/*
* 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/graph.h>
/* Set link distance, creating link if not found. */
u32
graph_set_link (graph_t * g, u32 src, u32 dst, u32 distance)
{
graph_node_t *src_node, *dst_node;
graph_link_t *l;
u32 old_distance;
/* The following validate will not work if src or dst are on the
pool free list. */
if (src < vec_len (g->nodes))
ASSERT (!pool_is_free_index (g->nodes, src));
if (dst < vec_len (g->nodes))
ASSERT (!pool_is_free_index (g->nodes, dst));
/* Make new (empty) nodes to make src and dst valid. */
pool_validate_index (g->nodes, clib_max (src, dst));
src_node = pool_elt_at_index (g->nodes, src);
dst_node = pool_elt_at_index (g->nodes, dst);
l = graph_dir_get_link_to_node (&src_node->next, dst);
if (l)
{
old_distance = l->distance;
l->distance = distance;
l = graph_dir_get_link_to_node (&dst_node->/*
* node.c: gre packet processing
*
* Copyright (c) 2012 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 <vlib/vlib.h>
#include <vnet/pg/pg.h>
#include <vnet/gre/gre.h>
#include <vnet/mpls/mpls.h>
#include <vppinfra/sparse_vec.h>
#define foreach_gre_input_next \
_(PUNT, "error-punt") \
_(DROP, "error-drop") \
_(ETHERNET_INPUT, "ethernet-input") \
_(IP4_INPUT, "ip4-input") \
_(IP6_INPUT, "ip6-input") \
_(MPLS_INPUT, "mpls-input")
typedef enum
{
#define _(s,n) GRE_INPUT_NEXT_##s,
foreach_gre_input_next
#undef _
GRE_INPUT_N_NEXT,
} gre_input_next_t;
typedef struct
{
u32 tunnel_id;
u32 length;
ip46_address_t src;
ip46_address_t dst;
} gre_rx_trace_t;
extern u8 *format_gre_rx_trace (u8 * s, va_list * args);
#ifndef CLIB_MARCH_VARIANT
u8 *
format_gre_rx_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 *);
gre_rx_trace_t *t = va_arg (*args, gre_rx_trace_t *);
s = format (s, "GRE: tunnel %d len %d src %U dst %U",
t->tunnel_id, clib_net_to_host_u16 (t->length),
format_ip46_address, &t->src, IP46_TYPE_ANY,
format_ip46_address, &t->dst, IP46_TYPE_ANY);
return s;
}
#endif /* CLIB_MARCH_VARIANT */
typedef struct
{
/* Sparse vector mapping gre protocol in network byte order
to next index. */
u16 *next_by_protocol;
} gre_input_runtime_t;
always_inline void
gre_trace (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_buffer_t * b,
u32 tun_sw_if_index, const ip6_header_t * ip6,
const ip4_header_t * ip4, int is_ipv6)
{
gre_rx_trace_t *tr = vlib_add_trace (vm, node,
b, sizeof (*tr));
tr->tunnel_id = tun_sw_if_index;
if (is_ipv6)
{
tr->length = ip6->payload_length;
tr->src.ip6.as_u64[0] = ip6->src_address.as_u64[0];
tr->src.ip6.as_u64[1] = ip6->src_address.as_u64[1];
tr->dst.ip6.as_u64[0] = ip6->dst_address.as_u64[0];
tr->dst.ip6.as_u64[1] = ip6->dst_address.as_u64[1];
}
else
{
tr->length = ip4->length;
tr->src.as_u64[0] = tr->src.as_u64[1] = 0;
tr->dst.as_u64[0] = tr->dst.as_u64[1] = 0;
tr->src.ip4.as_u32 = ip4->src_address.as_u32;
tr->dst.ip4.as_u32 = ip4->dst_address.as_u32;
}
}
always_inline void
gre_tunnel_get (const gre_main_t * gm, vlib_node_runtime_t * node,
vlib_buffer_t * b, u16 * next, const gre_tunnel_key_t * key,
gre_tunnel_key_t * cached_key, u32 * tun_sw_if_index,
u32 * cached_tun_sw_if_index, int is_ipv6)
{
const uword *p;
p = is_ipv6 ? hash_get_mem (gm->tunnel_by_key6, &key->gtk_v6)
: hash_get_mem (gm->tunnel_by_key4, &key->gtk_v4);
if (PREDICT_FALSE (!p))
{
*next = GRE_INPUT_NEXT_DROP;
b->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
*tun_sw_if_index = ~0;
}
else
{
const gre_tunnel_t *tun;
tun = pool_elt_at_index (gm->tunnels, *p);
*cached_tun_sw_if_index = *tun_sw_if_index = tun->sw_if_index;
if (is_ipv6)
cached_key->gtk_v6 = key->gtk_v6;
else
cached_key->gtk_v4 = key->gtk_v4;
}
}
always_inline uword
gre_input (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame,
const int is_ipv6)
{
gre_main_t *gm = &gre_main;
u32 *from, n_left_from;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
u16 cached_protocol = ~0;
u32 cached_next_index = SPARSE_VEC_INVALID_INDEX;
u32 cached_tun_sw_if_index = ~0;
gre_tunnel_key_t cached_key;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
vlib_get_buffers (vm, from, bufs, n_left_from);
if (is_ipv6)
clib_memset (&cached_key.gtk_v6, 0xff, sizeof (cached_key.gtk_v6));
else
clib_memset (&cached_key.gtk_v4, 0xff, sizeof (cached_key.gtk_v4));
while (n_left_from >= 2)
{
const ip6_header_t *ip6[2];
const ip4_header_t *ip4[2];
const gre_header_t *gre[2];
u32 nidx[2];
next_info_t ni[2];
u8 type[2];
u16 version[2];
u32 len[2];
gre_tunnel_key_t key[2];
u8 matched[2];
u32 tun_sw_if_index[2];
if (PREDICT_TRUE (n_left_from >= 6))
{
vlib_prefetch_buffer_data (b[2], LOAD);
vlib_prefetch_buffer_data (b[3], LOAD);
vlib_prefetch_buffer_header (b[4], STORE);
vlib_prefetch_buffer_header (b[5], STORE);
}
if (is_ipv6)
{
/* ip6_local hands us the ip header, not the gre header */
ip6[0] = vlib_buffer_get_current (b[0]);
ip6[1] = vlib_buffer_get_current (b[1]);
gre[0] = (void *) (ip6[0] + 1);
gre[1] = (void *) (ip6[1] + 1);
vlib_buffer_advance (b[0], sizeof (*ip6[0]) + sizeof (*gre[0]));
vlib_buffer_advance (b[1], sizeof (*ip6[0]) + sizeof (*gre[0]));
}
else
{
/* ip4_local hands us the ip header, not the gre header */
ip4[0] = vlib_buffer_get_current (b[0]);
ip4[1] = vlib_buffer_get_current (b[1]);
gre[0] = (void *) (ip4[0] + 1);
gre[1] = (void *) (ip4[1] + 1);
vlib_buffer_advance (b[0], sizeof (*ip4[0]) + sizeof (*gre[0]));
vlib_buffer_advance (b[1], sizeof (*ip4[0]) + sizeof (*gre[0]));
}
if (PREDICT_TRUE (cached_protocol == gre[0]->protocol))
{
nidx[0] = cached_next_index;
}
else
{
cached_next_index = nidx[0] =
sparse_vec_index (gm->next_by_protocol, gre[0]->protocol);
cached_protocol = gre[0]->protocol;
}
if (PREDICT_TRUE (cached_protocol == gre[1]->protocol))
{
nidx[1] = cached_next_index;
}
else
{
cached_next_index = nidx[1] =
sparse_vec_index (gm->next_by_protocol, gre[1]->protocol);
cached_protocol = gre[1]->protocol;
}
ni[0] = vec_elt (gm->next_by_protocol, nidx[0]);
ni[1] = vec_elt (gm->next_by_protocol, nidx[1]);
next[0] = ni[0].next_index;
next[1] = ni[1].next_index;
type[0] = ni[0].tunnel_type;
type[1] = ni[1].tunnel_type;
b[0]->error = nidx[0] == SPARSE_VEC_INVALID_INDEX
? node->errors[GRE_ERROR_UNKNOWN_PROTOCOL]
: node->errors[GRE_ERROR_NONE];
b[1]->error = nidx[1] == SPARSE_VEC_INVALID_INDEX
? node->errors[GRE_ERROR_UNKNOWN_PROTOCOL]
: node->errors[GRE_ERROR_NONE];
version[0] = clib_net_to_host_u16 (gre[0]->flags_and_version);
version[1] = clib_net_to_host_u16 (gre[1]->flags_and_version);
version[0] &= GRE_VERSION_MASK;
version[1] &= GRE_VERSION_MASK;
b[0]->error = version[0]
? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[0]->error;
next[0] = version[0] ? GRE_INPUT_NEXT_DROP : next[0];
b[1]->error = version[1]
? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[1]->error;
next[1] = version[1] ? GRE_INPUT_NEXT_DROP : next[1];
len[0] = vlib_buffer_length_in_chain (vm, b[0]);
len[1] = vlib_buffer_length_in_chain (vm, b[1]);
if (is_ipv6)
{
gre_mk_key6 (&ip6[0]->dst_address,
&ip6[0]->src_address,
vnet_buffer (b[0])->ip.fib_index,
type[0], 0, &key[0].gtk_v6);
gre_mk_key6 (&ip6[1]->dst_address,
&ip6[1]->src_address,
vnet_buffer (b[1])->ip.fib_index,
type[1], 0, &key[1].gtk_v6);
matched[0] = gre_match_key6 (&cached_key.gtk_v6, &key[0].gtk_v6);
matched[1] = gre_match_key6 (&cached_key.gtk_v6, &key[1].gtk_v6);
}
else
{
gre_mk_key4 (ip4[0]->dst_address,
ip4[0]->src_address,
vnet_buffer (b[0])->ip.fib_index,
type[0], 0, &key[0].gtk_v4);
gre_mk_key4 (ip4[1]->dst_address,
ip4[1]->src_address,
vnet_buffer (b[1])->ip.fib_index,
type[1], 0, &key[1].gtk_v4);
matched[0] = gre_match_key4 (&cached_key.gtk_v4, &key[0].gtk_v4);
matched[1] = gre_match_key4 (&cached_key.gtk_v4, &key[1].gtk_v4);
}
tun_sw_if_index[0] = cached_tun_sw_if_index;
tun_sw_if_index[1] = cached_tun_sw_if_index;
if (PREDICT_FALSE (!matched[0]))
gre_tunnel_get (gm, node, b[0], &next[0], &key[0], &cached_key,
&tun_sw_if_index[0], &cached_tun_sw_if_index,
is_ipv6);
if (PREDICT_FALSE (!matched[1]))
gre_tunnel_get (gm, node, b[1], &next[1], &key[1], &cached_key,
&tun_sw_if_index[1], &cached_tun_sw_if_index,
is_ipv6);
if (PREDICT_TRUE (next[0] > GRE_INPUT_NEXT_DROP))
{
vlib_increment_combined_counter (&gm->vnet_main->
interface_main.combined_sw_if_counters
[VNET_INTERFACE_COUNTER_RX],
vm->thread_index,
tun_sw_if_index[0],
1 /* packets */ ,
len[0] /* bytes */ );
vnet_buffer (b[0])->sw_if_index[VLIB_RX] = tun_sw_if_index[0];
}
if (PREDICT_TRUE (next[1] > GRE_INPUT_NEXT_DROP))
{
vlib_increment_combined_counter (&gm->vnet_main->
interface_main.combined_sw_if_counters
[VNET_INTERFACE_COUNTER_RX],
vm->thread_index,
tun_sw_if_index[1],
1 /* packets */ ,
len[1] /* bytes */ );
vnet_buffer (b[1])->sw_if_index[VLIB_RX] = tun_sw_if_index[1];
}
if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
gre_trace (vm, node, b[0], tun_sw_if_index[0], ip6[0], ip4[0],
is_ipv6);
if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED))
gre_trace (vm, node, b[1], tun_sw_if_index[1], ip6[1], ip4[1],
is_ipv6);
b += 2;
next += 2;
n_left_from -= 2;
}
while (n_left_from >= 1)
{
const ip6_header_t *ip6[1];
const ip4_header_t *ip4[1];
const gre_header_t *gre[1];
u32 nidx[1];
next_info_t ni[1];
u8 type[1];
u16 version[1];
u32 len[1];
gre_tunnel_key_t key[1];
u8 matched[1];
u32 tun_sw_if_index[1];
if (PREDICT_TRUE (n_left_from >= 3))
{
vlib_prefetch_buffer_data (b[1], LOAD);
vlib_prefetch_buffer_header (b[2], STORE);
}
if (is_ipv6)
{
/* ip6_local hands us the ip header, not the gre header */
ip6[0] = vlib_buffer_get_current (b[0]);
gre[0] = (void *) (ip6[0] + 1);
vlib_buffer_advance (b[0], sizeof (*ip6[0]) + sizeof (*gre[0]));
}
else
{
/* ip4_local hands us the ip header, not the gre header */
ip4[0] = vlib_buffer_get_current (b[0]);
gre[0] = (void *) (ip4[0] + 1);
vlib_buffer_advance (b[0], sizeof (*ip4[0]) + sizeof (*gre[0]));
}
if (PREDICT_TRUE (cached_protocol == gre[0]->protocol))
{
nidx[0] = cached_next_index;
}
else
{
cached_next_index = nidx[0] =
sparse_vec_index (gm->next_by_protocol, gre[0]->protocol);
cached_protocol = gre[0]->protocol;
}
ni[0] = vec_elt (gm->next_by_protocol, nidx[0]);
next[0] = ni[0].next_index;
type[0] = ni[0].tunnel_type;
b[0]->error = nidx[0] == SPARSE_VEC_INVALID_INDEX
? node->errors[GRE_ERROR_UNKNOWN_PROTOCOL]
: node->errors[GRE_ERROR_NONE];
version[0] = clib_net_to_host_u16 (gre[0]->flags_and_version);
version[0] &= GRE_VERSION_MASK;
b[0]->error = version[0]
? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[0]->error;
next[0] = version[0] ? GRE_INPUT_NEXT_DROP : next[0];
len[0] = vlib_buffer_length_in_chain (vm, b[0]);
if (is_ipv6)
{
gre_mk_key6 (&ip6[0]->dst_address,
&ip6[0]->src_address,
vnet_buffer (b[0])->ip.fib_index,
type[0], 0, &key[0].gtk_v6);
matched[0] = gre_match_key6 (&cached_key.gtk_v6, &key[0].gtk_v6);
}
else
{
gre_mk_key4 (ip4[0]->dst_address,
ip4[0]->src_address,
vnet_buffer (b[0])->ip.fib_index,
type[0], 0, &key[0].gtk_v4);
matched[0] = gre_match_key4 (&cached_key.gtk_v4, &key[0].gtk_v4);
}
tun_sw_if_index[0] = cached_tun_sw_if_index;
if (PREDICT_FALSE (!matched[0]))
gre_tunnel_get (gm, node, b[0], &next[0], &key[0], &cached_key,
&tun_sw_if_index[0], &cached_tun_sw_if_index,
is_ipv6);
if (PREDICT_TRUE (next[0] > GRE_INPUT_NEXT_DROP))
{
vlib_increment_combined_counter (&gm->vnet_main->
interface_main.combined_sw_if_counters
[VNET_INTERFACE_COUNTER_RX],
vm->thread_index,
tun_sw_if_index[0],
1 /* packets */ ,
len[0] /* bytes */ );
vnet_buffer (b[0])->sw_if_index[VLIB_RX] = tun_sw_if_index[0];
}
if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
gre_trace (vm, node, b[0], tun_sw_if_index[0], ip6[0], ip4[0],
is_ipv6);
b += 1;
next += 1;
n_left_from -= 1;
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
vlib_node_increment_counter (vm,
is_ipv6 ? gre6_input_node.index :
gre4_input_node.index, GRE_ERROR_PKTS_DECAP,
n_left_from);
return frame->n_vectors;
}
VLIB_NODE_FN (gre4_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return gre_input (vm, node, from_frame, /* is_ip6 */ 0);
}
VLIB_NODE_FN (gre6_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return gre_input (vm, node, from_frame, /* is_ip6 */ 1);
}
static char *gre_error_strings[] = {
#define gre_error(n,s) s,
#include "error.def"
#undef gre_error
};
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (gre4_input_node) = {
.name = "gre4-input",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = GRE_N_ERROR,
.error_strings = gre_error_strings,
.n_next_nodes = GRE_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [GRE_INPUT_NEXT_##s] = n,
foreach_gre_input_next
#undef _
},
.format_buffer = format_gre_header_with_length,
.format_trace = format_gre_rx_trace,
.unformat_buffer = unformat_gre_header,
};
VLIB_REGISTER_NODE (gre6_input_node) = {
.name = "gre6-input",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.runtime_data_bytes = sizeof (gre_input_runtime_t),
.n_errors = GRE_N_ERROR,
.error_strings = gre_error_strings,
.n_next_nodes = GRE_INPUT_N_NEXT,
.next_nodes = {
#define _(s,n) [GRE_INPUT_NEXT_##s] = n,
foreach_gre_input_next
#undef _
},
.format_buffer = format_gre_header_with_length,
.format_trace = format_gre_rx_trace,
.unformat_buffer = unformat_gre_header,
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
void
gre_register_input_protocol (vlib_main_t * vm,
gre_protocol_t protocol, u32 node_index,
gre_tunnel_type_t tunnel_type)
{
gre_main_t *em = &gre_main;
gre_protocol_info_t *pi;
next_info_t *n;
u32 i;
{
clib_error_t *error = vlib_call_init_function (vm, gre_input_init);
if (error)
clib_error_report (error);
}
pi = gre_get_protocol_info (em, protocol);
pi->node_index = node_index;
pi->tunnel_type = tunnel_type;
pi->next_index = vlib_node_add_next (vm, gre4_input_node.index, node_index);
i = vlib_node_add_next (vm, gre6_input_node.index, node_index);
ASSERT (i == pi->next_index);
/* Setup gre protocol -> next index sparse vector mapping. */
n = sparse_vec_validate (em->next_by_protocol,
clib_host_to_net_u16 (protocol));
n->next_index = pi->next_index;
n->tunnel_type = tunnel_type;
}
static void
gre_setup_node (vlib_main_t * vm, u32 node_index)
{
vlib_node_t *n = vlib_get_node (vm, node_index);
pg_node_t *pn = pg_get_node (node_index);
n->format_buffer = format_gre_header_with_length;
n->unformat_buffer = unformat_gre_header;
pn->unformat_edit = unformat_pg_gre_header;
}
static clib_error_t *
gre_input_init (vlib_main_t * vm)
{
gre_main_t *gm = &gre_main;
vlib_node_t *ethernet_input, *ip4_input, *ip6_input, *mpls_unicast_input;
{
clib_error_t *error;
error = vlib_call_init_function (vm, gre_init);
if (error)
clib_error_report (error);
}
gre_setup_node (vm, gre4_input_node.index);
gre_setup_node (vm, gre6_input_node.index);
gm->next_by_protocol = sparse_vec_new
( /* elt bytes */ sizeof (gm->next_by_protocol[0]),
/* bits in index */ BITS (((gre_header_t *) 0)->protocol));
/* These could be moved to the supported protocol input node defn's */
ethernet_input = vlib_get_node_by_name (vm, (u8 *) "ethernet-input");
ASSERT (ethernet_input);
ip4_input = vlib_get_node_by_name (vm, (u8 *) "ip4-input");
ASSERT (ip4_input);
ip6_input = vlib_get_node_by_name (vm, (u8 *) "ip6-input");
ASSERT (ip6_input);
mpls_unicast_input = vlib_get_node_by_name (vm, (u8 *) "mpls-input");
ASSERT (mpls_unicast_input);
gre_register_input_protocol (vm, GRE_PROTOCOL_teb,
ethernet_input->index, GRE_TUNNEL_TYPE_TEB);
gre_register_input_protocol (vm, GRE_PROTOCOL_ip4,
ip4_input->index, GRE_TUNNEL_TYPE_L3);
gre_register_input_protocol (vm, GRE_PROTOCOL_ip6,
ip6_input->index, GRE_TUNNEL_TYPE_L3);
gre_register_input_protocol (vm, GRE_PROTOCOL_mpls_unicast,
mpls_unicast_input->index, GRE_TUNNEL_TYPE_L3);
ip4_register_protocol (IP_PROTOCOL_GRE, gre4_input_node.index);
ip6_register_protocol (IP_PROTOCOL_GRE, gre6_input_node.index);
return 0;
}
VLIB_INIT_FUNCTION (gre_input_init);
#endif /* CLIB_MARCH_VARIANT */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
