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vpp/src/plugins/vxlan/vxlan.c
T
Damjan Marion c3148b1be8 misc: remove GNU Indent directives 
Type: refactor
Change-Id: I5235bf3e9aff58af6ba2c14e8c6529c4fc9ec86c
Signed-off-by: Damjan Marion <damarion@cisco.com>
2024-03-12 19:29:56 +00:00

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/*
* Copyright (c) 2015 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.
*/
#include <vxlan/vxlan.h>
#include <vnet/ip/format.h>
#include <vnet/fib/fib_entry.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_entry_track.h>
#include <vnet/mfib/mfib_table.h>
#include <vnet/adj/adj_mcast.h>
#include <vnet/adj/rewrite.h>
#include <vnet/dpo/drop_dpo.h>
#include <vnet/interface.h>
#include <vnet/flow/flow.h>
#include <vnet/udp/udp_local.h>
#include <vlib/vlib.h>
/**
* @file
* @brief VXLAN.
*
* VXLAN provides the features needed to allow L2 bridge domains (BDs)
* to span multiple servers. This is done by building an L2 overlay on
* top of an L3 network underlay using VXLAN tunnels.
*
* This makes it possible for servers to be co-located in the same data
* center or be separated geographically as long as they are reachable
* through the underlay L3 network.
*
* You can refer to this kind of L2 overlay bridge domain as a VXLAN
* (Virtual eXtensible VLAN) segment.
*/
vxlan_main_t vxlan_main;
static u32
vxlan_eth_flag_change (vnet_main_t *vnm, vnet_hw_interface_t *hi, u32 flags)
{
/* nothing for now */
return 0;
}
static clib_error_t *
vxlan_eth_set_max_frame_size (vnet_main_t *vnm, vnet_hw_interface_t *hw,
u32 frame_size)
{
/* nothing for now */
return 0;
}
static u8 *
format_decap_next (u8 * s, va_list * args)
{
u32 next_index = va_arg (*args, u32);
if (next_index == VXLAN_INPUT_NEXT_DROP)
return format (s, "drop");
else
return format (s, "index %d", next_index);
return s;
}
u8 *
format_vxlan_tunnel (u8 * s, va_list * args)
{
vxlan_tunnel_t *t = va_arg (*args, vxlan_tunnel_t *);
s = format (s,
"[%d] instance %d src %U dst %U src_port %d dst_port %d vni %d "
"fib-idx %d sw-if-idx %d ",
t->dev_instance, t->user_instance, format_ip46_address, &t->src,
IP46_TYPE_ANY, format_ip46_address, &t->dst, IP46_TYPE_ANY,
t->src_port, t->dst_port, t->vni, t->encap_fib_index,
t->sw_if_index);
s = format (s, "encap-dpo-idx %d ", t->next_dpo.dpoi_index);
if (PREDICT_FALSE (t->decap_next_index != VXLAN_INPUT_NEXT_L2_INPUT))
s = format (s, "decap-next-%U ", format_decap_next, t->decap_next_index);
if (PREDICT_FALSE (ip46_address_is_multicast (&t->dst)))
s = format (s, "mcast-sw-if-idx %d ", t->mcast_sw_if_index);
if (t->flow_index != ~0)
s = format (s, "flow-index %d [%U]", t->flow_index,
format_flow_enabled_hw, t->flow_index);
return s;
}
static u8 *
format_vxlan_name (u8 * s, va_list * args)
{
u32 dev_instance = va_arg (*args, u32);
vxlan_main_t *vxm = &vxlan_main;
vxlan_tunnel_t *t;
if (dev_instance == ~0)
return format (s, "<cached-unused>");
if (dev_instance >= vec_len (vxm->tunnels))
return format (s, "<improperly-referenced>");
t = pool_elt_at_index (vxm->tunnels, dev_instance);
return format (s, "vxlan_tunnel%d", t->user_instance);
}
static clib_error_t *
vxlan_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
u32 hw_flags = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) ?
VNET_HW_INTERFACE_FLAG_LINK_UP : 0;
vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
return /* no error */ 0;
}
VNET_DEVICE_CLASS (vxlan_device_class, static) = {
.name = "VXLAN",
.format_device_name = format_vxlan_name,
.format_tx_trace = format_vxlan_encap_trace,
.admin_up_down_function = vxlan_interface_admin_up_down,
};
static u8 *
format_vxlan_header_with_length (u8 * s, va_list * args)
{
u32 dev_instance = va_arg (*args, u32);
s = format (s, "unimplemented dev %u", dev_instance);
return s;
}
VNET_HW_INTERFACE_CLASS (vxlan_hw_class) = {
.name = "VXLAN",
.format_header = format_vxlan_header_with_length,
.build_rewrite = default_build_rewrite,
};
static void
vxlan_tunnel_restack_dpo (vxlan_tunnel_t * t)
{
u8 is_ip4 = ip46_address_is_ip4 (&t->dst);
dpo_id_t dpo = DPO_INVALID;
fib_forward_chain_type_t forw_type = is_ip4 ?
FIB_FORW_CHAIN_TYPE_UNICAST_IP4 : FIB_FORW_CHAIN_TYPE_UNICAST_IP6;
fib_entry_contribute_forwarding (t->fib_entry_index, forw_type, &dpo);
/* vxlan uses the payload hash as the udp source port
* hence the packet's hash is unknown
* skip single bucket load balance dpo's */
while (DPO_LOAD_BALANCE == dpo.dpoi_type)
{
const load_balance_t *lb;
const dpo_id_t *choice;
lb = load_balance_get (dpo.dpoi_index);
if (lb->lb_n_buckets > 1)
break;
choice = load_balance_get_bucket_i (lb, 0);
if (DPO_RECEIVE == choice->dpoi_type)
dpo_copy (&dpo, drop_dpo_get (choice->dpoi_proto));
else
dpo_copy (&dpo, choice);
}
u32 encap_index = is_ip4 ?
vxlan4_encap_node.index : vxlan6_encap_node.index;
dpo_stack_from_node (encap_index, &t->next_dpo, &dpo);
dpo_reset (&dpo);
}
static vxlan_tunnel_t *
vxlan_tunnel_from_fib_node (fib_node_t * node)
{
ASSERT (FIB_NODE_TYPE_VXLAN_TUNNEL == node->fn_type);
return ((vxlan_tunnel_t *) (((char *) node) -
STRUCT_OFFSET_OF (vxlan_tunnel_t, node)));
}
/**
* Function definition to backwalk a FIB node -
* Here we will restack the new dpo of VXLAN DIP to encap node.
*/
static fib_node_back_walk_rc_t
vxlan_tunnel_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
{
vxlan_tunnel_restack_dpo (vxlan_tunnel_from_fib_node (node));
return (FIB_NODE_BACK_WALK_CONTINUE);
}
/**
* Function definition to get a FIB node from its index
*/
static fib_node_t *
vxlan_tunnel_fib_node_get (fib_node_index_t index)
{
vxlan_tunnel_t *t;
vxlan_main_t *vxm = &vxlan_main;
t = pool_elt_at_index (vxm->tunnels, index);
return (&t->node);
}
/**
* Function definition to inform the FIB node that its last lock has gone.
*/
static void
vxlan_tunnel_last_lock_gone (fib_node_t * node)
{
/*
* The VXLAN tunnel is a root of the graph. As such
* it never has children and thus is never locked.
*/
ASSERT (0);
}
/*
* Virtual function table registered by VXLAN tunnels
* for participation in the FIB object graph.
*/
const static fib_node_vft_t vxlan_vft = {
.fnv_get = vxlan_tunnel_fib_node_get,
.fnv_last_lock = vxlan_tunnel_last_lock_gone,
.fnv_back_walk = vxlan_tunnel_back_walk,
};
#define foreach_copy_field \
_ (vni) \
_ (mcast_sw_if_index) \
_ (encap_fib_index) \
_ (decap_next_index) \
_ (src) \
_ (dst) \
_ (src_port) \
_ (dst_port)
static void
vxlan_rewrite (vxlan_tunnel_t * t, bool is_ip6)
{
union
{
ip4_vxlan_header_t h4;
ip6_vxlan_header_t h6;
} h;
int len = is_ip6 ? sizeof h.h6 : sizeof h.h4;
udp_header_t *udp;
vxlan_header_t *vxlan;
/* Fixed portion of the (outer) ip header */
clib_memset (&h, 0, sizeof (h));
if (!is_ip6)
{
ip4_header_t *ip = &h.h4.ip4;
udp = &h.h4.udp, vxlan = &h.h4.vxlan;
ip->ip_version_and_header_length = 0x45;
ip->ttl = 254;
ip->protocol = IP_PROTOCOL_UDP;
ip->src_address = t->src.ip4;
ip->dst_address = t->dst.ip4;
/* we fix up the ip4 header length and checksum after-the-fact */
ip->checksum = ip4_header_checksum (ip);
}
else
{
ip6_header_t *ip = &h.h6.ip6;
udp = &h.h6.udp, vxlan = &h.h6.vxlan;
ip->ip_version_traffic_class_and_flow_label =
clib_host_to_net_u32 (6 << 28);
ip->hop_limit = 255;
ip->protocol = IP_PROTOCOL_UDP;
ip->src_address = t->src.ip6;
ip->dst_address = t->dst.ip6;
}
/* UDP header, randomize src port on something, maybe? */
udp->src_port = clib_host_to_net_u16 (t->src_port);
udp->dst_port = clib_host_to_net_u16 (t->dst_port);
/* VXLAN header */
vnet_set_vni_and_flags (vxlan, t->vni);
vnet_rewrite_set_data (*t, &h, len);
}
static bool
vxlan_decap_next_is_valid (vxlan_main_t * vxm, u32 is_ip6,
u32 decap_next_index)
{
vlib_main_t *vm = vxm->vlib_main;
u32 input_idx = (!is_ip6) ?
vxlan4_input_node.index : vxlan6_input_node.index;
vlib_node_runtime_t *r = vlib_node_get_runtime (vm, input_idx);
return decap_next_index < r->n_next_nodes;
}
typedef CLIB_PACKED(union
{
struct
{
fib_node_index_t mfib_entry_index;
adj_index_t mcast_adj_index;
};
u64 as_u64;
}) mcast_shared_t;
static inline mcast_shared_t
mcast_shared_get (ip46_address_t * ip)
{
ASSERT (ip46_address_is_multicast (ip));
uword *p = hash_get_mem (vxlan_main.mcast_shared, ip);
ALWAYS_ASSERT (p);
mcast_shared_t ret = {.as_u64 = *p };
return ret;
}
static inline void
mcast_shared_add (ip46_address_t * dst, fib_node_index_t mfei, adj_index_t ai)
{
mcast_shared_t new_ep = {
.mcast_adj_index = ai,
.mfib_entry_index = mfei,
};
hash_set_mem_alloc (&vxlan_main.mcast_shared, dst, new_ep.as_u64);
}
static inline void
mcast_shared_remove (ip46_address_t * dst)
{
mcast_shared_t ep = mcast_shared_get (dst);
adj_unlock (ep.mcast_adj_index);
mfib_table_entry_delete_index (ep.mfib_entry_index, MFIB_SOURCE_VXLAN);
hash_unset_mem_free (&vxlan_main.mcast_shared, dst);
}
int vnet_vxlan_add_del_tunnel
(vnet_vxlan_add_del_tunnel_args_t * a, u32 * sw_if_indexp)
{
vxlan_main_t *vxm = &vxlan_main;
vnet_main_t *vnm = vxm->vnet_main;
vxlan_decap_info_t *p;
u32 sw_if_index = ~0;
vxlan4_tunnel_key_t key4;
vxlan6_tunnel_key_t key6;
u32 is_ip6 = a->is_ip6;
vlib_main_t *vm = vlib_get_main ();
u8 hw_addr[6];
/* Set udp-ports */
if (a->src_port == 0)
a->src_port = is_ip6 ? UDP_DST_PORT_vxlan6 : UDP_DST_PORT_vxlan;
if (a->dst_port == 0)
a->dst_port = is_ip6 ? UDP_DST_PORT_vxlan6 : UDP_DST_PORT_vxlan;
int not_found;
if (!is_ip6)
{
/* ip4 mcast is indexed by mcast addr only */
key4.key[0] = ip46_address_is_multicast (&a->dst) ?
a->dst.ip4.as_u32 :
a->dst.ip4.as_u32 | (((u64) a->src.ip4.as_u32) << 32);
key4.key[1] = ((u64) clib_host_to_net_u16 (a->src_port) << 48) |
(((u64) a->encap_fib_index) << 32) |
clib_host_to_net_u32 (a->vni << 8);
not_found =
clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4);
p = (void *) &key4.value;
}
else
{
key6.key[0] = a->dst.ip6.as_u64[0];
key6.key[1] = a->dst.ip6.as_u64[1];
key6.key[2] = (((u64) clib_host_to_net_u16 (a->src_port) << 48) |
((u64) a->encap_fib_index) << 32) |
clib_host_to_net_u32 (a->vni << 8);
not_found =
clib_bihash_search_inline_24_8 (&vxm->vxlan6_tunnel_by_key, &key6);
p = (void *) &key6.value;
}
if (not_found)
p = 0;
if (a->is_add)
{
l2input_main_t *l2im = &l2input_main;
u32 dev_instance; /* real dev instance tunnel index */
u32 user_instance; /* request and actual instance number */
/* adding a tunnel: tunnel must not already exist */
if (p)
return VNET_API_ERROR_TUNNEL_EXIST;
/*if not set explicitly, default to l2 */
if (a->decap_next_index == ~0)
a->decap_next_index = VXLAN_INPUT_NEXT_L2_INPUT;
if (!vxlan_decap_next_is_valid (vxm, is_ip6, a->decap_next_index))
return VNET_API_ERROR_INVALID_DECAP_NEXT;
vxlan_tunnel_t *t;
pool_get_aligned (vxm->tunnels, t, CLIB_CACHE_LINE_BYTES);
clib_memset (t, 0, sizeof (*t));
dev_instance = t - vxm->tunnels;
/* copy from arg structure */
#define _(x) t->x = a->x;
foreach_copy_field;
#undef _
vxlan_rewrite (t, is_ip6);
/*
* Reconcile the real dev_instance and a possible requested instance.
*/
user_instance = a->instance;
if (user_instance == ~0)
user_instance = dev_instance;
if (hash_get (vxm->instance_used, user_instance))
{
pool_put (vxm->tunnels, t);
return VNET_API_ERROR_INSTANCE_IN_USE;
}
hash_set (vxm->instance_used, user_instance, 1);
t->dev_instance = dev_instance; /* actual */
t->user_instance = user_instance; /* name */
t->flow_index = ~0;
if (a->is_l3)
t->hw_if_index =
vnet_register_interface (vnm, vxlan_device_class.index, dev_instance,
vxlan_hw_class.index, dev_instance);
else
{
vnet_eth_interface_registration_t eir = {};
f64 now = vlib_time_now (vm);
u32 rnd;
rnd = (u32) (now * 1e6);
rnd = random_u32 (&rnd);
memcpy (hw_addr + 2, &rnd, sizeof (rnd));
hw_addr[0] = 2;
hw_addr[1] = 0xfe;
eir.dev_class_index = vxlan_device_class.index;
eir.dev_instance = dev_instance;
eir.address = hw_addr;
eir.cb.flag_change = vxlan_eth_flag_change;
eir.cb.set_max_frame_size = vxlan_eth_set_max_frame_size;
t->hw_if_index = vnet_eth_register_interface (vnm, &eir);
}
vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, t->hw_if_index);
/* Set vxlan tunnel output node */
u32 encap_index = !is_ip6 ?
vxlan4_encap_node.index : vxlan6_encap_node.index;
vnet_set_interface_output_node (vnm, t->hw_if_index, encap_index);
t->sw_if_index = sw_if_index = hi->sw_if_index;
/* copy the key */
int add_failed;
if (is_ip6)
{
key6.value = (u64) dev_instance;
add_failed = clib_bihash_add_del_24_8 (&vxm->vxlan6_tunnel_by_key,
&key6, 1 /*add */ );
}
else
{
vxlan_decap_info_t di = {.sw_if_index = t->sw_if_index, };
if (ip46_address_is_multicast (&t->dst))
di.local_ip = t->src.ip4;
else
di.next_index = t->decap_next_index;
key4.value = di.as_u64;
add_failed = clib_bihash_add_del_16_8 (&vxm->vxlan4_tunnel_by_key,
&key4, 1 /*add */ );
}
if (add_failed)
{
if (a->is_l3)
vnet_delete_hw_interface (vnm, t->hw_if_index);
else
ethernet_delete_interface (vnm, t->hw_if_index);
hash_unset (vxm->instance_used, t->user_instance);
pool_put (vxm->tunnels, t);
return VNET_API_ERROR_INVALID_REGISTRATION;
}
vec_validate_init_empty (vxm->tunnel_index_by_sw_if_index, sw_if_index,
~0);
vxm->tunnel_index_by_sw_if_index[sw_if_index] = dev_instance;
/* setup l2 input config with l2 feature and bd 0 to drop packet */
vec_validate (l2im->configs, sw_if_index);
l2im->configs[sw_if_index].feature_bitmap = L2INPUT_FEAT_DROP;
l2im->configs[sw_if_index].bd_index = 0;
vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
si->flags &= ~VNET_SW_INTERFACE_FLAG_HIDDEN;
vnet_sw_interface_set_flags (vnm, sw_if_index,
VNET_SW_INTERFACE_FLAG_ADMIN_UP);
fib_node_init (&t->node, FIB_NODE_TYPE_VXLAN_TUNNEL);
fib_prefix_t tun_dst_pfx;
vnet_flood_class_t flood_class = VNET_FLOOD_CLASS_TUNNEL_NORMAL;
fib_protocol_t fp = fib_ip_proto (is_ip6);
fib_prefix_from_ip46_addr (fp, &t->dst, &tun_dst_pfx);
if (!ip46_address_is_multicast (&t->dst))
{
/* Unicast tunnel -
* source the FIB entry for the tunnel's destination
* and become a child thereof. The tunnel will then get poked
* when the forwarding for the entry updates, and the tunnel can
* re-stack accordingly
*/
vtep_addr_ref (&vxm->vtep_table, t->encap_fib_index, &t->src);
t->fib_entry_index = fib_entry_track (t->encap_fib_index,
&tun_dst_pfx,
FIB_NODE_TYPE_VXLAN_TUNNEL,
dev_instance,
&t->sibling_index);
vxlan_tunnel_restack_dpo (t);
}
else
{
/* Multicast tunnel -
* as the same mcast group can be used for multiple mcast tunnels
* with different VNIs, create the output fib adjacency only if
* it does not already exist
*/
if (vtep_addr_ref (&vxm->vtep_table,
t->encap_fib_index, &t->dst) == 1)
{
fib_node_index_t mfei;
adj_index_t ai;
fib_route_path_t path = {
.frp_proto = fib_proto_to_dpo (fp),
.frp_addr = zero_addr,
.frp_sw_if_index = 0xffffffff,
.frp_fib_index = ~0,
.frp_weight = 1,
.frp_flags = FIB_ROUTE_PATH_LOCAL,
.frp_mitf_flags = MFIB_ITF_FLAG_FORWARD,
};
const mfib_prefix_t mpfx = {
.fp_proto = fp,
.fp_len = (is_ip6 ? 128 : 32),
.fp_grp_addr = tun_dst_pfx.fp_addr,
};
/*
* Setup the (*,G) to receive traffic on the mcast group
* - the forwarding interface is for-us
* - the accepting interface is that from the API
*/
mfib_table_entry_path_update (t->encap_fib_index, &mpfx,
MFIB_SOURCE_VXLAN,
MFIB_ENTRY_FLAG_NONE, &path);
path.frp_sw_if_index = a->mcast_sw_if_index;
path.frp_flags = FIB_ROUTE_PATH_FLAG_NONE;
path.frp_mitf_flags = MFIB_ITF_FLAG_ACCEPT;
mfei = mfib_table_entry_path_update (
t->encap_fib_index, &mpfx, MFIB_SOURCE_VXLAN,
MFIB_ENTRY_FLAG_NONE, &path);
/*
* Create the mcast adjacency to send traffic to the group
*/
ai = adj_mcast_add_or_lock (fp,
fib_proto_to_link (fp),
a->mcast_sw_if_index);
/*
* create a new end-point
*/
mcast_shared_add (&t->dst, mfei, ai);
}
dpo_id_t dpo = DPO_INVALID;
mcast_shared_t ep = mcast_shared_get (&t->dst);
/* Stack shared mcast dst mac addr rewrite on encap */
dpo_set (&dpo, DPO_ADJACENCY_MCAST,
fib_proto_to_dpo (fp), ep.mcast_adj_index);
dpo_stack_from_node (encap_index, &t->next_dpo, &dpo);
dpo_reset (&dpo);
flood_class = VNET_FLOOD_CLASS_TUNNEL_MASTER;
}
vnet_get_sw_interface (vnet_get_main (), sw_if_index)->flood_class =
flood_class;
}
else
{
/* deleting a tunnel: tunnel must exist */
if (!p)
return VNET_API_ERROR_NO_SUCH_ENTRY;
u32 instance = is_ip6 ? key6.value :
vxm->tunnel_index_by_sw_if_index[p->sw_if_index];
vxlan_tunnel_t *t = pool_elt_at_index (vxm->tunnels, instance);
sw_if_index = t->sw_if_index;
vnet_sw_interface_set_flags (vnm, sw_if_index, 0 /* down */ );
vxm->tunnel_index_by_sw_if_index[sw_if_index] = ~0;
if (!is_ip6)
clib_bihash_add_del_16_8 (&vxm->vxlan4_tunnel_by_key, &key4,
0 /*del */ );
else
clib_bihash_add_del_24_8 (&vxm->vxlan6_tunnel_by_key, &key6,
0 /*del */ );
if (!ip46_address_is_multicast (&t->dst))
{
if (t->flow_index != ~0)
vnet_flow_del (vnm, t->flow_index);
vtep_addr_unref (&vxm->vtep_table, t->encap_fib_index, &t->src);
fib_entry_untrack (t->fib_entry_index, t->sibling_index);
}
else if (vtep_addr_unref (&vxm->vtep_table,
t->encap_fib_index, &t->dst) == 0)
{
mcast_shared_remove (&t->dst);
}
vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, t->hw_if_index);
if (hw->dev_class_index == vxlan_device_class.index)
vnet_delete_hw_interface (vnm, t->hw_if_index);
else
ethernet_delete_interface (vnm, t->hw_if_index);
hash_unset (vxm->instance_used, t->user_instance);
fib_node_deinit (&t->node);
pool_put (vxm->tunnels, t);
}
if (sw_if_indexp)
*sw_if_indexp = sw_if_index;
if (a->is_add)
{
/* register udp ports */
if (!is_ip6 && !udp_is_valid_dst_port (a->src_port, 1))
udp_register_dst_port (vxm->vlib_main, a->src_port,
vxlan4_input_node.index, 1);
if (is_ip6 && !udp_is_valid_dst_port (a->src_port, 0))
udp_register_dst_port (vxm->vlib_main, a->src_port,
vxlan6_input_node.index, 0);
}
return 0;
}
static uword
get_decap_next_for_node (u32 node_index, u32 ipv4_set)
{
vxlan_main_t *vxm = &vxlan_main;
vlib_main_t *vm = vxm->vlib_main;
uword input_node = (ipv4_set) ? vxlan4_input_node.index :
vxlan6_input_node.index;
return vlib_node_add_next (vm, input_node, node_index);
}
static uword
unformat_decap_next (unformat_input_t * input, va_list * args)
{
u32 *result = va_arg (*args, u32 *);
u32 ipv4_set = va_arg (*args, int);
vxlan_main_t *vxm = &vxlan_main;
vlib_main_t *vm = vxm->vlib_main;
u32 node_index;
u32 tmp;
if (unformat (input, "l2"))
*result = VXLAN_INPUT_NEXT_L2_INPUT;
else if (unformat (input, "node %U", unformat_vlib_node, vm, &node_index))
*result = get_decap_next_for_node (node_index, ipv4_set);
else if (unformat (input, "%d", &tmp))
*result = tmp;
else
return 0;
return 1;
}
static clib_error_t *
vxlan_add_del_tunnel_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, *line_input = &_line_input;
ip46_address_t src = ip46_address_initializer, dst =
ip46_address_initializer;
u8 is_add = 1;
u8 src_set = 0;
u8 dst_set = 0;
u8 grp_set = 0;
u8 ipv4_set = 0;
u8 ipv6_set = 0;
u8 is_l3 = 0;
u32 instance = ~0;
u32 encap_fib_index = 0;
u32 mcast_sw_if_index = ~0;
u32 decap_next_index = VXLAN_INPUT_NEXT_L2_INPUT;
u32 vni = 0;
u32 src_port = 0;
u32 dst_port = 0;
u32 table_id;
clib_error_t *parse_error = NULL;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "del"))
{
is_add = 0;
}
else if (unformat (line_input, "instance %d", &instance))
;
else if (unformat (line_input, "src %U",
unformat_ip46_address, &src, IP46_TYPE_ANY))
{
src_set = 1;
ip46_address_is_ip4 (&src) ? (ipv4_set = 1) : (ipv6_set = 1);
}
else if (unformat (line_input, "dst %U",
unformat_ip46_address, &dst, IP46_TYPE_ANY))
{
dst_set = 1;
ip46_address_is_ip4 (&dst) ? (ipv4_set = 1) : (ipv6_set = 1);
}
else if (unformat (line_input, "group %U %U",
unformat_ip46_address, &dst, IP46_TYPE_ANY,
unformat_vnet_sw_interface,
vnet_get_main (), &mcast_sw_if_index))
{
grp_set = dst_set = 1;
ip46_address_is_ip4 (&dst) ? (ipv4_set = 1) : (ipv6_set = 1);
}
else if (unformat (line_input, "encap-vrf-id %d", &table_id))
{
encap_fib_index =
fib_table_find (fib_ip_proto (ipv6_set), table_id);
}
else if (unformat (line_input, "l3"))
is_l3 = 1;
else if (unformat (line_input, "decap-next %U", unformat_decap_next,
&decap_next_index, ipv4_set))
;
else if (unformat (line_input, "vni %d", &vni))
;
else if (unformat (line_input, "src_port %d", &src_port))
;
else if (unformat (line_input, "dst_port %d", &dst_port))
;
else
{
parse_error = clib_error_return (0, "parse error: '%U'",
format_unformat_error, line_input);
break;
}
}
unformat_free (line_input);
if (parse_error)
return parse_error;
if (is_l3 && decap_next_index == VXLAN_INPUT_NEXT_L2_INPUT)
{
vlib_node_t *node = vlib_get_node_by_name (
vm, (u8 *) (ipv4_set ? "ip4-input" : "ip6-input"));
decap_next_index = get_decap_next_for_node (node->index, ipv4_set);
}
if (encap_fib_index == ~0)
return clib_error_return (0, "nonexistent encap-vrf-id %d", table_id);
if (src_set == 0)
return clib_error_return (0, "tunnel src address not specified");
if (dst_set == 0)
return clib_error_return (0, "tunnel dst address not specified");
if (grp_set && !ip46_address_is_multicast (&dst))
return clib_error_return (0, "tunnel group address not multicast");
if (grp_set == 0 && ip46_address_is_multicast (&dst))
return clib_error_return (0, "dst address must be unicast");
if (grp_set && mcast_sw_if_index == ~0)
return clib_error_return (0, "tunnel nonexistent multicast device");
if (ipv4_set && ipv6_set)
return clib_error_return (0, "both IPv4 and IPv6 addresses specified");
if (ip46_address_cmp (&src, &dst) == 0)
return clib_error_return (0, "src and dst addresses are identical");
if (decap_next_index == ~0)
return clib_error_return (0, "next node not found");
if (vni == 0)
return clib_error_return (0, "vni not specified");
if (vni >> 24)
return clib_error_return (0, "vni %d out of range", vni);
vnet_vxlan_add_del_tunnel_args_t a = { .is_add = is_add,
.is_ip6 = ipv6_set,
.is_l3 = is_l3,
.instance = instance,
#define _(x) .x = x,
foreach_copy_field
#undef _
};
u32 tunnel_sw_if_index;
int rv = vnet_vxlan_add_del_tunnel (&a, &tunnel_sw_if_index);
switch (rv)
{
case 0:
if (is_add)
vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name,
vnet_get_main (), tunnel_sw_if_index);
break;
case VNET_API_ERROR_TUNNEL_EXIST:
return clib_error_return (0, "tunnel already exists...");
case VNET_API_ERROR_NO_SUCH_ENTRY:
return clib_error_return (0, "tunnel does not exist...");
case VNET_API_ERROR_INSTANCE_IN_USE:
return clib_error_return (0, "Instance is in use");
default:
return clib_error_return
(0, "vnet_vxlan_add_del_tunnel returned %d", rv);
}
return 0;
}
/*?
* Add or delete a VXLAN Tunnel.
*
* VXLAN provides the features needed to allow L2 bridge domains (BDs)
* to span multiple servers. This is done by building an L2 overlay on
* top of an L3 network underlay using VXLAN tunnels.
*
* This makes it possible for servers to be co-located in the same data
* center or be separated geographically as long as they are reachable
* through the underlay L3 network.
*
* You can refer to this kind of L2 overlay bridge domain as a VXLAN
* (Virtual eXtensible VLAN) segment.
*
* @cliexpar
* Example of how to create a VXLAN Tunnel:
* @cliexcmd{create vxlan tunnel src 10.0.3.1 dst 10.0.3.3 vni 13 encap-vrf-id
7}
* Example of how to create a VXLAN Tunnel with a known name, vxlan_tunnel42:
* @cliexcmd{create vxlan tunnel src 10.0.3.1 dst 10.0.3.3 instance 42}
* Example of how to create a multicast VXLAN Tunnel with a known name,
vxlan_tunnel23:
* @cliexcmd{create vxlan tunnel src 10.0.3.1 group 239.1.1.1
GigabitEthernet0/8/0 instance 23}
* Example of how to create a VXLAN Tunnel with custom udp-ports:
* @cliexcmd{create vxlan tunnel src 10.0.3.1 dst 10.0.3.3 vni 13 src_port
59000 dst_port 59001}
* Example of how to delete a VXLAN Tunnel:
* @cliexcmd{create vxlan tunnel src 10.0.3.1 dst 10.0.3.3 vni 13 del}
?*/
VLIB_CLI_COMMAND (create_vxlan_tunnel_command, static) = {
.path = "create vxlan tunnel",
.short_help =
"create vxlan tunnel src <local-vtep-addr>"
" {dst <remote-vtep-addr>|group <mcast-vtep-addr> <intf-name>} vni <nn>"
" [instance <id>]"
" [encap-vrf-id <nn>] [decap-next [l2|node <name>]] [del] [l3]"
" [src_port <local-vtep-udp-port>] [dst_port <remote-vtep-udp-port>]",
.function = vxlan_add_del_tunnel_command_fn,
};
static clib_error_t *
show_vxlan_tunnel_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
vxlan_main_t *vxm = &vxlan_main;
vxlan_tunnel_t *t;
int raw = 0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "raw"))
raw = 1;
else
return clib_error_return (0, "parse error: '%U'",
format_unformat_error, input);
}
if (pool_elts (vxm->tunnels) == 0)
vlib_cli_output (vm, "No vxlan tunnels configured...");
pool_foreach (t, vxm->tunnels)
{
vlib_cli_output (vm, "%U", format_vxlan_tunnel, t);
}
if (raw)
{
vlib_cli_output (vm, "Raw IPv4 Hash Table:\n%U\n",
format_bihash_16_8, &vxm->vxlan4_tunnel_by_key,
1 /* verbose */ );
vlib_cli_output (vm, "Raw IPv6 Hash Table:\n%U\n",
format_bihash_24_8, &vxm->vxlan6_tunnel_by_key,
1 /* verbose */ );
}
return 0;
}
/*?
* Display all the VXLAN Tunnel entries.
*
* @cliexpar
* Example of how to display the VXLAN Tunnel entries:
* @cliexstart{show vxlan tunnel}
* [0] src 10.0.3.1 dst 10.0.3.3 src_port 4789 dst_port 4789 vni 13
encap_fib_index 0 sw_if_index 5 decap_next l2
* @cliexend
?*/
VLIB_CLI_COMMAND (show_vxlan_tunnel_command, static) = {
.path = "show vxlan tunnel",
.short_help = "show vxlan tunnel [raw]",
.function = show_vxlan_tunnel_command_fn,
};
void
vnet_int_vxlan_bypass_mode (u32 sw_if_index, u8 is_ip6, u8 is_enable)
{
vxlan_main_t *vxm = &vxlan_main;
if (pool_is_free_index (vxm->vnet_main->interface_main.sw_interfaces,
sw_if_index))
return;
is_enable = ! !is_enable;
if (is_ip6)
{
if (clib_bitmap_get (vxm->bm_ip6_bypass_enabled_by_sw_if, sw_if_index)
!= is_enable)
{
vnet_feature_enable_disable ("ip6-unicast", "ip6-vxlan-bypass",
sw_if_index, is_enable, 0, 0);
vxm->bm_ip6_bypass_enabled_by_sw_if =
clib_bitmap_set (vxm->bm_ip6_bypass_enabled_by_sw_if,
sw_if_index, is_enable);
}
}
else
{
if (clib_bitmap_get (vxm->bm_ip4_bypass_enabled_by_sw_if, sw_if_index)
!= is_enable)
{
vnet_feature_enable_disable ("ip4-unicast", "ip4-vxlan-bypass",
sw_if_index, is_enable, 0, 0);
vxm->bm_ip4_bypass_enabled_by_sw_if =
clib_bitmap_set (vxm->bm_ip4_bypass_enabled_by_sw_if,
sw_if_index, is_enable);
}
}
}
static clib_error_t *
set_ip_vxlan_bypass (u32 is_ip6,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, *line_input = &_line_input;
vnet_main_t *vnm = vnet_get_main ();
clib_error_t *error = 0;
u32 sw_if_index, is_enable;
sw_if_index = ~0;
is_enable = 1;
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat_user
(line_input, unformat_vnet_sw_interface, vnm, &sw_if_index))
;
else if (unformat (line_input, "del"))
is_enable = 0;
else
{
error = unformat_parse_error (line_input);
goto done;
}
}
if (~0 == sw_if_index)
{
error = clib_error_return (0, "unknown interface `%U'",
format_unformat_error, line_input);
goto done;
}
vnet_int_vxlan_bypass_mode (sw_if_index, is_ip6, is_enable);
done:
unformat_free (line_input);
return error;
}
static clib_error_t *
set_ip4_vxlan_bypass (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
return set_ip_vxlan_bypass (0, input, cmd);
}
/*?
* This command adds the 'ip4-vxlan-bypass' graph node for a given interface.
* By adding the IPv4 vxlan-bypass graph node to an interface, the node checks
* for and validate input vxlan packet and bypass ip4-lookup, ip4-local,
* ip4-udp-lookup nodes to speedup vxlan packet forwarding. This node will
* cause extra overhead to for non-vxlan packets which is kept at a minimum.
*
* @cliexpar
* @parblock
* Example of graph node before ip4-vxlan-bypass is enabled:
* @cliexstart{show vlib graph ip4-vxlan-bypass}
* Name Next Previous
* ip4-vxlan-bypass error-drop [0]
* vxlan4-input [1]
* ip4-lookup [2]
* @cliexend
*
* Example of how to enable ip4-vxlan-bypass on an interface:
* @cliexcmd{set interface ip vxlan-bypass GigabitEthernet2/0/0}
*
* Example of graph node after ip4-vxlan-bypass is enabled:
* @cliexstart{show vlib graph ip4-vxlan-bypass}
* Name Next Previous
* ip4-vxlan-bypass error-drop [0] ip4-input
* vxlan4-input [1] ip4-input-no-checksum
* ip4-lookup [2]
* @cliexend
*
* Example of how to display the feature enabled on an interface:
* @cliexstart{show ip interface features GigabitEthernet2/0/0}
* IP feature paths configured on GigabitEthernet2/0/0...
* ...
* ipv4 unicast:
* ip4-vxlan-bypass
* ip4-lookup
* ...
* @cliexend
*
* Example of how to disable ip4-vxlan-bypass on an interface:
* @cliexcmd{set interface ip vxlan-bypass GigabitEthernet2/0/0 del}
* @endparblock
?*/
VLIB_CLI_COMMAND (set_interface_ip_vxlan_bypass_command, static) = {
.path = "set interface ip vxlan-bypass",
.function = set_ip4_vxlan_bypass,
.short_help = "set interface ip vxlan-bypass <interface> [del]",
};
static clib_error_t *
set_ip6_vxlan_bypass (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
return set_ip_vxlan_bypass (1, input, cmd);
}
/*?
* This command adds the 'ip6-vxlan-bypass' graph node for a given interface.
* By adding the IPv6 vxlan-bypass graph node to an interface, the node checks
* for and validate input vxlan packet and bypass ip6-lookup, ip6-local,
* ip6-udp-lookup nodes to speedup vxlan packet forwarding. This node will
* cause extra overhead to for non-vxlan packets which is kept at a minimum.
*
* @cliexpar
* @parblock
* Example of graph node before ip6-vxlan-bypass is enabled:
* @cliexstart{show vlib graph ip6-vxlan-bypass}
* Name Next Previous
* ip6-vxlan-bypass error-drop [0]
* vxlan6-input [1]
* ip6-lookup [2]
* @cliexend
*
* Example of how to enable ip6-vxlan-bypass on an interface:
* @cliexcmd{set interface ip6 vxlan-bypass GigabitEthernet2/0/0}
*
* Example of graph node after ip6-vxlan-bypass is enabled:
* @cliexstart{show vlib graph ip6-vxlan-bypass}
* Name Next Previous
* ip6-vxlan-bypass error-drop [0] ip6-input
* vxlan6-input [1] ip4-input-no-checksum
* ip6-lookup [2]
* @cliexend
*
* Example of how to display the feature enabled on an interface:
* @cliexstart{show ip interface features GigabitEthernet2/0/0}
* IP feature paths configured on GigabitEthernet2/0/0...
* ...
* ipv6 unicast:
* ip6-vxlan-bypass
* ip6-lookup
* ...
* @cliexend
*
* Example of how to disable ip6-vxlan-bypass on an interface:
* @cliexcmd{set interface ip6 vxlan-bypass GigabitEthernet2/0/0 del}
* @endparblock
?*/
VLIB_CLI_COMMAND (set_interface_ip6_vxlan_bypass_command, static) = {
.path = "set interface ip6 vxlan-bypass",
.function = set_ip6_vxlan_bypass,
.short_help = "set interface ip6 vxlan-bypass <interface> [del]",
};
int
vnet_vxlan_add_del_rx_flow (u32 hw_if_index, u32 t_index, int is_add)
{
vxlan_main_t *vxm = &vxlan_main;
vxlan_tunnel_t *t = pool_elt_at_index (vxm->tunnels, t_index);
vnet_main_t *vnm = vnet_get_main ();
if (is_add)
{
if (t->flow_index == ~0)
{
vxlan_main_t *vxm = &vxlan_main;
vnet_flow_t flow = {
.actions =
VNET_FLOW_ACTION_REDIRECT_TO_NODE | VNET_FLOW_ACTION_MARK |
VNET_FLOW_ACTION_BUFFER_ADVANCE,
.mark_flow_id = t->dev_instance + vxm->flow_id_start,
.redirect_node_index = vxlan4_flow_input_node.index,
.buffer_advance = sizeof (ethernet_header_t),
.type = VNET_FLOW_TYPE_IP4_VXLAN,
.ip4_vxlan = {
.protocol.prot = IP_PROTOCOL_UDP,
.src_addr.addr = t->dst.ip4,
.dst_addr.addr = t->src.ip4,
.src_addr.mask.as_u32 = ~0,
.dst_addr.mask.as_u32 = ~0,
.dst_port.port = t->src_port,
.dst_port.mask = 0xFF,
.vni = t->vni,
}
,
};
vnet_flow_add (vnm, &flow, &t->flow_index);
}
return vnet_flow_enable (vnm, t->flow_index, hw_if_index);
}
/* flow index is removed when the tunnel is deleted */
return vnet_flow_disable (vnm, t->flow_index, hw_if_index);
}
u32
vnet_vxlan_get_tunnel_index (u32 sw_if_index)
{
vxlan_main_t *vxm = &vxlan_main;
if (sw_if_index >= vec_len (vxm->tunnel_index_by_sw_if_index))
return ~0;
return vxm->tunnel_index_by_sw_if_index[sw_if_index];
}
static clib_error_t *
vxlan_offload_command_fn (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, *line_input = &_line_input;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
vnet_main_t *vnm = vnet_get_main ();
u32 rx_sw_if_index = ~0;
u32 hw_if_index = ~0;
int is_add = 1;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "hw %U", unformat_vnet_hw_interface, vnm,
&hw_if_index))
continue;
if (unformat (line_input, "rx %U", unformat_vnet_sw_interface, vnm,
&rx_sw_if_index))
continue;
if (unformat (line_input, "del"))
{
is_add = 0;
continue;
}
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, line_input);
}
if (rx_sw_if_index == ~0)
return clib_error_return (0, "missing rx interface");
if (hw_if_index == ~0)
return clib_error_return (0, "missing hw interface");
u32 t_index = vnet_vxlan_get_tunnel_index (rx_sw_if_index);;
if (t_index == ~0)
return clib_error_return (0, "%U is not a vxlan tunnel",
format_vnet_sw_if_index_name, vnm,
rx_sw_if_index);
vxlan_main_t *vxm = &vxlan_main;
vxlan_tunnel_t *t = pool_elt_at_index (vxm->tunnels, t_index);
if (!ip46_address_is_ip4 (&t->dst))
return clib_error_return (0, "currently only IPV4 tunnels are supported");
vnet_hw_interface_t *hw_if = vnet_get_hw_interface (vnm, hw_if_index);
ip4_main_t *im = &ip4_main;
u32 rx_fib_index =
vec_elt (im->fib_index_by_sw_if_index, hw_if->sw_if_index);
if (t->encap_fib_index != rx_fib_index)
return clib_error_return (0, "interface/tunnel fib mismatch");
if (vnet_vxlan_add_del_rx_flow (hw_if_index, t_index, is_add))
return clib_error_return (0, "error %s flow",
is_add ? "enabling" : "disabling");
return 0;
}
VLIB_CLI_COMMAND (vxlan_offload_command, static) = {
.path = "set flow-offload vxlan",
.short_help =
"set flow-offload vxlan hw <interface-name> rx <tunnel-name> [del]",
.function = vxlan_offload_command_fn,
};
#define VXLAN_HASH_NUM_BUCKETS (2 * 1024)
#define VXLAN_HASH_MEMORY_SIZE (1 << 20)
clib_error_t *
vxlan_init (vlib_main_t * vm)
{
vxlan_main_t *vxm = &vxlan_main;
vxm->vnet_main = vnet_get_main ();
vxm->vlib_main = vm;
vnet_flow_get_range (vxm->vnet_main, "vxlan", 1024 * 1024,
&vxm->flow_id_start);
vxm->bm_ip4_bypass_enabled_by_sw_if = 0;
vxm->bm_ip6_bypass_enabled_by_sw_if = 0;
/* initialize the ip6 hash */
clib_bihash_init_16_8 (&vxm->vxlan4_tunnel_by_key, "vxlan4",
VXLAN_HASH_NUM_BUCKETS, VXLAN_HASH_MEMORY_SIZE);
clib_bihash_init_24_8 (&vxm->vxlan6_tunnel_by_key, "vxlan6",
VXLAN_HASH_NUM_BUCKETS, VXLAN_HASH_MEMORY_SIZE);
vxm->vtep_table = vtep_table_create ();
vxm->mcast_shared = hash_create_mem (0,
sizeof (ip46_address_t),
sizeof (mcast_shared_t));
fib_node_register_type (FIB_NODE_TYPE_VXLAN_TUNNEL, &vxlan_vft);
return 0;
}
VLIB_INIT_FUNCTION (vxlan_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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