--- /dev/null
+/*
+ * 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 <plugins/gbp/gbp.h>
+#include <plugins/gbp/gbp_policy_dpo.h>
+
+#include <vnet/vxlan-gbp/vxlan_gbp_packet.h>
+
+#define foreach_gbp_policy \
+ _(DENY, "deny")
+
+typedef enum
+{
+#define _(sym,str) GBP_ERROR_##sym,
+ foreach_gbp_policy
+#undef _
+ GBP_POLICY_N_ERROR,
+} gbp_policy_error_t;
+
+static char *gbp_policy_error_strings[] = {
+#define _(sym,string) string,
+ foreach_gbp_policy
+#undef _
+};
+
+typedef enum
+{
+#define _(sym,str) GBP_POLICY_NEXT_##sym,
+ foreach_gbp_policy
+#undef _
+ GBP_POLICY_N_NEXT,
+} gbp_policy_next_t;
+
+/**
+ * per-packet trace data
+ */
+typedef struct gbp_policy_trace_t_
+{
+ /* per-pkt trace data */
+ u32 src_epg;
+ u32 dst_epg;
+ u32 acl_index;
+ u32 allowed;
+} gbp_policy_trace_t;
+
+always_inline dpo_proto_t
+ethertype_to_dpo_proto (u16 etype)
+{
+ etype = clib_net_to_host_u16 (etype);
+
+ switch (etype)
+ {
+ case ETHERNET_TYPE_IP4:
+ return (DPO_PROTO_IP4);
+ case ETHERNET_TYPE_IP6:
+ return (DPO_PROTO_IP6);
+ }
+
+ return (DPO_PROTO_NONE);
+}
+
+always_inline u32
+gbp_rule_l2_redirect (const gbp_rule_t * gu, vlib_buffer_t * b0)
+{
+ const ethernet_header_t *eth0;
+ const dpo_id_t *dpo;
+ dpo_proto_t dproto;
+
+ eth0 = vlib_buffer_get_current (b0);
+ /* pop the ethernet header to prepare for L3 rewrite */
+ vlib_buffer_advance (b0, vnet_buffer (b0)->l2.l2_len);
+
+ dproto = ethertype_to_dpo_proto (eth0->type);
+ dpo = &gu->gu_dpo[GBP_POLICY_NODE_L2][dproto];
+
+ /* save the LB index for the next node and reset the IP flow hash
+ * so it's recalculated */
+ vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo->dpoi_index;
+ vnet_buffer (b0)->ip.flow_hash = 0;
+
+ return (dpo->dpoi_next_node);
+}
+
+always_inline u8
+gbp_policy_is_ethertype_allowed (const gbp_contract_t * gc0, u16 ethertype)
+{
+ u16 *et;
+
+ vec_foreach (et, gc0->gc_allowed_ethertypes)
+ {
+ if (*et == ethertype)
+ return (1);
+ }
+ return (0);
+}
+
+static uword
+gbp_policy_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, u8 is_port_based)
+{
+ gbp_main_t *gm = &gbp_main;
+ gbp_policy_main_t *gpm = &gbp_policy_main;
+ u32 n_left_from, *from, *to_next;
+ u32 next_index;
+
+ next_index = 0;
+ n_left_from = frame->n_vectors;
+ from = vlib_frame_vector_args (frame);
+
+ 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 ethernet_header_t *h0;
+ const gbp_endpoint_t *ge0;
+ const gbp_contract_t *gc0;
+ gbp_policy_next_t next0;
+ gbp_contract_key_t key0;
+ u32 bi0, sw_if_index0;
+ vlib_buffer_t *b0;
+ index_t gci0;
+
+ gc0 = NULL;
+ next0 = GBP_POLICY_NEXT_DENY;
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ h0 = vlib_buffer_get_current (b0);
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
+
+ /*
+ * If the A0bit is set then policy has already been applied
+ * and we skip enforcement here.
+ */
+ if (vnet_buffer2 (b0)->gbp.flags & VXLAN_GBP_GPFLAGS_A)
+ {
+ next0 = vnet_l2_feature_next (b0,
+ gpm->l2_output_feat_next
+ [is_port_based],
+ (is_port_based ?
+ L2OUTPUT_FEAT_GBP_POLICY_PORT :
+ L2OUTPUT_FEAT_GBP_POLICY_MAC));
+ key0.as_u32 = ~0;
+ goto trace;
+ }
+ /*
+ * determine the src and dst EPG
+ */
+ if (is_port_based)
+ ge0 = gbp_endpoint_find_itf (sw_if_index0);
+ else
+ ge0 = gbp_endpoint_find_mac (h0->dst_address,
+ vnet_buffer (b0)->l2.bd_index);
+
+ if (NULL != ge0)
+ key0.gck_dst = ge0->ge_fwd.gef_epg_id;
+ else
+ /* If you cannot determine the destination EP then drop */
+ goto trace;
+
+ key0.gck_src = vnet_buffer2 (b0)->gbp.src_epg;
+
+ if (EPG_INVALID != key0.gck_src)
+ {
+ if (PREDICT_FALSE (key0.gck_src == key0.gck_dst))
+ {
+ /*
+ * intra-epg allowed
+ */
+ next0 =
+ vnet_l2_feature_next (b0,
+ gpm->l2_output_feat_next
+ [is_port_based],
+ (is_port_based ?
+ L2OUTPUT_FEAT_GBP_POLICY_PORT :
+ L2OUTPUT_FEAT_GBP_POLICY_MAC));
+ vnet_buffer2 (b0)->gbp.flags |= VXLAN_GBP_GPFLAGS_A;
+ }
+ else
+ {
+ gci0 = gbp_contract_find (&key0);
+
+ if (INDEX_INVALID != gci0)
+ {
+ u32 rule_match_p0, trace_bitmap0;
+ fa_5tuple_opaque_t pkt_5tuple0;
+ u32 acl_pos_p0, acl_match_p0;
+ u8 is_ip60, l2_len0, action0;
+ const gbp_rule_t *gu;
+ u16 ether_type0;
+ const u8 *h0;
+
+ action0 = 0;
+ gc0 = gbp_contract_get (gci0);
+ l2_len0 = vnet_buffer (b0)->l2.l2_len;
+ h0 = vlib_buffer_get_current (b0);
+
+ ether_type0 = *(u16 *) (h0 + l2_len0 - 2);
+
+ if (!gbp_policy_is_ethertype_allowed (gc0, ether_type0))
+ {
+ /*
+ * black list model so drop
+ */
+ goto trace;
+ }
+
+ if ((ether_type0 ==
+ clib_net_to_host_u16 (ETHERNET_TYPE_IP6))
+ || (ether_type0 ==
+ clib_net_to_host_u16 (ETHERNET_TYPE_IP4)))
+ {
+ is_ip60 =
+ (ether_type0 ==
+ clib_net_to_host_u16 (ETHERNET_TYPE_IP6)) ? 1 :
+ 0;
+ /*
+ * tests against the ACL
+ */
+ acl_plugin_fill_5tuple_inline (gm->
+ acl_plugin.p_acl_main,
+ gc0->gc_lc_index, b0,
+ is_ip60,
+ /* is_input */ 0,
+ /* is_l2_path */ 1,
+ &pkt_5tuple0);
+ acl_plugin_match_5tuple_inline (gm->
+ acl_plugin.p_acl_main,
+ gc0->gc_lc_index,
+ &pkt_5tuple0,
+ is_ip60, &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]);
+
+ switch (gu->gu_action)
+ {
+ case GBP_RULE_PERMIT:
+ next0 = vnet_l2_feature_next
+ (b0,
+ gpm->l2_output_feat_next
+ [is_port_based],
+ (is_port_based ?
+ L2OUTPUT_FEAT_GBP_POLICY_PORT :
+ L2OUTPUT_FEAT_GBP_POLICY_MAC));
+ break;
+ case GBP_RULE_DENY:
+ next0 = 0;
+ break;
+ case GBP_RULE_REDIRECT:
+ next0 = gbp_rule_l2_redirect (gu, b0);
+ break;
+ }
+ }
+ }
+ }
+ }
+ }
+ 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 =
+ vnet_l2_feature_next (b0,
+ gpm->l2_output_feat_next[is_port_based],
+ (is_port_based ?
+ L2OUTPUT_FEAT_GBP_POLICY_PORT :
+ L2OUTPUT_FEAT_GBP_POLICY_MAC));
+ }
+
+ trace:
+ if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ gbp_policy_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->src_epg = key0.gck_src;
+ t->dst_epg = key0.gck_dst;
+ t->acl_index = (gc0 ? gc0->gc_acl_index : ~0),
+ t->allowed = (next0 != GBP_POLICY_NEXT_DENY);
+ }
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ 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);
+ }
+
+ return frame->n_vectors;
+}
+
+VLIB_NODE_FN (gbp_policy_port_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (gbp_policy_inline (vm, node, frame, 1));
+}
+
+VLIB_NODE_FN (gbp_policy_mac_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (gbp_policy_inline (vm, node, frame, 0));
+}
+
+/* packet trace format function */
+static u8 *
+format_gbp_policy_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_trace_t *t = va_arg (*args, gbp_policy_trace_t *);
+
+ s =
+ format (s, "src:%d, dst:%d, acl:%d allowed:%d",
+ t->src_epg, t->dst_epg, t->acl_index, t->allowed);
+
+ return s;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (gbp_policy_port_node) = {
+ .name = "gbp-policy-port",
+ .vector_size = sizeof (u32),
+ .format_trace = format_gbp_policy_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(gbp_policy_error_strings),
+ .error_strings = gbp_policy_error_strings,
+
+ .n_next_nodes = GBP_POLICY_N_NEXT,
+
+ .next_nodes = {
+ [GBP_POLICY_NEXT_DENY] = "error-drop",
+ },
+};
+
+VLIB_REGISTER_NODE (gbp_policy_mac_node) = {
+ .name = "gbp-policy-mac",
+ .vector_size = sizeof (u32),
+ .format_trace = format_gbp_policy_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .sibling_of = "gbp-policy-port",
+};
+
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
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