
}
vnm = vnet_get_main ();
sw = vnet_get_sw_interface (vnm, phy_sw_if_index);
hw = vnet_get_sup_hw_interface (vnm, phy_sw_if_index);
if (!sw && !hw) {
LCP_ITF_PAIR_ERR ("pair_create: invalid interface");
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
}
/*
* Use interface-specific netns if supplied.
* Otherwise, use netns if defined, otherwise use the OS default.
*/
if (ns == 0 || ns[0] == 0)
ns = lcp_get_default_ns();
/* sub interfaces do not need a tap created */
if (vnet_sw_interface_is_sub (vnm, phy_sw_if_index))
{
index_t parent_if_index;
int orig_ns_fd, vif_ns_fd;
clib_error_t *err;
u16 outer_vlan, inner_vlan;
u16 outer_proto, inner_proto;
u16 vlan, proto;
u32 parent_vif_index;
if (sw->type == VNET_SW_INTERFACE_TYPE_SUB && sw->sub.eth.flags.exact_match == 0) {
LCP_ITF_PAIR_ERR ("pair_create: can't create LCP for a sub-interface without exact-match set");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
outer_vlan = sw->sub.eth.outer_vlan_id;
inner_vlan = sw->sub.eth.inner_vlan_id;
outer_proto = inner_proto = ETH_P_8021Q;
if (1 == sw->sub.eth.flags.dot1ad) outer_proto = ETH_P_8021AD;
LCP_ITF_PAIR_INFO (
"pair_create: creating dot1%s %d inner-dot1q %d on %U",
sw->sub.eth.flags.dot1ad ? "ad" : "q", outer_vlan, inner_vlan,
format_vnet_sw_if_index_name, vnet_get_main (), hw->sw_if_index);
parent_if_index = lcp_itf_pair_find_by_phy (sw->sup_sw_if_index);
if (INDEX_INVALID == parent_if_index)
{
LCP_ITF_PAIR_ERR ("pair_create: can't find LCP for %U",
format_vnet_sw_if_index_name, vnet_get_main (),
sw->sup_sw_if_index);
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
}
lip = lcp_itf_pair_get (parent_if_index);
if (!lip)
{
LCP_ITF_PAIR_ERR ("pair_create: can't create LCP for a "
"sub-interface without an LCP on the parent");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
LCP_ITF_PAIR_DBG ("pair_create: parent %U", format_lcp_itf_pair, lip);
parent_vif_index = lip->lip_vif_index;
/*
* see if the requested host interface has already been created
*/
orig_ns_fd = vif_ns_fd = -1;
err = NULL;
if (ns && ns[0] != 0)
{
orig_ns_fd = clib_netns_open (NULL /* self */);
vif_ns_fd = clib_netns_open (ns);
if (orig_ns_fd == -1 || vif_ns_fd == -1)
goto socket_close;
clib_setns (vif_ns_fd);
}
vif_index = if_nametoindex ((const char *) host_if_name);
if (!vif_index)
{
/*
* no existing host interface, create it now
*/
/*
* Find the parent tap:
* - if this is an outer VLAN, find the pair from the parent phy
* - if this is an inner VLAN, find the pair from the outer sub-int,
* which must exist.
*/
if (inner_vlan)
{
index_t linux_parent_if_index;
const lcp_itf_pair_t *llip;
vlan = inner_vlan;
proto = inner_proto;
linux_parent_if_index = lcp_itf_pair_find_by_outer_vlan (
sw->sup_sw_if_index, sw->sub.eth.outer_vlan_id,
sw->sub.eth.flags.dot1ad);
if (INDEX_INVALID == linux_parent_if_index)
{
LCP_ITF_PAIR_ERR ("pair_create: can't find LCP for outer "
"vlan %d proto %s on %U",
outer_vlan,
outer_proto == ETH_P_8021AD ? "dot1ad" :
"dot1q",
format_vnet_sw_if_index_name,
vnet_get_main (), hw->sw_if_index);
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
}
llip = lcp_itf_pair_get (linux_parent_if_index);
if (!llip)
{
LCP_ITF_PAIR_ERR (
"pair_create: can't create LCP for a "
"sub-interface without a valid Linux parent");
return VNET_API_ERROR_INVALID_ARGUMENT;
}
LCP_ITF_PAIR_DBG ("pair_create: linux parent %U",
format_lcp_itf_pair, llip);
parent_vif_index = llip->lip_vif_index;
}
else
{
vlan = outer_vlan;
proto = outer_proto;
}
err = lcp_netlink_add_link_vlan (parent_vif_index, vlan, proto,
(const char *) host_if_name);
if (err != 0) {
LCP_ITF_PAIR_ERR ("pair_create: cannot create link outer(proto:0x%04x,vlan:%u).inner(proto:0x%04x,vlan:%u) name:'%s'",
outer_proto, outer_vlan, inner_proto, inner_vlan, host_if_name);
}
if (!err)
vif_index = if_nametoindex ((char *) host_if_name);
}
/*
* create a sub-interface on the tap
*/
if (!err &&
vnet_create_sub_interface (lip->lip_host_sw_if_index, sw->sub.id,
sw->sub.eth.raw_flags, inner_vlan,
outer_vlan, &host_sw_if_index))
{
LCP_ITF_PAIR_ERR (
"pair_create: failed to create tap subint: %d.%d on %U",
outer_vlan, inner_vlan, format_vnet_sw_if_index_name,
vnet_get_main (), lip->lip_host_sw_if_index);
err = clib_error_return (
0, "failed to create tap subint: %d.%d on %U", outer_vlan,
inner_vlan, format_vnet_sw_if_index_name, vnet_get_main (),
lip->lip_host_sw_if_index);
}
socket_close:
if (orig_ns_fd != -1)
{
clib_setns (orig_ns_fd);
close (orig_ns_fd);
}
if (vif_ns_fd != -1)
close (vif_ns_fd);
if (err)
return VNET_API_ERROR_INVALID_ARGUMENT;
}
else
{
tap_create_if_args_t args = {
.num_rx_queues = clib_max (1, vlib_num_workers ()),
.id = hw->hw_if_index,
.sw_if_index = ~0,
.rx_ring_sz = 256,
.tx_ring_sz = 256,
.host_if_name = host_if_name,
.host_namespace = 0,
};
ethernet_interface_t *ei;
if (host_if_type == LCP_ITF_HOST_TUN)
args.tap_flags |= TAP_FLAG_TUN;
else
{
ei = pool_elt_at_index (ethernet_main.interfaces, hw->hw_instance);
mac_address_copy (&args.host_mac_addr, &ei->address.mac);
}
if (sw->mtu[VNET_MTU_L3])
{
args.host_mtu_set = 1;
args.host_mtu_size = sw->mtu[VNET_MTU_L3];
}
if (ns && ns[0] != 0)
{
args.host_namespace = ns;
}
vm = vlib_get_main ();
tap_create_if (vm, &args);
if (args.rv < 0)
{
LCP_ITF_PAIR_ERR ("pair_create: could not create tap: retval:%d", args.rv);
return args.rv;
}
/*
* The TAP interface does copy forward the host MTU based on the VPP
* interface's L3 MTU, but it should also ensure that the VPP tap
* interface has an MTU that is greater-or-equal to those. Considering
* users can set the interfaces at runtime (set interface mtu packet ...)
* ensure that the tap MTU is large enough, taking the VPP interface L3
* if it's set, and otherwise a sensible default.
*/
if (sw->mtu[VNET_MTU_L3])
vnet_sw_interface_set_mtu (vnm, args.sw_if_index, sw->mtu[VNET_MTU_L3]);
else
vnet_sw_interface_set_mtu (vnm, args.sw_if_index, ETHERNET_MAX_PACKET_BYTES);
/* TODO(pim) - figure out why we cannot initalize the carrier. Ideally, once
* the first TAP is created, we copy forward the link-carrier from the hardware.
* However, this provokes a crash on interfaces which are carrier down.
*
* tap_set_carrier (args.sw_if_index, (hw->flags & VNET_HW_INTERFACE_FLAG_LINK_UP));