/*
* Copyright (c) 2018 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 <vnet/dpo/dvr_dpo.h>
#include <vnet/dpo/drop_dpo.h>
#include <vnet/vxlan-gbp/vxlan_gbp_packet.h>
#include <vnet/vxlan-gbp/vxlan_gbp.h>
#include <plugins/gbp/gbp.h>
#include <plugins/gbp/gbp_policy_dpo.h>
#include <plugins/gbp/gbp_recirc.h>
#ifndef CLIB_MARCH_VARIANT
/**
* DPO pool
*/
gbp_policy_dpo_t *gbp_policy_dpo_pool;
/**
* DPO type registered for these GBP FWD
*/
dpo_type_t gbp_policy_dpo_type;
static gbp_policy_dpo_t *
gbp_policy_dpo_alloc (void)
{
gbp_policy_dpo_t *gpd;
pool_get_aligned_zero (gbp_policy_dpo_pool, gpd, CLIB_CACHE_LINE_BYTES);
return (gpd);
}
static inline gbp_policy_dpo_t *
gbp_policy_dpo_get_from_dpo (const dpo_id_t * dpo)
{
ASSERT (gbp_policy_dpo_type == dpo->dpoi_type);
return (gbp_policy_dpo_get (dpo->dpoi_index));
}
static inline index_t
gbp_policy_dpo_get_index (gbp_policy_dpo_t * gpd)
{
return (gpd - gbp_policy_dpo_pool);
}
static void
gbp_policy_dpo_lock (dpo_id_t * dpo)
{
gbp_policy_dpo_t *gpd;
gpd = gbp_policy_dpo_get_from_dpo (dpo);
gpd->gpd_locks++;
}
static void
gbp_policy_dpo_unlock (dpo_id_t * dpo)
{
gbp_policy_dpo_t *gpd;
gpd = gbp_policy_dpo_get_from_dpo (dpo);
gpd->gpd_locks--;
if (0 == gpd->gpd_locks)
{
dpo_reset (&gpd->gpd_dpo);
pool_put (gbp_policy_dpo_pool, gpd);
}
}
static u32
gbp_policy_dpo_get_urpf (const dpo_id_t * dpo)
{
gbp_policy_dpo_t *gpd;
gpd = gbp_policy_dpo_get_from_dpo (dpo);
return (gpd->gpd_sw_if_index);
}
void
gbp_policy_dpo_add_or_lock (dpo_proto_t dproto,
sclass_t sclass, u32 sw_if_index, dpo_id_t * dpo)
{
gbp_policy_dpo_t *gpd;
dpo_id_t parent = DPO_INVALID;
gpd = gbp_policy_dpo_alloc ();
gpd->gpd_proto = dproto;
gpd->gpd_sw_if_index = sw_if_index;
gpd->gpd_sclass = sclass;
if (~0 != sw_if_index)
{
/*
* stack on the DVR DPO for the output interface
*/
dvr_dpo_add_or_lock (sw_if_index, dproto, &parent);
}
else
{
dpo_copy (&parent, drop_dpo_get (dproto));
}
dpo_stack (gbp_policy_dpo_type, dproto, &gpd->gpd_dpo, &parent);
dpo_set (dpo, gbp_policy_dpo_type, dproto, gbp_policy_dpo_get_index (gpd));
}
u8 *
format_gbp_policy_dpo (u8 * s, va_list * ap)
{
index_t index = va_arg (*ap, index_t);
u32 indent = va_arg (*ap, u32);
gbp_policy_dpo_t *gpd = gbp_policy_dpo_get (index);
vnet_main_t *vnm = vnet_get_main ();
s = format (s, "gbp-policy-dpo: %U, sclass:%d out:%U",
format_dpo_proto, gpd->gpd_proto,
(int) gpd->gpd_sclass,
format_vnet_sw_if_index_name, vnm, gpd->gpd_sw_if_index);
s = format (s, "\n%U", format_white_space, indent + 2);
s = format (s, "%U", format_dpo_id, &gpd->gpd_dpo, indent + 4);
return (s);
}
/**
* Interpose a policy DPO
*/
static void
gbp_policy_dpo_interpose (const dpo_id_t * original,
const dpo_id_t * parent, dpo_id_t * clone)
{
gbp_policy_dpo_t *gpd, *gpd_clone;
gpd_clone = gbp_policy_dpo_alloc ();
gpd = gbp_policy_dpo_get (original->dpoi_index);
gpd_clone->gpd_proto = gpd->gpd_proto;
gpd_clone->gpd_sclass = gpd->gpd_sclass;
gpd_clone->gpd_sw_if_index = gpd->gpd_sw_if_index;
/*
* if no interface is provided, grab one from the parent
* on which we stack
*/
if (~0 == gpd_clone->gpd_sw_if_index)
gpd_clone->gpd_sw_if_index = dpo_get_urpf (parent);
dpo_stack (gbp_policy_dpo_type,
gpd_clone->gpd_proto, &gpd_clone->gpd_dpo, parent);
dpo_set (clone,
gbp_policy_dpo_type,
gpd_clone->gpd_proto, gbp_policy_dpo_get_index (gpd_clone));
}
const static dpo_vft_t gbp_policy_dpo_vft = {
.dv_lock = gbp_policy_dpo_lock,
.dv_unlock = gbp_policy_dpo_unlock,
.dv_format = format_gbp_policy_dpo,
.dv_get_urpf = gbp_policy_dpo_get_urpf,
.dv_mk_interpose = gbp_policy_dpo_interpose,
};
/**
* @brief The per-protocol VLIB graph nodes that are assigned to a glean
* object.
*
* this means that these graph nodes are ones from which a glean is the
* parent object in the DPO-graph.
*/
const static char *const gbp_policy_dpo_ip4_nodes[] = {
"ip4-gbp-policy-dpo",
NULL,
};
const static char *const gbp_policy_dpo_ip6_nodes[] = {
"ip6-gbp-policy-dpo",
NULL,
};
const static char *const *const gbp_policy_dpo_nodes[DPO_PROTO_NUM] = {
[DPO_PROTO_IP4] = gbp_policy_dpo_ip4_nodes,
[DPO_PROTO_IP6] = gbp_policy_dpo_ip6_nodes,
};
dpo_type_t
gbp_policy_dpo_get_type (void)
{
return (gbp_policy_dpo_type);
}
static clib_error_t *
gbp_policy_dpo_module_init (vlib_main_t * vm)
{
gbp_policy_dpo_type = dpo_register_new_type (&gbp_policy_dpo_vft,
gbp_policy_dpo_nodes);
return (NULL);
}
VLIB_INIT_FUNCTION (gbp_policy_dpo_module_init);
#endif /* CLIB_MARCH_VARIANT */
typedef enum
{
#define _(sym,str) GBP_POLICY_DPO_ERROR_##sym,
foreach_gbp_policy_error
#undef _
GBP_POLICY_N_ERROR,
} gbp_policy_dpo_error_t;
static char *gbp_policy_dpo_error_strings[] = {
#define _(sym,string) string,
foreach_gbp_policy_error
#undef _
};
typedef struct gbp_policy_dpo_trace_t_
{
u32 sclass;
u32 dclass;
u32 acl_index;
u32 flags;
u32 action;
} gbp_policy_dpo_trace_t;
typedef enum
{
GBP_POLICY_DROP,
GBP_POLICY_N_NEXT,
} gbp_policy_next_t;
always_inline u32
gbp_rule_l3_redirect (const gbp_rule_t * gu, vlib_buffer_t * b0, int is_ip6)
{
gbp_policy_node_t pnode;
const dpo_id_t *dpo;
dpo_proto_t dproto;
pnode = (is_ip6 ? GBP_POLICY_NODE_IP6 : GBP_POLICY_NODE_IP4);
dproto = (is_ip6 ? DPO_PROTO_IP6 : DPO_PROTO_IP4);
dpo = &gu->gu_dpo[pnode][dproto];
/* The flow hash is still valid as this is a IP packet being switched */
vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo->dpoi_index;
return (dpo->dpoi_next_node);
}
always_inline uword
gbp_policy_dpo_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame, u8 is_ip6)
{
gbp_main_t *gm = &gbp_main;
u32 n_left_from, next_index, *from, *to_next, thread_index;
u32 n_allow_intra, n_allow_a_bit, n_allow_sclass_1;
gbp_rule_t *gu;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
n_allow_intra = n_allow_a_bit = n_allow_sclass_1 = 0;
thread_index = vm->thread_index;
next_index = node->cached_next_index;
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 > 0 && n_left_to_next > 0)
{
const gbp_policy_dpo_t *gpd0;
u32 bi0, next0;
gbp_contract_key_t key0;
gbp_contract_t *gc0;
vlib_buffer_t *b0;
index_t gci0;
u8 action0;
action0 = 0;
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
next0 = GBP_POLICY_DROP;
b0 = vlib_get_buffer (vm, bi0);
gc0 = NULL;
gpd0 = gbp_policy_dpo_get (vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
vnet_buffer (b0)->ip.adj_index[VLIB_TX] = gpd0->gpd_dpo.dpoi_index;
/*
* Reflection check; in and out on an ivxlan tunnel
*/
if ((~0 != vxlan_gbp_tunnel_by_sw_if_index (gpd0->gpd_sw_if_index))
&& (vnet_buffer2 (b0)->gbp.flags & VXLAN_GBP_GPFLAGS_R))
{
goto trace;
}
if (vnet_buffer2 (b0)->gbp.flags & VXLAN_GBP_GPFLAGS_A)
{
next0 = gpd0->gpd_dpo.dpoi_next_node;
key0.as_u32 = ~0;
n_allow_a_bit++;
goto trace;
}
key0.gck_src = vnet_buffer2 (b0)->gbp.sclass;
key0.gck_dst = gpd0->gpd_sclass;
if (SCLASS_INVALID != key0.gck_src)
{
if (PREDICT_FALSE (key0.gck_src == key0.gck_dst))
{
/*
* intra-epg allowed
*/
next0 = gpd0->gpd_dpo.dpoi_next_node;
vnet_buffer2 (b0)->gbp.flags |= VXLAN_GBP_GPFLAGS_A;
n_allow_intra++;
action0 = 0;
}
else if (PREDICT_FALSE (key0.gck_src == 1 || key0.gck_dst == 1))
{
/*
* sclass or dclass 1 allowed
*/
next0 = gpd0->gpd_dpo.dpoi_next_node;
vnet_buffer2 (b0)->gbp.flags |= VXLAN_GBP_GPFLAGS_A;
n_allow_sclass_1++;
action0 = 0;
}
else
{
gci0 = gbp_contract_find (&key0);
if (INDEX_INVALID != gci0)
{
fa_5tuple_opaque_t pkt_5tuple0;
u32 acl_pos_p0, acl_match_p0;
u32 rule_match_p0, trace_bitmap0;
/*
* tests against the ACL
*/
gc0 = gbp_contract_get (gci0);
acl_plugin_fill_5tuple_inline (gm->
acl_plugin.p_acl_main,
gc0->gc_lc_index, b0,
is_ip6,
/* is_input */ 1,
/* is_l2_path */ 0,
&pkt_5tuple0);
acl_plugin_match_5tuple_inline (gm->
acl_plugin.p_acl_main,
gc0->gc_lc_index,
&pkt_5tuple0, is_ip6,
&action0, &acl_pos_p0,
&acl_match_p0,
&rule_match_p0,
&trace_bitmap0);
if (action0 > 0)
{
vnet_buffer2 (b0)->gbp.flags |= VXLAN_GBP_GPFLAGS_A;
gu = gbp_rule_get (gc0->gc_rules[rule_match_p0]);
action0 = gu->gu_action;
switch (gu->gu_action)
{
case GBP_RULE_PERMIT:
next0 = gpd0->gpd_dpo.dpoi_next_node;
break;
case GBP_RULE_DENY:
next0 = GBP_POLICY_DROP;
break;
case GBP_RULE_REDIRECT:
next0 = gbp_rule_l3_redirect (gu, b0, is_ip6);
break;
}
}
if (next0 == GBP_POLICY_DROP)
{
vlib_increment_combined_counter
(&gbp_contract_drop_counters,
thread_index,
gci0, 1, vlib_buffer_length_in_chain (vm, b0));
b0->error =
node->errors[GBP_POLICY_DPO_ERROR_DROP_CONTRACT];
}
else
{
vlib_increment_combined_counter
(&gbp_contract_permit_counters,
thread_index,
gci0, 1, vlib_buffer_length_in_chain (vm, b0));
}
}
else
{
b0->error =
node->errors[GBP_POLICY_DPO_ERROR_DROP_NO_CONTRACT];
}
}
}
else
{
/*
* the src EPG is not set when the packet arrives on an EPG
* uplink interface and we do not need to apply policy
*/
next0 = gpd0->gpd_dpo.dpoi_next_node;
}
trace:
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
gbp_policy_dpo_trace_t *tr;
tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->sclass = key0.gck_src;
tr->dclass = key0.gck_dst;
tr->acl_index = (gc0 ? gc0->gc_acl_index : ~0);
tr->flags = vnet_buffer2 (b0)->gbp.flags;
tr->action = action0;
}
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);
}
vlib_node_increment_counter (vm, node->node_index,
GBP_POLICY_DPO_ERROR_ALLOW_INTRA,
n_allow_intra);
vlib_node_increment_counter (vm, node->node_index,
GBP_POLICY_DPO_ERROR_ALLOW_A_BIT,
n_allow_a_bit);
vlib_node_increment_counter (vm, node->node_index,
GBP_POLICY_DPO_ERROR_ALLOW_SCLASS_1,
n_allow_sclass_1);
return from_frame->n_vectors;
}
static u8 *
format_gbp_policy_dpo_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 *);
gbp_policy_dpo_trace_t *t = va_arg (*args, gbp_policy_dpo_trace_t *);
s = format (s, " sclass:%d dclass:%d acl-index:%d flags:%U action:%d",
t->sclass, t->dclass, t->acl_index,
format_vxlan_gbp_header_gpflags, t->flags, t->action);
return s;
}
VLIB_NODE_FN (ip4_gbp_policy_dpo_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return (gbp_policy_dpo_inline (vm, node, from_frame, 0));
}
VLIB_NODE_FN (ip6_gbp_policy_dpo_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
return (gbp_policy_dpo_inline (vm, node, from_frame, 1));
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_gbp_policy_dpo_node) = {
.name = "ip4-gbp-policy-dpo",
.vector_size = sizeof (u32),
.format_trace = format_gbp_policy_dpo_trace,
.n_errors = ARRAY_LEN(gbp_policy_dpo_error_strings),
.error_strings = gbp_policy_dpo_error_strings,
.n_next_nodes = GBP_POLICY_N_NEXT,
.next_nodes =
{
[GBP_POLICY_DROP] = "ip4-drop",
}
};
VLIB_REGISTER_NODE (ip6_gbp_policy_dpo_node) = {
.name = "ip6-gbp-policy-dpo",
.vector_size = sizeof (u32),
.format_trace = format_gbp_policy_dpo_trace,
.n_errors = ARRAY_LEN(gbp_policy_dpo_error_strings),
.error_strings = gbp_policy_dpo_error_strings,
.n_next_nodes = GBP_POLICY_N_NEXT,
.next_nodes =
{
[GBP_POLICY_DROP] = "ip6-drop",
}
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
