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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 <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/vxlan/vxlan.h>
#include <vnet/qos/qos_types.h>
/* Statistics (not all errors) */
#define foreach_vxlan_encap_error \
_(ENCAPSULATED, "good packets encapsulated")
static char * vxlan_encap_error_strings[] = {
#define _(sym,string) string,
foreach_vxlan_encap_error
#undef _
};
typedef enum {
#define _(sym,str) VXLAN_ENCAP_ERROR_##sym,
foreach_vxlan_encap_error
#undef _
VXLAN_ENCAP_N_ERROR,
} vxlan_encap_error_t;
typedef enum {
VXLAN_ENCAP_NEXT_DROP,
VXLAN_ENCAP_N_NEXT,
} vxlan_encap_next_t;
typedef struct {
u32 tunnel_index;
u32 vni;
} vxlan_encap_trace_t;
u8 * format_vxlan_encap_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
vxlan_encap_trace_t * t
= va_arg (*args, vxlan_encap_trace_t *);
s = format (s, "VXLAN encap to vxlan_tunnel%d vni %d",
t->tunnel_index, t->vni);
return s;
}
always_inline uword
vxlan_encap_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame,
u8 is_ip4, u8 csum_offload)
{
u32 n_left_from, next_index, * from, * to_next;
vxlan_main_t * vxm = &vxlan_main;
vnet_main_t * vnm = vxm->vnet_main;
vnet_interface_main_t * im = &vnm->interface_main;
vlib_combined_counter_main_t * tx_counter =
im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX;
u32 pkts_encapsulated = 0;
u32 thread_index = vlib_get_thread_index();
u32 sw_if_index0 = 0, sw_if_index1 = 0;
u32 next0 = 0, next1 = 0;
vxlan_tunnel_t * t0 = NULL, * t1 = NULL;
index_t dpoi_idx0 = INDEX_INVALID, dpoi_idx1 = INDEX_INVALID;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
next_index = node->cached_next_index;
STATIC_ASSERT_SIZEOF(ip6_vxlan_header_t, 56);
STATIC_ASSERT_SIZEOF(ip4_vxlan_header_t, 36);
word const underlay_hdr_len = is_ip4 ?
sizeof(ip4_vxlan_header_t) : sizeof(ip6_vxlan_header_t);
u16 const l3_len = is_ip4 ? sizeof(ip4_header_t) : sizeof(ip6_header_t);
u32 const csum_flags = is_ip4 ?
VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4 |
VNET_BUFFER_F_OFFLOAD_UDP_CKSUM :
VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index,
to_next, n_left_to_next);
while (n_left_from >= 4 && n_left_to_next >= 2)
{
/* Prefetch next iteration. */
{
vlib_buffer_t * p2, * p3;
p2 = vlib_get_buffer (vm, from[2]);
p3 = vlib_get_buffer (vm, from[3]);
vlib_prefetch_buffer_header (p2, LOAD);
vlib_prefetch_buffer_header (p3, LOAD);
CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
}
u32 bi0 = from[0];
u32 bi1 = from[1];
vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
vlib_buffer_t * b1 = vlib_get_buffer (vm, bi1);
u32 flow_hash0 = vnet_l2_compute_flow_hash (b0);
u32 flow_hash1 = vnet_l2_compute_flow_hash (b1);
to_next[0] = bi0;
to_next[1] = bi1;
from += 2;
to_next += 2;
n_left_to_next -= 2;
n_left_from -= 2;
/* Get next node index and adj index from tunnel next_dpo */
if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
{
sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
vnet_hw_interface_t *hi0 =
vnet_get_sup_hw_interface (vnm, sw_if_index0);
t0 = &vxm->tunnels[hi0->dev_instance];
/* Note: change to always set next0 if it may set to drop */
next0 = t0->next_dpo.dpoi_next_node;
dpoi_idx0 = t0->next_dpo.dpoi_index;
}
/* Get next node index and adj index from tunnel next_dpo */
if (sw_if_index1 != vnet_buffer(b1)->sw_if_index[VLIB_TX])
{
if (sw_if_index0 == vnet_buffer(b1)->sw_if_index[VLIB_TX])
{
sw_if_index1 = sw_if_index0;
t1 = t0;
next1 = next0;
dpoi_idx1 = dpoi_idx0;
}
else
{
sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
vnet_hw_interface_t *hi1 =
vnet_get_sup_hw_interface (vnm, sw_if_index1);
t1 = &vxm->tunnels[hi1->dev_instance];
/* Note: change to always set next1 if it may set to drop */
next1 = t1->next_dpo.dpoi_next_node;
dpoi_idx1 = t1->next_dpo.dpoi_index;
}
}
vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
vnet_buffer(b1)->ip.adj_index[VLIB_TX] = dpoi_idx1;
ASSERT(vec_len(t0->rewrite) == underlay_hdr_len);
ASSERT(vec_len(t1->rewrite) == underlay_hdr_len);
vlib_buffer_advance (b0, -underlay_hdr_len);
vlib_buffer_advance (b1, -underlay_hdr_len);
u32 len0 = vlib_buffer_length_in_chain (vm, b0);
u32 len1 = vlib_buffer_length_in_chain (vm, b1);
u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
u16 payload_l1 = clib_host_to_net_u16 (len1 - l3_len);
ip4_header_t * ip4_0, * ip4_1;
qos_bits_t ip4_0_tos = 0, ip4_1_tos = 0;
ip6_header_t * ip6_0, * ip6_1;
udp_header_t * udp0, * udp1;
u8 * l3_0, * l3_1;
if (is_ip4)
{
ip4_vxlan_header_t * hdr0 = vlib_buffer_get_current(b0);
ip4_vxlan_header_t * rewrite0 = (void *)t0->rewrite;
ip4_vxlan_header_t * hdr1 = vlib_buffer_get_current(b1);
ip4_vxlan_header_t * rewrite1 = (void *)t1->rewrite;
*hdr0 = *rewrite0;
*hdr1 = *rewrite1;
/* Fix the IP4 checksum and length */
ip4_0 = &hdr0->ip4;
ip4_1 = &hdr1->ip4;
ip4_0->length = clib_host_to_net_u16 (len0);
ip4_1->length = clib_host_to_net_u16 (len1);
if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
{
ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
ip4_0->tos = ip4_0_tos;
}
if (PREDICT_FALSE (b1->flags & VNET_BUFFER_F_QOS_DATA_VALID))
{
ip4_1_tos = vnet_buffer2 (b1)->qos.bits;
ip4_1->tos = ip4_1_tos;
}
l3_0 = (u8 *)ip4_0;
l3_1 = (u8 *)ip4_1;
udp0 = &hdr0->udp;
udp1 = &hdr1->udp;
}
else /* ipv6 */
{
ip6_vxlan_header_t * hdr0 = vlib_buffer_get_current(b0);
ip6_vxlan_header_t * rewrite0 = (void *) t0->rewrite;
ip6_vxlan_header_t * hdr1 = vlib_buffer_get_current(b0);
ip6_vxlan_header_t * rewrite1 = (void *) t1->rewrite;
*hdr0 = *rewrite0;
*hdr1 = *rewrite1;
/* Fix IP6 payload length */
ip6_0 = &hdr0->ip6;
ip6_1 = &hdr1->ip6;
ip6_0->payload_length = payload_l0;
ip6_1->payload_length = payload_l1;
l3_0 = (u8 *)ip6_0;
l3_1 = (u8 *)ip6_1;
udp0 = &hdr0->udp;
udp1 = &hdr1->udp;
}
/* Fix UDP length and set source port */
udp0->length = payload_l0;
udp0->src_port = flow_hash0;
udp1->length = payload_l1;
udp1->src_port = flow_hash1;
if (csum_offload)
{
b0->flags |= csum_flags;
vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
b1->flags |= csum_flags;
vnet_buffer (b1)->l3_hdr_offset = l3_1 - b1->data;
vnet_buffer (b1)->l4_hdr_offset = (u8 *) udp1 - b1->data;
}
/* IPv4 UDP checksum only if checksum offload is used */
else if (is_ip4)
{
ip_csum_t sum0 = ip4_0->checksum;
sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
length /* changed member */);
if (PREDICT_FALSE (ip4_0_tos))
{
sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t,
tos /* changed member */);
}
ip4_0->checksum = ip_csum_fold (sum0);
ip_csum_t sum1 = ip4_1->checksum;
sum1 = ip_csum_update (sum1, 0, ip4_1->length, ip4_header_t,
length /* changed member */);
if (PREDICT_FALSE (ip4_1_tos))
{
sum1 = ip_csum_update (sum1, 0, ip4_1_tos, ip4_header_t,
tos /* changed member */);
}
ip4_1->checksum = ip_csum_fold (sum1);
}
/* IPv6 UDP checksum is mandatory */
else
{
int bogus = 0;
udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
(vm, b0, ip6_0, &bogus);
ASSERT(bogus == 0);
if (udp0->checksum == 0)
udp0->checksum = 0xffff;
udp1->checksum = ip6_tcp_udp_icmp_compute_checksum
(vm, b1, ip6_1, &bogus);
ASSERT(bogus == 0);
if (udp1->checksum == 0)
udp1->checksum = 0xffff;
}
vlib_increment_combined_counter (tx_counter, thread_index,
sw_if_index0, 1, len0);
vlib_increment_combined_counter (tx_counter, thread_index,
sw_if_index1, 1, len1);
pkts_encapsulated += 2;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
vxlan_encap_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->tunnel_index = t0 - vxm->tunnels;
tr->vni = t0->vni;
}
if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
{
vxlan_encap_trace_t *tr =
vlib_add_trace (vm, node, b1, sizeof (*tr));
tr->tunnel_index = t1 - vxm->tunnels;
tr->vni = t1->vni;
}
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0 = from[0];
vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0);
u32 flow_hash0 = vnet_l2_compute_flow_hash(b0);
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
/* Get next node index and adj index from tunnel next_dpo */
if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX])
{
sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
vnet_hw_interface_t *hi0 =
vnet_get_sup_hw_interface (vnm, sw_if_index0);
t0 = &vxm->tunnels[hi0->dev_instance];
/* Note: change to always set next0 if it may be set to drop */
next0 = t0->next_dpo.dpoi_next_node;
dpoi_idx0 = t0->next_dpo.dpoi_index;
}
vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
ASSERT(vec_len(t0->rewrite) == underlay_hdr_len);
vlib_buffer_advance (b0, -underlay_hdr_len);
u32 len0 = vlib_buffer_length_in_chain (vm, b0);
u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
udp_header_t * udp0;
ip4_header_t * ip4_0;
qos_bits_t ip4_0_tos = 0;
ip6_header_t * ip6_0;
u8 * l3_0;
if (is_ip4)
{
ip4_vxlan_header_t * rewrite = (void *)t0->rewrite;
ip4_vxlan_header_t * hdr = vlib_buffer_get_current(b0);
*hdr = *rewrite;
/* Fix the IP4 checksum and length */
ip4_0 = &hdr->ip4;
ip4_0->length = clib_host_to_net_u16 (len0);
if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
{
ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
ip4_0->tos = ip4_0_tos;
}
l3_0 = (u8*)ip4_0;
udp0 = &hdr->udp;
}
else /* ip6 path */
{
ip6_vxlan_header_t * hdr = vlib_buffer_get_current(b0);
ip6_vxlan_header_t * rewrite = (void *) t0->rewrite;
*hdr = *rewrite;
/* Fix IP6 payload length */
ip6_0 = &hdr->ip6;
ip6_0->payload_length = payload_l0;
l3_0 = (u8 *)ip6_0;
udp0 = &hdr->udp;
}
/* Fix UDP length and set source port */
udp0->length = payload_l0;
udp0->src_port = flow_hash0;
if (csum_offload)
{
b0->flags |= csum_flags;
vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
}
/* IPv4 UDP checksum only if checksum offload is used */
else if (is_ip4)
{
ip_csum_t sum0 = ip4_0->checksum;
sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
length /* changed member */);
if (PREDICT_FALSE (ip4_0_tos))
{
sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t,
tos /* changed member */);
}
ip4_0->checksum = ip_csum_fold (sum0);
}
/* IPv6 UDP checksum is mandatory */
else
{
int bogus = 0;
udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
(vm, b0, ip6_0, &bogus);
ASSERT(bogus == 0);
if (udp0->checksum == 0)
udp0->checksum = 0xffff;
}
vlib_increment_combined_counter (tx_counter, thread_index,
sw_if_index0, 1, len0);
pkts_encapsulated ++;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
vxlan_encap_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->tunnel_index = t0 - vxm->tunnels;
tr->vni = t0->vni;
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
/* Do we still need this now that tunnel tx stats is kept? */
vlib_node_increment_counter (vm, node->node_index,
VXLAN_ENCAP_ERROR_ENCAPSULATED,
pkts_encapsulated);
return from_frame->n_vectors;
}
static uword
vxlan4_encap (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
/* Disable chksum offload as setup overhead in tx node is not worthwhile
for ip4 header checksum only, unless udp checksum is also required */
return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 1,
/* csum_offload */ 0);
}
static uword
vxlan6_encap (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
/* Enable checksum offload for ip6 as udp checksum is mandatory, */
return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 0,
/* csum_offload */ 1);
}
VLIB_REGISTER_NODE (vxlan4_encap_node) = {
.function = vxlan4_encap,
.name = "vxlan4-encap",
.vector_size = sizeof (u32),
.format_trace = format_vxlan_encap_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(vxlan_encap_error_strings),
.error_strings = vxlan_encap_error_strings,
.n_next_nodes = VXLAN_ENCAP_N_NEXT,
.next_nodes = {
[VXLAN_ENCAP_NEXT_DROP] = "error-drop",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_encap_node, vxlan4_encap)
VLIB_REGISTER_NODE (vxlan6_encap_node) = {
.function = vxlan6_encap,
.name = "vxlan6-encap",
.vector_size = sizeof (u32),
.format_trace = format_vxlan_encap_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(vxlan_encap_error_strings),
.error_strings = vxlan_encap_error_strings,
.n_next_nodes = VXLAN_ENCAP_N_NEXT,
.next_nodes = {
[VXLAN_ENCAP_NEXT_DROP] = "error-drop",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_encap_node, vxlan6_encap)
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